A composite diaphragm planar magnetic headphone

Abstract

This invention discloses a composite diaphragm planar magnetic headphone, comprising: earcups including an outer shell and a planar magnetic driver unit installed within the outer shell; a headband, which is elastic, with two earcups respectively installed at both ends of the headband; and a telescopic structure, one end of which is connected to the headband and the other end to the earcups, and the telescopic structure can adjust the relative position of the earcups and the headband; wherein, the planar magnetic driver unit includes a planar diaphragm and an upper shell and a lower shell arranged parallel to each other on both sides of the planar diaphragm, with a plurality of permanent magnets disposed on the lower side of the upper shell and a plurality of permanent magnets disposed on the upper side of the lower shell; planar coils with an "S" shaped pattern are formed on the upper and lower sides of the planar diaphragm; and recessed areas are formed on the upper and / or lower sides of the planar diaphragm. The planar diaphragm vibrates as a whole, without affecting transient and high-frequency characteristics. For low-frequency sound, the overall mass of the composite diaphragm is reduced, effectively improving low-frequency characteristics.

Description

Technical Field

[0001] This invention relates to the field of headphones, and particularly to a composite diaphragm over-ear planar magnetic headphone. Background Technology

[0002] Planar magnetic drivers are a known technology in planar magnetic headphones. Traditional planar magnetic drivers have multiple elongated permanent magnets, each with two opposite magnetic poles on its two sides. The magnets are arranged in parallel, such that the N and S poles are alternately and firmly bonded together by non-magnetic components. A coil with an "S" or "U" shaped pattern is formed on the diaphragm surface. The diaphragm is combined with the permanent magnets such that the straight portion of the coil pattern lies precisely in the central region between the parallel elongated permanent magnets.

[0003] Existing composite diaphragm planar magnetic headphones, such as Chinese patent CN103763664A, use a multi-coil series connection to form a composite structure planar magnetic speaker composite diaphragm coil. One coil is made of gold or platinum with good ductility, while the other coil is made of a metal material with relatively poor ductility. By controlling the length, area, and position and size of the overlapping part of the two coils, the sound characteristics of the speaker can be controlled, making the low and high frequency response and transients more balanced, thus achieving a good sound effect.

[0004] The drawback of this design is that, since some coils are made of metal materials with relatively poor ductility, the total mass of the composite diaphragm will inevitably increase, resulting in improved low-frequency characteristics but reduced transient and high-frequency characteristics.

[0005] Meanwhile, due to the structural characteristics of planar magnetic drivers, they are relatively large and are more commonly used in over-ear headphones. Over-ear headphones are connected by an elastic headband. When in use, the headband holds the earcups tightly against the ears. Due to the unique one-piece structure of over-ear headphones, they are less adaptable to various head shapes and ear positions, requiring a telescopic mechanism to connect the earcups and headband, and to adjust the overall size of the headphones to accommodate different head shapes and ear positions.

[0006] However, the existing telescopic structure of headphones relies on human perception to adjust the overall size of the headphones, which cannot be precisely adjusted.

[0007] Therefore, how to provide a planar magnetic headphone that can improve low-frequency characteristics and precisely adjust the enclosure size without sacrificing high-frequency characteristics has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] A composite diaphragm planar magnetic headphone, comprising:

[0010] Earmuffs, including an outer shell and a flat panel driver unit mounted inside the outer shell;

[0011] The headband is elastic, and two earmuffs are attached to each end of the headband.

[0012] The telescopic structure has one end connected to the headband and the other end connected to the earmuffs, and the telescopic structure can adjust the relative position of the earmuffs and the headband.

[0013] The planar sound unit includes a planar diaphragm and an upper shell and a lower shell arranged parallel to each other on both sides of the planar diaphragm. A number of permanent magnets are provided on the lower side of the upper shell and a number of permanent magnets are also provided on the upper side of the lower shell.

[0014] The planar diaphragm has planar coils with an "S" shaped pattern formed on its upper and lower sides;

[0015] A recessed area is formed on the upper and / or lower sides of the planar diaphragm.

[0016] Furthermore, the area of ​​the recessed region is selected to be between 2 and 6 mm. 2 The width of the recessed area is selected to be 0.5~1mm.

[0017] Furthermore, the recessed areas are positioned between adjacent planar coils, and a row of recessed areas is provided between adjacent planar coils.

[0018] Furthermore, the number of recessed areas set between adjacent planar coils is 1 to 3.

[0019] Furthermore, when both the upper and lower sides of the planar diaphragm form recessed areas, the recessed areas on the upper and lower sides cannot overlap.

[0020] Furthermore, the telescopic structure includes a headband connection and an earmuff connection, with the upper end of the earmuff connection retractably installed inside the headband connection.

[0021] A sliding block is installed inside the headband connection part. The sliding block is manually controlled to slide up and down inside the headband connection part, and the sliding block is in elastic contact with the earmuff connection part.

[0022] In the first state, the sliding block can move the earcup connecting part together; in the second state, the sliding block cannot move the earcup connecting part together.

[0023] Furthermore, a blind hole is provided on the side of the sliding block away from the push plate, and a bobble is provided in the blind hole, the size of which matches the size of the blind hole;

[0024] A spring is also provided inside the blind hole, with one end of the spring fixedly connected to a bob and the other end fixedly connected to the bottom of the blind hole;

[0025] The upper end of the earmuff connection is fixedly installed with a telescopic tongue. The telescopic tongue is a curved plate-shaped structure, and the first side of the telescopic tongue facing the sliding block is an engaging structure. Hemispherical grooves are arranged vertically and continuously on the side wall of the first side of the telescopic tongue.

[0026] Furthermore, the telescopic tongue includes a rigid region located below and an elastic region located above, with the lower end of the rigid region fixedly installed on the upper end of the earmuff connection.

[0027] The hemispherical groove is located in the rigid region of the telescopic tongue;

[0028] The telescopic tongue is provided with elastic teeth on its second side opposite to the first side, and the elastic teeth are located at the upper end of the elastic zone.

[0029] Correspondingly, a toothed groove is provided on the side of the headband connection that faces the second side of the elastic area. The elastic teeth and the toothed groove are configured such that when the telescopic tongue extends into the headband connection, the deformation force on the elastic area is less than the deformation force on the elastic area when the telescopic tongue extends outward from the headband connection.

[0030] Furthermore, the telescopic tongue is made of a metal plate;

[0031] Wherein, the width of the elastic region is less than the width of the rigid region; and / or, the thickness of the elastic region is less than the thickness of the rigid region.

[0032] Furthermore, the cross-sectional shape of the elastic tooth is triangular, and the two faces of the elastic tooth away from the elastic zone are the upper end face located above and the lower end face located below, respectively.

[0033] Among them, the angle 'a' between the upper end face and the perpendicular bisector of the triangle is greater than the angle 'b' between the lower end face and the perpendicular bisector of the triangle.

[0034] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0035] A recessed region is formed on the upper and / or lower side of the planar diaphragm. Even after the recessed region is formed on the side of the planar diaphragm, the diaphragm still vibrates as a whole, and the vibrations caused by high-frequency sounds remain almost unchanged, without affecting transient and high-frequency characteristics. However, for low-frequency sounds, by setting the recessed region, the total mass of the composite diaphragm is reduced, effectively improving low-frequency characteristics.

[0036] In the first state, the sliding block moves the earcup connector upwards, thus moving the earcup upwards to cover the outer ear. In the second state, when the lower edge of the earcup contacts the earlobe, the sliding block stops moving the earcup connector upwards, and the earcup connector automatically stops its extension and retraction, thereby achieving the automatic stop adjustment function of the telescopic structure. Therefore, when the adjustment range is exceeded, the automatic stop adjustment function of the telescopic structure not only makes the telescopic structure less prone to damage but also prevents excessive pressure on the earlobe from the lower edge of the earcup, thus avoiding user discomfort and improving the user experience.

