A frequency-divided planar diaphragm headphone

Abstract

The present invention discloses a frequency-divided planar diaphragm earphone, comprising: left and right earcups, including an outer housing and a planar sound generating unit installed inside the outer housing; a headband, which is elastic, and the left and right earcups are respectively installed at both ends of the headband; two telescopic structures, one end of one telescopic structure is connected to the headband, and the other end is connected to the left earcup, and one end of the other telescopic structure is connected to the headband, and the other end is connected to the right earcup; the planar sound generating unit includes a planar diaphragm and an upper shell and a lower shell arranged in parallel on both side surfaces of the planar diaphragm, and a plurality of permanent magnets are arranged on the lower side surface of the upper shell, and a plurality of permanent magnets are also arranged on the upper side surface of the lower shell; a planar coil in an "S" shape pattern is formed on the upper side surface of the planar diaphragm; wherein, the planar diaphragm is provided with three, and they are arranged in sequence from top to bottom; a unique planar coil is formed on the upper side surface of each planar diaphragm, and the planar coils on the three planar diaphragms are connected in series.

Description

Technical Field

[0001] The present invention relates to the field of earphones, and particularly to a frequency-divided planar diaphragm earphone. Background Art

[0002] The planar sound generating unit is a known technology in planar earphones. The traditional planar sound generating unit has a plurality of elongated permanent magnets, each permanent magnet having two opposite magnetic poles on the surfaces on both sides thereof, and the magnets are arranged in a parallel relationship such that the N poles and the S poles are alternately and firmly joined together through non-magnetic members. A coil in an "S" shape or a "return" shape pattern is formed on the surface of the diaphragm. The diaphragm is combined with the permanent magnet such that the straight portion of the coil pattern is exactly located in the central region between the parallelly arranged elongated permanent magnets.

[0003] For existing frequency-divided planar earphones, such as Chinese Patent CN103763666A, by providing a frequency-dividing circuit and arranging a plurality of sub-coils electrically connected to different output terminals of the frequency-dividing circuit on the diaphragm, the speaker diaphragm coil formed by combining the plurality of sub-coils is obtained, and each sub-coil is responsible for a different frequency respectively.

[0004] The defect of this design is that it will affect the original sound. The reason is that a frequency-dividing circuit is connected in series between the power amplifier and the diaphragm, and the sound signals of unnecessary frequencies are filtered out, which will cause a large phase shift, and finally the amplitude-frequency response of the earphone reproduction becomes not smooth enough, generating large and deep valleys or high peaks, so that there will be a large difference between the sound heard by the user and the original sound.

[0005] Meanwhile, due to the structural characteristics of the planar sound generating unit, its volume is relatively large, and it is more applied to over-ear earphones. The over-ear earphones are connected together by an elastic headband. When the over-ear earphones are in use, the ear cups are closely attached to the human ears by means of the headband. Due to the particularity of the integral structure of the over-ear earphones, their adaptability to different head shapes and ear positions of various users is poor, and a telescopic structure is required to connect the ear cups and the headband, and the overall enclosure size of the earphone is adjusted through the telescopic structure to adapt to different head shapes and ear positions.

[0006] However, for the telescopic structure of existing over-ear earphones, the positions of the left and right ear cups are adjusted as a whole. If there is a left-right offset in the clamping position of the headband on the head, since the relative distances between the two ear cups and the headband are equal, there will always be one ear cup that cannot be in the optimal position, affecting the user experience.

[0007] Therefore, how to provide a frequency-divided planar diaphragm earphone that can avoid and precisely adjust the enclosure size has become an urgent technical problem to be solved in this field. Summary of the Invention

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

[0009] A frequency-divided planar diaphragm headphone, comprising:

[0010] Left and right earcups, including an outer housing and a planar sound generating unit installed inside the outer housing;

[0011] A headband, which is elastic, and the left and right earcups are respectively installed at both ends of the headband;

[0012] Two telescopic structures, one end of one telescopic structure is connected to the headband, and the other end is connected to the left earcup, and one end of the other telescopic structure is connected to the headband, and the other end is connected to the right earcup;

[0013] The telescopic structure includes an earcup connection part and a headband connection part, and the lower end of the headband connection part is telescopically installed inside the earcup connection part;

[0014] Wherein, the left and right earcups are respectively installed on the inner sides of the two earcup connection parts, and the left and right earcups are respectively connected to the two earcup connection parts through a universal ball hinge damping connection; and, the two telescopic structures are configured to be independently adjusted;

[0015] The planar sound generating unit includes a planar diaphragm and an upper shell and a lower shell arranged in parallel on both sides of the planar diaphragm. A plurality of permanent magnets are arranged on the lower side surface of the upper shell, and a plurality of permanent magnets are also arranged on the upper side surface of the lower shell;

[0016] A planar coil with an "S" - shaped pattern is formed on the upper side surface of the planar diaphragm;

[0017] Wherein, the planar diaphragms are arranged in three, and are arranged in sequence from top to bottom;

[0018] A unique planar coil is formed on the upper side surface of each planar diaphragm, and the planar coils on the three planar diaphragms are connected in series.

[0019] Furthermore, the outer peripheral edge part of the middle planar diaphragm is clamped between a pair of upper and lower arranged first frames, and the outer peripheral edge parts of the upper and lower planar diaphragms are clamped between the first frame and the second frame, and a pair of upper and lower arranged second frames are installed between the upper shell and the lower shell.

[0020] Furthermore, an upper sound resistance plate is installed in close fit with each magnetic pole surface of the permanent magnets along the lower side surface of the upper shell, and a lower sound resistance plate is installed in close fit with each magnetic pole surface of the permanent magnets along the upper side surface of the lower shell;

[0021] And, the sound resistance plate is made of a metal sheet with a thickness of 0.1 - 0.2 mm.

[0022] Furthermore, a plurality of sound - emitting openings are formed between adjacent permanent magnets on the shell.

[0023] Further, a sliding plate is installed inside the earcup connecting part. The sliding plate can be manually controlled to slide up and down inside the earcup connecting part, and the sliding plate is in elastic contact with the headband connecting part;

[0024] Among them, in the first state, the sliding plate can drive the headband connecting part to move together, and in the second state, the sliding plate cannot drive the headband connecting part to move together.

[0025] Further, a push plate connected to the sliding plate is provided on the headband connecting part, and a limiting groove is also formed on the headband connecting part. The push plate passes through the limiting groove and is connected to the sliding plate, and the connecting part is limited by the limiting groove.

[0026] Further, a slot is provided on the side surface of the headband connecting part, and a one-way deformable body is inserted into the slot;

[0027] The top of the one-way deformable body protrudes from the side surface of the headband connecting part and abuts against the inner side wall of the earcup connecting part;

[0028] Among them, when the headband connecting part extends into the earcup connecting part, the resistance received by the one-way deformable body is much smaller than when the headband connecting part extends out of the earcup connecting part.

[0029] Further, the one-way deformable body includes a lower deformable part and an upper deformable part;

[0030] The lower side surface of the lower deformable part is an arc surface, and the upper side surface is a plane. The lower side surface of the upper deformable part is a plane, and the upper side surface is an arc surface. Moreover, the upper side surface of the lower deformable part faces the lower side surface of the upper deformable part;

[0031] Both the lower deformable part and the upper deformable part are made of elastic rubber, and a torsion spring is vulcanized inside the upper deformable part;

[0032] Among them, the first extension end of the torsion spring is perpendicular to the lower side surface of the upper deformable part, the second extension end of the torsion spring is parallel to the lower side surface of the upper deformable part, and the first extension end and the second extension end of the torsion spring have the potential energy of approaching each other.

[0033] Further, the one-way deformable body further includes:

[0034] An installation bottom plate, which is embedded in the slot, and the lower deformable part and the upper deformable part are installed on the installation bottom plate.

[0035] Further, a gap is provided between the upper side surface of the lower deformable part and the lower side surface of the upper deformable part.

[0036] After the present invention adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0037] The two telescopic structures can be adjusted independently. Even if the clamping position of the headband on the head shows a left - right offset, the relative distances between the left and right earcups and the headband can be made unequal by adjusting the two telescopic structures separately. At the same time, with both earcups installed inside the earcup connecting part and being gimbal - connected, the left and right earcups can be in the best position and angle, enhancing the user experience.

[0038] Three planar diaphragms are provided. One of the three planar diaphragms can only effectively vibrate for high - frequency sounds, another can only effectively vibrate for mid - frequency sounds, and the last one can only effectively vibrate for low - frequency sounds. The three different planar diaphragms have relatively high sensitivities to different frequencies respectively, thus achieving the effect of frequency division. The sound signal before reaching the diaphragm does not need to be processed in any way, avoiding all possible distortions.

