WO2024146056A1

WO2024146056A1 - Two-color injection molded waterproof structure of bone conduction earpiece and two-color injection molding method

Info

Publication number: WO2024146056A1
Application number: PCT/CN2023/097741
Authority: WO
Inventors: 毛华生; 曾鸿
Original assignee: 东莞市猎声电子科技有限公司
Priority date: 2023-01-04
Filing date: 2023-06-01
Publication date: 2024-07-11
Also published as: CN116156380B; CN116156380A

Abstract

A two-color injection molded waterproof structure of a bone conduction earpiece, comprising an accommodation chamber, a light guide column, a sound production device and an ear hook. The accommodation chamber and the light guide column are molded in an integrated manner by means of two-color injection molding; one end of the ear hook covers the sound production device; and the other end of the ear hook covers the surface of the accommodation chamber and abuts against the side surface of the light guide column. Compared with the prior art, the light guide column and the accommodation chamber are molded in an integrated manner by means of a two-color injection molding process, so that such a structure can avoid assembling gaps caused by assembling the light guide column and the accommodation chamber, thereby improving the waterproof performance of the accommodation chamber, and further enhancing the waterproof performance of the bone conduction earpiece. Additionally, since the light guide column and the accommodation chamber are molded in an integrated manner by means of two-color injection molding, assembling is not required, thus improving the assembling efficiency, and also enhancing the structural strength of the whole accommodation chamber.

Description

A double-shot injection molding waterproof structure and double-shot injection molding method for bone conduction earphones

Technical Field

The present invention relates to the technology of bone conduction earphone manufacturing field, and in particular to a double-shot injection molding waterproof structure of bone conduction earphone and a double-shot injection molding method.

Background technique

There are two main ways of sound conduction: air conduction and bone conduction. In air conduction, sound waves pass through the outer ear and middle ear to the cochlea and inner ear. Bone conduction, on the other hand, converts sound into mechanical vibrations of different frequencies and transmits sound waves through the human skull, bony labyrinth, inner ear lymph, spiral organ, auditory nerve, and auditory center. That is, the sound is transmitted to the inner ear auditory nerve through the skull, and its conduction speed is faster. When wearing it, there is no need to cover the ear holes, and the external prompt sound can be heard, avoiding some dangers. Therefore, it is loved by consumers.

In the prior art, bone conduction headphones are usually equipped with a light guide column, which allows users to identify different working states of the bone conduction headphones by changing different colors of the light guide column; however, when developing bone conduction headphones, the inventor found that after the light guide column was assembled in the shell of the bone conduction headphones, there would be an assembly gap between the light guide column and the shell, resulting in poor waterproof performance.

Therefore, it is necessary to study a new technical solution to solve the above problems.

Summary of the invention

In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a double-shot injection molding waterproof structure and a double-shot injection molding method for bone conduction headphones, so as to effectively solve the technical defect of poor waterproof performance of bone conduction headphones equipped with light guide columns in the prior art.

To achieve the above object, the present invention adopts the following technical solution:

A double-shot injection-molded waterproof structure of a bone conduction headset comprises: a storage compartment, a light guide column, a sound-emitting device and an ear hook; the storage compartment and the light guide column are molded together by two-color injection molding, one end of the ear hook is coated on the sound-emitting device, and the other end of the ear hook is coated on the surface of the storage compartment and abuts against the side of the light guide column.

The beneficial effect of the double-shot injection molding waterproof structure of a bone conduction headset provided by the present application is that: compared with the prior art, the light guide column and the receiving chamber are molded together by adopting a two-color injection molding process. Such a structure can avoid the assembly gap caused by the assembly of the light guide column and the receiving chamber, thereby improving the waterproof performance of the receiving chamber, and further enhancing the waterproof performance of the bone conduction headset; at the same time, since the light guide column and the receiving chamber are molded together by two-color injection molding, no assembly is required, which can not only improve the assembly efficiency, but also improve the structural strength of the entire receiving chamber.

As a preferred solution: the side surface of the light guide column is inclined outward from bottom to top, and an embedding recess is provided on the side surface of the light guide column, and the plastic of the accommodating chamber can be filled into the embedding recess.

By setting the embedding recess, the plastic of the receiving chamber can be filled into the embedding recess when the light guide column and the receiving chamber are injection molded, thereby increasing the bite force between the light guide column and the receiving chamber, making the connection strength between the light guide column and the receiving chamber higher, and further improving the waterproof effect.

As a preferred solution: the accommodating compartment includes a first shell and a second shell, the second shell is snap-fitted and installed on the bottom of the first shell to form a hollow accommodating cavity, and the light guide column and the second shell are molded together by two-color injection molding.

As a preferred solution, the light guide column extends downward and protrudes out of the outer side surface of the second shell to form a first protrusion, and the ear hook covers the outer side surface of the second shell and abuts against the side surface of the first protrusion.

By setting the first protrusion, the ear hook can be against the peripheral side of the light guide column when it is covered by the second shell, and the outer surface of the ear hook is flush with the outer surface of the first protrusion; such a structure can improve the flatness of its appearance so that its surface does not feel abrupt; and the ear hook can be limited by means of the first protrusion, thereby improving the firmness of the ear hook and preventing it from falling off easily.

As a preferred solution: the length and width of the first shell are both greater than the length and width of the second shell. After the first shell and the second shell are snap-fitted and installed with each other, a first assembly notch is provided at the bottom of the inner side surface of the first shell; the top of the second shell is provided with a first limiting protrusion that can abut against the inner side surface of the first shell and a first assembly protrusion that can abut against the first assembly notch.

