KR20170120472A - 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. The low-frequency antenna module according to the 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, A first coil wound around the X axis; and a second coil wound around the Y axis, the low-frequency antenna module comprising: And a plurality of wire guides spaced apart along the rim of the magnetic core so as to support a third coil wound around the Z axis and integrally formed with the magnetic core.

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 comprising: a first coil wound around the X-axis; and a second coil wound around the X-axis, A magnetic core for supporting a second coil wound around a Y axis; And a plurality of wire guides spaced along the rim of the magnetic core so as to support a third coil wound around the Z axis and integrally formed with the magnetic core.

In addition, the wire guide may include at least one terminal for electrical connection with the outside, and at least one wire binding port for connecting any one of the ends of the 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 be formed with at least one placement hole formed at a position corresponding to the terminal at the time of insert molding, passing through the wire guide in a height direction.

In addition, the wire guide may be formed with a coil placement groove for receiving the thickness of the third coil inwardly on a side contacting 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 guide may be formed as a stepped surface on a side where the third coil is disposed.

The magnetic core may include a main body for supporting the first coil, and a plurality of protrusions protruding from the upper and lower surfaces of the main body at predetermined heights, respectively, to support the second coil.

The protrusion may be formed to have a thickness equal to the thickness of the first coil or to have a thickness that is relatively thicker than the thickness of the first coil.

The wire guide may have a relatively thicker thickness than the sum of the thicknesses of the pair of protrusions formed on the upper surface and the lower surface of the main body and the main body so as to protrude at a predetermined height from one surface of the protrusion .

The protrusion thickness of the wire guide protruding from one surface of the protrusion 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 wire guide may be formed with an engaging groove formed at a predetermined depth inward, and a portion of the magnetic core may contact the inner surface of the engaging groove.

The magnetic core may include a plurality of insertion grooves formed at a predetermined depth from at least one of an upper surface and a lower surface of the magnetic core, and the wire guide may be provided at a position corresponding to the insertion groove, And the wire guide can prevent the protrusion from being separated from the magnetic core by being disposed in the insertion groove.

Further, the protrusions are provided in a pair spaced apart from each other with a predetermined interval along the Z-axis direction, and a pair of protrusions are formed in a pair of insertion grooves formed respectively on the upper surface and the lower surface of the magnetic core .

At least one filler hole is formed in the magnetic core corresponding to the coupling groove in the height direction. The filler hole may be formed by resin material constituting the wire guide at the time of insert molding of the wire guide and the magnetic material core, Can be filled.

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

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 a plurality of wire guides are forcibly separated from a magnetic core in FIG. 2;
FIG. 5 is a view showing a part of a plurality of wire guides cut in order to show a coupling relation between the wire guide and the magnetic core in FIG. 2;
FIG. 6A is a cross-sectional view taken along line AA in FIG. 2,
FIG. 6B is a cross-sectional view taken along line BB in FIG. 2,
Fig. 6C is a sectional view in the CC direction of Fig. 2,
FIG. 7 is a schematic view illustrating a low-frequency antenna module according to another embodiment of the present invention;
8 is a view showing a state in which a plurality of coils are removed in FIG. 7,
Fig. 9 is a bottom view of Fig. 7,
FIG. 10 is a view showing a state in which a plurality of wire guides are forcibly separated from a magnetic core in FIG. 7;
FIG. 11 is a view showing a part of a plurality of wire guides cut in the longitudinal direction in order to show a coupling relation between the wire guide and the magnetic core in FIG. 7,
FIG. 12 is a cross-sectional view of a portion of a plurality of wire guides for illustrating the coupling relationship between the wire guide and the magnetic core in FIG. 7;
Fig. 13A is a sectional view taken along the line aa in Fig. 7,
Fig. 13B is a cross-sectional view taken along the line bb in Fig. 7,
Fig. 13C is a cross-sectional view taken along line cc in Fig. 7,
FIG. 14 is a flowchart schematically illustrating a process of integrating a magnetic core and a wire guide through insert molding in a low frequency antenna module according to another embodiment of the present invention, and FIG.
15 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.

The low frequency antenna module 100 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 as shown in FIGS.

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. However, it should be noted that the material of the coil is not limited thereto, and any material can be used as long as the conductive material is covered with an insulating layer.

The magnetic core 120, 220 is disposed inside three coils 111, 112, 113 arranged orthogonally to each other to support a part or all of the three coils 111, 112, 113 so that three coils can be maintained in an orthogonal state.

The magnetic core 120 and 220 may include a main body 121 through which the first coil 111 is wound and a plurality of protrusions 122 through which the second coil 112 is wound. The plurality of protrusions 122 may have a predetermined length in a direction parallel to the Y-axis direction and may be integrally formed on the upper surface and the lower surface of the main body 121, May be formed on the surface and the lower surface, respectively.

