JP2006308480A - Metal ball detection sensor and method of manufacturing coil used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal ball detection sensor capable of shielding a detection coil without adding extra members or other processes.
A detection hole 20 through which a metal sphere passes is provided in a main body case 1, and a detection coil 6 is disposed so as to surround the detection hole 20 inside the case, and when the metal sphere passes through the detection hole. A detection circuit including an oscillator for detecting a change that occurs is provided. The detection coil 6 is an air-core coil having no bobbin, and a shield coil 7 held at a predetermined voltage level is arranged so as to closely cover the outer peripheral side of the detection coil 6 which is the air-core coil. Is done. As a result, the detection coil 6 can be protected from radio signals and interference signals that cause malfunctions from the outside.
[Selection] Figure 1

Description

  The present invention relates to a metal ball detection sensor that detects the passage of a metal ball such as a pachinko ball, for example.

Conventionally, as a game ball detector used for detection of a metal body such as a pachinko ball, one described in Patent Document 1 has been proposed.
In the game ball detector described in Patent Document 1, a coil is provided along the inner peripheral surface of the passage hole, and a shield plate is disposed on the outer periphery of the coil so that the electromagnetic field in the passage hole is substantially uniform. Forming. Thereby, the detection characteristic of a game ball can be stabilized and a sensitivity can be made high, and also generation | occurrence | production of the electromagnetic field in a coil outer peripheral part can be suppressed by the base part and extension part of a shield board. As a result, even if a plurality of game ball detectors are arranged close to each other, mutual interference occurring between them can be prevented (see Patent Document 1 and FIG. 1).
JP 2002-122777 A

  However, as in the game ball detector described in Patent Document 1, when the shield plate is arranged by forming the base portion and the extension portion around the outside of the coil, the shield plate is formed in a three-dimensional shape. Since it is necessary to make a new press die for this purpose, the process becomes complicated and the manufacturing cost increases.

  Further, since a three-dimensional shield plate is added as a new member in addition to the main body, the coil, and the detection unit, there is a problem that an extra space is required for arrangement.

  Therefore, the present invention has an object to provide a metal ball detection sensor having a simple configuration and capable of shielding a detection coil without adding extra members or other processes, and a manufacturing method thereof. is there.

  In order to solve the above problems and achieve the object of the present invention, a metal ball detection sensor of the present invention is provided inside a case, and surrounds the through hole through which the metal ball passes and the inside of the case. And a detection circuit that detects that the metal sphere has passed through the through hole and a detection circuit that detects a change that occurs in the detection coil when the metal sphere has passed through the through hole. The detection coil is formed of an air-core coil that does not have a bobbin.

  Moreover, as a preferable form of this invention, the shield coil arrange | positioned at the outer peripheral side of a detection coil is provided, and also as a more preferable form, a shield coil is formed using a different type of wire from a detection coil. You can also.

  In addition, the coil used for the metal ball detection sensor of the present invention is fused by winding a detection coil arranged around the through hole through which the metal ball passes in advance while heating around the core. The detection coil winding fusion process, and the shield coil arranged directly or at a certain distance around the detection coil is wound continuously or separately while heating the detection coil winding fusion process. It is generated through a process of fusing and a process of removing the winding core from the detection coil.

  According to the present invention, since the shield coil is provided so as to closely cover the outer peripheral side of the detection coil of the air-core coil, the shield coil can be easily arranged. Furthermore, the shield effect of the detection coil can be obtained by using the same coil generation process as that of the detection coil of the air-core coil without providing other members. As a result, the detection coil can be protected from radio signals and interference signals that cause malfunctions from the outside.

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
FIG. 1 is a diagram showing a configuration of a pachinko ball passing sensor according to the present invention.
In FIG. 1, the pachinko ball passing sensor includes a main body case 1, a detection coil 6, a circuit board 8, and a sealing material 12.

  The main body case 1 has a bottom surface and side surfaces, and a hollow hole-forming portion 4 for forming the detection hole 20 and fitting the detection coil 6 is provided on the bottom surface of one end portion. In addition, the body case 1 is provided with a pair of protrusions 3 that protrude symmetrically inward on the side surface near the end of the hole forming portion 4. The main body case 1 is provided with a plurality of receiving portions 2 for fitting the circuit board 8 and the sealing material 12 around the inside of the side surface of the main body case 1. In addition, a connector 18 for inserting the jack 19 into the other end of the main body case 1, that is, the side of the end where the detection hole 20 is not provided, and electrically connecting the circuit board 8 is provided. A notch 5 for fitting is provided.

