JP5067292B2 - Receiver, antenna and relay cable - Google Patents

Description

  The present invention relates to a receiving device, an antenna, and a relay cable, and can be applied to, for example, a mobile phone capable of receiving digital radio broadcasting. According to the present invention, a plurality of core cables are provided in at least the first cable of the first and second cables constituting the parallel cable, and the plurality of core cables are assigned to signal transmission and provided in the main unit. By connecting to the antenna input end of the tuner and making the external device side of the second cable the open end and grounding the main unit side end, it is possible to use highly versatile parts, and the antenna gain compared to the conventional one To reduce the loss.

  Conventionally, mobile phones that can receive television broadcasts or the like receive broadcast waves with a built-in antenna or an external antenna. Here, the built-in antenna has an advantage that the design of the mobile phone is not impaired. However, the built-in antenna has disadvantages such as inferior sensitivity to an external antenna and being easily affected by internal noise.

  In contrast, external antennas include a rod antenna, an earphone antenna, and the like. Here, the rod antenna is characterized by superior sensitivity and the like as compared with the built-in antenna. However, the rod antenna has a drawback in that the design of the mobile phone is damaged and the antenna protrudes.

On the other hand, the earphone antenna uses an earphone cable as an antenna as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-104591. The earphone antenna disclosed in Japanese Patent Application Laid-Open No. 2007-104591 transmits a high-frequency signal induced in the earphone cable to the main body device via a relay cable using a multicore coaxial cable. The earphone antenna can prevent the deterioration of sensitivity and the influence of internal noise without impairing the design of the mobile phone.
Japanese Patent Laid-Open No. 2007-104591

  However, as in the configuration disclosed in Japanese Patent Application Laid-Open No. 2007-104591, when a high-frequency signal induced in the earphone cable is transmitted to the main unit using a multicore coaxial cable, the coaxial cable is an unbalanced transmission path. Therefore, there is a problem that loss is likely to occur. In addition, the multi-core coaxial cable itself has a problem of low versatility.

  The present invention has been made in consideration of the above points, and proposes a receiving apparatus, an antenna, and a relay cable that can use highly versatile parts and can reduce the loss of antenna gain as compared with the prior art. It is what.

  In order to solve the above-mentioned problems, the invention of claim 1 is directed to a main body device that transmits a desired signal to an external device and receives a broadcast wave by a built-in tuner, one end connected to the main body device, and the like. The present invention is applied to a receiving device having an end connected to a cable of the external device and a relay cable for transmitting the signal between the main device and the external device. In the invention of claim 1 of the present application, the relay cable includes a parallel line cable in which the first and second cables are arranged in parallel at a predetermined interval, and at least the first cable includes a plurality of core cable. The plurality of core cables are assigned to the signal transmission and connected to the antenna input terminal of the tuner. The second cable is connected to the main device side end of the first cable from the main device side end of the first cable, or from the main device side end of the first cable to the first cable. The external device side end is disposed along the first cable until the middle of the external device side end, the external device side end is an open end in terms of high frequency, and the main device side end is grounded by the main device.

  According to a fifth aspect of the present invention, there is provided a parallel line cable in which the first and second cables are arranged in parallel at a predetermined interval when applied to an antenna, and one end of the parallel line cable is connected to the main unit. The other end of the parallel line cable is connected to a cable of an external device. Here, at least the first cable has a plurality of core cables, and the plurality of core cables are assigned to transmission of signals between the main body device and an external device, and a tuner provided in the main body device Connected to the antenna input. The second cable is connected from the main device side end of the first cable to the external device side end of the first cable, or from the main device side end of the first cable. Arranged along the first cable up to the middle of the external device side end, the external device side end is an open end in terms of high frequency, and the main device side end is grounded by the main device.

  According to a sixth aspect of the present invention, there is provided a parallel line cable in which the first and second cables are arranged in parallel at a predetermined interval when applied to a relay cable, and one end of the parallel line cable is interposed via a connector. The other end of the parallel wire cable is connected to the earphone cable via a connector. Here, at least the first cable has a plurality of core cables, and the plurality of core cables are assigned to transmission of an audio signal output from the main device, and a tuner provided in the main device is provided. Connected to the antenna input. The second cable is connected to the earphone side end of the first cable from the main device side end of the first cable or from the main device side end of the first cable. Arranged along the first cable up to the middle of the earphone side end, the earphone side end is an open end in terms of high frequency, and the main device side end is grounded by the main device.

