Holographic scanner disc with different facet areas

Details Holographic scanner disc with different facet areas Holographic scanner disc with different facet areas

1981-06-08

1983-11-15

Arnold, Bruce Y.

G02B 532

Patent

active

044152248

ABSTRACT:
A scan pattern for a bar code scanner is produced by the combination of a coherent light source, a rotating disc with holographic facets and an array of fixed, beam folding mirrors. Light reflected from a bar code label follows a retroreflective path to a photodetector within the scanner. To reduce variations in the amount of light collected through different facets, the areas of the facets are varied as a function of beam elevation and beam path length.

REFERENCES:
patent: 3922059 (1975-11-01), Noguchi
patent: 4094576 (1978-06-01), Heiling

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