JP4239721B2 - Antenna device and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to an antenna device used in a keyless entry system that remotely controls locking / unlocking of a vehicle door and a manufacturing method thereof.
[0002]
[Prior art]
In recent years, as keyless entry systems that remotely control the locking and unlocking of vehicle doors have become widespread, antenna devices used for transmitting and receiving radio waves are also required to be small and can be reliably transmitted and received on vehicles. It has been.
[0003]
Such a conventional antenna device will be described with reference to FIG.
[0004]
FIG. 5 is a cross-sectional view of a conventional antenna device. In FIG. 5, reference numeral 1 denotes an antenna, which is a magnetic body 2 such as ferrite, a hollow bobbin 3 made of a dielectric resin that covers the magnetic body 2, and wound around the outer periphery of the bobbin 3. It is comprised from the coil 4 of the linear conductor made.
[0005]
Reference numeral 5 denotes a wiring board in which a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces. The antenna 1 is placed on the wiring board 5, and both ends of the coil 4 are formed into wiring patterns by soldering or the like. It is connected.
[0006]
In addition, electronic components 6 such as capacitors 6A and resistors 6B are mounted on the wiring board 5, and these electronic components 6 and the coil 4 are connected by a wiring pattern to form a series resonance circuit. Connected to the connector 7.
[0007]
Further, a sealant (not shown) such as silicon is applied to the entire surface of the wiring board 5 except for the connector 7 to cover the antenna 1 and the electronic component 6, and the wiring board 5 is made of an insulating resin. The antenna device is configured by being housed in the cover 8 and the cover 9 covering the lower surface of the case 8.
[0008]
In the antenna device configured as described above, the connector 7 is electrically connected to an electronic circuit (not shown) in the vehicle, and the case 8 is mounted on the door or mirror of the vehicle so that the keyless entry system is provided. It is formed.
[0009]
In the above configuration, when the driver carrying the mobile card approaches the vehicle or when a radio wave is transmitted from the mobile device, the antenna device receives this and the electronic circuit performs verification of the unique authentication code, and the door Was unlocked and unlocked.
[0010]
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
[0011]
[Patent Document 1]
JP 2001-345615 A
[Problems to be solved by the invention]
However, in the above conventional antenna device, the antenna 1 and the electronic component 6 are connected to the wiring board 5 and covered with the case 8 and the cover 9, so that the number of components is large and the shape is somewhat large. There was a problem of becoming.
[0013]
An object of the present invention is to solve such a conventional problem, and to provide an antenna device that can be easily downsized with a simple configuration with a small number of parts used, and a method for manufacturing the antenna device.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
[0015]
The invention according to claim 1 of the present invention includes an antenna in which a coil is wound around a magnetic body, a plurality of conductive pieces made of a metal plate, and an insulating resin case that covers the antenna and the conductive pieces by insert molding. becomes, the holding portion for holding and fixing the antenna to one of the conductive strips provided, the electronic component exposed from the case provided with an electrode portion connected to one end of the other conductive strips, the electrons and the other end A connecting portion that protrudes into the case connecting the component and the external terminal is provided, and the coil and the electronic component are connected by the plurality of conductive pieces, and the wiring board and the case that connect the antenna and the electronic component are covered. Since a cover or the like is not required and the structure can be connected to an electronic component in the vehicle, the number of components used can be reduced and the configuration can be simplified, and an antenna device that can be easily miniaturized can be obtained. It is having an effect.
[0016]
According to the second aspect of the present invention, a plurality of conductive pieces are formed in a band-shaped metal plate hoop member, an antenna is fixed to a holding portion of the conductive piece, a case is insert-molded, and the conductive piece ends are cut. Then, after separating from the hoop member, an electronic component is connected to the electrode portion, and a sealing agent is filled in the recess of the case to manufacture the antenna device according to claim 1, and the number of components used is small. An antenna device that can be easily downsized with a simple configuration can be realized.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0018]
In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.
[0019]
(Embodiment)
FIG. 1 is a cross-sectional view of an antenna device according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes an antenna, and a magnetic body 12 such as ferrite and a heat resistant resin such as polyimide wound around the outer periphery. It comprises a coil 14 such as a coated copper wire.
[0020]
Further, 15 to 20 are plate-like plural conductive pieces such as copper alloy, 25 is a case made of a heat resistant resin such as liquid crystal polymer or polybutylene terephthalate, and the antenna 11 and the conductive pieces 15 to 20 are included in the case 25. It is covered with insert molding.
[0021]
And among these conductive pieces 15-20, as shown to the principal part perspective view of Fig.2 (a), as shown in the principal part perspective view of FIG. 16A is provided, and both ends of the antenna 11 are held by the holding portions 15A and 16A.
[0022]
One end of the coil 14 of the antenna 11 is fixedly connected to one end of the conductive piece 17 by high-temperature soldering or caulking, and an electrode portion 17A exposed to the bottom surface of the recess 25A of the case 25 is formed on the other end. The right end of the resistor 6B is mounted on and connected to this electrode portion 17A by cream solder or the like.
[0023]
Further, an electrode portion 18A that is exposed on the bottom surface of the recess 25A is formed at one end of the conductive piece 18, and the left end of the resistor 6B is mounted on the electrode portion 18A and the other end is mounted on the other end. Is provided with a connecting portion 18B that protrudes into the cylindrical portion 25B of the case 25.
[0024]
