Method and apparatus for providing correction of hologon transmi

Details Method and apparatus for providing correction of hologon transmi Method and apparatus for providing correction of hologon transmi

1991-04-01

1992-10-20

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 17, G02B 1532

Patent

active

051575221

ABSTRACT:
A calibration method and apparatus is disclosed that includes a power stabilized laser diode to generate a laser beam that is passed through the hologon scanner to be calibrated and a mechanism for measuring the power intensity of the laser beam at a plurality of positions at an exposure plane for each facet of the hologon scanner. The measured light levels are converted to correction factors that are stored in a corresponding programmable read only memory (PROM) as a function of facet number and scan position. The hologon scanner and its corresponding programmable PROM are then installed in a laser scanning apparatus. The laser scanning apparatus adjusts the output of its light source in accordance with the correction factors stored in the PROM in order to compensate for variations in the light transmission efficiency of the facets of the hologon scanner.

REFERENCES:
patent: 4415224 (1983-11-01), Dickson
patent: 4548463 (1985-10-01), Cato et al.
patent: 4699446 (1987-10-01), Banton et al.
patent: 4751523 (1988-06-01), Froelich

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