Mark detecting device for detecting the center of a mark by dete

Details Mark detecting device for detecting the center of a mark by dete Mark detecting device for detecting the center of a mark by dete

1989-04-11

1989-12-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, 356400, G01N 2186

Patent

active

048869740

ABSTRACT:
A mark detecting device detects a mark in accordance with an electric signal obtained by photoelectrically converting the scatteringly reflected lights from edges of the mark. More particularly, the device detects the center of the mark in accordance with a photoelectrically obtained signal while taking, into account, the degree of asymmetry of the signal obtained at the time of optical scanning of the mark. By doing so, the center of the mark where it is formed on an object having a transparent surface layer, can be photoelectrically detected very accurately, substantially without being adversely affected by the transparent surface layer.

REFERENCES:
patent: 3943359 (1976-03-01), Matsumoto et al.
patent: 4504148 (1985-03-01), Kuroki et al.
patent: 4663534 (1987-05-01), Ayata et al.
patent: 4677301 (1987-01-01), Tanimoto et al.
patent: 4688088 (1987-08-01), Hamazaki et al.

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