Portable Bluetooth earphone with telescopic head beam

Abstract

The utility model discloses a portable Bluetooth earphone with a telescopic head beam. The portable Bluetooth earphone comprises a left loudspeaking part, a right loudspeaking part, an upper head beam part and a lower head beam part, two ends of the upper head beam part are respectively connected with the left loudspeaking part and the right loudspeaking part, and two ends of the lower head beam part are respectively connected with the left loudspeaking part and the right loudspeaking part; the upper head beam part is positioned above the lower head beam part; the lower head beam part comprises an extension flexible piece and a protection cushion layer; the extension flexible part is in a strip shape, the two ends of the extension flexible part are connected with the left loudspeaking part and the right loudspeaking part respectively, the periphery of the extension flexible part is wrapped with the protection cushion layer, and the extension flexible part can be stretched and shortened according to the tensile force. The pressure of the headphone from top to bottom can be uniformly distributed on the upper half part of the whole head, and the pressure cannot be concentrated on the top of the head; in addition, when the head of the user is large, discomfort caused by too large clamping force is relieved.

Description

Technical Field

[0001] This utility model relates to audio equipment, specifically to a portable Bluetooth headset with a retractable headband. Background Technology

[0002] Over-ear headphones are a common type of headphone. They consist of two parts: a signal transmitter and headphones (usually dynamic) with signal receiving and amplification devices. The transmitter is connected to the signal source, and a preamp or headphone amplifier can be connected in front of the transmitter to improve sound quality and adjust timbre.

[0003] Existing headphone headbands are mostly made of rigid strips, relying on their own bending and elastic deformation to create clamping force from the left and right sides towards the head. Due to differences in head size and shape, the same existing headphone headband may be too tight for users with smaller heads, causing excessive pressure and discomfort; conversely, it may be too loose for users with smaller heads, causing pressure to concentrate on the top of the head and resulting in discomfort. In other words, existing headphone headband structures lack the ability to adjust the lateral clamping force and downward pressure based on different user head sizes, resulting in insufficient versatility.

[0004] Therefore, there is a need for a type of headset that can adjust the clamping force and downward pressure distribution according to different users' head sizes. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a headset that can adjust the clamping force and downward pressure distribution according to different users' head sizes.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A portable Bluetooth headset with a retractable headband includes a left speaker, a right speaker, an upper headband, and a lower headband. The upper headband is connected to the left and right speakers at both ends, and the lower headband is also connected to the left and right speakers at both ends. The upper headband is located above the lower headband. The lower headband includes a flexible extension member and a protective padding layer. The flexible extension member is strip-shaped, with both ends connected to the left and right speakers. The protective padding layer surrounds the flexible extension member, which can extend or shorten according to the magnitude of the tensile force.

[0008] Specifically, the flexible component can be made of rubber bands, elastic bands, elastic ropes, or other flexible materials that can stretch accordingly when both ends are stretched.

[0009] By adopting the above technical solution, the headband of the headphones is composed of an upper headband and a lower headband. The lower headband, which is located at the bottom and in direct contact with the user's head, is connected to the left and right speakers at both ends, respectively. The middle part is provided with an extendable flexible member that can stretch and shorten according to the magnitude of the tensile force. This makes the lower headband form an inverted U-shape when the user wears the headphones, and the extendable flexible member fits the upper part of the user's head, which can evenly distribute the pressure of the headphones from top to bottom across the entire upper part of the head, rather than concentrating the pressure on the top of the head. In addition, when the user's head is large, because the extendable flexible member can stretch evenly when stretched, the horizontal distance between the left and right speakers increases, and the clamping force on the head on both sides is reduced accordingly, alleviating the discomfort caused by excessive clamping force.

[0010] As an improvement, the protective padding layer includes an upper padding layer disposed above the stretchable flexible member and a lower padding layer disposed below the stretchable flexible member; one side of the upper padding layer is connected to the lower padding layer in a hinge-like manner; the other side of the upper padding layer is detachably connected to the other side of the lower padding layer by mutually cooperating Velcro.

[0011] By adopting the above technical solution, the protective padding layer clamps the flexible component from top and bottom, and is detachably connected using Velcro at the front or rear. This allows for quick installation and removal of the protective padding layer. When the protective padding layer becomes dirty, it can be quickly removed for cleaning, and when it wears out, it can be quickly removed and replaced. This provides continuous outer protection for the easily worn flexible component, preventing critical components from becoming dirty or damaged. Even if the flexible component is damaged, the protective padding layer can be quickly removed for replacement with a new one.

