JPH04144575A - Filter, circuit, metal detecting device and pinball game machine - Google Patents

Abstract

PURPOSE:To singly cope with two kinds of transmitting frequencies, to effectively utilize the space due to miniaturization and to reduce the cost by providing a second capacitor on a primary side of a transformer with a trimmer, and providing a third capacitor and a second resistor on its secondary side. CONSTITUTION:A band pass filter is provided with a first capacitor (C1) 81 of an input side, a first resistor (R1) 82 connected to a first capacitor 81 by its output side, and a transformer 83 with a trimmer connected to a first resistor 82 by its output side. Also, a primary side of the transformer 83 with a trimmer is provided with a second capacitor (C2) 84, and its secondary side is provided with a third capacitor (C3) 85, a second resistor (R2) 86 and a third resistor (R3) 87. The transformer 83 with a trimmer copes with two kinds of transmitting frequencies of f1(1MHz) and f2(1.3MHz), therefore, it is designed so as to cope with a frequency of (1.15MHz) between them.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a filter circuit, a metal sensor, and a pachinko game machine, and particularly to one that can support two types of transmission frequencies.

``Prior Art'' For example, in a pachinko game machine, it is difficult to accurately grasp the ball played by a player, the so-called input ball, and the ball output as a prize for the ball that entered the safe hole for each pachinko game machine. This is the most important information for profit management and customer management. In order to determine the incoming and outgoing balls, metal detection devices have been developed for pachinko game machines that detect the passage of pachinko balls along the board surface of the machine.

As such a metal detection device, an attempt has been made to detect the passing of pachinko balls by installing a metal sensor having detection units in a matrix shape along the board of a pachinko game machine using transmission lines and reception lines.

"Problem to be Solved by the Invention" However, in the above conventional technology, since pachinko game machines generally generate noise of various frequencies, when the frequency of the noise matches the transmission frequency used,
A problem arises in that the detection accuracy of pachinko balls deteriorates.

In order to solve this problem, it is possible to switch the transmission frequency between two types of frequencies, but to do so, two filter circuits suitable for each frequency must be installed, and metal detection There is a problem in that it is not possible to effectively utilize space and reduce costs by downsizing the device.

The present invention was made by focusing on these problems.
The object of the present invention is to provide a filter circuit, a metal detection device, and a pachinko game machine that can independently support two types of transmission frequencies, and that can effectively utilize space and reduce costs through miniaturization. ).

"Means for Solving the Problems" The gist of the present invention for achieving such objects is as follows: 1. A first capacitor on the input side, and a first resistor connected to the first capacitor on its output side. and a trimmer-equipped transformer connected to the first resistor on its output side, the primary side of the trimmer-equipped transformer having a second capacitor, and the secondary side thereof having a third capacitor and a second resistor. A filter circuit characterized by having a filter circuit.

2 A plurality of parallel folded transmission lines are attached to one side of the board, and a plurality of parallel folded reception lines whose electromagnetic characteristics change when metal approaches are electromagnetically coupled in a direction crossing the transmission lines. A metal sensor disposed on the opposite surface of the substrate to form a planar detection matrix; a transmission circuit that sequentially transmits a signal of a predetermined frequency to each transmission line; and Item 1 for a transmission signal of the transmission circuit. A metal detection device comprising: a filter circuit; and a reception circuit that sequentially receives signals from each reception line in synchronization with the transmission circuit.

A pachinko game machine is provided, characterized in that the metal detection device according to item 32 is provided along the board surface, and the metal is a pachinko ball.

"Operation" When processing two types of transmission signals with different frequencies, the first capacitor on the input side cuts the DC signal of the digital signal. The second capacitor and the third capacitor tune the transmitter to two different transmission frequencies, and the first resistor and the second resistor set the input/output impedance. A trimmer adjusts the magnitudes of the transmitted signals of the two types of frequencies to be equal. In this way, a sine waveform signal with less distortion can be obtained by processing using a transformer with a trimmer.

In a metal detection device, when a magnetic field is generated by passing a current through a folded transmission line constituting a detection matrix, an electromotive force is generated in a reception line electromagnetically coupled to the transmission line due to mutual induction. At this time, when a pachinko ball approaches a metal sensor, an eddy current is generated on the surface of the metal in a direction that cancels out the magnetic flux generated by the metal sensor. The impedance of the transmission line changes due to the influence of the eddy current, causing the current to change.

