Mark reading device with cyclicly varying power

Details Mark reading device with cyclicly varying power Mark reading device with cyclicly varying power

1991-11-12

1992-09-15

Levy, Stuart S.

Registers

Coded record sensors

Particular sensor structure

235472, 250235, 359196, 359217, G06K 710, H01J 314, H01J 516, H01J 4014

Patent

active

051480085

ABSTRACT:
A mark reading device that reads marks such as a bar code, or the like on a remote surface. A laser beam is outputted, deflected through a scan angle and the reflected energy is read at a detector. This energy is processed and converted to a usable format for input into a computer, cash register, or any type of data collection device. The present invention improves depth of field and readability by varying the output energy of the laser after each successive scan, thus providing a range of energy levels at the detector.

REFERENCES:
patent: 4315245 (1982-02-01), Nakahara et al.
patent: 4481667 (1984-11-01), Price et al.
patent: 4677287 (1987-06-01), Ejima
patent: 4820911 (1989-04-01), Arackellian et al.
patent: 4894817 (1990-01-01), Tanaka et al.
patent: 4933538 (1990-06-01), Heiman et al.

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