[0012] As an improvement, the lower head beam also includes a rigid left connector and a right connector. The two ends of the extended flexible member are fixedly / rotatably connected to the left connector and the right connector, respectively. The protective pad layer cooperates with the left connector and the right connector to surround the extended flexible member. The left connector is connected to the left speaker, and the right connector is connected to the right speaker.

[0013] More preferably, the length of the protective pad is greater than the length of the flexible member in its maximum stretched state, and the middle part of the flexible member is fixed to the middle part of the inner side of the protective pad, so that even when the flexible member is in its maximum stretched state, the protective pad, the left connector, and the right connector still completely surround the flexible member.

[0014] By adopting the above technical solution, the flexible component is completely encased within the protective padding layer in its unstretched state. Furthermore, the flexible component remains completely encased within the protective padding layer in all states, connected to the left and right speaker units only through relatively strong, non-stretchable, and non-retractable left and right connectors. This maximizes the protection of the flexible component, preventing it from being exposed and scratched by external hard objects.

[0015] As an improvement, the upper beam includes a central member located in the middle, a left sleeve rod movably sleeved on the left end of the central member, and a right sleeve rod movably sleeved on the right end of the central member; the left sleeve rod is connected to the left speaker, and the right sleeve rod is connected to the right speaker.

[0016] By adopting the above technical solution, the overall length of the upper beam can be reduced by moving the left and right sleeves towards the middle of the middle member, or by moving the left and right sleeves towards both ends of the middle member.

[0017] As an improvement, flexible resistance rings are provided between the middle rod and the left sleeve rod, and between the middle rod and the right sleeve rod. The thickness of the flexible resistance ring is not less than the gap between the middle rod and the left sleeve rod, nor less than the gap between the middle rod and the right sleeve rod.

[0018] Specifically, the flexible resistance ring presses tightly against the side walls of the middle rod and the left sleeve on both sides, creating friction between them and keeping them relatively stationary without significant external force. The same principle applies between the middle rod and the right sleeve.

[0019] The flexible resistance ring is made of an elastic material, such as rubber, that can compress its volume within a certain range.

[0020] By adopting the above technical solution, the left and right sleeve rods can remain relatively stationary with the middle rod when no external force is applied, preventing the upper beam from unexpectedly changing its length.

[0021] As an improvement, the end of the middle rod and the end of the left sleeve rod are provided with matching limiting protrusions; the end of the middle rod and the end of the right sleeve rod are provided with matching limiting protrusions.

[0022] Specifically, the middle rod has a rod limiting protrusion at the end corresponding to the left sleeve rod, and the rod limiting protrusion faces and abuts against the left sleeve rod; the left sleeve rod has a left limiting protrusion at its end, and the left limiting protrusion faces and abuts against the middle rod; when the left sleeve rod moves to a position where it is about to detach from the middle rod, the rod limiting protrusion blocks the movement path of the left limiting protrusion, preventing the left sleeve rod from detaching from the middle rod;

[0023] The middle rod has a rod limiting protrusion at its end corresponding to the right sleeve rod, and the rod limiting protrusion faces and abuts against the right sleeve rod; the right sleeve rod has a right limiting protrusion at its end, and the right limiting protrusion faces and abuts against the middle rod; when the right sleeve rod moves to a position where it is about to detach from the middle rod, the rod limiting protrusion blocks the movement path of the right limiting protrusion, preventing the right sleeve rod from detaching from the middle rod.

[0024] Preferably, a flexible resistance ring can be sleeved between the rod limiting protrusion and the left / right limiting protrusion to provide a buffering effect, prevent the rod limiting protrusion from directly colliding with the left / right limiting protrusion, and improve service life.

[0025] By adopting the above technical solution, these limiting protrusions can prevent the left / right sleeve rod from moving outward excessively and thus detaching from the middle rod, which would lead to the breakage of the upper beam.

[0026] As an improvement, the left sleeve rod and the right sleeve rod are provided with sliding grooves, and the two ends of the lower head beam are movably mounted on the sliding grooves.

