WO2017177351A1 - 采用最佳单极天线的纯正无线耳机 - Google Patents

采用最佳单极天线的纯正无线耳机 Download PDF

Info

Publication number
WO2017177351A1
WO2017177351A1 PCT/CN2016/000279 CN2016000279W WO2017177351A1 WO 2017177351 A1 WO2017177351 A1 WO 2017177351A1 CN 2016000279 W CN2016000279 W CN 2016000279W WO 2017177351 A1 WO2017177351 A1 WO 2017177351A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
ear
earphone
main pcb
monopole antenna
Prior art date
Application number
PCT/CN2016/000279
Other languages
English (en)
French (fr)
Inventor
杨少聪
林文泰
陈杰斌
Original Assignee
富士高实业有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士高实业有限公司 filed Critical 富士高实业有限公司
Priority to EP16836197.0A priority Critical patent/EP3249943A4/en
Publication of WO2017177351A1 publication Critical patent/WO2017177351A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1033—Cables or cables storage, e.g. cable reels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • 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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • 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
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1025—Accumulators or arrangements for charging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H04R1/1075—Mountings of transducers in earphones or headphones
    • 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
    • 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
    • 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
    • H04R2420/09—Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an earphone, and more particularly to a pure wireless earphone using an optimal monopole antenna.
  • a pure wireless headset refers to a pair of headphones that do not require a wire connection between the left and right earpieces, but uses another wireless communication channel to synchronize stereo audio playback between the left and right earpieces.
  • a dedicated wireless transceiver is required on both the left and right handsets.
  • the Bluetooth wireless communication standard can be used as a suitable solution.
  • the wireless transceiver When the wireless transceiver is equipped with wireless transceivers on both sides (two in total), it means that two Bluetooth links are needed; a) the handset and the audio source The primary communication link between the two; b) the secondary communication link between the left and right handsets.
  • a pure wireless headset typically uses a "master-slave" configuration between the left and right handsets, the primary handset is used to handle the communication link with an audio source (such as a mobile phone), and the other Bluetooth signal channel is used to forward the audio signal to the slave. earpiece.
  • NFMI near-field magnetic induction
  • EM electromagnetic
  • Another solution for making a pure wireless headset is to use an ear-hook design, whereby the designer can place the antenna in the hook. By using this method, it is easy to separate the antenna from the human skin. Again, this is not suitable. In-ear headphones application.
  • the optimal monopole antenna can also maintain an appropriate RF communication link between the main handset and the mobile phone, which is suitable for generating an RF communication link and coupling RF creep waves to human skin to ensure that the antenna has omnidirectional radiation.
  • the antenna can control the transmission and reception of RF signals, and the antenna is a key component of the link between the main link and the mobile phone between the main handset and the main and slave handsets.
  • RF waves can be transmitted to different body parts through the skin surface. Based on this phenomenon, we can conclude that RF waves do not need to be transmitted linearly through a medium (such as the human body). Alternatively, they can be transmitted along the human body surface. . This type of skin in humans The RF transmission carried out by the surface is called "RF Crawling Wave", and both RF waves and antenna radiation patterns coupled to human skin will affect the ability to generate RF creep waves.
  • the RF transmission power is limited by the Bluetooth chipset, it is not desirable to "enhance the RF output power to generate a stronger RF creep wave". At the same time, higher power will also result in higher power consumption and is not suitable for portable devices, especially in-ear headphones, because of its limited battery capacity. Therefore, the shortest communication distance between the "left ear" and the "right ear” is the back of the auricle, whereby the generation of RF creeping waves on the back of the auricle is the best choice.
  • a pure wireless earphone with an optimal monopole antenna including an in-ear earphone case and an RF signal generating device disposed in the in-ear earphone case
  • the in-ear earphone case is composed of a top case and a bottom case, and an in-ear type earphone case
  • the interior is provided with a receiving cavity
  • the bottom of the bottom case extends downward
  • the bottom of the bottom case is a sound outlet that is electrically connected to the receiving cavity
  • the inner part of the bottom case is provided with a speaker that is electrically connected to the sound outlet, and is in the bottom case.
  • the bottom part is provided with an ear pad for inserting into the external ear canal.
  • the top of the bottom case is a positioning table matched with the shape of the ear cavity.
