Optical device, optical scanning apparatus and image forming apparatus
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United States of America Patent
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May 21, 2013
Grant Date -
Oct 27, 2011
app pub date -
Apr 12, 2011
filing date -
Apr 23, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An optical device includes at least one surface emitting laser device having a dielectric film for causing a central portion of a light emitting region to have a comparatively higher reflectivity than a peripheral portion; a light receiving element disposed, with respect to a first direction, on one side to the surface emitting laser device; and a transparent member disposed in a path of light emitted from the surface emitting laser device and configured to reflect a portion of the light toward the light receiving element as monitoring light. The central portion has shape anisotropy in which a width measured on a line extending in the first direction and passing through the center of the light emitting region is smaller than a width measured on a line extending in a second direction, which is perpendicular to the first direction, and passing through the center of the light emitting region.
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