The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1997
Filed:
Jan. 30, 1996
Kazuki Miyairi, Nagano-ken, JP;
Nissei Plastic Industrial Co., Ltd., Nagano-ken, JP;
Abstract
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.