Optical scanner and image formation apparatus

Details Optical scanner and image formation apparatus Optical scanner and image formation apparatus

2005-08-30

2005-08-30

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

C359S204200, C359S205100, C359S207110, C359S212100, C359S216100

Reexamination Certificate

active

06937371

ABSTRACT:
An optical system includes three optical systems. The first has a coupling lens. The second includes a lens having a positive power in a vertical scanning direction and forms the light flux into a line image extending in the horizontal scanning direction on a deflector. The third includes a first lens having a positive power in the horizontal scanning direction, and a second lens having a positive power in the vertical scanning direction. Lateral magnification in the horizontal scanning direction is set larger than that in the vertical scanning direction. Temperature near the first lens is maintained higher than that near the second lens.

REFERENCES:
patent: 5673136 (1997-09-01), Inoue et al.
patent: 5818622 (1998-10-01), Hisa
patent: 6195190 (2001-02-01), Tachibe et al.
patent: 2804647 (1993-01-01), None
patent: 2736984 (1998-04-01), None

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