KR102012352B1 - Low Frequency Antenna Module 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 includes a magnetic core having a protrusion formed to protrude in one direction from a plate-shaped core body having a predetermined area; A coil wound along a circumference of the protrusion; A magnetic sheet having an insertion hole formed in a region corresponding to the protrusion and having an end portion of the protrusion coupled to the insertion hole to cover one surface of the coil; And a base member having at least two connection terminals to which both ends of the coil are connected.

Description

Low frequency antenna module and keyless entry system including the same

The present invention relates to a low frequency antenna module and a keyless entry system including the same. A low frequency antenna module and a keyless entry system including the same can be applied to a keyless entry system for wirelessly manipulating locking or opening a door of an automobile. It is about.

In the keyless entry system, the door lock is released even if the driver does not operate the key or the remote controller separately. That is, when the driver holds the key and the key and the electronic authentication device inside the vehicle are authenticated with each other, the door is automatically unlocked.

An antenna module for implementing such a keyless entry system is generally configured in the form of a coil wound around a rod-shaped ferrite core, and a plurality of antenna modules are mounted at a predetermined position.

Such an antenna module is a method of implementing an Z-axis antenna module by winding a coil on a bar-shaped magnetic core to form an antenna module for X and Y axes, and winding a coil on a side of a hexahedron formed of a magnetic core.

Among these, the Z-axis antenna module improves the characteristics of the coil by arranging the coil by processing a groove on the side of the cube.

However, there is a problem that the permeability is changed due to the occurrence of cracks or breakage in the process of processing the grooves on the side of the cube, so that the initial design value is not satisfied. In addition, there is a problem that productivity is lowered because a separate processing process is required.

KR 10-2010-0079607 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to provide a low frequency antenna module and a keyless entry system including the same capable of increasing assembly and productivity.

In order to solve the above problems, the present invention is a magnetic core having a protrusion that protrudes in one direction from a plate-shaped core body having a predetermined area; A coil wound along a circumference of the protrusion; A magnetic sheet having an insertion hole formed in a region corresponding to the protrusion and having an end portion of the protrusion coupled to the insertion hole to cover one surface of the coil; It provides a low-frequency antenna module including a; base member having at least two connection terminals connected to both ends of the coil.

In addition, the coil may be covered with an upper surface and a lower surface through the core body and the magnetic sheet, respectively.

The protrusion may include a first protrusion through which the coil is wound, and a second protrusion protruding from the first protrusion so that the magnetic sheet may be coupled, and the insertion hole may correspond to the second protrusion. It can be formed through the region to be. In this case, the first protrusion may be formed to have a relatively larger size than the second protrusion.

In addition, the base member may have a through hole formed in a region corresponding to the second protrusion, so that the second protrusion may be inserted into the coupling hole.

In addition, the magnetic sheet may be separated into a plurality of fine pieces, the fine pieces may be atypical. For example, the magnetic sheet may be a ferrite sheet.

For example, the base member may be a circuit board on which the at least two connection terminals are formed, and the connection terminal may include a coil binding hole to which an end of the coil is wound.

As another example, the base member may be a circuit board on which the plurality of connection terminals are formed, and the connection terminals may be provided as four, and both ends of the coil may be spotted on two connection terminals of the four connection terminals. It can be welded.

In this case, a molding may be filled between the core body and the magnetic sheet, and the molding may cover the coil and simultaneously integrate the core body and the magnetic sheet.

As another example, the base member may be made of an insulating resin, and the pair of connection terminals may be insert molded.

In this case, the base member may include a side wall portion extending upwardly from the edge by a predetermined height, and the side wall portion may be prevented from being exposed to the outside by wrapping the side portion of the coil, and the pair of connection terminals are outside from the side wall portion. Protruding to include a coil binding port wound around the end of the coil.

In addition, the side wall portion may be formed in the wire arrangement groove which is introduced into the upper surface, the lead portion extending from the body of the coil wound around the coil binding hole may be disposed in the wire arrangement groove.

