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JPS61150500

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DESCRIPTION JPS61150500
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite piezoelectric speaker using a plurality of pressure "Lt vibration elements" as a
magnetic-acoustic transducer. 2. Description of the Related Art In recent years, a strong
piezoelectric ceramic mainly composed of lead zirconium titanate has been developed in various
fields as a piezoelectric imaging element. Then, a large number of squeezable diaphragms in
which thin plates of this strong pressure ceramic are attached with an electrode surface are
bonded to one side (monomorph type) or both sides (bimorph type) of a metal plate base are
produced in large numbers, cost is significantly reduced. As mentioned above, the abovementioned pressure-welded ceramic is going to be widely used in electro-acoustic transducers.
[Problems to be Solved by the Invention] The above-mentioned conventional ferroelectric
ceramics are hard in their characteristics, and the elastic modulus E is extremely large,
approximately 80 × 10 − @ (N / 7F 1 ′), The property is that the brittleness is large and easily
broken, and the elastic limit is narrow. Therefore, the piezoelectric vibration plate based on this
has a high fundamental resonance frequency fo, a large resonance sensitivity Q, and a large
exposure width operation. In some cases, the excitation is weak and inadequate. By the way,
although a youth converter such as a speaker has been conventionally produced in each
direction by utilizing a piezoelectric diaphragm having such a property, the sensitivity is
generally low and the volume is small. The reproduced sound is mainly in the high range part of
the audible range and lacks the low range part, so that there is a problem that an acoustic
transducer having a sufficiently satisfactory performance can not be obtained. . The present
invention was made in order to solve such problems, and despite using pressure 'as a sound
transducer as a diaphragm, it has an output similar to that of a conventional permanent magnet
small pre-coil speaker. A composite type that has a sound pressure level, good sound
characteristics can be obtained in a wide reproduction band ranging from a low sound range to a
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high sound range as an audible sound range, and the shape can be configured to be flat and thin.
It aims at obtaining a piezoelectric speaker. [Means for Solving the Problems] In the composite
type piezoelectric speaker according to the present invention, a weight is coupled to the vicinity
of the center of gravity of the piezoelectric diaphragm via the visco-elastic layer, and excitation is
generated from the outer edge of the piezoelectric diaphragm. A plurality of pressure ti moving
elements configured to take out a force are provided, and an oscillating force is applied to one of
the piezoelectric imaging elements by directly connecting the acoustic radiation diaphragm to its
peripheral end. The The excitation force applied to the other piezoelectric imaging element
adjacent thereto is such that the diaphragm for youth radiation is biased through a connector
connecting the respective peripheral end portions of each piezoelectric imaging element. is there.
[Function] In the composite type piezoelectric speaker according to the present invention, a
weight is coupled to the vicinity of the center of gravity of the piezoelectric S @ plate via the
visco-elastic layer, and the excitation force is extracted from the outer edge of the piezoelectric
diaphragm. A plurality of piezoelectric vibrating elements.
The respective peripheral end portions are coupled to each other via a connector, and the
acoustic radiation diaphragm is directly connected to the peripheral end portion of one of the
piezoelectric vibrating elements, so that other members adjacent thereto are connected. The
excitation force applied to the piezoelectric vibration element has a sufficient output sound
pressure level compared to a conventional acoustic transducer using a piezoelectric diaphragm,
since the diaphragm for acoustic radiation is biased through the connector. High sound quality
can be obtained in a wide reproduction band ranging from a low sound area to a high sound area
as an audible sound area. FIG. 1 is a cross-sectional view showing a piezoelectric vibrating
element used in a composite type piezoelectric speaker according to an embodiment of the
present invention, and FIG. 2 is a composite constructed using the piezoelectric imaging element
of FIG. FIG. 2 is a cross-sectional view showing a shaped piezoelectric speaker. As shown in the
above figures, the piezoelectric vibrating element 1, 5.9. Each small weight 3, 7 11 11 is
connected to the pressure 1 in the vicinity of the center of gravity (center part) of the diaphragm
via the visco-elastic layers 2 and 6.10. Form the element. Then, a cone-shaped diaphragm 17
made of paper or the like, which is a diaphragm for sound emission, is directly connected to the
peripheral end 13 of the vibrating element 1 with the pressure 'located in the front part. The
outer edge is pivotally supported on the fixed part 15 by means of a resilient edge 12 with a
wave pleat. In addition, each piezoelectric vibration element 5.9 following the piezoelectric
vibration element 1 is integrally coupled with the piezoelectric vibration element 1 via the
respective connectors 4.8. Further, the small weight 11 at the rear portion is supported by the
fixing portion 15 via the elastic connector 14. Each pressure ti dynamic element 1.5.9 used here
may be either monomorph type or bimorph type, but all shown in the figure are monomorph
type. Also, each connector 4, 8 has elasticity and It is made of a material that has viscous
resistance, low mass and low transmission loss. As each of the connectors 4 and 8, for example,
about 6 to 8 square or circular small columns made of synthetic rubber such as chloroprene
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rubber or butyl rubber are equally spaced at the peripheral end of each piezoelectric imaging
element 5.9. The required propagation constant can be determined by adjusting the hardness of
the rubber, the cross-sectional area of the small pillars, the length, the number of used members,
and the like. FIG. 3 is a view showing an equivalent circuit of a vibration system in the composite
piezoelectric speaker of FIG. Figure 3 is. A so-called ladder type low pass filter is formed. In the
figure, D, D, D, the impedance of each pressure visa element 1, 5.9.
