CN211702346U

CN211702346U - Bone conduction earphone and core module thereof

Info

Publication number: CN211702346U
Application number: CN202020719524.7U
Authority: CN
Inventors: 王永根; 刘志青; 王真; 毛辛男
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-10-16
Anticipated expiration: 2030-04-30

Abstract

The application mainly relates to a bone conduction earphone and a core module thereof, wherein the core module comprises a core shell, a core support, a core and a cover plate, one end of the core shell is open, the core support and the core are contained in the core shell, the core is hung on the core support, the cover plate is covered on the open end of the core shell, the cover plate is arranged on one side of the core shell and is abutted to a pressing structure, and the abutting to the pressing structure is used for abutting the core support to press and fixing the core support in the core shell. The application provides a core module sets up its core in the core casing with the help of the core support to through the support that sets up on the apron press structure and core support cooperation, make core support and core casing keep relatively fixed, with the degree of freedom between restriction core support and the core casing effectively, and then fix the core in the core casing, the reliability is high.

Description

Bone conduction earphone and core module thereof

Technical Field

The application relates to the technical field of bone conduction, in particular to a bone conduction earphone and a machine core module thereof.

Background

Bone conduction is a sound conduction mode, namely, an electric signal is converted into mechanical vibration, and the mechanical vibration is transmitted through the skull, the bone labyrinth, the lymph fluid of the inner ear, the spiral organ, the auditory spirit and the auditory center of the cerebral cortex of a human body to realize the transmission of sound waves. The bone conduction earphone utilizes bone conduction technology to receive the telephone, clings to the skull, and the sound wave can be directly transmitted to the auditory nerve through the bone without passing through the external auditory canal and the eardrum, so that the ears can be liberated.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a core module for bone conduction earphone, wherein, this core module includes core housing, core support, core and apron, the one end opening of core housing, core support and core holding are in core housing, the core is hung and is established on core support, the apron lid is established on core housing's opening end, the apron sets up towards one side of core housing and supports the pressure structure, supports the pressure structure and is used for supporting the pressure with core support and fixes in core housing.

The embodiment of the application further provides a bone conduction headset, wherein, this bone conduction headset includes ear-hang subassembly, battery and foretell core module, and the core module sets up the one end at the ear-hang subassembly, and the battery setting is at the other end of ear-hang subassembly.

The beneficial effect of this application is: the application provides a core module sets up its core in the core casing with the help of the core support to through the support that sets up on the apron press structure and core support cooperation, make core support and core casing keep relatively fixed, with the degree of freedom between restriction core support and the core casing effectively, and then fix the core in the core casing, the reliability is high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded view of an embodiment of a bone conduction headset provided herein;

FIG. 2 is an exploded view of one embodiment of the earhook assembly of FIG. 1;

FIG. 3 is a schematic view of the earhook housing of FIG. 2;

FIG. 4 is an exploded view of another embodiment of the earhook assembly of FIG. 1;

FIG. 5 is a schematic view of the earhook housing of FIG. 4;

FIG. 6 is a schematic view of the side of the ornamental support of FIG. 4 adjacent to the earhook housing;

FIG. 7 is a schematic diagram of one embodiment of an activation button of the trim bracket of FIG. 4;

fig. 8 is an exploded view of an embodiment of the movement module of fig. 1;

fig. 9 is a frequency response curve of a bone conduction headset according to an embodiment of the present application;

FIG. 10 is a cross-sectional view of one embodiment of a reinforcing structure provided on the earhook housing of FIG. 8;

FIG. 11 is a schematic top view of another embodiment of a reinforcing structure provided on the earhook housing of FIG. 8;

FIG. 12 is a frequency response curve corresponding to the various reinforcing structures of FIGS. 10 and 11;

fig. 13 is a schematic cross-sectional view taken along the direction I-I of the core module of fig. 8 after assembly;

FIG. 14 is a schematic structural view of an embodiment of the core support of FIG. 8;

fig. 15 is a schematic top view of the core module of fig. 8 after assembly;

fig. 16 is an exploded view of another embodiment of the core module of fig. 1;

FIG. 17 is a frequency response curve for the configuration of FIG. 14 in which different types of gel are disposed between the earhook assembly and the cover plate;

fig. 18 is a schematic sectional view along direction II-II of the core module of fig. 16 after assembly;

fig. 19 is a schematic view of the cover plate of fig. 16 on a side thereof adjacent to the deck housing;

FIG. 20 is a schematic top view of the cover plate of FIG. 19;

fig. 21 is an exploded view of the core module of fig. 16 from another perspective;

FIG. 22 is a schematic top view of the cover plate of FIG. 21;

figure 23 is a schematic representation of the movement in an embodiment of the application;

FIG. 24 is a schematic representation of the magnet versus force coefficient BL of FIG. 23;

FIG. 25 is a graph showing the thickness of the flux cap and the flux guide plate of FIG. 23 versus the force coefficient BL;

FIG. 26 is a graph of the height of the flux guide of FIG. 23 versus force coefficient BL;

fig. 27 is a schematic view of the bone conduction headset of fig. 1 in a non-wearing state;

FIG. 28 is a schematic cross-sectional view of the rear suspension assembly of FIG. 1 taken along the direction III-III.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. In particular, it is noted that: the following examples are intended to illustrate the present application, but are not intended to limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. Those skilled in the art understand explicitly and implicitly that: the embodiments described herein may be combined with other embodiments.

As shown in fig. 1 to 5, the bone conduction headset 10 may include two movement modules 20, two ear hook assemblies 30, a rear hook assembly 40, a main control circuit board 50, and a battery 60. Wherein, the one end of two ear-hang subassemblies 30 is connected respectively with the core module 20 that corresponds, and the both ends of back-hang subassembly 40 are connected with the other end that two ear-hang subassemblies 30 keep away from core module 20 respectively. Further, the two ear hook assemblies 30 are respectively configured to be hung outside two ears of the user, and the rear hook assembly 40 is configured to be wound around the rear side of the head of the user, so as to meet the requirement of the user to wear the bone conduction headset 10. The arrangement is such that when the bone conduction headset 10 is in a wearing state, the two movement modules 20 are respectively positioned at the left side and the right side of the head of the user; under the matching action of the two ear-hang assemblies 30 and the rear-hang assembly 40, the two movement modules 20 can clamp the head of the user and contact with the skin of the user, and then sound transmission can be realized based on the bone conduction technology.

Further, the main control circuit board 50 and the battery 60 may be disposed within the same earhook assembly 30; or may be separately disposed within the two ear hook assemblies 30, the specific structure of which will be described in detail later. The main control circuit board 50 and the battery 60 may be connected to the two core modules 20 through conductors (not shown in fig. 1 to 5), the former may be used to control sound emission of the core modules 20 (mainly, electrical signals are converted into mechanical vibrations), and the latter may be used to provide electrical energy to the bone conduction headset 10 (specifically, the two core modules 20). Of course, the bone conduction headset 10 described herein may also include a microphone, a microphone such as a microphone, and a communication element such as bluetooth, which may also be connected to the main control circuit board 50 and the battery 60 via wires to achieve the corresponding functions.

It should be noted that: this application core module 20 be provided with two, two core modules 20 all can the sound production, mainly be for the ease of bone conduction earphone 10 realizes the stereo audio to improve the user's of bone conduction earphone 10 good feeling degree. Therefore, in other application scenarios where the requirement for stereo is not particularly high, such as hearing assistance of hearing patients, live prompt of a host, etc., the bone conduction headset 10 may be provided with only one core module 20. Further, the conductor may be a wire, and is mainly used for electrically connecting the electronic components of the bone conduction headset 10; if there are a plurality of circuits to be electrically connected, the conductors may be correspondingly provided in a plurality of strands, and the above-mentioned conductors may be simply understood as a plurality of strands of wires.

As shown in fig. 2, the ear hook assembly 30 can include an ear hook housing 31 and a decorative element 32, which can be connected by one or a combination of adhesive bonding, clamping, screwing, and the like. The decoration 32 is located on a side of the ear-hook housing 31 away from the core module 20 when the bone conduction earphone 10 is in a wearing state, that is, located on an outer side of the bone conduction earphone 10, so that the decoration 32 decorates the ear-hook housing 31, and the aesthetic appearance of the bone conduction earphone 10 is improved. At this time, the decoration 32 may protrude from the ear hook case 31 or may be embedded in the ear hook case 31. Further, the decoration 32 may be, but not limited to, a sticker, a plastic part, a metal part, etc., on which a geometric pattern, a cartoon pattern, a logo pattern, etc. may be printed, and may also be coated with a fluorescent material, a reflective material, etc. to achieve a corresponding decoration effect.

As shown in fig. 2 and 3, the earhook housing 31 may include an earphone fixing portion 311, a bending transition portion 312, and a receiving chamber 313 connected in sequence. The earphone fixing portion 311 is used for fixing the movement module 20, and the matching relationship between the two will be described in detail later. The bending transition part 312 connects the accommodation chamber 313 and the earphone fixing part 311, and is bent to hang on the outside of the human ear. Further, one end of the accommodating chamber 313, which is far away from the earphone fixing portion 311, may be connected to the rear suspension assembly 40 by one or a combination of assembling manners such as glue joint, clamping joint, and screw connection, so as to facilitate the assembly between the ear suspension assembly 30 and the rear suspension assembly 40. One end of the accommodating chamber 313 is open so as to accommodate the main control circuit board 50 or the battery 60. At this time, the ear-hook shell 31 may further include a bin cover 314, and the bin cover 314 is covered on the opening end of the accommodating bin 313.

Further, when the receiving compartment 313 is mainly used for receiving the main control circuit board 50, as shown in fig. 2, the ear-hook assembly 30 may further include a control key 33 and a TYPE-c (usb) interface 34. The control key 33 and the TYPE-c (usb) interface 34 may be disposed on the accommodating compartment 313, so that the two interfaces are connected to the main control circuit board 50, thereby shortening the distance of the wire. At this time, the control key 33 and the TYPE-c (usb) interface 34 may be partially exposed outside the ear-hang case 31 for the user to perform corresponding operations. So set up, control key 33 can be used to realize the function such as opening and closing, the regulation of volume of bone conduction earphone 10, TYPE-C (USB) interface 34 can be used to realize data transmission, function such as charging. In addition, the ear-hook assembly 30 may also include an indicator light 35. The indicator light 35 may be disposed on the accommodating chamber 313, so as to be connected to the main control circuit board 50, thereby shortening the distance of the wire. At this time, the indicator light 35 may be partially exposed outside the ear-hang shell 31, as shown in fig. 2; and may specifically include an LED light source hidden in the earhook housing 31 and a light guide partially exposed outside the earhook housing 31 (not shown in fig. 2 and 3). So set up, pilot lamp 35 can charge at bone conduction earphone 10, the electric quantity is not enough etc. under the scene suggestion.

It should be noted that: when the bone conduction headset 10 is in a worn state, the bone conduction headset 10 will hang outside the human ear. Specifically, the movement module 20 is generally located on the front side of the human ear, and the main control circuit board 50 or the battery 60 is generally located on the rear side of the human ear. At this time, the human ear supports the bone conduction headset 10 as a fulcrum, so that the human ear will bear most of the weight of the bone conduction headset 10. The user may cause discomfort after wearing the bone conduction headset 10 for a long time. For this reason, the earhook housing 31 (especially the bending transition 312 portion) is generally made of a softer material, so as to improve the wearing comfort of the bone conduction headset 10. The material of the ear hanging shell 31 may be, but is not limited to, Polycarbonate (PC), Polyamide (PA), Acrylonitrile Butadiene Styrene (ABS), Polystyrene (PS), High Impact Polystyrene (High Impact Polystyrene, HIPS), Polypropylene (PP), Polyethylene Terephthalate (PET), Polyvinyl Chloride (PVC), Polyurethane (PU), Polyethylene (PE), Phenol Formaldehyde (PF), Urea Formaldehyde (Urea Formaldehyde, UF), Melamine Formaldehyde (MF), silicone, and the like. Further, since the ear hook housing 31 is soft in texture, there is a risk that the ear hook housing 31 is insufficient in rigidity and difficult to maintain its structure by an external force, and even is insufficient in strength to break. For this purpose, the earhook housing 31 may be provided with an elastic wire (not shown in fig. 3) inside (at least in the bent transition 312 portion) in order to improve the strength of the earhook housing 31 and thus increase the reliability of the earhook housing 31. The elastic metal wire may be made of spring steel, titanium alloy, titanium-nickel alloy, chromium-molybdenum steel, etc. In this case, the ear shell 31 may be a metal insert injection molded integral structure.

