JPH03293897A - Thin speaker - Google Patents

Abstract

PURPOSE:To improve sound quality by locating a piezoelectric sounding body at the laminating part of a corrugated board with a foaming resin panel on which specific holes are provided, respectively. CONSTITUTION:Holes 13, 14 provided at a plastic corrugated board 11 are provided with diameters larger than that of the piezoelectric sounding bodies 17, 18 for high frequency and low frequency, respectively, and holes 15, 16 provided at hard urethane foam 12 are provided with the diameters smaller than that of the sounding bodies 17, 18 for high frequency and low frequency, and the holes 13, 14 and 15, 16 are provided in a position where the center of the plastic corrugated board 11 coincides with that of the hard urethane foam 12 when they are laminated. The sounding bodies 17, 18 are inserted into the holes 13, 14 of the plastic corrugated board 11, and the outer peripheral edges of the sounding bodies are brought in contact with the outer periferal edges of the holes 15, 16 of the hard urethane foam 12, and are fixed with a tacky adhesive agent. Thereby, the sound quality of a thin speaker can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thin speaker using a piezoelectric sounding body.

[Prior Art] Conventionally, this type of thin speaker was made using two pieces of plastic cardboard with holes smaller than the diameter of the piezoelectric sounding body.
so that the outer circumferential edge of the hole and the outer circumferential edge of the piezoelectric sounding element match.
A piezoelectric sounding element is inserted, and a membrane member is attached to the surface of the plastic cardboard to create a cavity in the space formed by the membrane member and the piezoelectric sounding element and the space formed by the center of the plastic cardboard and the liner. It is known that

[Problems to be Solved by the Invention] However, conventional thin speakers have problems in that the sound quality is poor, such as muffled sound and not matching the real voice.

The present invention aims to improve the sound quality of a thin speaker.

[Means for Solving the Problems] According to the present invention, there is provided a thin speaker in which a piezoelectric sounding body is provided on a bonded surface of a cardboard and a foamed resin panel, the panel having a diameter smaller than that of the piezoelectric sounding body. a first hole having a diameter larger than the diameter of the piezoelectric sounding body; the cardboard is provided with a second hole having a diameter larger than the diameter of the piezoelectric sounding body; The piezoelectric sounding body is attached to the second piezoelectric sounding body so that the central axis of the hole coincides with the
A thin speaker is obtained, characterized in that the piezoelectric sounding body is inserted into the first hole, and the outer peripheral end of the piezoelectric sounding body is adhesively fixed to the outer peripheral end of the first hole.

In addition, the thin speaker is a thin speaker in which a piezoelectric sounding body is provided on each of the N-1 bonded surfaces of N (N22) panels made of foamed resin stacked and bonded together, and the N panels are Holes are provided so that when the piezoelectric sounding bodies are pasted together, their central axes coincide, and holes having a diameter larger than the diameter of the piezoelectric sounding body and holes having a diameter smaller than the diameter of the piezoelectric sounding body are located alternately. The body has its outer peripheral end fixed in contact with the outer peripheral end of a hole on at least one side of the panel having the small diameter hole, and the panel having the large diameter hole is connected to the piezoelectric sound generator of the panel having the small diameter hole. A thin speaker characterized in that the body is attached to a fixed surface and the piezoelectric sounding bodies are juxtaposed is obtained.

[Example〕 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. FIG. 1(b) is a 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).

The plastic cardboard 11 and the hard urethane foam 12 of this embodiment each have two holes 1B for high-pitched sounds and low-pitched sounds.
, 14, 15. and 16 are provided.

The holes 13 and 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. Also, holes 15 for high and low sounds provided in the hard urethane foam 12.
16 has a diameter smaller than the diameter of the piezoelectric sounding body 17 for the first high pitched sound and the piezoelectric sounding body 18 for the low pitched sound, respectively.

Holes 13 provided in these plastic cardboard boxes 11.
14 and the hole 15.1 provided in the hard urethane foam 2
6 is provided at a position that coincides with the center of the plastic cardboard 11 and the hard urethane foam 12 when they are laminated together. Also, these holes 13 and 14, 15 and 1
6 are arranged so that they are not adjacent to each other in the direction in which the columns of the plastic cardboard 11 extend (direction of arrow B).

An adhesive material (such as double-sided tape, not shown) is provided on one surface of the rigid urethane foam 12, and the plastic cardboard 11 is pasted with this adhesive material.

The piezoelectric sounding body 17.18 is inserted into the hole 13.14 of the plastic cardboard 11 and the hole 1 of the hard urethane foam 12.
The outer circumferential end thereof is brought into contact with the outer circumferential edge of 5.16, and is fixed to the surface of the hard urethane foam 12 with an adhesive material.

