Noise reducing earphone

Abstract

This invention discloses a noise-canceling headphone, comprising two symmetrically arranged earcups and an arc-shaped headband. Each earcup has a sound-isolating cover fixedly connected to its adjacent sides. A rectangular opening is formed at the upper end of each earcup's side closest to the other. A vertical plate is slidably connected within each rectangular opening. A connecting plate is rotatably connected to the upper end of each vertical plate. The ends of each connecting plate away from the vertical plates are hinged to the end of the headband. A torsion spring is fitted onto the hinge shaft at the position where it engages with the headband. The two ends of the torsion spring are fixedly connected to the hinge shaft and the headband, respectively. Pressure sensors are embedded on adjacent sides of each earcup, inside the sound-isolating cover. This invention enables real-time monitoring of earcup pressure, electric adjustment of the headband curvature, automatic unlocking and relaxation, and angle memory reset. It also supports manual switching of protection modes, balancing noise cancellation effectiveness and wearing comfort.

Description

Technical Field

[0001] This invention relates to the field of noise-canceling headphone technology, and more particularly to a noise-canceling headphone. Background Technology

[0002] Over-ear noise-canceling headphones, with their excellent noise isolation and immersive audio experience, have become a common portable electronic device in scenarios such as office work, commuting, and studying. Their core advantage lies in effectively isolating external environmental noise through the combination of physical sound isolation and active noise cancellation technology, creating a quiet listening environment for users. However, existing over-ear noise-canceling headphones still have many technical shortcomings in terms of wearing experience and structural design that urgently need to be addressed, making it difficult to meet users' needs for prolonged wear.

[0003] Currently, most over-ear noise-canceling headphones on the market use either a fixed elastic structure or a manually adjustable structure for the headband. The former cannot adjust the contact pressure between the earcups and ears according to different users' head shapes and wearing habits, easily leading to poor head circumference fit and excessive local compression. While the latter can achieve basic tightness adjustment, the adjustment process is cumbersome, and there is no precise angle memory function after adjustment. Users need to repeatedly adjust it every time they wear it, greatly reducing its convenience. At the same time, the existing headphone adjustment structure lacks a reliable locking mechanism. Some products are prone to headband loosening during use due to vibration or external force, resulting in a decrease in earcup fit. This not only affects wearing stability but also reduces the physical sound isolation effect, thereby weakening the overall noise cancellation performance.

[0004] More importantly, most existing over-ear noise-canceling headphones lack ear pressure monitoring and automatic relaxation mechanisms. To ensure noise cancellation, users typically adjust the earcups to a tight fit. However, prolonged pressure can impede blood circulation in the ear, causing ear pain, stuffiness, and discomfort. In severe cases, it can even cause continuous pressure damage to the ear skin and cartilage, significantly limiting the headphones' usability for extended periods. While some high-end models attempt to incorporate simple pressure relief structures, these are mostly passive elastic cushioning designs. They cannot actively and precisely adjust pressure based on actual wearing pressure and usage duration. Furthermore, their structural linkages are poor, with unlocking and locking operations operating independently, making it difficult to achieve a dynamic balance between fit and comfort.

[0005] Therefore, a noise-canceling headphone needs to be designed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a noise-canceling headphone. This invention enables real-time monitoring of earcup pressure, electric adjustment of headband curvature, automatic unlocking and relaxation, and angle memory reset. It also supports manual switching of protection modes, balancing noise cancellation effect and wearing comfort.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A noise-canceling headphone includes two symmetrically arranged earcups and an arc-shaped headband. Soundproof covers are fixedly connected to adjacent sides of the two earcups. A rectangular opening is provided at the upper end of the side of each earcup that is close to the other. A vertical plate is slidably connected to each of the two rectangular openings. A connecting plate is rotatably connected to the upper end of each of the two vertical plates. The end of each connecting plate away from the vertical plate is rotatably connected to the end of the headband via a hinge. A torsion spring is fitted on the hinge shaft at a position that mates with the headband. The two ends of the torsion spring are fixedly connected to the hinge shaft and the headband, respectively. Pressure sensors are embedded on adjacent sides of both earmuffs and inside the soundproof enclosure; each earmuff contains an adjustment assembly, and a release assembly that cooperates with the adjustment assembly is also provided inside the earmuff; a micro motor is fixedly installed on the right inner wall of the earmuff, and an encoder is fixedly installed on the left inner wall of the earmuff; the encoder is driven by the adjustment assembly, and the micro motor is engaged with the adjustment assembly for transmission; a tightening switch and a loosening switch are embedded in the outer wall of the earmuff, and a control switch assembly for controlling the power supply to and from the release assembly is also provided on the outer wall of the earmuff.