  • the outer bottom surface of the positioning table is matched to the surface of the ear cavity, and the outer wall and the ear of the positioning table
  • the screen contact, the RF signal generating device is located in the receiving cavity, the RF signal generating device is composed of an antenna, a main PCB and a battery, and the main PCB comprises a Bluetooth chipset for establishing an RF communication link with the audio source and the antenna of the sub-handset
  • the battery, the antenna and the speaker are electrically connected to the main PCB, and the ball is centered and the sphere is drawn by the outer wall of the in-ear earphone shell closest to the antenna, and the space formed by the ball is the antenna placement area.
  • the line is located in the antenna placement area, and the radius of the ball is greater than 4 mm.
  • the radius of the ball refers to the antenna and the human skin or tissue. Distance when the ball When the radius is greater than 4 mm, it means that the distance between the antenna and human skin or tissue is greater than 4 mm.
  • the optimal coupling limit of the antenna to human skin or tissue is 4 mm, and when the distance is 4 mm, it is the best antenna center, and the optimal antenna center is also the antenna feedback point.
  • the RF signal penetrates the earrings of the human skull and the thinnest auricle area near the ear cavity, is coupled to the skin near the back of the auricle, and is connected by an optimal RF crawler line.
  • Antenna impedance, radiation pattern and efficiency are all affected by human tissue. Therefore, if the antenna is too close to human skin or tissue, human effects will affect RF transmission efficiency and antenna gain, and then it will directly affect RF communication links and products.
  • the wireless operating range, in addition, the antenna gain and efficiency degradation caused by human effects will also affect the RF waves coupled to the human body. It has been found that if the antenna spacing is greater than 4 mm, it is suitable for generating RF and RF creeping waves coupled to human skin.
  • the main PCB is provided with a vertically disposed metal ground layer, and the metal ground layer uniformly surrounds the edge of the main PCB, and the metal ground layer is used to ensure uniform distribution of the radio frequency radiation current.
  • the width of the ear cavity is less than 1/4 wavelength (about 30 mm) Bluetooth signal, which also means the main PCB.
  • the main form of the main PCB is a very thin electrical ground RF radiation, this small The electrical grounding scheme will result in a decrease in the efficiency of the antenna, in order to offset the degradation of the ground size.
  • the thicker metal ground plane can reduce the internal resistance of the electrical ground plan, and the entire assembly including the main PCB and the battery will form a thicker electrical grounding scheme, which is connected to the metal ground plane of the PCB. It can increase the gain of the antenna, improve the radiation of the antenna and improve the efficiency, making the RF radiation more omnidirectional, which is the key to RF transmission and reception.
  • the metal ground layer is made of a copper foil material.
  • the battery is disposed on a bottom surface of the main PCB, the metal ground layer surrounds the battery, and a USB end plate for charging the battery is disposed at an edge of the main PCB.
  • wireless headphones need to have efficient and sensitive communication transmit and receive capabilities when the audio source is remote or in close proximity to the user (eg, in the pockets of the user's clothing).
  • the antenna is a short monopole antenna, and the short monopole antenna is suitable for the appropriate radiation characteristics of the earphone application. To achieve this requirement, we need to ensure that the antenna has omnidirectional radiation characteristics.
  • the short monopole antenna is a short spiral monopole antenna, and the short spiral monopole antenna is most suitable for an antenna placement area.
  • the short monopole antenna is a balanced antenna
  • a large number of research results show that the balanced antenna is affected by human tissue under the same human skin spacing condition compared to the unbalanced antenna. The degree is lower, because the balanced antenna is less affected by the human body, it is more suitable for pure wireless earphone applications, but the product casing needs to be large enough to accommodate such antennas.
  • the antenna gain and efficiency attenuation of the in-ear Bluetooth device are within an acceptable range, and the antenna can maintain the proper relationship between the main handset and the mobile phone.
  • the antenna and the human skin When the distance between the antenna and the human skin is 4mm, it can form an optimal coupling with the human skin, and can generate an optimal RF crawling communication link between the left and right earphone devices;
  • the auricle and the ear cavity area are the only recessed areas that allow the in-ear headphones to be placed, and at the same time, because of the thinest human tissue near the human ear hole and the back of the ear, it is allowed to penetrate the auricle by RF waves, and The best part of the RF creeping wave on the back of the ear.
  • FIG. 1 is a schematic exploded view showing the structure of an embodiment of the present invention
  • Figure 2 is a cross-sectional view showing an embodiment of the present invention