Based on the above detailed description, since the movement module 20 is disposed at one end of the ear-hook component 30 (specifically, at the end where the earphone fixing portion 311 is located), and the main control circuit board 50 or the battery 60 is disposed at the other end of the ear-hook component 30 (specifically, at the other end where the accommodating chamber 313 is located), when the movement module 20 is connected to the main control circuit board 50 and the battery 60 through a wire, the wire at least passes through the region where the bending transition portion 312 is located. Generally, for the aesthetic appearance of the bone conduction headset 10, the wires are not exposed outside the earhook housing 31, but are inserted into the earhook housing 31 such that at least the bent transition portion 312 covers the wires. However, since the wire is generally soft in texture, it is difficult to thread the wire into the earhook housing 31. Therefore, in the present embodiment, as shown in fig. 2 to fig. 5, the ear-hook housing 31 is at least provided with a first groove 315 on the bending transition portion 312, and the first groove 315 can be used for routing, so as to reduce the difficulty of threading a wire in the ear-hook housing 31. The first groove 315 can be disposed on a side of the earhook housing 31 close to the decorative bracket 321. At this time, the decoration element 32 may be embedded and fixed in the first groove 315 corresponding to the bending transition portion 312 to form a routing channel (not labeled in fig. 2 and 4), so as to allow the wires to extend from the inside of the movement module 20 to the accommodating chamber 313 through the routing channel, thereby facilitating the wires to connect the movement module 20 with the main control circuit board 50 and the battery 60. So configured, when the wire is inserted into the ear-hang shell 31 through the first groove 315, the decoration 32 can cover the wire to prevent the wire from being exposed outside the ear-hang shell 31. At this time, the decoration 32 not only can decorate the ear-hang case 31 but also can shield the wire, so that the decoration 32 can realize "one-piece dual-purpose".

As shown in fig. 2, the garnish 32 may include a garnish bracket 321 and a garnish strip 322. The decorative bracket 321 and the bending transition portion 312 are disposed in a bending manner, so that when the decorative bracket 321 is embedded in and fixed to the first groove 315 corresponding to the bending transition portion 312, the decorative bracket 321 and the first groove 315 on the bending transition portion 312 cooperate to form a routing channel, so as to allow the wires to extend from the inside of the core module 20 to the inside of the accommodating chamber 313 through the routing channel. Further, the decorative strip 322 is embedded in the first groove 315 and is attached and fixed with the decorative bracket 312. In this case, the decorative bracket 321 may be made of plastic, and may be assembled with the ear-hook housing 31 by gluing and/or clipping. The decorative strip 322 may be a sticker and may be attached to the decorative bracket 312 by gluing. With this arrangement, when the user wants to change the decorative effect of the garnish 32, the user can replace the garnish 322 without detaching the entirety of the garnish 32 from the ear hook housing 31. Of course, in some other embodiments, as shown in fig. 6, the decorative bracket 321 may further have a second groove 3211 on a side facing the ear-hook housing 31, so that when the decorative bracket 321 is embedded and fixed in the first groove 315, the second groove 3211 and the first groove 315 cooperate with each other to form a routing channel.

Further, the bottom of the first groove 315 may be provided with a recess 316 at a position near the end of the decorative strip 322 to allow a user to lift the end of the decorative strip 322 from the first groove 315 by pressing the decorative strip 322 into the recess 316 to facilitate replacement of the decorative strip 322. At this time, the first groove 315 may further extend to the accommodating chamber 313, and the recess 316 may be disposed on the accommodating chamber 313. The concave pit 316 is located outside the covering area of the decorative bracket 321 to the first groove 315, and the decorative strip 322 is attached and fixed on the decorative bracket 321 and covers the concave pit 316. At this time, the entire length of the decorative strip 322 may be greater than that of the decorative bracket 321.

It should be noted that: the decorative bracket 321 and the decorative strip 322 may be an integrally formed structural member. The material of the decorative bracket 321 and the material of the decorative strip 322 may be different, and the two materials may be molded by two-color injection molding, so that the decorative bracket 321 may have a supporting function, and the decorative strip 322 may have a decorative function. At this time, the entire length of the decorative strip 322 may be greater than or equal to the entire length of the decorative bracket 321.

As shown in fig. 3, the first groove 315 may be divided into a first sub-groove segment 3151 on the bending transition portion 312, a second sub-groove segment 3152 on the earphone fixing portion 311, and a third sub-groove segment 3153 on the accommodating chamber 313. The depth of the first sub-groove segment 3151 is greater than the depths of the second sub-groove segment 3152 and the third sub-groove segment 3153, so that the first sub-groove segment 3151 is mainly used for accommodating the decorative bracket 321 and realizing routing, and the second sub-groove segment 3152 and the third sub-groove segment 3153 are mainly used for accommodating the decorative strip 322. In other words, the trim strip 322, in addition to being located within the first subslot segment 3151, may further extend into the second subslot segment 3152 and the third subslot segment 3153. At this time, the pit 316 may be disposed at the third sub-groove segment 3153. Further, the depth of the second sub-groove segment 3152 may be equal to the depth of the third sub-groove segment 3153, and after the decorative bracket 321 is embedded and fixed in the first sub-groove segment 3151, a surface of the decorative bracket 321 facing away from the ear hook housing 31 may be substantially flush with the groove bottoms of the second sub-groove segment 3152 and the third sub-groove segment 3153, so that the decorative strip 322 can be flatly attached to the earphone fixing portion 311, the decorative bracket 321, and the accommodating chamber 313.

Further, the fitting strength between the decorative strip 322 and the decorative bracket 321 may be smaller than the fixing strength between the decorative bracket 321 and the bent transition portion 312. When the decoration strip 322 is glued to the decoration bracket 321, the gluing strength can be the gluing strength between the two. At this time, the magnitude of the fitting strength may be mainly determined by the roughness of the surface where the decorative bracket 321 is fitted to the decorative strip 322; and/or the amount of glue (and/or adhesion) between the trim strip 322 and the trim bracket 321. Further, when the decorative bracket 321 is engaged with the bent transition portion 312, the fixing strength may refer to an engagement strength therebetween. At this time, the fixing strength may be mainly determined by the fitting gap between the decorative bracket 321 and the bending transition portion 312; and/or the depth of the two snap fits. So set up, when decorating support 321 and ear-hang shell 31 mainly are the equipment of joint mode, the both ends of ornamental strip 322 can splice with holding storehouse 313 and earphone fixed part 311 respectively, can play the effect of further fixed decorating support 321, and when changing ornamental strip 322 in order to change the decorative effect of ornamental piece 32, decorate support 321 and also can not be because the laminating intensity between ornamental strip 322 is too big and be taken up.

It should be noted that: while the receiving chamber 313 shown in fig. 2 is mainly used for receiving the main control circuit board 50, the receiving chamber 313 shown in fig. 4 may be mainly used for receiving the battery 60. At this time, if the ear hook assembly 30 shown in fig. 2 corresponds to the left ear hook of the bone conduction headset 10, the ear hook assembly 30 shown in fig. 4 may correspond to the right ear hook of the bone conduction headset 10; conversely, if the ear hook assembly 30 shown in fig. 2 corresponds to a right ear hook of the bone conduction headset 10, the ear hook assembly 30 shown in fig. 4 may correspond to a left ear hook of the bone conduction headset 10. In other words, the main control circuit board 50 and the battery 60 may be disposed within the two ear hook assemblies 30, respectively. So configured, not only the capacity of the battery 60 may be increased to improve the endurance of the bone conduction headset 10; the weight of the bone conduction headset 10 may also be balanced to improve the wearing comfort of the bone conduction headset 10. At this time, the main control circuit board 50 and the battery 60 may be connected via a wire built in the rear cover assembly 40, and a detailed structure will be described later.

As shown in fig. 4, the ear hook assembly 30 can further comprise a button 36, and the ear hook housing 31 can further define a button fitting hole 317. The decorative bracket 321 is assembled and fixed on one side of the ear-hook shell 31, and the key 36 is arranged on the other side of the ear-hook shell 31 departing from the decorative bracket 321 and is exposed through the key adapting hole 317; the decorative bracket 321 further extends in a cantilever fashion above the key 36 exposed through the key fitting hole 317 and is capable of depressing the trigger key 36 under an external force. So configured, the key 36 can replace the control key 33 to simplify the structure of the bone conduction earphone 10; may also coexist with the control keys 33 described above and may be used to implement play/pause, AI wake-up, etc. functions to extend the interactive capabilities of the bone conduction headset 10.

Further, the key fitting hole 317 may be opened in the earphone fixing portion 311, so that the user can press the key 36 in the earphone fixing portion 311. At this time, the ear hook assembly 30 may further include a sealing member 37, and the sealing member 37 is disposed between the button 36 and the earphone fixing portion 311. The material of the sealing member 37 may be, but is not limited to, silicone, rubber, etc. With this arrangement, the waterproof performance of the headphone fixing portion 311 in the area where the key 36 is located can be increased, and the tactile sensation of pressing the key 36 can be improved.

Similarly, when the core module 20 is disposed at one end of the ear hook assembly 30 (specifically, the end where the earphone fixing portion 311 is located), and the battery 60 is disposed at the other end of the ear hook assembly 30 (specifically, the other end where the accommodating chamber 313 is located), the conducting wire at least passes through the region where the bending transition portion 312 is located, so that the core module 20 is connected to the battery 60 through the conducting wire. Therefore, as shown in fig. 4, the ear-hook housing 31 is at least provided with a first groove 315 at one side of the earphone fixing portion 311 and the bending transition portion 312 close to the decorative bracket 321, and the first groove 315 can be used for wiring to reduce the difficulty of threading a wire in the ear-hook housing 31. Further, one end of the first groove 315 is communicated with the key fitting hole 317, so that when the decorative bracket 321 is embedded and fixed in the first groove 315, the decorative bracket 321 can also cover the key fitting hole 317 to facilitate triggering the key 36.

In the above manner, the decoration 32 not only can decorate the ear hanging shell 31 and shield the wires, but also can shield and trigger the key 36, so that the decoration 32 can realize 'one-piece four-use'.

As shown in fig. 5, the first groove 315 may be divided into a first sub groove segment 3151 on the bending transition portion 312 and a second sub groove segment 3152 on the earphone fixing portion 311. The depth of the first sub-groove segment 3151 is greater than the depth of the second sub-groove segment 3152, so that the first sub-groove segment 3151 is mainly used for routing, and the second sub-groove segment 3152 and the first sub-groove segment 3151 are used for accommodating the decorative bracket 321. At this time, the key adapting hole 317 may be disposed on the second sub-groove segment 3152, that is, the projections of the two on the earphone fixing portion 311 at least partially overlap. Further, the first groove 315 may be further divided into a third sub-groove segment 3153 located on the accommodating chamber 313, and the third sub-groove segment 3153 may be further provided with a pit 316. Wherein the depth of the second sub-channel segment 3152 may be greater than the depth of the third sub-channel segment 3153, such that the third sub-channel segment 3153 is primarily for accommodating the decorative strip 322. In other words, the trim strip 322, in addition to being located within the first sub-channel segment 3151 and the second sub-channel segment 3152, may further extend into the third sub-channel segment 3153. At this time, after the decorative bracket 321 is embedded and fixed in the first sub-groove segment 3151, one surface of the decorative bracket 321 facing away from the ear-hook shell 31 may be substantially flush with the groove bottom of the third sub-groove segment 3153, so that the decorative strip 322 can be flatly attached to the earphone fixing portion 311, the decorative bracket 321 and the accommodating chamber 313; and the decorative bracket 321 may be cantilevered at the second sub-groove segment 3152 corresponding to the key fitting hole 317.

