JP2022026435A - Detection device, coin discrimination device, and detection program - Google Patents

Abstract

To provide a technique that can reduce manufacturing cost of a magnetic sensor and space in which the magnetic sensor is mounted when a detection object is detected by both a transmissive magnetic sensor and a reflective magnetic sensor.SOLUTION: A detection device includes: a first coil arranged at a position capable of generating magnetic flux passing through a detection range where a detection object is detected; a second coil arranged at a position capable of detecting the magnetic flux generated by the first coil and having passed through the detection range; an input unit connected to at least the first coil; and an output unit connected to the first coil and the second coil. The input unit excites the first coil to generate magnetic flux in a first state. The output unit causes the second coil to detect the magnetic flux in the first state and causes the first coil to detect magnetic flux.SELECTED DRAWING: Figure 1

Description

The present invention relates to a detector, a coin discriminator and a detection program.

In general, as the main technology for detecting the characteristics (for example, the outer diameter, material or thickness of the detection target) of the detection target (for example, coin), the technology using a magnetic sensor and the technology using an optical sensor are used. be. As the magnetic sensor, a rod-shaped, E-shaped or U-shaped ferrite core in which a coil is wound is often used. When a magnetic sensor is used, a magnetic field is generated by passing a current through the coil of the magnetic sensor, and the detection target is being conveyed before (hereinafter, also referred to as “non-medium state”) and during transportation (hereinafter, “with medium”). A technique for detecting a feature to be detected based on a change in the magnetic field between the state and the state) is often used.

There are two types of magnetic sensor methods: transmission type and reflection type. The transmissive type uses two coils as a set. Then, one of the two coils is arranged below the transport path, and the other coil is disposed above the transport path. That is, the two coils are arranged at positions facing each other vertically with the transport path interposed therebetween. At this time, one coil functions as a transmitting side for generating magnetic flux, and the other coil functions as a receiving side for detecting magnetic flux. As a result, a change in the magnetic field in the section sandwiched between the two coils is detected. On the other hand, in the reflective type, one coil functions as a transmitting side and a receiving side.

Japanese Patent Application Laid-Open No. 2003-6700

Here, both a transmission type magnetic sensor and a reflection type magnetic sensor may be used for detecting the detection target. At this time, it is general that the transmission type magnetic sensor and the reflection type magnetic sensor are provided independently (that is, as two pairs of coils). However, if the transmission type magnetic sensor and the reflection type magnetic sensor are provided independently, the manufacturing cost of the magnetic sensor increases and the space for mounting the magnetic sensor also increases.

Therefore, when the detection target is detected by both the transmission type magnetic sensor and the reflection type magnetic sensor, it is possible to reduce the manufacturing cost of the magnetic sensor and the space for mounting the magnetic sensor. Is desired to be provided.

In order to solve the above problem, according to a certain aspect of the present invention, a first coil arranged at a position where a magnetic flux passing through a detection range in which a detection target is detected can be generated, and the first coil are used. A second coil arranged at a position where the magnetic flux generated and passed through the detection range can be detected, an input unit connected to at least the first coil, and the first coil and the second coil. The input unit comprises an output unit connected to the first state, and the input unit excites the first coil to generate a magnetic flux, and the output unit generates a magnetic flux in the first state. A detection device is provided that causes a second coil to detect a magnetic flux and causes the first coil to detect a magnetic flux.

The input unit excites the second coil to generate a magnetic field in a second state different from the first state, and the output unit generates the magnetic field in the second state. May detect the magnetic flux.

In the second state, the output unit may cause the second coil to detect the magnetic flux and the first coil to detect the magnetic flux.

In the first state, the input unit generates a magnetic flux in the first coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor, and the detection device. Acquires the detection signal of the transmissive sensor in the first state based on the detection result by the second coil in the first state, and also by the first coil in the first state. An acquisition unit may be provided to acquire the detection signal of the reflection type sensor in the first state based on the detection result.

In the first state, the input unit generates a magnetic flux in the first coil based on an excitation signal common to the transmission type sensor and the reflection type sensor, and the output unit is in the first state. The detection result by the second coil is output as the detection signal of the transmission type sensor in the first state, and the detection result by the first coil in the first state is the reflection type in the first state. It may be output as a detection signal of.

In the first state, the input unit generates a magnetic flux in the first coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor, and the detection device. Acquires the detection signal of the transmissive sensor in the first state based on the detection result by the second coil in the first state, and also by the first coil in the first state. The input unit includes an acquisition unit that acquires the detection signal of the reflection type sensor in the first state based on the detection result, and the input unit is said to be based on the excitation signal of the reflection type sensor in the second state. A magnetic flux is generated in the second coil, and the acquisition unit acquires the detection signal of the reflection type sensor in the second state based on the detection result by the second coil in the second state. May be good.

In the first state, the input unit generates a magnetic flux in the first coil based on an excitation signal common to the transmission type sensor and the reflection type sensor, and the output unit is in the first state. The detection result by the second coil is output as a detection signal of the transmission type sensor in the first state, and the detection result by the first coil in the first state is the reflection type in the first state. It is output as a detection signal of the sensor, the input unit generates a magnetic flux in the second coil based on the common excitation signal in the second state, and the output unit is in the second state. The detection result by the second coil may be output as a detection signal of the reflection type sensor in the second state.

In the second state, the input unit generates a magnetic flux in the second coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor. The acquisition unit acquires the detection signal of the reflection type sensor in the second state based on the detection result by the second coil in the second state, and the acquisition unit obtains the detection signal of the reflection type sensor in the second state and the first in the second state. Based on the detection result by the coil, the detection signal of the transmission type sensor in the second state may be acquired.

The input unit generates a magnetic flux in the second coil based on the common excitation signal in the second state, and the output unit is a detection result by the second coil in the second state. Is output as a detection signal of the reflection type sensor in the second state, and the detection result by the first coil in the second state is output as a detection signal of the transmission type sensor in the second state. You may.

The detection device may include a processing unit that derives the characteristics of the detection target based on the detection signal of the transmission type sensor in the first state and the detection signal of the reflection type sensor in the first state. good.

The processing unit derives the first position of the detection target based on the detection signal of the transmission type sensor in the first state, and the reflection type in the first state based on the first position. The detection signal of the sensor may be corrected, and the feature of the detection target may be derived based on the detection signal of the reflection type sensor in the first state after the correction.

The detection device includes a detection signal of the transmissive sensor in the first state, a detection signal of the reflective sensor in the first state, and a detection signal of the reflective sensor in the second state. Based on this, a processing unit for deriving the characteristics of the detection target may be provided.

The processing unit derives the first position of the detection target based on the detection signal of the transmission type sensor in the first state, and the first position is based on the first position and the first attenuation rate. The reflection type in the second state is corrected based on the detection signal of the reflection type sensor in one state and based on the first position and the second attenuation rate different from the first attenuation rate. The detection target of the detection target is corrected based on the detection signal of the reflection type sensor in the first state after correction and the detection signal of the reflection type sensor in the second state after correction. Features may be derived.

The detection device includes a detection signal of the transmission type sensor in the first state, a detection signal of the reflection type sensor in the first state, and a detection signal of the transmission type sensor in the second state. A processing unit for deriving the characteristics of the detection target may be provided based on the detection signal of the reflection type sensor in the second state.

The processing unit derives the first position of the detection target based on the detection signal of the transmission type sensor in the first state, and the first position is based on the first position and the first attenuation rate. The detection signal of the reflection type sensor in one state is corrected, and the second position of the detection target is derived based on the detection signal of the transmission type sensor in the second state. The detection signal of the reflection type sensor in the second state is corrected based on the second attenuation rate different from the first attenuation rate, and the corrected reflection type sensor in the first state is corrected. The feature of the detection target may be derived based on the detection signal and the detection signal of the reflection type sensor in the second state after correction.

The second state may be a state before the detection target has moved by a predetermined distance from the first state, or a state after the detection target has moved by a predetermined distance.

The detection target may be a plate-shaped object.

The feature of the detection target may be the thickness of the detection target.

The detection target may be a coin.

Further, in order to solve the above-mentioned problems, according to another aspect of the present invention, at least the computer is placed in a first coil arranged at a position where a magnetic flux that reaches the detection range in which the detection target is detected can be generated. An input unit to be connected, a second coil arranged at a position where a magnetic flux generated by the first coil and passing through the detection range can be detected, and an output unit connected to the first coil. This is a detection program that functions as a control unit for controlling the above, and the control unit controls the input unit so as to excite the first coil to generate a magnetic flux in the first state, and the first A detection program is provided that controls the output unit so that the second coil detects the magnetic flux and the first coil detects the magnetic flux.

As described above, according to the present invention, when the detection target is detected by both the transmission type magnetic sensor and the reflection type magnetic sensor, the manufacturing cost of the magnetic sensor is reduced and the magnetic sensor is mounted. Technologies that can reduce space are provided.

It is explanatory drawing which showed the appearance structure of the change machine which concerns on this embodiment. It is a schematic side view which shows the mechanism of a coin change machine. It is a perspective view which shows the appearance of the coin discrimination apparatus which a change machine has. It is a top view of the coin discrimination apparatus in the state where the sensor fixing part is removed. It is a top view of a general coin discrimination apparatus in a state where a sensor fixing part is removed. It is sectional drawing of the coin discrimination apparatus along the line BB of FIG. It is a figure for demonstrating the outline of 1st Embodiment. It is a figure which shows the structural example of the detection apparatus which concerns on 1st Embodiment. It is a figure for demonstrating an example of processing of an analog adder circuit. It is a figure for demonstrating an example of processing of analog LPF and analog HPF. It is a flowchart which shows the operation example of the control part which concerns on 1st Embodiment. It is a figure which shows the example of the relationship with the sensor output with respect to the lateral displacement amount. It is a figure which shows the correction example of the sensor output which concerns on 1st Embodiment. It is a figure which shows the example of the relationship between the sensor output of the material thickness sensor from the upper side sensor and the sensor output of a material thickness sensor from a lower side sensor which concerns on 1st Embodiment. It is a figure for demonstrating the outline of the 2nd Embodiment. It is a figure which shows the structural example of the detection apparatus which concerns on 2nd Embodiment. It is a flowchart which shows the operation example of the control part which concerns on 2nd Embodiment. It is a figure which shows the correction example of the sensor output which concerns on 2nd Embodiment. It is a figure which shows the example of the relationship between the sensor output of the material thickness sensor from the upper side sensor and the sensor output of a material thickness sensor from a lower side sensor which concerns on 2nd Embodiment. It is a figure which shows the structural example of the detection apparatus which concerns on the modification of 1st Embodiment. It is a flowchart which shows the operation example of the control part which concerns on the modification of 1st Embodiment. It is a figure which shows the structural example of the detection apparatus which concerns on the modification of 2nd Embodiment. It is a flowchart which shows the operation example of the control part which concerns on the modification of 2nd Embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

Further, in the present specification and the drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different numbers after the same reference numerals. However, if it is not necessary to distinguish each of a plurality of components having substantially the same functional configuration, only the same reference numerals are given. Further, similar components of different embodiments may be distinguished by adding different alphabets after the same reference numerals. However, if it is not necessary to distinguish each of the similar components of different embodiments, only the same reference numerals are given.

