Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-07-24
2007-07-24
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S206100, C359S207110, C359S216100, C347S259000
Reexamination Certificate
active
11606875
ABSTRACT:
Disclosed is an optical scanning system and an image forming apparatus having the same, wherein, in one preferred form of the invention, the optical scanning system includes a light source device, a deflecting device for scanningly deflecting a light beam from the light source device, and an imaging optical system for imaging, upon a scan surface to be scanned, the light beam deflected by the deflecting device, wherein the imaging optical system consists of a single imaging optical element with a light exit surface having a concave shape with respect to a main-scan sectional plane, and wherein relationsin-line-formulae description="In-line Formulae" end="lead"?0.5≦φm/φp≦0.9in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0<dp/kp≦0.09in-line-formulae description="In-line Formulae" end="tail"?are satisfied where φp is a power of the imaging optical element at an optical axis with respect to the main-scan direction, φm is a power of the imaging optical element at an outermost abaxial portion with respect to the main-scan direction, dp is a thickness of the imaging optical element at the optical axis, and kp is a k-θ coefficient of the imaging optical element at the optical axis.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Phan James
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