Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-11-28
2006-11-28
Robinson, Mark A. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S206100, C347S259000
Reexamination Certificate
active
07142339
ABSTRACT:
A multi-beam optical scanning apparatus includes a light source in which a plurality of light emitting regions are located at an interval in a main scanning direction, an incident optical system for allowing light beams emitted from the light source to enter a deflector with a state in which a width of the light beams is wider than that of a deflection surface of the deflector in the main scanning direction, and an imaging optical system for imaging the light beams which are reflected and deflected on the deflector on a surface to be scanned. The incident optical system includes a condensing optical system for changing a state of the light beams emitted from the light source. A back focal position of the condensing optical system in the main scanning direction is located on the deflection surface or in its vicinity. Provided are a multi-beam optical scanning apparatus capable of reducing an illuminance difference between the light beams at the same image height on the surface to be scanned to form an image having no unevenness in density, a high resolution, and a high quality; and an image forming apparatus using the device.
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Fitzpatrick ,Cella, Harper & Scinto
Robinson Mark A.
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