Method of and apparatus for generating a beam of light

Details Method of and apparatus for generating a beam of light Method of and apparatus for generating a beam of light

2007-01-09

2007-01-09

Rutledge, D. (Department: 2851)

Photocopying

Projection printing and copying cameras

Step and repeat

C355S067000, C355S071000

Reexamination Certificate

active

10485097

ABSTRACT:
A method and apparatus for generating a beam of light having extended depth of focus. The apparatus comprises, for instance, a binary phase mask that generates a diffraction pattern including a bright main ring and a plurality of side-lobe rings, an annular aperture mask that passing only a portion of the diffraction pattern, and a lens that causes light passing through the annular aperture to converge toward and cross an optical axis. Where the converging light crosses the optical axis, constructive interference takes place, thereby generating a beam of light that has extended depth of focus.

REFERENCES:
patent: 4198571 (1980-04-01), Sheppard
patent: 5530518 (1996-06-01), Ushida et al.
patent: 5552856 (1996-09-01), Shiraishi et al.
patent: 5757470 (1998-05-01), Dewa et al.
patent: 0589103 (1994-03-01), None
patent: 0627643 (1994-12-01), None
patent: 0967524 (1999-12-01), None
patent: 4171415 (1992-06-01), None

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