[0008] Preferably, the adjustment assembly includes a spool shaft rotatably connected to the inner wall of the left side of the earmuff, a spool body fixedly connected to the outer wall of the spool shaft, a pull rope wound around the spool body, the end of the pull rope away from the spool body being fixedly connected to the lower end of the vertical plate, and a ratchet fixedly connected to the outer wall of the spool shaft; two fixing rods are fixedly connected to the inner wall of the right side of the earmuff, the ends of the two fixing rods away from the earmuff are jointly fixedly connected to a fixing ring sleeved on the outside of the spool shaft, two crossbars are rotatably connected to the fixing ring, and the ends of the two crossbars near the ratchet are each fixedly connected to a pawl that engages with the ratchet; fixing boxes are fixedly connected to the inner walls of the front and rear sides of the earmuff, a T-shaped slider is horizontally slidably connected inside the fixing box, a second spring is fixedly connected between the T-shaped slider and the inner wall of the fixing box away from the crossbars, limit blocks are fixedly connected to the inner top and bottom of the fixing box, a second rack is fixedly connected to the end of the T-shaped slider near the crossbars, and a third gear that meshes with the second rack is fixedly connected to the outer walls of the two crossbars.

[0009] Preferably, the release assembly includes a rectangular box fixedly connected to the inner wall of the right side of the earcup. An electromagnet is embedded in the inner wall of the rectangular box near the fixing ring. A moving block is horizontally slidably connected inside the rectangular box. A first spring is fixedly connected between the electromagnet and the adjacent side of the moving block. A first rack is fixedly connected to the end of the moving block away from the electromagnet. A rotating rod is rotatably connected inside the rectangular box. Both ends of the rotating rod pass through the rectangular box. A second gear that meshes with the first rack is fixedly connected to the outer wall of the rotating rod inside the rectangular box. Both ends of the rotating rod extending outside the rectangular box are fixedly connected to rectangular rods. A connecting rod is rotatably connected to the ends of the two rectangular rods away from the rotating rod. The ends of the two connecting rods away from the rectangular rods are rotatably connected to the ends of the two second racks away from the T-shaped slider, respectively.

[0010] Preferably, the output shaft of the micro motor is fixedly connected to the motor shaft, a first gear is fixedly connected to the motor shaft, and a fourth gear is fixedly connected to the outer wall of the spool shaft, with the first gear meshing with the fourth gear; the input shaft of the encoder is coaxially fixedly connected to the end of the spool shaft away from the ratchet via an elastic coupling.

[0011] Preferably, both the tightening switch and the loosening switch are electrically connected to the main control chip of the earphone. The tightening switch is used to drive the output shaft of the micro motor to rotate clockwise, and the loosening switch is used to synchronously drive the electromagnet to be energized and the output shaft of the micro motor to rotate counterclockwise.

[0012] Preferably, the control switch assembly includes a ring fixedly connected to the outer wall of the earcup. The inner wall of the ring has two symmetrically formed arc-shaped grooves along the circumference. A short rod is rotatably connected to the outer wall of the earcup and located inside the ring. A switching block that fits against the inner wall of the ring is fixedly connected to the outer wall of the short rod. A conductive contact is embedded inside the switching block. Both ends of the switching block extend into the corresponding arc-shaped grooves. The inner walls of the two arc-shaped grooves are each embedded with a conductive block that cooperates with the conductive contact. A knob is fixedly connected to the end of the short rod away from the earcup.

[0013] Preferably, the pull cord is a low-elongation, high-strength nylon cord, and a wear-resistant guide sleeve is embedded at the point where the pull cord passes through the inner wall of the earcup. The headband is an arc-shaped beam made of elastic metal, and the outer side of the headband is wrapped with a flexible sponge protective layer.

