TBM50-200-8LA [NEC]
Piezoelectric Ceramics; 压电陶瓷
| 型号： | TBM50-200-8LA |
| 厂家： | 
NEC |
| 描述： | Piezoelectric Ceramics |
| 文件： | 总31页 (文件大小：411K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
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2010.03.19 9307PIEVOL04E
CONTENTS
References
3
4
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Design Materials
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
NEPEC NPM Ceramics
9
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Applications
15
16
19
20
26
27
28
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Langevin Bolt-On Transducers
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Transducers for Cleaning Equipment
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Molded Waterproof Transducers
High-Frequency Transducers
Aerial Microphone Transducers
Sonar Transducers
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
INTRODUCTION
Increasingly, we can see the unique properties of mechanical vibration and ultrasonic waves put to use in many ways. And the
single most important key to the effective monitoring or use of vibration is the transducer. Today's transducers are called on for
standards of performance that are higher than
ever before.
For best results in any application, the piezoelectric materials in the transducer should be selected with the specific use in
mind. This catalog contains a wealth
of information to help you evaluate transducer characteristics.
And when it comes to the materials themselves, look to NEC TOKIN's NEPEC® NPM piezoelectric ceramics. Using zicron
and lead titanate as the main components, NEPEC materials have a wealth of features:
1) A wide selection range, especially for mechanical
characteristics and degree of electromechanical coupling.
2) High stability against temperature and humidity variations
and aging.
3) Remarkably fine ceramics that can be machined into a
variety of sizes and shapes.
4) Excellent resistance to voltage, permitting transducers
with polarization in any direction.
5) A wide range of potential uses.
This catalog describes NEC TOKIN's standard piezoelectric ceramics, and it also describes NEC TOKIN's line of transducers.
If you cannot find the desired material characteristics or transducer for your application in these pages, please contact us
directly; our engineering staff can work with you to develop materials for your purpose.
References
Please refer to the following bibliography if you want more details of basic theory and applications of transducers:
1) Ultrasonic technology handbook (J. Tomoyoshi et al, Nikkan Kogyo Shinbun)
2) Ceramic dielectrics (K. Okazaki, Gakkensha)
3) Physical Acaustic Vol I Part A (Mason, Academic Bress)
4) Piezoelectric ceramic materials (T.Tanaka, Denpa Shinbun)
5) Piezoelectric ceramics and their applications (Electronic materials Association, Denpa Shinbun)
6) New ultrasonic wave technologies (E. Mori, Nikkan Kogyo Shinbun)
7) Ultrasonic engineering (H. Wada, Nikkan Kogyo Shinbun)
8) Ultrasonic circuit (S. Ishiwata, Nikkan Kogyo)
9) Ultrasonics in medicine (compiled by The Japan Society of Ultrasonics in Medicine, Igaku Shoin)
10) Simple applications of ultrasonics (S. Fujimori, Sanpo)
11) Electromechanical functional parts (compiled by Specialized Committee of The Institute of Electrical Engineers of Japan)
12) Test methods for piezoelectric ceramic transducers (EMAS-6001 to EMAS-6004)
(Piezoelectric Ceramic Engineering Committee, Electronic Materials Association)
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Design Materials
Outline
A piezoelectric material responds mechanically when
voltage is applied, and conversely, generates a voltage in
response to a mechanical change.
piezoelectric effect (such as igniters and pickups), those
that utilize resonance (e.g., filters), and those that utilize
the electrostrictive effect (such as piezoelectric buzzers
and displacement elements).
In addition to barium titanate and lead zircotitanate,
popular as piezoelectric ceramics, NEC TOKIN offers multi-
component solid ceramics developed from conventional
lead zircotitanate ceramics. They meet a wide range of
specifications for a wide range of applications. The main
applications include: those that use the piezoelectric
effect (such as sensors and pickups), those that utilize
resonance (such as transducers for ultrasonic motors and
cleaning equipments), and those that utilize the
To create piezoelectric ceramics, polycrystalline
ceramics are fired and baked at a high temperature. Then
electrodes are mounted and a DC field applied in order to
polarize the ceramic material; once polarized, the
material exhibits piezoelectric properties, allowing it to
be used as a piezoelectric ceramic transducer. These
transducers are also called electrostriction transducers,
since ceramic crystals are deformed by electricity.
Barium titanate and lead zircotitanate are the most
popular piezoelectric ceramics. In addition, NEC TOKIN
also uses a variety of other materials, including
conventional lead zircotitanate.
electrostrictive effect (such as piezoelectric sound
elements and displacement elements). In addition, they
can be used as ultrasonic vibrators and transducers.
This results in piezoelectric materials that can be used
in a wide variety of applications: those that use the
4
Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Evaluation of Transducer Characteristics
NEC TOKIN evaluates the characteristics of
transducer materials based on a number of parameters.
Practically, frequencies minimizing and maximizing
the impedance shown in Fig. 2 are generally treated as
fr and fa, respectively.
1) Resonant Frequency
When an AC voltage is applied to the transducer and
frequency f is varied to be in agreement with the
natural frequency of the transducer, it vibrates very
violently. This frequency is called resonance
frequency fr.
A constant voltage circuit or a low voltage circuit
was used for measurement of the resonance and anti-
resonance frequencies. Recently. these frequencies
can be measured easily with an impedance analyzer
such as the HP4194A of Hewlett-Packard.
Resonance frequency fr obtained from the
equivalent circuit near the resonance frequency and
anti-resonance frequency fa can be expressed by the
following equations:
fr
fa
Frequency (Hz)
Fig. 1-2 Impedance characteristic of piezoelectric transducer
L1
C1
R1
Resonant frequency fr can be defined in a number
of different ways, depending on the mechanical
structure and oscillation of the transducer.
a) Radial vibration
C0
Fig. 1-1 Equivalent circuit of transducer
N
fr = 1 Hz · · · · · · · · · · (1)
[
]
D
fr = 1/ 2
π L C
1 1
{
}
t
fa=1/ 2
π L C C / C + C
(
)
}
{
1
0
1
1
0
D
D>3t
Fig. 1-3
Radial vibration is in the direction of the arrows. The
coefficient of electromechanical coupling for this type
of vibration us called Kr.
