JP2015228635A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device for remote-controlling to lock/unlock a door capable of reducing the thickness dimension.SOLUTION: An antenna device 100 includes an antenna part 21 which is constituted of a coil 32 wound on a magnetic core 31 and disposed on a wiring board 22. The magnetic core 31 of the antenna part 21 is disposed being inserted into a through hole 22A between two linear parts 22B formed in the wiring board 22. The coil 32 is wound including the outer position of the two linear parts 22B. With this, the antenna device 100 can be reduced in thickness dimension.

Description

  The present invention relates to an antenna device that is mounted in a door handle of a vehicle, a house, or the like, and performs locking and unlocking of the door by remote control.

  In recent years, an antenna device that is mounted in a door handle of a vehicle, a house, or the like and that remotely locks and unlocks the door through communication with a portable device owned by an operator is increasing.

  Patent Document 1 discloses an antenna device in which a magnetic core is placed on a substrate surface of a wiring board, and an insulating coating copper wire is wound around the wiring board and the outer periphery of the magnetic core that are arranged to overlap each other. It is shown.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2005-101710 A

  However, the conventional antenna device has a configuration in which an insulation-coated copper wire is wound around the outer periphery of the wiring board and the magnetic core arranged in an overlapping manner, and thus there is a problem that the thickness dimension in the direction in which the both overlap is increased. .

  The present invention solves such a conventional problem, and an object of the present invention is to provide an antenna device having a reduced thickness.

  In order to achieve the above object, an antenna device according to the present invention includes an antenna unit that is disposed on a wiring board and is configured by winding a coil around a magnetic core, and the magnetic core of the antenna unit is provided on the wiring board. The magnetic material is inserted into the magnetic material insertion portion.

  If this is the case, a part of the thickness of the magnetic core can be absorbed by the thickness of the wiring board, and an antenna device having a reduced thickness can be obtained.

  According to the present invention, it is possible to obtain an advantageous effect that an antenna device having a reduced thickness can be obtained.

Sectional drawing of the antenna apparatus by embodiment of this invention Same perspective view Exploded perspective view External perspective view of the antenna device molded with resin The figure which shows the state which has distribute | arranged the antenna apparatus by FIG. 4 to the handle base of a door handle External appearance perspective view of an antenna device according to another embodiment of the present invention. External appearance perspective view of an antenna device according to another embodiment of the present invention. The exploded perspective view of the antenna device by other embodiments of the present invention.

(Embodiment)
An antenna device according to an embodiment of the present invention will be described below with reference to the drawings.

  1 is a sectional view of an antenna device 100 according to an embodiment of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is an exploded perspective view of the same.

  The antenna device 100 includes an antenna unit 21, a wiring board 22 provided with a through hole 22A, an electronic circuit unit 23, a switch 24, a spacer 25, an unlock sensor 26, and a cable 27.

  The antenna unit 21 includes a magnetic core 31 and a coil 32. The magnetic core 31 is formed in a rectangular parallelepiped shape using a soft magnetic material such as soft ferrite, iron, or permalloy. The coil 32 is made of a coated metal wire such as a polyurethane copper wire having a diameter of 0.1 mm to 0.7 mm, for example.

  The wiring board 22 is made of a rigid material such as a glass epoxy board or a paper phenol board, and has, for example, a printed wiring board. The plate thickness is 1.0 mm to 1.6 mm.

  As shown in FIG. 3, the outer shape of the wiring board 22 is an elongated rectangular shape, and a rectangular through hole 22 </ b> A capable of accommodating the magnetic core 31 is provided at a substantially central position on the short side. In other words, the wiring board 22 has two linear portions 22B that form part of the outer frame, and the position between the linear portions 22B is a through hole 22A in which the magnetic core 31 is inserted and arranged. . The two linear portions 22 </ b> B are formed to have the same width extending along the longitudinal direction of the wiring substrate 22.

