JP3140134B2 - Magnetic detector for pachinko machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic detector for a pachinko machine for stably and surely detecting an illegal act utilizing a magnet or the like in a pachinko game machine and preventing the act.

[0002]

2. Description of the Related Art As shown in FIG. 11, in a pachinko game machine, a player 200 moves a magnet 150 in front of a surface glass plate 102 of a pachinko machine 100, thereby causing a pachinko ball 110 to move.
There is a case where an illegal act of guiding the player to the winning hole 105 from the passage between the nails 104 is performed. In order to cope with this, generally, a magnetic detector 120 for detecting the magnetism of the magnet 150 is attached to the back side of the base plate 101 of the pachinko machine 100, and the magnetic detector 120 allows the surface glass plate 1 to be mounted.
02 is detected.

As shown in FIG. 12, a magnetic detector 120 is a printed circuit board 1 on which a magnetic sensor 124 is mounted inside a housing composed of a case 121 and a cover 122.
23 is attached. A cable 125 is connected to the substrate 123, and a detection output of the magnetic sensor 124 is taken out of the detector. Note that the magnetic detector 120 is
It is fixed to the base plate 101 through screws or the like through mounting holes 126 formed in the case 121.

[0004]

However, the pachinko machine 1
00 is very thick, and the distance from the back side of the base plate 101 on which the detector 120 is mounted to the passage of the pachinko ball 110 is 70 to 100 mm. On the other hand, the inner glass 103 and the surface glass plate 1
02 to the magnet 150 is 10 to 20 mm
And very short. Therefore, if a magnet having a magnetic force that is not detected by the magnetic detector 120 and having a weak magnetic force capable of sufficiently attracting the pachinko ball 110 with the magnetic force is used, the pachinko ball 110 can be attracted to the winning hole 105. Is possible, and fraud can work surprisingly easily.

As is generally known as a characteristic of a magnet, the strength of a magnetic field at an arbitrary point away from the magnet is inversely proportional to the square of the distance from the magnet. Significantly weaker. Based on this, FIG. 13 shows the principle of magnetic detection of the conventional magnetic detector 120. As can be seen from FIG.
Only a part of the magnetic field lines exiting from the N pole of 0 passes through the magnetic sensor 124, returns to the air again, and returns to the S pole. For this reason, the conventional magnetic detector can detect only a very small amount of magnetism, and can detect only when a very strong magnet is used or when the distance between the magnet and the detector is short. .

In the conventional detector, only a switching type Hall IC is used, and a relay or the like is operated by the output of the switching type Hall IC, or an analog output type Hall IC or a magnetoresistive element is combined with an electric circuit amplifier. Amplify the output, and operate the relay etc. with the amplified output,
It is configured to issue an alarm. For this reason, there is a problem that only a very strong magnet of a certain level or more can be detected, and even though the magnetic input is small, only the amplification factor is forcibly increased by the amplifier, and as a result, the ratio of the detection signal to the noise (S / N) is increased.
Ratio) becomes small, and a malfunction easily occurs.

Further, since a pachinko machine has a large number of winning holes in a relatively large space, it is not possible to increase the sensitivity due to the above-mentioned characteristics, that is, since it is not possible to further increase the sensitivity, a large number of magnetic detectors are installed on one pachinko machine. Otherwise, there is the disadvantage that the rate of fraud detection cannot be increased. Therefore,
An object of the present invention is to detect a magnet with a weak magnetic force over a wide range, and to increase the S / N ratio without increasing the amplification factor of an electric circuit, thereby achieving stable, reliable and reliable magnetic detection. To provide a magnetic detector capable of performing the following.

[0008]

In order to achieve the above object, a magnetic detector for a pachinko machine according to the present invention is provided with a pachinko machine.
Case that can be attached and detachably attached to this case
The housing is composed of a cover and a magnetic sensor.
The circuit board is supported by an inner wall of the housing , and a magnetic body provided in contact with the front or rear surface of the magnetic sensor or on both the front and rear surfaces is supported by the inner wall of the housing . In the magnetic detector of the present invention, the magnetic field lines of the magnet, that is, the magnetic flux, are configured to be concentrated on the magnetic sensor by the magnetic substance, so that the magnetic detection sensitivity is improved and the magnetic detection area is widened. Can be detected over a wide area even with a weak magnet. In addition to this,
Since many lines of magnetic force pass through the magnetic sensor, the S / S
The N ratio increases, and the stability, reliability, and reliability of magnetic detection increase.

