JPH10261128A - Magnetic sensor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable magnetic sensor device which can highly precisely detect the physical quantity of coins without the need of grinding after the shaping of the mold of a core, without the need of enlarging the balance adjusting range of a bridge circuit and without the dispersion of devices. SOLUTION: The end part of a first bobbin 43 into which a first coil 44 is inserted is adjusted to the opening 41a of the cylindrical part 41 of a first core 40. The end part of a second bobbin 53 into which a second coil 54 is inserted is adjusted to the opening 51a of the cylindrical part 51 of a second ore 50. Thus, the magnetic circuit of the first coil 44 and the magnetic circuit of the second coil 54 become states approximated to a uniform state in spite of the types of the devices and the dispersion of detection precision between the devices is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor device for detecting the material and shape of a coin, which is mounted on a circulation type coin processing device or the like which automatically performs coin depositing / dispensing processing in an automatic teller machine. About.

[0002]

2. Description of the Related Art A financial institution such as a bank is provided with a circulating coin processing apparatus for automatically performing a deposit and withdrawal process of coins in an automatic teller machine. When receiving coins, the coin processing device accepts the deposited coins, identifies the authenticity of the deposited coins and identifies the denomination, and stores the deposited coins in a denomination safe. At the time of withdrawal, coins of a required denomination are taken out from a denomination-type safe, the authenticity and the denomination are identified, and then paid out.

Further, the coin processing apparatus has a forced conveying means for forcibly conveying the coin while pressing the coin against a conveying surface with a conveying belt, and also for discriminating the authenticity and denomination of the conveyed coin. A coin identification device is provided with a so-called inspection unit.

The inspection unit includes an optical sensor for optically detecting the outer diameter of a coin, a magnetic sensor for magnetically detecting the material of the coin, and the like. FIG. 10 shows an example of the magnetic sensor.
In FIG. 10, a magnetic sensor 101 of a reflected magnetic flux amount detection type is arranged on a transport surface 100 on which a coin C is forcibly transported.
The magnetic sensor 101 includes a cylindrical core 102, a columnar core 103,
A bobbin 104 inserted between the inner periphery of the cylindrical core 102 and the outer periphery of the columnar core 103, a first coil (detection side coil) 105 and a second coil (non-detection side coil) wound around the bobbin 104. ) 106 is provided. Cylindrical core 102, columnar core 10
3. The three pieces of the bobbin 104 are positioned and fixed to each other.

[0005] The first coil 105 and the second coil 106 are
A bridge circuit is connected together with a variable resistor (not shown) for balance adjustment. A sine wave signal is applied to this bridge circuit, and a voltage difference between the respective coils is subjected to signal processing and converted into a digital signal. Based on this digital signal, the physical quantity of the coin C, for example, the shape (shape with hole,
Shape without holes) and material (aluminum: 1 yen coin, bronze: 10 yen coin, brass: 5 yen coin, bronze: 50 yen coin, 100 yen coin, 5
00 coin) is detected.

[0006]

As the cylindrical core 102 and the columnar core 103 of the magnetic sensor 101, a soft ferrite core having a small AC loss is usually used. However,
This soft ferrite core has a problem that the dimensional tolerance after molding is large (that is, the dimensional variation between lots is large).

In order to solve this problem, it is necessary to carry out polishing after molding, but there is a new problem that the cost is greatly increased. If the cylindrical core 102 and the columnar core 103 were not polished after the molding, the shape of the bobbin 104 would be substantially uniform. Therefore, as shown in FIG. A distance d protrudes from the end face of the core 103, or FIG.
The bobbin 104 has a cylindrical core 102 and a columnar core 10
3 may be recessed from the end face portion to the inner side by a distance e.

A magnetic circuit of the first coil 105 on the detection side and a magnetic circuit of the second coil 106 on the non-detection side are indicated by broken lines, respectively. These magnetic circuits are completely different between the case of FIG. 11 and the case of FIG. State.

As described above, a magnetic circuit different for each sensor appears as a variation in detection accuracy for each sensor. In order to eliminate the variation in the detection accuracy for each sensor, it is necessary to widen the balance adjustment range of the variable resistor of the bridge circuit.

However, if the balance adjustment range is wide, there is a problem that adjustment becomes difficult. The present invention has been made in view of the above circumstances, and its object is to eliminate the need for polishing after molding of the core, and to eliminate the need for a wide balance adjustment range of the bridge circuit, and to reduce the physical quantity of coins. It is an object of the present invention to provide a highly reliable magnetic sensor device capable of detecting with high accuracy without variation among devices.

