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COMPENSATION OF VELOCITY FLUCTUATION FOR BINARY DEFLECTED DROPS

IP.com Disclosure Number: IPCOM000025307D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 78K

Publishing Venue

Xerox Disclosure Journal

Abstract

In continuous stream type ink jet printing devices, fluctuations of ink droplet velocity, either drifting in time or from jet to jet, cause ink droplet misplacement on the recording medium, resulting in print defects and poor copy quality. Through the mutual compensation of the deflection and timing, the droDlet placement errors may be reduced to improve performance of the ink jet printing devices when a substantially binary method of droplet deflection is used.

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XEROX DISCLOSURE JOURNAL

COMPENSATION OF VELOCITY FLUCTU- Proposed ATIOPJ FOR BINARY DEFLECTED DROPS Classification

                                  U.S. C1. 346/75 Ivan Rezanka Int. C1. Gold 15/18

In continuous stream type ink jet printing devices, fluctuations of ink droplet velocity, either drifting in time or from jet to jet, cause ink droplet misplacement on the recording medium, resulting in print defects and poor copy quality. Through the mutual compensation of the deflection and timing, the droDlet placement errors may be reduced to improve performance of the ink jet printing devices when a substantially binary method of droplet deflection is used.

The principle of compensation is shown in the accomoanying figure. A stream 10 of ink droplets is emitted from a nozzle (not shown). The uncharged or neutral droplet trajectory 14 is collected by gutter 12. The normal speed marking droplet trajectory 16 is directed to location ICPl" on the recording medium 20 which moves in the direction of arrow 22. A slow speed marking droplet trajectory 18 is directed to location "P2" on the recording medium. Therefore, the droplet misplacement "h" is the distance between P and P2, which is the distance the recording medium moved during the droplet delay time in reachine the recording medium.

Volume 9 Number 4 July/August 1984 253

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COMPENSATION OF VELOCITY FLUCTUATION FOR BINARY DEFLECTED DROPS (Cont'd)

For the compensation, the marking drop...