JPH0267100A - Manufacture of diaphragm for speaker - Google Patents

Abstract

PURPOSE:To improve dimension stability after molding by eliminating the influence of a room environmental condition on temperature management at the time of the molding by vapor-depositing an organic macromolecule on a molding jig, coating a voice coil at the time of forming an organic macromolecule film by vapor-deposition, then, unifying them. CONSTITUTION:A diaphragm is formed by the vapor-deposition by using the organic macromolecule, and junction with the voice coil, a lead wire, and an outer peripheral fixing ring is performed simultaneously at the time of performing the vapor-deposition and molding. For example, diparaxylene is vapored in an evaporation furnace, and it is heat-decomposited to paraxylene in a cracking furnace at the next process, and the organic macromolecule film 2 of polyparaxylene is vapor-deposited and generated on the surface of a diaphragm molding jig 1a and the voice coil 3 in a vapor-deposition room in which the combination of the molding jig 1a and the voice coil 3 is arranged, and the vapor-deposition is stopped at a time when thickness of around 6mu is formed, and the molding jig 1a is taken out of the vapor-deposition room, and is cut and removed, then, the assembly 4 of the diaphragm and the voice coil can be obtained. In such a way, the dimension stability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a speaker diaphragm used in the field of audio equipment and video equipment.

Conventional technology Conventionally, speaker diaphragms were made of plastic film J, (-
(Polyester film is used for boat fishing) was manufactured by heat forming or vacuum forming after heating.
The outer periphery of the part to be molded is fixed with a jig, either continuously or cut into a specific shape such as a square, and the inner periphery of the jig is heated, and when it is ready to be molded, the mold is removed. The desired shape was obtained by pressing or vacuum forming, and then unnecessary portions were cut and removed to form a diaphragm. When storing them, they were stacked in a specified number and packed in boxes. Next, the diaphragm 11 and voice coil 1
2 or the outer circumferential fixing ring 13 of the diaphragm 11 is bonded with a rubber adhesive or the like, and if necessary, the diaphragm 1
1, the outer circumferential fixing ring 13, and the lead wire 14 of the voice coil 12 were bonded along the diaphragm 11 and the outer circumferential fixing ring 13 with an adhesive 15 such as a rubber type, thereby forming a vibration system component for a speaker. The sectional view and plan view are shown in Figure 13 and 1.
Shown in Figure 4.

Problems to be Solved by the Invention The color speaker diaphragm made of polyester film (polyethylene terephthalate film I') that has been used in the past can be molded by heating it at a temperature above its softening point by taking advantage of its thermoplastic properties. When the desired shape was reached, pressure molding was performed using a mold at room temperature to obtain the desired shape. However, temperature control during heating of the film requires a film thickness of 6.
In the case of a thin one of ~6 μm, it was extremely difficult.

If the heating time is long or the temperature is high, it melts quickly, and if the heating time is short and the temperature is low, molding defects occur. In particular, this molding was highly influenced by indoor environmental conditions. Furthermore, since a stretched film is used, the dimensional stability of the diaphragm after molding is poor, especially when
When forming a thin film of 6 μm, it is easily deformed, the defective rate is high, and in addition, the frequency characteristics after the speaker is completed are unstable.

Also, during assembly, thin films of 6 to 6 μm are difficult to handle, have adhesion properties due to static electricity, are difficult to detect even if two or more are overlapped, and exhibit tingling or frequency characteristics. There were problems such as the occurrence of defects.

Furthermore, the voice coil 12 or the outer peripheral fixing ring 13
Also, in the case of bonding the voice coil lead wire 14 with the adhesive 16, conventionally a rubber-based adhesive has been used, and there have been problems such as poor bonding or poor frequency characteristics due to variations in the amount of application. .

Means for Solving the Problems In order to solve the above problems, the present invention uses an organic polymer (polyparaxylylene, polymonochloroparaquinrylene, polydichloroparaxylylene, etc.) to form a diaphragm by vapor deposition. Using a working organic polymer, a speaker diaphragm was vapor-deposited and molded under certain conditions, which may have been used to simultaneously bond the voice coil, lead wire, and outer fixing ring during molding. By simultaneously bonding the voice coil, lead wire, and outer circumferential fixing ring, the difficulty of controlling the heating conditions during film forming, which has been a problem in the past, is eliminated, and the film itself has no directionality, resulting in dimensional stability. The diaphragm is bonded to other components, eliminating the handling difficulties associated with thin films, and even the voice coil or lead wire.

It is no longer necessary to use adhesive to join the outer fixing ring, and the weight can be stabilized, making it possible to obtain a good speaker diaphragm, and also as a speaker with stable frequency characteristics and quality. can get things.

Example Examples of the present invention will be described below.

(Example 1) Divaraquinrylene (dimer) was evaporated in an evaporation furnace (176°C).

1 TORR) and then transferred to the next step, a decomposition furnace (680°C).
.

Paraxylylene (monomer) was thermally decomposed at a temperature of 0.5 TORR), and then a vapor deposition chamber (25°C
, 0, I TORR) to mold polyparaquinrylene (polymer) jig 11! The organic polymer film 2 is deposited on the surface of the L and the voice coil 3, and the deposition is stopped at a preset time (about 60 minutes) to obtain a thickness of about 6μ, and the forming jig 1& is taken out from the vapor deposition chamber. A desired portion was cut and removed to obtain a diaphragm and voice coil assembly 4.

