Ionographic imaging

A method and apparatus which solve the problem of poor density and definition of an image formed by an ion current (20) projected from an ionographic print head (10), caused by electric field crosstalk between adjacent modulation electrodes (22) in the head (10). By applying a partial modulation vol...

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Bibliographic Details
Main Author STEARNS, RICHARD G
Format Patent
LanguageEnglish
French
German
Published 19.01.1994
Edition5
Subjects
CALCULATING
CINEMATOGRAPHY
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HANDLING RECORD CARRIERS
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:A method and apparatus which solve the problem of poor density and definition of an image formed by an ion current (20) projected from an ionographic print head (10), caused by electric field crosstalk between adjacent modulation electrodes (22) in the head (10). By applying a partial modulation voltage (VM') to the adjacent modulation electrodes (22), the density of an individual pixel charge is increased and the pixel charge is "addressed" or deflected to a position on a receptor surface (26) more precisely than the pitch dimension between modulation electrodes (22). A data processor (46) intercepts printing driver commands (44) and constructs therefrom values of partial modulation voltage (VM') by means of an algorithm making deliberate use of the crosstalk phenomenon. The algorithm is pre-defined with respect to image- dependent modulation voltage states and implemented as programmed software or firmware. The partial modulation voltage (VM') is applied to correlated modulation electrodes (22) in response to the printing driver commands (44), by a controller (50) using modified printing commands (48) to produce a corrected image.
Bibliography:Application Number: EP19920306575