JPH0279700A - Plane speaker - Google Patents

Abstract

PURPOSE:To attain a stable high-rank feeling by spreading mesh cloth or lenticel cloth covering almost entire plane of the surface of the diaphragm of a plane speaker. CONSTITUTION:The diaphragm 1 consists of a foam resin plate made of formed styrol or foamed polyethylene, etc., and piezoelectric sounding bodies with a number possible to drive the diaphragm 1 essentially by adhering a metallic disk with a diameter larger than that of a pair of disks concentrically between the pair of disks consisting of piezoelectric ceramic such as PZT, etc., are adhered on the back plane of the diaphragm 1. After that, a cloth sheet 5 consisting of black mesh cloth or lenticel cloth whose upper and lower end parts are linked to a take-up shaft 60 and a detaining shaft 61, respectively is spread on the surface side of the diaphragm 1. In such a way, it is possible to make an observer image the stable high-rank feeling and to cause a superior interior function.

Description

[Detailed description of the invention] Rikuri Retired Emperor's skin ■ minutes! The present invention relates to a flat speaker that gives off a sense of luxury.

Conventional ■Focusing on the interior function of flat speakers, it has recently become popular to paste your favorite posters or designs on the surface of the speakers.

■ ("° Shiyotoru 1) However, when pasting posters or pictures, although it does increase fashionability, it gives the impression that it lacks a calm and luxurious feel.

The present invention has been made in view of the current situation, and it is an object of the present invention to provide a flat speaker that gives off a calm and luxurious feel.

The present invention is a planar speaker that acoustically drives a diaphragm made of a foamed resin with a piezoelectric sounding body or a thin voice coil attached to the back side or inside the diaphragm. It is characterized by having a mesh cloth or leather cloth covering almost the entire surface of the cloth.

When this happens, the mesh cloth or leather cloth stretched over the surface gives a sense of luxury to the viewer.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. Fig. 1 is a perspective view showing the front side of a flat speaker according to the present invention, Fig. 2 is a perspective view showing the back side thereof, Fig. 3 is a vertical sectional view of the main part, and Fig. 4 shows the detent mechanism. FIG.

This flat speaker includes a diaphragm 1 having a vertically long rectangular shape,
A frame-shaped frame 2 surrounds the periphery of the diaphragm 1 and supports the diaphragm 1, and a plurality of frames (5 in the illustrated example) are attached to the back surface of the diaphragm 1, and are driven acoustically. The basic structure includes a piezoelectric sounding body 3.

The diaphragm 1 is made of a foamed resin plate such as foamed polystyrene or foamed polyethylene. The manner in which the diaphragm 1 is attached to the frame 2 is as follows. That is, a structure in which a thin engaging protruding wall 1a formed on the back side of the diaphragm 1 is inserted into an engaging recess 2a formed in the inner peripheral edge of the frame 2, and in this state they are fixed together using an adhesive or the like. It has become.

The piezoelectric sounding body 3 is formed by adhering a metal disk of a larger diameter concentrically between a pair of discs made of piezoelectric ceramic such as PZT, and each piezoelectric sounding body 3 is connected to a lead wire. It is connected to an amplifier (not shown) via 4. Thus, when a predetermined electrical signal is applied from the amplifier to each piezoelectric sounding body 3 .

Note that the number of piezoelectric sounding bodies 3 is not limited to the number shown in the illustrated example, but may be any number that can substantially drive the diaphragm 1. Further, instead of being attached to the back surface of the diaphragm 1, it may be buried in a region near the back surface.

Furthermore, instead of the piezoelectric sounding body 3, a thin dynamic speaker structure incorporating a voice coil may be attached or buried, or a plurality of both may be attached or buried.

In addition, a cloth sheet 5 made of black mesh cloth or leather cloth is stretched over the front side of the diaphragm 1 to enhance the fashionability of the flat speaker and to create a particularly calm and luxurious feel. The width of the cross sheet 5 is selected to be slightly shorter than the left and right dimensions of the frame 2, so that it covers substantially the entire surface of the flat speaker when stretched. Stretching of the cloth sheet 5 is performed by a tensioning mechanism 6 provided on the back side.

