CN100452531C - Earphone antenna and portable radio equipment provided with earphone antenna - Google Patents
Earphone antenna and portable radio equipment provided with earphone antenna Download PDFInfo
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- CN100452531C CN100452531C CNB200510064714XA CN200510064714A CN100452531C CN 100452531 C CN100452531 C CN 100452531C CN B200510064714X A CNB200510064714X A CN B200510064714XA CN 200510064714 A CN200510064714 A CN 200510064714A CN 100452531 C CN100452531 C CN 100452531C
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Abstract
Earphone antenna includes: earphone cable having signal lines; shield cable, and signal lines for audio signal and grounding wire, external thereof covered with shield wire, one end of shield cable connected to main body of radio equipment via multipin connector; and connection block connecting other end of shield cable to earphone cable. In connection block, audio signal transmission path is formed by connecting signal lines and grounding wire respectively to signal lines via high frequency choke exhibiting low impedance for audio signal and high impedance for high frequency signal, and connecting central conductor of coaxial cable and shield wire to unbalanced part of balun, connecting signal lines to one end of balanced part of balun via capacitor exhibiting high impedance for audio signal and low impedance for high frequency signal, and connecting other end of balanced part of balun to shield wire covering axial cable and signal lines, so that dipole antenna is formed with earphone cable and shield wire.
Description
Technical field
The present invention relates to be used to be worn on the earphone antenna of the portable radio device that uses on the human body, and the portable radio device that is equipped with this earphone antenna.
Background technology
Usually, being worn in the portable radio device that uses on the human body such as beep-pager, radio receiver, LCD television receiver, using telescopic antenna and utilize holding wire that audio signal transmission is arrived the earphone antenna of earphone as antenna.For example, this technology is disclosed in the patent documentation below:
[patent documentation 1] Japanese patent application discloses No.2003-163529 in early days.
In the portable radio device that uses telescopic antenna or earphone antenna, when on being worn on human body, using, can there be such problem: because antenna performance is understood severe exacerbation when being worn on human body on the time, for example in the situation of handling for example television broadcasting of the signal that has bulk information of vision signal, can not obtain enough receiving sensitivities.
Particularly, the earphone antenna utilization is used for audio signal transmission is arrived the holding wire of earphone as antenna, there is such problem in it: because earphone and/or holding wire directly contact with human body, so human body causes significant impact via antenna to wireless device, the stability of reception is deteriorated significantly.
In addition, for example in the television broadcasting of Japan, use is from 90 to 108MHz (1～3 channels), from the VHF wave band of 170 to 222MHz (4～12 channels) and from the UHF wave band of 470 to 770MHz (13～62 channels), therefore, the liquid crystal television receiver that is used for receiving television broadcasting need receive the high-frequency signal from 90 to 770MHz utmost point broadband scope, thereby, for traditional telescopic antenna or the earphone antenna of performance not as the fixed type antenna, have such problem: the utmost point cannot say for sure to demonstrate,prove enough sensitivity in above-mentioned required frequency band range.
In addition,, be subjected to, limited the design of portable radio device thus so the ground size of portable radio terminal influences its receiving sensitivity greatly because telescopic antenna and earphone antenna are the unipole antennas at λ/4 place's resonance.
Summary of the invention
The present invention wishes to solve the aforesaid drawbacks relevant with conventional art, and be desirable to provide a kind of earphone antenna, it can reduce the adverse effect of human body, and obtains high-gain in wide wavelength band, and a kind of portable radio device of guaranteeing to receive stability is provided.
