JPH11275690A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a defective junction when a film diaphragm formed by injection molding, etc., is fitted to the outer periphery of a frame, and also to prevent the deterioration of the sound quality of a loudspeaker caused by the junction defects. SOLUTION: A buffer member 22 such as a paper ring is stuck in advance to the rear surface of an outer peripheral edge section 2 of a film-like diaphragm 5 integrally formed with a film cone 10, a fixing edge 13, and an outer peripheral edge section 2 by injection molding, and a loudspeaker is obtained where a frame 7 is jointed via the diaphragm 5. Since the outer peripheral edge section 2 of the diaphragm 5 is not deformed and the diaphragm 5 is stable, the workability is markedly improved, when the outer peripheral edge section 2 is jointed to the largest-diameter opening 21 of the frame 7 via the buffer member 22, and the yield of the loudspeaker is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a speaker using a diaphragm formed by molding a sheet-like film.

[0002]

2. Description of the Related Art Conventionally, various speakers have been proposed for use as high-frequency tweeters, but FIG. 4 shows a general electrodynamic type tweeter.

In FIG. 4, reference numeral 20 denotes a small speaker for a tweeter as a whole. A yoke 4 constituting a magnetic circuit is made of a disk-shaped plate material, and is a column-shaped center pole planted in the center. 4a and a magnet guide 4b having a stepped portion formed concentrically so as to surround the center pole 4a. The yoke 4 has an inverted T-shaped cross section. A magnet 3 magnetized in the thickness direction in a joined ring shape, a ring-shaped plate 1 joined to the upper surface of the magnet 3 with an adhesive or the like, and a funnel-shaped steel or the like fixed on the plate 1. The frame 7 forms a magnetic circuit of a metal part.

In order to insert the voice coil 8a wound around the voice coil bobbin 8 into a concentric magnetic gap 17 between the center pole 4a and the plate 1, a spacer such as kraft paper is provided around the inner periphery of the voice coil bobbin 8. Is wound, the voice coil bobbin 8 is inserted into the center pole 4a from above, and the position of the voice coil 8a is
Set so that it is arranged inside.

A wavy concentric damper 9 is bonded with an adhesive or the like between the middle outer diameter portion of the voice coil bobbin 8 and the outer periphery of the bottom surface of the frame 7 and inserted into the inner diameter of the voice coil bobbin 8 after the adhesive is dried. The spacer 5 is removed, and a synthetic resin sheet-like film is molded in a funnel-shaped mold, or a diaphragm 5 in which the film-shaped cone 10, the fixed edge 13 and the edge outer peripheral portion 2 are integrally molded by injection molding or the like.
The inner peripheral portion of the diaphragm 5 is fitted to the outer diameter of the upper end portion of the voice coil bobbin 8 and joined, and the outer peripheral portion 2 of the diaphragm 5 which is the largest diameter portion is joined to the largest diameter opening 21 of the frame 7 with an adhesive. Furthermore, the arrow paper 12 is joined to the upper surface of the edge outer peripheral portion 2,
The outer peripheral portion 2 of the edge of the diaphragm 5 is fixed to the frame 7.

Further, the cap 14 is attached to the film cone 10
Or on the voice coil bobbin 8.

A lead wire from the voice coil 8a of the speaker 20 is connected to the input terminal 15 via a tinsel wire 16, and an audio signal is supplied to the voice coil 8a via the input terminal 15.

[0008]

According to the above-mentioned speaker, a diaphragm in which a cone-shaped film, such as a synthetic resin or the like, and a cone 10, a fixed edge 13 and an edge outer peripheral portion 2 are integrally molded using a funnel-shaped mold, for example. As shown in FIG. 5, which is an enlarged view of a portion A in FIG. 4, when the mold 5 or the injection molding is performed, the circumferential direction of the edge outer peripheral portion 2 and the width direction indicated by W are not flat but wavy. Is done. In particular, in the injection molding, the edge outer peripheral portion 2 and the like are formed extremely thin, so that deformation, undulation, and the like are large.

In such a deformation, since the film cone 10, the fixed edge 13 and the outer peripheral portion 2 are integrally formed with a thin sheet, a thermal distortion is generated in the outermost peripheral edge portion 2 of the diaphragm 5. It is thought that it is.

Therefore, even if the outer peripheral portion 2 of the diaphragm 5 is joined to the maximum diameter opening 21 of the frame 7 via the adhesive 19, a portion adhered to the maximum diameter opening 21 of the frame 7 And the vibration plate 5
Had the problem of distorting the sound quality of the sound.

An object of the present invention is to provide a speaker which solves the above-mentioned problems, and an object of the invention is to provide a speaker which has stable sound quality and which can be easily joined at the time of assembly. .

[0012]

The loudspeaker of the present invention comprises a buffer member provided between the outer peripheral portion of the edge of the diaphragm of the fixed edge type film formed by injection molding and the outer peripheral portion of the maximum aperture of the frame opening. is there.

According to the loudspeaker of the present invention, the bonding process is simplified by previously attaching a buffer member made of a ring-shaped paper or the like to the lower surface of the edge outer peripheral portion 2 of the diaphragm 5 to simplify the joining process and achieve uniform sound quality. Thus, a stable speaker can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a speaker according to the present invention will be described in detail with reference to FIGS. In the present invention, parts corresponding to the speakers shown in FIGS. 4 and 5 are denoted by the same reference numerals. FIG. 1 is a side sectional view of the peaker device of the present embodiment, and FIG.
FIG. 3 shows a plan view and a side view of the cushioning member.