  The width dimension of the linear portion 22B is preferably 1.5 mm to 2.0 mm in consideration of workability and the like. For example, if the value is slightly larger than the thickness of the wiring board 22, the workability is excellent. The linear portion 22B is provided with a printed wiring (not shown). This printed wiring is arranged to connect the electronic circuit portion 23 and the switch 24. If the width of the linear portion 22B is set as described above, the printed wiring is easily formed into the linear portion 22B having the printed wiring. it can.

  The wiring board 22 is provided with two holes 22C for fixing the spacer 25 (see FIG. 3).

  As shown in FIG. 1, the magnetic core 31 is inserted and disposed in the through hole 22 </ b> A. As shown in FIG. 2, the coil wire of the coil 32 is wound in a range including the outer positions of the two linear portions 22B. That is, the coil 32 is wound around the outer periphery of the one linear portion 22B, the magnetic core 31 in the through hole 22A, and the other linear portion 22B in this order.

  Here, the through hole 22A has a rectangular shape as shown in FIG. The short dimension of the through-hole 22A is set to be slightly larger than the corresponding short dimension of the magnetic core 31, and the dimensional difference is large. On the other hand, the longitudinal dimension of the through hole 22 </ b> A is set to be smaller than the corresponding longitudinal dimension of the magnetic core 31 with respect to the dimension difference on the short side. That is, the dimensional difference between the magnetic core 31 and the through hole 22A of the wiring board 22 is greater than the dimensional difference in the direction along the coil wire circumferential direction (that is, the short side of the wiring board 22) in the coil 32. The through-hole 22A is provided in such a manner that the dimensional difference in the direction orthogonal to the winding direction of the coil wire (that is, the longitudinal direction side of the wiring board 22) becomes small. Preferably, the magnetic core 31 may be set in a dimensional relationship in which only the longitudinal direction is inserted in a press-fit manner.

  The thickness of the magnetic core 31 is thicker than the thickness of the wiring substrate 22, and the magnetic core 31 protrudes from the front and back substrate surfaces of the wiring substrate 22 as shown in FIG. 1. The amount of protrusion to the front and back sides is the same. With this configuration, a part of the thickness of the magnetic core 31 can be absorbed by the thickness of the wiring substrate 22, and the thickness of the antenna device 100 can be reduced.

  The coil 32 is wound around a central position in the longitudinal direction of the magnetic core 31. In other words, the coil 32 is not wound on both ends of the magnetic core 31 in the longitudinal direction, and both ends of the magnetic core 31 protrude outward along the longitudinal direction from the winding portion of the coil 32. ing. If the coil 32 is wound only around the central portion of the magnetic core 31 as described above, for example, the coil 32 may be wound while holding both ends of the magnetic core 31 by equipment during assembly. it can. Further, after winding, the magnetic core 31 can be held by the coil 32.

  If the magnetic core 31 is in the press-fit state on the long side of the through-hole 22A when the magnetic core 31 is inserted into the through-hole 22A, the coil 32 can be formed only by holding the wiring board 22. The magnetic core 31 can be easily wound around the central portion. The same applies to the case where the magnetic core 31 is fixed to the wiring board 22 with an adhesive or the like.

  The magnetic core 31 protrudes from the front and back substrate surfaces of the wiring board 22 with the same dimensions, and as the wiring board 22, the linear portion 22B has the same width dimension, and the through hole 22A is on the short side of the wiring board 22. When the coil 32 is wound, the tension of the coil wire is uniformly applied to the magnetic core 31 after the coil 32 is wound, and the inadvertent movement of the magnetic core 31 is suppressed.

  That is, with the setting described above, the coil wire of the coil 32 is wound between the magnetic core 31 and the linear portion 22B in an inclined shape that narrows the linear portion 22B side. That is, at the location, the coil wire is wound around the substrate surface of the wiring substrate 22 and the side surface on the short side of the magnetic core 31 so as to form a hollow triangular prism space. The triangular prism-shaped space portion is configured to have the same symmetrical shape on the front and back sides of the substrate surface and the same symmetrical shape with respect to the short side direction of the magnetic core 31. It can be configured such that the tension of the wire is uniformly applied to the magnetic core 31. In addition, when using in the state which is not molded with the resin 90 mentioned later, since the area which touches the air increases in the location wound by the inclination of the coil 32, the incidental effect that the heat dissipation effect | action of the coil 32 increases is produced. It can also be obtained.