Piezoelectric Ceramics Vol.04
5
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
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2010.03.19 9307PIEVOL04E
b) Lengthwise vibration
e) Shear vibration
N2
N5
t
fr =
Hz
· · · · · · · · · · (2)
[
]
· · · · · · · · · · (5)
Hz
fr =
[
]
t
t
>4a
a>t
Fig. 1-7
Fig. 1-4
The direction of vibration is the same as the
The direction of vibration is perpendicular to the
polarization direction; it is a simple vibration in one
plane only. The coefficient of electromechanical
polarization direction. Orientation of the drive field
direction is perpendicular to it. A drive electrode is
located perpendicular to the direction of polarization.
The electromechanical coupling coefficient is
coupling is known as K31
.
expressed by K15
.
Where
N
N
1
: Frequency constant of radial vibration (Hz-m)
: Frequency constant of lengthwise vibration
(Hz-m)
: Frequency constant of longitudinal vibration
(Hz-m)
: Frequency constant of thickness vibration
(Hz-m)
: Frequency constant shear vibration (Hz-m)
c) Longitudinal vibration
2
N3
l
N
N
N
3
4
5
fr =
Hz
· · · · · · · · · · (3)
[
]
D
a
D : Diameter of disc or column (m)
: Length of plate, column, or cylinder (m)
a,b: Width of square plate or column (Hz-m)
t
: Thickness of disc, square plate, or cylinder (m)
>3(a,b,D)
Fig. 1-5
2) Coefficient of electromechanical coupling
The coefficient of electromechanical coupling repre-
sents the mechanical energy accumulated in a ceramic
or crystal; it is related to the total electrical input. This
coefficient k can be calculated for each individual
vibration mode by using the resonant (fr or fm) and
antiresonant frequencies (fa or fn) and the applicable
formula shown here:
The directions of polarization and vibration are the
same, vibration is simple vibration. The electro-
mechanical coupling coefficient is known as K33
.
d) Thickness vibration
N4
t
fr =
Hz · · · · · · · · · · (4)
[
]
fa − fr
fr
⎛
⎝
⎞
⎠
b
· · · · · · · · · · · · · · · · · · · · · (6)
Kr= 2.51
t
t
r
· · · · · · · · · · · · · · · · · · · · · · · · · (7)
=
K31
D
r − tanr
t
3(a,b,D)
π fa
2 fr
Fig. 1-6
r =
⋅
Here, thickness is small compared with the area of the
radiation plane; the effect of vibration is the same as
that of longitudinal vibration. Generally, vibration is in
two directions, and discrimination can be made
between the two. The electromechanical coupling
coefficient for this type of vibration is called Kt.
6
Piezoelectric Ceramics Vol.04
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●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
4) Young's modulus
π fr
⋅
π
⎝
2
fr
fa
⎛
⎝
⎞
⎠
⎛
⎞
⎠
· · · · · · · · · · · · · · · · (8)
· · · · · · · · · · · · · · · · (9)
· · · · · · · · · · · · · · · (10)
=
cot
⋅
K33
2 fa
For different modes of vibration, Young's modulus is
calculated by Eq. 12, based on the sonic velocity and
density of the material.
π fr
⋅
π
2
fr
fa
⎛
⎝
⎞
⎠
⎛
⎝
⎞
⎠
Kt=
cot
⋅
2 fa
YE = ρν2 N/m2 · · · · · · · · · · · · · · · · · · · · · · (12)
[
]
π fr
⋅
π
fr
fa
⎛
⎝
⎞
⎠
⎛
⎞
⎠
=
cot
⋅
K15
Where ρ: Density (kg/m3)
⎝
2 fa
2
ν(=2fr ): Sonic velocity (m/sec.)
N: Newton
Where
Kr : Electromechanical coupling coefficient for radial
vibration
31: Electromechanical coupling coefficient for
lengthwise vibration
33: Electromechanical coupling coefficient for
longitudinal vibration
Kt : Electromechanical coupling coefficient for thick-
ness vibration
5) Mechanical Q
K
The mechanical Q is the "sharpness' of mechanical
vibration at resonant frequency, and is calculated with
Eq 13.
K
fa2
Qm =
· · · · · · · · · · · · (13)
2πfr Zr C(fa2 − fr2)
K
15: Electromechanical coupling coefficient for shear
vibration
Where fr : Resonant frequency (Hz)
fa : Antiresonant frequency (Hz)
Zr : Resonant resistance (Ω)
fr : Resonant frequency [Hz]
fa : Antiresonant frequency [Hz]
C : Static capacitance (F)
3) Relative dielectric constant
Where a simpler method is called for, mechanical Q
may be calculated with Eq. 14, using frequencies f
1
When the electric flux density caused by applying an
electric field E between electrodes of a transducer
under a constant stress is regarded as D, the relative
dielectric constant is obtained by dividing the constant,
and f which are each 3 dB from the resonant frequency.
2
fr
− f
Qm =
· · · · · · · · · · · · · · · · · · · · · · · · · · (14)
f1
2
T
defined by D/E=ε , by the vacuum dielectric constant
The values shown for material characteristics in this
catalog are calculated using Eq. 13.
ε
0
. This relative dielectric constant is expressed by
/ε0when the direction of polarization and applied
T
ε
33
electric field are the same; it is expressed by
ε
T
11
/ε0 when these directions are perpendicular.
