Directional sound field loudspeaker, assembly jig and assembly process of directional sound field loudspeaker

Abstract

The directional sound field loudspeaker comprises a support, a voice coil, a diaphragm and a reflecting cover, the support is a support with two open ends, a sound production module is installed in a containing cavity, the sound production module mainly comprises a vibrating diaphragm, a magnet and the voice coil, the vibrating diaphragm is fixed on the voice coil, the voice coil is wound around the magnet, and the diaphragm is fixed on the magnet. A reflecting cover is arranged outside the sound production module vibrating diaphragm, and the sound production module vibrating diaphragm and the reflecting cover are tightly connected. The manufacturing cost of the directional sound field loudspeaker is reduced by additionally arranging the reflecting cover, the size of the directional sound field loudspeaker is reduced, the working efficiency and the energy utilization rate of the directional sound field loudspeaker are improved, the assembling process of the directional sound field loudspeaker is simplified by researching and developing a special assembling jig and designing a simple and efficient assembling process, and the production efficiency of the directional sound field loudspeaker is improved. The problem of errors of an existing assembly process is effectively solved, the dependence on the technical level of operators is reduced, and the production efficiency and the stability of product quality are improved.

Description

Technical Field

[0001] The present technology mainly relates to the technical field of audio equipment, and in particular to a directional sound field speaker for generating sound propagation in a specific area. Background Art

[0002] This technology is mainly applicable to occasions that require directional control of the sound propagation range, such as conference systems, public broadcasting systems, and vehicle-mounted audio systems. With the continuous development and popularization of conference systems, public broadcasting systems, and vehicle-mounted audio systems, the demand for technology that can directional control the sound propagation range is becoming more urgent.

[0003] In conference systems, directional sound positioning can ensure that participants can clearly hear the speaker's voice and avoid echoes and reverberations caused by disordered diffusion of sound in the space, thereby improving the communication efficiency and quality of the meeting. Public broadcasting systems, such as in large public places such as shopping malls and stations, need to transmit sound in a directionally directed manner to specific areas, which can ensure effective communication of information without causing unnecessary noise interference to surrounding areas. In car audio systems, directional control of the direction of sound propagation can create a higher-quality, immersive audio experience for passengers in the car, while reducing sound pollution to the environment outside the car.

[0004] Traditional directional sound field speakers are mostly designed in omnidirectional or semi-directional modes. Omnidirectional speakers emit sound evenly in all directions, making it difficult to focus the sound in a specific target area, resulting in a waste of sound energy in non-target directions, and easy to cause mutual interference of sound in complex environments. Although the semi-directional design limits the propagation direction of sound to a certain extent, it still cannot meet some application scenarios that require extremely high sound directionality. This limited directivity and large diffusion angle make it difficult to achieve accurate positioning and uniform coverage of sound in spaces such as conference rooms and theaters. In a conference room, the sound may be too loud in some areas and too quiet in other areas; in a theater, the audience in the back row may not be able to clearly hear the sound details on the stage, while the audience in the front row may be impacted by too strong sound, affecting the overall auditory effect.

[0005] From the perspective of the macro-technological development trend and the evolution of actual social needs, people's pursuit of sound quality has reached a new height. Especially in high-noise environments, such as public broadcasting areas near factory workshops and construction sites, or car audio environments next to busy streets, the requirements for sound clarity and privacy are more significant. Therefore, developing a speaker that can propagate sound in a directional manner has become an important research direction. Several common specific solutions in the prior art include: Solution 1: Use multiple small speaker arrays and combine them with electronic phased array technology to achieve the effect of directional sound propagation. The outstanding advantage of this technical solution is that it can flexibly and accurately adjust the propagation direction of the sound waves by accurately controlling the phase and amplitude of the sound waves emitted by each small speaker to meet the diverse needs of sound coverage areas in different scenarios. However, in the actual large-scale application process, due to its complex hardware structure, it is necessary to equip a large number of small speakers and corresponding high-precision electronic control equipment, which greatly increases the overall hardware cost. At the same time, the combination of many devices has also led to a sharp increase in the difficulty of system maintenance. Once a component fails, the workload of troubleshooting and repair is huge. This series of factors seriously limits the widespread promotion and popularization of this solution in the market.

