WO2018033133A1 - 主动防噪耳机 - Google Patents

主动防噪耳机 Download PDF

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Publication number
WO2018033133A1
WO2018033133A1 PCT/CN2017/098014 CN2017098014W WO2018033133A1 WO 2018033133 A1 WO2018033133 A1 WO 2018033133A1 CN 2017098014 W CN2017098014 W CN 2017098014W WO 2018033133 A1 WO2018033133 A1 WO 2018033133A1
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WO
WIPO (PCT)
Prior art keywords
noise
housing
horn
bracket
voice coil
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PCT/CN2017/098014
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English (en)
French (fr)
Inventor
谢冠宏
邱士嘉
游博丞
孙伟
黎懋纮
Original Assignee
万魔声学科技有限公司
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Publication date
Priority claimed from CN201620901242.2U external-priority patent/CN206042283U/zh
Priority claimed from CN201621135530.8U external-priority patent/CN206212224U/zh
Application filed by 万魔声学科技有限公司 filed Critical 万魔声学科技有限公司
Publication of WO2018033133A1 publication Critical patent/WO2018033133A1/zh

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the utility model relates to the technical field of earphones, in particular to an active noise-proof earphone.
  • anti-noise headphones have been accepted and recognized by more and more consumers. Since the noise is shielded, it is convenient to use the noise-proof headphones to listen to music or answer calls in noisy environments such as airplanes, subways, trains and shopping malls.
  • the traditional anti-noise headphones are passive anti-noise headphones.
  • the physical characteristics of the headphones are used to isolate the external noise from the ear, and the noise is blocked by the sound insulation material, but the noise reduction is limited, and the sound insulation effect is difficult to achieve the desired requirements.
  • the anti-noise headphones adopt active anti-noise, and the anti-noise device is set in the earphone to offset the external noise. Since the audio signal is also passed through the anti-noise device, the bass generated by the earphone is raised to be dull, and the EQ is often required. Equalizer, equalizer) to adjust the bass, but the adjustment effect does not meet the expected requirements.
  • An active noise canceling headset including:
  • An audio speaker coupled to the audio signal source including a first bracket mounted in the housing, a first voice coil located in a magnetic field disposed on the first bracket, coupled to the first voice coil, and fixed to a first diaphragm on the first bracket;
  • a noise prevention device comprising a noise prevention horn disposed in the housing, a microphone connected to the housing, and a noise prevention circuit connected between the noise prevention horn and the microphone;
  • the noise prevention horn includes a second bracket mounted in the housing, a second voice coil located in a magnetic field disposed on the second bracket, a second vibration coupled to the second voice coil and fixed to the second bracket membrane.
  • the housing includes a front case and a rear case connected to the front case; a mounting bracket for fixing the microphone is mounted in the rear case, the mounting frame and the rear A mounting cavity for housing the microphone is disposed between the casings, and the rear casing is further provided with a sound guiding hole communicating with the mounting cavity and for collecting noise from the microphone.
  • a high frequency horn is further disposed in the housing, the front housing has a sound guiding cavity, and the high frequency horn is disposed in the sound guiding cavity.
  • a battery for powering the noise prevention device is further disposed on the housing.
  • the noise prevention device further includes a control switch for connecting or disconnecting the noise prevention horn and the noise prevention circuit.
  • the method further includes a selection switch, the selection end of the selection switch is connected to the noise prevention speaker, and the first fixed end of the selection switch is connected to the audio signal source, and the selection switch is The second fixed end is connected to the noise prevention circuit.
  • An active noise canceling headset including:
  • An audio speaker coupled to the audio signal source including a body bracket mounted in the housing, a first voice coil located in a first magnetic field disposed on the body bracket, coupled to the first voice coil and fixed at a first diaphragm on the body bracket;
  • a noise prevention device comprising a noise prevention horn disposed in the housing, a microphone on the housing, and a noise prevention circuit connected between the noise prevention horn and the microphone; the noise prevention horn includes And a second voice coil of the second magnetic field on the main body bracket, a second diaphragm connected to the second voice coil and fixed on the main body bracket.
  • the main body bracket includes a first mounting portion, a second mounting portion disposed in parallel with the first mounting portion, and is vertically connected between the first mounting portion and the second mounting portion Intermediate connection;
  • a first magnetic component is disposed on the first mounting portion, and a first annular gap defining the first magnetic field is formed between the first magnetic component and an inner wall surface of the intermediate connecting portion, the first voice coil Located in the first annular gap;
  • the second mounting portion is provided with a second magnetic component, the second magnetic component and the intermediate connecting portion
  • a second annular gap defining the second magnetic field is formed between the outer wall faces, and the second voice coil is located in the second annular gap.
