KR102116120B1 - Appratus for identifying metallic foreign components - Google Patents

Abstract

Metal foreign matter detection apparatus according to the present invention includes a conveying unit for conveying the detected object; A feature extracting unit for extracting features of the object to be detected; A magnetization unit disposed on the conveyance path of the object to be detected, and magnetizing a metal foreign material mixed in the object to be detected; A first sensor disposed on a rear end of the magnetization portion on the transport path and generating a first output signal according to electromagnetic induction of the detected object; A second sensor disposed on a rear end of the magnetization portion on the transport path, exhibiting a magnetic field characteristic different from that of the first sensor, and generating a second output signal according to electromagnetic induction of the detected object; A control unit generating a switching control signal for selecting one of the first output signal and the second output signal according to the characteristics of the detected object extracted by the feature extraction unit; And a switch for switching one of the first output signal and the second output signal to the control unit according to the switching control signal, wherein the feature extracting unit detects at least one of a barcode reader, a weight meter, a color sensor, and an optical sensor. It can contain one. Accordingly, it is configured to select a detection result from one of the plurality of sensors according to the physical characteristics or conditions of the object to be detected, thereby improving the detection sensitivity of the metal foreign object to the object to be detected.

Description

Metal foreign substance detection device {APPRATUS FOR IDENTIFYING METALLIC FOREIGN COMPONENTS}

The present invention relates to an apparatus for detecting foreign substances, and more particularly, to an apparatus for detecting foreign substances that improves the detection sensitivity of metal foreign substances incorporated in food.

The metal foreign substance detector is a device that detects metal foreign substances mixed in inspection products such as food, and it detects the residual magnetic strength of the metal foreign substance magnetized by an optical detection method using X-rays, an eddy current method using a high-frequency magnetic field, and a magnetization means. There is an electromagnetic induction method that detects with a magnetic sensor operating as an electromagnetic induction phenomenon.

Faraday's law of electromagnetic induction is generalized by the formula of ε=-N(dΦ/dt) (unit:V), and the induced electromotive force (ε) is proportional to the rate of change of the magnetic flux (Φ) with the number of coil windings and time.

At this time, in order to easily detect the signal generated by the movement of the foreign material, since the number of times the coil is wound is unchanged, the movement speed of the metal foreign matter passing through the magnetic field must be increased, or the degree of magnetization of the metal foreign matter must be increased. However, since the moving speed of the metal foreign material is dependent on the conveying speed of the conveyor belt, there is a practical limitation in increasing the moving speed of the metal foreign material. Therefore, the conventional metal foreign matter detection apparatus improves detection sensitivity mainly by magnetizing a metal foreign material to sense a signal.

By the way, as the inspection products, there are the inspection stand products of the relatively thin packaging paper made of aluminum-deposited paper and the inspection stand products of the relatively thick packaging paper of the aluminum foil re-dilating. However, the conventional metal foreign matter detector detects the metal foreign matter by using one sensor regardless of the thickness of the package of the inspection target product.

Korean Registered Patent No. 10-1046946 (Registration Date: June 30, 2011)

The present invention has been devised in view of the above problems, and an object of the present invention is to provide a metal foreign matter detection apparatus capable of obtaining optimal detection performance for a plurality of inspection target products having different characteristics.

Metal foreign object detection apparatus according to the present invention for achieving the above object, a conveying unit for conveying the detected object; A feature extracting unit for extracting features of the object to be detected; A magnetization unit disposed on the conveyance path of the object to be detected, and magnetizing a metal foreign material mixed in the object to be detected; A first sensor disposed on a rear end of the magnetization portion on the transport path and generating a first output signal according to electromagnetic induction of the detected object; A second sensor disposed on a rear end of the magnetization portion on the transport path, exhibiting a magnetic field characteristic different from that of the first sensor, and generating a second output signal according to electromagnetic induction of the detected object; A control unit generating a switching control signal for selecting one of the first output signal and the second output signal according to the characteristics of the detected object extracted by the feature extraction unit; And a switch for switching one of the first output signal and the second output signal to the control unit according to the switching control signal, wherein the feature extracting unit detects at least one of a barcode reader, a weight meter, a color sensor, and an optical sensor. It can contain one.