It is desirable that the magnetic material used has as little remanence as possible and has high magnetic permeability. This will be additionally described with reference to FIG. As shown in FIG. 10, it is assumed that there is a magnetic detector in which bar-shaped magnetic materials A and B are arranged on both the front and rear surfaces of the magnetic sensor E. If cheating close to the base, the magnetic material a, B is magnetized, N ¹ pole to the magnet M side of the magnetic body a, S ^1-pole sensor E side, N ¹ to the sensor E side of the magnetic body B pole, S ¹ pole is magnetically induced respectively on the opposite side [see (a) of FIG. 10].

[0010] Here, the magnetic material A, remanence B is large, even remove the magnet M as shown in (b) of FIG. 10, the magnetized magnetic material A, N ¹ pole in B, S ¹ poles Will be done. In this state, as shown in (c) of FIG. 10, somewhat weaker magnets M ¹
Of the other cheating close the N ² pole is made, S ^3-pole magnet M ¹ side of the original if the magnetic material A, but it should N ³ pole is magnetically induced in the sensor E side, the magnet M ¹ is weaker than the previous magnet M, and the remaining N ¹ pole, S ¹ pole and S ³
Pole and N ³ pole are opposite polarities, so N ¹ pole, S ¹ pole and S ³ pole
Poles, are N ^3-pole cancellation, consequently will be the magnetic force of the magnet M ¹ is weakened by the difference only will not be entered less magnetic force lines in the magnetic sensor E, resulting in a malfunction.

Therefore, in order to perform magnetic detection with high stability, reliability, and reliability, it is preferable that the magnetic material has little residual magnetism and high magnetic permeability. Actually, it is necessary to further consider cost, and as the magnetic material satisfying these conditions, pure iron, silicon iron, and ferrite are exemplified.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic detector for a pachinko machine according to the present invention will be described based on embodiments. FIG. 1 is a sectional view of a main part of the embodiment. This magnetic detector 1 comprises a case 2 and a case 2
A housing is constituted by a cover 3 which can be attached and detached to and from the magnetic sensor 10 and both front and rear surfaces of the sensor 10.
A round bar-shaped front magnetic body 11 and a round bar-shaped rear magnetic body 12 provided in contact with the surface, and a printed circuit board 15 on which the magnetic sensor 10 is mounted are accommodated. Magnetic body 11
Is inserted into a cylindrical projection 2a protruding from the inner wall of the case 2, and the magnetic body 12 is inserted into a cylindrical projection 3a protruding from the inner wall of the cover 3. Magnetic body 11, 12
Are constantly pressed against the center of the magnetic sensor 10 on the substrate 15 by rubber spring members 4 and 5 as elastic members placed in the respective convex portions 2a and 3a. The substrate 1
5 is connected to a cable 16 having a function of extracting a detection signal of the magnetic sensor 10 to the outside of the detector, and a case 2 is provided with a mounting hole 6 for fixing the detector to the pachinko machine. .

In the magnetic detector 1 as described above, the spring members 4 and 5 for bringing the magnetic bodies 11 and 12 into contact with the magnetic sensor 10 play a very important role. That is, since the magnetic permeability of the magnetic material is several thousand times that of air, the magnetic sensor 10
When a gap is formed between the magnetic material 11 and the magnetic body 11, 12, a large magnetic loss is generated, but this is prevented by the spring members 4, 5. Therefore, the spring members 4 and 5 need not be made of rubber, but may be springs made of metal wires.

FIG. 2 shows an example of a magnetic measurement circuit mounted on the printed circuit board 15. This circuit is a general one using an analog output Hall IC 7. The output is a terminal for outputting the output voltage of the IC 7 which has responded to magnetism, and a DC voltmeter V for measuring the output voltage of the IC 7 is connected to this terminal. Further, resistors R ₁ and R ₂ for setting a bias current of the IC 7 are connected in series to the IC 7,
_cc indicates a positive electrode of the power supply to be applied, and GND indicates a negative electrode.

The magnetic detector 1 having such a structure is fixed to the back side of the base plate 101 of the pachinko machine 100 as shown in FIG. Next, the principle of magnetic detection of the detector 1 in the fixed state will be described with reference to FIG. When the magnet M approaches the front glass plate of the pachinko machine, the magnetic lines of force coming out of the N pole of the magnet M magnetize the magnetic bodies 11 and 12 by magnetic induction. An N-pole is generated on the sensor 10 side, an S-pole appears on the sensor 10 side of the magnetic body 12, and an N-pole appears on the opposite side. The lines of magnetic force from the magnet M are as illustrated.

Since the magnetic lines of force have the property of always shrinking, many lines of magnetic force maintain the attractive force while maintaining the N
Pole, magnetic body 11, magnetic sensor 10, magnetic body 12, in the air,
The S pole of the magnet M is reached in this order. Therefore, the magnetic bodies 11, 1
The magnetic field lines are guided to the sensor 10 in step 2, and a large number of magnetic field lines are concentrated on the magnetic sensor 10, so that the sensitivity of the magnetic detection is increased. Even if the distance between the detector and the magnet M is long, accurate detection is possible. In addition to this, the magnetism of a weak magnet existing in a wide range can be easily detected.

