Means to achieve a square intensity profile at an image plane by

Details Means to achieve a square intensity profile at an image plane by Means to achieve a square intensity profile at an image plane by

1994-05-02

1995-12-26

Powell, Mark R.

Optical: systems and elements

Prism

With reflecting surface

359216, 359196, G02B 2608

Patent

active

054795834

ABSTRACT:
An optical system is disclosed which utilizes a pair of binary diffraction optic lenses to reprofile the intensity and the amplitude distribution profiles of a light beam prior to a rotating polygon mirror to profiles in the shapes of a sinc squared function and sinc function in order to generate a square pixel profile both in the intensity and amplitude at the photoreceptor plane. Both binary diffraction optic lenses have a plurality of segments. Each segment of the first binary diffraction optic lens either diverges, converges or passes through without a change, a portion of the light beam. The second binary diffraction optic lens, which is located down stream of the first binary diffraction optic lens, has an equal number of segments as the first binary diffraction optic: lens. Each segment of the second binary diffraction optic lens receives the light beam from a respective segment of the first binary diffraction optic lens and collimates the light beam. Some segments of the second binary diffraction optic lens change the optical phase of the portion of the light beam which passes through those segments.

REFERENCES:
patent: 5136424 (1992-08-01), Cox et al.
patent: 5261904 (1993-11-01), Baker et al.
patent: 5289564 (1994-02-01), Morimoto et al.
patent: 5309272 (1994-05-01), Harris
patent: 5315427 (1994-05-01), Rauch et al.
patent: 5331468 (1994-07-01), Noethen
patent: 5367400 (1994-11-01), Harris et al.

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