Earphone antenna according to the embodiment of the invention comprises: headphone cable, comprise a pair of first holding wire, and described first holding wire is insulated to be coated with to be applied to earphone provides audio signal; Shielded type cable, the secondary signal line and the earth connection that are used for audio signal that comprise coaxial cable and be insulated coating, wherein said coaxial cable has center conductor, described center conductor transmits high-frequency signal, be coated with insulator on it, and be coated with first shielding conductor, and the outside of described coaxial cable, secondary signal line and earth connection is coated with the secondary shielding line via insulating material, and wherein an end of shielded type cable is connected to the fuselage of wireless device via multi-plug connector; And contiguous block, described contiguous block is connected to headphone cable with the other end of shielded type cable, wherein in contiguous block, secondary signal line by will being used for audio signal and earth connection are connected to a pair of first holding wire of headphone cable separately via high frequency choke coil corresponding signal line, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, and first shielding conductor of the center conductor of coaxial cable and coaxial cable is connected to the uneven part of balance/imbalance converter, a pair of first holding wire of headphone cable is connected respectively to an end of the balance portion of balance/imbalance converter via capacitor, and the other end of the balance portion of balance/imbalance converter is connected to the secondary shielding line that covers coaxial cable and secondary signal line outside, thereby the described secondary shielding line with headphone cable and covering coaxial cable and secondary signal line outside has disposed dipole antenna together, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the frequency range of audio signal, and becomes Low ESR in the frequency range of high-frequency signal.
In addition, portable wireless identification comprises according to another embodiment of the present invention: the fuselage of wireless device, the multitap jack is equipped with, and described multitap jack is connected to tuner and audio signal output unit; And earphone antenna, it comprises: headphone cable, comprise a pair of first holding wire, and described first holding wire is insulated to be coated with to be applied to earphone provides audio signal; Shielded type cable, the secondary signal line and the earth connection that are used for audio signal that comprise coaxial cable and be insulated coating, wherein said coaxial cable has center conductor, described center conductor transmits high-frequency signal, be coated with insulator on it, and be coated with first shielding conductor, and the outside of described coaxial cable, secondary signal line and earth connection is coated with the secondary shielding line via insulating material, and an end of shielded type cable is connected to the fuselage of wireless device via multi-plug connector; And contiguous block, described contiguous block is connected to headphone cable with the other end of shielded type cable, wherein in contiguous block, secondary signal line by will being used for audio signal and earth connection are connected to a pair of first holding wire of headphone cable separately via high frequency choke coil corresponding signal line, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, and first shielding conductor of the center conductor of coaxial cable and coaxial cable is connected to the uneven part of balance/imbalance converter, a pair of first holding wire of headphone cable is connected respectively to an end of the balance portion of balance/imbalance converter via capacitor, and the other end of the balance portion of balance/imbalance converter is connected to the secondary shielding line that covers coaxial cable and secondary signal line outside, thereby the described secondary shielding line with headphone cable and covering coaxial cable and secondary signal line outside has disposed dipole antenna together, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the frequency range of audio signal, and becomes Low ESR in the frequency range of high-frequency signal.
Embodiment according to earphone antenna of the present invention, in contiguous block, secondary signal line by will being used for audio signal and earth connection are connected respectively to headphone cable via high frequency choke coil a pair of first holding wire, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, be connected to equally the uneven part of balance/imbalance converter by first shielding conductor with the center conductor of coaxial cable and coaxial cable, and a pair of first holding wire of headphone cable is connected respectively to an end of the balance portion of balance/imbalance converter via capacitor, and the other end of the balance portion of balance/imbalance converter is connected to the secondary shielding line that covers coaxial cable and secondary signal line outside, make the secondary shielding line of headphone cable and covering coaxial cable and secondary signal line outside be used as dipole antenna together, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the frequency range of audio signal, and becomes Low ESR in the frequency range of high-frequency signal.Therefore, the feasible influence that can reduce human body, and obtaining high-gain in the frequency range on a large scale.
For example, earphone antenna according to the embodiment of the invention is equipped with stereophone, it is connected to aforementioned contiguous block via two headphone cable, and part is inserted high frequency choke coil in the way of one or two earphone cord therein, thereby make resonance frequency difference between the headphone cable, perhaps make resonance frequency variable.
In addition, can be configured to the switch that has microphone and be used to switch according to the earphone antenna of the embodiment of the invention, they are installed in the aforementioned contiguous block.
In addition, can also be configured to have amplifier according to the earphone antenna of the embodiment of the invention, it is installed in the aforementioned contiguous block.
