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  Damper for speakerRelated Patent Categories: Stock Material Or Miscellaneous Articles, Coated Or Structually Defined Flake, Particle, Cell, Strand, Strand Portion, Rod, Filament, Macroscopic Fiber Or Mass Thereof, Rod, Strand, Filament Or FiberDamper for speaker description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060093817, Damper for speaker. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a damper for a speaker device. [0003] 2. Description of Related Art [0004] Conventionally, a woven fabric using a meta-type aromatic polyamide fiber thread, a thread made by mixed-spinning or twining a meta-type aromatic polyamide thread and a cotton thread, a polyester fiber thread, a thread made by mixed-spinning or twining the polyester fiber thread and the cotton thread, and the cotton thread is generally used as a fabric material of a damper supporting a vibration system of a speaker device. In addition, the fabric material including the above-mentioned fibers is normally impregnated with a thermosetting resin such as a phenol resin, and is formed by hot press into the damper. [0005] Examples of the damper for the speaker using the above-mentioned threads are disclosed in Japanese Patent No. 3287750, Japanese Patent Publication No. 58-30796, and Japanese Patent Applications Laid-open under No. 8-149597, No. 10-322796 and No. 62-258596. [0006] Since strength of the fabric material of the fiber used for the above-mentioned damper is low, there is a problem in a recent high-powered speaker that the damper is cut during the operation of the speaker. Therefore, it is necessary to improve elasticity and tensile strength of the damper fabric material. [0007] For the purpose of solving such a problem, there is proposed a technique of using double fabric materials. However, there are such problems that the material cost increases, the weight of the damper increases, a follow-up ability to vibration operation becomes insensitive and the attached fabric materials peel off. SUMMARY OF THE INVENTION [0008] The present invention has been achieved in order to solve the above problems. It is an object of this invention to provide a damper for a speaker which has sufficient strength and which never breaks even when it is applied to a large input speaker. [0009] According to one aspect of the present invention, there is provided a damper for a speaker including: first fiber having a tensile strength of equal to or larger than 17 cN/dtex; and second fiber having a tensile elastic modulus of equal to or smaller than 200 cN/dtex. Thereby, it becomes possible to ensure the necessary tensile strength and elasticity. [0010] In a form of the above damper for the speaker, a ratio of the first fiber to a total amount of the first and second fibers may be from 10% to 90%. If the ratio of the first fiber is smaller than 10%, the necessary tensile strength and elasticity cannot be obtained. Meanwhile, if the ratio of the first fiber is larger than 90%, a punching property at the time of manufacturing damper deteriorates. Therefore, it is preferred that the first fiber is included in the above-mentioned ratio. [0011] In a preferred example, the first fiber may be a para-type aromatic polyamide fiber, an aromatic polyester fiber (a high tensile strength polyarylate fiber), a polyimide fiber, a high tensile strength polyethylene fiber or a polypara phenylene benzobis imidazole fiber. Further, in another preferred example, the second fiber may be a meta-type aromatic polyamide fiber, a polyester fiber, an acrylic fiber, a polyhenylenesulfide fiber, a polyamide fiber or a cotton fiber. [0012] The nature, utility, and further features of this invention will be more clearly apparent from the following detailed description with respect to preferred embodiment of the invention when read in conjunction with the accompanying drawings briefly described below. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 shows a plan view of a damper according to an embodiment of the present invention; [0014] FIGS. 2A and 2B show partly-enlarged views of the damper according to the embodiment of the present invention; [0015] FIG. 3 schematically shows a manufacturing process of the damper according to the embodiment; [0016] FIGS. 4A and 4B show a result of a tensile strength test; and [0017] FIG. 5 shows results of tensile strength tests of various kinds of mixed-woven fabrics. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] The preferred embodiments of the present invention will now be described below with reference to the attached drawings. [Structure of Damper] [0019] FIG. 1 shows a plan view of the damper according to the present invention. In a speaker device, a damper 10 is fixed to a voice coil bobbin which vibrates in accordance with an input signal and a frame of the speaker device body, thereby to elastically support the voice coil bobbin. Specifically, an inner peripheral edge 10a is fixed to the voice coil bobbin, and an outer peripheral edge 10b is fixed to the frame of the speaker device body. In addition, in the damper 10, plural concentric corrugations 10d are formed from the inner peripheral edge to the outer peripheral edge. The damper 10 of the present invention is applicable to various kinds of speaker devices, irrespective of structures and driving systems. Continue reading about Damper for speaker... Full patent description for Damper for speaker Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Damper for speaker patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Damper for speaker or other areas of interest. ### Previous Patent Application: 3gt/4gt biocomponent fiber and preparation thereof Next Patent Application: Glass fiber filtration media with at least two different fiber diameters Industry Class: Stock material or miscellaneous articles ### FreshPatents.com Support Thank you for viewing the Damper for speaker patent info. IP-related news and info Results in 0.52646 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , |
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