Laser bar code reader measuring phase of the pulse laser to dete

Details Laser bar code reader measuring phase of the pulse laser to dete Laser bar code reader measuring phase of the pulse laser to dete

1998-01-09

1999-07-13

Lee, Michael G.

Registers

Coded record sensors

Particular sensor structure

235472, 356 51, G07K 710

Patent

active

RE0362514

ABSTRACT:
A laser bar code scanner is disclosed using a pulse laser and phase detector for returned light to determine the distance of a bar code. Also, disclosed the use of several lasers having different focal distances with the determined distance being used to select appropriate laser to increase the working distance of the scanner.

REFERENCES:
patent: 4877949 (1989-10-01), Danielson et al.
patent: 5256864 (1993-10-01), Rando et al.
patent: 5426288 (1995-06-01), Obata et al.

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