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US Patent 7760227 Deflector, optical scanning unit, and image forming apparatus

Patent 7760227 was granted and assigned to RICOH COMPANY,LTD. on July, 2010 by the United States Patent and Trademark Office.

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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7760227
Patent Inventor Names
Tomohiro Nakajima1
Date of Patent
July 20, 2010
Patent Application Number
11765166
Date Filed
June 19, 2007
Patent Primary Examiner
‌
Hai C Pham
Patent abstract

A deflector includes a vibrating mirror supported by a torsion beam provided as a rotational axis and reciprocally scanning a beam from a light emitting source; and a rotational part configured to give a rotational torque to the vibrating mirror for making oscillation. The rotational part generates the rotational torque along one side separated from the rotational axis by length R in a direction perpendicular to the rotational axis. The vibration mirror has relationships ofR<r,D>d,and D≧d·(r/R)^2where width in a direction perpendicular to the rotational axis of a mirror part that is a part of the vibrating mirror is 2r; width in a direction parallel with the rotational axis of the mirror part is d; and width of the separated one side causing generation of the rotational torque is D.

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