JP2011128028A - Magnetic detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive magnetic detector capable of raising a detection sensitivity for illegal manipulation of a magnet to detect a weak magnetism with a high reliability, and setting the detection sensitivity higher in the front of the magnetic detector, or an illegal magnetism detecting direction, and setting the detection sensitivity lower in the rear than in the front so as not to easily detect a magnetism to be generated by magnetism generating parts such as a motor and a solenoid disposed in a Pachinko machine. <P>SOLUTION: A sensing printed circuit board 30 provided with a magnetic sensor S on the rear surface side is vertically mounted to the front side of a main printed circuit board 10, and a magnetic body FF having a projecting part F1 is mounted to the front surface side of the sensing printed circuit board 30. The projecting part F1 is inserted into a through hole 31 in the sensing printed circuit board 30 to come into contact with a magnetic sensing section on the mounting side of the magnetic sensor S. A magnetic body BF fixed to the main printed circuit board 10 comes into contact with a magnetic sensing section on the opposite side of the magnetic sensor S. The area of a facing surface on the front side of the magnetic body FF is greater than that of the magnetic body BF. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pachinko machine magnetic detector for monitoring a fraud using a magnet stably and over a wide area and preventing the fraud, particularly in a pachinko gaming machine.

  The pachinko machine displays a fun and beautiful video on a large display with a large display of approximately 400mm x 400mm, and a number of winning holes are provided. It is made possible by cashing the ball or making various game stories to entertain the player.

  However, recently, in order to obtain a large amount of prize money, the ball launched using a powerful neodymium magnet is guided directly into the winning opening, or the movement of the ball is stopped using the suction force of the magnet in the path of the launched ball. There are many frauds in which a sphere is fixed in a bunch of cocoons, and a ball that is fired later with this bunch of spheres is guided in an unnatural direction and many balls are put into the prize opening.

  For this reason, stand makers are trying to detect fraud by installing magnetic detectors on the back of the stand. A specific example of the pachinko machine on which the magnetic detector is installed is shown in FIG. FIG. 14 shows a state in which a ball guide nail 101 is driven into the board 100 of the pachinko machine and the ball P moves between the ball guide nails 101. On the front side of the board 100, a protection inner glass plate 111 and an outer glass plate 112 are provided with a passage space 115 for the sphere P, and the player brings the magnet M into contact with the outer glass plate 112 to make the sphere P Cheating in the direction intended.

  Since the pachinko machine maximizes playability and the beauty of the configuration is most important, the magnetic detector 120 is installed on the back side of the board 100.

  Therefore, there are two glass plates 111 and 112, a passage space 115 for the sphere P, and the thickness of the board 100 between the magnet M and the magnetic detector 120. Therefore, in a general pachinko machine, the magnet M and the magnetic detector are detected. The distance from the vessel 120 is a very large distance of 60 to 70 mm.

  However, since the magnetic flux density of the magnet M is attenuated by about the square of the distance, the magnetic flux density is very small at the position where the magnetic detector 120 is installed. For this reason, the detection sensitivity of the magnetic detector 120 is required to be very high.

  An example of a magnetic detector for such a demand is shown in FIG. 15 (outside perspective view) and FIG. 16 (internal structure perspective view). The magnetic detector 90 has a long shape and includes a long and thin case 91 and a connector 92 that emerges from the case 91. Inside the magnetic detector 90, a connector 92 is attached to one end of an elongated printed circuit board 95, and a notch 96 for attaching a reed switch 97 is formed along the long side of the printed circuit board 95. A switch 97 is disposed, and both terminals 98 thereof are soldered to the back surface of the printed circuit board 95 and are connected to the connector 92 by a back surface pattern.

  However, the reed switch 97 is configured to adsorb both ends of the magnetic metal wire constituting the reed switch 97 by the force of the magnetic force lines, and contact the contacts to output. Therefore, since there is a certain limit to bending metals with stress by magnetic attraction, when using the reed switch 97, a highly sensitive magnetic detector cannot be made.

  Further, the magnetic detector using the reed switch 97 has a drawback that it cannot perform electrical processing such as amplification because it is a mechanical action and not an electrical action.

  In addition, since the distance between the contacts of the reed switch 97 is extremely short, when a player hits the table during a pachinko game, the reed switch 97 easily vibrates and comes into contact with the magnetic detector using the reed switch. There are many defects that cause error operation accidents.

  As an example of another magnetic detector, as shown in FIG. 17 (internal structure perspective view), a magnetic sensor 131 is mounted on a printed circuit board 130, and the magnetic sensor 131 is connected to a connector 132 by a wiring pattern of the printed circuit board 130. There is what I did. However, considering that the detection sensitivity of the magnetic sensor is economical in the current technology, the detection magnetic flux density has a limit of about 1 mT (millitesla).

