Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-01-20
1985-02-19
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358167, 358212, 358284, 358294, 357 24, H04N 110, H04N 521, H04N 140, H04N 102
Patent
active
045009279
ABSTRACT:
An original reading device comprising a plurality of light sensing elements connected to output signal lines via MOS transistors. A row of light sensing elements is divided into blocks of elements. Each block has a pair of signal output lines. Groups of consecutive MOS transistors are alternately connected to the two signal lines, each group comprising at least two MOS transistors. The transistors are turned on twice each reading cycle, the time between turn-on of a given MOS being sufficiently short so that the output signal contains only noise, as compared to the photosignal plus noise obtained during the first turn-on. The turn-on sequence is such that the first turn-on of any group coincides with the second turn-on of the preceeding group. The signal output lines are connected as the inputs of a differential amplifier. Thus the noise signals are subtracted from the photosignal plus noise signals to result in outputs having only photosignals.
REFERENCES:
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4109284 (1978-08-01), Tompkins
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4335405 (1982-06-01), Sakane et al.
patent: 4419696 (1983-12-01), Hamano et al.
patent: 4424590 (1984-01-01), Ozawa
patent: 4449147 (1984-05-01), Ogasawara
Britton Howard W.
Fuji 'Xerox Co., Ltd.
Peng John K.
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