Sound cavity structure of treble and bass loudspeaker

Abstract

The utility model discloses a treble and bass loudspeaker sound cavity structure which is characterized in that the structure comprises a sound cavity housing and a loudspeaker, the sound cavity housing comprises a treble cavity and a bass cavity, the treble cavity and the bass cavity are connected through a narrowing channel, the loudspeaker is arranged on the treble cavity, the back face of the loudspeaker faces the inside of the treble cavity, and the back face of the loudspeaker faces the inside of the bass cavity. The side wall of the bass cavity is provided with a sound outlet hole. According to the utility model, the low-frequency response range is expanded by using Helmholtz resonance according to the acoustic principle of the inverter tube, the bandwidth of medium and low frequencies is actively expanded, the bandwidth of cavity re-amplification is improved, the intensity of large-caliber medium and low frequencies can be achieved by using a small-caliber loudspeaker, and the tone quality performance of the medium and low frequencies is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and more specifically to a high and low frequency loudspeaker cavity structure. Background Technology

[0002] Currently, the speakers configured in electronic keyboards on the market generally have a relatively simple structure and poor sound quality, which cannot better match the human ear's perception of timbre. They are mainly designed for the extension of mid and low frequencies. The traditional closed-box design has a simple structure, a high resonant frequency of the cavity, and a narrow reproduction bandwidth, which is not suitable for improving sound quality. Utility Model Content

[0003] To solve the above problems, this utility model provides the following technical solution:

[0004] A high-frequency and low-frequency loudspeaker acoustic cavity structure includes an acoustic cavity housing and a loudspeaker. The acoustic cavity housing includes a high-frequency cavity and a low-frequency cavity, which are connected by a narrowing channel. The loudspeaker is disposed on the high-frequency cavity, with the back of the loudspeaker facing the inside of the high-frequency cavity. The side wall of the low-frequency cavity has a sound outlet.

[0005] The present invention is further configured such that: one end of the narrowing channel is connected to the high-frequency cavity and the other end is connected to the low-frequency cavity; both ends of the narrowing channel are provided with horn openings; and the connection between the horn openings and the high-frequency and low-frequency cavities is an arc-shaped transition.

[0006] The present invention is further configured such that both the high-frequency cavity and the low-frequency cavity are rectangular, and the area of ​​the high-frequency cavity is larger than the area of ​​the low-frequency cavity.

[0007] The present invention is further configured such that: a sound cavity cover is provided on the sound cavity housing, the loudspeaker is fixed on the sound cavity cover, and there is a gap between the back of the loudspeaker and the inner bottom wall of the high-frequency cavity.

[0008] The present invention is further configured such that: a stepped surface is provided on the acoustic cavity cover, the edge of the speaker is attached to the stepped surface, a fixing frame is fixed on the acoustic cavity cover on the stepped surface, and the speaker is clamped and fixed by the stepped surface and the fixing frame.

[0009] The present invention is further configured such that: a first sealing foam is provided between the top edge of the speaker and the fixing frame, and a second sealing foam is provided between the bottom edge of the speaker and the stepped surface.

[0010] The present invention is further configured such that a third sealing foam is provided between the sound cavity cover and the sound cavity shell.

[0011] The present invention is further configured such that: the front of the speaker is covered with a first dustproof mesh, and the outside of the sound outlet is covered with a second dustproof mesh.

[0012] The present invention is further configured to include a housing, wherein the top and side walls of the housing are respectively provided with a high-frequency hole and a low-frequency hole, the sound cavity housing is fixed inside the housing, the front of the speaker faces the high-frequency hole, and the sound outlet faces the low-frequency hole.

[0013] Compared with the prior art, the present invention has at least the following advantages:

[0014] 1. The speaker features a separate tweeter and woofer design, with the back of the speaker facing inwards. The tweeter cavity narrows and then widens to reach the woofer (narrowing the channel) to conduct sound. Utilizing the acoustic principle of a bass reflex port, the speaker leverages Helmholtz resonance to extend the low-frequency response range. The internal cavity resonance generates even lower frequencies, actively expanding the mid-low frequency bandwidth. This allows even a small speaker to achieve the low-frequency intensity of a large-diameter speaker, significantly improving mid-low frequency sound quality.

[0015] 2. The narrowing of the channel with horn-shaped openings at both ends and the use of arc transitions can significantly reduce airflow resistance during sound wave transmission, reduce high-frequency harmonic distortion, reduce interference caused by sound wave radiation to the edges, and make the frequency response flatter.

