Laser scanning device with automatic range and spot size adjustment
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United States of America Patent
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Apr 12, 1994
Grant Date -
N/A
app pub date -
Dec 23, 1991
filing date -
Dec 23, 1991
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A laser scanning head in which the range of the beam waist is varied independently of any measurement of the actual range of the symbol. The optical member is a condenser lens that is moved by energizing a magnetic coil; the lens is operated independently of the scanning movement of the laser beam, to produce a continuous, progressive variation (e.g., a continuous oscillation) in the range of the beam waist, so that at some point in the variation the spot size on the symbol will be of an appropriate size. The movement of the lens can be synchronized with the beam scan (e.g., so that the same spot size can be maintained for several scans). Spot size can be chosen adaptively, by varying the range of the beam waist until the contrast in the reflected light collected from the symbol exceeds a predetermined level.
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Cited Art Landscape
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