  In the case of this detection sensitivity of 1 mT, a magnet made of neodymium which is generally used illegally, having a surface magnetic flux density of 450 mT and a shape of 20 mm × 20 mm × N pole between the N pole and the S pole has a detection distance of Only about 80 mm can be secured. Actually, there are winning holes everywhere on the surface of the 400 mm × 400 mm board of the pachinko machine, but the monitoring area based on the detection distance is only about 30 mmφ on the surface of the outer glass plate 112 (see FIG. 14) in front of the magnetic detector. It cannot be secured. For this reason, in order to monitor the whole surface of a board, there exists a fault which requires many magnetic detectors.

  Furthermore, as another example of the magnetic detector, a case is configured by a case attached to a pachinko machine and a cover detachably attached to the case, and a circuit board on which the magnetic sensor is mounted is an inner wall of the case. There is a magnetic detector for a pachinko machine that is supported by the inner wall of the housing, and is supported by the inner wall of the housing. ).

Japanese Patent No. 3140134

  In the magnetic detector described in Patent Document 1, since the magnetic material is held in the casing (case), the number of man-hours for assembling the magnetic material is increased, and manpower is required, and the assembly requires a very long time. However, this has the disadvantage that the cost is very high.

  In addition, since the magnetic substance is held in the case, the structure is inevitably large, and it is difficult to secure the mounting part of the magnetic detector to the pachinko machine configured with a complicated mechanism. is there.

  Since many manufacturers have entered the pachinko industry, price competition is extremely fierce, specifications that require the use of many magnetic detectors are never adopted, and inexpensive and highly sensitive ones are required. Therefore, there is a high demand for a low-cost and small-sized magnetic detector.

  However, as the detection sensitivity of the magnetic detector is increased to meet such a demand, other problems have arisen. That is, many parts that generate magnetism such as motors and solenoids are used on the back surface of the pachinko machine. High-sensitivity magnetic detectors detect the magnetism generated from these magnetism generating components, increasing the risk of malfunction. For this reason, a high-sensitivity magnetic detector has a problem in reliability in use, and a situation in which it cannot be used on a table with a large amount of magnetism generated by parts of a specific manufacturer's pachinko machine.

  Therefore, the front of the magnetic detector that monitors the unauthorized operation using the magnet (in the direction of the outer glass plate 112 in FIG. 14) increases the detection sensitivity, and the rear of the magnetic detector having a magnetic generating part such as a motor or a solenoid is detected. There is a need to reduce sensitivity.

In view of such a situation, the present invention solves the problems of the conventional magnetic detector for monitoring unauthorized operation of a pachinko machine using a magnet,
B) Sensitive detection of weak magnets with high sensitivity for improperly operated magnets b) Reliable detection of weak magnetism b) High sensitivity at the front of the magnetic detector, which is the direction of illegal magnetism detection, and motor behind the pachinko machine It is an object of the present invention to provide a magnetic detector that realizes low cost by lowering the detection sensitivity from the front in order to make it difficult to detect magnetism generated by magnetism generating parts such as solenoids.

  In order to achieve the above object, a magnetic detector according to the present invention has a printed circuit board and a pair of opposed magnetic sensing parts for detecting magnetism input in a direction crossing the printed circuit board. A surface mount type magnetic sensor mounted on a printed circuit board toward the mounting surface of the magnetic sensor, and a pair of facing surfaces disposed on the front side in the magnetic detection direction of the magnetic sensor, and the input magnetism is formed by the pair of facing surfaces. A magnetic body that guides the magnetic sensor to one magnetic sensing portion of the magnetic sensor, and a pair of opposed surfaces that are disposed on the rear side in the magnetic detection direction of the magnetic sensor. A magnetic body that guides the magnetism emitted from the rear portion of the magnetic sensor, and the area of the front facing surface of the pair of facing surfaces of the front magnetic body is a pair of the rear magnetic body From the area of the facing surface on the front side of the facing surface And wherein the large.

  In the present invention, since the area of the front facing surface in the magnetic body on the front side in the magnetic detection direction of the magnetic sensor is larger than the area of the front facing surface in the rear magnetic body, the magnetic detection in front of the magnetic detector is High sensitivity and low back magnetic detection. As a result, when the magnetic detector of the present invention is applied to a pachinko machine, the magnetism of the magnet due to unauthorized operation can be detected with high sensitivity, and detection with low sensitivity to the magnetism of magnetized parts such as motors and solenoids can be performed. Become.

  In the present invention, as a more specific configuration, among the magnetic materials on the front side and the rear side, the magnetic material facing the magnetic sensor across the printed circuit board has an opposite surface on the side facing the magnetic sensor on the printed circuit board. The magnetic body arranged in contact and directly facing the magnetic sensor has a configuration in which the opposing surface facing the magnetic sensor is disposed in contact with the magnetic sensing part of the magnetic sensor.

