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IMPROVED ODE CHANNEL PLATE TO IMPROVE PRIMABILITY OF TIJ CHIP AT 45 DEGREE OPERATION

IP.com Disclosure Number: IPCOM000027217D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 107K

Publishing Venue

Xerox Disclosure Journal

Abstract

One embodiment of a scanning head TIJ (Thermal Ink Jet) printer involves the orientation of the nozzles to be 45" off of horizontal. The nozzles fire 45" down. In this orientation air can be trapped in the inside of an orientation depended etching (ODE)

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XEROX DISCLOSURE JOURNAL

IMPROVED ODE CHANNEL PLATE TO IMPROVE PRIMABILITY OF TIJ CHIP AT 45 DEGREE OPERATION

Proposed Classification
U.S. C1.350/331 Int. C1. G02f 1/13

Steven J. Diet1

XEROX DISCLOSURE JOURNAL Vol. 20 No. 5 SeptembedOctober 1995 435

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

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IMPROVED ODE CHANNEL PLATE TO IMPROVE PRIMABILITY OF TIJ CHIP AT 45 DEGREE OPERATION (Cont'd)

One embodiment of a scanning head TIJ (Thermal Ink Jet) printer involves the orientation of the nozzles to be 45" off of horizontal. The nozzles fire 45" down. In this orientation air can be trapped in the inside of an orientation depended etching (ODE) channel plate and this air may be difficult to remove. See Figure 1 for existing channel plate design. As viewed from the top of the heater wafer as shown in Figure 1, an air pocket 2 is in the top of the upper channel plate ink inlet cavity. The balance of the die is filed with ink.

During a typical prime operation, suction is applied to the front face of the TIJ printing head drawing first air and then ink, out through the TIJ orifices. Air can be effectively removed and ink will fill the inside of the ODE channel plate until ink reaches the top nozzle of the print head array. At this time further priming serves to remove only ink from the nozzles and the pocket of air is trapped in the corner formed by the ODE channel plate. This air will reside very close to the entry to the top nozzle which may print initially from a small filament of ink but will "gulp" air from the pocket...