JP3019087B1 - Sphere detector - Google Patents

Abstract

An object of the present invention is to provide a low-cost sphere detection device having a mounting structure for accurately setting the positions of a sphere detection magnet and an MR element caused by a shape error. SOLUTION: A sphere detecting device 20 made of an epoxy resin.
Has a sphere passage hole 21 large enough to allow a sphere, which is a metal sphere, to pass through. In the vicinity of the sphere passage hole 21, there is provided a magnet installation recess 22, and the tablet is provided with the magnet 23 so that one surface of the tablet magnet 23 faces the side wall of the sphere passage hole 21 from the upper surface of the sphere detection device 20. can do. The tablet-shaped magnet 23
The protrusion 2 is formed on the side wall farther from the side wall of the sphere passage hole 21 so that the tip portion contacts the plane of the tablet magnet 23.
4 and 25 are provided in parallel with the insertion direction of the tablet magnet 23. The tablet magnet 23 is fixed by the protrusions 24 and 25 so as to be pressed down on the side wall of the magnet installation concave portion 22 and the side wall facing the side wall of the sphere passage hole 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sphere detecting device, and more particularly, to a sphere detecting device for detecting a metal sphere.

[0002]

2. Description of the Related Art Conventionally, a sphere detecting device of this type for detecting a sphere such as a pachinko ball has a sphere flow passage through which a sphere to be detected passes. Various sensors are provided in the sphere flow passage, and the number of spheres is counted by detecting the passing sphere. For example, there is a sphere detecting device in which an optical sensor is arranged such that a light emitting element and a light receiving element are respectively opposed to each other with a sphere flow path as a center, and the light receiving element detects light from the light emitting element blocked by a sphere passing therebetween. In addition, a light emitting element and a light receiving element are arranged in a predetermined relationship,
There is also a sphere detecting device that detects the passage of a sphere by causing a light receiving element to receive light reflected by the surface of the sphere passing through the sphere flow passage from light from the light emitting element. Further, there is a sphere detecting device in which a microswitch is provided in a sphere flow passage and a passing sphere is pressed to detect passage of the sphere. However, these sphere detection devices may erroneously detect dust or dirt other than the sphere as passing through the sphere,
There is a problem that the reliability is reduced due to the mechanical contact of the microswitch.

Therefore, attention has been paid to the fact that the sphere to be detected is a metal sphere, and a sphere detecting device has been proposed which aims to solve these disadvantages. In such a sphere detection device, a sphere flow path made of a non-magnetic material is provided, and a magnet is brought into contact with a side wall of the flow path,
The Hall element is arranged opposite to the magnet so as to receive the magnetic flux from the spherical flow passage. Then, the change in the magnetic field due to the passage of the sphere is detected by the Hall element arranged opposite to the magnet. A technique relating to a sphere detection device that detects the passage of a sphere by detecting a change in a magnetic field due to the passage of the sphere is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-251080.
It is disclosed in Japanese Patent Publication No. “Hard Sphere Detection Device”. Japanese Patent Application Laid-Open No. Hei 9-251080 discloses a technique in which the influence of an external magnetic field is eliminated by a magnetic shield formed by a magnetic path made of a magnetic material.

A sphere detecting device in which a magnetic shield is formed by a magnetic path made of such a magnetic material has a very high manufacturing cost in terms of specializing the material and complicating the shape. Therefore, a magnetic flux from a magnet is applied from the side wall of the spherical flow passage penetrating the non-magnetic plate, and the magnetic flux generated when the metal sphere passes through the spherical flow passage in opposition to the magnet is received so as to receive the magnetic flux generated only by the disturbance. There is one in which a magnetic detection element is arranged. In such a sphere detecting device, these magnets and magnetic detecting elements are fixed by enclosing them with a nonmagnetic epoxy resin. In this way, cost reduction is achieved not only by the material but also by its structure.

FIG. 7 schematically shows the configuration of a plane viewed from the top of a conventionally proposed sphere detecting device. The sphere detection device 10 made of epoxy resin has a sphere passage hole 11 having a circular cross section. This sphere passage hole 11
Is a size through which a sphere, which is a metal sphere, can pass, and the upper and lower surfaces of the sphere detection device shown in FIG. 7 penetrate. A metal sphere to be detected is passed through the sphere passage hole 11. In the vicinity of the sphere passage hole 11,
The magnet installation recess 12 has a substantially elliptical cross section. A tablet magnet 13 is installed in the magnet installation recess 12.