  • FIG. 3 is a schematic perspective structural view of an RF signal generating apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a 3D antenna radiation working principle according to an embodiment of the present invention.
  • FIG. 6 is a 2D graph of an "X-Z" plane of a simulated and actual antenna radiation pattern according to an embodiment of the present invention
  • the double-headed arrow is the connection direction for each component.
  • the dotted line is the mold.
  • a pseudo-radiation map the solid line is the measured radiation pattern
  • 1 is the bottom case
  • 2 is the top case
  • 3 is the sound outlet
  • 4 is the positioning table
  • 5 is the antenna
  • 6 is the main PCB
  • 7 is the speaker
  • 8 is the battery
  • 9 is the ear pad
  • 10 is a USB end plate
  • 11 is a metal ground layer
  • 12 is a human head
  • 13 is an RF crawling wave
  • 14 is an RF communication link.
  • the pure wireless earphone adopting the best monopole antenna includes an in-ear earphone casing and an RF signal generating device disposed in the in-ear earphone casing, as shown in FIG. 1 and FIG.
  • the in-ear earphone case is composed of a top case 2 and a bottom case 1 paired and fastened.
  • the inside of the in-ear earphone case is provided with a receiving cavity, and the bottom of the bottom case 1 extends downward.
  • the bottom of the bottom case 1 is a sound outlet 3 which is electrically connected to the receiving cavity, and the inside of the bottom case 1 is provided with a sound outlet.
  • the conductive speaker 7 is turned on, and an ear pad 9 for inserting into the external auditory canal is provided at the bottom of the bottom case 1.
  • the top of the bottom case 1 is a positioning table 4 paired with the shape of the ear cavity.
  • the outer bottom surface of the positioning table 4 is matched to the surface of the ear cavity, the outer wall of the positioning table 4 is in contact with the otoscope, and the RF signal generating device is located.
  • the RF signal generating device is composed of the antenna 5, the main PCB 6, and the battery 8.
  • the antenna 5 of the embodiment is a short spiral monopole antenna, and the main PCB 6 includes a Bluetooth chipset.
  • the main PCB 6 of this embodiment is laterally disposed in the receiving space.
  • the antenna 5 is used to establish an RF communication link 14 with the audio source and the antenna 5 of the sub-handset, and the battery 8, the antenna 5 and the speaker 7 are electrically connected to the main PCB 6.
  • the space formed by the ball is the antenna 5 placement area, and the antenna 5 is located in the antenna 5 placement area, and The radius of the ball is greater than 4 mm. Since the in-ear earphone case will be in close contact with the human ear cavity and the tragus when using the earphone, the radius of the ball refers to the distance between the antenna 5 and the human skin or tissue, when the radius of the ball is larger than At 4 mm, it means that the distance between the antenna 5 and the human skin or tissue is greater than 4 mm. If the distance between the antenna 5 and the human skin or tissue is greater than 4 mm, it is suitable for generating RF and the RF crawling wave 13 is coupled to the human skin.
  • the main PCB 6 is provided with a vertically disposed metal ground layer 11 which uniformly surrounds the edge of the main PCB 6.
  • the metal ground layer 11 is used to ensure uniform distribution of radio frequency radiation current, and the ground layer is made of copper foil.
  • the material is soldered, the battery 8 is disposed on the bottom surface of the main PCB 6, the metal ground layer 11 surrounds the battery 8, and a USB end plate 10 for charging the battery 8 is provided at the edge of the main PCB 6.
  • Wave 13 When the radius of the sphere is equal to 4 mm, which means that the distance between the antenna 5 and the human skin or tissue is equal to 4 mm, the top of the antenna 5 is the best antenna feedback point, which satisfies all design criteria and ensures optimal RF climbing.
  • Wave 13 generates and establishes a stable RF link with an audio source (such as a smart phone); when the distance between the antenna 5 and the human skin or tissue is greater than 4 mm, the gain and efficiency of the antenna 5 of the in-ear Bluetooth device are attenuated at this interval.
  • the antenna 5 can also maintain an appropriate RF communication link 14 between the main handset and the mobile phone; when the distance between the antenna 5 and the human skin is 4 mm, it can form an optimal coupling with human skin, and
  • the best RF creeping wave 13 communication link can be generated between the left and right earphone devices; the auricle and the ear cavity area are the only recessed areas that allow the in-ear earphone to be placed.
  • it is precisely because of the earliest human body and the thinnest human tissue near the back of the ear that it is the best part that allows RF waves to penetrate the auricle and generate RF creeping waves 13 on the back of the ear.
  • the shortest communication distance between the "left ear” and the "right ear” is the back of the auricle, and the RF creeping wave 13 is generated on the back of the auricle of the human head 12 as the best choice, and the RF signal can be penetrated.
  • the part is coupled to the skin near the back of the auricle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Manufacturing & Machinery (AREA)
  • Headphones And Earphones (AREA)
  • Telephone Set Structure (AREA)

