Focus and magnification determining and control device for varia

Details Focus and magnification determining and control device for varia Focus and magnification determining and control device for varia

1984-08-17

1985-12-10

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 59, G03B 2734

Patent

active

045575932

ABSTRACT:
A variable magnification type copying machine has a zoom lens disposed between a platen and a photosensitive surface, the zoom lens being composed of a plurality of movable lenses. A chart located on the platen in a position not to interfere with the placement of an original on the platen projects an image of itself into a line sensor. The line sensor outputs video determination signals indicative of the focus and magnification of the zoom lens. The magnification determination signals operate a stepping motor which positions the zoom lens for the desired magnification. The focus determination signals operate a stepping motor to adjust the distance between movable lens to obtain optimum focus.

REFERENCES:
patent: 4322159 (1982-03-01), Takahashi et al.
patent: 4335953 (1982-06-01), Tsuchiya et al.
patent: 4383274 (1983-05-01), Inuiya

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