  • the housing includes a front case and a rear case connected to the front case; a mounting bracket for fixing the microphone is mounted in the rear case, the mounting frame and the rear A mounting cavity for housing the microphone is disposed between the casings, and the rear casing is further provided with a sound guiding hole communicating with the mounting cavity and for collecting noise from the microphone.
  • a high frequency horn is further disposed in the housing, the front housing has a sound guiding cavity, and the high frequency horn is disposed in the sound guiding cavity.
  • the noise prevention device further includes a control switch for connecting or disconnecting the noise prevention horn and the noise prevention circuit.
  • the method further includes a selection switch, the selection end of the selection switch is connected to the noise prevention speaker, and the first fixed end of the selection switch is connected to the audio signal source, and the selection switch is The second fixed end is connected to the noise prevention circuit.
  • the utility model provides an active noise-preventing earphone, wherein the audio speaker is separately connected with the audio signal source, and the anti-noise circuit is connected between the noise-proof speaker and the microphone, that is, the input end of the noise-proof circuit is connected with the microphone, and the output end of the noise-proof circuit is The noise-proof speaker is connected, and the audio signal to the audio speaker does not pass through the noise prevention circuit.
  • the circuit through which the audio signal passes is completely independent of the anti-noise circuit. While eliminating the environmental noise, the audio signal can be accurately restored, the interference signal generated by the anti-noise circuit is prevented from interfering with the audio signal, and the sound quality of the earphone is improved.
  • FIG. 1 is a schematic structural view of a first embodiment of a first active noise canceling earphone
  • FIG. 2 is a schematic structural view of a second embodiment of a first active noise canceling earphone
  • FIG. 3 is a schematic structural view of another active noise canceling earphone.
  • an active noise canceling earphone includes a housing 100, an audio horn 200, and a noise preventing device 300.
  • the audio horn 200 includes a first bracket 210, a first voice coil 220, and a first diaphragm 230.
  • the first bracket 210 is fixedly mounted in the housing 100.
  • the first voice coil 220 is located in a magnetic field on the first bracket 210.
  • the first diaphragm 230 is connected to the first voice coil 220 and both ends thereof are fixed on the first bracket 210.
  • the noise prevention device 300 includes a noise prevention horn 310, a microphone 330, and a noise prevention circuit 320.
  • the noise prevention horn 310 is fixed in the housing 100, the microphone 330 is fixed at the rear of the housing 100, and the noise prevention circuit 320 is connected between the noise prevention horn 310 and the microphone 330.
  • the noise-proof horn 310 includes a second bracket 311, a second voice coil 312, and a second diaphragm 313.
  • the second bracket 311 is fixedly mounted in the housing 100, and the second voice coil 312 is located in a magnetic field on the second bracket 311.
  • the second diaphragm 313 is connected to the second voice coil 312 and its both ends are fixed to the second bracket 311.
  • first bracket 210 and the second bracket 311 are two independent brackets.
  • the audio speaker 200 is separately connected to the audio signal source, and the input end of the noise prevention circuit 320 is connected to the microphone 330, and the output of the noise prevention circuit 320 is output. The end is connected to the noise prevention horn 310, and the audio signal to the audio horn 200 does not pass through the noise prevention circuit 320.
  • the housing 100 includes a front housing 110 and a rear housing 120 that are separately connected together.
  • the front housing 110 is provided with a sound guiding cavity 111, and the sound emitted by the audio horn 200 will be from the sound guiding cavity 111.
  • the rear housing 120 is mounted with a mounting bracket 410.
  • the microphone 330 is fixed on the mounting bracket 410.
  • a mounting cavity 400 is disposed between the mounting bracket 410 and the rear housing 120. The entire microphone 330 is received in the mounting cavity 400.
  • the ambient noise can be collected well, and the sound guide hole 121 is connected to the mounting cavity 400 on the rear case 120.
  • the audio horn 200 is responsible for the restoration of the audio signal.
  • the ambient noise enters the mounting cavity 400 through the sound guiding hole 121, and the microphone 330 collects environmental noise, converts the environmental noise into a noise electric signal, and the noise preventing circuit
  • the 320 detects the received noise electrical signal, and simultaneously sends an anti-noise signal to the noise-proof horn 310 that has the same amplitude and opposite phase as the noise electrical signal, and the noise-proof horn 310 restores the inverted signal to just offset the environment.
  • the sound of noise, at this time, the ambient noise will be eliminated.
  • the circuit through which the audio signal passes is completely independent of the noise prevention circuit 320, and the audio signal can be accurately ensured while eliminating environmental noise. Restore, prevent the interference of the inverted signal to the audio signal, and improve the sound quality of the earphone.
  • the battery 100 is further provided with a battery.
  • the battery provides energy for the noise prevention device 300.
  • the battery may be a dry battery or a rechargeable battery, such as a polymer lithium ion battery.
