Patent ID: 7946681
Filing Date: 2011-05-24
Classification: B41J

Abstract:
1. A nozzle plate comprising: a silicon plate substrate; a silicon oxide layer which is formed on the silicon plate substrate, wherein the silicon oxide layer is formed by oxidizing a silicon surface of the silicon plate substrate; a liquid repelling layer which is formed on the silicon oxide layer; a nozzle which is formed through the silicon plate substrate, the silicon oxide layer and the liquid repelling layer, wherein ink is ejected through an ejection port of the nozzle in the liquid repelling layer; and a p-type doped layer which forms a whole perimeter of an edge portion defining an inner perimeter of the ejection port of the nozzle in the liquid repelling layer, and forms a region from the edge portion through a boundary portion between the silicon oxide layer and the liquid repelling layer on an inner surface of the nozzle.