[0014] Preferably, the pressure sensor is a flexible thin-film pressure sensor, which is fitted to the inner curved surface of the soundproof cover; the earcups are also equipped with a main control chip and a power supply battery, and the main control chip is electrically connected to the pressure sensor, encoder, micro motor, electromagnet, tightening switch, loosening switch and conductive block respectively.

[0015] The present invention has the following beneficial effects: 1. Compared with the prior art, the present invention monitors the contact pressure between the earcups and the ears in real time by setting a pressure sensor inside the earcups, and realizes the electric adjustment of the headband curvature by cooperating with the motor-driven adjustment component, which replaces the traditional manual adjustment method. The adjustment accuracy is higher, and the pressure of the earcups can be precisely controlled according to the pressure data to avoid ear discomfort caused by excessive compression, while taking into account both the sealing performance of noise reduction and wearing comfort.

[0016] 2. Compared with the prior art, the present invention sets up a one-way locking structure of ratchet and pawl and links it with the release component driven by electromagnet. This not only ensures the structural stability of the headband after adjustment and prevents the pull rope from being released by the pull wheel, but also enables the lock to be quickly released through the loosening switch or protection mode. Combined with the reverse rotation of the micro motor, the ear cup pressure is quickly relaxed. The structure has strong linkage and is easy to operate.

[0017] 3. Compared with the prior art, the present invention uses an encoder coaxially connected to the spool shaft to monitor the rotation angle of the spool in real time. It can accurately memorize the user's preset headband bending angle. After automatic relaxation, the micro motor can drive the spool to reset according to the angle signal of the encoder, restoring the wearing pressure to the user's accustomed level, eliminating the need for repeated adjustments and improving the user experience.

[0018] 4. Compared with the prior art, the present invention adds a control switch component. Users can freely switch the wearing protection mode on and off by rotating the knob. After the protection mode is turned on, the main control chip can automatically trigger the release component and loosening action according to the detection data of the pressure sensor and the preset wearing time, so as to realize the timed automatic relaxation of the ear cup pressure, forming a closed-loop control of wearing protection, which is suitable for long-term wearing.

[0019] 5. Compared with the prior art, the adjustment, release, and control components of the present invention are all integrated inside the earcups, with a compact structure and reasonable layout. It does not change the overall appearance of the over-ear noise-canceling headphones, and all mechanical linkage structures adopt a miniaturized design to fit the small internal space of the earcups. At the same time, low-power motors and sensors are selected to balance functionality and headphone battery life.

[0020] In summary, this invention, through the combination of mechanical structure and intelligent control, achieves precise monitoring, electric adjustment, automatic relaxation, and angle memory reset of earcup pressure. It also supports free switching of protection modes, effectively solving the problems of ear discomfort, cumbersome adjustment, and lack of automatic protection in existing over-ear noise-canceling headphones after prolonged wear. The invention features a reasonable structural design, strong linkage, and excellent wearing experience, and has high practical value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a noise-canceling headphone proposed in this invention; Figure 2This is a schematic diagram of the internal structure of the earcups; Figure 3 This is a cross-sectional view of the earcups; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the control switch assembly.

