JPH02264600A - Production of speaker damper - Google Patents

Abstract

PURPOSE:To improve the linearity and to reduce the mechanical resistance by using a metallic mold divided in the damper radius direction to produce a speaker damper. CONSTITUTION:A metallic mold is divided into a top force 16 and a bottom force 17 and each of both forces is also divided for each corrugation toward the outer circumference from the center part and in the circular circumference direction of the mold. When a damper is formed with this metallic mold, a center metallic molds 4 and 5 are set to each other to clamp the inner circumference part of a base material 18 to be formed into the damper. A corrugation recessed metallic mold 6 rises up and then a corrugation projecting metallic mold 7 falls down. Thus a 1st corrugation is formed at the inner circumference part of the material 18. Then a corrugation recessed metallic mold 8 and a corrugation projecting metallic mold 9 move up and down for production of a 2nd corrugation. Hereafter the corrugations are successively produced in the same way toward the outer circumference. Thus, the force is applied evenly to any part of the damper which is produced in such a process since no excess force is applied to the damper at its molding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a speaker damper used in speakers used in various audio equipment and video equipment.

2. Prior Art A conventional speaker damper of this type is shown in FIGS.
It was produced using the molding method shown in C).

That is, as shown in FIG. 7(a), the molding die is divided into two parts, an upper mold 1 and a lower mold 2, and the base material cloth 3 is pressed from above and below as shown in FIG. 7(b). By molding in one press, a speaker damper 3' as shown in FIG. 7(C) was obtained.

Problems to be Solved by the Invention However, since conventional speaker dampers of this type are obtained by one press molding process, depending on the size and shape of the corrugation, For example, if an excessive force is applied to the fabric 3, the area where the force is applied is uneven, or the threads forming the fabric 3 are stretched in an unreasonable manner, the limit may be exceeded. Problems have arisen in that the material is destroyed due to excessive stretching, and sometimes the cloth 3 is torn.

In addition, the speaker damper 3' obtained in this way has poor linearity and large mechanical resistance because the fabric 3, which is the base material of the damper, remains from molding distortion, and has a large mechanical resistance. There were drawbacks such as deformation if left unattended. Also, speakers using such a speaker damper of 3° have poor linearity, just like a single speaker.
The mechanical resistance is high, and in terms of reliability, the acoustic characteristics and quality are high, such as the reduction rate of the lowest resonant frequency.
This had major problems in terms of both reliability.

The present invention solves these conventional problems and provides a damper for a speaker that has extremely high performance in terms of acoustic characteristics, quality, and reliability.

Means for Solving the Problems In order to solve the above problems, the present invention changes the production method of dampers used in speakers from the center of the corrugation to the outer periphery, instead of one press molding using upper and lower molds. Once per corrugation towards
In other words, this is a production method in which the molding is repeated as many times as there are corrugations.

Effect By adopting the above-mentioned structure, the resultant speaker damper is not subjected to excessive force during molding, the force is applied uniformly in all parts, and furthermore, the damper is not affected by the base material on the damper. Since the amount of retraction increases, molding distortion is also very small, so as a damper alone, the linearity is good and the mechanical resistance is small (and even if left unused, it does not try to return to the shape before molding). It has the advantage of not causing any deformation, and speakers using this speaker damper also have good linearity and low breakage resistance (also, in terms of reliability, there are effects such as a small rate of decline in Fo). There is.

In this way, the present invention improves acoustic characteristics and quality.

This makes it possible to provide a speaker damper that is extremely beneficial in terms of both reliability.

Example Embodiments of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, the molding die is divided into an upper mold 16 and a lower mold 17 as in the past, but the difference from the conventional method is that the molding mold is divided into upper and lower parts. Type 1
6. Each of the lower molds 17 is further divided into corrugations in the circumferential direction from the center toward the outer periphery.

