Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1996-09-10
1999-03-02
Rutledge, D.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 71, 355 37, 355 32, 355 69, 359 84, 359 86, G03B 2752
Patent
active
058778462
ABSTRACT:
A photographic printer for displaying an image on a liquid crystal panel, irradiating the light from a light source on said liquid crystal panel and exposing said image on a photosensitive material for a predetermined exposure time by the light transmitted through said liquid crystal panel is disclosed. Further, a method for controlling an exposure in such a photographic printer is disclosed. Before displaying an image on the liquid crystal panel, the drive voltage for producing a predetermined transmitted light amount is measured. On the basis of the difference between the measured voltage and the theoretical voltage for producing the predetermined transmitted light amount, an offset value of the drive voltage is adjusted. Accordingly, the operational error of the printer due to temperature change, due to the difference of the light transmittance between crystal panels, or due to the difference of the characteristic of voltage v.s. light transmittance between crystal panels is reduced.
REFERENCES:
patent: 4571053 (1986-02-01), Kasama et al.
patent: 5122831 (1992-06-01), Suzuki
patent: 5703671 (1997-12-01), Narita et al.
Katakura Kazuhiko
Tahara Shuji
Terajima Akirou
Fuji Photo Film Co. , Ltd.
Rutledge D.
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