  The reason for this configuration is to guide the input magnetism to one of the magnetic sensitive parts of the magnetic sensor as much as possible, and to efficiently guide the magnetism from the other magnetic sensitive part of the magnetic sensor to the rear.

  In that case, it is preferable that the front side and / or the rear side magnetic body has a convex part that faces the magnetic sensor on the opposite surface facing the magnetic sensor. As a result, when the magnetic material on the front side has a convex portion, the input magnetism tends to concentrate on one magnetic sensitive portion of the magnetic sensor, and when the magnetic material on the rear side has a convex portion, the other of the magnetic sensor The magnetism exiting the magnetic sensing part is easily guided to the rear of the magnetic sensor.

  When providing a convex portion on the facing surface of the magnetic body, when the magnetic body on the front side or the rear side faces the magnetic sensor with the printed circuit board sandwiched therebetween, the magnetic body protrudes on the facing surface on the side facing the magnetic sensor. The printed circuit board has an insertion hole for inserting the convex portion of the opposing surface of the magnetic body, and the convex portion is inserted into the insertion hole, so that the convex portion comes into contact with the magnetic sensitive portion of the magnetic sensor. It is good to constitute as follows.

  According to this configuration, when the front magnetic body faces the magnetic sensor across the printed circuit board, the convex portion of the facing surface of the front magnetic body passes through the insertion hole of the printed circuit board and becomes the magnetic sensing portion of the magnetic sensor. Since the contact is made, the input magnetism is concentrated on the magnetic sensing part of the magnetic sensor. Also, when the rear magnetic body faces the magnetic sensor across the printed circuit board, the convex portion of the opposite surface of the rear magnetic body contacts the magnetic sensitive part of the magnetic sensor through the insertion hole of the printed circuit board. Magnetism from the magnetic sensing part of the magnetic sensor is efficiently guided backward.

  As a specific shape of the magnetic body, the front magnetic body has a flat plate shape, and the rear magnetic body has a prismatic shape. If the front magnetic body is flat, the area of the front facing surface can be easily increased with a simple shape, and if the rear magnetic body is prismatic, the front facing surface Can be easily made smaller with a simpler shape than the area of the front facing surface of the front magnetic body. That is, the area of the front facing surface of the front magnetic body can be easily made larger than the area of the front facing surface of the rear magnetic body while both the magnetic bodies have simple shapes. .

  Furthermore, it is preferable that the front and rear magnetic bodies are made of manganese-based ferrite. In this regard, in order to make the magnetic detector inexpensive, it is necessary to use an inexpensive material for the magnetic material. In general, when a magnetic material gives a strong magnetism, it has residual magnetism even if the magnetism is removed. When a magnetic material having residual magnetism comes into close contact with the magnetic sensor, the magnetic sensor outputs a signal as if it had detected magnetism even though there was no magnetism depending on the degree of close contact.

  Also, if any residual magnetism remains in the magnetic material, when a magnet with a magnetic pole different from the polarity of the residual magnetism of the magnetic material approaches the magnetic material, the residual magnetism of the magnetic material and the magnetism of the magnet cancel each other. The detection distance of the magnet greatly decreases. Alternatively, when a magnet having the same magnetic pole as the residual magnetism of the magnetic material approaches the magnetic material, the magnetism of the magnet is added to the residual magnetism, and the detection distance of the magnetic detector becomes very long, causing malfunction.

  Therefore, it is particularly preferable to use manganese-based ferrite as the magnetic material, which is easy to process, inexpensive in material, and has very little residual magnetism. In addition, permalloy, pure iron, or the like may be used.

According to the present invention (invention of claim 1), the area of the front facing surface in the front magnetic body is larger than the area of the front facing surface in the rear magnetic body.
1) The detection sensitivity in front of the magnetic detector is high, and weak magnetism in the front can be detected with high reliability and high sensitivity.
2) High sensitivity to the magnetism in front of the magnetic detector and low sensitivity to the magnetism behind, so when applied to a pachinko machine, the magnetism of the magnet due to unauthorized operation can be detected with high sensitivity. The magnetism from the magnetic generating component is difficult to detect. Therefore, it has a high ability to monitor unauthorized operations and is resistant to noise.
3) It is inexpensive.
Can be provided.

  According to the second aspect of the present invention, the detection sensitivity of the input magnetism can be increased.

  According to invention of Claim 3, it can be made highly sensitive efficiently.

  According to the invention described in claim 4, it is possible to achieve a highly sensitive and highly sensitive effect very efficiently.

  According to the fifth aspect of the present invention, the area of the front facing surface of the front magnetic body is easier than the area of the front facing surface of the rear magnetic body, although both magnetic bodies have a simple shape. Can be large.