[0027] Specifically, taking the left sleeve rod and the left connecting piece of the lower head beam as an example, a sliding groove is provided on the left sleeve rod, and a limit terminal is provided on the left connecting piece. The limit terminal is slidably disposed in the sliding groove, so that the left end of the lower head beam is slidably disposed on the sliding groove of the left sleeve rod. The principle of the right sleeve rod and the right connecting piece is the same, and will not be explained again.

[0028] By adopting the above technical solution, the lower headband surrounds the upper part of the user's head, and the extended flexible part of the lower headband continuously provides a force in the direction of contraction, causing the left and right sleeve rods to tend to contract and move towards the middle of the central rod, so that the headphones tend to shrink in size when not worn, reducing the space required for storage.

[0029] As an improvement, a chin strap is also included, with its two ends connected to the left and right vocal tractors, respectively.

[0030] The chin strap can be worn using existing technologies such as buckles, clasps, and snaps, and its length can be adjusted using D-rings or other existing technologies.

[0031] By adopting the above technical solution, the chin strap surrounds the user's head from below, and the lower headband surrounds the upper part of the user's head, so that the pressure of the headphones on the head is evenly distributed, while also increasing the stability of the headphones, making them less likely to come loose or fall off even when running or jumping vigorously.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] The headband of the headphones consists of an upper headband and a lower headband. The lower headband, located at the bottom and in direct contact with the user's head, is connected to the left and right speakers at both ends. The middle section has a flexible extension member that can extend and retract according to the amount of tension. This makes the lower headband form an inverted U-shape when the user wears the headphones, and the flexible extension member fits the upper part of the user's head, which can evenly distribute the pressure of the headphones from top to bottom across the entire upper part of the head, rather than concentrating the pressure on the top of the head. In addition, when the user's head is large, because the flexible extension member can extend evenly when stretched, the horizontal distance between the left and right speakers increases, and the clamping force on the head on both sides is reduced accordingly, alleviating the discomfort caused by excessive clamping force. Attached Figure Description

[0034] Figure 1 This is a simplified overall structural cross-sectional view of a portable Bluetooth headset with a retractable headband according to this utility model.

[0035] Figure 2 This is a detailed overall structural cross-sectional view of a portable Bluetooth headset with a retractable headband according to this utility model.

[0036] Figure 3 This is a cross-sectional view of the lower headband of a portable Bluetooth headset with a retractable headband according to this utility model.

[0037] Figure 4 This is a cross-sectional view of the lower headband of a portable Bluetooth headset with a retractable headband, near the Velcro area, according to this utility model.

[0038] Figure 5 This is a cross-sectional view of the connection structure between the middle rod and the left sleeve rod of a portable Bluetooth headset with a retractable headband according to this utility model.

[0039] Figure 6 This is a partial cross-sectional view of the sliding groove connection between the left connector and the left sleeve area of ​​the portable Bluetooth headset with a retractable headband according to this utility model.

[0040] Among them, 1: left speaker; 2: right speaker; 3: upper head beam; 31: middle rod; 32: left sleeve rod; 33: right sleeve rod; 34: flexible resistance ring; 35: rod limiting protrusion; 36: left limiting protrusion; 37: groove; 4: lower head beam; 41: extended flexible part; 42: protective pad; 421: upper pad; 422: lower pad; 43: Velcro; 431: wool layer; 432: barbed hook layer; 44: left connector; 45: right connector; 46: limiting terminal; 5: chin strap. Detailed Implementation

[0041] The present invention will now be further described in conjunction with the accompanying drawings and embodiments:

[0042] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0043] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used for descriptive purposes and to distinguish similar objects only; there is no order between them, nor should they be construed as indicating or implying relative importance. Additionally, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0046] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0047] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0048] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0049] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0050] Implementation Case 1:

[0051] As attached Figure 1-6 As shown, a portable Bluetooth headset with a retractable headband includes a left speaker 1, a right speaker 2, an upper headband 3, and a lower headband 4. The upper headband 3 is connected to the left speaker 1 and the right speaker 2 at both ends, and the lower headband 4 is connected to the left speaker 1 and the right speaker 2 at both ends, respectively. The upper headband 3 is located above the lower headband 4. The lower headband 4 includes an extendable flexible member 41 and a protective padding layer 42. The extendable flexible member 41 is strip-shaped, with both ends connected to the left speaker 1 and the right speaker 2, respectively. The protective padding layer 42 wraps around the extendable flexible member 41, and the extendable flexible member 41 can extend or shorten according to the magnitude of the tensile force.

