Optical scanner for reducing shading

Details Optical scanner for reducing shading Optical scanner for reducing shading

1994-04-11

1995-10-17

Dzierzynski, Paul M.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359212, 359581, 359586, G02B 2608, G02B 110

Patent

active

054596017

ABSTRACT:
In an optical scanner for reducing shading, a semiconductor laser or a semiconductor laser array is set to a light source and a laser beam from the light source is deflected by a light deflector having a deflecting reflecting face and is converged by a lens for scanning as a light spot on a scanned face to perform an optical scanning operation. The optical scanner has an antireflection coating film disposed on only a refractive face for providing a largest change in incident angle in the deflection of the laser beam with respect to faces of optical elements arranged on an optical path from the light deflector to the scanned face to transmit the laser beam through the optical elements. The optical scanner may have an antireflection coating film disposed on one or more lens faces of the scanning lens such that transmittance of the scanning lens is gradually increased from an optical axis thereof toward both end portions in a main scan-corresponding direction.

REFERENCES:
patent: 4325608 (1982-04-01), Kamiya et al.
patent: 4756584 (1988-07-01), Takanashi
patent: 4838631 (1989-06-01), Chande et al.
patent: 5208701 (1993-05-01), Maeda

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