KR102254974B1 - Low frequency antenna for smart-key using vehicle - Google Patents

Abstract

The present invention relates to a low frequency (LF: Low Frequency) antenna for a vehicle smart key,
A core 20 in which a connector 40 for wiring connection of a low-frequency antenna for a smart key is formed integrally with a case 10 for an external configuration of the smart key antenna, and a coil 25 is wound inside the case 10 In the low-frequency antenna for a car smart key is formed with a coupling recess (11) for assembling by inserting;
Connector connection ends 51a and 51b for soldering connection with both ends 25a and 25b of the coil by being electrically connected from the connection terminals of the connector 40 through extensions 50 and 50' (11) A structure in which the front and rear coil fixing portions 31 and 32 are formed opposite to each other to fix the coil 25 at the both front and rear ends of the core cap 30, and are exposed to the upper left and right sides. Consists of,
When assembling the core 20, which fixes both ends 25a and 25b of the coil to the front and rear coil fixing portions 31a, 32b, into the coupling recess 11, the front side of the core cap 30 Between the coil fixing part 31 and the rear coil fixing part 32, the connector connection ends 5a and 51b are located at both ends of the coil in the space between the pre-coil fixing part 31 and the rear coil fixing part 32. It is characterized in that the upper portion of the portion where both ends 25a and 25b of the coil and the connector connection ends 51a and 51b abut against each other is opened to facilitate soldering access by protruding to a height contacting the (25a) and 25b.

Description

Low frequency antenna for smart-key using vehicle

The present invention relates to a low frequency (LF) antenna for an automobile smart key, and in more detail, the assembly structure of components is simplified to reduce soldering points, as well as to simplify and solidify the soldering operation of the coil, further enhancing the automation process. It relates to a suitable low-frequency antenna for automobile smart keys.

With the development of vehicle-related technology, various control and information transmission functions of the vehicle such as opening and closing of automobile doors and trunks, vehicle starting, and opening and closing of windows are being developed to conveniently operate using a smart key that uses a wireless low-frequency frequency instead of the existing automobile key. , Recently, it has also been announced that use of the NFC communication function of a communication device, a smartphone.

In the case of the smart key-applied vehicle, the door is automatically opened when the driver approaches the vehicle with the smart key, and the door is automatically locked when the vehicle is distant, or the side mirror when the driver holding the smart key approaches the vehicle. Is automatically unfolded, and the'Smart Welcome System', which welcomes the driver, is applied as the side mirror's puddle lamp and the driver's dashboard and pocket lighting are turned on.

For this, it is necessary to be able to send an electric signal that detects the approach of the smart key to the vehicle's ECU. To this end, 5 or more low frequency (LF) antennas are usually installed in the door handle, interior, bumper, and trunk of the vehicle. According to the approach of the smart key, it is configured and used to detect the approach of the smart key with an electrical signal communicated between the smart and the low-frequency antenna.

In this way, the smart key and the low frequency of the 125~134KHz band are communicated with the smart key by the low frequency antenna installed in the vehicle to confirm the access of the smart key.For the high efficiency of frequency communication, the smart key and the low frequency antenna for the vehicle communicating with the smart key are used. The length of the coil acting as an antenna must be optimally designed to tune the frequency of use so that it conforms to the standard, and each product must be manufactured according to the design standard, so that the reliability of communication operation must be high.

Conventional low-frequency antenna for automobile smart key, as in Korean Patent Application Publication No. 10-2013-0013376, a ferrite core having a coil wound and caps coupled to both ends thereof is coupled to the inside of the case, and the end of the coil is placed inside the case. Since it is connected to one end of the cable and the other end of the cable is connected to the connector from the outside of the case, it is very inconvenient and time consuming to connect and connect the end of the coil to one end of the cable of the non-fixed structure. It is consumed a lot, and the product is not compact because the cable is extended to the outside of the case, the connector is not fixed and moves, making handling inconvenient, and requiring a separate connector clip, leading to an increase in manufacturing cost.