<< 1. Basic configuration >>
Hereinafter, a coin will be mainly described as an example of a detection target detected by the detection device according to the embodiment of the present invention. However, the detection target is not limited to coins, and may be other objects. For example, the detection target detected by the detection device may be a plate-shaped object (a coin is also an example of a plate-shaped object). If the detection target is a plate-shaped object, the features of the detection target can be detected with higher accuracy by the magnetic sensor as compared with the case where the detection target is an object having another shape.

Further, in the following, it is mainly assumed that the detection target moves. In particular, when the detection target is a coin, the detection target is conveyed by the conveyor belt. However, the detection target does not necessarily have to be an object to be transported, and may be an object that moves by itself. Alternatively, the detection target does not necessarily have to be a moving object.

A change machine (an example of a coin processing machine) according to an embodiment of the present invention is installed in a cash register checkout counter of a retail store such as a department store, a supermarket, a convenience store, etc., and is used in a POS (Point Of Sales) register or the like. Connected to process deposits and withdrawals. However, the place where the change machine is installed is not limited. In the following, first, the basic configuration of the change machine according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is an explanatory diagram showing an external configuration of a change machine 1 according to the present embodiment. As shown in FIG. 1, the change machine 1 according to the present embodiment includes a bill change machine 2 and a coin change machine 3, and is connected to a POS register 4. Further, as shown in FIG. 1, the change machine 1 is provided with a deposit port 5, a withdrawal port 6, and a reject unit 7 on the left side of the front surface of the device, and an operation display unit 9, a collection cassette unit 19, and a bill on the right side of the front surface of the device. A deposit / withdrawal port 20 is provided.

The deposit slot 5 is a slot into which coins received from customers by a cashier in charge of cashiers are inserted. The withdrawal port 6 is a receiving port for paying out coins to be paid as change to the customer.

The reject unit 7 stores coins that are determined to be unacceptable (rejected). As shown in FIG. 1, the reject unit 7 has a reject door 33, and when the reject door 33 is opened, a reject storage unit (not shown) for storing rejected coins is opened. Further, a lock 34 is provided on the upper portion of the reject door 33, and by locking the lock 34, the reject door 33 can be set so as not to open.

The operation display unit 9 has an operation unit 91 such as a key used by a staff member in charge of cash register for input, and a display unit 92 for displaying the contents input by the staff member and information on the device.

The collection cassette unit 19 is a banknote cassette for collecting and storing banknotes stored inside the banknote change machine 2. The banknote deposit / withdrawal port 20 is a banknote deposit / withdrawal port for depositing banknotes received from a customer and paying out banknotes to be paid to the customer as change.

FIG. 2 is a schematic side view showing the mechanism of the coin change machine 3. As shown in FIG. 2, the coin change machine 3 has a deposit port 5 for depositing coins received from a customer, a sensor 31 provided in the deposit port 5, and a withdrawal port 6 for withdrawing change coins. 1 yen hopper 21, 50 yen hopper 22, 5 yen hopper 23, 100 yen hopper 24, 10 yen hopper 25, 500 yen hopper 26, and the denomination of the deposited coins, which store the deposited coins for each denomination. It has a coin discriminating device 100 for discriminating authenticity and the like, a deposit transport path 28 in which the coin discriminating device 100 is arranged, a reject storage unit 29, and a withdrawal transport path 30. Further, the deposit transfer path 28 and the withdrawal transfer path 30 are driven by the motor 32.

The change machine 1 (an example of a coin processing machine) according to the embodiment of the present invention has been described above. Subsequently, the coin discrimination device 100 included in the change machine 1 will be described.

<< 2. Configuration of coin discrimination device >>
FIG. 3 is a perspective view showing the appearance of the coin discrimination device 100 included in the change machine 1. FIG. 4 is a top view of the coin discrimination device 100 in a state where the sensor fixing portion 130 (FIG. 3) is removed. FIG. 5 is a top view of a general coin discriminating device 900 in a state where the sensor fixing portion is removed. FIG. 6 is a cross-sectional view of the coin discriminating device 100 along the line BB of FIG. As shown in FIG. 3, the coin discrimination device 100 includes a transport path 102, a transport belt 104 which is an example of a transport member, and a transport reference member 112.

The transport path 102 has a transport surface 103 on which the coin C is transported in the transport direction. That is, the coin C is transported in the transport direction along the transport surface 103.

The transport belt 104 is arranged above the transport path 102, and transports the coin C on the transport path 102 in the transport direction.

The transport reference member 112 is formed on one end side of the transport path 102 along the transport belt 104, and regulates the transport position of the coin C in the width direction of the transport path 102 (X direction shown in FIGS. 3 and 4). It is a guide part to do. The transport reference member 112 has a transport reference surface 113 (guide surface) that guides the coin C transported by the transport belt 104. That is, the coin C is transported in the transport direction along the transport reference surface 113 while being abutted against the transport reference surface 113 by the transport force applied by the transport belt 104.

Here, in order to make it easier to understand the characteristics of the coin discriminating device 100 according to the embodiment of the present invention, a general coin discriminating device 900 will be briefly described with reference to FIG.

With reference to FIG. 5, a top view of a general coin discriminator 900 is shown. The coin discrimination device 900 includes a material thickness sensor (combination of an upper material thickness sensor 171 and a lower material thickness sensor 172) and a width adjustment sensor 181 as an example of a magnetic sensor that detects the characteristics of a coin. In addition, the coin discrimination device 900 has an outer diameter sensor (combination of a receiving side outer diameter sensor 141 and a transmitting side outer diameter sensor 142) and a material sensor (receiving side) as examples of other magnetic sensors that detect the characteristics of coins. A combination of the material sensor 161 and the transmitting side material sensor 162) is provided.

Generally, as shown in FIG. 5, the transport belt 104 is arranged closer to the transport reference surface 113 than near the center of the coin C to be transported while being in contact with the transport reference surface 113. Therefore, the lumber thickness sensor (combination of the upper lumber thickness sensor 171 and the lower lumber thickness sensor 172) can be arranged above and below the position where the vicinity of the center of the coin C passes. As a result, even if the coin C is separated from the transport reference surface 113, the material sensor (upper material thickness sensor 171 and lower material) is the same as when the coin C is transported while being in contact with the transport reference surface 113. By the combination with the thickness sensor 172), the material thickness (that is, the thickness) of the coin C can be detected with high accuracy. In this example, the lumber thickness sensor is a transmissive magnetic sensor.

Further, the width alignment sensor 181 (shift amount detection sensor) detects the shift amount of the coin C with respect to the transport reference surface 113 (hereinafter, also referred to as “lateral shift amount”). The amount of deviation of the coin C with respect to the transport reference surface 113 is used to correct the outer diameter of the coin C detected by the outer diameter sensor (combination of the receiving side outer diameter sensor 141 and the transmitting side outer diameter sensor 142). obtain. In order to detect the amount of deviation of the coin C with respect to the transport reference surface 113, the width adjustment sensor 181 may be arranged above or below the vicinity of the transport reference surface 113. Generally, since the transport belt 104 is arranged above the transport path 102, the width alignment sensor 181 is arranged below the transport path 102 in order to avoid interference with the transport belt 104. In this example, the width-alignment sensor 181 is a reflection type magnetic sensor.

As described above, in general, the material thickness sensor (combination of the upper material thickness sensor 171 and the lower material thickness sensor 172) is arranged above and below the position where the vicinity of the center of the coin C passes, and the width is adjusted. The sensor 181 is arranged below the vicinity of the transport reference surface 113. Therefore, the material thickness sensor (combination of the upper material thickness sensor 171 and the lower material thickness sensor 172) and the width adjustment sensor 181 have to be provided independently, which increases the manufacturing cost of the magnetic sensor and increases the manufacturing cost. There is a situation that the space for mounting the magnetic sensor is also widened.

It is assumed that the transport belt 104 is arranged above the position where the vicinity of the center of the coin C passes in order to improve the transport performance of the coin C. In such a case, the material thickness sensor (combination of the upper material thickness sensor 171 and the lower material thickness sensor 172) is placed above the position where the center of the coin C passes and in order to avoid interference with the transport belt 104. It will not be placed below. For example, if the material thickness sensor (combination of the upper material thickness sensor 171 and the lower material thickness sensor 172) is arranged on the transport reference surface 113 side from the position where the vicinity of the center of the coin C passes, it is generated from the material thickness sensor. Since the area of the coin C applied to the magnetic flux is changed, the characteristics (material thickness) of the coin C detected by the material thickness sensor become unstable.

Therefore, in the present embodiment, as will be described later, the detection device included in the coin discrimination device 100 includes a magnetic sensor. The magnetic sensor includes a first coil and a second coil. The first coil is arranged at a position where a magnetic flux that passes through the detection range in which the coin C is detected (here, a part of the transport path 102) can be generated. Then, the second coil is arranged at a position where the magnetic flux generated by the first coil and passing through the detection range can be detected. The detection range may be appropriately set for a part or all of the region where the detection target can exist (here, the transport path 102 and may include the region where the detection target can move).

