Patent ID: 7540595
Filing Date: 2009-06-02
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a pressure chamber which accommodates liquid to be ejected through an ejection aperture; a diaphragm which constitutes a wall of the pressure chamber; a supply port which is formed as an opening section in a portion of the diaphragm; a supply flow channel which is provided between the supply port and the pressure chamber; and a common liquid chamber which accommodates the liquid to be supplied to the pressure chamber through the supply port and the supply flow channel and is arranged on a side of the diaphragm reverse to a side thereof adjacent to the pressure chamber, wherein the diaphragm has a tongue section, a portion of a perimeter of the tongue section being surrounded by the supply port, the tongue section constituting a portion of a wall of the supply flow channel, a portion of the diaphragm forming the tongue section having a laminated structure of an upper layer on the side adjacent to the common liquid chamber and a lower layer on the side adjacent to the pressure chamber, a coefficient of linear expansion α