Making method for high-density optical disk

Details Making method for high-density optical disk Making method for high-density optical disk

1992-01-23

1993-07-27

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

1566591, 156663, 369277, 428138, 428156, 430321, 430323, B44C 122, C03C 1500

Patent

active

052307700

ABSTRACT:
In a making method for a high-density optical disk, comprising the step of forming recording pits or recesses for forming the recording pits by etching through apertures of a photoresist layer, a light intensity distribution of an exposure beam spot for forming each aperture through the photoresist layer is made different between a circumferential direction of the optical disk and a direction perpendicular to the circumferential direction, thereby setting a ratio between a length of each pit and a length of each land in respect of the circumferential direction to about 1.1

REFERENCES:
patent: 4544443 (1985-10-01), Ohta et al.
patent: 4747093 (1988-05-01), Benne et al.
patent: 4818648 (1989-04-01), Ohta et al.
patent: 5008176 (1991-04-01), Kondo et al.

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