Abstract

本发明涉及通讯技术领域的采用最佳单极天线的纯正无线耳机，包括入耳式耳机壳及设置于入耳式耳机壳内的RF信号产生装置，底壳的顶部为与耳甲腔的形状配对的定位台，RF信号产生装置由天线、主PCB和电池构成，天线用于与音频源及副听筒的天线建立RF通信链路，以天线为中心点且以入耳式耳机壳中最接近天线的外壁为半径画圆球，该圆球所形成的空间为天线放置区域，天线位于该天线放置区域内，且该圆球的半径大于4毫米。天线与人体皮肤或组织的距离大于4毫米时，能够与人体皮肤形成最佳耦合，并能产生最佳RF爬波通信链路，入耳式蓝牙设备的天线增益和效率衰减处于可接受范围内，天线也能够维持主听筒与移动电话之间具有适当RF通信链路。

Description

采用最佳单极天线的纯正无线耳机 技术领域
本发明涉及通讯技术领域，特别涉及一种耳机，特别涉及采用最佳单极天线的纯正无线耳机。
背景技术
目前，大部分普通无线耳机仅配备有一个RF收发器，用于维持耳机与音频源(如移动电话)之间的无线通信。纯正无线耳机指左右听筒之间无需电线连接的耳机对，而是采用另一个无线通信信道同步左右听筒之间的立体声音频播放。为打造纯正无线耳机，需在左右听筒上均配备专用无线收发器。显而易见，可采用蓝牙无线通信标准作为较合适的解决方案，当纯正无线耳机两侧分别配备有无线收发器(共计2个)时，意味着需要两条蓝牙链路；a)听筒与音频源之间的主通信链路；b)左右听筒之间的次级通信链路。纯正无线耳机通常在左右听筒之间采用“主-从”配置，主听筒用于处理与音频源(如移动电话)之间的通信链路，同时采用另一条蓝牙信号信道将音频信号转发至从听筒。
对于能够穿透人体的无线信号，采用近场磁感应(NFMI)技术或通过增强RF信号强度，补偿人体组织造成的信号损失。相关原理为，人体组织可吸收或高度衰减RF信号，而NFM工通过采用磁场代替电磁(EM)波，以此顺利穿透人体组织。
据此，为确保左右听筒之间通信正常，我们可将天线远离人体皮肤，以此尽量降低人体衰减效应。此外，采用尺寸较大的天线同样能够改善RF传输效率，以此抵消人体造成的信号衰减。上述2种方案均无法生产适于佩戴于耳廓内的产品外形。目前，其中一种打造纯正无线产品的常用方法为，将设备不置于耳廓附近，而是增大产品外壳尺寸，将电子元件配置于外壳内。但是，较大产品尺寸与当前的小型化趋势相悖，且无法确保产品具有轻量化、适于入耳式应用的外形。
制造纯正无线耳机的另一种方案是采用耳挂式设计，据此，设计者可将天线置于挂钩内，通过采用这种方法，易于将天线与人体皮肤相分离，同样，这也不适于入耳式耳机应用。
发明内容
本发明的目的是解决以上缺陷，提供采用最佳单极天线的纯正无线耳机，该最佳单极天线能够在佩戴于头部的入耳式“主-从”听筒之间建立合适RF通信链路，同时，该最佳单极天线也能够维持主听筒与移动电话之间具有适当RF通信链路，其适于产生RF通信链路以及RF爬波与人体皮肤相耦合，确保天线具有全方向辐射特点。
经合理设计，天线能够控制收发RF信号，天线是主听筒与移动电话之间主链路、主从听筒之间链路的关键组件。
大量研究表明，RF波可通过皮肤表面传输至不同身体部位，基于此现象，我们可得出如下结论，RF波无需通过媒介(如人体)进行直线传输，作为替代方案，可沿人体曲面进行传输。此类在人体皮肤 表面进行的RF传输称为“RF爬波”，耦合至人体皮肤的RF波和天线辐射图均将影响产生RF爬波的能力。
由于RF传输功率受蓝牙芯片组限制，因此，“通过增强RF输出功率，以产生更强的RF爬波”这一方法不可取。同时，较高功率也将致使功耗较高，并且不适于便携设备，特别是入耳式耳机应用，因为其电池容量有限。因此，“左耳”-“右耳”之间的最短通信距离为耳廓背面，据此，在耳廓背面产生RF爬波为最佳选择。
本发明的目的是通过以下方式实现的：
