Copy camera focusing

Details Copy camera focusing Copy camera focusing

1981-07-15

1982-12-28

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

354198, 355 77, G03B 2736, G03B 2738

Patent

active

043658911

ABSTRACT:
A copy camera has a lens board positioned by a lens lead screw and a copyboard positioned by a copyboard lead screw. A ratio-selecting knob rotates the shaft of a lens counter that is connected by a flexible coupling to spur gears that rotate the lens feed screw so that the count in the lens counter corresponds to the ratio of image size to object size. Spur gears intercouple the lens counter shaft to the tape advance drum that carries a tape with numbers denoting a copyboard counter setting for establishing an object distance between copyboard and lens for maintaining an object at that distance in sharp focus for attaining the ratio indicated in the lens counter. A copyboard setting knob rotates the copyboard counter shaft that is connected by a flexible coupling to the copyboard lead screw to enable an operator to set the copyboard counter to the value displayed on the tape drum. A one-way switch causes a lightbulb to illuminate the number displayed by the tape drum for each whole percent setting of the lens counter.

REFERENCES:
patent: 3832058 (1974-08-01), Gusovius

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