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 JPS61108296 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker diaphragm for a sandwich structure in which a skin material is adhered to the surface of a lightweight and highly rigid core material used for a speaker. Configuration of the Conventional Example and its Problems In recent years, the mainstream of the diaphragm of the speaker has been cone type to flat type, and there are several methods for the method of flat type diaphragm, among which plastic film is used as core material From the performance and productivity, the most rational diaphragms are the ones that are formed and the skin material is glued on both sides and the skin material is attached 172 A-. Hereinafter, a conventional speaker diaphragm will be described. FIG. 1 is a perspective view of the central portion of the core member of the conventional speaker diaphragm, in which 1 is a lip bonding portion and 2 is a central flat portion. FIG. 2 is a cross-sectional view of the central portion of the speaker diaphragm, in which 3 is a front side skin material, 4 is a back side skin material, 5 is a core material, and 6 is a hot melt adhesive. The core material 6 is a plastic film which is heated and then press-formed or vacuum-formed, and the area of the center of the mold structure, which is the two radial lip assembly points, is wider than the lip width. When the core material 6 is bonded to the skin material, the hot melt adhesive 6 is applied or affixed in advance to the surface of the skin material to be bonded to the core material, as shown in FIG. The hot press is performed from the top and the bottom to bond. At this time, since the central portion of the core member 6 has a larger area than the bonding width of the radial lip, the difference in linear expansion coefficient is caused by the difference in the materials of the core member 6 and the skin member in the state of normal temperature after heating. Will cause the skin to warp and create a dent as the appearance. As a result, there is a problem that a dimple-like depression is generated at the center of the diaphragm, which is an appearance of the speaker, and the commercial value is significantly reduced. SUMMARY OF THE INVENTION The object of the present invention is to 11-05-2019 1 solve the above-mentioned conventional problems, and it is an object of the present invention to provide a speaker diaphragm having 1.4 which can eliminate the shadow of the diaphragm which is important as the speaker appearance. is there. Configuration of the Invention The present invention is a speaker diaphragm including a core member having a structure in which the central portion is not joined to the front side skin and an adhesive for joining the front skin and the old core and the back skin respectively. When a core material obtained by applying an adhesive or pasting a skin material and a plastic film is formed in a sandwich shape and hot pressed from above and below to bond, the wide surface of the core material is joined to the surface skin material Since the structure does not have such a structure, it is possible to eliminate the pitting phenomenon of the appearance of the speaker diaphragm due to the difference in linear expansion coefficient. DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 3 is a perspective view of the core in the core of the speaker diaphragm in one embodiment of the present invention, in which 7 is a rib bonding portion, 8 is a central flat portion and a wide surface of the central portion. Shows a state in which the height of the core material is lowered so as not to be bonded to the front side skin material. FIG. 4 is a cross-sectional view of a central portion of the core material of this example attached as a speaker diaphragm. In FIG. 4, 3 is a skin material of Table 1111, 4 is a back surface skin material, 6 is a real adhesive, and 9 is a core material. The operation of the speaker diaphragm configured as described below will be described below. First, a hot-melt adhesive 6 'is applied or stuck to the surface of the front side skin 3 and the back side skin 4 to be bonded to the core 9, and it is sand-in shaped with the core 9 from the top and bottom. Heat pressing is performed, and only the rib bonding parts arranged in the contact radial direction are adhered, and the wide surface of the core central part is not bonded to the front side skin material 3, so the depression of the front side skin material 3 It will not occur. As described above, according to the present embodiment, the depression of the diaphragm, which is important as the appearance of the speaker, can be eliminated by indenting the wide surface of the central portion of the core member so as not to join the front side skin member. In addition to the bending strength in the radial direction of the diaphragm, by providing the step in the center of the core member, the strength can be further improved and the rigidity can be increased. In addition, not only when the wide surface of the central part of the core member 6 of this embodiment is at the middle position of the core material height, but also when it is joined to the back side skin member, the diaphragm appearance intended by the present invention It goes without saying that it is possible to eliminate the hollow of the. In this case, it is also possible to make a hole in the back side skin material in the case of bonding to the back side skin material and not to make a joint. According to the present invention, it is possible to eliminate the depression of the diaphragm which is important as the appearance of the speaker by not joining the central portion of the core member of the speaker diaphragm with the front side skin material, and to prevent vibration. It is possible to realize a superior loudspeaker diaphragm which can be made more rigid even in the radial bending strength of the plate. 11-05-2019 2 [0002] Brief description of the drawings [0003] FIG. 1 is a perspective view of a conventional plastic core material central portion, FIG. 2 is a cross-sectional view of a central portion of a speaker diaphragm using the conventional core material, and FIG. 3 is a speaker according to an embodiment of the present invention FIG. 4 is a perspective view of the central portion of the core material of the diaphragm, and FIG. 4 is a cross-sectional view of the central portion of the loudspeaker diaphragm. 3 · · · Front side skin material 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Center flat portion .... Rib material. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 J6 Figure 3 Figure 4 11-05-2019 3
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