Another embodiment is shown in FIG. This magnetic detector 1 'is basically the same as the detector 1 shown in FIG. 1 except that the shape of the magnetic material is different, and the same components are denoted by the same reference numerals. That is, a magnetic sensor 10 and a front surface of the sensor 10 are provided in a housing formed by the case 2 and the cover 3.
Brought into contact with in the front magnetic body 21 which is provided, after the sensor 10
A rear magnetic body 22 provided in contact with the surface and a printed circuit board 15 on which the sensor 10 is mounted are provided. In this embodiment, the magnetic body 21 includes a disc-shaped portion 21a,
The magnetic body 22 has a round bar-like portion 21b vertically connected to the center of the disk-like portion 21a. Similarly, the round bar-shaped portion 21b is brought into contact with the magnetic sensor 10 by an annular spring member 4 interposed between the disc-shaped portion 21a and the inner wall of the case 2, and the magnetic body 22 is While being inserted into the convex part 3a, it is pressed against the sensor 10 by the spring material 5 put in the convex part 3a.

FIG. 8 shows the principle of magnetic detection of the magnetic detector 1 '.
Shown in According to the detection principle, the lines of magnetic force coming out of the N pole of the magnet M are concentrated on the point a of the disk-shaped portion 21a of the magnetic body 21 located parallel to the magnet M, and the S pole is generated at the point a. Then
Most N poles are generated at the point b of the round bar-shaped portion 21b of the magnetic body 21, and a slight N pole is generated at the point c of the disc-shaped portion 21a. Further, the N pole at point b of the round bar-shaped portion 21b is magnetized by magnetic induction to the S pole on the sensor 10 side of the magnetic body 22 and the N pole on the opposite side via the magnetic sensor 10, and the magnetic field is obtained in the same manner as described above. The lines of magnetic force concentrate on the sensor 10. For this reason, although it depends on the length of the round bar-shaped portion 21b of the magnetic body 21 and the length of the magnetic body 22, the length (diameter) ) Can be detected.

Next, FIGS. 4 to 6 show modified examples of the magnetic material provided in contact with the front surface or the rear surface of the magnetic sensor 10, or both the front surface and the rear surface . First, in FIG. 4A, a round bar-shaped magnetic body 31 is disposed only on the front surface of the magnetic sensor 10, and in FIG. 4B, a round bar-shaped magnetic body 41 is provided only on the rear surface of the sensor 10. It is arranged. Then, (c) of FIG.
As shown in the magnetic body 1 of the double-sided to a round rod-shaped sensor 10
1 and 12, which are the same as those incorporated in the magnetic detector 1 of FIG.

In FIG. 5A, the magnetic body 51 provided on the front surface of the magnetic sensor 10 has prismatic portions 51a and 51b.
And the prismatic portion 51a extends in a direction perpendicular to the portion 51b (vertical direction). The magnetic body 52 on the rear surface of the sensor 10 is also prismatic. In (b) of the same figure, as in (a), the magnetic body 61 on the front surface has prismatic portions 61a and 61b.
, But the prismatic portion 61a extends horizontally to the portion 61b. In (c) of the same figure, (a) and (b) are combined, and the magnetic body 71 on the front surface is composed of a cross-shaped portion 71a and a prismatic portion 71b.

In FIG. 6A, the magnetic body 81 on the front surface has a rhombus portion 81a having three prismatic portions extending radially at equal angular intervals (120 °). In (b) and (c) of the same figure, the magnetic body on the front surface is a planar body. That is, the magnetic body 91 shown in FIG.
The magnetic body 21 has a rectangular (square) portion 91a, and the one shown in (c) is the same as that used in the magnetic detector 1 'shown in FIG.

As is apparent from the principle of the detection sensitivity described above, there is a slight difference in the detection distance between these various magnetic materials. However, any magnetic material having an arbitrary shape may be used in consideration of the structure and space of the pachinko machine. Can be set freely.
For example, when the winning hole of the pachinko machine is located in the horizontal direction, the one shown in FIG. 5B is used, and when the winning hole is located in three directions, the one shown in FIG. 6A is used. By selecting a magnet in accordance with the detection direction, the magnetism of the magnet can be detected with higher stability and reliability with high efficiency.

[0023] Incidentally, in various magnetic body shown in FIGS. 4 to 6, structural, strength or increase the size, increasing the thickness is no problem is no magnetic material the front surface of the magnetic body and the rear surface Although a slight difference in sensitivity occurs even if the value is replaced, it can be used without any problem. However, in order for all of the collected magnetic force lines to enter the magnetic sensor, it is important to make the portion in contact with the magnetic sensor thinner in accordance with the magnetic sensing space of the sensor.

