Patent Number: 7,819,509

Title: Liquid ejection head and manufacturing method thereof

Abstract: The liquid ejection head includes: a liquid ejection port; a pressure chamber which has a recess part connected to the liquid ejection port; a lower electrode which is arranged on the pressure chamber; a piezoelectric body which has a planar face arranged on the lower electrode; and an upper electrode which is arranged on the piezoelectric body, wherein: a cross section of the recess part of the pressure chamber taken in parallel to the planar face of the piezoelectric body is oblong and has a breadth CWx in a breadthways direction and a length CWy in a lengthwise direction; the piezoelectric body has an active region having a breadth DWx in the breadthways direction of the cross section of the recess part of the pressure chamber and a length DWy in the lengthwise direction of the cross section of the recess part of the pressure chamber.

Inventors: Mita; Tsuyoshi (Kanagawa-ken, JP)

Assignee: Fujifilm Corporation

International Classification: B41J 2/045 (20060101)

Expiration Date: 2018-10-26 0:00:00