Correspondingly, the receiving line changes the magnitude of the electromotive force. The transmission line and reception line at this time are detected, and the position of the metal in the detection matrix can be determined as coordinates from the intersection position. In this case, when the frequency of the transmission signal and the frequency of noise generated from a pachinko game machine or the like match or are close to each other, a multiplied signal is output at a frequency that is not affected by noise. The filter circuit can obtain a sinusoidal transmission signal with less distortion by processing with a transformer equipped with a trimmer.

In a pachinko game machine, the movement of pachinko balls can be tracked as changes in coordinates on the board.
Metal sensors are attached to important points such as out holes to monitor the progress of the game, to know the status of balls entering and exiting, and to manage play and stoppages.
It is used to check for abnormalities caused by fraud and as data for nail adjustments, etc.

“Example” An example of the present invention will be described below with reference to the drawings.

1 to 17 show an embodiment of the present invention. In the first embodiment, a metal detection device is constructed using a metal sensor, and this is applied to a pachinko game machine 10.

As shown in FIGS. 2 and 3, a pachinko game machine 1
A detection matrix 20 constituted by a metal sensor is attached along the board surface 11 of 0.

On the board surface 11 of the pachinko game machine 10, the inside of the guide rail 12 forms a game area, and a large number of nails 13, 13, etc. for repelling pachinko balls are driven into this game area, and safe holes 14a, 14a, 14a, 14a, 2, 3, 3, 3, 3, 4, 4, 4, 5, 4, 5, 4, 5, 4, 5, etc. are driven into the board surface 11 of the pachinko game machine 10. ... has been opened, and an out hole 15 has been opened at the lower end of the game area.

The front glass lid covering the board surface 11 is the surface glass body 16
It has a double structure with an inner glass body 17 and an inner glass body 17.

The front of the pachinko game machine 10 is provided with a launch handle 33 for operating the launch of pachinko balls, and a kingdom 34 for receiving and receiving the balls.

As shown in FIG. 4, the plurality of transmission lines 22 are formed by one transmission line 22 making a U-turn at the folding part 61 and forming a parallel folded shape (
or a loop shape), and these are arranged in parallel in one direction on the same plane. In addition, multiple receiving lines 2
6, similarly, one reception line 26 is U-turned to form a parallel folded shape (or loop shape), and these are arranged in parallel in one direction on the same plane. The transmitting terminal 23 and the receiving terminal 27 are concentrated at the lower end of the inner glass body (front glass) 17 in a vertical relationship when attached to a pachinko game machine.

Each receiving line 26 is electromagnetically coupled to each transmitting line 22, and arranged in a direction perpendicular to the plane parallel to each transmitting line 22 so that its electromagnetic characteristics change when a metal such as a pachinko ball approaches. The transmission line 22 and each reception line 26 constitute a detection matrix 20.

In the front view of FIG. 4, each transmission line 22 and each reception line 2 intersect.
Each square portion surrounded by 6 and 6 constitutes a detection unit 20a, 20a--, which detects pachinko balls by impedance change, which is an electromagnetic characteristic value.
Some of a, 20a... are as shown in FIG.
Safe hole 14a.

14 a---. The detection matrix 20 is provided on the inner glass body (front glass) 17, which is the inner side of the two glass bodies that cover the board surface 11 as shown in FIG. 3 and is on the board surface side.

Figure 5 (A) shows an enlarged cross-sectional view of the inner glass body, and (B)
In (A), an enlarged view of the rounded side part is shown by the dashed line.
The inner glass body 17 includes an inner protective glass plate 17a which is a protective sheet for the receiving line 26 (shown in FIG. 4), a receiving side glass base substrate 17b, and a transmitting side glass base substrate 17.
c. It has a quadruple laminated structure of an outer glass plate 17d which is a protective sheet for the transmission line 22 (shown in FIG. 4). The inner glass body (front glass) 17 typically has a vertical length a of 367±10 mm and a horizontal length b of 405 mm.
It is a glass substrate having a rectangular shape with a size of ±lO-■ and a thickness of 3.0 to 3.51 . The inner protective glass plate 17a and the outer glass plate 17d are the receiving side glass base substrate 17b and the transmitting side glass base substrate l.
The length of the inner glass body 17 is shorter than that of the glass body C, and the inner glass body 17 has a lower end 1
7p is exposed.

