Registers – Coded record sensors – Particular sensor structure
Patent
1993-11-24
1995-01-17
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235472, G06K 710
Patent
active
053827821
ABSTRACT:
A circuit for adjusting the sensitivity of an optical character reader in which light is applied to an information-recorded material by an LED array and the information is read by a line sensor. The optical character reader is switched to a sensitivity adjusting mode. It reads a reference material having uniform reflectivity on the surface. The read signal is A/D converted and the microcomputer 10 detects a discrepancy between the amounts of light depending on the different portions of the line sensor. Based upon the detection, the microcomputer sets the applying time of driving currents to the respective LEDs so that the light is uniformly applied to the reference material. The set value is stored in a memory. Thereafter, since the amounts of light from the LEDs of the LED array are adjusted according to the set value, the amount of the reflected light to the line sensor 5 can be uniform. Thus, a series analog voltage accurately responding to the darkness and brightness of the information can be obtained.
REFERENCES:
patent: 4528444 (1985-07-01), Hara et al.
patent: 5281801 (1994-01-01), Shepard et al.
Hasegawa Kazuo
Ouchi Junichi
Alps Electric Co. ,Ltd.
Bever Patrick T.
Pitts Harold
Shoup Guy W.
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