JP2008244621A - Antenna unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna unit for easily assembling an antenna and a relay board. <P>SOLUTION: The antenna unit has a feed pin 46 for connecting feeding parts of antennas 42, 43, and a coaxial connector 47 connected with a coaxial cable (7), and comprises: the relay board 45 for relaying connection of the antennas 42, 43 and the coaxial cable (7); and a resin antenna 40 for integrally moulding the antennas 42, 43, the feeding parts of the antennas 42, 43 connected with the relay board 45, and fixing ribs 441, 442, 443 for fixing by sliding the relay board 45. Further, the plurality of fixing ribs 441, 442 are provided with spaces along both sides in a slide direction of the relay board 45 with respect to the resin antenna 40. Furthermore, the feeding part of the resin antenna 40 is provided in a recess 444 formed for connecting the feed pin 46 of the relay board 45. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna device.

  In recent years, the trend of mobile phones has been thinning. In order to realize this reduction in thickness, the antenna and the substrate that feeds the antenna are arranged apart from each other, and the connection may not be made directly by connection pins or the like. In that case, a coaxial cable or the like is used for connection from the substrate that feeds the antenna to the antenna. Further, for connection between the antenna and the substrate to be fed, for example, an antenna obtained by insert-molding a sheet metal into a resin is bonded to a relay substrate, and a coaxial connector and a matching circuit are formed on the relay substrate.

  FIG. 15 shows an antenna device 10 in which a conventional sheet metal is insert-molded into a resin, 101 is an antenna electrode formed of sheet metal, 102 is a relay board, 103 is a coaxial connector, 104 is a coaxial cable, and 105 is a resin substrate. It is a material. A coaxial connector 103 and a matching circuit (not shown) are mounted on the relay substrate 102, and the relay substrate 102 is fixed to the antenna electrode 101 by crimping or soldering.

Patent Document 1 describes that a part of a housing is constituted by a dielectric resin antenna having a radiation electrode for communication and a dielectric resin. The dielectric resin antenna and the general portion of the housing are integrally formed by injection molding such as insert molding. In addition, the wiring to the radiation electrode is provided so as to expose the terminal connected to the electrode, thereby connecting the wiring.
JP 2003-158415 A

  Conventionally, a coaxial cable or the like is used for the connection from the substrate that feeds the antenna to the antenna, and the connection between the antenna and the substrate that feeds power is, for example, by bonding an antenna formed by insert molding of sheet metal into a resin and a relay substrate. However, since the coaxial connector and the matching circuit are formed on the relay substrate, the antenna performance is unstable due to the way the cables are routed.

  Further, in Patent Document 1, the wiring to the radiation electrode is provided so as to expose the terminal connected to this electrode, and the wiring is thereby connected. Therefore, the antenna performance is not good depending on how the cable is routed. It was stable.

  An object of the present invention is to provide an antenna device capable of easily assembling an antenna and a relay board.

  In order to solve the above problems, the antenna device of the invention according to claim 1 includes a power supply pin connected to the power supply portion of the antenna and a coaxial connector to which the coaxial cable is connected, and relays the connection between the antenna and the coaxial cable. And a resin antenna integrally formed with an antenna, a feeding portion of the antenna to which the relay substrate is connected, and a fixing rib that slides and fixes the relay substrate.

  According to a second aspect of the present invention, in the antenna device according to the first aspect, a plurality of the fixing ribs are provided at intervals along both sides in the sliding direction of the relay board with respect to the resin antenna. It is characterized by.

  According to a third aspect of the present invention, in the antenna device according to the first or second aspect, the feeding portion of the resin antenna is provided in a recess formed for connection of the feeding pin of the relay board. It is characterized by being.

  According to a fourth aspect of the present invention, in the antenna device according to any one of the first to third aspects, the resin antenna includes the relay substrate fixed to the resin antenna, and the fixed relay substrate. When the coaxial cable is connected, a fixing guide is provided for fixing the connected coaxial cable in a certain direction.

  According to a fifth aspect of the present invention, in the antenna device according to the fourth aspect, the fixed guide has a cable holding groove for receiving and holding the coaxial cable connected to the coaxial connector. And

  According to a sixth aspect of the present invention, in the antenna device according to any one of the first to fifth aspects, the antenna device is mounted on a mobile communication terminal.

  According to the present invention, the antenna and the relay board can be easily assembled.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
1 and 2 show a state in which a foldable mobile phone is opened as a configuration of an embodiment of a mobile communication terminal to which the present invention is applied. 1 is a first casing, and 11 and 12 are cases thereof. A member 2 is a second casing, 21 and 22 are case members, and 3 is a hinge portion. The first housing 1 and the second housing 2 are connected to each other via a hinge portion 3 so as to be rotatable.

The first housing 1 is formed by combining case members 11 and 12, and a receiver 13 and a display unit 14 are provided on the case member 12 that overlaps the second housing 2 in a folded state.
The second housing 2 is configured by combining case members 21 and 22, and the transmitter 23 and the key operation unit 24 are provided on the case member 21 that overlaps the first housing 1 in a folded state. As shown in the figure, a battery cover 25 is assembled to the other case member 22, and 26 is a speaker sound emission hole.

  FIG. 3 shows the antenna mounting portion of the case member 22, and as shown in the figure, an antenna mounting portion 27 is formed by a recess along one end portion. The case member 22 has a battery housing opening 28 formed therein, and the battery housing opening 28 is covered with the battery cover 25 that can be attached and detached.

  And it attaches to the antenna attachment part 27 in the state by which the L-shaped cross section antenna apparatus 4 was fitted. The antenna device 4 includes a resin antenna 40 in which a first antenna element 42 and a second antenna element 43 that constitute an antenna are provided on a resin base material 41, and a relay board 45 that is assembled to the resin antenna 40. The relay board 45 is provided with a corresponding coaxial connector 47 for supplying driving power to the feeding portions of the first antenna element 42 and the second antenna element 43 of the resin antenna 40.

  The antenna device 4 is disposed away from the substrate 5, that is, the battery 6 is disposed between the antenna device 4 and the substrate 5. Accordingly, the coaxial connector 47 provided in the antenna device 4 is electrically connected to the coaxial connector 52 disposed on the substrate 5 via the coaxial cable 7.

  4 is an enlarged view of the resin antenna 40 of the antenna device 4. The resin antenna 40 includes an L-shaped cross section of a resin base 41 and an antenna electrode formed on the resin base 41 in a thin film, that is, The first antenna element 42 and the second antenna element 43, and a feeding portion of the first antenna element 42 and the second antenna element 43 are configured.

  The first antenna element 42 and the second antenna element 43 are made of a single continuous band-shaped conductive member branched from the same power feeding portion, and extend along the surface on the resin base 41 having an L-shaped cross section. It is installed. Here, each of the first antenna element 42 and the second antenna element 43 is a modified monopole antenna (also referred to as a branched monopole antenna). For example, a conductive member in which an alloy of copper and nickel is plated with gold is used. Can be used.

  The resin base material 41 is made of an electrically insulating resin material having a high degree of molding freedom such as ABS resin, and has a flat surface portion 411 and outer peripheral end surfaces 412 to 415 substantially orthogonal to the flat surface portion 411. ing. On the resin base material 41, the first antenna element 42 is provided along the outer peripheral end surfaces 412 to 414 of the resin base material 41, and the second antenna element 43 is a flat portion 411 of the resin base material 41 as illustrated. By being provided along the outer peripheral end portion in FIG. 2, the entire tip is arranged in a substantially loop shape with a predetermined gap between them.

  Each of the first antenna element 42 and the second antenna element 43 is adjusted to have different lengths corresponding to the frequencies of the radio waves to be transmitted and received or to be transmitted or received. The antenna element 42 can transmit and receive radio waves in the vicinity of 800 MHz (Rx: 843 MHz to 870 MHz, Tx: 898 MHz to 925 MHz), and the second antenna element 43 can transmit and receive radio waves in the vicinity of 2 GHz (Rx: 2110 MHz to 2130 MHz, Tx: 1920 MHz to 1940 MHz). It is assumed that the length is adjusted.

  In the above, the antenna device 4 is obtained by assembling the relay substrate 45 to the resin antenna 40 made of the resin base material 41 made of a resin material having a high degree of freedom in molding. A coaxial connector 47 is mounted on the relay substrate 45 so that the coaxial cable 7 can be connected to the feeding portion of the resin antenna 40.

That is, as shown in FIGS. 4 and 5, in the resin base material 41 having an L-shaped cross section, the flat relay portion 416 orthogonal to the flat plate portion 411 is mounted on both sides when the elongated relay board 45 is slid and assembled. Three fixing ribs 441 and 442 for guiding are provided, and only one fixing rib 443 is provided at one end of the fixing rib 443 so that the leading end of the relay substrate 45 abuts. In the illustrated example, the fixing rib 441 has a wide inclined surface on the flat surface portion 416 side along the flat surface portion 411, and the fixing ribs 442 and 443 are presser portions 442a and 443a protruding inward at the upper ends. have.
A recess 444 in which the feeding portion of the antenna (the first antenna element 42 and the second antenna element 43) is located is formed at the end of the flat portion 416 opposite to the fixing rib 443.

  As shown in FIG. 5, the power supply pin 46 entering the recess 444 is mounted on one end of the elongated relay substrate 45. A coaxial connector 47 is mounted on the relay board 45 coaxially with the power supply pin 46. That is, the power supply pin 46 and the coaxial connector 47 are coaxially connected to the front and back surfaces at one end of the relay board 45. It is implemented in a connected state.

  As shown in FIG. 5A, the above-described relay substrate 45 is slid along the fixing ribs 441 and 442 and the holding portion 442a on both sides as shown in FIG. As shown in FIG. 5 (b), they are assembled by being abutted against each other, and are fixed below the presser portions 442a and 443a between the fixing ribs 441 and 442 on both sides. At this time, the feed pin 46 is connected in the recess 444 where the feed portion of the antenna (the first antenna element 42 and the second antenna element 43) is located.

  FIG. 6 shows an equivalent circuit of the substrate 5 according to the antenna device 4. As shown in the figure, the substrate 5 includes a matching circuit 51 including circuit elements 511 and 512, a coaxial connector 52, a transmission / reception circuit 53, and the like. A ground G is mounted, and a circuit element 511 is connected to the ground G. The first antenna element 42 and the second antenna element 43 of the antenna device 4 receive power matched by the matching circuit 51 via the coaxial connector 52, the coaxial cable 7, the coaxial connector 47, and the feed pin 46. It comes to be supplied.

FIG. 7 shows a spring connector 461 used for the power feed pin 46 of the relay board 45 of FIG. 5. The spring connector 461, also called a POGO pin, has a pin 463 incorporated in the main body 462 as shown in the figure. The pin 463 is always urged in the protruding direction by a spring built in the main body 462.
In the spring connector 461, the main body 462 is fixed to the relay substrate 45, and the spring connector 461 is stored in the recess 444 (see FIG. 4B) of the resin antenna 40, so that the antenna ( The pin 463 is kept in an electrically connected state with respect to the feeding portion of the first antenna element 42 and the second antenna element 43).

FIG. 8 shows a leaf spring 465 used for the power supply pin 46 of the relay board 45 in FIG. 5. The leaf spring 465, also called a so-called earth finger, has a tip 467 bent with respect to the main body 466 as shown in the figure. Is formed. The distal end portion 467 is always urged in the protruding direction by the elastic force of the leaf spring 465.
The leaf spring 465 has an antenna (with the main body 466 fixed to the relay substrate 45 and the leaf spring 465 in the recess 444 of the resin antenna 40 (see FIG. 4B)). The tip portion 467 is kept in an electrically connected state with respect to the feeding portions of the first antenna element 42 and the second antenna element 43).

  As described above, in the mobile phone, according to the antenna device 4 of the embodiment, the antenna feeding unit and the relay board 45 to which the antenna (the first antenna element 42 and the second antenna element 43) and the relay board 45 are connected are slid. A resin antenna 40 integrally formed with fixing ribs 441, 442, and 443 to be fixed, a power supply pin 46 connected to the power supply portion of the antenna, and a coaxial connector 47 to which the coaxial cable 7 is connected, and the antenna and the coaxial cable 7 Since the relay board 45 for relaying the connection is provided, the resin antenna 40 and the relay board 45 can be easily assembled without soldering.

(Embodiment 2)
FIG. 9 shows a second embodiment of the antenna device 4, and this second embodiment is a resin antenna 40 (the first antenna element 42 and the first antenna element 42) as shown in the antenna device 4 of the first embodiment described above. A matching circuit 48 is formed between the feeding portion of the two antenna elements 43) and the coaxial connector 47 of the relay board 45. That is, on the surface of the relay substrate 45 on which the coaxial connector 47 is provided on the resin antenna 40, a matching circuit is provided between the feeding portions of the first antenna element 42 and the second antenna element 43 constituting the resin antenna 40 and the coaxial connector 47. 48 is formed. The matching circuit 48 is formed in a loop pattern as shown in the figure.

  FIG. 10 shows an equivalent circuit of the pattern of the matching circuit 48 of the antenna device 4. As shown in the figure, the antenna device 4 is mounted with a circuit element 481 by the pattern electrode of the matching circuit 48. Element 481 is connected to ground G. The first antenna element 42 and the second antenna element 43 have power matched by the matching circuit 48 via the transmission / reception circuit 53 of the substrate 5, the coaxial connector 52, the coaxial cable 7, the coaxial connector 47 of the antenna device 4, and the feed pin 46. Is supplied via a power feeding unit.

  As described above, the matching circuit 48 is mounted on the relay board 45 that has the power supply pin 46 connected to the power supply portion of the antenna and the coaxial connector 47 to which the coaxial cable 7 is connected and relays the connection between the antenna and the coaxial cable 7. Therefore, the matching circuit 51 (see FIG. 6) formed on the substrate 5 as in the first embodiment described above becomes unnecessary, and the number of parts is reduced. Further, the resin antenna 40 and the relay substrate 45 on which the matching circuit 48 is mounted can be easily assembled without soldering.

(Embodiment 3)
FIG. 11 and FIG. 12 show Embodiment 3 of the antenna device 4, and a fixing guide 446 for fixing the coaxial cable 7 in a fixed direction is formed at the same time by utilizing the characteristics of a resin antenna having a high degree of freedom in forming.

  That is, the fixing guide 446 that protrudes including the fixing rib 442 opposite to the fixing rib 443 on the surface of the resin antenna 40 on which the fixing ribs 441, 442, and 443 and the pressing portions 442a and 443a are provided is integrated. Molded. As shown in the figure, the fixed guide 446 has a cable holding groove 447 that receives and holds the end of the coaxial cable 7 connected to the coaxial connector 47. The cable holding groove 447 is fixed by being connected to the coaxial connector 47 and restricting the end of the coaxial cable 7 except for the receiving direction and holding it in a fixed direction.

As described above, since the end portion of the coaxial cable 7 connected to the coaxial connector 47 is fixed by the fixing guide 446 of the resin base material 41, variation in antenna characteristics due to the routing of the coaxial cable 7 can be reduced. it can.
In addition, the fixed guide 446 of the coaxial cable 7 is formed at the same time by taking advantage of the features of the resin antenna 40 having a high degree of freedom in molding, so that the connected coaxial cable 7 can be fixed in a certain direction. Therefore, the influence on the antenna characteristics can be reduced.

(Embodiment 4)
FIG. 13 shows a fourth embodiment of the antenna device, and shows a system in which the relay substrate 45 is fitted into the resin antenna 40 in a fitting manner.
That is, as shown in FIG. 13A, the relay substrate 45 is located below the fixing rib 442 and the holding portion 442a on the opposite side along the inclined surface of the fixing rib 441 on one side from the upper side with respect to the resin antenna 40. As shown in FIG. 13B, it is assembled by fitting one side part and fitting the tip part below the fixed rib 443 and the holding part 443a in the back, and between the fixed ribs 441 and 442 on both sides. It will be in the fixed state under the holding parts 442a and 443a.

(Embodiment 5)
FIG. 14 shows Embodiment 5 of the antenna device, and shows a method of incorporating the relay substrate 45 into the resin antenna 40 in a press-fit manner.
That is, as shown in FIG. 14 (a), two press-fitting holes 451 are formed in the relay substrate 45, and the resin antenna 40 is provided with a fixing rib 441 only on one side and two on the flat portion 416. The press-fit fixing ribs 449 are formed in advance.
Therefore, the relay substrate 45 is lowered from the upper side along the inclined surface of the fixing rib 441 on one side as shown in FIG. 14A with respect to the resin antenna 40, as shown in FIG. 14B. The press-fitting and fixing ribs 449 are press-fitted into the press-fitting holes 451 to be fixed to the two press-fitting and fixing ribs 449.

In the above embodiment, the present invention is applied to a mobile phone, but the present invention is not limited to this, and may be applied to a mobile communication terminal such as a PDA or other mobile terminal.
In the embodiment, the resin base material has an L-shaped cross section. However, the present invention is not limited to this, and other shapes such as a U-shaped cross section and a rectangular box shape may be used.
Furthermore, in the embodiment, the battery is disposed between the antenna device and the substrate. However, the present invention is not limited to this, and the configuration may be any structure as long as the antenna device and the substrate are separated from each other.
In addition, the shape of the resin base material and the antenna pattern are arbitrary, and it is needless to say that the number and shape of the fixing ribs, the specific detailed structure of the power supply pins, the matching circuit, etc. can be changed as appropriate. .

1 is a perspective view showing a configuration of an embodiment of a mobile communication terminal to which the present invention is applied, as viewed from the front side in a state in which a foldable mobile phone is opened. It is the perspective view which looked at the foldable mobile phone of FIG. 1 from the back side. FIG. 2 is an exploded perspective view showing one case member of the housing in which the antenna device is built from the inside in the foldable mobile phone of FIG. 1. FIG. 4 is an enlarged view of a resin antenna of the antenna apparatus of FIG. 3, and is a perspective view (a) viewed from the antenna electrode side and a perspective view (b) viewed from the power feeding unit side. They are the perspective view (a) which showed the time of incorporating a relay board | substrate in the resin antenna of FIG. 4, and the perspective view (b) which showed the incorporation state. FIG. 4 is an equivalent circuit diagram of a substrate according to the antenna device of FIG. 3. It is the side view which showed the spring connector used for the electric power feeding pin of the relay board | substrate of FIG. It is the side view which showed the leaf | plate spring used for the electric power feeding pin of the relay board | substrate of FIG. 10 is a perspective view of the antenna device according to the second embodiment, viewed from the coaxial connector and the matching circuit pattern side. FIG. FIG. 10 is an equivalent circuit diagram of a matching circuit pattern of the antenna device of FIG. 9. FIG. 10 is a perspective view of the antenna device according to the third embodiment, as viewed from the coaxial connector and the cable fixing guide side. It is the perspective view which decomposed | disassembled and showed the coaxial cable from FIG. 4A and 4B show a fourth embodiment of the antenna device, and are a perspective view showing a case where a relay board is fitted into a resin antenna and is assembled, and a perspective view showing an assembled state. 7 shows a fifth embodiment of the antenna device, and is a perspective view (a) showing a case where a relay board is assembled into a resin antenna in a press-fit manner, and a perspective view (b) showing an assembled state. The conventional antenna apparatus which insert-molded sheet metal to resin is shown, The perspective view (a) seen from the sheet metal, the perspective view (b) seen from the opposite side, and the perspective view of the state which connected the coaxial cable (C).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st housing | casing 10 Antenna apparatus 101 Sheet metal 102 Relay board 103 Coaxial connector 104 Coaxial cable 105 Resin base material 11 Case member 12 Case member 13 Reception part 14 Display part 2 2nd housing | casing 21 Case member 22 Case member 23 Transmission Speaking section 24 Key operation section 25 Battery cover 26 Speaker sound emitting hole 27 Antenna mounting section 28 Battery housing opening 3 Hinge section 4 Antenna device 40 Resin antenna 41 Resin substrate 411 Flat section 412 Outer end face 413 Outer end face 414 Outer end face 415 Outer peripheral end surface 416 Flat portion 42 First antenna element 43 Second antenna element 441 Fixing rib 442 Fixing rib 442a Pressing part 443 Fixing rib 443a Pressing part 444 Depression 446 Fixing guide 447 Cable holding fixing rib 449 Press fitting fixing rib 45 Relay board 451 Hole 46 Power supply pin 461 Sp Ring connector 462 body 463 pin 465 leaf spring 466 main body 467 distal end portion 47 coaxial connector 48 matching circuit 481 circuit elements 5 board 51 matching circuit 511 circuit elements 512 circuit elements 52 coaxial connector 53 receiving circuit 6 cell 7 coaxial cable

Claims (6)

A relay board that relays the connection between the antenna and the coaxial cable, having a power supply pin connected to the power feeding portion of the antenna and a coaxial connector to which the coaxial cable is connected;
An antenna apparatus, comprising: a resin antenna integrally formed with an antenna feeding portion to which an antenna and the relay board are connected; and a fixing rib that slides and fixes the relay board.   The antenna device according to claim 1, wherein a plurality of the fixing ribs are provided at intervals along both sides in the sliding direction of the relay substrate with respect to the resin antenna.   3. The antenna device according to claim 1, wherein the feeding portion of the resin antenna is provided in a recess formed for connection of the feeding pin of the relay substrate.   The resin antenna has a fixing guide for fixing the connected coaxial cable in a certain direction when the relay board is fixed to the resin antenna and the coaxial cable is connected to the fixed relay board. The antenna device according to claim 1, further comprising: an antenna device according to claim 1.   The antenna device according to claim 4, wherein the fixed guide has a cable holding groove that receives and holds the coaxial cable connected to the coaxial connector.   The antenna apparatus according to claim 1, wherein the antenna apparatus is mounted on a mobile communication terminal.

Images