  According to the sixth aspect of the invention, higher quality and lower price can be achieved.

It is an external appearance perspective view of the magnetic detector which concerns on one Embodiment. It is the top view (a) which shows the internal structure of the magnetic detector, and the side view (b) seen from the arrow A of (a). FIG. 3A is a cross-sectional view taken along line BB in FIG. 2A, a cross-sectional view taken along line CC in FIG. 2B, and a cross-sectional view taken along line DD in the magnetic detector. It is the external appearance perspective view (a) which shows an example of the magnetic body of the front side in the magnetic detector, and the external appearance perspective view (b) which shows another example. It is the external appearance perspective view (a) which shows an example of the magnetic body of the back side in the magnetic detector, and the external appearance perspective view (b) which shows another example. It is the external appearance perspective view (a) which shows an example of the sensing printed circuit board with which a magnetic sensor is mounted in the magnetic detector, and the external appearance perspective view (b) which shows another example. It is an external appearance perspective view at the time of mounting a magnetic sensor on one surface (front surface) of the sensing printed board shown to (a) of FIG. It is an external appearance perspective view at the time of mounting a magnetic sensor on the other surface (rear surface) of the sensing printed board shown in FIG. The principal part expanded sectional view (a) which shows the example of a form of the magnetic body of the front side and back side at the time of using the sensing printed circuit board shown in FIG. 7, and the principal part expanded sectional view (b) which shows another example of a form. is there. The principal part expanded sectional view (a) which shows another example of a magnetic body of the front side at the time of using the sensing printed circuit board shown in FIG. 7, and a back side, and the principal part expanded sectional view which shows another example of a form (B). The principal part expanded sectional view (a) which shows the example of a form of the magnetic body of the front side and back side at the time of using the sensing printed circuit board shown in FIG. 8, and the principal part expanded sectional view (b) which shows another example of a form. is there. It is an external appearance perspective view which shows the main printed circuit board in the same magnetic detector. It is an external appearance perspective view which shows the case in the same magnetic detector. It is principal part sectional drawing of a pachinko machine. It is an external appearance perspective view of the magnetic detector which concerns on a prior art example. It is a perspective view which shows the internal structure of the magnetic detector of FIG. It is a perspective view which shows the internal structure of the magnetic detector which concerns on another prior art example.

  Hereinafter, the present invention will be described in more detail with reference to embodiments.

  A magnetic detector according to the embodiment is shown in FIGS. As shown in FIG. 1, the magnetic detector 1 includes a case 3 and a cover 4 attached to the case 3 by fitting to form the entire case 2, and a connection terminal 21 a is formed from one end of the case 2. A connector 20 having

  The inside of the housing 2 has a structure as shown in FIG. Here, the connector 20 is attached along the end of the rear short side of the rectangular main printed circuit board 10, and the lead terminal 21b is soldered to one surface (upper surface) of the main printed circuit board 10. The connector 20 is for exchanging the detected electrical signal with an external control circuit.

  A rear magnetic body BF is attached to the upper surface of the main printed circuit board 10. The magnetic body BF has a prismatic shape made of the manganese-based ferrite of the previous example, and is fixed to the main printed board 10 with, for example, the thermosetting resin. However, the portion of the magnetic body BF protruding from the rear short side of the main printed circuit board 10 is also fixed to the side surface of the connector 20. The reason why the magnetic body BF is long is that the length of the magnetic body BF should be as long as possible in order to increase the magnetic detection sensitivity.

  A sensing printed circuit board 30 is attached perpendicularly to the main printed circuit board 10 at the end of the front short side of the main printed circuit board 10. The sensing printed circuit board 30 is attached to the main printed circuit board 10 by soldering the connection terminals 22 a of the connectors 22 mounted on the printed circuit board 30 to the main printed circuit board 10. The connector 22 is for electrically connecting the sensing printed circuit board 30 and the main printed circuit board 10.

  In the sensing printed circuit board 30, the front magnetic body FF is attached to the front side in contact with the inner wall of the case 3, and the surface mount type magnetic sensor S is mounted on the rear side. The magnetic body FF has a flat plate shape made of the manganese-based ferrite of the previous example. As is clear from FIG. 2A, the front magnetic body FF, the magnetic sensor S, and the rear magnetic body BF are arranged so that their centers coincide on the same straight line. The magnetic sensor S is located in the notch 11 (see FIG. 12) of the main printed circuit board 10 so as not to hit the board 10.

  The magnetic sensor S has a pair of opposing magnetic sensing parts that detect magnetism input in a direction across the sensing printed board 30, and the magnetic sensing part is directed toward the mounting surface (here, the rear face) of the sensing printed board 30. It is a surface mount type mounted on the printed circuit board 30.