  The detection coil 6 is fixed around the hole 9 on the mounting surface side of the circuit board 8 so that the detection coil 6 and the circuit board 8 are electrically connected. A pair of notches 10 are provided on the side surface of the circuit board 8 so as to be fitted into the protrusion 3 of the main body case 1, and a notch 11 is provided on the side surface of the other end portion so as to be fitted into the connector 18. ing.

Electronic components and patterns constituting the detection circuit are arranged on the mounting surface side of the circuit board 8, and a ground pattern excluding an insulating layer or electronic components is formed on the non-mounting surface side.
The detection coil 6 and the detection circuit mounted on the circuit board 8 constitute a proximity sensor, an oscillation circuit including the detection coil 6 is formed, and a high-frequency electromagnetic field is generated around the detection coil 6. It is supposed to be formed. When the pachinko ball passes the high-frequency electromagnetic field, an eddy current flows through the pachinko ball, energy is consumed, and the Q of the detection coil 6 is reduced, so that the oscillation condition of the oscillation circuit is changed and the amplitude is reduced. The pachinko ball passing detection is performed by the change of the oscillation condition. The detection coil 6 is typically a hollow cylindrical air core coil formed without a bobbin.

Then, a shielding coil 7 is formed so as to cover the outer peripheral side of the air-core coil that is the detection coil 6, whereby the circuit board 8 is held at the ground voltage or a constant level voltage, and the detection coil 6 is Shielded.
Alternatively, the winding start end and the winding end end of the shield coil 7 may be connected so as to be in a so-called open state that is not connected to any voltage level. Thereby, a predetermined shielding effect can be obtained, and the degree of freedom in design can be expanded.

  Further, the detection coil 6 and the circuit board 8 fixed around the hole 9 on the mounting surface side are fitted into the hole forming portion 4 of the main body case 1. The fitting of the circuit board 8 into the main body case 1 is realized by fitting the notch 10 of the circuit board 8 into the protrusion 3 of the main body case 1 and fitting the periphery of the circuit board 8 into the receiving portion 2 of the main body case 1. The

  The sealing material 12 fitted into the main body case 1 so as to cover the circuit board 8 has a sealing surface 16 and an open surface 17, and is closely attached to the hole forming portion 4 of the main body case 1 at one end. Then, a hole 15 is formed so as to be fitted, and a concave portion 13 is formed on a side surface thereof so as to be fitted in close contact with the protrusion 3 of the main body case 1. Further, a recess 14 is formed on the side surface of the other end of the sealing material 12 and the sealing surface 16 so as to be fitted in close contact with the connector 18.

  As described above, the sealing surface 16 of the sealing material 12 is closely attached to the non-mounting surface side of the circuit board 8, and the hole 15 of the sealing material 12 is closely attached to the hole forming portion 4 of the main body case 1. ing. And the recessed part 13 of the sealing material 12 fits closely in the protrusion 3 of the main body case 1, and the recessed part 14 of the sealing material 12 fits in the connector 18 of the main body case 1, and it is comprised. Yes.

  Here, the sealing material 12 is a resin melted by heating, and for example, hot melt or the like is filled into the non-mounting surface side of the circuit board 8 fitted inside the main body case 1.

  Instead of pouring the sealing material 12 into the inside of the main body case 1, a mold corresponding to the sealing material 12 is used to mold the sealing material, and then the heat is removed to seal in a solid state. Good.

  As described above, the sealing material 12 is preferably colored, for example, black, but a colored transparent material may also be used. Moreover, as the sealing material 12, what contains resin is preferable, but it can also form using adhesives, such as an epoxy, a silicon | silicone, etc. besides that.

FIG. 2 is a central cross-sectional view of the pachinko ball passing sensor, that is, a cross section connecting the center of the hole forming portion 4 at one end of the main body case 1 to the center of the other end.
In FIG. 2, the detection coil 6 is disposed close to the bottom surface of the main body case 1 that becomes the pachinko ball inlet side 21 with one end fixed to the mounting surface side of the circuit board 8.

The sealing material 12 is formed so as to uniformly cover the non-mounting surface side of the circuit board 8 other than the detection hole 20 formed by the hole forming portion 4 at one end portion of the main body case 1 to the other end portion. ing.
The detection hole 20 is formed from the pachinko ball inlet side 21 to the pachinko ball outlet side 22 in the hollow of the hole forming portion 4 of the main body case 1.

