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:
Oct. 06, 2009
Filed:
May. 12, 2006
Masahisa Niwa, Suita, JP;
Yukiko Inooka, Takarazuka, JP;
Yoshio Mitsutake, Kashiba, JP;
Tomohiro Ota, Takarazuka, JP;
Masahisa Niwa, Suita, JP;
Yukiko Inooka, Takarazuka, JP;
Yoshio Mitsutake, Kashiba, JP;
Tomohiro Ota, Takarazuka, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
A position sensor with excellent linearity of coil impedance is provided. This position sensor is equipped with a tubular detection coil, a magnetic core movable in the detection coil, a drive circuit for the detection coil, a signal processing circuit for converting a change in impedance of the detection coil into an electric signal, and a shield member disposed around the detection coil. The shield member is a tubular member having a first inner surface for surrounding an axial region of the detection coil, and a second inner surface for surrounding another axial region of the detection coil. The tubular member is formed such that a distance between the second inner surface and the detection coil is smaller than the distance between the first inner surface and the detection coil.