Acoustic cavity structure and method for improving attenuation of high pitch unit of earphone

Abstract

The invention discloses a sound cavity structure and method for improving attenuation of a high-pitch unit of an earphone, the sound cavity structure comprises an earphone shell and a loudspeaker unit, the loudspeaker unit divides a cavity into a front cavity and a rear cavity, the loudspeaker unit adopts coaxial double loudspeakers, and the loudspeaker unit comprises an annular low-pitch unit and a high-pitch unit located at the center of the low-pitch unit. The sound production surfaces of the bass unit and the treble unit face the same direction; a sound guide piece is arranged in the earphone shell, a through high-pitch channel is arranged in the sound guide piece, one end of the high-pitch channel is in butt joint with the sound production surface of the high-pitch unit, and the other end of the high-pitch channel extends to the sound nozzle; the sound generated by the bass unit enters the front cavity and then is conducted out through the sound nozzle. The sound generated by the high-pitch unit is directly transmitted out through the high-pitch channel. The coaxial double loudspeakers are adopted, the sound generated by the high-pitch unit is directly conducted out through the high-pitch channel through the sound guide piece, and attenuation caused by resonance and sound wave reflection of high-frequency energy of the high-pitch unit in the front cavity is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of earphones, and in particular relates to a sound cavity structure and a method for improving the attenuation of an earphone tweeter unit. Background Art

[0002] In order to improve the sound effect of the headphones, Bluetooth headphones with multiple speaker units are currently available on the market. This type of headphones is equipped with at least two speakers. For earbud headphones, due to the limited space in the headphone cavity, woofers and tweeters are usually installed. A common method is to set the tweeter and woofer in the front cavity of the headphone cavity. Since the size of the woofer is usually larger than the tweeter, the high-frequency energy of the tweeter is attenuated more due to cavity resonance and sound wave reflection, thereby reducing the overall effective bandwidth of the headphones, resulting in insufficient high-frequency resolution, making it difficult for the headphone to meet expectations.

[0003] See patent document number CN204518026U, utility model patent named independent tweeter-unit earphone, the technical solution adopted is to set a sound guide tube and a partition wall in the earphone shell, and connect the sound guide tube through the bypass hole opened on the partition wall. Among them, the woofer is arranged in the earphone shell, and the tweeter is arranged outside the partition wall of the earphone shell. The sound waves generated by the tweeter and the woofer are transmitted to the outside through the sound guide tube. Thereby, two speakers, the treble and the bass, are arranged in the earphone, and the treble and the bass are arranged on both sides of the earphone cavity respectively. Although this method can improve the high-frequency attenuation, the overall structure of the earphone will change greatly, and it is not applicable to the specifications of the existing earphones.

[0004] In addition, there are also coaxial composite dual speaker products on the market, which use a coaxial structure to combine tweeters and woofers. For example, the utility model patent with patent document number CN222464803U, named tweeter and bass coaxial speaker, and the utility model patent with patent document number CN218336418U, named a dynamic flat composite coaxial speaker. Although this coaxial composite dual speaker product can be directly applied to earbud headphones, due to the large volume of the front cavity of the earphone, it also cannot solve the problem of the high-frequency energy of the tweeter speaker being attenuated due to cavity resonance and sound wave reflection.

[0005] In view of the above, the inventor proposes the following technical solution. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a sound cavity structure that improves the attenuation of the headphone tweeter unit.

[0007] In order to solve the above-mentioned first technical problem, the present invention adopts the following technical scheme: a sound cavity structure for improving the attenuation of the tweeter unit of the earphone, comprising: an earphone shell with a cavity inside and a speaker unit installed in the cavity, the speaker unit divides the cavity into a front cavity and a rear cavity, the earphone shell is provided with a sound mouth connected to the front cavity and used to output the sound of the speaker unit, the speaker unit adopts a coaxial dual speaker, which comprises: an annular woofer and a tweeter located at the center of the woofer, and the sound-emitting surfaces of the woofer and the tweeter face the same direction; a sound guide is provided in the earphone shell, a treble channel is provided through the sound guide, and one end of the treble channel is connected to the sound-emitting surface of the tweeter, and the other end extends to the sound mouth; the sound generated by the woofer enters the front cavity and is then conducted out through the sound mouth; the sound generated by the tweeter is directly conducted out by the treble channel.

[0008] Furthermore, in the above technical solution, the sound guide component includes a tweeter tube and a tuning tube, the treble channel is opened in the tweeter tube, the tuning tube is a blind tube, a tuning cavity is arranged inside the tuning tube, and an open end of the tuning tube is connected to the sound-emitting surface of the tweeter unit.