In order to improve the problems of the prior art, Patent No. 10-1754575, which was previously applied and registered by the present applicant, is coated with insulating paper on the ferrite core 130 along the length direction as shown in FIG. After winding, one end of the ferrite core 130 is coupled to the connector-side cap 160 and the end of the ferrite core 130 is coupled to the cap 150 and inserted into the case 110 to form an assembly. After assembling by inserting into the inner space of the case 110 integrally formed with the core, the ends 141 and 142 of the coil wound on the core are soldered to the coil-side terminals 170 and 171 connected to the cap, and the By connecting the coil terminals 170, 171 and the connector terminals 121, 122 in a clinching structure in a contact type, soldering work is more simple and quicker than before, and the product is compact, reducing the installation area and installing it. The advantage was given to make the work easier.

Nevertheless, the applicant of the present invention derives problems in terms of productivity and yield in the manufacturing process, as well as the structural part that needs further improvement in the process of repeating manufacturing even in the improved low-frequency antenna.

First, the improved prior art is a ferrite core 170 for electrical connection between the coil terminals, and the coil wire portion separated from the unwound ends 141 and 142 of the coil to the coil terminals 170 and 171. The core 170 in the coil-wound state by soldering is fixed to the core fixing cap 160, and the core fixed to the cap is assembled in the case, and then connected at the connector connection end 121a insert-molded inside the case. After connecting the end 121c to the coil side terminal in a clutching manner, the end of the coil is connected by soldering to the coil terminal.

In addition, in order to compensate for the concern that the electrical connection due to vibration, shock, oxide film formation, etc. of the clutching connection is not completed, a complementary method of soldering the end of the coil again to the connector connection end is used.

Since the coil terminal and the connector terminal are connected by the method described above, four soldering (soldering) work is performed at the end of the coil, which is an unwinded soldering point, to assemble a single low-frequency antenna for a smart key, resulting in unnecessary soldering. As the amount increases, the soldering shape is not neat before finishing. Furthermore, soldering defects do not occur only when the insulating coating of the coil to be soldered is completely peeled off. There was a problem of falling off.

In particular, since the ends of the coils wound around the core are not bound or restrained and are flexible and free, in order to solder to the coil terminals, soldering must be performed with the coil wires peeled off the insulating sheath to the coil terminals to ensure the overall quality of soldering. It becomes excellent, but such soldering workability is not good, so work skill is required, and thus, there is a problem in that it is difficult to implement automation of the soldering process.

In addition, in winding up the coil of the core, the assembly of the coil winding core was completed by attaching a cap to the end of the core and winding and soldering the coil to the protrusion formed on the cap. There was another problem that became.

This structure for the electrical connection between the coil terminal and the connector terminal, the number of assembly parts increases as the caps are coupled to both ends of the core, and this work becomes cumbersome as the coil winding of the core is fixedly connected to the end cap. Even when the optimum antenna coil length is set apart from the core and fixedly connected to the end cap and then the frequency is tuned to the length of the core again, a part that can exist as a variable may be caused as a problem.

Korean Patent Registration No. 10-1754575 (June 30, 2017) Republic of Korea Patent Publication No. 10-2016-0041226 (April 18, 2016) Korean Patent Registration No. 10-181437 (December 27, 2017) Korean Patent Registration No. 10-1724622 (April 3, 2017)

The present invention has been invented to solve the problems of the prior art, and provides an antenna for a smart key for a vehicle that can simplify the assembly structure of components, as well as make winding and soldering of a coil simple and robust. It has a purpose.

In addition, the present invention makes it possible to fix both ends of the coil wound around the core to the coil into which the core is inserted, but electrically connect and connect by direct soldering at the connector-side terminal without a soldering point, but both ends of the coil Since soldering is performed in a fixed state without flowing, it has excellent workability as well as automation. Compared to the fluidity of the coil wire, the amount of solder to be soldered is reduced, while the soldering-cooling in the fixed state prevents poor cold soldering. It is an object of the present invention to provide excellent soldering quality as well as excellent durability against shock and vibration as it does not occur.

