Recorders – Electric recording – Electrochemical
Patent
1978-07-31
1981-04-14
Hecker, Stuart N.
Recorders
Electric recording
Electrochemical
346154, G03G 15044
Patent
active
042622948
ABSTRACT:
A sheet of copy paper (24) is moved perpendicular to a linear array (22) of printing electrodes (221, 222, 223, 224 . . . ). The electrodes (221, 222, 223, 224 . . . ) are selectively energized to form an electrostatic charge pattern on the copy sheet (24) corresponding to one horizontal scan line of an original document. The electrostatic charge pattern is developed by a toner and the resulting toner image fixed to the copy sheet (24). The electrodes (221, 222, 223, 224 . . . ) are divided into a first set (221, 223, 225 . . . ) and a second set (222, 224, 226 . . . ), the electrodes in the second set (222, 224, 226 . . . ) being alternatingly spaced from the electrodes in the first set (221, 223, 225 . . . ) along the length of the array (22). The first set (221, 223, 225 . . . ) of electrodes are selectively energized during a first time period (t1) and the second set (222, 224, 226 . . . ) of electrodes are selectively energized during a subsequent second time period (t2). The second time period (t2) may be made longer than the first time period (t1) and/or a voltage (V2) applied to the second set (222, 224, 226 . . . ) of electrodes may be made higher than a voltage (V1) applied to the first set (221, 223, 225 . . . ) of electrodes.
REFERENCES:
patent: 2997361 (1961-08-01), Christopherson
patent: 3157456 (1964-11-01), Kikuchi
patent: 3624661 (1971-11-01), Shebanow
patent: 3653065 (1972-03-01), Brown, Jr.
patent: 3797021 (1974-03-01), Hida
patent: 3798609 (1974-03-01), Frohbach
patent: 4157553 (1979-06-01), Diddens
Furukawa Noboru
Hara Kazuyuki
Kamada Takeshi
Kondo Mitsuru
Ohori Tamio
Alexander David G.
Hecker Stuart N.
Ricoh & Company, Ltd.
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