Photocopying – Contact printing – Light boxes
Patent
1988-04-07
1990-02-20
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355228, 355231, 355 67, G03G 2100, G03B 2754
Patent
active
049030787
ABSTRACT:
Imaging apparatus includes a light transparent platen for holding an original document which may be smaller than the platen. A light source illuminates the platen to expose a document on the platen. Transmittance of light through that portion of the platen not covered by a document is selectively inhibited, preferably by becoming substantially opaque. A light-blocking platen cover is movable between an operative, light blocking position and a non-use position. The light inhibiting operation is actuated when the cover is moved to its non-use position. Document recognition is used for detecting the outline of the original document on the exposure platen to control actuation of the light inhibiting operation, which is preferably effected by a liquid crystalline cell which has a pair of opposed plates, a grid of transparent electrodes interposed between the pair of plates, and a layer of crystalline material interposed between the pair of plates contacting the grid. Document recognition controls energization of the electrodes.
REFERENCES:
patent: 3726589 (1973-04-01), Difulvio et al.
patent: 3936172 (1976-02-01), McVeigh
patent: 4012122 (1977-03-01), McVeigh
patent: 4549223 (1985-10-01), Ozawa et al.
patent: 4554592 (1985-11-01), Yoshida
patent: 4673282 (1987-06-01), Sogame
patent: 4692019 (1987-09-01), Morimoto et al.
patent: 4692021 (1987-09-01), Watanabe
patent: 4695154 (1987-09-01), Watanabe
patent: 4697910 (1987-10-01), Kasuya
Xerox Disclosure Journal; Liquid Crystal Platen Masks; vol. 5, No. 5, Sep./Oct. 1980; by J. D. Rees and M. J. Lenhard.
Eastman Kodak Company
Grimley A. T.
Pipala Ed
Sales Milton S.
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