The damper forming method using this mold is as shown in FIGS.
This is a molding method in which the material is pressed sequentially from the center toward the outer periphery. That is, the center molds 4 and 5 are first brought together to clamp the inner peripheral portion of a base material 18, such as cloth, which will become a damper. Next, the first corrugation convex mold 6 rises,
Next, the first corrugation concave mold 7 is lowered and the base material 18 is lowered.
A first corrugation is formed from the inner periphery of. Next, the second corrugation convex mold 8 and then the second corrugation concave mold 9 are moved up and down to form a second corrugation. Thereafter, in the same manner, the third. 4th corrugation convex mold 10°12, 3rd from peripheral mold 14
．． 4th corrugation concave mold 1.1, 13, peripheral mold 1
This is a production method in which corrugations are sequentially formed by step 5 to form a speaker damper 19 as shown in FIG.

In addition, as a simplified example of this production method, as shown in Fig. 5, the lower mold 17 of the upper and lower molds is not divided into one mold, and only the upper mold is machined by δ, and then the mold is removed. It is also possible to adopt a production method in which molding is performed in order from the mold 5 to the corrugation concave molds 7, 9, 11° 13, and the peripheral mold 15.

Furthermore, it is also possible to freely change the order in which the molds divided for each corrugation are moved in accordance with the required characteristics of the speaker damper.

The speaker damper obtained by this production method does not apply excessive force during molding, and the force is applied uniformly to all parts, so that molding distortion of the cloth that is the base material 18 is avoided. Since there is no residue left when the speaker damper 19 is molded, linearity is good, mechanical resistance is small, and deformation of the speaker damper 19 by attempting to return to its original shape does not occur even when left unused for a long time. It has many advantages.

As shown in FIG. 6, an example of a speaker using this speaker damper 19 includes a magnet 1-22, an upper plate 23. A frame 25 is bonded to the magnetic circuit made of the lower plate 24, and a magnetic gap 27 of the magnetic circuit is bonded to the diaphragm 26 bonded to the peripheral edge of the frame 25.
The voice coil 28 that fits into the damper 19 of the present invention
The diaphragm 26 is centered and joined together, and two dust caps are bonded to the center of the front surface of the diaphragm 26. And, like the damper alone, this speaker has good linearity, low mechanical resistance, and flexible movement, so it has very good sound quality. Furthermore, in terms of reliability, the damper uses more base material. Since it is drawn in, it has the advantage that the rate of decrease in the lowest resonant frequency is extremely small.

Effects of the Invention As described above, the present invention has a manufacturing method for speaker dampers that uses molds that are divided in the radial direction of the damper, thereby applying force uniformly to all parts without applying unreasonable force. Furthermore, since the material is molded with a large amount of material drawn in, there is no deformation when the damper is left alone (Also, speakers obtained using this damper have improved linearity and mechanical resistance like the damper alone Furthermore, from the viewpoint of reliability, it is possible to improve the Fo reduction rate.

In this way, the present invention improves acoustic characteristics, sound quality, and quality.
Since it is possible to provide products with extremely high performance in terms of reliability, its industrial value is extremely large.

[Brief explanation of drawings]

FIG. 1 is a structural cross-sectional view of a production mold used in a method for manufacturing a speaker damper according to an embodiment of the present invention, FIGS. 2 and 3 are structural cross-sectional views showing the manufacturing method, and FIG. 4 is a structural cross-sectional view showing the method. FIG. 5 is a structural IM view showing another production method, FIG. 6 is a structural cross-sectional view of a speaker using the speaker tamper of the present invention, and FIG. (a) to (c'+ are structural cross-sectional views showing conventional production methods. 4.5... Center mold, 6.s, 10.12...
... Corrugation convex mold, 7, 9, 11.13.
...corrugation concave mold, 14.15...
... Peripheral mold, 16 ... Upper mold, 17 ...
- Lower mold, 18...Base material. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 3 Figure 4 Cause? 7 Ward

Claims (2)

[Claims] (1) A base material made of a sheet of cloth impregnated with synthetic resin or a synthetic resin film is placed in a heat-forming mold, and after fixing the center of the sheet with this heat-forming mold, the sheets are sequentially moved from the center to the outer periphery. A method of manufacturing a speaker damper characterized by molding corrugations one by one. (2) A speaker using the speaker damper obtained by the method for manufacturing a speaker damper according to claim 1.