[0011]

Means for Solving the Problems First Invention (Claim 1)
The magnetic sensor device is disposed on a coin transport surface, has a tubular portion having an opening on a side corresponding to the transport surface and having a bottom surface on the opposite side, and a cylindrical portion substantially at the center of the bottom surface of the tubular portion. A first core having a columnar portion reaching an opening of the first portion;
A first bobbin inserted between the cylindrical portion and the columnar portion of the core and aligned with the opening of the cylindrical portion of the first core, and a first coil wound around the first bobbin And a cylindrical portion fixed to the bottom surface of the cylindrical portion of the first core, having a bottom surface on the side fixed to the first core and having an opening on the opposite side, and substantially the bottom surface of the cylindrical portion. A second core having a columnar portion extending from the center to the opening of the cylindrical portion, and an end portion aligned between the cylindrical portion of the second core and the columnar portion and at the opening of the cylindrical portion of the second core. A second bobbin inserted in the state, a second coil wound around the second bobbin, and a bridge circuit formed by connecting the first coil and the second coil together with a variable resistor for balance adjustment. Detecting means for detecting the physical quantity of the coin according to the output of the bridge circuit.

A magnetic sensor device according to a second aspect of the present invention is arranged so that the axial direction is substantially perpendicular to the coin transport surface, and an opening is provided at an axial end corresponding to the transport surface. And a first core having a cylindrical portion having a bottom surface at an opposite axial end portion, and a columnar portion extending substantially from the center of the bottom surface of the cylindrical portion to an opening of the cylindrical portion along the axial direction. And this first
A first bobbin inserted between the inner periphery of the cylindrical portion of the core and the outer periphery of the columnar portion and aligned with the opening of the cylindrical portion of the first core, and wound around the first bobbin; The first coil and the bottom surface of the cylindrical portion of the first core are coaxially fixed,
A cylindrical portion having a bottom surface at an axial end portion on a side fixed to the first core and having an opening at an opposite axial end portion, and extending along an axial direction from substantially the center of the bottom surface of the cylindrical portion; A second core having a columnar portion reaching the opening of the cylindrical portion; and an end between the inner periphery of the cylindrical portion of the second core and the outer periphery of the columnar portion and at the opening of the cylindrical portion of the second core. A second bobbin fitted in a state where the parts are aligned, a second coil wound around the second bobbin, and the first coil and the second coil connected together with a variable resistor for balance adjustment. A bridge circuit; and a detecting means for detecting a physical quantity of the coin in accordance with an output of the bridge circuit.

In the magnetic sensor device according to the first and second inventions, the end of the first bobbin in which the first coil is inserted is aligned with the opening of the cylindrical portion of the first core, and the second coil is inserted. Since the end of the second bobbin is aligned with the opening of the cylindrical portion of the second core, the magnetic circuit of the first coil and the magnetic circuit of the second coil are nearly uniform regardless of the device,
Variations in detection accuracy between devices are eliminated.

According to a third aspect of the present invention, in the magnetic sensor device according to the first or second aspect, the first core and the second core are soft ferrite cores. A magnetic sensor device according to a fourth invention (claim 4) is the magnetic sensor device according to the first or second invention, wherein the bottom surface of the cylindrical portion of the first core and the bottom surface of the cylindrical portion of the second core are provided for positioning each other. An uneven portion was provided.

According to a fifth aspect of the present invention, there is provided the magnetic sensor device according to the first or second aspect, wherein a coil is provided at a predetermined portion from the bottom surface to the side surface of each of the cylindrical portions of the first core and the second core. An opening was provided to lead the conductor.

According to a sixth aspect of the present invention, there is provided a magnetic sensor device which is disposed on a coin transport surface, has a cylindrical portion having an opening on a side corresponding to the transport surface and a bottom surface on the opposite side, and A first core having a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion; and a first core between the inner periphery of the cylindrical portion of the first core and the outer periphery of the columnar portion. A first bobbin inserted into the opening of the cylindrical portion of the one core so that the end thereof is aligned with the first bobbin;
A first coil wound on a bobbin, a cylindrical portion disposed on the bottom surface of the cylindrical portion of the first core, having a bottom surface on a side fixed to the first core, and having an opening on the opposite side; A second core having a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion; and between the inner periphery of the cylindrical portion of the second core and the outer periphery of the columnar portion. The second bobbin inserted into the opening of the cylindrical portion of the second core so that the ends thereof are aligned, the second coil wound around the second bobbin, the first coil and the second coil are balanced. It comprises a bridge circuit connected together with a variable resistor for adjustment, and a detecting means for detecting a physical quantity of the coin in accordance with an output of the bridge circuit.

