KR20170120454A - Low Frequency Antenna and keyless entry system including the same - Google Patents

Abstract

A low frequency antenna module and a keyless entry system including the same are provided. A low-frequency antenna module according to an exemplary embodiment of the present invention is a low-frequency antenna module in which a plurality of coils are wound around X-axis, Y-axis and Z-axis orthogonal to each other, wherein a first coil is wound around the X- A magnetic core in which a second coil is wound around a Y axis; At least one terminal for electrical connection with the outside and at least one wire binding port for connecting any one of both ends of the coil to be coupled in a horizontal direction with respect to the magnetic core, And a plurality of wire guides spaced apart along the rim of the magnetic core so that the third coil can be wound.

Description

[0001] The present invention relates to a low-frequency antenna module and a keyless entry system including the same,

The present invention relates to a low frequency antenna module and a keyless entry system including the same, and more particularly, to a low frequency antenna module applicable to a keyless entry system for wirelessly operating locking or opening a door of a car, and a keyless entry system .

As the level of living has improved and the supply of cars has increased, the car has now become a necessity for daily life. As a result, there have been a lot of researches on various techniques for opening and starting a vehicle such as a car, a vehicle anti-theft device and a door of a vehicle. For example, a keyless entry method and a keyless start ).

The keyless entry method is a method in which the driver releases the door lock without operating any key or remote control. When the key is held in the body of the driver, the key is automatically transmitted to the electronic authentication device inside the vehicle and the lock is released when the data is authenticated.

More specifically, the modern keyless entry system, introduced in the 1980s, uses a circuit board, a coded RFID technology chip, a battery, and a small antenna. Dual batteries and small antennas are used to send signals to vehicles that are a few feet away.

The RFID chip embedded in the remote starter includes a selection of codes designed to work with the vehicle. When the unlock button is pressed, the remote starter will send the code with an instruction to open the car door. If the receiver activated simultaneously with the unlock button receives the code as expected, the vehicle will unlock and open the door and move according to the instructions, otherwise it will not respond. Such a keyless entry method is convenient for the user and is useful for preventing the theft.

An antenna module used in such a keyless entry system is generally configured such that a coil is wound around a bar-type ferrite core and a plurality of antenna modules are mounted at predetermined positions.

Accordingly, when the reception antenna of the smart key is constituted by a single antenna coil, the communication distance (the distance at which data can be received at the vehicle side) is extremely high depending on the positional relationship with the direction of the magnetic field generated in the transmission antenna of the vehicle And there is a problem that communication can not be performed in the worst case.

That is, the reception antenna built in the smart key has a problem that reception sensitivity becomes worse when the axial direction of the antenna coil and the direction of the magnetic field generated by the transmission antenna of the vehicle are parallel to each other and the reception sensitivity is good and when they are orthogonal to each other.

Therefore, it is necessary to provide a non-directional characteristic so that the signal transmitted from the vehicle at all times can be received in a stable state at the receiving antenna of the smart key regardless of the position of the vehicle with respect to the antenna.

However, when a receiving antenna is configured through a plurality of antenna coils, the installation space of the receiving antenna may be large. Therefore, if a plurality of antenna coils are arranged close to each other in a limited narrow space such as a smart key, There is a problem that can be deteriorated.

KR 10-1542000 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low frequency antenna module and a keyless entry system including the low frequency antenna module.

According to an aspect of the present invention, there is provided a low-frequency antenna module including a plurality of coils wound around an X-axis, a Y-axis and a Z-axis orthogonal to each other, wherein the first coil is wound around the X- A magnetic core in which a second coil is wound around an axis; At least one terminal for electrical connection with the outside and at least one wire binding port for connecting any one of both ends of the coil to be coupled in a horizontal direction with respect to the magnetic core, And a plurality of wire guides spaced apart along the rim of the magnetic core so that the third coil can be wound with the wire.

The magnetic core may include a first body on which the first coil is wound and a pair of second bodies integrally formed with the first body and on which the second coil is wound, The body may be formed to protrude from the upper surface and the lower surface of the first body at a predetermined height, respectively.

The protruding thickness of the second body protruding from the upper surface and the lower surface of the first body may be the same as the thickness of the first coil or may be thicker than the thickness of the first coil .