采用最佳单极天线的纯正无线耳机，包括入耳式耳机壳及设置于入耳式耳机壳内的RF信号产生装置，入耳式耳机壳由顶壳和底壳配对扣合组成，入耳式耳机壳的内部设有容纳空腔，底壳的底部向下延伸，底壳的底部为与容纳空腔导通的出音口，底壳的内部设有与出音口导通的扬声器，并在底壳的底部套装有用于塞入外耳道口的耳垫，底壳的顶部为与耳甲腔的形状配对的定位台，定位台的外底面配对贴合在耳甲腔的表面，定位台的外壁与耳屏接触，RF信号产生装置位于容纳空腔内，RF信号产生装置由天线、主PCB和电池构成，主PCB包括蓝牙芯片组，该天线用于与音频源及副听筒的天线建立RF通信链路，电池、天线及扬声器均与主PCB进行电性连接，以天线为中心点且以入耳式耳机壳中最接近天线的外壁为半径画圆球，该圆球所形成的空间为天线放置区域，天线位于该天线放置区域内，且该圆球的半径大于4毫米，由于使用耳机时入耳式耳机壳将贴紧人体耳甲腔及耳屏，圆球的半径也就是指天线与人体皮肤或组织的距离，当圆球的 半径大于4毫米时，也就是指天线与人体皮肤或组织的距离大于4毫米。
上述说明中，作为优选的方案，天线与人体皮肤或组织的最佳耦合限值为4毫米，当其距离为4毫米时为最佳天线中心，最佳天线中心也为天线反馈点。
RF信号可穿透人体头骨耳孔和耳甲腔附近的最薄耳廓区域，耦合至耳廓背面附近的皮肤，并通过最佳的RF爬波线路进行连接。
天线阻抗、辐射图和效率等方面均受人体组织影响，因此，如果天线距离人体皮肤或组织过近，人体效应将影响RF传输效率和天线增益，然后其将直接影响RF通信链路和产品的无线工作范围，此外，人体效应造成的天线增益和效率衰减也将影响耦合至人体的RF波。据发现，如果天线间距大于4mm，则其适于产生RF以及RF爬波与人体皮肤相耦合。
上述说明中，作为优选的方案，所述主PCB设有垂直设置的金属接地层，金属接地层均匀围绕着主PCB的边缘，金属接地层用于确保射频辐射电流均匀地分布。
由于入耳式耳机壳需要设置与耳甲腔接触的定位台，这也限制了主PCB的尺寸，耳甲腔的宽度是小于1/4波长(约30mm)蓝牙信号，这也意味着主要的PCB将小于1/4波长，由于主PCB尺寸的限制，天线的辐射模式和效率将更全方位的恶化，在大多数情况下，主PCB的主要形式是一个非常薄的电气接地射频辐射，这个小的电气接地方案将导致天线的效率会降低，为了抵消地面尺寸退化.金属接地层可弥 补这种不利的影响，这是因为较厚的金属接地层可以减少电地计划的内部阻力，整个组件包括主PCB和电池会形成较厚的电气接地方案，这整个电池连PCB的金属接地层，它可提高天线的增益，提高天线的辐射和提高效率，使得射频辐射更加全方位，是射频传输和接收的关键。
上述说明中，作为优选的方案，所述金属接地层由铜箔材料构成。
上述说明中，作为优选的方案，所述电池设置于主PCB的底面，金属接地层围绕着电池，并在主PCB的边缘设有用于给电池充电的USB端板。
通常情况下，当音频源远离或十分靠近用户时(例如位于用户衣服的各口袋内)，无线耳机需具有高效与灵敏的通信发射接收能力。
上述说明中，作为优选的方案，所述天线为短单极天线，短单极天线适于耳机应用的适当辐射特性，为达到这一要求，我们需确保天线具有全方向辐射特点。
上述说明中，作为优选的方案，所述短单极天线为短螺旋单极天线，短螺旋单极天线最适用于天线放置区域。
上述说明中，作为优选的方案，所述短单极天线为平衡型天线，大量研究结果表明，在相同的人体皮肤间距条件下，相比于非平衡型天线，平衡型天线受人体组织的影响程度较低，由于平衡型天线受人体的影响程度较低，因此，其更适于纯正无线耳机应用，但是，产品外壳需足够大，以容纳此类天线。
本发明所产生的有益效果如下：
1)当圆球的半径等于4毫米，也就是指天线与人体皮肤或组织的距离等于4毫米时，天线的顶部为最佳天线反馈点，其满足所有设计准则，能够确保实现最佳RF爬波产生及与音频源(如智能手机)间建立稳固RF链路；
2)天线与人体皮肤或组织的距离大于4毫米时，在此间距条件下，入耳式蓝牙设备的天线增益和效率衰减处于可接受范围内，天线也能够维持主听筒与移动电话之间具有适当RF通信链路；
3)当天线与人体皮肤之间的间距为4mm时，能够与人体皮肤形成最佳耦合，并能在左右耳机设备之间产生最佳RF爬波通信链路；
4)耳廓、耳甲腔区域是允许放置入耳式耳机的唯一凹陷区域，同时，也正是由于人耳孔和耳朵背面附近的最薄人体组织，其才属于允许RF波穿透耳廓，并在耳朵背面产生RF爬波的最佳部位。
附图说明
图1为本发明实施例的结构分解示意图；