  • the housing 100 may also be provided with a charging interface. For the charging of polymer lithium-ion batteries.
  • the noise control device 300 is further provided with a control switch, which can control the communication or disconnection between the noise prevention speaker 310 and the noise prevention circuit 320.
  • a control switch which can control the communication or disconnection between the noise prevention speaker 310 and the noise prevention circuit 320.
  • the noise prevention speaker 310 will Produce a sound that counteracts ambient noise.
  • the noise prevention horn 310 and the noise prevention circuit 320 are disconnected, the noise prevention horn 310 stops working, and the earphone loses the noise prevention function.
  • the control switch can be turned on to eliminate the interference of the ambient noise to the useful sound.
  • the switch can also be controlled to open to prevent ambient noise from affecting sleep.
  • the control switch is turned off and the noise prevention device 300 enters the power saving mode.
  • a high frequency horn is disposed in the sound guiding cavity 111 of the front case 110, and the high frequency horn is a moving iron horn 500.
  • the moving iron horn 500 is used for reducing high frequency signals, which can further improve the earphone. Pronunciation effect.
  • the method further includes a selection switch, wherein the selection end of the selection switch is connected to the noise prevention speaker, the first fixed end of the selection switch is connected to the audio signal source, and the second fixed end of the selection switch is connected to the noise prevention circuit.
  • the noise reduction horn When a noise reduction circuit is needed, such as in an outdoor or noisy vehicle, the noise reduction horn can be connected to the second fixed end through a selection switch, and the noise reduction horn receiving the noise reduction circuit produces the same amplitude as the ambient noise. Acoustic signals with opposite phases are played and played, resulting in good noise cancellation.
  • the noise reduction speaker When the noise reduction circuit is not needed, for example, in a quiet room, the noise reduction speaker can be connected to the first fixed end through a selection switch, and the noise reduction speaker is connected with the audio signal source to receive the audio signal generated by the audio signal source. No., so that the audio speaker and the noise reduction speaker can be used to play music at the same time, to avoid the noise reduction speaker being idle, and at the same time to obtain better music playing effect.
  • the selection switch can be manually operated by the user. In other embodiments, an automatic selection function can also be added, such as collecting ambient noise and comparing with the noise threshold, and automatically controlling whether to connect the first fixed end or the second fixed end according to the comparison result.
  • the present invention further provides an active noise-preventing earphone.
  • the main difference between the noise-proof earphone and the noise-proof earphone is that the audio speaker 200 and the noise-proof speaker 310 share a main body bracket 600 .
  • the noise-preventing earphone includes a housing 100, an audio horn 200, and a noise prevention device 300.
  • the audio horn 200 includes a main body bracket 600, a first voice coil 220, and a first diaphragm 230.
  • the main body bracket 600 is mounted in the housing 100.
  • the first voice coil 220 is located in a first magnetic field disposed on the main body bracket 600.
  • the first diaphragm 230 is coupled to the first voice coil 220 and both ends thereof are fixed to the main body bracket 600.
  • the noise prevention device 300 includes a noise prevention horn 310, a microphone 330, and a noise prevention circuit 320.
  • the noise-proof horn 310 is fixed in the casing 100, the microphone 330 is fixed at the rear of the casing 100, and the noise-proof circuit 320 is connected between the noise-proof horn 310 and the microphone 330 (ie, the input end of the noise-proof circuit 320 is connected to the microphone 330, The output of the noise prevention circuit 320 is connected to the noise prevention horn 310).
  • the noise prevention horn 310 includes a main body bracket 600, a second voice coil 312 and a second diaphragm 313.
  • the main body bracket 600 is fixedly mounted in the housing 100, and the second voice coil 312 is located in a second magnetic field disposed on the main body bracket 600.
  • the second diaphragm 313 is coupled to the second voice coil 312 and has both ends fixed to the body bracket 600.
  • the first diaphragm 230 and the second diaphragm 313 are both fixed on the main body bracket 600. Further, the first diaphragm 230 The second diaphragm 313 is disposed opposite to the second diaphragm 313, that is, the first diaphragm 230 and the second diaphragm 313 are respectively disposed at both ends of the body bracket 600.
  • a speaker unit with a double diaphragm is formed, the earphone assembly is more convenient, the headphone assembly efficiency is improved, the earphone cavity is reduced, the raw material cost and the production cost are reduced, and the earphone assembly and maintenance are also facilitated.
  • the main body bracket 600 includes a first mounting portion 610, a second mounting portion 620, and an intermediate connecting portion 630 that are integrally provided.
  • the first mounting portion 610 and the second mounting portion 620 are disposed in parallel, and the intermediate connecting portion 630 is vertically connected between the first mounting portion 610 and the second mounting portion 620.
