Device for measuring angular deviation of flat plate

Details Device for measuring angular deviation of flat plate Device for measuring angular deviation of flat plate

1988-05-26

1989-12-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250230, G01N 2186

Patent

active

048884910

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.

REFERENCES:
patent: 3667846 (1972-06-01), Nater et al.
patent: 4453083 (1984-06-01), Bohlander et al.
patent: 4589773 (1986-05-01), Ido et al.
patent: 4673817 (1987-06-01), Oomen

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