JPH03188315A - Mounting structure of magnetic azimuth sensor - Google Patents

Abstract

PURPOSE:To facilitate assembling by forming a fixing stand and a substrate into a fitting structure and fixing both of them through an annular packing. CONSTITUTION:In order to fix an magnetic azimuth sensor 11, the magnetic azimuth sensor 11 is fitted in the cylindrical recessed part of a fixing stand 12 to be fixed to said stand 12 and the protruding part 12a of the fixing stand 12 is inserted in the mounting hole 13a of the substrate 13 and the fixing stand 12 is rotated by predetermined quantity. By this method, the protruding parts of a mounting hole 13a and the protruding parts of an uneven part 12c are superposed one upon another. Continuously, an O-ring 15 composed of a material having elasticity such as a rubber material is interposed between the inclined surface 12b of the protruding part 12a and the substrate 13 to fix the fixing stand 2 to the substrate 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a magnetic first position sensor for mounting a magnetic direction sensor on a substrate.

[Prior art]

Conventionally, as a mounting structure for this type of magnetic direction sensor, the fifth
There were structures shown in Figures (A) and (B). The same figure (A
) is an overall perspective view, and (B) is a sectional view. In the figure, 1 is a magnetic direction sensor, and the magnetic direction sensor 1
is attached to a fixed base 2, and the fixed base 2 is further attached to a substrate 3.

The magnetic direction sensor 1 has a primary winding and a secondary winding 1 on a pobin core.
114 is wound. The fixing base 2 is made of rubber, and has a cylindrical recess into which the magnetic orientation sensor 1 is inserted at the top, and a projection shaped like a circular plate integrally formed at the top of a cylinder at the center of the outer surface of the bottom. 2a is provided. The dimension between the bottom outer surface of the fixing base 2 and the disk surface of the raised portion 2a is approximately equal to the thickness of the substrate 3 and the concave dimension.

When installing magnetic direction sensor 1, install magnetic direction sensor 1.
is inserted into the cylindrical recess of the fixing base 2, then the disc part of the protrusion 2a is compressed and inserted into the hole of the board 3, and the disc part of the protrusion 2a is inserted between the bottom outer surface of the fixing base 2 and the disc surface of the protrusion 2a. The fixing base 2 is fixed to the substrate 3 by sandwiching the substrate 3 and injecting an adhesive between the outer surface of the bottom part and the disk surface of the protrusion 2a.

[Problem to be solved by the invention]

However, in the conventional magnetic orientation sensor mounting structure described above, the disk portion of the rubber protrusion 2a is shortened and inserted into the hole of the substrate 3, and the gap between the outer surface of the bottom and the disk surface of the protrusion 2a is
There is a problem in that it takes time and effort to fix the fixing base 2 to the substrate 3 by injecting adhesive into the base plate.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a mounting structure for a magnetic azimuth sensor having a simple configuration that does not require much time and effort to fix the magnetic azimuth sensor.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a mounting structure for a magnetic orientation sensor in which the fixing base is made of a rigid insulating material, the bottom outer surface of the fixing base is formed into a flat surface that comes into contact with the substrate, and A protrusion with an uneven outer periphery is provided in the center, and the surface opposite to the bottom outer plane of the protrusion is an inclined surface that slopes downward toward the outside, and the distance between the inclined surface and the bottom plane is the shortest. The dimensions are approximately concave with the board thickness.
The board is provided with a mounting hole with an uneven periphery into which the protrusion of the fixing base can be inserted, and after the protrusion of the fixing base is inserted into the mounting hole of the board, the fixing base is placed in its place. It is characterized in that an annular packing such as an elastic O-ring is inserted between the inclined surface of the protrusion and the bottom plane by rotating the protrusion for a fixed amount.

[Effect]

By configuring the mounting structure of the magnetic orientation sensor as described above, after the magnetic orientation sensor is assembled into the fixed base, the protrusion of the fixed base is inserted into the mounting hole of the board, and the fixed base is rotated by a predetermined amount to remove the protrusion. The fixing base can be fixed to the board by simply inserting an annular gasket such as an elastic O-ring between the inclined surface of the part and the flat surface of the bottom. There is no need for the laborious work of inserting the part into a hole in the substrate or injecting adhesive between the outer surface of the bottom part and the disc surface of the projection part.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

The first VIA is a diagram showing the mounting structure of the magnetic orientation sensor of the present invention, where (A) is an external view and (B) is a sectional view thereof. In the figure, reference numeral 11 denotes a magnetic orientation sensor, and the magnetic orientation sensor 11 is attached to a fixed base 12, and the fixed base 12 is further attached to a substrate 13.

The magnetic orientation sensor 11 has a configuration in which a primary winding and a secondary winding 14 are wound around a bobbin core.

The fixing base 12 is made of a rigid material such as plastic, and has a cylindrical recess in which the magnetic orientation sensor 11 is fitted in the upper part, and the outer surface 12d of the bottom thereof is formed into a flat surface that comes into contact with the substrate 13. Further, a protrusion 12a having an uneven portion 12c formed on the outer periphery is provided approximately at the center thereof. Further, the surface of the protrusion 12a that faces the bottom outer plane is an inclined surface 12b that is downwardly inclined toward the outer periphery.
The shortest dimension between 2b and the bottom outer plane is approximately concave with the thickness of the substrate 13.