FIG. 8 shows the outline of the shape of the tablet magnet 13. FIG. 3A shows a planar shape when the tablet magnet 13 is viewed from above. FIG. 2B shows the shape of the tablet magnet 13 as viewed from the side. The tablet-type magnet 13 as is the circular shape when viewed from the top, on the side has a side surface portion 13 ₁ of the shape near the binding portion of the upper and lower control curved surface is cut away so that the plane ing. The magnetic flux is emitted from the vicinity of all the surfaces of the tablet magnet 13 in the direction of the normal vector of the surface. However, since most magnetic flux density of the central portion 13 around ₂ by the curved surface shape is high,
The magnetic flux emitted from this part is used for detecting a sphere. Hereinafter, both curved surfaces having the central portion will be referred to as magnetic flux supply surfaces. Also, by placing the side surface portion 13 ₁ in contact with the bottom surface of the magnet installation recess 12, one of the magnetic flux supply side can be opposite to the side wall of the sphere passing hole 11.

[0007] As shown in FIG. 7, in the magnet installation recess 12, one surface of the magnetic flux supply surface of the tablet magnet 13 from the upper surface of the sphere detection device 10 is opposed to the side wall of the sphere passage hole 11. It is installed perpendicular to the sphere detecting device 10. A magnetic flux 14 is emitted from a surface of the tablet magnet 13 installed in the magnet installation recess 12 facing the side wall of the sphere passage hole 11. When a sphere, which is a metal sphere, passes through the sphere passage hole 11, the magnetic field of the sphere passage hole 11 formed by the magnetic flux from the tablet magnet 13 changes. Therefore, a magnetic resistance (hereinafter referred to as M) is set at a position where the magnetic flux disturbed by the changed magnetic field reaches.
Abbreviated as R. ) The passage of a metal ball is detected by disposing the element.

The MR element is housed in a surface-mounted MR element package 15, and the electric resistance changes when magnetic flux reaches the MR element. Therefore, by detecting the change in the electric resistance, the change in the magnetic flux, that is, the passage of the metal ball can be detected. The MR element package 15 is surface-mounted on one surface of one end of a known flexible substrate 16. Flexible substrate 1
A connector (not shown) or the like is arranged at the other end of the surface of No. 6 where the MR element package 15 is not surface-mounted. A predetermined wiring is formed on the surface of the flexible substrate 16 up to a connector (not shown) connected to the other end so that the detection result of the MR element can be notified to an external sphere detection unit including a counter (not shown). The sphere detecting device 10 is provided with a groove 17 for vertically arranging the flexible substrate 16 so that the MR element surface-mounted is disposed facing the side wall of the sphere passage hole 11. The flexible substrate 16 is installed in the groove 17 in a state of being curved under a certain external force. In the groove 17,
A concave portion 18 is provided for the MR element package 15 to be brought into contact with the side wall of the groove 17 so as to be fixed by a restoring force that attempts to restore the external force applied when the flexible substrate 16 is bent. Is provided.

The tablet magnet 13 installed in the magnet installation recess 12, the flexible board 16 installed in the groove 17, and the MR element package 15 mounted on the surface thereof are fixed with epoxy resin, respectively. It is sealed so as to eliminate these gaps.

When a metal sphere to be detected does not pass through the sphere passage hole 11, only a magnetic flux 14 is emitted from one surface of the tablet magnet 13. Therefore, almost no magnetic flux reaches the MR element package 15 surface-mounted on the flexible substrate 16 provided in the groove 17 so as to face the side wall of the sphere passage hole 11. However, when the metal sphere passes through the sphere passage hole 11, a large amount of magnetic flux reaches the MR element by the magnetic flux 19 disturbed by the metal sphere. Therefore, the electric resistance decreases according to the magnetic flux detected by the MR element. This is flexible 1
The sphere, which is a metal sphere, is detected and counted by a sphere detection unit including a counter (not shown) electrically connected to the other end via a predetermined wiring disposed on the sphere 6.

[0011]

However, in the conventional sphere detecting device having the structure disclosed in Japanese Patent Application Laid-Open No. 9-251080, a material and a shape for forming a magnetic shield by a magnetic path made of a magnetic material are used. However, there is a problem that the cost is high due to the extremely complicated.