zo is the terminal impedance of the cone-shaped diaphragm 17, Zr, Zm and Zm are the respective
viscoelastic layers 2, 6, 10. ! : The sum impedance with each small weight 3,7,11, K,, K. Let be the
coupling impedance of each connector 4.8. According to the equivalent circuit shown in FIG. 3,
the respective imaging speeds v, v, v, V flowing in by the respective electromotive forces FlIFt, Fs
in the section where each piezoelectric vibrating element 1.5.9 exists. Is efficiently flowed into
the terminal impedance Zo of the cone-shaped diaphragm 17 which is a diaphragm for acoustic
radiation. Then, in the equivalent circuit of FIG. 3, the respective generating forces F1. The
frequencies of p, ps, f,> f. If the audible range is distributed so as to be> f, then the motive forces
Ft-Ft and Fm in each section can be efficiently compounded by energizing the termination
impedance z0. That is, the impedance D1 of the piezoelectric vibration element 1 in the front part
mainly biases the high range part of the audible range, and the impedance D of the pressure IC
imaging element 5 in the center part! Mainly share the mid-range part, and the impedance D of
the piezoelectric imaging element 9 on the rear part mainly share the low-range part. Now, each
signal voltage e1 applied to each impedance D +, Dt, Da. If e1, e1 are distributed roughly as
shown in FIG. 4 and the applied voltage level is set beforehand as et <et <eg in consideration of
the transmission loss in the middle, the radiation sound pressure P0 is approximately shown in
FIG. As shown in the figure, the impedance D is the high-frequency band ヲ between the
frequencies f1 to ft, the impedance D is the mid-range band between the frequencies f and f3, the
impedance D is the bass band between the frequencies f and fc By sharing the respective
characteristics, a totally flat sound pressure characteristic can be obtained, and the conversion
sensitivity is improved. The peak value of the frequency fQ of the midrange portion shown in FIG.
5 is a first collision point by the pressure-one vibration element of the center clamp type and
occurs at about 500 to 600 Hz. In the case of the pressure four speaker, the coupling
impedances Kr and Km of the respective connectors 4.8 absorb the resistance and disappear
until it is hardly noticeable. Next, a method of generating the signal voltages e and leg * eg
applied to the impedances Dz, Dt and Ds of the piezoelectric vibrating elements 1.5.degree. 9
shown in FIG. 4 will be described. Since the pressure a'i moving element usually has a
capacitance of about 80 to 100 X 10 F and the I KHz reactance is about 15 Ω, the step-up
transformer T with a winding ratio of about 1: 6, as shown in FIG. Using the impedance of the
primary coil.
