JP2005018301A - Coin identifying sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coin identifying sensor for surely identifying coins, and for extremely reliably identifying even forged coins by providing one arrangement of cores being a standard, and wounding coils around the cores according to its purpose. <P>SOLUTION: A primary core and a secondary core constituted of a ferromagnetic body are arranged across a coin passage, and a primary coil for excitation is wound around the primary core, and a secondary coil for transmission is wound around the secondary core, and secondary coils for reflection and transparent sections are respectively arranged on the coin passage faces of the primary core and the secondary core or their opposite faces of the coin passage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coin identification sensor suitable for a coin processing machine such as a coin sorting machine, a coin depositing and dispensing machine, a coin wrapping machine, etc., and in particular, by providing a plurality of channels and acquiring coin data, the denomination and authenticity of the coin can be determined. The present invention relates to a highly reliable coin identification sensor that can be identified stably and reliably.
[0002]
[Prior art]
For example, in a coin discriminating apparatus as disclosed in Japanese Patent No. 2567654, the surface is the same by exciting the oscillation coil at high and low frequencies and taking the sum of the output attenuation of each frequency output from the receiving coil. Coins are identified based on the fact that different clad coins (bimetal coins) and single structure coins can produce different outputs. However, such a conventional apparatus has a drawback that the clad coin cannot be reliably identified. This is because other types of single-material coins having the same output level as clad coins whose surface is white copper can exist.
[0003]
As a solution to such a problem, there is one disclosed in Japanese Patent Application Laid-Open No. 2000-11229. That is, the excitation coil and the reflection detection coil are composed of an eddy current loss detection type magnetic sensor having a coil configuration on the same side with respect to the coin to be detected, and the excitation coil is excited by combining at least three or more frequencies. The difference in the output of the reflection detection coil when there is no coin is divided by the output when there is no coin to determine the attenuation rate and identify the coin.
[0004]
[Patent Document 1]
Japanese Patent No. 2567654 [0005]
[Patent Document 2]
JP2000-11229
[0006]
[Problems to be solved by the invention]
According to the identification device described in Patent Document 2, not only the material of the coin but also the layer structure can be detected, so that the ability to identify the coin can be improved, but the reflection detection coil is wound around the protrusion of the excitation core. Therefore, there is a problem that the manufacturing process becomes complicated and the cost increases.
[0007]
In recent years, as the accuracy of counterfeit coins has increased, not only the identification ability but also the ability to eliminate counterfeit coins with high accuracy is required. According to the purpose, the number of sensor signals has increased, and the number of sensor heads has also increased. One sensor is desired to have a multifunctional and stable detection capability.
[0008]
The present invention has been made under the circumstances as described above, and the object of the present invention is to arrange the core as a reference, and by winding or arranging the coil according to the purpose, An object of the present invention is to provide a coin identification sensor that can be reliably and stably identified and that is highly reliable for identifying counterfeit coins.
[0009]
[Means for Solving the Problems]
The present invention relates to a coin identification sensor, and the object of the present invention is to provide a primary core and a secondary core made of a ferromagnetic material with a coin passage interposed therebetween, and a primary coil for excitation is wound around the primary core. Rotating and winding a secondary coil for transmission around the secondary core, and reflecting and transmitting portions on the coin path surface of the primary core and the secondary core or on the surface opposite to the coin path, respectively. This is achieved by providing a secondary coil.
[0010]
Further, the above object of the present invention is to provide the secondary coil for the reflective and transmissive portions as a winding, or to provide the secondary coil for the reflective and transmissive portions on a sheet or plate member. This is achieved more effectively by using a coil pattern or by separating the secondary core from the left and right with respect to the coin transport direction and winding a secondary coil for transmission on each.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the coin identification sensor of the present invention, the core is made of a ferromagnetic material, the width of the primary core is made larger than the passage width of the coin, the primary coil is wound to generate a uniform magnetic field with respect to the passage width, and the passage is sandwiched. A secondary core is disposed on the opposite side of the primary core. By doing so, an open loop of magnetic flux is formed, and an equivalent magnetic flux is obtained on the upper and lower surfaces of each core. In addition to the winding, the secondary coil for the reflective and transmissive portions may be a sheet or substrate (plate member) provided with a coil pattern (a plurality of coils may be provided). It arrange | positions on the channel | path surface of a secondary core, or the surface on the opposite side to a channel | path.
[0012]
The secondary coil (for reflection) arranged in the primary core acquires a reflection signal from the coin, and the secondary coil (transmission part) arranged in the secondary core acquires a transmission signal of the coin. The secondary coils for the reflective and transmissive parts are provided on the surface opposite to the coin path surface of the primary core and the secondary core. Even if a secondary coil is provided in a part away from the coin, a good output can be obtained. For this reason, space restrictions are reduced, and the design can be easily changed according to the detection information position of the coin. Therefore, it is easy to deal with new coins and counterfeit coins with one reference sensor (core position).
[0013]
Further, in the present invention, a plurality of detection signals are acquired from the coins to be conveyed for identification processing, but since a single primary coil is used, a stable signal is acquired without causing crosstalk. This improves the coin identification accuracy. Furthermore, the characteristics of the wide part of the coin with respect to one primary coil are acquired by the secondary coils (transmission L, R) wound around the secondary core, and the local characteristics are the core surface (passage surface or passage and It can be obtained simultaneously from the secondary coil attached to the opposite surface), and the identification accuracy is improved efficiently.
[0014]
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 schematically shows the structure of a coin identification sensor of the present invention, in which a primary core 10 and secondary cores 20 and 30 are arranged across a coin passage 1 through which a coin to be identified is conveyed. In this example, the secondary cores 20 and 30 are separated on the left and right. The primary core 10 and the secondary cores 20 and 30 are made of a ferromagnetic material such as magnetic ferrite, sendust, and iron-based thin laminated plate, and are housed in a sensor case 2 made of a cured resin or the like. A wear resistant resin or the like is layered on the passage surface. A primary coil 11 for excitation is wound around the primary core 10 and is excited by an oscillation circuit (100) that outputs a combined signal of high frequency (for example, several hundreds KHz) and low frequency (for example, several KHz). Further, a secondary coil (transmission L) 21 is wound around the secondary core 20, and a secondary coil (transmission R) 31 is wound around the secondary core 30, and outputs a transmission L signal and a transmission R signal, respectively. To do.
[0016]
Further, a secondary coil 12 that detects a reflection component from a coin is provided on the lower surface of the primary core 10, and a secondary coil 32 that detects a transmissive portion of the coin is provided on the upper surface of the secondary core 30. It has been. The secondary coils 12 and 32 are provided by being fixed with an epoxy-based adhesive or molded with a silicon resin. In the example of FIG. 1, coins are conveyed in contact with the right side of the coin passage 1, and therefore the secondary core 32 is provided on the right secondary core 30. The secondary core 20 is provided with the secondary coil 32 when it is transported in contact with the left side of the core.
[0017]
When the primary coil 11 is excited, a magnetic flux as indicated by a broken line in FIG. 2 is generated from the primary core 10, and as is apparent from this magnetic flux line, each of the primary core 10 and the secondary cores 20, 30 is located above. On the bottom surface, the amount of magnetic flux input / output is equivalent. Accordingly, the secondary coil (reflection) 12 may be provided anywhere on the upper and lower surfaces of the primary core, and the secondary coil (transmission portion) 32 may be provided anywhere on the upper and lower surfaces of the secondary core 30 (or the secondary core 20). Also good. Further, the secondary coils 12 and 32 do not have to be in contact with the surfaces of the primary core 10 and the secondary core 30 (or the secondary core 20), respectively, as long as they are installed in the vicinity, and are the same on both the upper and lower surfaces. The state magnetic flux can be supplemented.
[0018]
Next, a circuit connection for identifying a coin by driving the coin identification sensor of the present invention will be described with reference to FIG. The oscillation circuit 100 that outputs a high-frequency and low-frequency combined signal excites the primary coil 11, and the transmission L signal from the secondary coil (transmission L) 21 is amplified through a filter and rectifier circuit 111 to extract high-frequency components. The amplified signal is input to the circuit 121, converted into a digital quantity by the A / D converter 130, and input to the arithmetic processing unit (CPU) 131, and is also amplified through the filter and rectifier circuit 112 for low frequency component extraction. The amplified signal is input to the circuit 122, converted into a digital quantity by the A / D converter 130, and input to the arithmetic processing unit 131. The transmitted R signal from the secondary coil (transmitted R) 31 is input to the amplifier circuit 123 through the filter and rectifier circuit 113 for high frequency component extraction, and the amplified signal is converted into a digital quantity by the A / D converter 130. In addition to being input to the arithmetic processing unit 131, a low frequency component is extracted and input to the amplifier circuit 124 through the filter and rectifier circuit 114, and the amplified signal is converted into a digital quantity by the A / D converter 130, and the arithmetic processing unit 131 is input.
[0019]
Further, the transmission portion signal from the secondary coil (transmission portion) 32 is input to the amplification circuit 125 through the filter and rectification circuit 115 to extract high frequency components, and the amplified signal is converted into a digital quantity by the A / D converter 130. And is input to the arithmetic processing unit 131 and input to the amplifier circuit 126 through the filter and rectifier circuit 116 for extracting the low frequency components, and the amplified signal is converted into a digital quantity by the A / D converter 130 and operated. The data is input to the processing unit 131. The reflected signal from the secondary coil (reflection) 12 is input to the amplifier circuit 127 through the filter and rectifier circuit 117 to extract high frequency components, and the amplified signal is converted into a digital quantity by the A / D converter 130 and processed. In addition to being input to the unit 131, a low frequency component is extracted and then input to the amplifier circuit 128 through the filter and rectifier circuit 118. The amplified signal is converted into a digital quantity by the A / D converter 130 and then input to the arithmetic processing unit 131. Entered.
[0020]
An example of the operation of the configuration as described above will be described.
[0021]
FIGS. 4A to 4G show examples of waveforms of the detection signals, which are waveforms after filtering and rectification. 4A shows the transmission L output (high frequency) from the secondary coil 21, and the transmission L output (low frequency) is FIG. 4B. FIG. 4C shows the transmission R output (high frequency) from the secondary coil 31, and the transmission R output (low frequency) is FIG. 4D. The reflected output (high frequency) from the secondary coil 12 is shown in FIG. 4 (E), and the reflected output (low frequency) is shown in FIG. 4 (F). The output signal of the transmission part from the secondary coil 32 is shown in FIG. Such multi-channel output signals are obtained in advance for various coins and stored in a memory (not shown), and the coins are identified in comparison with the actual output signals of the coins to be identified.
[0022]
For the multi-channel output signal as described above, the arithmetic processing unit 131 executes the following identification process by comparing with the data stored in the memory. The high-frequency output of the transmitted L signal is used for shape identification, and the low-frequency output of the transmitted L signal is used for material and shape identification. The high-frequency output of the transmitted R signal is used for shape identification, and the low-frequency output of the transmitted R signal is used for material and shape identification. Further, the coin diameter is identified by the high frequency output of the transmission L signal and the high frequency output of the transmission R signal, and the coin diameter and material are identified by the low frequency output of the transmission L signal and the low frequency output of the transmission R signal. The high frequency output of the reflected signal is used for identifying the coin surface, the low frequency output of the reflected signal is used for identifying the material, and the material and thickness are identified by the output of the transmitted partial signal.
[0023]
In the above-described embodiment, the secondary coils 12 and 32 are provided by winding on the surfaces of the primary core 10 and the secondary core 30 (or 20). However, a coil board provided with a coil pattern is used. It is also possible to do. FIG. 5 shows an example, in which a coil 41 made of a coil pattern is layered on a rectangular plate-like printed board 40, and a coil 45 (or 43) made of a coil pattern is formed on a rectangular plate-like printed board 44 (or 42). ) Is layered. If these printed circuit boards 40, 42 and 44 are bonded to the surfaces of the primary core 10 and the secondary cores 20 and 30, respectively, a secondary coil for reflection and transmission can be formed. When the secondary coil is provided on the printed circuit board in this way, the printed circuit board can be easily replaced by providing the terminal pattern 45 that allows the output to be taken out by fitting the board into the sensor socket. It can change into the sensor which can obtain the sensor signal of the specific part of a coin. Further, if the printed board has a wear resistance function, a board provided with a secondary coil on the coin passage surface side may be arranged.
[0024]
The number of primary cores and primary coils is preferably one, but may be plural. Further, in the embodiment, the secondary core is separated into the left and right to make it easier to install the conveyor belt, but the secondary core may be made one and removable.
[0025]
In addition, although there are two types in the above, if a primary coil is excited by synthesizing three or more types of multiple frequencies, it is possible to detect even a local layer structure in addition to characteristics such as the material and diameter of the coin. .
[0026]
【The invention's effect】
As described above, according to the coin identification sensor of the present invention, not only the material of the coin but also the layer structure can be detected, so the authenticity of the coin is further improved. Therefore, the clad coin can be reliably identified. In addition, since the present invention utilizes the fact that the magnetic flux is equivalent to the upper and lower surfaces of each core, the space restriction on the installation of the secondary coil is reduced, and the design can be easily changed according to the coin detection information position. In addition, it is easy to handle new coins and counterfeit coins with one reference sensor (core position). Thus, there is one core arrangement as a reference, and there is an advantage that the coil installation position can be set according to the purpose. Furthermore, it is possible to cope with the change of the coil portion instead of the design change of the entire sensor.
[0027]
In the present invention, coin detection signals are acquired by multi-channel and identification processing is performed, and since the primary coil is one, a stable signal can be acquired without crosstalk, Identification accuracy can be improved. Furthermore, the characteristics of the wide part of the coin with respect to one primary coil are acquired by the secondary coils (transmission L, R) wound around the secondary core, and the local characteristics are the core surface (passage surface or passage and Since it is simultaneously acquired from the secondary coil provided on the opposite surface), the identification accuracy can be improved efficiently.
[Brief description of the drawings]
FIG. 1 is a connection structure diagram showing a structural example of a coin identification sensor according to the present invention.
FIG. 2 is a diagram for explaining the principle of a coin identification sensor according to the present invention.
FIG. 3 is a block diagram showing an example of a drive detection circuit of a coin identification sensor according to the present invention.
FIG. 4 is a characteristic diagram showing an operation example of the present invention.
FIG. 5 is a diagram showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coin channel | path 2 Sensor case 10 Primary core 11 Primary coil 12 Secondary coil (reflection)
20 Secondary core (L)
21 Secondary coil (transmission L)
30 Secondary core (R)
31 Secondary coil (transmission R)
32 Secondary coil (transmission part)
100 Oscillation circuit 130 A / D converter 131 Arithmetic processing unit (CPU)

Claims (4)

A primary core and a secondary core made of a ferromagnetic material are disposed across a coin path, a primary coil for excitation is wound around the primary core, and a secondary coil for transmission is wound around the secondary core. In addition to being wound, a secondary coil for reflecting and transmitting portions is provided on the coin passage surface of the primary core and the secondary core or on the surface opposite to the coin passage, respectively. A coin identification sensor. The coin identification sensor according to claim 1, wherein the secondary coil for reflection and transmission is a winding. The coin identification sensor according to claim 1, wherein the secondary coil for reflection and transmission is a coil pattern provided on a sheet or a plate-like member. The coin identification sensor according to any one of claims 1 to 3, wherein the secondary core is separated to the left and right with respect to a coin transport direction, and a secondary coil for transmission is wound around each of the secondary cores.

Images