Optical scanner and image formation apparatus including the...

Details Optical scanner and image formation apparatus including the... Optical scanner and image formation apparatus including the...

2006-10-17

2006-10-17

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07123395

ABSTRACT:
In an overfilled optical scanner in which a plurality of light beams are used, a uniform luminous-energy distribution is achieved on a scanning plane to be scanned. The optical scanner includes: a light source3for producing a first light beam L1and a second light beam L2; a polygon mirror; a first image formation optical system for leading the light beams L1and L2to a deflecting plane of the polygon mirror and for forming, on the deflecting plane, a line image whose width is greater than the plane width of the deflecting plane; and a second image formation optical system for leading the light beams L1and L2from the polygon mirror to the scanning plane of a photosensitive drum and forming an image on the scanning plane. The first image formation optical system is adjusted so that the optical axes A1and A2of the first and second light beams L1and L2are approximately symmetrical about the optical axis A0of the first image formation optical system. The powers of the first and second light beams L1and L2are thus balanced with each other on the scanning plane.

REFERENCES:
patent: 6507427 (2003-01-01), Yamawaki
patent: 2002/0018112 (2002-02-01), Nishiguchi et al.
patent: 2003/0156183 (2003-08-01), Ishihara
patent: 09-096769 (1997-04-01), None
patent: 2001-166239 (2001-06-01), None

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