Optical disk and recording/reproducing device for optical disk

Details Optical disk and recording/reproducing device for optical disk Optical disk and recording/reproducing device for optical disk

1986-02-18

1988-07-05

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 45, 369 58, 369116, G11B 700, G11B 2736

Patent

active

047559802

ABSTRACT:
In a device for recording or reproducing information by using a light beam, there is provided an optical disk comprising a base plate, a recording layer formed on the base plate, tracks provided for recording information on the recording layer, and a focus check area for checking if the light beam is focused at the optimum position on the recording layer when an optical head which generates the light beam faces the recording layer. Accordingly, it is possible to change the focus position for the recording layer of the optical disk by the objective lens of the optical head during recording and reproducing information. Also, it is possible to set it at a position where the bit error rate is smallest and has a wider margin for the shaft of the adjust position.

REFERENCES:
patent: 4286318 (1981-08-01), Immink et al.
patent: 4527263 (1985-07-01), Nakagawa
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 4630252 (1986-12-01), Miura et al.

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