Gate-type metal detector

Abstract

The present invention relates to a door-type metal detector, comprising: first and second door frames (100) (100') arranged spaced apart from each other to form a passage (P) for a person to enter and exit; first and second metal detection modules (200) (200') assembled to the first and second door frames (100) (100'), which generate an inductive magnetic field to generate eddy currents in metals carried by a person entering and exiting the passage (P), and receive a magnetic field generated in conjunction with the eddy currents; and first and second detection alarm units (300) (300') that generate an alarm light or an alarm sound when metals are detected by the first and second metal detection modules (200) (200').

Description

Technology Field

[0001] The present invention relates to a door-type metal detector installed at an entrance, and more specifically, to a door-type metal detector capable of quickly detecting whether a person passing through the passage between the first and second door frames forming the door is carrying metal objects. Background Technology

[0002] Generally, pattern metal detectors are installed in various locations requiring security, such as airport arrival and departure halls, seaports, military bases, advertising centers, and event venues, and are used to detect whether entrants are carrying metal objects, such as weapons.

[0003] The metal detector comprises a detector body in which a pair of spaced-apart door frames are connected in an arch shape to form a passageway, a coil detection unit installed inside each of a pair of side plates to generate an induced magnetic field for generating eddy currents in metals and to receive a magnetic field generated in conjunction with the eddy currents, an operating circuit unit that supplies power to the coil detection unit to generate an induced magnetic field and analyzes the received magnetic field, and an alarm unit that generates an alarm sound when metals are detected.

[0004] The coil detection section is implemented by winding a coil onto a plastic frame-shaped jig with a length of approximately 40 to 50 cm, and the operating circuit section is implemented by installing electrical components on a PCB.

[0005] This type of metal detector can detect metal objects when a person carrying metal passes through a passageway. The coil detection unit generates an induced magnetic field and receives the magnetic field generated from the metal objects carried by the person in conjunction with this. When metal objects are detected, the alarm unit emits a warning light or sound, allowing the manager to confirm the situation.

[0006] However, in such a walk-through metal detector, the coil detection part must wind the coil onto a rim jig with a length of approximately 40 to 50 cm, and the outer surface of the coil must be finished with tape or resin so that the wound coil does not sag, but this process took a lot of time.

[0007] In addition, about 40 coil detection units are installed on a pair of side plates. Since the coil detection units have a three-dimensional shape in which the coil is wound around a rim jig, a complex fastening process using multiple bolts was required to fix all the three-dimensional coil detection units to the side plates. In particular, since the coil detection units must be installed at precise intervals, a precise assembly process was required, and a lot of effort was required in this process.

[0008] In addition, a complex process was required to solder the coil input / output terminals extended from approximately 40 coil detection units to the operating circuit unit.

[0009] In addition, since the coil detection unit is implemented by winding the coil onto a rim jig with a length of approximately 40 to 50 cm, the coil may become misaligned with other coils during the process of winding it onto the long rim jig, and as a result, errors occurred in the performance of the manufactured coil detection unit. The problem to be solved

[0010] The present invention was created to achieve the above-mentioned purpose and aims to provide a gantry-type metal detector that can improve assemblability by assembling dozens of first and second metal detection modules for metal detection onto first and second square grooves formed in first and second door frames.

[0011] Another objective of the present invention is to provide a gantry-type metal detector that enables mass production by eliminating the process of winding a coil on a rim jig or connecting a coil detection unit and an operating circuit unit when manufacturing the first and second metal detection modules, and increases productivity by employing such first and second metal detection modules. means of solving the problem

[0012] To achieve the above objectives, the door-type metal detector according to the present invention comprises: first and second door frames (100) (100') arranged spaced apart from each other to form a passage (P) for a person to enter and exit; first and second metal detection modules (200) (200') assembled to the first and second door frames (100) (100'), which generate an inductive magnetic field to generate eddy currents in metals carried by a person entering and exiting the passage (P), and receive a magnetic field generated in conjunction with the eddy currents; and first and second detection alarm units (300) (300') that generate an alarm light or an alarm sound when metals are detected by the first and second metal detection modules (200) (200').