The wire guide may have a thickness that is relatively thicker than the thickness of the second body so that the wire guide protrudes from the upper surface and the lower surface of the second body at a predetermined height at the time of coupling with the magnetic core.

The protrusion thickness of the wire guide protruding from the upper surface and the lower surface of the second body may be the same as the thickness of the second coil or may be relatively thicker than the thickness of the second coil.

In addition, the plurality of wire guides may be formed by inserting a coil arrangement groove for receiving the third coil in an area in contact with the third coil.

The depth of the coil disposition groove may be the same as the thickness of the third coil or may be larger than the thickness of the third coil.

In addition, the wire binding apertures may be electrically connected to each other to match the terminals one-to-one.

Further, the terminals and the wire binding portions to be energized with each other can be formed of one conductive member.

The conductive member may be integrated with the wire guide through insert molding to partially expose the bottom surface of the wire guide to form the terminal and partially expose the side surface of the wire guide to form the wire binding aperture .

In addition, the wire guide may have an engagement groove formed therein for receiving a portion of the magnetic core, and the wire guide may be coupled to the magnetic core via the engagement groove.

Further, a part of the magnetic core inserted into the coupling groove may be the edge side of the magnetic core.

In addition, an adhesive member may be provided on the contact surface between the coupling groove and the magnetic core to prevent the wire guide from being separated from the magnetic core.

In addition, the wire guide may include at least one coupling hole having a predetermined length along the height direction and protruding outwardly, and the coupling hole may be inserted into an insertion groove formed along the height direction from one surface of the magnetic core .

The coupling grooves are formed in a pair spaced apart from each other at a predetermined distance along the height direction of the wire guide, and the insertion grooves are formed in the height direction from the upper surface and the lower surface of the magnetic core, May be provided.

In addition, the coupling hole may be provided to be elastically deformable by an external force.

The insertion groove is formed to have a cross-sectional shape including a first arc portion exceeding an area of a semicircle and open at one side. The engagement portion has a cross-sectional shape including a second arc portion smaller than a semicircular area, And a pair of elastic pieces spaced apart from each other.

In addition, a mark for displaying a reference position may be provided in any one of the plurality of wire guides.

The plurality of wire guides may be made of an insulator.

Meanwhile, the low-frequency antenna module may be embedded in a smart key, embedded in a portable terminal, or embedded in a wearable device such as a smart watch.

In another embodiment, the low-frequency antenna module of the receiver and the transmitter constituting the keyless entry system may be embedded in the receiver to implement a keyless entry system.

According to the present invention, the wire guide serves as a guide for guiding the winding position of the coil, and simultaneously serves as an electrical connection to the outside and a terminal for energizing the coil, so that the structure is simple and thin.

1 is a schematic view of a low-frequency antenna module according to an embodiment of the present invention,
FIG. 2 is a view showing a state in which a plurality of coils are removed in FIG. 1,
Figure 3 is a bottom view of Figure 2,
FIG. 4 is a view showing a state in which the wire guide and the magnetic core are separated from each other in FIG.
FIG. 5 is a cross-sectional view taken along line AA and BB in FIG. 2,
6 is a schematic view of a low frequency antenna module according to another embodiment of the present invention,
FIG. 7 is a view showing a state where a plurality of coils are removed in FIG. 6;
Figure 8 is a bottom view of Figure 7,
FIG. 9 is a view showing a state in which the wire guide and the magnetic material core are separated from each other in FIG. 7;
10 is an enlarged view of a coupling hole of a wire guide and an insertion groove of a magnetic core, which is applied to a low frequency antenna module according to another embodiment of the present invention;
11 is a view showing a state before coupling and a state after coupling between a coupling groove of a wire guide and an insertion groove of a magnetic core applied to a low frequency antenna module according to another embodiment of the present invention;
12 is a cross-sectional view in the CC direction of Fig. 7,
FIG. 13 is an illustration of a keyless entry system using a low-frequency antenna module according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1 and 6, the low frequency antenna module 100 and 200 according to an embodiment of the present invention includes a plurality of coils 111, 112 and 113, magnetic core 120 and 220, and a plurality of wire guides 130 and 230.

The plurality of coils 111, 112 and 113 are for generating a signal in a predetermined frequency band to perform low frequency communication and include a first coil 111, a second coil 112 and a third coil 113, Are arranged so as to be orthogonal to each other by being wound around the X-axis, the Y-axis and the Z-axis, which are orthogonal to each other.