On the other hand, when the tablet magnet and the MR element are arranged in a predetermined relationship facing the side wall of the sphere passage hole as in the sphere detection device shown in FIG. In order to detect a sphere that passes through the sphere passage hole well, the MR element and the tablet magnet are installed so that the magnetic flux emitted from the tablet magnet reaches the MR element only when the metal sphere passes through the sphere passage hole. There must be.
However, when a low-cost tablet magnet is used, there is a case where the magnet itself is installed while being tilted due to a gap of the installation width of the tablet magnet due to a shape error between the magnet installation recess 12 and the magnet installed therein. In this case, the magnetic flux reaching the MR element from the installed tablet-type magnet does not meet the design, not only deteriorating the sensitivity of sphere detection, but also in some cases, the metal sphere itself cannot be detected. .

An object of the present invention is to provide a low-cost sphere detecting device having a mounting structure for accurately setting the positions of a sphere detecting magnet and an MR element caused by a shape error.

[0014]

According to the first aspect of the present invention, there are provided (a) a hole penetrating a non-magnetic plate, and (b) a non-magnetic plate.
A concave portion formed around the hole of the body plate;
In the pressed state, magnetic flux is applied to the hole through the side wall of the hole.
And (d) the flat surface faces the side wall of the hole.
Further protruding from multiple flat plates protruding from the side wall
Pressing means for pressing the magnet against the side wall of the concave portion,
(E) The magnet pressed by the pressing means
Metal spheres that pass through the holes of the applied magnetic flux.
And a magnetic flux detecting means for detecting the resulting change through the side wall of the hole .

[0015]

[0016]

[0017]

[0018]

That is, according to the first aspect of the present invention, a recess is formed around the hole passing through the non-magnetic plate, and the recess is pushed into the recess, and the plane projects from the side wall of the recess in opposition to the side wall of the hole. A magnetic flux is applied to the hole through the side wall of the hole by a magnet in a state where the magnet is further protruded from the plurality of flat plates provided and pressed against the side wall of the recess, and the magnetic flux generated by the metal sphere passing through the hole by the magnetic flux detecting means is detected. Change is detected. Thereby, even when the magnet is manufactured to be slightly larger than the concave portion, the flat thin wall is pressed at the time of its installation, so that this size can be absorbed and accommodated,
The passage of the metal sphere can be accurately detected in a fixed and stable state.

[0020] In a second aspect of the present invention, in the sphere detecting device according to claim 1, wherein the pressing means is provided so that its distal end portion in a direction perpendicular to the non-magnetic plate on the side wall of the recess is in contact with the magnet It is characterized by having.

In other words , according to the second aspect of the present invention, since the pressing means is provided on the side wall of the concave portion in such a manner that the front end portion comes into contact with the magnet in a direction perpendicular to the non-magnetic plate, the front end portion is set when the magnet is installed. The magnet can be pressed against the side wall of the concave portion and fixed while being cut or bent.

[0022] In the present invention of claim 3, wherein, in the sphere detecting device according to claim 1, wherein the pressing means is characterized by pressing the magnets on the side wall of the recess closer to the side wall of the hole.

According to the third aspect of the present invention, the magnet for applying the magnetic flux is pressed against the side wall of the concave portion closer to the side wall of the hole. In addition to improving the design accuracy of the installed position of the magnetic flux detecting element, the passage of the metal sphere can be detected with higher accuracy.

[0024] In a fourth aspect of the present invention is a sphere detecting device according to claim 1, wherein the magnet is a tablet magnet, one of the plane of the tablet <br/> magnet to face the side wall of the hole It is characterized by being installed.

That is, according to the fourth aspect of the present invention, since the tablet magnet is used, the cost of the sphere detecting device can be reduced, and the surface to which the magnetic flux of the tablet magnet is stably applied is formed by a hole. The sphere detecting device can be easily oriented in the direction of the part and can accurately detect the sphere.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows the appearance of a sphere detecting device according to an embodiment of the present invention. The non-magnetic flat plate sphere detecting device 20 made of epoxy resin has a sphere passing hole 21 which is a hole. The sphere passage hole 21 is large enough to allow a sphere, which is a metal sphere, to pass through, and has a circular cross section. The sphere, which is a metal sphere, can penetrate from the upper surface side to the lower surface side of the sphere detecting device 20 shown in FIG. In the vicinity of the sphere passage hole 21, there is provided a magnet installation concave portion 22 having an elliptical cross section and a concave portion for installing a magnet. In the magnet installation concave portion 22, a tablet magnet 23 can be installed from above the sphere detecting device 20 in FIG.

