KR101552177B1 - LF Antenna for Vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an LF antenna for a vehicle, and more particularly, to a LF antenna for a vehicle which can be manufactured easily by ultrasonic welding and reduce a defect rate of a product.
The LF antenna for a vehicle of the present invention includes: a lower housing having an upper portion opened; A rod-shaped ferrite that is seated inside the lower housing; A circuit board disposed in the lower housing in a horizontal direction with respect to the ferrite; A coil surrounding the ferrite and having both ends connected to the circuit board; A connection terminal for connecting the circuit board to an external power source; And an upper housing covering an upper portion of the lower housing, wherein the lower housing and the upper housing are coupled by a fusion method.

Description

LF Antenna for Vehicle [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an LF antenna for a vehicle, and more particularly, to a LF antenna for a vehicle which can be manufactured easily by ultrasonic welding and reduce a defect rate of a product.

Generally, an LF antenna (Low Frequency Antenna) installed in a car equipped with a smart key system transmits and receives data for authentication of a car key held by a driver in a KHz band to a radio wave during operation of a starter key or a starter button And is mounted in a main part of an automobile interior and exterior.

An inductor, which is an inductive element, is provided in the LF antenna, which is driven by a control unit to generate an LF (Low Frequency) signal, which is recognized by a smart key to open or close the door of the vehicle, .

11, the antenna coil is directly wound on the outer side of the nickel-zinc (NiZn) ferrite (S10), and the antenna coil is directly wound on the ferrite of nylon (S11), or the ferrite directly wound on the antenna coil is mounted on the inside of the case of the LF antenna (S12) after the insert injection process (for example, 68 bar, 240 deg. (S14), and the drying process (S16) for naturally drying the injection-molded LF antenna is performed.

The nylon insert injection molding is performed at a very high pressure and high temperature of, for example, 68 bar and 240 ° C, and the ferrite is broken during the operation, or the antenna coil wound directly on the ferrite is pushed There is a problem that the antenna coil becomes unstable in electric characteristics.

In addition, the injection molding using Epoxy requires an additional drying space and a drying place since Epoxy is injected for 24 hours to maintain a natural drying condition. Therefore, the manufacturing cost for manufacturing the LF antenna is increased There was a problem.

Korean Patent Publication No. 10-2013-0013376 (published February 02, 2013)

The present invention has been made to solve the above problems, and it is an object of the present invention to prevent the ferrite from being damaged during manufacture, The present invention provides an LF antenna for a vehicle that can be manufactured at a low cost and can improve productivity.

According to an aspect of the present invention, there is provided an LF antenna for a vehicle comprising: a lower housing having an upper opening; A rod-shaped ferrite that is seated inside the lower housing; A circuit board disposed in the lower housing in a horizontal direction with respect to the ferrite; A coil surrounding the ferrite and having both ends connected to the circuit board; A connection terminal for connecting the circuit board to an external power source; And an upper housing covering an upper portion of the lower housing, wherein the lower housing and the upper housing are coupled by a fusion method.

The lower housing and the upper housing are coupled by any one of ultrasonic welding, heat welding, and vibration welding.

An assembling protrusion is protruded from one of the rim portions of the lower housing or the upper housing and an assembling recess into which the assembling protrusion is inserted is formed in the other.

A fixing protrusion is protruded upward from an inner bottom surface of the lower housing, and the coil is fixed to the fixing protrusion while being fixed to the circuit board.

The upper end of the fixing protrusion may be formed with a concave groove portion having a smaller width to be wound on the coil.

In the lower housing, a seating portion is formed in which one end of the ferrite disposed adjacent to the circuit board is seated and fixed.

At this time, the width of the seating portion is equal to or smaller than the width of the ferrite, and the ferrite is forcibly inserted into the seating portion.

Alternatively, a fixing protrusion may protrude upward from the seating portion, and the coil may be fixed to the fixing protrusion and then connected to the circuit board.

A sealing groove is formed in one end of the lower housing and one end of the upper housing to form a through hole, the through-hole having a columnar sealing member mounted thereon, the connection terminal passing through the sealing member, Lt; / RTI >

Alternatively, one end of the lower housing or one end of the upper housing may be provided with a through-hole for communicating the inside and the outside, and a columnar sealing member may be seated on the through-hole. The connecting terminal may pass through the sealing member, Lt; / RTI >

Wherein the sealing member has a plurality of pressing rings formed on an outer circumferential surface thereof, and a connecting hole through which the connecting terminal passes is formed on an inner circumferential surface thereof, the diameter of the pressing ring being larger than the diameter of the through- .

