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US 5,700,501 AGranted
Injection mold for molding discs
AssigneeNissei Plastic Industrial Co., Ltd.
InventorKazuki Miyairi
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AssigneeNissei Plastic Industrial Co., Ltd.
InventorKazuki Miyairi
Estimating the term…
An injection mold for molding discs is provided, wherein the injection mold comprises a base die, a board fitted inside the base die, a stamper in the form of a doughnut fitted to the front surface of the board, an outer ring fitted to the front end of the base die, and a sleeve having a flange fitted to the center of the board, the ring and/or the flange fixing the stamper to the board. The injection mold further comprises a thin disc thicker than the stamper interposed closely between the stamper and the board so as that the front surface of the thin disc contacts with the back surface of the stamper. According to the thus constructed injection mold of the present invention, it is possible to prevent dust or dirt from sticking when the stamper is replaced in the field, and to make it unnecessary to replace the mirror surface board, by mounting the combination of the stamper and thin disc on the mold.
An injection mold for molding discs comprising a base die, a board fitted inside said base die, a stamper in the form of a doughnut fitted to the front surface of said board, an outer ring fitted to the front end of said base die, and a sleeve having a flange formed on its one open end fitted to the center of said board,
An injection mold for molding discs comprising a base die, a board fitted inside said base die, a stamper in the form of a doughnut fitted to the front surface of said board, an outer ring fitted to the outer periphery of said front surface of the board, and a sleeve having a flange formed on its one open end fitted to the center of said board,
Dependencies are inferred from the claim text.