6) Piezoelectric constant
Calculation of relative dielectric constant is shown in
Eq. 11. Static capacitance is usually measured at 1kHz
using an all-purpose bridge or a C meter.
There are two types of piezoelectric constants, the
piezoelectric strain constant and the coefficient of
voltage output.
tC
ε0S
ε3T3 /ε
0
=
· · · · · · · · · · · · · · · · · · · · · · · · · · · (11)
a) PiezoeIectric strain constant
T
This is a measure of the strain that occurs when a
specified electric field is applied to a material that is in
the condition of zero stress. This constant is calculated
with Eq. 15.
(ε 11/ε
0
is also calculated using the same equation.)
Where
ε
0
: Relative dielectric constant in vacuum
(8.854x10-12 F/m)
t
S
: Distance between electrodes (m)
: Electrode area (m2)
εT
· · · · · · · · · · · · · · · · · · · · · · · (15)
m/V
d = k
(
)
YE
C : Static capacitance (F)
Where k : Coefficient of electromechanical coupling
T
ε
: Dielectric constant
YE: Young's modulus (Newton/m2)
E
P
E
P
ε3T3 /ε
0
ε1T1 /ε
0
Fig.1-8
Piezoelectric Ceramics Vol.04
7
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
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2010.03.19 9307PIEVOL04E
9) Aging rate
b) VoItage output constant
This is the intensity of the electric field caused when
a specified amount of stress is applied to a material
that is in the condition of zero displacement. Voltage
output constant is calculated with Eq. 16.
The aging rate is an index of the change in resonant
frequency and static capacitance with age. To
calculate this rate, after polarization the electrodes of a
transducer are shorted together, and are heated for a
specified period of time. Measurements are taken of
the resonant frequency and static capacity every 2n
days. (That is, at 1, 2, 4, and 8 days.) The aging rate
is calculated with Eq. 19.
d
ε
g = V ⋅m/N · · · · · · · · · · · · · · · · · · · · · · · · (16)
(
)
Constants d and constants g can be d31,d33, or d15
,
and g31, g33, or g15, depending on the type of vibration.
1
Xt
2
− Xt
1
· · · · · · · · · · · · (19)
(AR) =
⋅
logt
2
− logt
1
Xt1
7) Curie temperature
Where (AR): Aging rate for resonant frequency or
static capacitance
This is the temperature at which polarization
disappears and the piezoelectric qualities are lost. It is
also the temperature at which the value of the
dielectric constant becomes maximum.
t
1 2 : Number of days aged after polarization
t1,Xt2 : Resonant frequency or static
,t
X
capacitance at t
1 and t2 days after
polarization
8) Temperature coefficient
10) Density
The temperature coefficient is a measure of the
variation of the resonant frequency and static
capacitance with change in temperature. Temperature
coefficient is calculated with Eqs. 17 and 18.
The density is calculated with Eq. 20, after
determining the volume and weight of the specified
ceramic material.
W
V
D =
kg/m3
· · · · · · · · · · · · · · · · · · · · · · · · · (20)
1
Δt
f(t1
) − f(t2)
f20
(
)
· · · · (17)
TK(f) =
⋅
× 106(PPm/°C)
Where W : Weight (kg) of ceramic material
1
Δt
C(t
1
) − C(t
2)
× 106(PPm/°C)
V : Volume (m3) of material
TK(C) =
⋅
· · (18)
C20
Where TK(f) : Temperature coefficient of resonant
frequency (PPm/˚C
) : Resonant frequency at temperature
˚C(Hz)
) : Resonant frequency at temperature
˚C(Hz)
)
f (t
1
2
t1
f (t
t2
f
20
: Resonant frequency at temperature
20˚C(Hz)
TK(C) : Temperature coefficient of static
capacitance (PPm/˚C
): Static capacitance (F) at temperature
˚C
): Static capacitance (F) at temperature
˚C
C20 : Static capacitance at 20˚C(F)
Δt : Temperature difference (t2– ) (˚C
)
C (t
1
2
t1
C (t
t2
t
1
)
8
Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
NEPEC® NPM Ceramics
Characteristics of Standard Materials
Table 1-1 shows the material characteristics of NEC
TOKIN's standard NEPEC® NPM ceramic materials.
Notes
1. Frequency constants;
N1 : Radial frequency constant (fr×D)
N2 : Lengthwise frequency constant (fr× )
N3 : Longitudial frequency constant (fa× )
N4 : Thickness frequency constant (fa× )
N5 : Shear frequency constant (fa× )
2. The temperature and aging characteristics shown are
values of radial vibration for a sample of 17.7φ×1.0t
(mm) in size.
3. The values of Kr (electromechanical coupling
coefficient) shown in parentheses are approximate
values. All others are exact.
Piezoelectric Ceramics Vol.04
9
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Table 1-1. Characteristics of Standard NEPEC® NPM Materials
Material
Characteristics
Unit
N-61
N-8
N-10
N-21
N-6
T
1400
1400
1100
5440
1800
ε33
/
ε0
ε0
Relative
dielectric
constant
T
1350
0.3
1300
0.3
1400
0.4
ε
11
/
5000
2.0
2000
2.0
tanδ (%)
Loss factor
N1
N2
N3
N4
N5
[Radial]
(Hz-m)
(Hz-m)
(Hz-m)
(Hz-m)
(Hz-m)
2160
1600
1510
1960
970
2160
1570
1490
2010
1170
2240
1670
1520
2000
920
2040
1410
1370
1800
1110
1960
1410
1310
1940
860
[Lengthwise]
[Longitudinal]
[Thickness]
[Shear]
Frequency
constant
(0.65)
0.55
(0.67)
0.56
(0.67)
0.56
(0.57)
0.50
(0.78)
0.62
Kr [Radial]
K
31 [Transverse]
33 [Logitudinal]
0.34
0.68
0.55
0.71
12.7
15.4
7.9
0.33
0.67
0.52
0.66
13.1
15.6
7.6
0.34
0.67
0.52
0.78
11.2
15.2
8.9
0.34
0.68
0.62
0.66
14.8
18.1
6.8
0.38
0.73
0.52
0.77
16.5
19.9
6.1
Electro-
mechanical
coupling
constant
K
Kt [Thickness]
15 [Shear]
K
SE11 (× 10-12m2/N)
SE33 (× 10-12m2/N)
YE11 (× 1010N/m2)
YE33 (× 1010N/m2)
Elastic
constant
6.5
6.4
6.6
5.5
5.0
-133
302
419
-10.4
23.5
45.1
0.32
300
300
1800
2300
0.4
-132
296
464
-10.7
23.8
39.4
0.31
600
400
700
3000
0.4
-99
-287
635
930
-6.0
13.2
21.0
0.34
200
900
3800
3500
0.5
-198
417
d
d
d
g
g
g
δ
31 (× 10-12m/V)
33 (× 10-12m/V)
15 (× 10-12m/V)
31 (× 10-3Vm/N)
33 (× 10-3Vm/N)
15 (× 10-3Vm/N)
226
652
-13.1
30.0
44.4
0.24
-250
-550
3700
3600
0.5
711
Piezo-
electric
constant
-12.1
25.4
41.0
0.34
-300
-150
3500
3000
0.1
Poisson's ratio
- 20~20°C
20~60°C
- 20~20°C
20~60°C
TK (fr)
(PPm/˚C)
Temperature
coefficient
TK (˚C)
(PPm/˚C)
fr (%/10 Years)
C (%/10 Years)
Aging rate
-2
-2
-5
-5
-5
Mechanical
quality factor
1500
1800
1600
70
75
Qm
Curie
temperature
325
315
320
145
330
Tc (˚C)
3
3
Density
D (× 10 kg/m )
7.77
7.79
7.72
8.00
7.82
(× 10-7/˚C)
(Room Temperature
~200°C)
Thermal
expansion
coefficient
30
12
11
14
29
10 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Characteristics and Main Applications by Material
Table 1-2 shows characteristics and main applications by material. Use materials that match your use.
Table 1-2. General Characteristics and Main Applications
ltem
Material
N-6
N-61
N-8
N-10
N-21
Dielectric Constant
Electromechanical Coupling Coefficient
Piezoelectric Modules
Piezoelectric Output Constant
Mechanical Quality Coefficient
Resonant Frequency Temperature Coefficient
Dielectric Constant Temperature Coefficient
Aging Characteristics
Pickups, microphones, speakers,
underwater receiving transducers,
and other acoustic equipment.
Transducers to generate ultrasonic signals, pressure
generating elements and medical equipment transducers.
Main Applications
= Particularly good value
= Good value
= Lower value
Materials for actuators
High-power piezoelectric Materials
Actuator materials not listed in the catalog exemplified
here. Please contact us for further details.
The vibration energy of the piezoelectric transducer is
in proportion to the square of the transducer tip end
vibration speed.
There are high-power materials not listed in the catalog
that do not generate heat at high vibration velocities.
Please contact us for details.
350
New series
300
N10
1
P = Mv2
Vibration energy
250
2
M : Equivalent mass
v : Transducer tip end vibration speed
200
N21
150
100
150
200
Tc/˚C
250
300
350
30
N-8
25
20
New material
15
10
5
0
0
0.2
0.4
0.6
0.8
1.0
Transducer tip-end vibration speed (m/s)
Piezoelectric Ceramics Vol.04 11
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Terminal Layout
The three types of terminal layout are shown in Table 1-3 for the disc and cylindrical shapes.
Layout of terminals for the column, square plate, and square column shapes are the same as right. For inquiries
about special terminal configurations,
Table 1-3
Terminals
P-terminal
S-terminal
O-terminal
Disc
Cylinder
Terminals (solder dots) provided on
positive and negative electrode surfaces.
Negative electrode terminal is available Negative electrode terminal is available
Description
on positive electrode surface.
on side face.
External Surface
Table 1-4. Types of External Coating
NEC TOKIN transducers are coated for protection, for
uniformity of the electromechanical interface, and to
ensure an attractive external view. Table 1-4 shows
the different types of surface coatings available. Select
the coating that is best for your requirements.
Coating
Surfaces
Standard
Color
Coating
Features
Synthetic resin; resists
water and oil.
Suitable for fish-finding
sonars and air excitation.
All surfaces
are coated
M Coating
Silver gray
Dark brown
(Bakelite
color)
Bakelite resin; resists
All surfaces
B Coating
solvents. Suitable for
are coated
ultrasonic cleaning.
