Optical scanner and image forming apparatus

Details Optical scanner and image forming apparatus Optical scanner and image forming apparatus

2007-09-04

2007-09-04

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S207110, C359S216100, C359S204200, C347S259000, C347S261000

Reexamination Certificate

active

11006640

ABSTRACT:
The over-field type optical scanner includes a first imaging optical system disposed between a light source and a rotating polygon mirror for forming, on one surface of the rotating polygon mirror, a linear image with a width larger than a width along a main scanning direction of the one surface of the rotating polygon mirror; and a second imaging optical system composed of a curved mirror for focusing, on a scan surface, a light beam having been reflected by the rotating polygon mirror. The first imaging optical system includes a first conversion optical system for converting the light beam emitted from the light source into a divergent light beam with respect to the main scanning direction and into a convergent light beam with respect to the sub scanning direction; and a second conversion optical system having a refracting power in the main scanning direction.

REFERENCES:
patent: 6185029 (2001-02-01), Ishihara
patent: 9-304720 (1997-11-01), None
patent: 2000-19443 (2000-01-01), None

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