[0037] By designing the telescopic tongue to extend into the headband connection, the elastic zone experiences less deformation force, facilitating its insertion and making upward adjustment easier and allowing for manual upward pushing of the push plate. Conversely, by designing the telescopic tongue to extend outward from the headband connection, the elastic zone experiences greater deformation force. This prevents the telescopic tongue and earcup connection from naturally extending after manual adjustment, ensuring the stability of the earcups' optimal position. Furthermore, when wearing planar magnetic headphones, the initial step of pulling the two earcups to open the headband is less likely to disrupt the previously adjusted relative position, saving the need for a subsequent adjustment step.

[0038] By setting up the coordinated operation of the sliding block, the telescopic tongue, and the toothed grooves on the headband connection, intelligent adjustment of the telescopic structure is achieved, improving the convenience of user operation. Attached Figure Description

[0039] Figure 1 This is a diagram showing the overall structure of the headphones;

[0040] Figure 2 This is a structural diagram of a flat panel speaker unit.

[0041] Figure 3 Exploded view of a flat panel sound-emitting unit;

[0042] Figure 4 This is a cross-sectional view of a flat panel speaker unit.

[0043] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0044] Figure 6 Schematic diagram of a planar diaphragm Figure 1 ;

[0045] Figure 7 Schematic diagram of a planar diaphragm Figure 2 ;

[0046] Figure 8 Diagram of the processing device for the recessed area;

[0047] Figure 9 This is a structural diagram of the cutting blade;

[0048] Figure 10 Front view of the cutting blade;

[0049] Figure 11 View of the headphone explosion;

[0050] Figure 12 for Figure 11 Enlarged view at point B in the middle;

[0051] Figure 13 This is a side view of the telescopic tongue;

[0052] Figure 14 This is a sectional view of the telescopic structure;

[0053] Figure 15 for Figure 14 Enlarged view of point C. Detailed Implementation

[0054] The following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0055] like Figure 1 As shown, this embodiment provides a composite diaphragm planar magnetic headphone, including earcups 1, headband 3, and telescopic structure 4. The earcups 1 include an outer shell and a planar magnetic driver 2 installed inside the outer shell. The headband 3 is elastic, and two earcups 1 are respectively installed at both ends of the headband 3. One end of the telescopic structure 4 is connected to the headband 3, and the other end is connected to the earcups 1. Furthermore, the telescopic structure 4 can adjust the relative position of the earcups 1 and the headband 3.

[0056] It is understood that when using the over-ear planar magnetic headphones of this embodiment, the two earcups 1 are pulled with both hands to open the headband 3, and then the earcups 1 are covered over the ears. Under the elasticity of the headband 3, the earcups 1 fit the face. Finally, the relative position of the earcups 1 and the headband 3 is adjusted by the telescopic structure 4 to adapt to different head shapes and ear positions of various users.

[0057] In this embodiment, as Figure 2-7 As shown, the planar sound-generating unit 2 includes a planar diaphragm 21 and an upper shell 22-1 and a lower shell 22-2 arranged parallel to each other on both sides of the planar diaphragm 21. It can be understood that the upper shell 22-1 and the lower shell 22-2 are plate-shaped magnetic bodies, and the upper and lower sides of the planar diaphragm 21 are arranged parallel to each other at a predetermined interval. The upper shell 22-1 and the lower shell 22-2 have the same structure and are collectively referred to as shell 22 when no distinction is needed.

[0058] A plurality of permanent magnets 23 are respectively provided on one side of the two shells 22. Specifically, in this embodiment, eight permanent magnets 23-1 are provided on the lower side of the upper shell 22-1, and eight permanent magnets 23-2 are also provided on the upper side of the lower shell 22-2.

[0059] Understandably, in combination Figure 4 Each permanent magnet 23 is a prism of the same size, and its N and S magnetization directions are orthogonal to the plate surface of the shell 22. In the two shells 22, the magnetic poles of adjacent permanent magnets 23 are oriented in opposite directions, and the permanent magnets 23-1 on the lower side of the upper shell 22-1 and the permanent magnets 23-2 on the upper side of the lower shell 22-2 are arranged with the same poles facing each other.