Specification Example
(
)
(
)
(
)
Shape mm
Material
fr kHz
K
C pF
×
×
×
24
25.8
26500
19600
Cylinder
Disc
NR 38 34 30
N
N
-
-
21
21
0.25
0.25
×
36 31 30
×
6400
3000
7000
2700
5600
4600
8900
7400
6500
ND 10 0.3
N
N
N
N
N
N
N
N
-
-
-
-
-
-
-
-
21
21
8
6
6
6
6
6
0.57
0.6
0.55
0.6
0.6
0.6
×
4000
2100
54
54
43
20 0.5
×
20 1.0
×
40 2.5
×
40 3.0
×
50 2.5
×
43
36
50 3.0
0.6
0.6
×
60 5.0
×
×
100
80
100
80
48
40
98
90
7
7
13.5
16.5
×
N
N
N
N
-
-
-
-
21
21
21
21
0.65
0.65
0.65
0.65
Column
ND
NS
10 13.5
10 16.5
×
×
×
6500
5000
4000
6500
5000
4000
3000
13500
10500
14000
42000
32500
33000
28500
20 20 0.3
20 20 0.4
25 25 0.5
80 15 0.3
80 15 0.4
100 15 0.5
100 15 0.6
N
N
N
N
N
N
N
-
-
-
-
-
-
-
21
21
21
21
21
21
21
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Square Plate
×
×
×
×
×
×
×
×
×
×
×
×
12 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Selected Material Characteristics
a) Temperature characteristics
b) Aging characteristics
Sample: Disc (17.7mmφ × 1mm t)
Sample: Disc (17.7mm φ × 1mm t)
150
150
140
130
120
110
140
130
N-8
N-8
N-61
N-6
N-61
N-6
120
110
N-10
N-21
N-21
-20
0
20
40
60
4
6 8
2
4
6 8 100
2
4
6 8
1000
10
Temp (°C)
Days
Fig.1-9. Variation in Resonant Frequency
with Temperature
Fig.1-12. Variation in Resonant Frequency
with Aging
Sample: Disc (17.7mm φ × 1mm t)
Sample: Disc (17.7mm φ × 1mm t)
0.80
0.70
0.60
0.80
0.70
0.60
N-21
N-10
N-21
N-6
N-61
N-6
N-61
N-8
0.50
0.40
0.30
0.50
0.40
0.30
-20
0
20
40
60
4
6 8
2
4
6 8 100
Days
2
4
6 8
1000
10
Temp (°C)
Fig.1-10. Variation in Electromechanical Coupling
Coefficient with Temperature
Fig.1-13. Variation in Electromechanical Coupling
Coefficient with Aging
Sample: Disc (17.7mm φ × 1mm t)
Sample: Disc (17.7mm φ × 1mm t)
13000
11000
9000
3600
3200
N-10
N-21
N-6
N-61
2800
2400
2000
1600
1200
7000
5000
3000
N-21
N-6
N-61
N-8
N-1
N-8
1000
-20
0
20
40
60
4
6 8
2
4
6 8 100
2
4
6 8
1000
10
Temp (°C)
Days
Fig.1-11. Variation in Static Capacitance
with Temperature
Fig.1-14. Variation in Static Capacitance with Aging
Piezoelectric Ceramics Vol.04 13
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
c) Thermal aging characteristics
d) Characteristics of high-voltage aging
Test Conditions
φ
φ
Sample: Ring (60mm × 45mm × 16mm t)
Material: N-6 Applied Voltage: 2,000V (in air)
Frequency: 5.5kHz Duration: 10 min.
φ
Sample: Disc (17.7mm × 1mm t)
Conditions of Burn-in 200°C × 1h
150
140
130
21
20
19
0.37
0.36
N-6
120
110
0.35
0.34
1100
1000
N-21
100
900
800
90
1
2
4
6
8
2
4 6 8
100
1
2
4
6 8
Days
2
4 6 8
100
10
(Before Test)
10
(Before Test)
Hours
Fig.1-15. Variation in Resonant Frequency
with Thermal Aging
Fig.1-18. Variation in Dielectric Strength (Test 1)
Test Conditions
Sample: Ring (40mm
Material: N-6
φ
× 3mm t)
Sample: Disc (17.7mm
Conditions of Burn-in 200°C × 1h
φ
× 1mm t)
Applied Voltage: 2,800V (rms)
Pluse Width: 100m sec.
0.80
0.70
Pluse Interval: 1sec. Duration: 10min.
58
57
N-21
N-6
0.60
0.50
0.40
56
0.58
0.57
0.56
0.55
5000
4900
4800
4700
0.30
(Before Test)
1
2
4
6 8
Days
2
4 6 8
100
10
1
2
4
6
8
2
4 6 8
100
10
(Before Test)
Hours
Fig.1-16. Variation in Electromechanical Coupling
Coefficient with Thermal Aging
Fig.1-19. Variation in Dielectric Strength (Test 2)
Test Conditions
φ
Sample: Disc (17.7mm × 1mm t)
φ
φ
Sample: Ring (51.4mm × 44.8mm × 3.67mm t)
Material: N-6 Applied Voltage: 1,000V(50Hz AC)
Duration: 1min.
Conditions of Burn-in 200°C × 1h
4000
3500
3000
2500
N-21
N-6
220
210
200
0.33
0.32
2000
1500
0.31
0.31
20300
20200
1000
(Before Test)
20100
20000
1
2
4
6 8
Days
2
4 6 8
100
10
1
2
4
6
8
2
4 6 8
100
10
(Before Test)
Hours
Fig.1-17. Variation in Static Capacitance
with Thermal Aging
Fig.1-20. Variation in Dielectric Strength (Test 3)
14 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Applications
The job of a transducer is to convert electrical energy
into mechanical energy, and vice versa. And
transducers using NEC TOKIN piezoelectric ceramics
are uniquely suited to performing this job in a wide
variety of applications. To help classify transducers,
we divide their applications into two general areas:
1) conversion of electrical energy into mechanical
energy for hydraulic or motive power, and 2)
converting mechanical into electrical energy for
communications and electronics.
Mechanical
power
16
19
20
26
27
28
Langevin Bolt-On Transducers
· · · · · · · · · · · · · · · · · · ·
applications
Transducers for Cleaning Equipment
· · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · ·
Piezoelectric Ceramics
Molded Waterproof Transducers
High-Frequency Transducers
Aerial Microphone Transducers
<NPM>
· · · · · · · · · · · · · · · · · · · ·
Electrical and
communications
· · · · · · · · · · · · · · · · · ·
Sonar Transducers
· · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Piezoelectric Ceramics Vol.04 15
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Langevin Bolt-on Transducers
Outline
NEC TOKIN's Langevin-type transducers are used where
powerful ultrasonic waves must be generated, such as
in cleaning equipment, ultrasonic treatment machines,
and welders for plastic. For application flexibility and
ease of installation, these transducers are mounted in
a structure that can be bolted almost anywhere.