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

In another embodiment, the low frequency antenna module described above among the receiver and the transmitter constituting the keyless entry system may be embedded in the receiver to implement the keyless entry system.

According to the present invention, it is possible to configure the antenna module through the assembly method to prevent damage and deformation of the magnetic core that may occur during processing can increase the reliability and increase work productivity.

1 is a schematic diagram showing a low frequency antenna module according to an embodiment of the present invention;
2 is an exploded view of FIG. 1,
3 is a cross-sectional view taken along AA direction of FIG. 1;
4 is a view illustrating a state in which a molding is filled in a space in which a coil is accommodated in FIG. 3;
5 is a schematic diagram showing a low frequency antenna module according to another embodiment of the present invention;
6 is an exploded view of FIG. 5;
7 is a sectional view taken along line BB of FIG.
FIG. 8 is a view illustrating a state in which moldings are filled in a space in which a coil is accommodated in FIG. 7;
9 is a schematic diagram showing a low frequency antenna module according to another embodiment of the present invention;
FIG. 10 is a partially cutaway view of the magnetic core and the base member as the separation view of FIG. 9; FIG.
11 is a cross-sectional view taken along the direction CC of FIG. 9, and
12 is a plan view illustrating a case in which a magnetic sheet applied to a low frequency antenna module according to the present invention is separated into a plurality of fine pieces.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

Low frequency antenna module (100, 200, 300) according to an embodiment of the present invention is a magnetic core 110, coil 120, magnetic sheet 130 and the base member (140, 240, 340) as shown in Figs. It includes.

The magnetic core 110 may serve as an inductor core by shielding an electromagnetic field generated from the coil 120.

To this end, the magnetic core 110 may be made of a material having a magnetic so as to form an inductor core. For example, the magnetic core 110 may be a sintered ferrite such as Mn-Zn, Ni-Zn, or Ni-Cu-Zn, but is not limited thereto. A soft magnetic alloy having a dust core, an amorphous or nanocrystalline structure may be used. As long as it can be used as an inductor core, all known magnetic materials can be used without limitation.

Such a magnetic core 110 may be disposed to pass through the hollow portion of the coil 120 at least a portion of which is wound several times. As a result, the magnetic core 110 may be coupled to the magnetic sheet 130 and the base members 140, 240, and 340 as well as supporting the coil 120 as shown in FIGS. 3, 7, and 11. have.

To this end, the magnetic core 110 may include a plate-shaped core body 111 having a predetermined area and at least one protrusion 112, 113 protruding a predetermined length in one direction from one surface of the core body 111. have.

As a result, the magnetic core 110 is sequentially disposed on one surface of the magnetic core 110 through the protrusions 112 and 113, as shown in FIGS. 2, 6, and 10. It may be combined with the members (140, 240, 340).

As a specific example, the magnetic core 110 has a first protrusion 112 protruding from one surface of the core body 111 and a second protrusion protruding from one surface of the first protrusion 112 at a predetermined length. It may include a protrusion 113.

Through this, the first protrusion 112 may pass through the hollow portion of the coil 120 to support the coil 120, and the second protrusion 113 may be formed of the magnetic sheet 130 and the base member ( 140, 240, 340 may be combined.

In this case, the magnetic sheet 130 may pass through the insertion hole 130a having a predetermined area at a position corresponding to the second protrusion 113 to pass through the second protrusion 113.

Here, the first protrusion 112 may be formed to have substantially the same size as the hollow portion of the coil 120, the second protrusion 113 is formed to have approximately the same size as the insertion hole (130a). Can be. In addition, the second protrusion 113 may be formed to have a relatively smaller size than the first protrusion 112.

In the present invention, the first protrusion 112, the second protrusion 113 and the insertion hole 130a may be formed in the central portion of the core body 111 and the magnetic sheet 130, the first protrusion ( 112, the position of the second protrusion 113 and the insertion hole 130a is not limited thereto, and the position and the number may be appropriately changed as long as they can be coupled to each other. In addition, the core body 111, the first protrusion 112 and the second protrusion 113 is shown as being formed in a substantially rectangular shape, but is not limited thereto, and may have a variety of shapes, such as circular, arc, elliptical, etc. Let's find out.

