Method of controlling a lens stop position

Details Method of controlling a lens stop position Method of controlling a lens stop position

1985-09-04

1987-03-03

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 57, G03B 2734, G03B 2740

Patent

active

046471910

ABSTRACT:
A method of controlling the movement of a lens in a copying apparatus wherein the amount of lens movement is detected and the movement of the lens is corrected if necessary when the lens passes the home position. Even an error in the number of pulses counted before the lens passes the home position can be corrected because of the presence of the home position.

REFERENCES:
patent: 4488804 (1984-12-01), Takagi
patent: 4521100 (1985-06-01), Yonemori et al.
patent: 4552450 (1985-11-01), Tomosada et al.

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