Optical recording and reproducing apparatus for verifying correc

Details Optical recording and reproducing apparatus for verifying correc Optical recording and reproducing apparatus for verifying correc

1988-06-22

1990-06-19

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 700

Patent

active

049359142

ABSTRACT:
An optical recording and reproducing apparatus includes a controlling circuit for controlling a light intensity of a laser beam emitted by a laser diode. The controlling circuit sets the light intensity in a verifying mode at a level lower than those in data read and write modes. The verifying mode is a mode for verifying whether or not the recording or reproducing apparatus can operate correctly. The apparatus also comprises a verifying circuit for comparing the reproduced information signal obtained in the verifying mode with a reference information signal which corresponds to the information signal written into the optical disc.

REFERENCES:
patent: 4516235 (1985-05-01), Tarzaiski
patent: 4599717 (1986-07-01), Bracht et al.
patent: 4695994 (1987-09-01), Steenbergen et al.

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