Earphone

Abstract

The utility model discloses an earphone. The earphone comprises a first ear shell, a second ear shell and a headband. The head band comprises a fixed arm and a connecting arm, the connecting arm can slide relative to the fixed arm, so that the length of the part, exposed out of the connecting arm, of the fixed arm is changed, a first guide column is arranged on the connecting arm, a first guide groove is formed in the outer surface of the fixed arm, and the first guide column is arranged in the first guide groove in a sliding mode. When the first guide groove is formed in the inner surface of the fixing arm, if the headband is formed in an injection molding mode, a protrusion is arranged at the position, corresponding to the first guide groove, of a mold, demolding is inconvenient, and if the headband is formed and then the first guide groove is machined in a cutting mode, a machining tool cannot stretch into the fixing arm conveniently. And the first guide groove is formed in the outer surface of the fixed arm, demolding is more convenient in the injection molding process, a machining tool has a larger moving space compared with internal machining in subsequent machining, and therefore machining is convenient.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, specifically to a type of headphone. Background Technology

[0002] There are many types of headphones. To get a better listening experience, many people choose to use over-ear headphones. However, over-ear headphones have disadvantages such as being large and difficult to store. In order to better store them, existing technologies use a telescopic structure. The fixed arm is sleeved outside the connecting arm. There is a groove inside the fixed arm and a protrusion matching the groove on the outside of the connecting arm. However, the shape of this structure is complex and the groove is difficult to process. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an earphone in which a guide groove is formed on the outer surface of the fixing arm, facilitating processing.

[0004] The earphone according to an embodiment of the present invention includes a first ear shell, a second ear shell, and a headband. The first ear shell is connected to a first end of the headband, and the second ear shell is connected to a second end of the headband. The headband includes a fixed arm and a connecting arm. The connecting arm is sleeved outside the fixed arm and can slide relative to the fixed arm, thereby changing the length of the portion of the fixed arm exposed outside the connecting arm. The connecting arm is provided with a first guide post, and the outer surface of the fixed arm is provided with a first guide groove. The first guide post is slidably disposed in the first guide groove.

[0005] The earphone according to the embodiment of this utility model has at least the following beneficial effects: the connecting arm is sleeved on the outside of the fixed arm, and a first guide groove is provided on the outer surface of the fixed arm, making the structure simpler and clearer, and easier to process compared to setting the first guide groove on the inner surface. Specifically, when the first guide groove is set on the inner surface of the fixed arm, if the headband is injection molded, the mold position corresponding to the first guide groove has a protrusion, which is inconvenient for demolding. If the first guide groove is processed by cutting or other means after the earphone is molded, it is also inconvenient for the processing tool to extend into the fixed arm. However, setting the first guide groove on the outer surface of the fixed arm makes demolding easier during the injection molding process, and the processing tool has more room to move in subsequent processing compared to processing inside, thus making processing more convenient.

[0006] According to some embodiments of the present invention, the headband further includes a spring piece, the inner surface of the connecting arm is provided with a spring piece, and the spring piece abuts against the outer surface of the fixing arm; or, the headband further includes a spring piece, the outer surface of the fixing arm is provided with a spring piece, and the spring piece abuts against the inner surface of the connecting arm.

[0007] According to some embodiments of the present invention, there are two connecting arms, namely a first connecting arm and a second connecting arm. The first connecting arm and the second connecting arm are respectively sleeved on both ends of the fixed arm. The first connecting arm is connected to the first ear shell, and the second connecting arm is connected to the second ear shell.

[0008] According to some embodiments of the present invention, the fixed arm includes a first fixed arm, a second fixed arm and a pin, a first connecting arm is sleeved on the first fixed arm, a second connecting arm is sleeved on the second fixed arm, and the first fixed arm and the second fixed arm are rotatably connected.

