Optical system for projecting patterns comprising a constant-mag

Details Optical system for projecting patterns comprising a constant-mag Optical system for projecting patterns comprising a constant-mag

1978-04-17

1979-02-20

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 53, G03B 2734, G03B 2742

Patent

active

041403924

ABSTRACT:
The system according to the invention comprises means for displacing the lens and the object enabling magnification and focusing to be adjusted in dependence upon the lens used and co-operating with servocontrol means for the position of the lens which provide for automatic focusing while keeping magnification constant.

REFERENCES:
patent: 3625607 (1971-12-01), Bravenec
patent: 3632205 (1972-01-01), Marcy
patent: 3704657 (1972-12-01), Sliwkowski et al.
patent: 3728019 (1973-04-01), Swing

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