Communications: electrical – Digital comparator systems
Patent
1979-04-11
1981-02-10
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
235455, 250205, 250567, G06K 940
Patent
active
042504880
ABSTRACT:
Patterns on a recording medium are scanned, with reflected light from a light source, and interference factors occurring from fluctuating diffused reflectance of the recording medium and the changing distance of the light source from the scanning field are overcome through the regulation of the light source in response to the light received by the scanner. With a control loop for the light source undesired information in the image signal is eliminated by regulating the illumination intensity. In the scanning device, a sensor converts the light reflected from the scanning field into a plurality of individual analog signals. A sum signal is formed from the individual signals and is provided, delayed, as a measurable variable and is compared with a predetermined reference value in a comparator. The output signal of the comparator controls a regulating unit in the electric circuit of the light source. Inasmuch as the aforementioned interference factors are particularly aggravating when different recording media are scanned and the recording media are not automatically transported during scanning, the device is of particular advantage when employed in manually-guided, hand-held reading devices.
REFERENCES:
patent: 3089123 (1963-05-01), Hennis et al.
patent: 3322893 (1967-05-01), Townsend
patent: 3449585 (1969-06-01), Trehub
patent: 3517167 (1970-06-01), Bell
patent: 3582661 (1971-06-01), Pijls
patent: 3651252 (1972-03-01), Land et al.
patent: 3944979 (1976-03-01), Kwok
patent: 4143358 (1979-03-01), Neff
patent: 4177449 (1979-12-01), Ikeda
Boudreau Leo H.
Computer Gesellschaft Konstanz mbH
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