Internal protective glass plate 17a and receiving side glass base substrate 17
A plurality of parallel folded reception lines 26 are connected between
A plurality of parallel folded transmission lines 22 are sandwiched between the transmission side glass base substrate 17c and the outer glass plate 17d. Therefore, the inner glass body 17
The transmitting line 22 is bonded and arranged on one surface of the transmitting side glass base substrate 17c with a transparent adhesive layer 18a, the outer glass plate 17d is bonded thereon with a transparent adhesive layer 18b, and the receiving side glass The reception line 26 is bonded and arranged on the other surface of the base substrate 17b with a transparent adhesive layer 18c, and the internal protective glass plate 17a is bonded thereon with a transparent adhesive layer 18d. the other side and the receiving side glass base substrate 17
b and the other surface thereof are bonded together with a transparent adhesive layer 18e.

A transparent conductive film for shielding is provided on the entire surface of the outer glass plate 17d, which is the front side of the plurality of transmission lines 22. The transparent conductive film is indium oxide (1,T,O,)
or tin oxide film.

As shown in FIG. 4, the rectangular transmitting side glass base substrate 17c has a transmitting side folded substrate 1 made of an elongated flexible printed circuit board (FPC) along one longitudinal side thereof.
9a, and an L-shaped transmission side routing board 19b, also made of a flexible board, is glued along the opposite side in the vertical direction and part of the lower end side. Transmission side folding board 19a
As shown in FIG. 6, a plurality of arcuate side folds 61, specifically 32, are formed in a row using a metal pattern made of copper foil, and as shown in FIG. one end 6
One end 62a of a wire 62 is connected to 1a by soldering using solder 63 or by welding.

FIG. 8 shows an enlarged view of the portion circled by broken lines in FIGS. 4 and 5. FIG. As shown in FIG. 7, a plurality of metal patterns, specifically 64 metal patterns made of copper foil are formed on the lower edge of the transmission side routing board 19b on the opposite side along a part of the side. Transmission terminal 23 for external connection extending vertically
is formed.

As shown in FIG. 5(A), the transmission terminal 23 is arranged at the lower end 17p of the inner glass body 17, and the outer glass plate 17d.
exposed and not covered. That is, the outer glass plate 17d is bonded to the transmission line 22 excluding the transmission terminal 23 on the transmission side glass base substrate 17c. The terminal side of each transmission line 22 has a transmission terminal 23 of each transmission line 22 and a routing section 64 to each transmission terminal 23. A routing portion 64 to each transmission terminal 23 is formed on the transmission side routing board 19b using a metal pattern, and extends from each transmission terminal 23 along the transmission side routing board 19b.

In FIG. 6, the other end 62b of the wire 62 extending from one end 61a of each folded portion 61 is attached with solder 62b to the starting point 64a of the wiring portion 64 on the corresponding terminal side, with tension applied to the wire 62.
3 by soldering or welding, and is connected to the transmission terminal 23 via the routing portion 64. Note that the routing portion 64 has two straight portions connected by an arcuate portion 64R in order to remove high frequency interference.

Similarly, the rectangular receiving glass base substrate 17a is
Receiving side folding board 29a along one side of the upper end in the horizontal direction.
is adhered, and an elongated receiving side routing board 29b is adhered along a part of the lower end side in the lateral direction. Receiving side folding board 29
Similar to the transmission-side folded board 19a, a has a metal pattern made of copper foil to form a plurality of arc-shaped folded parts 61, specifically 32 arc-shaped folded parts 61, and one end 62a of the wire 62 is connected to one end 61a of each folded part. The connection is made by soldering using solder 63 or by welding.

At one lower end of the receiving side routing board 29b on the opposite side, a transmitting side glass base board 17c is placed on the edge thereof and along a part of the side.
When the receiving side glass base substrate 17b is attached to the
A plurality of, specifically 64, vertically extending receiving terminals 27 for external connection are formed by metal patterns made of copper foil at non-opposing positions that do not overlap with each other.

The receiving terminal 27 is connected to the inner glass body 1 as shown in FIG.
7, and is exposed without being covered by the internal protective glass plate 17a. That is, the internal protective glass plate 17a is bonded onto the receiving line 26 excluding the receiving terminal 27 on the receiving side glass base substrate 17b.

The terminal side of each receiving line 26 is the receiving terminal 27 of each receiving line 26.
and a routing portion 64 to each reception terminal 27. The routing portion 64 to each receiving terminal 27 is formed on the receiving side routing board 29b using a metal pattern, and extends from each receiving terminal 27 along the receiving side routing board 29b.

The other end 62b of the wire 62 extending from one end 61a of each folded portion 61 is connected to the starting point 64a of the routing portion 64 on the corresponding terminal side by soldering or welding using solder 63, while giving tension to the wire 62. The receiving terminal 27 is connected to the receiving terminal 27 via the routing section 64.

