Apparatus for recording and reproducing charge latent image

Details Apparatus for recording and reproducing charge latent image Apparatus for recording and reproducing charge latent image

1989-05-05

1992-03-24

Griffin, Donald A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 43, 358 44, 358471, 358 75, 358909, 365112, H04N 140, H04N 907

Patent

active

050992619

ABSTRACT:
An apparatus for recording an image information on a recording medium comprises means for charging the recording medium in response to a light from the object; means for forming an effective region and a reference region on the recording medium, the effective region representing the image information, the reference region being charged to a reference potential; a sensing head sequentially detecting surface potentials in the effective region and the reference region of the recording medium through electrostatic induction, the sensing head comprising field effect transistor means; a gate input capacitance of the gate means fo the transistor means being charged by a leakage current between the drain means and the gate means of the transistor means; means for subjecting the gate means of the transistor means to a voltage electrostatically induced in correspondence with the surface potentials in the effective region and in the reference region of the recording medium; means for discharging a charge in the gate input capacitance; and means for timely activating said discharging means with a predetermined timing relation to the detection of the surface potential of one of the effective region and the reference region of the recording medium by the sensing head.

REFERENCES:
patent: 3195113 (1965-07-01), Giordano
patent: 3787722 (1974-01-01), Hatsell
patent: 4271417 (1981-06-01), Blumenthal et al.
patent: 4450489 (1984-05-01), Barry et al.
patent: 4727427 (1988-02-01), Kime
patent: 4728971 (1988-03-01), Van Stiphout et al.
patent: 4786971 (1988-11-01), Kaneko et al.

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