Optical deflector, optical scanner, and image forming apparatus

Details Optical deflector, optical scanner, and image forming apparatus Optical deflector, optical scanner, and image forming apparatus

2009-02-12

2009-10-13

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S200200, C359S204100, C359S216100

Reexamination Certificate

active

07602540

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:12⁢⁢π⁢⁢3⁢π⁢⁢Er44⁢⁢ml3≤2×P60⁢⁢and⁢⁢0.8≤t≤1.8.

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