Acoustic cavity structure and method for improving attenuation of headphone tweeter

Abstract

The present invention discloses a sound cavity structure and method for improving the attenuation of a headphone tweeter. The structure includes a headphone housing and a speaker unit. The speaker unit divides the cavity into a front cavity and a rear cavity. The speaker unit adopts a coaxial dual speaker and includes: an annular woofer and a tweeter located at the center of the woofer, and the sound-emitting surfaces of the woofer and tweeter face the same direction. A sound guide is provided in the headphone housing, and a through-hole treble channel is provided in the sound guide. 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. After the sound generated by the woofer enters the front cavity, it is conducted out through the sound mouth. The sound generated by the tweeter is directly conducted out through the treble channel. The present invention adopts a coaxial dual speaker, and the sound generated by the tweeter is directly conducted out through the treble channel through the sound guide, thereby avoiding the attenuation of the high-frequency energy of the tweeter due to resonance and sound wave reflection in the front cavity.

Description

Technical Field

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

[0002] In order to improve the sound quality of 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, a woofer and a tweeter are usually installed. A common method is to set the tweeter and woofer in the front cavity of the headphone cavity. Since 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. This will result in insufficient high-frequency resolution, making it difficult for the headphone to meet expectations in terms of sound quality.

[0003] See patent document number CN204518026U, a utility model patent named "Independent Tweeter Single Headphones". 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 a bypass hole opened on the partition wall. Among them, the woofer is set in the earphone shell, and the tweeter is set 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. In this way, two speakers, tweeter and woofer, are set in the earbud earphone, and the tweeter and woofer are respectively set on the inside and outside of the earphone cavity. Although this method can improve high-frequency attenuation, the overall structure of the earphone will change significantly, and it is not applicable to the specifications of existing earbud earphones.

[0004] Additionally, coaxial composite dual speaker products are currently available on the market. These products utilize a coaxial structure to combine tweeters and woofers. Examples include the utility model patent CN222464803U, titled "Coaxial Tweeter and Bass Speaker," and the utility model patent CN218336418U, titled "A Dynamic Flat-Plate Composite Coaxial Loudspeaker." While these coaxial composite dual speaker products can be directly applied to earbuds, they also fail to address the issue of high-frequency frequency response attenuation caused by cavity resonance and sound wave reflections due to the large front volume of the earbuds.

[0005] In view of the above, the inventors propose the following technical solutions. 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 first technical problem mentioned above, the present invention adopts the following technical solution: improving the sound cavity structure of the attenuation of the earphone tweeter, 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, and 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 includes: a ring-shaped 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 includes a treble tube and a tuning tube, the treble channel is opened in the treble tube, the tuning tube is a blind tube, a tuning cavity is provided inside the treble tube, and the 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 treble channel and the open 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 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 as follows: a method for improving the attenuation of the headphone tweeter, wherein 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: an annular woofer and a tweeter located in the center of the woofer, and the sound-emitting surfaces of the woofer and the tweeter face the same 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 in the sound guide, thereby avoiding 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 surface of the tweeter unit; the tuning cavity for adjusting high-frequency resonance is adjusted by filling the sound damping material with a porous structure to adjust the high-frequency resonance damping.

[0017] The present invention adopts the above technical solution, which has the following advantages over the prior art:

[0018] Firstly, the present invention uses coaxial dual speakers to combine the tweeter and woofer together, thereby enabling the invention to be directly used in earbud-type headphones without making major changes to the headphone housing.

[0019] Secondly, the present invention sets a sound guide part in the earphone shell, and transmits the sound generated by the tweeter directly through the tweeter channel through the sound guide part, so as to avoid the attenuation of the high-frequency energy of the tweeter due to resonance and sound wave reflection in the front cavity, and also avoid interference with bass sound waves.

[0020] Finally, a blind-tube tuning cavity is also provided in the sound guide, which adjusts the high-frequency resonance, improves the sound quality, and reduces the burr sensation in the high-frequency listening experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective view of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Figure 3 It is an exploded perspective view of the present invention;

[0024] Figure 4 It is a three-dimensional exploded view from another perspective of the present invention;

[0025] Figure 5is a cross-sectional view of the speaker unit of the present invention;

[0026] Figure 6 This is a comparison chart of the sound pressure curves of the existing comparative product and the embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below using earbud headphones as an example and accompanying drawings.

[0028] 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 includes: an earphone housing 1 having a cavity 10 therein and a speaker unit 2 installed in the cavity 10 .

[0029] The present invention is used in earbud-type earphones, and the earphone housing 1 is only a part of the earphone housing, 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 mouthpiece 11 that communicates with the front cavity 101 and is used to output sound from the speaker unit 2. The earphone housing 1 is also provided with a front tuning hole 103 that communicates with the front cavity 101, and a rear tuning hole 104 that communicates with the rear cavity 102.

[0030] The speaker unit 2 of the present invention adopts a coaxial double 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 .

[0031] The outer bracket 23 and inner bracket 24 cooperate to form an annular cavity for accommodating the woofer 21. An outwardly extending butt joint 241 is formed at the center of the inner bracket 24, with the tweeter 22 located at one end of the inner end of the butt joint 241. An annular sound enclosure 25 covers the sound-emitting surface of the woofer 21. An annular gasket 26 is fixedly mounted on the butt joint 241 and defines the sound enclosure 25.