The transmission line 22 and the reception line 26 are thus connected to each folding part 61 formed on each folding board 19a, 29a, each routing part 64 formed on each routing board 19b, 29b, and each folding part 61 formed on each folding board 19a, 29a. It is composed of a wire 62, a transmitting terminal 23 forming the end of the transmitting line 22, and a receiving terminal 27 forming the end of the receiving line 26. Each wire 62 has a matte black surface to prevent reflection of light so as not to be noticeable to players.

Detection matrix 2 suitable for normal pachinko game machine 10
0 pattern has 32 lines of transmitting lines 22 and 3 lines of receiving lines 26.
The pattern has two rows and a total of 1024 detection units 20a. Note that in FIG. 4, patterns other than those on the outside are omitted.

Transmission line 22. The thickness of the wire constituting the receiving line 26 is preferably set to a value of 25 pm to 30 pm. In the case of this embodiment, as shown in FIG. , d are each 126 m1+, and as shown in FIG.
Radiation e and f of the portion extending in the vertical direction of the transmission side routing board 19b are each formed to be 10■■ or less.

Further, as shown in FIG. 8, the width g of each of the transmitting terminal 23 and the receiving terminal 27 is 1.5 -. By setting the radiuses e and f of the routing portion 64 to 10 - or less, the transmitting side folding board 19a and the transmitting side routing board 19b can be connected to the inner glass body (front glass) 17 of the pachinko game machine.
It is hidden behind the mounting frame for the player and cannot be seen from the front side where the players are.

As shown in FIG. 9, a transmitting circuit board 66a and a receiving circuit board 66b are installed at the inner lower part of the mounting frame. A circuit 40 is provided, and the reception circuit board 66b includes a reception circuit 5 that receives signals from a plurality of reception lines 26.
0 is set. A transmitting connector 67a and a receiving connector 67b are provided on these boards 66a, 66b at positions corresponding to the transmitting terminal 23 and receiving terminal 27.

The transmission connector 67a connects the transmission terminal 23 to the transmission circuit board 66.
The receiving connector 67b is an edge connector for removably connecting to the transmitting circuit 40 on the receiving terminal 27a.
This is an edge connector for removably connecting the receiver circuit 50 on the receiver circuit board 66b. That is, in the transmitting connector 67a and the receiving connector 67b, a groove 68a is formed in the upper part of the elongated insulator 68 along the length direction of the transmitting circuit board 66a and the receiving circuit board 66b, and a groove 68a is formed at the bottom of the groove 68a. , each circuit board 66a, 66b in a state where a large number of conductive wires connected to each circuit board 66a, 66b are insulated by a rubber base so that they do not contact each other.
It is configured to be buried in the vertical direction with respect to 66b.

The inner glass body (front glass) 17 on which the transmitting terminal 23 and the receiving terminal 27 are arranged can be inserted into the groove 68a of each insulator 68, and the transmitting connector 67a is inserted with the inner glass body 17 sandwiched from both sides. Transmission terminal 23 of transmission line 22
and the reception connector 67b connects to the reception line 2 in that state.
Connect to the receiving terminal 27 of No. 6.

The transmission terminal 23 and the reception terminal 27 are connected to the transmission circuit 40 and the reception circuit 50 by positioning the transmission terminal 23 and the reception terminal 27 below the inner glass body 17 so as to be connectable to the transmission connector 67a$ and the reception connector 67b. Groove 68
This is done by inserting the inner glass body 17 into the mounting frame so that the transmitting terminal 23 and the receiving terminal 27 are securely connected to the transmitting connector 67a and the receiving connector 67b.

The signal processing system constituting the metal detection device for detecting pachinko balls is as shown in FIGS. 10 to 14.

As shown in FIG. 10, the sensing matrix 20 is under the control of a CPU memory control board 172 via a matrix I10 transmitting/receiving board 171. The CPU memory control board 172 is capable of communicating via a communication line 179, and is also capable of reading and using data from the RAM card 173. RAM
The card 173 records data on the positions of the safe holes 14a, 14a=, an algorithm for detecting pachinko balls entering the safe holes 14a, 14a-, and the like.

The option 174 connected to the CPU memory control board 172 is connected to the board 1 of the pachinko game machine IO.
This is a device for recording the trajectory of pachinko balls moving around between the pachinko ball 1 and the inner glass body 17. Option 174 is
There are also methods that store data in semiconductor memory, etc., but during times when the number of players increases, the operating rate of the pachinko game machine 10 is high, so a huge amount of storage capacity is required. Memory is generally expensive and
Since this requires more space, hard disks are now being used to record the movements of pachinko balls. The recorded data is processed by a computer equipped with software for analyzing the trajectory of the pachinko balls, and the necessary data can be obtained at the pachinko parlor (hall).