[0009] Furthermore, in the above technical solution, the tuning tube is filled with a sound damping material with a porous structure.

[0010] Furthermore, in the above technical solution, the sound guide is integrally formed in the earphone shell, and the tweeter tube is obliquely inserted into the tuning tube, so that the port of the tweeter channel and the opening end of the tuning cavity are connected to the sound surface of the tweeter unit.

[0011] Furthermore, in the above technical solution, the aperture ratio of the treble channel to the tuning cavity is 1:1.2-1.8.

[0012] Furthermore, in the above technical solution, the aperture ratio of the treble channel to the sound outlet pipe of the sound mouthpiece is 1:3-3.2.

[0013] Furthermore, in the above technical solution, the speaker unit includes: a woofer, a tweeter, an outer bracket and an inner bracket, the outer bracket and the inner bracket cooperate with each other to form an annular cavity for accommodating the woofer; a butt joint tube extending outward is formed at the center of the inner bracket, the tweeter is located at one end of the inner side of the butt joint tube, and one end of the sound guide is inserted into the butt joint tube.

[0014] Furthermore, in the above technical solution, the tweeter unit adopts a dynamic loudspeaker.

[0015] The second technical problem to be solved by the present invention is to provide a method for improving the attenuation of the headphone tweeter. The technical solution adopted is: a method for improving the attenuation of the headphone tweeter, a speaker unit is installed in the headphone shell, and the cavity is divided into a front cavity and a rear cavity by the speaker unit. The method adopts the following measures: Measure 1: The speaker unit adopts a coaxial dual speaker, which includes: a ring-shaped woofer and a tweeter located at the center of the woofer, and the woofer and the tweeter have the same sound-emitting surface direction, wherein the sound generated by the woofer enters the front cavity and is then conducted out through the sound mouth; Measure 2: a sound guide is provided in the headphone shell, and the sound waves generated by the woofer and the tweeter are isolated by the sound guide, and the sound generated by the tweeter is directly conducted out through the treble channel opened inside the sound guide to avoid the attenuation of the treble sound waves.

[0016] Furthermore, in the above technical solution, a through treble channel and a blind tube-shaped tuning cavity are simultaneously opened in the sound guide; one end of the treble channel and the opening end of the tuning cavity are combined with each other and connected to the sound-emitting surface of the tweeter unit; the tuning cavity for adjusting the high-frequency resonance is filled with a porous sound damping material to adjust the high-frequency resonance damping.

[0017] After adopting the above technical solution, the present invention has the following advantages over the prior art: Firstly, the present invention uses coaxial dual loudspeakers to combine the tweeter and the woofer together, so that the present invention can be directly used in the earplug-type earphone without making major changes to the earphone housing.

[0018] Secondly, the present invention arranges a sound guide in the earphone shell, through which the sound generated by the tweeter is directly conducted out of the tweeter channel, thereby avoiding attenuation of the high-frequency energy of the tweeter due to resonance and sound wave reflection in the front cavity, and also avoiding interference with bass sound waves.

[0019] Finally, a blind tube-shaped tuning cavity is also opened in the sound guide, which can adjust the high-frequency resonance, improve the sound quality, and improve the burr feeling in the high-frequency hearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a stereogram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 is a three-dimensional exploded view of the present invention; Figure 4 It is a three-dimensional exploded view of another viewing angle of the present invention; Figure 5 is a cross-sectional view of a loudspeaker unit in the present invention; Figure 6 It is a comparison chart of the sound pressure curves of the existing comparative product and the embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described below by taking an earbud-type headset as an example and accompanying drawings.

[0022] The present invention is a sound cavity structure for improving the attenuation of the earphone tweeter unit. Figures 1 to 5 As shown, the present invention comprises: an earphone housing 1 having a cavity 10 inside and a speaker unit 2 installed in the cavity 10 .

[0023] The present invention is used in an earplug-type earphone, and the earphone housing 1 is only a partial housing of the earphone, and the earphone housing 1 is used to install the speaker unit 2. Figure 2 As shown, the speaker unit 2 divides the cavity 10 into a front cavity 101 and a rear cavity 102. The earphone housing 1 is provided with a sound mouth 11 which is connected to the front cavity 101 and is used to output the sound of the speaker unit 2. The earphone housing 1 is provided with a front tuning hole 103 connected to the front cavity 101 and a rear tuning hole 104 connected to the rear cavity 102.

