JPH09154200A - Damper for speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the stiffness around the damper uniform by sewing a plain weave cloth being a damper raw material with machine sewing thread in a direction of 45 deg. with respect to warp and weft so as to considerably improve the bending strength in the circumferential direction. SOLUTION: A required size of plain weave cloth in which warp and weft are woven alternately is impregnated in a phenol resin and dried incompletely. A mount hole 2 is to be punched in the middle of the cloth to mount a voice coil bobbin in the hole. Thus, the machine sewing thread 4 is sewed in zigzag a direction of 45 deg. with respect to warp and weft from the inner circumferential part of the position of the mount hole 2 toward an outer circumferential direction. In this case, the machine sewing thread 4 with stiffness such as cotton thread or polyamide-made thread is desirable. Then the plain weave cloth is heated and press-molded entirely to form a corrugation concentrically and then the mount hole 2 and the outer circumference 5 are punched for the damper material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a speaker used in various audio equipments, and more particularly to a damper made of woven cloth and having high rigidity.

[0002]

2. Description of the Related Art In manufacturing a loudspeaker, a damper for performing proper holding and vibration of a diaphragm is generally made of a plain weave having a very simple structure in which warp yarns and weft yarns are crossed one by one. Has been done. However, in this plain woven fabric, as shown in FIG. 2, the directions ee ′ and ff ′ of 45 ° with respect to the warp yarn a and the weft yarn b are structurally weakened against bending in this direction. Although it is inexpensive, it causes vibration distortion of the diaphragm and deteriorates sound quality, and a gap defect due to rolling phenomenon occurs, but it has many problems.

In order to solve these problems, Japanese Patent Laid-Open No. 1-1
In Japanese Patent No. 23598, by molding a first material arranged radially and a second material arranged substantially orthogonal to the first material, the flexibility in the radial direction transmitted by the diaphragm is made uniform. A damper has been proposed that prevents the occurrence of vibration distortion. Further, in Japanese Patent Application Laid-Open No. 3-97398, the damper is composed of a radial direction thread and a circumferential direction thread, and the radial direction thread is a highly elastic thread and the circumferential direction thread is hard. Speakers have been proposed that achieve high fidelity reproduction and high linearity by using strong threads.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the damper described in Japanese Patent No. 598, a plurality of warp yarns are arranged in the central axis direction of the voice coil, and a plurality of weft yarns are arranged in a concentric direction with respect to the central axis. The diameter is set to the equivalent diameter, the maximum diameter part is regulated to the diameter corresponding to the maximum outer shape of the damper, and then this is sequentially cut at a predetermined portion, and then impregnated with a resin such as phenol, and then heat-formed to obtain a cross-sectional wavy shape. The manufacturing method is very special.

On the other hand, in the damper described in Japanese Patent Laid-Open No. 3-97398, a very soft elastic yarn such as a polyamide resin fiber yarn is used as the radial direction yarn, and a hard and strong yarn is used as the circumferential direction yarn. Since all of the dampers used are cloth materials other than plain weave cloth materials, there were problems in terms of productivity and problems to be solved in terms of practical use.

In view of the present situation, the present invention improves the rigidity in the circumferential direction by improving the rigidity in the 45 ° direction with respect to the warp and weft of the plain woven cloth material that has been conventionally used as a damper material. It is intended to provide a uniform speaker damper.

[0007]

In order to achieve the above object, the speaker damper of the present invention uses a plain woven cloth material in which warp yarns and weft yarns are orthogonal to each other, and the warp yarns and weft yarns of the damper base material are used. On the other hand, the sewing machine thread is sewn along the direction of 45 °.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the damper base material is basically made of a plain woven cloth material in which warp yarns and weft yarns are crossed one by one. In such a damper base material, the rigidity in the direction of 45 ° with respect to the warp thread and the weft thread is weaker in the direction of the warp thread and the weft thread, so that the rigidity in the circumferential direction of the damper base material becomes substantially uniform in the direction of 45 °. The sewing thread is sewn in like this. The cloth material in which the warp threads and the weft threads intersect at right angles is not necessarily limited to plain weave, and may be twill weave.

