| 摘要 |
A buckle apparatus in which a permanent magnet and GMR element are provided. The polar axis of the permanent magnet is transverse to the direction a tongue plate is inserted. A shielding member is provided to an ejector of the buckle apparatus via a lever. When an inserted tongue plate of a vehicle seat belt pushes and moves the ejector as far as a position at which an engaging piece can engage with a through-hole, the shielding member is interposed between the permanent magnet and the GMR element, and the shielding member shields lines of magnetic force from the permanent magnet toward the GMR element. As a result, magnetic forces lines penetrating the GMR element are greatly reduced, and an electrical resistance value of the GMR element is suddenly and greatly changed. Thus, a buckle apparatus is provided which includes a detection mechanism that can reliably detect when the tongue plate has been inserted into the apparatus main body.
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