Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1998-12-29
2000-12-19
Adams, Russell
Photocopying
Projection printing and copying cameras
Multicolor picture
355 35, 347224, 347232, 347239, 347241, G03B 2732, G03B 2772, B41J 2435, B41J 247
Patent
active
061633631
ABSTRACT:
A digital photograph printer comprising a transport mechanism, a modulated light source (1206), and an exposure controller (1302). The transport mechanism for advancing a photosensitive medium (1202) through an exposure region (1200) such that said photosensitive medium advances one row of pixel locations each row period. The modulated light source (1206) is operable to selectively provide a beam of light to an array of individually modulated regions (1300, 1306, 1310) in an exposure region (1200). As the photosensitive medium (1202) moves through the exposure region (1200) the individually modulated regions in the exposure region (1200) have the opportunity to expose each pixel locations in the exposure region (1200) once each row period. The exposure controller (1302) operable to control the modulated light source (1206) based on image data provided to modulated light source. The image data comprises optical density data for each pixel in an image to be formed on the photosensitive medium for each of at least three primary colors. The controller selectively exposes the photosensitive medium at a number of exposure opportunities, each selective exposure performed for a period no greater than 50% of the row time, and the duration of at least two of the exposure periods having a non-binary relationship.
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Frick Beat
Nelson William E.
Adams Russell
Brady III Wade James
Brill Charles A.
Fuller Rodney
Gretag Imaging AG
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