The present invention conceived to achieve the above object,

A connector 40 for wiring connection of a low-frequency antenna for a smart key is formed integrally with the case 10 of the main body for the external configuration of the smart key antenna, and a core in which a coil 25 is wound inside the case 10 ( In the low-frequency antenna for a vehicle smart key formed with a coupling recess 11 for assembling by inserting 20);

Connector connection ends for soldering connection with both ends 25a and 25b of the coil by being electrically connected from the connection terminals 50 and 50 ′ of the connector 40 through the connector extensions 52 and 52 ′. 51) (51') is exposed upwardly on both left and right sides of the coupling recess 11, and front and rear coil fixing portions for fixing the coils 25 to both front and rear ends of the core cap 30, respectively ( 31) It is made of a structure in which (32) is formed opposite to each other;

When assembling the core 20, which fixes both ends 25a and 25b of the coil to the front and rear coil fixing parts 31a and 32b, into the coupling recess 11, the core cap 30 The connector connection end (51, 51') between the front coil fixing part 31 and the rear coil fixing part 32, the coil in the space between the pre-coil fixing part 31 and the rear coil fixing part 32. The door is configured to protrude to a height contacting both ends (25a) (25b), so that the portion where both ends of the coil (25a, 25b) and the connector connection ends (51) (51') are in contact with each other is opened at the top to facilitate soldering access. It characterized in that it was made.

In the present invention described above, at least one of the front and rear coil fixing portions 31 and 32 is characterized by having front and rear coil fixing grooves 31a and 32b for winding and fixing the coil.

In addition, connector extensions 52 and 52 ′ electrically connecting the connector connection ends 51 and 51 ′ to the connection terminals 50 and 50 ′ of the connector 40 are provided in the case 10. It is characterized in that it is an insert-molded structure.

In addition, the connector connection ends 51 and 51 ′ are formed with bent concave portions 51a and 51b made of semicircular grooves, so that between the front and rear coil fixing portions 31 and 32 of the core cap 30 Both ends 25a and 25b of the coil positioned at are inserted into the bent concave portions 51a and 51b to align the soldering positions. Here, the coupling concave portion 11 of the case has concave portions 15a and 15a facing the lower portion of the bent concave portions 51a and 51b at a lower position of the connector connecting ends 51 and 51 ′. It is characterized in that it has a structure in which the connector connection ends 51 and 51 ′ are seated and supported by forming seating protrusions 15 and 15 ′.

On the other hand, in the present invention described above, the coil 25 is wound on the core 20 in the longitudinal direction of the core, wound up by a set number of turns, and then returned, so that the ends 25a and 25b of the coil are It is characterized in that the length of the antenna coil corresponding to the used frequency is assumed as a length connected by soldering to the connector connection ends 51 and 51 ′ while being fixed to the fixing parts 31 and 32.

Accordingly, even in the prior art, the case connector connection end was exposed to the outside,

In the present invention, basically, the coil cap structure and the connector connection end position and structure are newly implemented so that the semicircular bent part of the connector connection end abuts and contacts the coil end (coil soldering part) fixed to the coil cap. Not only are there technical differences, but there are various advantages such as fairness, manufacturing cost, and product reliability.

More specifically, the present invention configured as described above is an insert-molded connector connection end (soldering portion) extending from the connector-side connection terminal to the electrical conductor in the main body case integrally formed with the connector, and the connector connection end is bent in a semicircular shape. A connector connection terminal extending from a connector integrally formed in the case by providing a coil cap structure and a new structure with the connector connection end position so that the part abuts and contacts the coil end (coil soldering part) fixed to the coil cap. Connection end) and both ends of the coil (coil soldering part) are connected to the connector connection terminal by direct soldering with the coil without passing through separate electrical connection terminals (contact connection terminals), reducing electrical resistance points.

The connector connection end of a semicircular groove formed at the connector connection end in a state where both ends of the coil, which are the wound ends of the coil, are wound and fixed to the front and rear coil fixing portions formed by spaced front and rear sides of the core cap coupled to the core. Since the soldering operation can be performed easily while being fixed by contacting the upper surface of the unit, it not only simplifies the assembly structure of the parts of the smart key antenna, but also provides the effect of making the soldering process operation of the coil simple and reliable.