As shown in fig. 6, the decorative bracket 321 may include a securing portion 3212 corresponding to the first sub groove segment 3151 and a pressing portion 3213 corresponding to the second sub groove segment 3152. The thickness of the fixing portion 3212 is greater than that of the pressing portion 3213, so that the fixing portion 3212 is mainly used for assembling the decorative bracket 321 with the ear shell 31, and the pressing portion 3213 is mainly used for triggering the button 36. Further, when the decorative bracket 321 is opened with a second groove 3211 at a side facing the ear hook housing 31, the second groove 3211 may be disposed on the fixing portion 3212.

As shown in fig. 6 and 7, the decorative bracket 321 may further include a connecting portion 3214 connected between the fixing portion 3212 and the pressing portion 3213. The connecting portion 3214 is bent and extended toward a side away from the ear shell 31 relative to the fixing portion 3212, and the pressing portion 3213 is bent and extended toward a side closer to the ear shell 31 relative to the connecting portion 3214. At this time, the connection portion 3214 suspends the pressing portion 3213 with respect to the fixing portion 3212, and a certain distance is formed between the pressing portion 3213 and the fixing portion 3212. Wherein the distance may be greater than or equal to the activation stroke of the key 36. With such an arrangement, when a user presses one end of the decorative bracket 321 (specifically, the end where the pressing portion 3213 is located), the other end of the decorative bracket 321 tilts up.

Further, a pressing portion 3213 near the ear hanging shell 31 may further include a button protrusion 3215, so that when the pressing portion 3213 is pressed by an external force, the button protrusion 3215 can trigger the button 36. The projections of the key protrusions 3215 and the keys 36 on the earphone fixing portion 311 are at least partially overlapped, and an effective area of the key protrusions 3215 in contact with the keys 36 is smaller than an effective area of the pressing portion 3213 in contact with the keys 36. With the arrangement, the triggering difficulty of the key 36 can be reduced; especially when the sealing member 37 is provided between the push button 36 and the earphone fixing portion 311, the sealing member 37 is required to be deformed first because the push button 36 is activated. Based on the relational expression F ∞ S, when the external force F applied by the user is the same, the effective area S of the region where the seal 37 needs to be deformed is smaller, so that the deformation of the seal 37 is larger, and the key 36 is more easily activated. Obviously, the key protrusions 3215 can reduce the effective area compared to the pressing portion 3213.

Further, the decorative bracket 321 may further include a stopper portion 3216 at an end portion close to the earphone fixing portion 311. The stopping portion 3216 is configured to form a stop with an inner surface of the earphone fixing portion 311 away from the decorative bracket 321, so as to prevent an end of the decorative bracket 321 from tilting from the first groove 315, especially under an external force. As shown in fig. 7, a stopping portion 3216 may be specifically disposed at an end of the pressing portion 3213 away from the fixing portion 3212. At this time, due to the stopping function between the stopping portion 3216 and the earphone fixing portion 311, after the decorative bracket 321 is deformed by external pressure to trigger the button 36, the decorative bracket 321 will not be tilted due to excessive elastic recovery.

Referring to fig. 2 or fig. 6 again, one end of the decorative bracket 321 close to the accommodating chamber 313 (i.e. the other end thereof far from the pressing portion 3213) may further be provided with a bridging portion 3217. The thickness of the bridging portion 3217 is smaller than that of the fixing portion 3212, so as to avoid the reinforcing structure (specifically, located between the bending transition portion 312 and the accommodating chamber 313) of the ear hanging shell 21.

As shown in fig. 8, the movement module 20 may include a movement case 21 and a movement 22. Wherein, one end of the movement housing 21 is open, and the ear-hang housing 31 (specifically, the earphone fixing part 311) is covered on the open end of the movement housing 21 to form a cavity structure for accommodating the movement 22. In this case, the ear hook case 31 corresponds to a cover of the movement case 21. With such an arrangement, compared with the insertion assembly manner of the ear-hook structure and the core structure in the related art, the assembly manner of the ear-hook housing 31 and the core housing 21 in the embodiment of the present application can improve the stress problem of the ear-hook structure and the core structure at the insertion position in the related art, thereby increasing the reliability of the bone conduction earphone 10.

It should be noted that: fig. 8 illustrates the ear hook housing, mainly for convenience of describing a relative position relationship between the ear hook housing and the movement housing, and further implicitly illustrates a possible assembly manner between the ear hook housing and the movement housing.

Further, the movement 22 may be directly or indirectly fixed in the movement housing 21, so that the movement 22 generates vibration under the excitation of the electrical signal and drives the movement housing 21 to vibrate therewith. When the bone conduction headset 10 is worn by a user, the skin contact area of the movement housing 21 (i.e., the bottom wall 211 described later) may contact the skin of the user, so that the above-mentioned vibration can be transmitted to the auditory nerve through the skull bone of the person, and the user can hear the sound played by the bone conduction headset 10. In this embodiment, the movement module 20 may further include a movement bracket 23, and the movement bracket 23 is used to fix the movement 22 in the movement housing 21.

In general, low frequency refers to sound with a frequency less than 500Hz, medium frequency refers to sound with a frequency range within 500-4000Hz, and high frequency refers to sound with a frequency greater than 4000 Hz. Further, as shown in fig. 9, the horizontal axis is the frequency of vibration (in Hz) and the vertical axis is the intensity of vibration (in dB); the high frequency region (range of frequencies greater than 4000 Hz) has a first high frequency trough V, a first high frequency peak P1 and a second high frequency peak P2. Here, the first high-frequency valley V and the first high-frequency peak P1 may be generated by deformation of a non-skin contact area (i.e., an annular peripheral wall 212 described later) of the movement case 21 at a high frequency, and the second high-frequency peak P2 may be generated by deformation of a skin contact area of the movement case 21 at a high frequency. In general, the frequency response curve in the frequency range of 500-. Wherein sharp peaks and valleys are undesirable in this frequency range; the flatter the frequency response curve, the better the sound quality of the bone conduction headset. Generally, the larger the rigidity is, the smaller the deformation generated when the structure is stressed is, and the higher-frequency resonance is also generated. Therefore, the product manufacturer may move the first high-frequency valley V, the first high-frequency peak P1, and the second high-frequency peak P2 to a higher-frequency region by increasing the rigidity of the deck case 21 in most cases. In other words, in order to obtain better sound quality, the rigidity of the deck case 21 may be as large as possible. For this reason, in the embodiment of the present application, the material of the movement housing 21 may be, but is not limited to, a mixture of a material such as polycarbonate, polyamide, acrylonitrile-butadiene-styrene copolymer, and glass fiber or carbon fiber. In some embodiments, the material of the movement housing 21 may be carbon fiber and polycarbonate mixed according to a certain ratio, or glass fiber and polyamide mixed according to a certain ratio. In other embodiments, the material of the movement housing 21 may be carbon fiber, glass fiber and polycarbonate mixed according to a certain ratio. Wherein, carbon fiber and/or glass fiber with different proportions are added, the elastic modulus of the materials is different, and the rigidity of the prepared movement shell 21 is also different. For example, 20% -50% of glass fiber is added into polycarbonate, and the elastic modulus of the material can reach 6-8 GPa.

Based on the above detailed description, on the one hand, the ear-hook housing 31 (especially, the earphone fixing portion 311) is a part of the structure of the movement module 20 to form a cavity structure for accommodating the movement 22; on the other hand, in the embodiment of the present application, in order to improve the wearing comfort of the bone conduction earphone 10, the earhook housing 31 is generally made of a softer material, so that the earhook housing 31 has a smaller rigidity. With such an arrangement, when the ear hook housing 31 is covered on the movement housing 21 to form a cavity structure for accommodating the movement 22, since the rigidity of the ear hook housing 31 (especially the earphone fixing portion 311) is less than that of the movement housing 21, the bone conduction earphone is prone to a bad phenomenon of sound leakage, and then the user's good feeling is affected.

Generally, the resonant frequency of a structure is related to the stiffness of the structure; and under the same mass, the higher the rigidity of the structure is, the higher the resonant frequency is. The rigidity K of the structure is related to the material (specifically, the elastic modulus), the specific structural form and other factors. Generally, the greater the elastic modulus E of a material, the greater the stiffness K of the structure; the larger the thickness t of the structure is, the larger the rigidity K of the structure is; the smaller the area S of the structure, the greater the stiffness K of the structure. In this case, the above relationship can be described simply by the relational expression K ∈ (E · t)/S. Therefore, the rigidity K of the structure can be increased by one or a combination of the modes of increasing the elastic modulus E of the material, increasing the thickness t of the structure, reducing the area S of the structure and the like, and further the resonant frequency of the structure can be increased.

In the embodiment of the present application, the ear shell 31 is generally made of a relatively soft material (i.e., a material with a relatively small elastic modulus, such as polycarbonate, polyamide, etc., and the elastic modulus thereof is usually 2-3GPa), and the movement shell 21 is generally made of a relatively hard material (i.e., a material with a relatively large elastic modulus, such as 20% -50% glass fiber added to polycarbonate, and the elastic modulus thereof can reach 6-8 GPa). Obviously, the rigidity of the ear hook housing 31 is not consistent with the rigidity of the movement housing 21 due to the difference in the elastic modulus, and the above-described sound leakage is likely to occur. In addition, after the ear hook housing 31 is connected to the movement housing 21, the structure is likely to resonate at a relatively low frequency due to the inconsistency in the rigidity of the two. For this reason, in the present embodiment, when the elastic modulus of the movement case 21 is larger than that of the ear hook case 31, the earphone fixing portion 311 is provided with the reinforcing structure 318, and the ratio of the difference between the rigidity K1 of the skin contact area of the movement case 21 and the rigidity K2 of the earphone fixing portion 311 to the rigidity K1 of the skin contact area of the movement case 21 may be made less than or equal to 10%. That is, (K1-K2)/K1 is not more than 10%, or K2/K1 is not less than 90%. With this arrangement, it is possible to ensure that the movement housing 21 has sufficient rigidity so that the resonance frequency thereof is located in a high frequency region as high as possible, and also to reduce the difference in rigidity between the earphone fixing portion 311 and the movement housing 21 to increase the resonance frequency of the structure, and to improve the above-described sound leakage.

In some embodiments, as shown in fig. 10, the cartridge housing 21 may include a bottom wall 211 and an annular peripheral wall 212. The bottom wall 211 is a skin contact area of the movement housing 21, and one end of the annular peripheral wall 212 is integrally connected to the bottom wall 211. In other words, the bottom wall 211 is intended to be in contact with the skin of the user. Further, the earphone fixing portion 311 may include a fixing body 3111 connected to the bent transition portion 312 and an annular flange 3112 integrally connected to the fixing body 3111 and extending toward the movement housing 21. The annular flange 3112 and the other end of the annular peripheral wall 212 away from the bottom wall 211 are butted against each other, and the two can be connected by gluing or a combination of gluing and clamping.

It should be noted that: in the embodiment of the present application, the bottom wall 211 may have any one of a rectangular shape, a square shape, a circular shape, an oval shape, an ellipse-like shape (similar to the shape of the earphone fixing portion 311 shown in fig. 11), and the like. Further, the annular peripheral wall 212 may be perpendicular to the bottom wall 211, that is, the area of the opening end of the movement housing 21 is equal to the area of the bottom wall 211; the annular peripheral wall 212 may be inclined outward at an angle (for example, an inclination angle of 30 ° or less) with respect to the bottom wall 211, that is, the area of the opening end of the movement housing 21 is larger than the area of the bottom wall 211. In the present embodiment, the bottom wall 211 is in an ellipse-like shape, and the annular peripheral wall 212 is inclined outward by 10 ° with respect to the bottom wall 211. So set up, under the prerequisite of guaranteeing certain wearing comfort (because diapire 211 can contact with user's skin as the skin contact area of core casing 21, its area is difficult too little), reduce the area of diapire 211, can increase core casing 21's resonant frequency.

