Patent ID: 7797804
Filing Date: 2010-09-21
Classification: H01L,Y10T

Abstract:
1. A method of manufacturing a multilayered piezoelectric element, said method comprising the steps of: (a) forming a multilayered structure including plural piezoelectric material layers, at least one first electrode layer, and at least one second electrode layer, said at least one first electrode layer and said at least one second electrode layer alternately stacked with respective one of said plural piezoelectric material layers in between; (b) coating a liquid synthetic resin on an end portion of said at least one first electrode layer in a first region within side surfaces of said multilayered structure by using a liquid feed mechanism, and curing the liquid synthetic resin to form at least one first insulating film; (c) coating a liquid synthetic resin on an end portion of said at least one second electrode layer in a second region different from the first region within the side surfaces of said multilayered structure by using the liquid feed mechanism, and curing the liquid synthetic resin to form at least one second insulating film; (d) forming a first side electrode in said first region such that said first side electrode is connected to the end portion of said at least one second electrode layer, and passed through a surface of said at least one first insulating film so as to be insulated from said at least one first electrode layer; (e) forming a second side electrode in said second region such that said second side electrode is connected to the end portion of said at least one first electrode layer, and passed through a surface of said at least one second insulating film so as to be insulated from said at least one second electrode layer; and (f) performing poling treatment on said plural piezoelectric material layers by applying a voltage equal to n·E wherein each of steps (b) and (c) includes forming respective one of said first and second insulating films such that each of a shortest distance from the end portion of said first electrode layer to a surface of said first insulating film and a shortest distance from the end portion of said second electrode layer to a surface of said second insulating film becomes larger than n·E