A magnetic sensor device according to a seventh aspect of the present invention is arranged so that the axial direction is substantially vertical to the coin transport surface, and an opening is provided at an axial end corresponding to the transport surface. And a first core having a cylindrical portion having a bottom surface at an opposite axial end portion, and a columnar portion extending substantially from the center of the bottom surface of the cylindrical portion to an opening of the cylindrical portion along the axial direction. And this first
A first bobbin inserted between the inner periphery of the cylindrical portion of the core and the outer periphery of the columnar portion and aligned with the opening of the cylindrical portion of the first core, and wound around the first bobbin; The first coil and the coaxial direction with respect to the bottom surface of the cylindrical portion of the first core,
A cylindrical portion having a bottom surface at an axial end portion on a side fixed to the first core and having an opening at an opposite axial end portion, and extending along an axial direction from substantially the center of the bottom surface of the cylindrical portion; A second core having a columnar portion reaching the opening of the cylindrical portion; and an end between the inner periphery of the cylindrical portion of the second core and the outer periphery of the columnar portion and at the opening of the cylindrical portion of the second core. A second bobbin fitted in a state where the parts are aligned, a second coil wound around the second bobbin, and the first coil and the second coil connected together with a variable resistor for balance adjustment. A bridge circuit; and a detecting means for detecting a physical quantity of the coin in accordance with an output of the bridge circuit.

In the magnetic sensor devices according to the sixth and seventh inventions, the end of the first bobbin into which the first coil is inserted is aligned with the opening of the cylindrical portion of the first core, and the second coil is inserted. Since the end of the second bobbin is aligned with the opening of the cylindrical portion of the second core, the magnetic circuit of the first coil and the magnetic circuit of the second coil are nearly uniform regardless of the device,
Variations in detection accuracy between devices are eliminated.

According to an eighth aspect of the present invention, in the magnetic sensor device according to the sixth or seventh aspect, the magnetic sensor device is provided between the bottom surface of the cylindrical portion of the first core and the bottom surface of the cylindrical portion of the second core. And a substrate having an opening for positioning each bottom surface by the fitting.

In a ninth aspect of the present invention, in the magnetic sensor device according to the ninth aspect, the substrate is a wiring board having a wiring pattern for connection to the conductors of the first coil and the second coil.

According to a tenth aspect of the present invention, in the magnetic sensor device according to the eighth aspect, the bottom surface of the cylindrical portion of the first core and the bottom surface of the cylindrical portion of the second core fit into the opening of the substrate. It has a step-shaped part that fits and abuts the periphery of the opening.

In a magnetic sensor device according to an eleventh aspect of the present invention, in the sixth or seventh aspect, the first core and the second core are soft ferrite cores. The magnetic sensor device according to the twelfth invention (claim 12) is the sixth or seventh magnetic sensor device.
In the invention of (1), an opening for leading a coil conductor is provided at a predetermined portion from the bottom surface to the side surface of each of the cylindrical portions of the first core and the second core.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 4 shows a configuration of a circulation type coin processing device mounted on an automatic teller machine (ATM) or the like.

Reference numeral 1 denotes a rotatable tray as a deposit and withdrawal port.
At the time of deposit, coins of various mixed denominations to be processed are input from the outside of the apparatus, and at the time of deposit, coins of various mixed denominations to be paid out of the apparatus are released. Saucer 1
When the coins are inserted, the coins received by rotation are dropped on the upper feeding portion 2 of the centrifugal disk structure disposed vertically below. The upper feeding section 2 separates the coins dropped from the tray 1 by centrifugal force and controls the coins by a height regulating guide (not shown) provided at the outlet of the disk 2a to feed coins one by one.

A pickup roller 3 is disposed slightly downstream of the exit of the disk 2a of the upper feeding section 2, and a conveyance path 4 as conveyance means for forcibly conveying coins fed by the pickup roller 3 is adjacent to the pickup roller 3. Coins are conveyed one by one at a predetermined pitch according to the rotational speed ratio of the two.

Normally, since the upper feeding portion 2 has a higher coin feeding ability, coins are connected almost continuously before the pickup roller 3. Subsequent coin (outside diameter: D
ia) is driven at the rotation speed of the pick-up roller 3, and the leading coin is driven at the transport speed of the downstream transport path 4 during the time it advances by its own diameter, so that the coin transport pitch Xin
t is: Xint = (V2 · Dia) / V1 V1: Upstream drive speed (rotation speed of pickup roller 3) V2: Downstream drive speed (rotation speed of transport path 4)

The pick-up roller 3 is arranged obliquely with respect to the direction of the transport path in order to send the coins to the transport reference surface of the transport surface 5 described later. This width-shifting action is essential for detecting a jagged pattern on the side of a coin.

The conveying path 4 forcibly conveys the coins fed from the upper feeding section 2 while pressing the coins onto the conveying surface 5 by the conveying belt 6, and sends the coins to an inspection section 7 provided as a coin identification device disposed downstream. send. The inspection unit 7 identifies the authenticity, type, and the like of the conveyed coin by detection and determination processing described later.

