Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1993-03-19
1994-11-29
Gellner, Michael L.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 55, 355 60, 355243, G03B 2734
Patent
active
053694651
ABSTRACT:
There is provided an image forming apparatus having a magnification varying function for adjusting a lateral magnification and focus by varying the positions of a lens and a mirror of an exposure optical system for forming an image of an original on a photosensitive drum. The apparatus comprises number keys and a print key for inputting data for setting an image formation magnification, data on the lateral magnification, and data on focus adjustment, a pulse motor for moving the lens and the mirror on the basis of the data input by the number keys and print key, an interrupt key for inputting position data on the lens and the mirror when a minimum reduction magnification and a maximum enlargement magnification are input by the number keys and print key, the lens and the mirror are moved by the pulse motor, and the lateral magnification and the focus are adjusted, a memory unit for storing the position data input by the interrupt key, and a control unit for calculating a coefficient for correcting a difference in optical path length due to a variation in lens characteristics, on the basis of the position data stored in the memory unit, and calculating the positions of the lens and the mirror by substituting the coefficient when the image formation magnification is input by the ten keys.
REFERENCES:
patent: 4332877 (1982-06-01), Tabata
patent: 4514080 (1985-04-01), Matsuzawa et al.
patent: 4561758 (1985-12-01), Nawata et al.
patent: 4845526 (1989-07-01), Ito
Gellner Michael L.
Kabushiki Kaisha Toshiba
Malley Daniel P.
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