Optical device for generating pattern having uniform light inten

Details Optical device for generating pattern having uniform light inten Optical device for generating pattern having uniform light inten

1990-03-29

1992-07-28

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

2503361, 7386141, 372 21, 372 69, H04N 121

Patent

active

051344262

ABSTRACT:
An optical device for illuminating an object with a rectangular pattern having a uniform light intensity distribution includes n (n.gtoreq.1) polarization separating elements which a laser beam emitted from a laser source enters and each of which separates the laser beam into two beams in two directions. The angle of separation by the polarization separating element is set to be 2.sup.(n-1) times of the smallest one of the separation angles of the polarization separating elements used. At least one quarter-wave or half-wave plate is combined with the polarization separating elements. An imaging lens is provided for forming 2.sup.n beam spots on the object such as an optical laser disk plate.

REFERENCES:
patent: 4413342 (1983-11-01), Cohen et al.

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