The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2011
Filed:
Jul. 03, 2008
Kaoru Matsuki, Kawasaki, JP;
Kaoru Matsuki, Kawasaki, JP;
Olympus Corporation, Tokyo, JP;
Abstract
To provide a position control method for a shape memory alloy actuator that improves positioning accuracy of the actuator while ensuring satisfactory response until achieving positioning, the method includes a commanded resistance value setting step of setting a commanded resistance value that corresponds to the predetermined length, a resistance value measurement step of measuring the value of resistance, a resistance value comparison step of comparing the commanded resistance value and the measured resistance value, a first control step of controlling the length of the shape memory alloy using a first gain based on the result of comparison until the commanded resistance value is reached, a termination determination step of making a determination as to a condition for terminating the first control step, and a second control step of keeping the moving body stationary, upon determination of termination in the termination determination step, by retaining the length of the shape memory alloy using a second gain smaller than the first gain based on the result of the comparison, wherein the second control step is continued until a commanded resistance value is set again, thereby performing position control of the moving body.