For example, the first coil 111 may be wound a plurality of times around the X axis, the second coil 112 may be wound a plurality of times about the Y axis, and the third coil 113 may be wound Z And can be wound plural times around the axis. Accordingly, the three coils 111, 112 and 113 are arranged to be orthogonal to each other, so that the signal transmitted from the outside can be received in a stable state at all times regardless of the direction of the low frequency antenna module. The plurality of coils 111, 112, and 113 may be enameled wires that are enameled outside the copper wire having a predetermined wire diameter.

The magnetic core 120 and 220 are disposed inside three coils 111, 112 and 113 arranged orthogonally to each other to support a part or all of the three coils 111, 112 and 113.

The magnetic core 120 and 220 may include a first body 121 wound around the first coil 111 and a pair of second bodies 122 wound around the second coil 112, The pair of second bodies 122 may have a predetermined length in a direction parallel to the Y axis direction and may be integrally formed on both ends of the first body 121.

The first coil 111 is wound around the X axis a plurality of times around the surface of the first body 121 and the second coil 122 is wound around the Y axis to surround the pair of second bodies 122, The first coil 111 and the second coil 112 are arranged to be perpendicular to each other when the coil 112 is wound a plurality of times.

The first body 121 and the second body 122 may be formed to have the same height or thickness but the pair of second bodies 122 may have a thickness the first body 121 and the second body 122 may be formed to have a thickness t2 which is relatively thicker than the first body 121 and the first body 121, And may be integrally formed on the body 121.

The protruding thickness t21 of the second body 122 protruding from the upper surface and the lower surface of the first body 121 is larger than the protrusion thickness t21 of the first coil 121 wound on the first body 121 And may have the same thickness as the thickness.

The magnetic core 120 and the magnetic core 120 are disposed on the upper surface of the first body 121 and the protruding surfaces of the pair of second bodies 122 and the lower surface of the first body 121, The first and second coils 121a and 121b are formed by the protruding surfaces of the body 122 and receiving recesses 121a and 121b extending from the upper and lower surfaces of the second body 122 to a predetermined depth, It is possible to accommodate the thickness of the base 111.

However, the overall thickness t2 of the second body 122 is not limited thereto, and the total thickness t2 of the second body 122 may be determined from the upper surface and the lower surface of the first body 121 The protruding thickness t21 of the second body 122 protruding from the first body 121 may have a thickness that is relatively thicker than the entire thickness of the first coil 111 wound around the first body 121. [

The total thickness of the first coil 111 may be the same as the diameter of the first coil 111 or the first coil 111 may overlap the plurality of layers along the surface of the first body 121 And may be the entire thickness of the wound coil if it is to be coiled.

Sintered ferrites such as Mn-Zn, Ni-Zn, and Ni-Cu-Zn may be used for the magnetic core 120 and 220. However, the present invention is not limited thereto. A dust core may be used. Can be used as long as it is a material having a specific gravity. In addition, the magnetic core 120, 220 may be formed of a soft magnetic alloy having an amorphous or nanocrystal structure.

The plurality of wire guides 130 and 230 are for winding the third coil 113 around the Z axis so as to be vertically disposed with respect to the first coil 111 and the second coil 112, respectively.

For this purpose, the plurality of wire guides 130 and 230 may be spaced apart from each other at a predetermined interval along the rim of the magnetic core 120 or 220. For example, the plurality of wire guides 130 and 230 may be disposed on the four corners of the magnetic core 120 and 220 when the magnetic core 120 and 220 are provided in a substantially rectangular parallelepiped shape.

Accordingly, when the third coil 113 is wound around the Z axis to surround the plurality of wire guides 130 and 230, the first coil 111 and the second coil 112 wound around the magnetic core 120 and 220, Are orthogonal to each other.

Here, the plurality of wire guides 130 and 230 may be formed of an insulator.

At this time, the plurality of wire guides 130 and 230 may be formed with a coil placement groove 132 for receiving the thickness of the third coil 113 in an area where the third coil 113 is in contact with the third coil 113 .

In addition, the depth d of the coil placement groove 132 may be the same as the total thickness of the third coil 113.

As a result, the entire thickness of the third coil 113 is received by the coil placement groove 132, so that the third coil 113 does not protrude outward.

