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:
Dec. 05, 2006
Filed:
Aug. 25, 2005
Yuzuru Suzuki, Shizuoka-ken, JP;
Sakae Fujitani, Shizuoka-ken, JP;
Naoyuki Harada, Shizuoka-ken, JP;
Kunitake Matsushita, Shizuoka-ken, JP;
Yuzuru Suzuki, Shizuoka-ken, JP;
Sakae Fujitani, Shizuoka-ken, JP;
Naoyuki Harada, Shizuoka-ken, JP;
Kunitake Matsushita, Shizuoka-ken, JP;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been shortcomings of a VCM type actuator. A composite electromagnetic actuator apparatus employs the foregoing electromagnetic actuator. The electromagnetic actuator is equipped with a stationary assembly that includes two coils disposed coaxially with each other inside a hollow stator yoke composed of a soft magnetic material, and a movable assembly composed of a movable magnet unit and a movable yoke unit both disposed inside the coils with a very small clearance therefrom so as to be movable in the axial direction, wherein the movable assembly travels in the axial direction by the interaction between a magnetic field generated by the movable magnet unit and a current passing through the coils.