The matrix I10 transmitting/receiving board 171 includes a transmitting circuit board 86a provided with a transmitting circuit 40, and a receiving circuit board 66b provided with a receiving circuit 50.

As shown in FIG. 11, the transmitting circuit 40 includes a transmitting connector 41, an amplifier 42 and channel switching logic 43 connected to the transmitting connector 41, an analog multiplexer 44 connected to the amplifier 42 and channel switching logic 43, and an analog multiplexer 44 connected to the amplifier 42 and channel switching logic 43. 44, and 32 Ps each connected to the transmission line 22 side of a plurality of, specifically 32 circuits, via the transmission connector 67a.
It is composed of an NP+NPN totem pole driver 45.

As shown in FIG. 12, the channel switching logic 43 effectively utilizes the counter IC 43a and operates using two control lines, one for clock and one for reset.

As shown in FIG. 13, the receiving circuit 50 connects a plurality of, specifically 32, Ii communication lines 2 via a receiving connector 55.
32 CT sensors (current transformers) 5 connected to 6 sides each
1, an analog multiplexer 52 connected to the CT sensor 51, an amplifier 953 and channel switching logic 54 connected to the analog multiplexer 52, and an amplifier 5
3 and a receiving connector 55 connected to the channel switching logic 54. The CT sensor 51 insulates each reception line 26 from the analog multiplexer 52 and amplifies the signal from each reception line 26 by ten times. The channel switching logic 54 is a member similar to the channel switching logic 43 of the transmitting circuit 40.

As shown in FIG. 14, the CPU memory control board 172, on the sending side, connects to the CPU connector 46 connected to the CPU unit 30 and the cpυ connector 46.
It includes a sequence control circuit 47 that sends a transmission clock in response to a start signal from the CPU unit 30, a band pass filter 48 that receives the transmission clock and sends a transmission signal, and an amplifier 49 that amplifies the transmission signal and sends it to the transmission connector. are doing. The sequence control circuit 47 operates f, (IMHz
) s6 and f* (1.3 MHz).

Specifically, the bandpass filter 48 has a configuration shown in FIG. 1. That is, the bandpass filter 48 includes a first capacitor (C1) 81 on the input side and a first resistor (R1) connected to the first capacitor 81 on the output side.
82, and a trimmer-equipped transformer 83 connected to the first resistor 82 on its output side. In addition, the primary side of the transformer 83 with a trimmer is connected to a second capacitor (C2).
84, the secondary side of which is a third capacitor (C3) 85
, a second resistor (R2) 86, and a third resistor (R3) 87
It has The transformer 83 with trimmer is f□
(IMHz) and f2 (1,3MHz), the intermediate f, (1,15MHz)
MH2) is designed to adapt to the frequency of
(See Figure 7).

Further, on the receiving side, the CPU memory control board 172 includes an amplifier 71 that amplifies the received signal from the receiving connector 55, and a bandpass filter 72 that receives the amplified signal.
, an aftereffect rectifier/amplifier 73 that receives the received signal from the band-pass filter 72, and two-stage low-pass filters 74a, 74b that receive the received signal from the full-wave rectifier/amplifier 73.
The A/D converter 75 receives the received signal from the low-pass filter 74b, and sends it to the bidirectional RAM 76, which is digital data under the control of the sequence control circuit 47. Write data to CPU connector 46
The CPU connector 4 receives data according to the read signal from the CPU connector 4.
6 to the CPU unit 30 via the bidirectional RAM 76
It has

The bidirectional RAM 76 has an internal counter, and all processing of pachinko ball matrix data is performed by this counter. Furthermore, the CPU memory control board 72 has a power supply unit 77.

The voltage waveform to the transmission line 22 has a frequency of 1 to 1.3M.
A continuous sine wave centered at Ov of Hz is preferred.

Next, the action will be explained.

Address signals and control signals from the CPU unit 30 are transmitted to the pachinko game machine 10 via the CPU connector 46.

In the pachinko game machine IO, on the transmitting side, the sequence control circuit 47 receives the start signal, divides the 16 MHz original clock as necessary, switches between two types of transmission clocks, and selects the one for the pachinko game machine IO. Outputs a clock for the transmission frequency that is not affected by noise. In this way, the frequency of the transmitted signal and the pachinko game machine lO
It is possible to avoid being affected by noise when the frequency of noise generated from other sources matches or is close to each other. At this time, the transmission frequency is
fs(IM
Hz) and f2 (1.3MHz).