However, it should be noted that the depth d of the coil disposition groove 132 is not limited to this, and it may have a thickness that is relatively thicker than the entire thickness of the third coil 113.

The total thickness of the third coil 113 may be the diameter of the third coil 113 or the total thickness of the coil wound when the third coil 113 is wound so as to overlap the plurality of layers. .

The plurality of wire guides 130 and 230 may be formed to have the same height or thickness as the second body 122. The plurality of wire guides 130 and 230 may have a thickness the plurality of wire guides 130 and 230 may be formed to have a thickness t3 which is relatively thicker than the first body 122 and the second body 122, Respectively.

The protruding thickness t31 of the wire guides 130 and 230 protruding from the upper and lower surfaces of the second body 122 is larger than the protrusion thickness t31 of the second coil 122 wound around the second body 122, And may have the same thickness as the thickness.

The wire guides 130 and 230 are disposed on the upper surface of the second body 122 and the protruding surfaces of the wire guides 130 and 230 and the lower surface of the second body 122 and the protruding surfaces of the wire guides 130 and 230 Receiving grooves 122a and 122b are formed at a predetermined depth from the upper and lower surfaces of the wire guides 130 and 230 to accommodate the thickness of the second coil 112 wound on the second body 122 .

However, the total thickness t3 of the wire guides 130 and 230 is not limited thereto, and the total thickness t3 of the wire guides 130 and 230 may be set such that the entire thickness t3 of the wire guides 130 and 230 protrudes from the upper surface and the lower surface of the second body 121, The protruding thickness t31 of the wire guides 130 and 230 may be relatively thicker than the entire thickness of the second coil 112 wound on the second body 122. [

Here, the total thickness of the second coil 112 may be the diameter of the second coil 112, and the second coil 112 may include a plurality of layers (not shown) Lt; RTI ID = 0.0 > coiled < / RTI >

The plurality of wire guides 130 and 230 may include at least one terminal 142 for electrically connecting to the outside and at least one terminal 142 for connecting at least one end of the plurality of coils 111, And may include one wire binding aperture 144, and the terminal 142 and the wire binding aperture 144 may be electrically connected to each other.

For example, the terminals 142 may be formed on the bottom surface of the wire guides 130 and 230, and the wire binding holes 144 may be formed on the side surfaces of the wire guides 130 and 230, Two terminals 142 and two wire binding holes 144 are formed on the first and second terminals 130 and 230 and two terminals 142 and two wire binding holes 144 are matched one to one and electrically connected to each other.

At this time, the wire binding member 144 and the matching terminals 142 may be formed of a single member and may be connected to each other, but may be formed of one conductive member 140 having a predetermined area and length And Fig. 8).

Thus, when both ends of the plurality of coils 111, 112, and 113 are connected to the plurality of wire coupling members 144, both ends of the coils 111, 112, and 113 are electrically connected to the respective terminals 142.

For example, as shown in FIGS. 1 and 6, one of both ends of the first coil 111 is connected to a first wire binding member (not shown) formed in the first wire guides 130a and 230a of the plurality of wire guides 144a and the other end may be connected to a fifth wire coupling 144e formed on the third wire guides 130c, 230c arranged in a diagonal direction with the first wire guides 130a, 230a.

One of both ends of the second coil 112 may be connected to a second wire binding hole 144b formed in the first wire guides 130a and 230a and the other end may be connected to the first wire guide 130a And a fourth wire binding hole 144g formed in the fourth wire guides 130d and 230d spaced apart from each other along the Y axis direction.

In addition, any one of the opposite ends of the third coil 113 is connected to the fourth wire bonds 130b and 230b formed on the second wire guides 130b and 230b spaced apart from the first wire guides 130a and 230a along the X- And the other end may be connected to an eighth wire binding aperture 144h formed in the fourth wire guides 130d and 230d.

However, it should be understood that the positions of the wire binding apertures 144 connected to both ends of the plurality of coils 111, 112, and 113 are not limited thereto and may be variously changed according to design conditions.

At least one mark 134 may be formed on one of the plurality of wire guides 130 and 230 to indicate a reference position. Here, the reference position may be a position of the terminal 142a directly connected to the first wire binding member 144a among the plurality of terminals.

