Optical scanner, and image reading apparatus and image forming a

Details Optical scanner, and image reading apparatus and image forming a Optical scanner, and image reading apparatus and image forming a

1999-12-14

2000-10-24

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359206, 359216, 359217, G02B 2608

Patent

active

061376175

ABSTRACT:
A high-performance optical scanner in which the f.theta. characteristics and the field curvature are compensated excellently by shifting an optical deflector by an optimum amount and using a collecting lens that can be processed easily. The optical scanner includes, in one embodiment: a semiconductor laser 1; a polygon mirror 4 as an optical deflector; a cylindrical lens 3 as a first imaging optical system; and a correcting lens 6 as a second imaging optical system formed of one correcting lens having a curved-axis toric surface. A formula of 0.15<{.DELTA.X.multidot.cos (.alpha./2)}/rp<0.35 is satisfied, wherein .DELTA.X indicates a shift amount that is the distance between a reflecting point at a scanning center and the center of a deflecting plane, .alpha. represents an angle of reflection on the deflecting plane at the scanning center, and rp denotes the radius of an inscribed circle in the polygon mirror 4. Thus, the asymmetry in field curvature in the main scanning direction caused by the oblique incidence of light onto the deflecting plane and in f.theta. characteristics can be compensated merely by the shift of the optical deflector.

REFERENCES:
patent: 5111219 (1992-05-01), Mikino
patent: 5329399 (1994-07-01), Ho
patent: 5600475 (1997-02-01), Mochizuki et al.
patent: 5875051 (1999-02-01), Suzuki et al.

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