[0009] According to some embodiments of this utility model, the connecting arm includes multiple sub-arm segments, which are stacked sequentially. Any two adjacent sub-arm segments can slide relative to each other. The outermost sub-arm segment of the connecting arm is connected to a first ear shell or a second ear shell, and the innermost sub-arm segment is sleeved on the outside of the fixed arm. Each sub-arm segment has a second guide post on its inner surface. The second guide post of the innermost sub-arm segment is the first guide post. Except for the outermost sub-arm segment, the outer surfaces of the remaining sub-arm segments have second guide grooves. For two adjacent sub-arm segments, the second guide post of the outer sub-arm segment is slidably disposed in the second guide groove of the inner sub-arm segment.

[0010] According to some embodiments of the present invention, the earphone has a retracted state, and when the earphone is in the retracted state, the end faces of multiple sub-arm segments are flush.

[0011] According to some embodiments of the present invention, the first ear shell includes a first receiving surface facing the second ear shell, the second ear shell includes a second receiving surface facing the first ear shell, the earphone has a retracted state, and when the earphone is in the retracted state, the first receiving surface and the second receiving surface are in contact with each other.

[0012] According to some embodiments of the present invention, the first guide groove and the second guide groove are arc-shaped, and when viewed along the axial direction of the first guide post, the first guide groove and the second guide groove are located on the same circle.

[0013] According to some embodiments of the present invention, the first guide post is detachably connected to the connecting arm, and / or the second guide post is detachably connected to the connecting arm.

[0014] According to some embodiments of the present invention, the cross-sectional shape of the connecting arm is rectangular, and the cross-sectional shape of the fixed arm is rectangular.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a perspective view of the headphones in one embodiment of the present invention;

[0018] Figure 2 This is a front view of the earphone in one embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of the headphones in the open state according to one embodiment of the present invention;

[0020] Figure 4 This is a partial exploded view of the earphone in one embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of the retracted state of the headphones in one embodiment of the present invention;

[0022] Figure 6 This is a cross-sectional view of an earphone with a spring-loaded structure according to one embodiment of the present invention.

[0023] Reference numerals: Earphone 100, First ear shell 101, Second ear shell 102, Headband 103, Fixing arm 104, Connecting arm 105, First guide post 106, First guide groove 107, Sub-arm segment 108, Second guide post 109, Second guide groove 110, First connecting arm 201, Second connecting arm 202, First fixing arm 203, Second fixing arm 204, Pin 205, End face 206, Circle 207, First receiving surface 301, Second receiving surface 302, Spring 601. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, front, back, first, second, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] refer to Figure 1 According to an embodiment of the present invention, the earphone 100 includes a first ear shell 101, a second ear shell 102, and a headband 103. The first ear shell 101 is connected to a first end of the headband 103, and the second ear shell 102 is connected to a second end of the headband 103. The headband 103 includes a fixing arm 104 and a connecting arm 105. The connecting arm 105 is sleeved on the outside of the fixing arm 104 and can slide relative to the fixing arm 104, thereby changing the length of the portion of the fixing arm 104 exposed outside the connecting arm 105. The connecting arm 105 is provided with a first guide post 106, and the outer surface of the fixing arm 104 is provided with a first guide groove 107. The first guide post 106 is slidably disposed in the first guide groove 107. The connecting arm 105 is sleeved on the outside of the fixing arm 104, and the first guide groove 107 is provided on the outer surface of the fixing arm 104 for easy processing. Specifically, when the first guide groove 107 is set on the inner surface of the fixed arm 104, if the headband 103 is injection molded, the mold position corresponding to the first guide groove 107 has a protrusion, which is inconvenient for demolding. If the first guide groove 107 is processed by cutting or other means after the earphone 100 is formed, it is also inconvenient for the processing tool to extend into the fixed arm 104. However, setting the first guide groove 107 on the outer surface of the fixed arm 104 makes demolding easier during the injection molding process. In subsequent processing, the processing tool has more room to move compared to processing inside, so processing is convenient.

