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:
Mar. 08, 2011
Filed:
Feb. 28, 2008
Yu Yonezawa, Yokohama, JP;
Takeaki Shimanouchi, Kawasaki, JP;
Naoyuki Mishima, Yokohama, JP;
Satoshi Ueda, Kawasaki, JP;
Xiaoyu MI, Kawasaki, JP;
Masahiko Imai, Kawasaki, JP;
Yu Yonezawa, Yokohama, JP;
Takeaki Shimanouchi, Kawasaki, JP;
Naoyuki Mishima, Yokohama, JP;
Satoshi Ueda, Kawasaki, JP;
Xiaoyu Mi, Kawasaki, JP;
Masahiko Imai, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a method for drive controlling a micro machine device including two electrodes opposing each other and a dielectric layer sandwiched therebetween, a control voltage in a rectangular waveform in which positive and negative polarities are alternately inverted is applied between the two electrodes. A current passing through the micro machine device due to the application of the control voltage are detected with respect to positive and negative sides, and parameters related to a capacitance of the micro machine device are acquired with respect to the positive and negative sides on the basis of the detected current. The control voltage is controlled so that the parameters acquired with respect to the positive and negative sides accord with each other. Thus, variation of the capacitance between the positive side and the negative side can be suppressed in switching drive of a variable capacitance device.