| 摘要 |
When a magnetic substance ( 104 ) is brought close to or separated away from an MR sensor ( 102 ), so that a direction of a magnetic flux ( 103 ) caused to flow through the MR sensor ( 102 ) is changed, an output voltage from the MR sensor ( 102 ) changes. Also, when a change in output voltage from the MR sensor ( 102 ) exceeds a threshold set by a designer, a comparison portion ( 303 ) judges that switches ( 309 a, 309 b) should be turned ON, and outputs suitable signals to corresponding portions, respectively.
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