Optical information recording and reproducing apparatus and meth

Details Optical information recording and reproducing apparatus and meth Optical information recording and reproducing apparatus and meth

1993-11-12

1996-07-30

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 54, 369 58, G11B 709

Patent

active

055419003

ABSTRACT:
Optical information recording and reproducing apparatus and method of the invention perform the recording and reproducing for various types of information recording media each having a converged laser spot size different from the spot sizes of the other types. The optical information recording and reproducing apparatus includes a spot size recognizing circuit for recognizing a spot size suitable for an information recording medium to be loaded, and performs erasing, recording, and reproducing to the information recording medium by defocusing or by off-tracking based on the spot size recognized by the spot size recognizing circuit.

REFERENCES:
patent: 5042020 (1991-08-01), Endo
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5329510 (1994-07-01), Tsuyuguchi et al.

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