Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1995-08-31
1998-10-06
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347259, B41J 247
Patent
active
058185054
ABSTRACT:
An optical scanning apparatus has a light source, a first optical system for converting luminous flux emitted from the light source to converged luminous flux, a deflector for deflecting the converged luminous flux emitted from the first optical system, and a second optical system for forming an image in a spot shape on the plane to be scanned from luminous flux deflected by the deflector. The second optical system comprises a single lens. Parameters R.sub.1, R.sub.2, Y.sub.max, S.sub.1, S.sub.2, and d of the single lens satisfy the following expressions, with R.sub.1 denoting the paraxial curvature radius of the lens surface facing the deflector in the single lens, R.sub.2 denoting the paraxial curvature radius of the lens surface facing the plane to be scanned in the single lens, Y.sub.max denoting the maximum effective diameter on the main scanning plane of the single lens, S.sub.1 denoting an aspherical-surface amount from the paraxial lens surface of the lens surface facing the deflector at the maximum effective diameter Y.sub.max, S.sub.2 denoting an aspherical-surface amount from the paraxial lens surface of the lens surface facing the plane to be scanned at the maximum effective diameter Y.sub.max, and d denoting the center thickness of the single lens: ##EQU1##
REFERENCES:
patent: 5038156 (1991-08-01), Kuroda
patent: 5111219 (1992-05-01), Makino
patent: 5128795 (1992-07-01), Endou et al.
patent: 5200850 (1993-04-01), Iizuka et al.
patent: 5563729 (1996-10-01), Nakamura et al.
Canon Kabushiki Kaisha
Reinhart Mark J.
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