The first sensor and the second sensor include a first sensor coil and a second sensor coil, respectively, and each of the first sensor coil and the second sensor coil has two protruding members at both ends, and in the width direction A core having a C-shaped cross section, a conductor wire wound around each of the two protruding members, and a magnetization that is disposed at an upper end of the two protruding members to generate a magnetic field for magnetization to magnetize metal foreign matter contained in the inspected object. Dragon magnet; may be included.

In the first sensor coil, the number of turns of the conductor wire or the thickness or width of the two protruding members of the core may be different from the second sensor coil.

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The first sensor or the second sensor may include at least one amplifier that amplifies the first output signal or the second output signal; At least one filter for filtering noise in the first output signal or the second output signal amplified by the amplifier; And at least one converter that converts a signal that has passed through the at least one filter into a digital signal.

The characteristic of the object to be detected may indicate at least one of the physical characteristics of the object including the material, thickness, or weight of the packaging material of the object to be detected, and information on the object to be detected, including a barcode for identifying the object. Can be.

The apparatus for detecting foreign substances may further include a display unit that visually displays selection of the first output signal and the second output signal, or visually or audibly indicates whether metal foreign matter is mixed.

The metal foreign substance detection device may further include a storage unit in which characteristics of the object to be detected and detection sensitivity of the first sensor and the second sensor are stored correspondingly.

The apparatus for detecting a foreign object according to an embodiment of the present invention configured as described above is configured to select a detection result from one of a plurality of sensors according to physical characteristics or conditions of the object to be detected, including a plurality of sensors It is possible to improve the detection sensitivity of the metal foreign matter to the object to be detected.

1 is a perspective view of a metal foreign matter detection apparatus according to an embodiment of the present invention.
Figure 2 is a block diagram showing the configuration of a metal foreign matter detection apparatus according to an embodiment of the present invention.
3 is a view showing the configuration of the first sensor and the second sensor according to an embodiment of the present invention.
4 is a cross-sectional view of a sensor coil according to an embodiment of the present invention.
5 is a view showing examples of the detected object of the apparatus for detecting a foreign material of the present invention.

The invention will be described in detail with reference to the accompanying drawings, which show specific embodiments in which the invention may be practiced. With respect to the specific embodiments shown in the accompanying drawings, it will be described in detail sufficient for those skilled in the art to practice the present invention. Embodiments other than specific embodiments are different from each other, but need not be mutually exclusive. In addition, it should be understood that the detailed description below is not intended to be taken in a limiting sense.

The detailed description of specific embodiments shown in the accompanying drawings will be read in connection with the accompanying drawings, and the drawings are regarded as part of the description of the entire invention. References to orientation or directivity are for convenience of explanation only and are not intended to limit the scope of the present invention in any way.

Specifically, the term "down, up, horizontal, vertical, upper, lower, upward, downward, upper, lower" and the like, or derivatives thereof (eg, "horizontal, downward, upward") Etc.) should be understood with reference to all the drawings and related descriptions being described. In particular, since these relative words are only for convenience of explanation, it is not required that the apparatus of the present invention be configured or operated in a specific direction.

In addition, the term "removed, attached, connected, continued, interconnected", etc., refers to a mutual coupling relationship between components, unless otherwise stated, individual components are attached or connected or fixed or indirectly. It can mean, and it should be understood as a term encompassing a movable, attachable, connected, fixed, as well as non-movable state.

In addition, the thickness or size of each component illustrated in the accompanying drawings is exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. That is, the size of each component does not entirely reflect the actual size.

1 is a perspective view of a metal foreign matter detection apparatus according to an embodiment of the present invention. The apparatus for detecting foreign substances shown in FIG. 1 is composed of a transport unit 120, a magnetization unit 130, a first sensor 300-1, and a second sensor 300-2, and controls their operation. A control unit (not shown) is provided.

The conveying unit 100 has a function of conveying the detected object 10 in a predetermined direction, and may be a mechanical device such as a conveyor belt. In FIG. 1, the detected object 10 placed on the conveying unit 120 is conveyed in the direction of the arrow. The rotational speed of the motor (not shown) driving the conveying unit 120 determines the conveying speed of the conveying unit 120, and the moving speed of the detected object 10 is a motor (not shown) driving the conveying unit 120. Time). The control unit (not shown), which will be described later, controls the rotation speed of the motor (not shown) to adjust the moving speed of the detected object 10 placed on the transport unit 120. Here, the detected object 10 may be food, clothing, and the like, but is not limited thereto.