The tablet magnet 23 has the same shape as that shown in FIG. That is, the tablet-shaped magnet 23 has a circular shape when viewed from the top, but has a side surface portion cut out so that the vicinity of the connecting portion of the curved surface of the up-down contrast becomes flat. A magnetic flux is emitted from the vicinity of all the surfaces of the tablet magnet 23 in the direction of the normal vector of the surface. However, the magnetic flux density is highest near the center of the curved surface due to the curved surface shape, and the magnetic flux emitted from this portion is used for detecting a sphere. Hereinafter, both curved surfaces having the central portion will be referred to as magnetic flux supply surfaces. By installing the side surface portion so as to be in contact with the bottom surface of the magnet installation concave portion 22, one of the magnetic flux supply surfaces can be opposed to the side wall of the sphere passage hole 21.

In the side wall of the magnet installation recess 22, which is farther from the side wall of the sphere passage hole 21, the sharp tip in the vertical direction of the magnet installation recess 22 in FIG.
A protruding portion (not shown) is provided toward the side wall 1. In other words, the tip of this protruding portion is inserted into the spherical passage hole 2
The direction in which the magnet installation concave portion 22 is provided in the vertical direction in FIG. 1 toward the side wall 1 is the same as the insertion direction when the tablet magnet 23 is installed in the magnet installation concave portion 22.
Therefore, the tip portion of the projection comes into contact with one of the magnetic flux supply surfaces of the tablet magnet 23. The tablet magnet 23 is fixed in such a state that it is pressed against the side wall of the magnet installation recess 22 closer to the side wall of the sphere passage hole 21 by such a protrusion.

A magnetic flux is emitted from the magnetic flux supply surface closer to the side wall of the sphere passage hole 21 of the tablet magnet 23 installed in the magnet installation recess 22 in this way. When a sphere, which is a metal sphere, passes through the sphere passage hole 21, the sphere passage hole 21
The magnetic field formed by the magnetic flux generated from the magnetic flux supply surface located on the side wall side of the first electrode changes. Therefore, the MR element is arranged at a predetermined position where the magnetic flux disturbed by the change in the magnetic field reaches, and the passage of the metal sphere is detected. The position of the MR element is determined by the strength of the magnetic flux of the tablet magnet 23 and the diameter of the sphere passage hole.

The MR element is housed in a surface mount type MR element package 26, and the electric resistance changes when the magnetic flux reaches the MR element. Therefore, by detecting the change in the electric resistance, the change in the magnetic flux, that is, the passage of the metal ball can be detected. The MR element package 26 is surface-mounted on one surface of a known flexible substrate 27. Further, a connector (not shown) is arranged on the other end of the surface of the flexible substrate 27 opposite to the surface where the MR element package 26 is mounted. A predetermined wiring is formed on the surface of the flexible substrate 27 up to a connector (not shown) connected to the other end so that the detection result of the MR element can be notified to an external sphere detection unit including a counter (not shown). The sphere detecting device 20 is formed with a groove 28 for installing a flexible substrate 27 so that a surface-mounted MR element is arranged to face the side wall of the sphere passing hole 21. The groove 28 has such a width that the plane of the flexible board 27 having a predetermined thickness can be installed so as to face the side wall of the sphere passage hole 21, and from the end of the sphere detection device 20 to the vicinity of the side wall of the sphere passage hole 21. It is an elongated groove that extends to curve. The flexible substrate 27 is installed in the groove 28 in a state of being curved by receiving a constant external force. And it is fixed by the restoring force which tries to restore to the external force applied at the time of the installation. At this time, the MR element package 26 mounted on the flexible substrate 27 is provided with a concave portion 29 to be brought into contact with the side wall of the groove 28 in parallel with the side wall of the sphere passage hole 21.

As described above, the tablet-shaped magnet 23 installed in the magnet installation recess 22 and the groove 28
The flexible substrate 27 installed in parallel with the side wall of the device and the MR element package 26 mounted on the surface thereof are sealed with epoxy resin so as to eliminate these gaps.