[0013] In the present invention, the first door frame (100) comprises a first panel (110) erected vertically on the ground, a first rectangular groove surface (120) formed to be embedded in the surface of the first panel (110) and having a rectangular shape in the vertical direction, a pair of first detachable support members (130) composed of a plurality of first female protrusions (131) formed repeatedly and facing each other on the vertical inner circumference of the first rectangular groove surface (120), and a first edge jig (140) detachably coupled to the pair of first detachable support members (130), having first male protrusions (141) formed at both ends that engage with the first female protrusions (131) and a first jig groove (142) formed on the inner surface into which the first metal detection module (200) is detachably fitted; The second door frame (100') comprises: a second panel (110') that is erected vertically on the ground; a second rectangular groove surface (120') formed to be embedded in the surface of the second panel (110') and having a rectangular shape in the vertical direction; a pair of second detachable support members (130') formed to face each other on the inner circumference of the second rectangular groove surface (120') and having a plurality of second female protrusions (131') that are repeatedly formed; and a second edge jig (140') that is detachably coupled to the pair of second detachable support members (130'), having a first male protrusion (141') formed at both ends that engages with the first female protrusion (131') and a second jig groove (142') formed on the inner surface into which the second metal detection module (200') is detachably fitted.

[0014] In the present invention, the first metal detection module (200) comprises a first PCB board (210) having a rectangular shape, a first coil pattern part (220) formed by patterning on both sides of the first PCB board (210) for generating an inductive magnetic field to generate eddy currents in metals and receiving a magnetic field generated in conjunction with the eddy currents, and a first operating circuit part (230) installed on one side of the first PCB board (210) and composed of electrical components for controlling the operation of the first coil pattern part (220); The second metal detection module (200') comprises: a second PCB board (210) having a rectangular shape; a second coil pattern section (220') formed by patterning on both sides of the second PCB board (210') to generate an inductive magnetic field for generating eddy currents in metals and to receive a magnetic field generated in conjunction with the eddy currents; and a second operating circuit section (230') installed on one side of the second PCB board (210') and composed of electrical components for controlling the operation of the second coil pattern section (220').

[0015] In the present invention, the first metal detection module (200) further includes a first entry detection sensor (240) installed on the other side of the first PCB board (210) and generating a first operation signal (C1) to operate the first operation circuit unit (230) when a person enters the passage (P); and the second metal detection module (200') further includes a second entry detection sensor (240') installed on the other side of the second PCB board (210') and generating a second operation signal (C2) to operate the second operation circuit unit (230') when a person enters the passage (P).

[0016] In the present invention, the first metal detection module (200) further includes a first detection signal generating unit (250) that generates a first detection signal (F1) to operate the first detection alarm unit (300) so that an alarm sound or alarm light is generated when metals are detected in the first coil pattern unit (220) while the first operation signal (C1) is generated; and the second metal detection module (200') further includes a second detection signal generating unit (250') that generates a second detection signal (F2) to operate the second detection alarm unit (300') so that an alarm sound or alarm light is generated when metals are detected in the second coil pattern unit (220') while the second operation signal (C2) is generated.

[0017] In the present invention, the first detection alarm unit (300) is installed vertically along the front side of the first door frame (100) and includes a plurality of first detection LEDs (310) that emit light in conjunction with each of the first metal detection modules (200) independently; a first detection receiving unit (320) that receives a first detection signal (F1) generated from each of the first metal detection modules (200); and a first LED operating unit (330) that emits a first detection LED (310) corresponding to the specific first metal detection module (200) when the first detection receiving unit (320) receives a first detection signal (F1) generated from the specific first metal detection module (200).

[0018] The second detection alarm unit (300') is installed vertically along the front side of the second door frame (100') and includes a plurality of first detection LEDs (310) that emit light in conjunction with each of the second metal detection modules (200') independently; a second detection receiving unit (320') that receives a second detection signal (F2) generated from each of the second metal detection modules (200'); and a first and second LED operating unit (330) (330') that emits a second detection LED (310') corresponding to the specific second metal detection module (200') when the second detection receiving unit (320') receives the second detection signal (F2) generated from the specific second metal detection module (200').

