JPH059099U - Dynamic type acoustic parts - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the temperature rise of the speaker domain wall and voice coil. [Structure] By adopting a permanent magnet with a high coercive force and high residual magnetic flux density as the permanent magnet, it is assembled flat and a slit is provided on the outer periphery of the center pole formed into an umbrella shape to provide magnetic permeability. A speaker with a built-in circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dynamic acoustic component such as a speaker having a center pole provided with a slit for air circulation in the outer peripheral portion.

[0002]

[Prior Art]

 Conventionally, as shown in Fig. 4, a dynamic acoustic component (S ') such as a loudspeaker of this type has a cylindrical center pole (02) fixed to a lower plate (03b), and has an annular permanent magnet. The frame (08) is attached to the magnetic circuit (05) in which the (01) is incorporated into the outer magnet type and the annular magnetic gap (04) is formed between the annular upper plate (03a). , A structure in which a damper (010) having outer edges attached to the frame (08) and a diaphragm (011) are suspended in the magnetic air gap (04) so as to suspend the voice coil (09). Is.

[0003]

[Problems to be solved by the device]

 Therefore, in the conventional magnetic circuit of this type, since the domain wall around the magnetic gap is solid, the air circulation is poor, and the temperature of the voice coil vibrating inside the magnetic gap rises excessively. There was a problem that the allowable electrical input of the speaker was reduced due to the ease of variation, deformation, and rise in the temperature of the domain wall. Further, in such a magnetic circuit, it is difficult to provide a ventilation hole in the center pole, and there is a problem that the height cannot be reduced.

Therefore, in order to solve the problems of such a conventional magnetic circuit, the present invention adopts, for example, a neodymium magnet as a permanent magnet to assemble it flatly as a whole, and at the same time, to construct a domain wall and a voice. The upper plate is molded into an umbrella shape for the purpose of suppressing the temperature rise of the coil, and a slit is provided in the outer periphery of the upper plate to provide dynamic air flow for speakers such as a magnetic circuit. The purpose is to provide acoustic components.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiments. The present invention shows that the upper and lower end faces (1a), ( 1b) is closely attached to the lower surface (2a) of the umbrella-shaped center pole (2) and the inner bottom surface (3a) of the bowl-shaped yoke (3) to form a magnetic circuit (5) that forms an annular magnetic gap (4). In a dynamic type acoustic component (S) such as a speaker provided with), a speaker having a structure in which a plurality of slits (6), (6) are radially provided on the outer periphery of the center pole (2), etc. It is a dynamic type acoustic component (S) of.

[0006]

[Action]

 Since the present invention has such a structure, the magnetic air gap (4) formed in the magnetic circuit (5) passes through the slit (6) of the center pole (2) to prevent outside air from flowing. Since it can be moved in and out, it has good air permeability, and the domain wall of the magnetic gap (4) suppresses the temperature rise due to Joule heat of the voice coil (9), and the voice coil (9) keeps an excessive temperature rise when in use. , Can be prevented. As a result, not only is it convenient for increasing the allowable input of the speaker (s), but also its finished height is small, the outer shape can be made compact, and the space factor can be improved.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 are views showing one embodiment of the present invention by taking a dynamic speaker as an example, FIG. 1 is a cross section thereof, and FIG. 2 is a II-II cross section of FIG. 3 shows the III-III cross section of FIG. 1, respectively. (1) is, for example, a short-cylindrical permanent magnet such as a neodymium magnet, the upper end surface (1a) of which is closely adhered to the lower surface (2a) of the umbrella-shaped center pole (2) and the lower end surface (1b) of which is bowl-shaped. A magnetic circuit (5) is formed by closely adhering to the inner bottom surface (3a) of the shaped yoke (3) and forming an annular magnetic gap (4). A plurality of slits (6), (6) ... Which pass through the upper and lower surfaces of the center pole (2) are radially provided on the outer periphery of the center pole (2) and, if necessary, a bowl shape. Ventilation holes (7), (7) ... Are formed in the bottom surface of the yoke (3) at positions corresponding to the slits (6). In (S), the frame (8) is attached to the magnetic circuit (5) having such a structure, and the outer edge of each is suspended so that the voice coil (9) is suspended in the magnetic gap (4). A speaker (S) having a structure supported by a damper (10) attached to the frame (8) and a diaphragm (11). The neodymium magnet has a large coercive force, which allows the height to be reduced. Therefore, the speaker (S) is thinly finished, and the residual magnetic flux density is high, so that the cross-sectional area can be made small, but it has similar magnetic properties. Similar effects can be obtained with other permanent magnets. It is magnetically desirable that the height of the center portion of the center pole of the center pole (2) be at least twice the length of the magnetic gap (4).

The structure of the present invention can be applied to other acoustic components such as a dynamic microphone in addition to the above-described speaker to obtain the same effect.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments, and is provided with the above-mentioned structural requirements of the present invention, and The present invention can be carried out with appropriate modifications within the scope of achieving the object of the present invention and having the following effects.

[0011]

[Effect of the device]

 As is clear from the above description, according to the present invention, since the voice coil (9) vibrates in the magnetic air gap (4) which easily communicates with the outside air, the temperature rise is suppressed by the above structure. Therefore, even if a large input is applied, the adhesive will not deteriorate due to heat and the adhesive will not distort, and the shape will not be deformed. Therefore, the allowable input can be significantly increased. It is possible to expect the above remarkable effects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view of a conventional speaker.

[Explanation of symbols]

 (1) Permanent magnet (1a) Upper surface (1b) Lower surface (2) Center pole (2a) Lower surface (3) Bowl-shaped yoke (3a) Inner bottom surface (4) Magnetic air gap (5) Magnetic circuit (6) Slit (7) Ventilation hole (8) Frame (9) Voice coil (10) Damper (11) Vibration plate (S) Dynamic type acoustic component

Claims (1)

[Claims for utility model registration] [Claim 1] The upper and lower end faces (1a) of the short column-shaped permanent magnet (1),
The magnetic circuit (1b) is attached to the lower surface (2a) of the umbrella-shaped center pole (2) and the inner bottom surface (3a) of the bowl-shaped yoke (3) to form an annular magnetic gap (4). In the dynamic acoustic component (s) including 5), a dynamic acoustic component having a structure in which a plurality of slits (6), (6) are radially provided on the outer peripheral portion of the center pole (2).