  The magnetic body FF on the front side is disposed on the front side in the magnetic detection direction of the magnetic sensor S and has a pair of opposed surfaces, and the input magnetism is transmitted to one of the magnetic sensitive portions of the magnetic sensor S by the pair of opposed surfaces. It is a guide. As shown in FIG. 4, the magnetic body FF is a flat plate having a pair of facing surfaces (planes) Fa and Fb. For convenience, the facing surface Fa corresponds to the front surface, and the facing surface Fb faces the magnetic sensor S. It corresponds to the rear surface. This magnetic body FF has two forms, one having a cylindrical convex portion F1 whose opposing surface Fb faces the magnetic sensor S (a) and one having no convex portion F1 (b). When the opposing surface Fb has the convex portion F1, the end surface Fb ′ of the convex portion F1 is the opposing end surface.

  Here, since the magnetic body FF faces the magnetic sensor S with the sensing printed circuit board 30 interposed therebetween, in order to concentrate the input magnetism on the magnetic sensing part of the magnetic sensor S, the opposite side facing the magnetic sensor S is opposed. It is what has the convex part F1 in the surface [(a) of FIG. 4]. Corresponding to this, the sensing printed circuit board 30 has an insertion hole 31 (see FIG. 6A) for inserting the convex portion F1 on the opposing surface of the magnetic body FF. The convex part F1 is in contact with the magnetic sensitive part of the magnetic sensor S by inserting the convex part F1 into the insertion hole 31.

  The magnetic body BF on the rear side is disposed on the rear side in the magnetic detection direction of the magnetic sensor S and has a pair of facing surfaces. The pair of facing surfaces generates magnetism from the other magnetic sensing portion of the magnetic sensor S. It is guided behind the magnetic sensor S. As shown in FIG. 5, the magnetic body BF has a prismatic shape having a pair of facing surfaces (planes) Ba and Bb. For convenience, the facing surface Ba corresponds to the front surface facing the magnetic sensor S, and the facing surface Bb. Corresponds to the rear surface. This magnetic body BF has two forms, one having a cylindrical convex portion B1 facing the magnetic sensor S on the opposing surface Ba (a) and one having no convex portion B1 (b). When the opposing surface Ba has the convex portion B1, the end surface Ba ′ of the convex portion B1 is the opposing end surface.

  Here, the magnetic body BF is one that does not have the convex portion B1 on the facing surface Ba [(b) of FIG. 5]. Further, since the magnetic body BF directly faces the magnetic sensor S, the facing surface Ba on the side facing the magnetic sensor S is in contact with the magnetic sensing part of the magnetic sensor S.

  In such a magnetic detector 1, the area of the front facing surface [the facing surface Fa in FIG. 4A] of the pair of facing surfaces of the magnetic body FF is the front side of the pair of facing surfaces of the magnetic body BF. It is a great feature that it is larger than the area of the opposing surface [the opposing surface Ba in FIG. Thereby, the magnetic detection in front of the magnetic detector 1 has high sensitivity, and the magnetic detection in the rear becomes low sensitivity.

  Therefore, when the magnetic detector 1 is installed on the back surface of the pachinko board 100 as shown in FIG. 14, the magnetism of the magnet M due to unauthorized operation can be detected with high sensitivity and is arranged behind the board 100. Detection is low in sensitivity to magnetism of magnetized parts such as motors and solenoids. Therefore, it has a high ability to monitor unauthorized operations and is resistant to noise.

  Moreover, in this magnetic detector 1, the convex portion F1 on the opposite surface of the magnetic body FF is in contact with the magnetic sensitive portion of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30, so that the input magnetism is caused by the convex portion F1. It is inputted in a concentrated manner to the magnetic sensing part of the magnetic sensor S, and the magnetic detection sensitivity can be increased very efficiently.

  Further, since the magnetic bodies FF and BF are both made of manganese-based ferrite, the magnetic body itself can be easily processed, the material is inexpensive, and the residual magnetism is extremely low. Can provide.

  In the embodiment described above, the sensing printed circuit board 30 has the insertion hole 31 into which the protruding part F1 is inserted in accordance with the magnetic body FF having the protruding part F1 on the facing surface Fb. 6 as shown in (a). The sensing printed board 30 has three through holes 32 for attaching the connector 22 in addition to the insertion hole 31.

  In addition, when it is not necessary to insert the convex part F1 of the magnetic body FF or the convex part B1 of the magnetic body BF, as shown in FIG. 6B, the sensing printed board 30 having no insertion hole 31 is used. .

  The magnetic sensor S is mounted on the sensing printed circuit board 30 at the position of the insertion hole 31 (or the corresponding position when there is no insertion hole 31). When the insertion hole 31 is provided, the magnetic sensor S is mounted at the position of the insertion hole 31 on the front surface side of the sensing printed board 30 as shown in FIG. 7, and the position of the insertion hole 31 on the rear side as shown in FIG. May be implemented.