As described above, in the magnetic core 110 according to the exemplary embodiment, the first protrusion 112 and the second protrusion 113 protrude from the one surface of the core body 111 in a direction parallel to the height direction. The core body 111, the first protrusion 112, and the second protrusion 113 are formed to have a relatively small size or area so that sintering work using a mold can be performed, thereby increasing work productivity.

In addition, since a conventional process of grinding or cutting the side of the magnetic core 110 is omitted to form a receiving groove for disposing the coil 120, the process may be simplified, and the magnetic material generated during polishing or cutting may be omitted. Various problems such as cracking or breakage of the core 110 may be prevented at the source.

The coil 120 may generate a signal in a predetermined frequency band to perform wireless communication. To this end, the coil 120 may have a shape in which a conductive member having a predetermined wire diameter is wound a plurality of times in a loop shape so as to have a hollow part having a predetermined area therein.

For example, the coil 120 may be disposed to surround the side of the first protrusion 112 by winding a plurality of times in the same direction as the circumferential direction of the first protrusion 112. The hollow part may have the same size as the first protrusion part 112.

Accordingly, when the first protrusion 112 is inserted into the hollow side of the coil 120, the inner surface of the coil 120 wound a plurality of times may be in close contact with the side of the first protrusion 112. Upper and lower surfaces of the coil 120 may be disposed to contact one surface of the core body 111 and the magnetic sheet 130, respectively.

Accordingly, the low frequency antenna module 100, 200, 300 according to an embodiment of the present invention through the magnetic core 110 and the magnetic sheet 130, the upper and lower surfaces and the inner surface except for the outer portion of the coil 120 made of a magnetic material Since both can be covered, the signal transmitted in the Z-axis direction parallel to the height direction of the magnetic core 110 can be stably received.

Here, the coil 120 may be an enameled wire in which enamel insulation is formed on the outside of a copper wire having a predetermined wire diameter. However, the material of the coil is not limited thereto, and it is understood that all materials can be used as long as the conductive material is covered with an insulating layer.

The magnetic sheet 130 may be disposed on one side of the coil 120 to shield the electromagnetic field generated from the coil 120.

To this end, the magnetic sheet 130 may be made of a magnetic material to shield the electromagnetic field generated by the coil 120. For example, the magnetic sheet 130 may be a ferrite sheet, a polymer sheet, an amorphous ribbon sheet or a nano-crystalline ribbon sheet. However, the type of the magnetic sheet 130 is not limited thereto, and it is understood that all known magnetic materials may be used.

In this case, the magnetic sheet 130 may be formed in a plate shape having a predetermined area and may be combined with the second protrusion 113 of the magnetic core 110, and have a relatively larger area than the outer diameter of the coil 120. It may be provided to have. Here, the magnetic sheet 130 may be formed through the insertion hole 130a to which the second protrusion 113 is coupled to a region corresponding to the second protrusion 113 as described above. In addition, the magnetic sheet 130 is attached to one surface of the coil 120 through the adhesive member 131 interposed on one surface in a state in which the magnetic sheet 130 is coupled to the second protrusion 113 through the insertion hole 130a. May be

Accordingly, when the magnetic sheet 130 and the magnetic core 110 are coupled to each other, the side of the first protrusion 112 and the core body 111 of the magnetic core 110 and the side surfaces of the first protrusion 112 are magnetic. An accommodation space defined by one surface of the sheet 130 may be formed, and the coil 120 may be disposed on the accommodation space side.

For this reason, the low frequency antenna modules 100, 200, and 300 according to an embodiment of the present invention have the magnetic core 110 and the inner surface, the upper surface, and the lower surface of the coil 120 when the coil 120 is disposed in the accommodation space. The radiation path of the electromagnetic field generated by the coil 120 surrounded by the magnetic sheet 130 may be limited to the side of the magnetic core 110. Through this, the radiation characteristics of the coil 120 can be improved, and the reception sensitivity in the desired direction can be improved.