In the following, it is mainly assumed that the first coil is a coil arranged below the transport path 102 and the second coil is a coil arranged above the transport path 102. Therefore, in the following, the first coil is also referred to as a "lower sensor" (lower sensor 192 shown in FIG. 4), and the second coil is also referred to as an "upper sensor" (upper sensor 191 shown in FIG. 4). .. However, the first coil may be located above the transport path 102 (ie, may function as the "upper sensor" described below) and the second coil may be located below the transport path 102. It may (ie, act as the "lower sensor" described below).

In addition, the detection device includes at least an input unit connected to the lower sensor 192 and an output unit connected to each of the lower sensor 192 and the upper sensor 191. The input unit excites the lower sensor 192 to generate a magnetic flux. The output unit causes the upper sensor 191 to detect the magnetic flux generated by the lower sensor 192, and causes the lower sensor 192 to detect the magnetic flux generated by the lower sensor 192.

According to such a configuration, a transmission type magnetic sensor can be realized by a combination of a lower sensor 192 that generates a magnetic flux and an upper sensor 191 that detects a magnetic flux. Then, a reflection type magnetic sensor can be realized by the lower sensor 192 that generates the magnetic flux and detects the magnetic flux. That is, since the transmission type magnetic sensor and the reflection type magnetic sensor can be realized by the upper sensor 191 and the lower sensor 192, the manufacturing cost of the magnetic sensor is reduced and the space for mounting the magnetic sensor is reduced. It becomes possible to do.

In the following, it is assumed that a width sensor is used as an example of a transmission type magnetic sensor realized by a combination of the lower sensor 192 and the upper sensor 191. However, the transmissive magnetic sensor realized by the combination of the lower sensor 192 and the upper sensor 191 is not limited to the width-alignment sensor. On the other hand, as an example of the reflection type magnetic sensor realized by the lower sensor 192, it is assumed that a lumber thickness sensor is used.

However, the output of the upper sensor 191 may change depending on the distance between the upper sensor 191 and the upper surface of the coin C. However, the distance between the upper sensor 191 and the upper surface of the coin C can change not only by the thickness of the coin C but also by how much the coin C floats from the transport path 102 (that is, the degree of coin floating). Therefore, considering that the output of the lower sensor 192 is also affected by the coin float, like the output of the upper sensor 191, the coins are based on the relative relationship between the outputs of the upper sensor 191 and the lower sensor 192. It is desirable that the material thickness of C is detected.

That is, the material thickness sensor is realized by the combination of the lower sensor 192 and the upper sensor 191, and the sensor (which both generates and detects the magnetic flux) is switched between the lower sensor 192 and the upper sensor 191. desirable. The reflection type magnetic sensor realized by the lower sensor 192 is also not limited to the material thickness sensor. For example, the reflection type magnetic sensor realized by the lower sensor 192 may be a magnetic sensor that detects some feature other than the material thickness of the coin C.

Further, the detection signal (sensor output) detected by the reflection type magnetic sensor can be corrected based on the lateral displacement amount detected by the width-alignment sensor. As a result, the transport belt 104 is placed above the position where the vicinity of the center of the coin C passes, and the material thickness sensor is placed closer to the transport reference surface 113 than the position where the vicinity of the center of the coin C passes. Since it is possible to prevent the area of the coin C applied to the magnetic flux generated from the coin C from changing, it is possible to suppress a decrease in the detection accuracy of the characteristics (material thickness) of the coin C. Moreover, since the transport belt 104 can be arranged above the position where the vicinity of the center of the coin C passes, it is possible to improve the transport performance of the coin C.

In this embodiment, the transport belt 104 can be passed above the center of the coin C. Therefore, the transport belt 104 may be configured by a pin belt. A pin 105 (projection) is formed on the surface of the pin belt on the transport path 102 side, and the transport belt 104 rotates in the transport direction in a state where the pin 105 is in contact with the coin C, so that the coin C (protrusion) is formed by the pin 105. When the transport belt 104 passes above the center of the coin C, a force (transport force) in the transport direction is applied (near the center of the outer diameter of the coin C). As a result, the transport performance of the coin C is further enhanced.

However, the pin 105 may not be formed on the transport belt 104. That is, the transport belt 104 may apply a frictional force to the coin C as a transport force by rotating in the transport direction with the coin C sandwiched between the transport belt 104 and the transport surface 103.

The coin discrimination device 100 includes these magnetic sensors (that is, a combination of the upper sensor 191 and the lower sensor 192), the width adjustment sensor 181 and the outer diameter sensor (reception side outer diameter sensor 141 and transmission side outer). It also includes a diameter sensor 142) and a material sensor (a combination of the receiving side material sensor 161 and the transmitting side material sensor 162). In the present embodiment, it is mainly assumed that each of the outer diameter sensor and the material sensor is a transmission type magnetic sensor, but it may be a reflection type magnetic sensor.

As shown in FIG. 6, the combination of the upper sensor 191 and the lower sensor 192, the combination of the receiving side outer diameter sensor 141 and the transmitting side outer diameter sensor 142, and the receiving side material sensor 161 and the transmitting side material sensor 162. The combination of is built in the sensor fixing portion 130. The shape of the sensor fixing portion 130 when viewed from the upstream side in the transport direction may be an inverted U shape as shown in FIG. That is, the sensor fixing portion 130 is provided so as to sandwich the transport path 102 from above and below.

In the example shown in FIG. 4, the combination of the receiving side material sensor 161 and the transmitting side material sensor 162 is the combination of the upper sensor 191 and the lower sensor 192, and the receiving side outer diameter sensor 141 and the transmitting side. It is arranged on the upstream side in the transport direction with respect to the combination with the outer diameter sensor 142. However, the combination of the receiving side material sensor 161 and the transmitting side material sensor 162 is larger than the combination of the upper sensor 191 and the lower sensor 192 and the combination of the receiving side outer diameter sensor 141 and the transmitting side outer diameter sensor 142. , May be arranged on the downstream side in the transport direction.

The configuration of the coin discrimination device 100 according to the present embodiment has been described above. On the premise of the configuration of the coin discrimination device 100, the first example (first embodiment) will be described below as an example of the detection device included in the coin discrimination device 100. After that, a second example (second embodiment) will be described as another example of the detection device included in the coin discrimination device 100.

<< 3. First Embodiment >>
First, the first embodiment will be described.

(3.1. Outline of the first embodiment)
First, the outline of the first embodiment will be described. FIG. 7 is a diagram for explaining an outline of the first embodiment. As described above, the Tailgating sensor as an example of the transmissive magnetic sensor can be realized by the combination of the lower sensor 192 that generates the magnetic flux and the upper sensor 191 that detects the magnetic flux. On the other hand, the material thickness sensor as an example of the reflection type magnetic sensor can be realized by the lower sensor 192. However, as described above, the material thickness sensor is realized by the combination of the lower sensor 192 and the upper sensor 191 and is a sensor (both generating and detecting magnetic flux) between the lower sensor 192 and the upper sensor 191. Is desirable to be switched.

The sensor whose “sensor arrangement” shown in FIG. 7 is “upper” corresponds to the upper sensor 191. A sensor whose "sensor arrangement" is "lower" corresponds to the lower sensor 192. "Tailgating" corresponds to the width-aligning sensor, "material thickness (L)" corresponds to the material thickness sensor using the lower sensor, and "material thickness (U)" corresponds to the material thickness sensor using the upper sensor. Corresponds to. "Transmitting" means generating magnetic flux, and "receiving" means detecting magnetic flux. "Timing T1" is an example of the first state, and "timing T2" is an example of the second state.

Here, it is mainly assumed that "timing T1" arrives first and then "timing T2" arrives. However, the pre-post relationship between "timing T1" and "timing T2" is not limited to such an example. That is, "timing T2" may arrive first, followed by "timing T1". In the following, it is assumed that the "timing T2" is a state after the coin C has moved in the transport direction on the transport path 102 by a predetermined distance from the "timing T1". In other words, the "timing T2" may be in a state before the coin C moves in the transport direction on the transport path 102 by a predetermined distance from the "timing T1".

As shown in FIG. 7, in the “timing T1”, the magnetic flux corresponding to the width-aligning sensor (shown by the broken line in FIG. 7) and the magnetic flux corresponding to the material thickness sensor (in the solid line in FIG. 7) by the lower sensor 192. (Description) and is transmitted (generated). Further, in the "timing T1", the upper sensor 191 receives (detects) the magnetic flux corresponding to the width-aligning sensor penetrating the coin C. Further, in the "timing T1", the lower sensor 192 receives (detects) the magnetic flux corresponding to the material thickness sensor reflected from the coin C. In "timing T1", the transmission and reception of the magnetic flux corresponding to the material thickness sensor by the upper sensor 191 are stopped.

In the "timing T2", the upper sensor 191 transmits (generates) a magnetic flux (described by a solid line in FIG. 7) corresponding to the material thickness sensor. Then, in the "timing T2", the magnetic flux corresponding to the material thickness sensor reflected from the coin C is received (detected) by the upper sensor 191. In "timing T2", the transmission and reception of the magnetic flux corresponding to the material thickness sensor by the lower sensor 192 are stopped. Further, in the "timing T2", the transmission and reception of the magnetic flux corresponding to the width-alignment sensor by the upper sensor 191 and the lower sensor 192 are stopped.

The outline of the first embodiment of the present invention has been described above.

(3.2. Configuration of the first embodiment)
Subsequently, the configuration of the first embodiment will be described. FIG. 8 is a diagram showing a configuration example of the detection device according to the first embodiment. Referring to FIG. 8, the detection device 40A according to the first embodiment includes an analog adder circuit 410, an input unit 420A, an upper sensor 191 and a lower sensor 192, an output unit 430A, and an analog LPF (Low-). Pass Filter) 441, analog HPF (High-Pass Filter) 442, amplification / waveform shaping circuit 451, amplification / waveform shaping circuit 452, A / D (analog / digital) conversion unit 460, and control unit 400A. , A processing unit 470A is provided.

Since the upper sensor 191 and the lower sensor 192 are as described above, detailed description of the upper sensor 191 and the lower sensor 192 will be omitted.