FIG. 2 shows a sphere detecting device 20 in this embodiment.
Is a plane configuration viewed from above. As described above, the plate-shaped sphere detection device 20 has a sphere passage hole 21 that penetrates the upper surface and the lower surface of the plate, a magnet installation recess 22, and a recess 29 for fixing the MR element package.
And a groove 28 having However, the feature of the sphere detection device 20 in this embodiment is that the protrusion 2
4 and 25 are provided. These protrusions 2
4 and 25, the tip of the magnet installation recess 22 in the vertical direction in FIG. 1 is in contact with the magnetic flux supply surface of the tablet magnet 23 installed in the magnet installation recess 22 on the side wall inside the magnet installation recess 22. Is provided. Then, the tip of the side wall of the magnet installation concave portion 22 provided in the vertical direction in FIG.
The tablet magnet 23 is made of an epoxy resin or the like having a hardness such that the tablet magnet 23 is cut by an external force applied when the tablet magnet 23 is placed or is forcibly bent.

Normally, when the magnet installation recess 22 is formed, it is made slightly larger than the tablet magnet 23 to be installed in the recess. Therefore, the magnetic flux supply surface of the tablet magnet 23 conventionally installed is originally the spherical passage hole 21.
However, the tablet-shaped magnets 23 that are arranged are often inclined due to the formation of the recesses 22 having such a large size. With the installation with this inclination, the magnetic flux as designed cannot be applied to the side wall of the sphere passage hole 21. However, in the present embodiment, when the tablet magnet 23 is arranged in the magnet installation recess 22, the tip portion is parallel to the direction in which the tablet magnet 23 is inserted into the side wall far from the side wall of the sphere passage hole 21, and the tip portion is Protrusions 24 and 25 are provided so that the 23 magnetic flux supply surfaces are in contact with each other. And the projections 24, 2
The other magnetic flux supply surface of the tablet magnet 23 that is not in contact with the tip of the tablet 5 is in contact with the side wall of the magnet installation concave portion 22 that is closer to the side wall of the sphere passage hole 21.

This facilitates the installation of the tablet magnet 23 in the magnet installation recess 22 and the protrusions 24, 2
The portion of the tip 5 that contacts the tablet magnet 23 is shaved or the tip is bent, so that the tablet magnet 23 can be pressed against the side wall closer to the side wall of the sphere passage hole 21. . Therefore, as described above, the MR element installed in a state where the flexible substrate 27 is in contact with the concave portion 29 and is fixed is installed by the groove 28. Then, the tablet magnet 23 can also be fixed and installed at all times, and it is possible to arrange the magnet and the MR element accurately as designed, thereby preventing the conventional passage of a sphere from being undetectable. .

FIG. 3 shows the configuration of a cross section of the sphere detecting device shown in FIG. 2 taken along the line AA.
That is, the sphere detection device 20 in the present embodiment has the sphere passage hole 21. The sphere passage hole 21 penetrates from the upper surface to the lower surface of the sphere detection device 20 and allows the sphere of a metal sphere to be detected to pass through the sphere passage hole 21. The diameter of the sphere passage hole 21 is desirably larger than the sphere of the metal sphere to be detected, so as not to hinder the passage of the sphere, and as small as possible to improve the detection accuracy of the magnetic flux. In the vicinity of the sphere passage hole 21, a magnet installation recess 22 is provided. The tablet mounting magnet 22 can be installed in the magnet installation recess 22 such that one surface of the tablet magnet 23 faces the side wall 30 of the sphere passage hole 21. At that time, the sphere detecting device 20 is inserted from the upper surface side of the sphere detecting device 20 in FIG. A protruding portion 24 (25) is provided, the portion of which is in contact with the magnetic flux supply surface of the tablet magnet 23. Therefore, when the tablet magnet 23 is installed in the magnet installation recess 22, the projection 24 (25) provided on the side wall 30 of the magnet installation recess 22 opposite to the side wall 30 of the sphere passage hole 21 allows the tablet magnet 23 to be provided. Can be fixed in a state of being pressed against the side wall 30 of the sphere passing hole 21.

