Optical disc manufacturing apparatus

Details Optical disc manufacturing apparatus Optical disc manufacturing apparatus

1996-02-13

1999-12-07

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425577, 425810, 264 124, 264 133, 264106, 3692753, B29C 4538

Patent

active

059972769

ABSTRACT:
A disc is provided which includes a disc body of disc shape having a center hole. An information recording area is formed on one side surface of the disc body. The information recording area has information thereon read by reflection of laser light. The information recording area has an inner circumferential edge positioned adjacent to the center hole. The disc body has a radius ranging from 39 mm to 80 mm, the center hole has a radius ranging from 7.5 mm to 7.55 mm, and the inner circumferential edge of the information recording area being positioned to extend from a radius of 15 mm to 22 mm from the center of the disc body. A disc may be manufactured by variations of the following disc manufacturing method including the steps of: supporting a stamper on a first mold by a supporting means; defining a forming space by clamping the first mold to a second mold; defining a center hole of the disc by advancing a center hole defining member into a center part of the forming space; connecting a injection means into the forming space by opening a gate member of a resin injection member and filling the forming space with a resin through a communicating hole from the injection means; and cooling the resin in the forming space after shutting off connection between the injection means and the forming space by closing the gate member of the resin injection member.

REFERENCES:
patent: 4391579 (1983-07-01), Morrison
patent: 4394117 (1983-07-01), Taylor
patent: 4405540 (1983-09-01), Mayer
patent: 4802160 (1989-01-01), Yamada et al.
patent: 4862447 (1989-08-01), Opheij
patent: 4950520 (1990-08-01), Imai et al.
patent: 5206063 (1993-04-01), Westerhout
patent: 5460763 (1995-10-01), Asai
"Manufacturing Technique for Optical Disc" Ryoji Takashi, Kabushiki Kaisha Torikeppusu, Tokyo, Japan, Jan. 8, 1987.

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