Optical scanning apparatus with a symmetric filter

Details Optical scanning apparatus with a symmetric filter Optical scanning apparatus with a symmetric filter

1995-12-11

1998-01-06

Dzierzynski, Paul M.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359196, 359209, 359217, 359888, 347259, 347261, G02B 2608

Patent

active

057061190

ABSTRACT:
There is provided a filter having a member of absorption material between a convex lens and a polygonal mirror. This member of absorption material is formed by coating a thin metallic film. Due to the foregoing, a predetermined transmission factor distribution can be provided. Accordingly, it is possible to correct an uneven distribution of a quantity of light on the photoreceptor caused by a change in F-number in the overfilled optical system, so that the distribution of a quantity of light can be put into practical use.

REFERENCES:
patent: 3558208 (1971-01-01), Hudson
patent: 4978185 (1990-12-01), Appel
patent: 5331468 (1994-07-01), Noethen
patent: 5539441 (1996-07-01), Appel et al.
patent: 5541779 (1996-07-01), Choi

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