WO2004080112A2 - イヤーホーンアンテナ及びそれを備えた無線機 - Google Patents
イヤーホーンアンテナ及びそれを備えた無線機 Download PDFInfo
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- WO2004080112A2 WO2004080112A2 PCT/JP2004/001484 JP2004001484W WO2004080112A2 WO 2004080112 A2 WO2004080112 A2 WO 2004080112A2 JP 2004001484 W JP2004001484 W JP 2004001484W WO 2004080112 A2 WO2004080112 A2 WO 2004080112A2
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- Prior art keywords
- audio
- frequency
- pair
- earphone
- frequency signal
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
- H01Q1/46—Electric supply lines or communication lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/07—Applications of wireless loudspeakers or wireless microphones
Definitions
- the present invention relates to a so-called earphone antenna which is connected to a wireless device and reproduces (sounds) the sound of the wireless device, wherein the earphone code is used not only as a sound transmission but also as an antenna.
- a earphone antenna that can obtain high reception sensitivity over a wide frequency band without performing the degree adjustment operation or the reception frequency switching operation and that is not adversely affected by the human body through the earphone.
- the present invention relates to a radio equipped with the earphone antenna. Background art
- Radio antennas that receive high-frequency radio waves such as those that use earphones as they are, or those that have conductor wires placed inside the housing of the radio, have been used in the past. It is difficult to obtain sensitivity, and for this reason, for example, a loop antenna introduced in Japanese Patent Application Laid-Open No. 10-84209 was developed. This type of antenna has a loop antenna attached to the necklace of a small radio, and an inductance element connected to the loop antenna in parallel so that the opening of the loop antenna is perpendicular to the surface of the human body. It is.
- the conventional earphone antenna which integrates a signal line for transmitting audio signals to the earphone and an antenna, has a significant effect on the radio through the antenna because the earphone directly contacts the human body.
- the stability of reception was greatly impaired.
- a so-called portable liquid crystal TV needs to receive a very wide band high frequency signal of 90 to 770 MHz.
- the frequency band used for television broadcasting in Japan in the VHF band, 90 to 108 MHz (1 to 3 cH) and 170 to 222 MHz (4 to The frequency used is 12 cH), and in the UHF band, the frequency used is 470-770 MHz (13-62 cH).
- the antenna length is the antenna length, for example, the loop length in the case of a loop antenna. This is because the wave number band is determined, and the reception sensitivity of the antenna decreases for frequencies outside the band.
- a sensitivity adjusting means for providing, for example, a sensitivity adjusting member through which a magnetic material is movably provided, and adjusting the amount of transmission of the magnetic material according to a frequency to be received.
- a sensitivity adjustment method it is necessary to perform a sensitivity adjustment operation every time the frequency to be received is switched.
- the present invention has been made in order to solve such a problem, and can eliminate a high-frequency adverse effect from the human body to the radio device through the earphone.
- one end of a pair of audio / high-frequency signal lines is connected to one terminal on the balanced mode side of the balun, and the other pair of audio / high-frequency signal lines is connected to the other terminal on the balanced mode side.
- the other end is connected, the pair of voice
- the dual-purpose signal line is a one-horn antenna connected to the left earphone unit in one part and to the right earphone unit in the other part.
- the audio / high-frequency signal line functions as a receiving loop antenna.
- the portion from the balun of the pair of audio / high-frequency signal lines to the portion where the left and right earphone units are connected is as described above. It is characterized in that it functions as means for transmitting audio signals to the left and right microphones.
- the balun converts the mode from the balanced mode to the unbalanced mode, and furthermore, the two pairs of voice and high-frequency signal lines are used for the high-frequency signal. Since it functions as a receiving loop antenna and functions as an audio signal transmitting means for an audio signal, it is possible to integrate the high-frequency receiving antenna and the earphone.
- a wireless device is characterized by comprising: the balun according to the first aspect; and a receiving device connected to an unbalanced terminal of the balun of the earphone antenna via a cable.
- the wireless device of the fourth aspect since the earphone antenna of the first aspect is used, the advantage of the earphone antenna can be enjoyed.
- the terminals on the opposite balun side of the audio / high-frequency signal lines of each pair are connected to each other by a pair of conductor wires via each other pair of open coil pairs, and the loading coil pairs are connected to each other.
- An antenna connected to the left and right earphones via the antenna, wherein each of the loading coils includes a specific frequency signal (for example, 200 MHz) higher than a preset basic frequency (for example, 100 MHz).
- the impedance becomes high impedance and is separated from the two pairs of voice and high-frequency signal lines in high frequency, and the signal lines are made to function as a dipole antenna.
- the fundamental frequency for example, 100 MHz For the signal of z
- the two pairs of voice and high-frequency signal lines are connected and connected to each of the above-mentioned leading coils in a high-frequency manner with a single-pole impedance, and a loop is formed by both of them and the above-mentioned conductor wires.