The other end of the sealing member disposed adjacent to the circuit board is provided with a latching groove along the outer circumferential surface thereof, and the lower housing has a latching protrusion inserted into the latching groove.

A cushioning member is disposed on the upper surface or lower surface of the ferrite.

The vehicle LF antenna according to the present invention as described above has the following effects.

By joining the upper housing and the lower housing through a fusion method such as ultrasonic wave, heat or vibration, the ferrite can be broken or the coil wound on the ferrite can be prevented from being pushed when assembling and manufacturing the LF antenna.

In addition, since the fusion welding method is employed, it can be manufactured in a short time, so that the manufacturing cost can be lowered and the productivity can be improved, and the inside and the outside of the housing can be sealed to prevent water or the like from being introduced into the interior.

1 is a perspective view of a vehicle LF antenna according to a first embodiment of the present invention,
FIG. 2 is a perspective view of the state where the upper housing is removed in FIG. 1,
3 is an exploded perspective view of a vehicle LF antenna according to a first embodiment of the present invention,
4 is a sectional view taken along the line A-A 'in Fig. 1,
5 is a sectional view taken along the line B-B 'in Fig. 1,
6 is a perspective view of a vehicle LF antenna according to a second embodiment of the present invention,
7 is a one-directional perspective view of the state in which the upper housing is removed in Fig. 6,
FIG. 8 is a perspective view in the other direction with the upper housing removed in FIG. 6,
9 is an exploded perspective view of a vehicle LF antenna according to a second embodiment of the present invention,
10 is a sectional view taken along the line C-C 'in FIG. 6,
11 is a flowchart schematically showing a manufacturing process of a conventional LF antenna for a vehicle,

First Embodiment

FIG. 1 is a perspective view of a vehicle LF antenna according to a first embodiment of the present invention, FIG. 2 is a perspective view of the LF antenna according to the first embodiment of the present invention, FIG. 4 is a sectional view taken along line A-A 'of FIG. 1, and FIG. 5 is a sectional view taken along line B-B' of FIG.

1 to 5, the vehicle LF antenna of the first embodiment includes a lower housing 10, an upper housing 20, a circuit board 30, a ferrite 40, a coil 50, A connection terminal 60, and a sealing member 70. [

The lower housing 10 is formed in an open top shape, and an empty space for arranging other structures therein is formed.

Further, the upper housing 20 is formed in a lower open shape, and an empty space for disposing other structures therein is formed.

The lower housing 10 and the upper housing 20 are made of the same synthetic resin material and the upper housing 20 covers the upper portion of the lower housing 10 to be coupled.

The lower housing 10 and the upper housing 20 are respectively formed with protruding rims in mutually opposing directions and the lower housing 10 and the upper housing 20 are joined to each other by a fusion method in the rim portion. do.

As a method of fusing the lower housing 10 and the upper housing 20, any one of ultrasonic welding, heat welding, and vibration welding may be used.

In the present invention, the lower housing 10 and the upper housing 20 are manufactured separately and then joined together through a fusion method, thereby facilitating fabrication and coupling, The sealing effect inside and outside can be further increased.

An assembling protrusion 11 is protruded from one of the rims of the lower housing 10 or the upper housing 20 and an assembling recess 21 into which the assembling protrusion 11 is inserted is formed do.

The assembling protrusion 11 and the assembling groove 21 can be used to easily arrange the upper housing 20 at the initial position of the lower housing 10 without being twisted at the initial position.

The coupling projections 11 and the coupling grooves 21 can extend the path of the coupling portion between the upper housing 20 and the lower housing 10 so that external moisture or the like can pass the coupling path So that it is possible to minimize the possibility of easy introduction into the inside.

Fusible projections 12 and 22 are protruded from the assembly projections 11 and / or the assembly grooves 21 to be melted by an external force such as ultrasonic waves.

The fusion protrusions 12 and 22 are melted by an external force such as ultrasonic waves between the assembling protrusions 11 and the fitting recesses 21 so that the upper housing 20 and the lower housing 10 are stronger and more perfect So that the inside and the outside can be sealed.

The circuit board 30 is disposed horizontally with the ferrite 40 in the lower housing 10.

The upper and / or lower surfaces of the circuit board 30 are supported and fixed by support protrusions protruding from the lower housing 10 and / or the upper housing 20.