[0006] Solution 2: Use horn-type speakers with strong directivity. This type of speaker can effectively concentrate and directionalize sound energy through its unique horn shape design, thereby significantly improving the efficiency and intensity of sound during long-distance transmission, and has certain advantages in some large outdoor venues or long-distance broadcasting scenarios. However, on the other hand, its large size and relatively fixed structure make it difficult to perform in some application scenarios that require compact space layout, such as small conference rooms, in-car audio systems, etc., and cannot meet the urgent needs of these scenarios for miniaturization and integration of equipment.

[0007] Solution 3: Use digital signal processing technology to achieve directional emission control of sound waves through complex algorithms at the software level. The advantage of this method is its high flexibility and programmability. It can achieve a variety of sound wave directional modes through software adjustments according to different application scenarios and user needs. However, since the directional processing of sound waves requires a large amount of real-time computing resources to support complex algorithm operations, this places extremely high demands on the computing power of the device. In practical applications, the real-time performance of sound wave orientation is often greatly reduced due to the limitations of hardware computing power, resulting in sound delays, freezes and other phenomena, affecting the smoothness and accuracy of sound propagation. Moreover, high-intensity computing tasks also significantly increase the power consumption of the device, which is undoubtedly a fatal disadvantage for some portable devices that rely on batteries or systems with strict requirements on energy consumption.

[0008] Although the above solutions have their own advantages, they also have obvious shortcomings. The cost of multi-speaker arrays is high, the size of horn speakers is large, and digital signal processing technology is limited by computing power and energy consumption. These factors make the existing technologies not widely used in practical applications, especially in situations that require high efficiency, low cost, and low power consumption. Summary of the invention

[0009] The problem to be solved by the present invention is to provide a directional sound field speaker unit, an assembly jig and an assembly process. Compared with the prior art, this technology mainly solves the problem of reducing the manufacturing cost of the directional sound field speaker, making it easier to mass produce and promote. Reduce the volume of the directional sound field speaker to better adapt to various compact installation environments. Improve the working efficiency and energy utilization of the directional sound field speaker and reduce energy consumption. Simplify the assembly process of the directional sound field speaker and improve production efficiency and product quality. To achieve the above purposes, the present invention adopts the following technical solutions: A directional sound field speaker comprises a bracket, a voice coil, a diaphragm and a reflective cover, wherein the bracket is an open-ended bracket, the bracket comprises a first ring wall and a second ring wall, the first ring wall and the second ring wall constitute an accommodating cavity, a sound module is installed in the accommodating cavity, the sound module mainly comprises a diaphragm, a large magnet, a small magnet and a voice coil, wherein the diaphragm is fixed on the voice coil, the voice coil is wound around the magnet, a reflective cover is arranged outside the diaphragm of the sound module, and the diaphragm of the sound module and the reflective cover are tightly connected.

[0010] As a preferred solution, a reflective cover is provided on the sound-emitting module close to the diaphragm, and the reflective cover is in a parabolic shape and is placed in front of the sound-emitting module.

[0011] As a preferred solution, the reflector can be replaced with reflectors of different shapes and sizes according to actual needs to adjust the propagation of sound waves.

[0012] As a preferred solution, the top washer, large magnet, large washer, small magnet, small washer and magnetic circuit in the first ring wall are sequentially formed by stacking the upper inner magnetic ring and the lower inner magnetic ring, and the outer ring magnetic circuit is sequentially formed by stacking the upper outer magnetic ring and the lower outer magnetic ring.