- the antenna is made to function, and the pair of sound and high frequency signal lines function as sound signal transmitting means for sound signals to the left and right earphone units. It is characterized.
- the high-frequency signal can be mode-converted from the balanced mode to the unbalanced mode by the balun, and the frequency is higher than the fundamental frequency (for example, 100 MHz).
- the reading coil becomes a high impedance and separates from the above two pairs of audio and high frequency signal lines, and the two pairs of audio and high frequency dual use.
- the signal line can function as a dipole antenna and resonate.
- the above-mentioned speech coil becomes a speech impedance, and the two pairs of voice and high-frequency signal lines and the respective speech signals connected thereto are connected.
- the conductor wire connecting the loading coil and its loading coil can function as a single loop antenna to resonate.
- the fundamental frequency for example, 100 MHz
- its harmonics the third harmonic, for example, 300 MHz, the fifth harmonic, for example, 50 OMHz, the seventh harmonic, for example, 700,000
- a loop antenna that resonates with a signal of a specific frequency (for example, 200 MHz) higher than a preset frequency (for example, 100 MHz)
- its harmonics third harmonic,
- a dipole antenna that excites at 600 MHz is the two pairs of voice and high frequency Consisting of signal lines, it is possible to obtain sensitivity characteristics with a relatively small change in reception sensitivity over a wide frequency band, and no sensitivity adjustment for the horn antenna is required to obtain the sensitivity characteristics .
- the loading coil shortens the antenna length required for resonance at the fundamental frequency (for example, 100 MHz), even if the antenna length is short, it can resonate with a signal having a long wavelength.
- the reception sensitivity to low frequency signals can be increased without lengthening. This is another advantage that cannot be ignored.
- the audio signal of each pair and the high frequency shared signal line and the loading coil are transmitted to the left and right earphone units. Since the antenna functions as a transmission means, the earphone and the antenna can be integrated. Therefore, the antenna can be used for receiving a high-frequency signal over a wide frequency band, and can also be used as a means for transmitting an audio signal to a horn unit. It can be embodied.
- a wireless device is a radio antenna according to claim 5, 6, 7, 8, 9, 10, 11, or 12, and a terminal on the unbalanced mode side of the balun. And a receiving device connected to the receiving device.
- the advantages of the earphone antenna according to the fifth, sixth, seventh, eighth, ninth, tenth, tenth, and twelve aspects can be enjoyed.
- FIGS. 1A to 1B show a first embodiment of the earphone antenna of the present invention.
- FIG. 1A is a diagram showing the basic configuration
- FIG. 1B is an equivalent circuit diagram of the antenna. .
- FIG. 2A to 2C show:-The different components used for the earphone antenna, Figure 2A shows the pin jack connector, Figure 2B shows the configuration of the coaxial cable, FIG. 2C is a configuration diagram of the composite coil.
- FIG. 3 is a curve diagram showing the relationship between the frequency and the inductance of the loading coil used in the above embodiment.
- FIG. 4 is a curve diagram showing the relationship between the frequency of the loading coil used in the first embodiment and the insertion loss.
- FIG. 5A to 5B show a second embodiment of the earphone antenna of the present invention.
- FIG. 5A is a configuration diagram
- FIG. 5B is a circuit diagram.
- FIG. 6A to 6B show a third embodiment of the earphone antenna of the present invention.
- FIG. 6A is a configuration diagram
- FIG. 6B is a circuit diagram.
- the earphone antenna of the present invention basically, one end of a pair of voice / high-frequency signal lines is connected to one terminal on the balanced mode side of the paran, and the pair of voices is connected to the other terminal on the balanced mode side. The other end of the high-frequency signal line is connected to the pair of voices.
- the high-frequency signal line is partially connected to the left horn unit and the other part to the right horn unit.
- the pair of voice and high-frequency signal lines function as a receiving loop antenna.
- the baluns of the pair of voice and high-frequency signal lines separate the left and right speaker units from the balun.
- the part to be connected is the above left It is designed to function as a means for transmitting audio signals to the right earphone unit.
- the loop length of the pair of audio / high-frequency signal lines may be set to about 65 cm. This is because a loop antenna that can receive high-frequency signals in all UHF bands that are broadcasted by digital terrestrial broadcasting can be configured, and audio signals can be transmitted without any trouble. Since a pair of audio / high-frequency signal lines are formed in a loop, a paran can be easily applied to a neck-hanging configuration. However, if the loop length is about 65 cm, it may be difficult for some people to pass through the head, so a detachable connector is interposed on a part of a pair of audio and high-frequency signal lines, and it is hung on the neck. The connector may be detached at the time of removal from the neck or at the time of the neck, and may be connected with the connector at the time of hanging or removing the connector so that the audio / high-frequency signal line can be returned to a loop shape.