The ferrite (40) is formed in a bar shape, and is positioned in the horizontal direction with the circuit board (30) inside the lower housing (10).

At this time, a seating part 13 for preventing the ferrite 40 from flowing during assembly or assembly is formed in the lower housing 10.

The seat portion 13 may be formed as a separate component from the lower housing 10, or may be integrated with the lower housing 10.

One end of the ferrite (40) disposed adjacent to the circuit board (30) is seated and fixed in the seating part (13).

The seating part 13 is open in the direction of the upper part and the ferrite 40 and is formed in a substantially 'C' shape when viewed from above.

The ferrite 40 mounted on the seating part 13 may be fixedly coupled through a bond or the like but the ferrite 40 is forcedly inserted into the seating part 13 to reduce the number of assembling steps.

For this purpose, the width of the seating portion 13 is equal to or smaller than the width of the ferrite 40, and the ferrite 40 is forcibly inserted into the seating portion 13 and fixed.

The coil 50 surrounds the ferrite 40, and both ends of the coil 50 are connected to the circuit board 30.

An insulating sheet or the like may be disposed between the ferrite (40) and the coil (50).

In order to prevent the coil 50 surrounding the ferrite 40 from being unwound or flowing, two fixing protrusions 14 protrude upward from the inner bottom surface of the lower housing 10.

The coil 50 is wound around the fixing protrusion 14 and is connected to the circuit board 30. [

At this time, a concave groove 15 is formed at the upper end of the fixing protrusion 14 so that the width of the concave groove 15 is reduced to be wound on the coil 50.

The shape of the concave groove 15 may be modified into various shapes other than those shown in the drawings.

Due to such a structure, the coil 50 wound around the ferrite 40 is prevented from being unwound by being fixed by the fixing protrusion 14, and both ends of the coil 50 are fixed to the circuit board 30 It is possible to prevent the coil 50 from being unwound or flowing when soldering.

Since the fixing protrusion 14 protrudes upwardly, the operator can easily fasten and fix the coil 50 to the fixing protrusion 14, and by the concave groove 15, It is possible to prevent the coil 50 wound on the protrusion 14 from moving out of the fixing protrusion 14 and coming off.

The connection terminal 60 connects the circuit board 30 to an external power source.

To this end, one end of the lower housing 10 and one end of the upper housing 20 are formed with sealing grooves 17 and 27 forming through-holes 19 in contact with each other, Is disposed through the hole (19).

The connection terminal 60 may be disposed to directly contact the inner circumferential surface of the sealing grooves 17 and 27. However, in order to increase the sealing force, the columnar sealing member 70 is seated in the through hole 19 .

Therefore, the connection terminal 60 is connected to the circuit board 30 through the sealing member 70.

A plurality of pressing rings 71 are formed on the outer circumferential surface of the sealing member 70 and the connection terminals 60 are formed on the inner circumferential surface of the sealing member 70. The sealing member 70 is made of a material having elasticity such as rubber or silicon, A through hole 72 is formed.

The diameter of the pressure ring (71) is larger than the diameter of the through hole (19), and the diameter of the connection terminal (60) is larger than the diameter of the connection hole (72).

As a result, the outer circumferential surface and the inner circumferential surface of the sealing member 70 are brought into close contact with the sealing grooves 17 and 27 and the connection terminal 60, respectively, so that external moisture or the like can be prevented from flowing through the sealing grooves.

A cushioning member 80 such as a sponge or a rubber pad is disposed on the upper surface and / or the lower surface of the ferrite 40.

It is possible to prevent the ferrite 40 from being broken when an external force is applied by the buffer member 80 and to prevent the ferrite 40 from flowing arbitrarily.

Second Embodiment

6 is a perspective view of a vehicle LF antenna according to a second embodiment of the present invention. FIG. 7 is a perspective view of the LF antenna according to the second embodiment of the present invention with the upper housing removed. FIG. 9 is an exploded perspective view of a vehicle LF antenna according to a second embodiment of the present invention, and FIG. 10 is a sectional view taken along line C-C 'of FIG.

6 to 10, the second embodiment is different from the first embodiment in that the lower housing 10, the upper housing 20, the sealing member 70, the seat 13, There is a difference between the two.

The second embodiment differs from the first embodiment in that one end of the lower housing 10 is formed with a through hole 19 for communicating the inside and the outside.

The upper housing 20 is designed to cover only the open upper portion of the lower housing 10.

The coupling structure of the lower housing 10 and the upper housing 20 is the same as that of the first embodiment, and a detailed description thereof will be omitted.

