Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1987-05-06
1989-02-21
Prescott, A. C.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 8, 355 14E, 355 67, 355 71, G03G 1500
Patent
active
048069892
ABSTRACT:
The present invention provides an optical correction device capable of correcting an exposure distribution so as to be flat at an image receiving surface such as a photoreceptor of copying machine, in spite of varying a projection magnification of original image on the image receiving surface. Additionally, the optical correction device can correct an exposure amount on the image receiving surface so as to be substantially same level throughout all available magnifications.
REFERENCES:
patent: 3967894 (1976-07-01), Tsilibes
patent: 4072413 (1978-02-01), Amess
patent: 4172658 (1979-10-01), Tani et al.
patent: 4716442 (1987-12-01), Yazaki
Fujii Yozo
Saito Taku
Konishiroku Photo Industry Co,., Ltd.
Lau Jane
Prescott A. C.
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