Recorders – Electric recording – Electrochemical
Patent
1978-11-24
1980-07-29
Wolfe, John H.
Recorders
Electric recording
Electrochemical
346139C, G03G 15044, G01D 1506
Patent
active
042153557
ABSTRACT:
In accordance with the present invention there is provided an electrographic recording apparatus for recording on an electrostatic charge retentive record medium and a driver circuit suitable for use therein. The apparatus comprises a plurality of recording electrodes mounted in close proximity to the record medium. A plurality of complementary electrodes are mounted in electrical cooperative relationship with the recording electrodes. Improved driver circuits are provided for applying a voltage to the electrodes. The driver comprises a current branch to which the electrode is connected. A current control is provided for supplying a current through the current branch, which current biases diodes to force the electrode to a reference potential. The current further charges an electrical storage element. To apply a high voltage to an electrode, the current control blocks the current flow. The potential stored in the storage element which causes a base-emitter current flow to forward bias the transistor. Forward biasing the transistor connects the electrode to a high voltage supply. When the current control again permits current flow, it causes the transistor to become reverse biased and forward biases the diodes to force the electrode to return to the reference potential.
Another aspect of the present invention is an improved control circuit for the electrodes. The control circuit includes an assembly memory for assembling parts of a line of data, an image memory for controlling recording electrodes and a transfer system for transferring assembled data from the assembly memory to the write memory. Also included is a transfer/assembly control for alternately causing the contemporaneous assembly of one line of data and reading out the preceding line of data to the recording electrodes and causing the transfer of data between the assembly and write memories. Another aspect of the control circuit is an address generating system for addressing the image memory to address words of the stored data to the record electrodes and for actuating appropriate corresponding complementary electrodes.
REFERENCES:
patent: 3611419 (1971-10-01), Blumenthal
patent: 3653065 (1972-03-01), Brown, Jr.
patent: 3662396 (1972-05-01), Brown, Jr.
patent: 3792495 (1974-02-01), Bliss et al.
patent: 4030107 (1977-06-01), Tagawa
patent: 4054885 (1977-10-01), Rothgordt
Baumann Russell E.
Gould Inc.
Kocovsky Thomas E.
Snee, III Charles E.
Wolfe John H.
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