The magnetization unit 130 is disposed at a predetermined position on the transport path of the object to be detected 10, and the first sensor 300-1 and the second sensor 300-2 are rear ends of the magnetization unit 130 in the transport path. Is placed on. That is, as illustrated in FIG. 1, the magnetization unit 130, the first sensor 300-1, and the second sensor 300-2 are disposed at predetermined intervals along the transport direction of the transport unit 120. . The detected object 10 passes through the magnetization unit 130, the first sensor 300-1, and the second sensor 300-2 along the transport path of the transport unit 100.

The magnetization unit 130 serves to magnetize metal foreign substances that may be mixed in the detected object 10. As shown in FIG. 1, the magnetization unit 130 has a rectangular rim shape having a hollow area through which the transport unit 120 passes and surrounds the transport unit 120. The magnetization unit 130 is made of a strong magnet, and magnetizes a metal foreign material in the object 10 to be passed therebetween. Of course, the magnetization unit 130 may be made of any configuration other than a strong magnet, as long as it can magnetize metal materials and the like.

When the metal foreign matter mixed in the detected object 10 is magnetized while passing through the magnetization unit 130, the detection sensitivity of the first sensor 300-1 or the second sensor 300-2 that passes thereafter is passed. Can be elevated.

Specifically, Faraday's law of electromagnetic induction is generalized by the formula of ε=-N(dΦ/dt) (unit:V), and the induced electromotive force (ε) depends on the number of turns of the coil and the rate of change of the magnetic flux (Φ) with time. Proportional, at this time, when the metal foreign matter mixed in the object 10 is magnetized, the magnitude of the induced electromotive force is increased, so the detection of the first sensor 300-1 or the second sensor 300-2 Sensitivity can be improved.

In addition, the control unit (not shown) may improve the detection sensitivity of the first sensor 300-1 or the second sensor 300-2 by increasing the rate of change of the magnetic flux density by increasing the moving speed of the transport unit 120. .

In FIG. 1, in order to help the understanding of the present invention, the configuration of the metal foreign matter detection apparatus according to the present invention is simplified, but in addition to the illustrated configuration, a motor (not shown) or a control unit for driving the transport unit 120 130) Elements, such as a power supply unit (not shown) for supplying driving power to each element, including a driving element, may be added.

Figure 2 is a block diagram showing the configuration of a metal foreign matter detection apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus for detecting a foreign object according to an embodiment of the present invention includes a feature extraction unit 110, a transport unit 120, a magnetization unit 130, and a first sensor 300 -1), a second sensor 300-2, and a control unit 200 for determining whether or not metal foreign substances in the object 10 are mixed while controlling the configuration.

The first sensor 300-1 is disposed at the rear end of the magnetization unit 120 on the transport path and generates a first output signal according to electromagnetic induction of the detected object 10.

The second sensor 300-2 is disposed at the rear end of the magnetization part on the transport path, exhibits a different magnetic field characteristic from the first sensor, and generates a second output signal according to electromagnetic induction of the detected object.

3 shows the configuration of the first sensor 300-1 and the second sensor 300-2.

Referring to FIG. 3, the first sensor 300-1 includes a first sensor coil 310-1, a first amplifier 330-1, a first filter 340-1, and a first ADC (Analog- Digital converter) (350-1). The second sensor 300-2 includes a second sensor coil 310-2, a second amplifier 330-2, a first filter 340-2, and a second analog-digital converter (ADC) 350- 2).

The first sensor coil 310-1 or the second sensor coil 310-2 has a substantially similar configuration. Therefore, the configuration of the first sensor coil 310-1 will be mainly described.

The first sensor coil 310-1 has a rectangular rim shape having a cavity area through which the conveying part 120 passes and surrounds the conveying part 120. The first sensor coil 310-1 may include an upper sensor coil (not shown) and a lower sensor coil (not shown). The upper sensor coil functions to generate a magnetic field, and the lower sensor coil functions to receive it. A large magnetic flux is generated by the magnetic field generated by the upper sensor coil, and the lower sensor coil senses the induced electromotive force signal generated when the magnetic flux of the metal foreign material in the detected object 10 changes, so that the metal in the detected object 10 It can be detected whether water has been incorporated.