[0016] 3. By clamping the first sealing foam and the second sealing foam on the upper and lower sides of the speaker respectively, a dynamic damping system is formed, which reduces harmonic distortion as a whole, and also effectively prevents sound leakage and external noise interference, thereby improving the purity and clarity of the sound. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the acoustic cavity housing in this embodiment;

[0018] Figure 2 This is a schematic diagram of the acoustic cavity shell alone;

[0019] Figure 3 It is a three-dimensional sectional view of the acoustic cavity shell;

[0020] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0021] Figure 5 This is an exploded view diagram of this embodiment;

[0022] Figure 6 This is a frontal view of the entire embodiment;

[0023] Figure 7 This is a schematic diagram of the back of the entire embodiment.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Acoustic cavity housing; 101. Tweeter cavity; 102. Bass cavity; 103. Narrowing channel; 2. Loudspeaker; 3. Sound outlet; 4. Horn mouth; 5. Acoustic cavity cover; 6. Stepped surface; 7. Fixing bracket; 8. First sealing foam; 9. Second sealing foam; 10. Third sealing foam; 11. First dustproof mesh; 12. Second dustproof mesh; 13. Outer shell; 14. Tweeter hole; 15. Bass hole; 16. Positioning post. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] A high-frequency and low-frequency speaker cavity structure, such as Figures 1 to 3 As shown, the device includes a sound cavity housing 1 and a speaker 2. The sound cavity housing 1 includes a tweeter 101 and a woofer 102, which are connected by a narrowing channel 103. The speaker 2 is mounted on the tweeter 101 with its back facing inward. The woofer 102 has a sound outlet 3 on its side wall. The vibration behind the speaker 2 amplifies the sound waves in the tweeter 101. Through the bass reflex principle of the narrowing channel 103, the amplified bass is transmitted to the woofer 102, thus enabling a small speaker to achieve the low-frequency intensity of a large-diameter speaker, significantly improving the mid-low frequency sound quality.

[0029] One end of the narrowing channel 103 is connected to the tweeter 101, and the other end is connected to the woofer 102. Both ends of the narrowing channel 103 are equipped with horn openings 4, which narrow the tweeter 101 and then expand it to the woofer 102, completing the sound transmission. Furthermore, the connection between the horn opening 4 and the tweeter 101 and woofer 102 is an arc-shaped transition. Since the acoustic design of the bass reflex port requires a large space, an arc-shaped transition acoustic scheme is adopted for the horn opening 4 to prevent wind noise, reducing the load impedance of the airflow and thus reducing wind speed. The horn opening 4 design also reduces interference caused by sound wave radiation to the edges, resulting in a flatter frequency response.

[0030] In this embodiment, both the high-frequency cavity 101 and the low-frequency cavity 102 are rectangular. The area of ​​the high-frequency cavity 101 is larger than that of the low-frequency cavity 102, so that it meets the larger space required for the acoustic design of the bass reflex port.

[0031] A cavity cover 5 is attached to the cavity housing 1 by screws, forming a sealed space. The speaker 2 is fixed to the cavity cover 5, with its front exposed. There is a gap between the back of the speaker 2 and the inner bottom wall of the tweeter cavity 101, forming a buffer cavity that effectively absorbs the back wave energy of the speaker 2 and reduces standing wave interference.

[0032] like Figures 3 to 5 As shown, the acoustic cavity cover 5 has a through hole, and an annular stepped surface 6 is provided around the through hole. The peripheral wall of the speaker 2 has a protruding edge that fits into the stepped surface 6. The acoustic cavity cover 5 is fixed with a fixing bracket 7 on the stepped surface 6. The fixing bracket 7 presses on the speaker 2 and is locked to the acoustic cavity cover 5 with screws. Therefore, the speaker 2 is clamped and fixed by the stepped surface 6 and the fixing bracket 7.

[0033] The top of the acoustic cavity cover 5 has two positioning posts 16 protruding. The fixing frame 7 has positioning holes that cooperate with the positioning posts 16. The positioning posts 16 are aligned with the positioning holes and inserted, so that the four corners of the fixing frame 7 can be quickly aligned with the acoustic cavity cover 5 and screws can be tightened. This can further improve the stability of the fixing frame 7.

[0034] A first sealing foam 8 is disposed between the top edge of the speaker 2 and the mounting bracket 7, and a second sealing foam 9 is disposed between the bottom edge of the speaker 2 and the stepped surface 6. The first sealing foam 8 is sandwiched between the top edge and the mounting bracket 7, and the second sealing foam 9 is sandwiched between the bottom edge and the stepped surface 6. This forms a dynamic damping system, which reduces harmonic distortion as a whole, and also effectively prevents sound leakage and external noise interference, thereby improving the purity and clarity of the sound.

[0035] Regarding the timbre of speaker 2, this embodiment selects a more common paper pulp material. Compared with metal or PP materials, paper pulp has a better balance coefficient of damping and strength, which is more in line with the natural reproduction timbre and the human ear's perception of timbre.

