Directive horn structure

Abstract

The utility model relates to the technical field of ultrasonic waves, and discloses a directive horn structure, at least two directive plates are rotatably connected with an external connection structure, the directive plates are arranged side by side, each directive plate comprises a sound wave part, the sound wave part is arranged on one side, far away from the external connection structure, of the directive plate, and the sound wave part is suitable for emitting ultrasonic waves. The sound wave direction is suitable for being perpendicular to the plane of the side, away from the external connecting structure, of the pointing plate, and ultrasonic waves emitted by the sound wave parts of every two adjacent pointing plates form double-slit interference; and the direction adjusting plate is simultaneously connected with the at least two pointing plates and is suitable for synchronously driving the at least two pointing plates to rotate relative to the external connecting structure. Through a double-slit interference ultrasonic structure, directional regulation and control of sound waves are achieved, at least two pointing plates arranged side by side are adopted to form an interference array, a sound wave part configured on each pointing plate can emit ultrasonic waves perpendicular to the plate surface, and it is ensured that adjacent sound wave sources form a stable double-slit interference field.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic technology, specifically to a directional horn structure. Background Technology

[0002] The entrance door voice system is a high-tech security device integrating intelligent voice interaction and access control functions. Through voice recognition, remote intercom, and intelligent control technology, it enables real-time two-way communication between users and visitors. The system is typically equipped with a high-definition camera, microphone, and speaker, supporting remote viewing of visitor images and voice conversations via a mobile app. It can also unlock doors with authorization or be linked to smart home devices. It features facial recognition, motion detection, and anomaly alarms, while being compatible with the smart home ecosystem. Users can control door locks or other home devices via voice commands, balancing security and convenience. Suitable for homes, apartments, and offices, it effectively improves access management efficiency and the living experience.

[0003] In related technologies, entrance door voice systems generally use traditional speaker technology, which has problems such as poor sound propagation directionality and wide sound field coverage. This means that when providing password setting guidance or broadcasting messages in public areas, non-target personnel within 1-2 meters outside the door can clearly receive the sound wave signal, posing a risk of privacy information leakage. This defect is particularly problematic in high-density residential scenarios, creating a sharp contradiction with users' stringent requirements for privacy. On the other hand, simply reducing the volume would directly affect the clarity and convenience of the user's operating experience. Utility Model Content

[0004] In view of this, the present invention provides a directional speaker structure to solve the problems of poor directionality and privacy in voice systems.

[0005] This utility model provides a directional horn structure, including:

[0006] The pointing plate is rotatably connected to an external connection structure. The pointing plate includes at least two pointing plates arranged side by side. Each pointing plate includes an acoustic wave section, which is located on the side of the pointing plate away from the external connection structure. The acoustic wave section is adapted to emit ultrasonic waves, and its acoustic wave direction is adapted to be perpendicular to the plane on the side of the pointing plate away from the external connection structure. The ultrasonic waves emitted by the acoustic wave sections of two adjacent pointing plates form double-slit interference.

[0007] A steering plate, which is connected to at least two pointing plates, is suitable for synchronously driving at least two pointing plates to rotate relative to the external connecting structure.

[0008] Beneficial Effects: This invention achieves directional control of sound waves through a double-slit interference ultrasonic structure. It employs at least two parallel pointing plates forming an interference array. Each pointing plate's acoustic component emits ultrasonic waves perpendicular to the plate surface, ensuring a stable double-slit interference field between adjacent sound sources. The pointing plate, acting as a synchronous drive mechanism, precisely controls the coordinated rotation of all pointing plates, achieving beam steering through mechanical pointing. This avoids the complex circuitry and high costs of traditional acoustic systems, improving not only sound wave pointing accuracy and interference stability but also simplifying the mechanical structure of multi-plate synchronous pointing. It offers higher control efficiency and practical value in fields such as acoustic detection, directional communication, and ultrasonic imaging.

[0009] In one optional embodiment, two connecting blocks are respectively disposed at both ends of the pointer plate along the length direction. The connecting blocks include connecting portions, and the pointer plate also includes a first mounting portion. The connecting portions and the first mounting portions are connected in a one-to-one correspondence.

[0010] Beneficial effects: Independent connecting blocks with connecting parts at both ends of the pointer plate form a mating connection with the first mounting part on the plate body. This double-end fixing structure effectively enhances the rigidity of the pointer plate and suppresses vibration deformation. The modular structure can significantly reduce maintenance costs. By setting the connecting parts and the first mounting part, the parallelism and spacing tolerance between multiple pointer plates are ensured to be within a certain range, providing mechanical protection for forming a stable ultrasonic interference field. While ensuring acoustic performance, this significantly improves the reliability and maintainability of the system.

