Method and apparatus for increasing corona efficiency in an iono

Details Method and apparatus for increasing corona efficiency in an iono Method and apparatus for increasing corona efficiency in an iono

1989-08-10

1991-02-26

Anderson, Bruce C.

Radiant energy

Corona irradiation

Charging of moving object

250326, 346159, H01T 1900

Patent

active

049964259

ABSTRACT:
In an ionographic device projecting a modulated stream of ions in imagewise fashion towards a moving imaging surface, including an ion printing head having an ion chamber supporting a coronode held at a voltage V.sub.C to produce ions for deposit on an imaging surface and a modulation channel extending from the ion chamber towards the imaging surface through which a stream of ions is directed for imagewise modulation by a plurality of modulation electrodes, electric field distribution within the ion chamber is controlled by selectively varying voltages along the surface regions of the ion chamber to different voltage levels, in an arrangement causing focusing of ion density in the area of the ion chamber adjacent to the modulation channel. An increased ion density in the area of the ion chamber adjacent to the modulation channel assists in providing an increased corona current at the output of the device.

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