JP3455876B2 - Speaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various audio equipments, more specifically, a speaker assembly.
It is possible to improve the defect rate and cost reduction during mounting work.
Speaker .

[0002]

In general, when fixing the edge of the diaphragm to the frame, cormorants I do not deviate from the simple frame fixed edge by the vibration of the diaphragm, the product layer cardboard, cork, press punching, such as synthetic rubber Or a molded gasket is used.

At this time, in addition to maintaining and protecting the shape of the outer peripheral portion of the diaphragm, in order to improve the appearance by contacting with a cabinet which is a mounting board, a base portion made of spiral or laminated paper, and a sponge-like member. EVA
There is known a configuration in which a cushion portion formed of a cushion material such as (ethylene / vinyl acetate copolymer) is attached with an adhesive or the like to suppress generation of abnormal sound.

As one of such techniques, for example, in Japanese Patent Laid-Open No. 4-223699, a gasket made of a thermoplastic synthetic resin is adhered to the entire outer peripheral portion of the frame,
Further, in a speaker in which a layer made of a foam made of thermoplastic synthetic resin is formed on the front side of the gasket, in a gasket portion of a speaker in which a layer made of a foam is formed by spot welding the gasket and the foam. An assembly method is disclosed.

[0005]

The method for assembling the gasket described in the above-mentioned patent publication discloses a high-frequency electrode having a spot-shaped tip at a plurality of locations from the front of the foam placed on the gasket. Since high frequency power is applied between the contact and the back electrode to heat and fuse by utilizing the dielectric loss, a special device for using high frequency is required, and there are parts where spot welding is not performed. However, it is difficult to improve the strength of the bonded surface, the bonded surface is easily peeled off, and there are many problems to be solved, such as the need to manufacture the gasket and the foam separately.

In view of the above situation, the present invention uses a gasket in which a base portion and a cushion portion provided on the base portion are integrally formed by two-color molding using different materials, and a gasket manufacturing process is performed. Reduction of
And improving the defect rate during speaker assembly work and reducing costs.
The purpose is to provide a speaker that can be turned on.

[0007]

To achieve the above object, according to an aspect of the speaker of the invention includes at least the diaphragm, and a frame for mounting the <br/> diaphragm, magnetic for driving said vibrating plate The gasket includes a circuit and a gasket that attaches the outer peripheral edge of the diaphragm to the frame, and the gasket is a relatively hard thermoplastic synthetic resin located on the frame side that fixes the outer peripheral edge of the diaphragm. From
A base portion comprising, an elastomer is provided on the base portion on
It is characterized in that is obtained by integrally formed by two-color molding a cushion portion made of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a speaker, which is a frame 11 and a magnetic circuit 1 attached to the frame 11.
2, a damper 14, a diaphragm 15, a gasket 16 and the like.

The frame 11 is integrally formed of a metal or ABS resin having heat resistance into a substantially flat elliptic cylinder shape with a widened head side, and a magnetic circuit mounting portion is provided on the bottom side. A front plate portion 17 having an approximately rectangular outer shape is integrally formed at an end portion of the frame 11 on the side of the expanded head portion, and further, from an outer peripheral portion of the front plate portion 17, an edge portion 18 is formed. Has been launched. A terminal (not shown) is provided on one side of the frame 11.

The magnetic circuit 12 has a bottom yoke 22 fixed to a magnetic circuit mounting portion of the frame 11 and an annular magnet 23 arranged around a pole portion 22a provided at the center of the bottom yoke 22. And an annular plate-like plate 24 fixed to the head side of the magnet 23
And a voice coil 25 arranged in a gap between the pole portion 22a and the plate 24. The voice coil 25 includes a cylindrical bobbin 27 around which a winding wire 26 is wound. , Is connected to the damper 14 connected to the outer peripheral portion and is held at a predetermined position.

A lead wire 26 constituting the voice coil 25.
Both ends of are attached to the tinsel wires, and these tinsel wires are respectively connected to the pins of the terminal. If necessary, a center cap is attached to the head of the bobbin 27.

The vibrating plate 15 has a substantially conical shape, and a central portion having a circular hole shape is connected to the bobbin 27 of the voice coil 25, and a pleated edge 15 is provided on a substantially elliptical outer peripheral portion.
a is integrally or separately provided, and the outermost peripheral portion of the edge 15a is fixed by using the gasket 16, that is, between the front plate portion 17 of the frame 11 and the gasket 16.