[0011] In one optional embodiment, the connecting block further includes a connecting portion, which is symmetrically arranged at both ends of the second mounting portion, and the adjusting plate is connected to the connecting portion on the side of the connecting block near the sound wave portion.

[0012] Beneficial effects: This utility model optimizes the power transmission efficiency of the steering plate and the pointing plate assembly through the symmetrically distributed connecting part structure. The connecting blocks are symmetrically arranged at both ends of the second mounting part, so that the steering plate can directly drive the connecting blocks from the side of the sound wave section, avoiding component deformation caused by single-point stress concentration, significantly improving system durability. The connection method close to the sound wave section shortens the power transmission path, reduces the angle error in the transmission process, and ensures the synchronous accuracy of the rotation of multiple pointing plates.

[0013] In one alternative embodiment, one side of the fastener is connected to the connecting part of the connecting block away from the sound wave section, and the other side is fixedly connected to the external connecting structure.

[0014] Beneficial effects: This utility model achieves stable installation and precise positioning of the pointing plate assembly through the optimized design of the fixing component and the connecting block. The fixing component forms a rigid connection node on the side of the connecting block away from the sound wave part, ensuring the stability of the ultrasonic interference field, guaranteeing reliable connection with the external structure, and enabling quick assembly and disassembly of the pointing plate assembly.

[0015] In one alternative embodiment, a locking member is further provided between the connecting part of the connecting block near the sound wave section and the pointing plate, the locking member being adapted to fix and lock the first mounting part and the second mounting part.

[0016] Beneficial effects: This utility model significantly improves the structural stability and assembly precision of the pointer plate assembly through the innovative design of adding a locking component. The locking component forms an elastic constraint at the joint between the connecting block and the pointer plate, ensuring a tight fit between the first mounting part and the second mounting part.

[0017] In one alternative embodiment, the pointer plate is constructed as a semi-cylindrical shape, and the acoustic wave section is disposed on the tangent surface of the semi-cylindrical shape along the length direction of the pointer plate.

[0018] Beneficial effects: By using a semi-cylindrical pointing plate design, the sound wave section is integrated on the cross-section along the length direction to form a continuous linear sound source array. The sound wave section arranged on the cross-section works perfectly with the pointing mechanism, improving the working efficiency of the equipment.

[0019] In one optional implementation, the radius of the semi-cylindrical part of the pointer plate is set to a preset effective radius, and the distance between adjacent pointer plates is L, satisfying: 50cm≤L≤60cm.

[0020] Beneficial effects: By limiting the geometric parameters and spacing of the semi-cylindrical pointer plates, the optimal control of the ultrasonic interference field was achieved. By setting the radius of the semi-cylindrical plate to a preset effective radius and controlling the spacing L between adjacent pointer plates within the range of 50-60cm, a suitable listening experience was obtained at a certain distance in front of the entrance door.

[0021] In one alternative embodiment, the connecting part has a pin hole structure, and the fastener is rotatably connected to the connecting block via a pin.

[0022] Beneficial effects: The rotary connection of the pin and pin hole structure enables dynamic orientation adjustment of the pointing plate assembly. The rotary connection with pin hole fit ensures the positional accuracy of the rotation center of the connection part, effectively suppressing radial movement while ensuring rotational flexibility, thus improving the pointing stability of the ultrasonic beam.

[0023] In one alternative embodiment, the steering plate is connected to the drive mechanism and is adapted to drive the steering plate to move along the length direction of the steering plate.

[0024] Beneficial effects: This utility model achieves synchronous adjustment of the ultrasonic pointing plate array through the cooperation of the drive mechanism and the pointing plate. The linear drive directly controls the displacement of the pointing plate, ensuring the stability of the ultrasonic interference fringes. The linear motion mechanism avoids the backlash that exists in the rotary drive, reducing the synchronization error of the pointing plate.

[0025] In one alternative embodiment, the locking element is a spring, which is sleeved on the second mounting portion.

