JPH08201016A - Rotation angle detector - Google Patents

Abstract

(57) [Summary] [Structure] The magnetoresistive element expands the degree of freedom of the element assembly by manufacturing one resistance part as one chip part and mounting it on a substrate with a target pattern layout created separately. At the same time, standardize the device. [Effect] Since the magnetoresistive element has one resistance part manufactured as one chip component, when the shape of the magnetic flux density changing means is changed, the pattern arrangement of the substrate on which this chip component is mounted is changed. By doing so, an optimal magnetoresistive element arrangement can be obtained without changing the magnetoresistive element chip, and standardization of the elements can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device for detecting a rotation angle and a rotation speed, and more particularly to a structure of a rotation detecting device using a magnetoresistive element.

[0002]

2. Description of the Related Art In a conventional device, a plurality of magnetoresistive elements are formed on one substrate by patterning, as described in Japanese Patent Application Laid-Open No. 1-136018. Therefore, the optimum element pattern arrangement is dealt with by changing the element patterning mask or the like according to the shape of the magnetic flux density changing means to be combined.

[0003]

In the above-mentioned prior art, since the magnetoresistive element assembly has to be prepared according to the shape of the magnetic flux density changing means to be combined, the element patterning is performed when the shape of the magnetic flux density changing means is changed. Since it is necessary to change the mask and the like, it takes a long time to manufacture the element, and the element cannot be standardized, resulting in an increase in cost.

[0004]

In order to solve the above-mentioned problems, a magnetoresistive element is manufactured by forming one resistance part as one chip part, and mounting it on a substrate having a target pattern arrangement which is separately prepared. The degree of freedom of the element assembly will be expanded and the element will be standardized.

[0005]

The magnetoresistive element has one resistance part manufactured as one chip part, so that when the shape of the magnetic flux density changing means is changed, the pattern arrangement of the substrate on which this chip part is mounted is changed. By doing so, the optimum magnetoresistive element arrangement can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing a magnetoresistive element assembly according to an embodiment of the present invention.

The magnetoresistive element chip 1 is mounted on a substrate 2 on which a pattern having an element pitch determined according to the shape of the magnetic flux density changing portion to be combined is formed. As a result, when the shape of the magnetic flux density changing portion to be combined is changed, the substrate 2
It is possible to change to the optimum magnetoresistive element arrangement simply by changing the pattern (pitch).

FIG. 2 is a diagram showing the circuit configuration of FIG.

A half bridge is formed by the magnetoresistive element 1'and the substrate 2 '.

FIG. 3 is a view showing a combination of a rotation angle detecting device according to an embodiment of the present invention and a gear.

A magnetoresistive element assembly formed of the magnetoresistive element chip 1 and the substrate 2 is arranged so as to face the gear 10, and a bias magnet 3 is provided behind the assembly.
To place. When the gear 10 rotates, the magnetic flux density applied to the magnetoresistive element 1 changes, and the resistance value of the element changes, so that the change in magnetic flux is converted into an electric signal to detect the rotation angle. These elements and magnets are power supply, ground,
Case 4 having connector 5 for receiving and outputting output signals
Fixed to. The circuit board 6 is a circuit that shapes the waveform of the output signal of the magnetoresistive element assembly.

FIG. 4 shows an embodiment in which a substrate on which the magnetoresistive element is mounted and a circuit board for shaping the output voltage of the magnetoresistive element are integrated.

By forming a circuit 6'for shaping the output voltage of the magnetoresistive element on the board 2 on which the magnetoresistive element chip 1 is mounted, the connections between the boards are reduced.

FIG. 5 shows an embodiment in which the embodiment of FIG. 4 is assembled and combined with a gear.

A magnetoresistive element assembly formed of the magnetoresistive element chip 1 and the substrate 2 is arranged so as to face the gear 10, and a bias magnet 3 is provided behind the assembly.
To place. When the gear 10 rotates, the magnetic flux density applied to the magnetoresistive element 1 changes, and the resistance value of the element changes, so that the change in magnetic flux is converted into an electric signal to detect the rotation angle. These elements and magnets are power supply, ground,
Case 4 having connector 5 for receiving and outputting output signals
Fixed to. Circuit is magnetoresistive element assembly substrate 2
Waveform shaping is performed on the output signal of the magnetoresistive element formed above.

