Nippon Seiki Co., Ltd.

Masataka Tanahashi

Yuki Suyama

Yuki Kikui

Provided is a position detecting device with which it is possible to suppress a concentration of stress. A position detecting device is provided with a lever member which rotates about a central axis of rotation O, a magnet unit, which is one example of a detected portion, that rotates about the central axis of rotation O as the lever member rotates and a magnetic detecting element, which is one example of a rotation detecting unit, that detects the rotation of the magnet unit. The lever member is provided with a thick plate portion, positioned in a location close to the central axis of rotation O, and a thin plate portion which is positioned farther from the central axis of rotation O than the thick plate portion, and which is formed thinner than the thick plate portion.

Position detection device

The present invention provides a magnet unit and a position detection device that are excellent in thermal shock resistance without the risk of being damaged due to a temperature change and that are capable of detecting a position with high accuracy. A magnet unit comprises: a magnet that moves in a linear or rotating manner relative to a magnetic detection element (magnetic detection section) for detecting a change in a magnetic field; and a magnet holding member that moves in a linear or rotating manner while being fixed to an object L to be detected and that holds the magnet attached thereto. The magnet holding member has a fixed part that is fixed to the object L to be detected and a magnet housing part to which the magnet is attached. The magnet housing part has openings where opposite end surface portions of the magnet are exposed.

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Niigata, Japan

Masataka Tanahashi