Abstract: The present invention provides a small piezoelectric/electrostrictive ultrasonic linear motors which are installed in cell phones or PDAs, etc. to drive their camera lenses. In the present invention, a movable shaft (30) is coupled to a unimorph or bimorph, which is made by attaching a piezoelectric or electrostrictive substrate to an elastic body (20) (metal), so that a movable body (40) fitted over the movable shaft (30) is linearly moved along the movable shaft (30) by vibration of the piezoelectric or electrostrictive substrate, thus simplifying a manufacturing process, being easily practicable according to a basic principle, and having superior characteristics.
Type:
Grant
Filed:
February 4, 2005
Date of Patent:
March 3, 2009
Assignee:
Piezoelectric Technology Co., Ltd.
Inventors:
Vasiljef Piotr, Bo Keun Kim, Seok Min Yoon, Seong Yil Yoon
Abstract: The present invention provides a small piezoelectric/electrostrictive ultrasonic linear motors which are installed in cell phones or PDAs, etc. to drive their camera lenses. In the present invention, a movable shaft (30) is coupled to a unimorph or bimorph, which is made by attaching a piezoelectric or electrostrictive substrate to an elastic body (20) (metal), so that a movable body (40) fitted over the movable shaft (30) is linearly moved along the movable shaft (30) by vibration of the piezoelectric or electrostrictive substrate, thus simplifying a manufacturing process, being easily practicable according to a basic principle, and having superior characteristics.
Type:
Application
Filed:
February 4, 2005
Publication date:
May 31, 2007
Applicant:
PIEZOELECTRIC TECHNOLOGY CO., LTD.
Inventors:
Vasiljef Piotr, Bo Keun Kim, Seok Min Yoon, Seong Yil Yoon