Movement detector employing constant current drive

Details Movement detector employing constant current drive Movement detector employing constant current drive

1989-02-21

1991-09-10

Wieder, Kenneth

Electricity: measuring and testing

Magnetic

Displacement

G01B 714

Patent

active

050477161

ABSTRACT:
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.

REFERENCES:
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patent: 4429276 (1984-01-01), Harimatsu et al.
patent: 4594548 (1986-06-01), Takahashi et al.
patent: 4628259 (1986-12-01), Takahashi et al.
patent: 4639807 (1987-01-01), Sekizawa et al.
patent: 4731580 (1988-03-01), Indo
patent: 4766376 (1988-08-01), Takahashi et al.

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