This tensioning mechanism 6 includes winding shafts 60 provided in the left and right directions in a pocket 2b formed on the back side of the upper and lower end of the frame 2, which is formed in a downwardly sloping shape having a curved surface at the end. It consists of a locking shaft 61 and a detent mechanism 7 provided at both ends of the winding shaft 60 (only one side is visible in the drawing). The lower end bundle of the cloth sheet 5 is connected to the locking shaft 61, and the upper end of the cloth sheet 5, which is hooked upwardly through the front surface of the frame 2 and the diaphragm 1, is connected to the winding shaft 60. is concatenated. As shown in FIG. 4(a), the anti-rotation mechanism 7 includes a single-tooth ratchet 70 that is fitted and connected to the end of the winding shaft 60, and is supported at an appropriate position on the upper end of the frame 2. It consists of a lock pawl 71 that prohibits rotation in the direction of the arrow 70.

In this way, the cross sheet 5, whose upper and lower ends are connected to the winding shaft 60 and the locking shaft 61, respectively, is hooked and turned toward the surface side with slack, and from this state, the winding shaft 60 is rotated in the winding direction. When rotated, the cloth sheet 5 is rolled up and stretched. The lock pawl 71 that engages with the ratchet 70 maintains this tensioned state. When such a rotation prevention mechanism 7 is provided, the tensioning work can be carried out efficiently and the tensioned state can be maintained for a long period of time, which is advantageous in terms of aesthetics.

As shown in FIG. 3, guide grooves 2c (only one side is visible in the drawing) corresponding to the width of the cross sheet 5 are recessed in the upper and lower ends of the frame 2. This action allows the tensioning work to be carried out smoothly.

FIG. 4(b) shows a modification of the rotation prevention mechanism 7.

This modification adopts a structure in which a ratchet 73 having a plurality of teeth is prevented from rotating by a lock pawl 72 which has become swingable.

Although the entire details of the illustrated embodiment are as described above, the method of tensioning the cross sheet 5 is not limited to the above method. For example, the cross sheet 5 connected to the locking shaft 61 is stretched upward. In this state, pull the upper end of the cloth sheet 5 onto the shaft or frame 2 corresponding to the winding shaft 60.
It may be fixed to a predetermined location using instant adhesive or the like.

Further, the anti-rotation mechanism 7 is not limited to the structure described above, and for example, a draft-shaped locking member may be interposed between the winding shaft 60 and the corresponding portion of the frame 2, and this can be imitated. Therefore, a configuration may be adopted in which rotation of the winding shaft 60 in the loosening direction is prohibited.

In the case of the present invention described above, the surface side covered with the mesh cloth or the leather cloth is visible, giving the viewer an image of a calm and luxurious feel. Therefore, it exhibits excellent interior functions.

Furthermore, since it is a thin planar speaker, it naturally has the advantage of reducing installation space. Furthermore, since the diaphragm is made of lightweight foamed resin, the overall weight of the speaker can be reduced, and there is an advantage that the wall-mounted speaker can also be used as a casual speaker.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the front side of a flat speaker according to the present invention, Fig. 2 is a perspective view showing the back side thereof, Fig. 3 is a vertical sectional view of the main part, and Fig. 4 shows the detent mechanism. FIG. DESCRIPTION OF SYMBOLS 1... Vibration plate, 2... Frame, 2c... Guide groove, 3... Piezoelectric sounding body, 5... Cross sheet, 6...
... tensioning mechanism, 60 ... winding shaft, 61 ... locking shaft,
7... Rotation prevention mechanism. Patent applicant: Murata Manufacturing Co., Ltd. Hatake 1 Figure 3 Figure 2 Figure 4 (a) /

Claims (1)

[Claims] (1) A flat speaker that acoustically drives a diaphragm made of foamed resin with a piezoelectric sounding body or a thin voice coil attached to the back or inside, and covers almost the entire surface of the diaphragm. A flat speaker characterized by being covered with mesh cloth or leather cloth.