Conductive pieces 19 and 20 are disposed below the conductive pieces 17 and 18, the other end of the coil 14 is disposed at one end of the conductive piece 19, and the electrode portion 19 </ b> A at the other end of the conductive piece 19 is disposed. The right end of the capacitor 6A is similarly connected, the left end of the capacitor 6A is connected to the electrode portion 20A at one end of the conductive piece 20, and the connection portion 20B at the other end protrudes into the cylindrical portion 25B.
[0025]
That is, as shown in the circuit diagram of FIG. 4, one end of the coil 14 and the resistor 6B are connected to the conductive piece 17, and the other end of the coil 14 and the capacitor 6A are connected to the conductive piece 19 to form a series resonance circuit. The antenna device is configured.
[0026]
The conductive pieces 17 to 20 on which the electronic components 6 such as the capacitor 6A and the resistor 6B are mounted are plated with tin or the like.
[0027]
Next, a method for manufacturing the antenna device configured as described above will be described with reference to FIGS.
[0028]
First, as shown in FIG. 2 (a), a plurality of strips 22A, 22B, and 22C having ends connected to a hoop member 22 made of copper alloy or the like in a strip shape plated with tin or the like in the left half. The conductive pieces 15 to 20 are formed by punching and bending.
[0029]
As shown in FIG. 2B, both ends of the antenna 11 are held and fixed to the holding portions 15A and 16A of the conductive pieces 15 and 16 formed as a pair of left and right, and both ends of the coil 14 of the antenna 11 are fixed. The conductive pieces 17 and 19 are wound around one end and fixedly connected by high temperature soldering or caulking.
[0030]
Thereafter, as shown in FIG. 3C, the heat-resistant resin case 25 provided with the recess 25 </ b> A and the cylindrical portion 25 </ b> B so as to cover the antenna 11 and the conductive pieces 15 to 20 is attached to the hoop member 22. Insert molding.
[0031]
Next, after the ends of the conductive pieces 15 to 20 protruding from the outer periphery of the case 25 are cut from the crosspieces 22A, 22B, and 22C and separated from the hoop member 22, as shown in FIG. The resistor 6B is exposed on the electrode portion 17A and the electrode portion 18A, the capacitor 6A is exposed on the electrode portion 19A and the electrode portion 20A, and cream solder is spot reflowed by hot air spraying or laser irradiation. Each mounted and connected.
[0032]
Finally, a sealant (not shown) such as silicon is filled in the recess 25A of the case 25, and the electronic component 6 such as the capacitor 6A and the resistor 6B is covered to complete the antenna device.
[0033]
In the antenna device configured as described above, the connecting portions 18B and 20B protruding into the cylindrical portion 25B of the case 25 are electrically connected to electronic components (not shown) in the vehicle, and the case 25 Is attached to the vehicle door and mirror to form a keyless entry system.
[0034]
In the above configuration, when the driver carrying the mobile card approaches the vehicle or when a radio wave is transmitted from the mobile device, the antenna device receives this and the electronic circuit performs verification of the unique authentication code, and the door Is configured to be locked and unlocked.
[0035]
Thus, according to the present embodiment, the antenna 11 and the plurality of conductive pieces 15 to 20 are covered with the case 25 by insert molding, the antenna 11 is held by the holding portions 15A and 16A of the conductive pieces 15 and 16, and the conductive The electronic component 6 is connected to the electrode portions 17A to 20A of the pieces 17 to 20, the coil 14 of the antenna 11 and the electronic component 6 are connected by the plurality of conductive pieces, and the connection portions 18B and 20B are provided at the ends of the conductive pieces. Te by configuring the antenna device, the antenna 11 and Ri electronic component 6 Do not necessary cover for covering the circuit board and case to be connected to, to get a connectable structure to an electronic component in the vehicle, the number of used parts It is possible to obtain an antenna device and a method for manufacturing the antenna device that have a small and simple configuration and can be easily downsized.
[0036]
In addition, by fixing the both ends of the coil 14 of the antenna 11 and the conductive pieces 17 and 19 by high-temperature soldering or caulking, insert molding by the case 25 made of a heat-resistant resin becomes possible, and the capacitor 6A and the resistor 6B. By performing the mounting by hot air spraying or laser irradiation, it is possible to prevent deformation of the case 25 due to heat during reflow.
[0037]
【The invention's effect】
According to the present invention as described above, it is possible to obtain an advantageous effect that an antenna device that can be easily miniaturized and a manufacturing method thereof can be realized with a simple configuration with a small number of components.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an antenna device according to an embodiment of the present invention. FIG. 2 is a perspective view of the main part. FIG. 3 is a perspective view of the main part. Sectional view of [Figure]
6 Electronic component 6A Capacitor 6B Resistor 11 Antenna 12 Magnetic body 14 Coils 15, 16, 17, 18, 19, 20 Conductive pieces 15A, 16A Holding portions 17A, 18A, 19A, 20A Electrode portions 18B, 20B Connection portion 22 Hoop member 22A, 22B, 22C Crosspiece 25 Case 25A Recess 25B Tube

Claims (2)

An antenna in which a coil is wound around a magnetic body, a plurality of conductive pieces made of a metal plate, and a case made of an insulating resin that covers the antenna and the conductive pieces by insert molding, and the antenna is attached to one of the conductive pieces A holding portion for holding and fixing is provided, and an electrode portion that is exposed from the case and connected to the electronic component is provided at one end of the other conductive piece, and the other end protrudes into the case that connects the electronic component and the external terminal. An antenna device provided with a connecting portion for connecting the coil and the electronic component by the plurality of conductive pieces.   After forming a plurality of conductive pieces on a band-shaped metal plate hoop member, fixing the antenna to the holding portion of the conductive piece, insert-molding the case, cutting the conductive piece end portion and separating from the hoop member The method of manufacturing an antenna device according to claim 1, wherein an electronic component is connected to an electrode portion provided in the recess of the case, and a sealant is filled in the recess of the case.

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