At the center of the substrate 13, there is provided an attachment hole 13a with an uneven surface around the periphery into which the uneven part 12c of the fixing base 12 can be inserted.

To fix the magnetic orientation sensor 11, first, insert the magnetic orientation sensor 11 into the cylindrical recess of the fixing base 12 and fix it.
After inserting the fixing base 12 into the mounting hole 13a of the substrate 3 of the projection 12a, the fixing base 12 is rotated by a predetermined amount (until the convex part of the uneven part 12c is at the position indicated by the dotted line A). As a result, the convex portion of the mounting hole 13a and the convex portion of the uneven portion 12c come to overlap. Next, the inclined surface 12b of the protrusion 12a and the substrate 13
An O-ring 1 made of an elastic material such as rubber material between
5 is inserted to fix the fixing base 2 to the substrate 3. As a result, the magnetic orientation sensor 11 is fixed to the substrate 13 via the fixing base 12.

By configuring the mounting structure of the magnetic orientation sensor as described above, the disc part of the protrusion 2a of the rubber fixing base 2 can be inserted into the mounting hole with a smaller diameter, as in the conventional case shown in FIG. Furthermore, there is no need to perform the time-consuming fixing work of injecting adhesive into the space 5 between the substrate 13 and the bottom outer surface of the fixing base 2.

FIG. 2 is a diagram showing the wiring configuration of the magnetic orientation sensor 11. As shown in the figure, one primary winding P and two secondary windings S, , S, are wired to a pobbin core BC. -The secondary winding P is wound so as to excite the pobbin core BC, and the two secondary windings S, , S, are wound so as to be orthogonal to each other. Therefore, when the secondary winding S produces an output proportional to sin α, the secondary winding S produces an output proportional to cos α.

FIG. 3 is a diagram showing the overall circuit configuration when magnetic orientation is extracted as phase information. In the figure, 31 is an oscillator, 32 is a driver, 33 is a bandpass filter for removing harmonic components, and 34 is a doubler for matching frequencies.

Further, RC is selected so that ω=1/RC. Here, if the output voltage of the secondary winding SI is VI, the output voltage of the secondary winding S is 2, and the output voltage of the RC circuit is V, as shown in FIG. 4(A), V, When is the maximum and ■ is the minimum,
(2) becomes 45°, V gradually decreases, (2) increases, and when VI and VI become at the same level, the angle becomes 90° as shown in FIG. 4(C).

That is, the phase rotates as shown in FIGS. 4(A) to 4(D).

〔Effect of the invention〕

As explained above, according to the present invention, after the magnetic orientation sensor is assembled into the fixed base, the protrusion of the fixed base is inserted into the mounting hole of the board, and the fixed base is rotated by a predetermined amount so that the inclined surface of the protrusion The magnetic orientation sensor can be fixed by simply inserting an elastic annular gasket between the base and the bottom plane, so it is possible to fix the magnetic orientation sensor by simply inserting a rubber protrusion into a hole in the board as in the conventional mounting structure. An excellent effect is obtained in that there is no need for the time-consuming work of injecting adhesive between the outer surface of the bottom and the disc surface of the protrusion.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the mounting structure of the magnetic orientation sensor of the present invention, in which (A) is an external view, (B) is a cross-sectional view, and (2) is a cross-sectional view.
The figure shows the wiring configuration of the magnetic orientation sensor, Figure 3 shows the overall circuit configuration when extracting the magnetic orientation as phase information, and Figures 4 (A) to (D) show the secondary circuit of the magnetic orientation sensor. A diagram showing the vectors of the voltages V + , V * of the winding SI r S 1 and the output voltage V, FIG. 5 is a diagram showing the mounting structure of a conventional magnetic orientation sensor, and FIG. 5 (A) is an overall perspective view. , the same figure (B) is a sectional view. In the figure, 11...magnetic direction sensor, 12...fixing base, 13...substrate, 14...primary and secondary windings, 15...O ring. v'4)

Claims (1)

[Claims] A magnetic orientation sensor formed by winding a primary winding and a secondary winding around a bobbin core is incorporated into a fixed base having a cylindrical recess into which the magnetic orientation sensor is inserted, and the magnetic orientation sensor is incorporated therein. In a mounting structure for a magnetic orientation sensor in which a lower part of a fixing base is fixed to a substrate, the fixing base is made of a rigid insulating material, and its outer bottom is formed to be a flat surface that comes into contact with the substrate, and furthermore, A protrusion with an uneven outer periphery is provided in the center, a surface of the protrusion facing the outer bottom plane is formed into an inclined surface that slopes downward toward the outside, and the protrusion of the fixing base is provided on the substrate. A mounting hole is provided with a concave and convex periphery into which the protrusion can be inserted, and after the protrusion of the fixing base is inserted into the mounting hole of the board, the fixing base is rotated by a predetermined amount so that the inclined surface of the protrusion 1. A mounting structure for a magnetic orientation sensor, characterized in that an elastic annular packing is inserted between the surface and the bottom plane.