图2为本发明实施例的剖面图；
图3为本发明实施例中RF信号产生装置的立体结构示意图；
图4为本发明实施例中RF爬波的基本概念图；
图5为本发明实施例中3D天线辐射工作原理图；
图6为本发明实施例中模拟和实际天线辐射图的“X-Z”平面2D曲线图；
图3中，双向箭头为各零部件安装连接方向，图6中，虚线为模 拟辐射图，实线为实测辐射图；
图1～图5中，1为底壳，2为顶壳，3为出音口，4为定位台，5为天线，6为主PCB，7为扬声器，8为电池，9为耳垫，10为USB端板，11为金属接地层，12为人体头部，13为RF爬波，14为RF通信链路。
具体实施方式
下面结合附图与具体实施方式对本发明作进一步详细描述。
本实施例，参照图1～图6，其具体实施的采用最佳单极天线的纯正无线耳机包括入耳式耳机壳入设置于入耳式耳机壳内的RF信号产生装置，如图1和图3，入耳式耳机壳由顶壳2和底壳1配对扣合组成。入耳式耳机壳的内部设有容纳空腔，底壳1的底部向下延伸，底壳1的底部为与容纳空腔导通的出音口3，底壳1的内部设有与出音口3导通的扬声器7，并在底壳1的底部套装有用于塞入外耳道口的耳垫9。
底壳1的顶部为与耳甲腔的形状配对的定位台4，定位台4的外底面配对贴合在耳甲腔的表面，定位台4的外壁与耳屏接触，RF信号产生装置位于容纳空腔内，RF信号产生装置由天线5、主PCB6和电池8构成，本实施例的天线5为短螺旋单极天线，主PCB6包括蓝牙芯片组，本实施例的主PCB6横向设置于容纳空腔内，该天线5用于与音频源及副听筒的天线5建立RF通信链路14，电池8、天线5及扬声器7均与主PCB6进行电性连接。
以天线5为中心点且以入耳式耳机壳中最接近天线5的外壁为半径画圆球，该圆球所形成的空间为天线5放置区域，天线5位于该天线5放置区域内，且该圆球的半径大于4毫米，由于使用耳机时入耳式耳机壳将贴紧人体耳甲腔及耳屏，圆球的半径也就是指天线5与人体皮肤或组织的距离，当圆球的半径大于4毫米时，也就是指天线5与人体皮肤或组织的距离大于4毫米，如果天线5与人体皮肤或组织的间距大于4mm，则其适于产生RF以及RF爬波13与人体皮肤相耦合。
如图3所示，主PCB6设有垂直设置的金属接地层11，金属接地层11均匀围绕着主PCB6的边缘，金属接地层11用于确保射频辐射电流均匀地分布，属接地层由铜箔材料焊接而成，电池8设置于主PCB6的底面，金属接地层11围绕着电池8，并在主PCB6的边缘设有用于给电池8充电的USB端板10。
当圆球的半径等于4毫米，也就是指天线5与人体皮肤或组织的距离等于4毫米时，天线5的顶部为最佳天线反馈点，其满足所有设计准则，能够确保实现最佳RF爬波13产生及与音频源(如智能手机)间建立稳固RF链路；天线5与人体皮肤或组织的距离大于4毫米时，在此间距条件下，入耳式蓝牙设备的天线5增益和效率衰减处于可接受范围内，天线5也能够维持主听筒与移动电话之间具有适当RF通信链路14；当天线5与人体皮肤之间的间距为4mm时，能够与人体皮肤形成最佳耦合，并能在左右耳机设备之间产生最佳RF爬波13通信链路；耳廓、耳甲腔区域是允许放置入耳式耳机的唯一凹陷区域， 同时，也正是由于人耳孔和耳朵背面附近的最薄人体组织，其才属于允许RF波穿透耳廓，并在耳朵背面产生RF爬波13的最佳部位。
如图4所示，“左耳”-“右耳”之间的最短通信距离为耳廓背面，在人体头部12的耳廓背面产生RF爬波13为最佳选择，RF信号可穿透人体头骨耳孔和耳甲腔附近的最薄耳廓区域，由于人耳孔和耳朵背面附近的最薄人体组织，其才属于允许RF波穿透耳廓，在耳朵背面产生RF爬波13的最佳部位，耦合至耳廓背面附近的皮肤。
如图5所示，其中示出了EM波如何辐射，如何穿透人体头部12耳廓并与耳廓背面的人体皮肤耦合，以及在左右耳机之间形成RF通信链路14。
如图6所示，从模拟和实际辐射图的结果表明，两个辐射图几近拟合，同时，这也证明能够实现“主-从”听筒与音频源之间的RF波收发设计目标。
以上内容是结合具体的优选实施例对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应视为本发明的保护范围。