[0019] In the present invention, the first and second magnetic field shielding plates (400) (400') are further included to cover the first and second metal detection modules (200) (200') on both sides of the first and second door frames (100) (100').

[0020] In the present invention, the ceiling (500) is further included, which is coupled to the top of the first and second door frames (100) (100') and has an uninterruptible power supply (600) built in to supply power in the event of a power outage. Effects of the invention

[0021] In this way, according to the present invention, dozens of first and second metal detection modules (200) (200') capable of independently detecting metal can be assembled to first and second door frames (100) (100') via first and second rim jigs (140) (140'), and accordingly, the first and second metal detection modules (200) (200') can be fixed to the first and second door frames (100) (100') without using bolts, so the door-type metal detection device can be assembled very easily.

[0022] In addition, the first and second metal detection modules (200) (200') form a rectangular shape, the first and second PCB boards (210) (210'), the first and second coil pattern sections (220) (220') formed by patterning on both sides of the first and second PCB boards (210) (210'), and the first and second operating circuit sections (230) (230') installed on one side of the first and second PCB boards (210) (210') to control the operation of the first and second coil pattern sections (220) (220') form a single body, thereby eliminating the process of winding a coil multiple times on a plastic edge jig to manufacture a coil detection section as in the prior art, and subsequently finishing the wound coil with tape or resin to prevent it from unraveling, or the process of connecting the coil input / output terminals to the operating circuit section by soldering. The first and second metal detection modules (200) (200') can be easily manufactured, and accordingly, the gantry metal device can be manufactured more easily.

[0023] In addition, by employing the first and second detection alarm units (300) (300'), it is possible to identify the location of metal objects hidden by entrants, thereby enabling more reliable security. Brief explanation of the drawing

[0024] FIG. 1 is a perspective view of a walk-through metal detector according to the present invention. FIG. 2 is a drawing for explaining that the first and second magnetic field shielding plates are separated from the first and second door frames of FIG. 1. FIG. 3 is a drawing for explaining the configuration by extracting the first and second door frames of FIG. 2. FIG. 4 is a drawing for explaining the configuration of the first and second metal detection modules installed on the first and second door frames of FIG. 2, by extracting them. FIG. 5 is a drawing for explaining the first and second detection alarm units installed in the first and second door frames of FIG. 1. FIG. 6 is a drawing for explaining that the first and second metal detection modules are assembled to the first and second detachable support members of FIG. 3. FIG. 7 is a drawing for explaining that the first and second metal detection modules are densely arranged to generate a strong magnetic field in the first and second door frames of FIG. 6. Specific details for implementing the invention

[0025] Hereinafter, a walk-through metal detector according to the present invention will be described in detail with reference to the attached drawings.

[0026] In the following, terms designated as "upper" or "upper" may include not only those directly above in contact but also those above non-contact. Terms such as "first," "second," etc., may be used to describe various components, but the components should not be limited by these terms. Terms are used solely for the purpose of distinguishing one component from another. A singular expression includes a plural expression unless the context clearly indicates otherwise. Furthermore, when a part is described as "comprising" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, terms such as "...part," "module," etc., as used in the specification refer to a unit that performs at least one function or operation.

[0027] FIG. 1 is a perspective view of a door-type metal detector according to the present invention, and FIG. 2 is a drawing for explaining that the first and second magnetic field shielding plates are separated from the first and second door frames of FIG. 1.

[0028] A door-type metal detector according to the present invention comprises: first and second door frames (100) (100') arranged spaced apart from each other to form a passage (P) for a person to enter and exit; first and second metal detection modules (200) (200') assembled to the first and second door frames (100) (100'), which generate an inductive magnetic field to generate eddy currents in metals carried by a person entering and exiting the passage (P), and receive a magnetic field generated in conjunction with the eddy currents; and first and second detection alarm units (300) (300') that generate an alarm light or an alarm sound when metals are detected by the first and second metal detection modules (200) (200'). It is characterized by including first and second magnetic field shielding plates (400) (400') installed to cover first and second metal detection modules (200) (200') on both sides of the first and second door frames (100) (100'); and a ceiling (500) coupled to the top of the first and second door frames (100) (100') and having an uninterruptible power supply (600) built in to supply power in the event of a power outage.