[0052] Specifically, the flexible member 41 can be made of rubber bands, elastic bands, elastic ropes, or other flexible materials that can stretch accordingly when both ends are stretched.

[0053] The headband of the headphones consists of an upper headband 3 and a lower headband 4. The lower headband 4, which is located at the bottom and in direct contact with the user's head, is connected to the left speaker 1 and the right speaker 2 at both ends. The middle part is provided with an extendable flexible member 41 that can stretch and shorten according to the amount of tension. This makes the lower headband 4 form an inverted U-shape when the user wears the headphones, and the extendable flexible member 41 fits the upper part of the user's head, which can evenly distribute the pressure of the headphones from top to bottom across the entire upper part of the head, instead of concentrating the pressure on the top of the head. In addition, when the user's head is large, because the extendable flexible member 41 can stretch evenly when stretched, the horizontal distance between the left speaker 1 and the right speaker 2 increases, and the clamping force on the head on both sides is reduced accordingly, alleviating the discomfort caused by excessive clamping force.

[0054] The protective padding layer 42 includes an upper padding layer 421 disposed above the stretchable flexible member 41, and a lower padding layer 422 disposed below the stretchable flexible member 41; one side of the upper padding layer 421 is connected to the lower padding layer 422 in a hinge-like manner; the other side of the upper padding layer 421 is detachably connected to the other side of the lower padding layer 422 by mutually cooperating Velcro 43.

[0055] like Figure 4 As shown, the lower right end of the upper padding layer 421 is provided with a yarn layer 431 of Velcro 43, and the upper right end of the lower padding layer 422 is provided with a hook layer 432 of Velcro 43. The hook layer 432 can contact and hook the yarn layer 431 upwards, so that the upper padding layer 421 and the lower padding layer 422 are closed and fixedly connected at the right end.

[0056] The protective padding layer 42 clamps the flexible element 41 from above and below, and is detachably connected at the front or rear using Velcro 43. This allows for quick installation and removal of the protective padding layer 42. When the protective padding layer 42 becomes dirty, it can be quickly removed for cleaning, and when it becomes worn, it can be quickly removed and replaced. This provides continuous outer protection for the wear-prone flexible element 41, preventing it from becoming dirty or damaged. Even if the flexible element 41 is damaged, the protective padding layer 42 can be quickly removed for replacement with a new flexible element 41.

[0057] The lower head beam also includes a rigid left connector 44 and a right connector 45. The two ends of the extended flexible member 41 are fixedly / rotatably connected to the left connector 44 and the right connector 45, respectively. The protective pad 42 cooperates with the left connector 44 and the right connector 45 to surround the extended flexible member 41. The left connector 44 is connected to the left speaker 1, and the right connector 45 is connected to the right speaker 2.

[0058] The length of the protective pad 42 is greater than the length of the extended flexible member 41 in its maximum stretched state, and the middle part of the extended flexible member 41 is fixed to the middle part of the inner side of the protective pad 42, so that even when the extended flexible member 41 is in its maximum stretched state, the protective pad 42, the left connector 44 and the right connector 45 still completely surround the extended flexible member 41.

[0059] The flexible extension element 41 is completely encased within the protective padding layer 42 in its unstretched state. Furthermore, the flexible extension element 41 is always completely encased within the protective padding layer 42, and is connected to the left speaker 1 and the right speaker 2 only through the relatively rigid and non-stretchable left connector 44 and right connector 45. This maximizes the protection of the flexible extension element 41, preventing it from being exposed and scratched by external hard objects.

[0060] The upper beam 3 includes a central rod 31 located in the middle, a left sleeve rod 32 movably sleeved on the left end of the central rod 31, and a right sleeve rod 33 movably sleeved on the right end of the central rod 31; the left sleeve rod 32 is connected to the left speaker 1, and the right sleeve rod 33 is connected to the right speaker 2.

[0061] The upper beam 3 can reduce its overall length by moving the left sleeve rod 32 and the right sleeve rod 33 toward the middle of the middle member 31, or increase its overall length by moving the left sleeve rod 32 and the right sleeve rod 33 toward both ends of the middle member 31.