[0039] A thin air layer is respectively formed between the upper acoustic resistance plate and the planar diaphragm and between the lower acoustic resistance plate and the planar diaphragm, so that the planar diaphragm can be braked mechanically without electromagnetic braking, optimizing the vibration characteristics of the planar diaphragm. Moreover, since the thickness of the acoustic resistance plate is thin and it is a non - magnetic body, it hardly reduces the magnetic flux applied to the planar coil. In addition, since the air chamber of the air layer is small, the cut - off frequency of the low - pass filter formed by the air chamber and the acoustic resistance can be set to a relatively high frequency, thereby preventing the attenuation in the high - frequency range.

[0040] When the lower edge of the earcup touches the earlobe part of the outer ear, the sliding plate cannot drive the headband connecting part to move downward together, and the headband connecting part automatically stops the telescopic movement. That is, although the sliding plate continues to slide downward, the pressure on the earlobe part by the lower edge of the earcup no longer changes, thereby realizing the automatic stop adjustment function of the telescopic structure. Thus, when exceeding the adjustment range, the automatic stop adjustment function of the telescopic structure not only makes the telescopic structure not easily damaged, but also avoids excessive squeezing of the earlobe by the lower edge of the earcup, preventing the user from feeling discomfort and improving the user experience.

[0041] By setting the one - way deformable body, it is convenient for the headband connecting part to extend into the earcup connecting part. The earcup is easy to adjust upward and is easy to manually push down the push plate. Moreover, when the headband connecting part extends out of the earcup connecting part, the resistance received by the one - way deformable body is large. After manually adjusting the earcup in place, the headband connecting part is not likely to extend out naturally, ensuring the stability of the best position of the earcup. And when wearing the head - mounted earphone, when pulling the two earcups with both hands to open the headband for the first step, it is not easy to damage the relative position adjusted last time, saving the steps of the next adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is the overall structure diagram of the earphone;

[0043] Figure 2 It is the overall structure diagram of the flat sound generating unit;

[0044] Figure 3 It is the cross-sectional view of the flat sound generating unit;

[0045] Figure 4 It is the exploded view;

[0046] Figure 5 It is the schematic diagram of the principle of the flat sound generating unit;

[0047] Figure 6 It is the overall structure diagram of the telescopic structure;

[0048] Figure 7 It is the cross-sectional view of the telescopic structure. For the convenience of display, the earcup connection part is hidden;

[0049] Figure 8 It is the exploded view of the telescopic structure;

[0050] Figure 9 It is Figure 8 The partial enlarged view at position A in

[0051] Figure 10 It is the schematic diagram of the unidirectional deformable body structure;

[0052] Figure 11 It is the partial cross-sectional view of the telescopic structure. Specific implementation manners

[0053] The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0054] As Figure 1 shown, this embodiment provides a frequency-divided flat diaphragm headphone, including left and right earcups 1, 5, a headband 3, and two telescopic structures 4. The left and right earcups 1, 5 include an outer housing and a flat sound generating unit 2 installed inside the outer housing; the headband 3 is elastic, and the left and right earcups 1, 5 are respectively installed at both ends of the headband 3;

[0055] One end of a telescopic structure 4 is connected to the headband 3, and the other end is connected to the left earcup 1. One end of the other telescopic structure 4 is connected to the headband 3, and the other end is connected to the right earcup 1. Moreover, the telescopic structure 4 can adjust the relative positions of the left and right earcups 1, 5 and the headband 3.

[0056] It can be understood that when the head-mounted flat earphone of this embodiment is in use, both hands pull the left and right earcups 1 and 5 to open the headband 3, and then cover the left and right earcups 1 and 5 on the ears. Under the elastic action of the headband 3, the left and right earcups 1 and 5 fit the face. Finally, the relative position of the earcup 1 and the headband 3 is adjusted through the telescopic structure 4 to adapt to the different head shapes and ear positions of various users.

[0057] In this embodiment, as Figures 2 - 5 shown, the flat sound generating unit 2 includes a planar diaphragm 21 and an upper shell 22-1 and a lower shell 22-2 disposed in parallel on both side surfaces 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 side surface and the lower side surface of the planar diaphragm 21 are disposed in parallel at a prescribed interval. The upper shell 22-1 and the lower shell 22-2 have the same structure and are collectively referred to as the shell 22 when there is no need to distinguish.

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

[0059] It can be understood that in combination with Figure 5 , each permanent magnet 23 is a prism of the same size, and the magnetization directions of its N and S are in the direction orthogonal to the plate surface of the shell 22. And, in the two shells 22, the polarities of adjacent permanent magnets 23 face in opposite directions, and the permanent magnets 23-1 on the lower side surface of the upper shell 22-1 and the permanent magnets 23-2 on the upper side surface of the lower shell 22-2 are arranged in a manner that the same poles face each other.

