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A PROCESS FOR LAMINATION OF NICKEL SCREEN TO THE BONDED CHANNEL WAFER IN PRINTHEAD MANUFACTURE

IP.com Disclosure Number: IPCOM000027316D
Original Publication Date: 1996-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 174K

Publishing Venue

Xerox Disclosure Journal

Abstract

During the assembly of thermal ink jet devices, a nickel screen is placed on top of the channel wafer after it has been bonded to the heater wafer and before individual dies are diced from the laminate. The individual dies are then bonded to the ink reservoir and the addressing electronics in order to obtain fully functional printheads. The primary reason for the presence of nickel screen in this case is to prevent the flow of debris in the ink from the ink reservoir to the channels. Were that to happen, the channels would, in all likelihood, get blocked, and would, as a result, not be able to deliver ink to the paper. This would lead to a loss in print quality. By the same token, any kinks in the very fine nickel screen would also lead to a similar loss in print quality. However, in this latter case the reason would be the lack of flow of the ink from the reservoir to the channels rather than the blockage of the channels by the debris in the ink as in the previous case. Thus, a mechanical and operator independent process for the lamination of the nickel screen to the channel plate, after the latter has been bonded to the heater plate, is required so that a smooth and kink free lamination is achieved every time.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

A PROCESS FOR LAMINATION OF NICKEL SCREEN TO THE BONDED CHANNEL WAFER IN PRINTHEAD MANUFACTURE
Ram S. Narang
Stephen F. Pond
Robert P. Altavela
Fredrick A. Warner

Proposed Classification

US. C1.346/140 Int. C1. Gold 15/16

12

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 21, No. 2 MarcWApril 1996 113

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

Page 2 of 4

A PROCESS FOR LAMINATION OF NICKEL SCREEN TO THE BONDED CHANNEL WAFER IN PRINTHEAD MANUFACTURE (Cont'd)

13 24

c--

1

10

FIG. 2

114 XEROX DISCLOSURE JOURNAL - Vol. 21, No. 2 MarcMApril 1996

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

Page 3 of 4

A PROCESS FOR LAMINATION OF NICKEL SCREEN TO THE BONDED CHANNEL WAFER IN PRINTHEAD MANUFACTURE (Cont'd)

During the assembly of thermal ink jet devices, a nickel screen is placed on top of the channel wafer after it has been bonded to the heater wafer and before individual dies are diced from the laminate. The individual dies are then bonded to the ink reservoir and the addressing electronics in order to obtain fully functional printheads. The primary reason for the presence of nickel screen in this case is to prevent the flow of debris in the ink from the ink reservoir to the channels. Were that to happen, the channels would, in all likelihood, get blocked, and would, as a result, not be able to deliver ink to the paper. This would lead to a loss in print quality. By the same token, any kinks in the very fine nickel screen would also lead to a similar loss in print quality. However, in this latter case the reason would be the lack of flow of the ink from the reservoir to the channels rather than the blockage of the channels by the debris in the ink as in the previous case. Thus, a mechanical and operator independent process for the lamination of the nickel screen to the channel plate, after the latter has been bonded to the heater plate, is required so that a smooth and kink free lamination is achieved every time.

One technique for the lamination of the nickel screen to the channel plate is provided by the assembly shown in FIG. 1. A mechanical laminator assembly 8 consists of a vacuum wafer retaining platen 10 with a groove to hold the bonded channel and the heater wafer 13 through the application of a vacuum. The second component of the laminator assembly is an aluminum roller 12.
Roller 12 is covered with a 118 inch thick neoprene rubber in order to provide a soft support for the delicate nickel screen 14. Another special feature of this roller is a cut-out 16 for two flat magnets which will be placed in the roller in such a way that the exposed surface of the second magnet is flush with the rest of the roller surface. Initially the top magnet would be lifted...