[0032] The woofer 21 and tweeter 22 have the same sound-emitting surfaces, both facing the side where the sound port 11 is located. The woofer 21 is larger and utilizes a ring-shaped speaker. The tweeter 22 is smaller and can utilize a dynamic coil speaker. The sound produced by the woofer 21 during operation is conducted through the sound enclosure 25, while the sound produced by the tweeter 22 is conducted through the connecting pipe 241.

[0033] A sound guide 3 is provided in the earphone housing 1 . The sound guide 3 can be integrally formed with the earphone housing 1 , or can be independently provided and then assembled in the earphone housing 1 .

[0034] The sound guide 3 comprises an integrally formed treble tube 31 and a tuning tube 32. The tuning tube 32 has a larger diameter than the treble tube 31. A treble channel 310 is defined within the treble tube 31. The tuning tube 32 is a blind tube with a tuning cavity 320 disposed therein.

[0035] The tuning tube 32 extends perpendicularly from the sound-emitting surface of the tweeter 22 to the inner wall of the earphone housing 1. One end of the tweeter tube 31 is inserted into the tuning tube 32, aligning the end of the treble channel 310 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 connecting tube 241 in the speaker unit 2, aligning the treble channel 310 and tuning cavity 320 with the sound-emitting surface of the tweeter 22 in the speaker unit 2.

[0036] The sound outlet 110 is formed inside the sound mouthpiece 11, and a sound outlet cover 12 is installed at the end of the sound outlet 110. During operation, the sound produced by the woofer 21 enters the front cavity 101 and is then transmitted through the sound outlet 110 inside the sound mouthpiece 11. The sound produced by the tweeter 22 is directly transmitted through the tweeter channel 310.

[0037] Combine 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 sponge) to adjust the damping of the high-frequency resonance peak and improve the burr feeling of the high-frequency sound.

[0038] In summary, the method of improving the attenuation of the headphone tweeter unit of the present invention adopts the following two measures:

[0039] Measure 1: The speaker unit 2 is a coaxial dual speaker, comprising: a ring-shaped woofer 21 and a tweeter 22 located at the center of the woofer 21, wherein the woofer 21 and the tweeter 22 have the same sound-emitting surface orientation. The sound generated by the woofer 21 enters the front cavity 101 and is then conducted out through the sound mouth 11.

[0040] Measure 2: A sound guide 3 is provided within the earphone housing 1. The sound guide 3 isolates the sound waves generated by the woofer 21 from the tweeter 22, and the sound generated by the tweeter 22 is directly transmitted through the treble channel 310 provided within the sound guide 3, thereby preventing the attenuation of the treble sound waves. The sound guide 3 includes both a through-hole treble channel 310 and a blind-tube tuning cavity 320. One end of the treble channel 310 and the open end of the tuning cavity 320 are coupled to the sound-emitting surface of the tweeter 22. The tuning cavity 320, which is used to adjust high-frequency resonance, is filled with a porous sound damping material to adjust the high-frequency resonance damping.

[0041] To improve sound quality, the apertures 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. Figure 6 As shown, by comparing the preferred embodiment of the present invention with the conventional general earphones, it can be seen that the sound pressure test curve of the earphones using the present invention has obvious improvement in attenuation in the high frequency region.

[0042] The present invention is applicable not only to earbud headphones but also to other in-ear headphones. Of course, the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes or modifications based on the structures, features, and principles described in the patent application should be included in the patent application.

Claims

1. Improve the acoustic cavity structure of the headphone tweeter attenuation, including: An earphone housing having a cavity therein 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 mouthpiece connected to the front cavity and used to output sound from the speaker unit, characterized in that: The speaker unit is a coaxial dual speaker, which includes: a ring-shaped woofer and a tweeter located in the center of the woofer, and the woofer and tweeter have the same sound-emitting surface facing the same direction; The earphone housing is provided with a sound guide, and 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 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 tweeter is directly conducted out through the treble channel; 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 provided inside. One end of the tuning tube is connected to the sound-emitting surface of the treble unit. The tuning tube is filled with a porous sound damping material. One end of the treble tube is inserted into the tuning tube, so that the port of the treble channel and the open end of the tuning cavity are connected to the sound surface of the treble unit, and the other end of the treble tube extends to the mouthpiece; The aperture ratio of the treble channel to the tuning cavity is 1:1.2-1.

8.

2. The acoustic cavity structure for improving attenuation of a headphone tweeter according to claim 1, characterized in that: The sound guide component is integrally formed in the earphone housing.

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

2.

4. The acoustic cavity structure for improving attenuation of a headphone tweeter according to any one of claims 1 to 3, 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 in 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.

5. The acoustic cavity structure for improving attenuation of a headphone tweeter according to claim 4, characterized in that: The tweeter unit adopts a dynamic loudspeaker.

6. A method for improving the attenuation of a headphone tweeter, wherein a speaker unit is installed in a headphone housing, and the speaker unit is used to separate the cavity into a front cavity and a rear cavity, characterized in that: This method adopts the following measures: Measure 1: The speaker unit is a coaxial dual speaker, which includes: a ring-shaped woofer and a tweeter located in the center of the woofer, and the woofer and tweeter have the same sound-emitting surface. 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 housing to isolate the sound waves generated by the woofer and tweeter. 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. The sound guide is provided with a penetrating treble channel and a blind-tube-shaped tuning cavity; one end of the treble channel and the open end of the tuning cavity are connected to the sound-emitting 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; The aperture ratio of the treble channel to the tuning cavity is 1:1.2-1.8; The aperture ratio of the treble channel to the sound outlet pipe of the sound mouthpiece is 1:3-3.2.

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