FIG. 6 shows an application example of FIG. 1 which is a magnetoresistive element assembly of two-channel three-signal output of one-phase output and two-phase output.

A magnetoresistive element chip 1 is mounted on a substrate 2 which is set to a desired element arrangement pattern for one-phase output and two-phase output. In this way, when the two-channel output is to be obtained, the size of the element itself becomes very large because the patterning is conventionally performed at the time of element production. Since the cost of the element is determined by the size of the element, the cost is increased. According to the present embodiment, since the element can be prepared by forming a substrate on which the element is mounted without changing,
The cost can be reduced.

[0019]

According to the magnetoresistive element, one resistance portion is manufactured as one chip component, so that when the shape of the magnetic flux density changing means is changed, the pattern arrangement of the substrate on which this chip component is mounted is arranged. By changing, it is possible to obtain the optimum magnetoresistive element arrangement without changing the magnetoresistive element chip and standardize the element.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a magnetoresistive element assembly that is an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the circuit configuration of FIG.

FIG. 3 is an explanatory view showing a combination of a rotation angle detecting device according to an embodiment of the invention and a gear.

FIG. 4 is a perspective view of an embodiment in which a substrate on which a magnetoresistive element is mounted and a circuit board that shapes the output voltage of the magnetoresistive element are integrated.

5 is a cross-sectional view of an embodiment in which the embodiment of FIG. 4 is assembled and combined with a gear.

6 is a perspective view of a two-channel three-signal output magnetoresistive element assembly of one-phase output and two-phase output in the application example of FIG. 1. FIG.

[Explanation of symbols]

1 ... Magnetoresistive element chip, 2 ... Magnetoresistive mounting substrate, 3 ...
Magnet, 4 ... Case, 5 ... Connector, 6 ... Wave shaping circuit board, 10 ... Gear.

Claims (14)

[Claims] Claim: What is claimed is: 1. A magnet for detecting rotation in a rotation angle detecting device comprising an assembly of a magnetoresistive element having a plurality of magnetoresistive portions, a magnet biasing a magnetic flux to the assembly of the magnetoresistive element, and a case holding these. When setting the optimal magnetoresistive element placement pattern according to the shape of the magnetic flux changing part of the rotating body made of material, create one magnetoresistive element part as one element chip part and create it in the desired placement A rotation angle detecting device, characterized in that the one element chip component can correspond to an arbitrary shape of a rotating body by forming a circuit by mounting it on a substrate. 2. The rotation angle detecting device according to claim 1, wherein the material of the magnetoresistive element is InSb. 3. The rotation angle detecting device according to claim 2, wherein the InSb magnetoresistive element is a bulk type. 4. The rotation angle detecting device according to claim 2, wherein the InSb magnetoresistive element is a vapor deposition type. 5. The rotation angle detecting device according to claim 1, wherein the substrate on which the element chip component is mounted is a hybrid IC substrate. 6. The rotation angle detecting device according to claim 1, wherein the substrate on which the magnetoresistive element chip component is mounted is a glass epoxy printed substrate. 7. The rotation angle detecting device according to claim 1, wherein the substrate on which the element chip component is mounted is a flexible substrate using polyimide. 8. The rotation angle detecting device according to claim 1, wherein a power source, a ground, and an output of the magnetoresistive element are received by a connector formed in a case. 9. The rotation angle detection device according to claim 1, wherein a circuit for shaping the output of the magnetoresistive element is incorporated in a case. 10. The rotation angle detecting device according to claim 9, wherein the power source, the ground, and the output are received by a connector formed on the case. 11. The rotation angle detection device according to claim 9, wherein a substrate on which the magnetoresistive element is mounted and a substrate for waveform shaping are integrated. 12. The rotation angle detection device according to claim 11, wherein the substrate is a hybrid IC substrate. 13. The rotation angle detecting device according to claim 11, wherein the substrate is a glass epoxy printed circuit board. 14. The rotation angle detecting device according to claim 11, wherein the substrate is a flexible substrate using polyimide.