In portable radio device according to the embodiment of the invention, in contiguous block, secondary signal line by will being used for audio signal and earth connection are connected respectively to headphone cable via high frequency choke coil a pair of first holding wire, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, be connected to equally the uneven part of balance/imbalance converter by first shielding conductor with the center conductor of coaxial cable and coaxial cable, and by a pair of first holding wire of headphone cable is connected respectively to an end of the balance portion of balance/imbalance converter via capacitor, and be connected to the secondary shielding line that covers coaxial cable and secondary signal line outside by the other end with the balance portion of balance/imbalance converter, with headphone cable with cover coaxial cable and the secondary shielding line of secondary signal line outside is configured to be connected to via the multitap jack fuselage of wireless device as the earphone antenna of dipole antenna, guaranteeing to receive stability in the frequency range on a large scale thus, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the frequency range of audio signal, and becomes Low ESR in the frequency range of high-frequency signal.
Hereinafter the specific embodiments of the invention shown in reference to the accompanying drawings are provided by more features of the present invention and the advantage that provides thus in detail.
Description of drawings
Fig. 1 shows the block diagram according to the configuration of LCD television receiver of the present invention;
Fig. 2 shows the diagrammatic sketch of the configuration that is used for the plug-socket connector that connects in the LCD television receiver between the fuselage of receiver and earphone antenna;
Fig. 3 shows the block diagram of configuration of the fuselage of receiver;
Fig. 4 shows the diagrammatic sketch of the configuration of the shielded type cable of forming earphone antenna;
Fig. 5 shows the diagrammatic sketch of the configuration of the contiguous block of forming earphone antenna;
Fig. 6 shows the electric wiring plan of the electricity configuration of earphone antenna;
Fig. 7 shows the electric wiring plan of the electricity configuration of the earphone antenna that combines the function that is installed in the microphone in the contiguous block;
Fig. 8 shows the electric wiring plan of the electricity configuration of the earphone antenna that amplifier is installed in contiguous block;
Fig. 9 shows the diagrammatic sketch according to another example of the configuration of earphone antenna of the present invention.
Embodiment
The present invention can for example be applied to LCD television receiver 100 shown in Figure 1.
In this LCD television receiver 100 shown in Figure 1, be connected to the fuselage 120 of receiver via plug-socket connector 110 according to the earphone antenna 10 of the embodiment of the invention.
As shown in Figure 2, plug-socket connector 110 is made up of five electrode plug 110A and jack 110B, and antenna (Ant), headphone detect (detect), audio frequency L sound channel (L), audio frequency R sound channel (R) and ground (Gnd) five kinds of circuits and be connected respectively to jack 110B.
As shown in Figure 3, in the fuselage 120 of receiver, the video signal processing unit 123 that have tuner unit 121, the IF signal processing unit 122 that is connected with tuner 121, all is connected and audio signal processing unit 125, the liquid crystal display 124 that is connected with video signal processing unit 123 and the jack 110B that forms above-mentioned plug-socket connector 110 with IF signal processing unit 122.
In this LCD television receiver 100, as shown in Figure 2, above-mentioned jack 110B has 1,2,5,6,7 and two stiff ends 3,4 of five movable end, wherein, as shown in Figure 3, movable end 7 is connected to the antenna end (Ant) of tuner unit 121, and movable end 1 is connected to the ground of tuner unit 121, in addition, movable end 2,5 is connected to audio signal processing unit 125 as audio frequency L sound channel end (L) and audio frequency R sound channel end (R).Movable end 6 is connected to the GND of the substrate in the wireless device fuselage, as the common ground end (Gnd) of wireless device.Stiff end 3,4 is used for locking-type plug firmly.The shielded type cable 20 that earphone antenna 10 is connected with the fuselage 120 of receiver via five plug-socket connectors 110 by an end, the contiguous block 30 that is connected with the other end of shielded type cable 20 are formed with the stereophone 40L, the 40R that are connected with contiguous block 30 via two headphone cable 41,42.
