Reading unit and marking card for optical mark reader

Details Reading unit and marking card for optical mark reader Reading unit and marking card for optical mark reader

2006-10-24

2006-10-24

Le, Uyen-Chau N. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S456000, C235S462190

Reexamination Certificate

active

07124945

ABSTRACT:
The present invention relates to a reading unit and a marking card for optical mark reader.The reading unit comprises a plurality of optical sensing devices (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 values to a central processing unit (CPU).The CPU performs an answer checking process by a logical calculation based on the output values from the counters (CT1, CT2, CT3, CT4. . . ).

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