Light beam scanning device and image forming apparatus

Details Light beam scanning device and image forming apparatus Light beam scanning device and image forming apparatus

2006-10-31

2006-10-31

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C347S261000

Reexamination Certificate

active

07130096

ABSTRACT:
An effective scanning range of laser light in a scanning direction is configured so that a center position of the effective scanning range is displaced by a distance β along the scanning direction from an optical axis f an fθ lens. The incidence angle α between a center of luminous flux of the laser light on a deflection surface of polygon mirror and the optical axis of the fθ lens can beset to satisfy a relational expression (4π/N)−(W/D)≦|α|<(4π/N)−{(W−β)/D}.

REFERENCES:
patent: 4993792 (1991-02-01), Minoura
patent: 5191463 (1993-03-01), Minoura
patent: 2002/0196514 (2002-12-01), Atsuumi et al.
patent: B2 03-005562 (1991-01-01), None

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