A sound-conducting structure for an earphone with high and low frequency drivers

Abstract

This utility model discloses a sound guiding structure for an earphone with high and low frequency units, comprising an earphone shell and a speaker unit. The speaker unit divides the cavity into a front cavity and a rear cavity. The speaker unit is a coaxial dual speaker, comprising: a ring-shaped woofer and a tweeter located at the center of the woofer, with the woofer and tweeter having the same sound-emitting surfaces. A sound guide is provided inside the earphone shell, and a through-type tweeter channel is provided within the sound guide. One end of the tweeter channel is connected to the sound-emitting surface of the tweeter, and the other end extends to the mouthpiece. The sound generated by the woofer enters the front cavity and is then conducted out through the mouthpiece. The sound generated by the tweeter is directly conducted out through the tweeter channel. This utility model uses a coaxial dual speaker, and the sound guide directly conducts the sound generated by the tweeter through the tweeter channel, avoiding the attenuation caused by resonance and sound wave reflection of the high-frequency energy of the tweeter in the front cavity.

Description

Technical Field

[0001] This utility model relates to the technical field of headphone products, and specifically to a sound guiding structure for a headphone acoustic cavity with high and low frequency units. Background Technology

[0002] To improve headphone sound quality, multi-speaker Bluetooth headphones are now available on the market. These headphones have at least two speakers. For in-ear headphones, due to the limited space in the earphone cavity, a woofer and a tweeter are usually included. A common approach is to place the tweeter and woofer in the front cavity of the earphone. Because 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, thus reducing the overall effective bandwidth of the headphone. This can result in insufficient high-frequency resolution, making the headphone sound quality fall short of expectations.

[0003] See the utility model patent CN204518026U, entitled "Independent Tweeter Headphone," which employs a technical solution of setting a sound guide tube and a partition wall inside the headphone shell, with a bypass hole in the partition wall connecting to the sound guide tube. The woofer is located inside the headphone shell, while the tweeter is located outside the partition wall. The sound waves generated by the tweeter and woofer are transmitted to the outside via the sound guide tube. This achieves the integration of two speakers—a tweeter and a woofer—in an in-ear headphone, with the tweeter and woofer positioned on the inside and outside of the headphone cavity respectively. While this method can improve high-frequency attenuation, it significantly alters the overall headphone structure and is not suitable for existing in-ear headphone specifications.

[0004] In addition, coaxial composite dual-speaker products have also appeared on the market. These products combine a tweeter and a woofer using a coaxial structure. Examples include utility model patents CN222464803U (Coaxial Tweeter and Woofer) and CN218336418U (Dynamic Planar Composite Coaxial Speaker). While these coaxial composite dual-speaker products can be directly applied to in-ear headphones, the large volume of the headphone's front cavity means they cannot solve the problem of high-frequency energy attenuation in the tweeter's frequency response curve due to cavity resonance and sound wave reflection.

[0005] In view of the above, the inventors propose the following technical solutions. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a sound guiding structure for an earphone with high and low frequency units.

[0007] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a sound guiding structure for an earphone with a high and low frequency unit, comprising: an earphone shell with an internal cavity and a speaker unit installed in the cavity, wherein the speaker unit divides the cavity into a front cavity and a rear cavity; the earphone shell has a mouthpiece that communicates with the front cavity and is used to output the sound of the speaker unit; the speaker unit is a coaxial dual speaker, comprising: a ring-shaped bass unit and a tweeter located at the center of the bass unit, and the sound-emitting surfaces of the bass unit and the tweeter face the same direction; a sound guide is provided inside the earphone shell, and a through tweeter channel is provided inside the sound guide, wherein one end of the tweeter channel is connected to the sound-emitting surface of the tweeter, and the other end extends to the mouthpiece; the sound generated by the bass unit enters the front cavity and is then conducted out through the mouthpiece; the sound generated by the tweeter unit is directly conducted out through the tweeter channel.

[0008] Furthermore, in the above technical solution, the sound guide includes a tweeter tube and a tuning tube. The tweeter channel is located inside the tweeter tube, and the tuning tube is a blind tube with a tuning cavity inside. One 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 inside 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 together to the sound-emitting surface of the tweeter unit.

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

[0012] Furthermore, in the above technical solution, the ratio of the high-frequency channel diameter to the outlet diameter of the mouthpiece is 1:3-3.2.

[0013] Furthermore, in the above technical solution, the speaker unit includes: a bass unit, 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 bass unit. The inner bracket has an outwardly extending connecting pipe at its center, and the tweeter is located at one end of the connecting pipe. One end of the sound guide is inserted into the connecting pipe.