  • the main body bracket 600 is equivalent to a disc having a recessed hole formed in the center thereof (similar to the structure of the straw hat), and the bottom surface of the recessed hole is the first mounting portion 610, and the side surface of the recessed hole is the intermediate connecting portion 630, the disc
  • the remaining part is the second installation Part 620.
  • a first magnetic component 710 is disposed on the first mounting portion 610, and a first annular gap 810 is formed between the first magnetic component 710 and the inner wall surface of the intermediate connecting portion 630.
  • the first annular gap 810 is used to define a first magnetic field.
  • the voice coil 220 is located in the first annular void 810.
  • the second mounting portion 620 is provided with a second magnetic component 720.
  • the second magnetic component 720 forms a second annular gap 820 with the outer wall surface of the intermediate connecting portion 630.
  • the second annular gap 820 is for defining a second magnetic field.
  • the voice coil 312 is located in the second annular gap 820.
  • the housing 100 includes a front housing 110 and a rear housing 120 that are separately connected together.
  • the front housing 110 is provided with a sound guiding cavity 111, and the sound emitted by the audio horn 200 will propagate from the sound guiding cavity 111 into the human ear.
  • the rear housing 120 is mounted with a mounting bracket 410.
  • the microphone 330 is fixed on the mounting bracket 410.
  • a mounting cavity 400 is disposed between the mounting bracket 410 and the rear housing 120. The entire microphone 330 is received in the mounting cavity 400.
  • the ambient noise can be collected well, and the sound guide hole 121 is connected to the mounting cavity 400 on the rear case 120.
  • the audio horn 200 is responsible for the restoration of the audio signal.
  • the ambient noise enters the mounting cavity 400 through the sound guiding hole 121.
  • the microphone 330 collects environmental noise, converts the environmental noise into a noise electrical signal, and the noise preventing circuit 320 recognizes the received noise electrical signal and simultaneously sends the noise preventing speaker.
  • the 310 emits an inverted signal having the same amplitude and opposite phase as the noise electrical signal, and the noise prevention horn 310 restores the inverted signal to a sound that just cancels the ambient noise, and the ambient noise is eliminated.
  • the circuit through which the audio signal passes is completely independent of the noise prevention circuit 320, and the audio signal can be accurately ensured while eliminating environmental noise. Restore, prevent the interference of the inverted signal to the audio signal, and improve the sound quality of the earphone.
  • the battery 100 is further provided with a battery, and the battery provides energy for the noise prevention device 300.
  • the battery may be a dry battery or a rechargeable battery, such as a polymer lithium ion battery.
  • the housing 100 is also provided with a charging interface. Charging of polymer lithium ion batteries.
  • the noise control device 300 is further provided with a control switch, which can control the communication or disconnection between the noise prevention speaker 310 and the noise prevention circuit 320.
  • a control switch which can control the communication or disconnection between the noise prevention speaker 310 and the noise prevention circuit 320.
  • the noise prevention speaker 310 and the noise prevention circuit 320 communicate with each other, the noise prevention speaker 310 will Produce a sound that counteracts ambient noise.
  • the noise prevention horn 310 and the noise prevention circuit 320 are disconnected, the noise prevention horn 310 stops working, and the earphone loses the noise prevention function.
  • the control switch can be turned on to eliminate the interference of ambient noise with useful sounds. At rest, the switch can also be turned on to prevent ambient noise from affecting sleep.
  • the control switch is turned off and the noise prevention device 300 enters the power saving mode.
  • a high frequency horn is disposed in the sound guiding cavity 111 of the front case 110, and the high frequency horn is a moving iron horn 500.
  • the moving iron horn 500 is used to restore a high frequency signal, and the sound absorbing effect of the earphone can be further improved.
  • the method further includes a selection switch, wherein the selection end of the selection switch is connected to the noise prevention speaker, the first fixed end of the selection switch is connected to the audio signal source, and the second fixed end of the selection switch is connected to the noise prevention circuit.
  • the noise reduction horn When a noise reduction circuit is needed, such as in an outdoor or noisy vehicle, the noise reduction horn can be connected to the second fixed end through a selection switch, and the noise reduction horn receiving the noise reduction circuit produces the same amplitude as the ambient noise. Acoustic signals with opposite phases are played and played, resulting in good noise cancellation.
  • the noise reduction horn When the noise reduction circuit is not needed, such as in a quiet room, the noise reduction horn can be connected to the first fixed end through a selection switch, so that the noise reduction horn is connected with the audio signal source to receive the audio signal generated by the audio signal source, thereby simultaneously Use the audio speaker and noise reduction speaker to play music, avoiding the noise reduction speaker being idle, and at the same time getting better music playback.