[0026] Beneficial effects: By setting a spring as the locking element, a dynamic and stable connection between the pointing plate and the connecting block is achieved. The continuous elastic pressure of the spring ensures that the first mounting part and the second mounting part always keep in close contact, reducing the gap at the connection and improving the stability of the system. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the directional horn structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the directional horn structure pointing plate of this utility model;

[0030] Figure 3 This is a schematic diagram of the directional horn structure connecting block of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Directional plate; 11. First mounting part; 12. Acoustic part; 2. Connecting block; 21. Connecting part; 22. Second mounting part; 3. Directional plate; 4. Fixing part; 5. Locking part. Detailed Implementation

[0033] 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. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 according to the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] The entrance door voice system is a high-tech security device that integrates intelligent voice interaction and access control. Through voice recognition, remote intercom, and intelligent control technologies, it enables real-time two-way communication between users and visitors. The system is typically equipped with a high-definition camera, microphone, and speaker, supporting remote viewing of visitor images and voice conversations via a mobile app. It can also unlock doors with authorization or be linked to smart home devices. Furthermore, the system integrates facial recognition, motion detection, and anomaly alarms, and is compatible with mainstream smart home ecosystems. Users can control door locks or other home devices via voice commands, balancing security and convenience. Suitable for homes, apartments, and offices, it significantly improves access management efficiency and the living experience.

[0038] However, existing technologies generally employ traditional speaker solutions, which suffer from poor sound wave directionality and excessively wide coverage. This is particularly problematic when providing password guidance or playing messages in public areas; unauthorized individuals within 1-2 meters of the door may clearly receive the sound signal, posing a risk of privacy breaches. This deficiency is especially pronounced in high-density residential settings, creating a sharp conflict with users' stringent privacy requirements. While traditional solutions, such as simply lowering the volume, can mitigate the leakage problem, they sacrifice the clarity and ease of use of voice interaction, negatively impacting the user experience.

[0039] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a directional horn structure is provided, comprising: a directional plate 1, rotatably connected to an external connecting structure, the directional plate 1 comprising at least two arranged side by side, each directional plate 1 comprising a sound wave portion 12, the sound wave portion 12 being disposed on the side of the directional plate 1 away from the external connecting structure, the sound wave portion 12 being adapted to emit ultrasonic waves, the sound wave direction being adapted to be perpendicular to the plane on the side of the directional plate 1 away from the external connecting structure, and the ultrasonic waves emitted by the sound wave portions 12 of two adjacent directional plates 1 forming double-slit interference; and a directional plate 3, the directional plate 3 being simultaneously connected to at least two directional plates 1, adapted to synchronously drive at least two directional plates 1 to rotate relative to the external connecting structure.

[0041] This invention achieves directional control of sound waves through a double-slit interference ultrasonic structure. It employs at least two parallel pointing plates 1 forming an interference array. Each pointing plate 1 has an acoustic wave section 12 that emits ultrasonic waves perpendicular to the plate surface, ensuring a stable double-slit interference field between adjacent sound sources. The directional adjustment plate 3, acting as a synchronous drive mechanism, precisely controls the coordinated rotation of all pointing plates 1, achieving beam steering through mechanical adjustment. This avoids the complex circuitry and high cost of traditional acoustic systems, improving not only the pointing accuracy and interference stability of the sound waves but also simplifying the mechanical structure of multi-plate synchronous adjustment. It offers higher control efficiency and practical value in fields such as acoustic detection, directional communication, and ultrasonic imaging.

[0042] Specifically, the guide plate 1 is constructed in a semi-cylindrical shape, and the acoustic wave section 12 is disposed on the cross-section of the semi-cylindrical guide plate 1 along its length. Through the design of the semi-cylindrical guide plate 1, the acoustic wave section 12 is integrated on the cross-section along the length direction to form a continuous linear sound source array. The acoustic wave section 12 arranged on the cross-section works perfectly with the direction adjustment mechanism, thereby improving the working efficiency of the equipment.

[0043] It is worth noting that the sound wave section 12 is a device for emitting ultrasonic waves, with an ultrasonic half-power angle of approximately ±15 degrees, a rated power of 50 watts, and a playback power of 5 watts.

[0044] Optionally, there are many ways to rotate the pointer plate 1 to the external connection structure, combined with... Figure 1 and Figure 3 As shown, this application uses a connecting block 2 to connect two connecting blocks 2 respectively disposed at both ends of the pointer plate 1 along the length direction. The connecting block 2 includes a connecting part 21, and the pointer plate 1 also includes a first mounting part 11. The connecting part 21 and the first mounting part 11 are connected in a one-to-one correspondence.

