Optical scanning device

Details Optical scanning device Optical scanning device

1999-01-13

2000-08-15

Spyrou, Cassandra

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359204, 347239, G02B 2608

Patent

active

061045241

ABSTRACT:
A polygon mirror 36 have reflecting surfaces being arrayed such that the reflecting surfaces each having coatings 38 at both ends thereof and the reflecting surfaces having no coating are alternately arrayed. A beam width of a light beam reflected by a coating facet 36A is smaller than a beam width of a light beam by a non-coating facet 36B. Alight beam (first light beam) is deflected by the coating facet 36A, and it lands on a photoreceptor. A light beam (second light beam) is deflected by the non-coating facet 36B, and it lands on the photoreceptor. At this time, a beam diameter of the first light beam on the photoreceptor in the first scan direction is larger than that of the second light beam. When the laser beam is deflected by the non-coating facet 36B, the laser beam is modulated by image data. When it is deflected by the coating facet 36A, the laser beam is modulated by bias data. Both the laser beams are projected to over the entire surface of a projected object within the scanning area, whereby an electrostatic latent image of high contract is formed on the object surface.

REFERENCES:
patent: 5223700 (1993-06-01), Takenaka
patent: 5353048 (1994-10-01), Kanai
patent: 5355244 (1994-10-01), Suzuki et al.

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