Optical: systems and elements – Lens – High distortion lens
Patent
1994-07-27
1997-07-15
Epps, Georgia Y.
Optical: systems and elements
Lens
High distortion lens
359206, G02B 300, G02B 2608
Patent
active
056488750
ABSTRACT:
A novel optical scanning system which is cheap to manufacture, which exhibits an excellent f.sub..theta. characteristic and which satisfactorily corrects curvature of field in a sub scanning parallel direction. The optical scanning system is formed by two or more lenses. One of the two or more lenses is a corrector lens which corrects curvature of field in the sub scanning parallel direction. The corrector lens is made of plastic so as to have a substantive power only in the sub scanning parallel direction. The corrector lens is smoothly curved along its longitudinal direction into a shape which corrects curvature of field in the sub scanning parallel direction. The cross-sectional configuration of the corrector lens taken in a plane which is parallel to a central optical axis and perpendicular to a main scanning parallel direction is approximately constant along the longitudinal direction of the corrector lens.
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patent: 4786151 (1988-11-01), Hamada
patent: 5179465 (1993-01-01), Kondo
patent: 5189546 (1993-02-01), Iizuka
patent: 5196957 (1993-03-01), Brueggemann
patent: 5200850 (1993-04-01), Iizuka
patent: 5220450 (1993-06-01), Iizuka
patent: 5255113 (1993-10-01), Yoshikawa
patent: 5329399 (1994-07-01), Ho
patent: 5442477 (1995-08-01), Iima
Epps Georgia Y.
Mack Ricky
Sankyo Seiki Mfg. Co. Ltd.
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