[0030] In the prior art, the fixed arm 104 is designed as a hollow structure, and the connecting arm 105 is placed inside the fixed arm 104 for sliding. This design causes the headband 103 to gradually taper from the middle to both ends. The connection part between the headband 103 and the first ear shell 101 or the second ear shell 102 is thinner than the middle. This structure is unstable and also limits the design of the multi-segment connecting arm 105, resulting in significant limitations and limited telescopic space. It should be noted that, according to reference... Figure 1 In this embodiment of the utility model, the connecting arm 105 has a multi-segment structure. Therefore, by fitting the multi-segment connecting arm 105 onto the outer surface of the fixed arm 104 and then extending and retracting it, the end of the headband 103 can be thicker than the middle segment, making it more stable when connected to the first ear shell 101 or the second ear shell 102.

[0031] It should be noted that the reference Figure 1 , Figure 3 and Figure 5 In some embodiments of this utility model, when the first guide post 106 abuts against the outermost end of the first guide groove 107, the relative distance between the connecting arm 105 and the fixed arm 104 is the farthest, and the earphone 100 is in the open state; when the first guide post 106 abuts against the innermost end of the first guide groove 107, the relative distance between the connecting arm 105 and the fixed arm 104 is the closest, and the earphone 100 is in the retracted state. This design makes it easier to open and close the earphone 100; it can be pulled outwards or retracted inwards, and the open and retracted states are naturally achieved when the first guide post 106 abuts against the first guide groove 107.

[0032] It should be noted that the reference Figure 1 In some embodiments of this utility model, the first guide groove 107 and the second guide groove 110 (hereinafter referred to as the second guide groove) are formed on the side surfaces of the connecting arm 105 and the fixed arm 104, or they can be formed on the upper or lower surfaces of the connecting arm 105 and the fixed arm 104. Sliding first guide posts 106 and second guide posts 109 are provided at corresponding positions. Preferably, whether on the side surfaces or the upper and lower surfaces, the first guide groove 107 and the second guide groove 110 are formed in the middle portion, which allows for more even force distribution among the components during the opening and closing of the earphone 100.

[0033] refer to Figure 6In some embodiments of this utility model, the headband 103 further includes a spring piece 601. The inner surface of the connecting arm 105 is provided with the spring piece 601, and the spring piece 601 abuts against the outer surface of the fixing arm 104. Alternatively, the headband 103 further includes a spring piece 601, and the outer surface of the fixing arm 104 is provided with the spring piece 601, which abuts against the inner surface of the connecting arm 105. The rebound force of the spring piece 601 can increase the friction between the connecting arm 105 and the fixing arm 104, improve the damping feel, thereby reducing the relative sliding between the connecting arm 105 and the fixing arm 104 during use, making the structure more stable. Figure 6 As shown, the placement of the spring piece 601 will not affect the sliding of the first guide post 106 within the first guide groove 107, and the movements of the two will not interfere with each other. Furthermore, in some embodiments of this invention, the spring piece 601 can also be disposed on the same side surface of the first guide groove 107, as long as its position does not interfere with the movement of the first guide post 106 and the first guide groove 107.

[0034] It should be noted that in some embodiments of this utility model, the first guide groove 107 and the second guide groove 110 are wavy in shape. When an external force is applied, the first guide post 106 and the second guide post 109 can slide within the first guide groove 107 and the second guide groove 110. When no external force is applied, they will be abutted by the wavy protrusions. This design can also make the opening and closing of the earphone 100 have a damping feel, and reduce the relative sliding between the connecting arm 105 and the fixing arm 104 during use, making the structure more stable.

[0035] refer to Figure 2 In some embodiments of this utility model, two connecting arms 105 are provided, namely a first connecting arm 201 and a second connecting arm 202. The first connecting arm 201 and the second connecting arm 202 are respectively sleeved on both ends of the fixed arm 104. The first connecting arm 201 is connected to the first ear shell 101, and the second connecting arm 202 is connected to the second ear shell 102. Under the premise that the total length of the headband 103 and the length of the fixed arm 104 remain unchanged, setting the first connecting arm 201 and the second connecting arm 202 respectively sleeved on both ends of the fixed arm 104 is shorter than setting a single connecting arm 105 on one end of the fixed arm 104. Since the earphone 100 needs to be retracted, the connecting arm 105 is often... Figure 1 The structure shown has multiple segments, with the outer segments being larger. The two connecting arms 105 shorten the length of each connecting arm 105, which effectively reduces the end size of the connecting arm 105, thereby reducing the overall size of the headphone 100 and meeting the miniaturization requirements.

