JPH0319904Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a movement amount detection device, and is particularly suitable for use in game machines such as pachinko machines, and is used to convert the movement amount of an operating member into a DC voltage. The present invention relates to a movement amount conversion device.

[Prior art]

In game machines such as pachinko machines, when converting the amount of rotation of the ball-striking control dial into an electrical signal, it is necessary to faithfully perform subtle operations specific to the game, such as when turning from clockwise to counterclockwise. , if there is a dead zone, the player will feel that there is a ``looseness''.

Therefore, as this type of conversion device, a mechanical-electrical converter is used, which is relatively resistant to play.
In particular, variable resistors are a typical example, but they have had problems in terms of mechanical life.

Although various photoelectric converters can be used, for example, in the case of a pulse counting type converter, if the accuracy is to be increased, the gear mechanism and electronic circuit will require higher accuracy. Furthermore, from the standpoint of long life and maintenance, consideration must be given to dealing with "dust" in the optical section.

[Purpose of invention]

The present invention was developed in view of the above-mentioned drawbacks, and in addition to the feature that no mechanical detection mechanism is required, it is resistant to adverse conditions such as dust, temperature, and humidity inherent to magnetic methods.
It is an object of the present invention to provide a movement amount converting device that does not require special considerations for dimensional accuracy, etc., and can reliably convert a movement amount into an electrical signal.

[Structure of the idea]

The present invention is configured to convert the amount of movement by applying "electromagnetic induction", and is driven by alternating current signals with different phase differences, and is arranged coaxially and spaced apart from each other. a first coil and a second coil; a detection coil that is disposed between these coils and detects a magnetic field generated by the first coil and the second coil; and a drive current for the first coil or the second coil. and a flip-flop that changes the phase difference between the phase of the first coil and the induced current of the detection coil into changes in the duty ratio of the pulse, and a smoothing circuit that changes the output of this flip-flop into a DC signal.
The relative movement between the coil and the detection coil is converted into a DC signal.

[Configuration of Example]

Hereinafter, the present invention will be described with reference to a preferred embodiment of the accompanying drawings.

FIG. 1 shows an embodiment in which the device of the present invention is applied to a device for converting the amount of rotational movement of an operating handle of a pachinko machine. An operating handle 1 is arranged at the lower right of the front of the pachinko machine, and an L-shaped bar 2 is fixed on the back side of the operating handle 1 at the center of rotation. Convert. This L
One ends of wires 3 and 4 are fixed to the tip 2a of the character rod 2, and the other end of the wire 3 is
It is fixed to the main body via a tension spring 5 for biasing and positioning the operating handle 1 to a predetermined position, the other end of the wire 4 has a tension direction changed by 90 degrees by a shaft 7, and is made of an insulator. It is fixed to the movable rod 8.

Furthermore, since the other end of this movable rod 8 is fixed to the main body via a tension spring 6, by pulling the wires 3 and 4 against the biasing forces of springs 5 and 6, this movable rod 8 moves in the direction in which the wire 4 is pulled. However, the operating handle 1
When the rotation operation is stopped, the operating handle 1 is returned counterclockwise to a position where the biasing forces of the tension springs 5 and 6 are balanced and then stopped.

A detection coil 9 is wound around the movable rod 8, and detects a magnetic field generated by a first coil 11 and a second coil 12, which will be described later.

The first coil 11 and the second coil 12 are arranged coaxially with the movable rod 8, are wound on both sides of a hollow cylinder 10 made of an insulator, and are fixed with, for example, tape or adhesive, and This cylinder 10 is also fixed to the main body. Furthermore, these first
A signal processing circuit 2 that drives the coil 11 and the second coil 12 with AC signals having different phases, and converts the current flowing through the detection coil 9 that detects the magnetic fields of these coils 11 and 12 into a DC signal.
0, and the DC output of this processing circuit 20 drives the plunger 40 via the plunger drive circuit 30. The plunger drive circuit 30 has a well-known circuit configuration that periodically applies drive pulses with different amplitudes to the plunger 40 depending on the input DC voltage.

An elastic spring is provided at the tip of the drive lever of the plunger 40, and the pachinko ball 60 is ejected along the guide rail 50 at each drive pulse.

The movement amount converting device section will be explained in detail with reference to the circuit connection diagram shown in FIG. Here, the same reference numerals as in FIG. 1 indicate the same parts. The hollow cylinder 10
One end of the first coil 11 and second coil 12 wound on both sides of the oscilloscope is grounded, and the other end is supplied with an alternating current signal from a sine wave oscillator 21 via drive amplifiers 22 and 24. Here, the drive amplifier 22 is composed of a voltage follower,
A capacitor C is connected to the positive input terminal of the drive amplifier 24.
1 and a resistor R1 in series, the phase difference between the drive current of the second coil and the drive current of the first coil 11 is approximately π/2.

In addition, the negative feedback resistors R2 and R of the drive amplifier 24
Reference numeral 3 denotes a resistor for adjusting the gain of the amplifier 24 and making the drive currents of the first coil 11 and the second coil 12 equal. The output of the drive amplifier 22 is connected to the positive input terminal of a comparator 25 whose negative input terminal is connected to ground.

One end of the detection coil 9 wound around the approximate center of the movable rod 8 is grounded, and the other end is connected via a resistor R4 to the negative input terminal of an amplifier 26 whose positive input terminal is grounded. The output is connected to a negative input terminal via a negative feedback resistor R5, and is also connected to a positive input terminal of a comparator 27 whose negative input terminal is grounded.