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

[0015] The present invention, by adopting the above technical solution, has the following advantages over the prior art:

[0016] First, this invention uses coaxial dual speakers to combine the high-frequency and low-frequency speakers, thus enabling it to be directly used in in-ear headphones without making significant modifications to the headphone shell.

[0017] Secondly, this invention provides a sound guide inside the earphone shell, which directly transmits the sound generated by the tweeter through the tweeter channel, avoiding the attenuation caused by resonance and sound wave reflection of the high-frequency energy of the tweeter in the front cavity, and also avoiding interference with the bass sound waves.

[0018] Finally, a blind-tube-shaped tuning cavity is also provided inside the sound guide. The high-frequency resonance is adjusted through the tuning cavity to improve the sound quality and reduce the harshness of the high-frequency sound. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a sectional view of the present invention;

[0021] Figure 3 This is an exploded perspective view of the present invention;

[0022] Figure 4 This is an exploded perspective view of the present invention from another angle;

[0023] Figure 5 This is a cross-sectional view of the speaker unit in this utility model. Detailed Implementation

[0024] The present invention will be further described below using an in-ear headphone as an example and with accompanying drawings.

[0025] This utility model relates to a sound guiding structure for an earphone with high and low frequency drivers, see [link / reference]. Figures 1 to 5 As shown, the present invention includes: an earphone housing 1 having an internal cavity 10 and a speaker unit 2 installed inside the cavity 10.

[0026] This invention relates to in-ear headphones, where the headphone housing 1 is only a part of the headphone housing, and this headphone housing 1 is used to mount the speaker unit 2. Combined with... 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 has 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 also has 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.

[0027] The speaker unit 2 of this utility model adopts a coaxial dual speaker, combined with Figure 5 As shown, the speaker unit 2 includes: a ring-shaped woofer 21, a tweeter 22 located at the center of the woofer 21, an outer bracket 23, an inner bracket 24, a ring-shaped sound cover 25, and a ring-shaped gasket 26.

[0028] The outer support 23 and the inner support 24 cooperate with each other to form an annular cavity for accommodating the bass unit 21. An outwardly extending connecting tube 241 is formed at the center of the inner support 24, and the tweeter 22 is located at one end inside the connecting tube 241. An annular sound cover 25 covers the sound-emitting surface of the bass unit 21. An annular gasket 26 is fixedly fitted onto the connecting tube 241 and defines the sound cover 25.

[0029] The bass unit 21 and tweeter 22 have the same sound-emitting surface, both facing the side where the mouthpiece 11 is located. The bass unit 21 is larger and uses a ring speaker. The tweeter 22 is smaller and can use a dynamic speaker. The sound generated by the bass unit 21 is conducted through the sound cover 25, and the sound generated by the tweeter 22 is conducted through the connecting pipe 241.

[0030] The earphone shell 1 is provided with a sound guide 3. The sound guide 3 can be integrally formed with the earphone shell 1, or it can be set independently and then assembled into the ear shell 1.

[0031] The sound guide 3 includes an integrally formed tweeter tube 31 and a tuning tube 32, wherein the tuning tube 32 has a larger diameter and the tweeter tube 31 has a smaller diameter. A through-hole tweeter channel 310 is provided inside the tweeter tube 31. The tuning tube 32 is a blind tube, and a tuning cavity 320 is provided inside it.

[0032] The tuning tube 32 extends vertically from the sound-emitting surface of the tweeter 21 to the inner wall of the earphone housing 1. One end of the tweeter 31 is inserted into the tuning tube 32, so that the port of the tweeter channel 310 is connected to the opening end of the tuning cavity 320. The other end of the tweeter 31 extends obliquely to the mouthpiece 11. During installation, the opening end of the tuning tube 32 is inserted into the connecting tube 241 in the speaker unit 2, so that the tweeter channel 310 and the tuning cavity 320 are connected to the sound-emitting surface of the tweeter 21 in the speaker unit 2.

[0033] The mouthpiece 11 has a sound outlet tube 110 formed inside, and a sound outlet cover 12 is installed at the port of the sound outlet tube 110. During operation, the sound generated by the bass unit 21 enters the front cavity 101 and is then conducted out through the sound outlet tube 110 inside the mouthpiece 11; the sound generated by the tweeter 22 is directly conducted out through the tweeter channel 310.

[0034] Combination Figure 2 As shown, the tuning cavity 320 can be used to adjust the high-frequency resonant peaks of the treble by adjusting its size. Additionally, filling the tuning cavity 320 with a porous sound damping material (such as sponge) can adjust the damping of the high-frequency resonant peaks and improve the harshness of the high-frequency sound.

