Holographic system for generating dual scan patterns

Details Holographic system for generating dual scan patterns Holographic system for generating dual scan patterns

G - Physics

02

B

88/96.8

G02B 27/00 (2006.01)

Patent

CA 1143194

RA978010 HOLOGRAPHIC SYSTEM FOR GENERATING DUAL SCAN PATTERNS Abstract An optical scanner includes a rotating glass disk having an annular track of sectorial holographic diffraction gratings or holofacets. The holofacets deflect an impinging laser beam along arcuate scan lines. The beam which sweeps along these scan lines is redirected by beam folding mirrors to create specific scan patterns focused in predetermined re- gions adjacent a scanner window. Similar or dis- similar scan patterns can be generated depending upon the characteristics of the holofacets and the placement of the beam folding mirrors. The scan patterns can be focussed at different distances from the scanner window to increase the size of the "gate" through which a label must pass in order to be successfully scanned.

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