Resistive nib ionographic imaging head

Details Resistive nib ionographic imaging head Resistive nib ionographic imaging head

1989-10-25

1990-08-21

Griffin, Donald A.

Recorders

Electric recording

Electrochemical

G01D 1506

Patent

active

049510711

ABSTRACT:
In an ionographic device including an imaging head projecting a modulated stream of ions in imagewise fashion towards a moving imaging surface, wherein the head is provided with an ion chamber supporting a coronode held at a voltage V.sub.C to produce ions for deposit on an imaging surface and an ion chamber exit forming a modulation channel extending from the ion chamber towards the imaging surface through which a stream of ions are directed for imagewise modulation by a plurality of modulation electrodes, electric field distribution through the modulation channel is controlled by forming the modulation electrodes with resistive material. When a individual resistive material nib is turned on, a voltage difference is applied across the electrode in the ion flow direction, to shape the electric field through the modulation channel so that it is closely parallel to the surface of the electrode. Ions thus tend to flow in the direction of the electric field, though the modulation channel. The invention has application to both fluid jet assisted devices and non-fluid jet assisted devices.

REFERENCES:
patent: 4430661 (1984-02-01), Tarumi et al.
patent: 4463363 (1984-07-01), Gundlach et al.
patent: 4524371 (1985-06-01), Sheridon et al.
patent: 4538163 (1985-08-01), Sheridon
patent: 4593994 (1986-06-01), Tamura et al.
patent: 4644373 (1987-02-01), Sheridan et al.
patent: 4737805 (1988-04-01), Weisfield et al.
patent: 4763141 (1988-08-01), Gundlach et al.

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