The transmission clock from the sequence control circuit 47 is waveform-shaped by a bandpass filter 48 from a digital signal to an analog signal.

In the bandpass filter 48, in order to be able to process two types of transmission signals having different frequencies, a first capacitor 81 on the input side cuts the DC transmission signal from the digital signal. 2 by the second capacitor 84 and the third capacitor 85
The first resistor 82 and the second resistor 86 set the input/output impedance.

By the trimmer 83, as shown in FIG.
Adjustments are made so that the magnitudes and sensitivities of the two types of frequency transmission signals, IMHz) and fs (1.3MHz), are equal. In this way, the processing by the trimmer-equipped transformer 83 makes it possible to obtain a sinusoidal signal with little distortion and synchronized with the digital signal.

After waveform shaping by the bandpass filter 48, the transmission signal is amplified by the amplifier 49 and sent to the transmission connector 41.

Furthermore, the transmission signal is amplified by an amplifier 42 in the transmission circuit 40. The analog multiplexer 44 is a channel switched by the channel switching logic 43,
The totem pole driver 45 is operated in sequence, so that the totem pole driver 45 sequentially outputs the signal amplified by the amplifier 42 to the transmission line 22 at a predetermined period (see step 91 in FIG. 15).

On the receiving side, as shown in FIG.
The current, which is an electromagnetic characteristic value, is amplified ten times by the CT sensor 51. Since amplification is performed by the CT sensor 51, there is no need to increase the amplification degree of the amplifier on the receiving side. Since the amplification by the CT sensor 51 is performed with each reception line 26 and the analog multiplexer 52 insulated, it can be performed without generating noise. As a result, compared to using an OP amplifier,
It is possible to prevent the occurrence of noise and DC drift due to the OP amplifier itself, and it is possible to improve the detection accuracy of the received signal. By using the CT sensor 51, there is no need to use an OP amplifier, which is generally larger than a CT sensor, and the matrix I10 transmission/reception board 71 can be made smaller.

The amount of noise is extremely small compared to the signal, and errors due to noise can be ignored. Low pass filter 74a
, 74b, since the signals have already passed through the band pass filter 72, there is no noise sufficient to cause an error.

The received signal is then sent to A/D converter 75.

The A/D converter 75 converts the signal from the detection matrix 20 into a digital signal in units of predetermined bits, such as 12 bits, for example, and records the received data in the bidirectional RAM 76 under the control of the sequence control circuit 47 (see FIG. 15). (see step 93), the processing speed is 2 per second.
This is a high speed of 5,000 times. The bidirectional RAM 76 is read by the CPU unit 3 in response to a write signal from the sequence control circuit 47.
After recording the received data regardless of the operation of 0, the address is increased by +1 by inputting 1 clock (
(See step 94 in FIG. 15) The capacity of the bidirectional RAM 76 is, for example, 2048 bytes.

The analog multiplexer 52 transfers the signals from each receiving line 26 that have passed through the CT sensor 51 to the channel switching logic 5.
4, and outputs sequentially at a predetermined period. The signal from the analog multiplexer 52 is sent to the amplifier 5
3, it is amplified 100 times (step 92 in Figure 15).
reference).

The received signal passes through the receiving connector 55, the amplifier 71, and the bandpass filter 72, and is amplified and filtered.

The received signal from the bandpass filter 2 is an analog signal in which one scan is several cycles, as shown in FIG. 16(A). This analog signal is subjected to waveform shaping in a full-wave rectifier/amplifier 73, as shown in FIG. 16(B).

The signal from the full-wave rectifier/amplifier 73 is averaged by integration processing by a low-pass filter 74a as shown in FIG. Averaging is performed as shown in D). As a result, the noise is also averaged with the received signal, but in this way, the analog multiplexer 52 of the receiving circuit 50 switches the signals from each receiving line 26 (815
3 according to the 32 receiving lines 26).
Repeat the above steps twice (see step 96 in Figure 15). After repeating 32 times, switch the analog multiplexer 44 of the transmitter circuit 40 or the transmission line 22 (see step 97 in Figure 15) and start signal processing again. Repeat.

The CPU unit 30 reads the data regarding the position of the pachinko balls recorded in the bidirectional RAM 76 according to the read start signal as necessary, and performs arithmetic processing.
The CPU unit 30 repeats this process. Each circuit of the CPU memory control board 172 and the CPU unit 30 perform the process while ignoring each other's waiting time. Therefore, the load on the CPU unit 30 is reduced, and the CPU unit 30 The processing speed can be increased.