The coins passing through the inspection section 7 are transported again to the transport path 4
Is forcibly conveyed further downstream, and sent to the sorting unit 8 disposed downstream. The sorting unit 8 sorts coins transported by the transport path 4 into denominations (by type) based on the identification result of the inspection unit 7. The sorting section 8 is composed of, for example, well-known opposed gates 9,..., And selectively opens and closes the gates 9,.

The coins sorted by the sorting unit 8 are put into denomination safes (denomination accumulation) 10,... As denomination accumulation units disposed therebelow, and are sorted and accumulated by denomination. You.

The rejected coins are denominated cash 10
It is guided to a downstream transport path 12 via a U-turn transport path 11 disposed downstream of the container, and is returned to the tray 1 by the downstream transport path 12.

When the denomination safe 10 is full, an overflow box 13 for storing excess coins is provided in the inspection unit 7.
Coins are inserted by a well-known opposed gate 14 or the like.

When the overflow box 13 is full, for example, the safe 15 provided downstream of the sorting unit 8
The excess coins are collected by a well-known facing gate 16 or the like. It should be noted that when refilling coins from outside the apparatus, refill coins are inserted into the safe 15.

When a predetermined number of coins are not stored in the cash-type safe 10, the safe 15
, A replenishment operation to the denomination safe 10 is performed. That is, a coin dispensing section (not shown) constituted by a reciprocating picker and the like provided at the lower portion of the safe 15 takes out a specified number of coins from the safe 15 and feeds the lower portion disposed below the denomination safe 10. Put into the unit 17. The lower feeding portion 17 is
It has a centrifugal disk structure similar to that of the upper feeding section 2.

The lower feeding section 17 feeds out coins thrown out of the safe 15 one by one and sends them to a sandwich type vertical conveyor 18 constituted by a flat belt or the like. Conveyed to section 2. The coins conveyed to the upper dispensing unit 2 are dispensed one by one in the same manner as described above, are conveyed on the conveying path 4, and after the authenticity and the type are identified in the inspection unit 7,
It is stored in the denomination safe 10 by the sorting unit 8.

The above is the description of the deposit processing system for performing coin deposit processing. Next, the dispensing processing system for performing coin dispensing processing will be described. In the dispensing process, coins are taken out from the denomination safe 10 and paid out to the tray 1. That is,
A coin dispensing section 19,... Constituted by a reciprocating picker and the like disposed below each denomination safe 10, takes out a designated number of coins from each denomination safe 10,. Are discharged to the lower feeding portion 17 disposed below the.

The lower pay-out section 17 is provided for each denomination safe 10,.
Coins thrown out of the conveyor 18
And is conveyed to the upper feeding section 2 via the vertical conveyor 18. The coins conveyed to the upper dispensing unit 2 are dispensed one by one in the same manner as described above and conveyed on the conveyance path 4, and after checking the type and quantity in the inspection unit 7, conveyed to the most downstream by the disbursed instruction number, It is guided to the downstream transport path 12 via the U-turn transport path 11, and is discharged to the tray 1 by the downstream transport path 12.

Incidentally, reference numeral 20 denotes a temporary holding section for temporarily holding the dispensed coins and the like, and reference numeral 21 denotes a foreign substance collection box for collecting foreign substances.
Incidentally, the inspection unit 7 is provided so as to sandwich the transport surface (sapphire glass plate or ceramic plate) 5 and the transport belt 6, and an optical sensor for detecting the outer diameter of the coin C; An optical sensor for detection and a magnetic sensor 30 for detecting the physical quantity of the coin C are provided. The configuration of the magnetic sensor 30 is shown in FIGS.
(a), (b), and (c) are shown in FIGS. 3 (a), (b), and (c). FIG. 1 is a cross-sectional view of the overall structure, FIGS. 2A, 2B, and 2C are structures of the first core, and FIGS.
(b) and (c) show the configuration of the second core, respectively.

As shown in the figure, a magnetic sensor 30 of a reflected magnetic flux amount detection type is arranged on the transport surface 5 on which the coin C is forcibly transported. The magnetic sensor 30 includes a first core 40 and a second core 50.

The first core 40 is, for example, a soft ferrite core having a small AC loss. The first core 40 is arranged in a state where the axial direction is substantially vertical with respect to the transport surface 5, and is provided at an axial end corresponding to the transport surface 5. A cylindrical portion (cylindrical) 41 having an opening 41a and a bottom surface 41b at the opposite axial end is provided, and the cylindrical portion is formed along the axial direction from substantially the center of the bottom surface 41b of the cylindrical portion 41. A columnar portion (cylindrical shape) 42 reaching the opening 41a of 41 is provided. Note that the tip end surface of the columnar portion 42 forms the same plane as the opening surface (opening 41 a) of the cylindrical portion 41.

