Browse Prior Art Database

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SYSTEM

IP.com Disclosure Number: IPCOM000026232D
Original Publication Date: 1990-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 6 page(s) / 225K

Publishing Venue

Xerox Disclosure Journal

Abstract

The problem of crosstalk between adjacent electrodes in an ionographic print head in an ionographic printing system is known, and in some systems is manifested in a difficulty in producing vertical lines in printed images. For example, U.S. Patent No. 4,794,412 to Casey et al. teaches of just such a phenomenon and indicates a way to reduce the crosstalk effects by adjustment to the strobe and data voltages applied to the ionographic array gates which drive the head. Unfortunately, system latitudes prevent the reduction of the data and strobe voltages to a point which would assure the ability to eliminate crosstalk field effects and the associated problem of printing fine vertical structures. Accordingly, the present invention was developed to compensate for the crosstalk in an ionographic printing device, and in particular to provide consistent output of vertical structure within images created by an ionographic printing device.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

112a 112b 112c 112d

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SYSTEM US. C1.346/154 John A. Frank
Brendan C. Casey
Robert P. Robideau

Proposed Classification

Int. C1. Gold 15/00

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XEROX DISCLOSURE JOURNAL - Vol15 No 6 NovembedDecember 1990 431

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Page 2 of 6

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SY STEM(Cont'd)

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432 XEROX DISCLOSURE JOURNAL - Vol15 No 6 November/December 1990

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Page 3 of 6

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SYSTEM( Cont'd)

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XEROX DISCLOSURE JOURNAL - Vol15 No 6 NovembedDecember 1990 433

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Page 4 of 6

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SYSTEM( Cont'd)

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434 XEROX DISCLOSURE JOURNAL - Vol15 No 6 November/December 1990

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Page 5 of 6

VERTICAL LINE WIDTH CONTROL IONOGRAPHIC SY STEM(Cont'd)

The problem of crosstalk between adjacent electrodes in an ionographic print head in an ionographic printing system is known, and in some systems is manifested in a difficulty in producing vertical lines in printed images. For example, U.S. Patent No. 4,794,412 to Casey et al. teaches of just such a phenomenon and indicates a way to reduce the crosstalk effects by adjustment to the strobe and data voltages applied to the ionographic array gates which drive the head. Unfortunately, system latitudes prevent the reduction of the data and strobe voltages to a point which would assure the ability to eliminate crosstalk field effects and the associated problem of printing fine vertical structures. Accordingly, the present invention was developed to compensate for the crosstalk in an ionographic printing device, and in particular to provide consistent output of vertical structure within images created by an ionographic printing device.

An ionographic printing apparatus, as described by Gundlach et al. in U.S. Patent No. 4,463,363, utilizes modulation electrodes to control the flow of ions from outlet channels of an ionographic print head. Briefly, the present invention is a hardware device for altering the digital data stream that drives each of the modulation electrodes in an ionographic printing device, and in particular, the stretching of strings of similar pixels to widen or enhance the output of fine detail present in the digital input image.

Referring to Figures 1A-lD, which schematically illustrate the relevant portions of an ap...