[0062] Flexible resistance rings 34 are provided between the middle rod 31 and the left sleeve rod 32, and between the middle rod 31 and the right sleeve rod 33. The thickness of the flexible resistance ring 34 is not less than the gap between the middle rod 31 and the left sleeve rod 32, nor less than the gap between the middle rod 31 and the right sleeve rod 33.

[0063] In this embodiment, the flexible resistance ring 34 is a rubber ring made of rubber. Taking the fit between the middle rod 31 and the left sleeve rod 32 as an example, as shown in the attached figure... Figure 5 As shown, a rubber ring (i.e., a flexible resistance ring 34) is fitted onto the outer surface of the central rod 31. A left sleeve rod 32 is fitted over the rubber ring and the central rod 31. The central rod 31 and the left sleeve rod 32 compress the rubber ring. Due to the compression, the rubber ring shrinks in volume or deforms, thereby generating friction between the central rod 31 and the left sleeve rod 32. The principle between the central rod 31 and the right sleeve rod 33 is the same and will not be described again.

[0064] The flexible resistance ring 34 presses tightly against the side walls of the middle rod 31 and the left sleeve rod 32 on both sides, generating friction between the middle rod 31 and the left sleeve rod 32, so that the middle rod 31 and the left sleeve rod 32 remain relatively stationary without significant external force. The same principle applies between the middle rod 31 and the right sleeve rod 33.

[0065] The left sleeve 32 and the right sleeve 33 can remain relatively stationary with the middle member 31 when no external force is applied, preventing the upper beam 3 from accidentally changing its length.

[0066] The middle rod 31 and the left sleeve rod 32 are provided with matching limiting protrusions 35; the middle rod 31 and the right sleeve rod 33 are provided with matching limiting protrusions 35.

[0067] These limiting protrusions 35 can prevent the left sleeve rod 32 / right sleeve rod 33 from moving outward excessively and thus detaching from the middle rod 31, thereby causing the upper beam 3 to break.

[0068] As attached Figure 5 As shown, the middle rod 31 has a rod limiting protrusion 35 at its end corresponding to the left sleeve rod 32. The rod limiting protrusion 35 faces and abuts against the left sleeve rod 32. The left sleeve rod 32 has a left limiting protrusion 36 at its end. The left limiting protrusion 36 faces and abuts against the middle rod 31. When the left sleeve rod 32 moves to a position where it is about to detach from the middle rod 31, the rod limiting protrusion 35 blocks the movement path of the left limiting protrusion 36, preventing the left sleeve rod 32 from detaching from the middle rod 31. Here, a flexible resistance ring 34 is sleeved between the rod limiting protrusion 35 and the left limiting protrusion 36 to provide a buffering effect, preventing direct collision between the rod limiting protrusion 35 and the left limiting protrusion 36 and improving service life.

[0069] The left sleeve rod 32 and the right sleeve rod 33 are provided with sliding grooves, and the two ends of the lower head beam 4 are movably mounted on the sliding grooves.

[0070] As attached Figure 6 As shown, taking the left sleeve rod 32 and the left connecting piece 44 of the lower head beam 4 as an example, the left sleeve rod 32 is provided with a sliding groove 37, and the left connecting piece 44 is provided with a limiting terminal 46. The limiting terminal 46 is slidably disposed in the sliding groove 37, so that the left end of the lower head beam 4 is slidably disposed on the sliding groove 37 of the left sleeve rod 32. The principle of the right sleeve rod 33 and the right connecting piece 45 is the same, and will not be described again.

[0071] The lower headband 4 surrounds the upper part of the user's head, and the extended flexible member 41 of the lower headband 4 continuously provides a force in the direction of contraction, causing the left sleeve 32 and the right sleeve 33 to tend to contract and move towards the middle of the central member 31, so that the headphones tend to shrink in size when not worn, reducing the space required for storage.

[0072] It also includes a mandibular band, the two ends of which are connected to the left speaker 1 and the right speaker 2, respectively.

[0073] The chin strap 5 can be worn using existing technologies such as buckles, clasps, and snaps, and its length can be adjusted using D-rings or other existing technologies.

[0074] The chin strap wraps around the user's head from below, and the lower headband wraps around the upper part of the user's head, which not only distributes the pressure on the head evenly, but also increases the stability of the headphones, making them less likely to come loose or fall off even during vigorous running and jumping.