As shown in Figure 4, shielded type cable 20 is by forming as lower member: coaxial cable 24, and it has the center conductor 21 that transmits high-frequency signal, is coated with insulator 22 on the center conductor 21, also is coated with shielding conductor 23 on this; Be used for holding wire 25L, the 25R of audio signal, they are insulated coating; With earth connection 25C, wherein, be coated with shielding conductor 27 in the outside of these parts, shielding conductor 27 has the structure of twining with soft copper on the insulating trip of being made by paper or polyethylene sheets 26, perhaps have braiding structure.
Then, at an end of this shielded type cable 20, have five electrode plug 110A, it is connected to center conductor 21 and its shielding conductor 23, the holding wire 25L, the 25R that are used for audio signal and the earth connection 25C of coaxial cable 24.In addition, at the other end of shielded type cable 20, have contiguous block 30, it is connected to center conductor 21, its shielding conductor 23, the holding wire 25L, the 25R that are used for audio signal, earth connection 25C and shielding conductor 27.
Here, be connected to aforesaid contiguous block 30 though cover the shielding conductor 27 of coaxial cable 24, audio signal wire 25L, 25R and earth connection 25C, and be free of attachment to aforesaid plug 110A.
As shown in Figure 5, contiguous block 30 has substrate 34, is formed with grounding pattern 31 in the central on substrate 34; Be used for transmission line pattern 32L, the 32R of stereo audio signal, they are arranged on the both sides of grounding pattern 31; Three terminal pad 33L, 33R, 33C are arranged on the upper rim towards grounding pattern 31; The the 4th and the 5th terminal pad 33D, 33E are arranged on a side of the grounding pattern 31 on substrate.
In this contiguous block 30, the marginal portion that is used for transmission line pattern 32L, the 32R of stereo audio signal is connected to the first and second terminal pad 33L, the 33R of three terminal pad 33L, 33R, 33C via high frequency choke coil 35L, 35R.In addition, grounding pattern 31 is connected to the 3rd terminal pad 33C among three terminal pad 33L, 33R, the 33C via high frequency choke coil 35C.In addition, the first terminal pad 33L is connected via chip capacitor 36L with the 3rd terminal pad 33C.The second terminal pad 33R is connected via chip capacitor 36R with the 3rd terminal pad 33C.In addition, the 3rd terminal pad 33C is connected via chip capacitor 36 with the 4th terminal pad 33D.In addition, the balance/imbalance converter (balun) 37 that is used to carry out impedance and balance/imbalance mode switch has been installed, it is connected to the 4th terminal pad 33D, grounding pattern 31 and the 5th terminal pad 33E.In the mode of example, balance/imbalance converter 37 is configured to make that an end of its balance side is connected to the 4th terminal pad 33D, and the other end of balance side is connected to the 5th terminal pad 33E, and an end of its uneven side is connected to grounding pattern 31.
Then, in this contiguous block 30, comprise that two signal line 41A, 41B are used for earphone 40L to the left and provide the left side headphone cable 41 of left side audio signal to be connected to the first terminal pad 31L and the 3rd terminal pad 33C, in addition, comprise and are used for two signal line 42A, 42B to the right earphone 40R provides the right side headphone cable 42 of right audio signal to be connected to the second terminal pad 33R and the 3rd terminal pad 33C.
Aforementioned shielded type cable 20 also is connected to this contiguous block 30 in the following manner.
That is, the left side audio signal wire 25L of shielded type cable 20 and right audio signal line 25R are connected to be formed on and are used for transmission of audio signals line pattern 32L and 32R on the substrate 34, and its earth connection 25C also is connected to grounding pattern 31.In addition, the center conductor 21 and the shielding conductor 23 that constitute the axial arrangement of shielded type cable 20 are installed on the grounding pattern 31, wherein shielding conductor 23 is connected to grounding pattern 31 then, and an end of center conductor is connected to the other end of the uneven side of balance/imbalance converter 37.In addition, shielding conductor 27 is connected to the 5th terminal pad 33E.