Claims (7)

  1. 采用最佳单极天线的纯正无线耳机，包括入耳式耳机壳及设置于入耳式耳机壳内的RF信号产生装置，入耳式耳机壳由顶壳和底壳配对扣合组成，入耳式耳机壳的内部设有容纳空腔，底壳的底部向下延伸，底壳的底部为与容纳空腔导通的出音口，底壳的内部设有与出音口导通的扬声器，并在底壳的底部套装有用于塞入外耳道口的耳垫，其特征在于：底壳的顶部为与耳甲腔的形状配对的定位台，定位台的外底面配对贴合在耳甲腔的表面，定位台的外壁与耳屏接触，RF信号产生装置位于容纳空腔内，RF信号产生装置由天线、主PCB和电池构成，主PCB包括蓝牙芯片组，该天线用于与音频源及副听筒的天线建立RF通信链路，电池、天线及扬声器均与主PCB进行电性连接，以天线为中心点且以入耳式耳机壳中最接近天线的外壁为半径画圆球，该圆球所形成的空间为天线放置区域，天线位于该天线放置区域内，且该圆球的半径大于4毫米。
  2. 根据权利要求1所述采用最佳单极天线的纯正无线耳机，其特征在于：所述主PCB设有垂直设置的金属接地层，金属接地层均匀围绕着主PCB的边缘，金属接地层用于确保射频辐射电流均匀地分布。
  3. 根据权利要求2所述采用最佳单极天线的纯正无线耳机，其特征在于：所述金属接地层由铜箔材料构成。
  4. 根据权利要求2所述采用最佳单极天线的纯正无线耳机，其特征在于：所述电池设置于主PCB的底面，金属接地层围绕着电池，并在主PCB的边缘设有用于给电池充电的USB端板。
  5. 根据权利要求1～4任意一项所述采用最佳单极天线的纯正无 线耳机，其特征在于：所述天线为短单极天线。
  6. 根据权利要求5所述采用最佳单极天线的纯正无线耳机，其特征在于：所述短单极天线为短螺旋单极天线。
  7. 根据权利要求5所述采用最佳单极天线的纯正无线耳机，其特征在于：所述短单极天线为平衡型天线。
PCT/CN2016/000279 2016-04-11 2016-05-25 采用最佳单极天线的纯正无线耳机 WO2017177351A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16836197.0A EP3249943A4 (en) 2016-04-11 2016-05-25 Pure wireless headphones using optimal monopole antennas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610219720.6A CN105792049B (zh) 2016-04-11 2016-04-11 采用最佳单极天线的纯正无线耳机
CN201610219720.6 2016-04-11

Publications (1)

Publication Number Publication Date
WO2017177351A1 true WO2017177351A1 (zh) 2017-10-19

Family

ID=56396125

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/000279 WO2017177351A1 (zh) 2016-04-11 2016-05-25 采用最佳单极天线的纯正无线耳机

Country Status (4)

Country Link
US (1) US10341756B2 (zh)
EP (1) EP3249943A4 (zh)
CN (1) CN105792049B (zh)
WO (1) WO2017177351A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019085063A1 (zh) * 2017-11-06 2019-05-09 深圳市魔浪电子有限公司 一种蓝牙耳机

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10516928B2 (en) * 2016-07-15 2019-12-24 New Audio LLC Wearable audio device having external antenna and related technology
CN106231459B (zh) * 2016-07-28 2023-01-24 西安慕声电子科技有限公司 一种半入耳式耳机外壳
CN106331928B (zh) * 2016-09-13 2019-04-23 富士高实业有限公司 带地面反射器的纯正无线耳机
CN107889003B (zh) * 2016-09-30 2024-04-02 深圳市三诺声智联股份有限公司 一种无线耳机
US11546683B2 (en) * 2017-12-29 2023-01-03 Sony Corporation Acoustic output device
US10616750B2 (en) 2018-01-04 2020-04-07 Nxp B.V. Wireless communication device
US10916830B2 (en) * 2018-02-17 2021-02-09 Bose Corporation Earbud system
TW202005165A (zh) * 2018-06-04 2020-01-16 巽晨國際股份有限公司 無線通訊裝置
CN112805879B (zh) 2018-10-15 2024-04-19 索尼半导体解决方案公司 天线设备和耳机
US11297429B2 (en) * 2018-12-03 2022-04-05 Synaptics Incorporated Proximity detection for wireless in-ear listening devices
CN109391871B (zh) * 2018-12-04 2021-09-17 安克创新科技股份有限公司 一种蓝牙耳机
CN109905798A (zh) * 2019-04-08 2019-06-18 成都必盛科技有限公司 无线耳机
TWI770384B (zh) * 2019-05-20 2022-07-11 美律實業股份有限公司 無線耳機
USD920956S1 (en) 2019-06-12 2021-06-01 New Audio, LLC Headset
US10749561B1 (en) * 2019-10-01 2020-08-18 Acoustic Innovation (Huizhou) Co. Ltd. Headphone transmitting and receiving signals through a feed plate antenna with an L-shaped probe
CN112448180B (zh) * 2020-11-17 2022-01-28 深圳市科奈信科技有限公司 一种tws耳机
CN116438713A (zh) * 2020-11-20 2023-07-14 歌尔股份有限公司 用于无线装置和电子设备的充电壳体
US11700474B2 (en) 2021-06-24 2023-07-11 New Audio LLC Multi-microphone headset
USD1000416S1 (en) * 2021-06-24 2023-10-03 New Audio LLC Wireless headphones

