JPS6019398A - Manufacture of diaphragm for speaker - Google Patents

Abstract

PURPOSE:To obtain a diaphragm for a flat speaker with high performance and low cost by arranging an annular long tape among lots of moving pins arranged nearly annularly on a base plate, moving the moving pins toward the center and foring them into a prescribed shape with one process. CONSTITUTION:After an aluminum annular tape 10 is arranged so as to be positioned among the moving pins 8, 9 arranged alternately on upper face of the base plate 7, the shape of a core member for tweeter diaphragm having a required diameter is formed by moving the moving pins 8, 9 radially toward the center of the base plate 7 until a prescribed position at the same time. The length of the moving pins 8, 9 is made shorter than the width of the tape 10 in this case. Further, aluminum foil is heated and adhered onto the upper ridge of the tape 10 as a surface member by using a polyamide group film adhesives. Then the tape 10 is removed from the moving pins 8, 9 together with the surface member, and the surface member is adhered similarly on the other side so as to form the diaphragm.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for producing a diaphragm for a speaker, in which the diaphragm is a sandwich structure in which a surface layer is bonded to both sides of a core.

Conventional configuration and its problems It is ideal for the diaphragm of a speaker to vibrate as a piston over the frequency band used, but if the diaphragm deforms during vibration or split vibration occurs, the sound frequency characteristics and distortion rate 9 phase Characteristics etc. deteriorate and high fidelity endogeneity is lost. In order to solve these problems, recently a flat plate diaphragm made of a sandwich (tη structure) using aluminum honeycomb has been developed.
has been done.

Furthermore, as shown in Fig. 1, a tweeter diaphragm has been proposed in which a long tape 1 is woven in a radial pattern with a metal core, and a surface (A2.2') is pasted on both sides. As shown in FIG. 2, the radial tape 6 used in the diaphragm of the diaphragm has a plurality of vials 4 and the substrate 3 implanted in a small diameter inner circumferential circle centered at one point on the substrate 3.
A plurality of pin SVC long tapes 1 planted on a large diameter outer circle of pin 4. It is manufactured by knitting it in a radial pattern, one by one in each bottle, which is extremely difficult to manufacture, and has many drawbacks that make it expensive.

In addition, in the conventional manufacturing method, the tension varies when applying the tape to each pinot tree, and the material tape loosens or stretches, causing the length of the tape used as a gutter to change, resulting in weight loss. Also, there was a drawback that variations in tension occurred, resulting in changes in acoustic characteristics. Therefore, stable diaphragm characteristics': Jc? ! ) was a difficult thing to do.

1.1 The purpose of the present research is to provide a method for manufacturing a diaphragm for a flat speaker with high performance and low cost by eliminating the above drawbacks. be.

Structure of the Invention The present invention is based on the aluminum Uno 8. A long tape made of a sheet made of metal foil such as titanium, plastic film such as polyethylene terephthalate, polyarylate, etc., and natural fiber 1 synthetic fiber alone or in a mixed manner is alternately folded on the center side and the outer peripheral side of the diaphragm. A Zandwich structure using a radial body is used as a diaphragm, and in particular, as a manufacturing method for 6-pins, a long tape is placed in a ring shape between a large number of movable pins arranged approximately in an annular shape on a substrate. This method involves moving a movable pin toward the center and forming it into a predetermined shape in one step, which significantly reduces the number of man-hours compared to the conventional method of applying tape to a fixed pin one by one. This allows cost reduction while maintaining performance.

Description of Examples IJ, F Manufacture of the Invention; Notification Method - Third Example
This will be explained using FIGS.

Aluminum glue/glue tape (approx. 27 on' in diameter)
.

After arranging 1o (thickness 2477m, width 0, 9mm) so as to be located between iiJ moving binobi/8 and 9 arranged crosswise to -1 and ff of the board 7 as shown in Fig. 3. , each i, i
As shown in Fig. 4, the pivot pins 8 and 9 are moved in the radial direction toward the center of the plate 7 to the predetermined position shown in Fig. 5 at the same time. The tweeter diaphragm is formed into a circular shape.At this time, the length of the ijJ moving pin 8.9 is made shorter (approximately 0.7 mm) than the width (o, 9 mm) of the tape 10. h
Aluminum foil (20 p m,
2s in diameter) i Heat adhesive using a polyamide film adhesive. Tape 1o on the thorns and remove the movable pin 8 while removing the surface.
．． 9 and adhere a surface material to the other side in the same way to form a diaphragm.

Effects of the Invention In the conventional method of manufacturing lumber, long tapes are alternately hung one by one on fixed pins and woven in a radial pattern, as shown in Figure 2. There was a drawback that the length of the tape used for each core (A) varied because the material tape loosened or stretched due to variations in the length as it was being drawn.However, according to the method of the present invention, it is possible to Molding a long tape of a certain length 6
Because it is made of aluminum, there is little variation in the amount of
Furthermore, the tension of the tape can be evened out, resulting in stable performance as a diaphragm.

In the present invention, a long tape previously formed into a ring shape is set at V'C so as to pass through the inside and outside of a large number of movable pins that are movable in the radial direction toward the center of the table.
After installation, the movable pins are moved toward the center at the same time and molded into a predetermined shape in one step, so the number of man-hours and costs can be reduced significantly compared to the conventional manufacturing method described in M'+1. This is something that can be achieved.

Furthermore, the same effect can be obtained by using a ring-shaped tape other than aluminum, which was used in the embodiment. For example, metals such as titanium foil,
Polyethylene terephthalate 1.

Plasti, tsuku and natural fibers such as polyarylates.

It may be made of synthetic fibers alone or in a mixture of /-1. In addition, by changing the position of the movable pin that moves not only in Z-turns (the pattern of E is shown in the example),
You can change it freely. Furthermore, the size of the diaphragm is not limited to tweeters, but can also be applied to large squawkers and Uno diaphragms.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a diaphragm made from 6 strips of long tape, and Figure 2 shows the manufacturing method of a conventional diaphragm.
3, 4 and 6 are seven views sequentially showing the manufacturing method in one embodiment of the present invention. 1... Long deso, 2, 2'... Koroyama white 4.7... J mountain board, 8, 9... Operating pin, 10... ...Dezo. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 1θ Figure 4 Figure 5

Claims (1)

[Claims] Manufacture of a speaker diaphragm with a sandwich structure in which a long tape is alternately folded at the center and outer periphery of the diaphragm and arranged radially as the core material, and surface strips are bonded to the upper and lower edges of the tape. In this method, a long tape previously formed into a ring shape is moved radially toward the center of the board and placed between a large number of ijj movable bins arranged in a ring shape, and then the movable bins are moved between the movable bins on the board. A method of manufacturing a speaker diaphragm, which comprises moving the tape toward the center and knitting the tape radially to produce a core material.