JPH0758327B2 - Magnetic proximity sensor - 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 substance proximity sensor for detecting an approach of a magnetic substance as an electric signal.

[0002]

2. Description of the Related Art A magnetic proximity sensor, which has been conventionally used for electrically detecting that a pachinko ball is approaching in a pachinko game machine or the like, is equipped with an oscillation circuit using a high frequency coil. A general method is to take out a change in the oscillation frequency or a disturbance in the oscillation condition that occurs when a ferromagnetic material such as a pachinko ball approaches and output it as an electric signal.

However, the above-mentioned oscillation type sensor has a drawback that a very complicated circuit is required to increase the detection sensitivity and the manufacturing cost becomes high, and there is a problem that there are restrictions on the material of the coil mounting portion. there were. Therefore, in the case of limited conditions from the past, an optical sensor consisting of a light emitter and a light receiver is also used.In the case of an optical sensor, although it has the advantage that the detection distance can be lengthened with a relatively simple circuit, There was a problem in that there were restrictions on environmental conditions, such as that there could be nothing that could block light between the sensors. Further, the biggest problem of the conventional method is that, in any of the above cases, a signal amplifier circuit is required, so that the manufacturing cost is high and the operating power supply is always required, and thus the use condition is restricted.

[0004]

SUMMARY OF THE INVENTION A magnetic proximity sensor according to the present invention is intended to solve the above-mentioned problems, and a permanent magnet is fixed to one end of a movable plate which is swingably supported like a seesaw and the other. the weight to weight and balance of the permanent magnet on the end provided provided a weak spring which urges the beat movable plate to the weight-side or a permanent magnet side, further the inclination to the movable plate
It is characterized in that it is provided with an electrical contact for detecting the overturned state .
It is something .

[0005]

The permanent magnet is attracted to the approaching magnetic body and the movable plate is tilted, so that the electrical contact is actuated and the approach can be detected as an electrical signal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention will now be described with reference to the drawings. 1
Is a rectangular insulating substrate, and a pair of conductive terminals 2 and 3 are printed on one end of the substrate 1. Reference numeral 4 denotes a movable plate made of a rectangular conductive plate. The movable plate 4 has fulcrums 5 and 5 projecting from both sides of the central portion, and the fulcrums 5 and 5 projecting from both side edges of the substrate 1. The movable plate 4 is supported by bearing pieces 6 and 6 so as to be swingable in a seesaw shape. Then, the permanent magnet 7 is fixed to the lower surface of one end of the movable plate 4, and the weight 8 that balances the weight of the permanent magnet 7 is fixed to the other end.

Reference numeral 9 is a conductive elastic member formed by fixing one end to the conductive terminal 2 and engaging the L-shaped bent portion 10 at the other end closer to the weight 8 than the fulcrums 5 and 5 on the upper surface of the movable plate 4. A spring made of a wire rod, and the movable plate 4 is moved downward by the spring 9 with the weight 8 side down.
You are urged to become permanent magnet 7 side is lifted. Further, 11 is an electric contact provided on the end of the movable plate 4 on the permanent magnet 7 side, 12 is an electric contact printed on the substrate 1 so as to face the electric contact 11, and the electric contact 12 and the conductive terminal The conductive wire 13 on the substrate 1 is electrically connected to 3. Reference numeral 14 is a resin case which is placed on the substrate 1.

An example of the use of this magnetic proximity sensor is shown in FIGS. 3 and 4, in which 15 is a pachinko machine game board, 16 is a ball hitting hole provided on the front surface of the game board, 1
7 is a plastic case plate 1 on the back side of the winning opening 16
It is a winning ball passage formed by being surrounded by 8. The magnetic proximity sensor of the present invention is fixed to the case plate 18 so that the permanent magnet 7 faces the winning ball passage 17, and the winning opening 1
When the pachinko ball 19 entered in 6 reaches the winning ball passage 17, the permanent magnet 7 is magnetically attracted to the pachinko ball 19 to tilt the movable plate 4 so that the electric contact 11 is turned on to the electric contact 12 and the conductive terminals 2 and 3 are connected. Is conducted.

In this magnetic proximity sensor, the contact is opened and closed by mechanical movement, but the permanent magnet 7 and the weight 8 are balanced, and therefore malfunction due to external vibration. Is less likely to occur, and there is no restriction on the mounting posture during use. Since the permanent magnet can be operated by a slight attraction force, the approach of the magnetic body can be detected with high sensitivity. Regarding chattering, which is a drawback of the mechanical contact method, in the present invention, the electric contact is closed by suction due to the magnetic force, so that a hysteresis effect (click action) occurs in the movement, and halfway chattering is prevented. In addition, the magnetic proximity sensor of the present invention
Since it is a mechanical contact system as described above, it can be used easily without the need for an electronic circuit such as an oscillator or an amplifier. Therefore, as shown in FIG. 4, a large number of winning holes provided on the pachinko machine game board 15 are provided. Even if each of these magnetic proximity sensors is attached to the computer 19, the number of winnings of the pachinko balls of each winning opening can be counted and stored in the computer 19 at low cost, which is effective for grasping the winning rate and the like.

[0010] In summary, the present invention can highly sensitive sensors a and <br/> long et large width in cost, which when used as an evaluation pachinko ball passage sensor for pachinko game board, separated by more than 10 mm It can be easily detected from the glass surface or from outside the ball passage, and is not affected by the Shin-Tu nails hit on the game board at all, so stable detection is possible. Further, since it is a contact output, it is easy to connect on the measurement side, and there is a restriction that the object to be detected is only a magnetic material, but conversely, there is an advantage that there is less restriction on the sensor mounting part and conditions and easy handling. In the above example,
As shown in FIG. 1, the movable plate 4 is tilted to the weight 8 side by the spring 9.
However, the spring 9 is used to move the movable plate 4
May be biased so as to be tilted toward the permanent magnet 7 side. in short
This spring 9 moves the movable plate 4 when the surrounding environment has no magnetic substance.
The delusion of the movable plate 4 can be prevented by tilting it in one direction.
It is provided to eliminate it.

[0011]

As described above, according to the present invention, there is a beneficial effect that a magnetic proximity sensor can be provided at a low cost and with high sensitivity.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic proximity sensor according to the present invention.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a vertical sectional view showing a usage state.

FIG. 4 is a system diagram showing a usage state.

[Explanation of symbols]

 1 Substrate 4 Movable Plate 7 Permanent Magnet 8 Weight 9 Spring 11, 12 Electrical Contact

Claims (1)

[Claims] 1. A permanent magnet is fixed to one end of a movable plate which is swingably supported in a seesaw shape, and a weight for balancing the weight of the permanent magnet is provided at the other end, and the movable plate is attached to the weight side.
Or a weak spring that biases it toward the permanent magnet side.
Only, further its reclined magnetic proximity sensor characterized by comprising providing electrical contacts for detecting the on movable plate -.