[0035] In this invention, both the mid-bass unit 21 and the tweeter 22 are tuned and depressurized through the rear tuning port 104 on the rear cavity 102 during operation. The bass unit 21 tunes and depressurizes the front cavity 101 through the front tuning port 103 during operation. The tweeter 22 is isolated from the front tuning port 103 and is adjusted through an independent tuning chamber 320.

[0036] In summary, the method for improving the attenuation of the tweeter unit in headphones according to this utility model adopts the following two measures:

[0037] Measure 1: The speaker unit 2 adopts a coaxial dual speaker, which includes: a ring-shaped woofer unit 21 and a tweeter unit 22 located in the center of the woofer unit 21, and the sound-emitting surfaces of the woofer unit 21 and the tweeter unit 22 face the same direction. The sound generated by the woofer unit 21 enters the front cavity 101 and is then transmitted out through the mouthpiece 11.

[0038] Measure 2: A sound guide 3 is provided inside the earphone shell 1. The sound guide 3 isolates the bass unit 21 from the tweeter 22, and the sound generated by the tweeter 22 is directly transmitted through the tweeter channel 310 inside the sound guide 3, avoiding attenuation of the tweeter sound waves. The sound guide 3 also has a through tweeter channel 310 and a blind-tube-shaped tuning cavity 320. One end of the tweeter channel 310 and the opening end of the tuning cavity 320 are connected 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.

[0039] To improve sound quality, the aperture sizes of the tweeter channel 310, tuning cavity 320, and sound outlet tube 110 should be in a certain proportional ratio. In this invention, the aperture ratio of the tweeter channel 310 to the tuning cavity 320 is 1:1.2-1.8. The aperture ratio of the tweeter channel 310 to the sound outlet tube of the mouthpiece 11 is 1:3-3.2. A preferred embodiment has the following aperture sizes: tweeter channel 310 aperture is 0.8mm, tuning cavity 320 aperture is 1.4mm, and sound outlet tube 110 aperture is 2.5mm. The sound pressure level test curve of the headphones using this invention shows a significant improvement in attenuation in the high-frequency region.

[0040] This invention is not only applicable to in-ear headphones, but also to other headphone products. Of course, the above description is merely a specific embodiment of this invention and is not intended to limit its scope. All equivalent changes or modifications made to the structure, features, and principles described in the claims of this invention should be included within the scope of this invention.

Claims

1. A high and low frequency unit earphone sound cavity sound guiding structure, comprising: An earphone shell having an internal cavity and a speaker unit installed within the cavity, the speaker unit dividing the cavity into a front cavity and a rear cavity, the earphone shell having a mouthpiece communicating with the front cavity and used for outputting 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 at the center of the woofer, and the sound-emitting surfaces of the woofer and tweeter face the same direction; The earphone shell is provided with a sound guide, which has a through high-frequency channel. One end of the high-frequency channel is connected to the sound-emitting surface of the tweeter, and the other end extends to the mouthpiece. The earphone shell has a front tuning hole that communicates with the front cavity and a rear tuning hole that communicates with the rear cavity. The sound generated by the bass unit enters the front cavity and is then transmitted out through the sound nozzle; the sound generated by the tweeter unit is directly transmitted out through the tweeter channel.

2. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 1, characterized in that: The sound guide includes a tweeter tube and a tuning tube. The tweeter channel is located inside the tweeter tube. The tuning tube is a blind tube with a tuning cavity inside. One end of the tuning tube is connected to the sound-emitting surface of the tweeter unit.

3. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 2, characterized in that: The tuning tube is filled with a porous sound damping material.

4. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 2, characterized in that: The sound guide is integrally formed inside the earphone shell. One end of the tweeter tube is 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-emitting surface of the tweeter unit. The other end of the tweeter tube extends to the mouthpiece.

5. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 4, characterized in that: The aperture ratio of the high-frequency channel to the tuning cavity is 1:1.2-1.

8.

6. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 4, characterized in that: The ratio of the aperture of the high-frequency channel to the aperture of the sound outlet tube of the mouthpiece is 1:3-3.

2.

7. A sound-conducting structure for an earphone acoustic cavity with high and low frequency units according to any one of claims 1-6, characterized in that: The loudspeaker 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. The inner bracket has an outwardly extending connecting tube at its center. The tweeter is located at one end of the connecting tube, and one end of the sound guide is inserted into the connecting tube.

8. The sound guiding structure of an earphone acoustic cavity with high and low frequency units according to claim 4, characterized in that: The tweeter unit is a dynamic driver.

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