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Rotational angle detecting apparatus

  • US 4,392,375 A
  • Filed: 01/26/1981
  • Issued: 07/12/1983
  • Est. Priority Date: 01/30/1980
  • Status: Expired due to Term
First Claim
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1. A rotational angle detecting apparatus comprising:

  • a throttle valve rotatably mounted in a throttle body;

    a yoke made of a magnetical material and fixed to a shaft of said throttle valve;

    a pair of permanent magnets so fixed to said yoke with a space, to generate a parallel magnetic field in said space; and

    magnetic sensing means adjustably mounted in a support in said space to generate an electrical output in response to an angular displacement of said permanent magnets with respect to said magnetic sensing means, said magnetic sensing means including a ferromagnetic metal magneto-resistance element whose electric resistance varies in dependence on changes of an angle formed by a direction of the magnetic field and a direction of a current flowing therethrough.

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