JPH0415077U

JPH0415077U -

Info

Publication number: JPH0415077U
Application number: JP5475290U
Authority: JP
Priority date: 1990-05-25
Filing date: 1990-05-25
Publication date: 1992-02-06

Description

[Brief explanation of the drawing]

第１図乃至第４図は本考案の第１の実施例を示
すもので、第１図は磁気センサの横断上面図、第
２図はＶＴＲのキヤプスタンモータの斜視図、第
３図は磁気抵抗素子の正面図、第４図は作用説明
用の特性図である。また、第５図及び第６図は、
第１の実施例に関連する本考案の夫々異なる他の
実施例を示す磁気センサの縦断側面図である。そ
して、第７図乃至第９図は本考案の第２の実施例
を示すもので、第７図は磁気センサの背面図、第
８図は磁気センサの縦断側面図、第９図は第４図
相当図である。また、第１０図及び第１１図は第
２の実施例に関連する本考案の夫々異なる他の実
施例を示すバイアスマグネツトの斜視図及びねじ
部材の縦断側面図である。第１２図及び第１３図
は従来例を示す夫々第２図相当図及びホルダを除
いて示す磁気センサの斜視図である。図面中、１２……基板、１４……ロータ、１７
……磁極部、１８，３４……磁気センサ、１９，
２８，３０，３５……ホルダ、２０，３６……磁
気抵抗素子、２１，２７，３３，３８，４０，４
２……バイアスマグネツト、２２，２９，３１，
３７……マグネツト収容部を示す。 1 to 4 show a first embodiment of the present invention. FIG. 1 is a cross-sectional top view of a magnetic sensor, FIG. 2 is a perspective view of a VTR capstan motor, and FIG. 3 is a cross-sectional top view of a magnetic sensor. FIG. 4, a front view of the magnetoresistive element, is a characteristic diagram for explaining the operation. In addition, Figures 5 and 6 are
FIG. 6 is a longitudinal side view of a magnetic sensor showing other embodiments of the present invention related to the first embodiment; 7 to 9 show a second embodiment of the present invention, in which FIG. 7 is a rear view of the magnetic sensor, FIG. 8 is a vertical side view of the magnetic sensor, and FIG. 9 is a fourth embodiment of the present invention. It is a figure equivalent figure. 10 and 11 are a perspective view of a bias magnet and a longitudinal sectional side view of a screw member, respectively, showing other embodiments of the present invention related to the second embodiment. 12 and 13 are a diagram corresponding to FIG. 2 showing a conventional example and a perspective view of a magnetic sensor shown without a holder, respectively. In the drawings, 12...board, 14...rotor, 17
... Magnetic pole part, 18, 34 ... Magnetic sensor, 19,
28, 30, 35... Holder, 20, 36... Magnetoresistive element, 21, 27, 33, 38, 40, 4
2...Bias magnet, 22, 29, 31,
37... Indicates a magnet housing section.

Claims

[Claims for Utility Model Registration] 1. A device comprising a holder, a magnetoresistive element fixed to the holder, and a bias magnet, wherein the bias magnet changes the bias magnetic field exerted on the magnetoresistive element by movement. A magnetic sensor, characterized in that the magnetic sensor is movably provided in the holder so as to move. 2 comprises a holder, a magnetoresistive element fixed to the holder, and a bias magnet, and the bias magnet is rotated around the holder so that the bias magnetic field exerted on the magnetoresistive element is changed by rotation. A magnetic sensor characterized in that it is movably installed.