In the sphere detecting device according to the present embodiment in which the tablet magnet 23 is fixed as described above, when the metal sphere to be detected does not pass through the sphere passage hole 21, the magnetic flux of the tablet magnet 23 is Only one surface of the supply surface emits magnetic flux. Therefore, the sphere passage hole 21
The magnetic flux hardly reaches the MR element package 26 surface-mounted on the flexible substrate 27 provided in the groove 28 so as to face the side wall of. However, when the metal ball passes through the sphere passage hole 21, a large amount of magnetic flux reaches the MR element due to the magnetic flux disturbed by the metal ball. Therefore, the electric resistance decreases according to the magnetic flux detected by the MR element. Then, the flexible substrate 27
A sphere, which is a metal sphere, is detected and counted by a sphere detection unit including a counter (not shown) electrically connected to the other end of the plane via a predetermined wiring arranged on the plane.

FIG. 4 shows an outline of the principle configuration of the sphere detecting section of the sphere detecting device in this embodiment. That is, the sphere detecting device 40 includes an MR sensor 41 composed of an MR element, and converts a change in magnetic flux detected by passing through the sphere into a change in electric resistance. This MR sensor 41
The pulse generator 42 generates a pulse on the basis of the change in, and the pulse is counted by the counter 42. This allows
Each time the magnetic flux changes due to the passage of a sphere, the sphere to be detected can be counted as having passed.

Next, an example of a method of manufacturing the sphere detecting device in the present embodiment described above will be described.

FIG. 5 shows an outline of an assembling structure of the sphere detecting device in this embodiment. That is, it is molded with epoxy resin by a molding pattern that has been formed in advance and has the shape of the spherical passage hole 21, the magnet installation concave portion 22, the protruding portions 24 and 25, and the groove 28 as described above. In the formed pattern 50, the flexible substrate 27 on which the MR element package 26 is surface-mounted, and the tablet magnet 23 are provided in the groove 28 and the magnet installation recess 22, respectively. The flexible substrate 27 is bent by a predetermined external force 51, and the MR element package 26 whose side surface is mounted downward in FIG.
9 so as to be fixed to the groove 28. The tablet magnet 23 is installed in the magnet installation recess 22 with a predetermined weight. At that time, as described above, the portion that comes into contact with the tablet magnet 23 at the tip portions of the protrusions 24 and 25 is cut off,
Alternatively, the tablet-shaped magnet 23
Is pressed against and fixed to the side wall closer to the side wall of the sphere passage hole 21. After the flexible substrate 27 and the tablet magnet 23 are fixed and installed in this way, they are sealed again with epoxy resin.

Modification

In the sphere detecting device of this embodiment, the tip of the tablet magnet 23 is parallel to the direction of insertion of the tablet magnet 23 on the side wall of the magnet installation recess 22 and on the side wall far from the side wall of the sphere passage hole 21. Projecting portion 24 in contact with the magnetic flux supply surface of
25 were provided. On the other hand, the sphere detection device according to the present modification provides a structure that can increase the allowable range of the deviation of the size of the magnet when the tablet magnet 23 is manufactured.

FIG. 6 shows an outline of a planar configuration of the sphere detecting device according to the present modification as viewed from above. However, the same parts as those of the sphere detecting device according to the present embodiment shown in FIG. A different part from the sphere detecting device according to the present modification and the sphere detecting device according to the present embodiment shown in FIG. 2 is a magnet installation concave portion. Inside the magnet installation concave portion 52 in the present modified example, flat thin walls 53 and 54 project from the side wall of the magnet installation concave portion 52. On the surface of each of the thin walls 53 and 54 facing the tablet magnet 23, projections 24 and 25 are provided in parallel with the installation direction of the tablet magnet 23 so that the tip ends contact the magnetic flux supply surface of the tablet magnet 23. ing. Therefore, when the tablet magnet 23 is installed in the magnet installation recess 52, the contact surfaces of the protrusions 24 and 25 are shaved while the thin walls 53 and 54 are pushed outward, so that the tablet magnet 23 is more flexibly provided. 23 installations can be performed. As compared with the magnet installation concave portion 22 of the sphere detecting device in the present embodiment, it is possible to cope with a tablet magnet manufactured to be even larger.

In the sphere detecting device according to the present embodiment and the modified example, the tablet magnet 22 is fixed in a state where the tablet magnet 22 is pressed toward the side closer to the side wall of the sphere passage hole 21, but the invention is not limited to this. Not something. For example, a tablet-shaped magnet such as a side wall far from the side wall of the sphere passage hole 21 may be fixed in a pressed state. The point is that the tablet-shaped magnet 23 may be fixed in a state where the tablet-shaped magnet 23 is pressed against any of the side walls of the magnet installation concave portion at the time of installation. However, when it is necessary to finely adjust the strength of the magnetic flux generated by the magnet, the tablet-type magnet 22 is pressed in a direction closer to the side wall of the sphere passage hole 21 as in the present embodiment or in this modification. Fixing makes the design easier.