Cross-sectional views of this state are shown in FIGS. 1 and 2.

(Example 2) Under the same conditions as in Example 1, an organic polymer film 2 was steamed onto a molding jig 1b with an outer peripheral fixing ring 6 installed in advance to obtain a diaphragm and its assembly. , a cross-sectional view of this state is shown in FIG. FIG. 4 shows a sectional view of only the necessary parts taken out from the forming jig 1b.

(Example 3) Voice coil 3 was placed in forming jig 1C under the same conditions as Example 1.
A diaphragm and its assembly were obtained by vapor-depositing the organic polymer film 2 on the outer circumferential fixing ring 5 which had been installed in advance, and a cross-sectional view of the resulting state is shown in FIG. Figure 6 shows the forming jig 1.
A cross-sectional view of only the necessary parts taken out from C is shown.

(Example 4) Voice coil 3 was placed in forming jig 1d under the same conditions as Example 1.
The voice coil lead wire 6 is placed along the surface of the jig as shown in FIGS. 7 and 8, and an organic polymer film 2 is deposited on the outer circumferential fixing ring 6 that has been installed in advance, and the diaphragm and its assembly are completed. I got the item. A sectional view of this state is shown in FIG. 9. FIG. 1Q shows a sectional view of only the necessary parts taken out from the forming jig 1d.

(Example 5) When installing the voice coil 3 and the outer peripheral fixing ring 5 in the forming jig 1C under the same conditions as in Example 3, as shown in the enlarged views of the main parts of A and B in FIG. 12, The gap between the molding jig 1C, the voice coil 3, and the outer circumferential fixing ring 5 was filled with silicone wax 7, which was then vapor deposited to obtain a diaphragm and its assembly. Then, the product shown in FIG. 6 in Example 3 was obtained.

In the case shown in Example 6, the vapor-deposited film was formed using a forming jig 1C.
This is to prevent the film near the gap from being cut due to the resistance of the vapor deposited layer entering the gap when the mold is released.Especially when the vapor deposited film is as thin as 6 to 6μ. Works effectively.

As another example, as a method of fixing the voice coil lead wire 6 shown in Example 4, a method of forming grooves in the forming jig 1d in advance to fix and form the voice coil lead wire 6 also yielded good results.

Similar good results were obtained when the above method was used in combination with Example 6.

As a result of assembling the speaker shown in the above embodiments as a speaker, the workability during assembly was improved compared to the conventional method, and good and stable results were obtained in terms of speaker characteristics. In addition, quality problems such as poor adhesion caused by the vibration system have been eliminated.

In the examples, polyvaraxylylene was used, but similar results were obtained when polymonochlorovaraxylylene or polydichlorovaraxylylene was used.

Effects of the Invention As shown in the above examples, the present invention has the advantage that, compared to conventional methods, temperature control during molding is not affected by indoor environmental conditions, and the dimensional stability after molding is independent of the film itself. It is improved because there is no directionality, and the difficulty of handling during assembly is also eliminated by integrating with other parts, and defects due to lamination of two or more diaphragms and contact defects due to adhesion are eliminated.
There is no need to worry about poor properties due to unevenness or weight variations, and it also has excellent heat resistance (melting point 280-40
6°C) It has become possible to provide a highly reliable diaphragm and vibration system.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the method for manufacturing a speaker diaphragm of the present invention, FIG. 2 is a sectional view of a speaker diaphragm obtained by the same method, and FIG. FIG. 4 is a cross-sectional view of the diaphragm for the same Nupika, FIG. 6 is a cross-sectional view of a manufacturing method of another embodiment, FIG. 6 is a cross-sectional view of the diaphragm for the Nupika, and FIG. 8 and 9 are cross-sectional views of the same, and FIG. 10 is a cross-sectional view of a speaker diaphragm obtained by the same method.
The figure is a cross-sectional view showing a manufacturing method of still another embodiment, No. 12.
13 is a sectional view of a conventional speaker diaphragm, and FIG. 14 is a top view of the same. 1azd... Vapor deposition molding jig, 2... Organic polymer film, 3... Voice coil, 4...
...Diaphragm and voice coil assembly, 6..Outer fixing ring, 6..Voice coil lead wire, 7..Nricorn clear diagram.

Claims (5)

[Claims] (1) A method for manufacturing a speaker diaphragm in which an organic polymer is deposited on a molding jig, and when an organic polymer film is formed by this deposition, a voice coil is covered and integrated. (2) A method for manufacturing a speaker diaphragm in which the outer fixing ring of the diaphragm is covered and integrated when a vapor-deposited organic polymer film is formed by vapor deposition on a forming jig. (3) A method for manufacturing a speaker diaphragm in which a voice coil and lead wires are covered and integrated when a vapor-deposited organic polymer film is vapor-deposited on a forming jig. (4) A method for manufacturing a speaker diaphragm in which a voice coil, lead wire, and outer peripheral fixing ring are coated and integrated when a vapor-deposited organic polymer film is vapor-deposited on a forming jig. (5) When forming a vapor-deposited organic polymer film on a forming jig, at least the gap between the voice coil or lead wire, or the outer fixing ring and the forming jig for forming the diaphragm section. A method of manufacturing a speaker diaphragm coated with a mold release agent such as silicone grease in advance.