[0022] In the diagram: 1. Earmuff, 2. Ring, 3. Knob, 4. Tightening switch, 5. Loosening switch, 6. Headband, 7. Soundproof cover, 8. Vertical plate, 9. Connecting plate, 10. Pull rope, 11. Fixing ring, 12. Ratchet, 13. Miniature motor, 14. Motor shaft, 15. First gear, 16. Fixing rod, 17. Pawl, 18. Rectangular rod, 19. Rectangular box, 20. Electromagnet, 21. First spring, 22. Moving block, 23. Rotating rod, 24. Second gear, 25. First rack, 26. Horizontal bar, 27. Third gear, 28. Fixing box, 29. Second spring, 30. Limiting block, 31. T-shaped slider, 32. Second rack, 33. Thread wheel body, 34. Fourth gear, 35. Connecting rod, 36. Thread wheel shaft, 37. Arc groove, 38. Short rod, 39. Switching block, 40. Conductive block. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] Reference Figures 1-5A noise-canceling headphone includes two symmetrically arranged earcups 1 and an arc-shaped headband 6. The two earcups 1 and the headband 6 together form the main structure of the over-ear noise-canceling headphone. Soundproof covers 7 are fixedly connected to adjacent sides of the two earcups 1. A rectangular opening is provided at the upper end of the side of the two earcups 1 closest to each other. A vertical plate 8 is vertically slidably connected to each of the two rectangular openings. A connecting plate 9 is rotatably connected to the upper end of each of the two vertical plates 8. The end of each connecting plate 9 away from the vertical plate 8 is rotatably connected to the end of the headband 6 via a hinge. The rotation direction of the hinge is adapted to the up-and-down sliding motion of the vertical plate 8. A torsion spring is fitted on the hinge pivot at the position where it engages with the headband 6. The torsion spring is in an initial elastic support state, and its two ends are fixedly connected to the hinge pivot and the headband 6, respectively. Pressure sensors are embedded on adjacent sides of the two earcups 1 and inside the soundproof cover 7. The pressure sensors can transmit the detected pressure signals to the main control chip of the headphones in real time. An adjustment component is provided inside each of the two earcups 1. A release component that cooperates with the adjustment component is also provided inside the earcup 1. A micro motor 13 is fixedly installed on the inner wall of the right side of the earcup 1. An encoder is fixedly installed on the inner wall of the left side of the earcup 1. The encoder is used to detect the rotation angle of the adjustment component in real time and transmit the angle signal to the main control chip. The encoder is connected to the adjustment component for transmission, and the micro motor 13 is engaged with the adjustment component for transmission. A tightening switch 4 and a loosening switch 5 are embedded on the outer wall of the earcup 1. A control switch component for controlling the power supply of the release component is also provided on the outer wall of the earcup 1.

[0025] The adjustment assembly includes a reel shaft 36 rotatably connected to the inner left wall of the earcup 1. The reel shaft 36 is rotatably connected to the inner left wall of the earcup 1 via a bearing. A reel body 33 is fixedly connected to the outer wall of the reel shaft 36. A pull rope 10 is wound around the reel body 33. The pull rope 10 is a low-elongation, high-strength nylon rope. A wear-resistant guide sleeve is embedded at the point where the pull rope 10 passes through the inner wall of the earcup 1. The headband 6 is an arc-shaped beam made of elastic metal. The outer side of the headband 6 is wrapped with flexible sponge. The protective layer has a pull cord 10, the end of which is away from the main body 33 of the reel fixedly connected to the lower end of the vertical plate 8. The winding and unwinding of the pull cord 10 can drive the vertical plate 8 to slide back and forth vertically along the rectangular opening. A ratchet 12 is fixedly connected to the outer wall of the reel shaft 36. Two fixing rods 16 are fixedly connected to the inner right side of the earmuff 1. The ends of the two fixing rods 16 away from the earmuff 1 are jointly fixedly connected to a fixing ring 11 sleeved on the outside of the reel shaft 36. Two horizontal bars 26 are rotatably connected to the fixing ring 11. Each end of lever 26 near ratchet 12 is fixedly connected to a pawl 17 that engages with ratchet 12. The one-way engagement of ratchet 12 and pawl 17 is used to limit the reverse rotation of the spool shaft 36 and prevent the pull rope 10 from releasing on its own. A fixing box 28 is fixedly connected to the inner walls of both the front and rear sides of the earmuff 1. A T-shaped slider 31 is horizontally slidably connected inside the fixing box 28. A second spring 29 is fixedly connected between the T-shaped slider 31 and the inner wall of the fixing box 28 away from the crossbar 26. The inner top and bottom of the fixing box 28... Each part is fixedly connected to a limiting block 30, which restricts the sliding stroke of the T-shaped slider 31, thereby limiting the rotation range of the pawl 17, so that the pawl 17 can only rotate in the unlocking direction. When the limiting block 30 contacts the T-shaped slider 31, the pawl 17 is in contact with the ratchet 12 and is locked. The end of the T-shaped slider 31 near the crossbar 26 is fixedly connected to a second rack 32, and the outer walls of the two crossbars 26 are fixedly connected to a third gear 27 that meshes with the second rack 32.