As shown in fig. 10 (a), the reinforcing structure 318 may be an arc-shaped structure provided between the fixed body 3111 and the annular flange 3112, that is, a chamfering (filler) process is performed. Further, since the size of the annular flange 3112 in the thickness direction of the earphone fixing portion 311 is generally small, the annular flange 3112 can be integrated with the above-described arc-shaped structure. At this time, the earphone fixing portion 311 may have a structure including only the fixing body 3111 and the reinforcing structure 318 having an arc structure. With such an arrangement, the effective area of the earphone fixing portion 311 is reduced by the arc structure, so that the rigidity of the earphone fixing portion 311 can be increased, and the rigidity difference between the earphone fixing portion 311 and the movement housing 21 is further reduced. It should be noted that: the size of the arc-shaped structure can be reasonably designed according to the rigidity requirement of the earphone fixing portion 311, and is not limited herein.

As shown in fig. 10 (b), the reinforcing structure 318 may be a thickening layer provided integrally with the fixed body 3111, that is, a thickening (thick) treatment may be performed. The material of the thickening layer may be the same as that of the ear-hook case 31, and for example, the material of the thickening layer may be any one of polycarbonate, polyamide, and acrylonitrile-butadiene-styrene copolymer. It should be noted that: the reinforcing structure 318 may be located on one side of the fixed body 3111 close to the movement housing 21, on the other side of the fixed body 3111 away from the movement housing 21, or on both sides of the fixed body 3111. Further, since the size of the annular flange 3112 in the thickness direction of the earphone fixing portion 311 is generally small, the annular flange 3112 can be integrated with the above-described thickening layer. At this time, the earphone fixing portion 311 may include only the fixing body 3111 and the reinforcing structure 318 provided with a thickening layer. With such an arrangement, the thickness of the earphone fixing portion 311 is increased by the thickening layer, so that the rigidity of the earphone fixing portion 311 can be increased, and the difference in rigidity between the earphone fixing portion 311 and the movement housing 21 can be reduced. It should be noted that: the size of the thickening layer may be reasonably designed according to the rigidity requirement of the earphone fixing portion 311, and is not limited herein.

In other embodiments, the reinforcing structure 318 may be a metal part. The metal product may be, but not limited to, aluminum alloy, magnesium alloy, titanium alloy, nickel alloy, chrome molybdenum steel, stainless steel, etc. In this case, the reinforcing structure 318 and the earphone fixing portion 311 may be integrally formed by insert molding. With such an arrangement, the metal part can effectively increase the rigidity of the earphone fixing portion 311, thereby reducing the rigidity difference between the earphone fixing portion 311 and the movement housing 21. It should be noted that: the material, size, and other parameters of the metal part may be reasonably designed according to the stiffness requirement of the earphone fixing portion 311, which is not limited herein.

In other embodiments, as shown in fig. 11, the reinforcing structure 318 may be a reinforcing rib provided on the earphone fixing portion 311. The above-mentioned reinforcing ribs are mainly distributed on the side of the earphone fixing portion 311 close to the movement housing 21. Further, the number of the reinforcing ribs may be plural, and the plural reinforcing ribs may be arranged in parallel as shown in fig. 11 (a) and (b) or in a grid as shown in fig. 11 (c); the plurality of ribs may be radially arranged around a predetermined reference point on the earphone fixing portion 311 as shown in fig. 11 (d). The material of the reinforcing rib may be the same as that of the ear-hook housing 31, and for example, the material of the reinforcing rib may be any one of polycarbonate, polyamide, and acrylonitrile-butadiene-styrene copolymer. In this way, compared with the way of injection molding the metal part on the earphone fixing portion 311 or directly performing the thickening process on the earphone fixing portion 311, the way of providing the reinforcing rib on the earphone fixing portion 311 can increase the rigidity of the earphone fixing portion 311 and also can take into account the weight of the earphone fixing portion 311.

Further, as shown in fig. 11, the earphone fixing portion 311 may have a long axis direction (a direction shown by a chain line X in fig. 11) and a short axis direction (a direction shown by a chain line Y in fig. 11). The size of the earphone fixing portion 311 in the major axis direction may be larger than the size thereof in the minor axis direction. The following is an exemplary description of the distribution of the reinforcing bars:

as shown in fig. 11 (a), the plurality of reinforcing ribs may extend in a strip-like manner in the major axis direction and be arranged side by side in the minor axis direction. At this time, the reinforcing structure 318 can be simply regarded as a Long-Side reinforcement (Long-Side) of the headphone fixing portion 311.

As shown in fig. 11 (b), the plurality of reinforcing ribs may extend in a strip-like manner in the short axis direction and be arranged side by side in the long axis direction. At this time, the reinforcement structure 318 can be simply regarded as a Short-Side reinforcement (Short-Side) of the earphone fixing portion 311.

As shown in fig. 11 (c), a plurality of ribs may be arranged in the major axis direction and the minor axis direction, respectively, to form a grid shape. At this time, the reinforcing structure 318 can be simply regarded as a Cross reinforcement (Cross) of the earphone fixing portion 311.

As shown in fig. 11 (d), one ends of the plurality of reinforcing ribs, which are close to each other, may be disposed at intervals, and extension lines of the plurality of reinforcing ribs may intersect a preset reference point (shown as a solid point O in fig. 11). In this case, the reinforcing structure 318 can be simply regarded as a radiation rib (radial) of the earphone fixing portion 311.

The inventors of the present application have found, through long-term research: under the same condition, when the following dimensional relationship is satisfied between the reinforcing rib and the earphone fixing portion 311, it is possible to effectively increase the rigidity of the earphone fixing portion 311 and to well consider the weight of the earphone fixing portion 311. Specifically, the ratio between the thickness of the reinforcing ribs and the thickness of the earphone fixing portion 311 may be within a closed interval [0.8, 1.2], the ratio between the width of the reinforcing ribs and the thickness of the earphone fixing portion 311 may be within a closed interval [0.4, 0.6], and the ratio between the pitch of the reinforcing ribs and the thickness of the earphone fixing portion 311 may be within a closed interval [1.6, 2.4 ]. Preferably, the thickness of the rib may be the same as that of the earphone fixing part 311, the width of the rib may be half of that of the earphone fixing part 311, and the interval of the rib may be twice of that of the earphone fixing part 311. Here, the thickness of the earphone fixing portion 311 is 0.8mm, and the thickness, width and pitch of the reinforcing ribs are 0.8mm, 0.4mm and 1.6mm, respectively, for the exemplary explanation of the present embodiment.

It should be noted that: the various reinforcing structures shown in fig. 10 and 11 can be combined reasonably according to the rigidity requirement of the earphone fixing portion 311, and are not limited herein.

As shown in fig. 12, the curve (a + B) may indicate that the material of the earphone fixing portion 311 is different from the material of the movement housing 21 (for example, the elastic modulus of the former is smaller than that of the latter), and the earphone fixing portion 311 is not modified in structure; the curve (B + B) may indicate that the material of the earphone fixing portion 311 is the same as that of the movement housing 21 (for example, the elastic modulus of the both is equal), and the earphone fixing portion 311 is similar to the movement housing 21 in structure (for example, the thickness of the both is equal, and the area of the earphone fixing portion 311 is also equal to that of the bottom wall 211). Wherein, a may correspond to the earphone fixing portion 311, and B may correspond to the bottom wall 211 (i.e., the skin contact area of the movement housing 21); the (a + B) and (B + B) may be covered on the movement housing 21 corresponding to the ear-hook housing 31 (specifically, the earphone fixing portion 311).

From fig. 12, it can be unambiguously concluded that: for structure (a + B), its resonant valley (which may correspond to the first high-frequency valley V described above) occurs at a frequency of about 5500 Hz; whereas for structure (B + B) its resonance valley (which may correspond to the first high frequency valley V described above) occurs at a frequency of about 8400 Hz. Obviously, if the structure (a + B) is modified to the structure (B + B), the resonance frequency of the structure can be effectively increased.

Further, with the configuration (a + B), after the earphone fixing portion 311 is provided with the reinforcing structures 318 such as the chamfer (filler) shown in fig. 10 (a), the thickening (thick) shown in fig. 10 (B), the Long-Side rib (Long-Side) shown in fig. 11 (a), the Short-Side rib (Short-Side) shown in fig. 11 (B), the Cross rib (Cross) shown in fig. 11 (c), and the radiation rib (radial) shown in fig. 11 (d), the resonance valley of the (a + B + reinforcing structure) occurs in the frequency range 5500 and 8400 Hz. In other words, the reinforcing structure 318 provided on the earphone fixing portion 311 does contribute to increase the resonant frequency of the structure, that is, contributes to reduce the difference in rigidity between the earphone fixing portion 311 and the movement housing 21, thereby contributing to improve the above-mentioned sound leakage. It should be noted that: the reinforcing structure 318 has a different structure, and the effect of increasing the resonant frequency, that is, the degree of improvement of the leakage sound, is different. If the increasing effect of the reinforcing structure 318 on the resonant frequency is ranked from excellent to relatively excellent, the sequence is: the cross adds muscle > minor face adds muscle > radiation adds muscle > thickening > long limit adds muscle > chamfer.

Based on the above detailed description, the movement 22 generates vibration under the excitation of the electrical signal, and drives the movement housing 21 to vibrate therewith; so that when the bone conduction earphone 10 is worn by the user, the bottom wall 211 (i.e., the skin contact area) of the movement housing 21 can contact with the skin of the user, so that the above-mentioned vibration can be transmitted to the auditory nerve through the skull bone of the person, and the user can hear the sound played by the bone conduction earphone 10. At this time, in order to ensure reliability of the transmission process of the vibration, it is at least necessary that the movement case 21 can vibrate along with the movement 22. Therefore, the movement 22 needs to be fixed in the movement case 21.

As shown in fig. 13 and 8, one end of the movement case 21 is open, and the movement holder 23 and the movement 22 are accommodated in the movement case 21. The movement bracket 23 is used to fix the movement 22 in the movement housing 21. Further, as shown in fig. 14, the movement holder 23 may include an annular holder main body 231 and a stopper structure provided on the holder main body 231. The movement 22 is hung on the bracket main body 231 to be fixedly connected with the movement housing 21. As shown in fig. 13, the stopper structure and the movement housing 21 may be in interference fit, so that the movement bracket 23 is held relatively fixed with respect to the movement housing 21 in the circumferential direction of the bracket main body 231 (the direction indicated by the arrow C in fig. 14). The plane where the bracket main body 231 is located may be parallel to the plane where the bottom wall 211 is located, so as to increase the degree of adhesion between the two, and further increase the transmission effect of the vibration. At this time, a glue body (not shown in fig. 13) such as a structural glue, a hot melt glue, an instant glue, etc., may be further disposed between the holder main body 231 and the bottom wall 211. So set up, can assemble through the mode of joint and the combination of gluing between core support 23 and the core casing 21, and then can restrict the degree of freedom between core support 23 and the core casing 21 effectively. Of course, in other embodiments, the movement bracket 23 and the movement housing 21 may be fixed directly by gluing. For example: a glue body (not shown in fig. 13) such as a structural glue, a hot melt glue, an instant glue, etc., is provided between the holder main body 231 and the bottom wall 211, and the degree of freedom between the movement holder 23 and the movement housing 21 can be effectively restricted as well; the structure of the deck case 21 can also be simplified.

As shown in fig. 13, the movement housing 21 may further include a positioning column 213 connected to the bottom wall 211 or the annular peripheral wall 212. As shown in fig. 14, the spacing structure may include a first spacing structure 232. Wherein, the first limiting structure 232 is provided with an insertion hole 233. Further, the positioning column 213 is inserted into the insertion hole 233. So set up, can increase the precision of equipment between core support 23 and core casing 21 effectively. In this case, the colloid may be provided between the holder main body 231 and the bottom wall 211.

Further, as shown in fig. 14, the limiting structure may further include a second limiting structure 234. The second stopper 234 is spaced apart from the first stopper 232 in the circumferential direction of the holder main body 231 (the direction indicated by the arrow C in fig. 14). The second stopper 234 can abut against the annular peripheral wall 212, and will be described in detail later. So set up, second limit structure 234 and first limit structure 232 respectively with the core casing 21 on the structure cooperation that corresponds for core support 23 keeps relatively fixed with core casing 21, just promptly restricts the degree of freedom between core support 23 and the core casing 21 effectively.

