JPH09261794A - Manufacture of diaphragm for speaker and metal mold used for the manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease sticking processes and improve adhesive strength by integrally molding the foamed rubber as an edge on a speaker diaphragm main body in the metal mold. SOLUTION: A nonpress diaphragm main body 15 is mounted on a movable bottom force 10b, and an outer peripheral tip part 15a is mounted projecting over a recessed part 10e. Then the foamed rubber 16 is properly arranged in a recessed part 10e of an edge molding lower force 10c, and a top force is lowered until a edge molding top force abuts against a stopper. At this time, a movable bottom force 10b and a movable top force 11b which clump the diaphragm main body 15 move back while pressing the diaphragm main body 15 slightly with their springs. The bottom force 10 and top force 11 are heated, so the foamed rubber 16 is foamed and expands to fill the gap formed of a projection part and the recessed part 10e, thereby clamping the diaphragm main body 15 by the edge. Thus, the foamed rubber which becomes the edge is integrally molded on the speaker diaphragm main body in the metal model to decrease sticking processes and improve the adhesive strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a speaker diaphragm for a speaker used in audio equipment and a molding die used in the manufacturing method.

[0002]

2. Description of the Related Art In recent years, heavy bass has been developed in the audio industry, and a non-press diaphragm having a large amplitude and little distortion is used as a speaker.

A conventional non-press speaker diaphragm and its manufacturing method will be described below.

FIG. 5 shows an example of a conventional speaker diaphragm, FIG. 6 is a side sectional view of the speaker, and 2 is a cone-shaped central hole 2 which is centrally connected to a voice coil bobbin.
A diaphragm body for a speaker having a, 1 is an annular edge adhered to the outer peripheral portion 2b of the diaphragm body 2, and the edge 1 is formed by molding foam rubber to reduce distortion. Therefore, the edge 1 and the non-pressed diaphragm main body 2 are joined by the adhesive 3 to form the speaker diaphragm.

The diaphragm 4 is connected to a voice coil bobbin 5 having a voice coil at a central hole 2a on the inner circumference, and the outer circumference is connected to a frame 6 connected to a magnetic circuit 7 composed of a plate and a magnet via an edge 1. The voice coil bobbin 5 coupled and inserted in the magnetic block of the magnetic circuit 7 is oscillated back and forth by a voice input signal input to the magnetic circuit 7, and the diaphragm 4 produces a sound.

[0006]

However, in the above-described conventional diaphragm for a speaker, since the material of the edge 1 is foamed rubber, it cannot cope with the solvent and the adhesive 3 is regulated so that the adhesive strength is weak. Further, a step of attaching the edge 1 and the diaphragm main body 2 was also required.

The present invention solves the above-mentioned conventional problems, and aims to improve the adhesive force and reduce the assembly process.

[0008]

In order to solve the above-mentioned problems, a method of manufacturing a diaphragm for a speaker according to the present invention comprises a step of filling a mold with foam rubber and a step of positioning a peripheral edge in the mold. A step of disposing the diaphragm main body on the mold, and a step of heating the mold to foam the foamed rubber and integrally molding an edge made of the foamed rubber so as to sandwich the peripheral edge of the diaphragm main body. Therefore, the step of attaching the edge and the diaphragm main body can be omitted, and since the edge holds the diaphragm main body, the joining force is improved and the quality and performance are stabilized.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises the steps of filling a foam rubber in a mold, and arranging a diaphragm main body so that a peripheral edge is located in the mold. A step of integrally molding an edge made of the foamed rubber so as to sandwich the peripheral edge of the diaphragm body by heating the mold to foam the foamed rubber, and bonding the edge and the diaphragm body together. Further, the vibration plate main body is sandwiched between the edges to improve the joining force, and the quality and performance can be stabilized.

According to a second aspect of the present invention, after the step of the first aspect is subjected to a step of pre-pressurizing the peripheral edge of the diaphragm main body to make the thickness uniform, an edge made of foamed rubber is integrally molded. It is intended to make the joining force of the edge to the diaphragm body uniform.

According to a third aspect of the present invention, a recess filled with foamed rubber forming an edge portion of the speaker diaphragm and the heated foamed rubber sandwich the peripheral edge of the diaphragm body. As described above, the split mold has a sandwiching groove portion having a space thicker than the thickness of the peripheral edge portion and sandwiching means for sandwiching the diaphragm main body, and the edge formed of foamed rubber has the diaphragm main body. It is designed to securely clamp the

According to a fourth aspect of the present invention, in addition to the structure of the third aspect, the clamping means for clamping the outer peripheral edge of the diaphragm body clamps the peripheral edge of the diaphragm body at a constant value. The thickness of the peripheral edge of the diaphragm main body is made uniform.

According to a fifth aspect of the present invention, in addition to the structure according to the fourth aspect, at least one of the split molds is provided with a sandwiching portion as a sandwiching means via a spring on a fixing portion of the die. The spring prevents excessive clamping force from being applied to the diaphragm body.

An embodiment of a method for manufacturing a speaker diaphragm according to the present invention will be described below with reference to FIGS.

(Embodiment) FIG. 1 is a sectional view of an essential part of a speaker diaphragm according to an embodiment of the present invention, and FIG. 2 is a sectional view for explaining a state of installation in the lower mold. Yes, Figure 3
Is a conceptual cross-sectional view of the mold, and FIG. 4 is a cross-sectional view for explaining the same molding state.