[0026] The release assembly includes a rectangular box 19 fixedly connected to the inner wall of the right side of the earcup 1. An electromagnet 20 is embedded in the inner wall of the rectangular box 19 near the fixing ring 11. A movable block 22 is horizontally slidably connected inside the rectangular box 19. The movable block 22 is made of magnetic metal and can be adapted to the magnetic attraction of the electromagnet 20. A first spring 21 is fixedly connected between the adjacent sides of the electromagnet 20 and the movable block 22. A first rack 25 is fixedly connected to the end of the movable block 22 away from the electromagnet 20. The rectangular box 19 rotates... A rotating rod 23 is connected, with both ends of the rotating rod 23 penetrating through the rectangular box 19. The rotating rod 23 is fixedly connected to the outer wall of the rectangular box 19 with a second gear 24 that meshes with the first rack 25. Both ends of the rotating rod 23 extending to the outside of the rectangular box 19 are fixedly connected to rectangular rods 18. The ends of the two rectangular rods 18 away from the rotating rod 23 are rotatably connected to connecting rods 35. The ends of the two connecting rods 35 away from the rectangular rods 18 are respectively rotatably connected to the ends of the two second racks 32 away from the T-shaped slider 31.

[0027] The output shaft of the micro motor 13 is fixedly connected to the motor shaft 14, and the first gear 15 is fixedly connected to the motor shaft 14. The micro motor 13 does not have a self-locking function, so when the spool shaft 36 rotates in the reverse direction, it will drive the shaft of the micro motor 13 to rotate. The outer wall of the spool shaft 36 is fixedly connected to the fourth gear 34, and the first gear 15 meshes with the fourth gear 34. The input shaft of the encoder is coaxially fixedly connected to the end of the spool shaft 36 away from the ratchet 12 through an elastic coupling. The elastic coupling is a micro rubber elastic coupling, which can compensate for the coaxiality deviation between the encoder input shaft and the spool shaft 36 and ensure the accuracy of angle detection.

[0028] Both the tightening switch 4 and the loosening switch 5 are electrically connected to the main control chip of the earphone. Both the tightening switch 4 and the loosening switch 5 are push-button touch switches. After being pressed, they can send corresponding electrical action commands to the main control chip. The tightening switch 4 is used to drive the output shaft of the micro motor 13 to rotate clockwise, and the loosening switch 5 is used to synchronously drive the electromagnet 20 to be energized and the output shaft of the micro motor 13 to rotate counterclockwise. After receiving the electrical signal from the switch, the main control chip can synchronously send action commands to the corresponding actuator.

[0029] The control switch assembly includes a ring 2 fixedly connected to the outer wall of the earcup 1. The inner wall of the ring 2 has two symmetrical arc-shaped grooves 37 along the circumference. A short rod 38 is rotatably connected to the outer wall of the earcup 1 and located inside the ring 2. A switching block 39 that fits against the inner wall of the ring 2 is fixedly connected to the outer wall of the short rod 38. A conductive contact is embedded inside the switching block 39. Both ends of the switching block 39 extend into the corresponding arc-shaped grooves 37. A conductive block 40 that cooperates with the conductive contact is embedded in the inner wall of each of the two arc-shaped grooves 37. The conductive block 40 is connected to the power supply circuit of the electromagnet 20. When the conductive contact contacts the conductive block 40, the power supply circuit of the electromagnet 20 is turned on. When the two are separated, the power supply circuit is turned off. A knob 3 is fixedly connected to the end of the short rod 38 away from the earcup 1.

[0030] Among them, the pressure sensor is a flexible thin film pressure sensor, which is set to fit the inner curved surface of the soundproof cover 7; the earcups 1 are also equipped with a main control chip and a power supply battery. The main control chip is electrically connected to the pressure sensor, encoder, micro motor 13, electromagnet 20, tightening switch 4, loosening switch 5 and conductive block 40 respectively.

[0031] The functional principle of this invention can be explained through the following operation: When the user wears the headphones, the elastic metal headband 6 fits the head due to its own characteristics, the soundproof cover 7 makes initial contact with the ear, and the flexible thin film pressure sensor on the inner side of the earcup 1, which is attached to the curved surface of the soundproof cover 7, detects the initial contact pressure in real time and transmits the signal to the main control chip inside the headphones. At this time, the adjustment component and the release component are in the initial state, the pawl 17 and the ratchet 12 naturally engage to realize the one-way locking of the spool shaft 36, the pull cord 10 maintains the basic tension, and the vertical plate 8 is in the initial position in the rectangular opening of the earcup 1, preparing for subsequent pressure adjustment.

