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A rotational angle detecting apparatus includes a rotating member secured to one end of the rotating shaft of an object to be detected for rotation along with the rotating shaft which is rotatable in response to a change in a physical quantity. The apparatus further includes a non-rotating member fi

A rotational angle detecting apparatus includes a rotating member secured to one end of the rotating shaft of an object to be detected for rotation along with the rotating shaft which is rotatable in response to a change in a physical quantity. The apparatus further includes a non-rotating member fixedly positioned opposite to the rotating member, a magnetic field generating source disposed on one of the rotating member and the non-rotating member to generate a magnetic field, and a magnetic sensing element disposed on the other of the rotating member and the non-rotating member to generate an output signal which varies in dependence on the direction of the magnetic field.

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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 sp

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.