Note that if the ball detection algorithm is simple, an inexpensive 8-bit CPU is sufficient for the CPU unit 30; if a complicated algorithm is required, high-speed processing is required. It is best to select one that uses a 16-bit CPU. In either case, the scanning speed of the pachinko ball is
Since it does not go through the PU, it is not affected by the CPU.

In this way, when a current is passed through the folded transmission line 22 to generate a magnetic field, and an electromotive force is generated by mutual induction in the reception line 26 which is electromagnetically coupled to the transmission line 22, the detection unit 20a detects a pachinko field. When a ball is hit, an eddy current is generated on the surface of the metal pachinko ball in a direction that cancels out the magnetic flux produced by the detection matrix 20. As a result, the impedance, which is the electromagnetic characteristic of the detection matrix 20, changes at that position, and the receiving line 26 changes the magnitude of the electromotive force.

At this time, the transmission lines 22, 22, . . . and the corresponding reception lines 26, 26, . . . can be detected by scanning.

Therefore, the position of the pachinko ball is between the receiving line 26.26 whose impedance has changed and the transmitting line 22.2 at that position.
As the coordinates of the intersection of 2... and .

can be grasped. The number of detection units 20a is 1024 in total, with 32 rows of transmitting lines 22 and 32 columns of receiving lines 26, so pachinko balls do not fall into which safe hole 14a of the board 11.
It can also be detected even if it passes through the out hole 15.

In addition, since the voltage waveform to the transmission line 22 is a continuous sine wave centered at 0, it does not generate noise like a square wave and prevents the influence on other devices such as the CPU unit 30. be able to.

Further, the transparent conductive film on the surface of the outer glass plate 17d has the effect of shielding the electrical influence of metals and dielectrics from the outside and increasing the reaction sensitivity to pachinko balls.

The CPU unit 30 has detection units 20a corresponding to important points such as the safe holes 14a, 14a, . . . and the out holes 15, which are recorded in the RAM card 173.

The data on the positions of 20a, . . . are read out, and the movement of the pachinko balls, such as the landing status of the pachinko balls on the board 11 of the pachinko game machine 10, is used as a change in coordinates to monitor the progress of the game. By knowing the status of balls entered, balls put out, etc., it is possible to manage the stopping of balls, check for abnormalities due to fraud, and use the data as data for adjusting nails, etc. When the RAM card 73 is used to monitor the status of pachinko balls in a new model of pachinko game machine 10, the RAM cart can be replaced accordingly.The RAM card 173 can be used in the same model of pachinko game machine IO. If used, one card can be copied and manufactured.

In addition, the transmitting connector 67a and the receiving connector 67 at the inner lower part of the mounting frame with the transmitting terminal 23 and the receiving terminal 27 facing downward.
In order to connect to b, the inner glass body (front glass) 17
The weight of the inner glass body 17 can be used to ensure the connection, and the connection can be made at the same time when the inner glass body 17 is attached to the mounting frame.

Furthermore, since the folded portions 61 of the transmission line 22 and the two reception lines are formed of a conductor pattern, the transmission line 22 and the reception line 26 are easy to manufacture, and the routing portion of the transmission line 22 and reception line 26 is Since 64 is formed of a metal pattern, manufacturing of the transmitting line 22 and the receiving line 26 is further facilitated.

Furthermore, since the transmission line 22 and the reception line 26 are made of wires 62, and their folded parts 61 and routing parts 64 are made of metal patterns, the wires 62 for detecting pachinko balls can be made thin. The detection part of the pachinko ball does not obstruct the board 11 of the pachinko game machine IO and is not noticeable to the players.

When the routing portions are formed on both sides of the routing board, the width of the routing portions can be easily shortened.

In addition, in the examples, one or both of the folding board and the routing board are flexible printed circuit boards (FPC).
) Alternatively, the glass epoxy board may be made of a thin glass epoxy board. Glass epoxy boards are milky white, so they are unnoticeable when in use, and are resistant to heat, making it difficult to solder the wires of the transmitting and receiving lines. At the same time, it is prevented from being destroyed by heat.

In addition, in the embodiment, the transmitting terminal and the receiving terminal are arranged concentrated at the lower end of the inner glass body (front glass) in vertical relation when attached to a pachinko game machine, but at the upper end of the inner glass body In this case, the transmitting connector 67a and the receiving connector 67b may be centrally arranged.

The transmitting circuit board 66a and the receiving circuit board 66b can be made inconspicuous.