(Analog adder circuit 410)
The analog adder circuit 410 generates a combined excitation signal by synthesizing the excitation signal of the material thickness sensor and the excitation signal of the width-alignment sensor. FIG. 9 is a diagram for explaining an example of processing of the analog adder circuit 410. Here, it is assumed that the frequency of the excitation signal of the lumber thickness sensor and the frequency of the excitation signal of the Tailgating sensor are different. As an example, FIG. 9 shows a case where the frequency of the excitation signal of the lumber thickness sensor is higher than the frequency of the excitation signal of the Tailgating sensor. However, the frequency of the excitation signal of the lumber thickness sensor may be lower than the frequency of the excitation signal of the Tailgating sensor.

(Input unit 420A)
The explanation will be continued by returning to FIG. The excitation signal of the lumber thickness sensor and the combined excitation signal generated by the analog adder circuit 410 are input to the input unit 420A.

For example, the input unit 420A inputs the excitation signal of the material thickness sensor to the upper sensor 191 (for example, by turning on the switch W21) according to the control by the control unit 400A, and excites the material thickness sensor to the upper sensor 191. Generates a magnetic flux based on the signal. Further, the input unit 420A does not input the excitation signal of the material thickness sensor to the upper sensor 191 according to the control by the control unit 400A (for example, by turning off the switch W21), but the excitation signal of the material thickness sensor by the upper sensor 191. Stops the generation of magnetic flux based on.

Further, the input unit 420A inputs the combined excitation signal to the lower sensor 192 (for example, by turning on the switch W22) according to the control by the control unit 400A, and the magnetic flux based on the combined excitation signal to the lower sensor 192. To generate. Further, the input unit 420A does not input the combined excitation signal to the lower sensor 192 (for example, by turning off the switch W22) according to the control by the control unit 400A, and the magnetic flux based on the combined excitation signal by the lower sensor 192. Stops the occurrence of.

(Output unit 430A)
The detection result by the upper sensor 191 and the detection result by the lower sensor 192 are input to the output unit 430A.

For example, the output unit 430A outputs the detection result by the upper sensor 191 to the analog LPF441 (for example, by connecting the switch W31 to the analog LPF441 side) according to the control by the control unit 400A. Further, the output unit 430A outputs the detection result by the lower sensor 192 to the analog HPF442 (for example, by connecting the switch W32 to the analog HPF442 side) according to the control by the control unit 400A.

Further, the output unit 430A outputs the detection result by the upper sensor 191 to the analog HPF442 (for example, by connecting the switch W31 to the analog HPF442 and the switch W32 to the upper sensor 191) according to the control by the control unit 400A. ..

(Analog LPF441 and Analog HPF442)
When the detection result by the upper sensor 191 is output from the output unit 430A, the analog LPF441 acquires the detection signal of the Tailgating sensor based on the detection result by the upper sensor 191. Further, when the detection result by the lower sensor 192 is output from the output unit 430A, the analog HPF442 acquires the detection signal of the material thickness sensor based on the detection result by the lower sensor 192. Further, when the detection result by the upper sensor 191 is output from the output unit 430A, the analog HPF442 acquires the detection signal of the material thickness sensor based on the detection result by the upper sensor 191.

FIG. 10 is a diagram for explaining an example of processing of analog LPF441 and analog HPF442. In the example shown in FIG. 10, the detection result (combination detection signal) of the magnetic flux based on the combined excitation signal of the excitation signal of the material thickness sensor and the excitation signal of the width adjustment sensor is output to the analog LPF441 and the analog HPF442. It is shown when it is output to. The analog LPF441 acquires the detection signal of the lower frequency Tailgating sensor, and the analog HPF442 acquires the detection signal of the higher frequency lumber sensor.

In this way, the analog adder circuit 410 generates a combined excitation signal of the excitation signal of the material thickness sensor and the excitation signal of the width adjustment sensor, and the analog LPF441 and the analog HPF442 generate the detection signal of the width adjustment sensor based on the detection result. Separation (frequency separation) from the detection signal of the material thickness sensor is performed. That is, synthesis and separation are performed for analog signals.

By combining and separating the analog signal in this way, it is possible to shorten the processing time as compared with the case where the digital signal is subjected to FFT (Fast Fourier Transform) to expand the frequency. Further, when FFT is applied to a digital signal, the multiplied frequency cannot be used, but the multiplied frequency can be used by combining and separating the analog signal. The analog LPF441 and the analog HPF442 function as an example of the acquisition unit.

(Amplification / waveform shaping circuit 451 and amplification / waveform shaping circuit 452)
The amplification / waveform shaping circuit 451 amplifies the signal of the detection signal of the width-aligning sensor acquired by the analog LPF441 and shapes the signal waveform. The analog signal processed by the amplification / waveform shaping circuit 451 is output to the A / D conversion unit 460. On the other hand, the amplification / waveform shaping circuit 452 amplifies the signal and shapes the signal waveform with respect to the detection signal of the material thickness sensor acquired by the analog HPF442. The analog signal processed by the amplification / waveform shaping circuit 452 is output to the A / D conversion unit 460.

(A / D conversion unit 460)
The A / D conversion unit 460 converts the analog signal processed by the amplification / waveform shaping circuit 451 into a digital signal, and obtains a detection signal of a digital width adjustment sensor. The A / D conversion unit 460 outputs the detection signal of the digital type width adjustment sensor to the processing unit 470A. Further, the A / D conversion unit 460 converts the analog signal processed by the amplification / waveform shaping circuit 452 into a digital signal to obtain a detection signal of a digital material thickness sensor. The A / D conversion unit 460 outputs the detection signal of the digital type material thickness sensor to the processing unit 470A.

(Control unit 400A)
The control unit 400A includes an arithmetic unit such as a CPU (Central Processing Unit), and a program (detection program) stored in a ROM (Read Only Memory) is expanded and executed by the arithmetic unit in a RAM (Random Access Memory). By doing so, the function can be realized. At this time, a computer-readable recording medium on which the program is recorded may also be provided. Alternatively, the control unit 400A may be configured by dedicated hardware or may be configured by a combination of a plurality of hardware. The data required for the calculation by the arithmetic unit is appropriately stored by a storage unit (not shown).

FIG. 11 is a flowchart showing an operation example of the control unit 400A according to the first embodiment. As shown in FIG. 11, while the power of the change machine 1 is not turned on (“NO” in S11), the operation returns to S11. On the other hand, when the power of the change machine 1 is turned on (“YES” in S11), a current is passed from a signal processing board (not shown) to the transmitting side material sensor 162, and a magnetic flux is generated by the transmitting side material sensor 162. To. An induced electromotive force is generated in the receiving side material sensor 161 by the magnetic flux generated by the transmitting side material sensor 162, and a current flows through the receiving side material sensor 161.

The current change of the receiving side material sensor 161 at this time is converted into a voltage change, and the voltage obtained by the conversion is subjected to processing such as amplification, noise reduction, and smoothing. The processed voltage thus obtained is detected as the output voltage of the material sensor (reception side material sensor 161 and transmission side material sensor 162) in the state where the coin is not conveyed in the transport path 102 (no medium state). To.

Further, the control unit 400A performs the control shown in "Timing T1" of FIG. 7. That is, the control unit 400A controls the input unit 420A so that the combined excitation signal of the excitation signal of the material thickness sensor and the excitation signal of the Tailgating sensor is input to the lower sensor 192 (S12). On the other hand, the control unit 400A controls the input unit 420A so that the excitation signal of the material thickness sensor is not input to the upper sensor 191. The lower sensor 192 generates a magnetic field based on the combined excitation signal. At this time, the output voltages of the upper sensor 191 and the lower sensor 192 in the non-medium state are also detected by the same method.

When a predetermined transaction is started in the change machine 1, the coins conveyed in the transfer path 102 are conveyed in the transfer direction by the transfer belt 104, and the magnetic flux of the material sensors (reception side material sensor 161 and transmission side material sensor 162). Is affected by the magnetic flux generated by the transmitting side material sensor 162, and an eddy current is generated on the surface of the coin. The eddy current generates a magnetic flux in the direction opposite to the direction of the magnetic flux generated by the transmitting side material sensor 162.

Therefore, the magnetic field in the section between the receiving side material sensor 161 and the transmitting side material sensor 162 changes from the non-medium state. The change in the magnetic field is captured by the receiving side material sensor 161 as a change in the output voltage between the non-medium state and the in-medium state. Since the change in the output voltage between the non-medium state and the in-medium state differs depending on the material of the coin, the material of the coin can be detected based on the change in the output voltage captured by the receiving side material sensor 161. The material of the coin can be used to identify the coin.

Subsequently, when the coin is further conveyed in the conveying direction by the conveying belt 104 and is applied to the magnetic flux of the outer diameter sensor (receiving side outer diameter sensor 141 and transmitting side outer diameter sensor 142), the receiving side outer diameter sensor 141 and the transmitting side outside are applied. The magnetic field in the section between the diameter sensor 142 and the diameter sensor 142 changes from the no-medium state. The change in the magnetic field is captured by the receiving side outer diameter sensor 141 as a change in the output voltage between the non-medium state and the medium state (similar to the way of capturing the change in the output voltage by the receiving side material sensor 161).

Since the degree of the coin applied to the magnetic flux differs depending on the outer diameter of the coin (that is, the denomination of the coin), the outer diameter of the coin can be detected based on the change in the output voltage captured by the receiving side outer diameter sensor 141. At this time, the change in the output voltage captured by the receiving side outer diameter sensor 141 may also depend on how far the coin is from the transport reference surface 113. Therefore, the correction value according to the change in the output voltage captured by the Tailgating sensor is multiplied by the outer diameter of the coin by the processing unit 470A, so that the detection accuracy of the outer diameter of the coin is further improved. The outer diameter of the coin can be used to identify the coin.

On the other hand, when a coin is applied to the magnetic flux based on the synthetic excitation signal generated by the lower sensor 192, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the non-medium state. The change in the magnetic field is captured by the upper sensor 191 and the lower sensor 192 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the synthetic excitation signal generated by the lower sensor 192 by the upper sensor 191 is input to the output unit 430A. Further, the detection result of the magnetic flux based on the combined excitation signal generated by the lower sensor 192 by the lower sensor 192 is input to the output unit 430A.