  • the selection switch can be manually operated by the user. In other embodiments, an automatic selection function can also be added, such as collecting ambient noise and comparing with the noise threshold, and automatically controlling whether to connect the first fixed end or the second fixed end according to the comparison result.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

一种主动防噪耳机。包括壳体（100）；音频喇叭（200），与音频信号源连接，包括安装在壳体（100）内的第一支架（210）、位于设置在第一支架（210）上的磁场中的第一音圈（220）、与第一音圈（220）连接并固定在第一支架（210）上的第一振膜（230）；防噪装置（300），包括设置在壳体（100）内的防噪喇叭（310）、与壳体（100）连接的麦克风（330）、以及连接在防噪喇叭（310）和麦克风（330）之间的防噪电路（320）；防噪喇叭（310）包括安装在壳体（100）内的第二支架（311）、位于设置在第二支架（311）上的磁场中的第二音圈（312）、与第二音圈（312）连接并固定在第二支架（311）上的第二振膜（313）。在消除环境噪音的同时，能保证音频信号被准确还原，防止防噪电路产生的反相信号对音频信号的干扰，提高耳机的声音质量。

Description

主动防噪耳机 技术领域
本实用新型涉及耳机技术领域，特别是涉及一种主动防噪耳机。
背景技术
随着人们对于生活品质追求的不断提升和科学技术的快速发展，防噪耳机已被越来越多的消费者接受和认可。由于噪音被屏蔽，可以很方便的使用防噪耳机在飞机、地铁、火车和商场等噪音环境中欣赏音乐或接听电话。
传统的防噪耳机为被动式防噪耳机，一般利用耳机的物理特性将外部噪音与耳朵隔离，通过隔声材料来阻挡噪音，但是噪音的减幅有限，隔音效果难以达到理想的要求，改进后的防噪耳机采用主动式防噪，通过在耳机中设置防噪装置以抵消外部噪音，由于音频信号也经过防噪装置，耳机产生的低音被抬高以致于较沉闷，往往还需再设置EQ(equalizer，均衡器)来调整低音，但调整效果不能满足预期的要求。
实用新型内容
基于此，有必要提供一种能同时确保音质效果和防噪效果的主动防噪耳机。
一种主动防噪耳机，包括：
壳体；
音频喇叭，与音频信号源连接，包括安装在所述壳体内的第一支架、位于设置在所述第一支架上的磁场中的第一音圈、与所述第一音圈连接并固定在所述第一支架上的第一振膜；
防噪装置，包括设置在所述壳体内的防噪喇叭、与所述壳体连接的麦克风、以及连接在所述防噪喇叭和所述麦克风之间的防噪电路；所述防噪喇叭包括安装在所述壳体内的第二支架、位于设置在所述第二支架上的磁场中的第二音圈、与所述第二音圈连接并固定在所述第二支架上的第二振膜。
在其中一个实施例中，所述壳体包括前壳、以及与所述前壳连接的后壳；所述后壳内安装有用于固定所述麦克风的安装架，所述安装架与所述后壳之间设置有收容所述麦克风的安装腔，所述后壳上还开设有与所述安装腔连通并用于供所述麦克风收集噪音的导声孔。
在其中一个实施例中，所述壳体内还设置有高频喇叭，所述前壳具有导音腔，所述高频喇叭设于所述导音腔内。
在其中一个实施例中，所述壳体上还设置有为所述防噪装置供电的电池。
在其中一个实施例中，所述防噪装置还包括用于使所述防噪喇叭和所述防噪电路连通或断开的控制开关。
在其中一个实施例中，还包括选择开关，所述选择开关的选择端与所述防噪喇叭连接，所述选择开关的第一不动端与所述音频信号源连接，所述选择开关的第二不动端与所述防噪电路连接。
一种主动防噪耳机，包括：
壳体；
音频喇叭，与音频信号源连接，包括安装在所述壳体内的主体支架、位于设置在所述主体支架上的第一磁场中的第一音圈、与所述第一音圈连接并固定在所述主体支架上的第一振膜；
防噪装置，包括设置在所述壳体内的防噪喇叭、位于所述壳体上的麦克风、以及连接在所述防噪喇叭和所述麦克风之间的防噪电路；所述防噪喇叭包括设置所述主体支架上的第二磁场中的第二音圈、与所述第二音圈连接并固定在所述主体支架上的第二振膜。
在其中一个实施例中，所述主体支架包括第一安装部、与所述第一安装部平行设置的第二安装部、垂直连接在所述第一安装部与所述第二安装部之间的中间连接部；
