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Speaker diaphragm and method of forming the same

A technology for vibrating plates and loudspeakers, applied to sensors, planar diaphragms, electrical components, etc., which can solve problems such as insufficient physical properties such as Young's modulus, and inability to obtain loudspeaker sound characteristics

Inactive Publication Date: 2006-03-29
PIONEER CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, with regard to the prior art described in Patent Document 2, although inorganic fibers such as metal fibers, carbon fibers, and glass fibers are mixed with phosphoric acid-based cellulose fibers or phosphoric acid-based polyvinyl alcohol fibers, sufficient flame retardancy or durability can be obtained. Thermal properties, and the speaker diaphragm obtained by improving the hygroscopicity also has stability, but its physical properties such as Young's modulus are not sufficient, so there is a problem that good acoustic characteristics of the speaker cannot be obtained

Method used

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  • Speaker diaphragm and method of forming the same
  • Speaker diaphragm and method of forming the same
  • Speaker diaphragm and method of forming the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]In the papermaking process, wood pulp (conifer sulfate pulp) is used as fiber, expandable graphite is used as expansion agent, and a papermaking pulp is formed by mixing with a ratio of 90 parts by weight of wood pulp and 10 parts by weight of expandable graphite. The mixing example of is an example, and the flame retardancy can generally be improved by mixing flame-retardant or non-combustible fibers. Among them, as the expanded graphite to be mixed, the expanded graphite having a particle diameter of 50 mesh or more and capable of papermaking is used.

[0031] In the dipping and drying process, triphenyl phosphate is mixed with a mixed solvent containing aromatic hydrocarbons as a solvent at a ratio of 30 parts by weight of triphenyl phosphate and 70 parts by weight of a mixed solvent, and this mixture is used as a flame retardant The liquid (impregnation liquid) of the composition, uniformly and fully immersing the formed vibration plate base material in the liquid co...

Embodiment 2

[0033] It was formed by the same treatment process as in Example 1 except that the mixing ratio of wood pulp and expandable graphite in the papermaking process was different (wood pulp: 70 parts by weight, expandable graphite: 30 parts by weight).

Embodiment 3

[0035] In the same papermaking process as in Example 1, wood pulp (coniferous kraft pulp) is used as fiber, expandable graphite is used as expansion agent, and 80 parts by weight of wood pulp, 10 parts by weight of fiber length 3mm Aramid fibers and 10 parts by weight of expandable graphite were mixed to form paper pulp. In this example, by using aramid fiber, the flame retardancy of the substrate is improved, and the thickness of the papermaking substrate is increased, so that TPP can be effectively absorbed during the resin impregnation treatment. In addition, in this example, in order to achieve a moderate amount of adsorption, the used treatment liquid consisted of 20 parts by weight of TPP and 80 parts by weight of a mixed solvent. Then, in the same process as in Example 1, after the liquid containing the flame retardant component was dipped, hot air drying was performed.

[0036] (characteristic of the embodiment)

[0037] Next, the physical properties of the above-men...

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PUM

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Abstract

It is an object of the present invention to ensure that when a speaker diaphragm having an adequate fire resistance is to be obtained, it is possible to ensure stability of various characteristics and thus avoid a deterioration of an audio characteristic of the speaker device. An expansive graphite is mixed / milled with at least one of a natural fiber, a chemical fiber, an inorganic fiber, a synthetic fiber and the like consisting of different fibers selected from the foregoing fibers (step of mixing / milling a fiber with an expansive graphite), thereby obtaining a paper slurry. The paper slurry is adjusted and heated at an adequate molding temperature necessary for the expansive graphite to expand, thereby effecting milling and molding (milling / molding step) and thus obtaining a milled material serving as a diaphragm substrate having a fire resistant layer formed by a heated expansion of the expanding agent. The diaphragm substrate is then dipped in a liquid containing a fire resistant component (step of dipping the diaphragm substrate in a liquid containing a fire resistant component), followed by a drying step (drying the diaphragm substrate) and a finishing step (cutting the diaphragm substrate in accordance with desired inner and outer diameters), thereby obtaining a desired speaker diaphragm having a sufficient fire resistance.

Description

technical field [0001] The present invention relates to a diaphragm for a loudspeaker and a method for forming the same. Background technique [0002] The material of the loudspeaker diaphragm is selected in order to obtain various characteristics suitable for the intended reproduction range, but the environmental resistance is further adapted to the installation environment of the speaker device. In particular, when a speaker device is installed in an environment where measures against fire such as a vehicle are used, a speaker diaphragm having flame retardancy is required. As a flame-retardant diaphragm, the following patent documents 1 and 2 have been proposed. Documented prior art. [0003] That is, the following document 1 describes a diaphragm for a speaker, which is produced by impregnating at least a part of a cone-shaped diaphragm mainly composed of cellulose fibers by dipping, spraying, or the like. The organic phosphorus-containing nitrogen-containing compound m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R7/04H04R31/00
CPCH04R7/02
Inventor 川田一春关川秀雄石垣敏宏
Owner PIONEER CORP