  Accordingly, when the facing surface Fb of the magnetic body FF has or does not have the convex portion F1, the magnetic sensor S is disposed on the front surface side of the sensing printed board 30 or when the facing surface Ba of the magnetic body BF has or does not have the convex portion B1. There are various arrangement forms depending on the case of mounting on the rear side.

  Next, an example of the arrangement form will be described. FIG. 9A shows a case where the magnetic detection sensitivity may not be so high. The magnetic bodies FF and BF do not have the convex portions F1 and B1, and the magnetic sensor S is the sensing printed board 30. The case where it is mounted on the front side of is shown. In this case, the rear facing surface (the facing surface directly facing the magnetic sensor S) of the magnetic body FF is in contact with the magnetic sensing portion of the magnetic sensor S, and the front facing surface (the sensing printed board 30) of the magnetic body BF. (The opposite surface on the side facing the magnetic sensor) is in contact with the rear surface of the sensing printed circuit board 30.

  FIG. 9B shows a case where the magnetic body FF has the convex portion F1, the magnetic body BF does not have the convex portion B1, and the magnetic sensor S is mounted on the front side of the sensing printed board 30. Indicates. In this case, the convex portion F1 of the magnetic body FF is in contact with the magnetic sensing portion of the magnetic sensor S, and the front facing surface of the magnetic body BF is in contact with the rear surface of the sensing printed board 30.

  10A, the magnetic body FF does not have the convex portion F1, the magnetic body BF has the convex portion B1, and the magnetic sensor S is mounted on the front side of the sensing printed circuit board 30. Indicates the case. In this case, the opposing surface on the rear side of the magnetic body FF is in contact with the magnetic sensing portion of the magnetic sensor S, and the convex portion B1 of the magnetic body BF is in contact with the magnetic sensing portion of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30. is doing.

  FIG. 10B shows a case where the magnetic body FF has the convex portion F1, the magnetic body BF also has the convex portion B1, and the magnetic sensor S is mounted on the front side of the sensing printed circuit board 30. Show. In this case, the convex part F1 of the magnetic body FF contacts the magnetic sensitive part of the magnetic sensor S, and the convex part B1 of the magnetic substance BF contacts the magnetic sensitive part of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30. Yes.

  FIG. 11A shows a case where the magnetic bodies FF and BF do not have the convex portions F1 and B1, and the magnetic sensor S is mounted on the rear surface side of the sensing printed board 30. FIG. In this case, the rear facing surface of the magnetic body FF is in contact with the front surface of the sensing printed board 30, and the front facing surface of the magnetic body BF is in contact with the magnetic sensing portion of the magnetic sensor S.

  In FIG. 11B, the magnetic body FF has the convex portion F1, the magnetic body BF does not have the convex portion B1, and the magnetic sensor S is mounted on the rear surface side of the sensing printed board 30. Indicates the case. In this case, the convex part F1 of the magnetic body FF comes into contact with the magnetic sensitive part of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30, and the front facing surface of the magnetic substance BF comes into contact with the magnetic sensitive part of the magnetic sensor S. ing.

  As is apparent from FIGS. 9 to 10, when the magnetic sensor S is mounted on the front surface side of the sensing printed board 30, the magnetic body FF has a magnetic sensing portion of the magnetic sensor S regardless of the presence or absence of the convex portion F1. Can be contacted. When the magnetic body BF is brought into contact with the magnetic sensitive part of the magnetic sensor S, the convex part B1 is provided on the facing surface Ba, and the convex part B1 is brought into contact with the magnetic sensitive part of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30. You can do it.

  Further, as apparent from FIG. 11, when the magnetic sensor S is mounted on the rear surface side of the sensing printed board 30, when the magnetic body FF is brought into contact with the magnetic sensitive part of the magnetic sensor S, the opposing surface Fb is provided. The convex portion F <b> 1 may be provided and the convex portion F <b> 1 may be brought into contact with the magnetic sensitive portion of the magnetic sensor S through the insertion hole 31 of the sensing printed board 30. The magnetic body BF can bring the facing surface Ba into contact with the magnetic sensing part of the magnetic sensor S as it is.

  Incidentally, the magnetic detector configured as shown in FIGS. 9 to 11 is exposed to a strong magnetism of several hundred mT. On the other hand, most magnetic materials become remanent when exposed to such a large magnetism. As described above, a magnetic sensor with a very high sensitivity remains in operation when the magnetic substance in the sensor has residual magnetism. That is, even though there is no unauthorized operation, the magnetic detector remains outputting the magnetic detection signal, which is a big problem. Moreover, in the case of the magnetic body FF provided with the convex portion F1 (FIG. 4A) and the magnetic body BF provided with the convex portion B1 (FIG. 5A), a magnetic body having a complicated shape must be made. I must.