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090231211A1 (en) * 2008-03-13 2009-09-17 Sony Ericsson Mobile Communications Ab Antenna for use in earphone and earphone with integrated antenna
CN203554656U (zh) * 2013-10-09 2014-04-16 广东九联科技股份有限公司 一种无线耳机
CN204090085U (zh) * 2014-07-03 2015-01-07 深圳市科奈信科技有限公司 一种耳机
CN104683902A (zh) * 2015-01-29 2015-06-03 精冠科技股份有限公司 具有金属外壳的无线耳机
CN204887344U (zh) * 2015-01-16 2015-12-16 深圳市冠旭电子有限公司 一种无线耳机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7798831B2 (en) * 2007-01-06 2010-09-21 Apple Inc. Connector assemblies
CN103943948B (zh) * 2014-04-09 2016-04-06 中名(东莞)电子有限公司 用于入耳式无线耳机的可折叠pcb板螺旋天线
US9402120B2 (en) * 2014-09-05 2016-07-26 Epickal AB Wireless earbuds
CN104735581A (zh) * 2015-03-19 2015-06-24 中名(东莞)电子有限公司 低损耗的无线立体声蓝牙耳机
US9825355B2 (en) * 2015-12-18 2017-11-21 Motorola Mobility Llc Wireless stereo headset antenna system
US9866946B2 (en) * 2016-06-08 2018-01-09 Bose Corporation Wireless headset

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090231211A1 (en) * 2008-03-13 2009-09-17 Sony Ericsson Mobile Communications Ab Antenna for use in earphone and earphone with integrated antenna
CN203554656U (zh) * 2013-10-09 2014-04-16 广东九联科技股份有限公司 一种无线耳机
CN204090085U (zh) * 2014-07-03 2015-01-07 深圳市科奈信科技有限公司 一种耳机
CN204887344U (zh) * 2015-01-16 2015-12-16 深圳市冠旭电子有限公司 一种无线耳机
CN104683902A (zh) * 2015-01-29 2015-06-03 精冠科技股份有限公司 具有金属外壳的无线耳机

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3249943A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019085063A1 (zh) * 2017-11-06 2019-05-09 深圳市魔浪电子有限公司 一种蓝牙耳机

Also Published As

Publication number Publication date
EP3249943A1 (en) 2017-11-29
EP3249943A4 (en) 2017-11-29
US20170295420A1 (en) 2017-10-12
US10341756B2 (en) 2019-07-02
CN105792049B (zh) 2019-09-10
CN105792049A (zh) 2016-07-20

Similar Documents

Publication Publication Date Title
WO2017177351A1 (zh) 采用最佳单极天线的纯正无线耳机
WO2018049543A1 (zh) 带地面反射器的纯正无线耳机
EP3469809B1 (en) Wireless headset
US10827289B2 (en) Antenna unit
US10944156B2 (en) Wireless earphone antennas
US11546683B2 (en) Acoustic output device
CN110572745B (zh) 一种智能头戴设备
US10219085B2 (en) Antenna unit
JP2021168467A (ja) アンテナを備える聴覚装置
JP2021168469A (ja) プリント回路基板アセンブリ及び出力トランスデューサを備える聴覚装置
WO2024037051A1 (zh) 无线耳机
CN205232412U (zh) 一种内置天线式的头戴蓝牙耳机
WO2020011698A1 (en) Headphone device with antenna arrangement
CN205726239U (zh) 采用最佳单极天线的纯正无线耳机
KR20190016854A (ko) 무선 스테레오 이어폰을 위한 안테나
WO2021042875A1 (zh) 耳机
TWM447057U (zh) 整合天線的耳機裝置
CN118233800A (zh) 一种开放式耳机

Legal Events

Date Code Title Description
REEP Request for entry into the european phase

Ref document number: 2016836197

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2016836197

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16836197

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE