Ear clamping type Bluetooth earphone based on flexible C-shaped bridge integrated inverter tube

Abstract

The invention discloses an ear clamping type Bluetooth earphone based on a flexible C-shaped bridge integrated inverter tube, which is characterized in that a bass inverter tube is integrated in a flexible C-shaped bridge connecting a left earphone body and a right earphone body, and a Helmholtz resonant cavity is formed by an original hollow wiring channel of the bridge body; and the other end is provided with a hidden phase inversion hole at the inner arc side of the C-shaped bridge to lead to the atmosphere, and the resonant frequency is tuned to a range of 100-300Hz. According to the design, on the premise of not increasing the volume of a rear cavity of the loudspeaker and the overall size of the earphone, the low-frequency response performance is improved in a physical acoustic tuning mode (the sound pressure level at a frequency point of 100Hz is improved by about 5dB), and meanwhile, the appearance integrity and the wearing stability of a product are kept; the problem of low-frequency attenuation of the ear-clamping type earphone is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of audio equipment, and in particular relates to an ear-clip type Bluetooth headset based on a flexible C-shaped bridge integrated inverted tube. Background Art

[0002] In recent years, TWS (True Wireless Stereo) Bluetooth headsets have gradually become mainstream. As an emerging wearing style, clip-on Bluetooth headsets have gradually gained market favor due to their advantages such as comfort, no pressure, and stability. Clip-on Bluetooth headsets typically consist of two units, one integrating the battery / PCBA and the other integrating the speaker. A flexible curved connecting bridge (commonly called a flexible C-shaped bridge) clamps to the auricle for stable wearing.

[0003] However, clip-on Bluetooth headphones also have significant acoustic performance limitations. For example, due to the long distance between the speaker outlet and the ear canal (usually >5mm) and the limited size of the speaker unit (equivalent diameter is usually ≤13mm), the overall sound pressure level is severely attenuated, and the low-frequency response (below 300Hz) is significantly weaker than that of in-ear and semi-in-ear headphones, affecting the listening experience. To solve this problem, the industry currently generally uses the EQ module or DSP algorithm module of the Bluetooth chip to forcibly increase the amplitude of the chip's low-frequency output electrical signal, but this often brings the risk of increased distortion and even clipping.

[0004] In addition, traditional in-ear or semi-in-ear Bluetooth headphones improve low-frequency response by designing a bass reflex tube in the rear cavity of the speaker. This method does not increase distortion and the bass sounds natural. However, the bass reflex tube occupies a part of the rear cavity volume. The structural limitations of clip-on Bluetooth headphones make the rear cavity of the speaker small, making it difficult to arrange an effective reflex channel.

[0005] Therefore, how to effectively improve the low-frequency output of clip-on Bluetooth headsets without increasing the volume and affecting wearing comfort is a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0006] The present invention aims to provide an ear-clip Bluetooth headset based on a flexible C-shaped bridge integrated inverted tube, which solves the technical problem of the inherent contradiction between the miniaturized cavity and low-frequency enhancement of existing ear-clip Bluetooth headsets.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The application discloses a clamp ear type Bluetooth earphone based on a flexible C-shaped bridge integrated inverse phase tube, which comprises an concha cavity shell, a post-aural shell and a flexible C-shaped bridge, the concha cavity shell is internally provided with an earphone sound production module, the post-aural shell is internally provided with a mainboard module and a battery module, the flexible C-shaped bridge is connected to the concha cavity shell and the post-aural shell to form an auricle clamping structure, the flexible C-shaped bridge is internally provided with an inverse phase tube channel, the rear side of the concha cavity shell is provided with a loudspeaker rear cavity, one end of the inverse phase tube channel is connected to the loudspeaker rear cavity, and the other end of the inverse phase tube channel extends to the flexible C-shaped bridge to form an inverse phase hole in communication with the atmosphere.

[0009] Further, the resonance frequency f of the inverse phase tube channel satisfies the Helmholtz resonance equation: b

[0010]

[0011] Wherein c is the sound speed, S is the average cross-sectional area of the inverse phase tube channel, V is the net volume of the loudspeaker rear cavity, and L is the effective length of the inverse phase tube channel.

[0012] Further, the resonance frequency of the inverse phase tube channel is 100Hz-300Hz.

[0013] Further, the inverse phase hole is arranged on the inner arc side of the flexible C-shaped bridge.

[0014] Further, the connection part between the end of the inverse phase tube channel and the loudspeaker rear cavity is provided with a sealing structure.

[0015] Further, the shape of the inverse phase hole is circular, elliptical, micropore array or slit type opening.

[0016] Compared with the prior art, the application has the beneficial effects that: the low-frequency inverse phase tube is integrated in the hollow channel of the C-shaped bridge, the Helmholtz resonance structure is realized by using the original wiring channel without occupying the loudspeaker rear cavity space and increasing the earphone volume, the low-frequency response performance is significantly improved (the sound pressure level at 100Hz frequency point is improved by about 5dB) in a physical acoustics tuning mode, the inverse phase hole is secretly arranged on the inner arc side of the C-shaped bridge, the product appearance and wearing stability are completely preserved, and finally, the low-frequency attenuation problem is effectively solved and the user listening experience is improved while maintaining the open wearing advantage of the clamp ear type earphone. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application without constituting a limitation of the application. In the drawings:

[0018] Figure 1 It is a structural schematic view of the clamp ear type Bluetooth earphone based on the flexible C-shaped bridge integrated inverse phase tube. ​

[0019] Figure 2 Schematic diagram of the arrangement of the inverter tube channel in the flexible C-shaped bridge;

[0020] Figure 3 Schematic diagram of the position of the inverter hole in the earphone wearing state;

[0021] Figure 4 Schematic diagram of the comparison of the horn output frequency response curves before and after the design of the inverter tube. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] The present application will be further described in detail below in combination with the embodiments.