  The end of the coil wire of the coil 32 is fixed to a binding protrusion 22 </ b> D provided on the wiring board 22. The binding protrusion 22 </ b> D protrudes in the short direction of the wiring board 22. And although illustration is abbreviate | omitted, the printed wiring which connects the electronic circuit part 23 and the edge part of a coil wire is also formed in the binding protrusion 22D.

  In this configuration, since the wiring board 22 is made of a rigid material, the coil 32 can be wound including the outer positions of the two linear portions 22B, and the winding protrusion 22D is also integrated. And can be configured.

  An electronic circuit unit 23 is disposed at one end position on the longitudinal side of the wiring board 22. The electronic circuit unit 23 is composed of an IC (Integrated Circuit), a semiconductor component such as a diode, and a chip component such as a resistor, a capacitor, and a coil, each of which is mounted on the wiring board 22. A switch 24 is mounted at the end position of the other end on the longitudinal side of the wiring board 22.

  The switch 24 is a push operation type single switch, and an operation member 24A made of rubber or the like is disposed thereon. As described above, the switch 24 is connected to the electronic circuit unit 23 via a printed wiring formed in the linear portion 22B.

  As described above, the electronic circuit portion 23, the antenna portion 21, and the switch 24 are sequentially disposed on the wiring board 22 from one end to the other end in the longitudinal direction.

  A spacer 25 is mounted on the back surface of the wiring board 22. The spacer 25 is a thin plate made of an insulating resin or the like. The spacer 25 is provided with two columnar protrusions 25 </ b> A, and each protrusion 25 </ b> A is inserted and held in the corresponding hole 22 </ b> C of the wiring board 22, and the spacer 25 is integrated on the back side of the wiring board 22. .

  In addition, about the spacer 25, what provided the escape part 25B (refer FIG. 1) is used in the opposing surface side with the wiring board 22 according to the arrangement | positioning location of the antenna part 21. FIG. In other words, the magnetic core 31 protruding from the substrate surface on the back surface of the wiring substrate 22 and the coil 32 disposed on the outer periphery thereof are accommodated in the escape portion 25B, and an excessive load is not applied to the coil 32 and the like. Yes.

  An unlock sensor 26 is disposed on the back side of the spacer 25.

  The unlock sensor 26 includes an electrode 51 and an electrode 52. The material of the electrodes 51 and 52 is, for example, a metal having a thickness of, for example, 0.1 mm to 0.4 mm, a metal thin plate such as steel or copper alloy, or a metal plated with nickel or tin plating on steel or copper alloy. It consists of a thin plate.

  The electrode 51 is configured by a ring-shaped plane having a rectangular outer shape, and an electrode 52 configured by a rectangular ring-shaped plane is disposed on the same plane that is inside the electrode 51.

  The electronic circuit unit 23 is connected to the switch 24 as described above, and is also connected to the electrodes 51 and 52 of the unlock sensor 26 via the printed wiring of the wiring board 22.

  Then, the electronic circuit unit 23 determines that the operator has pressed the switch 24. Further, when the electronic circuit unit 23 reaches the vicinity of the unlock sensor 26, the electronic circuit unit 23 approaches the unlock sensor 26 with a finger or the like due to a change in capacitance between the electrode 51 and the electrode 52 of the unlock sensor 26. And a function of outputting a predetermined output corresponding to the detected signal.

  The electrodes 51 and 52 of the unlock sensor 26 can be easily formed by punching a metal thin plate in a predetermined shape and performing a bending process or the like, but may also be formed by etching a printed circuit board. Good.

  The cable 27 includes a connector portion 27A and a lead wire 27B. The connector portion 27A is disposed at an end position on one end side of the wiring board 22, and in this state, the lead wire 27B is connected to the electronic circuit portion 23 and the antenna portion 21 via the printed wiring of the wiring substrate 22.

  When the electronic circuit unit 23 determines the pressing operation state of the switch 24 or the proximity of a hand or the like to the unlock sensor 26, the external control of the antenna device 100 is performed through the lead wire 27B of the cable 27. A predetermined signal is transmitted to a device (not shown). The lead wire 27B of the cable 27 transmits a signal from the control device, for example, a request signal to be transmitted via the antenna unit 21.

  As described above, the antenna device 100 is configured. The antenna device 100 can be configured and used as an antenna device 200 in which the exterior is entirely molded with an insulating resin 90 except for the upper surface position of the operation member 24A, as shown in FIG. 4, for example. . If the outside of the antenna unit 21 is molded with the resin 90, the integrated state of the antenna unit 21 and the wiring board 22 can be easily improved. At this time, the triangular column-shaped space formed by the coil wire of the coil 32, the substrate surface of the wiring substrate 22, and the side surface of the magnetic core 31 on the short side is used as a flow path through which the resin 90 flows. It becomes.

  As shown in FIG. 5, the antenna device 200 is disposed and mounted on a handle base 211 of a door handle of a vehicle, for example.

  The door handle includes a handle base 211 and a handle cover (not shown) coupled to the handle base 211 so as to cover the handle base 211. As the handle cover, a handle cover provided with an operation button at a location corresponding to the switch 24 is used.

  The door handle 211 is attached to the vehicle such that the handle base 211 is movable to the operator side with the front mounting portion 211A serving as a fulcrum with respect to the vehicle door (not shown). At this time, the lead wire 27B of the cable 27 is pulled into the door through the front mounting portion 211A side.

  Here, since the antenna device 200 has a structure molded with the resin 90, the antenna device 200 has excellent handleability and can be easily assembled. And since the antenna device 200 has a configuration in which the magnetic core 31 of the antenna unit 21 is inserted into the through hole 22A of the wiring board 22, the antenna device 200 can be configured to be thin even when molded with the resin 90. The occupied volume is small. For this reason, it is possible to increase the degree of freedom in setting the shape of the door handle, or to contribute to reducing the size and weight of the door handle.

  Next, the operation of the antenna device 200 will be described.

  When an operator who has a portable device inserts his hand inside the door handle, that is, between the outer surface of the vehicle door and the handle base 211, the electronic circuit unit 23 detects a change in the capacitance of the unlock sensor 26. Then, a predetermined signal is transmitted through the cable 27 to the control device arranged inside the vehicle. Upon receiving the signal, the control device transmits a request signal having a predetermined frequency via the cable 27, the antenna unit 21, and the like.

  When the portable device receives the request signal, the portable device transmits a response signal to the vehicle.

  When the control device on the vehicle side receives a response signal via a receiving antenna (not shown), the response signal is confirmed and the door is unlocked.

  Further, when the operator carrying the portable device leaves the vehicle, the operator pushes the operation button on the door handle and performs a pressing operation on the switch 24 via the operation member 24A. A pressing operation state of the switch 24 is determined by the electronic circuit unit 23, and a predetermined signal corresponding to the pressed operation state is transmitted to the control device arranged inside the vehicle via the cable 27, and the control device locks the door.

  As described above, the antenna device 100 according to the present embodiment or the antenna device 200 configured by molding the antenna device 100 is arranged by inserting the magnetic core 31 of the antenna section 21 into the magnetic body insertion section of the wiring board 22. The main structural idea is that the configuration is made thin. Here, in the antenna devices 100 and 200, the through hole 22A is shown as an example of the magnetic body insertion portion.

  Note that the antenna devices 100 and 200 according to the present embodiment have various modifications. For example, the electronic circuit unit 23 may be arranged in a control device inside the vehicle.

  The electronic circuit unit 23 may not be provided in the antenna devices 100 and 200, and the pressing operation of the switch 24 may be determined by a control device outside the antenna devices 100 and 200.

  Further, the spacer 25 between the unlock sensor 26 and the wiring board 22 is not necessarily provided, and the unlock sensor 26 may be in contact with the wiring board 22.

  The unlock sensor 26 may have various shapes as long as it can detect a change in capacitance. For example, in the unlock sensor 26 described above, the configuration using the two electrodes 51 and 52 has been described. However, the present invention is not limited to this, and the number of electrodes may be any number including one. However, in the case of a configuration with a plurality of electrodes, it is possible to detect a change in capacitance for each electrode, so that it is possible to accurately separate contact detection with a finger and detection with raindrops.

  In the above description, the switch 24 is directly arranged on the wiring board 22. However, as shown in the antenna device 300 in FIG. 6, a switch block body having a pressing operation type single switch and an operation member 24A. 310 may be manufactured and a long terminal portion 311 connected to a single switch may be connected to the wiring board 22.

  Alternatively, the lock sensor 410 may be provided on the wiring board 22 as shown in the antenna device 400 of FIG. In this case, the electronic circuit unit 23 may detect a change in the capacitance of the lock sensor 410 due to the proximity of a hand or the like. As with the unlock sensor 26, the lock sensor 410 can be easily formed if it is formed from a thin metal plate, and if it is of that configuration, the degree of freedom in the arrangement position is easy to spread, but the material and shape are preferred. There is no particular limitation.

  Further, as shown in the antenna device 500 of FIG. 8, the magnetic body insertion portion may be configured as a notch 422A provided in the wiring board 422 instead of the through hole 22A. As described above, the magnetic body insertion portion may have a shape in which the magnetic core 31 can be inserted.

  In the antenna device 500, since the coil wire of the coil 32 is directly wound around the side surface of the magnetic core 31 corresponding to the opening side of the notch 422A, an effect of improving the antenna characteristics can be obtained.

  In addition, it is preferable that the antenna devices 300, 400, and 500 described above have a configuration in which the outside is molded with the resin 90.

  The antenna devices 100, 200, 300, 400, and 500 described above can be applied to all devices having a door handle, in addition to being used for a vehicle. For example, it is good to use for the door locking / unlocking for houses as the representative.

  The antenna device according to the present invention can be configured to have a reduced thickness, and is useful for locking and unlocking doors of vehicles and houses.

21 Antenna part 22, 422 Wiring board 22A Through hole 22B Linear part 22C Hole part 22D Tying protrusion 23 Electronic circuit part 24 Switch 24A Operation member 25 Spacer 25A Protrusion 25B Escape part 26 Unlock sensor 27 Cable 27A Connector part 27B Lead wire 31 Magnetic core 32 Coil 51, 52 Electrode 90 Resin 100, 200, 300, 400, 500 Antenna device 211 Handle base 211A Front mounting portion 211B Rear mounting portion 310 Switch block body 311 Terminal portion 410 Lock sensor 422A Notch

Claims (8)

A wiring board, an antenna unit arranged on the wiring board and having a coil wound around a magnetic core, and a cable fixed to the wiring board,
An antenna device in which the magnetic core of the antenna section is inserted and disposed in a magnetic body insertion section provided on the wiring board. The antenna device according to claim 1, wherein the magnetic body insertion portion is configured by a through hole or a notch. The antenna device according to claim 1, wherein a thickness dimension of the magnetic core is larger than a thickness dimension of the wiring board. The coil is wound around the central portion of the magnetic core, and the magnetic core has both ends in a direction perpendicular to the winding direction of the coil wire in the coil outward from the winding portion of the coil. The antenna device according to claim 1, which protrudes. The antenna device according to claim 1, further comprising at least one of an unlock sensor, a switch, and a lock sensor. The antenna device according to claim 1, wherein the outside of the antenna portion is molded with resin. The magnetic body insertion portion is a through hole, the wiring board has two linear portions, and the position between the linear portions is the through hole in which the magnetic core is inserted and arranged. The antenna device according to claim 1, wherein the coil is wound including an outer position of the two linear portions. The magnetic body insertion portion is a through hole, and the dimensional difference between the magnetic body core and the through hole of the wiring board is larger than the dimensional difference in the direction along the winding direction of the coil wire in the coil. The antenna device according to claim 1, wherein a dimensional difference in a direction orthogonal to the circumferential direction is set to be small.

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