For example, the mark portion 134 may have a shape of a receiving groove having a predetermined depth on the upper surface of the first wire guide 130a or 230a on which the terminal 142a connected to the first wire binding hole 144a is formed. As shown in FIG.

However, it should be noted that the mark portion 134 is not limited thereto, and any shape can be used as long as the mark can be easily recognized by the operator, such as a leader line, a color, and a figure.

As described above, the low-frequency antenna modules 100 and 200 according to the present invention are configured such that the opposite ends of the coils 111, 112, and 113 are individually connected to the plurality of wire binding members 144, When a circuit board (not shown) is disposed on the lower surface side of the circuit board, which is electrically connected to the circuit board 142, and terminals 142 formed on the plurality of wire guides 130 and 230 are mounted on the circuit board, A plurality of coils 111, 112 and 113 are electrically connected to each other through a terminal 142 and a wire binding hole 144 so that power supplied from the outside can be supplied to the respective coils 111, 112 and 113 through the circuit board.

That is, the plurality of wire guides 130 and 230 applied to the low-frequency antenna modules 100 and 200 according to the present invention support the third coil 113 wound around the Z axis, A plurality of coils 111, 112, and 113 for electrically connecting the coils 111, 112, and 113 to the outside through the terminals 142 and the wire binding holes 144 by insulating the remaining portions except the electrically connected terminals 142 and the wire binding holes 144 Terminal can be performed simultaneously.

Therefore, a separate structure for energizing the plurality of coils 111, 112, and 113 and the circuit board is not required. Therefore, the entire structure is simple, and the first coil 111, the second coil 112, 113 can be accommodated and the size corresponding to the thickness of each coil can be reduced.

Here, connection terminals (not shown) corresponding to the plurality of terminals 142 may be formed on one surface of the circuit board. The plurality of terminals 142 and the wire binding holes 144 may be provided in the plurality of wire guides 130 and 230 or may be selectively provided only in a part of the plurality of wire guides 130 and 230, It is noted that the number of the terminals 142 and the wire binding apertures 144 formed in the wire guides 130 and 230 may have the same number or different numbers. However, the total number of the terminals 142 and the wire binding holes 144 formed in the plurality of wire guides 130 and 230 may be six or more so that both ends of the three coils 111, 112, and 113, If it is, let it be known.

Meanwhile, the conductive member 140 may be integrated with the wire guide 144 through an insert molding.

One end of the conductive member 140 is exposed at the bottom of the wire guides 130 and 230 to form the terminal 142 and the other end of the conductive member 140 is exposed at the side surfaces of the wire guides 130 and 230, The wire 142 may be integrated with the wire guides 130 and 230 to form the hole 144 so that the remaining portion except for the terminal 142 and the wire binding hole 144 may be embedded therein. Here, the wire binding member 144 may protrude outward from the side surface of the wire guides 130 and 230 by a predetermined length so as to easily connect the ends of the coils 111, 112, and 113.

The conductive member 140 may be insulated from the surface of the conductive member 140 by being embedded in wire guides 130 and 230 made of an insulator except for the terminal 142 for energizing and the wire binding hole 144.

In the low frequency antenna module 100 or 200 according to the present invention, a plurality of wire guides 130 and 230 may be coupled in a horizontal direction (parallel to the XY plane) with respect to the magnetic core 120 and 220, 120, 220, and may be removably coupled.

In one embodiment, the plurality of wire guides 130 may have a shape in which a part of the magnetic core 120 is inserted into the coupling groove 136 by inserting the coupling groove 136 having a predetermined area into one side, (See Figs. 2 to 5).

Here, a part of the magnetic core 120 inserted into the coupling groove 136 may be the edge side of the magnetic core 120.

To this end, the magnetic core 120 may be provided with a protrusion 123 corresponding to the coupling groove 136 on the corner side.

For example, the first body 121 may have a relatively longer length than the pair of second bodies 122, and the pair of second bodies 122 may be formed on the first body 121 And is formed integrally with the first body 121 so that the side surfaces of the second body 122 adjacent to both ends of the second body 122 and the side surfaces of the first body 121, A predetermined space defined in the side surface may be formed, and the protruding pieces 123 may be respectively disposed in the predetermined space. At this time, the protruding pieces 123 may be provided in a plate-like shape having a predetermined area and thickness so as to be parallel to the plane defined by the X-axis and the Y-axis.