[0075] In summary, after reading this utility model document, those skilled in the art can make various other corresponding modifications based on the technical solution and concept of this utility model without creative mental effort. Different application scenarios are all within the scope of protection of this utility model.

Claims

1. A portable Bluetooth headset with a retractable headband, characterized in that, It includes a left speaker (1), a right speaker (2), an upper head beam (3), and a lower head beam (4); the two ends of the upper head beam (3) are connected to the left speaker (1) and the right speaker (2) respectively, and the two ends of the lower head beam (4) are connected to the left speaker (1) and the right speaker (2) respectively; the upper head beam (3) is located above the lower head beam (4); the lower head beam (4) includes an extended flexible member (41) and a protective pad (42); the extended flexible member (41) is strip-shaped, and its two ends are connected to the left speaker (1) and the right speaker (2) respectively, and the protective pad (42) wraps around the extended flexible member (41), and the extended flexible member (41) can stretch and shorten according to the magnitude of the tensile force.

2. The portable Bluetooth headset with a retractable headband as described in claim 1, characterized in that, The protective padding layer (42) includes an upper padding layer (421) disposed above the stretchable flexible member (41) and a lower padding layer (422) disposed below the stretchable flexible member (41); one side of the upper padding layer (421) is connected to the lower padding layer (422) in a hinge-like manner; the other side of the upper padding layer (421) is detachably connected to the other side of the lower padding layer (422) by mutually cooperating Velcro (43).

3. The portable Bluetooth headset with a retractable headband as described in claim 1, characterized in that, The lower head beam (4) also includes a rigid left connector (44) and a right connector (45). The two ends of the extended flexible member are fixedly / rotatably connected to the left connector (44) and the right connector (45). The protective pad (42) cooperates with the left connector (44) and the right connector (45) to surround the extended flexible member (41). The left connector (44) is connected to the left speaker (1), and the right connector (45) is connected to the right speaker (2).

4. The portable Bluetooth headset with a retractable headband as described in claim 1, characterized in that, The upper beam (3) includes a central rod (31) located in the middle, a left sleeve rod (32) movably sleeved on the left end of the central rod (31), and a right sleeve rod (33) movably sleeved on the right end of the central rod (31); the left sleeve rod (32) is connected to the left speaker (1), and the right sleeve rod (33) is connected to the right speaker (2).

5. The portable Bluetooth headset with a retractable headband as described in claim 4, characterized in that, A flexible resistance ring (34) is provided between the middle rod (31) and the left sleeve rod (32), and between the middle rod (31) and the right sleeve rod (33). The thickness of the flexible resistance ring (34) is not less than the gap between the middle rod (31) and the left sleeve rod (32), and not less than the gap between the middle rod (31) and the right sleeve rod (33).

6. The portable Bluetooth headset with a retractable headband as described in claim 4, characterized in that, The middle rod (31) is provided with a rod limiting protrusion at the end corresponding to the left sleeve rod (32), and the rod limiting protrusion faces and abuts against the left sleeve rod (32); the left sleeve rod (32) is provided with a left limiting protrusion at its end, and the left limiting protrusion faces and abuts against the middle rod (31); when the left sleeve rod (32) moves to the position where it is about to detach from the middle rod (31), the rod limiting protrusion blocks the movement path of the left limiting protrusion, preventing the left sleeve rod (32) from detaching from the middle rod (31). The middle rod (31) is provided with a rod limiting protrusion at the end corresponding to the right sleeve rod (33), and the rod limiting protrusion faces and abuts against the right sleeve rod (33); the right sleeve rod (33) is provided with a right limiting protrusion at the end, and the right limiting protrusion faces and abuts against the middle rod (31); when the right sleeve rod (33) moves to the position where it is about to detach from the middle rod (31), the rod limiting protrusion blocks the movement path of the right limiting protrusion, preventing the right sleeve rod (33) from detaching from the middle rod (31).

7. The portable Bluetooth headset with a retractable headband as described in claim 4, characterized in that, The left sleeve (32) and the right sleeve (33) are provided with sliding grooves (37), and the two ends of the lower head beam (4) are movably disposed on the sliding grooves.

8. The portable Bluetooth headset with a retractable headband as described in claim 1, characterized in that, It also includes a mandibular band (5), the two ends of which are connected to the left vocal part (1) and the right vocal part (2), respectively.

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