Registers – Coded record sensors – Particular sensor structure
Patent
1991-12-23
1994-04-12
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
235467, 235472, 359824, G06K 710
Patent
active
053028120
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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Dvorkis Paul
Katz Joseph
Li Yajun
Chin Esther H.
Hajec Donald
Symbol Technologies Inc.
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