Scanning lens and an optical scanner using the same

Details Scanning lens and an optical scanner using the same Scanning lens and an optical scanner using the same

1996-01-16

1998-01-20

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359216, 359217, 359662, 359718, G02B 2608

Patent

active

057106541

ABSTRACT:
Improved optical scanner comprises semiconductor laser 10, aperture 12, collimator 14, cylindrical lens 16, polygonal mirror 18 and single-element f.theta. lens 22 which is formed of an amorphous polyolefin as a plastic material. Surface S1 of f.theta. lens 22 which is on the side adjacent polygonal mirror 18 is aspheric and asymmetrical with respect to an axis of rotation, and opposite surface S2 on the side adjacent photoreceptor drum 26 is also aspheric but symmetrical with respect to an axis of rotation. Lens surface S1 is an anamorphic aspheric surface which is convex toward polygonal mirror 18 in the deflecting plane due to the positivity of the paraaxial radius of curvature R1M but which is concave toward the polygonal mirror 18 in the plane orthogonal to the deflecting plane due to the negativity of the paraaxial radius of curvature R1S. Lens surface S2 is aspheric and convex toward the photoreceptor drum in the deflecting plane but circular and convex toward the photoreceptor drum in the plane orthogonal to the deflecting plane. The f.theta. lens 22 is a scanning lens that has high performance and which yet is easy to design and manufacture.

REFERENCES:
patent: 5128795 (1992-07-01), Endou et al.
patent: 5162938 (1992-11-01), Iima et al.
patent: 5329399 (1994-07-01), Ho

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