  According to the configuration of claim 1, claim 5 or claim 6, the high frequency signal induced in the first cable and the cable of the external device or the high frequency signal induced in the first cable and the cable of the earphone. A signal is input to the tuner, which causes these cables to function as antennas. Further, the high frequency signal induced in the second cable is input to the tuner via the first cable, whereby the second cable functions as an antenna. Thereby, the first and second cables constituting the parallel line cable can each function as an antenna. Here, it can be said that the parallel cable is more versatile than the multi-core coaxial cable. As a result, an earphone antenna or the like can be configured using parts that are more versatile than conventional ones. In this case, since the high-frequency signal induced in the cable is directly input to the antenna input terminal of the tuner, it is possible to reduce the loss of the antenna gain compared to the case where transmission is performed using a multi-core coaxial cable.

  According to the present invention, highly versatile parts can be used, and the antenna gain loss can be reduced as compared with the prior art.

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

(1) Configuration of Embodiment FIG. 2 is a perspective view showing a mobile phone system according to Embodiment 1 of the present invention. The cellular phone system 1 receives digital radio broadcasts by an earphone antenna using a relay cable 2 and an earphone 3. In the mobile phone system 1, an earphone 3 is connected to a mobile phone 4 that is a main device via a relay cable 2.

  For this reason, in the earphone 3, the plug 7 is disposed at one end of the cable 6, and the right channel and left channel speakers 8 </ b> R and 8 </ b> L are disposed at the other end of the cable 6. In the relay cable 2, a jack 11 for connecting the plug 7 of the earphone 3 is disposed at one end of the cable 10, and a plug 12 is disposed at the other end of the cable 10. The mobile phone 4 is provided with a jack 13 for connecting the plug 12 on the side surface.

  FIG. 3 is a side view showing the earphone 3 in detail. The earphone 3 is connected to a parallel three-wire cable in which the parallel two-wire cables extending from the right channel and left channel speakers 8R and 8L are shared by the right and left channel audio signals. . In the earphone 3, the other end of the parallel three-wire cable is connected to each terminal 7R, 7L, 7G (FIG. 1) of the plug 7.

  In the earphone 3, the length of the cable 6 is set to 0.750 [m], which is a half wavelength of the frequency 200 [MHz], which is a frequency band of digital radio broadcasting. The earphone 3 is formed so that the cable on the left channel side is longer than the cable on the right channel side, and the cable on the right channel side or the left channel side is set to 0.750 [m].

  FIG. 4 is a side view showing the relay cable 2 in detail. In the relay cable 2, a 3-pin jack 11 for connecting the plug 7 of the earphone 3 is provided at one end of the cable 10, and a 10-pin plug 12 is provided at the other end of the cable 10. The jack 11 and the plug 12 are molded with resin.

  Here, FIG. 5 is a perspective view showing the cable 10 of the relay cable 2. The cable 10 is a parallel line cable in which the first and second cables 10A and 10B are held in parallel while being separated by a certain distance D. In this cable 10, the first cable 10 </ b> A is a multicore cable created by combining three core wire cables LL, LR, and LG. These three core cables LL, LR, LG are assigned to the hot side of the left channel audio signal, the hot side of the right channel audio signal, the ground of the left channel audio signal and the right channel audio signal, respectively. The second cable 10B is created by one core wire cable G and assigned to the ground. Even in the second cable 10B, similarly to the first cable 10A, a multi-core cable may be used, and all the core cables may be assigned to the ground.

  The cable 10 is set to a length of 0.375 [m], which is about a quarter wavelength of a frequency 200 [MHz], which is a frequency band of digital radio broadcasting.

  FIG. 1 is a connection diagram showing the cellular phone system 1. In the relay cable 2, the three core cables LL, LR, LG of the first cable 10A are connected to the corresponding terminals 11L, 11R, 11G of the jack 11 at the end of the earphone 3 side. On the other hand, the core cable G of the second cable 10B is not connected to any part at the end of the earphone 3 and is an open end.