[0024] A specific embodiment of a clamp ear type Bluetooth earphone based on a flexible C-shaped bridge integrated inverter tube provided by the present application:

[0025] As shown in Figures 1-3 A clamp ear type Bluetooth earphone based on a flexible C-shaped bridge integrated inverter tube, comprising an conchal cavity shell 1, a post-aural shell 2 and a flexible C-shaped bridge 3, the conchal cavity shell 1 is provided with an earphone sound generating module; the post-aural shell 2 is provided with a mainboard module and a battery module; the flexible C-shaped bridge 3 is made of soft elastic material and is connected to the conchal cavity shell 1 and the post-aural shell 2 to form an auricle clamping structure; in this embodiment, an inverter tube channel 4 is arranged in the flexible C-shaped bridge 3, the rear side of the conchal cavity shell 1 is provided with a horn rear chamber 6, one end of the inverter tube channel 4 is a connecting end 5, the connecting end 5 is connected to the horn rear chamber 6, in order to ensure the acoustic conduction path to be closed and effective, a sealing structure (silicone ring or UV curing sealant layer) can be arranged at the connection between the connecting end 5 and the horn rear chamber 6, the other end of the inverter tube channel 4 extends to the flexible C-shaped bridge 3 to form an inverter hole 7 communicating with the atmosphere, in order to avoid affecting the integrity of the appearance of the earphone, the inverter hole 7 can be opened in the inner arc side of the flexible C-shaped bridge 3, such a design is not easy to be detected by the outside world and does not affect the wearing stability and the overall appearance of the earphone.

[0026] The length and diameter of the inverter tube channel 4 are optimized according to the net volume of the horn rear chamber 6 and the target low frequency response through acoustic calculation, based on the Helmholtz resonance principle, the resonance frequency f b of the inverter tube channel 4 satisfies:

[0027]

[0028] where c is the speed of sound, S is the average cross-sectional area of the inverse phase tube channel 4, V is the net volume of the horn back chamber 6, and L is the effective length of the inverse phase tube channel 4, which refers to the distance from the connecting end 5 of the flexible C-shaped bridge 3 to the inverse phase hole 7. Preferably, the tuning range of the resonance frequency of the inverse phase tube channel 4 is 100 Hz to 300 Hz, so as to effectively improve the low frequency response.

[0029] The shape of the inverse phase hole 7 can be selected from regular or irregular shapes such as a circle, an ellipse, a racetrack, etc., or can be a micro-hole array or a slit type opening, so as to reduce wind noise.

[0030] Through the above design, the present application can effectively enhance the low frequency diving capability and low frequency energy output, and improve the user listening experience, without increasing the size of the earphone, by using the cavity structure of the original C-shaped bridge wiring and adding a low frequency inverse phase tube.

[0031] As shown in FIG. 6, under the simulation conditions of the same horn unit and cavity structure, the acoustic performance of the two schemes is compared: the solid line is the reference scheme without integrated inverse phase tube, and the dashed line is the C-shaped bridge integrated inverse phase tube scheme of the present application. By simulating the user wearing state and measuring the frequency response curve at the eardrum, it can be observed that the low frequency sound pressure level output of the integrated inverse phase tube scheme is about 5 dB higher than that of the reference scheme near the 100 Hz frequency point, which significantly improves the low frequency listening experience. Figure 4

[0032] It should be noted that in this document, terms such as "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles, or devices.

[0033] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.​

Claims

1. A Bluetooth earphone based on a flexible C-shaped bridge integrated inverter tube, comprising a concha cavity shell, a post-auricle shell and a flexible C-shaped bridge, wherein the concha cavity shell is provided with an earphone sound emitting module; the post-auricle shell is provided with a mainboard module and a battery module; the flexible C-shaped bridge is connected to the concha cavity shell and the post-auricle shell to form an auricle clamping structure, characterized in that: The flexible C-shaped bridge is provided with a phase inverter channel, the rear side of the concha cavity shell is provided with a rear cavity chamber of the horn, one end of the phase inverter channel is connected to the rear cavity chamber of the horn, and the other end of the phase inverter channel extends to the flexible C-shaped bridge to form a phase inverter hole communicating with the atmosphere. ​ 2. The in-ear Bluetooth earphone based on the flexible C-shaped bridge integrated inverted phase tube according to claim 1, characterized in that: The resonant frequency f of the inverter tube channel b satisfies the Helmholtz resonance equation: Wherein c is the sound velocity, S is the average cross-sectional area of the phase inverter channel, V is the net volume of the rear cavity chamber of the horn, and L is the effective length of the phase inverter channel.

3. The in-ear Bluetooth earphone based on the flexible C-shaped bridge integrated inverted phase tube according to claim 2, characterized in that: The tuning range of the resonance frequency of the phase inverter channel is 100Hz-300Hz.

4. The in-ear Bluetooth earphone based on the flexible C-shaped bridge integrated inverted phase tube according to claim 3, characterized in that: The phase inverter hole is arranged on the inner arc side of the flexible C-shaped bridge.

5. The in-ear Bluetooth earphone based on the flexible C-shaped bridge integrated inverted phase tube according to claim 4, characterized in that: The connection between the end of the phase inverter channel and the rear cavity chamber of the horn is provided with a sealing structure.

6. The in-ear Bluetooth earphone based on the flexible C-shaped bridge integrated inverted phase tube according to claim 5, characterized in that: The shape of the phase inverter hole is circular, elliptical, micropore array or slit type opening.

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