[0013] As a preferred solution, the directional sound field speaker is placed in a closed housing with sound absorbing materials inside to reduce unnecessary resonance and noise.

[0014] As a preferred solution, a temperature compensation device is added to the sound module to prevent performance degradation in a high temperature environment.

[0015] An assembly jig is used to assemble the above-mentioned directional sound field speaker. The assembly jig includes a positioning fixture, a fastening device and a detection instrument. The positioning fixture is used to ensure the position accuracy of each component, the fastening device is used to fix each component, and the detection instrument is used to test the quality parameters of the finished product.

[0016] An assembly process of a directional sound field speaker, wherein the directional sound field speaker is the above-mentioned directional sound field speaker, and the assembly process comprises the following steps: Step 1: Install the voice coil on the voice coil jig, pick out the defective voice coils such as scattered wires and deformations, lay the bottom of the voice coil lead flat downwards, lead the lead to the plug gauge and clamp it; Step 2: Use a CCD magnifying glass to check the voice coil to see if it is installed flat, if the lead wire curvature is moderate, if the lead wire outlet points are symmetrical, and if the lead wire outlet points are 180 degrees. Step 3: Put the bracket on the bracket jig, assemble the bracket flatly on the bracket jig, close the mold of the bracket jig and the voice coil jig, weld the lead with a spot welder, close the mold in the correct direction, remove the voice coil jig with the straight line, pull out the lead to test the continuity, remove the lead from the jig plug gauge, use the jig to push out the voice coil jig, pull out the excess lead, and pick out the defective products with no circuit conduction; Step 4: Check the appearance with a CCD magnifying glass, add protective glue to the solder joints and irradiate with UV lamp, apply glue to cover the spot welding parts, and the energy range of UV lamp is: 3500+1000mJ / cm2.

[0017] Preferably, the method further comprises the following steps: Step 5: Add adhesive to the contact point between the step inside the bracket and the voice coil lead to fix the lead; Step 6: Place the diaphragm on the diaphragm jig, add glue to the center of the diaphragm, place the diaphragm flat on the diaphragm jig, and apply glue to the center; Step 7: Add adhesive to the left and right ends of the diaphragm film paper, wrap the voice coil lead to fix the lead, irradiate the membrane glue mold fixture with UV light, add adhesive to mold the diaphragm fixture and bracket fixture; Step 8: Take the diaphragm jig, put the ejector jig into the diaphragm jig, press the diaphragm to take out the diaphragm jig, install the turnover steel cover to mold the turnover speaker, and irradiate with UV light.

[0018] Preferably, the method further comprises the following steps: Step 9: Place the jig with the semi-finished speaker on the glue dispenser, apply glue along the inner side of the bracket, install the unmagnetized magnet into the bracket with the adhesive, and check whether the magnet is missing corners or the electroplating layer is missing; Step 10: After installing the magnet, put it on the glue dispenser, add adhesive, install the pre-made magnetic circuit in the bracket with adhesive, put the speaker with magnetic circuit in the magnetizing head for magnetization, use tweezers to stick the prepared tuning mesh to the position of the middle hole of the top washer, and stick the reflective cover to the diaphragm of the sound module to ensure that there is no gap between the two; Step 11: Place the speaker on the microphone of the polarity meter, touch the pin of the speaker with the test pen, touch the frequency needle with the listening test pen to sweep the frequency, eliminate abnormal sounds, test the curve, and ensure that it meets the standard requirements. If there are unqualified items, return to the corresponding process for correction until it is qualified.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly reduces the manufacturing cost of the directional sound field speaker by adding a reflective cover, reduces the volume of the directional sound field speaker, and improves the working efficiency and energy utilization rate of the directional sound field speaker. By developing special assembly jigs and designing simple and efficient assembly processes, the assembly process of the directional sound field speaker is simplified, the error problem of the existing assembly process is effectively solved, the dependence on the technical level of the operator is reduced, the production efficiency and the stability of product quality are improved, and it is ensured that each product can meet high-standard performance requirements.