所述第一安装部上设置有第一磁组件，所述第一磁组件与所述中间连接部的内壁面之间形成限定所述第一磁场的第一环形空隙，所述第一音圈位于所述第一环形空隙中；
所述第二安装部上设置有第二磁组件，所述第二磁组件与所述中间连接部 的外壁面之间形成限定所述第二磁场的第二环形空隙，所述第二音圈位于所述第二环形空隙中。
在其中一个实施例中，所述壳体包括前壳、以及与所述前壳连接的后壳；所述后壳内安装有用于固定所述麦克风的安装架，所述安装架与所述后壳之间设置有收容所述麦克风的安装腔，所述后壳上还开设有与所述安装腔连通并用于供所述麦克风收集噪音的导声孔。
在其中一个实施例中，所述壳体内还设置有高频喇叭，所述前壳具有导音腔，所述高频喇叭设于所述导音腔内。
在其中一个实施例中，所述防噪装置还包括用于使所述防噪喇叭和所述防噪电路连通或断开的控制开关。
在其中一个实施例中，还包括选择开关，所述选择开关的选择端与所述防噪喇叭连接，所述选择开关的第一不动端与所述音频信号源连接，所述选择开关的第二不动端与所述防噪电路连接。
本实用新型提供的主动防噪耳机，音频喇叭单独与音频信号源连接，防噪电路连接在防噪喇叭和麦克风之间，即防噪电路的输入端与麦克风连接，防噪电路的输出端与防噪喇叭连接，通往音频喇叭的音频信号不经过防噪电路。音频信号所经过的电路与防噪电路完全相互独立，在消除环境噪音的同时，能保证音频信号被准确还原，防止防噪电路产生的反相信号对音频信号的干扰，提高耳机的声音质量。
附图说明
图1为第一种主动防噪耳机的第一实施例的结构示意图；
图2为第一种主动防噪耳机的第二实施例的结构示意图；
图3为另一种主动防噪耳机的结构示意图。
具体实施方式
为了便于理解本实用新型，下面将参照相关附图对本实用新型进行更全面的描述。附图中给出了本实用新型的较佳实施方式。但是，本实用新型可以以 许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本实用新型的公开内容理解的更加透彻全面。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“内”、“外”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
参阅图1，一种主动防噪耳机，包括壳体100、音频喇叭200和防噪装置300。音频喇叭200包括第一支架210、第一音圈220和第一振膜230。第一支架210固定安装在壳体100内，第一音圈220位于第一支架210上的磁场中，第一振膜230与第一音圈220连接且其两端固定在第一支架210上。防噪装置300包括防噪喇叭310、麦克风330和防噪电路320。防噪喇叭310固定在壳体100内，麦克风330固定在壳体100后部，防噪电路320连接在防噪喇叭310和麦克风330之间。防噪喇叭310包括第二支架311、第二音圈312和第二振膜313，第二支架311固定安装在壳体100内，第二音圈312位于第二支架311上的磁场中，第二振膜313与第二音圈312连接且其两端固定在第二支架311上。
值得注意的是，第一支架210和第二支架311为相互独立的两个支架，音频喇叭200单独与音频信号源连接，防噪电路320的输入端与麦克风330连接，防噪电路320的输出端与防噪喇叭310连接，通往音频喇叭200的音频信号不经过防噪电路320。
为了制造、安装和维修的方便，壳体100包括分体连接在一起的前壳110和后壳120，前壳110上设置导音腔111，音频喇叭200所发的声音将从导音腔111中传播出来进入人耳。后壳120安装有安装架410，麦克风330则固定在安装架410上，安装架410与后壳120之间设置有安装腔400，整个麦克风330容置在该安装腔400中，为了使麦克风330能很好的收集环境噪音，后壳120上还开设有与安装腔400连通导声孔121。
音频喇叭200负责音频信号的还原。而环境噪音经导声孔121进入安装腔400内，麦克风330将收集环境噪音，将环境噪音转化为噪音电信号，防噪电路 320将收到的噪音电信号经过识别处理，同时向防噪喇叭310发出与该噪音电信号振幅相同、相位刚好相反的反相信号，防噪喇叭310将此反相信号还原成刚好可抵消环境噪音的声音，此时，环境噪音将被消除。
由于通往音频喇叭200的音频信号不经过防噪电路320，相比现有技术，音频信号所经过的电路与防噪电路320完全相互独立，在消除环境噪音的同时，能保证音频信号被准确还原，防止反相信号对音频信号的干扰，提高耳机的声音质量。
进一步的，壳体100上还设置有电池，电池为防噪装置300提供能量，电池可以为干电池，也可以为充电电池，例如聚合物锂离子电池，壳体100上还设置可以设置有充电接口，用于聚合物锂离子电池的充电。