The opening 41 a of the cylindrical portion 41 is provided between the inner periphery of the cylindrical portion 41 of the first core 40 and the outer periphery of the columnar portion 42.
The first bobbin 43 is fitted so that the ends are aligned with the (and the end surface of the columnar portion 42). The first bobbin 43 has a first bobbin 43
A coil (detection side coil) 44 is wound.

An opening 41d for leading the lead wire 44a of the first coil 44 out of the sensor is formed in the bottom surface 4 of the cylindrical portion 41.
It is formed at a predetermined portion from 1b to the side surface. The second core 50 is a soft ferrite core having a small AC loss, for example, similar to the first core 40, and is coaxially fixed to the bottom surface 41 b of the cylindrical portion 41 of the first core 40, and is fixed to the first core 40. Cylindrical part 5 having a bottom surface 51b at the axial end on the side to be formed and having an opening 51a at the opposite axial end
1 and a columnar portion 52 extending from substantially the center of the bottom surface 51b of the cylindrical portion 51 to the opening 51a of the cylindrical portion 51 along the axial direction. Note that the tip end surface of the columnar portion 52 forms the same plane as the opening surface (opening 51a) of the cylindrical portion 51.

The opening 51a of the cylindrical portion 51 is provided between the inner periphery of the cylindrical portion 51 of the second core 50 and the outer periphery of the columnar portion 52.
The second bobbin 53 is inserted so that the end portion is aligned with (and the end surface of the columnar portion 52). The second bobbin 53 includes a second bobbin.
A coil (non-detection side coil) 54 is wound.

An opening 51 d for leading the conducting wire 54 a of the second coil 54 out of the sensor is formed on the bottom surface 5 of the cylindrical portion 51.
It is formed at a predetermined portion from 1b to the side surface. Also,
A concave portion 41c for positioning is formed on the outer periphery of the bottom surface 41b of the cylindrical portion 41 in the first core 40. A convex portion 51c for positioning is also formed on the outer periphery of the bottom surface 51b of the cylindrical portion 51 in the second core 50. The engagement between the concave portion 41c and the convex portion 51c causes the first core 40
When fixing the first core 40 and the second core 50, the cylindrical portion 41 of the first core 40 and the second core 5 can be positioned.
0 and the cylindrical portion 51 can be reliably and easily fixed coaxially.

With respect to the magnetic sensor 30 having such a configuration,
The control circuit of FIG. 5 is added to configure the magnetic sensor device of the present invention. That is, as shown in FIG. 5, one end of each of the first coil 44 and the second coil 54 is commonly connected and grounded, and the other end is connected to a variable resistor 60 for balance adjustment.
Are connected to both ends. The sliding terminal of the variable resistor 60 is connected to one end of a transmitter 61 that emits a sine wave signal (for example, several tens KHz to several hundred KHz), and the other end of the transmitter 61 is grounded. The connection of the first coil 44, the second coil 54, and the variable resistor 60 forms the bridge circuit 31.

The output of the bridge circuit 31, that is, the voltage generated at each connection point between each of the coils 44 and 54 and both ends of the variable resistor 60 is amplified by the amplifier circuits 62 and 63 and rectified by the rectifier circuits 64 and 65. It is rectified, further smoothed by low-pass filters 66 and 67, and supplied to a differential amplifier 68. The output of the differential amplifier 68 is a low-pass filter 6
9, the signal is converted into a digital signal by an A / D converter 70, and is output to the CPU 71 as output data of the magnetic sensor.
Supplied to

The CPU 71 is supplied with not only the output data of the magnetic sensor 30 but also the output data of the optical sensor for detecting the outer diameter and the output data of the optical sensor for detecting the uneven shape.

The CPU 71 stores a control program and determination reference data for performing detection processing such as the outer diameter of the coin C and the shape of the side surface irregularities.
2. RAM for storing various data such as input data
73. A DSP (Digital DSP) for performing high-speed arithmetic processing of image data relating to detection of physical quantities of the coin C, for example, a shape (a shape with a hole, a shape without a hole) and a material (magnetic property).
A signal processor 74 is connected.

The CPU 71 comprehensively identifies the authenticity and the type of the coin C by processing according to each output data, and as a main functional means relating to the magnetic sensor 30, uses the output data of the magnetic sensor 30 Detection of physical quantities such as shapes (shape with holes and shape without holes) and materials (aluminum: 1 yen coin, bronze: 10 yen coin, brass: 5 yen coin, bronze: 50 yen coin, 100 coins, 500 yen coin) Means.

Next, the operation of the magnetic sensor device will be described. Normally, in the bridge circuit 31, the balance is adjusted by operating the variable resistor 60 (output zero adjustment of the differential amplifier 68).
Is performed. Then, as the coin C passes through the transport surface 5, the magnetic field linked to the first coil 44 on the detection side is pushed down by the eddy current generated on the surface of the coin C, and the magnetic field is reduced. The output signal of the differential amplifier 68 rises.