[0060] That is to say, among the eight permanent magnets 23-1 provided on the lower side surface of the upper shell 22-1, the odd-numbered permanent magnets all face the upper side surface of the planar diaphragm 21 with the N pole, and in contrast, the even-numbered permanent magnets all face the upper side surface of the planar diaphragm 21 with the S pole.

[0061] Similarly, among the eight permanent magnets 23-2 provided on the upper side surface of the lower shell 22-2, the odd-numbered permanent magnets all face the lower side surface of the planar diaphragm 21 with the N pole, and in contrast, the even-numbered permanent magnets all face the lower side surface of the planar diaphragm 21 with the S pole. In addition, the surface of each permanent magnet 23 facing the planar diaphragm 21 is the magnetic pole surface 24.

[0062] Thus, the first (attached Figure 3 , 5Viewpoint) The permanent magnets 23-1 and 23-2 (both N poles), the second permanent magnets 23-1 and 23-2 (both S poles), the third permanent magnets 23-1 and 23-2 (both N poles), the fourth permanent magnets 23-1 and 23-2 (both S poles), the fifth permanent magnets 23-1 and 23-2 (both N poles), the sixth permanent magnets 23-1 and 23-2 (both S poles), the seventh permanent magnets 23-1 and 23-2 (both N poles), and the eighth permanent magnets 23-1 and 23-2 (both S poles) face each other as like poles respectively.

[0063] In addition, on the shell 22, a plurality of sound-emitting openings 221 are formed between adjacent permanent magnets 23 to emit the sound waves generated by the planar diaphragm 21 to the outside. Specifically, the sound-emitting opening 221 of this embodiment is an elongated slit hole 221. It can be understood that the sound-emitting opening 221 can be provided on the upper shell 22-1 and the lower shell 22-2, or can be provided on the upper shell 22-1 or the lower shell 22-2.

[0064] The main body of the planar diaphragm 21 is a flexible resin film mechanism, and a planar coil 25 in an "S" shape pattern is formed on its upper side and / or lower side. If the upper side and the lower side both have the planar coil 25, the planar coils on the upper side and the lower side coincide 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 arranged in parallel.

[0065] In the existing frequency-dividing flat earphones, by setting a frequency-dividing circuit and arranging multiple sub-coils electrically connected to different output ends of the frequency-dividing circuit on the diaphragm respectively, the speaker diaphragm coil composed of the combination of the multiple sub-coils is formed, and each sub-coil is responsible for a different frequency respectively.

[0066] The defect of this design is that it will affect the original sound. The reason is that a frequency-dividing circuit is connected in series between the power amplifier and the diaphragm, and the sound signals of the unnecessary frequencies are filtered out, which will cause a large phase shift. As a result, the amplitude-frequency response of the final headphone playback becomes not smooth enough, generating large and deep valleys or high peaks, so that there will be a large difference between the sound heard by the user and the original sound.

[0067] In this embodiment, the planar diaphragm 21 is provided with three, which are arranged in sequence from top to bottom, namely the upper planar diaphragm 21-1, the middle planar diaphragm 21-2, and the lower planar diaphragm 21-3;

[0068] Among them, a separately different planar coil 25 is formed on the upper side of each planar diaphragm 21, and the planar coils 25 on the upper planar diaphragm 21-1, the middle planar diaphragm 21-2, and the lower planar diaphragm 21-3 are connected in series.

[0069] In the flat sound generating unit 2 of this embodiment, one of the three planar diaphragms 21 can only effectively vibrate for high-frequency sounds, another can only effectively vibrate for medium-frequency sounds, and the last one can only effectively vibrate for low-frequency sounds. The three different planar diaphragms 21 have relatively high sensitivities to different frequencies respectively, thus achieving the effect of frequency division.

[0070] In this way, the defects of the existing frequency-divided flat headphones are overcome. The sound signal before reaching the diaphragm does not need to be processed in any way, avoiding all possible distortions.

[0071] In this embodiment, the outer peripheral part of the middle planar diaphragm 21-2 is clamped between a pair of upper and lower arranged first frames 26, and the outer peripheral parts of the upper planar diaphragm 21-1 and the lower planar diaphragm 21-3 are clamped between the first frame 26 and the second frame 28. A pair of upper and lower arranged second frames 28 are installed between the upper shell 22-1 and the lower shell 22-2. It can be understood that the installation between the first frame 26, the second frame 28 and the shell 22 is configured such that the distance between the planar diaphragm 21 and the magnetic pole surface 24 of the permanent magnet 23 complies with the regulations.