As shown in fig. 8, the open end of the annular peripheral wall 212 has a major axis direction (the direction shown by the chain line X in fig. 8) and a minor axis direction (the direction shown by the chain line Y in fig. 8). Wherein the dimension of the open end of the annular peripheral wall 212 in the major axis direction may be larger than the dimension in the minor axis direction. Further, as shown in fig. 15, the first limit structures 232 and the second limit structures 234 are disposed at intervals on opposite sides of the holder main body 231 in the long axis direction, and projections of the first limit structures 232 and the second limit structures 234 on a reference plane (a plane indicated by a dotted-line rectangular frame in fig. 15) where the open end of the annular peripheral wall 212 is located are at least partially located outside a projection of the holder main body 231 on the reference plane. This arrangement is such that the first position-limiting structure 232 is engaged with the positioning post 213 and the second position-limiting structure 234 is engaged with the annular wall 212.

As shown in fig. 14, the first limiting structure 232 may include a first axial extension 2321 and a first radial extension 2322. The first axial extension 2321 is connected to the holder main body 231 and extends toward the side of the movement 22 along the axial direction of the holder main body 231 (the direction indicated by the dashed line Z in fig. 14); the first radial extension 2322 is connected to the first axial extension 2321 and extends outward of the holder main body 231 in the radial direction of the holder main body 231 (i.e., the direction in which the diameter of the holder main body 231 is located). At this time, the insertion hole 233 is disposed on the first radial extension 2322, as shown in fig. 13 to 15, so that the first limiting structure 232 is engaged with the positioning pillar 213. Further, as shown in fig. 14, the second limiting structure 234 may include a second axial extension 2341 and a second radial extension 2342. The second axial extension 2341 is connected to the bracket main body 231 and extends to the side of the movement 22 along the axial direction of the bracket main body 231; the second radially extending portion 2342 is connected to the second axially extending portion 2341 and extends radially outward of the holder main body 231 in the radial direction of the holder main body 231. At this time, the second radial extension 2342 abuts against the annular peripheral wall 212, for example, as shown in fig. 13 and 15, the second limiting structure 234 is clamped to the annular peripheral wall 212. So configured, as shown in fig. 13, cartridge 22 is positioned between first axial extension 2321 and second axial extension 2341.

It should be noted that: as shown in fig. 13 to 15, with the movement 22 as a reference, if the region between the first axial extension 2321 and the second axial extension 2341 is the inner side of the holder main body 231, the region other than the inner side is the outer side of the holder main body 231.

Referring again to fig. 13, the annular peripheral wall 212 may further include an inclined region 214 corresponding to the first stopper 232 and disposed obliquely with respect to the bottom wall 211. Wherein, the positioning column 213 can be disposed on the inclined area 214. With such an arrangement, the effective distance between the first radial extension 2322 and the bottom wall 211 can be reduced, that is, the height of the positioning column 213 is reduced, so as to increase the structural strength of the positioning column 213 (especially the root portion thereof connected with the inclined region 214) on the movement housing 21, thereby avoiding the undesirable phenomena of fracture and falling off when the positioning column 213 falls off and collides with the bone conduction earphone 10.

Referring again to fig. 15, the number of the second position limiting structures 234 may be two spaced apart in the short axis direction. Wherein, the projection of the first position-limiting structure 232 on the reference plane and the projections of the two second position-limiting structures 234 on the reference plane are sequentially connected to form an acute triangle (as shown by the triangle with broken lines in fig. 15). In this case, the acute triangle may be an acute isosceles triangle or an equilateral triangle. The arrangement is such that the interaction points between the movement bracket 23 and the movement shell 21 are symmetrically arranged as much as possible, and the reliability of the assembly of the movement bracket 23 and the movement shell 21 is further improved.

Further, the outer contour of the holder main body 231 may be disposed in a circular shape, and the annular peripheral wall 212 may be disposed with two arc-shaped recessed regions 2121 opposite to each other in the short axis direction. Wherein, the outer contour of the holder main body 231 is embedded into the two arc-shaped recessed areas 2121 respectively. With this arrangement, the degree of freedom between the deck bracket 23 and the deck case 21 can be further restricted.

Based on the above detailed description, when the elastic modulus of the movement housing 21 is greater than that of the ear hook housing 31, the structure (a + B) is formed after the ear hook housing 31 is connected to the movement housing 21, and the resonance frequency of the structure (a + B) may be low due to the difference in rigidity (as shown by the curve (a + B) in fig. 16), and the above-described sound leakage is also likely to occur; after the structure (a + B) is modified to the structure (B + B), the resonant frequency of the structure can be effectively increased (as shown by the curve (B + B) in fig. 12). Based on this, the present embodiment improves the relevant structure of the movement module 20.

As shown in fig. 16, the engine module 20 may further include a cover plate 24. Wherein, one end of the movement shell 21 is opened, and the cover plate 24 is covered on the opened end of the movement shell 21 to form a cavity structure for accommodating the movement 22. In other words, the cover plate 24 covers the other end of the annular peripheral wall 212, which is away from the bottom wall 211, and is disposed opposite to the bottom wall 211. At this time, the cover plate 24 and the movement housing 21 can be connected by glue or a combination of clamping and glue. Further, the ear hook housing 31 is connected to the cover plate 24, and for example, the earphone fixing portion 311 covers a side of the cover plate 24 away from the movement housing 21 in a full-covering or half-covering manner. In the present embodiment, the earphone fixing portion 311 is exemplarily described as an example of fully covering the cover plate 24. At this time, the ear-hook housing 31 and the movement housing 21 can still be connected by gluing or a combination of clamping and gluing.

It should be noted that: fig. 16 illustrates the earhook housing, mainly for convenience of describing the relative position relationship between the earhook housing and the cover plate, and therefore implicitly illustrates one possible assembly manner between the earhook housing and the cover plate.

In this embodiment, the elastic modulus of the movement case 21 is larger than that of the ear-hook case 31, and the elastic modulus of the cover plate 24 is larger than that of the ear-hook case 31. At this time, in the present embodiment, the cover plate 24 is connected to the movement housing 21 instead of the earphone fixing portion 311, which helps to increase the rigidity of the structure (specifically, the cover plate 24 and the earphone fixing portion 311) located at the opening end of the movement housing 21, and further helps to reduce the difference between the rigidity of the bottom wall 211 of the movement housing 21 and the rigidity of the structure at the opening end thereof. With this arrangement, it is possible to ensure sufficient rigidity of the movement case 21 so that the resonance frequency thereof is located in a high frequency region as high as possible, and to contribute to an increase in the resonance frequency of the structure (movement case 21+ cover plate 24+ earphone fixing portion 311), and to improve the above-described sound leakage.

Further, the elastic modulus of the cover plate 24 may be smaller than or equal to that of the deck case 21. Preferably, the elastic modulus of the cover plate 24 is equal to that of the movement housing 21. At this time, the cover 24 may be formed into a structure (B + B) similar to that described above after being attached to the deck case 21. So arranged, the ratio of the difference between the rigidity K1 of the bottom wall 211 and the rigidity K3 of the lid plate 24 to the rigidity K1 of the bottom wall 211 may be made less than or equal to 10%. That is, (K1-K3)/K1 is not more than 10%, or K3/K1 is not less than 90%.

In some embodiments, the area of the bottom wall 211 is less than or equal to the area of the cover plate 24, and the thickness of the bottom wall 211 is less than or equal to the thickness of the cover plate 24. Based on the above detailed description, on the premise of ensuring certain wearing comfort, the area of the bottom wall 211 is reduced, and the resonance frequency of the movement housing 21 can be increased. Therefore, in the present embodiment, in order to ensure that the movement housing 21 has sufficient rigidity so that the resonance frequency thereof is located in a high frequency region as high as possible, the area of the bottom wall 211 is smaller than or equal to the area of the cover 24, that is, the area of the open end of the movement housing 21 is larger than the area of the bottom wall 211. Further, according to the above-mentioned relational expression K ∞ (E · t)/S, when the elastic modulus of the cover plate 24 is smaller than or equal to the elastic modulus of the movement case 21 and the area of the bottom wall 211 is smaller than or equal to the area of the cover plate 24, the thickness of the bottom wall 211 needs to be smaller than or equal to the thickness of the cover plate 24 in order to satisfy the above-mentioned relational expression (K1-K3)/K1 is smaller than or equal to 10%.

In other embodiments, the cover plate 24 may be made of the same material as the movement housing 21, for example, the cover plate 24 is made of a mixture of polycarbonate and glass fiber and/or carbon fiber. Further, according to the above-mentioned relational expression K ∞ (E.t)/S, in order to satisfy the above-mentioned relational expression K3/K1 ≥ 90%, it is necessary that the ratio between the thickness and the area of the lid plate 24 and the ratio between the thickness and the area of the bottom wall 211 be greater than or equal to 90%. Preferably, the ratio of the thickness to the area of the bottom wall 211 is equal to the ratio of the thickness to the area of the cover plate 24.

It should be noted that: according to the above relational expression K ∞ (E · t)/S, in order to satisfy the above relational expression (K1-K3)/K1 ≤ 10%, the structural parameters (e.g., thickness, area, and ratio) of the cover 24 and the movement case 21 may be designed based on the materials of the cover 24 and the movement case 21, or the materials of the cover 24 and the movement case 21 may be selected according to the structural parameters of the cover 24 and the movement case 21. The above-described embodiments therefore only show two possible embodiments by way of example.

Based on the above detailed description, after the cover plate 24 is connected to the movement housing 21 instead of the earphone fixing portion 311, the earphone fixing portion 311 still needs to be connected to the side of the cover plate 24 away from the movement housing 21, for example, the earphone fixing portion 311 covers the cover plate 24 completely.

In some embodiments, if the ear hook housing 31 and the cover plate 24 are both made of plastic and the elastic modulus of the former is smaller than that of the latter, the two can be formed as a unitary structure by two-shot molding. If the ear-hook housing 31 is made of plastic and the cover plate 24 is made of metal, and the elastic modulus of the former is smaller than that of the latter, the two can be formed into an integral structural member by metal insert molding. At this time, the ear hook case 31 and the cover plate 24 are connected to the movement case 21 as a whole. By the arrangement, the consistency of the ear-hook shell 31 and the cover plate 24 on vibration can be well ensured; but it will be difficult to arrange the aforementioned key, the later mentioned second microphone, etc. between the earhook housing 31 and the cover plate 24.

In some other embodiments, the earphone fixing portion 311 and the cover plate 24 are connected by gluing or a combination of clamping and gluing. At this time, the above-mentioned keys, the second microphone, and the like are further provided between the earhook housing 31 and the cover plate 24, and the specific structure will be described in detail later. Further, the filling degree of the glue (not shown in fig. 16) provided between the earphone fixing portion 311 and the cover plate 24 should be as large as possible, for example, the filling degree is greater than or equal to 90%. Because, when the filling degree of the colloid arranged between the earphone fixing portion 311 and the cover plate 24 is small, not only the connection strength between the earphone fixing portion 311 and the cover plate 24 is difficult to be ensured, but also the vibration of the earphone fixing portion 311 and the cover plate 24 may have a problem of large hysteresis, and air may be further mixed between the earphone fixing portion and the cover plate, so that the resonance frequency of the structure is adversely affected, that is, the above-mentioned beneficial effect of improving the structure (a + B) into the structure (B + B) is difficult to be ensured, and the structure may have a problem of noise in the vibration process.

In addition to this, the inventors of the present application found in long-term studies that: under the same condition, as shown in fig. 17, different types of glue (e.g., structural glue, hot melt glue, instant glue, silicone glue, etc.) disposed between the earphone fixing portion 311 and the cover plate 24 also have a great influence on the resonant frequency of the structure. Fig. 17 shows, without any doubt, that: different types of colloids do have an effect on the resonant frequency of the structure; if the beneficial effects of the above colloids on the resonant frequency are ranked from good to bad, the order is: structural adhesive > hot melt adhesive > instant adhesive > silica gel. It should be noted that: since the texture of silicone is generally softer, its beneficial effect on the resonant frequency of the structure is minimal. Therefore, if the resonance frequency of the structure is considered, it may be preferable to provide a gel having a greater hardness between the earphone fixing portion 311 and the cover plate 24.

