Method and machine for positioning an object photoelectrically u

Details Method and machine for positioning an object photoelectrically u Method and machine for positioning an object photoelectrically u

1979-08-21

1983-01-25

Rosenberger, R. A.

Optics: measuring and testing

By alignment in lateral direction

With light detector

250548, G01B 1100

Patent

active

043700594

ABSTRACT:
A method is disclosed of positioning an object photoelectrically, wherein two photoelectric detectors are placed contiguously, and then the object is moved over the detectors between them and light which is falling on them, said object being formed with a register mark on it which is of different translucency from the object, so that its passing affects the photoelectric detectors. The object is moved in a direction along a line, and when the ratio between the amounts of the register mark which cover each of the detectors (which is measured by measuring the outputs of the detectors) reaches a certain predetermined value, this movement is stopped. Several systems are also disclosed for positioning an object on a plane by using several such setups in different arrangements.

REFERENCES:
patent: 3486826 (1969-12-01), Colvin et al.
patent: 3718821 (1973-02-01), Vischulis
patent: 3819273 (1974-06-01), Unema et al.
patent: 3943359 (1976-03-01), Matsumoto et al.
patent: 3974374 (1976-08-01), Inoue

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