JPS61139416U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、ステツピングモータによる磁気抵抗
効果素子装置の一部の平面図、第２図はその断面
図、第３図は磁気抵抗効果素子装置の回路図、第
４図は信号の波形図、第５図は他の実施例での接
続状態を示す回路図である。 １……磁気抵抗効果素子装置、２……ステツピ
ングモータ、３……ステータ、４……ポール、５
……励磁コイル、６……ロータコア、６ａ，６ｂ
……極歯、７……永久磁石、８……軸、１１，１
２……１８……磁気抵抗効果素子、２０……電源
、２１，２２……差動増幅器。 Fig. 1 is a plan view of a part of a magnetoresistive element device using a stepping motor, Fig. 2 is a sectional view thereof, Fig. 3 is a circuit diagram of the magnetoresistive element device, and Fig. 4 is a signal waveform diagram. , FIG. 5 is a circuit diagram showing a connection state in another embodiment. DESCRIPTION OF SYMBOLS 1... Magnetoresistive element device, 2... Stepping motor, 3... Stator, 4... Pole, 5
... Excitation coil, 6 ... Rotor core, 6a, 6b
...Pole tooth, 7...Permanent magnet, 8...Shaft, 11,1
2... 18... Magnetoresistive element, 20... Power supply, 21, 22... Differential amplifier.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 被検体の磁束密度変化に対応して、抵抗値が変
化する複数の磁気抵抗効果素子を、その抵抗値変
化が１／２周期ずれるように、上記被検体に対し
配置し、かつ直列に接続し、その直列回路の両端
に電源を接続し、上記複数の磁気抵抗効果素子の
接続中点より第１の信号を導き出し、一方上記複
数の磁気抵抗効果素子の近傍に他の複数の磁気抵
抗効果素子を上記１／２周期のずれと逆の方向に
１／２周期ずれるように上記被検体に対し配置し
、かつ直列に接続し、その直列回路の両端に電源
を接続し、上記他の複数の磁気抵抗効果素子の接
続中点より第２の信号を導き出し、上記第１の信
号および上記第２の信号を差動増幅器に入力する
ことを特徴とする磁気抵抗効果素子装置。 A plurality of magnetoresistive elements whose resistance values change in response to changes in the magnetic flux density of the test object are arranged with respect to the test object and connected in series so that the resistance changes are shifted by 1/2 period. A power supply is connected to both ends of the series circuit, and a first signal is derived from the connection midpoint of the plurality of magnetoresistive elements, while a plurality of other magnetoresistive elements are connected near the plurality of magnetoresistive elements. are arranged with respect to the above-mentioned object so as to be shifted by 1/2 period in the opposite direction to the above-mentioned 1/2 period deviation, and connected in series, and a power supply is connected to both ends of the series circuit, and the other plurality of A magnetoresistive element device, characterized in that a second signal is derived from a connection midpoint of the magnetoresistive element, and the first signal and the second signal are input to a differential amplifier.