Tracking error detecting system for optical head
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United States of America Patent
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Oct 4, 1988
Grant Date -
N/A
app pub date -
Jun 13, 1986
filing date -
Oct 15, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to a tracking error system of an optical head of the present invention, a pair of beams are irradiated through an objective lens (4) on an optical record medium (5) with a distance of a multiple of an odd number of substantially 1/2 the track pitch thereof, a pair of beams emitted from the optical record medium (5) are respectively introduced into a pair of two-divided photo detection elements (6.sub.1) and (6.sub.2) and a tracking error signal is obtained from a difference between difference outputs between outputs of both detected outputs from the pair of respective two-divided photo detection elements (6.sub.1) and (6.sub.2). Thus, it is possible to remove a DC fluctuation of a tracking error signal caused by the lateral movement of the objective lens (4) and a radial skew of the optical record medium (5).
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