[0045] Independent connecting blocks 2 with connecting parts 21 are provided at both ends of the pointing plate 1, forming a paired connection with the first mounting part 11 on the plate body. This double-end fixed structure can effectively enhance the rigidity of the pointing plate 1 and suppress vibration deformation. The modular structure can significantly reduce maintenance costs. By setting the connecting parts 21 and the first mounting part 11, the parallelism and spacing tolerance between multiple pointing plates 1 are ensured to be within a certain range, providing mechanical protection for the formation of a stable ultrasonic interference field. While ensuring acoustic performance, the reliability and maintainability of the system are significantly improved.

[0046] Furthermore, the connecting block 2 also includes a connecting portion 21, which is symmetrically arranged at both ends of the second mounting portion 22. The directional plate 3 and the connecting portion 21 on the side of the connecting block 2 closest to the acoustic wave section 12 are connected in cooperation. This utility model optimizes the power transmission efficiency of the directional plate 3 and the pointing plate 1 assembly through the symmetrically distributed connecting portion 21 structure. The connecting block 2 is symmetrically arranged at both ends of the second mounting portion 22, so that the directional plate 3 can directly drive the connecting block 2 from the side of the acoustic wave section 12, avoiding component deformation caused by single-point stress concentration, significantly improving system durability. The connection method close to the acoustic wave section 12 shortens the power transmission path, reduces the angular error in the transmission process, and ensures the synchronous accuracy of the rotation of multiple pointing plates 1.

[0047] Specifically, the connecting part 21 has a pin hole structure, and the fixing member 4 is rotatably connected to the connecting block 2 via a pin. This rotatable connection of the pin and pin hole structure enables dynamic orientation adjustment of the pointing plate 1 assembly. The pin-hole mating rotatable connection ensures the positional accuracy of the rotation center of the connecting part 21, effectively suppressing radial movement while maintaining rotational flexibility, thus improving the pointing stability of the ultrasonic beam.

[0048] Specifically, the connecting blocks 2 are connected in the middle by a long strip-shaped column or square structure.

[0049] In some embodiments, combined with Figure 1 As shown, one side of the fixing member 4 is connected to the connecting part 21 on the side of the connecting block 2 away from the acoustic wave section 12, and the other side is fixedly connected to the external connecting structure. This invention achieves stable installation and precise positioning of the pointing plate 1 assembly through the optimized design of the fixing member 4 and the connecting block 2. The fixing member 4 forms a rigid connection node on the side of the connecting block 2 away from the acoustic wave section 12, ensuring the stability of the ultrasonic interference field, guaranteeing reliable connection with the external structure, and enabling quick assembly and disassembly of the pointing plate 1 assembly.

[0050] In some embodiments, combined with Figure 1As shown, a locking member 5 is also provided between the connecting portion 21 of the connecting block 2 near the acoustic wave section 12 and the pointing plate 1. The locking member 5 is suitable for fixing and locking the first mounting portion 11 and the second mounting portion 22. This utility model, through the innovative design of adding the locking member 5, significantly improves the structural stability and assembly accuracy of the pointing plate 1 assembly. The locking member 5 forms an elastic constraint at the joint between the connecting block 2 and the pointing plate 1, enabling a tight fit between the first mounting portion 11 and the second mounting portion 22.

[0051] Furthermore, the locking element 5 is a spring, which is sleeved on the second mounting part 22. By setting the spring as the locking element 5, a dynamic and stable connection between the pointing plate 1 and the connecting block 2 is achieved. The continuous elastic pressure of the spring ensures that the first mounting part 11 and the second mounting part 22 always remain tightly fitted, reducing the gap at the connection and improving the stability of the system. The long strip structure in the middle of the connecting block 2 passes through the center of the spring, so that the two ends of the spring generate abutment force.

[0052] In some embodiments, combined with Figure 1 As shown, the directional plate 3 is connected to the drive mechanism and is suitable for driving the directional plate 3 to move along its length. This invention achieves synchronous adjustment of the ultrasonic pointing plate array 1 through the cooperation of the drive mechanism and the directional plate 3. Linear drive is used to directly control the displacement of the directional plate 3, ensuring the stability of the ultrasonic interference fringes. The linear motion mechanism avoids the backlash present in rotary drive, reducing the synchronization error of the pointing plate 1.

[0053] In some embodiments, the radius of the semi-cylindrical pointer 1 is set to a preset effective radius, and the distance between adjacent pointers 1 is L, satisfying: 50cm≤L≤60cm. By limiting the geometric parameters and spacing configuration of the semi-cylindrical pointers 1, the optimal control of the ultrasonic interference field is achieved. By setting the radius of the semi-cylindrical pointer to a preset effective radius and controlling the distance L between adjacent pointers 1 within the range of 50-60cm, a suitable listening experience is obtained at a certain distance in front of the entrance door.