[0060] In other words, the odd-numbered permanent magnets of the eight permanent magnets 23-1 located on the lower side of the upper shell 22-1 all have their N poles facing the upper side of the planar diaphragm 21, while the even-numbered permanent magnets all have their S poles facing the upper side of the planar diaphragm 21.

[0061] Similarly, among the eight permanent magnets 23-2 disposed on the upper side of the lower shell 22-2, the odd-numbered permanent magnets all have their N poles facing the lower side of the planar diaphragm 21, and conversely, the even-numbered permanent magnets all have their S poles facing the lower side of the planar diaphragm 21. Furthermore, the surface of each permanent magnet 23 that faces the planar diaphragm 21 is the magnetic pole surface 24.

[0062] Therefore, the first (attached) Figure 4 (From a perspective) Permanent magnets 23-1 and 23-2 (both N poles), the second permanent magnet 23-1 and 23-2 (both S poles), the third permanent magnet 23-1 and 23-2 (both N poles), the fourth permanent magnet 23-1 and 23-2 (both S poles), the fifth permanent magnet 23-1 and 23-2 (both N poles), the sixth permanent magnet 23-1 and 23-2 (both S poles), the seventh permanent magnet 23-1 and 23-2 (both N poles), and the eighth permanent magnet 23-1 and 23-2 (both S poles) are arranged as like poles facing each other.

[0063] Furthermore, multiple sound-emitting openings 221 are provided between adjacent permanent magnets 23 on the shell 22 to emit sound waves generated by the planar diaphragm 21 to the outside. Specifically, in this embodiment, the sound-emitting openings 221 are a plurality of holes arranged in an array. It can be understood that the sound-emitting openings 221 can be provided on the upper shell 22-1 and the lower shell 22-2, or on either the upper shell 22-1 or the lower shell 22-2.

[0064] The planar diaphragm 21 is primarily a flexible resin film structure, with planar coils 25 forming an "S" shaped pattern on its upper and / or lower sides. The planar coils 25-1 on the upper side and 25-2 on the lower side overlap with the same pattern, and the direction of the driving current flow is also the same. The planar coil 25 can be a single wire or multiple wires wired in parallel to each other.

[0065] The outer periphery of the planar diaphragm 21 is held between a pair of vertically arranged frames 26, which are mounted between the upper shell 22-1 and the lower shell 22-2. It is understood that the mounting of the frames 26 and the shell 22 is configured such that the distance between the planar diaphragm 21 and the magnetic pole face 24 of the permanent magnet 23 conforms to specifications.

[0066] Existing composite diaphragm planar magnetic headphones use a multi-coil series connection to form a composite structure planar magnetic speaker composite diaphragm coil. One coil is made of gold or platinum with good ductility, while the other coil is made of a metal material with relatively poor ductility. By controlling the length, area, and position and size of the overlapping part of the two coils, the sound characteristics of the speaker can be controlled, making the low and high frequency response and transients more balanced, thus achieving a good sound effect.

[0067] The drawback of this design is that, since some coils are made of metal materials with relatively poor ductility, the total mass of the composite diaphragm will inevitably increase, resulting in improved low-frequency characteristics but reduced transient and high-frequency characteristics.

[0068] In this embodiment, a recessed region 27 is formed on the upper and / or lower sides of the planar diaphragm 21.

[0069] After the concave region 27 is formed on the side of the planar diaphragm 21, the planar diaphragm 21 still vibrates as a whole. The vibration caused by high-frequency sounds is almost unchanged and does not affect transient and high-frequency characteristics. As for low-frequency sounds, by setting the concave region 27, the total mass of the composite diaphragm is reduced, effectively improving low-frequency characteristics.

[0070] Understandably, within a reasonable range, the larger the area of ​​the recessed region 27, the smaller the total mass of the composite diaphragm, and the greater the improvement in low-frequency characteristics. However, an excessively large area of ​​the recessed region 27 will affect the integrity of the planar diaphragm 21, sacrificing transient and high-frequency characteristics.

[0071] Therefore, the area of ​​the recessed region 27 is selected to be 2~6mm. 2 The width of the recessed area 27 is selected to be 0.5~1mm.