[0072] In the prior art, the distance between the above-mentioned planar diaphragm 21 and the magnetic pole surface 24 of the permanent magnet 23 needs to be wider than the vibration amplitude of the planar diaphragm 21. Therefore, when electromagnetic braking is performed on the planar diaphragm 21, it is impossible to ensure sufficient magnetic flux density required for the planar diaphragm 21.

[0073] In this embodiment, an upper acoustic resistance plate 27-1 is fitted and installed along each magnetic pole surface 24 of the permanent magnet 23-1 on the lower side surface of the upper shell 22-1, and a lower acoustic resistance plate 27-2 is fitted and installed along each magnetic pole surface 24 of the permanent magnet 23-2 on the upper side surface of the lower shell 22-2. Among them, the acoustic resistance plate 27 is made of a metal sheet with a thickness of 0.1 - 0.2 mm.

[0074] Through the above settings, a thin air layer 20 is respectively formed between the upper acoustic resistance plate 27-1 and the planar diaphragm 21 and between the lower acoustic resistance plate 27-2 and the planar diaphragm 21, so that mechanical braking can be applied to the planar diaphragm 21 without electromagnetic braking, optimizing the vibration characteristics of the planar diaphragm 21. And because the acoustic resistance plate 27 is thin and non-magnetic, it hardly reduces the magnetic flux applied to the planar coil 25.

[0075] In addition, since the air chamber of the air layer 20 is small, the cut-off frequency of the low-pass filter formed by the air chamber and the acoustic resistance can be set to a relatively high frequency, thereby preventing the attenuation of the high-frequency range. That is, mechanical braking can be applied to the planar diaphragm 21 without attenuating the high-frequency range.

[0076] In this embodiment, asFigure 6 As shown, the telescopic structure 4 includes an earmuff connecting portion 41 and a headband connecting portion 42 , and the lower end of the headband connecting portion 42 can be telescopically installed in the earmuff connecting portion 41 .

[0077] It can be understood that the headband 3 is installed at the upper end of the headband connecting part 42, and the left and right earmuffs 1 and 5 are respectively installed on the two earmuff connecting parts 41, and the relative positions of the left and right earmuffs 1 and 5 and the headband 3 are adjusted by the extension and contraction of the headband connecting part 42.

[0078] The left and right earmuffs 1 and 5 are respectively installed on the inner sides of the two earmuff connecting parts 41, and the left and right earmuffs 1 and 5 are respectively connected to the two earmuff connecting parts 41 with damping via a universal ball joint 415; and the two telescopic structures 4 are configured to be independently adjusted.

[0079] In the prior art, when using the headphones, the left and right earmuffs are pulled by both hands to open the headband, and then the left and right earmuffs are covered with the ears. Under the elastic effect of the headband, the left and right earmuffs fit the face, and finally the relative positions of the two earmuffs and the headband are adjusted simultaneously through the telescopic structure.

[0080] In this way, if the clamping position of the headband on the head is offset to the left or right, since the relative distances between the two earmuffs and the headband are equal, one of the earmuffs will always not be in the optimal position, affecting the user experience.

[0081] In the headset of the present embodiment, the two telescopic structures 4 can be adjusted independently. Even if the clamping position of the headband 3 on the head is offset to the left or right, the relative distances between the left and right earmuffs 1, 5 and the headband 3 can be made different by adjusting the two telescopic structures 4 respectively. At the same time, the two earmuffs 1, 5 are installed on the inner side of the earmuff connecting part 41 and the two are universally connected, so that the left and right earmuffs 1, 5 are in the best position and angle, thereby improving the user experience.

[0082] In this embodiment, combined with the attached Figures 6 - 7 As shown, a sliding plate 411 is installed in the earmuff connecting portion 41, and the sliding plate 411 can be manually controlled to slide up and down in the earmuff connecting portion 41, and the sliding plate 411 is in elastic contact with the headband connecting portion 42;

[0083] In the first state, the sliding plate 411 can drive the headband connecting portion 42 to move together, and in the second state, the sliding plate 411 cannot drive the headband connecting portion 42 to move together.

[0084] It can be understood that when wearing the headphone, both hands pull the left and right earcups 1 and 5 to open the headband 3, and then cover the left and right earcups 1 and 5 on the ears. Under the elastic action of the headband 3, the left and right earcups 1 and 5 fit against the face. At this time, the positions of the left and right earcups 1 and 5 are relatively low, and the telescopic structure 4 is needed to adjust the position of the earcups upward. The traditional method is to push the left and right earcups 1 and 5 upward with both hands, and rely on the human feeling to adjust the relative positions of the entire left and right earcups 1 and 5, which cannot be accurately adjusted.