Referring first to FIG. 1, the molding die will be described. Reference numeral 10 is a lower die, and a movable lower die 10b and an edge forming lower die 1 are provided via a plurality of springs 10a provided on the circumference.
0c or the like, the edge molding lower die 10c is provided with an annular stopper 10d and an annular recess 10e protruding upward.

Reference numeral 11 denotes an upper die, which is composed of a movable upper die 11b via a plurality of springs 11a provided on the circumference, an edge forming upper die 11c, and the like. An annular convex portion 11d corresponding to 10e is provided, and an edge 17 is formed in a gap (holding groove portion) formed by the convex portion 11d and the concave portion 10e.

The movable upper mold 11b is provided with an annular clamping projection 11e for clamping the non-press diaphragm body 15 described later with the movable lower mold 10b.

Next, a method of manufacturing the speaker diaphragm of the present invention using the above mold will be described. Reference numeral 15 denotes a non-press diaphragm body, which is first mounted on the movable lower mold 10b. At this time, the outer peripheral tip portion 15a of the diaphragm body 15 is mounted so as to project above the recess 10e.

Next, the concave portion 1 of the edge forming lower die 10c.
0e is provided with the foamed rubber 16 as appropriate, press molding is started, and the upper mold 11 is lowered until the edge molding upper mold 11c comes into contact with the stopper 10d.

At this time, the movable lower mold 10b and the movable upper mold 11b holding the diaphragm main body 15 are respectively held by the springs 10.
By virtue of "a" and the spring 11a, the diaphragm body 15 is retracted while slightly pressing it.

Since the lower mold 10 and the upper mold 11 are heated, the foamed rubber 16 foams and expands, so that the convex portion 1 is formed.
The edge 17 is formed so as to sandwich the diaphragm body 15 by filling the gap formed by 1d and the recess 10e.

As described above, the movable lower die 10b and the movable upper die 11 with the spring 10a and the spring 11a interposed therebetween.
Since the diaphragm body 15 is clamped by b, by appropriately selecting the elasticity of the springs 10a and 11a, it is possible to clamp the diaphragm body 15 with a pressure that does not lose the non-pressing characteristics of the diaphragm body 15. Along with
The ring-shaped uniform thickness portion is formed on the outer circumference of the diaphragm main body 15 adjacent to the edge 17, and the volume density of the outer circumference becomes uniform, which contributes to stable performance variation and improves the appearance. Is also incidentally included.

Although the diaphragm main body 15 is not pressed in the above-mentioned embodiment, it can be applied as an efficient method for manufacturing a diaphragm for a speaker even if a general pressed diaphragm main body is used. It is a thing. Further, although not particularly shown in FIGS. 1 to 4 in the above embodiment,
Small holes and narrow grooves for degassing when the foamed rubber 16 is foamed are provided as needed.

[0025]

As described above, according to the method of manufacturing the speaker diaphragm of the present invention, the foamed rubber forming the edge is integrally formed in the speaker diaphragm main body in the mold,
It is possible to reduce the bonding process and improve the adhesive strength.

[Brief description of drawings]

FIG. 1 is a side sectional view of a speaker diaphragm, which is a main part of an embodiment of the present invention.

FIG. 2 is a side sectional view for explaining a state in which a diaphragm body, which is a main part of the lower mold, is installed.

FIG. 3 is a conceptual side sectional view of the mold.

FIG. 4 is a side sectional view for explaining the molding state.

FIG. 5 is a cross-sectional view of a conventional speaker diaphragm.

FIG. 6 is a side sectional view of the speaker.

[Explanation of symbols]

 10 Lower Mold 10a Spring 10b Movable Lower Mold 10c Edge Molding Lower Mold 10d Stopper 10e Recess 11 Upper Mold 11a Spring 11b Movable Upper Mold 11c Edge Molding Upper Mold 11d Convex 15 Vibration Plate Main Body 16 Foam Rubber 17 Edge

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:38

Claims (5)

[Claims] 1. A step of filling a foam rubber in a mold, a step of disposing a diaphragm main body so that a peripheral edge is located in the mold, and heating the mold to foam the foam rubber. A method of manufacturing a speaker diaphragm, comprising a step of integrally molding an edge made of foamed rubber so as to sandwich the periphery of the diaphragm body. 2. The method of manufacturing a speaker diaphragm according to claim 1, wherein the edge of the diaphragm main body is integrally molded after a step of preliminarily pressurizing the periphery of the diaphragm body to make the thickness uniform. 3. A concave portion filled with foamed rubber forming an edge portion of the speaker diaphragm, and a space thicker than the thickness of the peripheral portion so as to sandwich the peripheral portion of the diaphragm main body with the heated rubber. The molding die used in the method for manufacturing a speaker diaphragm according to claim 1, wherein the molding die has a sandwiching groove portion and has a sandwiching die that sandwiches the diaphragm body. 4. The molding die used in the method for manufacturing a speaker diaphragm according to claim 3, wherein the diaphragm main body is clamped by a constant value as the clamping means. 5. The molding die used in the method for manufacturing a speaker diaphragm according to claim 4, wherein at least one of the divided dies as a holding means is provided with a holding portion on a fixed portion of the die via a spring.