[0036] A third sealing foam 10 is also provided between the sound cavity cover 5 and the sound cavity housing 1 to further improve the sealing performance of the sound cavity 101 and the housing 1. The third sealing foam 10 is arranged in a ring along the edge of the sound cavity housing 1, and has through holes for screws to pass through.

[0037] To prevent dust particles from affecting the speaker 2, a first dustproof mesh 11 is covered on the front of the speaker 2, and a second dustproof mesh 12 is covered on the outside of the sound outlet 3. Both the first dustproof mesh 11 and the second dustproof mesh 12 are made of sandwich mesh fabric to ensure that there will be no abnormal noise caused by resonance.

[0038] like Figure 6 and Figure 7 As shown, the high and low frequency speaker cavity structure of this embodiment also includes a housing 13. The housing 13 includes an upper shell and a lower shell, which are fixed together by screws. The top and side walls of the housing 13 are respectively provided with a high-frequency hole 14 and a low-frequency hole 15. The cavity housing 1 is fixed inside the housing 13 by screws. The front of the speaker 2 faces the high-frequency hole 14, and the sound outlet 3 faces the low-frequency hole 15. The speaker 2 emits sound through the high-frequency hole 14, and the sound outlet 3 of the low-frequency cavity 102 emits sound through the low-frequency hole 15. The first dustproof mesh 11 and the second dustproof mesh 12 are sandwiched between the cavity housing 1 and the housing 13.

[0039] The working process of this utility model:

[0040] When the high and low frequency speaker cavity structures are working, the back vibration of speaker 2 excites sound pressure in the high frequency cavity 101. The sound waves are initially enhanced through the sealed space of the high frequency cavity 101, effectively absorbing the back wave energy. Using the Helmholtz resonance principle, the resonance of the low frequency cavity 102 is excited, expanding the low frequency response range. The sound waves in the high frequency cavity 101 are conducted to the low frequency cavity 102 through the narrowing channel 103, enabling the small-diameter speaker 2 to output the low frequency intensity of a large-diameter speaker, meeting the high requirements of instruments such as electronic keyboards for timbre.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-frequency and low-frequency loudspeaker acoustic cavity structure, characterized in that: The device includes a sound cavity housing and a loudspeaker. The sound cavity housing includes a high-frequency cavity and a low-frequency cavity, which are connected by a narrowing channel. The loudspeaker is mounted on the high-frequency cavity with its back facing the inside of the high-frequency cavity. The side wall of the low-frequency cavity has a sound outlet.

2. The high and low frequency loudspeaker acoustic cavity structure according to claim 1, characterized in that: One end of the narrowing channel is connected to the high-frequency cavity and the other end is connected to the low-frequency cavity. Both ends of the narrowing channel are provided with horn openings, and the connection between the horn openings and the high-frequency and low-frequency cavities is an arc-shaped transition.

3. The high and low frequency loudspeaker acoustic cavity structure according to claim 1, characterized in that: Both the high-frequency cavity and the low-frequency cavity are rectangular, and the area of ​​the high-frequency cavity is larger than that of the low-frequency cavity.

4. The high and low frequency loudspeaker acoustic cavity structure according to claim 1, characterized in that: The acoustic cavity housing is covered with an acoustic cavity cover, the loudspeaker is fixed on the acoustic cavity cover, and there is a gap between the back of the loudspeaker and the inner bottom wall of the tweeter cavity.

5. The high and low frequency speaker cavity structure according to claim 4, characterized in that: The acoustic cavity cover has a stepped surface, the edge of the loudspeaker is attached to the stepped surface, the acoustic cavity cover is fixed to the stepped surface with a fixing frame, and the loudspeaker is clamped and fixed by the stepped surface and the fixing frame.

6. The high and low frequency speaker cavity structure according to claim 5, characterized in that: A first sealing foam is provided between the top edge of the speaker and the mounting bracket, and a second sealing foam is provided between the bottom edge of the speaker and the stepped surface.

7. The high and low frequency loudspeaker acoustic cavity structure according to claim 4, characterized in that: A third sealing foam is provided between the sound cavity cover and the sound cavity shell.

8. The high and low frequency loudspeaker acoustic cavity structure according to claim 1, characterized in that: The front of the speaker is covered with a first dustproof mesh, and the outside of the sound outlet is covered with a second dustproof mesh.

9. The high and low frequency loudspeaker acoustic cavity structure according to claim 1, characterized in that: It also includes a housing, the top and side walls of which are respectively provided with a high-frequency hole and a low-frequency hole. The sound cavity housing is fixed inside the housing, the front of the speaker faces the high-frequency hole, and the sound outlet faces the low-frequency hole.

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