The control unit 400A controls the output unit 430A so as to output the detection result by the lower sensor 192 of the magnetic flux based on the synthetic excitation signal to the analog HPF442, and the detection result by the upper sensor 191 of the magnetic flux based on the synthetic excitation signal is analog. The output unit 430A is controlled so as to output to the LPF441 (S13). The analog HPF442 acquires the detection signal of the Tailgating sensor based on the detection result by the lower sensor 192 of the magnetic flux based on the synthetic excitation signal. On the other hand, the analog LPF441 acquires the detection signal of the lumber thickness sensor based on the detection result by the upper sensor 191 of the magnetic flux based on the synthetic excitation signal.

The detection signal of the width adjustment sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 451 and converted into a digital format by the A / D conversion unit 460, and then detected by the width adjustment sensor at the timing T1. It is acquired by the processing unit 470A as a signal (sensor output). On the other hand, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, converted into a digital format by the A / D conversion unit 460, and then the material thickness sensor at the timing T1. Is acquired by the processing unit 470A as a detection signal (sensor output) of.

Subsequently, the control unit 400A determines whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T1 (S14). While the control unit 400A determines that the conveyed amount of the coin C has not reached a predetermined distance based on the timing T1 (“NO” in S14), the operation returns to S14. On the other hand, when the control unit 400A determines that the conveyed amount of the coin C has reached a predetermined distance based on the timing T1 (“YES” in S14), the control shown in “Timing T2” of FIG. 7 I do.

That is, the control unit 400A controls the input unit 420A so that the excitation signal of the material thickness sensor is input to the upper sensor 191 (S15). On the other hand, the control unit 400A controls the input unit 420A so that the combined excitation signal is not input to the lower sensor 192. The upper sensor 191 generates a magnetic field based on the excitation signal of the lumber thickness sensor.

When a coin is applied to the magnetic flux based on the excitation signal of the material thickness sensor generated by the upper sensor 191, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the no-medium state. The change in the magnetic field is captured by the upper sensor 191 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the excitation signal of the material thickness sensor generated by the upper sensor 191 by the upper sensor 191 is input to the output unit 430A. Further, the detection result of the magnetic flux based on the excitation signal of the material thickness sensor generated by the upper sensor 191 by the lower sensor 192 is input to the output unit 430A.

The control unit 400A controls the output unit 430A so as to output the detection result of the magnetic flux detected by the upper sensor 191 based on the excitation signal of the material thickness sensor to the analog HPF442, and the lower sensor of the magnetic flux based on the excitation signal of the material thickness sensor. The output unit 430A is controlled so as to stop the output of the detection result by 192 (S16). The analog HPF442 acquires the detection signal of the lumber thickness sensor based on the detection result of the magnetic flux upper sensor 191 based on the excitation signal of the lumber thickness sensor. On the other hand, the analog LPF441 does not acquire the detection signal of the width adjustment sensor.

The detection signal of the width adjustment sensor at the timing T2 is not acquired by the processing unit 470A. On the other hand, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, converted into a digital format by the A / D conversion unit 460, and then the material thickness sensor at the timing T2. Is acquired by the processing unit 470A as a detection signal (sensor output) of.

The example shown in FIG. 11 is an example in which the operation of the control unit 400A ends after S16 is executed by the control unit 400A. However, after executing S16, the control unit 400A determines whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T2, and when the conveyed amount reaches a predetermined distance. S12 to S16 may be repeatedly executed once or a plurality of times. At this time, the sensor output of the material thickness sensor at the timing T1 and the timing T2 is obtained a plurality of times by the processing unit 470A. Similarly, the sensor output of the width-aligning sensor at the timing T1 is also obtained a plurality of times by the processing unit 470A.

In such a case, the sensor output of the lumber thickness sensor that takes the maximum value among the sensor outputs of the lumber thickness sensor obtained a plurality of times may be used by the processing unit 470A. At this time, the sensor output of the width-aligning sensor obtained at the timing corresponding to the timing at which the sensor output of the material thickness sensor having the maximum value is obtained may be used by the processing unit 470A.

(Processing unit 470A)
The processing unit 470A includes an arithmetic unit such as a CPU (Central Processing Unit), and a program (processing program) stored in a ROM (Read Only Memory) is expanded into a RAM (Random Access Memory) by the arithmetic unit and executed. By doing so, the function can be realized. At this time, a computer-readable recording medium on which the program is recorded may also be provided. Alternatively, the processing unit 470A may be configured by dedicated hardware, or may be configured by a combination of a plurality of hardware. The data required for the calculation by the arithmetic unit is appropriately stored by a storage unit (not shown).

As an example, the processing unit 470A can derive the material thickness of the coin C based on the sensor output of the material thickness sensor at the timing T1 and the sensor output of the width adjustment sensor at the timing T1. This improves the accuracy of detecting the thickness of the coin C.

Here, the sensor output of the width-alignment sensor 181 is attenuated as the deviation amount (lateral displacement amount) of the coin C with respect to the transport reference surface 113 increases. The attenuation of the sensor output of the width-alignment sensor 181 at this time is close to the amount of lateral displacement and linearity. On the other hand, the sensor output of the lumber thickness sensor also attenuates as the amount of lateral displacement increases. However, as described above, the sensor output of the lumber thickness sensor is greatly affected by the floating of coins.

Therefore, the processing unit 470A derives the lateral displacement amount (first position) of the coin at the timing T1 based on the sensor output of the width adjustment sensor at the timing T1. Then, the processing unit 470A corrects the sensor output of the lumber thickness sensor at the timing T1 based on the lateral displacement amount of the coin C at the timing T1. After that, the processing unit 470A derives the material thickness of the coin C based on the sensor output of the material thickness sensor at the corrected timing T1. The correction amount can be calculated by multiplying the lateral displacement amount by a predetermined ratio of the damping amount (damping factor). At the timing T1, since the magnetic flux based on the excitation signal of the material thickness sensor is detected by the lower sensor 192, the attenuation amount of the sensor output of the material thickness sensor from the lower sensor 192 is used.

For example, when the sensor output of the Tailgating sensor at the timing T1 is A, the ratio of the attenuation amount (attenuation rate) of the sensor output of the Tailgating sensor to the lateral displacement amount is α, and the coin is conveyed along the transfer reference surface 113. Let A0 be the sensor output of the width-alignment sensor in. Further, the sensor output of the material thickness sensor from the lower sensor 192 at the timing T1 is set to B, the ratio (damping rate) of the sensor output of the material thickness sensor from the lower sensor 192 to the lateral displacement amount is set to β, and the transfer is performed. The sensor output of the material thickness sensor from the lower sensor 192 when the coin is conveyed along the reference surface 113 is set to B0. Further, the distance (lateral displacement amount) of the coin from the transport reference surface 113 is defined as X.

At this time, when the lateral displacement amount X is calculated based on the sensor output A of the Tailgating sensor at the timing T1, X is calculated as shown in the following equation (1).

X = (A-A0) / α ... (1)

Further, the sensor output B0 of the material thickness sensor from the lower sensor 192 when the coin is conveyed along the transfer reference surface 113 is as follows in consideration of the above equation (1) and the following equation (2). It is calculated as shown in the equation (3) of.

B = X * β + B0 ... (2)
B0 = B-X * β = B- (A-A0) * β / α ... (3)

Further, the processing unit 470A adds to the sensor output of the material thickness sensor at the timing T1 and the sensor output of the width-aligning sensor at the timing T1, and further adds the sensor output of the material thickness sensor at the timing T2 to the coin C. The material thickness of can be derived. As a result, the accuracy of detecting the thickness of the coin C is further improved.

Here, in the timing T2, since the magnetic flux based on the excitation signal of the material thickness sensor is detected by the upper sensor 191, the attenuation amount of the sensor output of the material thickness sensor from the upper sensor 191 is used. However, the ratio (damping rate) (γ) of the sensor output of the material thickness sensor from the upper sensor 191 to the lateral displacement amount X is the attenuation of the sensor output of the material thickness sensor from the lower sensor 192 to the lateral displacement amount. It is assumed that it differs from the amount ratio (attenuation rate) β.

Therefore, the processing unit 470A derives the lateral displacement amount (first position) of the coin at the timing T1 based on the sensor output of the width adjustment sensor at the timing T1. Then, the processing unit 470A is based on the lateral displacement amount X of the coin C at the timing T1 and the ratio (first attenuation rate) β of the sensor output of the material thickness sensor from the lower sensor 192 to the lateral displacement amount. The sensor output B of the material thickness sensor at the timing T1 is corrected.

On the other hand, in the processing unit 470A, the ratio of the lateral displacement amount (first position) of the coin C at the timing T1 to the damping amount of the sensor output of the material thickness sensor from the upper sensor 191 to the lateral displacement amount X (second damping rate). The sensor output C of the material thickness sensor at the timing T2 is corrected based on γ.

After that, the processing unit 470A derives the material thickness of the coin C based on the sensor output of the material thickness sensor at the corrected timing T1 and the sensor output of the material thickness sensor at the corrected timing T2.

For example, let C be the sensor output of the material thickness sensor from the upper sensor 191 at the timing T2, and let C0 be the sensor output of the material thickness sensor from the upper sensor 191 when the coin is conveyed along the transfer reference surface 113. At this time, the sensor output C0 of the material thickness sensor from the upper sensor 191 when the coin is transported along the transport reference surface 113 is as follows, considering the above equation (1) and the following equation (4). It is calculated as shown in the equation (5) of.

C = X * γ + C0 ... (4)
C0 = C-X * γ = C- (A-A0) * γ / α ... (5)

FIG. 12 is a diagram showing an example of the relationship between the lateral displacement amount and the sensor output. Referring to FIG. 12, a graph of the sensor output of the material thickness sensor from the upper sensor 191 with respect to the lateral displacement amount X is shown as the “upper sensor”. Further, a graph of the sensor output of the material thickness sensor from the lower sensor 192 with respect to the lateral displacement amount X is shown as a “lower sensor”. As shown in FIG. 12, for example, when the distance between the upper sensor 191 and the coin C is smaller than the distance between the lower sensor 192 and the coin C, the sensor output of the material thickness sensor from the "upper sensor" is , It is conceivable that the material decays more than the sensor output of the material thickness sensor from the "lower sensor".

