Spectrophotometer for color printer color control with displacement insensitive optics
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United States of America Patent
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May 7, 2002
Issued Date -
N/A
app pub date -
Mar 23, 2000
filing date -
Nov 24, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An improved spectrophotometer for non-contact measuring of the colors of colored target areas, especially, test patches on moving printed test sheets in an unrestrained normal output path of a color printer, which test patches may be sequentially angularly illuminated with multiple different colors, with a photosensor providing electrical signals in response, the spectrophotometer having a lens system for transmitting that reflected illumination from the test patch to the photosensor with a lens magnification ratio of approximately one to one. The exemplary spectrophotometer provides noncontact color measurements of moving color target areas variably displaced therefrom within normal paper path baffle spacings, with a displacement insensitivity of at least 6 millimeters about a nominal target to spectrophotometer separation.
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