NEC TOKIN's high-performance NEPEC® N-61 is
excellent for use in these Langevin transducers. NEC
TOKIN produces a number of this type of transducer,
all featuring high quality and excellent output levels,
and all based on a unique NEC TOKIN design.
Features
Markings
Product models are classified as shown in the example
here:
• High mechanical Q and excellent electro-acoustic
conversion efficiency, providing a high output
amplitude.
NBL 45 28 2 H
• Piezoelectric element offers a high speed of
vibration
• N-61 ceramics have extended temperature range,
ensuring good amplitude linearity.
• Bolt-on mounting gives fast, easy installation and
high reliability.
H = Horn construction; output
surface has step or horn
shape.
S = Straight construction
2 = Number of piezoelectric
elements (2 elements)
28 = Resonant frequency (28kHz)
45 = Diameter of acoustic wave
radiation ( φ 45mm)
<For Cleaning Equipment>
Specifications of Standard Models
Table 2-1
Type
Item
45282H-A
28.0
40
45402H-A
40.2
15
Resonant frequency
Dynamic admittance
Mechanical Q
fo (kHz)
Yo (mS)
Qm
500
500
Static capacitance
Maximum allowable velocity
Maximum allowable power
Applications
C (pF)
4000
40
4000
50
V (cm / S)
P (W)
50
50
Cleaning Equipment
Note: Maximum allowable power is based on the data where one unit is measured with a water load on one side.
16 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Shape and Dimensions
NBL-45282H-A
NBL-45402H-A
13
8
13
27
11.5
M10.P1
11
39
11.5 19
10
11
M10.P1
53.5
79.5
Fig. 2-1
Temperature Characteristics
28.2
28.0
27.8
27.6
27.4
27.2
27.0
6000
5000
4000
3000
20
50
100
150
20
50
100
150
→
→
Temperature (°C)
Temperature (°C)
40
30
20
1 × 10 5
5 × 10 4
1 × 10 4
20
50
100
150
20
50
100
150
→
→
Temperature (°C)
Temperature (°C)
Fig. 2-2. Temperature Characteristics of NBL-45282H-A
Piezoelectric Ceramics Vol.04 17
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
<For Treatment Machines>
Specifications of Standard Models
Table 2-2
Type
Item
NBL15602S
NBL20602S
Resonant frequency
Dynamic admittance
Mechanical Q
fo (kHz)
Ymo (mS)
Qm
60
25
60
20
500
850
50
400
1250
40
Static capacitance
Maximum allowable velocity
Maximum Allowable power
Applications
C (pF)
V0-P (cm / S)
P (W)
2.5
3.7
Treatment Machines
Note) Maximum allowable input in no-load state
Shape and Dimensions
NBL15602S
NBL20602S
(40.8)
(40.4)
φ
φ
Fig. 2-3
Horn Installation Reference Example
(89.1)
(89.9)
φ
φ
φ
φ
Fig. 2-4
Vibration
No-load state
10
No-load state
7
6
Horn installation example
Horn installation example
8
6
4
2
0
5
μ
μ
4
3
2
1
NBL15602S
NBL15602S
0
0
1
2
3
4
0
1
2
3
4
5
Input Power P(W)
Input Power P(W)
Fig. 2-5
18 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Transducers for Cleaning Equipment
Outline
In the past, transducers for cleaning equipment have
been found almost exclusively in ultrasonic cleaners
for industrial and business use. Today, however, small
cleaning equipment for glasses, false teeth, gemstones,
etc. is increasingly found in individual households as
well. NEC TOKIN's transducers for cleaning
equipment utilize our N-6 material, providing
ultrasonic generators that are compact and
extraordinarily temperature-resistant.
Specification Example
Specifications
Table 2-3
Cleaning vessel
D (mm)
40
t (mm)
2.5
fr (kHz)
54
Kr
C (PF)
5600
4600
8900
7400
6500
0.60
0.60
0.60
0.60
0.60
NEC TOKIN
27-01
40
3.0
54
50
2.5
43
50
3.0
43
D
60
5.0
36
Piezoelectric transducer
fabricated from N-6
Fig. 2-6. Product Diagram
Temperature Characteristics
(fr)
(kr)
(Insulation Resistance)
58
56
54
52
0.80
0.70
0.60
0.50
106
105
104
103
0
0
0
50
100
150
200
50
100
150
200
0
50
100
150
200
Temperature (°C)
Temperature (°C)
Temperature (˚C)
Fig. 2-7. Variation in N-6 Characteristics with Temperature
Piezoelectric Ceramics Vol.04 19
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Molded Waterproof Transducers
Outline
Transducers that can withstand salt water and under-
water pressures are used to generate ultrasonic signals
for fish finders, sonar equipment, depth gauges, and
Doppler-effect velocity and current meters.
NEC TOKIN’s molded transducers are highly reliable,
even in the face of severe underwater conditions.
Completely waterproof, they offer excellent
mechanical strength and temperature characteristics,
thanks in part to their unique NEC TOKIN design and
technology. By using a variety of different materials
for our molded transducers, we can offer a large
variety of frequency, input, and directivity
characteristics.
Features
• High reliability, thanks to NEC TOKIN’s own molding
technology, including solid urethane rubber molding
and baked neoprene rubber.
• Excellent noise characteristics.
• Wide range of frequencies and molding materials
available.
