Optical disk substrate with land planes of uniform height

Details Optical disk substrate with land planes of uniform height Optical disk substrate with land planes of uniform height

1993-06-15

1996-12-10

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 648, 428913, 4302701, 43027011, 43027012, 43027014, 430945, 430496, 3692751, 3692754, 369277, 369278, 369283, B32B 300

Patent

active

055828914

ABSTRACT:
A method of making a stamper uses a photoresist disk cut by the application of a laser beam on the land planes thereof, or a stamper which is different in depth between the land plane on the internal peripheral side with respect to the prepit portion and the land plane on the external peripheral side. A method of making an optical disk substrate includes the steps of using a stamper, and molding a transparent plastic material with an injection molding method. A stamper capable of sufficiently transferring the prepits and guide grooves on the optical disk substrate with the correction of right and left inequality of the prepits, and the method of making it, and a superior optical disk substrate and a method of making it can be realized.

REFERENCES:
patent: 4947384 (1990-08-01), Suzuki
patent: 4956214 (1990-09-01), Imataki
patent: 5017414 (1991-05-01), Gregg
patent: 5210738 (1993-05-01), Iwata
patent: 5344683 (1994-09-01), Shimizu

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