Mark detector using multiple light beams for use in a displacement detector and an image forming apparatus
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United States of America Patent
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Oct 14, 2008
Grant Date -
May 17, 2007
app pub date -
Oct 17, 2006
filing date -
Oct 17, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A mark detector to detect a plurality of marks which are arranged in a predetermined cycle on a moving member, such as a photo conductor belt, a transfer belt, a paper conveyance belt, a photo conductor drum, a transfer drum, etc. especially in an image forming apparatus, has an optical head including a light source to irradiate a light beam, a beam shaping device to shape the light beam, and a photo acceptor to accept light from the marks. Light beams on the marks from the light source have different positions shifted within a half mark cycle of each other on the marks. This increases accuracy and stability of controlling a motion of the moving member.
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