Markings
Product models are classified as shown in the
following example:
T GM 60-50 A-10 LA
Cable type L: Chloroprene, LA: Vinyl
Cable length (m)
No. of transducers included A: 3, B: 2
Resonant frequency (kHz)
Transducer outside diameter (mm)
Molding material GM: Rubber molding, MM: Metal molding, BM: Plastic molding
Transducer material T: VPT, N: NPM
20 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Specifications of Standard Models
Table 2-6
Resonant Frequency
Impedance (Ω)
at Resonance
Static Capacitance
Insulation Resistance
Model
Directivity
Shape
(kHz)
(pF)
(MΩ)
40
7500
7500
8000
3400
2500
4500
2400
5500
7500
8000
2500
23000
5500
15000
12700
9000
4300
2800
2800
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
500 and over
50˚
45˚
150 ~ 400
150 ~ 400
150 ~ 350
200 ~ 600
300 ~ 800
200 ~ 400
100 ~ 400
50 ~ 200
30 ~ 100
100 ~ 300
200 ~ 400
50 ~ 150
70 ~ 150
100 ~ 300
50 ~ 200
50 ~ 200
150 ~ 400
150 ~ 350
200 ~ 450
A
A
A
A
A
A
A
A
A
B
B
E
E
D
D
D
D
C
C
TGM60-40-10L
45
TGM60-45-10L
50
44˚
TGM60-50-10L
75
36˚
TGM42-75-10L
75
20˚
TGM80-75-12L
100
12˚
TGM100-100-15L
200
11˚
TGM50-200-10L
200
7˚
TGM80-200-20L
200
6˚
TGM100-200-20L
50
44˚
TMM60-50-10LA
200
11˚
TMM50-200-10LA
50
12˚×44˚
5˚×11˚
13˚×44˚
11˚×38˚
11˚×36˚
11˚
TGM60-50A-15L
200
TGM50-200A-15L
50
TGM60-50B-12L
68
TGM46-68B-12L
75
TGM42-75B-12L
200
TGM50-200B-12L
50
60˚
NBM40-50-8LA
200
11˚
TBM50-200-8LA
Physical Characteristics
Type A
Type B
Type C
f
f
f
e
e
φa
φb
a
b
φb
Type D
Type E
f
f
Two
elements
Three
elements
a
b
a
b
Fig. 2-10. Shape and Construction
Piezoelectric Ceramics Vol.04 21
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Table 2-7
e
Dimensions
f (cable)
Shape
Model
a
b
c
d
TGM60-40-10L
TGM60-45-10L
TGM60-50-10L
TGM42-75-10L
TGM80-75-12L
TGM100-100-15L
TGM50-200-10L
TGM80-200-20L
TGM100-200-20L
TMM60-50-10LA
TMM50-200-10LA
TGM60-50A-15L
TGM50-200A-15L
TGM60-50B-12L
TGM46-68B-12L
TGM42-75B-12L
TGM50-200B-12L
NBM40-50-8LA
TBM50-200-8LA
69.5
69.5
89.5
89.5
5.0
5.0
5.0
4.0
5.0
4.0
5.0
7.0
7.0
78.0
78.0
60.0
43.0
65.0
55.0
60.0
45.0
45.0
60.0
60.0
60.0
27.0
30.0
40.0
60.0
30.0
30.0
69.5
89.5
47.8
61.0
104.0
120.0
69.5
120.0
130.0
89.0
φ
11, two-core shield captire cable (chloroprene)
A
100.0
124.0
120.0
140.0
W • 1.11d/
inch
φ
φ
80.0
100.0
226.0
56
120
7, two-core shield captire cable (vinyl)
B
E
60.0
206.0
7.0
160.0
11, two-core shield captire cable (chloroprene)
50.0
φ
φ
140.0
–
160.0
68.0
5.0
60.0
11, two-core shield captire cable (chloroprene)
5, two-core shield captire cable (vinyl)
D
C
M • 22
P1.5
31.0 120.0
22 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Typical Directivity Patterns (1)
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TGM60-50-10L
TGM60-75-10L
0
0
(dB)
10
330
30
20
30
300
60
40
50
270
90
240
120
TGM50-200-10L
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TGM60-50A-15L
TGM60-50A-15L
Fig. 2-11. Directvity
Piezoelectric Ceramics Vol.04 23
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TGM60-50B-12L
TGM60-50B-12L
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TGM60-75A-15L
TGM60-75A-15L
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TGM50-200A-15L
TGM50-200A-15L
Fig. 2-11. Directvity
24 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Typical Directivity Patterns (2)
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
TMM60-50-10LA
TBM50-200-11
0
0
0
0
(dB)
10
(dB)
10
330
30
330
30
20
20
30
30
300
60
300
60
40
40
50
50
270
90
270
90
240
120
240
120
NBM40-50-11
NBM50-118-9L
Fig. 2-11. Directivity
Note: Transducers with non-standard shapes and dimensions
are also available. For inquiries, see page 34.
Piezoelectric Ceramics Vol.04 25
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
High-Frequency Transducers
Outline
Compared to ordinary piezoelectric transducers, these
types operate at much higher frequencies: usually in
the 1~10 MHz range. One of the primary applications
of high-frequency transducers is as a sensor for flaw
detection. Another important application area is
medical equipment; in fact, with ultrasonic diagnosis
becoming ever more widespread, HF piezoelectric
transducers are the focus of increasing attention.
Here are some of the types of ultrasonic diagnosis
that require HP transducers:
Fetus phonocardiographs
Doppler system:
Blood flowmeter
Features
Tomography Electron scanning
Pulse echo
• High impedance at resonant frequency.
• Excellent electromechanical coupling in thickness
vibration mode.
• High sensitivity.
• Both thickness and radial vibration offer good
anisotropic properties.
Mechanical scanning
system:
Cranial disease diagnosis
Cardiac wall displacement measurement
The vibration mode of these transducers is usually
thickness resonance, and the frequency is high. For
this reason, thin plate transducers with low impedance
at resonance are needed. The dielectric constant of
NEC TOKIN NEPEC® is low, and its impedance
characteristics and other performance parameters are
excellent for use in high-frequency transducers.
• Thickness resonance spurious emissions are low, and
resolution is excellent.