[0020] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of an embodiment of the present invention; Figure 2 is another exploded view of an embodiment of the present invention; Figure 3 is another exploded view from a different angle of an embodiment of the present invention; Figure 4 It is a three-dimensional diagram of an embodiment of the present invention.

[0022] Description of the accompanying drawings: 1. Sound module; 2. Reflector; 3. Shell; 1. Tuning mesh; 2. Top washer; 3. Large magnet; 4. Dahuasi; 5. Small magnet; 6. Small Washi; 7. Voice coil; 8. Bracket; 9. Diaphragm. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be noted that directional words such as the terms "up", "down", "front", "back", "left", "right", etc., which indicate directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0024] In order to better understand the purpose, structure and function of the present invention, a directional sound field speaker, an assembly jig and an assembly process of the directional sound field speaker of the present invention are further described in detail. This scheme includes a directional sound field speaker unit, an assembly jig and an assembly process. The directional sound field speaker unit consists of a sound module 1, a reflector 2 and a shell 3. The bracket 18 is an open-ended bracket, the bracket includes a first ring wall and a second ring wall, the first ring wall and the second ring wall constitute a containing cavity, the sound module is installed in the containing cavity, the sound module 1 mainly includes a tuning mesh 11, a top washer 12, a large washer 14, a small washer 16, a diaphragm 19, a large magnet 13, a small magnet 15 and a voice coil 17, wherein the diaphragm 19 is fixed on the voice coil 17, and the voice coil 17 is wound around the large magnet 13 and the small magnet 15. The reflector 2 is in the shape of a parabola and is located in front of the sound module 1 for gathering and guiding sound waves. The shell 3 is a closed box with sound-absorbing materials inside to reduce unnecessary resonance and noise.

[0025] When an electrical signal is input to the voice coil, a changing magnetic field is generated, causing the air near the magnet to vibrate, which in turn drives the diaphragm to move and emit sound waves. The reflective cover focuses the sound waves into a narrow beam within a certain angle, thereby achieving directional propagation of sound.

[0026] Assembly jigs include positioning fixtures, fastening devices and testing instruments. Positioning fixtures are used to ensure the position accuracy of each component, fastening devices are used to fix each component, and testing instruments are used to test the quality parameters of the finished product.

[0027] The directional sound field speaker assembly process includes the following steps: Step 1: Install the voice coil 17 on the voice coil jig, pick out the defective voice coils such as scattered wires and deformations, lay the bottom of the voice coil lead wire downward, and lead the lead wire to the plug gauge and clamp it; Step 2: Use a CCD magnifying glass to inspect the voice coil bracket, check whether the voice coil 17 is installed flat, whether the lead wire curvature is moderate, and whether the lead wire outlet points are symmetrical, with an angle of 180 degrees; Step 3: Put the bracket 18 on the bracket jig, assemble the bracket flatly on the bracket jig, close the mold of the bracket jig and the voice coil jig, weld the leads with a spot welder, close the mold in the correct direction, and remove the voice coil jig flatly. Pull out the leads to test the continuity, remove the leads from the jig plug gauge, and use the jig to push out the voice coil jig. Pull out the excess leads and pick out the defective products with no circuit conduction; Step 4: Check the appearance with a CCD magnifying glass, add protective glue to the solder joints and irradiate with UV light, apply glue to cover the spot welding parts, and the energy range of the UV light is: 3500+1000mJ / cm2; Step 5: Add adhesive to the contact point between the step inside the bracket 18 and the voice coil lead to fix the lead; Step 6: Place the diaphragm 19 on the diaphragm jig, add glue to the center of the diaphragm 19, place the diaphragm flatly on the diaphragm jig, and apply glue to the center; Step 7: Add adhesive to the left and right ends of the diaphragm film paper, wrap the voice coil lead to fix the lead, and irradiate the membrane glue mold fixture with UV light on the bracket 18, and add adhesive to mold the diaphragm fixture bracket; Step 8: Take the diaphragm jig, put the ejector jig into the diaphragm jig, press the diaphragm 19 to take out the diaphragm jig, install the turnover steel cover to close the turnover speaker, and irradiate with UV light; Step 9: Place the jig with the speaker semi-finished product on the glue dispenser, apply glue along the inner side of the bracket, install the unmagnetized large magnet 13 and the small magnet 15 into the bracket 18 with the adhesive added, and check whether the magnet is missing corners or the electroplating layer is missing; Step 10: After installing the magnet, put it on the glue dispenser, add adhesive, install the pre-made magnetic circuit in the bracket with adhesive, put the speaker with magnetic circuit in the magnetizing head for magnetization, use tweezers to stick the prepared tuning mesh 11 to the position of the middle hole of the top washer 12, and stick the reflector 2 to the diaphragm 19 of the sound module to ensure that there is no gap between the two; Step 11: Place the speaker on the microphone of the polarity meter, touch the pin of the speaker with the test pen, touch the frequency needle with the listening test pen to sweep the frequency, eliminate abnormal sounds, test the curve, and ensure that it meets the standard requirements. If there are unqualified items, return to the corresponding process for correction until it is qualified.