The lead wires 19, 20 of the piezoelectric sounding bodies 17, 18 are passed between the tiers of the plastic cardboard 11 and taken out to the outside. These piezoelectric sounding bodies 17 and 18 are driven in parallel connection with their polarization directions being made the same.

Metal plates (
(aluminum plates, etc.) 21 and 22 are fixed with polyester plates (not shown). This results in
A pack cavity is configured.

In this way, when the metal plates 21 and 22 are attached, the sound pressure at low frequencies is improved.

Moreover, Kapton tape or the like (not shown) is applied to the front surface of the plastic cardboard to form a front cavity.

This thin speaker is made of, for example, an aluminum frame (not shown).
is stored in.

In this example, hard urethane foam was used, but hard styrene foam may also be used.

Next, a second embodiment will be described with reference to FIG. Explain.

In this example, the first to fourth four panel materials 31, 32
．． 33 and 34 are used. These panels are made of rigid urethane foam or rigid styrofoam.

Holes 35, 36, 37, and 38 are provided in each of the panels 31, 32, 33, and 34 so that their centers coincide when the four panels are laminated together. The sizes of these holes 35, 36, 37, and 38 are the first
The diameter of the third panel 31.33 is smaller than the diameter of the piezoelectric sounding body 39, and the diameter of the second and fourth panels 32.34 is larger than the diameter of the piezoelectric sounding body 39.

Double-sided tape is attached to one side of the first panel and both sides of the third panel. The outer peripheral edge of the piezoelectric sounding body 39 is connected to the holes 35 and 37 on the surface where the double-sided tape is applied.
is fixed in contact with the outer peripheral edge of the Here, the piezoelectric sounding body 3
The polarization directions of 9a, 39b, and 39c do not need to match.

Furthermore, these four panels 31, 32, 33, and 34 are also adhered to one another using double-sided tape.

A metal plate 40 is attached to the back side of the first panel 31, and a poster or the like is attached to the front side of the fourth panel 34 to form a cavity.

Note that in this embodiment, four panels are used, but the present invention is not limited to this.

Furthermore, in this embodiment, the case where the piezoelectric sounding elements are arranged side by side in one row has been described, but it is also possible to
type) may be provided.

Further, in the present invention, it is possible to change the thickness of the panel and the size of the hole having a diameter larger than the diameter of the piezoelectric sounding body, and may be changed in accordance with the acoustic design.

[Effects of the Invention] According to the present invention, by positioning the piezoelectric sounding body on the bonded surface of the corrugated board and the foamed resin panel, the bulk vibration of the piezoelectric sounding body and the spatial cavity formed by the steps of the plastic corrugated board can be utilized. By doing this, you can improve the sound quality.

In addition, by laminating multiple foam resin panels together and placing a piezoelectric sounding element on each of the laminated surfaces, it is possible to improve sound pressure and sound quality. .

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the thin speaker of the present invention,
(a) is a plan view, (b) is a sectional view taken along line AA', and FIG. 2 is a longitudinal sectional view showing the second embodiment. 11...Plastic cardboard, 12...Hard urethane foam, 1B, 14, 15.16... Hole, 17゜1
8... Piezoelectric sounding body, 19.20... Lead wire, 21
゜22... Metal plate, 31, 32. 33. 34... Panel material, 35, 36, 37. 38... Hole, 39a, 3
9b, 39c...Piezoelectric sounding bodies.

Claims (2)

[Claims] 1. A thin speaker in which a piezoelectric sounding body is provided on a bonded surface of a cardboard and a foamed resin panel, wherein the panel has a first hole having a diameter smaller than the diameter of the piezoelectric sounding body, and the cardboard has a first hole having a diameter smaller than the diameter of the piezoelectric sounding body. A second hole having a diameter larger than the diameter of the sounding body is provided, and the panel and the cardboard are connected to the first hole and the second hole.
The piezoelectric sounding body is inserted into the second hole, and the outer circumferential end of the piezoelectric sounding body is adhesively fixed to the outer circumferential edge of the first hole. A thin speaker featuring 2. A thin speaker in which a piezoelectric sounding body is provided on each of the N-1 laminated surfaces of N (N≧3) panels made of foamed resin stacked and laminated together, and the N panels have a piezoelectric sounding body. When pasted together, their central axes match,
and holes are provided such that holes having a diameter larger than the diameter of the piezoelectric sounding element and holes having a smaller diameter are alternately located, and the piezoelectric sounding element has its outer peripheral end connected to the hole having the smaller diameter. the piezoelectric sounding body is fixed in contact with the outer peripheral edge of a hole on at least one side of a panel having a large diameter hole, the panel having a large diameter hole is bonded to the surface of the panel having a small diameter hole to which the piezoelectric sounding body is fixed; A thin speaker characterized by having sound generating bodies juxtaposed.