- high impedance is provided for high-frequency signals (for example, UHF waves), and the high-frequency signals are cut off.
- high-frequency cutoff means for example, an inductance element (coil)
- inductance element coil
- a voice cutoff unit for example, a capacitor at a position farther from the balanced side terminal of the balun than the connection point between the pair of voice / high-frequency signal lines and the left and right earphone units. This prevents sound signals to be transmitted to the left and right horn units from leaking to the conductor. This is because it is possible to reduce the decrease in the audio signal level in the earphone.
- the balun and two pairs of audio and high-frequency signal lines connected to the left and right earphone units must be A pair of left and right loading coils and a conductor wire connecting between the left and right loading coils are used as a horn antenna.
- the mouthing coil becomes high impedance or mouth impedance according to the difference in frequency band. It functions as a dipole antenna that resonates with a high-frequency signal of (200 MHz), and the pair of loading coil and conductor wire added to the two pairs of voice and high-frequency signal lines corresponds to the fundamental frequency (1). It functions as a loop antenna that resonates at 0 MHz.
- the pair of audio and high frequency shared signal lines are connected to each other at high frequency, and thus one of the pair of high frequency shared signal lines corresponding to the left earphone unit and A single loop antenna including the other of the pair, a pair of audio signals corresponding to the right earphone unit and the high-frequency combined signal line, and the other of the pair and a conductor line may be configured. Good. In this case, substantially the entire circumference of the loop antenna is doubled, and the receiving frequency band can be lowered.
- a high-frequency cutoff means for example, a ferrite bead (or a choke coil) is provided between each pair of voice and high-frequency signal lines of the loading coil and each of the earphone units.
- Receiving It is preferable to prevent any adverse effect on the surface. This is because the stability of reception can be improved.
- a band-expansion capacitor may be connected between each of the left and right pairs of audio / high-frequency signal lines. As a result, the reception frequency band can be expanded.
- a high-frequency cutoff means for example, a ferrite bead (choke coil), which has a high impedance with respect to the high-frequency signal, is interposed in an audio signal transmission path for transmitting the audio signal to each pair of audio and high-frequency signal lines of the earphone antenna.
- a high-frequency cutoff means for example, a ferrite bead (choke coil), which has a high impedance with respect to the high-frequency signal, is interposed in an audio signal transmission path for transmitting the audio signal to each pair of audio and high-frequency signal lines of the earphone antenna.
- each of the left and right pair of loading coils may be composed of separate and independent components. However, doing so increases the area occupied by the loading coil and, consequently, the loading coil provided with it, which may lead to an increase in the size and weight of the earphone antenna. Therefore, in order to avoid an increase in size, etc., each pair of mouthing coils is composed of a composite coil in which multiple coils consisting of two windings sharing one core are provided integrally. It may be provided.
- the horn antenna of the present invention transmits a high-frequency signal to a receiving device of a wireless device distant from the receiving device and receives an audio signal from the receiving device, coaxial transmission and reception of the high-frequency signal and the audio signal with the receiving device are performed. It is preferable to use a cable from the viewpoints of preventing noise intrusion and improving reception stability. And, as the coaxial cable, a center conductor through which a high-frequency signal passes, an insulator surrounding the center conductor, a shield wire surrounding the insulator, an insulator surrounding the shield wire, and an insulator It is preferable to use one in which left and right audio signal lines are provided outside.
- left and right audio may be transmitted by a pair of audio signal lines and the above-mentioned shield line, but in addition to the pair of audio signal lines, a common audio signal line is wound around the outside of the second insulator, Left and right audio signals may be transmitted by these three signal lines.
- Each signal line may be made of a plurality of wires so as to have conductivity and mechanical flexibility (flexibility), and, for example, soft copper and litz wire are suitable as the material.
- the two pairs of audio / high-frequency signal lines may be configured such that the portions connected to the balun form an angle of approximately 180 ° with each other.
- the two pairs of voice / high-frequency signal lines function as a U-type dipole antenna for the signal of the specific frequency (for example, 200 MHz).
- the angle may be smaller than about 180 °.
- the two pairs of voice / high-frequency signal lines function as a V-type dipole antenna for the signal of the specific frequency (for example, 200 MHz).
- the present invention can be implemented in various modes.
- FIG. 1A to 1B show a first embodiment 2 of the earphone antenna of the present invention.
- FIG. 1A is a diagram showing the basic configuration
- FIG. 1B is an equivalent circuit diagram of the antenna.
- is there. 2A to 2C show different members used for the earphone antenna
- FIG. 2A shows a pin jack connector
- FIG. 2B shows a configuration diagram of a coaxial cable
- FIG. Figure C is a configuration diagram of the composite coil.