Here, according to a preferred embodiment of the invention, for example, the BLM18HD102SN1 that uses Murata Manufacturing Co., Ltd to produce, the ferrite bean of model 1608 is as aforesaid high frequency choke coil 35L, 35R, 35C.Use high frequency choke coil 35L, 35R, the 35C of this ferrite bean that the audio signal in the frequency range that is lower than 20kHz is become Low ESR, and be high impedance, therefore stoped passing through of high-frequency signal high-frequency signal.In addition, use respectively electric capacity as the chip capacitor of 10pF as chip capacitor 36L, 36R, 36C, pass through to stop audio signal thereby the audio signal in the frequency range that is lower than 20kHz is become high impedance, and high-frequency signal become Low ESR.
Shown in the electric wiring plan among Fig. 6, this earphone antenna 10 has been drawn headphone cable 41,42, be used for the loud speaker 40L of audio signal transmission to stereophone, 40R, every headphone cable 41 wherein, 42 all are made up of two signal line in each side: left side line 41A and GND 41B/ right-hand line 42A and GND 42B, then for audio signal and high-frequency signal are separated, in the importation of audio signal and the part that is connected to ground, be the 33L of terminal pad, 33R, the 33C part, the high-frequency electric wave choke 35L that uses ferrite bean is provided, 35R, 35C, become high impedance (1k Ω or bigger) in the frequency range that these high-frequency electric wave chokes use in television broadcasting, and in tonal range (less than 20kHz), become Low ESR, thus audio signal and high-frequency signal are separated.
Promptly, because headphone cable 41,42 (each all comprises two signal line 41A, 41B/42A, 42B in each side) is connected to center conductor 21 as coaxial cable 23 holding wires with the high frequency form, therefore, for with audio signal from wherein separating, chip capacitor 36L, the 36R, 36 that are configured as via 10pF are connected between terminal pad 33L, 33R, 33D, the 33E, so that the Signal Separation in the audiorange is come out, and in RF signal (frequency range of TV wave band), connect.
Here, being assigned to frequency band that television broadcasting uses in Japan is 90M to 108MHz (1～3 channel) and 170M to 222MHz (4～12 channel) in the VHF wave band, and the 470M to 770MHz of UHF wave band (13～62 channel).
Therefore, in this earphone antenna 10, be connected to axial cable 24 by shielding conductor 27 via balance/imbalance converter 37 with headphone cable 41,42 and covering shielded type cable 20, headphone cable 41,42 and shielding conductor 27 are configured to as the antenna that has in the dipole antenna structure of its line length place resonance, and they each length is adjusted, so that can receive the 100MHz in the VHF wave band.
In earphone antenna 10 according to this embodiment of the invention, the characteristic impedance of coaxial cable 24 is set to 75 Ω, and the length of shielded type cable 20 is 70cm, and the length of headphone cable 41,42 is 50cm, and it is adjusted to the resonance at the 100MHz place.In 200MHz, it is configured to and can receives as 1 λ antenna.In UHF, it is configured to use the harmonic oscillation (triple-frequency harmonics, quintuple harmonics, the seventh harmonic) of 100MHz and 200MHz.
Because its dipolar configuration, be stabilized according to the earphone antenna 10 of the embodiment of the invention and be antenna, and can add various functions to contiguous block 30.
For example, for portable phone, as shown in Figure 7, by realizing having the circuit arrangement of microphone 12 and switch 13, it can increase the function of microphone 12, and can not reduce antenna gain.Equally, in mode shown in Figure 8, by increasing amplifier 14, it can place amplifier 14 near antenna, makes as a system, and NF (noise factor) obtains to improve greatly.
Here, in above-mentioned earphone antenna 10, the length of two headphone cable 41,42 is set to equate, still, also two headphone cable, 41,42 each terminal pad 33L, 33R, 33C in contiguous block 30 can be changed to the length of earphone 40L, 40R, so that can corresponding different frequency.
