Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-10-08
1987-12-15
Moses, R. L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
355 14SH, 355 3SH, 355 75, G03G 1500
Patent
active
047135506
ABSTRACT:
A document size detection apparatus having a plurality of sensor portions including light emitting devices and photodetector devices disposed in the vicinity of an original table for detecting the size of a document such as an original mounted on the original table is disclosed. This apparatus uses reflected light or transmitted light, a comparator for comparing the output level of the sensor portion with a reference level, and decision means for deciding the document size depending on the output signal of the comparator. The document size detection apparatus comprises a circuit for changing the reference level of the comparator and for detecting the resultant output of the comparator in order to find the condition in which the reference level becomes equal to the output level of the sensor portion and a storage circuit for storing the value representing that condition, which are used in the adjustment mode without a document mounted on the original table, and a reference level setting circuit for setting the reference level to be input to the comparator depending on the value stored in the storage circuit, which is used in the document size decision mode for detecting the size of a document mounted on the table.
REFERENCES:
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patent: 4456372 (1984-06-01), Yamauchi
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patent: 4614874 (1986-09-01), Fukuda et al.
Anzai Shunju
Kunikawa Norihide
Ohgita Kazuyuki
Sasaki Hiromu
Moses R. L.
Sharp Kabushiki Kaisha
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