The protrusion pieces 123 are moved in the direction perpendicular to the magnetic core 120 so that the protrusions 123 are engaged with the engaging grooves 136 formed in the wire guide 130, The wire guide 130 can be easily coupled to the magnetic core 120. [

The protruding piece 123 may be formed integrally with a side surface of the first body 121 defining the predetermined space and a side surface of the second body 122. However, And the side surfaces of the first body 121 and the second body 122, respectively.

At this time, the projecting piece 123 is formed to have a thickness t4 which is thinner than the thickness t1 of the first body 121 having a thickness that is relatively thinner than the thickness t2 of the second body 122 . The upper surface of the protruded piece 123 is formed at a relatively lower position than the upper surface of the first body 121 and the lower surface of the protruded piece 123 is formed at a lower portion of the first body 121 It can be formed at a relatively higher position than the face.

Therefore, the upper surface and the lower surface of the protruding piece 123 are formed in a step structure with respect to the upper surface and the lower surface of the first body 121 and the upper surface and the lower surface of the second body 122, By limiting the insertion depth of the wire guide 130 in the course of coupling the wire guide 130, the wire guide 130 can be inserted into the upper and lower surfaces of the first body 121, or the upper surface of the second body 122 Thereby preventing the lower surface from being covered.

The winding area of the first coil 111 wound on the first body 121 or the winding area of the second coil 112 wound to surround the second body 122 is smaller than the initial design area .

At this time, an adhesive member (not shown) is disposed on the contact surfaces of the protruding pieces 123 and the coupling grooves 136 that are mutually coupled to each other so that the protruding pieces 123 and the coupling grooves 136 are interposed between the wire guides 130 Can be prevented from being separated from the magnetic core 120.

That is, when the protruding piece 123 is inserted into the coupling groove 136, the wire guide 130 is moved up and down (Z-axis) of the magnetic core 120 perpendicular to the coupling direction by the protruding piece 123, Flow is generated in the horizontal direction parallel to the fastening direction (direction parallel to the XY plane), and the engagement state of the engagement groove 136 and the protruding piece 123 can be released. In the present embodiment, by disposing an adhesive member (not shown) on the contact surfaces of the projecting piece 123 and the engagement groove 136, it is possible to prevent the engagement state of the engagement groove 136 and the projecting piece 123 from being released have.

As another example, the plurality of wire guides 230 may include at least one coupling hole 232 having a predetermined length along the height direction (Z-axis direction) of the wire guide 230 and protruding outwardly And insertion grooves 223a and 223b are formed on the magnetic core 220 side along the height direction (Z-axis direction) from one side so that the coupling holes 232 are inserted into the insertion grooves 223a and 223b (See Figs. 7 to 12).

Here, the insertion grooves 223a and 223b may be formed on the edge side of the magnetic core 220.

At this time, the coupling ports 232 may be provided as a pair, or may be provided as a pair of spaced apart from each other with a predetermined distance along the height direction (Z-axis direction) of the wire guide 230. In this case, the insertion grooves 223a and 223b are also formed as a pair which is drawn in the height direction (Z-axis direction) from the upper surface and the lower surface of the magnetic core 220, (In a direction parallel to the XY plane) on the side of the pair of insertion grooves 223a and 223b so that they can be inserted.

The engaging pieces 224 having a predetermined area and thickness are formed between the pair of insertion grooves 223a and 223b arranged up and down along the height direction (Z-axis direction) of the magnetic core 220 When one pair of coupling holes 232 are inserted into the pair of insertion grooves 223a and 223b, one end side of the pair of coupling holes 232 is connected to the upper portion of the coupling piece 224 And may be arranged to be in contact with the surface and the lower surface, respectively.

The pair of engagement holes 232 inserted into the pair of insertion grooves 223a and 223b are in contact with the upper surface and the lower surface of the engagement piece 224 so that the engagement pieces 224 (Z-axis direction) perpendicular to the upper and lower surfaces of the upper and lower surfaces.

Therefore, even if a separate adhesive member is not used, the position of the coupling hole 232 inserted into the insertion grooves 223a and 223b is fixed and the movement in the upward and downward directions (Z-axis direction) is restricted, Even when the low frequency antenna module 200 is turned over or shaken during a work process or a transportation process, the wire guide 230 can be held in a predetermined position.

