US Patent 7654651 Liquid discharge head and manufacturing method of the same

In a liquid discharge head having a vibration plate provided with piezoelectric driving sections and a substrate which supports the vibration plate and in which pressure generating chambers communicating with discharge ports to discharge a liquid are arranged to correspond to the piezoelectric driving sections, at a region of an end portion of each pressure generating chamber in a longitudinal direction, a portion of the substrate on a side of the vibration plate protrudes along the longitudinal direction to the pressure generating chamber in a stepped state.