[0085] In this embodiment, by manually controlling, the sliding plate 411 slides downward. In the first state, the sliding plate 411 drives the headband connecting part 42 to move downward together, so as to drive the earcup to move upward relatively to wrap the outer ear. In the second state, when the lower edge of the earcup contacts the earlobe part of the outer ear, the sliding plate 411 cannot drive the headband connecting part 42 to move downward together, and the headband connecting part 42 automatically stops the telescopic movement. That is, although the sliding plate 411 continues to slide downward, the pressing force of the lower edge of the earcup on the earlobe part no longer changes, so as to realize the automatic stop adjustment function of the telescopic structure 4.

[0086] Thus, when exceeding the adjustment range (the lower edge of the earcup contacts the earlobe part), the automatic stop adjustment function of the telescopic structure 4 not only makes the telescopic structure 4 not easily damaged, but also can avoid excessive squeezing of the earlobe by the lower edge of the earcup, making the user feel uncomfortable, so as to improve the user experience.

[0087] In this embodiment, a push plate 43 connected to the sliding plate 411 is provided on the earcup connecting part 41, and the sliding plate 411 is driven to slide by manually pushing the push plate 43 downward. Adaptively, a limiting groove 44 is further opened on the earcup connecting part 41, the push plate 43 passes through the limiting groove 44 and is connected to the sliding plate 411, and the connecting part is limited by the limiting groove 44.

[0088] In this embodiment, a leaf spring 412, a ball 413 and a retaining member 414 are installed on one side end face of the sliding plate 411. The sliding plate 411 is a plate-like structure with a certain thickness. The retaining member 414 is fixedly arranged on the side wall of the sliding plate 411, and the retaining member 414 can fix the ball 413 in the vertical direction; there are multiple retaining members 414, and they are arranged vertically on the side wall of the sliding plate 411.

[0089] Specifically, there is a gap with a certain size between two adjacent retaining members 414 to form a retaining slideway, and a ball 413 is placed in the retaining slideway. Among them, the ball 413 cannot move in the vertical direction relative to the retaining member 414.

[0090] The sheet spring 412 is fixedly installed on the holder 414. As other embodiments, the fixing method of the sheet spring 412 can be that the sheet spring 412 is placed in the groove of the sliding plate 411. At this time, there is no need to provide a holder 414, and the sheet spring 412 can also be replaced by a helical spring. It can be understood that the fixing method of the sheet spring 412 can ensure that the sheet spring 412 cannot move relative to the sliding plate 411.

[0091] The ball 413 is in contact with the sheet spring 412 and the earcup connecting portion 42. The ball 413 is a component for connecting the sliding plate 411 and the earcup connecting portion 42.

[0092] Specifically, the contact mode between the ball 413 and the sheet spring 412 is that their surfaces are in direct contact, and the ball 413 is in contact with the hemispherical groove 421 of the earcup connecting portion 42.

[0093] The lower end of the headband connecting portion 42 is a plate-like structure with a certain thickness, and the side opposite to the sliding plate 411 is a meshing structure. The hemispherical grooves 421 are vertically arranged continuously on the side wall of the headband connecting portion 42.

[0094] With the above settings, in the first state, the ball 413 is in the extended state under the action of the sheet spring 412. The ball 413 fits with the hemispherical groove 421, and the sliding plate 411 drives the headband connecting portion 42 to move downward through the ball 413; in the second state, the ball 413 is squeezed with the hemispherical groove 421. Under the squeezing action of the two, the sheet spring 412 against which the ball 413 abuts is elastically deformed, and the ball 413 continuously enters another adjacent hemispherical groove 421 from one hemispherical groove 421. The sliding plate 411 cannot drive the headband connecting portion 42 to move downward through the ball 413, realizing the automatic stop adjustment function of the telescopic structure 4 and avoiding excessive squeezing of the lower edge of the earcup on the earlobe.

[0095] In this embodiment, as Figures 8 - 9 shown in FIGS. 10 and 11, a slot 422 is provided on the side surface of the headband connecting portion 42, and a one-way deformable body 45 is inserted into the slot 422. The top of the one-way deformable body 45 protrudes from the side surface of the headband connecting portion 42 and abuts against the inner side wall of the earcup connecting portion 41. When the headband connecting portion 42 extends into the earcup connecting portion 41, the resistance received by the one-way deformable body 45 is much smaller than when the headband connecting portion 42 extends out of the earcup connecting portion 41.