The output signal of the magnetic sensor 30 (the output signal of the differential amplifier 68) is supplied to the tip of the first core 40 (opening 4).
The waveform is determined according to the gap from the position 1a) to the surface of the coin C and the material (magnetic property) of the coin C. FIG. 6 shows an example of the waveform of this output signal.

Since the magnetic sensor 30 is excited by a relatively high sine wave signal of several tens KHz to several hundred KHz, the magnetic flux does not penetrate into the coin C but is reflected on the surface of the coin C. Therefore, the shape of the coin C (hole presence / absence detection) can be magnetically detected.

Whether the coin C has a hole or no hole is often detected by the dent ratio of the output signal waveform.
For example, if a dent of 70% or more with respect to the first peak value is confirmed, it is recognized that there is a hole, and otherwise, it is recognized that there is no hole.

When the frequency of the sine wave signal emitted from the oscillator 61 is relatively high, such as several tens KHz to several hundred KHz, as described above, since the magnetic field hardly penetrates from the coin surface, only the surface shape is detected. If the frequency of the sine wave signal is set relatively low, the material (aluminum ... 1 yen coin, bronze ...
10 yen coin, brass… 5 yen coin, white copper… 50 yen coin, 100 yen coin, 500 yen coin) can be detected.

On the other hand, regarding the configuration of the magnetic sensor 30, the end of the first bobbin 43 into which the first coil 44 is inserted is the opening 41 a of the cylindrical portion 41 of the first core 40 (and the end surface of the columnar portion 42). And the end of the second bobbin 53 into which the second coil 54 is inserted is connected to the cylindrical portion 5 of the second core 50.
1 and the end faces of the columnar portions 52. Therefore, even if the dimensional tolerances of the cores 40 and 50 are large, the cores 40 and 50 need not be polished after the molding, and can be detected on the detection side. The magnetic circuit of the first coil 44 and the magnetic circuit of the second coil on the non-detection side can be kept almost uniform regardless of the magnetic sensor. This eliminates variations in detection accuracy between the magnetic sensors.

That is, the physical quantity of the coin C can be detected with high accuracy without variation among devices, and reliability can be improved. Therefore, polishing after the cores 40 and 50 are formed becomes unnecessary, and a large increase in cost can be avoided. A high-performance magnetic sensor can be obtained at low cost.

Further, it is not necessary to widen the balance adjustment range of the variable resistor 60 in the bridge circuit 31, so that the balance adjustment (the output zero adjustment of the differential amplifier 68) by operating the variable resistor 60 becomes easy.

In the above embodiment, the case where the first core 40 and the second core 50 are directly fixed has been described as an example, but FIGS. 7 and 8 (a), (b), (c) and FIG. As shown in FIGS. 9 (a), (b), and (c), the first core 40 and the second core 50 may be indirectly fixed with a printed wiring board (PC board) 80 interposed therebetween. 7 shows a cross section of the overall configuration, FIGS. 8 (a), (b) and (c) show the configuration of the first core, and FIGS. 9 (a), (b) and (c) show the configuration of the second core, respectively. .

The wiring board 80 is formed on the bottom surface 41 b of the cylindrical portion 41.
And an opening 81 for positioning the bottom surface 51b of the tubular portion 51 by the fitting thereof, and the first coil 4
The fourth wiring 44a has a wiring pattern for connection to the conductive wire 44a on the upper surface, and the second coil 54 has a wiring pattern for connection to the conductive wire 54a on the lower surface.

Conductors 44a and 54a are connected by soldering to the wiring patterns on the upper and lower surfaces of wiring substrate 80, respectively. A flange portion 41e is formed on the bottom surface 41b of the cylindrical portion 41 so as to surround the bottom surface 41b, and a step-shaped portion 41f connected to the flange portion 41e is formed on the wiring board 8.
0 is fitted into the opening 81 from the upper surface side and abuts on the periphery of the opening 81.

A flange 51e is also formed on the bottom surface 51b of the tubular portion 51 so as to surround the periphery thereof, and a step-shaped portion 51f connected to the flange 51e is formed on the wiring board 8b.
0 is fitted into the opening 81 from the lower surface side and abuts on the periphery of the opening 81.

According to such a configuration, the tubular portion 41 of the first core 40 and the second portion of the second core 40 are sandwiched between the opening 81 of the wiring board 80 and the both sides thereof.
By mounting the tubular portions 51 of the core 50, the tubular portions 41 and 51 can be reliably and easily fixed coaxially.

