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DESCRIPTION JPH04165795

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DESCRIPTION JPH04165795
[0001]
The present invention relates to a flat loudspeaker using a piezoelectric speaker. (Conventional
art) In a general structure of a flat speaker using a piezoelectric sounding body, two foamed resin
plates 3 and 4 having a plurality of concave portions 3b and 4b formed on the main surface Are
bonded together so as to face each other, and in the plurality of recesses 3b and 4b, the central
portion of the piezoelectric sounding body 1 is held by the projections 3a and 4a in the
respective recesses 3b and 4b. As shown in FIG. 5, each piezoelectric sounding body 1 has a
circular piezoelectric plate 1b (for example, made of PZT) with a diameter smaller than that of
the circular metal plate 1a coaxially attached to the circular metal plate 1a. Lead wires 9 are
soldered to the outer peripheral portion of the metal plate 1a and the electrodes on the surface
side of the piezoelectric plate 1b, and an elastic adhesive 1o such as silicon is applied to prevent
the lead wires 9 from contacting each other. ing. The lead wires 9 soldered to the electrodes of
the metal plate 1a and the piezoelectric plate 1b are wired between the opposing surfaces of the
two foam resin plates 3 and 4 as shown in FIG. The relay substrate 11 is soldered to the
(Problems to be Solved by the Invention) In the above-described conventional flat speaker, the
lead wire is drawn to the outer peripheral side of the piezoelectric sounding body. By the way,
since this outer peripheral portion 1 is the portion with the largest amplitude, the two lead wires
soldered to the piezoelectric sounding body contact with each other while vibrating, generating
chattering noise and the sound quality being degraded . Therefore, an elastic adhesive such as
silicon must be applied to this portion to prevent the lead wires from coming into contact with
each other, which lowers productivity. This tendency becomes more remarkable as the number of
piezoelectric sounding members increases. Moreover, it is difficult to make uniform the
application amount and application state of the elastic adhesive, and there is a problem that the
sound quality is not constant. Furthermore, the lead wire soldered to the outer peripheral portion
of the piezoelectric sounding body is wired between the facing surfaces of the two foam resin
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plates, and is directly soldered to the relay substrate for relaying to the external cable. Wire
wiring processing and soldering work also cause a decrease in productivity. (Means for Solving
the Problems) In the flat speaker according to the present invention, two foamed resin plates
having recesses formed on their main surfaces are pasted together so that the recesses face each
other, and they are in the recesses In the flat speaker in which the central portion of the
piezoelectric sounding body is held by the projection in the recess, a metal foil is wired on each
of the opposing surfaces of the two foamed resin plates so as to pass through at least the
projection. A conductive adhesive is interposed between the sounding body and the metal foil,
and the piezoelectric sounding body and the metal foil are electrically connected.
(Operation) In the flat speaker according to the present invention, since the metal foil is wired on
the opposing surface of the foamed resin plate, the lead wire itself becomes unnecessary.
Therefore, the work of soldering the lead wire to the piezoelectric sounding body, the work of
soldering the lead wire to the relay substrate, and the work of applying the elastic adhesive to the
lead wire near the outer periphery of the piezoelectric sounding body are also unnecessary. An
embodiment of the present invention will be specifically described with reference to the
drawings. FIG. 1 is a cross-sectional view of a flat loudspeaker according to the present invention.
The diaphragm 2, which emits a sound from the front side when vibration is applied, is formed
by bonding two foamed resin plates 3.4 made of expanded polystyrene, expanded polyethylene
or the like in the front-rear direction. Both foamed resin plates 3.4 have a rectangular shape, but
the foamed resin plate 3 on the front side is slightly larger than the foamed resin plate 4 on the
rear side, and a stepped portion is formed on the bonding surface of both Ru. A plurality of
recesses 3b and 4b are respectively formed on the opposing surfaces of the foamed resin plates
3 and 4. In these recesses 3b and 4b, a plurality of piezoelectric sounding bodies 1 are formed by
the protrusions 3a and 3b in the recesses 3b and 4b. The central part of each is clamped. 2 and 3
are plan views showing the opposing surfaces of the foamed resin plate 3.4 used in the present
invention, and FIG. 2 shows the foamed resin plate 3 on the front side, and FIG. 3 foams on the
rear side. The resin plate 4 is shown. The plurality of recessed portions 3b and 4b and the
protruding portions 3a and 4a are respectively formed on the opposing surface of the foamed
resin plate 3.4, and in the present embodiment, for example, a total of nine longitudinal three
rows and three lateral rows The four portions 3b and 4b are formed, and the protruding portions
3a and 4a are respectively formed in the nine concave portions 3b and 4b. In the foam resin
plate 3 on the front side, a metal foil 5a such as a tape-shaped copper foil having an adhesive
applied on one side passes in the lateral direction so as to pass through the apexes of three
projections 3a in three horizontal rows. One metal foil 5a is wired in the vertical direction so as
to intersect the left ends of the three metal foils 5a wired in the horizontal direction, and the
intersection of these is subjected to a soldering process. The lower end portion of the metal foil
in the longitudinal direction is tangent to the external cable at the outer peripheral portion of the
foamed resin plate 3. The foam resin plate 4 on the back side is 3 in the longitudinal direction so
that the metal foil 5b such as a tape-like copper foil having an adhesive applied on one side
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passes through the apexes of the three projections 4a in each of the three vertical rows. One
metal foil 5b is wired in the vertical direction so as to intersect the lower ends of the three metal
foils 5b wired in the main direction and wired in the vertical direction, and these intersections
are subjected to a soldering process. The lower end portion of the rightmost metal foil 5 b among
the three metal foils 5 b wired in the longitudinal direction is connected to the external cable at
the outer peripheral portion of the foamed resin plate 4.