[0072] In this embodiment, as Figure 6-7As shown, the recessed regions 27 are positioned between adjacent planar coils 25, and a row of recessed regions 27 is provided between adjacent planar coils 25. This ensures that the integrity of the planar diaphragm 21 is not affected. Preferably, the number of recessed regions 27 in a row between adjacent planar coils 25 is 1 to 3.

[0073] In this embodiment, when recessed regions 27 are formed on both the upper and lower sides of the planar diaphragm 21, the recessed regions 27 on the upper and lower sides cannot overlap, so as not to affect the integrity of the planar diaphragm 21, nor to increase the processing difficulty of the recessed regions 27. It is understood that "cannot overlap" means that they cannot overlap completely or partially.

[0074] like Figure 8-10 As shown, this embodiment provides a processing apparatus and method for a recessed area 27. The apparatus includes a resin film fixing mechanism 7 and a cutting blade 8. The cutting blade 8 includes a body 81 and a blade 82. The width of the blade 82 is the same as the width of the recessed area 27. The body 81 is thicker and protrudes from the blade 82, which improves the overall strength of the cutting blade 8 and its compatibility with the rotating shaft.

[0075] The overall outer contour of the blade body 82 is circular, and the lower end of the blade body 82 has a flat area 83, with a cutting head 84 protruding downward from one end of the flat area 83.

[0076] During processing, such as Figure 8 As shown, first, keep the flat area 83 horizontal and press it downwards, then insert the cutting head 84 into the resin film until the flat area 83 is in contact with the upper surface of the resin film; then, rotate the cutting blade 8 clockwise to process the recessed area 27.

[0077] It is understood that this embodiment only provides a preferred processing apparatus and method for the recessed region 27, and other methods are also possible. This embodiment does not limit or protect the processing apparatus and method for the recessed region 27.

[0078] In this embodiment, as Figure 1 , 11 As shown, the telescopic structure 4 includes a headband connecting part 41 and an earmuff connecting part 42, the upper end of which is telescopically installed inside the headband connecting part 41.

[0079] It is understood that the headband 3 is installed at the upper end of the headband connecting part 41, and the earmuff 1 is installed at the lower end of the earmuff connecting part 42. The relative position of the earmuff 1 and the headband 3 is adjusted by the extension and retraction of the earmuff connecting part 42.

[0080] In this embodiment, combined with the appendix Figure 12-15As shown, a sliding block 411 is installed inside the headband connecting part 41. The sliding block 411 can be manually controlled to slide up and down inside the headband connecting part 41. The sliding block 411 is in elastic contact with the earmuff connecting part 42.

[0081] In the first state, the sliding block 411 can move the earmuff connecting part 42 together; in the second state, the sliding block 411 cannot move the earmuff connecting part 42 together.

[0082] Understandably, when wearing planar magnetic headphones, one pulls on both earcups 1 to open the headband 3, then covers the ears with the earcups 1. Due to the elasticity of the headband 3, the earcups 1 fit snugly against the face. At this point, the earcups 1 are positioned relatively low, requiring adjustment upwards via the telescopic structure 4. The traditional method involves pushing the earcups 1 upwards with both hands, relying on manual adjustment to control the overall headphone fit, which lacks precision.

[0083] In this embodiment, the sliding block 411 is manually controlled to slide upward. In the first state, the sliding block 411 moves the earmuff connecting part 42 upward together, thereby moving the earmuff 1 upward to cover the outer ear. In the second state, when the lower edge of the earmuff 1 contacts the earlobe of the outer ear, the sliding block 411 can no longer move the earmuff connecting part 42 upward together, and the earmuff connecting part 42 automatically stops its telescopic movement. That is, although the sliding block 411 continues to slide upward, the pressure of the lower edge of the earmuff 1 on the earlobe no longer changes, thereby realizing the automatic stop adjustment function of the telescopic structure 4.

[0084] Therefore, when the adjustment range is exceeded (the lower edge of the earcup 1 contacts the earlobe), the automatic stop adjustment function of the telescopic structure 4 not only makes the telescopic structure 4 less prone to damage, but also avoids excessive pressure on the earlobe by the lower edge of the earcup 1, which would cause discomfort to the user, thereby improving the user experience.

