The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2009
Filed:
Feb. 12, 2009
Kensuke Masuda, Tokyo, JP;
Yukio Itami, Kanagawa, JP;
Yoshihiro Takahashi, Miyagi, JP;
Tomotaka Takamura, Miyagi, JP;
Kensuke Masuda, Tokyo, JP;
Yukio Itami, Kanagawa, JP;
Yoshihiro Takahashi, Miyagi, JP;
Tomotaka Takamura, Miyagi, JP;
Ricoh Company, Limited, Tokyo, JP;
Tohoku Ricoh CC., Ltd., Shibata-gun, JP;
Abstract
An optical deflector includes a rotary body including a polygon mirror; a rotation shaft fixed to the rotary body; a bearing unit rotatably supporting the rotation shaft; and a board to which the bearing unit is fixed. Where P [rpm] is the number of revolutions of the rotary body, l [m] is a distance between a center of gravity of the rotary body and the board, m [kg] is mass of the rotary body, r [m] is a radius of the rotation shaft, E [Pa] is Young's modulus of the rotation shaft, and t [mm] is a thickness of the board, the following inequalities are satisfied: