Loudspeaker for reducing sound leakage by using sound short circuit principle

Abstract

The utility model provides a loudspeaker using the sound short circuit principle to reduce sound leakage, comprising a support and a magnetic circuit assembly arranged on the support, a voice coil is arranged above the magnetic circuit assembly, the voice coil is connected with the back surface of a vibrating diaphragm, the edge of the vibrating diaphragm is fixed with the support, two sides of the support are symmetrically provided with two sound cavity channels, and the two sound cavity channels are communicated with the magnetic circuit assembly. Each sound cavity channel comprises a transmission inlet and a transmission outlet, the transmission outlets and the vibrating diaphragm are both located on the upper end face of the loudspeaker, a sound cavity is formed in the back face of the vibrating diaphragm, and the sound cavity channels are both communicated with the sound cavity. And sound waves emitted by the back surface of the vibrating diaphragm are reflected once through the sound cavity channel and are transmitted out from one side of the front surface of the vibrating diaphragm. The loudspeaker provided by the utility model can reduce sound leakage.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and is a loudspeaker that reduces sound leakage by utilizing the principle of acoustic short circuit. Background Technology

[0002] Acoustic short circuit refers to the phenomenon in an acoustic system where the sound waves in front of and behind the speaker diaphragm interfere with each other, which in some cases leads to a reduction or even cancellation of the sound output. Essentially, this is a case of phase destructive interference.

[0003] Sound leakage refers to the phenomenon where, when using a handset to answer a phone call, some sound, which should only be transmitted to the receiver's ears, leaks into the surrounding environment. For example, sound waves reflect multiple times and spread outwards, allowing people nearby to hear parts of the conversation from the diffused sound waves; this is handset sound leakage.

[0004] To improve the privacy of making and receiving phone calls, this invention proposes a speaker that reduces sound leakage by utilizing the principle of acoustic short circuit. Utility Model Content

[0005] This invention provides a loudspeaker that reduces sound leakage by utilizing the principle of acoustic short circuit, which can effectively solve the above-mentioned problems.

[0006] This utility model is implemented as follows:

[0007] A loudspeaker that reduces sound leakage by utilizing the principle of acoustic short-circuiting includes a bracket and a magnetic circuit assembly disposed on the bracket. A voice coil is disposed above the magnetic circuit assembly and is connected to the back of a diaphragm. The edge of the diaphragm is fixed to the bracket. Two acoustic cavity channels are symmetrically arranged on both sides of the bracket. Each acoustic cavity channel includes an inlet and an outlet. The outlet and the diaphragm are both located on the upper surface of the loudspeaker. An acoustic cavity is formed on the back of the diaphragm. The acoustic cavity channels communicate with the acoustic cavity. Sound waves emitted from the back of the diaphragm are reflected once through the acoustic cavity channels and emitted from the front side of the diaphragm.

[0008] As a further improvement, the acoustic cavity channel has a vertical section and a horizontal section, the horizontal section having an inclined portion near the acoustic cavity, and the inlet being located on the inclined portion.

[0009] As a further improvement, a pressure plate is also provided on the front side of the diaphragm, which presses the edge of the diaphragm tightly onto the bracket.

[0010] As a further improvement, the bracket has a support portion formed in the middle of each of the inlets.

[0011] As a further improvement, the magnetic circuit assembly includes a U-cup, a magnet, and a magnetic core. The U-cup is connected to the bracket, the magnet is located inside the U-cup, and the magnetic core is located above the magnet.

[0012] As a further improvement, the upper end face of the bracket is provided with four positioning posts, and the pressure plate is provided with positioning holes that cooperate with the positioning posts.

[0013] As a further improvement, the bracket is also provided with two wiring channels.

[0014] The beneficial effects of this utility model are:

[0015] By providing two acoustic cavity channels on the speaker, with the outlet direction of the acoustic cavity channels in the same direction as the sound waves emitted from the front of the diaphragm, and the sound waves emitted from the back of the diaphragm being reflected once through the acoustic cavity channels, the sound waves emitted from the back of the diaphragm and the sound waves reflected back after contacting the ear are in opposite phase. When the two meet, they interfere with each other, affecting the normal diffusion of the sound waves and thus reducing sound leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model.

[0018] Figure 2 This is a top view provided in an embodiment of the present utility model.

[0019] Figure 3 yes Figure 2 Sectional view at point AA.

[0020] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0021] Figure 5 This is a schematic diagram of the support structure provided in an embodiment of the present utility model.

[0022] Figure 6 This is a schematic diagram of sound waves provided in an embodiment of this utility model (not actual, for illustration only).

[0023] Figure label:

[0024] 1. Bracket; 11. Sound cavity channel; 111. Inlet; 112. Outlet; 113. Vertical section; 114. Horizontal section; 115. Inclined section; 12. Support section; 13. Positioning post; 2. Diaphragm; 3. Pressure plate; 4. Magnetic circuit assembly; 41. U-cup; 42. Magnet; 43. Core; 5. Voice coil; 6. Wiring channel. Detailed Implementation

[0025] 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, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0026] Reference Figure 1-6 As shown, a loudspeaker that reduces sound leakage by utilizing the principle of acoustic short circuit includes a bracket 1 and a magnetic circuit assembly 4 mounted on the bracket 1. A voice coil 5 is located above the magnetic circuit assembly 4 (i.e., in the direction of sound emission from the loudspeaker). The voice coil 5 is connected to the back of the diaphragm 2 (i.e., the side of the diaphragm 2 facing the inside of the loudspeaker). The edge of the diaphragm 2 is fixed to the bracket 1. Two acoustic cavity channels 11 for conducting sound waves are symmetrically arranged on both sides of the bracket 1. The acoustic cavity channel 11 includes an inlet 111 and an outlet 112. The outlet 112 and the diaphragm 2 are both located on the upper surface of the loudspeaker. The outlet 112 and the front of the diaphragm 2 (i.e., the side of the diaphragm 2 facing the outside of the loudspeaker) emit sound in the same outward direction. An acoustic cavity is formed on the back of the diaphragm 2 after being assembled with the bracket 1 and the magnetic circuit assembly 4. The inlet 111 is located on the cavity wall of the acoustic cavity, so that the acoustic cavity channel 11 communicates with the acoustic cavity. The sound waves emitted from the back of the diaphragm 2 are reflected once through the acoustic cavity channel 11 and exported from the front side of the diaphragm 2.

[0027] When the diaphragm 2 vibrates to produce sound, the sound wave emitted from the front of the diaphragm 2 is sound wave A, and the sound wave emitted from the back of the diaphragm 2 is sound wave B. At this time, sound wave A and sound wave B are out of phase. When sound wave A propagates towards the human ear, it is reflected and diffused away from the ear after encountering the ear, becoming sound wave A'. Sound wave B is reflected once through the acoustic cavity channel 11 and is transmitted from the front side of the diaphragm 2, becoming sound wave B'. At this time, sound wave A' and sound wave B' are out of phase. When sound wave A' and sound wave B' meet, interference occurs. In general, the angle between the propagation directions of sound wave A' and sound wave B' is mostly obtuse, so the interference between sound wave A' and sound wave B' will be between complete destructive and complete constructive, depending on the size of the obtuse angle, which affects the normal diffusion of sound waves and thus reduces sound leakage.

[0028] Specifically, the acoustic cavity channel 11 has a vertical section 113 and a horizontal section 114. The horizontal section 114 has an inclined part 115 near the acoustic cavity. The inlet 111 is located on the inclined part 115. The sound wave enters from the inlet 111, contacts the bottom of the acoustic cavity channel 11 and is reflected, and then passes through the vertical section 113 and exits from the outlet 112. Furthermore, since the support 1 is made of rigid material, the sound wave will be reversed.

[0029] Specifically, a pressure plate 3 is also provided on the front of the diaphragm 2. The pressure plate 3 presses the edge of the diaphragm 2 tightly onto the bracket 1, thereby enhancing the connection stability between the diaphragm 2 and the bracket 1.

[0030] Specifically, the support 1 has a support portion 12 formed in the middle of each inlet 111, which allows the area of ​​the inlet 111 to be set to be larger, and the structure of the support 1 also has high strength.

[0031] Specifically, the magnetic circuit assembly 4 includes a U-cup 41, a magnet 42, and a magnetic core 43. The U-cup 41 is connected to the bracket 1. The magnet 42 is located inside the U-cup 41, the magnetic core 43 is located above the magnet 42, and the voice coil 5 is spaced apart outside the magnet 42 and the magnetic core 43.

[0032] Specifically, the upper surface of the bracket 1 is provided with four positioning posts 13, and the pressure plate 3 is provided with positioning holes that cooperate with the positioning posts 13, which facilitates the positioning of the pressure plate 3 during assembly.

[0033] Specifically, the bracket 1 is also equipped with two wiring channels 6 to facilitate the connection of the voice coil 5 to the outside.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A loudspeaker that reduces sound leakage by utilizing the principle of acoustic short circuit, comprising a bracket (1) and a magnetic circuit assembly (4) disposed on the bracket (1), wherein a voice coil (5) is disposed above the magnetic circuit assembly (4), the voice coil (5) is connected to the back of a diaphragm (2), and the edge of the diaphragm (2) is fixed to the bracket (1), characterized in that: The bracket (1) has two symmetrical acoustic cavity channels (11) on both sides. Each acoustic cavity channel (11) includes an inlet (111) and an outlet (112). The outlet (112) and the diaphragm (2) are both located on the upper surface of the loudspeaker. An acoustic cavity is formed on the back of the diaphragm (2). The acoustic cavity channels (11) are all connected to the acoustic cavity. The sound waves emitted from the back of the diaphragm (2) are reflected once through the acoustic cavity channels (11) and transmitted from the front side of the diaphragm (2).

2. A loudspeaker according to claim 1 that reduces sound leakage by utilizing the principle of acoustic short-circuiting, characterized in that, The acoustic cavity channel (11) has a vertical section (113) and a horizontal section (114). The horizontal section (114) has an inclined portion (115) near the acoustic cavity, and the inlet (111) is located on the inclined portion (115).

3. A loudspeaker according to claim 1 that reduces sound leakage by utilizing the principle of acoustic short-circuiting, characterized in that, The diaphragm (2) is also provided with a pressure plate (3) on its front side, and the pressure plate (3) presses the edge of the diaphragm (2) onto the bracket (1).

4. A loudspeaker that reduces sound leakage by utilizing the principle of acoustic short-circuiting according to claim 1, characterized in that, The bracket (1) has a support portion (12) formed in the middle of each of the inlets (111).

5. A loudspeaker according to claim 1 that reduces sound leakage by utilizing the principle of acoustic short-circuiting, characterized in that, The magnetic circuit assembly (4) includes a U-cup (41), a magnet (42) and a magnetic core (43). The U-cup (41) is connected to the bracket (1). The magnet (42) is located inside the U-cup (41), and the magnetic core (43) is located above the magnet (42).

6. A loudspeaker according to claim 3 that reduces sound leakage by utilizing the principle of acoustic short circuit, characterized in that, The bracket (1) has four positioning posts (13) on its upper end face, and the pressure plate (3) has positioning holes that cooperate with the positioning posts (13).

7. A loudspeaker for reducing sound leakage by utilizing the principle of acoustic short-circuiting according to claim 1, characterized in that, The bracket (1) is also provided with two wiring channels (6).

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