[0085] In this embodiment, the headband connecting part 41 is provided with a push plate 43 connected to the sliding block 411. The sliding block 411 is moved by manually pushing the push plate 43 upward. Adaptively, the headband connecting part 41 is also provided with a limiting groove. The push plate 43 passes through the limiting groove and is connected to the sliding block 411, and the connecting part is limited by the limiting groove.

[0086] In this embodiment, a blind hole 414 is provided on the side of the sliding block 411 away from the push plate 43. A jumping bead 413 is provided in the blind hole 414. The size of the jumping bead 413 matches the size of the blind hole 414, so that the jumping bead 413 can slide in the blind hole 414.

[0087] Understandably, the blind hole 414 can fix the jumping bead 413 in the vertical direction, and the jumping bead 413 always maintains that at least part of it is located within the blind hole 414.

[0088] A spring 412 is also provided inside the blind hole 414. One end of the spring 412 is fixedly connected to the bob 413, and the other end is fixedly connected to the bottom of the blind hole 414.

[0089] The bob 413 contacts the spring 412 and the earcup connecting part 42. The bob 413 is a component that connects the sliding block 411 and the earcup connecting part 42.

[0090] Specifically, the contact method between the jumping ball 413 and the spring 412 is that their surfaces are directly connected, and the jumping ball 413 contacts the hemispherical groove 421 on the telescopic tongue 420 in the ear cup connection part 42.

[0091] In this embodiment, a telescopic tongue 420 is fixedly installed on the upper end of the earmuff connecting part 42. The telescopic tongue 420 is a curved plate-shaped structure with a certain thickness, and the first side of the telescopic tongue 420 facing the sliding block 411 is an engaging structure. The hemispherical grooves 421 are arranged vertically and continuously on the side wall of the first side of the telescopic tongue 420.

[0092] With the above settings, in the first state, the jumping bead 413 is in an extended state under the action of the spring 412, and the jumping bead 413 is in contact with the hemispherical groove 421. The sliding block 411 drives the telescopic tongue 420 and the earmuff connecting part 42 to move upward through the jumping bead 413. In the second state, the jumping bead 413 is pressed against the hemispherical groove 421. Under the action of the two pressing, the spring 412 on the top of the jumping bead 413 is elastically deformed, and the jumping bead 413 continuously enters from one hemispherical groove 421 into the adjacent hemispherical groove 421. The sliding block 411 cannot drive the telescopic tongue 420 and the earmuff connecting part 42 to move upward through the jumping bead 413, thus realizing the automatic stop adjustment function of the telescopic structure 4 and avoiding excessive pressure on the earlobe by the lower edge of the earmuff 1.

[0093] In this embodiment, the telescopic tongue 420 is divided into two regions: a rigid region 422 located below and an elastic region 423 located above. The lower end of the rigid region 422 is fixedly installed on the upper end of the earmuff connecting part 42, thereby achieving a rigid connection between the telescopic tongue 420 and the earmuff connecting part 42.

[0094] It is understood that the hemispherical groove 421 is located in the rigid area 422 of the telescopic tongue 420 so that the hemispherical groove 421 can cooperate with the jumping ball 413.

[0095] The telescopic tongue 420 has elastic teeth 424 on its second side opposite to the first side, and the elastic teeth 424 are located at the upper end of the elastic area 423. Correspondingly, a tooth groove 415 is provided in the headband connecting part 41 on the side facing the second side of the elastic area 423. The elastic teeth 424 and the tooth groove 415 are configured such that when the telescopic tongue 420 extends into the headband connecting part 41, the deformation force on the elastic area 423 is much smaller than the deformation force on the elastic area 423 when the telescopic tongue 420 extends outward from the headband connecting part 41.

[0096] Understandably, when wearing a planar magnetic headphone, pulling the two earcups 1 with both hands will open the headband 3, causing the earcups 1 to move away from the headband connection 41. After the earcups 1 cover the ears, it is often necessary to adjust the relative position of the earcups 1 and the headband 3 through the telescopic structure 4, so that the earcups 1 can be moved upward to adjust to the optimal position.