[0032] When the user needs to increase the fit between the earmuff 1 and the ear to enhance the sound insulation and noise reduction effect, press the adjustment switch 4 on the outer wall of the earmuff 1. The adjustment switch 4 sends an adjustment command to the main control chip, which drives the micro motor 13 to start. Its output shaft rotates clockwise and drives the first gear 15 to rotate. Through the meshing transmission between the first gear 15 and the fourth gear 34, the spool shaft 36 is driven to rotate counterclockwise synchronously. The spool body 33 rotates with the spool shaft 36 and winds up the pull rope 10. The pull rope 10 pulls... The vertical plate 8 slides vertically downward within the rectangular opening. As the vertical plate 8 moves downward, it causes the connecting plate 9 to rotate around the hinge and pull the end of the headband 6, increasing the bending degree of the headband 6. The supporting force of the headband 6 on the earmuff 1 is increased simultaneously, thereby increasing the contact pressure between the earmuff 1 and the ear. This continues until the user releases the tensioning switch 4, and the micro motor 13 stops rotating. At the same time, the engagement structure between the pawl 17 and the ratchet 12 prevents the spool shaft 36 from rotating in the opposite direction, ensuring that the bending angle of the headband 6 is stable and the pressure on the earmuff 1 remains unchanged. During this process, the encoder rotates synchronously with the reel shaft 36 through the flexible coupling, monitors and records the rotation angle of the reel shaft 36 in real time, and transmits the angle signal to the main control chip for storage, forming the angle memory value corresponding to the current pressure.

[0033] When the user needs to reduce the pressure of the earcups 1, they press the adjustment switch 5 on the outer wall of the earcups 1. The adjustment switch 5 sends an adjustment command to the main control chip, which synchronously drives the electromagnet 20 to rotate counterclockwise with the output shaft of the micro motor 13. After the electromagnet 20 is energized, it generates a magnetic force to attract the moving block 22, which slides towards the electromagnet 20 inside the rectangular box 19. The first spring 21 is compressed, and the movement of the moving block 22 drives the first rack 25 to move synchronously. Through the meshing transmission between the first rack 25 and the second gear 24, the rotating rod 23 is driven to rotate. The rotating rod 23 drives the rectangular rods 18 at both ends to rotate synchronously. The rectangular rods 18 are pulled by the connecting rod 35. Pull the second rack 32 away from the crossbar 26. The second rack 32 meshes with the third gear 27, driving the crossbar 26 to rotate around the fixed ring 11. This causes the pawl 17 to separate from the ratchet 12, releasing the one-way lock of the spool shaft 36. At the same time, the micro motor 13 rotates counterclockwise, driving the spool shaft 36 to rotate in the opposite direction through gear meshing. The spool body 33 releases the pull rope 10. The headband 6 recovers its deformation due to the elastic restoring force of the torsion spring and its own elasticity, reducing the degree of bending. The supporting force of the headband 6 on the earmuff 1 decreases. Under the restoring pull of the headband 6, the vertical plate 8 moves vertically upward along the rectangular opening, and the contact pressure between the earmuff 1 and the ear decreases accordingly. After the user releases the adjustment switch 5, the electromagnet 20 is de-energized, the elastic restoring force of the first spring 21 pushes the moving block 22 to reset, and the linkage of each component causes the pawl 17 to re-engage with the ratchet 12, restoring the locked state of the spool shaft 36. The micro motor 13 stops rotating and self-locks, maintaining the current earmuff 1 pressure.

[0034] Users can turn the wearing protection mode on and off by rotating the knob 3 of the control switch assembly. When the knob 3 is rotated, the short rod 38 drives the switching block 39 to rotate in the arc groove 37 of the ring 2. When the conductive contact in the switching block 39 contacts the conductive block 40 on the inner wall of the arc groove 37, the power supply circuit of the electromagnet 20 is turned on, and the wearing protection mode is turned on. When the conductive contact separates from the conductive block 40, the power supply circuit of the electromagnet 20 is turned off, and the wearing protection mode is turned off. The operation is convenient and the switching state is stable.