On the other hand, the low frequency antenna module (100,200) according to an embodiment of the present invention as shown in Figure 4 and 8 by the core body 111, the side of the first protrusion 112 and the magnetic sheet 130 The molding 160 may be filled on the receiving space side.

The molding 160 covers the coil 120 wound along the first protrusion 112 in the accommodation space and simultaneously integrates the core body 111 and the magnetic sheet 130 in a hardened state. Can be. Accordingly, when the lead parts 121 formed at both end sides of the coil 120 are connected to the connection terminals 150 and 250 of the base members 140 and 240 which will be described later through winding or welding, disconnection may occur due to an external impact. Can be prevented from being separated or separated. In addition, by improving the bonding force between the magnetic sheet 130 and the base member (140,240) coupled through the second protrusion (113) it can solve the vulnerability to external shock.

Meanwhile, the magnetic sheet 130 applied to the low frequency antenna modules 100, 200, and 300 according to an embodiment of the present invention may be separated into a plurality of fine pieces so as to improve flexibility as shown in FIG. The plurality of microflakes may be formed irregularly. In this case, the low frequency antenna module (100, 200, 300) is a pair of protective film 132 on both sides of the magnetic sheet 130 as shown in Figures 2, 6 and 10 media the adhesive member 131 Can be attached. Through this, even though the magnetic sheet 130 is separated into a plurality of fine pieces, the positions of the plurality of fine pieces may be fixed through the adhesive member 131. Here, at least one of the pair of protective films 132 may be a release film removed during the attachment process (see FIGS. 3, 7 and 11).

As a specific example, the magnetic sheet 130 may be made of a ferrite sheet, the ferrite sheet may be flake-treated to be separated into a plurality of fine pieces. Through this, the flexibility of the brittle ferrite sheet is improved to prevent or minimize the occurrence of cracks or cracks when attached to the magnetic core (110). As a result, it is possible to prevent the characteristic of the initial design value from being changed or minimize the characteristic change.

The base members 140, 240, and 340 may provide an electrical connection with the coil 120 such that power supplied from the outside may be supplied to the coil 120. That is, the base members 140, 240 and 340 may be disposed on one side of the magnetic sheet 130, and may be coupled to the magnetic core 110.

As a specific example, the base member 140, 240, 340 may be formed through the coupling hole 142 is coupled to the second protrusion 113 of the magnetic core 110, the coupling hole 142 is the magnetic sheet ( It may be formed in a region corresponding to the insertion hole (130a) formed in the 130. Accordingly, the magnetic core 110, the magnetic sheet 130, and the base members 140, 240, and 340 may be simultaneously fastened through the second protrusion 113.

Here, the magnetic core 110, the magnetic sheet 130 and the base member (140, 240, 340) is shown and described as being coupled at the same time through the second protrusion 113, but is not limited to this, the second protrusion 113 A third protrusion (not shown) is formed on one surface of the base, and the third protrusion is inserted into the coupling hole 142 formed in the base members 140, 240, and 340 so that the base members 140, 240, and 340 are magnetic cores 110. It can be combined with).

On the other hand, the base member (140, 240, 340) may include at least two connection terminals (150, 250, 350) connected to both ends of the coil 120, respectively.

Accordingly, the low frequency antenna module 100, 200, 300 according to an embodiment of the present invention is electrically connected to another electronic component (eg, a main circuit board) through the connection terminals 150 and 350 included in the base members 140, 240 and 340. Power supplied from the outside may be supplied to the coil 120 through the connection terminals 150, 250, and 350.

As a specific example, the low-frequency antenna module 100 according to an embodiment of the present invention is a circuit board including the base member 140 includes a pair of connection terminals 150 as shown in FIGS. 1 to 4. The pair of connection terminals 150 may have a shape including a coil binding hole 152 protruding outward from the body.