The metal foils 5a and 5b are in the form of a tape in which an adhesive is applied on one side,
and the surface to which the adhesive is applied is attached to a predetermined position on the
opposing surface of the foamed resin plates 3 and 4 respectively. Installed by The metal foils 5a
and 5b are made of a plastic tape with an adhesive applied to one side and a metal foil such as
copper foil individually attached to the other side, making handling easy and easy to use. It
improves more. The metal foil wired to the foam resin plate 3 on the front side becomes the +
side metal foil 5a, and the metal foil wired to the foam resin plate 4 on the rear side becomes the
one side metal foil 5b. The front and rear two foamed resin plates 3.4 are laminated so as to face
each other, and the conductive adhesive 6 is applied to the opposite surface side of the + side
metal foil 5a and the one side metal foil 5b on the top of the protrusion. While being electrically
connected to the piezoelectric sounding body 1 via the conductive adhesive 6, the piezoelectric
sounding body 1 is fixed between the projections 3a and 4b. The piezoelectric sounding body 1 is
formed by concentrically bonding a piezoelectric plate 1 b (for example, made of PZT or the like)
having a smaller diameter than that of the circular metal plate 1 a on one side. The positive metal
foil 5a is electrically connected to the central portion of the piezoelectric plate 1b via the
conductive adhesive 6 on the apex of the projection 3b, and the negative metal foil 5b is the apex
of the projection 4b. Above, it electrically connects with the center part of the metal plate 1a via
the conductive adhesive 6. As shown in FIG. A frame 7 is provided at the periphery of the
diaphragm 2 to cover it. The frame 7 has a frame shape, and the peripheral portion of the
diaphragm 2 is inserted into and connected to a groove having a U-shaped cross section formed
over the entire length of the inner peripheral portion. In addition, an elongated tape-like elastic
support piece 8 is interposed over the entire circumference of the step formed on the bonding
surfaces of the front and rear two foam resin plates 3 and 4. A structure 2 is supported by the
frame 7. (Effects of the Invention) Since the flat speaker of the present invention does not require
a lead wire, the work of soldering the lead wire to the piezoelectric sounding body and the work
of soldering the lead wire to the relay substrate are naturally also unnecessary. Improve. The
metal foil is wired so as to pass through the projections of the foam resin plate, and the metal
foils of the foam resin plates do not come in contact with each other, and therefore there is no
risk of chattering noise, so an elastic adhesive such as silicon is used. There is no need to apply,
and the productivity is improved. In addition, since the metal foil wiring is made by sticking one
side of the metal foil with the adhesive on the predetermined position of the foamed resin plate,
the work is prepared compared to the lead wiring and requires skill. do not do. Furthermore,
according to the present invention, the relay substrate itself for relaying to the external cable is
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not necessary.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIGS. 2 and 3 are plan views showing metal foils wired on the opposite surface side of the
foamed resin plate used in an embodiment of the present invention, and FIG. 2 is a foamed resin
plate on the front side FIG. 3 shows the foam resin plate on the rear side. FIG. 4 is a plan view
showing a conventional example, and FIG. 5 is an enlarged sectional view of a main part of the
conventional example. 1- .. Piezoelectric sounding body, 1a: metal plate, 1b: piezoelectric plate, 2:
diaphragm, 3.4: foamed resin plate, 3a, 4a: projection, 3b, 4b иии Recesses, 5a и и и + side metal foil,
5b и и и-side metal foil, 6 и и и conductive adhesive, 7 и и и frame, 8 и и и elastic support piece, 9 и и и Lead wire, 10: elastic adhesive, 11: relay board.
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