In FIG. 1, reference numeral 20 denotes a speaker as a whole, a yoke 4 includes a disc-shaped portion made of a plate material such as pure iron,
A columnar center pole 4a erected at the center of the disc-shaped portion and a magnet guide portion 4b composed of a step formed in the disc-shaped portion concentrically with the center pole 4a are integrally formed. .

The ring-shaped magnet 3 magnetized in the thickness direction of ferrite or the like is bonded on the disc-shaped portion of the yoke 4 via an adhesive. The inner diameter of the ring-shaped magnet 3 is fitted and positioned in a step portion of a magnet guide portion 4b formed in a disk-shaped portion of the yoke 4.

A ring-shaped plate 1 is attached to the magnet 3.
To join. In this case, the gap guide is left inserted in the center pole 4a, and an adhesive is applied to the upper surface of the magnet 3, and the inner diameter of the plate 1 is inserted into the outer diameter of the gap guide and fixed. The plate 1 is made of pure iron or the like in a disk shape, and a voice coil 8a is formed in a magnetic gap 17 formed between the inner peripheral edge of the through hole and the outer diameter of the center pole 4a by a plate material having a through hole in the center. Will be arranged.

The metal part of the magnetic circuit is formed by fixing a frame 7 formed in a funnel shape of steel or the like to the plate 1, and the outer periphery of the center pole 4 a and the inner diameter of the magnet 3 are provided below the magnetic gap 17. A void 18a surrounded by is formed.

The voice coil 8 wound around the cylindrical voice coil bobbin 8 is provided in the magnetic gap 17 of the above magnetic circuit.
a, and the voice coil bobbin 8 is held via a breathable damper 9 having a corrugated corrugation capable of vibrating vertically.

The inner diameter of the damper 9 is bonded to the middle part of the voice coil bobbin 8 with an adhesive, and the outer diameter part is the frame 7.
Is bonded to the outer periphery of the bottom surface of Further, the diaphragm 5 is obtained by molding a synthetic resin sheet film with a funnel-shaped mold, or by integrally molding the film-shaped cone 10, the fixed edge 13 and the edge outer peripheral portion 2 by injection molding or the like.

In this manner, the diaphragm 5 in which the film cone 10, the fixed edge 13, and the edge outer peripheral portion 2 are integrally formed is joined to the maximum diameter opening 21 of the frame 7 on the side of the joint surface, that is, the edge outer peripheral portion 2 of the diaphragm 5. Ring-shaped cushioning member 2 on the back side
2 are bonded via an adhesive or an adhesive tape to obtain the diaphragm 5.

The buffer member 22 is shown in FIGS. 3A and 3B.
As shown in FIG. 3, a ring of paper or the like having an outer diameter and an inner diameter of the edge outer peripheral portion 2 or a plurality of arc-shaped members 22 formed by cutting the ring at a plurality of equal angles as shown in FIGS.
The buffer member 22 may be a, 22b, 22c, or 22d.

The inner diameter of the diaphragm to which the paper ring is attached is fitted and joined to the outer diameter of the upper end of the voice coil bobbin 8, and the outer periphery 2 of the diaphragm 5, which is the largest diameter of the diaphragm 5, is attached. As shown in FIG. 2 which is an enlarged view of a portion B in FIG. 1, the attached buffer member 22 is bonded to the maximum diameter opening 21 of the frame 7 with an adhesive 19, and the arrow paper 12 is further attached to the upper surface of the edge outer peripheral portion 2. The outer periphery of the diaphragm 5 is fixed to the frame 7 by bonding.

Further, the cap 14 is attached to the film cone 10
And on the voice coil bobbin 8
A lead wire from the voice coil 8a of the speaker 20 is connected to the input terminal 15 via a tinsel wire 16, and an audio signal is supplied to the voice coil 8a via the input terminal 15.

[0025]

Since the speaker of the present invention is constructed as described above, the deformation of the outer peripheral portion 2 of the diaphragm 5 is small and a stable diaphragm 5 can be obtained. The workability when joining the edge outer peripheral portion 2 via the buffer member 22 is greatly improved, and the yield is also improved. Furthermore, since the diaphragm 5 is joined to the frame 7 with the adhesive 19 and the cushioning member 22, there is no uneven bonding and the bonding strength is increased, so that a speaker with improved sound quality and characteristics of the speaker can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a speaker of the present invention.

FIG. 2 is an enlarged view of a portion B in FIG.

FIG. 3 is a plan view and a side view of a cushioning member used for the speaker of the present invention.

FIG. 4 is a side sectional view of a conventional speaker.

FIG. 5 is an enlarged view of a portion A in FIG. 4;

[Explanation of symbols]

2 ‥‥ Edge periphery, 5 ‥‥ diaphragm, 7 ‥‥ frame,
10 ‥‥ film cone, 13 ‥‥ fixed edge,
21 ° maximum diameter opening, 22 ° cushioning member

Claims (3)

[Claims] 1. A speaker comprising a buffer member disposed between an outer peripheral portion of an edge of a diaphragm of a fixed edge type film formed by injection molding or the like and an outer peripheral portion of a maximum aperture of a frame opening. 2. The loudspeaker according to claim 1, wherein said buffer member is made of a ring or a plurality of arc-shaped members having the same diameter as the outer peripheral portion of said edge. 3. The loudspeaker according to claim 1, wherein the buffer member is attached to an outer peripheral portion of an edge of the diaphragm.