Non-contact rotational angle detecting sensor
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United States of America Patent
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Jan 31, 2012
Grant Date -
Jun 11, 2009
app pub date -
Nov 6, 2008
filing date -
Dec 11, 2007
priority date (Note) -
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Abstract
There is provided a non-contact rotational detecting sensor comprising a ring-shaped permanent magnet which rotates integrally with a detection object of a rotational angle and of which a magnetic pole changes along the circumferential direction, a ring-shaped inside magnetic flux collecting yoke for surrounding an outer peripheral surface of the ring-shaped permanent magnet in a constant gap, a ring-shaped outside magnetic flux collecting yoke for surrounding an outer peripheral surface of the ring-shaped inside magnetic flux collecting yoke in a constant gap, and a hole IC arranged in a gap formed in the ring-shaped inside magnetic flux collecting yoke, wherein an axial height of the ring-shaped inside magnetic flux collecting yoke is changed along a circumferential direction of the ring-shaped inside magnetic flux collecting yoke.
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