Displacement magnifying mechanism, polishing device, actuator, dispenser, and air valve

A polishing device, comprising:

• a displacement magnifying portion comprising
• a base portion serving as a substrate;
• a first attachment portion and a second attachment portion which are provided on a surface on one side of the base portion;
• a first piezoelectric element and a second piezoelectric element of which one ends are connected to the first attachment portion and the second attachment portion respectively;
• an operating portion which is connected to the other ends of the first piezoelectric element and the second piezoelectric element and generates a displacement due to expansion and contraction of the piezoelectric elements;
• a link portion which is disposed between the first piezoelectric element and the second piezoelectric element, links the operating portion and the base portion, and applies pressure to the first piezoelectric element and the second piezoelectric element;
• and
• a polishing portion which is provided on a surface of the operating portion opposite to a surface in contact with the first piezoelectric element and the second piezoelectric element,
• wherein the operating portion is disposed so that a distance from an upper portion of the base portion to the operating portion is longer than a distance between the first attachment portion and the second attachment portion,
• wherein the first piezoelectric element is configured to generate an expansion displacement in case where the second piezoelectric element is configured to generate a contraction displacement, and
• wherein the first piezoelectric element and the second piezoelectric element are configured to such that the extension line of axis in expansion and contraction directions of the first piezoelectric element intersects an extension line of axis in expansion and contraction directions of the second piezoelectric element on an extension line of axis of the link portion.

An actuator, comprising:

• a base portion serving as a substrate;
• a first attachment portion and a second attachment portion which are attached to a surface on one side of the base portion;
• a first piezoelectric element and a second piezoelectric element of which one ends are connected to tip portions of the first attachment portion and the second attachment portion, respectively;
• an operating portion which is connected to the other ends of the first piezoelectric element and the second piezoelectric element and generates a displacement due to expansion and contraction of the piezoelectric elements;
• a link portion which is disposed between the first piezoelectric element and the second piezoelectric element, links the operating portion and the base portion, and applies pressure to the first piezoelectric element and the second piezoelectric element;
• and
• a drive portion which supplies a voltage or a current to the first piezoelectric element and the second piezoelectric element and drives the first piezoelectric element and the second piezoelectric element to expand and contract,
• wherein the operating portion is disposed so that a distance from an upper portion of the base portion to the operating portion is longer than a distance between the first attachment portion and the second attachment portion,
• wherein the first piezoelectric element is configured to generate an expansion displacement in case where the second piezoelectric element is configured to generate a contraction, and
• wherein the first piezoelectric element and the second piezoelectric element are configured to such that the extension line of axis in expansion and contraction directions of the first piezoelectric element intersects an extension line of axis in expansion and contraction directions of the second piezoelectric element on an extension line of axis of the link portion.