| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level detector capable of reducing the size and cost by reducing the frictional force acting between a resistance element and a contact. SOLUTION: A contact member 7 for conducting an arm member 6 with an electrode part 5b of the resistance element 5 is formed on a disk having a through hole 7a. The contact member 7 is held by the arm member 6 so that the through hole 7a is engaged with the arm member 6 and the arm member 6 can be rotated as a rotation shaft. Thus, the arm member 6 rotates according to variation of the position of liquid level 17a, the contact member 7 rolls on the electrode part 5b while conducting with the electrode part 5b of the resistance element 5. Thus, the frictional force acting on a contact part between the contact member 7 and the resistance element 5 can be reduced. Therefore, the physical size of a magnet 8 can be miniaturized, or the magnet 8 can be formed of inexpensive magnet of a magnetic flux density smaller than that of a conventional liquid level detector, namely small maximum energy product. COPYRIGHT: (C)2009,JPO&INPIT
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