Optical apparatus for optical pickup
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United States of America Patent
Stats
-
Jul 16, 1991
Issued Date -
N/A
app pub date -
Apr 13, 1990
filing date -
Apr 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical apparatus of an optical pickup including a semiconductor laser, a collimate lens to obtain a parallel light from a laser beam emitted from said semiconductor laser, an objective for collecting on a recording surface of an optical disk the parallel light obtained through the collimate lens, and a light receiving element for detecting a reflection light reflected on the recording surface of the optical disk wherein a numeric aperture NA of said collimate lens is set as 0.14
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