Method for determining phase of rotating polygonal mirror used in image forming apparatus
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United States of America Patent
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Sep 4, 2018
Grant Date -
Jan 18, 2018
app pub date -
Jun 20, 2017
filing date -
Jul 13, 2016
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Abstract
A rotating polygonal mirror has deflection faces for deflecting a light beam. A motor drives the polygonal mirror. A first detection unit outputs a first signal by detecting a light beam. A second detection unit outputs a second signal whose period is different from a period of the first signal, by detecting magnetic flux change. A specifying unit obtains a phase relationship between the first signal and the second signal, and specifies a deflection face. A storage unit stores setting information for setting whether to use rising or falling of the second signal to specify the phase relationship. The specifying unit determines whether to use rising or falling of the second signal in order to obtain the phase relationship.
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