| 摘要 |
<p>Holographic scanning system for scanning a bar code in which the scan pattern includes at least two non-parallel scan lines. In a first embodiment, the light beam (72) of a laser (70) is split into two segments (75, 76), each directed through a plurality of holograms (88) mounted on a single rotating disk (86) for generating a scanning pattern (90) comprising a plurality of intersecting lines on a target area through which passes a label (32) or object bearing a bar code. The light reflected from the bar code is picked up by an optical detector (98) for use in reading the bar code. A second embodiment includes a rotating disk (110) having mounted thereon two semicircular holograms (110, 112) arranged to generate a pattern including two semicircular arcs (116, 118) used in generating a star or multiple X scan pattern on the target area. </p> |
