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    • 2. 发明授权
    • Magnetic position detection apparatus having two magnetic recording
medium tracks with magnetoresistors arranged in a bridge circuit so as
to eliminate even order harmonic distortion
    • 磁性位置检测装置具有布置在桥式电路中的具有磁阻器的两个磁记录介质轨道,以消除偶次谐波失真
    • US5019776A
    • 1991-05-28
    • US355343
    • 1989-05-23
    • Syooichi KawamataTadashi TakahashiKunio Miyashita
    • Syooichi KawamataTadashi TakahashiKunio Miyashita
    • G01P3/487G01D5/14G01D5/16G01D5/245G01P3/488
    • G01D5/145G01P3/488
    • An apparatus for magnetically detecting a positional relation between first and second members the positions of which change relative to each other comprises a magnetic recording medium carried on the first member and a magnetic sensor substrate supported by the second member. Two or more tracks each including a multiplicity of magnetic poles arranged at a predetermined pitch are provided on the magnetic recording medium, corresponding to the respective phases of two or more detection signals to be detected by the apparatus and in a direction in which the positional relation between the first and second members changes. The magnetic poles in any one of the tracks are shifted with respect to the magnetic poles in the other track by an amount corresponding to a phase difference between the detection signal for the phase which corresponds to the one track and the detection signal for the phase which corresponds to the other track. The magnetic sensor substrate includes a plurality of magnetoresistive elements which are respectively provided corresponding to the tracks and the electrical resistance value of each of which changes in response to a magnetic field originating from the corresponding track. The magnetoresistive elements are combined to generate electric signals as the detection signals. Each of the magnetoresistive elements corresponding to any one of the tracks and the corresponding one of the magnetoresistive elements corresponding to the other track are placed at the same position when viewed in the direction in which the positional relation between the first and second members changes.
    • 一种用于磁性检测第一和第二构件之间的位置关系的装置,其位置彼此相对变化,包括承载在第一构件上的磁记录介质和由第二构件支撑的磁传感器基板。 在磁记录介质上设置两个或更多个磁道,每个磁道包括以预定间距排列的多个磁极,对应于由装置检测的两个或更多个检测信号的相位和位置关系 第一和第二个成员之间的变化。 任何一个轨道中的磁极相对于另一轨道中的磁极移动相当于对应于一个磁道的相位的检测信号和相位检测信号之间的相位差的量, 对应其他轨道。 磁传感器基板包括分别对应于轨道设置的多个磁阻元件,并且每个电阻值响应于来自相应轨道的磁场而改变。 磁阻元件被组合以产生电信号作为检测信号。 与第一和第二构件之间的位置关系改变的方向观察时,对应于轨道中的任何一个的磁阻元件和对应于另一个轨道的对应的一个磁阻元件中的每一个被放置在相同的位置。
    • 8. 发明授权
    • Magnetic sensor for magnetically detecting the position of a movable body
    • 磁传感器,用于磁性检测可移动体的位置
    • US4786870A
    • 1988-11-22
    • US916699
    • 1986-10-08
    • Syooichi KawamataTadashi TakahashiKunio Miyashita
    • Syooichi KawamataTadashi TakahashiKunio Miyashita
    • G01D5/245G01B7/00G01D5/14G01D5/16G01D5/249H03M1/28G01B7/28
    • G01D5/145H03M1/285
    • A magnetic position detector having a rotary magnetic recording medium which is movable with a movable body the position of which is to be detected. The rotary magnetic recording medium is divided into plural channels, each of which includes two tracks. A magnetic sensor is disposed to face the magnetic recording medium with a predetermined air gap therebetween and includes two sets of magnetoresistive elements spaced by a predetermined distance for each channel. Each set of magnetoresistive elements includes two elements wherein the first elements of the two sets face one of the tracks of a channel and the second elements of the other of the two sets faces the other track and the first and second elements of the two sets are formed as one body with adjacent ends of the first and second elements being coupled with each other. The coupled adjacent ends are connected to either one of first terminals for deriving output voltages from the magnetoresistive elements or to second terminals for supplying the magnetoresistive elements with source voltage. The non-adjacent ends of the first and second elements which are opposite to the coupled ends are connected to the other of the first and second terminals. In this manner, the sensor can be made small in size and the resistivity against noise is enhanced.
    • 一种具有旋转磁记录介质的磁性位置检测器,其可移动的位置被检测的可移动体。 旋转磁记录介质被分成多个通道,每个通道包括两个轨道。 磁传感器设置成面对磁记录介质,其间具有预定的气隙,并且包括为每个通道隔开预定距离的两组磁阻元件。 每组磁阻元件包括两个元件,其中两组的第一元件面对通道的轨道中的一个,并且两组中的另一个的第二元件面对另一个轨道,并且两组的第一和第二元件是 形成为一体,第一和第二元件的相邻端彼此连接。 耦合的相邻端连接到用于从磁阻元件导出输出电压的第一端子中的任一个或用于向磁阻元件提供源极电压的第二端子。 与耦合端相对的第一和第二元件的不相邻的端部连接到第一和第二端子中的另一个。 以这种方式,可以使传感器尺寸变小,并提高抗噪声电阻率。