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US 8,045,248 B2Granted
Optical scanning device and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsNaoto Watanabe, Kenichiro Saisho, Yoshinori Hayashi
Life of this patent
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Abstract
An optical scanning device includes a light source, a light-beam splitting unit, a deflector, and a scanning optical system. The light-beam splitting unit splits a light beam from the light source into a plurality of light beams, so that the light beams are each incident to any one of reflecting surfaces of the deflector while having a phase difference of approximately π/2. The scanning optical system receives the light beams from the deflector and projects each of the light beams onto a corresponding target surface.
Claims14
An optical scanning device comprising:
- a light source that emits a light beam modulated based on image data;
- a deflector that is rotatable and includes four reflecting surfaces;
- a light-beam splitting unit that receives the light beam from the light source and splits the light beam into a plurality of light beams such that one of the plurality of light beams is incident to one of the reflecting surfaces and another of the plurality of light beams is incident to another of the reflecting surfaces;
- and
- a first scanning optical system that receives light beams from the one of the reflecting surfaces;
- and
- a second scanning optical system that receives light beams from the other of the reflecting surfaces, wherein
- when one of the first scanning optical system and the second scanning optical system guides respective light beams from a corresponding one of the reflecting surfaces to a target surface, the other of the first scanning optical system and the second scanning optical system does not guide light beams from the other of the reflecting surfaces to the target surface.
5 more elements
Dependencies are inferred from the claim text.