In the embodiment, option 174 is for recording the movement of pachinko balls using any one of a hard disk, an optical disk, an optical/magnetic disk, an analog or digital tape recorder, or a videotape. There may be.

Furthermore, the transmission frequency may be switched between I MHz and 1.3 MHz, as well as other values of frequencies.

"Effects of the Invention" According to the filter circuit, metal detection device, and pachinko game machine according to the present invention, when the frequency of noise generated by a pachinko game machine, etc. matches or is close to the transmission frequency, pachinko In order to prevent the detection accuracy of metal such as balls from deteriorating, when transmitting by switching to a frequency that is not affected by noise between two types of frequencies, it is possible to support two types of transmission frequencies with a single filter circuit. Therefore, it is possible to make effective use of space and reduce the price by downsizing the metal detection device.

In particular, pachinko game machines can easily collect data such as the trajectory of pachinko balls on the board, the number of pachinko balls hit by players, and the rate of balls entering the safe hole without being affected by noise from the pachinko game machine. Since it is possible to obtain information quickly and to know the details of the game remotely, it is possible to raise the level of counting management of pachinko game machines, and anyone can easily adjust the nails of pachinko game machines. be able to.

[Brief explanation of the drawing]

1 to 17 show an embodiment of the present invention, and FIG. 1 is a circuit diagram showing a detailed configuration of a bandpass filter;
Fig. 2 is a conceptually exploded perspective view of the pachinko game machine and the detection matrix, Fig. 3 is a partial longitudinal sectional view of the pachinko game machine, Fig. 4 is a front view of the detection matrix, and Fig. 5
The figure shows an enlarged sectional view of the inner glass body with the detection matrix, Fig. 6 is a detailed front view of the transmission line, Fig. 7 is an enlarged sectional view of the transmission line showing the wire connection state, and Fig. 8 shows the transmission terminal. An enlarged front view, FIG. 9 is a perspective view showing the state in which the inner glass body is connected to the transmitting connector and the receiving connector, FIG. 10 is a schematic configuration diagram of the metal detection device, and FIG. 11 is the matrix I.
10 Block diagram of transmitter circuit of transmitter/receiver board, 12th
The figure is a block diagram showing the main parts of the channel switching logic, FIG. 13 is a block diagram of the receiving circuit of the matrix I10 transmitting/receiving board, and FIG. 14 is a block diagram of the receiving and transmitting circuits of the CPU memory control port. Fig. 15 is a flowchart of scanning the detection matrix, Fig. 16 is a waveform diagram showing signal processing of the received signal,
FIG. 17 is a graph illustrating adjustment of the transmission frequency. B... Pachinko ball 10... Pachinko game machine 11-... Board surface 13... Nail 14 a-
--Safe hole 15--Out hole 17--Inner glass body 19a, 29a---Folding board 19b, 29b--Leading board 20--Detection matrix 22--Transmission line 23--
・Transmission terminal 26...Reception line 27-...Reception terminal 30 = CPU: L neat 46
...CPU connector 47...Sequence control circuit 4 B-...Band pass filter 61-...Folding section 62-...Wire 64-...
- Routing section 67 a-... Transmission connector 67 b-... Reception connector 75-A/D converter 76... Bidirectional RAM 81... First capacitor 82... First resistor 83
...Transformer with trimmer 84...Second capacitor 85...Third capacitor 86...Second resistor 87...Third resistor Figure 3 Atsushi Higashiku 3 In Figure 17 (IFI glass body No. Figure 5 Figure 2b Figure 7 Figure Figure Figure Q Figure Figure Figure 3a Figure Figure Figure Figure Figure

Claims (1)

[Claims] 1. A first capacitor on the input side, a first resistor connected to the first capacitor on its output side, and a transformer with a trimmer connected to the first resistor on its output side. A filter circuit comprising: a primary side of the trimmer-equipped transformer having a second capacitor, and a secondary side thereof having a third capacitor and a second resistor. 2. A plurality of parallel folded transmission lines are attached to one side of the board, and a plurality of parallel folded reception lines whose electromagnetic characteristics change due to the proximity of metal are electromagnetically coupled in a direction crossing the transmission lines. Claim 1 for a transmission signal of the transmission circuit, comprising: a metal sensor disposed on the opposite surface of the substrate to form a planar detection matrix; a transmission circuit that sequentially transmits a signal of a predetermined frequency to each transmission line; A metal detection device comprising: the filter circuit described above; and a reception circuit that sequentially receives signals from each reception line in synchronization with the transmission circuit. 3. The metal detection device according to claim 2 is provided along the board surface,
A pachinko game machine, wherein the metal is a pachinko ball.