Photocopying – Including fiber optics
Patent
1985-12-20
1987-09-22
Prescott, A. C.
Photocopying
Including fiber optics
355 3R, 355 14R, 355 14E, 355 14SH, G03G 1500
Patent
active
046951547
ABSTRACT:
A document scanning unit obtains image data by optically scanning the document. In an initial state, a first control unit sets the document scanning unit at a predetermined position, and sets a light emitting and receiving unit at a predetermined position. A second control unit causes the document scanning unit to move from the predetermined initial position in accordance with an instruction from a document size detection instruction unit prior to the image formation instruction. A first detection unit detects, as a change in amount of light received by the light receiving section, that the light emitting and receiving unit has reached one side portion of the document. A third control unit causes the light emitting and receiving unit to move from the predetermined initial position in accordance with a detection signal from the first detection unit. A second detection unit detects, as a change in amount of light received by the light receiving section, that the light emitting and receiving unit has reached the other side portion of the document. A document size calculating unit calculates two dimensions of the document based on the detection signals from the first and second detection units.
REFERENCES:
patent: 3926518 (1975-12-01), Berry et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4338020 (1982-07-01), Yukawa et al.
patent: 4354758 (1982-10-01), Futaki
patent: 4472046 (1984-09-01), Kohyama
Kabushiki Kaisha Toshiba
Prescott A. C.
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