Based on the above detailed description, on one hand, the movement bracket 23 may be used to fix the movement 22 in the movement housing 21, so as to increase the reliability of the movement 22 driving the movement housing 21 to vibrate; on the other hand, the cover 24 may be used to increase the rigidity of the structure (specifically, the cover 24 and the earphone fixing portion 311) located at the open end of the movement case 21 to reduce the difference between the rigidity of the bottom wall 211 of the movement case 21 and the rigidity of the structure at the open end thereof. Among them, as for the fitting between the deck holder 23 and the deck case 21 (particularly in the above-mentioned Z direction), it is possible to pass through the glue joint between the holder main body 231 and the bottom wall 211; and/or the engagement between the stop structure and the annular peripheral wall 212. Further, the present embodiment provides another inventive concept with respect to the fit between the deck bracket 23 and the deck case 21 (particularly in the Z direction described above) based on the cover plate 24.

As shown in fig. 18 and 19, the cover plate 24 is not only disposed on the opening end of the movement housing 21, but also disposed on the side of the cover plate 24 facing the movement housing 21 is a pressing structure. Wherein, the abutting structure is used for abutting and fixing the movement bracket 23 in the movement shell 21. With such an arrangement, the cover plate 24 can not only increase the rigidity of the structure (specifically, the cover plate 24 and the earphone fixing portion 311) located at the opening end of the movement housing 21, but also press the movement bracket 23 in the movement housing 21, thereby enabling the cover plate 24 to realize "one-piece dual-purpose".

As shown in fig. 19, the cap plate 24 may include a cap plate main body 241 and a pressing structure integrally connected with the cap plate main body 241. The abutting structure may include a first abutting pillar 242 and a second abutting pillar 243, and the first abutting pillar 242 and the second abutting pillar 243 are disposed at intervals along the circumferential direction of the cover plate main body 241 and abut against the movement bracket 23. Further, the plane of the cover plate main body 214 may be parallel to the plane of the bottom wall 211, so that the plane of the cover plate main body 214 may be parallel to the plane of the bracket main body 231, and further, the extending directions of the first abutting column 242 and the second abutting column 243 may be perpendicular to the plane of the bracket main body 231, that is, the extending directions of the first abutting column 242 and the second abutting column 243 may be parallel to the Z direction. With this arrangement, the degree of freedom between the deck bracket 23 and the deck case 21, particularly in the above-described Z direction, can be effectively restricted.

As shown in fig. 20, the cover plate 24 may have a major axis direction (the direction shown by the dashed line X in fig. 20) and a minor axis direction (the direction shown by the dashed line Y in fig. 20). Wherein the cover plate 24 may have a dimension in the major axis direction greater than a dimension in the minor axis direction. At this time, the first pressing column 242 and the second pressing column 243 are disposed at an interval along the long axis direction. This arrangement increases the reliability of the cover plate 24 pressing the movement holder 23 in the movement case 21.

Further, the number of the second pressing columns 243 may be two that are provided at intervals in the short axis direction. Wherein, the projection of the first pressing column 242 on the cover plate main body 241 and the projection of the two second pressing columns 243 on the cover plate main body 241 form an acute triangle (as shown by the dashed triangle in fig. 20). In this case, the acute triangle may be an acute isosceles triangle or an equilateral triangle. With such arrangement, the interaction points between the cover plate 24 and the movement bracket 23 are arranged symmetrically as much as possible, thereby increasing the reliability of the cover plate 24 pressing the movement bracket 23 in the movement housing 21.

Referring again to fig. 18, the first abutting pillar 242 contacts and abuts the first limiting structure 232, and the second abutting pillar 243 contacts and abuts the second limiting structure 234. At this time, the abutting fit relationship shown in fig. 13 may not be formed between the second limit structure 232 and the annular peripheral wall 212, so as to reduce the processing precision of the second limit structure 232, and further save the manufacturing cost of the movement bracket 23.

Similarly, as shown in fig. 14, the first limiting structure 232 may include a first axial extension 2321 and a first radial extension 2322. The first axial extension 2321 is connected to the holder main body 231 and extends toward the side of the movement 22 along the axial direction of the holder main body 231 (the direction indicated by the dashed line Z in fig. 14); the first radial extension 2322 is connected to the first axial extension 2321 and extends outward of the holder main body 231 in the radial direction of the holder main body 231 (i.e., the direction in which the diameter of the holder main body 231 is located). At this time, the insertion hole 233 is disposed on the first radial extension 2321, and the first pressing column 242 abuts against the first radial extension 2321, that is, the first pressing column 242 abuts against the first radial extension 2321. Further, as shown in fig. 14, the second limiting structure 234 may include a second axial extension 2341 and a second radial extension 2342. The second axial extension 2341 is connected to the bracket main body 231 and extends to the side of the movement 22 along the axial direction of the bracket main body 231; the second radially extending portion 2342 is connected to the second axially extending portion 2341 and extends radially outward of the holder main body 231 in the radial direction of the holder main body 231. At this time, the second pressing column 243 abuts against the second radial extension 2342, that is, both contact and press.

It should be noted that: when the number of the second abutting-pressing columns 243 is two, which are arranged at intervals along the short axis direction, and the projection of the first abutting-pressing column 242 on the cover plate main body 241 and the projection of the two second abutting-pressing columns 243 on the cover plate main body 241 are sequentially connected to form an acute triangle, the number of the second limiting structures 234 may also be two, which are arranged at intervals along the short axis direction, and are respectively arranged corresponding to the second abutting-pressing columns 243. With this arrangement, when the first pressing column 242 abuts against the first limiting structure 232 (specifically, the first radial extension 2322), the two second pressing columns 243 can abut against the second limiting structure 234 (specifically, the second radial extension 2342) respectively, so as to increase the reliability of the cover plate 24 pressing the movement bracket 23 in the movement housing 21.

It is worth noting that: as shown in fig. 18, since the first axial extension 2321 and the second axial extension 2341 extend toward the direction approaching the cover plate 24, the first abutting column 242 and the second abutting column 243 also extend toward the direction approaching the movement housing 21, so that the height of the first limiting structure 232 and the second limiting structure 234 relative to the holder main body 231 and the height of the first abutting column 242 and the second abutting column 243 relative to the cover plate main body 241 can be half of the distance between the cover plate main body 241 and the holder main body 231. With such an arrangement, the first limiting structure 232 and the second limiting structure 234 are prevented from being broken or falling off due to the excessive height of the first limiting structure 232 and the second limiting structure relative to the bracket main body 231 when the bone conduction earphone 10 falls off or collides with other limiting conditions; or, the undesirable phenomena of fracture and falling off when the bone conduction earphone 10 falls off or collides due to the excessive height of the first and second

pressing columns

242 and 243 relative to the cover plate main body 241 are avoided, and the structural strength of the first and second limiting

structures

232 and 234 on the bracket main body 231 and the structural strength of the first and second

pressing columns

242 and 243 on the cover plate main body 241 are considered at the same time.

Referring again to fig. 19, the first pressing column 242 is disposed in a tubular shape. At this time, as shown in fig. 18, the positioning column 213 is not only inserted into the insertion hole 233, so as to increase the assembling accuracy between the movement bracket 23 and the movement housing 21; and is further inserted into the first abutting column 242 to increase the assembling accuracy between the cover plate 24 and the movement housing 21.

As shown in fig. 21, the movement module 20 may further include a first microphone 25 and a second microphone 26. Wherein, after the cover plate 24 is covered on the opening end of the movement housing 21, the two form a cavity structure for accommodating the movement 22. At this time, the first microphone 25 may be accommodated in the movement housing 21, and the second microphone 26 may be disposed outside the movement housing 21, so that the cover plate 24 separates the first microphone 25 from the second microphone 26, thereby avoiding interference therebetween (especially, a rear sound cavity thereof). With this arrangement, the cover plate 24 can not only increase the rigidity of the structure (specifically, the cover plate 24 and the earphone fixing portion 311) located at the opening end of the movement housing 21, but also press the movement bracket 23 in the movement housing 21, and separate the first microphone 25 from the second microphone 26, thereby enabling the cover plate 24 to realize "three functions in one piece". Further, when the ear hook housing 31 is covered on the cover plate 24, that is, the earphone fixing portion 311 is covered on the side of the cover plate 24 away from the movement housing 21, the second microphone 26 may be disposed between the cover plate 24 and the earphone fixing portion 311.

Further, the first microphone 25 and the second microphone 26 may be connected to the main control circuit board 50, so that the two microphones process the sound and transmit the processed sound to the main control circuit board 50. The first microphone 25 and the second microphone 26 may be any one or a combination of electric type, capacitance type, piezoelectric type, carbon particle type, semiconductor type, and the like, and particularly may be an electret type microphone or a silicon type microphone, and the specific structure thereof is within the understanding range of those skilled in the art and will not be described in detail herein. At this time, the first microphone 25 and the second microphone 26 may be used to pick up the sound of the environment where the wearer is located, so as to facilitate the noise reduction processing of the bone conduction headset 10, thereby improving the user's enjoyment of the bone conduction headset 10; and can also be used for picking up the voice of the wearer, so that the bone conduction headset 10 can realize the function of a microphone while realizing the function of a loudspeaker, thereby expanding the application range of the bone conduction headset 10. Of course, the first microphone 25 and the second microphone 26 can also simultaneously pick up the voice of the wearer and the sound of the environment where the wearer is located, so that the bone conduction headset 10 can perform a microphone function and perform noise reduction processing, thereby improving the user's perception of the bone conduction headset 10.

As shown in fig. 21, the annular peripheral wall 212 is provided on the inside with an annular flange 215, and the first sound transmitter 25 can be embedded and fixed in the annular flange 215. A microphone receiving groove 244 is recessed in a side of the cover plate 24 (specifically, the cover plate main body 241) away from the movement housing 21, and the second microphone 26 may be disposed in the microphone receiving groove 244 and covered by the earphone fixing portion 311, so as to reduce the overall thickness of the cover plate 24 and the earphone fixing portion 311 after the second microphone 26 is disposed, thereby increasing the structural feasibility and reliability of the three. In other words, the first microphone 25 is fixed to the annular peripheral wall 212, and the second microphone 26 is fixed to the cover plate 24. In this case, in order to facilitate the first microphone 25 and the second microphone 26 to pick up the voice of the wearer and/or the sound of the environment, a sound pick-up hole (not shown) is generally formed on the annular peripheral wall 212 at a position corresponding to the first microphone 25, and a sound pick-up hole (not shown) is generally formed on the earphone fixing portion 311 at a position corresponding to the second microphone 26. The sound entrance direction of the first microphone 25 may be parallel to the cover plate 24 or may be inclined with respect to the cover plate 24, and the sound entrance direction of the second microphone 26 may be perpendicular to the cover plate 24. So configured, the first microphone 25 and the second microphone 26 can pick up sounds from different directions to increase the noise reduction effect and/or the microphone effect of the bone conduction headset 10, thereby improving the user's enjoyment of the bone conduction headset 10.

It should be noted that: generally, the sound entrance direction of the first microphone 25 is perpendicular to the annular peripheral wall 212; and based on the above detailed description, the plane of the cover plate 24 (specifically, the cover plate main body 214) may be parallel to the plane of the bottom wall 211, and the annular peripheral wall 212 may be perpendicular to the bottom wall 211, or may be inclined outward relative to the bottom wall 211 by an angle (for example, an inclination angle of 30 ° or less). Therefore, when the annular peripheral wall 212 is perpendicular to the bottom wall 211, the sound incoming direction of the first sound transmitter 25 is parallel to the cover plate 24; when the annular peripheral wall 212 is inclined outward at an angle relative to the bottom wall 211, the sound entering direction of the first sound transmitter 25 is inclined relative to the cover plate 24, and the inclination angles of the two may be substantially equal.

Further, the projection of the second microphone 26 on the cover plate 24 and the projection of the first microphone 25 on the cover plate 24 may be offset from each other. So configured, the first microphone 25 and the second microphone 26 can pick up sounds from different directions to increase the noise reduction effect and/or the microphone effect of the bone conduction headset 10, thereby improving the user's enjoyment of the bone conduction headset 10. The projection of the second microphone 26 on the cover plate 24 may be arranged closer to the angled transition 312 than the projection of the first microphone 25 on the cover plate 24. This is arranged to increase the relative distance between the first microphone 25 and the second microphone 26, further enabling the first microphone 25 and the second microphone 26 to pick up sound from different directions. It is worth noting that: the larger the relative distance, the better.