In this case, the pair of leads 121 formed at both end portions of the coil 120 may be wound around the coil binding port 152 so that the coil 120 and the connection terminal 150 may be electrically connected to each other. have.

As another example, the low frequency antenna module 200 according to an embodiment of the present invention may be a circuit board in which the base member 240 includes a plurality of connection terminals 250 as illustrated in FIGS. 5 to 8. have. In this case, the plurality of connection terminals 250 may be provided as four, and the four connection terminals 250 may be spaced apart along the circumferential direction of the circuit board.

In this case, the lead 121 of the coil 120 may be directly welded to two of the four connection terminals 250. For example, the lead part 121 of the coil 120 may be spot welded to one surface of the connection terminal 250. That is, some of the plurality of connection terminals 250 may play an electrical role with the coil 120 and may be connected with an external circuit board through soldering, and the remaining coils 120 may not be connected. The connection terminal 250 may be soldered with the external circuit board to improve the bonding force with the external circuit board. In addition, the connection terminals 250 are soldered to the external circuit boards at four positions, respectively, to achieve overall balancing or leveling, thereby increasing the bonding force and stably fixing the position.

However, the number of the connection terminals 250 is not limited thereto, and the total number of the connection terminals 250 may be appropriately changed if the number of the connection terminals 250 is provided in three or more and spaced apart in the circumferential direction of the circuit board. Let's find out.

As another example, in the low frequency antenna module 300 according to an embodiment of the present invention, the base member 340 may be made of an insulating resin, as shown in FIGS. 9 to 11, and the pair of connection terminals 350 may be integrated with the insulating resin through insert molding.

In this case, the connection terminal 350 may be formed of a conductive member, and the conductive member may include a terminal portion 351 exposed to the bottom and side surfaces of the base member 340 and the outside as illustrated in FIG. 10. It may include a coil binding port 352 extending from the end of the terminal portion 351 protruding from the base member 340 to the outside.

As a result, the pair of leads 121 formed at both end sides of the coil 120 may be wound around the coil binding port 352 so that the coil 120 and the connection terminal 350 may be electrically connected to each other. .

Accordingly, the surface of the conductive member may be insulated by embedding the remaining portion of the conductive member except for the terminal portion 351 and the coil binding hole 352 in the base member 340 made of an insulator.

In this case, the base member 340 may have a shape of an enclosure having an upper portion opened by forming a sidewall portion 342 extending upwardly from the edge of the base body 341 having a predetermined area by a predetermined height.

Accordingly, when the base member 340 and the magnetic core 110 are coupled to each other, the side wall 342 covers the side of the coil 120 disposed in the accommodation space, thereby exposing the coil 120 to the outside. It can be prevented to protect the coil 120 from the external environment.

Here, when the base member 340 includes the side wall portion 342, the terminal portion 351 of the connection terminal 350 may be provided to be exposed to the bottom and side surfaces of the base member 340. The coil binding hole 352 may be formed to protrude to the outside in the middle of the height of the side wall portion 342.

In addition, the side wall portion 342 of the lead portion 121 is extended from the body of the coil 120 by the wire arrangement groove 343 is formed in the upper surface to be wound in the coil binding hole 352 The middle of the length may be arranged.

The low frequency antenna module (100, 200, 300) according to the present invention described above may be implemented as a Z-axis antenna module, it is applied to the X-axis antenna and Y-axis antenna wound coil in a conventional bar-shaped magnetic core to a three-axis antenna module It may be implemented.

In addition, the low frequency antenna modules 100, 200, and 300 described above may be applied to a keyless entry system including a low frequency transmitter and a low frequency receiver.

For example, the low frequency antenna module (100, 200, 300) may be installed in a key fob (KEY FOB) embedded in a wearable device such as a smart terminal, a portable terminal such as a smart phone or a smart watch that the user carries, VR devices, AR It can be applied to various electronic devices such as appliances.

The key fob may include a low frequency (LF) receiver including a low frequency antenna module (100, 200, 300), a 3D active immobilizer, and a microcontroller.