[0024] The speaker unit 2 of the present invention adopts a coaxial dual speaker, combined with Figure 5 As shown, the speaker unit 2 includes: an annular woofer 21 , a tweeter 22 located at the center of the woofer 21 , an outer bracket 23 , an inner bracket 24 , an annular sound cover 25 and an annular gasket 26 .

[0025] The outer bracket 23 and the inner bracket 24 cooperate with each other to form an annular cavity for accommodating the woofer 21; a butt joint pipe 241 extending outward is formed at the center of the inner bracket 24, and the tweeter 22 is located at one end of the inner side of the butt joint pipe 241. The annular sound cover 25 covers the sound-generating surface of the woofer 21. The annular gasket 26 is fixedly sleeved on the butt joint pipe 241 and defines the sound cover 25.

[0026] The woofer 21 and the tweeter 22 have the same sound-emitting surface, both facing the side where the sound mouth 11 is opened. The woofer 21 is relatively large in size and adopts a ring speaker. The tweeter 22 is relatively small in size and can adopt a dynamic speaker. The sound generated by the woofer 21 when working is conducted from the sound cover 25, and the sound generated by the tweeter 22 is conducted from the butt joint 241.

[0027] A sound guide 3 is disposed in the earphone housing 1 . The sound guide 3 can be integrally formed with the earphone housing 1 , or can be independently disposed and then assembled in the earphone housing 1 .

[0028] The sound guide 3 includes: an integrally formed treble pipe 31 and a tuning pipe 32, wherein the tuning pipe 32 has a larger diameter and the treble pipe 31 has a smaller diameter. A treble passage 310 is provided in the treble pipe 31. The tuning pipe 32 is a blind pipe, and a tuning cavity 320 is provided in the interior thereof.

[0029] The tuning tube 32 extends vertically from the sound-generating surface of the tweeter unit 22 to the inner wall of the earphone housing 1. One end of the tweeter tube 31 is inserted into the tuning tube 32, so that the end of the tweeter channel 310 is combined with the open end of the tuning cavity 320. The other end of the tweeter tube 31 extends obliquely to the sound mouthpiece 11. During installation, the open end of the tuning tube 32 is inserted into the butt joint 241 in the speaker unit 2, so that the tweeter channel 310 and the tuning cavity 320 are butted against the sound-generating surface of the tweeter unit 22 in the speaker unit 2.

[0030] The sound outlet pipe 110 is formed inside the sound mouth 11, and a sound outlet cover 12 is installed at the end of the sound outlet pipe 110. When working, the sound generated by the woofer 21 enters the front cavity 101 and then is conducted out through the sound outlet pipe 110 in the sound mouth 11; the sound generated by the tweeter 22 is directly conducted out through the tweeter channel 310.

[0031] Combination Figure 2 As shown, the tuning cavity 320 can be used to adjust the high-frequency resonance peak of the treble by adjusting the size of the tuning cavity 320. In addition, the tuning cavity 320 can be filled with a porous sound damping material (such as a sponge or other material) to adjust the damping of the high-frequency resonance peak and improve the burr feeling of the high-frequency hearing.

[0032] In summary, the method of improving the attenuation of the headphone tweeter unit of the present invention adopts the following two measures: Measure 1: The speaker unit 2 is a coaxial dual speaker, which includes: a ring-shaped woofer 21 and a tweeter 22 located at the center of the woofer 21, and the woofer 21 and the tweeter 22 have the same sound-emitting surface orientation, wherein the sound generated by the woofer 21 enters the front cavity 101 and is then conducted out through the sound mouth 11; Measure 2: A sound guide 3 is provided in the earphone housing 1, and the sound waves generated by the woofer 21 and the tweeter 22 are isolated by the sound guide 3, and the sound generated by the tweeter 22 is directly conducted out through the treble channel 310 opened inside the sound guide 3, so as to avoid the attenuation of the treble sound waves. The sound guide 3 is provided with a through treble channel 310 and a blind-tube-shaped tuning cavity 320; one end of the treble channel 310 and the opening end of the tuning cavity 320 are combined with each other and then connected to the sound-generating surface of the tweeter 22; the tuning cavity 320 for adjusting high-frequency resonance is filled with a porous sound damping material to adjust the high-frequency resonance damping.

