Head structure of noise reduction earphone

Abstract

The utility model discloses a head structure of a noise reduction earphone, a loudspeaker divides the space in the head into a front cavity and a rear cavity, the head is provided with a sound nozzle which is communicated with the front cavity and is used for outputting the sound of the loudspeaker, a support is arranged in the head, the space between the support and the loudspeaker forms the front cavity, and the loudspeaker is arranged in the rear cavity. The support is provided with a sound outlet hole communicated with the sound nozzle and the front cavity, and a sound channel is arranged in the support. And a feedback microphone is positioned between the outer side surface of the bracket and the inner wall of the head part, and is communicated with the sound nozzle through a sound channel. According to the utility model, the feedback microphone is arranged between the outer side surface of the support and the inner wall of the head through the support, and is communicated with the sound nozzle of the earphone through the sound channel in the support, so that the volume of the front cavity is effectively reduced, and meanwhile, signals at the sound nozzle can be better collected; the high-frequency wave crest of the finally output tone quality moves rightwards, the high-frequency resonance point becomes high, and the tone quality is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of earphone products, in particular to a head structure of a noise reduction earphone. Background Art

[0002] TWS (True Wireless Stereo) headphones have become the mainstream in the market in recent years, and ANC for TWS headphones has also become a focus of market research. ANC (active noise cancellation) is a method of identifying unwanted sound sources as noise, eliminating the original noise by generating an "anti-noise" signal, thereby eliminating noise in real time. Currently, when designing ANC headphones, commonly used topologies include: feedforward, feedback, and hybrid architectures. For the FB feedback topology (Feed Back Topology), a feedback microphone is set at a position close to the user's ear. The main advantage of this topology is that the microphone can accurately obtain the sound signal that will enter the user's ear, and is used to iteratively remove noise from the system through a feedback loop.

[0003] Currently, TWS earphones generally use FB architecture for noise reduction. The structure inside the earphone head is as follows: the speaker divides the earphone head into the front cavity and the back cavity, and the FB microphone is located in the front cavity. Due to functional requirements, noise-cancelling earphones need to increase the reserved space in the front cavity of the speaker component to place the FB microphone in the front cavity near the sound outlet. Many people have proposed different technical solutions for noise-cancelling headphones with FB architecture, for example: see the Chinese utility model patent with patent number 202122638225.8 and patent name "A kind of active noise-cancelling headphones", the technical solution adopted is: the active noise-cancelling headphones include an earphone housing, a speaker, a sound outlet, a first feedback digital microphone, a second feedback digital microphone and a receiving channel, wherein the speaker divides the earphone housing into a speaker front cavity and a speaker rear cavity, the sound outlet is arranged opposite to the speaker, and is used to output the sound emitted by the speaker, the first feedback digital microphone is arranged at a first noise-cancelling receiving hole preset in the speaker rear cavity, and is used to collect external environmental noise, the second feedback digital microphone is arranged in the speaker front cavity and is fixed to the inner side of the earphone housing, and collects the sound in the ear canal through the receiving channel, the second feedback digital microphone isolates the receiving channel from the speaker front cavity, and collects the sound in the ear canal through the receiving channel, shields the sound emitted by the speaker front cavity, avoids mutual interference between the ear canal noise and the sound of the speaker front cavity, and improves the noise reduction experience of the headphones.

[0004] See the Chinese utility model patent with patent number: 202120009833.X and patent name "Noise-cancelling headphones", which adopts the following technical solution: a noise-cancelling headphone, including: a sound module; a feedback microphone; and a headphone body, the headphone body including an ear shell and a sound mouthpiece, the sound module is installed on the ear shell to separate the ear shell into a front cavity and a rear cavity, the feedback microphone is installed on the ear shell and located on the side of the sound module, and there is a collection cavity between the feedback microphone and the ear shell, and the front cavity is connected between the sound mouthpiece and the collection cavity. By setting the feedback microphone in the ear shell on the side of the sound module, the technical problem that the feedback microphone cannot be installed when the front cavity is small can be effectively overcome. In addition, by connecting the sound mouthpiece, the front cavity and the collection cavity in sequence to form a sound channel, the feedback microphone can directly pick up the sound in the ear canal through the sound channel, so as to neutralize the noise in the ear canal and achieve the purpose of good noise reduction.

