Patent ID: 6520764
Filing Date: 2003-02-18
Classification: B29C,B29K,B29L,Y10S

Abstract:
A molding die for molding a thin circular plate optical recording disk by injecting a molten thermosetting resin in a cavity, the molding die comprising:a stationary mirror, said stationary mirror having a lower surface; a stamper, said stamper having an upper surface and a lower surface, the upper surface of said stamper being contiguous with the lower surface of said stationary mirror; an outer peripheral member, said outer peripheral member having an upper surface, a lower surface and a side surface, the upper surface of said outer peripheral member being contiguous with a second portion of the lower surface of said stamper; a movable mirror, said movable mirror having a first upper surface, a second upper surface and a first side surface, wherein the lower surface of said outer peripheral member is contiguous with the second upper surface of said movable mirror and a second portion of the side surface of said outer peripheral member is contiguous with the first side surface of said movable mirror, and said cavity is formed between a first portion of the lower surface of said stamper, a first portion of the side surface of said outer peripheral member, and the first upper surface of said movable mirror, and a cooling rate of said outer peripheral member coming in contact with a portion which becomes an outer peripheral surface of the optical recording disk is slower than a cooling rate of the first portion of the lower surface of said stamper and the first upper surface of said movable mirror, both of which come in contact with portions that become main surfaces of the optical recording disk.