[0096] It can be understood that when wearing the headphone, both hands pull the left and right ear cups 1 and 5 to open the headband 3. At this time, it will cause the left and right ear cups 1 and 5 to move away from the headband connection part 42. After the ear cups cover the ears, it is often necessary to adjust the relative position between the ear cups and the headband 3 through the telescopic structure 4 to move the ear cups upward to adjust to the best position.

[0097] In this embodiment, when the headband connection part 42 extends into the ear cup connection part 41, the resistance received by the one-way deformation body 45 is smaller, which is convenient for the headband connection part 42 to extend into the ear cup connection part 41. The ear cup is convenient to adjust upward and is easy to manually push down the push plate 43.

[0098] Moreover, by setting that when the headband connection part 42 extends out of the ear cup connection part 41, the resistance received by the one-way deformation body 45 is large. After manually adjusting the ear cup in place, the headband connection part 42 is not easy to extend out naturally, which can ensure the stability of the best position of the ear cup. And when wearing the headphone, when both hands pull the two ear cups to open the headband 3 in the first step, it is not easy to damage the relative position adjusted last time, saving the steps of the next adjustment.

[0099] In this embodiment, referring to the attached Figure 10 As shown, the one-way deformation body 45 includes a mounting base plate 451, the mounting base plate 451 is embedded in the slot 422, a lower deformation part 452 is arranged on the mounting base plate 451, the lower side surface of the lower deformation part 452 is an arc surface, and the upper side surface is a plane.

[0100] An upper deformation part 453 located above the lower deformation part 452 is further arranged on the mounting base plate 451. The lower side surface of the upper deformation part 453 is a plane, and the upper side surface is an arc surface. The upper side surface of the lower deformation part 452 faces the lower side surface of the upper deformation part 453.

[0101] In this embodiment, both the lower deformation part 452 and the upper deformation part 453 are made of elastic rubber, and a torsion spring 454 is vulcanized in the upper deformation part 453;

[0102] Wherein, the first extension end 455 of the torsion spring 454 is parallel to the mounting surface of the mounting base plate 451, the second extension end 456 of the torsion spring 454 is parallel to the lower side surface of the upper deformation part 453, and the first extension end 455 and the second extension end 456 of the torsion spring 454 have the potential energy of approaching each other.

[0103] With the above settings, when the headband connecting portion 42 extends into the earcup connecting portion 41, the upper deformation portion 453 is deformed to incline upward, and the lower deformation portion 452 is also deformed to incline upward. Since the first extension end 455 and the second extension end 456 have the potential energy to approach each other, it is easy for the upper deformation portion 453 to deform upward. The inner side wall of the earcup connecting portion 41 is basically only subjected to the frictional force of the one-way deformable body 45, and the headband connecting portion 42 can extend into the earcup connecting portion 41 relatively easily.

[0104] When the headband connecting portion 42 extends out of the earcup connecting portion 41, the upper deformation portion 453 is deformed to incline downward, and the lower deformation portion 452 is also deformed to incline downward. Since the first extension end 455 and the second extension end 456 have the potential energy to approach each other, it is relatively difficult for the upper deformation portion 453 to deform downward. The upper deformation portion 453 still has the tendency to protrude from the side surface of the headband connecting portion 42. The inner side wall of the earcup connecting portion 41 bears the extrusion force of the one-way deformable body 45, and it is difficult for the headband connecting portion 42 to extend out of the earcup connecting portion 41.

[0105] In this embodiment, a gap 457 is provided between the upper side surface of the lower deformation portion 452 and the lower side surface of the upper deformation portion 453, facilitating the deformation and inclination of the lower deformation portion 452 and the upper deformation portion 453.

[0106] The above are examples of the best implementation modes of the present invention, and the parts not described in detail are all common general knowledge of those skilled in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present invention is also within the protection scope of the present invention.

