| 摘要 |
A magnetic movement detector employing a constant current drive system wherein the consumed power is reduced and temperature increases suppressed, thereby preventing a decrease in the output voltage. A magnetic recording medium is magnetized with a repetitive signal having a wavelength lambda . A magnetic resistance element disposed adjacent the recording medium is composed of 2m serially connected magnetic resistance strips which are arranged at intervals of (n-1/2) lambda , where m and n are natural numbers. A DC source is connected to interconnected ends of two adjacent ones of the strips, while constant current source are connected to ends of respective other ones of the strips. An output signal is produced as the difference between the voltages at the ends of the latter two strips.
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