| 摘要 |
PURPOSE:To remarkably improve detecting sensitivity and to obtain an output signal with a high SN ratio even if the diameter of a magnetic bubble is reduced by bridge-connecting two pairs of main magnetic resistance elements to dummy magnetic resistance elements to constitute a bubble detector. CONSTITUTION:When it is defined that the resistance values of the main magnetic resistance element 1 and a dummy magnetic resistance element 2 in the 1st bubble detector D1 are R1 and R2 and the resistance values of a main magnetic resistance element 3 and a dummy magnetic resistance element 4 of the 2nd bubble detector D2 are R3 and R4, the 1st and 2nd main elements 1, 3 and the 1st and 2nd dummy elements 2, 4 are combined so as to be opposed to each other and bridge-connected each other and then the bridge-connected elements are connected between a terminal COM to which a prescribed contact voltage E is applied and a terminal GND, so that the existence of a magnetic bubble is detected between the 1st and 2nd main elements 1, 3 and between the 1st and 2nd dummy elements 2, 4 and a detecting voltage V based on a differential voltage is detected between terminals DET (+) and DET (-).
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