[0035] When the wearing protection mode is activated, the main control chip continuously receives real-time pressure signals from the pressure sensor and keeps track of the time. When the contact pressure between the earcup 1 and the ear exceeds a preset threshold, or when the wearing time reaches a preset duration, the main control chip automatically triggers a loosening action, driving the electromagnet 20 to release the lock between the pawl 17 and the ratchet 12. At the same time, it controls the micro motor 13 to rotate counterclockwise to release the pull cord 10, reducing the bending degree of the headband 6 and automatically reducing the pressure on the earcup 1, thus relieving ear pressure. When the user removes the headphones and puts them back on, the main control chip detects the wearing status, retrieves the previously stored angle memory value, drives the micro motor 13 to rotate clockwise, and drives the spool shaft 36 to rotate to the memory angle through gear meshing. The encoder provides real-time angle feedback to ensure that the spool shaft 36 is accurately reset. The spool body 33 winds the pull cord 10 to the corresponding position, the headband 6 returns to the bending angle previously adjusted by the user, and the pressure on the earcup 1 returns to the preset value simultaneously. This eliminates the need for repeated adjustments by the user, significantly improving the user experience.

[0036] It is worth mentioning that the present invention achieves a reasonable arrangement of structure and coordinated function through miniaturization design, compact gear meshing transmission and encoder angle feedback, etc. Moreover, the above design, through the introduction of electric adjustment and automatic protection mechanism, not only simplifies the user's operation steps, but also improves wearing comfort. Therefore, the structural design of the present invention achieves multi-dimensional intelligent control while maintaining the simplicity of the overall appearance and the efficient use of internal space, and has good practicality and manufacturability.

[0037] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A noise-canceling headphone, characterized in that, include: Two symmetrically arranged earmuffs (1) and an arc-shaped headband (6) are provided. Soundproof covers (7) are fixedly connected to the adjacent sides of the two earmuffs (1). A rectangular opening is provided at the upper end of the side of the two earmuffs (1) that is close to each other. A vertical plate (8) is vertically slidably connected inside the two rectangular openings. A connecting plate (9) is rotatably connected to the upper end of the two vertical plates (8). The end of the two connecting plates (9) away from the vertical plate (8) is rotatably connected to the end of the headband (6) through a hinge. A torsion spring is sleeved on the hinge shaft at the position that cooperates with the headband (6). The two ends of the torsion spring are fixedly connected to the hinge shaft and the headband (6) respectively. Pressure sensors are embedded on the adjacent sides of the two earmuffs (1) and inside the soundproof cover (7). Both earmuffs (1) are provided with adjustment components. Each earmuff (1) is also provided with a release component that cooperates with the adjustment components. A micro motor (13) is fixedly installed on the right inner wall of the earmuff (1). An encoder is also fixedly installed on the left inner wall of the earmuff (1). The encoder is connected to the adjustment components in a transmission manner. The micro motor (13) meshes with the adjustment components in a transmission manner. A tightening switch (4) and a loosening switch (5) are embedded in the outer wall of the earmuff (1). The outer wall of the earmuff (1) is also provided with a control switch component for controlling the power supply of the release component.

2. The noise-canceling headphones according to claim 1, characterized in that: The adjustment assembly includes a spool shaft (36) rotatably connected to the inner left wall of the earmuff (1). A spool body (33) is fixedly connected to the outer wall of the spool shaft (36). A pull rope (10) is wound around the spool body (33). One end of the pull rope (10) away from the spool body (33) is fixedly connected to the lower end of the vertical plate (8). A ratchet (12) is fixedly connected to the outer wall of the spool shaft (36). Two fixing rods (16) are fixedly connected to the inner right wall of the earmuff (1). The ends of the two fixing rods (16) away from the earmuff (1) are jointly fixedly connected to a fixing ring (11) sleeved on the outside of the spool shaft (36). Two crossbars (26) are rotatably connected to the fixing ring (11). The end of the crossbar (26) near the ratchet (12) is fixedly connected to a pawl (17) that cooperates with the ratchet (12); the inner walls of the front and rear sides of the earmuff (1) are fixedly connected to a fixing box (28), a T-shaped slider (31) is horizontally slidably connected inside the fixing box (28), a second spring (29) is fixedly connected between the T-shaped slider (31) and the inner wall of the fixing box (28) away from the crossbar (26), a limit block (30) is fixedly connected to the inner top and inner bottom of the fixing box (28), a second rack (32) is fixedly connected to the end of the T-shaped slider (31) near the crossbar (26), and a third gear (27) that meshes with the second rack (32) is fixedly connected to the outer walls of the two crossbars (26).