FIG. 9 shows the result of comparing the magnetic detection distance of the present invention with that of the prior art in order to clarify the effect of the magnetic detector of the present invention. The magnetism detection test was performed using a magnetism measurement circuit as shown in FIG.
The graph shows the distance from the magnetic detector 1 to the magnet when the Hall IC outputs a constant voltage when the same magnet is used. However, the curves (a) to (d) in the graph are the results obtained when the following magnetic detectors were used.

Curve (a): Conventional magnetic detector consisting only of magnetic sensor Curve (b): Magnetic sensor and 3 mm in diameter and 5 mm in length
Magnetic detector provided with a front magnetic body and a rear magnetic body having a diameter of 3 mm and a length of 14 mm [incorporating the one shown in FIG. 4C] Curve (c): Magnetic sensor, diameter of 3 mm, length of 14 mm
Detector provided with front and rear magnetic bodies (with built-in one shown in FIG. 4 (c)) Curve (d): Magnetic sensor and prismatic magnet with length × width = 3 × 3 mm and length 38 mm Body and diameter 3mm, length 14m
m, a front magnetic body made of a round bar-shaped magnetic body, a diameter of 3 mm,
A magnetic detector provided with a rear magnetic body having a length of 14 mm [FIG.
As shown in the graph of FIG. 9, the detection distance of the detector of the present invention is greatly extended and the detectable area is widened. However, magnetic detection can be performed with a high S / N ratio.

[0026]

As described above, the magnetic detector for a pachinko machine according to the present invention has a case mounted on a pachinko machine.
And a cover that is detachably attached to this case.
The body is configured, and the circuit board on which the magnetic sensor is mounted is the housing
The magnetic body supported by the inner wall of the housing and provided in contact with the front or rear surface of the magnetic sensor, or both the front and rear surfaces
Since it is supported by the inner wall, it has the following effects. (1) Since the magnetic detection range is wide and the sensitivity is high,
Even if cheating is performed using a weak magnet, the magnetism of that magnet can be reliably detected. (2) It is possible to monitor not only a wide area including a plurality of winning holes with a single magnetic detector, but also to perform a magnetic detection with a high S / N ratio and high stability, reliability and reliability. . (3) Simple structure and low cost. (4) Easy attachment / detachment to pachinko machines
You.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a magnetic detector according to one embodiment of the present invention.

FIG. 2 is a configuration diagram of a magnetic measurement circuit mounted on a magnetic detector.

FIG. 3 is a sectional view of a main part of a magnetic detector according to another embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a magnetic sensor and a magnetic body incorporated in the magnetic detector of the present invention.

FIG. 5 is a diagram showing another configuration of a magnetic sensor and a magnetic body incorporated in the magnetic detector of the present invention.

FIG. 6 is a diagram showing still another configuration of a magnetic sensor and a magnetic body incorporated in the magnetic detector of the present invention.

FIG. 7 is a diagram for explaining the principle of magnetic detection of the magnetic detector shown in FIG. 1;

8 is a diagram for explaining the principle of magnetic detection of the magnetic detector shown in FIG.

FIG. 9 is a graph showing a magnetic detection distance in the present invention and a conventional magnetic detector.

FIG. 10 is a diagram for explaining residual magnetism of a magnetic body.

FIG. 11 is a side view of a main part of a general pachinko machine.

FIG. 12 is a sectional view of a main part of a conventional general magnetic detector.

FIG. 13 is a diagram for explaining the principle of magnetic detection of a conventional magnetic detector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1 'Magnetic detector 2 Case 3 Cover 4, 5 Spring material (elastic member) 10 Magnetic sensor 11, 21 Front magnetic body 12, 22 Rear magnetic body 15 Printed circuit board

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63F 7/02 G01R 33/00-33/26

Claims (3)

(57) [Claims] And [claim 1] that is attached to the pachinko machine case, this
The housing is composed of a cover that is detachably attached to the case
The circuit board on which the magnetic sensor is mounted
A magnetic body supported and provided in contact with the front or rear surface of the magnetic sensor, or both the front and rear surfaces , is supported by the inner wall of the housing.
A magnetic detector for a pachinko machine characterized by being held . 2. A magnetic body provided on a front surface of the magnetic sensor.
Is a plane extending along the pachinko ball passing surface of the pachinko machine
Body or linear body or pachinko ball passing surface
The magnetic detector for a pachinko machine according to claim 1, wherein the magnetic detectors are radial bodies extending in different directions . 3. The magnetic body according to claim 1 , wherein the magnetic body and an inner wall of a housing are provided.
Is pressed against the magnetic sensor by the elastic member
Claim 1 or pachinko machines for magnetic detector according to claim 2, wherein to be.