Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-03-18
1993-10-19
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359211, 346108, G02B 2608
Patent
active
052551156
ABSTRACT:
There is disclosed an optical scanning system in which axis alignment in a subscanning direction and adjustment of a spot is easily performed, the spot diameter is variable and a change in efficiency of an optical path due to these changes is small. The optical scanning system comprises two flat plate glasses which are provided between a cylindrical lens for converging an optical beam in a subscanning direction and a polygon mirror and are rotatable around an axis perpendicular to the subscanning direction and may be fixed after an adjustment. Axis alignment in a subscanning direction is obtainable by adjustment of the angle of one flat plate glass, and change in the spot diameter is obtainable by rotating two flat plate glasses in opposite directions while change of the axis in the subscanning direction and change in efficiency of the optical path are kept small.
REFERENCES:
patent: 3511551 (1970-05-01), Matulka
patent: 3617106 (1971-11-01), Bjork
patent: 3871750 (1975-03-01), Mecklenborg
patent: 4319807 (1982-03-01), Horton
patent: 4768184 (1988-08-01), Reno
patent: 4850686 (1989-07-01), Morimoto et al.
patent: 4900120 (1990-02-01), Caviglia et al.
Ben Loha
Hitachi , Ltd.
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