In addition, since both ends of the coil wound on the core are directly connected to the connector terminals without a coil terminal by soldering, the soldering points can be reduced by half compared to the prior art, and the coil is fixed to the core cap. Because soldering is performed at, the soldering operation is not only simple, but also automation by the soldering machine is possible, and the lead melt can be stably solidified in a state where the lead melt is held in the semicircular groove when necessary for soldering, thereby preventing the possibility of occurrence of cold soldering. There will also be an effect that can further improve the stable quality and reliability against vibration or shock.

In addition, since it is soldered with lead in a contact state between the coil and the connector connection end, the effect of minimizing the electrical resistance from the coil to the connector is also expected.

1A to 1B are diagrams showing a low-frequency antenna previously applied by the present applicant.
Figure 2 is a perspective view showing an embodiment of the present invention antenna exterior.
Figure 3 is a bottom perspective view of Figure 2;
Figure 4 is a perspective view showing an assembly state before hot-melting of Figure 3;
Figure 5 is an exploded perspective view of the main part of Figure 4;
Figure 6 is an exploded perspective view of the core and the core cap of Figure 5;
7 is a cut-away perspective view of the main part of FIG. 4.
Figure 8 is an exploded perspective view of Figure 7;
9 and 10 are flow charts showing the assembly process of FIG. 4.
11 is a bottom perspective view showing another embodiment of the antenna of the present invention.
12 is a perspective view showing an assembled state before the hot melt of FIG. 11.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 2 to 12, the low-frequency antenna for an automobile smart key of the present invention includes a case 10, a core 20 and a core cap 30, a connector 40, and a connector connection end 51, 51'. It is equipped with.

The case 10 is formed with coupling flanges 12 and 12' at both ends in a rectangular shape, and the coupling flange 12 and 12' has a fastening hole 12a on one side for fastening by a fastening member. ), formed by forming a fastening long hole (12b) on the other side.

In addition, a coupling recess 11 is formed inside the case 10.

The core 20 is formed in the form of a square rod made of ferrite, but is constructed without using a conventional insulating paper on the outside, and the coil wound around the core is of a standard having good insulation quality while having good flexibility of the insulation coating. Choose.

In addition, the outer side of the core 20 is configured by winding the coil 25 in the longitudinal direction of the core, and an automatic winding machine may be used for a uniform winding. At this time, the coil 25 is directly wound from one end (A) of the core to the other end (B) along the length direction, and then changes the direction to the core from the other end (B) of the core to one end (A). Winding at wide intervals along the outside of the wound coil is constructed by winding so that both ends (25a) and (25b) of the coil are located in both sides from one end (A) of the core.

The core cap 30 is coupled to one end (A) of the core where both ends (25a) (25b) of the coil are located, not to both ends of the core (20), but the insertion hole (35) formed in the core cap Is inserted into one end of the core and combined.

The core cap 30 forms front and rear coil fixing portions 31 and 32 having front and rear coil fixing grooves 31a and 32a in front and rear positions on both sides of the cap to face the amount of the coil. The ends (25a) (25b) are wound around the fixing grooves (31a) (32a) of the front and rear coil fixing portions to be fixed.

That is, after winding the ends of the unwinded coil into the coil fixing groove 32b formed in the coil fixing portion at the rear position of the core cap, the ends 25a and 25b of the coil are wound and then re-wound the coil at the front position of the core cap. Since it is wound around the coil fixing groove 31a formed in the fixing part, both ends of the coil are fixedly installed between the before and after coil fixing parts 31 and 32 in a taut state.

The connector 40 is configured to be integrally formed in the case 10.

It goes without saying that the connector 40 may be integrally formed on one side of the case 10 as shown in FIG. 4 or formed integrally with the end of the case 10 as shown in FIG. 11.

The connector extensions 52 and 52 ′ leading from the connection terminals 50 and 50 ′ of the connector 40 are a pair of two-stranded conductors, and the amount of the core cap 30 inside the case from the connector 40 It is formed extending to a lateral position.