[0029] The first and second magnetic field shielding plates (400) (400') are implemented with metals that block magnetic fields and cover both sides of the first and second door frames (100) (100') to prevent the first and second metal detection modules (200) (200') from malfunctioning due to external magnetic fields.

[0030] The ceiling (500) is joined to the top of the first and second door frames (100) (100') to form an arch-shaped passageway (P) overall.

[0031] The uninterruptible power supply (600) supplies the necessary power until AC power is restored from the grid or generator in situations where the electricity is suddenly cut off, such as a power outage.

[0032] Figure 3 is a drawing for explaining the configuration by extracting the first and second door frames of Figure 2.

[0033] The first door frame (100) comprises a first panel (110) that is erected vertically on the ground, a first rectangular groove surface (120) that is formed to be embedded in the surface of the first panel (110) and forms a rectangular shape in the vertical direction, a pair of first detachable support members (130) that are formed to face each other on the vertical inner circumference of the first rectangular groove surface (120) and are composed of a plurality of first female protrusions (131) that are repeatedly formed, and a first edge jig (140) that is detachably coupled to the pair of first detachable support members (130), has a first male protrusion (141) formed at both ends that engages with the first female protrusions (131), and a first jig groove (142) formed on the inner surface into which a first metal detection module (200) is detachably fitted.

[0034] The second door frame (100') comprises a second panel (110') that is erected vertically on the ground, a second rectangular groove surface (120') that is formed to be embedded in the surface of the second panel (110') and forms a rectangular shape in the vertical direction, a pair of second detachable support members (130') that are formed facing each other on the vertical inner circumference of the second rectangular groove surface (120') and are composed of a plurality of second female protrusions (131') that are repeatedly formed, and a second edge jig (140') that is detachably coupled to the pair of second detachable support members (130'), has a first male protrusion (141') formed at both ends that engages with the first female protrusion (131'), and a second jig groove (142') formed on the inner surface into which a second metal detection module (200') is detachably fitted.

[0035] The first and second square groove surfaces (120) (120') are formed by being immersed in the surface of the first and second panels (110) (110') and provide a space for accommodating the first and second edge jigs (140) (140') on which the first and second metal detection modules (200) (200') are assembled.

[0036] Since the first and second female protrusions (131) (131') are formed at regular intervals, the first and second male protrusions (141) (141') can be arranged in various positions, such as making the spacing between the first and second rim jigs 140) (140') constant or making them close, depending on the position where the first and second male protrusions (141) (141') are inserted into the first and second female protrusions (131) (131').

[0037] The first and second edge jigs (140) (140') form a single body when the first and second metal detection modules (200) (200') are fitted into the first and second jig grooves (142) (142'), and allow the first and second metal detection modules (200) (200') to be assembled to the first and second square groove surfaces (120) (120').

[0038] FIG. 4 is a drawing for explaining the configuration of the first and second metal detection modules installed in the first and second door frames of FIG. 2.

[0039] The first metal detection module (200) is installed on a first door frame (100) located on one side and comprises a first PCB board (210) having a rectangular shape, a first coil pattern section (220) formed by patterning on both sides of the first PCB board (210) for generating an inductive magnetic field to generate eddy currents in metals and receiving a magnetic field generated in conjunction with the eddy currents, a first operating circuit section (230) installed on one side of the first PCB board (210) and composed of electrical components for controlling the operation of the first coil pattern section (220), and a first entry detection sensor (240) installed on the other side of the first PCB board (210) that generates a first operating signal (C1) to operate the first operating circuit section (230) when a person enters the passage (P). It includes a first detection signal generating unit (250) that generates a first detection signal (F1) to operate a first detection alarm unit (300) so that an alarm sound or alarm light is generated when metals are detected in the first coil pattern unit (220) while the first operation signal (C1) is generated.

