Rotation detecting apparatus
A technology of rotation detection and magnetic rotor, which is applied in measurement devices, linear/angular velocity measurement, velocity/acceleration/shock measurement, etc., can solve the problems of limited range of magnetic vector deflection angle adjustment, low design freedom, etc., to achieve design freedom The effect of increasing the degree of detection and improving the detection sensitivity
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no. 1 example
[0051] The present inventors have previously studied a rotation detecting device as a comparative example of the first embodiment of the present invention. This device detects rotation using changes in the resistance of the magneto-resistive element. FIG. 17 shows a planar structure of such a rotation detecting device such as an engine crank angle sensor.
[0052]As shown in FIG. 17, in this rotation detecting device, the sensor chip 11 is arranged in such a manner that the sensor chip 11 is disposed opposite to the rotor "RT" corresponding to the object to be detected. The sensor chip 11 is equipped with a magnetoresistive element pair 1 composed of two magnetoresistive elements MRE1 and MRE2, and another magnetoresistive element pair 2 composed of two magnetoresistive elements MRE3 and MRE4. The sensor chip 11 has then been produced in the form of an integrated circuit together with the processing circuitry of this sensor chip 11 and the integrated sensor chip is molded wit...
no. 2 example
[0103] Before explaining the second embodiment mode of the rotation detecting device according to the present invention, the basic idea of the present invention is explained with reference to FIGS. 19 to 21 . It should be understood that, for ease of understanding, a conventional rotation detection device using a bias magnet is taken as an example, and a part of the bias magnet is shown in an enlarged state. In this bias magnet, the magnetic field strength is set substantially uniformly in all peripheral portions of the bias magnet. For brevity, the same reference numerals shown in FIG. 17 or FIG. 18 above will be used to denote the same, or similar structural elements in FIG. 19 to FIG. 21 .
[0104] FIG. 19 shows in an enlarged manner a perspective view structure of the sensor chip 11 and the bias magnet 13, which constitute the rotation detection means. As shown in FIG. 19, the bias magnet 13 is formed in a hollow cylindrical shape and has a hollow portion 14, and the ho...
no. 3 example
[0128] FIG. 29 shows a rotation detection device according to a third embodiment mode of the present invention, wherein the rotation detection device is designed based on the above basic point of view. Referring to Fig. 29, the rotation detecting device according to the third embodiment of the present invention will be described in detail below. It should be noted that since the structure of the rotation detection device is substantially the same as that of the conventional rotation detection device described above, the same reference numerals in the conventional rotation detection device will be used to denote structural members having the same or similar functions, and thus detailed description thereof will be omitted. .
[0129] FIG. 29 schematically shows the state of the magnetic field generated by the bias magnet 13 used in the rotation detecting device according to the first embodiment mode, which corresponds to FIG. 20 . As shown in FIG. 29 , the bias magnet 13 is sha...
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