Rotation angle detection device
A technology of rotation angle detection and detection part, which is applied in the direction of measuring device, electric device, and electric/magnetic device to transmit sensing components, etc., which can solve the problem of the increase of magnetic field strength, the inability to correctly detect the direction of the magnetic field, and the inability to accurately detect the direction of the magnetic field. Detect problems such as rotation angle
Active Publication Date: 2012-07-18
ALPS ALPINE CO LTD
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However, in this rotation angle detection device, since the opening of the magnet has a substantially square shape, there is a possibility that the magnetic field strength in directions other than directions perpendicular to a pair of opposing sides magnetized with different polarities becomes large. Therefore, the expected direction of the magnetic field cannot be accurately detected, and as a result, the rotation angle of the object to be detected may not be detected with high accuracy.
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[0021] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0022] figure 1 It is a perspective view showing important parts of the rotation angle detection device according to one embodiment of the present invention. In addition, the rotation angle detection device according to the present embodiment is used, for example, to detect the rotation angle of an object to be detected such as a steering shaft of a vehicle. However, the device to which the rotation angle detection device according to the present embodiment is applied is not limited thereto, and it can be applied to any device that detects the rotation angle of the object to be detected.
[0023] Such as figure 1 As shown, the rotation angle detection device according to this embodiment is composed of a magnetic sensor unit 102 and a magnet 103, the magnetic sensor unit 102 is mounted on a substrate 101, and the magnet 103 is opposed to the ma...
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Provided is a rotation angle detection device, which can detect the rotation angle of an object at a high accuracy. The rotation angle detection device comprises a magnet (103) capable of being rotated along the object to be detected; and a magnetic sensor unit (102) arranged opposite to the magnet (103). The magnetic sensor unit (102) detects the rotation angle of the object to be detected along with the direction change of the magnetic field caused by the magnet (103). The rotation angle detection device is characterized in that the magnet (103) is provided with a rectangular opening part (103a) composed of plate-shaped annular bodies. The magnet (103) is also provided with an edge part on the longitudinal direction side of a group corresponding to the opening part and magnetized into different polarities. The magnetic sensor unit (102) is provided with a detection part. The surface of the detection part opposite to the magnet (103) is provided with a plurality of magnetic detection elements.
Description
technical field [0001] The invention relates to a rotation angle detection device, in particular to a rotation angle detection device which detects the rotation angle of a detected object through a magnetic detection element. Background technique [0002] A conventional rotation angle detection device is used, for example, to detect the rotation angle of an object to be detected such as a steering shaft of a vehicle. As this kind of rotation angle detection device has been proposed, it is equipped with a magnet composed of a rectangular ring body attached to the object to be detected and a magnetic detection element that detects the magnetic field generated by the magnet, and is based on the rotation of the magnet. A rotation angle detection device that detects a rotation angle of a subject by changing the direction of a magnetic field (for example, refer to Patent Document 1). In this rotation angle detection device, a magnet whose one side is magnetized as an N pole and t...
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IPC IPC(8): G01D5/12G01B7/30
Inventor 高原久直德永一郎信浓正绍
Owner ALPS ALPINE CO LTD