Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-02-23
1997-07-15
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359206, 359208, 359216, 359217, G02B 2608
Patent
active
056488645
ABSTRACT:
An image forming optical system for an equal speed scan converges a deflected light beam as a light spot onto a scanned face to perform an optical scanning operation at an equal speed. The image forming optical system has an f.theta. lens having an f.theta. function in a main scan-corresponding direction and converging the deflected light beam onto the scanned face in the main scan-corresponding direction. The image forming optical system also has a concave reflecting mirror having positive refracting power only in a cross scan-corresponding direction and converging the deflected light beam onto the scanned face in the cross scan-corresponding direction in cooperation with the f.theta. lens. A radius of curvature of the concave reflecting mirror in the cross scan-corresponding direction is increased from a central region thereof toward both end portions of the concave reflecting mirror in a longitudinal direction thereof in accordance with a predetermined formula of the second degree at a deflection angle .theta. of the deflected light beam deflected by the rotary polygon mirror.
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Phan James
Ricoh & Company, Ltd.
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