防噪装置300上还设置有控制开关，可以控制防噪喇叭310和防噪电路320之间的连通或断开，当防噪喇叭310和防噪电路320之间连通时，防噪喇叭310将发出能抵消环境噪音的声音。当防噪喇叭310和防噪电路320之间断开时，防噪喇叭310停止工作，耳机将失去防噪功能。当耳机在接听电话或音乐时，可以将控制开关打开，用以消除环境噪音对有用声音的干扰，在休息时，也可以控制开关打开，防止环境噪音以影响睡眠。当然，耳机不使用或处于相对较为安静的环境中时，控制开关断开，防噪装置300进入节电模式。
参阅图2，另外的实施例中，前壳110的导音腔111内设置有高频喇叭，高频喇叭为动铁喇叭500，动铁喇叭500用于还原高频信号，可以进一步提高耳机的发音效果。
进一步的，还包括选择开关，选择开关的选择端与所述防噪喇叭连接，选择开关的第一不动端与音频信号源连接，选择开关的第二不动端与防噪电路连接。
在需要使用降噪电路时，例如处于户外或噪声较大的交通工具内，可以通过选择开关将降噪喇叭连接第二不动端，降噪喇叭接收降噪电路产生的与环境噪声幅度相同、相位相反的声波信号并播放，从而获得良好的噪音消除效果。在不需要使用降噪电路时，例如安静的室内，可以通过选择开关将降噪喇叭连接第一不动端，使降噪喇叭与音频信号源连接以接收音频信号源生成的音频信 号，从而同时使用音频喇叭和降噪喇叭播放音乐，避免降噪喇叭被闲置，同时能够获得更好的音乐播放效果。选择开关可以由用户进行手动操作，在其他实施例中也可以加入自动选择功能，例如采集环境噪声并与噪声阈值相比较，根据比较结果自动控制连接第一不动端还是第二不动端。
参阅图1至图3，本实用新型还提供另外一种主动防噪耳机，该种防噪耳机与上述防噪耳机的主要区别在于：音频喇叭200和防噪喇叭310共用一个主体支架600。该种防噪耳机包括壳体100，音频喇叭200和防噪装置300。音频喇叭200包括主体支架600、第一音圈220和第一振膜230。主体支架600安装在壳体100内，第一音圈220位于设置在主体支架600上的第一磁场中，第一振膜230与第一音圈220连接且其两端固定在主体支架600上。防噪装置300包括防噪喇叭310、麦克风330和防噪电路320。防噪喇叭310固定在壳体100内，麦克风330固定在壳体100后部，防噪电路320连接在防噪喇叭310和麦克风330之间(即防噪电路320的输入端与麦克风330连接，防噪电路320的输出端与防噪喇叭310连接)。防噪喇叭310包括主体支架600、第二音圈312和第二振膜313，主体支架600固定安装在壳体100内，第二音圈312位于设置在主体支架600上的第二磁场中，第二振膜313与第二音圈312连接且其两端固定在主体支架600上。
值得注意的是，由于音频喇叭200和防噪喇叭310两者共用一个主体支架600，第一振膜230和第二振膜313均固定在该主体支架600上，进一步的，第一振膜230和第二振膜313相背设置在主体支架600上，即第一振膜230和第二振膜313分别设置在主体支架600的两端。这样形成一个具有双振膜的喇叭单体，耳机组装更为方便，提高耳机组装效率，同时缩小耳机腔体，降低原材料成本和生产成本，同时也便于耳机的组装与维修。
主体支架600包括一体设置的第一安装部610、第二安装部620和中间连接部630。第一安装部610和第二安装部620平行设置，中间连接部630垂直连接在第一安装部610和第二安装部620之间。换言之，主体支架600相当于其中心冲压成型有一个凹陷孔的圆盘(类似于草帽的结构)，凹陷孔的底面则为第一安装部610，凹陷孔的侧面为中间连接部630，圆盘上剩余的部分则为第二安装 部620。
第一安装部610上设置有第一磁组件710，第一磁组件710与中间连接部630的内壁面之间形成第一环形空隙810，第一环形空隙810用于限定第一磁场，第一音圈220位于第一环形空隙810中。
第二安装部620上设置有第二磁组件720，第二磁组件720与中间连接部630的外壁面之间形成第二环形空隙820，第二环形空隙820用于限定第二磁场，第二音圈312位于第二环形空隙820中。
壳体100包括分体连接在一起的前壳110和后壳120，前壳110上设置导音腔111，音频喇叭200所发的声音将从导音腔111中传播出来进入人耳。后壳120安装有安装架410，麦克风330则固定在安装架410上，安装架410与后壳120之间设置有安装腔400，整个麦克风330容置在该安装腔400中，为了使麦克风330能很好的收集环境噪音，后壳120上还开设有与安装腔400连通导声孔121。
音频喇叭200负责音频信号的还原。而环境噪音经导声孔121进入安装腔400内，麦克风330将收集环境噪音，将环境噪音转化为噪音电信号，防噪电路320将收到的噪音电信号经过识别处理，同时向防噪喇叭310发出与该噪音电信号振幅相同、相位刚好相反的反相信号，防噪喇叭310将此反相信号还原成刚好可抵消环境噪音的声音，此时，环境噪音将被消除。
