Optical information medium with sample mark area and multiple tr

Details Optical information medium with sample mark area and multiple tr Optical information medium with sample mark area and multiple tr

1988-02-08

1991-02-05

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 369 4434, G11B 724, G11B 7013

Patent

active

049911635

ABSTRACT:
An optical disc consists of a base plate, a reflective thin layer, and a protective thin layer. The optical disc has a sample mark area having two sample marks, one of which is off-set on one side of a track, another of which is off-set at an opposite side of a track. These sample marks are produced by an injection molding with replica technique. At the time of the injection molding, additional pressure moves soft injected plastic resin, which causes double transcription of the sample marks. For preventing the double transcription, groove areas are provided on opposite sides of the sample mark area. The groove areas provide an anchor effect at the time of injection molding.

REFERENCES:
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4807210 (1989-02-01), Kaku et al.
Nagashima et al, Experimental estimation of an optical disc sys. with V-shaped grooves, Appl. Phys. Lett. 43(1), 7/1/83, pp. 4-6.

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