Magnetic detection device including resistance adjusting unit

Details Magnetic detection device including resistance adjusting unit Magnetic detection device including resistance adjusting unit

2008-03-18

2008-03-18

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S207210, C324S249000, C257S427000

Reexamination Certificate

active

07345477

ABSTRACT:
In a magnetic detection device for obtaining an output from between a variable resistance element using the magnetoresistance effect and a reference resistance element, a balance between resistance values in the device can be easily adjusted in a wide range. A voltage is applied to a resistance adjusting unit, a reference resistance element, and a variable resistance element, which are serially connected, and is also applied to another variable resistance element, another reference resistance element, and another resistance adjusting unit, which are serially connected. When subjected to a magnetic field of a predetermined size, resistance values of the variable resistance elements change, and as a result, the potentials of output terminals change. Each of the resistance adjusting units includes serially connected parallel portions each including a plurality of parallel connected resistance elements. The resistance value of the resistance adjusting unit can be changed by bringing one of the parallel connected resistance elements into a non-conduction state.

REFERENCES:
patent: 6222361 (2001-04-01), Shimano et al.
patent: 6452382 (2002-09-01), Tokunaga et al.
patent: 2001-35702 (2001-02-01), None
patent: 2001-44001 (2001-02-01), None

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