Mechanism to open and close iris on lens

Details Mechanism to open and close iris on lens Mechanism to open and close iris on lens

1976-06-14

1977-09-13

Gonzales, John

Photocopying

Contact printing

Light boxes

354196, 355 58, 355 71, G03B 2300

Patent

active

040486419

ABSTRACT:
Some photocomposition machines use optics with a variable magnification lens, usually referred to as a variator lens. Because larger size print requires more lumens of power for proper exposure of the photosensitive sheets used in photocomposition machines, the common practice is to employ an iris diaphragm which is coordinated with the size of the projected image. The ratio of the diaphragm opening to the focal length is referred to as the f-number.
The invention shows an improved cam operated iris control wherein the cam-to-follower pressure angle is maintained at a minimum and provides a means for enabling the cam follower to traverse the entire cam without binding as the cam follower carriage is moved relative to the driving cam.

REFERENCES:
patent: 2670665 (1954-03-01), Caldwell
patent: 3314350 (1967-04-01), Husum
patent: 3883244 (1975-05-01), Whitaker et al.
patent: 4008480 (1977-02-01), Szabo

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