Of the step-up transformer T can be obtained, and with respect to the primary command
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pressure ep of the step-up transformer T, each signal voltage eI + el + el is obtained as a
secondary voltage buildup. Since the operation of the pressure tm moving element serving as a
load is completely voltage-compatible, the step-up transformer T1 is relatively small and
sufficiently made, and moreover, the internal capacitance of the pressure one vibration element
and each insertion resistance R2 , Rs provide a voltage characteristic in which the high frequency
range is simply cut off. In addition, a semiconductor such as a voltage regulator diode ZD is
connected to the secondary side of the step-up transformer T1 via the insertion resistor R1 to
prevent an overvoltage from being applied to the piezoelectric vibration element. FIG. 7 is a
cross-sectional view showing a composite piezoelectric speaker which is an embodiment of the
pond of the present invention. FIG. 7 (a) shows a two-element configuration using a voltagevibrator # element 1.5, and the pressure IE can be applied to the pressure 1 vibration element 1
as the center. Is disposed forward facing through the connector 4, and the piezoelectric vibrating
element 5 is accommodated inside the included angle of the cone-shaped bm plate 17, and the
height of the composite piezoelectric speaker itself is configured as low as possible. In this case,
when the conical diaphragm 17 tilts due to the small weight 7, the small weight 7 is coupled via
the elastic connector 14 to the center bracket 16, which is a fixed part, for stabilization. 7 (b)
forms a three-element configuration using each pressure aL vibration element 1.5.9, but in this
case, with respect to the piezoelectric vibration element 1 as the center, The pressure vibration
elements 5 and 9 adjacent to this are divided into two jjjjl, and the piezoelectric vibration element
9 for the bass region requiring a large vibration constant and a large space is To accommodate in
the middle, pressure for midrange! Placing the dynamic element 5 in the rear part? The height of
the J base formation heart speaker itself is configured low. Here, FIG. 7 (not shown in bl, the
small beads @ 11 may be combined with the center bracket 16 which is the fixed portion as
described above) to be stabilized. As described above, in the composite piezoelectric speaker
according to the present invention, even when a medium-aperture speaker having a large
diameter, for example, about 150 to 250 inches, is configured using a piezoelectric lift element
as an acoustic transducer, electricity- The sound conversion sensitivity is enhanced to obtain a
desired volume level, and good acoustic characteristics can be obtained in a wide reproduction
band in the audible range. ! た。 Since the conventional permanent magnet type movable core is
suitable for mounting on a ceiling as a vehicle speaker or for door mounting, it is also suitable for
a portable device having a limited storage space.
Furthermore, unlike the conventional permanent magnet type moving coil speaker, since there is
no leakage flux emitted from the permanent magnet, there is no adverse effect on the ferrite bar
antenna for medium wave radio reception or the screen of the television, and its use The range is
very wide. [Effects of the Invention] The present invention has been described above. 9, in the
composite pressure or speaker, a plurality of pressure ti moving elements constructed by
connecting weights via the visco-elastic layer in the vicinity of the center of gravity of the
piezoelectric sliding plate Are connected to each other via a connector, and the diaphragm for the
above-mentioned radiation radiated directly connected to one piezoelectric vibrating element is
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energized, so that a pressure 'I / L vibrating element is used as an acoustic transducer. Although
the sound pressure level is sufficiently desired, good sound * = S property can be obtained in a
wide reproduction band ranging from the low sound area to the high sound area as an audible
sound area, and the shape is An excellent effect of obtaining a composite type piezoelectric
speaker that can be configured to be flat and thin and can be reduced in weight can be obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a pressure used in a composite piezoelectric speaker according to an embodiment of the
present invention?
4 is a cross-sectional view showing a composite type piezoelectric speaker configured using the
piezoelectric vibration element of FIG. 1, and FIG. 3 is a vibration of the composite type
piezoelectric speaker shown in FIG. The figure which shows the equivalent circuit of a system,
FIG. 4 and FIG. 5 are characteristic figures which show the signal area pressure of each
piezoelectric imaging element and the relationship of an output sound pressure and a frequency,
respectively in the composite pressure speaker of FIG. 6 shows an example of a circuit for
generating signal voltage electricity applied to each piezoelectric imaging element in the
composite piezoelectric speaker of FIG. 1, and FIG. 7 shows another embodiment of the present
invention. It is a sectional view showing a piezoelectric speaker. In the figure, 1.5.9 · · ·
Piezoelectric imaging element, 2 ° 6. 10 · · · Viscoelastic layer, 3, 7. 11 · · · small weight, 4 ° 8 · ·
· ·, 12 Elastic edge 13 Peripheral edge 14 Elastic connector 15 Fixing portion 16 Center bracket
17 Conical diaphragm. In the drawings, the same reference numerals indicate the same or
corresponding parts. Fig. 3 Shield 5 Good Raid (Hz) Fig. 5 Fan Attack (Hz) Fig. 6 (a) 16: Zenk 7
Laque, 2 Doors (b)
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