Sensitivity adjustment circuit for bar code scanner and method t

Details Sensitivity adjustment circuit for bar code scanner and method t Sensitivity adjustment circuit for bar code scanner and method t

1993-07-19

1995-04-11

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235463, 235472, 235455, G06K 710

Patent

active

054060621

ABSTRACT:
After serial signals output from a CCD sensor are amplified, a peak value of white levels corresponding to the space portions of bar codes is held by a peak hold circuit, and then the held peak value is converted into a digital value by an analog-to-digital conversion circuit. The value obtained by multiplying accumulation time data from the CCD sensor by the target value of the white level peak value is divided by the digital value. The next accumulation time of the CCD sensor is set on the basis of the result of this division. In this way, the sensitivity of the scanner is adjusted.

REFERENCES:
patent: 4020357 (1977-04-01), Punis
patent: 4373114 (1983-02-01), Herbst
patent: 4528444 (1985-07-01), Hara et al.

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