The upper sensor coil and the lower sensor coil have a structure in which a copper wire is wound around an iron core, and one end of the upper sensor coil is connected to one end of the lower sensor coil of the entrance, and the other end of the lower sensor coil sensing the induced electromotive force signal is It may be connected to a first amplifier, which will be described later.

The first sensor coil 310-1 having such a configuration may have a configuration shown in FIG. 4.

4 is a cross-sectional view of a sensor coil according to an embodiment of the present invention.

Referring to FIG. 4, the first sensor coil 310-1 includes a core 301 having a C-shaped cross section in the width direction and conductors 303 and 304 wound around the core 301. The core 301 has two protruding members 301a, 301b at both ends.

The conductor wires 303 and 304 are wound around the two protruding members 301a and 301b. When a current is applied to the conductors 303 and 304 wound around the core 301, a magnetic field for detection is generated. Two magnetization magnets 307 and 308 are disposed on top of the two protruding members 301a and 301b of the core 301 so as to generate a magnetic field for magnetization in the range of the detection magnetic field. The magnetic field for magnetization generated by the magnets 307 and 308 for magnetization may magnetize the foreign metal contained in the object 10 to be inspected.

The second sensor coil 310-2 has the same components as the first sensor coil 310-1, but may be configured to exhibit different magnetic field characteristics. For example, the number of times the winding of the first sensor coil 310-1 is wound may be different from that of the second sensor coil 310-2. In another embodiment, the first sensor coil 310-1 may have a different thickness or width of the two protruding members 301a and 301b of the core 301 than the second sensor coil 310-2.

Since the first sensor coil 310-1 has different magnetic field characteristics from the second sensor coil 310-2, different detection results can be generated for the object to be detected.

Meanwhile, the first output signal sensed by the first sensor coil 310-1 of the first sensor 300-1 is transmitted to the first amplifier 330. In this case, the first amplifier 330-1 may be configured in a form in which a single OP-AMP or a plurality of OP-AMPs are connected. The first output signal amplified by the first amplifier 330-1 passes through the first filter 340-1, and noise corresponding to a predetermined frequency is removed, and at this time, the first filter 340- 1) may be formed of a notch filter or the like that absorbs and attenuates only a specific frequency. The first output signal having the noise attenuated through the first filter 340-1 is converted into a digital signal through a first analog to digital converter (ADC) 350-1 and output.

Meanwhile, the second output signal sensed by the second sensor coil 310-2 of the second sensor 300-2 is transmitted to the second amplifier 330-2. At this time, the second amplifier 330-2 may be configured in a form in which a single OP-AMP or a plurality of OP-AMPs are connected. The second output signal amplified by the second amplifier 330-2 passes through the second filter 340-2, and noise corresponding to a predetermined frequency is removed, and at this time, the second filter 340- 2) may be formed of a notch filter or the like that absorbs and attenuates only a specific frequency. The second output signal with the noise attenuated passing through the second filter 340-2 is converted into a digital signal through a second analog to digital converter (ADC) 350-2 and output.

Referring back to FIG. 2, the feature extraction unit 110 to extract the feature of the object 10 can be extracted. The feature extracting unit 110 may include a barcode reader, a weight meter, a color sensor, and an optical sensor.

For example, the barcode reader can read the barcode of the object 10 to extract information of the object 10 to be detected. The barcode of the detected object 10 can identify the detected object 10. In this case, it is possible to know the thickness, material, and the like of the wrapping paper of the object 10 to be detected corresponding to the barcode.

Alternatively, the weight meter, color sensor, or light sensor may extract physical properties of the object 10, the material or thickness of the package of the object to be detected, and the weight of the object to be detected.

The detected feature extraction unit 110 extracts the physical characteristics of the detected object 10 or the information of the detected object 10 and outputs it to the MCU 220 of the control unit 200.

The control unit 200 may include an MCU 220, a switch 230, a storage unit 240, an input unit 250, and a display unit 260. However, in other embodiments, each configuration may be implemented as a separate configuration, and only some configurations may be implemented as separate configurations.

MCU 220 is the first output signal output from the first sensor 300-1 and the second sensor 300-2 according to the characteristics of the detected object 10 provided from the detected object feature extraction unit 110 And generating a switching control signal for selecting one of the second output signals and providing it to the switch 230.