- reference numeral 2 denotes a speakerphone antenna (first embodiment 2 of the earphone antenna of the present invention), which is a matching box 6 for accommodating a balun 4 and the like, and a voice connected to a balanced terminal of the balun 4.
- High-frequency signal lines 8La, 8Lb, 8Ra, 8Rb It consists of a pair of connected loading boxes 10L, 10R and a pair of conductor wires 20a, 20b connecting between the loading boxes 10L, 10R.
- the audio of the loading box 10 L, 10 R ⁇ High frequency signal line 8 La, 8 Lb, 8 Ra, 8 Rb 2 and conductor wires 20 &, 20b are connected.
- the audio / high-frequency signal lines 8La, 8Lb, 8Ra, 8Rb and the conductor wires 20a, 20b are based on a plurality of wires having conductivity and mechanical flexibility. Made of soft copper, for example.
- the base wire may use a litz wire, each of which is insulated.
- the pair of conductor wires 20a and 2Ob are both set to about 40 cm.
- the balun 4 converts the mode from the balanced mode to the non-balanced mode and converts the impedance.
- the impedance is converted from the balanced 200 ⁇ to the unbalanced 75 ⁇ .
- One of the terminals on the balanced mode side of the balun 4 has a left audio / high frequency shared signal line 8La, 8Lb on the other side and a right audio / high frequency shared signal line 8Ra, 8Rb on the other side. , extends from the balanced terminals to 5 cm is fixed above 3 0 ° to each other an angle of the balun 4 (9 0 0 in this example), it is connected so that it can function as a V-type dipole antenna.
- the part constituting this V-shaped dipole antenna is processed to have relatively high rigidity so as to maintain the V-shape.
- the length from the balun 4 to the impedance box 10 L-.1 OR (one-sided antenna length) is, for example, 37 cm or more.
- one side is composed of two signal lines (8L a ⁇ 8L b for the left side and 8R a, 8R b for the right side) because these earphone codes, that is, voice and high frequency
- the dual-purpose signal lines 8 La, 8 Lb, 8 Ra, and 8 Rb not only function as high-frequency signal receiving antennas, but also transmit audio signals to the left and right earphone units 12 L and 12 R. This is to make it function also as an audio signal transmitting means.
- a capacitor C 3 L In order to extend the frequency band as a receiving antenna (loop antenna) to the lower side, a capacitor C 3 L must be connected between the voice and high-frequency signal lines 8 La and 8 Lb and between 8 Ra and 8 Rb. , C 3 R may be connected.
- auxiliary antennas 8Lc and 8Rc may be provided to supplement the characteristics.
- the auxiliary antennas 8Lc and 8Rc have a length of, for example, 50 mm and are provided at least 5 mm away from the audio / high-frequency signal lines 8La, 8Lb, 8La, and 8Lb. Is preferred.
- the signal lines 8La, 8Lb, 8Ra, 8Rb (and 8Lc, 8Rc) of the size and shape shown in FIG. 1A are high frequency of 200 MHz. It functions as a V-type dipole antenna that resonates with a signal and excites its harmonics (3rd harmonic, 5th harmonic, 7th harmonic).
- the terminal on the unbalanced mode side of the balun 4 is connected to a receiver, for example, a liquid crystal TV (television receiver) 16 via a coaxial cable 14.
- a receiver for example, a liquid crystal TV (television receiver) 16
- the connection between the coaxial cable 14 and the liquid crystal TV 16 is performed using a pin jack connector 24 having a pin arrangement shown in FIG. 2A.
- the coaxial cable 14 is a coaxial integrated cable in which a signal line for a high-frequency signal and a signal line for an audio signal are integrated. Transmits left and right audio signals.
- the signal line for high-frequency signals and the signal line for audio signals must be —Transmission in bulls is not essential. Although transmission may be performed using separate cables, it is better to transmit high-frequency signals and audio signals using a single coaxial cape. This can be said to be preferable because it can reduce the weight and cost.
- the coaxial cable 14 connects the earphone antenna 2 to a wireless device, for example, a receiving circuit (receiving device) 19 of a liquid crystal TV 16 (television receiver) body. It has a structure as shown in the figure.
- the coaxial cable 14 has a center conductor 31 through which a high-frequency signal passes as a core wire, the center conductor 31 is covered with an insulator 32, and the insulator 32 is shielded (for example, from bare soft copper wire). 3)
- the shielded wire 33 is wound from the outside with, for example, a tape 34 and covered, and the three audio signal wires 35 a are insulated and separated from each other on the outside of the tape 34. , 35b, and 35c, and the outside is covered with an insulating jacket 36.
- One of the three audio signal lines 35a, 35b, and 35c is a left audio signal line, the other is a right audio signal line, and the other is a common audio signal line (ground line).
- the common audio signal line is made to play, and the audio signal is transmitted through the left and right audio signal lines and the shield line.
