Registers – Coded record sensors – Particular sensor structure
Patent
1990-11-20
1993-05-18
LaRoche, Eugene R.
Registers
Coded record sensors
Particular sensor structure
235467, 235470, G06K 710
Patent
active
052123707
ABSTRACT:
The useful life of a laser, such as a laser diode, is extended by causing the laser to operate only intermittently when continuous operation is not required. When such a laser diode is used in a scanner for scanning coded symbols, such as bar codes, in merchandise check-out operations, continuous operation is required only when a coded symbol is present in a target area. A sensing device is provided for sensing the transitions in light reflected back from the target area, and a counter is provided for counting the number of such transitions. Since a much larger number of transitions are sensed and counted when a coded symbol is being read than when no such symbol is present in the target area, this difference in number of transitions is used to distinguish between the two conditions and to cause the laser diode to be turned on for continuous operation only when a coded symbol is present in the target area to be read.
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Blanford Denis M.
Burkey John K.
Detwiler Paul O.
Hilles Wilbur I.
Mergenthaler Barry M.
Glembocki Christopher R.
LaRoche Eugene R.
NCR Corporation
Sessler Jr. Albert L.
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