  Therefore, manganese-based ferrite is used as the magnetic material, and the magnetic material is manufactured by forming the ferrite, so that the magnetic material is inexpensive and has little residual magnetism.

  The magnetic detector 1 as described above can be assembled, for example, as follows. As an example, it is assumed that the magnetic body FF in FIG. 4A, the magnetic body BF in FIG. 5B, and the sensing printed board 30 in FIG. 6A are used. In this case, the magnetic body FF is attached to the front surface side of the insertion hole 31 of the sensing printed circuit board 30 by inserting the convex portion F1 of the magnetic body FF into the insertion hole 31 from the front surface side of the sensing printed circuit board 30 together with the adhesive. The magnetic sensor S is mounted on the rear surface side of the insertion hole 31 of the printed board 30. Further, the connection terminals 22b of the connector 22 (see FIG. 2A) are inserted into the three through holes 32 of the sensing printed board 30 and mounted. Thus, the sensing printed circuit board 30 as shown in FIG. 8 is obtained (however, the magnetic body FF is not shown in FIG. 8).

  In the main printed circuit board 10, as shown in FIG. 12, the connection terminal 22a of the connector 22 in the sensing printed circuit board 30 is inserted into the three through holes 15 of the main printed circuit board 10 and soldered, whereby the sensing printed circuit board 30 is It is attached perpendicular to the main printed circuit board 10. At this time, the magnetic sensor S is located in the notch 11 of the main printed circuit board 10 (see FIG. 2A).

  Although not specifically shown in FIG. 12, the main printed circuit board 10 includes a transistor that amplifies the signal of the magnetic sensor S of the sensing printed circuit board 30 and outputs a power signal, and a power supply voltage applied to the magnetic sensor S. A constant voltage circuit or the like that keeps constant is mounted. Further, the lead terminal 21 b of the connector 20 is soldered to the wiring pattern 16 of the main printed board 10.

  Next, the magnetic body BF is fixed to a predetermined position of the main printed circuit board 10 with an adhesive (for example, an epoxy thermosetting adhesive) corresponding to the magnetic sensor S of the sensing printed circuit board 30 attached to the main printed circuit board 10. At that time, the magnetic body BF is positioned so that the front facing surface of the magnetic body BF is in contact with the magnetic sensing part of the magnetic sensor S.

  Subsequently, the main printed circuit board 10 configured as described above is accommodated in the case 3 as shown in FIG. 13, and the cover 4 (see FIG. 1) is attached to the case 3 by fitting, thereby The magnetic detector 1 in which the connection terminal 21a of the connector 20 appears from the notch 3a of the case 3 is completed (see FIG. 1).

  As described above, the magnetic detector of the present invention has various forms as shown in FIGS. 9 to 11. The reason why such a form is adopted will be described below.

  Since the magnetically sensitive part of a commercially available general magnetic sensor has a diameter of approximately 0.3 to 0.5 mm, a highly sensitive magnetic detector cannot be made unless the magnetism is concentrated and applied to the magnetically sensitive part. Therefore, when the convex portion F1 is provided on the magnetic body FF on the front side, the area of the rear facing surface (opposing end surface of the convex portion F1) of the magnetic body FF is significantly smaller than the area of the front facing surface. In particular, by bringing the convex portion F1 into contact with the magnetic sensing portion of the magnetic sensor S, the input magnetism is concentrated and input to the magnetic sensor S, and as a result, a highly efficient and highly sensitive magnetic detector can be obtained. it can.

  In this case, either the magnetic body FF or the magnetic body BF can be easily brought into contact with and attached to the magnetic sensing part on one side (the side opposite to the mounting side) of the magnetic sensor S provided on the sensing printed board 30. However, since the sensing printed circuit board 30 is provided on the magnetic sensing part on the mounting side of the magnetic sensor S, the magnetic body FF or the magnetic substance BF cannot be attached in contact with the magnetic sensing part of the magnetic sensor S.

  Unless the magnetic body FF or BF is attached to the magnetic sensor S, the magnetism collected by the magnetic body FF is dispersed in the non-magnetic sensing printed circuit board 30 and only a part of the magnetism is detected by the magnetic sensor S. It is not input to the department.

  In this case, the rate at which the magnetism collected by the magnetic body FF is input to the magnetic sensor S decreases as the thickness of the sensing printed circuit board 30 increases, and the magnetic detection sensitivity significantly decreases.

  In order to prevent these problems, by forming an insertion hole 31 for inserting the convex portion F1 of the magnetic body FF or the convex portion B1 of the magnetic body BF at the mounting position of the magnetic sensor S on the sensing printed board 30, the magnetic The convex part F1 or B1 can be brought into contact with the magnetic sensitive part of the sensor S.

