JPH04287500A - Panel speaker - Google Patents

Abstract

PURPOSE:To realize the panel speaker with thin profile and excellent acoustic characteristic by forming a recessed part of a shape corresponding to an amplifier section to an acoustic diaphragm, fitting the amplifier section to the recessed part and fixing it directly to a frame. CONSTITUTION:An acoustic diaphragm 1 is formed by combining foamed resin plates 2a, 2b and a piezoelectric acoustic driver 4 is inserted in a recessed part 3 formed to a position opposite to each other on faces opposite to each other in the foamed resin plates and supported by a small projection 5 in the recessed part 3 in a vibration possible way. Moreover, flat plate frames 7a,7b being front faces of the panel speaker at both sides of the acoustic diaphragm 1 are fitted via an elastic body 13. Moreover, a recessed part 14 is formed to an end of the acoustic diaphragm 1 to which the frame 7a is fitted and an amplifier section 15 of the acoustic system is fitted to the recessed part 14 and fixed directly. Thus, the projection of the amplifier section is prevented and no stress is exerted to the acoustic diaphragm and the deterioration in the characteristic such as the frequency characteristic and the sound pressure level is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel speaker using a piezoelectric acoustic driver, and more particularly to a panel speaker with a built-in amplifier.

0002

2. Description of the Related Art Panel speakers shown in FIGS. 4 and 5, for example, have been considered as panel speakers with a built-in amplifier that are hung on a wall or the like. FIG. 4 is a perspective view seen from the back side, and FIG. 5 is a side sectional view thereof. In this panel speaker, the acoustic diaphragm 51 is formed by disposing a piezoelectric acoustic driver made by bonding a piezoelectric element to a metal plate on a foamed resin plate, and the periphery (four sides) of the piezoelectric acoustic driver is made of metal such as aluminum. A frame 52 having a U-shaped cross section and made of plastic or resin is fitted into the frame 52 and fixed to the acoustic diaphragm 51 with screws 55. A recess 56 is formed in the lower part of the back surface of the acoustic diaphragm 51, and the amplifier part 5 of the acoustic system
7 is housed and fixed in the recess 56. Switches, input terminals, and the like 53 are drawn out from the bottom surface of the frame 52 so that the amplifier section 57 can be operated from the bottom surface of the frame 52.

0003

However, in the conventional panel speaker in which the amplifier section 57 is built in as described above, the amplifier section 57 is housed and fixed within the recess 56 of the acoustic diaphragm 51. There is a problem in that the load of the amplifier section 57 is applied to the acoustic diaphragm 51, resulting in deterioration of characteristics such as deterioration of frequency characteristics and reduction in sound pressure level. The present invention solves the above-mentioned problems, and aims to provide a panel speaker with a built-in amplifier that is thin and has no deterioration in characteristics such as frequency characteristics and sound pressure level.

0004

[Means for Solving the Problems] In order to achieve the above object, a panel speaker of the present invention includes an acoustic diaphragm formed by disposing a piezoelectric acoustic driver on a foamed resin plate, an amplifier section, and the acoustic vibration plate. A panel speaker comprising a frame attached around a plate, the acoustic diaphragm having a recess in a shape corresponding to the amplifier part, the amplifier part being fitted into the recess, and the speaker being directly attached to the frame. It is characterized by being fixed.

[0005]

[Function] Since the amplifier part is fitted into the recess formed in the acoustic diaphragm, the panel speaker as a whole becomes thinner.Furthermore, since the amplifier part is directly fixed to the frame, undesirable stress is applied to the acoustic diaphragm. Therefore, it is possible to obtain a panel speaker with a built-in amplifier that is thin and has excellent acoustic characteristics, preventing deterioration of characteristics such as frequency characteristics and sound pressure level.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing the structure of a panel speaker according to an embodiment of the present invention as seen from the back side, FIG. 2 is a side view thereof, and FIG. 3 is a plan sectional view of an acoustic diaphragm. As shown in FIG. 3, the acoustic diaphragm 1 of the panel speaker of this embodiment is formed by combining two foamed resin plates 2a and 2b made of a foamed material such as modified polystyrene foam. is the dent 1 of the foamed resin board 2b
It is embedded in 6. Recesses 3 are formed at opposing positions on the opposing surfaces of the foamed resin plates 2a and 2b. A piezoelectric acoustic driver 4 is inserted into the recess 3, and a small protrusion 5 in the recess 3 generates vibrations. Center supported as possible. In addition, flat frames 7a and 7b made of metal, resin, etc. are attached via elastic bodies 13 to stepped portions formed on both sides of the acoustic diaphragm 1 on the side facing the panel speaker. There is.

