Focus error detection device for an optical recording/playing back system
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United States of America Patent
Stats
-
Apr 14, 1987
Grant Date -
N/A
app pub date -
Oct 18, 1984
filing date -
Oct 19, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focus error detection device to be used in an optical system for recording and/or playing back information, including a light detector made up of four light receiving elements arranged symmetrically with respect to the center of the light detector, a first operation circuit means connected to the light receiving elements for generating a focus error signal, and a second operation circuit means also connected to the light receiving elements for generating an off-set compensation signal. With this construction, and off-set of the focus error signal due to the deviation of the position of the reflection light beam is by far reduced as compared with the conventional devices.
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