- the left and right loading boxes 10L and 10R are for audio and high-frequency signal lines 8La'8Lb and 8Ra'8Rb, respectively, and the left and right horn units 1 2 It is connected between L, 12 and conductor wires 20 &, 2 Ob.
- the loading box 10L is provided with a loading coil LLa, LLb as shown in FIG. 2C, and a high-frequency cut-off means having one end connected to the loading coil LLa, LLb.
- Ferrite beads F 1 L a, F l L b and one end of the loading coil LL a, LL b Have capacitors C4La and C4Lb, which serve as audio signal cutoff means.
- the other ends of the ferrite peas F1La and F1Lb are connected to the left channel unit 12L.
- the loading box 10 R is composed of a loading coil LRa, LRb and one end connected to the loading coil LRa, LRb. And capacitors C 4 R a and C 4 R b forming an audio signal cut-off means having one end connected to the loading coils LR a and LR b.
- the other ends of the ferrite beads F1Ra and FIRb are connected to the left earphone unit 12R.
- the above ferrite beads F1La, FlLb, FlRa, FlRb (for example, BLM18HD102SN1 size 1608 from Murata Manufacturing) are 20 kHz. It becomes low impedance for the audio signal of the following band, and the audio signal between the mouthing coils LL a, LL b, LR a, LR b and the jaw horn units 12 L, 12 R Allow transmission.
- high-frequency signals become high impedance (for example, 1 kHz) and cut off (cut) the signals in between. Therefore, the high-frequency signal is transmitted from the human body to the receiving circuit 19 via the earphone units 12L and 12R and the voice and high-frequency signal lines 8La, 8Lb, 8Ra and 8Rb. It is possible to prevent intrusion into the Internet and impair the stability of reception.
- the other ends of the capacitors C4La and C4Lb are connected to the other ends of the capacitors C4Ra and C4Rb through conductor wires 20a and 20b.
- the capacitors C 4 La, C 4 Lb, C 4 R a, and C 4 R b block the audio signal, and the audio signal to be sent to the earphone unit is a conductor line 20 a, 2 It serves to prevent leakage to 0b. However, it allows high-frequency signals to pass through.
- the capacitance is, for example, 1 O pF.
- the inductance of each of the loading coils LLa, LLb, LRa, and LRb has a frequency dependency as shown in FIG. 3, for example, and is approximately 3.OH at 100 MHz. is there.
- the insertion loss is maximized at 200 MHz.
- 18 L and 18 R are audio signal transmission lines via ferrite beads F 2 LA and F 2 RA (for example, BLM 18 HD 1 0 2 31 ⁇ 1 size 16 0 8 manufactured by Murata Manufacturing Co., Ltd.) as high-frequency cutoff means. Connected to the high frequency signal line 8La, 8Ra.
- the audio / high-frequency signal lines 8 Lb and 8 Rb are grounded via ferrite beads F 2 L C and F 2 R C having the same characteristics as the above ferrite beads F 2 L A and F 2 R A.
- the ferrite beads F2LA, F2RA, F2LC, and F2RC prevent high-frequency signals from leaking into the audio signal path, and have high impedance in the frequency band of television broadcast signals (eg, (1 k ⁇ or more), and cut off high-frequency signals. In the audio signal frequency band (20 kHz or less), the impedance becomes low to allow the passage of audio signals.
- C 1 L and C 1 R are audio and high-frequency signal lines 8 La, 8 Ra and a common audio signal line (ground)
- the left and right audio signals are separated from their respective common audio signal lines (ground lines) by a separation capacitor (capacity is, for example, 10 pF), enabling the earphone coil to operate. It is for.
- C 3 L and C 3 R are bandwidth expansion capacitors connected between audio and high-frequency signal lines 8 La and 8 Lb and between audio and high-frequency signal lines 8 Ra and 8 Rb. This is to extend the reception frequency band of the antenna to the lower frequency side.
- a 100 MHz resonant loop antenna, a 200 MHz resonant V-type dipole antenna, and an audio signal line coexist. That is, the function as a 100 MHz resonant loop antenna, the function as a 200 MHz resonant V-dipole antenna, and the left and right audio signals to the left and right earphone units 12 L and 12 R It has the function of transmitting.
- a signal line for both audio and high-frequency signals 8 La, 8 Lb, 8 Ra, 8 Rb, and loading coils LL a, LL b, LR a , LRb and the loop antenna composed of the conductor wires 20a and 20b function as a receiving antenna and resonate.
- the leading coils LLa, LLb, LRa, LRb have a resonance antenna length shortening function for shortening the antenna length required for resonance at a fundamental frequency (for example, 100 MHz). Low circumference even if antenna length is short It plays the role of improving the reception sensitivity to wave number signals.