In addition, the first coil 44 is inserted into the first
The end of the bobbin 43 is connected to the opening 4 of the cylindrical portion 41 of the first core 40.
1a (and the end face of the columnar portion 42) and the second
Since the end of the second bobbin 53 into which the coil 54 is inserted is aligned with the opening 51a of the cylindrical portion 51 of the second core 50 (and the end surface of the columnar portion 52), even if the dimensional tolerance of the cores 40 and 50 is small. Even if it is large, the first coils 44 on the detection side need not be polished after the cores 40 and 50 are molded.
And the magnetic circuit of the second coil on the non-detection side can be maintained in a nearly uniform state regardless of the magnetic sensor. This eliminates variations in detection accuracy between the magnetic sensors.

That is, the physical quantity of the coin C can be detected with high accuracy without variation among devices, and reliability can be improved. The present invention is not limited to the above embodiment, and various modifications can be made without changing the gist.

[0065]

As described above, according to the present invention, the end of the first bobbin into which the first coil is inserted is aligned with the opening of the cylindrical portion of the first core, and the second coil is inserted. Since the end of the second bobbin is configured to be aligned with the opening of the cylindrical portion of the second core, there is no need for polishing after molding of the core, and there is no need to widen the balance adjustment range of the bridge circuit. It is possible to provide a highly reliable magnetic sensor device capable of detecting the physical quantity of coins with high accuracy without variation among devices.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a magnetic sensor according to an embodiment and a peripheral portion thereof.

FIGS. 2A and 2B show a configuration of a first core in the embodiment, wherein FIG. 2A is a plan view, FIG. 2B is a cross-sectional view, and FIG.

FIGS. 3A and 3B show a configuration of a second core in the embodiment, wherein FIG. 3A is a plan view, FIG. 3B is a cross-sectional view, and FIG.

FIG. 4 is a diagram showing a configuration of an automatic teller machine according to the embodiment.

FIG. 5 is a block diagram showing a configuration of a control circuit of the embodiment.

FIG. 6 is a view showing an example of a waveform of an output signal of the magnetic sensor of the embodiment.

FIG. 7 is a sectional view showing a configuration of a modification of FIG. 1;

FIG. 8 shows a configuration of a first core in FIG. 7;
(a) is a plan view, (b) is a cross-sectional view, and (c) is a side view.

9 shows a configuration of a second core in FIG. 7,
(a) is a plan view, (b) is a cross-sectional view, and (c) is a side view.

FIG. 10 is a cross-sectional view showing a configuration of a conventional magnetic sensor and its peripheral portion.

FIG. 11 is a view for explaining an example of dimensional variation of a core of the magnetic sensor of FIG. 10;

FIG. 12 is a view for explaining another example of the dimensional variation of the core of the magnetic sensor of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Automatic teller machine 4 ... Conveying path 5 ... Conveying surface 6 ... Conveying belt 7 ... Inspection part (coin identification device) 30 ... Magnetic sensor 31 ... Bridge circuit 40 ... 1st core 41 ... Cylindrical part 41a ... Opening 41b ... bottom surface 41c ... concave portion 41d ... opening 42 ... columnar portion 43 ... first bobbin 44 ... first coil 51 ... cylindrical portion 51a ... opening 51b ... bottom surface 51c ... concave shape portion 51d ... opening 52 ... columnar portion 53 ... First bobbin 54 First coil 68 Differential amplifier 71 CPU

Claims (12)