Specifications Example
Table 2-8
Dimensions (mm)
Characteristics
C (PF) Terminal
Shape
Material
t
f
(kHz)
r
Kr
0.60
0.55
0.57
–
K31
d
0.5
–
–
4,000
2,100
6,400
6,500
5,000
4,000
6,500
5,000
4,000
3,000
7,000
2,700
S
S
S
P
P
P
P
P
P
P
20
20
10
20
20
25
15
15
15
15
–
21
8
d
t
1.0
0.3
0.3
0.4
0.5
0.3
0.4
0.5
0.6
–
–
–
3,000
21
21
21
21
21
21
21
21
20
20
25
80
80
100
100
0.30
0.30
0.30
0.30
0.30
0.30
0.30
13,500
10,500
14,000
42,000
32,500
33,000
28,500
d
t
–
–
–
d
t
–
–
–
26 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Aerial Microphone Transducers
Outline
Ultrasonic aerial microphones generate ultrasonic
waves that are radiated through the air and reflected
from a target to measure distance. These microphones
are used for traffic control, obstacle detection, as robot
sensors, and in other similar applications.
Transducers for aerial microphones are of two types,
bimorph and cylindrical , with different vibration
modes. Such transducers are most often used together with
a horn mounted in the radiation plane. NEC TOKIN
aerial microphone transducers have good output
power, receiving sensitivity and directivity-all
important in this type of application.
Features
• Good temperature characteristics.
• Cylindrical transducers are moisture-resistant,
ensuring stable operation outdoors.
• High mechanical coupling, high sensitivity.
Specifications of Standard Models
Circuit Example
Lead wires
Metal case
H
Shape
Table 2-9. N-21 Specification Example
D (mm) d (mm) H (mm) fr (kHz)
K
C (PF)
28000
19600
Direction of sound waves
Cylindrical
38
36
34
31
30
30
23.7
25.8
0.25
0.25
transducer
Reflector
Ultrasonic wave
Bimorph transducer
External case
(resonance plate)
t
Shape
Silicone rubber ring
Table 2-10. N-6 Specification Example
Terminal
D (mm)
t (mm)
fr (kHz)
Δf (kHz)
C (PF)
18.7
1.5
23.5
2.0
2100
Fig. 2-12. Details of Construction
Piezoelectric Ceramics Vol.04 27
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Sonar Transducers
Outline
Depth finders, underwater detectors, and fish finders
all utilize the principle of sonar, in which sound waves
are radiated through the water to detect and measure
the distance to the target. Although there are
differences in the resolution and distance capabilities
required of sonar transducers, in general all should
have the best possible sensitivity, resolution,
directivity, and reliability. Sonar transducers
fabricated of NEC TOKIN’s superior NEPEC® material
score high marks in all departments, and are available
for a wide variety of applications.
Characteristics of Sonar Transducer Materials
Table 2-11
Transducer type
Vibration mode
Operating frequency
Main features
Remarks
Easy frequency adjustment
High mechanical strength
a
b
c
d
Disc
Thickness vibration
70 ~ 500
Easy frequency adjustment
Good electromechanical coupling
Square column
Cylinder
Longitudinal vibration
Thickness vibration
40 ~ 100
Dimensions and characteristics
are determined according to the
requirements of specific
customers.
100 ~ 500
Adjustment of mechanical
Q and frequency are easy
Diameter direction vibration
10 ~ 200
Low frequency can be obtained at
low impedance
Langevin
Longitudinal vibration
20 ~ 100
Direction of sound wave radiation
(Displacement direction)
Direction of polarization
(a)
( )
b
(c)
(d)
Fig. 2-13
Types and Features
Table 2-12
T
Features
Material
N-6
K
31
ε
33
/
ε
0
Qm
1500
75
Tc (˚C)
325
0.34
0.38
1400
1800
Excellent stability at high output levels
Low Qm and high sensitivity
N-21
300
28 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Piezoelectric Ceramics Vol.04 29
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
30 Piezoelectric Ceramics Vol.04
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
Precautions
• The names of the products and the specifications in this
catalog are subject to change without notice for the sake
of improvement. The manufacturer also reserves the right
to discontinue any of these products. At the time of
delivery, please ask for specification sheets to check the
contents before use.
• When ordering transducers or other finished products
Specify model name and number when placing an
order for transducer products such as molded trans-
ducers for underwater use. Also note any special require-
ments.
• This catalog is current as of March 2010.
• Material selection, installation and activation of piezoelec-
tric ceramics should be decided upon by users according
to the application. For proper evaluation and decision,
products should be tested repeatedly in both realistic and
abnormal operating conditions.
• The manufacturer’s warranty will not cover any disadvan-
tage or damage caused by improper use of the products,
deviating from the characteristics, specifications, or
conditions for use described in this catalog.
• Please be advised that the manufacturer accepts no
responsibility for any infraction on third party patents or
industrial copyrights by users of the manufacturer’s
products. The manufacturer is responsible only when
such infractions are attributable to the structural design of
the product and its manufacturing process.
• No part of this document may be reproduced without
written permission from the manufacturer.
• Export Control
For customers outside Japan
NEC-TOKIN products should not be used or sold for
use in the development, production, stockpiling or
utilization of any conventional weapons or mass-
destructive weapons (nuclear weapons, chemical or
biological weapons, or missiles), or any other weapons.
For customers in Japan
For products which are controlled items subject to the'
Foreign Exchange and Foreign Trade Law' of Japan,
the export license specified by the law is required for
export.
• When ordering NEPEC Piezoelectric Materials
Specify the following items when placing an order with
NEC TOKIN for NEPEC :
1) Shape (disc, column, cylinder, square plate, sphere,
or bimorph).
2) Desired material and application.
3) Dimensions.
4) Vibration mode and resonant frequency used.
5) Whether special surface treatment is required, and if
so, what type.
6) S, P, or other designated terminal.
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.03.19 9307PIEVOL04E
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