Method of producing plate-shaped body

专利名称：Method of producing plate-shaped body发明人：Tokihalu Nakagawa,Shoji Ohmiya申请号：US06/112137申请日：19800114公开号：US04302411A公开日：19811124

摘要：A method of producing a plate-shaped body, particularly a video disc in whichcircumferential warp in the thicknesswise direction, thickness fluctuation and deflection ofthe signal track are minimized comprising

The steps of pressing by a mold a thermoplastic resin which has been heated to atemperature above the softening point thereof, and cooling the thermoplastic resin tosolidify the same. During the cooling, the pressure of the mold is decreased to a lowlevel when the thermoplastic resin has been cooled down to a temperature around thesoftening point. The thermoplastic resin is allowed to be solidified without anysubstantial and local residual stress to ensure minimal circumferential warp, thicknessfluctuation and deflection signal track.

申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

代理机构：Stevens, Davis, Miller & Mosher

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