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CHARGE TUNNEL ASSEMBLY FOR TYPE 1 INK JET PRINT HEADS

IP.com Disclosure Number: IPCOM000025170D
Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 113K

Publishing Venue

Xerox Disclosure Journal

Abstract

Because the electrical coupling between charge tunnel and drop stream is not sensitive to stream alignment, the position and technique of mounting the charge tunnels have not been a critical concern in printhead design. However, there is a strong functional link between charging and deflection so that charge tunnels have been typically associated with deflection plates. In many printhead configurations, the charge tunnels have shared a support common to that for the deflection plate assembly. This arrangement limits the flexibility of independently aligning the charge tunnels and deflection plates to the drop streams. The charge tunnel design 10 shown in Figure 1 attaches the charging electrodes 14 to the drop generator body via the aperture retainer plate 20, linking the charging process to drop generation. This assures accurate, independent alignment to the streams and drop breakoff point.

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(EROX DISCLOSURE JOURNAL

CHARGE TUNNEL ASSEMBLY FOR TYPE 1 INK JET PRINT HEADS Gilbert M. Elchinger

Proposed Classification US. Cl. 346/75
Int. Cl. Gold 15/18

Volume 8 Number 6 November/December 1983 487

[This page contains 1 picture or other non-text object]

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I

CHARGE TUNNEL ASSEMBLY FOR TYPE 1 INK JET PRINT HEADS (Cont'd)

Because the electrical coupling between charge tunnel and drop stream is not sensitive to stream alignment, the position and technique of mounting the charge tunnels have not been a critical concern in printhead design. However, there is a strong functional link between charging and deflection so that charge tunnels have been typically associated with deflection plates. In many printhead configurations, the charge tunnels have shared a support common to that for the deflection plate assembly. This arrangement limits the flexibility of independently aligning the charge tunnels and deflection plates to the drop streams. The charge tunnel design 10 shown in Figure 1 attaches the charging electrodes 14 to the drop generator body via the aperture retainer plate 20, linking the charging process to drop generation. This assures accurate, independent alignment to the streams and drop breakoff point.

In Figure 1, tubular charge tunnels 12 are formed by metal coating holes 14 formed in a rigid, insulating, nonwettable support block 16 to form tunnel plate 22. Printed extension leads 18 can be added to facilitate electrical connections. The thickness of the support block 16 is determined by the charge tunnel lengths. A rigid, insulating nonwettable aperture retainer plate 20 is designed to receive the charge tunnel plate 22 in one unique position, or alignment, by use of locating pins and holes 24, 24a. Support bars 26 are provided to enhance...