Claims

1. A frequency-divided planar diaphragm headphone, comprising: Left and right ear cups, including an outer housing and a planar sound generating unit installed inside the outer housing; A headband, which is elastic, and the left and right ear cups are respectively installed at both ends of the headband; Two telescopic structures, one end of one telescopic structure is connected to the headband, and the other end is connected to the left ear cup, and one end of the other telescopic structure is connected to the headband, and the other end is connected to the right ear cup; Characterized in that: the telescopic structure includes an ear cup connection part and a headband connection part, and the lower end of the headband connection part is telescopically installed inside the ear cup connection part; Wherein, the left and right ear cups are respectively installed on the inner sides of the two ear cup connection parts, and the left and right ear cups are respectively connected to the two ear cup connection parts through a universal ball hinge damping connection; and, the two telescopic structures are configured to be independently adjusted; The planar sound generating unit includes a planar diaphragm and an upper housing and a lower housing arranged in parallel on both sides of the planar diaphragm. A plurality of permanent magnets are arranged on the lower side surface of the upper housing, and a plurality of permanent magnets are also arranged on the upper side surface of the lower housing; A planar coil in an "S" shape pattern is formed on the upper side surface of the planar diaphragm; Wherein, the planar diaphragm is provided with three, and they are arranged in sequence from top to bottom; A unique planar coil is formed on the upper side surface of each planar diaphragm, and the planar coils on the three planar diaphragms are connected in series; A sliding plate is installed inside the ear cup connection part, and the sliding plate can be manually controlled to slide up and down inside the ear cup connection part, and the sliding plate is in elastic contact with the headband connection part; Wherein, in the first state, the sliding plate can drive the headband connection part to move together, and in the second state, the sliding plate cannot drive the headband connection part to move together; A leaf spring, a ball and a retaining member are installed on one side end surface of the sliding plate, the retaining member is fixedly arranged on the side wall of the sliding plate, and the retaining member can fix the ball in the vertical direction; the retaining members are multiple and are arranged vertically on the side wall of the sliding plate; There is a gap of a certain size between two adjacent retaining members to form a retaining slideway, and a ball is placed in the retaining slideway. Among them, the ball cannot move in the vertical direction relative to the retaining member; The leaf spring is fixedly installed on the retaining member; The ball is in direct contact with the surface of the leaf spring, and the ball is in contact with the hemispherical groove of the ear cup connection part; The lower end of the headband connection part is a plate-like structure with a certain thickness, and the side opposite to the sliding plate is a meshing structure, and the hemispherical grooves are arranged vertically and continuously on the side wall of the headband connection part; A slot is arranged on the side surface of the headband connection part, and a one-way deformable body is inserted into the slot; The top of the one-way deformable body protrudes from the side surface of the headband connection part and abuts against the inner side wall of the ear cup connection part; Wherein, when the headband connection part extends into the ear cup connection part, the resistance received by the one-way deformable body is much smaller than when the headband connection part extends out of the ear cup connection part; The one-way deformable body includes a lower deformable part and an upper deformable part; The lower side surface of the lower deformable part is an arc surface, the upper side surface is a plane, the lower side surface of the upper deformable part is a plane, the upper side surface is an arc surface, and the upper side surface of the lower deformable part is opposite to the lower side surface of the upper deformable part; Both the lower deformation part and the upper deformation part are made of elastic rubber, and a torsion spring is vulcanized and formed inside the upper deformation part; Among them, the first extension end of the torsion spring is perpendicular to the lower side surface of the upper deformation part, the second extension end of the torsion spring is parallel to the lower side surface of the upper deformation part, and the first extension end and the second extension end of the torsion spring have a potential energy of approaching each other.

2. The frequency-dividing flat diaphragm earphone according to claim 1, wherein: The outer peripheral edge part of the middle planar diaphragm is clamped between a pair of upper and lower arranged first frames, and the outer peripheral edge parts of the upper planar diaphragm and the lower planar diaphragm are clamped between the first frame and the second frame, and a pair of upper and lower arranged second frames are installed between the upper shell and the lower shell.

3. The frequency-dividing planar diaphragm earphone according to claim 1, wherein: An upper acoustic resistance plate is fitted and installed along each magnetic pole surface of the permanent magnet on the lower side surface of the upper shell, and a lower acoustic resistance plate is fitted and installed along each magnetic pole surface of the permanent magnet on the upper side surface of the lower shell; Moreover, the acoustic resistance plate is made of a metal sheet with a thickness of 0.1 - 0.2 mm.

4. The frequency-dividing planar diaphragm earphone according to claim 1, wherein: On the shell, a plurality of sound emitting openings are provided between adjacent permanent magnets.

5. The frequency-dividing planar diaphragm earphone according to claim 1, wherein: A push plate connected to the sliding plate is arranged on the earphone cup connecting part, and a limiting groove is also provided on the earphone cup connecting part. The push plate passes through the limiting groove and is connected to the sliding plate, and the connecting part is limited by the limiting groove.

6. The frequency-dividing planar diaphragm earphone according to claim 1, wherein: The one-way deformable body further includes: A mounting base plate, which is embedded in the slot, and the lower deformation part and the upper deformation part are mounted on the mounting base plate.

7. The frequency-dividing flat diaphragm earphone according to claim 1, characterized in that: A gap is provided between the upper side surface of the lower deformation part and the lower side surface of the upper deformation part.

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