[0040] The second metal detection module (200') is installed on the second door frame (100') located on the other side and comprises a second PCB board (210) having a rectangular shape, a second coil pattern section (220') formed by patterning on both sides of the second PCB board (210') to generate an inductive magnetic field for generating eddy currents in metals and to receive a magnetic field generated in conjunction with the eddy currents, a second operating circuit section (230') installed on one side of the second PCB board (210') and composed of electrical components for controlling the operation of the second coil pattern section (220'), and a second operating signal (C2) installed on the other side of the second PCB board (210') to generate a second operating signal (C2) for operating the second operating circuit section (230') when a person enters the passageway (P). It includes a second detection signal generator (250') that generates a second detection signal (F2) to operate a second detection alarm unit (300') so that an alarm sound or alarm light is generated when metals are detected in the second coil pattern unit (220') while the second operation signal (C2) is generated.

[0041] On one side of the first and second PCB boards (210) (210'), the first and second operating circuit sections (230) (230') are installed to form a single body, and on the upper and lower surfaces of the other side, the first and second coil pattern sections (220) (220') are formed.

[0042] The first and second coil pattern sections (220) (220') are formed by exposing and etching the upper and lower surfaces of the first and second PCB boards (210) (210'), and the input / output terminals are connected to the first and second operating circuit sections (230) (230'). Since these first and second coil pattern sections (220) (220') are implemented by exposing and etching both sides of the first and second PCB boards (210) (210'), the first and second coil pattern sections (20) (20') can secure the same product reliability and have the ability to generate and receive a uniform magnetic field.

[0043] The first and second entry / exit detection sensors (240) (240') generate first and second operation signals (C1) (C2) to activate the first and second operation circuit sections (230) (230') when a person enters the passageway (P). By employing these first and second entry / exit detection sensors (240) (240'), it is possible to prevent the unnecessary generation of an induced magnetic field in the first and second coil pattern sections (220) (220'), which consume the most power, when the passageway (P) is empty.

[0044] The first and second metal detection modules (200) (200') are assembled into the first and second jig grooves (142) (142') of the first and second rim jigs (140) (140'), thereby forming a single body with the first and second rim jigs (140) (140'). Therefore, the installation position of the first and second metal detection modules (200) (200') is determined by the position in which the first and second male protrusions (141) (141') are inserted into the first and second female protrusions (131) (131').

[0045] FIG. 5 is a drawing for explaining the first and second detection alarm units installed in the first and second door frames of FIG. 1.

[0046] The first detection alarm unit (300) is installed vertically along the front side of the first door frame (100) and includes a plurality of first detection LEDs (310) that emit light in conjunction with each first metal detection module (200) independently, a first detection receiving unit (320) that receives a first detection signal (F1) generated from each first metal detection module (200), and a first LED operating unit (330) that emits a first detection LED (310) corresponding to the specific first metal detection module (200) when the first detection receiving unit (320) receives a first detection signal (F1) generated from the specific first metal detection module (200).

[0047] The second detection alarm unit (300') is installed vertically along the front side of the second door frame (100') and includes a plurality of first detection LEDs (310) that emit light in conjunction with each second metal detection module (200') independently, a second detection receiving unit (320') that receives a second detection signal (F2) generated from each second metal detection module (200'), and a first and second LED operating unit (330) (330') that emits a second detection LED (310') corresponding to the specific second metal detection module (200') when the second detection receiving unit (320') receives a second detection signal (F2) generated from the specific second metal detection module (200').

[0048] With this structure, for example, when metal is embedded in the right side of the entrant's upper body, a specific first metal detection module (200) positioned correspondingly on the upper right side generates a corresponding first operating signal (C1) that generates metal. Upon the first operating signal (C1), the first operating unit (330) can indicate that metal is embedded in the right side of the entrant's upper body by emitting a specific first LED (310) corresponding to the first operating signal (C1).

[0049] That is, by employing the first and second detection alarm units (300) (300'), it is possible not only to detect metal items carried by the entrant but also to know the location where they are carried.

[0050] FIG. 6 is a drawing for explaining how the first and second metal detection modules are assembled to the first and second detachable support members of FIG. 3.

[0051] In the first and second square groove surfaces (120)(120') of the first and second panels (110)(110'), the spacing of the first and second female protrusions (131)(131') constituting the first and second detachable support members (130)(130') is constant, and accordingly, when the first and second male protrusions (141)(141') are assembled to the first and second female protrusions (131)(131') at constant intervals, the spacing of the first and second rim jigs (140)(140') is constant.