In this embodiment, in order to smoothly insert the coupling member 232 into the insertion grooves 223a and 223b in a direction parallel to the horizontal direction (direction parallel to the XY plane) of the magnetic core 220, So as to be elastically deformable.

For example, the insertion grooves 223a and 223b may have a cross-sectional shape including a first circular arc portion 223c exceeding an area of a semicircle, And a pair of elastic pieces 232a and 232b having a sectional shape including the second circular arc portion 232c. At this time, the pair of elastic pieces 232a and 232b are spaced apart from each other by a predetermined distance so as to face each other except for the second circular arc part 232c.

Accordingly, when the end portions of the pair of elastic pieces 232a and 232b are pushed into the insertion grooves 223a and 223b, an external force is applied to the elastic piece side due to the contact, The interval between the first and second contact portions 232a and 232b becomes narrow. Accordingly, the pair of elastic pieces can be inserted into the insertion grooves 223a and 223b through the open portions of the insertion grooves 223a and 223b. When the external force applied to the pair of elastic pieces 232a and 232b is removed, the pair of elastic pieces 232a and 232b return to the original position, and the first arc part 223a and 223b of the insertion groove 223a and 223b 223c, the pair of elastic pieces 232a, 232b can be prevented from being detached to the outside of the insertion grooves 223a, 223b (see FIG. 11).

Conversely, when a pair of elastic pieces 232a and 232b inserted into the insertion grooves 223a and 223b are to be separated, if the pair of elastic pieces 232a and 232b are pulled out, An external force is generated by the contact of the elastic pieces 232a and 232b and the space between the pair of elastic pieces 232a and 232b facing each other is narrowed so that the elastic pieces 232a and 232b are separated from the insertion grooves 223a and 223b through the open portions of the insertion grooves 223a and 223b The pair of elastic pieces 232a and 232b can be easily detached (see Fig. 11).

As a result, each wire guide 230 can be fastened to or separated from the magnetic core 220, so that the wire guide 230 can be easily separated when the wire guide 230 needs to be replaced.

The first circular arc portion 223c and the second circular arc portion 232c are formed to have the same radius so that when the pair of elastic pieces 232a and 232b are inserted into the insertion grooves 223a and 223b The outer surface of the first circular arc portion 223c included in the elastic pieces 232a and 232b and the inner surfaces of the insertion grooves 223a and 223b corresponding to the second circular arc portion 232c are brought into contact with each other, .

Meanwhile, the low-frequency antenna modules 100 and 200 according to the present invention may include a separate protection member (not shown) for preventing the plurality of coils 111, 112 and 113 from being exposed to the outside on at least one side.

Such a protective member may be provided in the form of a flexible protective film or may be made of a rigid material.

The protection member may be formed on one surface of the low frequency antenna module 100 or 200, for example, covering only the upper surface, or may have a portion other than the terminal 142 formed on the lower surface of the wire guide 130 or 230, Or may be formed to cover both the upper surface and the side surface.

The low frequency antenna modules 100 and 200 according to the present invention can be applied to a keyless entry system including a low frequency transmitter and a low frequency receiver (refer to FIG. 13).

For example, the low-frequency antenna modules 100 and 200 may be installed in a smart phone 10, a portable terminal such as a smart phone, or a key fob built in a wearable device such as a smart watch.

Here, the KEY FOB may include a low frequency (LF) receiver including a low frequency antenna module 100, 200, a 3D active immobilizer, and a microcontroller.

Accordingly, low frequency (LF) communication in the 22 kHz band is performed between the key fob mounted on the smart key 10 and the control unit mounted on the vehicle, for example, to wirelessly open the door or steering of the vehicle, At least one of the lock or unlock can be controlled.

In addition, the low-frequency antenna modules 100 and 200 described above can be used as a keyless start system in which a driver can start a vehicle, operate and stop the engine while being electronically authenticated without inserting or manipulating a separate mechanical key, As shown in FIG.

