Using Saw Cuts to Make Thermal Printheads
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
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.