JPH0438253Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to the structure of a geomagnetic azimuth sensor used in a position coordinate measuring device.

[Prior art]

A position coordinate measuring device is mounted on a moving body such as a car, and detects the geomagnetic direction while moving.
This is a device that determines the position coordinates of the point where you are currently located. Such a device is, for example, disclosed in Japanese Patent Application Laid-Open No. 1986-
As disclosed in Publication No. 99016, when three magnetic field vector detectors are arranged at certain intervals on a vertical line (Z-axis), the Z-axis can be adjusted without being affected by the magnetic field of surrounding magnetized objects. It is necessary to determine both the X and Y components of the magnetic field in the plane orthogonal to . That is, it is assumed that the coordinate axes of the three magnetic field vector detectors are set with high precision, and if these precisions are poor, the accuracy of the detected position will also be poor.

[Purpose of invention]

Therefore, an object of the present invention is to provide a structure of a geomagnetic azimuth sensor that allows the coordinate axes of a plurality of magnetic field vector detectors to be set with high precision.

[Structure of the idea]

The geomagnetic azimuth sensor according to the present invention is a geomagnetic azimuth sensor in which a plurality of magnetic field vector detectors, each of which is wound perpendicularly to a bobbin containing a core, are arranged at intervals in the vertical direction. The plurality of magnetic field vector detectors each having a substantially cylindrical bobbin finished with end face precision are sandwiched from above and below by spacers finished with predetermined end face precision, and the windings are arranged in the same direction. and the substantially cylindrical bobbins arranged vertically in parallel;
Each side of the spacer is provided with grooves that connect with each other in the vertical direction, and a support rod is attached to the groove,
The bobbin is housed in a cylindrical cover, and a joining end surface of at least one of the substantially cylindrical bobbin and the spacer,
It is characterized by providing at least one convex portion on one side and at least one concave portion into which the convex portion fits on the other side.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the X,
It shows Y and Z coordinate axis components.

Such a geomagnetic direction sensor requires the following conditions.

Axis X ⊥ Axis Y, Axis X ⊥ Axis Y, Axis X ⊥
Axis Y.

Plane α ₁ Plane α ₂ Plane α ₃ .

The axes X, X, and X are each within the plane β.

The axes Y, Y, and Y each lie within the plane γ.

Plane β⊥plane γ.

All of these conditions are necessary conditions, and the present invention attempts to configure a three-stage magnetic field vector detector so as to satisfy these conditions.

That is, this embodiment is characterized by a structure in which the orthogonality accuracy or parallelism required from the mechanical (processing) point of view is improved in the three-tier stacked geomagnetic azimuth sensor.

FIG. 2 shows an embodiment of the present invention in a partially cutaway manner. Three magnetic field vector detectors 1 each include a cylindrical base spacer 2 and spacer 3, spacer 3 and spacer 4, and spacer 4 and top spacer 5.
It is supported by being sandwiched between.

Incidentally, as shown in an enlarged view in FIG. 3, the magnetic field vector detector 1 is constructed by winding a wire 12 around a cylindrical bobbin 11 housing a core. Such a magnetic field vector detector is well known, and detailed description thereof will be omitted. The joining end surfaces of the bobbin 11 and each spacer are each machined to an end surface precision that provides a predetermined degree of parallelism. Also,
The outer diameters of the bobbin 11 and each spacer are the same, and as shown in FIG. 3, grooves 111, 31, 41 are provided on their side surfaces so as to connect with each other. The same applies to other bobbins and spacers. One support rod 6 is fitted into each vertically continuous groove and screwed to each spacer. The support rod 6 aligns the magnetic field vector detector 1 and the spacer, and also prevents the magnetic field vector detector 1 from shifting in the circumferential direction. However, if only one support rod 6 is used, the magnetic field vector detector 1 will shift in the circumferential direction due to twisting. For this reason, referring to FIG. 3, three convex portions 32 are provided on the spacer 3 at intervals in the circumferential direction on the joint end surface of the bobbin 11 and the spacer.
Three recesses 112 are provided to fit into the recesses 112 to prevent displacement in the circumferential direction. Of course,
A convex portion may also be provided at the lower end of the upper spacer 4 similarly to the spacer 3.

Such an assembly is housed in a cylindrical cover 7 having the same inner diameter as the outer diameter of the bobbin 11 and each spacer, and the cover 7 is screwed to each spacer. The cover 7 also serves to improve the overall assembly strength, which is insufficient with the support rod 6 alone.

FIG. 4 is a diagram of the geomagnetic azimuth sensor viewed from above.

[Effect of idea]

As described above, according to the present invention, by improving the accuracy of orthogonality and parallelism of each magnetic field vector detector, the detection accuracy as a geomagnetic azimuth sensor can be improved.

[Brief explanation of the drawing]

Figure 1 is a diagram illustrating each component of the magnetic field vector detector in the case of a three-tier stacked geomagnetic direction sensor, Figure 2
The figure shows a partially cutaway structure of the three-tiered geomagnetic orientation sensor according to the present invention, Figure 3 shows an enlarged exploded perspective view of the main parts of Figure 2, and Figure 4 shows the implementation of Figure 2. Example top view. In the figure, 1 is a magnetic field vector detector, 2 is a base spacer, 3 and 4 are spacers, 5 is a top spacer, 6 is a support rod, and 7 is a cover.

Claims (1)

[Scope of utility model registration request] A geomagnetic azimuth sensor comprising a plurality of magnetic field vector detectors arranged at intervals in the vertical direction and each having a winding perpendicular to a bobbin containing a core.
The plurality of magnetic field vector detectors each having a substantially cylindrical bobbin finished to a predetermined end surface accuracy are sandwiched from above and below by spacers each finished to a predetermined end surface accuracy, and the direction of the winding is The approximately cylindrical bobbin and the spacer are arranged vertically in parallel in the same manner, grooves that are connected to each other are vertically provided on the side surfaces of the substantially cylindrical bobbin and the spacer, and support rods are attached to the grooves, and a cylindrical cover is provided. The earth's magnetic field is housed, and the joint end surface of at least one of the substantially cylindrical bobbin and the spacer is provided with a convex portion on one side and at least one concave portion that fits into the convex portion on the other side. Orientation sensor.