The connector connection ends 51 and 51 ′ are electrically connected by soldering in a state in which both ends 25a and 25b of the coil are in contact with each other.

In particular, since both ends 25a and 25b of the coil are directly soldered to the connector connection terminals 51 and 51 ′ without a separate core-side terminal previously used, the entire soldering process has been performed. It is reduced by half compared to and fixed by winding it around the hooks 31 and 32 on both sides of the core cap 30, not in a state in which the ends 25a and 25b of the coil are freely unconstrained. Since the soldering connection is possible by contacting the connector connection end in the locked state, the soldering position is constant, the soldering operation is quick and simple, and the automated process by the soldering machine is possible.

In addition, the connector connection ends 51 and 51 ′ are formed with bent concave portions 51a and 51b of semicircular grooves, and coil fixing portions 31 and 32 of the core cap before and after the core cap are formed on the upper portion of the bent recess. The wire portion of the coil positioned therebetween, that is, both ends 25a and 25b of the coil may be soldered in contact with each other.

At this time, the soldering solution can be firmly soldered with the amount of solder collected at the soldering point without easily flowing out of the soldering solution due to the semicircular bent portions 51a and 51b formed at the connector connection ends 51 and 51'. There will be.

In addition, a mounting protrusion 15 and 15 ′ having semicircular recesses 15a and 15a on the upper surface is formed at the coupling recess 11 of the case at the installation position of the connector connection ends 51 and 51 ′. Thus, the connector connection ends 51 and 51' are configured to be seated and installed.

In addition, a hot melt 70 may be injected into the coupling recess 11 of the case 10 after the core assembly is completed, or a cover (not shown) may be combined to be finished.

As a non-explanatory reference numeral, 60 denotes a soldering (soldering) site.

The following will describe the manufacturing process and operation of the present invention configured as described above.

First, the core cap 30 is coupled to one end A of the ferrite core 20.

In addition, the coil 25 is wound along the length direction without insulating paper on the core 20.

At this time, the coil 20 is tightly wound along the length direction from one end (A) of the core to the other end (B), and then the coil is wound around the core from the other end (B) to one end (A) of the core. Winding the coil at wide intervals along the outside of the coil is wound so that both ends (25a) and (25b) of the coil are located in both sides from one end (A) of the core.

In this state, both ends (25a) (25b) of the coil are wound around the coil fixing grooves (31a) (32a) of the coil fixing parts (31) (32) formed before and after the both sides of the core cap (30) and fixedly installed. However, the coil fixing groove 31a formed in the coil fixing part in the front position of the core cap after winding both ends 25a and 25b of the coil in the coil fixing groove 32b formed in the coil fixing part in the rear position of the core cap ), so that both ends of the coil are fixed in a taut state in the space between the before and after coil fixing parts 31 and 32.

When the core 20 having the coil wound around the core cap is prepared as described above, it is inserted into the coupling recess 11 of the case 10 to be coupled.

In this case, the core 20 is fixedly coupled so that movement is prevented by a support protrusion not described in the coupling recess 11 of the case 10.

In this way, when the core 20 is coupled to the coupling recess 11 of the case 10, both ends, which are the ends of the coils positioned between the coil fixing portions 31 and 32 before and after the core cap ( The 25a) and 25b are brought into contact with the connection ends 51 and 51' of the connector terminal.

At this time, the connection ends 51 and 51 ′ of the connector terminal are formed as semicircular bent concave portions 51a and 51b, and concave portions 15a and 15b formed on the seating protrusions 15 and 15 ′ inside the case. ), and accordingly, between the front and rear coil hook portions 31 and 32 of the core cap on the top of the bent concave portions 51a and 51b of the connector connection ends 51 and 51 ′. Both ends 25a and 25b of the positioned coil are maintained in a taut state in contact with each other.

As described above, soldering is performed while the core 20 is assembled to the case 10.

