Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS5821997 [0001] The present invention relates to a speaker diaphragm, and more particularly to a speaker diaphragm having improved heat resistance. Loudspeaker diaphragms are required to have small mass, high Young's modulus, and appropriately high internal loss. However, certain loudspeakers require heat resistance in addition to the above characteristics. . For example, in a car-mounted speaker or a speaker for a portable radio cassette, the temperature may be considerably high due to direct sunlight or sealing in the car. For example, in summer, a car parked for a long time under the hot sun reaches 70-80 ° C. in a closed state, and a car-mounted speaker using a black carbon-based diaphragm is: The diaphragm may reach 100 ° C. or higher, and in the case of a sore, the diaphragm may be deformed to cause an unpleasant sound. Therefore, the present invention is intended to provide a superior one to any diaphragm material developed in the prior art, and it has a high Young's modulus, an appropriate internal loss can be obtained, and control of characteristics is relatively easy. It is characterized in that a diaphragm is formed based on a material composed of graphite and a synthetic resin. Graphite (graphite), in particular scaly graphite crystals exhibit extremely good Young's modulus, or large ones like diaphragms can not be formed with pure graphite crystals alone. By using a resin as a binder, crystals (1-5 μm) are made into a molded article of ^ Young's modulus. Therefore, a material in which graphite is impregnated with a phenol resin and polyvinyl chloride has been provided, but when this is used as a diaphragm, the internal loss tan α is as small as about 0.02, and the performance is insufficient. In addition, although polyvinyl chloride and polyvinylidene chloride impregnated into graphite have a large internal loss tan α of 0.05, they show a Young's modulus at a temperature environment of room temperature or higher. A remarkable drop is recognized, and it can not serve as a car-mounted speaker placed in a high temperature environment. In the present invention, while making full use of the characteristics of graphite, the internal loss is improved, and furthermore, the Young's modulus does not decrease and the physical properties do not 11-05-2019 1 change extremely under high temperature environment by sunlight as well as under normal temperature. A scale-like graphite and a diaphragm for a speaker formed by impregnating the same with a synthetic resin, polyvinyl chloride and ABS resin as a synthetic resin to be impregnated with the graphite. -3- and so on were selected. The diaphragm for a speaker according to the present invention uses polyvinyl chloride as a scaly graphite scaly material and post-chlorinated polyvinyl chloride to further improve heat resistance and ABS which contributes to improvement of heat resistance and processability. The resin is blended to adjust the heat distortion temperature of the Z diaphragm. Example 1 Formulation example (parts by weight) polyvinyl chloride 60 ABS resin 40 lead stearate 2 flake graphite 200 (lead stearate is polychlorinated! Nil's heat stabilizer is used as a lubricant at the time of kneading. The mixture is kneaded by means of a kneading roll, an internal mixer, an extruder or the like, and is further rolled using a roll. This rolling is repeated several times so that the flat face of the flake graphite flakes is oriented parallel to the surface of the rolled sheet. The physical properties of the obtained sheet at 30 ° C. are as described above. Density 1.7 × 10 3 kg / l Young's modulus 5.7 × 10 ′ ′ N / 12 internal loss tan α 0, 02 This sheet-like material is formed into a desired shape by vacuum forming, pressure forming or the like to obtain a diaphragm. The attached drawings show the relationship between the diaphragm according to the present invention and the Young's modulus and temperature of a conventional product diaphragm which will be shown below as a combination example. Conventional Example (Composition Example Double Part) Polyvinyl Chloride 100 Lead Stearate 2 Scale-Like Graphite 200 Example 2 Formulation Example (Weight Part) Polyvinyl Chloride 30 Post Chlorinated Polyvinyl Chloride 30 ABS Resin 40 Lead Stearate 25 Scale Sheet obtained by the same process as in Example 1 had a density 1.7 × 103 kg / 1 Young's modulus 5.5 × 10 Vaginal N / 12 internal loss tan α 0.02 heat deformation as compared with the conventional diaphragm. The humidity is improved by 30.degree. C. to about 100.degree. In addition, if the compounding quantity of post-chlorinated polyvinyl chloride is reduced from the said compounding quantity, heat distortion temperature will fall, but workability ¦ operativity will improve. Conversely, if the amount is increased, the heat distortion temperature rises, but the workability decreases. Therefore, the blending amount of post-chlorinated polyvinyl chloride is appropriately adjusted depending on the use of the speaker. Example 3 Formulation example (weight 11 postchlorinated polyvinyl chloride 60 ABS resin 40 lead stearate 2 scaly graphite 200 sheet obtained by the same process as in Example 1 according to these formulations, density 1.7 × 103 kg / L Young's modulus 5, 3 X 10 唖 N / 112 internal loss tan α 0.02 Young's modulus According to the moisture characteristic curve, it is about 50 ° C improved to 120 ° C compared to the conventional product . As apparent from the above description, the speaker diaphragm of the present invention has a small decrease in Young's modulus due to temperature, and is particularly suitable for use in a high temperature environment. 11-05-2019 2 [0002] Brief description of the drawings [0003] The attached drawings show the relationship between Young's modulus and temperature of the diaphragm of the present invention and the diaphragm of the conventional product. Patent application applicant Pioneer Corporation Representative attorney Patent attorney Shingo Kohashi Patent attorney patent attorney Susumu Murai 7-Chief of Patent Office Kazuo Wakasugi 1. Patent No. 121180 No. 2, name of the invention, speaker diaphragm 3, relationship with the case making correction Patent applicant Tokyo Meguro-ku, Tokyo R-4, No. 4, No. 4, Agent 5, Scope of claims in the specification of the correction, column 6 of the claims of the specification, as per the attached sheet of the correction (Attachment) 2, claims (1) Vibration for a speaker formed by mixing scale-like graphite and this with a synthetic resin The diaphragm for the speaker comprised with polyvinyl chloride and / or post-chlorinated polyvinyl chloride 90-20, ABS resin 10-80, scale-like graphite 30-300 each part weight in a board ¦ plate. 11-05-2019 3
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