[0097] In this embodiment, when the telescopic tongue 420 extends into the headband connection part 41, the elastic area 423 experiences less deformation force, making it easier for the telescopic tongue 420 to extend into the headband connection part 41, and making upward adjustment convenient and easy to manually push the push plate 43 upward.

[0098] Furthermore, by designing the telescopic tongue 420 to extend outwards towards the headband connection 41, the elastic zone 423 experiences a large deformation force. After manually adjusting the earcups 1 to their correct position, the telescopic tongue 420 and the earcup connection 42 are less likely to extend naturally, ensuring the stability of the earcups 1 in their optimal position. Moreover, when wearing the planar magnetic headphones, the initial step of pulling the two earcups 1 with both hands to open the headband 3 is less likely to disrupt the previously adjusted relative position, saving the need for a subsequent adjustment step.

[0099] In this embodiment, the telescopic tongue 420 is made of a metal plate. In order to enable the elastic region 423 to bend and deform when subjected to a certain range of force, the width and / or thickness of the elastic region 423 is smaller than the width and / or thickness of the rigid region 422.

[0100] In this embodiment, please refer to the appendix. Figure 13 The elastic tooth 424 has a triangular cross-sectional shape, and the two surfaces of the elastic tooth 424 away from the elastic region 423 are the upper end surface 425 located above and the lower end surface 426 located below.

[0101] Among them, the angle 'a' between the upper end face 425 and the perpendicular bisector of the triangle is greater than the angle 'b' between the lower end face 426 and the perpendicular bisector of the triangle.

[0102] Therefore, the lower end face 426 is steeper than the second side of the telescopic tongue 420, and correspondingly, the shape of the tooth groove 415 matches the shape of the elastic tooth 424. It can be understood that when the telescopic tongue 420 extends into the headband connection 41, the elastic area 423 is more prone to deformation. This ensures that the deformation force on the elastic area 423 when the telescopic tongue 420 extends into the headband connection 41 is much smaller than the deformation force on the elastic area 423 when the telescopic tongue 420 extends outward from the headband connection 41.

[0103] In this embodiment, the headband connecting part 41 includes a box body 416 and a box cover 417. The upper end face of the box body 416 is fixedly installed on the lower end face of the headband 3, and the lower end face of the box body 416 has an opening for the telescopic tongue 420 to extend into. The toothed groove 415 is disposed on the inner side of the box body 416. The box cover 417 is fastened to the box body 416, and the sliding block 411 is disposed on the inner side of the box cover 417.

[0104] In summary, please refer to the appendix. Figure 14-15 The working principle of the telescopic structure 4 in this embodiment is as follows:

[0105] When the position of the earcup 1 needs to be adjusted upwards via the telescopic structure 4, the sliding block 411 is manually slid upwards. In the first state, the sliding block 411 drives the telescopic tongue 420 and the earcup connecting part 42 to move upwards via the bob 413. Since the elastic area 423 experiences less deformation force when the telescopic tongue 420 extends into the headband connecting part 41, the elastic tooth 424 can more easily enter the adjacent upper tooth groove 415 from a lower tooth groove 415, making it easier for the telescopic tongue 420 to extend into the headband connecting part 41 and adjust upwards.

[0106] In the second state, the sliding block 411 cannot drive the telescopic tongue 420 and the earmuff connection part 42 to move upward through the jumping ball 413, thus realizing the automatic stop adjustment function of the telescopic structure 4, and the elastic tooth 424 also stays in a certain tooth groove 415.

[0107] When the position of the earcups 1 does not need to be adjusted downwards via the telescopic structure 4, during the wearing of the over-ear planar magnetic headphones, when the headband 3 is opened by pulling the two earcups 1 with both hands in the first step, the elastic area 423 experiences greater deformation force when the telescopic tongue 420 extends outwards to the headband connection 41. The elastic teeth 424 do not easily enter the adjacent lower tooth groove 415 from one upper tooth groove 415, which is not conducive to the telescopic tongue 420 extending outwards from the headband connection 41 and makes it difficult to disrupt the already adjusted relative position.

