Piezoelectric fan and air cooling apparatus using the piezoelectric fan

摘要

A piezoelectric fan includes a vibration plate one end of which in a length direction is supported in a fixed manner and the other end of which in the length direction is a free end; and piezoelectric elements, attached on at least one of front and back surfaces of the vibration plate. In an intermediate portion of the vibration plate in the length direction, a right-angle bent portion is provided, and a plurality of divided blades are defined by slits in an area of the vibration plate extending from the free end to a position located a predetermined distance from the bent portion toward the free end. The piezoelectric element is attached on the portion of the vibration plate between the fixed end and the bent portion. Hence, variations in resonant frequency among the blades are reduced and the blades are efficiently excited using a common piezoelectric element.

主权项

1. A piezoelectric fan comprising:
a vibration plate one end of which in a length direction is supported in a fixed manner and the other end of which in the length direction is a free end; and a piezoelectric element attached on at least one of front and back surfaces of the vibration plate; wherein an air stream is generated by vibration of the vibration plate in a thickness direction thereof when the piezoelectric element is driven; a right-angle bent portion is provided in an intermediate portion of the vibration plate in the length direction thereof; a plurality of divided blades are defined by slits in an area of the vibration plate extending from the free end towards the bent portion and ending before reaching the bent portion, wherein the plurality of divided blades extend in a same direction from a position located between the bent portion and the free end toward the free end; and the piezoelectric element is attached on the portion of the vibration plate between the fixed end and the bent portion, and the piezoelectric element is spaced away from the bent portion.