JPS59141899A - Magnet structure of planar drive type speaker - Google Patents

Abstract

PURPOSE:To obtain a stable planar drive type speaker of high quality by using a single magnet to form a monolithic structure of plural magnetic poles and plural spaces among the magnetic poles and thereofre securing high accuracy for both size of the spaces and the size related to the position of the space. CONSTITUTION:For a planar drive type speaker, the diaphragm 11 has oscillation in response to the intensity of the sound current supplied to voice coils 12 whthin fine groove part 11a of the diaphragm which is formed corresponding to a gap Z and a magnetic pole 9a formed to a magnet 9 with a prescribed interval. Thus an acoustic output is generated. The array of space Z formed among the poles 9a corresponding to the part 11a of a diaphragm 11 is obtained from a monolithic magnet 9. This facilitates easy holding of size accuracy as well as easy assembling work.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to the structure of a magnet for a planar drive type speaker.

More specifically, in a planar drive type speaker, the air gap between the plurality of magnetic poles formed by a plurality of magnets with different polarities can be used, for example, to create an anisotropic structure of one shape. The speaker was constructed, for example, as in one embodiment shown in FIG.

That is, 1 is a flat plate made of a magnetic material, and for example, a plurality of rod-shaped magnets 2 are spaced at a predetermined interval to create a predetermined magnetic field.
This is a mounting plate that is arranged to face each other with different polarities to form the same.

2 is a magnet. The stone 2 is, for example, in the shape of a square bar,
They are arranged on the upper surface of the flat plate 1 at predetermined intervals and fixed thereon. Furthermore, pole pieces 6 are attached to the upper surfaces of the magnets 2, respectively. 4 is a diaphragm, which functions as a diaphragm. The diaphragm 4 has a cross section formed in a substantially series of bell shapes corresponding to the upper surface of the magnet 2 and the air gap X formed by the plurality of magnets 2, and is covered over the entire upper surface of the stone 2. are doing. Reference numeral 48 denotes a narrow groove portion formed at the border of each bell portion 4b of the diaphragm 4. The narrow groove portion 4
A voice coil 5 is wound around inside a.

6 is a bellows-shaped diaphragm support member, which is connected to the flat plate 1;
The flat plate 1 is attached so that the entire periphery of the diaphragm 4 is held between it and the frame 7 constituting the member, and is stretched so as to be expandable and contractible in the vibration direction of the diaphragm 4.

Constructed as described above, the air gap X between the magnetic poles of the magnet 2
The diaphragm 4 vibrates in the direction of arrow A and generates an acoustic output by applying a sound current to the voice coil 5 wound around the narrow groove portion 4a of the diaphragm 4 disposed inside the diaphragm 4. In order to maintain the output performance and its quality, it is necessary that the gap between the magnetic poles formed by the plurality of magnets 2 and the narrow groove portion 4a of the diaphragm 4 correspond to the correct arrangement. That is, the pure groove portions 4a of the diaphragm 4 arranged in each gap Because it is configured by placing each in
It is extremely difficult to retain Mg, resulting in disadvantages such as unstable quality and increased man-hours.

Purpose of the Invention The present invention was invented to address the drawbacks of confinement, and in other words, a plurality of single poles and a plurality of gaps between the poles are integrally formed with one magnet. For example, an anisotropic ferrite magnet is constructed by integrally molding a number of magnetic poles and air gaps with a mold. The purpose of this invention is to provide a planar drive type speaker which is extremely easy to perform and which is of high quality and stable at a low cost.

Structure of the present invention A preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

8 is a flat plate consisting of a can and a column. 9 is a magnet. The magnet 9 is, for example, an anisotropic ferrite magnet, as shown in the example shown in FIG. 2 are formed in parallel in a groove shape. Thus, the ferrite stone 9 is positioned and fixed at a predetermined position on the upper surface of the handset 8 by means of adhesive or the like.

Reference numeral 10 denotes a pole piece installed on the upper surface of the plural &ii poles 9a of the ferrite-stone 9. Incidentally, a plurality of holes (not shown) penetrating the lower surface ml are formed at predetermined intervals like V on the bottom surface of each groove forming the gap 2 between the magnetic poles 9a of the ferrite magnet 9. Ru. 11 is a diaphragm. The diaphragm 11 has the function of a diaphragm. 12 is a narrow groove portion 11a of the diaphragm 11;
This is a voice coil that is stacked and wound around the Pi. 13 is a diaphragm holding member. The diaphragm holding member 13 is formed, for example, in a bellows shape, and is stretched between the flat plate 8 and the frame 14 so as to hold the entire circumference of the diaphragm 11, for example, as shown in FIG. . Reference numeral 11 denotes a frame body to which the flat plate 8 is fixed and each component is housed.

Effect of the present invention The planar dynamic speaker of the present invention having the above configuration has a magnet 9 with a %? The diaphragm 11 vibrates in accordance with the strength of the voice current applied to the voice coil 12 in the narrow groove portion 11a of the diaphragm covered in correspondence with the plurality of magnetic poles 9a formed at regular IVJ intervals and the air gap 2. In the planar mJ type speaker of the present invention, the air gap 2 between the plurality of narrow grooves 11a of the diaphragm 11 and the corresponding magnetic pole 9a is Since the arrangement is made up of a single pole 9a and a magnet 9 integrally formed with the gap Z'f, it is extremely easy to maintain the precision of the method. pole 9
The assembly work for making the gaps 2 of a correspond to each other is facilitated, and has a function that can be performed appropriately.

Incidentally, FIG. 4 is a perspective view showing another example of the structure of the magnet of the planar drive type speaker according to the present invention, in which the magnetic pole 15a and the gap 151) between the single pole 15a are arranged concentrically, so that, for example, It is integrally formed with a ferrite magnet 15, and has the same function as the one described above.

Effects of the present invention 1 Since the magnetic field structure is integrally formed by providing a plurality of single poles with a predetermined gap as desired in a single-shaped magnet, workability is improved, and the distance between the poles is improved. Q? The arrangement relationship of the voice coil of the diaphragm corresponding to the air gap can also be maintained with extremely high precision, making it possible to provide a high-performance, high-quality planar drive type speaker at a lower cost.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of a conventional planar layer VI type speaker equipped with a magnet. Fig. It is a perspective view showing one example. Fig. 4 is a perspective view showing another example of the structure of the magnet of the planar drive type speaker according to the present invention. 8... Flat root, 9... ...Magnet, 9a...
...Single pole, 11...Diaphragm, 12...
...Voice coil. that's all

Claims (1)

[Claims] In a planar drive type speaker in which a plurality of mutually different magnetic poles are arranged in parallel or concentrically at predetermined intervals with a plurality of air gaps, the plurality of magnetic poles and the air gaps between the magnetic poles constituting the magnetic field are formed in one shape. A structure of a magnet of a planar drive type speaker characterized by being integrally formed.