At this time, both ends of the coil are not in a free non-constrained state, but are positioned between the front and rear coil fixing parts 31 and 32 in a state that is wound around the coil fixing parts 31 and 32 of the core cap and fixed. Since both ends 25a and 25b of the coil are installed in contact with the connector connection ends 51 and 51', the soldering operation is very simple and easy.

In addition, while the case 10 is automatically moved to a state fixedly mounted on a jig (not shown), it is possible to perform an automated operation while continuously soldering by a soldering machine.

In particular, since the connector connection ends 51 and 51 ′, which are soldering points, are formed with semicircular bent concave portions 51a and 51b, both ends 25a and 25b of the coil are contacted to the upper portion of the bent recess for soldering. The soldering melt does not overflow from the bent concave portions 51a and 51b, but is collected in a gathered state, and a sufficiently robust soldering (soldering) operation is performed.

When the soldering operation is completed in this way, a hot melt is injected and molded on the upper front surface of the coupling recess 11 of the case 10 to complete manufacturing a low-frequency antenna for a smart key.

Accordingly, the present invention inserts and installs the core 20 on which the coil 25 is wound in the case 10 so that both ends 25a and 25b of the coil wound on the core are connected to the connector end 51 without a coil terminal. Directly connected to (51') by soldering, but the front and rear coil fixing portions 31 and 32 on both sides of the core cap 30 coupled to the core, the wires of the coil unwound, that is, both ends of the coil ( In a state in which the coil is in contact with the concave surface of the concave portions 51 and 51' formed in the semicircular grooves formed in the connector connection ends 51 and 51', which are soldered points while winding and fixing the 25a)(25b). Because of soldering, the electrical connection by soldering and the assembly structure of the entire antenna product to be assembled and soldered to the core-cap-coil-connection end can be simplified and the process can be simplified, and the soldering process of the antenna coil can be automated. Compared to that, it is possible to provide better soldering quality even with a small amount of lead consumption due to the structure in which the lead melt collects in less soldering points.

10: case 11: mating part
15,15': seating protrusion 15a,15b: concave portion
20: core 25: coil
25a, 25b: both ends of the coil 30: core cap
31,32: coil fixing part 31a,32b: coil fixing groove
40: connector 50,50': connector connection terminal
51,51': connector connection end 51a,51b: bent recess
52.52': connector extension

Claims (6)