[0028] The diaphragm material is polyester fiber composite material, which has good flexibility and durability; the magnet is neodymium iron boron permanent magnet, which has high magnetic flux density and stability; the voice coil is wound with copper wire, which has excellent conductivity. The reflector is made of aluminum alloy, and the surface is anodized to enhance wear resistance and aesthetics. The shell is made of ABS plastic, which is lightweight and has good sound insulation. Diaphragms of different materials can be selected, such as paper cones, metal membranes, etc., to meet different sound characteristics. In addition to neodymium iron boron permanent magnets, other types of magnets can also be selected, such as aluminum nickel cobalt magnets, ferrite magnets, etc.; reflectors of different shapes and sizes can be replaced according to actual needs to adjust the propagation direction and range of sound waves. In order to further optimize the performance of directional sound field speakers, a temperature compensation circuit can be added to the sound module to prevent performance degradation in high temperature environments; active noise reduction function can be added inside the shell to further improve the sound quality; more advanced materials and technologies, such as carbon nanotube diaphragms and ultra-thin coils, are used to improve overall performance.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A directional sound field speaker, comprising a bracket (18), a voice coil (17), a diaphragm (19) and a reflective cover (2), characterized in that: The bracket (18) is a bracket with two ends open. The bracket (18) comprises a first ring wall and a second ring wall, the first ring wall and the second ring wall constitute a containing cavity, the sound module (1) is installed in the containing cavity, the sound module (1) mainly comprises a diaphragm (19), a large magnet (13), a small magnet (15) and a voice coil (17), wherein the diaphragm (19) is fixed on the voice coil (17), the voice coil (17) is wound around the magnet, a reflection cover (2) is arranged outside the diaphragm (19) of the sound module, and the diaphragm (19) of the sound module and the reflection cover (2) are tightly connected.

2. The directional sound field speaker according to claim 1, characterized in that: The sound-generating module (1) is provided with a reflection cover (2) in close contact with the diaphragm (19); the reflection cover (2) is in a parabolic shape and is placed in front of the sound-generating module (1).

3. The directional sound field speaker according to claim 1, characterized in that: The reflection cover (2) can be replaced with a reflection cover of different shapes and sizes according to actual needs, so as to adjust the propagation of sound waves.

4. The directional sound field speaker according to claim 1, characterized in that: The magnetic circuit of the top washer (12), large magnet (13), large washer (14), small magnet (15) and small washer (16) in the first ring wall is formed by stacking an upper inner magnetic ring and a lower inner magnetic ring in sequence, and the outer ring magnetic circuit is formed by stacking an upper outer magnetic ring and a lower outer magnetic ring in sequence.

