Optical scanning device and image forming apparatus

Details Optical scanning device and image forming apparatus Optical scanning device and image forming apparatus

2009-02-27

2009-11-17

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

C359S205100, C359S212100, C359S216100, C347S232000, C347S259000

Reexamination Certificate

active

07619796

ABSTRACT:
An aperture has an aperture opening that transmits a predetermined portion of a light beam. A phase optical element changes a phase of a portion of a light beam. A scanning lens focuses the light beam into a beam spot on a scanning surface. The phase optical element has a function of increasing light intensity of a side-lobe of the scanning beam near the scanning surface. The aperture opening is set to satisfy 0.03≦(SR−SA)/SR≦0.20, where SR and SA are areas of a rectangle circumscribing the aperture opening and the aperture opening, respectively. The function of the phase optical element and the aperture expand a depth allowance of the beam spot.

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