发明公开
EP1353231A2 Method and system for focus control in imaging engine with spatial light modulator.
审中-公开
在einer中的Verfahren und System zur Fokuskontrolle Bebilderungseinrichtung miträumlichemLichtmodulator
- 专利标题： Method and system for focus control in imaging engine with spatial light modulator.
- 专利标题（中）： 在einer中的Verfahren und System zur Fokuskontrolle Bebilderungseinrichtung miträumlichemLichtmodulator
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申请号： EP03100928.5申请日： 2003-04-07
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公开(公告)号： EP1353231A2公开(公告)日： 2003-10-15
- 发明人: Comeau, Bryan , Bailey, Dwayne , Allen, Roy , Romano, David
- 申请人： Agfa Corporation
- 申请人地址： 100 Challenger Road Ridgefield Park, NJ 07660-2199 US
- 专利权人： Agfa Corporation
- 当前专利权人： Agfa Corporation
- 当前专利权人地址： 100 Challenger Road Ridgefield Park, NJ 07660-2199 US
- 代理机构： Van Ostaeyen, Marc Albert Jozef
- 优先权： US117775 20020405
- 主分类号： G03F7/20
- IPC分类号： G03F7/20
摘要：
A calibration system for a platesetter or imagesetter is applicable to systems that have a media drum (110) and a carriage (120), including a light source (122) and a spatial light modulator (130) for selectively exposing the media (12) that is held against the drum (110). The invention can be applied to internal or external drum systems. The calibration system comprises a calibration sensor (150) that is scanned relative to the spatial light modulator (130). The controller (131) then analyzes the response of the calibration sensor (150) to generate calibration information that is used to configure the spatial light modulator (130). The use of this calibration sensor allows for job-to-job calibration of the spatial light modulator (130), in one example, that ensures the generation of a high quality images, without banding, for example, on the media. This calibration system is also used to detect a best focus position for projection optics by measuring a contrast ratio between exposure (912) and dark levels (910) for various focus settings. It selects the best focus position in response to the contrast ratio (912/910).
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