Optical scanning device and image forming apparatus
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United States of America Patent
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May 28, 2013
Grant Date -
Aug 6, 2009
app pub date -
Feb 2, 2009
filing date -
Feb 5, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A pre-deflector optical system includes an isolator arranged on an optical path of a light beam from a light source. The isolator has a first surface with different light transmittances depending on a polarization state of an incident light beam on a first side close to the light source and a second surface imparting an optical phase difference of a ¼ wavelength to the incident light beam on a second side. A deflector deflects the light beam passed through the pre-deflector optical system. A rotation mechanism rotates the isolator around its optical axis. A holding member holds the light source and the isolator in a predetermined positional relationship.
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