Focal adjustment on a single-focus lens in a continuously variab

Details Focal adjustment on a single-focus lens in a continuously variab Focal adjustment on a single-focus lens in a continuously variab

1976-12-08

1978-07-11

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2736

Patent

active

040998665

ABSTRACT:
Method and apparatus for adjusting the position of a single-focus lens at two positions in a continuously variable reduction document copier machine. Adjustment is made at a 1:1 ratio by shifting the position of the lens on its carriage and adjusting the position of optical path mirrors until focus is obtained. Adjustment is made at a nominal 0.647 reduction ratio by adjusting the position of the lens carriage until focus is obtained. Apparatus is disclosed which provides the second adjustment without affecting the position of the lens at the first adjustment position.

REFERENCES:
patent: 3625607 (1971-12-01), Bravenec
patent: 3778147 (1973-12-01), Reehil et al.
patent: 3873189 (1975-03-01), Whitaker et al.

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