At this time, the plurality of protrusions 122 may be spaced apart from each other along the X-axis direction on the edge of the main body 121, and may be formed on only one of the upper surface and the lower surface of the main body 121 And may be formed to be symmetrical with respect to the upper surface and the lower surface of the main body 121, respectively.

The first coil 111 is wound around the X axis along the surface of the main body 121 a plurality of times and the second coil 112 is wound around the Y axis to surround the plurality of protrusions 122 The first coil 111 and the second coil 112 are arranged to be orthogonal to each other.

The plurality of protrusions 122 protruding at a predetermined height from at least one surface of the upper surface and the lower surface of the main body 121 may have a thickness t2 smaller than the thickness t2 of the first coil 111 wound on the main body 121 And may have the same thickness as the whole thickness (see Fig. 6A).

The magnetic core 120 and the magnetic core 120 are inserted into the housing 122 at a predetermined depth from one surface of the protrusion 122 by one surface of at least one of the upper surface and the lower surface of the main body 121 and the side surface of the protrusion 122, The thickness of the first coil 111 wound on the main body 121 can be accommodated by forming the first and second coils 121a and 121b.

The thickness t2 of the protrusion 122 protruding from the upper surface and the lower surface of the main body 121 is not limited to the thickness t2 of the protrusion 122, It is also possible to have a thickness relatively thicker than the entire thickness of the first coil 111 wound.

The total thickness of the first coil 111 may be the same as the diameter of the first coil 111. The first coil 111 may be wound in a plurality of layers along the surface of the main body 121, The total thickness of the wound coil.

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.

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, Respectively.

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

The plurality of wire guides 130 and 230 may be provided with a receiving portion for receiving a part or the whole thickness of the third coil 113.

For example, the plurality of wire guides 130 may have a coil placement groove 132 formed therein to receive the thickness of the third coil 113 in an area where the third coil 113 is in contact with the third coil 113 have. At this time, the depth d of the coil placement groove 132 may be the same as the total thickness of the third coil 113 (see FIG. 6A). Accordingly, the entire thickness of the third coil 113 is received by the coil placement groove 132, so that the third coil 113 may 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.

As another example, the plurality of wire guides 230 may be formed as a stepped surface on the side where the third coil 113 is disposed. That is, the plurality of wire guides 230 are formed such that a part of the total area 232a of the side surface on which the third coil 113 is disposed and the remaining area 232b excluding the part of the area 232a are smaller than the area 232a may be formed as a stepped surface having a height difference h with respect to the first area 232a and the remaining area 232b may protrude outward with respect to the second area 232a. At this time, the height difference h of the stepped surface may have the same size as the entire thickness of the third coil 113 (refer to FIG. 13). Accordingly, when the first coil 113 is directly wound on the area 232a, the thickness of the third coil 113 is received through the space defined by the stepped surface, 113 may not protrude outward. In addition, a side surface of the wire guide 230 on which the third coil 113 is disposed is formed as a stepped surface having a predetermined height difference h, and the partial area 232a along the Z- It is possible to easily separate the wire guide 230 and the magnetic core 220 from each other through a process of integrating the wire guide 230 and the magnetic core 220 through insert molding, thereby improving work productivity.

Here, the height difference h of the stepped surface is not limited to the same thickness as the entire thickness of the third coil 113, but may be relatively thicker than the entire thickness of the third coil 113 . The total thickness of the third coil 113 may be the same as the diameter of the third coil 113. 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 as a total of a sum of the thickness t2 of the protrusion 122 formed on at least one of the upper and lower surfaces of the main body 121 and the thickness t1 of the main body 121, The thickness t2 of the protrusion 122 formed on at least one of the upper and lower surfaces of the main body 121 and the thickness t2 of the main body 121 may be different from each other. (See Fig. 6A and Fig. 13A), which is relatively thicker than the total thickness t1 +

The upper and lower surfaces of the plurality of wire guides 130 and 230 may have protrusions 122 formed on one surface of a protrusion 122 formed on an upper surface of the main body 121 and a lower surface of the main body 121, Axis direction from the one surface of the substrate W.

The protrusion thickness t31 of the wire guide 130 protruding from one surface of the protrusion 122 may have the same thickness as the total thickness of the second coil 112 wound on the protrusion 122 (See Figs. 6C and 13C).

The wire guides 130 and 230 are formed on one surface of a pair of protrusions 122 formed on the upper surface of the main body 121 and on the protruding surface of the wire guides 130 and 230, Receiving grooves 122a and 122b are formed at a predetermined depth from the upper surface and the lower surface of the wire guides 130 and 230 by the one surface of the pair of protrusions 122 and the protruding surfaces of the wire guides 130 and 230, The thickness of the second coil 112 wound to surround the plurality of projections 122 can be accommodated.

