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JPH03297299

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DESCRIPTION JPH03297299
[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 space between the sound generating
body and the space formed by the film and the piezoelectric sounding body by sticking the film
member on the surface of the plastic cardboard and the space formed by the center of the plastic
cardboard and the liner as a cavity Are known. [Problems to be Solved by the Invention]
However, as in the prior art, thin speakers using two plastic cardboards have a problem that they
have an echo effect and the sound quality is poor. In addition, since the space formed by the
steps of the center of the plastic cardboard and the liner is used as a cavity, its size and shape can
not be designed freely, and there is a problem that the degree of freedom in acoustic design is
limited. An object of the present invention is to provide a thin speaker in which the degree of
freedom in acoustic design is expanded and the sound quality is improved. SUMMARY OF THE
INVENTION According to the present invention, a thin loudspeaker in which at least one
piezoelectric sounding body is located on an adhesive surface between a first surface of a first
panel and a second surface of a second panel. And the first panel has a first hole having a
diameter smaller than the diameter of the piezoelectric sounding body, and the second panel has
a diameter smaller than the diameter of the piezoelectric sounding body when combined. The
panel is divided into a plurality of panel pieces so as to form a second hole having a large
diameter and a wiring groove, and the central axes of the second hole and the first hole are the
same. The piezoelectric sounding body is inserted into the second hole, and the outer peripheral
end of the piezoelectric sounding body is bonded to the outer peripheral end of the first hole. A
panel having a height equal to the thickness of the panel piece on the first surface inside the two
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holes Thin speaker, characterized in that a lock is obtained. 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). An embodiment of the present invention will be described with reference to FIGS. 1 (a) and
(b). An adhesive material (a double-sided tape or the like is not shown) is provided on one surface
of the panel panel 11 made of expanded polystyrene used in the present embodiment. Further,
the panel board 11 is provided with holes 12 for attaching the piezoelectric sounding body.
The size of the hole 12 is smaller than the diameter of the piezoelectric sounding body 13 to
which the inner diameter is attached. In this embodiment, three vertical holes 12 for mounting
the low frequency piezoelectric sounding body 13a and two horizontal rows in total, six holes,
not shown, for mounting the high sound piezoelectric sounding body 13b are vertical Three are
provided in. The mounting holes for the treble piezoelectric sounding body 13b are provided in
parallel between the two rows of holes 12 for mounting the low frequency piezoelectric sounding
body. The piezoelectric sounding body 13 and the panel piece 14 are fixed to the surface of the
panel material 11 on which the adhesive material is provided by the action of the adhesive
material. Here, the piezoelectric sounding body 13a. 13 b is fixed so as to bring its outer
peripheral end into contact with the outer peripheral end of the hole 12 respectively. The panel
pieces 14a, 14b, and 14c are the same as the panel member 11, and the panel member 14 made
of expanded polystyrene is divided into three. The panel pieces 14a, 14b, and 14c are sized so as
to have a predetermined distance between the panel pieces 14a and 140 and between the panel
pieces 14c and 14b. 15 are formed. Further, the panel pieces 14a and 14b are respectively
provided with holes 16a whose diameter is considerably larger than the diameter of the
piezoelectric sounding body 13a. Generally, in order to improve the sound pressure in the low
frequency band (around 100 to 400 Hz), it is sufficient to increase the volume of the front cavity,
and for this reason, this hole 16a is enlarged, and its shape is not a perfect circle but one. The
department is missing. The panel piece 14c is provided with a hole 16b having a diameter larger
than the diameter of the piezoelectric sounding body 13b and a groove 17 for accommodating
the lead wire of the piezoelectric sounding body 13b. A panel block 18 is provided on the surface
of the panel 11 inside the hole 16 a and outside the piezoelectric sounding body 13 a. The panel
block 18 has a height equal to the thickness of the divided panels 14a, 14b, and is arched and
arranged to surround the piezoelectric sounding body 13a. Strip lines (not shown) are
respectively disposed in the grooves 15.17, and each piezoelectric sounding body 13a. The lead
13b is connected. As described above, since the strip line is used in the present embodiment, the
manufacturing process is simplified, and inspection such as disconnection can be facilitated. In
addition, a panel piece 19 is fixed to the end of the groove 15, and when a poster or the like is
attached to the surface of the panel 14, the hole 16 and the groove 15.17 are covered to form a
cavity. It is. In the present embodiment, the panel block 18 is provided in the hole 16 so that no
slack occurs in the poster.
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Further, a metal plate (aluminum plate or the like) 20 is attached to the back side of the hole 12
of the panel plate 11 with a polyester tape or the like (not shown). Thus, when the metal plate 20
is attached, an improvement in the sound pressure at low frequencies is observed. This thin
speaker is housed, for example, in an aluminum frame (not shown). Here, a cello tape or the like
may be attached to the side surfaces of the panel material 11 and the panel material 14. In the
present embodiment, the panel member 14 is not limited to being divided into three or is not
limited to this, and various modifications such as dividing into more, changing the width and
shape of the groove, and the like are possible. Also, the size and shape of the hole of the panel
member 14 and the size, shape and arrangement of the panel block can be freely changed to
perform acoustic design. Furthermore, a part of the plastic panels (for example, 14C) may be
used as the panel material 14. According to the present invention, the first panel in which the
first hole having the diameter smaller than the diameter of the piezoelectric sounding body is
formed and the second panel having the diameter larger than the diameter of the piezoelectric
sounding body when combined A second panel divided into a plurality of panel pieces such that
the hole and the wiring groove are formed, and the central axes of the second hole and the first
hole are the same; The first panel and the second panel are pasted together, the piezoelectric
sounding body is inserted into the second hole, and the outer peripheral end of the piezoelectric
sounding body is bonded to the outer peripheral end of the first hole By providing a panel block
having a height equal to the thickness of the panel piece on the first surface inside the second
hole, the size and shape of the front cavity can be freely changed, and in acoustic design The
degree of freedom is expanded, and the sound quality is improved. Fig. 1 (CL) Fig. 1 (b)
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows a first embodiment of a thin speaker according to the present invention, wherein (a)
is a plan view and (b) is a cross-sectional view taken along the line AA '.
11 · · · Panel material, 12 ... hole, 13a ... piezoelectric sounding body for bass, 13b ... piezoelectric
sounding body for high sound, 14a. 14b, 14 cm--panel pieces, 15- .. grooves, 16a. 16b: hole 17:
groove 18: block panel 19: panel small piece 20: metal plate
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