FIG. 3 is an exploded perspective view of the pachinko ball passing sensor, and specifically, an exploded perspective view seen from the pachinko ball inlet side 21 of the main body case 1 shown in FIG.
In FIG. 3, on the mounting surface side of the circuit board 8, a shield coil 7 that holds the ground voltage of the circuit board 8 or a constant level voltage is provided so as to cover the detection coil 6. Both are pasted together.

  Thus, for example, when a ground pattern or a signal pattern having a constant voltage level is formed on the mounting surface side of the circuit board 8, the mounting surface is easily provided when the shielding coil 7 is provided so as to cover the detection coil 6. A ground voltage or a constant level voltage is obtained on the side.

  Further, the connection point connected to the shield coil 7 is not limited to the ground voltage or a constant level voltage, and is connected to the winding start end and the winding end end of the shield coil 7 and is not connected to any voltage level. It may be configured to be in a so-called open state.

4 is an external view of a pachinko ball passing sensor, FIG. 4A is a rear view, FIG. 4B is a side view, and FIG. 4C is a top view.
On the back surface of the pachinko ball passage sensor shown in FIG. 4A, the other end where the connector 18 is mounted from one end inside the main body case 1 (the portion excluding the detection hole 20 formed by the hole forming portion 4). The sealing material 12 is formed so as to cover evenly.

  A protrusion 3 is provided at the center of the main body case 1 on the side surface of the pachinko ball passing sensor shown in FIG. 4B. 4C, a detection hole 20 formed by the hole forming portion 4 is provided at one end of the main body case 1 on the top surface of the pachinko ball passage sensor shown in FIG. It has been. 4B and 4C, the connector 18 is attached to the other end.

FIG. 5 is a diagram illustrating a configuration of a shielding coil, and FIGS. 5A, 5B, 5C, and 5D illustrate configurations of different types of shielding coils.
As shown in FIG. 5A, after the coil is wound from the innermost start C1s to the outermost end C1e of the detection coil 6 to form the detection coil 6 of the air-core coil, the outer peripheral side of the detection coil 6 The shield coil 7 is formed by winding a coil from the innermost start C2s of the shield coil 7 to the outermost end C2e so as to be in close contact with and cover the detection coil 6.

The start C2s and end C2e of the shield coil 7 are connected to the ground voltage or a constant level voltage of the circuit board 8, and the start C1s and end C1e of the detection coil 6 are connected to the detection circuit of the circuit board 8. Formed. Then, the detection coil 6 and the shield coil 7 are bonded together on the mounting surface side of the circuit board 8 in an integral structure.
Thereby, it is not necessary to provide other members other than the coil, and the shield can be performed by the shield coil 7 integrated with the detection coil 6 with a simple configuration.

Alternatively, only the start C2s of the shield coil 7 may be connected to the ground voltage or a constant level voltage of the circuit board 8, and only the end C2e may be disconnected. As a result, the external signal caught by the end C2e by the antenna effect as well as the shield effect can easily flow in the start C2s direction.
Further, the connection point connected to the shield coil 7 is not limited to the ground voltage or a constant level voltage, and the winding start end (start C2s) and the winding end end (end C2e) of the shielding coil 7 are connected, You may comprise so-called an open state which is not connected to any voltage level.

  Further, as shown in FIG. 5B, the detection coil 6 is formed by forming a detection coil 6 of an air-core coil by using a normal coil wire, and is closely attached to the detection coil 6 on the outer peripheral side of the detection coil 6. As described above, the shield coil may be formed by using the mesh shield coil 51.

  Further, as shown in FIG. 5C, the detection coil 6 is formed of an air-core coil detection coil 6 using a normal coil wire, and is closely attached to the detection coil 6 on the outer peripheral side of the detection coil 6. Thus, the shield coil can be formed using the wire shield coil 52.

  Further, as shown in FIG. 5D, the shield coil 7 may be wound with a certain distance from the detection coil 6. In this case, in order to provide a certain distance, the shield coil 7 may be wound after the insulating tape 53 is wound around the detection coil 6. In addition to the insulating tape 53, if a certain distance can be provided between the detection coil 6 and the shield coil 7, another ring-shaped bobbin is provided around the detection coil 6. Further, the shield coil 7 may be wound, and a protrusion on the rib for positioning the shield coil 7 is provided on the main body case 1 side so that a certain distance is provided between the detection coil 6 and the shield coil 7. You may do it.

Thereby, according to the characteristic of the coil 6 for a detection, or according to an external signal, shapes, such as length and thickness of the coil 7 for a shield, and structures, such as a winding diameter and a wire, can be adjusted easily.
Then, the shield of the detection coil 6 can be shielded by adjusting the shield range of the shield coil 7 so as to coincide with the detection timing of the detection coil 6.

