Patent ID: 8366951
Filing Date: 2013-02-05
Classification: B41J,Y10T

Abstract:
1. A method of manufacturing a substrate for a liquid discharge head which includes an Si substrate which is provided with a liquid discharge energy generating element, a line provided on a first surface to electrically connect the liquid discharge energy generating element and a semiconductor element for driving the liquid discharge energy generating element, and liquid supply ports which are provided to pass through the Si substrate from the first surface to a rear surface thereof so as to supply a liquid to the liquid discharge energy generating element, the method comprising: forming a plurality of concave portions on the rear surface of the Si substrate of which a plane orientation is {100} so as to be aligned in rows along a <100> direction of the Si substrate, the concave portions facing the first surface so that two concave portions which are closest to each other sandwich a portion of the Si substrate which is present under the line, if an extending direction of the plurality of concave portions from the first surface to the rear surface is assumed downward; and forming a plurality of the liquid supply ports by carrying out a crystal axis anisotropic etching on the Si substrate through the concave portions using an etching liquid of which an etching rate of the {100} plane of the Si substrate is slower than an etching rate of a {110} plane of the Si substrate.