- the antenna length is 1/2 of the wavelength ⁇ in the case of the dipole antenna, and about 1 to 1.5 times the wavelength ⁇ in the case of the loop antenna. Therefore, in the case of a loop antenna, the antenna loop length required to resonate at 100 MHz usually becomes as long as 3.0 m. This is not practical for portable radios (LCD TVs).
- the earphone antenna 2 has the opening coils LLa, LLb, LRa, and LRb, and its resonance antenna shortening function allows sufficient signals of low frequency even if the antenna length is short. Can be received with sensitivity. More specifically, the inductance of each of the leading coils LLa and LLb is approximately 3.OH at 100 MHz, and is low in the frequency band used for television broadcasting of 100 MHz. Resonance is possible with an antenna length of a practical length suitable for hanging to a signal to which it belongs (relatively long wavelength).
- the length of the loop antenna is set to 1.13 ⁇ including the conductor wires 20a and 20b (40 cm) to be turned around the neck.
- the voice ⁇ Diball antenna consisting of only the high-frequency signal lines 8La, 8Lb, 8Ra, and 8Rb '' has a single-side antenna length of 37 cm, so that the frequency of 200 MHz Resonates with the signal. Therefore, the existence of a V-type dipole antenna that resonates with a signal at a frequency of 200 MHz and excites its harmonics (3rd harmonic, 5th harmonic, and 7th harmonic) at 200 MHz. Become.
- the actual resonance wavelength tends to be slightly shorter than the calculated resonance wavelength for each antenna length.
- the left and right audio signals transmitted from the receiving circuit 19 of the LCD TV 16 via the cable 14 are transmitted through the left and right audio transmission signal lines 18 L and 18 R and the ground line.
- the earphone antenna 2 also has a function of transmitting an audio signal
- the antenna and the earphone unit can be integrated with each other.
- the present earphone antenna 2 can function as a 100 MHz resonant loop antenna or a 200 MHz resonant divo antenna without performing any sensitivity adjustment operation.
- Enough frequency band Sufficiently high receiving sensitivity can be obtained over a wide band that covers, and furthermore, the left and right audio signals from the receiving circuit 19 of the LCD TV 16 to the earphone units 12 L and 12 R Can also be transmitted.
- the ferrite lights F1La, FlLb, F1Ra, and F1Rb reduce the adverse effect of high frequency waves from the human body to the earphone antenna 2 through the earphone units 12L and 12R. This can prevent the stability of the reception on the LCD TV 16 main body from being impaired by the human body.
- the left and right audio / high-frequency signal lines 8 La, 8 Lb, 8 Ra, and 8 Rb are all the same length (37 cm in this example).
- the angle between the balun 4 and the length between the balun 4 and 5 cm is fixed at 90 °. The smaller the angle, and the shorter the length of the fixed part, the lower the receiving sensitivity.
- the conductor wire 20 there are two conductor wires, 20a and 20b, but one conductor wire may be used as shown in the upper right shoulder of FIG. 1B.
- the reason is that the voice signal coming into the high-frequency dual-purpose signal line 8 La, 8 Lb, 8 Ra, 8 Rb is converted to a voice signal blocking capacitor C 4 La, 4 Lb, 4 Ra. , 4 Rb, and cannot enter the conductor wire 20.
- the conductor wire 20 functions only as a part of the loop antenna for high-frequency signals electrically, even one wire This is because there is no problem. In other words, they do not play the role of transmitting audio signals to the left and right earphones, so they do not need two.
- FIG. 5A to 5B show a second embodiment 2a of the earphone antenna of the present invention.
- FIG. 5A is a configuration diagram
- FIG. 5B is a circuit diagram of the antenna.
- the audio / high-frequency signal lines 8Lb and 8Ra are connected to each other without connecting to the balanced mode side terminal of the balun 4, so that a single loop antenna configuration is obtained. is there.
- One ferrite bead FBC is connected between the mutually connected audio / high-frequency signal lines 8Lb / 8Ra and the ground.
- the second embodiment differs from the first embodiment 2 in these two points, but there is no difference in other points.
- the single loop antenna configuration even if the size of the balun is the same, the length of the entire circumference of the effective loop antenna is twice as large as that of the balun. High frequency signals in the frequency band can be received. For example, it is possible to receive the 50 MHz band used in the United States of America.
- FIG. 6A to 6B show a third embodiment 2b of the earphone antenna of the present invention.
- FIG. 6A is a configuration diagram
- FIG. 6B is a circuit diagram of the antenna.
- Embodiment 2b the present invention is applied to an antenna for receiving digital terrestrial waves, and it suffices to receive a high frequency of UHF (470 to 770 MHz).
- the voice / high-frequency signal line 8La, 8Lb, 8Ra, 8 The length of R b can be short.
- the loading coil is not necessary, so that the voice / high-frequency combined signal lines 8La, 8Lb, 8Ra, and 8Rb are connected to the terminals on the opposite balun side.
