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    • 64. 发明授权
    • Bar code reading apparatus
    • 条形码阅读器
    • US5077463A
    • 1991-12-31
    • US487326
    • 1990-03-02
    • Shinichi Sato
    • Shinichi Sato
    • G06K7/00G06K7/016G06K7/10G06K7/14
    • G06K7/1486G06K7/0166G06K7/14
    • A bar code reading apparatus includes a scanner, and a measuring circuit for measuring a width of each white bar contained in the bar code and a width of each black bar contained therein and for outputting a measurement signal indicative of the width of the each white or black bar. Further, the apparatus includes first, second and third detection circuits. The first detection circuit detects, from the measurement signal, a white bar having a width equal to or greater than a first reference value and outputs a first detection signal indicative of the width of the white bar. The second detection circuit detects, from the measurement signal, a white bar having a width equal to or greater than a second reference value and outputs a second detection signal indicative of the width of the white bar, the second reference being less than the first reference. The third detection circuit detects, from the measurement signal, a black bar having a width equal or greater than a third reference value and outputs a third detection signal indicative of the width of the black bar. A logic circuit receives the first, second and third detection signals and outputs a margin detection signal indicating detection of the margin area on the basis of the first, second and third detection signals.