US 2001/0019535 A1 · Optical disc and injection compression molding die for producing the same

Abstract

An optical disc capable of preventing damages on a printing plate and an injection compression molding die capable of producing such optical disc substrate without raising the accuracy of the die are provided. An optical disc substrate according to one embodiment of the present invention has a ring-formed projected portion on the outer periphery of the printable plane slightly recessed inwardly from the outer edge of the disc. Such optical disc substrate can be produced using a molding die in which a readout-side mirror has a ring-formed groove on the inner surface thereof in the vicinity of a sliding portion between such readout-side mirror and a cavity ring.

Claims6

Dependent claims

An optical disc having a ring-formed projected portion formed on an outer periphery of at least a printable plane thereof.

Dependencies are inferred from the claim text.

Facts

Application

09/774,701Filed 1 Feb 2001

Priority

JP P2000-0248852 Feb 2000

Published

6 Sep 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

B29C 45/263
Moulds: with mould wall parts provided with fine grooves or impressions, e.g. for record discs
G11B 7/24
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the…:…
B29C 2045/2667
With mould wall parts provided with fine grooves or impressions, e.g. for record discs: particular inner or outer peripheral portions of the substrate
G11B 7/263
Apparatus or processes specially adapted for the manufacture of record carriers: preparing and using a stamper, e.g. pressing or injection molding…

Optical disc and injection compression molding die for producing the same

Life of this patent

Optical disc and injection compression molding die for producing the same

Life of this patent

Abstract

Claims6