A core 20 in which a connector 40 for wiring connection of a low-frequency antenna for a smart key is formed integrally with a case 10 for an external configuration of the smart key antenna, and a coil 25 is wound inside the case 10 The coupling recesses 11 for assembling by inserting are formed, and the core cap 30 is coupled to one end (A) of the core 20 where both ends (25a) (25b) of the coil (25) are located. In the low-frequency antenna for the smart key of the vehicle;
Connector connection ends for soldering connection with both ends 25a and 25b of the coil by being electrically connected from the connection terminals 50 and 50 ′ of the connector 40 through the connector extensions 52 and 52 ′. 51) (51') is exposed upwardly on both left and right sides of the coupling recess 11, and front and rear coil fixing portions for fixing the coils 25 to both front and rear ends of the core cap 30, respectively ( 31) It is made of a structure in which (32) is formed opposite to each other;
When assembling the core 20, which fixes both ends 25a and 25b of the coil to the front and rear coil fixing parts 31a and 32b, into the coupling recess 11, the core cap 30 The connector connection end (51, 51') between the front coil fixing part 31 and the rear coil fixing part 32 is located in the space between the pre-coil fixing part 31 and the rear coil fixing part 32. It is configured to protrude to a height contacting both ends 25a and 25b, so that the portion where both ends of the coil 25a and 25b and the connector connection ends 51 and 51 ′ abut to be opened at the top to facilitate soldering access. Done,
A low-frequency antenna for a vehicle smart key, characterized in that at least one of the front and rear coil fixing portions 31 and 32 has front and rear coil fixing grooves 31a and 32b for winding and fixing the coil.
A core 20 in which a connector 40 for wiring connection of a low-frequency antenna for a smart key is formed integrally with a case 10 for an external configuration of the smart key antenna, and a coil 25 is wound inside the case 10 The coupling recesses 11 for assembling by inserting are formed, and the core cap 30 is coupled to one end (A) of the core 20 where both ends (25a) (25b) of the coil (25) are located. In the low-frequency antenna for the smart key of the vehicle;
Connector connection ends for soldering connection with both ends 25a and 25b of the coil by being electrically connected from the connection terminals 50 and 50 ′ of the connector 40 through the connector extensions 52 and 52 ′. 51) (51') is exposed upwardly on both left and right sides of the coupling recess 11, and front and rear coil fixing portions for fixing the coils 25 to both front and rear ends of the core cap 30, respectively ( 31) It is made of a structure in which (32) is formed opposite to each other;
When both ends (25a) (25b) of the coil are fixed to the front and rear coil fixing parts (31a) (32b) to insert and assemble the core (20) into the coupling recess (11), the front of both sides of the core cap (30) Between the coil fixing part 31 and the rear coil fixing part 32, the connector connection end 51 and 51 ′ is the amount of the coil in the space between the pre-coil fixing part 31 and the rear coil fixing part 32. It is configured to protrude to a height that abuts the ends 25a and 25b, so that the portions where the coil ends 25a and 25b and the connector connection ends 51 and 51 ′ contact each other are opened at the top to facilitate soldering access. under,
The connector connection ends 51 and 51 ′ are formed with bent concave portions 51a and 51b of semicircular grooves, and are positioned between the coil fixing portions 31 and 32 before and after the core cap 30 A low-frequency antenna for a vehicle smart key, characterized in that the coil ends 25a and 25b are inserted into the bent concave portions 51a and 51b to align the soldering position.
The method of claim 2,
A seating protrusion (15a) having a concave portion (15a) (15a) facing the lower portion of the bent concave portion (51a) (51b) at a lower position of the connector connection end (51) (51') on the coupling recess (11) of the case ( 15) (15'), characterized in that the structure to seat and support the connector connection end (51) (51'), a low-frequency antenna for a vehicle smart key.
A core 20 in which a connector 40 for wiring connection of a low-frequency antenna for a smart key is formed integrally with a case 10 for an external configuration of the smart key antenna, and a coil 25 is wound inside the case 10 The coupling recesses 11 for assembling by inserting are formed, and the core cap 30 is coupled to one end (A) of the core 20 where both ends (25a) (25b) of the coil (25) are located. In the low-frequency antenna for the smart key of the vehicle;
Connector connection ends for soldering connection with both ends 25a and 25b of the coil by being electrically connected from the connection terminals 50 and 50 ′ of the connector 40 through the connector extensions 52 and 52 ′. 51) (51') is exposed upwardly on both left and right sides of the coupling recess 11, and front and rear coil fixing portions for fixing the coils 25 to both front and rear ends of the core cap 30, respectively ( 31) It is made of a structure in which (32) is formed opposite to each other;
When assembling the core 20, which fixes both ends 25a and 25b of the coil to the front and rear coil fixing parts 31a and 32b, into the coupling recess 11, the core cap 30 The connector connection end (51, 51') between the front coil fixing part 31 and the rear coil fixing part 32 is located in the space between the pre-coil fixing part 31 and the rear coil fixing part 32. It is configured to protrude to a height contacting both ends 25a and 25b, so that the portion where both ends of the coil 25a and 25b and the connector connection ends 51 and 51 ′ abut to be opened at the top to facilitate soldering access. Done,
The coil 25 is wound on the core 20 in the longitudinal direction of the core, wound by a set number of turns, and then returned, so that the ends 25a and 25b of the coil are fixed to the coil fixing parts 31 and 32 A low-frequency antenna for an automobile smart key, characterized in that the length of the antenna coil corresponding to the used frequency is assumed as a length soldered to the connector connection ends 51 and 51 ′ in a state fixed to the connector.
The method according to any one of claims 1 to 4,
Connector extensions 52 and 52 ′ electrically connecting the connector connection ends 51 and 51 ′ to the connection terminals 50 and 50 ′ of the connector 40 are inserted into the case 10. Low-frequency antenna for a car smart key, characterized in that the molded structure.
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