| 摘要 |
The present invention relates to a reading unit and a marking card for optic al mark reader. The reading unit comprises a plurality of optical sensing devic es (R1, R2, R3, R4 ...) corresponding to a plurality of marks (M1, M2, M3, M4 ...); and a plurality of counters (CT1, CT2, CT3, CT4 ...) for converting output signals to output values corresponding to an amount of light sensed, and for sending the output value s to a central processing unit (CPU). The CPU performs an answer checking process b y a logical calculation based on the output values from the counters (CT1, CT2, CT3, CT4 ...).
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