The outputs of the comparators 25 and 27 are input to the set and reset terminals of a flip-flop 28, respectively, and output pulses with a duty ratio corresponding to the phase difference between the two outputs.

The output of this flip-flop 28 is the resistor R6
Smoothing circuit 2 consisting of a series circuit of and capacitor C2
9 converts the voltage into a DC voltage and inputs it to the plunger drive circuit 30. FIG. 3 shows signal waveforms on each line in this circuit diagram.

[Effect of the embodiment]

Next, the operation of the embodiment configured as described above will be explained with reference to FIGS. 1 to 3. First, when the operation dial 1 is not touched, the movable rod 8
is balanced at a predetermined position by the biasing forces of springs 5 and 6, but the balanced position is determined by the detection coil 9 and the first
It is assumed that the coil 11 is located at the same center. At this time, the first coil 11 and the second coil 1
Since the phases of the drive currents of these coils 11 and 12 are shifted by π/2, the magnetic field generated by 2 is strongly affected by the electromagnetic induction of the first coil 11 when the detection coil 9 is close to the first coil 11, and the detection coil When 9 is close to the second coil 12, the second coil 1
2. Strongly receives electromagnetic induction. Therefore, it is easily understood that the phase of the induced current generated in the detection coil 9 changes depending on the location of the detection coil 9. For example, coils 11 and 12
If the drive current of is expressed as a rotation vector, the phase difference is π/2, so when it is close to the second coil 12, the phase angle θ of the induced current of the detection coil 9 is is large, and when it is close to the first coil 11, the phase angle θ of the induced current in this coil 9 is small.

Therefore, in the above equilibrium state, the sine wave oscillator 2
Assuming that the output from 1 is a sine wave signal like L1, the output of comparator 25 is
A square wave output like L4 can be obtained. Furthermore, since the current induced in the detection coil 9 is also in the same phase as the first coil 11, the output of the comparator 27 has the same waveform as the output of the comparator 25, and the duty ratio of the output L6 of the flip-flop 28 becomes zero.

Here, when the operation dial 1 is operated and rotated clockwise, the wire 4 is pulled against the biasing force of the spring 6, and the movable rod 8, that is, the detection coil 9 is moved toward the second coil 12 side. let

Due to this movement, the phase of the AC signal induced in the detection coil 9 approaches the phase of the drive current of the second coil 12, and the output waveform of the comparator 27 has a phase advance of π/2 as shown by the broken line. Approaching a square wave pulse. On the other hand, comparator 25
Since the output of the flip-flop 28 does not change like L4, the duty ratio of the output of the flip-flop 28 driven by the down pulse increases from zero to 1/4 as shown by L6. Furthermore, this flip-flop 2
8 is converted into a DC voltage by the smoothing circuit 29, so the output of the smoothing circuit 29 is the output waveform L6
The DC voltage corresponds to the duty ratio of

In this way, the amount of rotational movement of the operating handle 1 is converted into a DC voltage by the first coil 11, second coil 12, detection coil 9, and signal processing circuit 20.

This DC voltage is applied to a well-known plunger drive circuit 30.
In order to drive the plunger 40 for firing, the force is proportional to the amount of rotation of the operating handle 1.
And the plunger 40 releases the pachinko ball 6 at a predetermined period.
0 will be played.

In the above explanation, the relative movement between the first coil and the second coil and the detection coil is performed by moving the detection coil. It goes without saying that the same detection can be made even if the hollow cylinder 10 is fixed and the hollow cylinder 10 is moved.

[Effect of idea]

As explained above, according to the device of the present invention, the amount of movement of the operating handle is converted into DC voltage by using the electromagnetic induction effect of the coil. It can be used and has very high durability since there is no radial pressure and the only axial resistance is friction.

Furthermore, the error in the detection signal due to the arrangement of the detection coils will almost cancel out if the first and second coils are wound in parallel, making it easier to identify the product number and eliminating normal It is not affected by foreign substances at all.

In addition, since it is configured with a low-pass system that does not use extreme high frequencies or TTL, external noise can be suppressed, and even if it malfunctions, it will only affect that moment and will not affect it later.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of an embodiment in which the present invention is applied to a mechanism for converting the amount of operation movement of the operation dial of a pachinko machine, Fig. 2 is a circuit connection diagram of the signal processing section of this mechanism, and Fig. 3 is A time chart showing the signal waveforms on each line of this circuit diagram, and FIG. 4 are explanatory diagrams showing the rotational vector of the current induced in the detection coil. 1... Operation handle, 5, 6... Spring, 8...
Movable rod, 9...detection coil, 10...hollow cylinder,
11...First coil, 12...Second coil, 20
... Signal processing circuit, 21 ... Sine wave oscillator, 22
...Amplifier, 23...Phase circuit, 24, 26...
Amplifier, 25, 27... Comparator, 28...
Flip-flop, 29...Smoothing circuit, 30...
Plunger drive circuit, 40...plunger.

Claims (1)

[Scope of utility model registration request] A first coil and a second coil driven by alternating current signals with different phase differences and arranged coaxially and spaced apart from each other; a detection coil arranged sandwiched between these coils; The first coil comprises a flip-flop that changes the phase difference between the drive current of the first coil or the second coil and the induced current of the detection coil into a change in duty ratio, and a smoothing circuit that converts the output of this flip-flop into a DC signal. A movement amount conversion device characterized by converting relative movement between a coil and a second coil and a detection coil into a DC voltage.