[0033] In order to improve the sound quality, the aperture sizes of the treble channel 310, the tuning cavity 320, and the sound outlet tube 110 should have a certain ratio. In the present invention, the aperture ratio of the treble channel 310 to the tuning cavity 320 is 1:1.2-1.8. The aperture ratio of the treble channel 310 to the sound outlet tube of the sound mouthpiece 11 is 1:3-3.2. A preferred embodiment is: the aperture of the treble channel 310 is 0.8mm, the aperture of the tuning cavity 320 is 1.4mm, and the aperture of the sound outlet tube 110 is 2.5mm. See Figure 6 As shown, by comparing the preferred embodiment of the present invention with the conventional general earphone, it can be seen that the sound pressure test curve of the earphone using the present invention has obvious improvement in attenuation in the high-frequency region.

[0034] The present invention is not only applicable to earbud headphones, but also to other earphone products. 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, features and principles described in the scope of the present invention should be included in the scope of the present invention.

Claims

1. Improve the acoustic cavity structure of the headphone tweeter attenuation, including: An earphone housing having a cavity inside and a speaker unit installed in the cavity, wherein the speaker unit divides the cavity into a front cavity and a rear cavity, and the earphone housing is provided with a sound mouth connected to the front cavity and used to output the sound of the speaker unit, characterized in that: The speaker unit is a coaxial dual speaker, which includes: a ring-shaped woofer and a tweeter located at the center of the woofer, and the woofer and the tweeter have the same sound-emitting surface. The earphone housing is provided with a sound guide, and a treble channel is provided in the sound guide, and one end of the treble channel is connected to the sound-emitting surface of the treble unit, and the other end extends to the sound mouth; The sound produced by the woofer enters the front cavity and is then conducted out through the sound mouth; the sound produced by the treble unit is directly conducted out through the treble channel.

2. The sound cavity structure for improving the attenuation of the headphone tweeter unit according to claim 1, characterized in that: The sound guide comprises: a treble tube and a tuning tube. The treble channel is opened in the treble tube. The tuning tube is a blind tube with a tuning cavity arranged inside. One end of the tuning tube opening is connected to the sound-generating surface of the treble unit.

3. The sound cavity structure for improving the attenuation of the headphone tweeter unit according to claim 2, characterized in that: The tuning tube is filled with a sound damping material with a porous structure.

4. The sound cavity structure for improving the attenuation of the headphone tweeter unit according to claim 2, characterized in that: The sound guide is integrally formed in the earphone shell, one end of the treble tube is inserted into the tuning tube, so that the port of the treble channel and the opening end of the tuning cavity are connected to the sound surface of the tweeter unit, and the other end of the treble tube extends to the sound mouth.

5. The sound cavity structure for improving the attenuation of the headphone tweeter unit according to claim 4, characterized in that: The aperture ratio of the treble channel to the tuning cavity is 1:1.2-1.

8.

6. The sound cavity structure for improving the attenuation of the earphone tweeter unit according to claim 4, characterized in that: The aperture ratio of the treble channel to the sound outlet pipe of the sound mouthpiece is 1:3-3.

2.

7. The sound cavity structure for improving the attenuation of the earphone tweeter unit according to any one of claims 1 to 6, characterized in that: The speaker unit includes: a woofer, a tweeter, an outer bracket and an inner bracket. The outer bracket and the inner bracket cooperate with each other to form an annular cavity for accommodating the woofer. A butt joint tube extending outward is formed at the center of the inner bracket. The tweeter is located at one end of the inner side of the butt joint tube, and one end of the sound guide is inserted into the butt joint tube.

8. The sound cavity structure for improving the attenuation of the earphone tweeter unit according to claim 4, characterized in that: The tweeter unit adopts a dynamic loudspeaker.

9. A method for improving the attenuation of a headphone tweeter unit, wherein a speaker unit is installed in a headphone housing, and the cavity is divided into a front cavity and a rear cavity by the speaker unit, characterized in that: This method adopts the following measures: Measure 1: The speaker unit adopts a coaxial dual speaker, which includes: a ring-shaped woofer and a tweeter located at the center of the woofer, and the woofer and the tweeter have the same sound-emitting surface, wherein the sound generated by the woofer enters the front cavity and is then conducted out through the sound mouth; Measure 2: A sound guide is provided inside the earphone shell, through which the sound waves generated by the woofer and the tweeter are isolated, and the sound generated by the tweeter is directly transmitted through the treble channel opened inside the sound guide to avoid attenuation of treble sound waves.

10. The method for improving the attenuation of the headphone tweeter unit according to claim 9, characterized in that: The sound guide is provided with a penetrating treble channel and a blind-tube tuning cavity; one end of the treble channel and the opening end of the tuning cavity are connected to the sound-generating surface of the treble unit after being combined with each other; The tuning cavity for adjusting high-frequency resonance is filled with a sound damping material with a porous structure to adjust the high-frequency resonance damping.

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