[0005] One problem that the above noise-cancelling headphones have not solved is that due to the need to reserve space for the FB microphone to prevent the amplitude of the speaker diaphragm in the speaker assembly from hitting the FB microphone, the front cavity volume is too large, the high-frequency peak is shifted to the left, and the high-frequency resonance point becomes lower. In terms of listening experience, the high-frequency bandwidth is insufficient, and the various tones are superimposed together without a sense of hierarchy, messy, and monotonous, which reduces the overall sound quality experience. Although it can be properly adjusted through EQ compensation, its gain space is limited, and the sound quality produced by digital signal processing cannot be compared with the sound quality produced by the original structure of the sound cavity. At the same time, EQ compensation has no obvious effect on high-frequency improvement.

[0006] In view of this, the inventor proposes the following technical solution. Summary of the invention

[0007] The utility model aims to overcome the deficiencies of the prior art and provide a head structure of a noise reduction earphone.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: a head structure of a noise-cancelling headset, a speaker is arranged in the head of the headset, and the speaker divides the space in the head into a front cavity and a rear cavity, a sound mouthpiece connected to the front cavity and used to output the sound of the speaker is opened on the head, a bracket is arranged in the head, and the space between the bracket and the speaker constitutes the front cavity, a sound outlet hole connecting the sound mouthpiece and the front cavity is opened on the bracket, and a sound channel is arranged in the bracket; a feedback microphone is located between the outer side surface of the bracket and the inner wall of the head, and the feedback microphone is connected to the sound mouthpiece through the sound channel.

[0009] Furthermore, in the above technical solution, an installation recess for installing a feedback microphone is formed on the outer side surface of the bracket, and one end of the sound channel is located at the sound mouth, and the other end is located at the installation recess.

[0010] Furthermore, in the above technical solution, a convex portion is formed on the bracket at a position corresponding to the sound mouthpiece, and the sound outlet hole and the port at one end of the sound channel are both opened on the convex portion.

[0011] Furthermore, in the above technical solution, two sound outlet holes are provided, and the port at one end of the sound channel is located between the two sound outlet holes.

[0012] Furthermore, in the above technical solution, the convex portion is covered with a sound net.

[0013] Furthermore, in the above technical solution, the head includes a front shell and a rear shell that cooperate with each other, the sound mouth is opened on the front shell; the bracket is positioned and installed in the front shell; the feedback microphone is located between the outer side surface of the bracket adjacent to the sound mouth and the inner wall of the front shell.

[0014] Furthermore, in the above technical solution, a conductive component is also provided inside the head of the earphone, and the speaker and the feedback microphone are electrically connected to the conductive component.

[0015] Furthermore, in the above technical solution, an installation recess for installing a feedback microphone and a wire groove are formed on the outer side surface of the bracket, one end of the wire groove extends to the installation recess, and the other end extends to the edge of the bracket. After the end of the conductive component is electrically connected to the feedback microphone located in the installation recess, it passes through the edge of the bracket along the wire groove and is electrically connected to the speaker.

[0016] Furthermore, in the above technical solution, a housing recess corresponding to the position of the feedback microphone is provided on the inner wall of the front housing near the sound mouth, and a tuning hole is provided at a position of the front housing away from the sound mouth.

[0017] Furthermore, in the above technical solution, a positioning pin is formed on the inner wall of the front shell, and a pin hole corresponding to the positioning pin is provided on the bracket.

[0018] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0019] First of all, the feedback microphone in the present invention is not directly arranged in the front cavity of the earphone, but through a bracket, the feedback microphone is arranged between the outer side of the bracket and the inner wall of the head, and is connected with the sound mouth of the earphone through the sound channel in the bracket. This not only effectively reduces the volume of the front cavity, but also can better collect the signal at the sound mouth, so that the high-frequency peak of the final output sound quality is shifted to the right, the high-frequency resonance point becomes higher, and the sound quality is significantly improved.

[0020] Secondly, the utility model has a simple structure. A bracket is added in the front cavity of the earphone to install the feedback microphone and a maximum amplitude space for the speaker diaphragm is reserved. At the same time, the sound receiving channel of the feedback microphone is directly integrated in the bracket, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereogram of the earphone of the utility model

[0022] Figure 2 It is a three-dimensional exploded view of the earphone of the utility model;

[0023] Figure 3 It is the design principle diagram of the utility model;

[0024] Figure 4 It is an assembly exploded view of the front housing, the bracket and the speaker in the utility model;

[0025] Figure 5 yes Figure 4 Another perspective of the three-dimensional exploded view;

[0026] Figure 6 yes Figure 4 3D exploded view of

[0027] Figure 7 It is a three-dimensional exploded view of the front housing, the bracket and the speaker in the utility model;

[0028] Figure 8 It is a cross-sectional view of the utility model when the bracket and the speaker are assembled;

[0029] Fig. 9 It is a three-dimensional diagram of the bracket of the utility model. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with specific embodiments and drawings.