In the sphere detecting device according to the present embodiment and the modified example, the tablet-shaped magnet 23 is pressed by a protrusion provided in parallel with the installation direction so that the tip portion is in contact with the magnetic flux supply surface of the tablet-shaped magnet 23. However, the present invention is not limited to this. In addition, it is not necessary that the protrusion is provided on the side wall of the magnet installation concave portion. For example, a pressing body such as an elastic body may be used.

[0047]

As described above, according to the first aspect of the present invention, a magnet manufactured to be slightly larger than the recess is provided .
However, the flat thin wall is pressed during installation,
Can be accommodated by absorbing the size of the
It is possible to accurately detect the passage of a metal ball in a fixed state.
Wear.

[0048]

[0049]

According to the second aspect of the present invention, since the pressing means is provided on the side wall of the recess so that the tip portion comes into contact with the magnet in a direction perpendicular to the non-magnetic plate, the tip portion is set when the magnet is installed. The magnet can be pressed against the side wall of the concave portion and fixed in a state where the portion is cut or bent.

According to the third aspect of the present invention, the magnet for applying the magnetic flux is pressed against the side wall of the concave portion closer to the side wall of the hole. In addition to improving the design accuracy of the installation position of the magnetic flux detection element according to the above, the passage of the metal sphere can be detected with higher accuracy.

According to the fourth aspect of the present invention, since the tablet-type magnet is used, the cost of the sphere detecting device can be reduced, and the surface to which the magnetic flux of the tablet-type magnet can be stably applied is provided. In addition, the sphere detecting device can be easily oriented in the direction of the hole and can accurately detect the sphere.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an outline of a configuration of a sphere detecting device according to an embodiment.

FIG. 2 is a plan view illustrating an outline of a configuration of a sphere detecting device according to the present embodiment.

FIG. 3 is a cross-sectional view illustrating a configuration of a cross section taken along line AA of the sphere detection device according to the present embodiment.

FIG. 4 is a principle configuration diagram showing a principle configuration of sphere detection of the sphere detection device in the present embodiment.

FIG. 5 is an assembly diagram showing an outline of a configuration of a sphere detecting device in the present embodiment.

FIG. 6 is a plan view illustrating an outline of a configuration of a sphere detection device according to the present modification.

FIG. 7 is a plan view showing an outline of a configuration of a conventionally proposed sphere detecting device.

FIG. 8A is a plan view showing a planar shape of a tablet magnet. (B) It is a side view which shows the shape of the side surface of a tablet type magnet.

[Explanation of symbols]

 20, 40 Sphere detection device 21 Sphere passage hole 22 Magnet installation recess 23 Tablet magnet 24, 25 Projection 26 MR element package 27 Flexible board 28 Groove 29 Recess 30 Side wall 41 MR sensor 42 Pulse generator 43 Counter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63F 7/02 G01V 3/00 G01V 3/08

Claims (4)

(57) [Claims] 1. A hole penetrating a non-magnetic plate, a recess formed around the hole of the non-magnetic plate, and a side wall of the hole when pressed into the recess.
A magnet for applying a magnetic flux to the hole, and a magnet projecting from the side wall of the recess with a plane facing the side wall of the hole.
Projecting from a plurality of flat plates provided to
A pressing means for pressing the magnets on the side wall parts, in addition by the magnets being pressed by the pressing means
The magnetic sphere passing through the hole of the magnetic flux
A sphere detecting device, comprising: a magnetic flux detecting means for detecting a generated change through a side wall of the hole . 2. The pressure means is provided on a side wall of the recess.
The tip of the magnet plate perpendicular to the magnetic plate
2. The device according to claim 1, wherein the device is provided so as to be in contact with the device.
A sphere detection device as described in the above . 3. The method according to claim 1, wherein the pressing means is closer to a side wall of the hole.
Pressing the magnet against a side wall of the recess.
The sphere detecting device according to claim 1 . 4. The tablet according to claim 1, wherein the magnet is a tablet magnet.
One side of the mold magnet is installed facing the side wall of the hole.
The sphere detecting device according to claim 1, wherein