It should be noted that: in the perspective shown in fig. 21, the first microphone 25 and the second microphone 26 are located on opposite sides of the cover plate 24, respectively, and the first microphone 25 is located on the back of the cover plate 24, so that the projection of the first microphone 25 on the cover plate 24 is practically invisible. Therefore, for convenience of description, it is simply considered herein that the first microphone 25 and the second microphone 26 are located on the same side of the cover plate 24, and the projection of the first microphone 25 on the cover plate 24 is replaced by a dashed frame.

As shown in fig. 22, the cover plate 24 may have a major axis direction (the direction shown by the dashed line X in fig. 22) and a minor axis direction (the direction shown by the dashed line Y in fig. 22). Wherein the cover plate 24 may have a dimension in the major axis direction greater than a dimension in the minor axis direction. At this time, an angle between a connecting line (a dotted line shown in fig. 22) between the projection of the second microphone 26 on the cover plate 24 and the projection of the first microphone 25 on the cover plate 24 and the long axis direction is less than 45 °; preferably, the included angle is less than or equal to 10 °. More preferably, a connection line between the projection of the second microphone 26 on the cover plate 24 and the projection of the first microphone 25 on the cover plate 24 coincides with the long axis direction. With this arrangement, the projection of the second microphone 26 on the cover plate 24 and the projection of the first microphone 25 on the cover plate 24 can be offset from each other, and the relative distance between the two can be increased, so that the first microphone 25 and the second microphone 26 can further pick up sounds from different directions. The projection of the second microphone 26 on the cover plate 24 may be arranged closer to the angled transition 312 than the projection of the first microphone 25 on the cover plate 24.

Based on the above detailed description, the movement 22 and the first microphone 25 may be disposed in the movement housing 21, and the cover plate 24 may be covered on the opening end of the movement housing 21, and for the convenience of wiring, the cover plate 24 may be provided with corresponding through holes and grooves. As shown in fig. 21 and 16, the cover plate 24 is further provided with a threading hole 245. Wherein, since the projection of the second microphone 26 on the cover plate 24 can be disposed closer to the bending transition part 312 than the projection of the first microphone 25 on the cover plate 24, the threading hole 245 can be disposed close to the first microphone 25. The arrangement is such that a wire (not shown in fig. 21 and 16) connecting the first microphone 25 and the main control circuit board 50 can extend from the inside of the movement housing 21 to a side of the cover plate 24 away from the movement housing 21 through the wire passing hole 245, and further extend into the accommodating chamber 313 through the wire passing channel in the bent transition portion 312. At this time, after the earphone fixing portion 311 covers the cover plate 24, the wire may also be at least partially (its length may be at least the linear distance of the threading hole 245 with respect to the second microphone 26) located between the cover plate 24 and the earphone fixing portion 311.

Further, as shown in fig. 21 and 16, a side of the cover plate 24 facing away from the movement housing 21 may be further provided with a wiring groove 246 in a recessed manner. One end of the routing groove 246 is connected to the threading hole 245, and the above-mentioned wire can further extend along the routing groove 146. With such an arrangement, the overall thickness of the earphone fixing portion 311 and the cover plate 24 after a part of the wires are disposed therebetween is reduced, and the structural feasibility and reliability of the three portions are improved.

It should be noted that: after the wires are routed from the inside of the movement housing 21 through the wire passing hole 245 and the wire routing groove 246, glue can be dispensed at least at two ends of the wire routing groove 246, so that the wires and the cover plate 24 are relatively fixed, and the structural compactness of the cover plate 24, the earphone fixing part 311 and the wires is further increased. Particularly, the air tightness of the movement module 20 can be improved by dispensing at the threading hole 245.

Further, as shown in fig. 21, two wire management grooves 216 may be provided side by side inside the annular peripheral wall 212, and the two wire management grooves 216 may be adjacent to the annular flange 215. Wherein two solder joints formed between positive and negative external leads (not shown in fig. 21) and positive and negative terminals (not shown in fig. 21) of movement 22 are received in two wire management channels 216. So set up to the bad phenomenon such as short circuit appears when avoiding the positive negative terminal of core 22 and the positive negative pole welding of foretell wire, and then increases the reliability that core 22 walked the line.

In other embodiments, when the bone conduction earphone 10 is further provided with the keys 36 as shown in fig. 4, the side of the cover plate 24 facing away from the movement housing 21 may also be provided with key receiving grooves (visible in fig. 1, but not labeled). The keys 36 are disposed in the key receiving grooves and covered by the earphone fixing portion 311. With such an arrangement, the overall thickness of the cover plate 24 and the earphone fixing portion 311 after the key 36 is disposed therebetween is reduced, and the structural feasibility and reliability of the three are further improved. At this time, the key receiving groove is similar to the microphone receiving groove 244 described above.

It should be noted that: the receiving chamber 313 shown in fig. 2 may be mainly used for receiving the main control circuit board 50, and the receiving chamber 313 shown in fig. 4 may be mainly used for receiving the battery 60. Therefore, the first microphone 25 and the second microphone 26 can both correspond to the ear-hang element 30 shown in fig. 2, so that the two can be connected to the main control circuit board 50, thereby shortening the distance of wiring. In addition, due to the limited volume of the movement module 20 and the ear-hook assembly 30, if the button 36 is disposed together with the first microphone 25 and the second microphone 26, the three components may interfere with each other structurally. Thus, the keys 36 may specifically correspond to the ear-hook assembly 30 shown in fig. 4. In other words, if the key 36 corresponds to a left ear hook of the bone conduction headset 10, the first and

second microphones

25 and 26 may correspond to a right ear hook of the bone conduction headset 10; conversely, if the key 36 corresponds to a right ear hook of the bone conduction headset 10, the first and

second microphones

25 and 26 may correspond to a left ear hook of the bone conduction headset 10. Further, as for the movement module 20 shown in fig. 8, since it does not have the cover plate 24 of the movement module 20 shown in fig. 16, the related structures such as the first microphone 25, the second microphone 26, and the keys 36 may need to be adjusted accordingly. For example: the bone conduction headset 10 has only one first 25 or second 26 microphone; alternatively, the bone conduction headset 10 still has the first and

second microphones

25 and 26, and when either one of the first and

second microphones

25 and 26 corresponds to the left ear hook of the bone conduction headset 10, the other corresponds to the right ear hook of the bone conduction headset 10. For another example: the key 36 is fixed on the side of the earphone fixing portion 311 close to the housing 21.

As shown in fig. 23, the movement 22 may include a flux cap 221, a magnet 222, a flux plate 223, and a coil 224. The magnetic conductive cover 221 may include a bottom plate 2211 and an annular side plate 2212 integrally connected to the bottom plate 2211. Further, the magnet 222 may be disposed in the annular side plate 2212 and fixed to the bottom plate 2211, and the magnetic conductive plate 223 may be fixed to a side of the magnet 222 facing away from the bottom plate 2211. The coil 224 may be disposed in the magnetic gap 225 between the magnet 222 and the annular side plate 2212 and may be secured to the cartridge holder 23. In this embodiment, the magnetic gap between the magnet 222 and the annular side plate 2212 may be m, which is greater than or equal to 1.0mm and less than or equal to 1.5mm, so as to satisfy the motion requirement of the coil 224 and the compactness of the movement 22.

It should be noted that: the movement shown in fig. 23 may correspond to either the movement module shown in fig. 8 or the movement module shown in fig. 16. Further, fig. 23 illustrates a movement bracket, mainly for convenience of describing a relative position relationship between the movement bracket and the movement, and further implicitly illustrates a possible assembly manner between the movement bracket and the movement.

The magnet 222 may be, but is not limited to, a metal alloy magnet, ferrite, or the like. Specifically, the metal alloy magnet may be, but is not limited to, any one or combination of neodymium iron boron, samarium cobalt, alnico, iron chromium cobalt, aluminum iron boron, iron carbon aluminum, and the like; the ferrite can be any one or combination of, but not limited to, barium ferrite, steel ferrite, manganese ferrite, lithium manganese ferrite, and the like. Further, the magnet 222 has a magnetization direction so as to form a relatively stable magnetic field.

The magnetic conducting cover 221 and the magnetic conducting plate 223 are mutually matched and mainly used for adjusting the magnetic field generated by the magnet 222 so as to increase the utilization rate of the magnetic field. The magnetic conductive cover 221 and the magnetic conductive plate 223 may be made of paramagnetic materials such as metal materials, metal alloys, metal oxide materials, and amorphous metal materials. Specifically, the soft magnetic material may be, but not limited to, iron-silicon based alloy, iron-aluminum based alloy, nickel-iron based alloy, iron-cobalt based alloy, low carbon steel, silicon steel sheet, ferrite, and the like.

With this arrangement, the coil 224 is in the magnetic field formed by the magnet 222, the magnetic conductive cover 221 and the magnetic conductive plate 223, and is subjected to an ampere force by the excitation of the electrical signal. Coil 224 causes movement 22 to mechanically vibrate when driven by an ampere force, and movement 22 may be fixed in movement case 21 by movement bracket 23 so that movement case 21 can vibrate therewith. In this embodiment, the resistance of the coil 224 may be 8 Ω, so as to satisfy both the ampere force generation requirement and the circuit structure of the movement 22.

Based on the above detailed description, the volume of the movement housing 21 is often limited, and at least the structural components of the movement 22, the movement bracket 23, and the first microphone 25 need to be accommodated therein. Although greater amperage can be achieved by increasing the movement 22 (e.g., increasing the volume of the magnet 222 and/or increasing the number of turns of the coil 224) to better carry the movement housing 21; however, this also increases the weight and volume of the movement module 20, which is disadvantageous to the weight reduction of the movement module 20. For this reason, the inventors of the present application have conducted a great deal of research and optimized design of the movement 22 based on the ampere force formula F ═ BILsin θ. Wherein, the parameter B may represent the strength of the magnetic field formed by the magnet 222, the magnetic conductive cover 221 and the magnetic conductive plate 223, and the parameter L may represent the effective length of the coil 224 in the above magnetic field; and the parameter θ may represent the angle between the two (where θ is 90 °). Further, the parameter I may represent the current in the coil 224 at a certain moment in time. Obviously, for a designed, manufactured and assembled movement 22, the parameters B and L tend to be relatively definite values; while parameter I varies with the variation of the electrical signal input in movement 22. Therefore, the optimized design of the movement 22 can be simply regarded as the optimized design of the force coefficient BL; the parameters B and L are mainly determined by the structural parameters such as the shapes and the sizes of the magnet 222, the magnetic conductive cover 221 and the magnetic conductive plate 223.

The following describes the influence of the structural parameters such as the shapes and the sizes of the magnet 222, the magnetic conductive cover 221, and the magnetic conductive plate 223 on the force coefficient BL in detail:

in the embodiment of the present application, the magnet 222 may be a cylinder. As shown in fig. 24, the abscissa is the diameter phi of the magnet 222, and the ordinate is the thickness t1 of the magnet 222. This makes it possible to unambiguously derive: the larger the diameter phi of the magnet 222, the larger the value of the force coefficient BL; the greater the thickness t1 of the magnet 222, the greater the value of the force coefficient BL. The inventors of the present application found in long-term studies that: in order for the bone conduction headset 10 to generate sufficient volume, i.e., sufficient amperage, to drive the coil 224 and thereby vibrate the cartridge housing 21, a force coefficient BL greater than 1.3 is typically required. However, considering the weight and volume of the movement module 20 (specifically, the movement 22), the diameter Φ and the thickness t1 of the magnet 222 may preferably satisfy the following relationship: phi is more than or equal to 10.5mm and less than or equal to 11.5mm, and t1 is more than or equal to 3.0mm and less than or equal to 4.0 mm. More preferably, the diameter φ of the magnet 222 may take 10.8mm, and the thickness t1 may take 3.5 mm.

