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DESCRIPTION JPH03293897

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DESCRIPTION JPH03293897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
thin speaker using a piezoelectric speaker. [Prior Art] Conventionally, as thin speakers of this
type, two plastic cardboards provided with holes smaller than the diameter of the piezoelectric
sounding body, so that the outer peripheral end of the hole and the outer peripheral end of the
piezoelectric sounding body coincide with each other The sounding body is swallowed, the
membrane formed on the surface of the plastic cardboard, the space formed by the membrane
and the piezoelectric sounding body, and the space formed by the center of the plastic cardboard
and the liner as the cavity What is known. [Problems to be Solved by the Invention] However, the
conventional thin speaker has a problem that the sound quality is poor, for example, the sound
quality is not matched with the natural voice. An object of the present invention is to improve the
sound quality of a thin speaker. [Means for Solving the Problems] According to the present
invention, it is a thin speaker provided with a piezoelectric sounding body on the bonding surface
of a cardboard and a foamed resin panel, wherein the panel has a diameter smaller than the
diameter of the piezoelectric sounding body. A first hole having a diameter is provided in the
cardboard, and a second hole having a diameter larger than the diameter of the piezoelectric
sounding body is provided, and the panel and the cardboard are the first hole and the second.
The piezoelectric sounding body is inserted into the second hole, and the outer peripheral end of
the piezoelectric sounding body is adhesively fixed to the outer peripheral end of the first hole.
The thin speaker characterized by it is obtained. A thin speaker in which a piezoelectric sounding
body is provided on each of N-1 bonding surfaces in which N (N22) panels of foam resin are
stacked and bonded, and the panels are provided on the N panels. Holes are provided so that the
central axes thereof coincide with each other when they are laminated, and one having a
diameter larger than that of the piezoelectric sounding body and one having a smaller diameter
alternately are located, and the piezoelectric sounding The body is fixed at its outer peripheral
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end to the outer peripheral end of the hole of at least one surface of the panel having the small
diameter hole, and the panel having the large diameter hole is the piezoelectric sounding of the
panel having the small diameter hole It is possible to obtain a thin speaker characterized in that
the body is attached to a fixed surface so that the piezoelectric sounding body is juxtaposed. The
present invention will be described in detail below with reference to the drawings. Here, FIG. 1
(a) is a front view of the thin speaker of the present invention. 1 (b) is a cross-sectional view
taken along line AA 'of FIG. 1 (a). A first embodiment of the present invention will be described
with reference to FIGS. 1 (a) and 1 (b). In the plastic cardboard 11 and the hard urethane foam
12 of this embodiment, two holes 1B, 14, 15.
And 16 are provided. The holes 13.14 provided in the plastic cardboard 11 have diameters
larger than the diameters of the high-pitched piezoelectric sounding body 17 and the low-pitched
piezoelectric sounding body 18, respectively. Further, the high sound and low sound holes 15.16
provided in the hard urethane foam 12 have diameters smaller than the diameters of the one
high sound piezoelectric sounding body 17 and the low frequency piezoelectric sounding body
18, respectively. The holes 13.14 provided in the plastic cardboard 11 and the holes 15.16
provided in the hard urethane foam 2 coincide with each other when the plastic cardboard 11
and the hard urethane foam 12 are bonded. It is provided in the position. These holes 13 and
14.15 and 16 are not adjacent to each other in the direction in which the steps of the plastic
cardboard 11 extend (arrow B direction). An adhesive material (a double-sided tape or the like is
not shown) is provided on one surface of the hard urethane foam 12, and the plastic cardboard
11 is bonded by this adhesive material. The piezoelectric sounding body 17.18 is inserted into
the hole 13.14 of the plastic cardboard 11, and the outer peripheral end of the hard foam
urethane 12 is brought into contact with the outer peripheral end of the hole 15.16, and the
adhesive material adheres to the surface of the hard foam urethane 12. It is fixed. The lead wires
19.20 of the piezoelectric sounding body 17.18 are taken out to the outside through the steps of
the plastic cardboard 11. The piezoelectric sounding members 17.18 are driven in parallel
connection with their polarization directions matched. In the holes 15 and 16 of the hard
urethane foam 12, a metal plate (aluminum plate or the like) 21.22 is fixedly attached with a
polyester tube or the like (not shown). This constitutes a pack cavity. Thus, when the metal plate
21.22 is attached, an improvement in sound pressure at low frequencies is observed. Further,
Kapton tape or the like (not shown) is stretched on the front surface of the plastic cardboard to
form a front cavity. This thin speaker is housed, for example, in an aluminum frame (not shown).
Although rigid urethane foam is used in this embodiment, rigid polystyrene foam may be used.
Next, referring to FIG. 2, a second embodiment. Explain. In this embodiment, first to fourth four
panel members 31. 32. 33 and 34 are used. These panels consist of rigid foam urethane or rigid
foam. Holes 35.36.37 and 38 are provided in each of the panels 31.32.33 and 34 so that when
the four panels are stacked and bonded, their centers coincide.
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The size of the holes 35.36.37 and 38 is smaller than the diameter of the piezoelectric sounding
body 39 for the first and third panels 31.33, and is piezoelectric for the second and fourth panels
32.34. The diameter is larger than the diameter of the sound generator 39. A double-sided tape is
attached to one side of the first panel and to both sides of the third panel. The outer peripheral
end of the piezoelectric sounding body 39 is fixed in contact with the outer peripheral ends of
the holes 35 and 37 on the surface on which the double-sided tape is stretched. Here, the
polarization directions of the piezoelectric sounding bodies 39a, 39b, and 39c may not be the
same. Further, these four panels 31.32.33.34 are also adhered so as to be superposed by the
action of the double-sided tape. A metal plate 40 is attached to the back surface of the first panel
31, and a poster or the like is attached to the surface of the fourth panel 34 to form respective
cavities. In the present embodiment, four panels are used or not limited thereto. Further,
although the case where the piezoelectric sounding bodies are juxtaposed in one row has been
described in this embodiment, a plurality of rows (for example, two types for high and low tones)
may be provided. Furthermore, in the present invention, the thickness of the panel and the size of
the hole having a diameter larger than the diameter of the piezoelectric speaker can be changed,
and may be changed in accordance with the acoustic design. According to the present invention,
by positioning the piezoelectric sounding body on the bonding surface of the cardboard and the
foam resin panel, bulk vibration of the piezoelectric sounding body and the space cavity by the
step of the plastic corrugated board are used. By doing this, the sound quality can be improved.
In addition, since a plurality of foam resin panels are stacked and bonded, and the piezoelectric
sounding bodies are respectively positioned on the bonding surfaces and juxtaposed with the
piezoelectric sounding bodies, it is possible to improve the sound pressure and the sound quality.
.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows a first embodiment of the thin loudspeaker according to the present invention,
wherein (a) is a plan view, (b) is a sectional view taken along the line AA ', and FIG. 2 is a
longitudinal sectional view showing the second embodiment. is there.
11: Plastic cardboard, 12: Hard urethane foam, 1B, 14, 15.16: Hole, 17 ° 18: Piezoelectric
sounding body, 19.20: Lead wire, 21 ° 22 · · Metal plate, 31, 32. 33. 34 · · Panel material, 35,
36, 37. 38 · · · Holes 39a, 39b, 39c · · · · Piezoelectric sounding body.
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