Optical recording and reproducing apparatus and recording medium

Details Optical recording and reproducing apparatus and recording medium Optical recording and reproducing apparatus and recording medium

1991-10-30

1993-11-16

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 94, 369283, 36927530, 369116, 369 4429, G11B 700

Patent

active

052630110

ABSTRACT:
An optical recording and reproducing apparatus stably set the gains (focus, tracking) corresponding to the respective layers at the insertion time of a recording medium having a multilayer record membrane. The optical recording and reproducing apparatus uses a recording medium having a multilayer membrane construction wherein the recording membranes are formed in a stage shape, is not superposed in the inner periphery or the outer periphery with respect to the laser transmission side, and has a circuit for detecting the number of the recording membranes, and a circuit for switching to a focus gain or a tracking gain in conformity with the recording medium, and a focus driving circuit for effecting a focus drawing-in operation. The driving circuits are driven so that they may be rotated or run into a condition of effecting capable of focus drawing-in operation, and thereafter the focus drawing-in operation is effected in the specific position of the recording medium.

REFERENCES:
patent: 4337532 (1982-06-01), Oprandi et al.
patent: 4755980 (1988-07-01), Yoshimaru et al.
patent: 4982397 (1991-01-01), Yokota

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