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Using Saw Cuts to Make Thermal Printheads

IP.com Disclosure Number: IPCOM000040267D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Abbatecola, R: AUTHOR [+3]

Abstract

Tungsten sheets may be cut with precision saws to form wide parallel strips separated by narrow gaps. The strips can then be fabricated into thermal printheads using pattern-etching techniques which are not well suited to providing the narrow gaps. Stacked thin sheets of tungsten 1, clamped with their edges machined square, are positioned vertically in a precision saw 2. Narrow slots 3 are cut in the print element area. The saws 2 are ganged so groups of slots can be cut simultaneously. The stacked tungsten sheets are separated and glued to a polyester sheet 4 (Fig. 2). A photoresist pattern 5 is aligned with the saw-cut tabs 6. This pattern forms a bar across the saw-cut tabs to protect them from the subsequent chemical etching step.

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Using Saw Cuts to Make Thermal Printheads

Tungsten sheets may be cut with precision saws to form wide parallel strips separated by narrow gaps. The strips can then be fabricated into thermal printheads using pattern-etching techniques which are not well suited to providing the narrow gaps. Stacked thin sheets of tungsten 1, clamped with their edges machined square, are positioned vertically in a precision saw 2. Narrow slots 3 are cut in the print element area. The saws 2 are ganged so groups of slots can be cut simultaneously. The stacked tungsten sheets are separated and glued to a polyester sheet 4 (Fig. 2). A photoresist pattern 5 is aligned with the saw-cut tabs 6. This pattern forms a bar across the saw-cut tabs to protect them from the subsequent chemical etching step. The tungsten 1 is chemically etched to form the circuits 7 connecting the saw-cut tabs 6 to the interconnection pads. The above procedure does not have to be carried out in the same order as shown above. For example, the saw cuts could be made after the chemical etching step.

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