Patent ID: 9184368
Filing Date: 2015-11-10
Classification: B06B,H01L

Abstract:
1. A film-type piezoelectric/electrostrictive element which is a fired object comprising: a body part having n+1 layered piezoelectric/electrostrictive films and n layered internal electrode layer(s), the piezoelectric/electrostrictive films composed of ceramic, the piezoelectric/electrostrictive films and the internal electrode layer(s) stacked in an alternating manner, the n being an integer equal to 1 or more; a pair of side-surface electrodes positioned on two opposing side surfaces of the body part, the two opposing side surfaces extending in a stacking direction of the body part; the internal electrode layer(s) exposed on an electrode exposed surface of the body part, the electrode exposed surface extending in the stacking direction; and an electrode exposure ratio of the internal electrode layer(s) on the electrode exposed surface as defined by Formula (1) being more than 0% and less than or equal to 10%, wherein A1 denotes an exposed area of the internal electrode layer(s) exposed on an active portion of the electrode exposed surface, L1 denotes an average thickness of the internal electrode layer(s), L2 denotes a sum length of each of the internal electrode layer(s) in a lengthwise direction on the active portion of the electrode exposed surface, and the lengthwise direction is perpendicular to the stacking direction.