Accordingly, wireless communication using a predetermined band is performed between the key fob mounted on the smart key 10 and the control unit mounted on the vehicle to wirelessly perform at least one lock of the door or steering of the vehicle. lock or unlock can be controlled.

In addition, the low-frequency antenna module (100, 200, 300) described above is a keyless start system that allows the driver to operate the vehicle by starting, operating and stopping the engine in an electronically authenticated state without the insertion or manipulation of a separate mechanical key. Note that it can also be applied. In addition, it should be noted that the above-described low frequency antenna module 100 may be implemented as a low frequency transmitter constituting a keyless entry system.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention, within the scope of the same idea, the addition of components Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

100,200,300: Low Frequency Antenna Module
110: magnetic core 111: core body
112: first protrusion 113: second protrusion
120: coil 121: lead portion
130: magnetic sheet 130a: insertion hole
131: adhesive member 132: protective film
140,240,340: base member 142: coupling hole
341: base body 342: side wall
343: coil arrangement groove 150,250,350: connection terminal
152: coil binding port 351: terminal
352: coil binding unit

Claims (19)

A magnetic core having at least one protrusion protruding in one direction from a plate-shaped core body having a predetermined area;
A coil wound along a circumference of the protrusion;
A magnetic sheet having an insertion hole formed in a region corresponding to the protrusion and having an end portion of the protrusion coupled to the insertion hole so as to cover one surface of the coil; And
And a base member having at least two connection terminals to which both ends of the coil are connected.
The protrusion includes a first protrusion in which the coil is wound, and a second protrusion protruding from the first protrusion so that the magnetic sheet can be coupled thereto.
The insertion hole is formed through the area corresponding to the second protrusion,
The base member is a low-frequency antenna module that is formed through the coupling hole in the region corresponding to the second projection portion is inserted into the coupling hole. The method of claim 1,
The coil is a low-frequency antenna module that the upper and lower surfaces are respectively covered by the core body and the magnetic sheet. delete The method of claim 1,
The low frequency antenna module of claim 1, wherein the first protrusion has a relatively larger size than the second protrusion.
delete The method of claim 1,
The magnetic sheet is a low frequency antenna module which is a sheet formed separated into a plurality of fine pieces. The method of claim 1,
The magnetic sheet is a ferrite sheet low frequency antenna module. The method of claim 1,
The base member is a low frequency antenna module of the circuit board formed with the at least two connection terminals. The method of claim 8,
The connection terminal is a low frequency antenna module including a coil binding port wound around the end of the coil. The method of claim 8,
The connection terminal is provided with four, both ends of the coil is a low frequency antenna module is spot welded to two of the four connection terminals. The method of claim 1,
A molding material is filled between the core body and the magnetic sheet, and the molding covers the coil and simultaneously integrates the core body and the magnetic sheet. The method of claim 1,
The base member is made of an insulating resin, at least two connection terminals insert molded low frequency antenna module. The method of claim 12,
The base member includes a side wall portion extending a predetermined height upward from the edge, the side wall portion is wrapped around the side of the coil to prevent exposure to the outside. The method of claim 13,
The connection terminal is protruding outward from the side wall portion and a low frequency antenna module including a coil binding port wound around the end of the coil. The method of claim 14,
The side wall portion has a wire arrangement groove which is introduced into the upper surface is formed in the inner side, the coil is a low-frequency antenna module is arranged in the wire arrangement groove lead portion extending from the coil body to the coil binding hole. A smart key incorporating the molded low frequency antenna module according to any one of claims 1, 2, 4, and 6 to 15. A portable terminal having a built-in low frequency antenna module according to any one of claims 1, 2, 4, and 6 to 15. A wearable device having a built-in low frequency antenna module according to any one of claims 1, 2, 4, and 6 to 15. receiving set; And a transmitter; comprising a keyless entry system,
A keyless entry system in which the low frequency antenna module according to any one of claims 1, 2, 4 and 6 to 15 is incorporated in the receiver.

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