In another embodiment, the MCU 220 selects one of the first output signal and the second output signal output from the first sensor 300-1 and the second sensor 300-2 by the user from the input unit 250. In order to generate a switching control signal to provide it to the switch 230.

In this embodiment, the MCU 220 receives the first output signal and the second output signal converted into digital signals, but in another embodiment, the first converter 350-1 and the second converter 350-2 The configuration of is omitted or otherwise arranged, it is also possible to receive the analog signal passing through the first filter 340-1 and the second filter 340-2 as it is.

When the MCU 220 generates a switching control signal for selecting one of the first output signal and the second output signal, information stored in the storage unit 240 may be used.

The storage unit 240 may store the detection sensitivity of the first sensor 300-1 and the second sensor 300-2 in advance according to the thickness of the package to be detected. The detection sensitivity can indicate the minimum size of a detectable specimen.

5 is a view showing examples of the detected object of the apparatus for detecting a foreign material of the present invention.

Referring to FIG. 5, (a) is a sample 1 aluminum vapor deposition film packaging neck, the measurement thickness of the wrapping paper is 0.1 mm, (b) is a sample 2 aluminum foil packaging instant food, and the measurement thickness of the packaging paper is 0.15 mm. Is, (c) is a sample 3 aluminum foil lunch box, the measurement thickness of the wrapping paper is 0.4mm.

The detection sensitivity of the first sensor 300-1 and the second sensor 300-2 for these samples was tested, and the results were derived as shown in Table 1 below. As a condition of this test, a sample without a metal foreign material should not have a detection reaction when passing the conveying part 120 of the metal foreign material detection device, and the metal foreign material for checking detection sensitivity uses a regular hexagonal specimen made of iron. The length of one side was defined as the size of the specimen.

In Table 1, the detection sensitivity represents the minimum size of the detectable specimen.

sample Packaging material Detection sensitivity by the first sensor Detection sensitivity by the second sensor Sample 1 Aluminum deposition film 1.0mm 2.0mm Sample 2 Aluminum foil1 3.0mm 2.0mm Sample 3 Aluminum foil 2 3.0mm 2.0mm

As shown in Table 1, it can be seen that the detection sensitivity of the first sensor 300-1 and the second sensor 300-2 is different. For sample 1, the detection sensitivity of the first sensor 300-1 is better for the second sensor 300-2, and for sample 2 and sample 3, the detection sensitivity of the second sensor 300-2 is first. The sensor 300-1 was better.

The MCU 220 outputs the first output from the first sensor 300-1 based on the physical characteristics of the detected object 10 provided from the detected object feature extraction unit 110 or information on the detected object 10. The switching control signal for selecting one of the signal and the second output signal from the second sensor 300-2 is output to the switch 230 to control switching.

The switch 230 switches between the first output signal from the first sensor 300-1 and the second output signal from the second sensor 300-2 according to the switching control signal provided from the MCU 220. In other words, the switch 230 switches one of the first output signal and the second output signal to the MCU 220 of the control unit 200.

The storage unit 240 not only stores the detection sensitivity of the first sensor 300-1 and the second sensor 300-2 according to the thickness of the package of the object to be detected, but also detects the sensitivity according to the physical characteristics or conditions of the object to be detected. Can be saved.

MCU 220 is the first output signal of the first sensor (300-1) and the second of the second sensor (300-2) according to the physical characteristics or conditions of the detected object provided from the feature extraction unit 110 A switching control signal for selecting one of the output signals can be generated.

In this embodiment, the metal foreign substance detection apparatus includes two sensors 300-1 and 300-2, but it is apparent to those skilled in the art that it may include three or more sensors. For example, the apparatus for detecting a foreign object may generate a switching control signal that selects one of the output signals according to the physical characteristics or conditions of the object to be detected.

On the other hand, if it is determined that the metal object is contained in the object 10 to be detected 10, the MCU 220 may display it to the user through an audible or visual indication. The display unit 260 may be a device such as a display for visual display or a device such as a speaker for audible display.

The display unit 260 may visually display selection of the first output signal and the second output signal. As described above, one of the output signals of the first sensor 300-1 and the second sensor 300-2 may be selected by the user. When a metal foreign object is continuously detected for a plurality of objects 10 having the same physical characteristics, an optimal detection performance among the first sensor 300-1 and the second sensor 300-2 by the user It is possible to select a sensor indicating. In this case, the display unit 260 may visually display the selection of the first output signal and the second output signal.

