Device for measuring angular deviation of flat plate
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United States of America Patent
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Dec 19, 1989
Grant Date -
N/A
app pub date -
May 26, 1988
filing date -
Jul 28, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Herein disclosed is a device for accurately measuring an angular deviation of a flat plate such as a video disk and a digital audio disk. A light beam emitted from a light source is obliquely made incident on the flat plate. A light beam reflected by the flat plate is refracted by a convex lens and detected by a semiconductor position-sensitive detector. The convex lens and the position-sensitive detector are disposed in such a manner that the distance between a reflection point on the flat plate and the convex lens and the distance between the convex lens and the position-sensitive detector become two times the focal length and the focal length of the convex lens, respectively.
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