Picture pick-up device including a solid-state sensor and operat

Details Picture pick-up device including a solid-state sensor and operat Picture pick-up device including a solid-state sensor and operat

1988-01-20

1989-04-25

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821326, 35821323, H04N 315

Patent

active

048252921

ABSTRACT:
A pictue pick-up device includes a solid-state sensor that may be in the form of a frame transfer device (FT) in which smear is present as a signal interference. The sensor (FT) comprises a picture pick-up member (PP) having picture pick-up elements (P) which are sensitive to picture information from a scene to be recorded. A first and a second shift register member (SR1 and SR2) are coupled via first and second storage members (MP1, MP2), respectively to the picture pick-up member (PP). The first and second shift register members (SR1, SR2) have capacitive couplings (FG1, FG2) with first and second outputs (FT1, FT2), respectively of the sensor (FT) for supplying a signal with picture information and smear as interference and for supplying only smear as interference, respectively. The sensor outputs (FT1 and FT2) are connected to respective inputs (AT1 and AT2) of a differential amplifier (A). It is essential that during the performance of the interference reduction the second (FT2) or the first sensor output have a DC connection (FT2, AT2) with an electrically floating potential to a (+) amplifier input (AT2) and that the first (FT1) or the second sensor output have a DC connection to the (-) amplifier input (AT1) and that both sensor outputs (FT1 and FT2) have a capacitive output impedance. As a result an optimum interference reduction at the sensor outputs (FT) is obtained by means of a charge packet comparison.

REFERENCES:
patent: 4104543 (1978-08-01), Maeding
patent: 4490744 (1984-12-01), Levine
patent: 4577115 (1986-03-01), Rentsch et al.
patent: 4731656 (1988-03-01), Dischert et al.
patent: 4731665 (1988-03-01), Hashimoto et al.

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