Ionographic beam positioning and crosstalk correction using grey levels

The Ionographic Beam Positioning And Crosstalk Correction Using Grey Levels is a method and apparatus which solves 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 m...

Full description

Saved in:
Bibliographic Details
Main Author STEARNS; RICHARD G
Format Patent
LanguageEnglish
Published 14.12.1993
Edition5
Subjects
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
CALCULATING
CINEMATOGRAPHY
COMPUTING
CORRECTION OF TYPOGRAPHICAL ERRORS
COUNTING
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HANDLING RECORD CARRIERS
HOLOGRAPHY
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
MAGNETOGRAPHY
MEASURING
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
PHOTOGRAPHY
PHYSICS
PRESENTATION OF DATA
PRINTING
RECOGNITION OF DATA
RECORD CARRIERS
SELECTIVE PRINTING MECHANISMS
STAMPS
TARIFF METERING APPARATUS
TESTING
TRANSPORTING
TYPEWRITERS
Online AccessGet full text

Cover

More Information
Summary:The Ionographic Beam Positioning And Crosstalk Correction Using Grey Levels is a method and apparatus which solves 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 precise 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: US19910720273