There is no particular limitation on the sewing thread sewn into the damper base material, but it is preferable to use a rigid sewing thread such as cotton thread or polyamide thread. Further, when sewing the sewing thread in the direction of 45 ° with respect to the warp thread and the weft thread, the shape and the width of the stitch are changed from the attachment hole formed at the center for attaching the voice coil bobbin toward the edge. For example, it may be sewn in a straight line shape, or may be sewn in a zigzag shape or a curved shape. Further, the sewing of the sewing machine thread to the damper base material is performed by sewing one sewing machine thread in the direction of 45 ° with respect to the warp thread and the weft thread, by sewing a plurality of sewing machine threads in parallel, or by using the sewing machine to be used. The sewing amount may be changed by changing the thickness of the thread. It is needless to say that the above items may be implemented alone or in combination.

The damper base material may be impregnated with a thermoplastic resin such as a phenol resin before or after sewing the sewing machine thread. Use a semi-dried product that is impregnated with a plastic resin, sew the sewing thread in the direction of 45 ° to the warp and weft, and then heat-mold the whole to concentrate the corrugation on the damper base material. It is formed into a damper.

[0011]

In the speaker damper of the present invention, the sewing machine thread is sewn into the damper base material made of the plain woven fabric material in the direction of 45 ° with respect to the warp thread and the weft thread, so that the strength of this portion against bending in the circumferential direction is improved. Can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker damper of the present invention will be described in detail below with reference to the accompanying drawings. The speaker damper 1 of the present invention shown in FIG. 1 is for holding a voice coil bobbin in a central portion formed by punching after impregnating a plain woven cloth material of a required size with a phenol resin and making it a semi-dried state. The sewing thread 4 is sewn in a zigzag manner from the inner peripheral portion of the position of the mounting hole 2 toward the outer peripheral portion at an angle of 45 ° to the warp thread and the weft thread, and then the plain woven cloth material is heated and heated. A corrugation is concentrically formed by pressure molding, and then the mounting hole 2 and the outer periphery 5 are punched out to form a damper base material 3.

[0013]

In the speaker damper of the present invention, the sewing machine thread is sewn into the damper base material made of plain woven fabric material so that the warp thread and the weft thread are oriented at an angle of 45 °. The strength against bending in the circumferential direction is significantly improved, the rigidity of the damper itself can be made uniform over the entire circumference, and as a result, rolling as a speaker can be suppressed and the f ₀ change rate can be lowered. .
Moreover, since a very common cloth material such as plain weave can be used, the production cost of the speaker can be reduced, and an excellent damper can be obtained by an extremely simple and easy means of sewing a sewing thread. Very practical in terms.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a speaker damper of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between warp yarns and weft yarns of a plain woven fabric material.

[Explanation of symbols]

 1 Speaker damper 2 Mounting hole 3 Damper base material 4 Sewing thread 5 Damper outer circumference

Claims (3)

[Claims] 1. A disk-shaped damper base material having a mounting hole for mounting a voice coil bobbin at a central portion thereof, wherein the damper base material is formed of a plain woven cloth material composed of warp threads and weft threads. 45 ° to warp and weft of material
A speaker damper characterized by sewing a sewing thread along the direction of. 2. The damper base material, when sewing the sewing machine thread along a direction of 45 ° with respect to the warp thread and the weft thread, the thickness of the sewing machine thread, the sewing position or the sewing amount of the sewing machine thread, 2. The speaker damper according to claim 1, further comprising a sewn shape or a combination of a plurality of these shapes which are changed to make the circumferential balance uniform. 3. The damper base material is characterized in that when sewing a sewing thread along a direction of 45 ° with respect to a warp thread and a weft thread, the sewing thread is sewn in a linear shape, a zigzag shape or a curved shape. The damper for a speaker according to claim 1.