For example, a part of the data when configured as shown in FIG.
The conditions are as follows.

・ Detection magnet (illegal magnet): 20 mm (vertical) x 20 mm (horizontal), S / N pole thickness 10 m
m, (Neodymium magnet, surface magnetic flux density 450mT)
Magnetic body FF: 3.5 mm (vertical) x 3.5 mm (horizontal) x 1.6 mm (thickness)
(Ferrite)
Magnetic body BF: 1.1 mm (length) x 1.1 mm (width) x 15 mm (length)
(Ferrite)
Magnetic sensor S: Detection sensitivity 1.8mT
Data of detected magnetic flux values on the detection surface of the magnetic detector when magnetic detection is performed under various conditions with the above constants are shown.
1) Without magnetic body FF and magnetic body BF, only magnetic sensor S 1.8 mT
2) When the magnetic body FF and the magnetic body BF are provided, and the magnet is brought close to the front of the magnetic detector 0.193 mT
3) When the magnetic body FF and the magnetic body BF are provided, and the magnet is brought close to the rear of the magnetic detector 0.267 mT
It becomes.

  When the magnetic sensor S with a detection sensitivity of 1.8 mT is used as it is, the detection sensitivity is 1.8 mT as it is, but by attaching a magnetic substance FF and a magnetic substance BF made of only a few millimeters of size, it is about 9 It shows that a magnetic detection sensitivity of 3 times can be obtained.

  Further, it is shown that the magnetic detection sensitivity from the rear of the magnetic detector can be reduced by about 36% with respect to the magnetic detection sensitivity from the front.

  This means that with respect to magnetism input from the surface of the pachinko machine, it is possible to monitor the illegal operation by the magnet with a detection sensitivity of about 9.3 times the detection sensitivity of a normal magnetic detector, and the back of the pachinko machine. For the magnetism generated by the electromagnetic equipment used in the above, it indicates that malfunction does not occur unless 1.36 times the magnetism input from the front is input.

DESCRIPTION OF SYMBOLS 1 Magnetic detector 2 Case 3 Case 4 Cover 10 Main printed circuit board 30 Sensing printed circuit board 31 Insertion hole S Magnetic sensor FF Front side magnetic body F1 Convex part Fa Front facing surface Fb Rear facing surface BF Rear side magnetism Body B1 Protrusion Ba Front facing surface Bb Rear facing surface M Magnet

Claims (6)

A surface-mount type that has a printed circuit board and a pair of opposing magnetic sensitive parts that detect magnetism input in a direction crossing the printed circuit board, and is mounted on the printed circuit board with the magnetic sensitive part facing the mounting surface of the printed circuit board A magnetic sensor, a magnetic body disposed on the front side in the magnetic detection direction of the magnetic sensor and having a pair of opposing surfaces, and the pair of opposing surfaces guides the input magnetism to one of the magnetic sensing parts of the magnetic sensor; A magnetic body disposed on the rear side in the magnetic detection direction of the sensor and having a pair of opposing surfaces, and the pair of opposing surfaces guides the magnetism emitted from the other magnetic sensing portion of the magnetic sensor to the rear of the magnetic sensor. A magnetic detector,
The magnetic detection characterized in that the area of the front facing surface of the pair of facing surfaces of the front magnetic body is larger than the area of the front facing surface of the pair of facing surfaces of the rear magnetic body. vessel.   Of the magnetic materials on the front side and the rear side, the magnetic material facing the magnetic sensor across the printed circuit board is disposed so that the facing surface facing the magnetic sensor is in contact with the printed circuit board and directly faces the magnetic sensor. The magnetic detector according to claim 1, wherein the magnetic body is arranged so that a facing surface facing the magnetic sensor is in contact with a magnetic sensing portion of the magnetic sensor.   3. The magnetism according to claim 1, wherein the front side and / or the rear side magnetic body has a convex portion facing a magnetic sensor on an opposing surface facing the magnetic sensor. Detector.   When the front or rear magnetic body faces the magnetic sensor across the printed circuit board, the magnetic body has a convex portion on the opposite surface on the side facing the magnetic sensor, and the printed circuit board is the magnetic body. 4. The magnetism according to claim 3, further comprising an insertion hole for inserting a convex portion on the opposite surface of the magnetic sensor, wherein the convex portion is inserted into the insertion hole so that the convex portion comes into contact with the magnetic sensing portion of the magnetic sensor. Detector.   5. The magnetic detector according to claim 1, wherein the magnetic material on the front side has a flat plate shape, and the magnetic material on the rear side has a prism shape.   6. The magnetic detector according to claim 1, 2, 3, 4, or 5, wherein the front and rear magnetic bodies are made of manganese-based ferrite.

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