The total thickness t3 of the wire guides 130 and 230 is not limited to the total thickness t3 of the wire guides 130 and 230. The total thickness t3 of the wire guides 130 and 230 may be adjusted by the wire guides 130 and 230 protruding from one surface of the protrusion 121, The protruding thickness t31 of the first coil 112 may have a thickness that is relatively thicker than the entire thickness of the second coil 112 wound around the plurality of protrusions 122. [

Here, the total thickness of the second coil 112 may be the same as the diameter of the second coil 112, and the second coil 112 may overlap the plurality of the protrusions 122 But may be the entire thickness of the coiled coil if it is coiled.

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 terminal 142 may be formed on the bottom surface of the wire guide 130, and the wire binding member 144 may be formed on a side surface of the wire guide 130, Two terminals 142 and two wire binding members 144 are formed on the base 130 and the two terminals 142 and the two wire binding members 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 , Fig. 6C, Fig. 9 and Fig. 13C).

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 7, any one of both ends of the first coil 111 may be connected to a first wire binding port (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.

Here, the third wire binding member 144c and the sixth wire binding member 144f, which are not connected to both ends of the coil, may serve as a ground, and when coupled to the circuit board, And may be in the form of being electrically connected to the wire binding means.

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 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 is formed in the form of a receiving groove having a predetermined depth on the upper surface of the first wire guide 130a on which the terminal 142a connected to the first wire binding hole 144a is formed. .

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. In addition, the figure shows that the mark portion 134 is applied to the embodiment of Figs. 1 to 6, but it is not limited thereto, and it is also applicable to the embodiment of Figs. 7 to 14. [

The low frequency antenna modules 100 and 200 have the terminals 142 connected to the ends of the coils 111, 112 and 113 respectively and connected to the plurality of wire binding members 144, A circuit board (not shown) is disposed on the lower surface side of the low frequency antenna modules 100 and 200 so that the terminals 142 formed on the plurality of wire guides 130 and 230 are electrically connected to the circuit board A power supply provided from the outside through the terminal 142 and the wire coupling 144 electrically connected to the circuit board and the plurality of coils 111, 112 and 113 is supplied to the 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 guides 130 and 230 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.

14, the wire guide 230 according to the present invention is formed by inserting the conductive member 140 and the wire guide 230 in the process of integrating the conductive member 140 and the wire guide 230 through the insert molding, The movable member 140 can be prevented from moving.

That is, the support pin 20 is fixed to the terminal 142 so that the terminal 142 of the conductive member 140 is positioned on the bottom surface of the wire guide 230 during insert molding, So that it can be exposed to the outside from the bottom surface of the wire guide 230 without being buried in the wire guide 230.

7 to 9, when the support pins 20 are removed after the insert molding is completed, the support pins 20 are removed from the positions corresponding to the terminals 142 along the height direction of the wire guide 230 The placement hole 239 can be formed through the through hole.

Although the arrangement hole 239 is shown in the embodiment shown in FIGS. 7 to 14, the present invention is not limited thereto. The present invention can be applied to the embodiments of FIGS. 1 to 6, It is possible to apply the present invention to any one of them.

Meanwhile, in the low frequency antenna module 100 and 200 according to the present invention, a plurality of wire guides 130 and 230 may be formed integrally with the magnetic core 120 and 220.

For example, the plurality of wire guides 130 and 230 may be integrated with the magnetic core 120 and 220 through insert molding.

That is, the plurality of wire guides 130 and 230 are coupled with a predetermined area by the magnetic core 120 and 220 in the course of forming the wire guides 130 and 230 to be integrated with a part of the magnetic core 120 and 220 through the insert molding. Grooves 136 and 236 may be formed inwardly. Accordingly, a part of the magnetic core 120, 220 may be integrated into the coupling grooves 136, 236 so as to be in contact with the inner surfaces of the coupling grooves 136, 236 (see FIGS. 4 and 10).

Here, a part of the magnetic core 120, 200 contacting the inner surface of the coupling groove 136, 236 may be the edge side of the magnetic core 120, 220.

The low frequency antenna module 100 or 200 according to the present invention includes constraining means for preventing the plurality of wire guides 130 and 230 integrated with the magnetic core 120 and 220 from being separated from the magnetic core 120 and 220 through the insert molding .

