JP3622750B2 - Manufacturing method of speaker diaphragm - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a speaker diaphragm that is suitable for use in a speaker.
[0002]
[Prior art]
Conventionally, the diaphragm of a speaker has been mainly molded from paper pulp and plastic. Under such circumstances, a wooden diaphragm is desired as a diaphragm capable of reproducing sounds closer to natural sounds.
[0003]
As a method for manufacturing the wooden diaphragm, for example, methods as shown in FIGS. 2 and 3 are considered. In the manufacturing method shown in FIG. 2, an arc-shaped notch 1 a is formed in the center of one wooden sheet 1 in advance, and a fan-shaped notch 1 b is formed continuously therewith. In this method, both edge portions 1b-1 and b-2 of the cutout portion 1b are bonded to each other, and then a rubber-like diaphragm 1 is formed by press heat molding.
[0004]
Further, the manufacturing method shown in FIG. 3 is a method in which a plurality of small wooden piece sheets 2-1,...
[0005]
[Problems to be solved by the invention]
However, in the manufacturing method as described above, since the sheet is formed only of wood, cracking occurs during press molding, or the sheets are stuck to each other. There is a problem that the vibration cannot be obtained.
[0006]
Therefore, the present invention is intended to provide a method for manufacturing a speaker diaphragm that solves the above problems.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the present invention
The thickness is approximately 0.25 mm and the propagation speed is longitudinally 4.5 to 5.0 km / sec, laterally 2.0 to 2.5 km / sec, and thin on one side of a single wooden sheet in advance. A non-woven fabric or Japanese paper is pasted to prepare a laminated sheet, and this laminated sheet is impregnated in a container containing a lubricant. In order to make the formed laminated sheet a predetermined dimension, the center hole corresponding to the voice coil is punched and the outer diameter is removed, and both sides of the substantially trumpet-shaped laminated sheet formed into the predetermined dimension are resin-coated. A method for manufacturing a speaker diaphragm, comprising:
Is to provide.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a manufacturing process diagram of the speaker diaphragm according to the present embodiment. In the figure, first, as a first step, a laminated sheet 10 is formed by laminating a known material or a non-woven fabric made of carbon material or Japanese paper 10b with an adhesive on one surface side of a wooden sheet 10a having a thickness of about 0.25 mm. Create [FIG. 1 (a)].
[0009]
Next, the laminated sheet 10 is impregnated in a container A containing a lubricant. The purpose of this impregnation is a process for smoothing the “roughness” of the surface of the wooden sheet 10a and for drawing out “tension” and “flexibility” on the wooden sheet 10a itself so as to be suitable for vibration [ FIG. 1 (b)].
[0010]
In this way, the laminated sheet 10 from which “tension” and “smoothness” are drawn is formed into a well-known substantially trumpet shape by press heat treatment by a press device P having a well-known configuration in the next third step. [FIGS. 1 (c), (d)].
[0011]
Thereafter, the laminating sheet 10 formed into a trumpet shape is punched at the center to form a hole 10-1 corresponding to a voice coil (not shown), and the outer diameter is removed to obtain a predetermined diaphragm dimension. [FIG. 1 (d), (e)].
[0012]
Then, as a final post-process, the resin 10 c is applied to prevent deformation, or the resin 10 c is coated on the front and back surfaces of the diaphragm 10 by impregnating a resin liquid container.
[0013]
As described above, according to the manufacturing method of the present embodiment, the wooden sheet is cracked at the time of press molding, or the sticking part between the sheets becomes unnecessary, and as a result, there is no seam for laminating one sheet. When a wooden diaphragm is obtained and used in a speaker, the sound quality due to natural vibration due to the wooden vibration is reproduced.
[0014]
Further, according to the verification by the present inventors, the propagation speed of the conventional paper pulp diaphragm is 2.0 km / sec in both the vertical and horizontal directions, whereas according to the diaphragm 10 of the present embodiment,
Longitudinal direction: 4.5 to 5.0 km / sec
Lateral direction: 2.0-2.5km / sec
Thus, the propagation speed has been improved, the resolution has been improved, and the reproduction of crisp sound has been confirmed.
[0015]
【The invention's effect】
According to the speaker diaphragm using the manufacturing method of the present invention, a single wooden seamless diaphragm for lamination can be obtained, sound quality close to natural can be reproduced, and the propagation speed can be improved, The resolution is further improved, and effects such as the ability to reproduce crisp sounds can be achieved.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a method of manufacturing a speaker diaphragm according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a method of manufacturing a speaker diaphragm, which is a first conventional example.
FIG. 3 is a diagram for explaining a manufacturing method of a speaker diaphragm, which is a second conventional example.
[Explanation of symbols]
10 Laminated sheet 10-1 Hole 10a Wooden sheet 10b Non-woven fabric or Japanese paper 10c Resin

Claims (1)

The thickness is approximately 0.25 mm and the propagation speed is longitudinally 4.5 to 5.0 km / sec, laterally 2.0 to 2.5 km / sec, and thin on one side of one wooden sheet in advance. A non-woven fabric or Japanese paper is pasted to prepare a laminated sheet, and this laminated sheet is impregnated in a container containing a lubricant, and the impregnated laminated sheet is formed into a substantially trumpet shape by press heat molding. In order to make the formed laminated sheet a predetermined dimension, the center hole corresponding to the voice coil is punched and the outer diameter is removed, and both sides of the substantially trumpet-shaped laminated sheet formed into the predetermined dimension are resin-coated. A method for manufacturing a speaker diaphragm.

Images