Bar code reader

Details Bar code reader Bar code reader

1990-02-27

1991-07-02

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235457, 235467, 235470, G06K 710

Patent

active

050287710

ABSTRACT:
A bar code reader includes a hologram disk having an arcuate circular shaped hologram disk disposed on a disk where the laser beam from a laser beam generator is applied. A laser controller is used for controlling the generating of the laser beam, and included are a signal analyzing unit having pre-amplifiers, a lock-in amplifier, a level shifter, an envelope detector, a waveform shaper, a decoding logic and a signal analyzer, a pair of photodetectors for detecting laser beams from the hologram disk, and a focusing lens, and a mirror member for forming a scanning pattern with a laser beam diffracted by the hologram disk.

REFERENCES:
patent: 4484019 (1984-08-01), Gagnon
patent: 4836649 (1989-06-01), Ledebuhr
patent: 4978202 (1990-12-01), Yang

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