Apparatus for determining registration of imaging members

Details Apparatus for determining registration of imaging members Apparatus for determining registration of imaging members

1993-08-23

1994-11-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, G01N 2186

Patent

active

053650743

ABSTRACT:
An apparatus is useful for positioning a substrate having an aperture therein movable in a process direction. A photodetector is disposed adjacent a first side of the substrate, in a position intersecting a path of the aperture along the process direction. A first light source point and a second light source point are positioned whereby, when the aperture is disposed between the first light source point and the second light source point and the photodetector, direct light from both the first light source point and the second light source point is capable of being detected by the photodetector. A condition detector detects a condition in which light of substantially equal intensity from the first light source point and the second light source point is detected by the photodetector.

REFERENCES:
patent: 3875406 (1975-04-01), Holeman
patent: 4422026 (1983-12-01), Starai
patent: 4683380 (1987-07-01), Shipkowski et al.
patent: 4837636 (1989-06-01), Daniele et al.
patent: 5175570 (1992-12-01), Haneda et al.
patent: 5204538 (1993-04-01), Genovese

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