FIG. 6 is a diagram showing a method for manufacturing an air-core coil used in the metal ball detection sensor of the present invention.
In FIG. 6, first, in step A (detection coil winding / fusion step), the first coil 62 is wound around the core 61 by a predetermined number of turns from the start C1s to the end C1e of the first coil 62. The detection coil 6 is wound by being wound while being heated and fused 63.
The first coil 62 that winds the detection coil 6 is processed in advance so that the surface is solidified by heat fusion 63.

Then, in step B (shield coil winding / fusion step), the outer periphery of the heat-sealed detection coil 6 is closely attached to and covered with the detection coil 6. Then, the second coil 64 is wound in the opposite direction or the same direction as the detection coil 6 from the start C2s to the end C2e of the second coil 64 while heating and fusing 65 a predetermined number of turns around the detection coil 6. Then, the shield coil 7 is wound.
The second coil 64 for winding the shield coil 7 is processed in advance so that the surface is solidified by heat fusion 65.
Finally, although not shown, the winding core 61 is extracted from the inside of the detection coil 6, and the detection coil 6 and the shield coil 7 of the air-core coil are generated.

Further, the shield coil 7 is not limited to the direct arrangement around the detection coil 6, and the shield coil 7 may be arranged around the detection coil 6 with a certain distance. The detection coil winding / fusion process of the A process is not limited to the case of performing the shielding coil winding / fusion process of the B process continuously to the detection coil winding / fusion process of the A process. Separately, the shield coil winding and fusing process of the B process may be executed.
The connection point connected to the shield coil 7 is not limited to the ground voltage or a constant level voltage, but the winding start end (start C2s of the second coil 64) and the winding end end (second coil 64) of the shielding coil 7. May be configured to be in a so-called open state that is not connected to any voltage level.

As a result, the shield coil 7 is generated by being wound in the same coil generation process as that of the detection coil 6, so that it is not necessary to provide a special process for generating the shield coil 7.
Further, since the shield coil 7 is wound continuously or separately around the detection coil 6 and the core 61 is removed from the detection coil 6, the air core coil generation process is partially extended or separated. As a result, the shield coil 7 and the detection coil 6 can be integrally formed at a time.

  It should be noted that the present invention is not limited to the above-described embodiment of the present invention, and that the configuration can be appropriately changed without departing from the gist of the present invention described in the claims. Not even.

It is a figure which shows the structure of the pachinko ball passage sensor by this invention. It is a center sectional view of a pachinko ball passage sensor. It is a disassembled perspective view of a pachinko ball passage sensor. FIG. 4A is an external view of a pachinko ball passing sensor, FIG. 4A is a rear surface, FIG. 4B is a side surface, and FIG. 4C is an upper surface. It is a figure which shows the structure of the coil for shielding, FIG. 5A is a structure of the coil for shielding, FIG. 5B, FIG. 5C, and FIG. 5D are the structures of the other coil for shielding. It is a figure which shows the production | generation of an air-core coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body case, 2 ... Receiving part, 3 ... Protrusion, 4 ... Hole formation part, 5 ... Notch, 6 ... Coil for detection, 7 ... Coil for shielding, 8 ... Circuit board, 9 ... Hole, 10 ... Notch, 11 ... notches, 12 ... sealing material, 13 ... recesses, 14 ... recesses, 15 ... holes, 16 ... sealing surfaces, 17 ... open surfaces, 18 ... connectors, 19 ... jacks,

Claims (4)

A through hole provided inside the case and through which a metal ball passes;
A detection coil that is disposed so as to surround the through hole inside the case, and detects that the metal ball has passed through the through hole;
A metal ball detection sensor comprising a detection circuit for detecting a change occurring in the detection coil,
A metal ball detection sensor, wherein the detection coil is an air-core coil having no bobbin.   The metal ball detection sensor according to claim 1, further comprising a shield coil disposed on an outer peripheral side of the detection coil.   The metal ball detection sensor according to claim 1, wherein the shield coil is formed of a wire of a different type from the detection coil. A detection coil winding fusion process in which a detection coil arranged so as to surround a through-hole through which a metal ball passes is wound and fused in advance while heating around the core;
A step of performing fusion by winding a shield coil arranged directly or around the detection coil with a certain distance, while continuously or separately heating the detection coil winding fusion step; and
A step of removing the winding core from the detection coil, and a method of manufacturing a coil used for a metal ball detection sensor.

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