- Ferrite beads F 1 L a, F l L b, F 1 One ends of R a and F 2 R b are connected, and the other ends of the ferrite beads F 1 L a, F 1 L b, F 1 R a and F 1 R b are connected to the horn units 1 2 L and 1 2 Connected to R.
- the audio signal blocking capacitors C 4 La, C 4 L b, and C 4 R a are connected to the opposite balun terminals of the audio / high-frequency signal lines 8 La, 8 Lb, 8 Ra, and 8 Rb.
- C 4 Rb is connected at one end, and between the other end of C 4 L a and C 4 R a and between the other end of C 4 L b and C 4 R b are conductor wires 20 a, 20 b.
- the two conductor wires 20a and 20b may be replaced by one conductor wire 20, which is the same as in the first embodiment.
- ferrite beads F 1 L a, F l L b, F l R a, F l R b, noise absorbing capacitors C 2 L, C 2 R, and sound signal blocking capacitors C 4 La, C 4 Lb, C4Ra, and C4Rb are contained in ferrite bead 'capacitor boxes 40L and 40R.
- the length of the entire circumference of the loop antenna of the embodiment 2b is 1 for 650111; ⁇ 1? It is suitable for the band of (470-770 MHz).
- the audio / high-frequency signal lines 8La and 8Lb and the 8Ra and 8Rb have an angle of, for example, 90 ° from the balun 4. It was configured to do.
- the present invention can be implemented in a mode in which the angle is set to be about 180 °.
- the connector 20c may be provided on the conductor wires 20a, 20b (or 20), as in the second and third embodiments 2a. , 2b may also be provided with a connector 20c to facilitate the hanging of the neck.
- the balanced mode is changed from the balanced mode to the unbalanced mode by the balun, and the two pairs of voice and high-frequency signal lines are used as a receiving loop antenna for high-frequency signals.
- the two pairs of voice and high-frequency signal lines are used as a receiving loop antenna for high-frequency signals.
- the earphone antenna of claim 2 between the earphone and the audio / high-frequency signal line, high-frequency signals become high-impedance and substantially block the signals, and the On the other hand, a high-frequency signal cut-off means that allows transmission of the signal in low impedance is provided, so that the high-frequency signal cut-off means can prevent high-frequency adverse effects from the human body through the earphone to the antenna and the radio. it can.
- the balun of claim 3 it is possible to prevent the sound signal transmitted by the pair of sound / high-frequency signal lines from leaking to the left and right earphone units by the sound signal cutoff means. The level of the audio signal reaching the earphone unit can be prevented from lowering.
- a high-frequency signal can be mode-converted from a balanced mode to an unbalanced mode by a paran, and higher than a fundamental frequency (for example, 100 MHz).
- a fundamental frequency for example, 100 MHz.
- the leading coil becomes high impedance and is separated from the above two pairs of audio and high frequency signal lines, and the two pairs of audio and high frequency dual use.
- the signal line can function as a dipole antenna and resonate.
- the above-mentioned loading coil becomes low impedance, and the above-mentioned two pairs of audio / high frequency signal lines and the respective loadings connected thereto are connected.
- the conductor wire can function as one loop antenna to resonate. Therefore, it resonates at the fundamental frequency (for example, 100 MHz), and further has its harmonics (3rd harmonic, for example, 300 MHz, 5th harmonic, for example, 500 MHz, 7th harmonic, for example, 7 harmonics).
- a dipole antenna that excites harmonics (for example, 600 MHz) is composed of the above-mentioned two pairs of voice and high-frequency signal lines, etc., and has a sensitivity characteristic with relatively little change in reception sensitivity over a wide frequency band. And no sensitivity adjustment for the earphone antenna is required to obtain its sensitivity characteristics.
- the pair of audio / high-frequency signal lines and the loading coil transmit the audio signal to the left and right earphone units. Since the antenna functions as the antenna, the earphone unit and the antenna can be integrated.
- the antenna can be used for receiving a high-frequency signal over a wide frequency band, and can also be used as a means for transmitting a unit audio signal to a horn, thereby providing a high-sensitivity, wide-band antenna and earphone unit. Can be integrated.
- the double loop in the horn antenna of claim 5 is replaced by a single loop, so that the voice
- the effective antenna length can be doubled even if the length of the frequency-shared signal line is the same.
- the audio signal transmitted by the audio / high-frequency combined signal line leaks to the conductor line instead of the earphone. This can be prevented by the signal blocking means.
- the angle formed between one and the other of the two pairs in the balun-side portion of the two pairs of audio / high-frequency signal lines is approximately 180 °.
- the paired voice and high-frequency signal line resonate as a U-shaped dipole antenna for the high-frequency signal of the above specific frequency.
