Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-08-11
2000-10-10
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359205, 359206, 359216, 359217, G02B 2608
Patent
active
061307688
ABSTRACT:
A scanning image forming lens in an optical scanning apparatus for optically scanning a surface to be scanned at a constant velocity by deflecting a luminous flux formed as a linear image in a direction corresponding to a main scanning direction by an optical deflector having a deflecting reflective plane in the vicinity of the linear image so as to collect the deflected luminous flux on the surface to be scanned as a light spot with a scanning image forming lens, includes two lenses. The first lens provided at the optical deflector side is a positive meniscus lens with a concave surface facing toward the optical deflector side and has a co-axial aspherical shape at both sides. The second lens provided at the surface to be scanned side is symmetrical relative to an optical axis thereof and has a non-arc shape in the deflected plane at least at one surface, and the non-arc surface is shaped such that the radius of curvature in the sub scanning cross-section changes in the direction corresponding to the main scanning direction in a manner such that the curvature center line plotting the curvature center in the sub scanning cross-section of the lens surface in the direction corresponding to the main scanning direction is a curve different from the non-arc shape in the deflected plane.
REFERENCES:
patent: 5453870 (1995-09-01), Iima
patent: 5671079 (1997-09-01), Nagasaka et al.
Phan James
Ricoh & Company, Ltd.
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