In the embodiment of the present application, the diameter of the magnetic conducting plate 223 may be equal to the diameter of the magnet 222, the thickness of the magnetic conducting plate 223 may be equal to the thickness of the magnetic conducting cover 221, and the magnetic conducting plate 223 and the magnetic conducting cover 221 may also be made of the same material. As shown in fig. 25, the abscissa is the thickness t2 of the flux guide cover 221, and the ordinate is the force coefficient BL. This makes it possible to unambiguously derive: within a certain range, the value of the force coefficient BL increases with the increase of the thickness t 2; however, for t2 > 0.8mm, the variation in the value of the force coefficient BL is not significant, i.e. continuing to increase the thickness t2 after t2 > 0.8mm not only yields little but also increases the weight of the movement 22. Therefore, considering the value of the force coefficient BL (at least greater than 1.3) and the weight and volume of the movement module 20 (specifically, the movement 22), the thicknesses t2 of the magnetic conduction plate 223 and the magnetic conduction cover 221 preferably satisfy the following relation: t2 is not less than 0.4mm and not more than 0.8 mm. More preferably, the thickness t2 may take 0.5 mm.

In the embodiment of the present application, the annular side plate 2212 may also be cylindrical, and the diameter D may be the sum of the diameter Φ of the magnet 222 and twice the magnetic gap m, that is, D ═ Φ +2 m. As shown in fig. 26, the abscissa is the height h of the flux guide cover 221 (specifically, the annular side plate 2212), and the ordinate is the force coefficient BL. This makes it possible to unambiguously derive: within a certain range, the value of the force coefficient BL increases with the increase of the height h of the magnetic conductive cover 221; however, for h > 4.2mm, the value of the force coefficient BL becomes smaller and smaller. Therefore, considering the value of the force coefficient BL (at least greater than 1.3) and the weight and volume of the movement module 20 (specifically, the movement 22), the height h of the flux cap 221 may preferably satisfy the following relationship: h is more than or equal to 3.4mm and less than or equal to 4.0 mm. More preferably, the height h of the magnetic conducting cover 221 can be 3.7 mm.

Referring again to fig. 1, the bone conduction headset 10 may include two movement modules 20. Any one of the two movement modules 20 may correspond to the movement module shown in fig. 8, and the other one may correspond to the movement module shown in fig. 16. It should be noted that: the specific structure of each movement module 20 may be the same as or similar to that of any of the above embodiments, and reference may be made to the detailed description of any of the above embodiments, which is not repeated herein.

As shown in fig. 27, the polarities of the magnets 222 of the two movement modules 20 close to the bottom wall 211 of the movement housing 21 where the magnets are respectively located are different from each other, so that the two movement modules 20 can be attracted to each other when the bone conduction headset 10 is in a non-wearing state. This is provided to facilitate the user's receipt of the bone conduction headset 10. It is worth noting that: the magnet 222 of the present embodiment also serves to form a magnetic field so that the coil 224 can vibrate under the excitation of an electrical signal. At this time, the magnet 222 may realize "one-piece dual use".

Further, the magnets 222 may not be pre-charged prior to assembly of the core module 20; instead, after the movement module 20 is assembled, the movement module 20 as a whole is placed in a magnetizing apparatus to be magnetized, so that the magnet 222 has magnetism. After the above-mentioned magnetizing process, the magnetic field directions of the magnets 222 of the two movement modules 20 may be as shown in fig. 27. With such an arrangement, since the magnet 222 has no magnetism before assembly, the assembly of the core module 20 is not interfered by the magnetic force, so as to increase the assembly efficiency and yield of the core module 20, and further increase the productivity and benefit of the bone conduction earphone 10.

As shown in fig. 28, the rear suspension assembly 40 may include an elastic wire 41, a lead wire 42, and an elastic coating body 43 coating the elastic wire 41 and the lead wire 42. Wherein, the elastic coating body 43 and the lead 42 are an integral structural member formed by extrusion; the cover 43 is further formed with a threading channel (not labeled in fig. 28) in which the elastic wire 41 is threaded. Preferably, the threading channel is formed during the extrusion. Further, the elastic wire 41 may be made of, but not limited to, spring steel, titanium alloy, titanium-nickel alloy, chrome-molybdenum steel, etc., and the elastic coating 43 may be made of, but not limited to, polycarbonate, polyamide, silicone, rubber, etc., so as to facilitate the comfort of the rear suspension assembly 40 and the structural rigidity.

It should be noted that: since the elastic wire 41 is threaded through the covering body 43 via the threading channel, the area of the elastic wire 41 in fig. 28 can be simply regarded as a threading channel in the covering body 43.

Further, the diameter of the threading channel in a natural state may be smaller than the diameter of the elastic wire 41, so that the elastic wire 41 can be kept fixed with the elastic coating body 43 after being inserted into the threading channel, thereby avoiding a bad phenomenon of "collapse" of the rear hook assembly 40 due to an excessively large gap between the elastic coating body 43 and the elastic wire 41, and particularly, in a case where a user presses the rear hook assembly 40, further increasing the structural compactness of the rear hook assembly 40.

In this embodiment, the number of the wires 42 may be at least two. Each strand of wire 42 may include a metal wire and an insulating layer (neither shown in fig. 28) covering the metal wire, the insulating layer being primarily for electrically insulating the metal wires from each other.

It should be noted that: as shown in fig. 1, 2, 4, 8 and 16, since the main control circuit board 50 and the battery 60 may be respectively disposed in the two ear hook assemblies 30, and the ear hook assemblies 30 shown in fig. 2 and 4 may respectively correspond to the left ear hook and the right ear hook of the bone conduction earphone 10, not only the main control circuit board 50 and the battery 60 need to be connected via the wires 42 built in the back cover assembly 40, but also the movement module 20 (specifically, the movement 22 thereof) and the keys 36 corresponding to the (left) ear hook assembly 30 in fig. 1 need to be further connected via the wires 42 built in the back cover assembly 40 to the main control circuit board 50 corresponding to the (right) ear hook assembly 30 in fig. 1, and the movement module 20 (specifically, the movement 22, the first microphone 25 and the second microphone 26 thereof) corresponding to the (right) ear hook assembly 30 in fig. 1 also need to be further connected via the wires 42 built in the back cover assembly 40 to the battery 60 corresponding to the (left) ear hook assembly 30 in fig. 1. Thus, the wire 42 needs to be connected to at least the three-way circuit described above.

Based on the above detailed description, the rear suspension assembly 40 of the embodiment of the present application can be manufactured according to the following process flow:

1) an extrusion molding apparatus and a wire are provided.

On the one hand, the extrusion molding apparatus may be added with a raw material for molding the elastic coating body 43. In the process of extrusion molding, the raw material of the elastic coating body 43 at least undergoes the stages of melting plasticization, extrusion from a die head, shaping, cooling, drawing and the like.

On the other hand, the number of the wires 42 may be at least two in order to facilitate connection between the respective electronic components in the bone conduction headset 10. Further, each strand of wire 42 may include a metal wire and an insulating layer covering the metal wire to facilitate electrical insulation between the metal wires.

2) And placing the lead in an extrusion molding device, so that the raw material of the elastic coating body and the lead can obtain a corresponding first semi-finished product in the extrusion molding process.

Wherein, the extrusion molding device can pull the wire 42 to enable the elastic coating body 43 to coat the wire 42 in the extrusion molding process. Further, the nose part of the extrusion apparatus may be provided with a core to enable the interior of the elastic covering body 43 to form the threading passage described above simultaneously during the extrusion process. Therefore, the first semi-finished product may be an integral structure of the elastic covering body 43 and the wire 42, and the covering body 43 has a threading channel extending substantially along the axial direction thereof.

3) And further cutting the first semi-finished product into second semi-finished products with corresponding lengths according to the use requirements of the rear hanging assembly.

The actual length of the second semi-finished product can be slightly longer than the use length of the second semi-finished product for the rear hanging component, namely the second semi-finished product has a certain allowance at the moment so as to facilitate subsequent processing procedures.

4) And (5) penetrating the elastic metal wire into the threading channel of the second semi-finished product to obtain the rear hanging assembly.

Wherein, after the step 4), the rear hanging component is required to be formed into a bent structure with a certain shape so as to be convenient for being matched with the rear side of the head of the user; the two ends of the rear-mounted component are also required to be correspondingly processed so as to be fixedly connected with the ear-mounted component in a structure and realize the circuit connection among the main control circuit board, the battery, the keys, the machine core, the first microphone and the second microphone. Therefore, the rear hanging component obtained in the step 4) is only a semi-finished product in nature.

In the manner, as a long semi-finished product (specifically, an integral structural member of the elastic coating body 43 and the lead 42) can be manufactured at one time by means of the extrusion molding process, and a threading channel extending along the axial direction of the semi-finished product can be formed inside the coating body 43 at the same time, and then the semi-finished product is cut into small sections with corresponding lengths for subsequent processing, the manufacturing efficiency of the rear hanging assembly can be effectively improved.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes that can be directly or indirectly applied to other related technologies, which are made by using the contents of the present specification and the accompanying drawings, are also included in the scope of the present application.

Claims

1. The utility model provides a core module for bone conduction earphone, a serial communication port, the core module includes core casing, core support, core and apron, the one end opening of core casing, the core support with the core holding is in the core casing, the core is hung and is established on the core support, the apron lid is established on the opening of core casing is served, the apron orientation one side of core casing sets up and supports the pressure structure, support the pressure structure be used for with the core support supports to press to fix in the core casing.

2. The movement module according to claim 1, wherein the cover plate includes a cover plate main body and a pressing structure integrally connected to the cover plate main body, the pressing structure includes a first pressing post and a second pressing post, and the first pressing post and the second pressing post are disposed at an interval along a circumferential direction of the cover plate main body and form an abutment with the movement bracket.

3. The movement module according to claim 2, wherein the cover main body has a long axis direction and a short axis direction, a dimension of the cover main body in the long axis direction is larger than a dimension of the cover main body in the short axis direction, and the first pressing column and the second pressing column are spaced apart from each other in the long axis direction.

4. The movement module according to claim 3, wherein the number of the second pressing pillars is two, and the projections of the first pressing pillars on the cover plate main body and the projections of the two second pressing pillars on the cover plate main body are sequentially connected to form an acute triangle.

5. The movement module according to claim 2, wherein the movement holder includes an annular holder main body and a first limit structure and a second limit structure provided on the holder main body, the movement is hung on the movement holder, the first limit structure and the second limit structure are provided at intervals along a circumferential direction of the holder main body, the first pressure column is in contact with the first limit structure and forms an abutment, and the second pressure column is in contact with the second limit structure and forms an abutment.

6. The movement module according to claim 5, wherein the movement housing includes a bottom wall and an annular peripheral wall, one end of the annular peripheral wall is integrally connected to the bottom wall, the other end of the annular peripheral wall, which is away from the bottom wall, is provided with an opening, the bottom wall is used for contacting with the skin of a user, the movement housing further includes a positioning column connected to the bottom wall or the annular peripheral wall, the first limiting structure is provided with an insertion hole, and the positioning column is inserted into the insertion hole.

7. The movement module according to claim 6, wherein the first limiting structure includes a first axial extending portion and a first radial extending portion, the first axial extending portion is connected to the holder main body and extends toward the side of the movement along the axial direction of the holder main body, the first radial extending portion is connected to the first axial extending portion and extends toward the outside of the holder main body along the radial direction of the holder main body, the insertion hole is provided in the first radial extending portion, the first pressing column abuts against the first radial extending portion, the second limiting structure includes a second axial extending portion and a second radial extending portion, the second axial extending portion is connected to the holder main body and extends toward the side of the movement along the axial direction of the holder main body, and the second radial extending portion is connected to the second axial extending portion, and extend to the outside of support main part along the radial of support main part, second is pushed against the post with second radial extension butt, the core is located between first axial extension and the second axial extension.

8. The movement module according to claim 7, wherein the first pressing column is disposed in a tubular shape, and the positioning column is further inserted into the first pressing column.

9. The movement module according to claim 6, wherein the outer contour of the holder main body is circular, the annular peripheral wall is provided with two arc-shaped recessed areas along the short axis direction, and the outer contour of the holder main body is respectively embedded into the two arc-shaped recessed areas.

10. A bone conduction headset, characterized in that, bone conduction headset includes ear-hang subassembly, battery and the core module of any one of claims 1-9, the core module sets up in the one end of ear-hang subassembly, the battery sets up in the other end of ear-hang subassembly.