Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1993-03-12
1994-08-09
Gellner, Michael L.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 51, 355243, G03B 2734
Patent
active
053371216
ABSTRACT:
A variable magnification copier apparatus includes an optical system which incorporates two pairs of moving mirror assemblies which are moved to maintain object and image conjugate requirements following magnification changes. Also included is a constant focal length lens movable between two segments of a folded optical path. The optical system provides a magnification range of between 0.45X and 2.0X, while positioning the optical elements in a compact design. The lens does not move along the optical path, but rather remains fixed in position along one path segment so long as magnification values are selected within a certain range. When the magnification value is selected outside the predetermined range, the lens moves to an adjacent segment of the optical path and remains in a second, fixed position so long as further magnification values are selected within a second range. When a range is selected outside the second range, the lens is moved back to the first position.
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"Optical Reduction System", Xerox Disclosure Journal, vol. 5, No. 1, Jan./Feb. 1980., p. 97.
Borostyan David M.
Borostyan Stephen
Gellner Michael L.
Malley Daniel P.
Xerox Corporation
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