Optical scanner

Details Optical scanner Optical scanner

2005-02-01

2005-02-01

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

06850350

ABSTRACT:
An optical scanner according to the present invention comprises a collimator lens, a cylindrical lens, a light deflector, an f-θ lens and an anamorphic lens. The f-θ lens is constituted by three groups of five lenses, i.e., a first cemented lens formed by bonding a first lens and a second lens to each other, a second cemented lens formed by boding a third lens and a fourth lens to each other and a fifth lens having positive refracting power. The f-θ lens is formed to satisfy relational expressions L/f<0.100 and 0.04≦r1/r4≦0.31, where L represents the total length of the f-θ lens, f represents the focal distance of the f-θ lens, r1 represents the radius of curvature of an entrance-side refracting interface of the first lens and r4 represents the radius of curvature of an entrance-side refracting interface of the third lens. Thus, a compact optical scanner comprising an f-θ lens having a small total length L and high optical performance is provided also when increasing a focal length f as well as a scanning line length W.

REFERENCES:
patent: 5493446 (1996-02-01), Nakajima
patent: 0 412 037 (1991-02-01), None
patent: 0 506 338 (1992-09-01), None
patent: 03-249722 (1991-11-01), None
patent: 07120670 (1995-05-01), None
patent: 08029714 (1996-02-01), None
patent: P3024906 (2000-01-01), None

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