Liquid level sensing apparatus
First Claim
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1. A liquid level sensing apparatus comprising:
- a housing including a bearing portion;
a magnet producing a magnetic field;
a magnetoelectric transducer element fixed to the housing and arranged to perform a magnetic detection to convert an intensity of the magnetic field to an electric signal; and
a rotating part supported rotatably on the bearing portion, fixed with an arm arranged to rotate in accordance with a liquid level, housing the magnet, and formed with an exposure hole exposing a surface of the magnet, the surface being located out of a magnetic circuit subjected to the magnetic detection of the magnetoelectric transducer element.
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Abstract
In a liquid level sensing apparatus, a rotating part is fixed with an arm. The arm is arranged to rotate in accordance with a liquid level. The rotating part is supported rotatably on a bearing portion of a housing. A magnet is housed in the rotating part. A magnetoelectric transducer element fixed to the housing is arranged to perform a magnetic detection to convert an intensity of a magnetic field produced by the magnet to an electric signal. The rotating part is formed with an exposure hole exposing a surface of the magnet. The exposed surface of the magnet is located out of a magnetic circuit subjected to the magnetic detection of the magnetoelectric transducer element.
15 Citations
9 Claims
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1. A liquid level sensing apparatus comprising:
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a housing including a bearing portion; a magnet producing a magnetic field; a magnetoelectric transducer element fixed to the housing and arranged to perform a magnetic detection to convert an intensity of the magnetic field to an electric signal; and a rotating part supported rotatably on the bearing portion, fixed with an arm arranged to rotate in accordance with a liquid level, housing the magnet, and formed with an exposure hole exposing a surface of the magnet, the surface being located out of a magnetic circuit subjected to the magnetic detection of the magnetoelectric transducer element. - View Dependent Claims (2, 3, 4, 5)
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6. A liquid level sensing apparatus comprising:
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a housing including a bearing portion; a magnet including a first magnet surface extending in a first direction and a second magnet surface extending in a second direction crossing the first direction; a magnetoelectric transducer element fixed to the housing, and located at a position confronting the first magnet surface of the magnet to perform magnetic detection to convert an intensity of a magnetic field produced by the magnet, to an electric signal; and a rotating member arranged to rotate the magnet in accordance with a liquid level, the rotating member being supported rotatably by the bearing portion of the housing, and the rotating member including a wall portion formed with an exposure hole exposing a region of the second magnet surface of the magnet. - View Dependent Claims (7, 8, 9)
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Specification