Optical apparatus for changing magnification or reduction rates

Details Optical apparatus for changing magnification or reduction rates Optical apparatus for changing magnification or reduction rates

1981-08-28

1983-08-09

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

350255, 350427, 350429, 354197, G03B 2736, G03B 2738

Patent

active

043975445

ABSTRACT:
A main lens carriage holding a main lens assembly is moved along the optical path by a cam cylinder. A supplemental lens element is operatively coupled with the main lens assembly at the proper position to attain the desired optical reduction ratio. When the main lens assembly deviates from the proper position, a main lens support frame is shifted along the optical path in and relative to the main lens carriage by a correcting mechanism so as to correct the deviation. A further supplemental lens element is provided, but does not move with the main lens assembly. Both supplemental lens elements swing into and out of the optical path under cam action; and further cam action is provided to ensure that the two swinging lens elements do not collide with each other. The main lens support frame is rapidly moved along the optical path by the cam action of a rotating cylinder having a cam groove having part-circular portions that define the desired dwell positions and having open ends.

REFERENCES:
patent: 3632072 (1972-08-01), Hess et al.
patent: 3850507 (1974-11-01), Uesugi
patent: 4048641 (1977-09-01), Cieplik et al.
patent: 4083057 (1978-04-01), Quinn
patent: 4099866 (1978-07-01), Jones et al.

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