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DESCRIPTION JPS57152800

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DESCRIPTION JPS57152800
DESCRIPTION OF THE PREFERRED EMBODIMENTS Piezoelectric Speaker 1) A piezoelectric
diaphragm in which a piezoelectric material Y is bonded to a metal plate, and a cone-shaped cone
paper whose top is coupled to the center of the piezoelectric diaphragm. Piezoelectric speaker (=,
vibration cans at locations other than the central portion of the piezoelectric diaphragm,
connecting members for transmitting to the side surface of the cone paper at four places
between the piezoelectric diaphragm and the cone paper Piezoelectric speaker characterized by
being stretched. 2) A piezoelectric diaphragm in which a piezoelectric material is bonded to a
metal plate, V; a plurality of conical cone papers whose tops are concentrically connected to the
piezoelectric diaphragm, and a composite piezoelectric speaker including all of them C: In the
imaging force 'lk! Of each of the above-mentioned cone papers (two, the piezoelectric diaphragm
other than the junction of the top of the cone and the piezoelectric diaphragm). A side surface of
the cone paper (-a connecting member for transmitting is a suitable number of places between a
piezoelectric diaphragm and each cone paper (-a piezoelectric speaker characterized in that it is
stretched).
2, the scope of claims
8. Detailed Description of the Invention The present invention relates to a piezoelectric speaker (::
as a piezoelectric imaging plate driving source). (1) is a disk-shaped piezoelectric diaphragm
formed by laminating a piezoelectric material on one side or both sides of a thin metal plate, and
both of the piezoelectric materials (TB = signal voltage Depending on what you give, it is a flexing
movement. (2) is a conical cone paper, the top of which is the center C of the above-mentioned
piezoelectric diaphragm port); adhesively bonded. (3) is a frame, and its opening side C2 is
connected to the @ circumference of corn paper. Such a piezoelectric speaker is a device that
applies an acoustic signal Y to the piezoelectric diaphragm + 11 (2 because cone paper is driven,
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compared to a speaker C having a general magnetic circuit, compared to @ amount Things that
can be miniaturized (1) The number of parts is small, the cost can be reduced, and there is no
magnetic influence, etc., and they are being put to practical use. However, the electro-acoustic
conversion efficiency of a speaker is generally evaluated according to its sound pressure. In the
piezoelectric speaker as described above, it was not considered that obtaining% satisfactory
sound pressure was necessarily achieved. EndPage: The present invention has been made in view
of the point of refusal, and aims to efficiently transmit the vibration force of the piezoelectric
diaphragm to cone paper. Figure 2 (a) (a cross-sectional view of one embodiment of the pressure
Φ speaker according to the present invention, and in the same figure (b) an exploded view of its
parent figure Y 8; +21. And (31 is a piezoelectric diaphragm, a cone paper, and a frame in the
same manner as in the conventional piezoelectric speaker in which each of FIG. In the place
where this piezoelectric speaker differs from the conventional product, a connecting member for
transmitting the vibration force of a portion other than the central portion of the piezoelectric
vibration line 1) to the side surface of the cone paper It's in the place where I made it. The
connecting member (4) is formed by forming a polyemsterfil of 75 voice scrap thickness into a
truncated-cylindrical cylindrical shape, and c has a disk-like piezoelectric vibration & (near 11
and a node of cone paper It is linked with the position. In a piezoelectric speaker of such a
configuration, a piezoelectric diaphragm (a bending vibration force appearing on the entire
surface of a cone is transmitted from its central portion to a cone paper (from the outer
peripheral portion to the cone paper 11) Transmitting to the circular position (: The driving force
to the cone paper (1) is increased. Fig. 1E-5 shows the wavenumber characteristics of the
conventional pressure a speaker shown in Fig. 1 (two) and the printing wave number
characteristic Y of the piezoelectric ス ピ ー カ speaker of the present invention shown in Fig. 4B
shown in Fig. 4B. Etc. Ili! Comparing the characteristics of the number, it can be seen that the
sound pressure of the piezoelectric speaker according to the present invention is improved by a
large width C. g4 shows the main part of another embodiment of the piezoelectric small speaker
according to the present invention. In this case, as the connecting member (4), radially from the
connection point between the center of the piezoelectric vibration 1i + 11 and the top of the cone
paper (2) (eight stay plates + 51 + 51... .
These stay plates (51 + 51 ... have a triangular structure whose center is cut out, and the vicinity
of the periphery of the piezoelectric diaphragm (1) and the cone paper (around the nodal
position of 21) And 7 connected. #! Fig. 5-) and (b) show the main parts of different
embodiments of the piezoelectric speaker according to the present invention. ! It is a compound
mold equipped with l number of corn paper. 1iii1 (in the case of al, the cone paper C2n of @ 1 is
bonded to the center of the piezoelectric diaphragm, and the second cone of cone is at the middle
position between the center and the periphery of the electrostatic diaphragm OQ) Paper
(concentrically connected to 211, in the case of bl (C2 in the case of bl, C: third C) The third cone
paper G is connected to the open position (= bonded of the piezoelectric diaphragm OI. In these
piezoelectric speakers, 1 is a connecting member of grade 1, and the connecting position of the
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piezoelectric diaphragm a to the second cone sheet a and the cone sheet of @ 1 (the nodal point
position of 211 are connected And this' @ 1 cone paper tall against the driving force is increased.
It is a connecting member of @ 2, and pressure 11141j! With the nodal position of the skin side
of moving plate 01 and 112 cone paper Q11? In connection with this second cone paper 2C, the
power is increased substantially. The connecting members (2) of these @ 1 and @ 2, the cylinder
is shown as a cylindrical shape similar to the connecting member (4) of Fig. 2 but a plurality of
stay plates of the Japanese umbrella shown at @ 4. T51 (51... May be used. In addition, such a
reinforcing member-or-! If a specific cone paper + 211 or (22 + (only two pairs are contained, the
driving force for this specific cone paper 1211 or is increased, and as a result, the sound
pressure of the reproduction 1 wave number shared by this cone @ C2 n The same wave number
characteristic is obtained with the same frequency. As is apparent from the above description, the
piezoelectric speaker according to the present invention is connected to an appropriate number
between a location other than the center S of the piezoelectric vibrating plate in which the cone
paper is coupled to the center and a side surface of the cone paper. Since the member is
stretched, that is, the above-mentioned cone paper C: the vibrational force of the central portion
of the piezoelectric vibrating plate can be transmitted together with the vibrational force of a
portion other than the central portion. Good (It is possible to exert it and measure the
improvement of back pressure. The piezoelectric speaker according to the present invention
further comprises a plurality of cone papers concentrically connected to the piezoelectric
diaphragm (a portion other than the junction between the top of the cone and the piezoelectric
diaphragm and the cone paper) Because the connecting member is stretched at a suitable
number of places between the side surfaces of the sheet, it is possible to efficiently transmit the
vibration force of the diaphragm to each cone sheet.
Therefore, it is possible to measure the same as the sound pressure of the piezoelectric speaker
with a large width and a wide width now in the reproduction frequency band, and thus the design
freedom of the speaker is increased, and the effect is remarkable.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 111 is a cross-sectional view of a conventional
piezoelectric speaker, 喝 2) is a cross-sectional view of a piezoelectric speaker according to the
present invention, and FIG.鳩) is the pigeon wave number characteristic curve EndPage: 2 FIG. 3
(α 縮 reduction 111-(HLI (b + / 11sl L * t Hs1 FIG. 4 (α ((bλEndPage:3
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