3. The noise-canceling headphones according to claim 2, characterized in that: The release assembly includes a rectangular box (19) fixedly connected to the inner wall of the right side of the earmuff (1). An electromagnet (20) is embedded in the inner wall of the rectangular box (19) near the fixing ring (11). A moving block (22) is horizontally slidably connected inside the rectangular box (19). A first spring (21) is fixedly connected between the adjacent sides of the electromagnet (20) and the moving block (22). A first rack (25) is fixedly connected to the end of the moving block (22) away from the electromagnet (20). A rotating rod (23) is rotatably connected inside the rectangular box (19). 3) Both ends of the rotating rod (23) are set through the rectangular box (19). The rotating rod (23) is fixedly connected to the outer wall of the rectangular box (19) and meshes with the first rack (25). Both ends of the rotating rod (23) extending to the outside of the rectangular box (19) are fixedly connected to the rectangular rod (18). The ends of the two rectangular rods (18) away from the rotating rod (23) are rotatably connected to the connecting rod (35). The ends of the two connecting rods (35) away from the rectangular rod (18) are respectively rotatably connected to the ends of the two second racks (32) away from the T-shaped slider (31).

4. A noise-canceling headphone according to claim 2, characterized in that: The output shaft of the micro motor (13) is fixedly connected to the motor shaft (14), and a first gear (15) is fixedly connected to the motor shaft (14). A fourth gear (34) is fixedly connected to the outer wall of the spool shaft (36). The first gear (15) and the fourth gear (34) mesh with each other. The input shaft of the encoder is coaxially fixedly connected to the end of the spool shaft (36) away from the ratchet (12) through an elastic coupling.

5. A noise-canceling headphone according to claim 1, characterized in that: The tightening switch (4) and the loosening switch (5) are both electrically connected to the main control chip of the earphone. The tightening switch (4) is used to drive the output shaft of the micro motor (13) to rotate clockwise, and the loosening switch (5) is used to synchronously drive the electromagnet (20) to be energized and the output shaft of the micro motor (13) to rotate counterclockwise.

6. The noise-canceling headphones according to claim 1, characterized in that: The control switch assembly includes a ring (2) fixedly connected to the outer wall of the earcup (1). The inner wall of the ring (2) has two arc-shaped grooves (37) symmetrically opened in the circumferential direction. A short rod (38) is rotatably connected to the outer wall of the earcup (1) and located inside the ring (2). A switching block (39) that fits against the inner wall of the ring (2) is fixedly connected to the outer wall of the short rod (38). A conductive contact is embedded inside the switching block (39). Both ends of the switching block (39) extend into the corresponding arc-shaped groove (37). The inner walls of the two arc-shaped grooves (37) are each embedded with a conductive block (40) that cooperates with the conductive contact. A knob (3) is fixedly connected to the end of the short rod (38) away from the earcup (1).

7. A noise-canceling headphone according to claim 2, characterized in that: The pull rope (10) is a low elongation high strength nylon rope. A wear-resistant guide sleeve is embedded at the penetration position of the pull rope (10) and the inner wall of the earmuff (1). The headband (6) is an arc-shaped beam made of elastic metal material. The outer side of the headband (6) is wrapped with a flexible sponge protective layer.

8. A noise-canceling headphone according to claim 4, characterized in that: The pressure sensor is a flexible thin-film pressure sensor, which is fitted to the inner curved surface of the soundproof cover (7); the earmuff (1) is also equipped with a main control chip and a power supply battery. The main control chip is electrically connected to the pressure sensor, encoder, micro motor (13), electromagnet (20), tightening switch (4), loosening switch (5) and conductive block (40).

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