[0036] It should be noted that the reference Figure 2In some embodiments of this utility model, the first connecting arm 201 and the second connecting arm 202 are of equal length and are symmetrically arranged at both ends of the fixed arm 104. The symmetrical design can minimize the maximum length of the first connecting arm 201 and the second connecting arm 202, reduce the size of the connecting arm 105 to the maximum extent to prevent the size of the end connecting arm 105 from being too large, and the symmetrical design can also meet the requirements of uniform force distribution and aesthetics.

[0037] refer to Figure 2 In some embodiments of this utility model, the fixing arm 104 includes a first fixing arm 203, a second fixing arm 204, and a pin 205. A first connecting arm 201 is sleeved on the first fixing arm 203, and a second connecting arm 202 is sleeved on the second fixing arm 204. The first fixing arm 203 and the second fixing arm 204 are rotatably connected. The first fixing arm 203 and the second fixing arm 204 can rotate relative to each other, allowing the left and right ends of the earphone 100 to come together. This makes the structure of the earphone 100 more compact in the retracted state, giving the earphone 100 not only the function of retracting both ends but also a folding effect, making it more convenient to store.

[0038] It should be noted that the reference Figure 1 and Figure 4 In some embodiments of this utility model, the connection end between the first fixing arm 203 and the pin 205 is a double-ear structure, and the connection end between the second fixing arm 204 and the pin 205 is a single-ear structure. The single-ear structure of the second fixing arm 204 is sandwiched between the double-ear structure of the first fixing arm 203. This design increases the contact area and friction area between the first fixing arm 203 and the second fixing arm 204, making the connection more stable. The symmetrical double-ear design also ensures that when the second fixing arm 204 is subjected to an external force in the axial direction of the rotating shaft, both ends of the double-ear structure of the first fixing arm 203 simultaneously abut against it, resulting in more even force distribution. In some embodiments of this utility model, the first fixing arm 203 uses a single-ear structure, and the second fixing arm 204 uses a double-ear structure, achieving the same technical effect.

[0039] It should be noted that in some embodiments of this utility model, the connection between the first fixed arm 203 and the second fixed arm 204 can be achieved by means of hinge, ratchet connection, etc., in addition to using a pin 205, so that relative rotation can be achieved.

[0040] It should be noted that in some embodiments of this utility model, a limiting block can also be provided on the first fixed arm 203 or the second fixed arm 204, so that when the earphone 100 is in the open state, the limiting block restricts its continued rotation. This can make the open state of the earphone 100 more stable and prevent damage caused by excessive relative rotation.

[0041] refer to Figures 1 to 3 In some embodiments of this utility model, the connecting arm 105 includes multiple sub-arm segments 108, which are stacked sequentially. Any two adjacent sub-arm segments 108 can slide relative to each other. The outermost sub-arm segment 108 of the connecting arm 105 is connected to the first ear shell 101 or the second ear shell 102, and the innermost sub-arm segment 108 of the connecting arm 105 is sleeved on the outside of the fixing arm 104. The inner surface of each sub-arm segment 108 is provided with a second guide post 109. The second guide post 109 of the innermost layer of the connecting arm 105 is also the first guide post 106. Except for the outermost sub-arm segment 108 of the connecting arm 105, the outer surface of the remaining sub-arm segments 108 is provided with a second guide groove 110. For two adjacent sub-arm segments 108, the second guide post 109 of the outer sub-arm segment 108 is slidably disposed in the second guide groove 110 of the inner sub-arm segment 108. Setting multiple sub-arm segments 108 allows each segment to be shorter, resulting in a smaller overall size after shrinkage. The second guide post 109 and the second guide groove 110 also facilitate the relative sliding between adjacent sub-arm segments 108. In some embodiments of this utility model, the width of the first guide groove 107 and the second guide groove 110 are the same, and the size of the first guide post 106 and the second guide post 109 are the same. This design facilitates the mass production of product parts.