The sealing member (70) is seated in the through hole (19).

At the other end of the sealing member 70 disposed adjacent to the circuit board 30, a latching groove 78 is formed along the outer circumferential surface.

The lower housing 10 is formed with a latching protrusion 18 inserted into the latching groove 78.

Therefore, when the sealing member 70 is inserted into the through hole 19 and then assembled, when the engaging groove 78 is inserted into the engaging protrusion 18, the sealing member 70 is inserted into the through- (19) by being caught by the through-hole (18).

Further, in the second embodiment, the seat portion 13 is separated from the lower housing 10 in a separate configuration.

A fixing protrusion 14 protrudes upward from the seating part 13 and the coil 50 is wound around the fixing protrusion 14 and is connected to the circuit board 30. [

The circuit board 30 is inserted into the seating part 13 at one end and the ferrite 40 is inserted into the other end.

The fixing protrusion 14 is formed on the seating portion 13 and the seating portion 13 is formed separately from the lower housing 10 so that the ferrite 40 and the circuit board 30 The coil 50 can be wound around the fixing protrusion 14 and connected to the circuit board 30 after the coil 50 is inserted into the seating portion 13 so that the ferrite and the circuit board 30 ) And the like, it is easy to assemble and manufacture the LF antenna as a whole.

Other details are the same as those of the first embodiment, and a detailed description thereof will be omitted.

The vehicle LF antenna according to the present invention is not limited to the above-described embodiments, but can be variously modified and embodied within the scope of the technical idea of the present invention.

The present invention relates to a sealing member for sealing a sealing member of a sealing member and a sealing member for sealing the sealing member,
20: upper housing, 21: assembly groove, 22: fused projection, 27: sealing groove,
30: circuit board,
40: ferrite,
50: coil,
60: connection terminal,
70: sealing member 71: pressure ring, 72: connecting hole, 78:
80: buffer member,

Claims (13)

A lower housing having an upper opened portion;
A rod-shaped ferrite that is seated inside the lower housing;
A circuit board disposed in the lower housing in a horizontal direction with respect to the ferrite;
A coil surrounding the ferrite and having both ends connected to the circuit board;
A connection terminal for connecting the circuit board to an external power source;
An upper housing which covers an upper portion of the lower housing and is coupled to the lower housing by a fusion method;
A buffer member disposed on an upper surface or a lower surface of the ferrite;
And a seating part formed in the lower housing and having one end of the ferrite arranged adjacent to the circuit board in a fixed position,
A fixing protrusion protruding upward is formed in the lower housing, the coil is fixed to the fixing protrusion by being wound around the fixing protrusion, and then connected to the circuit board, wherein a concave groove portion having a reduced width is formed at the upper end of the fixing protrusion The coil is wound and fixed on the concave groove portion so that the coil is prevented from being loosened and flowed,
Wherein a through hole is formed between one end of the lower housing and one end of the upper housing so that the connection terminal is connected to the circuit board through the through hole and a columnar sealing member is seated on the through hole, And the inflow of moisture through the connection terminal penetrating portion is prevented. delete The method according to claim 1,
Wherein an assembling protrusion is protruded from one of the rim portions of the lower housing or the upper housing and an assembling recess is formed in the other of the assembling protrusions. delete delete delete The method according to claim 1,
Wherein the width of the seating portion is equal to or smaller than the width of the ferrite, and the ferrite is forcibly inserted into the seating portion. The method according to claim 1,
And the fixing protrusions are formed so as to protrude upward in the seating portion. The method according to claim 1,
And the through holes are formed in a manner that the sealing grooves formed at one end of the lower housing and one end of the upper housing are in contact with each other. The method according to claim 1,
Wherein one end of the lower housing or one end of the upper housing is provided with a through hole communicating between the inside and the outside,
A columnar sealing member is seated on the through-hole,
And the connection terminal is connected to the circuit board through the sealing member. The method according to claim 9 or 10,
Wherein the sealing member is formed with a plurality of pressing rings on an outer circumferential surface thereof and a connecting hole through which the connecting terminal passes,
The diameter of the pressing ring is larger than the diameter of the through hole,
And the diameter of the connection terminal is larger than the diameter of the connection hole. The method of claim 11,
Wherein a sealing groove is formed at the other end of the sealing member disposed adjacent to the circuit board along an outer circumferential surface thereof,
And the lower housing is formed with a latching protrusion which is inserted into the latching groove. delete

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