Automatic bias and registration control system for electrophotog

Details Automatic bias and registration control system for electrophotog Automatic bias and registration control system for electrophotog

1979-10-22

1981-12-08

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 8, 355 14SH, G03G 1500

Patent

active

043044867

ABSTRACT:
In an optical imaging system for an electrophotographic copier, a photodetector intercepts a portion of unfocused light being reflected toward the photoconductive surface. An electronic circuit generates a biasing voltage for the copier development electrode which varies with the amount of light incident on the photodetector a set time after the photodetector receives a distinctively intense light pulse reflected from a high-reflectivity strip positioned ahead of the document being copied. The time delay insures that the light which determines the bias voltage has been reflected from the main body of the document. The light pulse from the high reflectivity strip can also independently actuate the copy paper feed mechanism to insure proper image registration.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3241466 (1966-03-01), Clark
patent: 3438705 (1969-04-01), King
patent: 3888579 (1975-06-01), Rodek et al.
patent: 3947117 (1976-03-01), Basu et al.
patent: 4009957 (1977-03-01), Suzuki et al.
patent: 4026647 (1977-05-01), Kanno et al.
patent: 4050806 (1977-09-01), Miyakawa et al.
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4215930 (1980-08-01), Miyakawa et al.

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