[Claims] 1. A cylindrical portion disposed on a coin transport surface, having an opening on a side corresponding to the transport surface, and having a bottom surface on an opposite side, and a substantially cylindrical shape from substantially the center of the bottom surface of the cylindrical portion. A first core having a columnar portion reaching the opening of the portion; and a first core inserted between the cylindrical portion and the columnar portion of the first core so that the ends are aligned with the opening of the cylindrical portion of the first core. A first bobbin; a first coil wound around the first bobbin; and a first coil fixed to a bottom surface of the cylindrical portion of the first core.
A cylindrical portion having a bottom surface on the side fixed to the core and having an opening on the opposite side, and a second core including a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion, A second bobbin inserted between the cylindrical portion and the columnar portion of the second core and in such a manner that an end thereof is aligned with an opening of the cylindrical portion of the second core, and wound around the second bobbin. A second coil, a bridge circuit connecting the first coil and the second coil together with a variable resistor for balance adjustment, and a detecting means for detecting a physical quantity of the coin according to an output of the bridge circuit; A magnetic sensor device comprising: 2. The coin is arranged so that its axial direction is substantially perpendicular to the transport surface of the coin, has an opening at an axial end corresponding to the transport surface, and has a bottom surface at the opposite axial end. A first core including a cylindrical portion having a cylindrical portion extending from a substantially center of a bottom surface of the cylindrical portion to an opening of the cylindrical portion along an axial direction; and an inner periphery of the cylindrical portion of the first core. A first bobbin fitted between the first bobbin and the outer periphery of the columnar portion and with an end aligned with the opening of the cylindrical portion of the first core; a first coil wound around the first bobbin; A cylindrical portion fixed coaxially to the bottom surface of the cylindrical portion of the first core, having a bottom surface at the axial end on the side fixed to the first core and having an opening at the opposite axial end. And a second core having a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion along the axial direction, and a cylindrical shape of the second core. A second bobbin inserted between the inner periphery of the second member and the outer periphery of the columnar portion and with the end aligned with the opening of the cylindrical portion of the second core; and the second coil wound around the second bobbin A bridge circuit connecting the first coil and the second coil together with a variable resistor for balance adjustment; and a detecting means for detecting a physical quantity of the coin in accordance with an output of the bridge circuit. A magnetic sensor device characterized by the above-mentioned. 3. The magnetic sensor device according to claim 1, wherein the first core and the second core are soft ferrite cores. 4. The method according to claim 1, wherein a concave-convex portion for positioning is provided on a bottom surface of the cylindrical portion of the first core and a bottom surface of the cylindrical portion of the second core. 2
6. The magnetic sensor device according to claim 1. 5. An opening for leading a coil conductor is provided at a predetermined portion from a bottom surface to a side surface of each of the cylindrical portions of the first core and the second core. Item 3. A magnetic sensor device according to item 2. 6. A cylindrical portion disposed on a coin transport surface, having an opening on a side corresponding to the transport surface, and having a bottom surface on an opposite side, and a substantially cylindrical shape from substantially the center of the bottom surface of the cylindrical portion. A first core having a columnar portion reaching the opening of the portion, and an end aligned with the opening of the cylindrical portion of the first core between the inner periphery of the cylindrical portion of the first core and the outer periphery of the columnar portion. A first bobbin fitted in the state, a first coil wound around the first bobbin, and a first coil disposed on the bottom surface of the cylindrical portion of the first core.
A cylindrical portion having a bottom surface on the side fixed to the core and having an opening on the opposite side, and a second core including a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion, A second bobbin inserted between the inner periphery of the cylindrical portion of the second core and the outer periphery of the columnar portion and aligned with the opening of the cylindrical portion of the second core; A second coil wound around the bridge, a bridge circuit connecting the first coil and the second coil together with a variable resistor for balance adjustment, and detecting a physical quantity of the coin according to an output of the bridge circuit. A magnetic sensor device, comprising: 7. A coin is arranged so that its axial direction is substantially perpendicular to the conveying surface of the coin, and has an opening at an axial end corresponding to said conveying surface and a bottom surface at an opposite axial end. A first core including a cylindrical portion having a cylindrical portion extending from a substantially center of a bottom surface of the cylindrical portion to an opening of the cylindrical portion along an axial direction; and an inner periphery of the cylindrical portion of the first core. A first bobbin inserted between the first bobbin and the outer periphery of the columnar portion and with the end aligned with the opening of the cylindrical portion of the first core; a first coil wound around the first bobbin; A cylindrical portion disposed coaxially with the bottom surface of the cylindrical portion of the first core, having a bottom surface at an axial end fixed to the first core and having an opening at an opposite axial end. And a second core having a columnar portion extending from substantially the center of the bottom surface of the cylindrical portion to the opening of the cylindrical portion along the axial direction, and a cylindrical shape of the second core. A second bobbin inserted between the inner periphery of the second member and the outer periphery of the columnar portion and with the end aligned with the opening of the cylindrical portion of the second core; and the second coil wound around the second bobbin A bridge circuit connecting the first coil and the second coil together with a variable resistor for balance adjustment; and a detecting means for detecting a physical quantity of the coin in accordance with an output of the bridge circuit. A magnetic sensor device characterized by the above-mentioned. 8. A bottom surface of the cylindrical portion of the first core and the second core.
8. The magnetic sensor device according to claim 6, wherein a substrate having an opening for positioning each bottom surface by fitting the bottom surface with the bottom surface of the cylindrical portion of the core is provided. 9. The magnetic sensor device according to claim 8, wherein the substrate is a wiring substrate having a wiring pattern for connecting to the conductors of the first coil and the second coil. 10. The bottom surface of the cylindrical portion of the first core and the bottom surface of the cylindrical portion of the second core have a stepped portion that fits into the opening of the substrate and abuts on the periphery of the opening. 9. The magnetic sensor device according to claim 8, wherein: 11. The magnetic sensor device according to claim 6, wherein the first core and the second core are soft ferrite cores. 12. An opening for leading a coil conductor is provided at a predetermined portion from a bottom surface to a side surface of each of the cylindrical portions of the first core and the second core. Item 8. A magnetic sensor device according to item 7.