Reading unit and marking card for optical mark reader
AssigneeEasy Test Co., Ltd.
InventorTaek-Jin Kim
Life of this patent
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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 . . . ).
Claims2
A reading unit for an optical mark reader, the reading unit comprising:
- an optical sensing device for sensing the light which is transmitted through or reflected from an answering mark, the answering mark divided into a plurality of predefined areas;
- a counter for counting a number of times that a marked area of the divided answering mark is sensed, based on an output signal from the optical sensing device;
- and
- a CPU for determining a size of the marked area based on the number counted by the counter and in accordance with the predefined areas, and checks a correct answer based on a determined size.
Dependencies are inferred from the claim text.