[0108] When it is necessary to adjust the position of the earcup 1 downwards via the telescopic structure 4, a certain force is applied to the earcup connecting part 42, exceeding the deformation force required for the elastic tooth 424 to move from an upper tooth groove 415 into an adjacent lower tooth groove 415, so that the position of the earcup 1 can be manually adjusted downwards.

[0109] The above description provides examples of the preferred embodiments of the present invention, and any parts not described in detail are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims, and any equivalent modifications made based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A composite diaphragm planar magnetic headphone, comprising: Earmuffs, including an outer shell and a flat panel driver unit installed inside the outer shell; The headband is elastic, and two earmuffs are attached to each end of the headband. The telescopic structure has one end connected to the headband and the other end connected to the earmuffs, and the telescopic structure can adjust the relative position of the earmuffs and the headband. The planar sound unit includes a planar diaphragm and an upper shell and a lower shell arranged parallel to each other on both sides of the planar diaphragm. A number of permanent magnets are provided on the lower side of the upper shell and a number of permanent magnets are also provided on the upper side of the lower shell. The planar diaphragm has planar coils with an "S" shaped pattern formed on its upper and lower sides; The feature is that a recessed region is formed on the upper and / or lower side surfaces of the planar diaphragm; The telescopic structure includes a headband connection and an earmuff connection, with the upper end of the earmuff connection being telescopically installed inside the headband connection. A sliding block is installed inside the headband connection part. The sliding block is manually controlled to slide up and down inside the headband connection part, and the sliding block is in elastic contact with the earmuff connection part. In the first state, the sliding block can move the earcup connecting part together; in the second state, the sliding block cannot move the earcup connecting part together. The sliding block has a blind hole on the side away from the push plate, and a bob is installed in the blind hole. The size of the bob matches the size of the blind hole. A spring is also provided inside the blind hole, with one end of the spring fixedly connected to a bob and the other end fixedly connected to the bottom of the blind hole; The upper end of the earmuff connection is fixedly installed with a telescopic tongue. The telescopic tongue is a curved plate-shaped structure, and the first side of the telescopic tongue facing the sliding block is an engaging structure. Hemispherical grooves are arranged vertically and continuously on the side wall of the first side of the telescopic tongue. The telescopic tongue includes a rigid region located below and an elastic region located above, with the lower end of the rigid region fixedly installed on the upper end of the earmuff connection. The hemispherical groove is located in the rigid region of the telescopic tongue; The telescopic tongue is provided with elastic teeth on its second side opposite to the first side, and the elastic teeth are located at the upper end of the elastic zone. Correspondingly, a toothed groove is provided on the side of the headband connection that faces the second side of the elastic area. The elastic teeth and toothed groove are configured such that when the telescopic tongue extends into the headband connection, the deformation force on the elastic area is less than when the telescopic tongue extends out of the headband connection. The telescopic tongue is made of a metal plate; Wherein, the width of the elastic region is less than the width of the rigid region; and / or, the thickness of the elastic region is less than the thickness of the rigid region; The cross-sectional shape of the elastic tooth is triangular, and the two faces of the elastic tooth away from the elastic zone are the upper end face located at the top and the lower end face located at the bottom, respectively. Among them, the angle 'a' between the upper end face and the perpendicular bisector of the triangle is greater than the angle 'b' between the lower end face and the perpendicular bisector of the triangle.

2. The composite diaphragm planar magnetic headphone as described in claim 1, characterized in that: The area of ​​the recessed region is selected to be 2~6mm. 2 The width of the recessed area is selected to be 0.5~1mm.

3. The composite diaphragm planar magnetic headphone as described in claim 1, characterized in that: The recessed areas are located between adjacent planar coils, and a row of recessed areas is set between adjacent planar coils.

4. The composite diaphragm planar magnetic headphone as described in claim 3, characterized in that: The number of recessed areas set between adjacent planar coils is 1 to 3.

5. The composite diaphragm planar magnetic headphone as described in claim 1, characterized in that: When both the upper and lower sides of a planar diaphragm form recessed areas, the recessed areas on the upper and lower sides cannot overlap.

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