FIG. 13 is a diagram showing a correction example of the sensor output according to the first embodiment. Referring to FIG. 13, the rate of change (= absolute value of attenuation rate) “2” of the sensor output of the material thickness sensor from the upper sensor 191 with respect to the lateral displacement amount X is the lateral displacement amount, as in the case shown in FIG. The rate of change of the sensor output of the material thickness sensor from the lower sensor 192 with respect to X is larger than the rate of change "1". However, the lateral displacement amount X is obtained only at the timing T1. Therefore, the same value "1" is used as the lateral displacement amount corresponding to the upper sensor 191 and the lateral displacement amount corresponding to the lower sensor 192.

At this time, as an example, the correction amount of the sensor output of the material thickness sensor from the upper sensor 191 is the product of the rate of change "2" corresponding to the sensor output of the material thickness sensor from the upper sensor 191 and the lateral displacement amount "1". Is calculated as "2". Further, the sensor output of the material thickness sensor from the upper sensor 191 after correction is "7" by adding the correction amount "2" to the sensor output "5" of the material thickness sensor from the upper sensor 191 before correction. Can be calculated as.

Similarly, as an example, the correction amount of the sensor output of the material thickness sensor from the lower sensor 192 is the rate of change "1" and the amount of lateral displacement "1" corresponding to the sensor output of the material thickness sensor from the lower sensor 192. Is calculated as "1" by the multiplication of. Further, the sensor output of the material thickness sensor from the lower sensor 192 after correction is obtained by adding the correction amount "1" to the sensor output "5" of the material thickness sensor from the lower sensor 192 before correction. It can be calculated as "6". These corrected sensor outputs (coin thickness) can be used for coin discrimination.

FIG. 14 is a diagram showing an example of the relationship between the sensor output of the material thickness sensor from the upper sensor 191 and the sensor output of the material thickness sensor from the lower sensor 192 according to the first embodiment. Referring to FIG. 14, the “normal range” of the sensor output is shown. Further, the sensor output of the lumber thickness sensor changes with the "change in the amount of lateral displacement". In addition, the sensor output of the lumber thickness sensor changes with the "change in coin float". The direction of change in the sensor output of the material thickness sensor due to the "change in the amount of lateral displacement" and the direction of change in the sensor output of the material thickness sensor due to the "change in coin float" are orthogonal to each other.

E0 indicates the sensor output (“upper sensor” = 5, “lower sensor” = 5) of the material thickness sensor before correction. The E11 applies the sensor output of the material thickness sensor after correction (“upper sensor” = 7, “lower sensor” = 5) according to the correction amount “2” of the sensor output of the material thickness sensor from the upper sensor 191. show. The E21 is the sensor output of the material thickness sensor after being corrected according to the correction amount “1” of the sensor output of the material thickness sensor from the lower sensor 192 (“upper sensor” = 7, “lower sensor” = 6). Is shown. In the example shown in FIG. 14, it is understood that the sensor output E21 of the corrected material thickness sensor is corrected so as to be within the “normal range”.

(3.3. Summary of the first embodiment)
As described above, according to the first embodiment, the transmission type magnetic sensor and the reflection type magnetic sensor can be realized by the upper sensor 191 and the lower sensor 192. Therefore, it is possible to reduce the manufacturing cost of the magnetic sensor and reduce the space for mounting the magnetic sensor.

Further, according to the first embodiment, the detection signal (sensor output) detected by the reflection type magnetic sensor can be corrected based on the lateral displacement amount detected by the width-alignment sensor. As a result, the transport belt 104 is placed above the position where the vicinity of the center of the coin C passes, and the material thickness sensor is placed closer to the transport reference surface 113 than the position where the vicinity of the center of the coin C passes. Since it is possible to prevent the area of the coin C applied to the magnetic flux generated from the coin C from changing, it is possible to suppress a decrease in the detection accuracy of the characteristics (material thickness) of the coin C. Moreover, since the transport belt 104 can be arranged above the position where the vicinity of the center of the coin C passes, it is possible to improve the transport performance of the coin C.

<< 4. Second embodiment >>
First, the second embodiment will be described.

(4.1. Outline of the second embodiment)
First, the outline of the second embodiment will be described. FIG. 15 is a diagram for explaining the outline of the second embodiment. As shown in FIG. 15, the “timing T1” in the second embodiment is the same as the “timing T1” (FIG. 7) in the first embodiment.

On the other hand, in the "timing T2", not only the magnetic flux corresponding to the material thickness sensor is transmitted (generated) by the upper sensor 191 but also the magnetic flux corresponding to the width-alignment sensor is transmitted by the lower sensor 192. (Generated). Then, in the "timing T2", not only the magnetic flux corresponding to the material thickness sensor reflected from the coin C is received (detected) by the upper sensor 191 but also penetrates the coin C by the lower sensor 192. The magnetic flux corresponding to the Tailgating sensor is received (detected).

The outline of the second embodiment of the present invention has been described above.

(4.2. Configuration of the second embodiment)
Subsequently, the configuration of the second embodiment will be described. FIG. 16 is a diagram showing a configuration example of the detection device according to the second embodiment. Referring to FIG. 16, the detection device 40B according to the second embodiment has an analog adder circuit 410, an upper sensor 191 and a lower sensor 192, an analog LPF441, and an analog HPF442, as in the first embodiment. The amplification / waveform shaping circuit 451, the amplification / waveform shaping circuit 452, and the A / D conversion unit 460 are provided.

The detection device 40B according to the second embodiment is provided with an input unit 420A, an output unit 430A, a control unit 400A, and a processing unit 470A, which are provided in the detection device 40A of the first embodiment. It includes a unit 420B, an output unit 430B, a control unit 400B, and a processing unit 470B. Hereinafter, the input unit 420B, the output unit 430B, the control unit 400B, and the processing unit 470B will be mainly described.

(Input unit 420B)
The combined excitation signal generated by the analog adder circuit 410 is input to the input unit 420B.

For example, the input unit 420B inputs the combined excitation signal to the upper sensor 191 (for example, by connecting the switch W23 to the upper sensor 191 side) according to the control by the control unit 400B, and makes the combined excitation signal to the upper sensor 191. Generates a magnetic flux based on it. Further, the input unit 420B inputs a synthetic excitation signal to the lower sensor 192 according to the control by the control unit 400B (for example, by connecting the switch W23 to the lower sensor 192 side), and the input unit 420B inputs the combined excitation signal to the lower sensor 192, and the combined excitation by the lower sensor 192. Generates a magnetic flux based on the signal.

(Output unit 430B)
The detection result by the upper sensor 191 and the detection result by the lower sensor 192 are input to the output unit 430B.

For example, the output unit 430B outputs the detection result by the upper sensor 191 to the analog LPF441 (for example, by connecting the switch W33 to the upper sensor 191 side) according to the control by the control unit 400B. Further, the output unit 430B outputs the detection result by the lower sensor 192 to the analog LPF 441 (for example, by connecting the switch W33 to the lower sensor 192 side) according to the control by the control unit 400B.

Further, the output unit 430B outputs the detection result by the upper sensor 191 to the analog HPF442 (for example, by connecting the switch W34 to the upper sensor 191 side) according to the control by the control unit 400B. Further, the output unit 430B outputs the detection result by the lower sensor 192 to the analog HPF 442 (for example, by connecting the switch W34 to the lower sensor 192 side) according to the control by the control unit 400B.

(Control unit 400B)
FIG. 17 is a flowchart showing an operation example of the control unit 400B according to the second embodiment. As shown in FIG. 17, S11 to S14 are executed in the same manner as S11 to S14 (FIG. 11) in the first embodiment.

When the control unit 400B determines that the conveyed amount of the coin C has reached a predetermined distance based on the timing T1 (“YES” in S14), the control unit 400B performs the control shown in “Timing T2” of FIG. .. That is, the control unit 400B controls the input unit 420B so that the combined excitation signal is input to the upper sensor 191 (S25). The upper sensor 191 generates a magnetic field based on the combined excitation signal.

When a coin is applied to the magnetic flux based on the excitation signal of the material thickness sensor generated by the upper sensor 191, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the no-medium state. The change in the magnetic field is captured by the upper sensor 191 and the lower sensor 192 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the synthetic excitation signal generated by the upper sensor 191 by the upper sensor 191 is input to the output unit 430B. Further, the detection result of the magnetic flux based on the combined excitation signal generated by the upper sensor 191 by the lower sensor 192 is input to the output unit 430B.

The control unit 400B controls the output unit 430A so as to output the detection result by the upper sensor 191 of the magnetic flux based on the synthetic excitation signal to the analog HPF442, and the detection result by the lower sensor 192 of the magnetic flux based on the synthetic excitation signal is analog. The output unit 430B is controlled so as to output to the LPF441 (S26). The analog LPF441 acquires the detection signal of the Tailgating sensor based on the detection result by the lower sensor 192 of the magnetic flux based on the synthetic excitation signal. On the other hand, the analog HPF442 acquires the detection signal of the lumber thickness sensor based on the detection result by the upper sensor 191 of the magnetic flux based on the synthetic excitation signal.

In the second embodiment, the detection signal of the width adjustment sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 451 and converted into a digital format by the A / D conversion unit 460. It is acquired by the processing unit 470B as a detection signal (sensor output) of the width adjustment sensor at the timing T2. On the other hand, as in the first embodiment, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, and is converted into a digital format by the A / D conversion unit 460. After that, it is acquired by the processing unit 470B as a detection signal (sensor output) of the material thickness sensor at the timing T2.

The example shown in FIG. 17 is an example in which the operation of the control unit 400B ends after S26 is executed by the control unit 400B. However, also in the second embodiment, as in the first embodiment, after the control unit 400B executes S26, whether or not the amount of coin C transported reaches a predetermined distance with respect to the timing T2. The process of determining the above and S12 to S14, S25, and S26 when the transport amount reaches a predetermined distance may be repeatedly executed one or a plurality of times.

