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:
May. 19, 2026
Filed:
Jun. 15, 2021
Hitachi High-tech Corporation, Tokyo, JP;
Motohiro Takahashi, Tokyo, JP;
Masaki Mizuochi, Tokyo, JP;
Shuichi Nakagawa, Tokyo, JP;
Raifu Yamamoto, Tokyo, JP;
Tomotaka Shibazaki, Tokyo, JP;
Keiichiro Hosobuchi, Tokyo, JP;
Akira Nishioka, Tokyo, JP;
Hironori Ogawa, Tokyo, JP;
Takanori Kato, Tokyo, JP;
Hitachi High-Tech Corporation, Tokyo, JP;
Abstract
Provided is a stage device comprising a stage, a Z-axis motor that magnetically floats the stage, and an X-axis motor that drives, in one axial direction within a plane, the stage floated by the Z-axis motor, wherein: the X-axis motor is provided with an X-axis coil, a pair of X-axis magnets that face each other and that sandwich the X-axis coil in the vertical direction without contacting the X-axis coil, and an X-axis yoke that holds the pair of X-axis magnets; the Z-axis motor is provided with a Z-axis coil, a Z-axis magnet, and a Z-axis yoke that holds the Z-axis magnet; and the Z-axis motor is disposed at a position that is below the X-axis motor such that the magnetic field which has leaked from the Z-axis motor is blocked by the X-axis yoke. Thus, it is possible to suppress magnetic field leakage and to perform high-speed positioning.