[0042] It should be noted that the reference Figure 1 In some embodiments of this utility model, for two adjacent sub-arm segments 108, the inner surface of the outer sub-arm segment 108 abuts against the outer surface of the inner sub-arm segment 108, and the inner surface of the sub-arm segment 108 sleeved outside the fixed arm 104 abuts against the outer surface of the fixed arm 104. This design can reduce the relative sway between the fixed arm 104 and the sub-arm segments 108, and between adjacent sub-arm segments 108, during the opening and closing of the earphone 100, thereby improving the structural stability during the opening and closing process.

[0043] refer to Figure 3 and Figure 5 In some embodiments of this utility model, the earphone 100 has a retracted state. When the earphone 100 is in the retracted state, the end faces 206 of multiple sub-arm segments 108 are flush. All sub-arm segments 108 are provided with channels and openings that allow the sub-arm segments 108 or the fixed arm 104 to slide. The end face 206 of the sub-arm segment 108 refers to the end face 206 through which the opening of the sub-arm segment 108 or the fixed arm 104 passes. The flush end faces 206 can improve the aesthetics of the structure after retraction. The end faces 206 of the inner sub-arm segments 108 will not protrude outward, which also improves the utilization rate of the channels inside the sub-arm segments 108. If the end face 206 of the outer sub-arm segments 108 is higher than the end face 206 of the inner sub-arm segments 108, it means that there is still room in the channels inside the outer sub-arm segments 108, and the space utilization rate is reduced.

[0044] In some embodiments of this utility model, the earphone 100 is a music earphone, and a speaker is also provided in the first ear shell 101 and the second ear shell 102. The speaker's wiring can be set in the channel of the fixed arm 104, which can effectively save space and improve space utilization.

[0045] refer to Figure 3 and Figure 5 In some embodiments of this utility model, the first ear shell 101 includes a first receiving surface 301 facing the second ear shell 102, and the second ear shell 102 includes a second receiving surface 302 facing the first ear shell 101. The earphone 100 has a retracted state. When the earphone 100 is in the retracted state, the first receiving surface 301 and the second receiving surface 302 are in contact with each other. The contact of the first receiving surface 301 and the second receiving surface 302 can firstly improve the space utilization in the retracted state and reduce unnecessary gaps. Secondly, when the earphone 100 is in the retracted state, i.e., the non-use state, the contact of the first receiving surface 301 and the second receiving surface 302 can also prevent dust or debris from falling into the first ear shell 101 and the second ear shell 102, improving the cleanliness of the earphone 100 when it is not in use.

[0046] refer to Figure 2 In some embodiments of this utility model, the first guide groove 107 and the second guide groove 110 are arc-shaped, and when viewed along the axial direction of the first guide post 106, the first guide groove 107 and the second guide groove 110 are located on the same circle 207. The sliding of the first guide groove 107 and the second guide groove 110 along the same arc-shaped trajectory can make the earphone 100 smoother in the process of unfolding and retracting.

[0047] It should be noted that in some embodiments of this utility model, the first guide groove 107 and the second guide groove 110 are formed on the upper surface of the fixed arm 104 and the connecting arm 105. When the earphone 100 is viewed from top to bottom, the first guide groove 107 and the second guide groove 110 are located on the same straight line. This design still makes the unfolding and retraction process of the earphone 100 smoother.

[0048] refer to Figure 4In some embodiments of this utility model, the first guide post 106 is detachably connected to the connecting arm 105, and / or the second guide post 109 is detachably connected to the connecting arm 105. The detachable connection makes the assembly and disassembly of the earphone 100 more convenient. Specifically, in some embodiments of this utility model, the assembly process of the earphone 100 is as follows: First, the first fixing arm 203 and the second fixing arm 204 are fixed by inserting pins 205. Then, the sub-arm segment 108 is fitted onto the outer surface of the fixing arm 104. The first guide post 106 is inserted at the corresponding position of the first guide groove 107. After assembly, a larger sub-arm segment 108 is fitted onto the outer layer of the sub-arm segment 108. After fitting, the second guide post 109 is inserted at the corresponding position of the second guide groove 110. This process is repeated until assembly is complete. The assembly process is convenient and simple.