[0031] The utility model is a head structure of a noise reduction headset. Figure 1 , Figure 2 As shown, this is an earphone A applicable to the present invention, and the earphone A has a head 1 adapted to the human auricle. The head 1 includes a front shell 11 and a rear shell 12 that match each other, and a sound mouth 10 is provided on the front shell 11. A speaker 2 is provided in the head 1 of the earphone, and the speaker 2 is connected to the audio circuit of the earphone A through a conductive component 6, and the sound generated by the speaker 2 will be output through the sound mouth 10.

[0032] See Figure 3As shown, this is a design principle diagram of the utility model. In the internal cavity formed by the front shell 11 and the rear shell 12, the space in the head 1 is divided into a front cavity 101 and a rear cavity 102 by the speaker 2. At the same time, a bracket 3 is arranged in the head 1, and the space between the bracket 3 and the speaker 2 constitutes the front cavity 101. The bracket 3 is provided with a sound outlet 30 connecting the sound mouth 10 and the front cavity 101, and a sound channel 31 is arranged in the bracket 3; a feedback microphone 4 is located between the outer side surface of the bracket 3 and the inner wall of the head 1, and the feedback microphone 4 is connected to the sound mouth 10 through the sound channel 31.

[0033] The design principle of the utility model refers to Helmholtz resonance, and the center frequency of the resonance is determined by the following formula:

[0034]

[0035] Where c is the air velocity; AH is the cross-sectional area of ​​the acoustic hole; LH is the length of the acoustic hole; VC is the volume of the cavity.

[0036] It can be seen that if the center frequency of resonance is to be increased, the volume of the VC cavity can be reduced. Corresponding to the present invention, the volume of the front cavity 101 is reduced. Therefore, the feedback microphone 4 provided in the present invention is not directly provided in the front cavity 101 of the earphone, but is provided between the outer side surface of the bracket 3 and the inner wall of the head 1 through a bracket 3, and is connected to the sound mouth 10 of the earphone through the sound channel 31 in the bracket 3. This not only effectively reduces the volume of the front cavity, but also can better collect the signal at the sound mouth 10, so that the high-frequency peak of the final output sound quality is shifted to the right, the high-frequency resonance point becomes higher, and the sound quality is significantly improved.

[0037] See Figures 4 to 9 As shown, this is a specific embodiment of the utility model. In this embodiment, the bracket 3 is positioned and installed in the front housing 11, the sound mouth 10 is arranged in the front housing 11, and a sound mouth net 100 is arranged at the sound mouth 10. A housing recess 110 corresponding to the position of the feedback microphone 4 is arranged at a position of the inner wall of the front housing 11 near the sound mouth 10, and a tuning hole 111 is arranged at a position of the front housing 11 away from the sound mouth 10. A tuning net 114 is arranged at a position of the inner wall of the front housing 11 corresponding to the tuning hole 111.

[0038] The inner wall of the front shell 11 is formed with a positioning frame 113 that cooperates with the bracket 3, and a positioning pin 112. The bracket 3 is limitedly installed in the front shell 11 by the positioning frame 113, and a pin hole 35 corresponding to the positioning pin 112 is provided on the bracket 3. The positioning installation is achieved by the cooperation between the positioning pin 112 and the pin hole 35.

[0039] In order to install the feedback microphone 4, an installation recess 32 for installing the feedback microphone 4 is formed on the outer surface of the bracket 3, and a housing recess 110 corresponding to the position of the feedback microphone 4 is provided on the inner wall of the front housing 11 near the sound mouth 10. The installation recess 32 and the housing recess 110 form a space for accommodating the feedback microphone 4. The sound channel 31 opened in the bracket 3 has one end located at the sound mouth 10 and the other end located at the installation recess 32. The feedback microphone 4 will obtain the sound outside the sound mouth 10 through the sound channel 31. The feedback microphone 4 obtains the sound signal and feeds the signal back to the audio circuit of the earphone A through the conductive component 6 to remove the noise.

[0040] The conductive component 6 disposed in the head 1 is used to electrically connect with the speaker 2 and the feedback microphone 4. The conductive component 6 is usually made of a conductive metal sheet or a flat cable. For ease of installation, the conductive component 6 is passed from the outside of the bracket 3 and then connected to the speaker 2. Therefore, the outer surface of the bracket 3 is not only formed with a mounting recess 32 for mounting the feedback microphone 4, but also formed with a wire groove 34. One end of the wire groove 34 extends to the mounting recess 32, and the other end extends to the edge of the bracket 3, and a notch 340 is formed at the edge. After the end of the conductive component 6 is electrically connected to the feedback microphone 4 located in the mounting recess 32, it passes through the notch 340 at the edge of the bracket 3 along the wire groove 34 and is electrically connected to the speaker 2.