As shown in FIGS. 1 and 2, the gasket 16 has a rectangular sheet shape, and an elliptical opening 31 corresponding to the shape of the diaphragm 15 is formed in the center. In addition, through holes 32 for mounting are formed near the four corners, respectively.
As shown in FIGS. 1 to 4, a base portion 33 made of a thermoplastic synthetic resin such as ABS resin and a cushion portion 34 made of a soft elastomer are integrally formed by two-color molding by injection. ing.

More specifically, for example, a relatively hard polystyrene (HI) molded in advance with a mold of a predetermined shape is used.
-PS) base part 33 is placed in a mold having a predetermined shape, and a polystyrene elastomer forming a cushion part 34 by an injection molding machine and a polystyrene foaming agent are placed in the mold. Inject the base 33
The cushion portion 34 is formed in a state of being integrated with. At that time, the addition ratio of the foaming material to the elastomer is 10%, but it may be slightly changed in the molded state.

The loudspeaker 10 thus constructed is attached to the mounting board constituting the cabinet, that is, the mounting plate 36 by being pressed from the back side in the direction of arrow A shown in FIG. Then, in this state, the diaphragm 1
5 is opposed to the opening 37 provided in the mounting plate 36, and the surface of the gasket 16 on the cushion portion 34 side is in close contact with the back surface of the mounting plate 36.

As described above, according to this embodiment, since the gasket 16 which is a so-called cushioned gasket having a two-layer structure in which the soft cushion portion 34 is provided on the upper surface of the hard base portion 33 is used, Cone edge 15
a protective and shape maintenance can be performed more reliably, and the speaker 10 is brought into close contact without a gap in the mounting plate 36 it is possible to enhance the appearance, to absorb vibration, also to suppress such loosening of screws, abnormal The sound can be suppressed.

Further, since the gasket 16 is integrally formed by two-color molding using injection-molded polystyrene (PS) and an elastomer to which a foaming material is added, compared with a construction in which punched paper or sponge is bonded. The number of manufacturing steps can be reduced, the strength can be easily improved, problems such as peeling can be suppressed, and the defect rate at the time of mounting the speaker 10 on the mounting plate 36 can be improved.
Since the material can be efficiently used, the manufacturing cost of the gasket 16 and the speaker 10 using this gasket can be reduced.

It is sufficient that the cushion portion 34 has a thickness capable of absorbing vibration, and if the thickness dimension is too large, the cushion portion 34 is bent and the mounting work becomes complicated. The ratio between the thickness and the thickness of the base portion 33 is 10: 1 to 1:10. Since this ratio is related to the hardness of the elastomer used, it can be set arbitrarily. However, if the cushion portion is thickened, it may bend when tightening the screw. Therefore, as shown in FIG.
By so doing, it is possible to achieve both suppression of abnormal noise and ease of installation work.

In each of the above-mentioned embodiments, the frame 11, the magnetic circuit 12, the damper 14, the diaphragm 15 and the like can have various configurations and shapes. For example, the frame 11 is made of ABS resin, vinyl chloride. Besides synthetic resin such as resin or polyethylene resin, one or both of them may be made of metal such as aluminum and zinc, or other material.

[0020]

Further, according to the speaker of the present invention,
The gasket with the cushion part provided on the base part by color molding allows the diaphragm to be attached to the frame. When this speaker is attached to another member, the other member and the gasket can be easily brought into close contact with each other. The generation rate of defective products can be suppressed, and the manufacturing cost can be reduced.

[Brief description of drawings]

1 is a cross-sectional view of a part showing an embodiment of a speaker according to this inventions.

FIG. 2 is a plan view of a gasket used in the present invention .

FIG. 3 is an end view of the same gasket.

FIG. 4 is a sectional view of the same gasket.

FIG. 5 is a cross-sectional view showing another form of the gasket used in the present invention .

[Explanation of symbols]

10 speakers 11 frames 15 diaphragm 16 gasket 33 Base 34 Cushion

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 101 H04R 7/22

Claims (4)

(57) [Claims] And 1. A least diaphragm, comprised of a frame for mounting the diaphragm, a magnetic circuit for driving the diaphragm, a gasket for attaching the peripheral edge portion of the diaphragm to the frame The gasket is composed of a base portion made of a relatively hard thermoplastic synthetic resin located on the frame side for fixing the outer peripheral edge portion of the diaphragm, and an elastomer provided on the base portion.
Speaker, characterized in that is obtained by forming integrally the composed cushion unit by two-color molding. 2. The speaker according to claim 1, wherein the base portion is polystyrene. 3. The speaker according to claim 1, wherein the cushion portion is formed by adding a foam material to an elastomer. Wherein said cushion portion, with respect to the base portion, a speaker according to any one of claims 1-3, characterized in that the thickness is at least 1/3.