Perhaps, shown in earphone antenna 10A among Fig. 9, by (for example in one of two headphone cable 41,42, the headphone cable 41 that is used for the left side audio signal) inserts high frequency choke coil (ferrite bean) 35A, 35B in the way part, it can be configured to the separation high-frequency signal, to shorten its resonance length.In earphone antenna 10A shown in Figure 9, it is set to make a resonance length in the earphone antenna 41 is 250mm, and the resonance length in another earphone antenna 42 is 400mm, and the characteristic impedance of coaxial cable 21 is 75 Ω, and the length of shielded type cable 20 is 600mm.In the mode of example, in this earphone antenna 10A, other assemblies are identical with aforementioned earphone antenna 10, therefore, identical assembly use with Fig. 9 in identical symbol and numeral, and omitted detailed description to them.
In addition, the present invention also can be applied to use the situation of the mono headset of single headphone cable.
It should be appreciated by those skilled in the art, depend on design requirement and other factors, in the scope of claims or its equivalent, can make various modifications, combination, sub-portfolio and change.
The theme that the present invention comprises relates to Japanese patent application No.JP2004-123465 and the No.JP2005-030906 that submits to Japan Patent office respectively on April 19th, 2004 and on February 7th, 2005, and their full content is incorporated herein by reference.
Claims (5)
1. earphone antenna comprises:
Headphone cable comprises a pair of first holding wire, and described first holding wire is insulated coating, is used for providing audio signal to earphone;
Shielded type cable, the secondary signal line and the earth connection that are used for audio signal that comprise coaxial cable and be insulated coating, wherein said coaxial cable has center conductor, described center conductor transmits high-frequency signal, be coated with insulator, and be coated with first shielding conductor, and the outside of described coaxial cable, secondary signal line and earth connection is coated with the secondary shielding line via insulating material, and an end of described shielded type cable is connected to the fuselage of wireless device via multi-plug connector; With
Contiguous block, described contiguous block is connected to described headphone cable with the other end of described shielded type cable,
Wherein, in described contiguous block, described secondary signal line by will being used for audio signal and described earth connection are connected to described a pair of first holding wire of described headphone cable separately via high frequency choke coil corresponding signal line, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, and the uneven part that described first shielding conductor of the described center conductor of described coaxial cable and described coaxial cable is connected to balance/imbalance converter, described a pair of first holding wire of described headphone cable is connected respectively to an end of the balance portion of described balance/imbalance converter via capacitor, and the other end of the described balance portion of described balance/imbalance converter is connected to the described secondary shielding line that covers described coaxial cable and described secondary signal line outside, thereby utilize the described secondary shielding line of described headphone cable and described coaxial cable of covering and described secondary signal line outside to dispose dipole antenna together, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the described frequency range of described audio signal, and becomes Low ESR in the described frequency range of described high-frequency signal.
2. earphone antenna according to claim 1, wherein, stereophone is connected to described contiguous block via a pair of described headphone cable, and high frequency choke coil is inserted in the way of one or two described headphone cable in the part, so that make the resonance frequency difference between the described headphone cable, perhaps make resonance frequency variable.
3. earphone antenna according to claim 1, wherein, the switch that microphone is installed on described contiguous block and is used to switch.
4. earphone antenna according to claim 1 wherein, is equipped with amplifier on described contiguous block.
5. portable radio device comprises:
The fuselage of wireless device is equipped with the multitap jack, and described multitap jack is connected to tuner and audio signal output unit; With
Earphone antenna, described earphone antenna comprises: headphone cable, comprise a pair of first holding wire, described first holding wire is insulated to be coated with to be applied to earphone provides audio signal; Shielded type cable, the secondary signal line and the earth connection that are used for audio signal that comprise coaxial cable and be insulated coating, wherein said coaxial cable has center conductor, described center conductor transmits high-frequency signal, be coated with insulator, and be coated with first shielding conductor, and the outside of described coaxial cable, secondary signal line and earth connection is coated with the secondary shielding line via insulating material, and an end of described shielded type cable is connected to the fuselage of wireless device via multi-plug connector; And contiguous block, described contiguous block is connected to described headphone cable with the other end of described shielded type cable,
Wherein, described earphone antenna is formed and makes in described contiguous block, described secondary signal line by will being used for audio signal and described earth connection are connected to described a pair of first holding wire of described headphone cable separately via high frequency choke coil corresponding signal line, form the audio signal transmission path, wherein said high frequency choke coil becomes Low ESR in the frequency range of audio signal, and in the frequency range of high-frequency signal, become high impedance, and the uneven part that described first shielding conductor of the described center conductor of described coaxial cable and described coaxial cable is connected to balance/imbalance converter, described a pair of first holding wire of described headphone cable is connected respectively to an end of the balance portion of described balance/imbalance converter via capacitor, and the other end of the described balance portion of described balance/imbalance converter is connected to the described secondary shielding line that covers described coaxial cable and described secondary signal line outside, thereby utilize the described secondary shielding line of described headphone cable and described coaxial cable of covering and described secondary signal line outside to dispose dipole antenna together, wherein said balance/imbalance converter is used to carry out impedance and balance/imbalance mode switch, described capacitor becomes high impedance in the described frequency range of described audio signal, and becomes Low ESR in the described frequency range of described high-frequency signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004123465 | 2004-04-19 | ||
| JP123465/2004 | 2004-04-19 | ||
| JP030906/2005 | 2005-02-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1691411A CN1691411A (en) | 2005-11-02 |
| CN100452531C true CN100452531C (en) | 2009-01-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510064714XA Expired - Fee Related CN100452531C (en) | 2004-04-19 | 2005-04-18 | Earphone antenna and portable radio equipment provided with earphone antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100452531C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1845583A1 (en) * | 2005-02-02 | 2007-10-17 | Matsushita Electric Industrial Co., Ltd. | Antenna device of connection cable integrated type, and radio device |
| JP4904895B2 (en) * | 2006-04-12 | 2012-03-28 | ソニー株式会社 | Antenna device |
| JP4962106B2 (en) * | 2007-04-11 | 2012-06-27 | ソニー株式会社 | Antenna cable |
| US20090325633A1 (en) * | 2008-06-30 | 2009-12-31 | Sony Ericsson Mobile Communications Ab | Method for reducing a disturbance in an output signal caused by a disturbing signal in a multiport connector, multiport connector circuit, and mobile device |
| CN102610914B (en) * | 2012-03-30 | 2015-03-11 | 上海华勤通讯技术有限公司 | China Mobile Multimedia Broadcasting (CMMB) antenna |
| CN104022351B (en) * | 2013-02-28 | 2017-06-13 | 上海德门电子科技有限公司 | A kind of band Earphone joint digital TV antenna |
| CN104183914B (en) * | 2013-05-21 | 2017-05-10 | 宝德科技股份有限公司 | Wireless headphone and antenna for wireless headphone |
| JP6296669B1 (en) * | 2016-10-18 | 2018-03-20 | 株式会社オーディオテクニカ | Digitally driven headphones |
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|---|---|---|---|---|
| US3720874A (en) * | 1971-11-08 | 1973-03-13 | Motorola Inc | Dipole antenna arrangement for radio with separate speaker-microphone assembly |
| US5361405A (en) * | 1989-09-14 | 1994-11-01 | Ramsey Electronics, Inc. | Aircraft band radio receiver which does not radiate interfering signals |
| JP2002017426A (en) * | 2000-07-05 | 2002-01-22 | Kato Works Co Ltd | Neck strap for cellular phone |
| WO2003026342A2 (en) * | 2001-09-17 | 2003-03-27 | Roke Manor Research Limited | A headphone |
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2005
- 2005-04-18 CN CNB200510064714XA patent/CN100452531C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3720874A (en) * | 1971-11-08 | 1973-03-13 | Motorola Inc | Dipole antenna arrangement for radio with separate speaker-microphone assembly |
| US5361405A (en) * | 1989-09-14 | 1994-11-01 | Ramsey Electronics, Inc. | Aircraft band radio receiver which does not radiate interfering signals |
| JP2002017426A (en) * | 2000-07-05 | 2002-01-22 | Kato Works Co Ltd | Neck strap for cellular phone |
| WO2003026342A2 (en) * | 2001-09-17 | 2003-03-27 | Roke Manor Research Limited | A headphone |
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| Publication number | Publication date |
|---|---|
| CN1691411A (en) | 2005-11-02 |
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Granted publication date: 20090114 |