Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-06-22
1993-07-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
358488, 355311, G01N 2186
Patent
active
052256880
ABSTRACT:
A device for detecting the presence or absence of an original and size thereof and corresponding method therefore. The device is provided on an image forming apparatus, and provides accurate detection of an original and an original's size in the presence of external light. External light is detected during the non-emission state of a light emitting element and used to correct a reference value. The corrected reference value is then compared to a detected value of light emitted from the light emitting element and reflecting from an original, if one is present. Based on the comparison a determination is made as to the presence of an original. When an original is present the light emitting element traverses across the glass contact plate of the image forming apparatus on which the original is placed. Upon the determination of an absence of the original, the light emitting element halts its movement. The distance travelled by the light emitting element is then used to determine the size of the original.
REFERENCES:
patent: 4505574 (1985-03-01), Kurata et al.
patent: 4572650 (1986-02-01), Okuda
patent: 4614874 (1986-09-01), Fukuda et al.
patent: 4713550 (1987-12-01), Anzai et al.
patent: 4778272 (1988-10-01), Asakura
Davenport T.
Mita Industrial Co. Ltd.
Nelms David C.
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