Communications: electrical – Digital comparator systems
Patent
1978-01-24
1979-12-04
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
250567, 358285, G06K 900
Patent
active
041774493
ABSTRACT:
A photoelectric converter apparatus suited for use in optical pattern reader system comprises a plurality of charge storage type photoelectric conversion elements disposed in a linear array for receiving light reflected from an original such as slip or a bill carrying characters, figures or the like, and storing quantities of electric charges in proportional dependence on the intensity of the reflected light. An additional photoelectric conversion element is also provided for receiving light from a light source illuminating the original and converting the received light into a corresponding electrical signal which is integrated in synchronism with the initiation of the charge storage of the charge storage type photoelectric conversion element assembly. When the integrated signal value has attained a predetermined level, the stored charges are outputted from the charge storage type photoelectric conversion elements. Thus, a stabilized output signal can be obtained even when the luminance of the used light source undergoes variation, because the stored charges are outputted only when the quantity of irradiation light has attained a predetermined reference value. The photoelectric converter apparatus can be implemented in a simple structure.
REFERENCES:
patent: 2943208 (1960-06-01), Shepard et al.
patent: 3379826 (1968-04-01), Gray
patent: 3472958 (1969-10-01), Estock
patent: 3593284 (1971-07-01), Frank et al.
Boudreau Leo H.
Hitachi , Ltd.
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