For example, at least one surface of the upper and lower surfaces of the magnetic core 120 may have a plurality of insertion grooves 123 formed therein at a predetermined depth from the exposed surface (see FIG. 4). In other words, the plurality of insertion grooves 123 may be formed at a predetermined depth inwardly to have a predetermined area from the upper surface and the lower surface of the main body 121, . The resin material constituting the wire guide 130 is inserted into the insertion groove 123 in the process of integrally forming the respective wire guides 130 on the four corners of the magnetic core 120 through the insert molding. As shown in Fig. The resin material filled in the insertion groove 123 is hardened so that the wire guide 130 extends in the Z axis direction from the inner surface of the coupling groove 136 at a position corresponding to the insertion groove 123 When the insertion groove 123 is formed on the upper surface and the lower surface of the main body 121 respectively, the ridge portion 138 may be formed on the upper side inner surface (See FIG. 6C) extending along the Z-axis direction from the inner surface of the lower side and spaced apart at a predetermined interval along the Z-axis direction. A plurality of wire guides 130 are integrated with the magnetic core 120 in such a manner that the protrusions 138 are inserted into the insertion grooves 123 and the wire guides 130 are inserted into the protrusions 138, Can be prevented from being separated from the magnetic core 120 by being restrained by a part of the rim defining the insertion groove 123. [

In another embodiment, at least one charging hole 224 may be formed through the magnetic core 220 along the Z-axis direction (see FIGS. 10 and 14). That is, the charging holes 224 may be formed on the edge sides of the magnetic core 220, respectively. Accordingly, in the process of integrally forming the respective wire guides 230 on the four corners of the magnetic core 220 through the insert molding, the resin material constituting the wire guides 230 is filled with the filler 224, The wire guide 230 may be formed with a connecting portion 237 which connects the inner surfaces of the wire guide 230 facing each other along the Z axis direction to the coupling groove 236 side. Accordingly, each of the wire guides 230 can be prevented from being separated from the magnetic core 220 by being restrained by the connecting portion 237.

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 (see FIG. 15).

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 the low frequency antenna modules 100 and 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:
121a, 121b: receiving groove 122:
122a, 122b: receiving groove 123: insertion groove
224: Charging Vacuum 130,230: Wire Guide
132: coil placement grooves 232a, 232b:
134: mark portion 136, 236: engaging groove
138: ridge 239:
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 supporting a first coil wound around the X axis and a second coil wound around the Y axis; And
And a plurality of wire guides spaced apart along the rim of the magnetic core so as to support a third coil wound about the Z axis and integrally formed with the magnetic core. The method according to claim 1,
Wherein the wire guide comprises at least one terminal for electrical connection to the outside and at least one wire binding port for connecting any one of the ends of the coil. 3. The method of claim 2,
Wherein the wire binding port is provided to be matched one-to-one with the terminals and energized. The method of claim 3,
Wherein the terminal and the wire binding section, which are electrically connected to each other, are formed of one conductive member. 5. The method of claim 4,
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. 6. The method of claim 5,
Wherein the wire guide is formed with at least one placement hole that is formed to pass through the wire guide in a height direction at a position corresponding to the terminal upon insert molding. The method according to claim 1,
Wherein the wire guide has a coil placement groove formed inwardly to receive a thickness of the third coil on a side contacting with the third coil. 8. The method of claim 7,
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 guide is formed as a stepped surface at a side contacting with the third coil. The method according to claim 1,
Wherein the magnetic core includes a body for supporting the first coil and a plurality of protrusions protruding from the upper and lower surfaces of the body at predetermined heights to support the second coil. 11. The method of claim 10,
Wherein the protrusion is formed to have the same thickness as the thickness of the first coil or to have a thickness that is relatively thicker than the thickness of the first coil. 11. The method of claim 10,
Wherein the wire guide has a relatively thicker thickness than a sum of the thicknesses of the pair of protrusions formed on the upper surface and the lower surface of the main body and the lower surface of the main body so as to protrude from the one surface of the protrusion, module. 13. The method of claim 12,
Wherein a protrusion thickness of the wire guide protruding from one surface of the protrusion is formed to have the same thickness as the thickness of the second coil or to have a relatively thick thickness than the thickness of the second coil. The method according to claim 1,
Wherein the wire guide is formed with an engaging groove formed at a predetermined depth inward and a part of the magnetic core is disposed in the engaging groove so as to be in contact with the inner surface of the engaging groove. 15. The method of claim 14,
Wherein the magnetic core has a plurality of insertion grooves formed at a predetermined depth from at least one surface of the upper surface and the lower surface,
The wire guide includes at least one ridge extending from the inner surface of the coupling groove along the Z-axis direction at a position corresponding to the insertion groove,
Wherein the wire guide prevents the protrusions from being separated from the magnetic core by being disposed in the insertion groove. 16. The method of claim 15,
The protrusions are disposed in a pair spaced apart from each other at a predetermined interval along the Z axis direction and the pair of protrusions are respectively disposed in a pair of insertion grooves formed on the upper surface and the lower surface of the magnetic core Low frequency antenna module. 15. The method of claim 14,
Wherein at least one filling hole is formed in a region of the magnetic core corresponding to the coupling groove along a height direction and the filling hole is filled with a resin material constituting the wire guide at the time of insert molding of the wire guide and the magnetic core Low frequency antenna module. 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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