Light scanning unit and image forming apparatus employing...

Details Light scanning unit and image forming apparatus employing... Light scanning unit and image forming apparatus employing...

2007-08-02

2008-08-05

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C347S259000

Reexamination Certificate

active

07408689

ABSTRACT:
A light scanning unit includes a light source which emits light beam with a predetermined wavelength, a beam deflector which deflects and scans the light beam emitted by the light source toward a photosensitive body, and an f-θ lens which has at least one plastic lens and forms an image for the light deflected by the beam deflector on the photosensitive body, the light scanning unit satisfying a following formula0<Lmax−Lmin≦[20×(cos θ)5+10]×λ/(5×10−4) where Lmax and Lmin respectively represent a maximum value and a minimum value of a total light passing distance from a light axis of at least one plastic lens according to a deflection angle, θ is an angle formed between a polarization direction of the light beam emitted by the light source and a sub-scanning direction, and λ is a wavelength of the light beam emitted by the light source.

REFERENCES:
patent: 6760138 (2004-07-01), Shimomura
patent: 7068406 (2006-06-01), Shimomura

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