[0054] The preset effective radius is calculated using the formula sin(θ) = 0.61 * λ / A, which is the half-power beam angle of the ultrasonic sensor. Here, θ is the main lobe diffraction angle, λ is the wavelength of the sound wave (λ ≈ 8.6 mm for 40 kHz ultrasound), and A is the effective radius. When A = 5 mm, θ = 61°; when A = 10 mm, θ = 25°. Since a half-power beam angle of approximately ±15 degrees allows for comfortable hearing for two people sitting side-by-side at a distance of 0.8 meters from a door, A = 10 mm is chosen.

[0055] When calculating the distance between two adjacent pointer plates 1, the distance between adjacent peaks in double-slit interference should be less than the width of an average person's head. According to the double-slit interference formula Δy = λL / d, where Δy is the distance between adjacent peaks, λ is the wavelength of the sound wave (λ≈8.6mm for 40kHz ultrasound), L is the distance from the speaker to the ear (preferably 800mm), and d is the double-slit distance, i.e., the distance between the two pointer plates 1. When d = 50mm, Δy = 137mm; when d = 60mm, Δy = 114mm. According to data released by the National Health Department, the average head width of Chinese adolescents aged 16-17 is 169mm for boys and 164mm for girls, while the head diameter of adults is approximately 18-25cm. Since there are multiple peaks between the ears, a distance greater than 50mm is chosen between adjacent pointer plates 1.

[0056] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A directional horn structure, characterized in that, include: A pointing plate (1) is rotatably connected to an external connection structure. The pointing plate (1) includes at least two arranged side by side. Each pointing plate (1) includes an acoustic wave section (12). The acoustic wave section (12) is located on the side of the pointing plate (1) away from the external connection structure. The acoustic wave section (12) is adapted to emit ultrasonic waves. Its acoustic wave direction is adapted to be perpendicular to the plane on the side of the pointing plate (1) away from the external connection structure. The ultrasonic waves emitted by the acoustic wave sections (12) of two adjacent pointing plates (1) form double-slit interference. The steering plate (3) is connected to at least two of the pointing plates (1) and is adapted to synchronously drive at least two of the pointing plates (1) to rotate relative to the external connection structure.

2. The directional horn structure according to claim 1, characterized in that, It also includes connecting blocks (2), two connecting blocks (2) are respectively disposed at both ends of the pointer plate (1) along the length direction, the connecting block (2) includes a connecting part (21), the pointer plate (1) also includes a first mounting part (11), the connecting part (21) and the first mounting part (11) are connected one-to-one.

3. The directional horn structure according to claim 2, characterized in that, The connecting block (2) also includes a connecting part (21) and a second mounting part (22). The connecting part (21) is symmetrically arranged at both ends of the second mounting part (22). The adjusting plate (3) is connected to the connecting part (21) on the side of the connecting block (2) near the sound wave part (12).

4. The directional horn structure according to claim 3, characterized in that, Also includes: The fastener (4) is connected on one side to the connecting part (21) of the connecting block (2) away from the acoustic part (12), and on the other side to the external connecting structure.

5. The directional horn structure according to claim 3, characterized in that, A locking member (5) is also provided between the connecting part (21) of the connecting block (2) on the side near the sound wave part (12) and the pointing plate (1). The locking member (5) is adapted to fix and lock the first mounting part (11) and the second mounting part (22).

6. The directional horn structure according to claim 1, characterized in that, The pointing plate (1) is constructed in the shape of a semi-cylinder, and the acoustic wave part (12) is disposed on the cross-section of the semi-cylinder along the length direction of the pointing plate (1).

7. The directional horn structure according to claim 6, characterized in that, The radius of the semi-cylindrical part of the pointing plate (1) is set to a preset effective radius, and the distance between adjacent pointing plates (1) is L, which satisfies: 50cm≤L≤60cm.

8. The directional horn structure according to claim 4, characterized in that, The connecting part (21) has a pin hole structure, and the fixing member (4) is rotatably connected to the connecting block (2) through a pin shaft.

9. The directional horn structure according to claim 3, characterized in that, The steering plate (3) is connected to the driving mechanism and is adapted to drive the steering plate (3) to move along the length direction of the steering plate (3).

10. The directional horn structure according to claim 5, characterized in that, The locking element (5) is a spring, which is sleeved on the second mounting part (22).

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