Process for producing substrate of optical disc

Details Process for producing substrate of optical disc Process for producing substrate of optical disc

1989-07-31

1990-10-09

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264335, 249 661, 425351, 425556, 425810, B29C 4540

Patent

active

049618849

ABSTRACT:
An improved injection molding process for producing a substrate of an optical disc having a high quality is disclosed. The process includes the steps of: fixing a stamper having protrusions corresponding to pits for recorded information or a groove for tracking onto one mold unit of a pair of mold units of an injection molding machine; combining the mold units to form a closed cavity between the pair of mold units; charging a molten molding resin into the cavity; cooling the resin in the cavity to form a molded substrate; separating one mold unit from another mold unit; and releasing the molded substrate simultaneously from both mold units when the two mold units are separated from each other by applying pressurized air onto both sides of the substrate.

REFERENCES:
patent: 4340353 (1982-07-01), Mayer
patent: 4381964 (1983-05-01), Lock
patent: 4500486 (1985-02-01), Rascle

Affiliated with

Also associated with

Rating

Process for producing substrate of optical disc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing substrate of optical disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing substrate of optical disc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-972112