由于通往音频喇叭200的音频信号不经过防噪电路320，相比现有技术，音频信号所经过的电路与防噪电路320完全相互独立，在消除环境噪音的同时，能保证音频信号被准确还原，防止反相信号对音频信号的干扰，提高耳机的声音质量。
进一步的，壳体100上还设置有电池，电池为防噪装置300提供能量，电池可以为干电池，也可以为充电电池，例如聚合物锂离子电池，壳体100上还设置有充电接口，用于聚合物锂离子电池的充电。
防噪装置300上还设置有控制开关，可以控制防噪喇叭310和防噪电路320之间的连通或断开，当防噪喇叭310和防噪电路320之间连通时，防噪喇叭310将发出能抵消环境噪音的声音。当防噪喇叭310和防噪电路320之间断开时，防噪喇叭310停止工作，耳机将失去防噪功能。当耳机在接听电话或音乐时， 可以将控制开关打开，用以消除环境噪音对有用声音的干扰，在休息时，也可以控制开关打开，防止环境噪音以影响睡眠。当然，耳机不使用或处于相对较为安静的环境中时，控制开关断开，防噪装置300进入节电模式。
具体的，前壳110的导音腔111内设置有高频喇叭，高频喇叭为动铁喇叭500，动铁喇叭500用于还原高频信号，可以进一步提高耳机的发音效果。
进一步的，还包括选择开关，选择开关的选择端与所述防噪喇叭连接，选择开关的第一不动端与音频信号源连接，选择开关的第二不动端与防噪电路连接。
在需要使用降噪电路时，例如处于户外或噪声较大的交通工具内，可以通过选择开关将降噪喇叭连接第二不动端，降噪喇叭接收降噪电路产生的与环境噪声幅度相同、相位相反的声波信号并播放，从而获得良好的噪音消除效果。在不需要使用降噪电路时，例如安静的室内，可以通过选择开关将降噪喇叭连接第一不动端，使降噪喇叭与音频信号源连接以接收音频信号源生成的音频信号，从而同时使用音频喇叭和降噪喇叭播放音乐，避免降噪喇叭被闲置，同时能够获得更好的音乐播放效果。选择开关可以由用户进行手动操作，在其他实施例中也可以加入自动选择功能，例如采集环境噪声并与噪声阈值相比较，根据比较结果自动控制连接第一不动端还是第二不动端。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本实用新型的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对实用新型专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干变形和改进，这些都属于本实用新型的保护范围。因此，本实用新型专利的保护范围应以所附权利要求为准。

Claims (7)

  1. 一种主动防噪耳机，其特征在于，包括：
    壳体；
    音频喇叭，与音频信号源连接，包括安装在所述壳体内的第一支架、位于设置在所述第一支架上的磁场中的第一音圈、与所述第一音圈连接并固定在所述第一支架上的第一振膜；
    防噪装置，包括设置在所述壳体内的防噪喇叭、与所述壳体连接的麦克风、以及连接在所述防噪喇叭和所述麦克风之间的防噪电路；所述防噪喇叭包括安装在所述壳体内的第二支架、位于设置在所述第二支架上的磁场中的第二音圈、与所述第二音圈连接并固定在所述第二支架上的第二振膜。
  2. 根据权利要求1所述的主动防噪耳机，其特征在于，所述壳体包括前壳、以及与所述前壳连接的后壳；所述后壳内安装有用于固定所述麦克风的安装架，所述安装架与所述后壳之间设置有收容所述麦克风的安装腔，所述后壳上还开设有与所述安装腔连通并用于供所述麦克风收集噪音的导声孔。
  3. 根据权利要求2所述的主动防噪耳机，其特征在于，所述壳体内还设置有高频喇叭，所述前壳具有导音腔，所述高频喇叭设于所述导音腔内。
  4. 根据权利要求1所述的主动防噪耳机，其特征在于，所述壳体上还设置有为所述防噪装置供电的电池。
  5. 根据权利要求1所述的主动防噪耳机，其特征在于，所述防噪装置还包括用于使所述防噪喇叭和所述防噪电路连通或断开的控制开关。
  6. 根据权利要求1所述的主动防噪耳机，其特征在于，还包括选择开关，所述选择开关的选择端与所述防噪喇叭连接，所述选择开关的第一不动端与所述音频信号源连接，所述选择开关的第二不动端与所述防噪电路连接。
  7. 一种主动防噪耳机，其特征在于，包括：
    壳体；
    音频喇叭，与音频信号源连接，包括安装在所述壳体内的主体支架、位于设置在所述主体支架上的第一磁场中的第一音圈、与所述第一音圈连接并固定
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