  The relay cable 2 has a wiring board 14 disposed on the back surface of the plug 12 and is connected to the plug 12 via the wiring board 14. In the relay cable 2, three core wire cables LL, LR, LG arranged on the first cable 10 </ b> A are connected to each other on the wiring board 14 via capacitors 16, 17. In the broadcast wave to be received, these three core cables LL, LR, LG are set in a short circuit state. The capacitors 16 and 17 preferably have sufficiently low impedance in the reception frequency band in the cellular phone system 1, and preferably about 1000 [pF] when receiving digital radio broadcasts.

  In the relay cable 2, core cables LL and LR assigned to the hot side of the left channel audio signal and the hot side of the right channel audio signal are connected to the mobile phone 4 via the high frequency cutoff circuits 18 and 19. Here, the high-frequency cutoff circuits 18 and 19 are circuits that prevent high-frequency signals induced in the core cables LL and LR from entering an audio signal amplification circuit or the like. Therefore, the high frequency cutoff circuits 18 and 19 can be applied with an inductance element having a sufficiently low impedance with respect to the audio signal and an impedance increasing with an increase in frequency. . The high-frequency cutoff circuits 18 and 19 desirably ensure an impedance of 1 [kΩ] or higher at the frequency of the high-frequency signal intended to prevent entry.

  In the relay cable 2, the core cable LG assigned to the ground of the left channel audio signal and the right channel audio signal and the core cable G of the second cable 10B are connected to the mobile phone via the wiring board 14, the plug 12, and the jack 13. 4 is connected.

  Here, the mobile phone 4 grounds the core cable G of the second cable 10B inside. The cellular phone 4 grounds the core wire cable LG assigned to the ground of the audio signal by the high frequency cutoff circuit 20, thereby setting the DC potential of the cable LG to the ground level. The cellular phone 4 connects the core cable LG to the antenna input terminal of the tuner 22 via the capacitor 21.

  Therefore, as shown in FIG. 6, in this cellular phone system 1, an antenna ANT having a length H of 3λ / 4 formed by connecting the first cable 10 </ b> A to the cable 6 of the earphone 3 is connected to the tuner 22. On the base side of the antenna ANT, the second cable 10B having a length H1 of λ / 4 and having a base portion grounded along the antenna ANT is disposed.

  The cellular phone 4 amplifies the right channel and left channel audio signals SAR and SAL obtained from the tuner 22 by the amplification circuits 24R and 24L, respectively, and then inputs the amplified signals to the built-in speaker 26 via the switching circuit 25.

  Further, the mobile phone 4 detects the connection of the relay cable 2 by a detection mechanism (not shown), switches the operation of the switching circuit 25 when the relay cable 2 is connected, and stops outputting the audio signals SAR and SAL to the built-in speaker 26. At the same time, these audio signals SAR and SAL are output to the relay cable 2.

(2) Operation of Embodiment In the above configuration, in the cellular phone system 1 (FIGS. 1 and 2), the tuner 22 starts up in response to a user operation, and the audio signal SAL received by the tuner 22 is activated. And SAR are output from the built-in speaker 26. When the relay cable 2 is connected to the mobile phone 4, the audio signals SAL and SAR are output to the relay cable 2 instead of the built-in speaker 26.

  In the mobile phone system 1, the audio signals SAL and SAR are supplied to the earphone 3 by the core cables LL, LR, LG provided in the first cable 10A constituting the parallel cable 10 of the relay cable 2. Speakers 8L and 8R of earphone 3 are driven by signals SAL and SAR. In the cellular phone system 1, the sound of the broadcast wave received by the tuner 22 is thereby provided to the user by the earphone 3.

  In the mobile phone system 1, in the state where the audio signals SAL and SAR are transmitted to the earphone 3 through the relay cable 2 in this way, the high frequency of various broadcast waves is transmitted to the cable 10 of the relay cable 2 and the cable 6 of the earphone 3. A signal will be induced.

  Here, in the cellular phone system 1, the core cables LL, LR, LG provided on the first cable of the relay cable 2 and the cable 6 of the earphone 3 are connected by the plug 7 and the jack 11. 6, high frequency signals induced in LL, LR, and LG are input to the antenna input terminal of the tuner 22 provided in the mobile phone 4. The high-frequency signal induced in the core cable G of the second cable 10B provided in the relay cable 2 is the core cables LL, LG, LB of the first cable 10A arranged in parallel with the second cable 10B. Is coupled to the antenna input terminal of the tuner 22 via the core cables LL, LG, LB.

  Thereby, in this Example, the 1st and 2nd cables 10A and 10B of a parallel wire cable can each be functioned as an antenna. Here, it can be said that the parallel cable is more versatile than the multi-core coaxial cable. Therefore, in this embodiment, the earphone antenna can be configured by using inexpensive parts that are more versatile than conventional ones.

  In this embodiment, the high frequency signals induced in the cables 6 and 10 are directly input to the antenna input terminal of the tuner 22, so that a high frequency signal is transmitted using a multi-core coaxial cable. Loss of antenna gain can be reduced.

  Further, sufficient antenna gain can be ensured in a wider frequency band, and good characteristics can be obtained by applying to a receiving apparatus that receives broadcast waves in various frequency bands.

  That is, FIG. 7A is a characteristic curve diagram showing the characteristics of the antenna of the cellular phone system 1, and shows a case where measurement is performed in free space. Here, the symbols LH and LV are characteristics of vertical polarization and horizontal polarization, respectively. FIGS. 7B and 7C are charts showing in detail the characteristics of the vertical polarization and horizontal polarization. The characteristics shown in FIG. 7 are the lengths H and H1 in FIG. 5 of 1.45 [m] and 0.150 [m], respectively, and an interval of 5 [mm] (without any resin or the like). FIG. 5D shows a characteristic in which the first and second cables 10A and 10B are arranged in parallel in the space.

  8A to 8C, in contrast to FIGS. 7A to 7C, show the antenna when the earphone 3 is attached to the human body and the relay cable 2 is along the human body. It is a figure which shows a characteristic. The characteristics of FIG. 8 are measurement results of the antenna used for the measurement of FIG. According to the characteristics of FIG. 7, it can be seen that a sufficient gain can be secured in the VHF band. Further, according to the characteristics shown in FIG. 8, it is understood that the characteristics for sufficient use can be ensured even when worn on the human body.

  FIGS. 9A to 9C and FIGS. 10A to 10C are diagrams showing characteristics of this antenna in the UHF band in comparison with FIGS. 7A to 7C. FIG. 9 shows the characteristics measured in free space, and FIG. 10 shows the characteristics when worn on a human body. 9 and 10, it can be understood that the antenna effectively functions as a wide frequency band and a sufficient gain can be secured.

  11 and 12 are graphs showing characteristics in the VHF band and the UHF band when a rod antenna for the UHF band is used in comparison with FIGS. 7 to 10. In this case, although a sufficient gain can be secured in the UHF band, a sufficient gain cannot be secured in the VHF band, and it can be seen that the UHF band can be used only in one band. 11 and 12, it can be seen that the earphone antenna according to this embodiment effectively functions as an antenna in a wide frequency band and can secure a sufficient gain.

  FIG. 13 is a diagram showing characteristics in free space when the distance D is 1 [mm] in comparison with FIG. In this case, the gain is reduced in almost the entire frequency band as compared with the characteristics shown in FIG. This is presumably because the coupling between the first and second cables 10A and 10B becomes too dense, and a high-frequency signal leaks from the core cable LL, LR, LG side to the second cable 10B side. Here, the cable 10 is a parallel line, and the capacitance related to the coupling of the parallel lines varies depending on the distance D, the conductor diameter, and the dielectric constant of the dielectric surrounding the conductor. Therefore, even when the distance D is reduced by selecting the conductor diameter and the dielectric constant of the dielectric surrounding the conductor to reduce the coupling between the conductors by reducing the distance D, the distance D is 5 mm. It is considered that the same characteristics can be secured. The capacitance of the parallel line is described in various textbooks and the like for the parallel two-wire feeder, and is widely known.

(3) Effects of the embodiment According to the above configuration, a plurality of core cables are provided in at least the first cable of the first and second cables constituting the parallel cable, and the plurality of core cables are connected to the audio signal. Highly versatile parts can be obtained by allocating to transmission and connecting to the antenna input end of the tuner provided in the main unit, making the earphone side end of the second cable the open end and grounding the main unit side end The antenna gain can be reduced as compared with the prior art.

  FIG. 14 is a connection diagram showing a mobile phone system according to the second embodiment of the present invention, in comparison with FIG. The mobile phone system 31 is configured in the same manner as the mobile phone system 1 of the first embodiment except that a relay cable 32 and a mobile phone 34 are provided instead of the relay cable 2 and the mobile phone 4.

  Here, as the relay cable 32, the cable 33 is applied instead of the cable 10. Here, the cable 33 is a parallel cable formed by the first and second cables 33A and 33B. The first cable 33A is a multi-core cable having two core cables LL and LR, and the two core cables LL and LG are assigned to the hot side of the left channel audio signal and the hot side of the right channel audio signal. It is done. Similar to the cable 10, the second cable 33B has a single core cable G, and this single core cable G also serves as a ground for the left channel audio signal and the right channel audio signal.

  Therefore, the core wire G is connected to the corresponding terminal 11G of the jack 11 via the high frequency cutoff circuit 35 disposed at the base of the jack 11, and the other end side is grounded in the mobile phone 34. As shown in FIG. 15, the end of the relay cable 33 on the earphone 3 side is connected to the wiring board 39 on which the 3-pin jack 11 is mounted, the cable G around which the ferrite beads 37 are wound, and the core cables LL and LR. The entirety is stored in a case 38. The high frequency cutoff circuit 35 is formed by the ferrite beads 37. Therefore, in this embodiment, the second cable 33B is opened at the earphone 3 side end in terms of high frequency by the high frequency cutoff circuit 35.

  The core wire cables LR and LL are connected by a capacitor 16 on the wiring board 14. The core cable LL is connected to the plug 12 via the high frequency cutoff circuit 18 and is connected to the switching circuit 25 in the mobile phone 34. On the other hand, the core cable LR is connected to the switching circuit 25 through the high frequency cutoff circuit 36 in the mobile phone 34 and is connected to the antenna input terminal of the tuner 22 through the capacitor 21. A chip inductor is applied to the high frequency cutoff circuit 36.

  As a result, in this embodiment, the transmission of the audio signal is shared by the first and second cables 10A and 10B constituting the parallel line cable, the structure of the relay cable is simplified, and the same effect as in the first embodiment is obtained. be able to.

  FIG. 16 is a connection diagram showing a relay cable applied to the mobile phone system according to the third embodiment of the present invention in comparison with FIG. The mobile phone system of this embodiment receives terrestrial digital broadcasting. Therefore, in this embodiment, the relay cable 42 shown in FIG. 16 is applied in place of the relay cable 2, and the mobile phone is provided with a tuner for receiving digital terrestrial broadcasting. Except for these points, the mobile phone system of this embodiment is configured in the same manner as the mobile phone system 1 of FIG.

  Here, the terrestrial digital broadcast is broadcast in the UHF band of 470 to 770 [MHz]. In the frequency 500 [MHz] within the band of the terrestrial digital broadcasting, one wavelength is 0.6 [m], and H and H1 in FIG. 5 are 0.15 [m] and 0.45 [m], respectively. ].

  Therefore, in this embodiment, high-frequency cutoff circuits 44, 45, and 46 are provided at the earphone 3 side ends of the core cables LL, LR, and LG used for transmitting audio signals. In the relay cable 42, the electrical length of the antenna by the cables LL, LR, LG is limited by the high frequency cutoff circuits 44, 45, 46, and the length H is set to 0.15 [m]. The high-frequency cutoff circuits 44, 45, and 46 are configured by ferrite beads arranged on a wiring board on which the jack 11 is mounted, or by arranging chip inductors, as described above for the second embodiment.

  The relay cable 43 is set so that the second cable 10B is interrupted at a position 0.45 [m] in length from the plug 12. The second cable 10B, together with the second cable 10A, protects the wire by molding the end of the second cable 10B on the earphone 3 side with resin.

  As in this embodiment, a high frequency cutoff circuit is arranged at the end of the relay cable, and further, the second cable is interrupted halfway, and the electrical length of the antenna is set to a desired length. Also, the same effects as those of the first embodiment can be obtained.

  FIG. 17 is a connection diagram showing a relay cable and a mobile phone applied to the mobile phone system according to the fourth embodiment of the present invention in comparison with FIG. The mobile phone system according to this embodiment is configured to be able to make a call by hands-free and to remotely control the mobile phone 54 by using a remote control unit 53 provided on the relay cable 52.

  Here, the relay cable 52 includes a parallel line cable 55 including first and second cables 55A and 55B, and a plug 12 and a remote control unit 53 are provided at both ends of the parallel line cable 55, respectively.

  Here, as shown in FIG. 18, the first cable 55A of the cable 55 is a multi-core cable composed of four core cables LL, LR, LM, LSW, and the core cables LL, LR are respectively the left channel audio signal SAL. And assigned to the hot side of the right channel audio signal SAR. Also, the core cable LM is assigned to the audio signal transmission hot side acquired by the microphone 56 described later, and the core cable LSW is assigned for remote control operation. On the other hand, the second cable 55B is formed by a single core cable G.

  The remote control unit 53 is created by connecting a cable 55 to a wiring board on which a microphone 56, a jack 11, a remote control operation switch 57, and the like are mounted, and then storing the cable 55 in a case.

  Here, the microphone 56 acquires the voice of the user related to the hands-free system and outputs the voice signal. The microphone 56 is provided with a protective varistor 58 between output terminals. The microphone 56 has one end connected to the second terminal of the plug 12 via the core cable LM, the high frequency cutoff circuit 59 and the core cable G of the second cable 55B sequentially, and the other end connected to the tenth of the plug 12. Connected to the terminal. Correspondingly, in the mobile phone 54, the tenth terminal of the jack 13 is grounded. Further, the cellular phone 54 inputs an audio signal acquired by the microphone 56 via the second terminal of the jack 13, and inputs this audio signal to an audio signal processing circuit (not shown) via the high frequency cutoff circuit 60. The cellular phone 54 processes the audio signal by this audio signal processing circuit and sends it out to the call target.

  The switch 57 has one end connected to the cold side of the microphone 56 and the other end connected to the eighth terminal of the plug 12 via a core cable LSW for remote control operation. Correspondingly, in the mobile phone 54, the eighth terminal of the jack 13 is connected to the controller 63 via the high-frequency cutoff circuit 62, and the controller 63 detects the on / off operation of the switch 57. The controller 63 controls the operation of each unit based on the detection result of the on / off operation, and thus the mobile phone system is configured to be remotely controlled by the on / off operation of the switch 57.

  The jack 11 has terminals 11R and 11L connected to the fourth and fifth terminals of the plug 12 via core cables LR and LL assigned to the hot side of the right channel audio signal SAR and the left channel audio signal SAL, respectively. The Further, the core wire cables LR and LL are connected by a capacitor 66 at the plug 12 side end. The jack 11 has a terminal 11G connected to the cold side of the microphone 56. Correspondingly, in the cellular phone 54, the audio signals SAR and SAL output from the switching circuit 25 described above for the first embodiment and the like are connected to the fourth and fifth terminals of the jack 13 via the high frequency cutoff circuits 64 and 65, respectively. Is output.

  In the relay cable 52, the core cable LR is connected to the first terminal of the plug 12 via the capacitor 67, and the mobile phone 54 is connected to the antenna of the tuner 70 via the capacitor 69. Connected to the input end. As described above, the electrical length of the second cable 55B is limited by the high-frequency cutoff circuit 59 provided on the earphone side, and the mobile phone 54 side end is grounded.

  Thereby, also in this mobile phone system, the same effect as in the second embodiment can be obtained by causing the relay cable 52 and the cable of the earphone 3 to function as an antenna in the same manner as in the second embodiment.

  In the example of FIG. 17, the tenth terminal of the plug 12 is connected to the third and sixth terminals of the plug 12 on the wiring board 14. In the mobile phone 54, the third and sixth terminals of the corresponding jack 13 are grounded by capacitors 71 and 72, respectively, and are connected to the controller 63 via the high frequency cutoff circuits 73 and 74. Accordingly, the cellular phone 54 determines the potentials of the third and sixth terminals of the jack 13 by the controller 63, determines whether the relay cable 52 is connected, and whether the relay cable 52 is stereo-compatible. Based on this, the operation of each unit is controlled.

  According to this embodiment, even when a microphone, a switch, or the like is provided on the earphone side, the same effect as that of the second embodiment can be obtained by configuring the relay cable or the like as in the second embodiment. .

  FIG. 19 is a connection diagram showing a relay cable and a mobile phone applied to the mobile phone system according to the fifth embodiment of the present invention, in comparison with FIG. The mobile phone system of this embodiment is configured in the same manner as the mobile phone system of the above-described embodiment except that the configurations of the relay cable 82 and the mobile phone 84 are different.

  Here, the relay cable 82 includes a parallel line cable 85 including first and second cables 85A and 85B, and a plug 12 and a remote control unit 83 are provided at both ends of the parallel line cable.

  The first cable 85A is a multi-core cable including five core cables LL, LR, LM, LSW, and LG, and the core cables LL and LR are respectively connected to the hot sides of the left channel audio signal SAL and the right channel audio signal SAR. Assigned. The core cable LM is assigned to the hot side for audio signal transmission, and the core cable LSW is assigned for remote control operation. The core wire cable LG is assigned to the ground. On the other hand, the second cable 85B is formed by a single core cable G.

  The remote control unit 83 is configured in the same manner as the remote control unit 53 described in the fourth embodiment except that the terminal 11G of the jack 11 is connected to the first terminal of the plug 12 via the core cable LG. Correspondingly, the cellular phone 54 has an antenna input terminal of the tuner 70 in a state where the first terminal 11G of the corresponding jack 13 is grounded via the high frequency cutoff circuit 86 and the core cable G is grounded in a DC manner. The configuration is the same as that of the mobile phone 54 described above with respect to the fourth embodiment except that the core cable G is connected to the mobile phone.

  According to this embodiment, even when a microphone, a switch, or the like is provided on the earphone side, the same effect as that of the first embodiment can be obtained by configuring the relay cable or the like as in the first embodiment. .

  FIG. 20 is a connection diagram showing a relay cable and a mobile phone applied to the mobile phone system according to the sixth embodiment of the present invention in comparison with FIG. The mobile phone system of this embodiment is configured in the same manner as the mobile phone system of the above-described embodiment 5 except that the configuration of the relay cable 92 is different.

  Here, the relay cable 92 includes a parallel line cable 95 including first and second cables 95A and 95B, and a plug 12 and a remote control unit 83 are provided at both ends of the parallel line cable, respectively.

  The first cable 95A has the same configuration as the first cable 85A applied to the mobile phone system of the fifth embodiment described above. On the other hand, the second cable 95 </ b> B is formed by one core cable G and is formed so as to be interrupted on the way to the remote control unit 83.

  Correspondingly, the relay cable 92 is configured in the same manner as the mobile phone system of the above-described fifth embodiment except that the cold side of the microphone 56 is connected to the core wire cable LG via the high frequency cutoff circuit 97.

  According to this embodiment, even when a microphone, a switch, or the like is provided on the earphone side, the same effect as that of the third embodiment can be obtained by configuring the relay cable or the like as in the third embodiment. .

  In the above-described embodiment, the case of receiving digital radio broadcast or the like has been described. However, the present invention is not limited to this, and can be widely applied to receiving various broadcast waves.

  In the above-described embodiment, the case where the relay cable is detachably connected using the connector and the earphone is further connected has been described. However, the present invention is not limited to this, and the so-called built-in relay cable is difficult to attach and detach. And it can apply widely also when connecting an earphone.

  In the above-described embodiments, the case where the earphone cable is used as an antenna has been described. However, the present invention is not limited to this, and audio signals, video signals, and the like can be transmitted to various external devices via a signal transmission cable. The present invention can be widely applied when various signals are transmitted, and further when power is transmitted to an external device via a power transmission cable.

  In the above-described embodiments, the case where the present invention is applied to a mobile phone system has been described. However, the present invention is not limited thereto, and is widely applied to various receiving devices such as a portable music player having a broadcast wave receiving function. Can be applied.

  The present invention can be applied to, for example, a mobile phone capable of receiving digital radio broadcasts.

1 is a connection diagram illustrating a mobile phone system according to a first embodiment of the present invention. 1 is a perspective view illustrating a mobile phone system according to a first embodiment of the present invention. It is a side view which shows the earphone of the mobile telephone system of FIG. 2 in detail. It is a side view which shows the relay cable of the mobile telephone system of FIG. 2 in detail. It is a perspective view which shows the cable of the relay cable of FIG. It is a connection diagram with which it uses for description of the antenna of the mobile telephone system of FIG. It is a figure which shows the characteristic in the free space of the antenna of the mobile telephone system of FIG. It is a figure which shows the characteristic at the time of use of the antenna of the mobile telephone system of FIG. It is a figure which shows the characteristic of the UHF band in the free space of the antenna of the mobile telephone system of FIG. It is a figure which shows the characteristic of a UHF band at the time of use of the antenna of the mobile telephone system of FIG. It is a figure which shows the characteristic in the VHF band using the rod antenna for UHF bands. It is a figure which shows the characteristic in the UHF band using the rod antenna for UHF bands. It is a figure which shows the characteristic in the free space when the space | interval D is 1 [mm]. It is a connection diagram which shows the mobile telephone system of Example 2 of this invention. It is a side view which shows the relay cable of the mobile telephone system of FIG. It is a connection diagram which shows the relay cable applied to the mobile telephone system of Example 3 of this invention. It is a connection diagram which shows the relay cable and mobile phone which are applied to the mobile phone system of Example 4 of this invention. It is a perspective view with which it uses for description of the relay cable of the mobile telephone system of FIG. It is a connection diagram which shows the relay cable and mobile phone which are applied to the mobile phone system of Example 5 of this invention. It is a connection diagram which shows the relay cable and mobile phone which are applied to the mobile phone system of Example 6 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31 ... Mobile phone system 2, 32, 42, 52, 82, 92 ... Relay cable, 3 ... Earphone, 4, 34, 54, 84 ... Mobile phone, 6, 10, 10A, 10B, 33, 33A, 33B, 55, 55A, 55B, 85, 85A, 85B, 95, 95A, 95B ... Cable, 7, 12 ... Plug, 8L, 8R ... Speaker, 11, 13 ... Jack, 16, 17, 21, 66, 67, 69, 71, 72 .. capacitor, 18, 19, 20, 35, 36, 44, 45, 46, 59, 60, 64, 65, 73, 74, 86, 97. High frequency cutoff circuit, 22, 70 ... Tuner, 53, 83 ... Remote control unit, LL, LR, LG, LM, LSW, G ... Core cable

Claims (6)

A main unit that transmits a desired signal to and from an external device and receives a broadcast wave by a built-in tuner;
One end is connected to the main unit, the other end is connected to a cable of the external device, and has a relay cable for transmitting the signal between the main unit and the external device,
The relay cable is
A parallel line cable in which the first and second cables are arranged in parallel with a predetermined distance therebetween;
At least the first cable is
Having multiple core cables,
The plurality of core cables are assigned to the transmission of the signal and connected to the antenna input terminal of the tuner,
The second cable is
From the main device side end of the first cable to the external device side end of the first cable, or from the main device side end of the first cable to the external device side end of the first cable Arranged along the first cable,
The external device side end is an open end in terms of high frequency,
A receiving device in which the main device side end is grounded by the main device. The external device is an earphone;
The receiving device according to claim 1, wherein the signal is an audio signal that drives the earphone. The receiving device according to claim 1, wherein the relay cable is detachably connected to the main body device by a connector. The receiving device according to claim 1, wherein the external device is detachably connected to the relay cable by a connector. A parallel line cable in which the first and second cables are arranged in parallel with a predetermined distance therebetween;
One end of the parallel wire cable is connected to the main unit,
The other end of the parallel wire cable is connected to a cable of an external device,
At least the first cable is
Having multiple core cables,
The plurality of core cables are assigned to signal transmission between the main unit and an external device, and connected to an antenna input terminal of a tuner provided in the main unit,
The second cable is
From the main device side end of the first cable to the external device side end of the first cable, or from the main device side end of the first cable to the external device side end of the first cable Arranged along the first cable,
The external device side end is an open end in terms of high frequency,
An antenna in which the main device side end is grounded by the main device. A parallel line cable in which the first and second cables are arranged in parallel with a predetermined distance therebetween;
One end of the parallel wire cable is connected to the main unit through a connector,
The other end of the parallel line cable is connected to the earphone cable via a connector,
At least the first cable is
Having multiple core cables,
The plurality of core cables are assigned to transmission of an audio signal output from the main unit, and connected to an antenna input terminal of a tuner provided in the main unit,
The second cable is
From the main device side end of the first cable to the earphone side end of the first cable, or from the main device side end of the first cable to the middle of the earphone side end of the first cable, Disposed along the first cable;
The earphone side end is an open end in terms of high frequency,
A relay cable in which the main device side end is grounded by the main device.

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