The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1989
Filed:
Aug. 10, 1988
Karl H Dreinhoff, Berlin, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A method for fashioning ink channels in a write head for a dot-matrix ink printer means, whereby respective form needles cylindrically surrounded by piezo electric drive elements are aligned in a casting mold in accord with the desired course of the ink channels to be fashioned, are cast out with a casting compound and, after the curing of the latter, are removed upon formation of the respective ink channels partially surrounded by the allocated piezo electric drive elements, and insulation of the drive elements from a writing fluid in the ink channels is acheived in a way that is simple in terms of production engineering. The ink channels are filled with a liquid or dissolved plastic and are emptied after the inside channel walls are moistened with the plastic, so that a thin protective layer remains on the inside channel walls. The new method serves for the manufacture of ink printer heads that work based on the principle of individual drop ejection (drop on demand).