Scanning optical system

Details Scanning optical system Scanning optical system

2005-08-23

2005-08-23

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S205100, C359S212100, C359S216100, C359S217200, C359S494010, C359S490020

Reexamination Certificate

active

06934062

ABSTRACT:
A scanning optical system includes a light source that emits a plurality of beams, a deflector disposed on optical paths of the beams emitted from light source, which deflector deflects the beams toward an object surface so that beam spots formed by the beams scan on the object surface in a main scanning direction, and a birefringent double-image member disposed on the optical paths of the beams. The birefringent double-image member splits each of the beams passing therethrough into an ordinary ray and an extraordinary ray that is displaced from the ordinary ray in an auxiliary scanning direction and travels in a vicinity of the ordinary ray. Note that the auxiliary scanning direction is a direction perpendicular to the main scanning direction.

REFERENCES:
patent: 4390235 (1983-06-01), Minoura
patent: 4644160 (1987-02-01), Arimoto et al.
patent: 5436755 (1995-07-01), Guerin
patent: 57-54914 (1982-04-01), None
patent: 60126620 (1985-07-01), None

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