Construction for transmitting displacement of piezoelectric element

A structure for transmitting the displacement of a piezoelectric element which is constructed in such a manner as to transmit to a mating member a displacement generated in a stacked piezoelectric element when said stacked piezoelectric element is energized to be driven, said structure for transmitting the displacement of a piezoelectric element comprising:

• a piston member which is in direct contact with said piezoelectric element and is disposed at one end face of said piezoelectric element in a displacement direction thereof, and
• a distal-end plate portion which has a receiving face in direct contact with a distal-end face of said piston member in the displacement direction of said piezoelectric element and which is adapted to be brought into direct contact with a mating member to be driven at a displacement transmitting face thereof which is situated on an opposite side to said receiving face;
• wherein both end faces of said piezoelectric element in the displacement direction thereof are maintained substantially in parallel with each other;
• wherein an in-line annular contact configuration exists between said distal-end face of said piston member and said receiving face of said distal-end plate portion;
• and
• wherein said piezoelectric element, said piston member and said distal-end plate portion are constructed to include only one annular contact interface and to be substantially stationary relative to directions except for the displacement direction of said piezoelectric element.