In addition, although the input unit 250 and the display unit 260 are illustrated in FIG. 2 as separate components, it may be implemented as a touch screen capable of simultaneously performing input and output.

The apparatus for detecting a foreign object according to an embodiment of the present invention configured as described above is configured to select a detection result from one of a plurality of sensors according to physical characteristics or conditions of the object to be detected, including a plurality of sensors It is possible to improve the detection sensitivity of the metal foreign matter to the object to be detected.

In other words, the conventional metal foreign matter detection apparatus has the detection sensitivity as shown in Table 2 below.

sample Packaging material Detection sensitivity
(Minimum size of detectable specimen) Sample 1 Aluminum deposition film 1.0mm Sample 2 Aluminum foil 3.0mm Sample 3 Aluminum foil 3.0mm

The detection sensitivity of the conventional metal foreign matter detection apparatus shown in [Table 2] is inferior to that of the metal foreign substance detection apparatus of the present invention shown in [Table 1]. Can be.

In other words, the metal foreign matter detection apparatus of the present invention was able to obtain the optimum detection performance for Sample 1 (the object to be detected of the aluminum deposition film material) by the first sensor 300-1, and the second sensor ( According to 300-2), optimal detection performance was obtained in Sample 2 and Sample 3 (detected material made of aluminum foil). Therefore, when the first sensor 300-1 and the second sensor 300-2 are selectively used for detection according to the physical properties of the object to be detected (for example, packaging material), improved detection compared to the conventional metal foreign matter detection device Performance can be obtained.

In the above, the present invention has been described in terms of specific embodiments including preferred embodiments of the present invention, but those skilled in the art to which the present invention pertains may make various substitutions or modifications in the configuration of the invention described above. You can predict. In addition, structural and functional modulation may be variously performed without departing from the scope and technical spirit of the present invention. Accordingly, the spirit or scope of the present invention will be broadly understood as set forth in the claims appended hereto.

120 ‥‥‥‥‥‥‥‥‥‥Barrier
130………………………………
300-1 ‥‥‥‥‥‥‥‥‥ 1st sensor
300-2 ‥‥‥‥‥‥‥‥‥ Second sensor
200 ‥‥‥‥‥‥‥‥‥‥Control part

Claims (8)

A conveying unit for conveying the detected object;
A feature extracting unit for extracting features of the object to be detected;
A magnetization unit disposed on the conveyance path of the object to be detected, and magnetizing a metal foreign material mixed in the object to be detected;
A first sensor disposed on a rear end of the magnetization portion on the transport path and generating a first output signal according to electromagnetic induction of the detected object;
A second sensor disposed on a rear end of the magnetization portion on the transport path, exhibiting magnetic field characteristics different from the first sensor, and generating a second output signal according to electromagnetic induction of the detected object;
A control unit generating a switching control signal for selecting one of the first output signal and the second output signal according to the characteristics of the detected object extracted by the feature extraction unit; And
And a switch for switching one of the first output signal and the second output signal to the control unit according to the switching control signal,
The feature extracting unit of the detected object is a metal foreign matter detection device including at least one of a barcode reader, a weight meter, a color sensor, and an optical sensor.
delete According to claim 1,
The first sensor and the second sensor each include a first sensor coil and a second sensor coil,
Each of the first sensor coil and the second sensor coil
It has two protruding members at both ends, a core having a C-shaped cross section in the width direction, a conductor wire wound around the two protruding members, and an upper end of the two protruding members, thereby generating a magnetic field for magnetization. It includes a magnet for magnetizing to magnetize the metal foreign matter contained in the object to be detected,
The first sensor coil is a metal foreign matter detection device in which the number of turns of the conducting wire or the thickness or width of the two protruding members of the core is different from the second sensor coil.
delete According to claim 1,
The first sensor or the second sensor
At least one amplifier amplifying the first output signal or the second output signal;
At least one filter for filtering noise in the first output signal or the second output signal amplified by the amplifier; And
And at least one converter that converts a signal that has passed through the at least one filter into a digital signal.
According to claim 1,
The feature of the object to be detected indicates at least one of information on the object to be detected, including a physical characteristic of the object including the material, thickness, or weight of the package of the object to be detected and a barcode to identify the object to be detected. , Foreign metal detection device.
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