Furthermore, a recess (notch) 14 is formed at the end of the acoustic diaphragm 1 to which the flat frame 7a is attached, and the recess 14 has an amplifier section 15 of the acoustic system. is inserted. The amplifier section 15 is directly fixed to the frame 7a by screws or the like (the flat frame 7a and the amplifier section 1
(The elastic body 13 is not inserted between the parts 5 and 5). A sheet 9 made of a material such as a resin sheet, nonwoven fabric, or woven fabric is attached from the back surface to the front edge of the acoustic diaphragm 1 formed in this way to improve the aesthetic appearance. However, the operation surface of the amplifier section 15 is exposed from the sheet 9 so that operations such as connection with the outside and setting of conditions are possible.

Further, frames 6a and 6b having a U-shaped cross section and made of metal, resin, etc. are attached to a pair of upper and lower opposing sides (long sides) of the acoustic diaphragm 1. It is attached to frames 7a and 7b with screws 8 (FIG. 2). Further, U-shaped frames 6a, 6b
Caps 10 are attached to both ends. In addition,
In order to generate good sound without hindering the vibration of the acoustic diaphragm 1, it is preferable not to forcefully press the front surface of the acoustic diaphragm 1 with the U-shaped frames 6a, 6b.

[0009] Also, on the front surface of the acoustic diaphragm 1, a transparent sheet 11 made of acrylic resin can be attached and removed by inserting its ends between the U-shaped frames 6a, 6b and the acoustic diaphragm 1. is installed on. A decorative object 12 such as a poster, which is approximately the same size as the transparent sheet 11, is inserted between the transparent sheet 11 and the acoustic diaphragm 1. It is held by frames 6a and 6b.

In the panel speaker configured as described above, since the amplifier section 15 is fitted into the recess 14 formed in the acoustic diaphragm 1, it is possible to make the panel speaker thin as a whole, and furthermore, Since the amplifier section 15 is directly fixed to the frame 7a, no stress is applied to the acoustic diaphragm 1. Therefore, it is possible to prevent deterioration of characteristics such as frequency characteristics and sound pressure level, and to obtain a panel speaker with a built-in amplifier that is thin and has excellent characteristics.

Further, in the panel speaker of the above embodiment, when attaching or replacing the decorative object 12 such as a poster, the cap 10 or the U-shaped frame 6 is used.
Without removing a and 6b, the transparent sheet 11 and the decoration object 12 are curved and the ends are attached to the U-shaped frame 6.
By inserting the decorative object 12 between the acoustic diaphragm 1 and the acoustic diaphragm 1, it is possible to attach and replace the decorative object 12 very easily.

[0012] In the above embodiment, a panel speaker has been described in which a U-shaped frame is attached to the upper and lower sides so that a decorative object can be easily attached and removed. However, the present invention is not limited in any way by the above embodiment. However, it is also possible to apply the present invention to a panel speaker as shown in the conventional example described above. In that case, the frame to which the amplifier section is fixed is not limited to the frame on the side side, but can also be fixed to frames attached to the upper and lower sides.

[0013]

[Effects of the Invention] As described above, in the panel speaker of the present invention, a recess in a shape corresponding to the amplifier section is formed in the acoustic diaphragm, and the amplifier section is fitted into the recess and is directly fixed to the frame. In addition to preventing the amplifier section from protruding and making the panel speaker thinner as a whole, the amplifier section is directly fixed to the frame and no undesirable stress is applied to the acoustic diaphragm, which improves frequency characteristics, sound pressure level, etc. It is possible to prevent deterioration of characteristics and achieve excellent characteristics. That is, according to the present invention, it is possible to obtain a panel speaker with a built-in amplifier that is thin and has excellent acoustic characteristics.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a panel speaker according to an embodiment of the present invention.

FIG. 2 is a side view showing the panel speaker according to an embodiment of the present invention with the cap removed.

FIG. 3 is a plan cross-sectional view showing an acoustic diaphragm of a panel speaker according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional panel speaker.

FIG. 5 is a side sectional view showing a conventional panel speaker.

[Explanation of symbols]

1 Acoustic diaphragm 2a, 2b
Foamed resin plates 6a, 6b Frame 7a with a U-shaped cross section,
7b Flat frame 12 Decorative object (poster) 14
Recess (notch) 15
Amplifier section

Claims (1)

[Claims] 1. A panel speaker comprising an acoustic diaphragm formed by disposing a piezoelectric acoustic driver on a foamed resin plate, an amplifier section, and a frame attached around the acoustic diaphragm, the panel speaker comprising: A panel speaker characterized in that a concave portion having a shape corresponding to the amplifier portion is formed in an acoustic diaphragm, and the amplifier portion is fitted into the concave portion and is directly fixed to the frame.