5. The directional sound field speaker according to claim 1, characterized in that: The directional sound field speaker is placed in a closed housing (3), and sound absorbing material is provided inside to reduce unnecessary resonance and noise.

6. The directional sound field speaker according to claim 1, characterized in that: A temperature compensation device is added to the sound-generating module (1) to prevent performance degradation in a high-temperature environment.

7. An assembly jig, characterized in that: It is used to assemble the directional sound field speaker described in any one of claims 1 to 6. The assembly jig includes a positioning fixture, a fastening device and a detection instrument. The positioning fixture is used to ensure the position accuracy of each component, the fastening device is used to fix each component, and the detection instrument is used to test the quality parameters of the finished product.

8. An assembly process for a directional sound field speaker, characterized in that: The directional sound field speaker is a directional sound field speaker according to any one of claims 1 to 6, and the assembly process includes the following steps: Step 1: Install the voice coil (17) on the voice coil jig, pick out defective voice coils such as loose wires and deformations, lay the bottom of the voice coil lead wire downward, and lead the lead wire to the plug gauge and clamp it; Step 2: Use a CCD magnifying glass to check the voice coil (17) to see if it is installed flat, if the lead wire curvature is appropriate, and if the lead wire outlet points are symmetrical and present an angle of 180 degrees. Step 3: Place the bracket (18) on the bracket jig, assemble the bracket (18) flatly on the bracket jig, close the mold of the bracket jig and the voice coil jig, weld the lead wire with a spot welder, close the mold in the correct direction, close the wire flatly, remove the voice coil jig, remove the lead wire to test the continuity, remove the lead wire from the jig plug gauge, use the jig to push out the voice coil jig, remove the excess lead wire, and select the defective products with no circuit conduction; Step 4: Check the appearance with a CCD magnifying glass, add protective glue to the solder joints and irradiate with UV lamp, apply glue to cover the spot welding parts, and the energy range of UV lamp is: 3500+1000mJ / cm2.

9. The assembly process of the directional sound field speaker according to claim 8, characterized in that: The following steps are also included: Step 5: Add adhesive to the contact point between the step inside the bracket and the voice coil lead to fix the lead; Step 6: Place the diaphragm (19) on the diaphragm jig, add glue to the center of the diaphragm (19), place the diaphragm (19) flatly on the diaphragm jig, and apply glue to the center; Step 7: Add adhesive to the left and right ends of the diaphragm film paper, wrap the voice coil lead to fix the lead, irradiate the membrane glue mold fixture with UV light, add adhesive to mold the diaphragm fixture and bracket fixture; Step 8: Take the diaphragm jig, put the ejector jig into the diaphragm jig, press the diaphragm (19), take out the diaphragm jig, install the turnover steel cover, close the mold of the turnover speaker, and irradiate with UV light.

10. The assembly process of the directional sound field speaker according to claim 8, characterized in that: The following steps are also included: Step 9: Place the jig with the semi-finished speaker on the glue dispenser, apply glue along the inner side of the bracket, install the unmagnetized magnet into the bracket with the adhesive, and check whether the magnet is missing corners or the electroplating layer is missing; Step 10: After the magnet is installed, place it on the glue dispenser, add adhesive, install the pre-made magnetic circuit in the bracket with the adhesive, place the speaker with the magnetic circuit installed in the magnetizing head, and magnetize it. Use tweezers to stick the prepared tuning mesh (11) to the position of the middle hole of the top washer (12), and stick the reflective cover (2) to the diaphragm (19) of the sound module to ensure that there is no gap between the two. Step 11: Place the speaker on the microphone of the polarity meter, touch the pin of the speaker with the test pen, touch the frequency needle with the listening test pen to sweep the frequency, eliminate abnormal sounds, test the curve, and ensure that it meets the standard requirements. If there are unqualified items, return to the corresponding process for correction until it is qualified.

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