Dynamic focusing apparatus for an optical imaging system using a deformable mirror
First Claim
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1. A scanner for use in reading coded symbologies located at various distances from the scanner, the scanner comprising:
- a distance sensing device for determining a distance between the scanner and a region to scan for said coded symbologies;
means for illuminating said region;
deformable mirror means for focusing light on said region in response to the determined distance; and
means for detecting light reflected from said region.
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Abstract
A focus changing apparatus for an optical scanner which increases the depth of the field of the optical scanner. The focus changing apparatus is optically located between a laser source and a scan mirror and includes a plurality of alternating curved and flat facets. Alternatively, a piezoelectric deformable mirror may be optically located between the laser source and a flat faceted scan mirror to provide for increased depth of field of the optical scanner.
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Citations
6 Claims
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1. A scanner for use in reading coded symbologies located at various distances from the scanner, the scanner comprising:
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a distance sensing device for determining a distance between the scanner and a region to scan for said coded symbologies; means for illuminating said region; deformable mirror means for focusing light on said region in response to the determined distance; and means for detecting light reflected from said region. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification