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Method of manufacturing speaker diaphragms

A manufacturing method, technology of vibrating membrane, applied in the field of loudspeaker vibrating membrane

Active Publication Date: 2008-10-08
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be said that a manufacturing method providing sufficient moldability and good mass productivity is realized

Method used

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  • Method of manufacturing speaker diaphragms
  • Method of manufacturing speaker diaphragms
  • Method of manufacturing speaker diaphragms

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0090] First, if Figure 3A As shown, as a preparatory step for the manufacture of the speaker diaphragm, a log 6 as a wood material for the speaker diaphragm is thinly cut out a wood slice 61 along its circumference by a stripping cutter 7 in a rotating manner. The wood veneer 61 is cut into an appropriate shape and its size is larger than the shaped part. This molded part will be made into an actual diaphragm. Such as Figure 3B As shown, a wood veneer 10 having a large and straight grain is formed. here, Figure 3B The wood veneers shown in 10 are Figure 3AAn enlarged schematic view of a portion of the wood veneer 61 shown in FIG. The dotted circles in the wood veneer 10 are the molded parts that will be made into the actual diaphragm. For example, when the speaker diaphragm has an aperture of about 8 cm, a square or rectangle having a side of about 12 to 14 cm, or a circle having a diameter of about 12 cm will be used.

[0091] Next, a manufacturing method accordin...

no. 2 example

[0116] The difference between the manufacturing method according to the second embodiment and the manufacturing method according to the first embodiment will be mainly described, and the description of the same parts will be appropriately omitted. The second embodiment is characterized in that not only a piece of cloth or paper 13 is adhered to one surface of the wood sheet 10, but also a piece of cloth or paper 13' is adhered to the center of the surface opposite to the surface to further prevent cracks in Formed in hot stamping, and strengthen the strength of the neck portion around the central hole 25 of the voice coil of the vibrating membrane.

[0117] That is, if Figure 9A As shown, the cloth or paper 13 is entirely pasted on one surface (rear surface) of the wood sheet 10, and the circular cloth or paper 13' is pasted on the central part of the surface (front surface) opposite to the surface (front surface) with an adhesive ( Paste step (a2)). The size of this circul...

no. 3 example

[0120] The difference between the manufacturing method according to the third embodiment and the manufacturing method according to the first embodiment will be mainly described, and the description of the same parts will be appropriately omitted. The material of the speaker diaphragms 30 and 40 according to the manufacturing methods of the first embodiment and the second embodiment is anisotropic wood. Therefore, as mentioned above, almost no crack vibration occurs. In the third embodiment, the speaker diaphragm 50 has a plurality of conical tops to completely suppress crack vibration.

[0121] That is, if Figure 10A As shown, in the second hot stamping forming with the punching device P2', the adhesive sheet 15 or wood sheet 10 is hot stamped with an upper die 34' having a concave portion 38 and a lower die 35' having a protruding portion 39 ( Second stamping step (h3)). Other steps are the same as the manufacturing method of the first embodiment.

[0122] In this way, i...

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Abstract

On one surface of a piece of wooden sheet (10) , a cloth or paper (13) is adhered to make an adhered sheet (15) (step a1). An approximately V-shaped notch (11) is provided on the adhered sheet (15) (step b1), the adhered sheet (15) is wetted to be softened, and a lubricant (16) which acts to keep water is impregnated thereinto (step c1). Edge portions (11a, 11b) of the notch (11) are overlapped, and the adhered sheet (15) is tentatively molded in an approximately horn shape by a first hot press molding (step d1). The adhered sheet (15) is then dried (step e1), impregnated with thermosetting resin (17) (step f1), and half-dried (step g1). The adhered sheet (15) is subject to a second hot press molding (step h1). A moisture-proof agent (18) is applied on the adhered sheet (15) (step i1), a center hole (25) for avoice coil and periphery are removed to make a speaker diaphragm (30) having a predetermined dimension and shape (step j1).

Description

[0001] This application is a divisional application of the invention application with the application number 2004100044237, the application date is February 19, 2004, and the invention name is "speaker diaphragm and dynamic speaker". technical field [0002] The present invention relates to a loudspeaker diaphragm for an audio loudspeaker, a method for manufacturing the diaphragm and a dynamic loudspeaker. Background technique [0003] Known diaphragms for dynamic loudspeakers are mostly made of pulp, plastic or metal such as aluminium. These known diaphragms are formed by stamping a uniform material so that the speed of sound propagation from the center of the diaphragm in each radial direction is the same as that of each other. Then, with the conventional vibrating membrane, a standing wave is generally generated and a resonance point occurs. In addition, sound pressure frequency characteristics deteriorate due to separation vibrations in the low frequency range. Also, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R31/00H04R7/12H04R7/02H04R7/14
Inventor 今村智平野猛尾形知昭桑波田敏胜
Owner VICTOR CO OF JAPAN LTD
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