(Processing unit 470B)
In the second embodiment, the sensor output of the Tailgating sensor at the timing T2 is also obtained. Therefore, the processing unit 470B includes the sensor output of the material thickness sensor at the timing T1, the sensor output of the width adjustment sensor at the timing T1, the sensor output of the material thickness sensor at the timing T2, and the sensor output of the width adjustment sensor at the timing T2. The material thickness of the coin C can be derived based on the above. As a result, the sensor output of the Tailgating sensor at the timing T2 is also taken into consideration in detecting the thickness of the coin C, so that even if the lateral displacement amount of the coin C changes from the timing T1 to the timing T2. , The material thickness of coin C can be detected with higher accuracy.

More specifically, the processing unit 470B derives the lateral displacement amount X1 (first position) of the coin at the timing T1 based on the sensor output of the width adjustment sensor at the timing T1. Then, the processing unit 470B is based on the lateral displacement amount X1 of the coin C at the timing T1 and the ratio (first attenuation rate) β of the sensor output of the material thickness sensor from the lower sensor 192 to the lateral displacement amount. The sensor output B of the material thickness sensor at the timing T1 is corrected.

On the other hand, the processing unit 470B is the ratio of the lateral displacement amount X2 (second position) of the coin C at the timing T2 to the damping amount of the sensor output of the material thickness sensor from the upper sensor 191 to the lateral displacement amount X2 (second damping rate). ) The sensor output C of the material thickness sensor at the timing T2 is corrected based on γ.

After that, the processing unit 470B derives the material thickness of the coin C based on the sensor output of the material thickness sensor at the corrected timing T1 and the sensor output of the material thickness sensor at the corrected timing T2.

FIG. 18 is a diagram showing a correction example of the sensor output according to the second embodiment. Referring to FIG. 18, unlike the first embodiment (FIG. 13), the lateral displacement amount “1” at the timing T1 and the lateral displacement amount “3” at the timing T2 are obtained as the lateral displacement amount. Therefore, in the second embodiment, the correction amount of the sensor output of the material thickness sensor from the lower sensor 192 is the rate of change "1" corresponding to the sensor output of the material thickness sensor from the lower sensor 192 and the lateral displacement amount. It is calculated as "3" by multiplying it with "3". Further, the sensor output of the material thickness sensor from the lower sensor 192 after correction is obtained by adding the correction amount "3" to the sensor output "5" of the material thickness sensor from the lower sensor 192 before correction. It can be calculated as "8".

On the other hand, the sensor output of the material thickness sensor from the upper sensor 191 after the correction is the correction amount "2" to the sensor output "5" of the material thickness sensor from the upper sensor 191 before the correction, as in the first embodiment. Can be calculated as "7" by adding. These corrected sensor outputs (coin thickness) can be used for coin discrimination.

FIG. 19 is a diagram showing an example of the relationship between the sensor output of the material thickness sensor from the upper sensor 191 and the sensor output of the material thickness sensor from the lower sensor 192. With reference to FIG. 19, the "normal range" of the sensor output is shown, as in the first embodiment (FIG. 14). E0 and E11 are in the same positions as E0 and E11 in the first embodiment (FIG. 14). The E22 is the sensor output of the material thickness sensor after being corrected according to the correction amount “3” of the sensor output of the material thickness sensor from the lower sensor 192 (“upper sensor” = 7, “lower sensor” = 8). Is shown. It can be seen that the sensor output E22 of the corrected material thickness sensor is corrected so as to be located at the center of the "normal range" as compared with E21 in the first embodiment (FIG. 14).

(4.3. Summary of the second embodiment)
As described above, according to the second embodiment, the same effect as that of the first embodiment is obtained. Further, according to the second embodiment, the sensor output of the Tailgating sensor at the timing T2 is also taken into consideration in detecting the material thickness of the coin C. Therefore, even when the lateral displacement amount of the coin C changes from the timing T1 to the timing T2, the material thickness of the coin C can be detected with higher accuracy.

<5. Modification example>
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

For example, in the first embodiment, the sensor is made to input a combined excitation signal of the excitation signal of the material thickness sensor having different frequencies and the excitation signal of the width adjustment sensor, and the material thickness sensor is detected based on the detection result by the sensor. An example of separating the signal and the detection signal of the width adjustment sensor has been described. However, an excitation signal common to the excitation signal of the material thickness sensor and the excitation signal of the width adjustment sensor is input to the sensor, and the detection result by the sensor is not separated and is directly detected by the material thickness sensor or the width adjustment sensor. A modification example that is output as a signal can also be assumed.

Therefore, in the following, a modification of the first embodiment will be described with reference to FIGS. 20 and 21. Further, in the second embodiment, a similar modification can be assumed. Therefore, following the modified example of the first embodiment, the modified example of the second embodiment will be described with reference to FIGS. 22 and 23.

(5.1. Configuration of a modified example of the first embodiment)
Subsequently, the configuration of the modified example of the first embodiment will be described. FIG. 20 is a diagram showing a configuration example of a detection device according to a modified example of the first embodiment. Referring to FIG. 20, the detection device 40C according to the first embodiment includes an input unit 420B, an upper sensor 191, a lower sensor 192, an output unit 430B, an amplification / waveform shaping circuit 451 and an amplification / waveform. It includes a shaping circuit 452, an A / D conversion unit 460, a control unit 400C, and a processing unit 470A. Hereinafter, the control unit 400C will be mainly described.

(Control unit 400C)
FIG. 21 is a flowchart showing an operation example of the control unit 400C according to the modified example of the first embodiment. As shown in FIG. 21, while the power of the change machine 1 is not turned on (“NO” in S11), the operation returns to S11. On the other hand, when the power of the change machine 1 is turned on (“YES” in S11), the material sensor (reception side material sensor 161 and transmission side material sensor 162) in the non-medium state is the same as in the first embodiment. ) Output voltage is detected.

Further, the control unit 400C performs the control shown in "Timing T1" of FIG. 7. That is, the control unit 400C controls the input unit 420B so that the excitation signal common to the material thickness sensor and the width adjustment sensor (hereinafter, also simply referred to as “common excitation signal”) is input to the lower sensor 192. (S32). On the other hand, the control unit 400C controls the input unit 420B so that the common excitation signal is not input to the upper sensor 191. The lower sensor 192 generates a magnetic field based on a common excitation signal. At this time, the output voltages of the upper sensor 191 and the lower sensor 192 in the non-medium state are also detected by the same method.

When a predetermined transaction is started in the change machine 1, the material of the coin can be detected as in the first embodiment. Subsequently, when the coin is further conveyed in the transfer direction by the transfer belt 104 and is applied to the magnetic flux of the outer diameter sensor (reception side outer diameter sensor 141 and transmission side outer diameter sensor 142), the coin is received as in the first embodiment. The side outer diameter sensor 141 captures the change in output voltage between the non-medium state and the in-medium state.

On the other hand, when a coin is applied to the magnetic flux based on the common excitation signal generated by the lower sensor 192, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the non-medium state. The change in the magnetic field is captured by the upper sensor 191 and the lower sensor 192 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the common excitation signal generated by the lower sensor 192 by the upper sensor 191 is input to the output unit 430B. Further, the detection result of the magnetic flux based on the common excitation signal generated by the lower sensor 192 by the lower sensor 192 is input to the output unit 430B.

The control unit 400C controls the output unit 430B so as to output the detection result by the lower sensor 192 of the magnetic flux based on the common excitation signal to the amplification / waveform shaping circuit 452 as the detection signal of the material thickness sensor, and also controls the common excitation. The output unit 430B is controlled so that the detection result of the magnetic flux based on the signal by the upper sensor 191 is output to the amplification / waveform shaping circuit 451 as the detection signal of the width adjustment sensor (S33).

The detection signal of the width adjustment sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 451 and converted into a digital format by the A / D conversion unit 460, and then detected by the width adjustment sensor at the timing T1. It is acquired by the processing unit 470A as a signal (sensor output). On the other hand, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, converted into a digital format by the A / D conversion unit 460, and then the material thickness sensor at the timing T1. Is acquired by the processing unit 470A as a detection signal (sensor output) of.

Subsequently, the control unit 400C determines whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T1 (S14). While the control unit 400C determines that the conveyed amount of the coin C has not reached a predetermined distance based on the timing T1 (“NO” in S14), the operation returns to S14. On the other hand, when the control unit 400C determines that the conveyed amount of the coin C has reached a predetermined distance based on the timing T1 (“YES” in S14), the control shown in “Timing T2” of FIG. 7 I do.

That is, the control unit 400C controls the input unit 420B so that the common excitation signal is input to the upper sensor 191 (S35). On the other hand, the control unit 400C controls the input unit 420B so that the common excitation signal is not input to the lower sensor 192. The upper sensor 191 generates a magnetic field based on a common excitation signal.

When a coin is applied to the magnetic flux based on the common excitation signal generated by the upper sensor 191, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the no-medium state. The change in the magnetic field is captured by the upper sensor 191 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the common excitation signal generated by the upper sensor 191 by the upper sensor 191 is input to the output unit 430B. Further, the detection result of the magnetic flux based on the common excitation signal generated by the upper sensor 191 by the lower sensor 192 is input to the output unit 430B.

The control unit 400C controls the output unit 430B so as to output the detection result of the magnetic flux based on the common excitation signal 191 to the amplification / waveform shaping circuit 452, and the lower sensor of the magnetic flux based on the common excitation signal. The output unit 430B is controlled so as to stop the output of the detection result by 192 (S36).

The detection signal of the width adjustment sensor at the timing T2 is not acquired by the processing unit 470A. On the other hand, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, converted into a digital format by the A / D conversion unit 460, and then the material thickness sensor at the timing T2. Is acquired by the processing unit 470A as a detection signal (sensor output) of.

The example shown in FIG. 21 is an example in which the operation of the control unit 400C ends after S36 is executed by the control unit 400C. However, as in the first embodiment, after executing S36, the control unit 400C performs a process of determining whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T2, and the conveyed amount. S32 to S36 when a predetermined distance is reached may be repeatedly executed one or a plurality of times.