[0041] In this embodiment, the bracket 3 is formed with a convex portion 33 at the position corresponding to the sound mouthpiece 10, and the convex portion 33 is covered with a sound net 5. The sound outlet hole 30 and the port at one end of the sound channel 31 are both opened on the convex portion 33. Specifically, there are two sound outlet holes 30, and the port at one end of the sound channel 31 is located between the two sound outlet holes 30. With this design, under the premise of effectively reducing the volume of the front cavity, the aperture size of the sound outlet hole 31 can be appropriately adjusted to make the high-frequency wave peak move to the right, the high-frequency resonance point become higher, the bandwidth become wider, and the high-frequency energy is sufficient.

[0042] The utility model not only effectively reduces the volume of the front cavity, but also can better collect the signal at the mouthpiece, so that the high-frequency peak of the final output sound quality is shifted to the right, the high-frequency resonance point is increased, and the sound quality is significantly improved. At the same time, the sound receiving channel 31 of the feedback microphone 4 of the utility model is directly integrated in the bracket 3, and the structure is simple.

[0043] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A head structure of a noise reduction headset, wherein a speaker (2) is arranged in the head (1) of the headset, and the speaker (2) divides the space in the head (1) into a front cavity (101) and a rear cavity (102), and a sound mouth (10) is provided on the head (1) and is connected to the front cavity (101) for outputting sound of the speaker (2), characterized in that: A bracket (3) is arranged in the head (1), and the space between the bracket (3) and the speaker (2) constitutes the front cavity (101), the bracket (3) is provided with a sound outlet hole (30) connecting the sound mouth (10) and the front cavity (101), and a sound channel (31) is arranged in the bracket (3); A feedback microphone (4) is located between the outer side surface of the bracket (3) and the inner wall of the head (1), and the feedback microphone (4) is connected to the mouthpiece (10) through the sound channel (31).

2. The head structure of a noise reduction headset according to claim 1, characterized in that: An installation recess (32) for installing a feedback microphone (4) is formed on the outer surface of the bracket (3); one end of the sound channel (31) is located at the sound mouth (10), and the other end is located at the installation recess (32).

3. The head structure of a noise reduction headset according to claim 1, characterized in that: The support (3) is formed with a convex portion (33) at a position corresponding to the sound mouthpiece (10), and the sound outlet hole (30) and a port at one end of the sound channel (31) are both opened on the convex portion (33).

4. The head structure of a noise reduction headset according to claim 3, characterized in that: Two sound outlet holes (30) are provided, and a port at one end of the sound channel (31) is located between the two sound outlet holes (30).

5. The head structure of a noise reduction headset according to claim 3, characterized in that: The convex portion (33) is covered with a sound net (5).

6. A head structure of a noise reduction headset according to any one of claims 1 to 5, characterized in that: The head (1) comprises a front shell (11) and a rear shell (12) which cooperate with each other; the sound mouth (10) is disposed on the front shell (11); the bracket (3) is positioned and installed in the front shell (11); and the feedback microphone (4) is located between the outer side surface of the bracket (3) adjacent to the sound mouth (10) and the inner wall of the front shell (11).

7. The head structure of the noise reduction earphone according to claim 6, characterized in that: A conductive component (6) is also provided inside the head (1) of the earphone, and the loudspeaker (2) and the feedback microphone (4) are electrically connected to the conductive component (6).

8. The head structure of the noise reduction earphone according to claim 7, characterized in that: The outer surface of the bracket (3) is formed with a mounting recess (32) for mounting a feedback microphone (4) and a wire groove (34), one end of the wire groove (34) extends to the mounting recess (32), and the other end extends to the edge of the bracket (3), and the end of the conductive component (6) is electrically connected to the feedback microphone (4) located in the mounting recess (32), and then passes through the edge of the bracket (3) along the wire groove (34) to be electrically connected to the speaker (2).

9. The head structure of a noise reduction headset according to claim 6, characterized in that: A housing recess (110) corresponding to the position of the feedback microphone (4) is provided on the inner wall of the front housing (11) near the mouthpiece (10), and a tuning hole (111) is provided on the front housing (11) away from the mouthpiece (10).

10. The head structure of a noise reduction headset according to claim 6, characterized in that: A positioning pin (112) is formed on the inner wall of the front shell (11), and a pin hole (35) corresponding to the positioning pin (112) is provided on the bracket (3).

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