- the angle formed between one of the two pairs and the other in the balun-side portion of the two pairs of voice and high-frequency signal lines is set to an angle smaller than approximately 180 °.
- the two pairs of voice and high frequency signal lines resonate as a V-type dipole antenna for the high frequency signal of the above specific frequency.
- a high impedance is provided for the high frequency signal between the voice / high frequency signal line and each of the earphones, and the high frequency signal is separated between the high frequency signal and the high frequency signal. Since the high-frequency cutoff means is provided with low impedance to allow transmission of the audio signal, the high-frequency cutoff means can prevent a high-frequency adverse effect from the human body through the earphone to the inside of the antenna. According to the earphone antenna of claim 11, since the band-expansion capacitors are connected between the left and right pairs of voice and high-frequency signal lines, the frequency characteristics of the receiving sensitivity of the antenna are shifted to the low frequency side. Can be expanded.
- the audio signal line for transmitting the audio signal to the audio / high-frequency combined signal line is provided with the high-frequency cut-off means for providing high impedance to the high-frequency signal, It is possible to prevent a high-frequency reception signal from leaking from the dual-purpose signal line to the audio signal line.
- the wireless device of the thirteenth aspect since the above-mentioned earphone antenna is used, the advantage of the earphone antenna can be enjoyed.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Headphones And Earphones (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/547,385 US7671813B2 (en) | 2003-03-07 | 2004-02-12 | Earphone antenna and wireless device including the same |
US12/654,916 US7911401B2 (en) | 2003-03-07 | 2010-01-08 | Earphone antenna and wireless device including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003061844A JP4003671B2 (ja) | 2003-03-07 | 2003-03-07 | イヤーホーンアンテナ及びそれを備えた無線機 |
JP2003-061844 | 2003-03-07 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/547,385 A-371-Of-International US7671813B2 (en) | 2003-03-07 | 2004-02-12 | Earphone antenna and wireless device including the same |
US12/654,916 Continuation US7911401B2 (en) | 2003-03-07 | 2010-01-08 | Earphone antenna and wireless device including the same |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004080112A2 true WO2004080112A2 (ja) | 2004-09-16 |
WO2004080112A3 WO2004080112A3 (ja) | 2004-12-02 |
Family
ID=32958978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/001484 WO2004080112A2 (ja) | 2003-03-07 | 2004-02-12 | イヤーホーンアンテナ及びそれを備えた無線機 |
Country Status (5)
Country | Link |
---|---|
US (2) | US7671813B2 (ja) |
JP (1) | JP4003671B2 (ja) |
KR (1) | KR101021672B1 (ja) |
CN (1) | CN1784812A (ja) |
WO (1) | WO2004080112A2 (ja) |
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WO2008017844A2 (en) * | 2006-08-09 | 2008-02-14 | The Technology Partnership Plc | Headset |
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DK201270410A (en) | 2012-07-06 | 2014-01-07 | Gn Resound As | BTE hearing aid with an antenna partition plane |
DK201270411A (en) | 2012-07-06 | 2014-01-07 | Gn Resound As | BTE hearing aid having two driven antennas |
US9554219B2 (en) | 2012-07-06 | 2017-01-24 | Gn Resound A/S | BTE hearing aid having a balanced antenna |
JP6201995B2 (ja) * | 2012-07-13 | 2017-09-27 | ソニー株式会社 | アンテナ |
US9237404B2 (en) | 2012-12-28 | 2016-01-12 | Gn Resound A/S | Dipole antenna for a hearing aid |
US9408003B2 (en) | 2013-11-11 | 2016-08-02 | Gn Resound A/S | Hearing aid with an antenna |
US9237405B2 (en) | 2013-11-11 | 2016-01-12 | Gn Resound A/S | Hearing aid with an antenna |
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- 2003-03-07 JP JP2003061844A patent/JP4003671B2/ja not_active Expired - Fee Related
-
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- 2004-02-12 CN CNA2004800120578A patent/CN1784812A/zh active Pending
- 2004-02-12 WO PCT/JP2004/001484 patent/WO2004080112A2/ja active Application Filing
- 2004-02-12 US US10/547,385 patent/US7671813B2/en not_active Expired - Fee Related
- 2004-02-12 KR KR1020057016419A patent/KR101021672B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
JP2004274356A (ja) | 2004-09-30 |
US20100141538A1 (en) | 2010-06-10 |
JP4003671B2 (ja) | 2007-11-07 |
US20070171134A1 (en) | 2007-07-26 |
WO2004080112A3 (ja) | 2004-12-02 |
KR20050111344A (ko) | 2005-11-24 |
KR101021672B1 (ko) | 2011-03-17 |
US7671813B2 (en) | 2010-03-02 |
US7911401B2 (en) | 2011-03-22 |
CN1784812A (zh) | 2006-06-07 |
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