Optical deflector, optical scanner, and image forming apparatus
AssigneesRicoh Company, Ltd., Tohoku Ricoh CC., Ltd.
InventorsKensuke Masuda, Yukio Itami, Yoshihiro Takahashi, Tomotaka Takamura
Life of this patent
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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: 1 2 π 3 π Er 4 4 ml 3 ≤ 2 × P 60 and 0.8 ≤ t ≤ 1.8 .
Claims16
An optical deflector comprising:
- a rotary body that includes a polygon mirror;
- a rotation shaft that is fixed to the rotary body and rotates together with the rotary body;
- a bearing unit that rotatably supports the rotation shaft;
- and
- a board to which the bearing unit is fixed, wherein
- the following inequalities are satisfied:
- 1
- 2
-
-
- π
-
-
- 3
-
- π
-
-
- Er
- 4
- 4
-
-
- ml
- 3
- ≤
- 2
- ×
- P
- 60
-
-
- and
-
-
- 0.8
- ≤
- t
- ≤
- 1.8
- ,
- where P [revolution per minute] is number of revolutions of the rotary body, l [meter] is a distance between a center of gravity of the rotary body and the board, m [kilogram] is mass of the rotary body, r [meter] is a radius of the rotation shaft, E [pascal] is Young's modulus of the rotation shaft, and t [millimeter] is a thickness of the board.
An optical deflector comprising:
- a rotary body that includes a polygon mirror;
- a rotation shaft that is fixed to the rotary body and rotates together with the rotary body;
- a bearing unit that rotatably supports the rotation shaft;
- and
- a board to which the bearing unit is fixed, wherein
- the following inequalities are satisfied:
- 1
- 2
-
-
- π
-
-
- 3
-
- π
-
-
- r
- 4
- 4
-
-
- ml
- 3
- ≤
- 5.41
- ×
- 10
- -
- 8
- ×
- P
-
-
- and
-
-
- 0.8
- ≤
- t
- ≤
- 1.8
- ,
- where P [revolution per minute] is number of revolutions of the rotary body, l [meter] is a distance between a center of gravity of the rotary body and the board, m [kilogram] is mass of the rotary body, r [meter] is a radius of the rotation shaft, and t [millimeter] is a thickness of the board.
Dependencies are inferred from the claim text.