(5.2. Configuration of the modified example of the second embodiment)
Subsequently, the configuration of the modified example of the second embodiment will be described. FIG. 22 is a diagram showing a configuration example of the detection device according to the modified example of the second embodiment. Referring to FIG. 22, the detection device 40D according to the second embodiment includes an input unit 420B, an upper sensor 191, a lower sensor 192, an output unit 430B, an amplification / waveform shaping circuit 451 and an amplification / waveform. It includes a shaping circuit 452, an A / D conversion unit 460, a control unit 400D, and a processing unit 470B. Hereinafter, the control unit 400D will be mainly described.

(Control unit 400D)
FIG. 23 is a flowchart showing an operation example of the control unit according to the modified example of the second embodiment. As shown in FIG. 23, S11, S32, and S33 are executed in the same manner as S111, S32, and S33 (FIG. 21) in the modified example of the first embodiment.

Subsequently, the control unit 400D determines whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T1 (S14). While the control unit 400D determines that the conveyed amount of the coin C has not reached a predetermined distance based on the timing T1 (“NO” in S14), the operation returns to S14. On the other hand, when the control unit 400D determines that the conveyed amount of the coin C has reached a predetermined distance based on the timing T1 (“YES” in S14), the control shown in “Timing T2” of FIG. I do.

That is, the control unit 400D controls the input unit 420B so that the common excitation signal is input to the upper sensor 191 (S35). On the other hand, the control unit 400D controls the input unit 420B so that the common excitation signal is not input to the lower sensor 192. The upper sensor 191 generates a magnetic field based on a common excitation signal.

When a coin is applied to the magnetic flux based on the common excitation signal generated by the upper sensor 191, the magnetic field in the section between the upper sensor 191 and the lower sensor 192 changes from the no-medium state. The change in the magnetic field is captured by the upper sensor 191 as a change in the output voltage between the non-medium state and the in-medium state. The detection result of the magnetic flux based on the common excitation signal generated by the upper sensor 191 by the upper sensor 191 is input to the output unit 430B. Further, the detection result of the magnetic flux based on the common excitation signal generated by the upper sensor 191 by the lower sensor 192 is input to the output unit 430B.

The control unit 400D controls the output unit 430B so as to output the detection result of the magnetic flux based on the common excitation signal 191 to the amplification / waveform shaping circuit 452, and the lower sensor of the magnetic flux based on the common excitation signal. The output unit 430B is controlled so as to output the detection result by 192 to the amplification / waveform shaping circuit 451 (S46).

The detection signal of the width adjustment sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 451 and converted into a digital format by the A / D conversion unit 460, and then detected by the width adjustment sensor at the timing T2. It is acquired by the processing unit 470B as a signal (sensor output). On the other hand, it is acquired by the processing unit 470B as a detection signal of the width adjustment sensor at the timing T2. On the other hand, the detection signal of the material thickness sensor is signal-amplified and the signal waveform is shaped by the amplification / waveform shaping circuit 452, converted into a digital format by the A / D conversion unit 460, and then the material thickness sensor at the timing T2. Is acquired by the processing unit 470B as a detection signal (sensor output) of.

The example shown in FIG. 23 is an example in which the operation of the control unit 400D ends after S46 is executed by the control unit 400D. However, as in the second embodiment, after executing S46, the control unit 400D performs a process of determining whether or not the conveyed amount of the coin C has reached a predetermined distance with reference to the timing T2, and the conveyed amount. S32, S33, S14, S35, S46 may be repeatedly executed one or a plurality of times when a predetermined distance is reached.

40A, 40B detection device 100 coin discrimination device 191 upper sensor 192 lower sensor 400A, 400B control unit 420A, 420B input unit 430A, 430B output unit 441 analog LPF
442 Analog HPF
470A, 470B Processing unit

Claims (20)

The first coil, which is placed at a position where magnetic flux that passes through the detection range where the detection target is detected can be generated,
The second coil, which is arranged at a position where the magnetic flux generated by the first coil and passed through the detection range can be detected,
At least the input unit connected to the first coil and
The output unit connected to the first coil and the second coil,
Equipped with
In the first state, the input unit excites the first coil to generate a magnetic flux.
In the first state, the output unit causes the second coil to detect the magnetic flux and causes the first coil to detect the magnetic flux.
Detection device. The input unit excites the second coil to generate a magnetic field in a second state different from the first state.
The output unit causes the second coil to detect a magnetic flux in the second state.
The detection device according to claim 1. In the second state, the output unit causes the second coil to detect the magnetic flux and causes the first coil to detect the magnetic flux.
The detection device according to claim 2. In the first state, the input unit generates a magnetic flux in the first coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor.
The detection device is
Based on the detection result by the second coil in the first state, the detection signal of the transmission type sensor in the first state is acquired, and the detection result by the first coil in the first state is obtained. The acquisition unit for acquiring the detection signal of the reflection type sensor in the first state is provided based on the above.
The detection device according to claim 1. In the first state, the input unit generates a magnetic flux in the first coil based on an excitation signal common to the transmission type sensor and the reflection type sensor.
The output unit outputs the detection result by the second coil in the first state as a detection signal of the transmissive sensor in the first state, and detects by the first coil in the first state. The result is output as the reflection type detection signal in the first state.
The detection device according to claim 1. In the first state, the input unit generates a magnetic flux in the first coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor.
The detection device is
Based on the detection result by the second coil in the first state, the detection signal of the transmission type sensor in the first state is acquired, and the detection result by the first coil in the first state is obtained. Based on the above, the acquisition unit for acquiring the detection signal of the reflection type sensor in the first state is provided.
In the second state, the input unit generates a magnetic flux in the second coil based on the excitation signal of the reflection type sensor.
The acquisition unit acquires the detection signal of the reflection type sensor in the second state based on the detection result by the second coil in the second state.
The detection device according to claim 2. In the first state, the input unit generates a magnetic flux in the first coil based on an excitation signal common to the transmission type sensor and the reflection type sensor.
The output unit outputs the detection result by the second coil in the first state as a detection signal of the transmissive sensor in the first state, and detects by the first coil in the first state. The result is output as a detection signal of the reflection type sensor in the first state, and the result is output.
In the second state, the input unit generates a magnetic flux in the second coil based on the common excitation signal.
The output unit outputs the detection result of the second coil in the second state as a detection signal of the reflection type sensor in the second state.
The detection device according to claim 2. In the second state, the input unit generates a magnetic flux in the second coil based on the combined excitation signal obtained by combining the excitation signal of the transmission type sensor and the excitation signal of the reflection type sensor.
The acquisition unit acquires the detection signal of the reflection type sensor in the second state based on the detection result by the second coil in the second state, and the first in the second state. The detection signal of the transmissive sensor in the second state is acquired based on the detection result by the coil of the above.
The detection device according to claim 6. In the second state, the input unit generates a magnetic flux in the second coil based on the common excitation signal.
The output unit outputs the detection result by the second coil in the second state as a detection signal of the reflection type sensor in the second state, and also by the first coil in the second state. The detection result is output as a detection signal of the transmissive sensor in the second state.
The detection device according to claim 7. The detection device is
A processing unit for deriving the characteristics of the detection target based on the detection signal of the transmission type sensor in the first state and the detection signal of the reflection type sensor in the first state is provided.
The detection device according to claim 4 or 5. The processing unit
The first position of the detection target is derived based on the detection signal of the transmission type sensor in the first state, and the detection signal of the reflection type sensor in the first state is derived based on the first position. It is corrected, and the feature of the detection target is derived based on the detection signal of the reflection type sensor in the first state after the correction.
The detection device according to claim 10. The detection device is
The detection is based on the detection signal of the transmissive sensor in the first state, the detection signal of the reflective sensor in the first state, and the detection signal of the reflective sensor in the second state. It has a processing unit that derives the characteristics of the target.
The detection device according to claim 6 or 7. The processing unit
The first position of the detection target is derived based on the detection signal of the transmission type sensor in the first state, and the said in the first state based on the first position and the first attenuation factor. Corrects the detection signal of the reflective sensor and corrects it.
The detection signal of the reflective sensor in the second state is corrected based on the first position and the second attenuation factor different from the first attenuation factor.
The feature of the detection target is derived based on the detection signal of the reflection type sensor in the first state after correction and the detection signal of the reflection type sensor in the second state after correction.
The detection device according to claim 12. The detection device is
The detection signal of the transmissive sensor in the first state, the detection signal of the reflective sensor in the first state, the detection signal of the transmissive sensor in the second state, and the second state. A processing unit for deriving the characteristics of the detection target based on the detection signal of the reflection type sensor in the above.
The detection device according to claim 8 or 9. The processing unit
The first position of the detection target is derived based on the detection signal of the transmission type sensor in the first state, and the said in the first state based on the first position and the first attenuation factor. Corrects the detection signal of the reflective sensor and corrects it.
The second position of the detection target is derived based on the detection signal of the transmission type sensor in the second state, and the second position and the second attenuation factor different from the first attenuation factor are obtained. Based on, the detection signal of the reflection type sensor in the second state is corrected, and
The feature of the detection target is derived based on the detection signal of the reflection type sensor in the first state after correction and the detection signal of the reflection type sensor in the second state after correction.
The detection device according to claim 14. The second state is a state before the detection target moves by a predetermined distance from the first state, or a state after the detection target has moved by a predetermined distance.
The detection device according to claim 2. The detection target is a plate-shaped object,
The detection device according to any one of claims 1 to 16. The characteristic of the detection target is the thickness of the detection target.
The detection device according to any one of claims 10 to 15. The detection target is a coin,
A coin discrimination device including the detection device according to any one of claims 1 to 18. Computer,
An input unit that is at least connected to the first coil that is arranged at a position where magnetic flux that reaches the detection range where the detection target is detected can be generated.
The second coil, which is arranged at a position where the magnetic flux generated by the first coil and passed through the detection range can be detected, and the output unit connected to the first coil,
It is a detection program that functions as a control unit that controls
The control unit
In the first state, the input unit is controlled so as to excite the first coil to generate a magnetic flux, the second coil detects the magnetic flux, and the first coil detects the magnetic flux. To control the output unit,
Detection program.

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