Optical recording and reproducing apparatus and recording medium having multilayer recording membranes
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United States of America Patent
Stats
-
Nov 16, 1993
Grant Date -
N/A
app pub date -
Oct 30, 1991
filing date -
Nov 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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