[0052] FIG. 7 is a drawing to explain that the first and second metal detection modules are densely arranged to generate a strong magnetic field in the first and second door frames of FIG. 6.

[0053] When the passage (P) of the gantry-type metal detector of the present invention needs to be wide, for example, when a wheelchair or stroller passes through or when a specific large item needs to enter or exit, the strength of the magnetic field generated from the first and second door frames (100) (100') must be high in order to detect metals from objects passing through the wide passage (P). To this end, the first and second metal detection modules (200) (200') are densely arranged on the first and second square groove surfaces (120) (120').

[0054] In this way, according to the present invention, dozens of first and second metal detection modules (200) (200') capable of independently detecting metal can be assembled to first and second door frames (100) (100') via first and second rim jigs (140) (140'), and accordingly, the first and second metal detection modules (200) (200') can be fixed to the first and second door frames (100) (100') without using bolts, so the door-type metal detection device can be assembled very easily.

[0055] In addition, the first and second metal detection modules (200) (200') form a rectangular shape, the first and second PCB boards (210) (210'), the first and second coil pattern sections (220) (220') formed by patterning on both sides of the first and second PCB boards (210) (210'), and the first and second operating circuit sections (230) (230') installed on one side of the first and second PCB boards (210) (210') to control the operation of the first and second coil pattern sections (220) (220') form a single body, thereby eliminating the process of winding a coil multiple times on a plastic edge jig to manufacture a coil detection section as in the prior art, and subsequently finishing the wound coil with tape or resin to prevent it from unraveling, or the process of connecting the coil input / output terminals to the operating circuit section by soldering. The first and second metal detection modules (200) (200') can be easily manufactured, and accordingly, the gantry metal device can be manufactured more easily.

[0056] In addition, by employing the first and second detection alarm units (300) (300'), it is possible to identify the location of metal objects hidden by entrants, thereby enabling more reliable security.

[0057] The present invention has been described with reference to one embodiment illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Explanation of the symbols

[0058] 100, 100'... 1st and 2nd door frames 110, 110' ... 1st and 2nd panels 120, 120' ... 1st and 2nd square groove surfaces 130, 130' ... 1st and 2nd detachable support sections 131, 131' ... 1st and 2nd rock irregularities 140, 140' ... 1st and 2nd border jigs 141, 141' ... 1st and 2nd number protrusions 142, 142' ... 1st and 2nd jig grooves 200, 200' ... 1st and 2nd metal detection modules 210, 210' ... 1st and 2nd PCB boards 220, 220' ... 1st coil pattern section 230, 230' ... 1st operating circuit section 240, 240' ... 1st entry / exit detection sensor 250, 250' ... 1st and 2nd detection signal generating units 300, 300' ... 1st, 2nd Detection Alarm Unit 310 ... 1st, 2nd Detection LED 320 ... 1st and 2nd detection receivers 330, 330' ... 1st and 2nd LED operating units 400, 400' ... 1st, 2nd magnetic field shielding plate 500 ... ceiling 600 ... uninterruptible power supply

