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:
Jan. 08, 2013
Filed:
Oct. 20, 2010
Haruhiko Ito, Kyoto, JP;
Toshihide Sonoda, Kyoto, JP;
Daisuke Tsunashima, Kyoto, JP;
Takuya Yamane, Kyoto, JP;
Shigeo Kawamura, Kyoto, JP;
Yoshihisa Kitamura, Kyoto, JP;
Hisakazu Motomochi, Kyoko, JP;
Haruhiko Ito, Kyoto, JP;
Toshihide Sonoda, Kyoto, JP;
Daisuke Tsunashima, Kyoto, JP;
Takuya Yamane, Kyoto, JP;
Shigeo Kawamura, Kyoto, JP;
Yoshihisa Kitamura, Kyoto, JP;
Hisakazu Motomochi, Kyoko, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A chucking device includes a turntable fixed to a shaft having a central axis and a cone arranged axially above the turntable. An annular yoke is arranged above a sliding portion of the cone and fixed to the shaft, and a clamp magnet is fixed to the yoke through an adhesive agent. The yoke includes an upper surface having an annular recess defined in a concentric relationship with the central axis, the adhesive agent being applied on a region of the upper surface existing radially inwards of the recess. The recess includes a radial outer wall parallel to the central axis and a radial inner wall inclined radially inwards and axially upwards. The angle between the radial outer wall and a lower surface of the clamp magnet is greater than the angle between the radial inner wall and the lower surface of the clamp magnet.