Wand for a hand-held combined light pen and bar code reader

Details Wand for a hand-held combined light pen and bar code reader Wand for a hand-held combined light pen and bar code reader

1986-10-22

1988-05-31

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

G06K 710

Patent

active

047483180

ABSTRACT:
A unitary hand-held wand incorporates two optical inputs with complete optical and electrical isolation between each of the inputs. In the illustrated embodiment the opto-electrical transducers include a light pen assembly and bar code sensor assembly. Each assembly is included within a housing which is divided into two substantially optically isolated cavities. The light pen assembly is disposed in one cavity and the bar code assembly in the other. The electrical portions of the light pen assembly and bar code assembly are each provided with electrical shields which are electrically isolated from their respective assemblies. The shields are in turn selectively coupled either to the power source ground or chassis ground. The light pen assembly and bar code assembly further include high gain preamplifiers which are additionally electrically shielded by a preamplifier shield. The preamplifier shielding in each case is electrically isolated from the corresponding light pen and bar code assembly electrical shield. A second embodiment includes a single optical input with both a light pen and bar code reader output. Appropriate signal processing circuitry is selectively switched between an amplified output from a single optical detector according to whether a light pen or bar code function is desired.

REFERENCES:
patent: 4682016 (1987-07-01), Inoue

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