Claims

Claim 1 First and second door frames (100)(100') arranged spaced apart from each other to form a passage (P) for a person to enter and exit; first and second metal detection modules (200)(200') assembled to the first and second door frames (100)(100'), for generating an inductive magnetic field to generate eddy currents in metals carried by a person entering and exiting the passage (P), and for receiving a magnetic field generated in conjunction with the eddy currents; and first and second detection alarm units (300)(300') that generate an alarm light or alarm sound when metals are detected in the first and second metal detection modules (200)(200'); wherein the first door frame (100) comprises a first panel (110) erected vertically on the ground, a first rectangular groove surface (120) formed to be embedded in the surface of the first panel (110) and forming a rectangular shape in the vertical direction, a pair of first detachable support members (130) composed of a plurality of first female protrusions (131) that are repeatedly formed facing each other on the vertical inner circumference of the first rectangular groove surface (120), and a first male protrusion (141) formed at both ends that engages with the first female protrusions (131) and is detachably coupled to the pair of first detachable support members (130), and the inner surface It includes a first edge jig (140) having a first jig groove (142) into which a first metal detection module (200) is detachably fitted;The second door frame (100') comprises: a second panel (110') erected vertically on the ground; a second rectangular groove surface (120') formed to be embedded in the surface of the second panel (110') and having a rectangular shape in the vertical direction; a pair of second detachable support members (130') formed to face each other on the vertical inner circumference of the second rectangular groove surface (120') and consisting of a plurality of second female protrusions (131') that are repeatedly formed; and a second edge jig (140') detachably coupled to the pair of second detachable support members (130'), having first male protrusions (141') formed at both ends that engage with the first female protrusions (131') and a second jig groove (142') formed on the inner surface into which the second metal detection module (200') is detachably fitted. Walk-through metal detector; Claim 2 delete Claim 3 In claim 1, the first metal detection module (200) comprises a first PCB board (210) having a rectangular shape, a first coil pattern part (220) formed by patterning on both sides of the first PCB board (210) for generating an inductive magnetic field to generate eddy currents in metals and receiving a magnetic field generated in conjunction with the eddy currents, and a first operating circuit part (230) installed on one side of the first PCB board (210) and composed of electrical components for controlling the operation of the first coil pattern part (220); The above second metal detection module (200') comprises: a second PCB board (210) having a rectangular shape; a second coil pattern part (220') formed by patterning on both sides of the second PCB board (210') for generating an induced magnetic field to generate eddy currents in metals and receiving a magnetic field generated in conjunction with the eddy currents; and a second operating circuit part (230') installed on one side of the second PCB board (210') and composed of electrical components for controlling the operation of the second coil pattern part (220'). Claim 4 In paragraph 3, the first metal detection module (200) further includes a first entry detection sensor (240) installed on the other side of the first PCB board (210) and generating a first operation signal (C1) to operate the first operation circuit unit (230) when a person enters the passage (P); and the second metal detection module (200') further includes a second entry detection sensor (240') installed on the other side of the second PCB board (210') and generating a second operation signal (C2) to operate the second operation circuit unit (230') when a person enters the passage (P); characterized by a gantry-type metal detection device. Claim 5 In paragraph 3, the first metal detection module (200) further includes a first detection signal generating unit (250) that generates a first detection signal (F1) to operate the first detection alarm unit (300) so that an alarm sound or alarm light is generated when metals are detected in the first coil pattern unit (220) while the first operation signal (C1) is generated; and the second metal detection module (200') further includes a second detection signal generating unit (250') that generates a second detection signal (F2) to operate the second detection alarm unit (300') so that an alarm sound or alarm light is generated when metals are detected in the second coil pattern unit (220') while the second operation signal (C2) is generated; characterized by a walk-through metal detection device. Claim 6 In claim 5, the first detection alarm unit (300) is installed vertically along the front side of the first door frame (100) and includes a plurality of first detection LEDs (310) that emit light in conjunction with each of the first metal detection modules (200) independently, a first detection receiver (320) that receives a first detection signal (F1) generated from each of the first metal detection modules (200), and a first LED operating unit (330) that emits a first detection LED (310) corresponding to the specific first metal detection module (200) when the first detection receiver (320) receives a first detection signal (F1) generated from the specific first metal detection module (200); and the second detection alarm unit (300') is installed vertically along the front side of the second door frame (100') and each of the A gantry-type metal detector device characterized by comprising: a plurality of first detection LEDs (310) that emit light in conjunction with a second metal detection module (200') independently; a second detection receiver (320') that receives a second detection signal (F2) generated from each of the second metal detection modules (200'); and a first and second LED operating unit (330) (330') that emits a second detection LED (310') corresponding to the specific second metal detection module (200') when the second detection receiver (320') receives a second detection signal (F2) generated from the specific second metal detection module (200'). Claim 7 A door-type metal detector according to claim 1, further comprising first and second magnetic field shielding plates (400) (400') installed to cover the first and second metal detection modules (200) (200') on both sides of the first and second door frames (100) (100'). Claim 8 A door-type metal detector according to claim 1, further comprising a ceiling (500) coupled to the upper part of the first and second door frames (100) (100'), wherein an uninterruptible power supply (600) that supplies power in the event of a power outage is built into the ceiling.

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