[0049] refer to Figure 1 and Figure 3 In some embodiments of this utility model, the cross-sectional shape of the connecting arm 105 is rectangular, and the cross-sectional shape of the fixing arm 104 is rectangular. The cross-section refers to the normal cross-section of the connecting arm 105 and the fixing arm 104 relative to the sliding direction during the opening and closing of the earphone 100. The rectangular cross-section allows the earphone 100 to have a larger contact area with the wearer during use, reducing the pressure per unit area and improving comfort.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. Headphones, characterized in that, include: The headband consists of a first ear shell, a second ear shell, and a headband, wherein the first ear shell is connected to a first end of the headband and the second ear shell is connected to a second end of the headband. The headband includes a fixed arm and a connecting arm. The connecting arm is sleeved outside the fixed arm and can slide relative to the fixed arm, thereby changing the length of the portion of the fixed arm exposed outside the connecting arm. The connecting arm is provided with a first guide post, and the outer surface of the fixed arm is provided with a first guide groove. The first guide post is slidably disposed in the first guide groove.

2. The earphone according to claim 1, characterized in that, The headband further includes a spring piece, the inner surface of the connecting arm is provided with the spring piece, and the spring piece abuts against the outer surface of the fixing arm; or, the headband further includes a spring piece, the outer surface of the fixing arm is provided with the spring piece, and the spring piece abuts against the inner surface of the connecting arm.

3. The earphone according to claim 1, characterized in that, The connecting arm is provided in two parts, namely a first connecting arm and a second connecting arm. The first connecting arm and the second connecting arm are respectively sleeved on both ends of the fixed arm. The first connecting arm is connected to the first ear shell, and the second connecting arm is connected to the second ear shell.

4. The earphone according to claim 3, characterized in that, The fixed arm includes a first fixed arm, a second fixed arm, and a pin. The first connecting arm is sleeved on the first fixed arm, and the second connecting arm is sleeved on the second fixed arm. The first fixed arm and the second fixed arm are rotatably connected.

5. The earphone according to claim 1, characterized in that, The connecting arm includes multiple sub-arm segments, which are stacked and nested sequentially. Any two adjacent sub-arm segments can slide relative to each other. The outermost sub-arm segment of the connecting arm is connected to the first ear shell or the second ear shell, and the innermost sub-arm segment of the connecting arm is sleeved on the outside of the fixed arm. Each of the sub-arm segments has a second guide post on its inner surface. The second guide post located at the innermost layer of the connecting arm is the first guide post. Except for the sub-arm segment located at the outermost layer of the connecting arm, the outer surfaces of the other sub-arm segments are provided with second guide grooves. For two adjacent sub-arm segments, the second guide post of the outer sub-arm segment is slidably disposed in the second guide groove of the inner sub-arm segment.

6. The earphone according to claim 5, characterized in that, The earphone has a retracted state, and when the earphone is in the retracted state, the end faces of the plurality of sub-arm segments are flush.

7. The earphone according to claim 5, characterized in that, The first ear shell includes a first receiving surface facing the second ear shell, and the second ear shell includes a second receiving surface facing the first ear shell. The earphone has a retracted state, and when the earphone is in the retracted state, the first receiving surface and the second receiving surface are in contact with each other.

8. The headphones according to claim 5, characterized in that, The first guide groove and the second guide groove are arc-shaped, and when viewed along the axial direction of the first guide post, the first guide groove and the second guide groove are located on the same circle.

9. The earphone according to claim 5, characterized in that, The first guide post is detachably connected to the connecting arm, and / or the second guide post is detachably connected to the connecting arm.

10. The earphone according to claim 1, characterized in that, The connecting arm has a rectangular cross-section, and the fixed arm has a rectangular cross-section.

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