It is also noted that the low-frequency antenna modules 100 and 200 may be implemented as a low-frequency transmitter constituting a keyless entry system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 200: low frequency antenna module 111: first coil
112: second coil 113: third coil
120, 220: magnetic core 121: first body
121a, 121b: receiving groove 122: second body
122a, 122b: receiving groove 123:
130, 230: wire guide 132: coil placement groove
134: mark portion 136: engaging groove
232c: second arc portion 140: conductive member
142: Terminal 144:

Claims (23)

A low-frequency antenna module in which a plurality of coils are wound around an X-axis, a Y-axis, and a Z-axis orthogonal to each other,
A magnetic core in which a first coil is wound around the X-axis and a second coil is wound around the Y-axis; And
At least one terminal for electrical connection to the outside and at least one wire binding port for connecting any one of the two ends of the coil is coupled in a horizontal direction with respect to the magnetic core, And a plurality of wire guides spaced apart along the rim of the magnetic core so that the third coil can be wound. The method according to claim 1,
Wherein the magnetic core includes a first body on which the first coil is wound and a pair of second bodies formed integrally with the first body and on which the second coil is wound,
Wherein the pair of second bodies are formed to protrude at a predetermined height from the upper surface and the lower surface of the first body, respectively. 3. The method of claim 2,
The protruding thickness of the second body protruding from the upper surface and the lower surface of the first body is equal to the thickness of the first coil or is formed to have a thickness relatively thicker than the thickness of the first coil, module. 3. The method of claim 2,
Wherein the wire guide has a thickness that is relatively thicker than a thickness of the second body so that the wire guide protrudes from the upper surface and the lower surface of the second body at a predetermined height when the magnetic body is coupled with the magnetic core. 5. The method of claim 4,
Wherein the protruding thickness of the wire guide protruding from the upper surface and the lower surface of the second body is equal to the thickness of the second coil or is formed to have a thickness relatively thicker than the thickness of the second coil, . The method according to claim 1,
And a coil arrangement groove for receiving the third coil is drawn inwardly in an area where the plurality of wire guides are in contact with the third coil. The method according to claim 6,
Wherein a depth of the coil arrangement groove is formed to have the same size as the thickness of the third coil or to have a size larger than a thickness of the third coil. The method according to claim 1,
Wherein the wire binding port is provided to be matched one-to-one with the terminals and energized. 9. The method of claim 8,
Wherein the terminal and the wire binding section, which are electrically connected to each other, are formed of one conductive member. 10. The method of claim 9,
Wherein the conductive member is partially exposed on a bottom surface of the wire guide to form the terminal and is partially exposed on a side surface of the wire guide to be integrated with the wire guide through an insert molding to form the wire binding aperture. The method according to claim 1,
Wherein the wire guide has an engagement groove formed therein for receiving a portion of the magnetic core, and the wire guide is coupled to the magnetic core via the engagement groove. 12. The method of claim 11,
And a part of the magnetic core inserted into the coupling groove is the corner side of the magnetic core. 12. The method of claim 11,
And a bonding member is provided on a contact surface between the coupling groove and the magnetic core to prevent the wire guide from being separated from the magnetic core. The method according to claim 1,
The wire guide includes at least one coupling hole having a predetermined length along a height direction and protruding outwardly. The coupling hole includes a low frequency antenna inserted into an insertion groove formed in a height direction from one surface of the magnetic core, module. 15. The method of claim 14,
Wherein the coupling grooves are provided in a pair spaced apart from each other at a predetermined interval along a height direction of the wire guide, and the insertion grooves are formed in a pair of grooves extending in a height direction from an upper surface and a lower surface of the magnetic core A low-frequency antenna module; 15. The method of claim 14,
Wherein the coupling hole is elastically deformable by an external force. 17. The method of claim 16,
Wherein the insertion groove has a cross-sectional shape including a first arc portion exceeding an area of a semicircle and is formed so as to open at one side thereof, and the coupling hole has a cross-sectional shape including a second arc portion smaller than a semicircular area, And a pair of elastic pieces arranged to be arranged. The method according to claim 1,
Wherein a mark portion for indicating a reference position is provided in any one of the plurality of wire guides. The method according to claim 1,
Wherein the plurality of wire guides are made of an insulator. A smart key with a low-frequency antenna module according to any one of claims 1 to 19. A portable terminal incorporating the low-frequency antenna module according to any one of claims 1 to 19. A wearable device incorporating the low-frequency antenna module according to any one of claims 1 to 19. receiving set; And a transmitter, the keyless entry system comprising:
A low-frequency antenna module according to any one of claims 1 to 19, wherein the low-frequency antenna module is embedded in the receiver.

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