As a preferred solution: a first embedding groove is provided on the side of the second shell, the first embedding groove is located below the first assembly protrusion, the top surface of the first embedding groove is flush with the bottom surface of the first shell, and the plastic of the ear hook can be embedded in the first embedding groove and abut against the bottom surface of the first shell to close the gap between the first shell and the second shell.

By cleverly setting the structure of the first embedding groove and the first assembly protrusion, not only can the assembly of the first shell and the second shell be facilitated, but the plastic of the ear hook can also be embedded in the first embedding groove to close the gap between the first shell and the second shell, thereby further improving the waterproof effect.

As a preferred solution: the storage bin is injection molded with nylon fiber-reinforced material or plastic fiber-reinforced material. By injection molding the storage bin with nylon fiber-reinforced material or plastic fiber-reinforced material as raw material, the elongation at break can be reduced and the tensile strength can be enhanced, thereby making the storage bin hard and improving the drop resistance.

As a preferred solution: there are two accommodating chambers, which are connected via a rear hanging assembly; there are two sound-generating devices, one sound-generating device is connected to one accommodating chamber.

A double-shot injection molding method for manufacturing a double-shot injection molding waterproof structure of a bone conduction earphone comprises the following steps:

Step 1: Use a two-color injection molding machine, and install a two-color injection mold that can form a row of light guide columns and a accommodating bin on the two-color injection molding machine;

Step 2: Perform the first injection of glue in the two-color injection mold to injection-mold the light guide column and complete the first injection molding;

Step 3: After the step 3 operation is completed, the rear mold of the two-color injection mold is rotated 180 degrees, and the front mold is kept stationary, and the second injection of glue is continued in the two-color injection mold, and the accommodating bin is injection-molded on the basis of the light guide column, so that the accommodating bin and the light guide column are injection-molded together to obtain a semi-finished product;

Step 4: Transfer the semi-finished product of step 3 to the overmolding mold, and wrap the semi-finished product with the injection-molded ear hook to complete the ear hook covering the light guide column and the receiving compartment, thereby obtaining a double-shot injection-molded waterproof structure of the bone conduction earphone.

The double-shot injection molding method for producing a double-shot injection molding waterproof structure of a bone conduction headset provided in the present application has the beneficial effect that, compared with the prior art, the light guide column and the receiving chamber are molded together by the double-shot injection molding method, thereby eliminating the tedious assembly work and improving production efficiency; at the same time, there is no assembly gap between the light guide column and the receiving chamber, thereby further improving the waterproof performance of the product.

As a preferred solution: when the light guide column is injection molded, an inclined surface and an embedding recess are provided on the side of the light guide column so that the plastic of the accommodating chamber can be filled into the embedding recess.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a schematic diagram of a three-dimensional structure of a double-shot injection-molded waterproof structure of a bone conduction headset provided in an embodiment of the present application;

FIG2 is a schematic diagram of a three-dimensional structure of a double-shot injection-molded waterproof structure of a bone conduction headset shown in FIG1 from another angle;

FIG3 is a partial structural exploded view of the double-shot injection-molded waterproof structure of the bone conduction earphone shown in FIG1 ;

FIG4 is a first cross-sectional view of a partial structure of a double-shot injection-molded waterproof structure of a bone conduction earphone shown in FIG1 ;

FIG5 is a partial enlarged view of point A in FIG4;

FIG6 is a second cross-sectional view of a partial structure of the double-shot injection-molded waterproof structure of the bone conduction earphone shown in FIG1 ;

FIG7 is a partial enlarged view of point B in FIG6;

FIG8 is a general flow chart of a double-shot injection molding method for a double-shot injection molding waterproof structure of a bone conduction earphone provided in the present application.

Among them, the reference numerals in the figure are:

10. accommodating compartment; 101. first housing; 1011. first assembly notch; 1012. first buckling convex portion; 1013. first locking notch; 102. second housing; 1021. first limiting convex portion; 1022. first assembly convex portion; 1023. first embedding groove; 1024. second buckling convex portion; 1025. first locking arm; 103. accommodating cavity;

20. light guide column; 21. embedded recess; 22. first raised portion;

30. Sound-generating device; 40. Ear hook; 50. Rear hook assembly.

Implementation

In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to Figures 1 to 8 to describe a double-shot injection-molded waterproof structure of a bone conduction headset provided in an embodiment of the present application. The double-shot injection-molded waterproof structure of a bone conduction headset includes: a storage compartment 10, a light guide column 20, a sound-generating device 30, and an ear hook 40.

The storage bin 10 and the light guide column 20 are molded together by two-color injection molding, one end of the ear hook 40 is covered on the sound-emitting device 30, and the other end of the ear hook 40 is covered on the surface of the storage bin 10 and abuts against the side of the light guide column 20. Specifically, by using the two-color injection molding process to mold the light guide column 20 and the storage bin 10 together, such a structure can avoid the assembly gap caused by the assembly of the light guide column 20 and the storage bin 10, thereby improving the waterproof performance of the storage bin 10 and further enhancing the waterproof performance of the bone conduction earphone; at the same time, since the light guide column 20 and the storage bin 10 are molded together by two-color injection molding, no assembly is required, which can not only improve the assembly efficiency, but also improve the structural strength of the entire storage bin 10.

Please refer to Figures 3 to 7 together. The side of the light guide column 20 is inclined outward from bottom to top. The side of the light guide column 20 is provided with an embedding recess 21, and the plastic of the storage bin 10 can be filled into the embedding recess 21. The side of the light guide column 20 is inclined, which can also be understood as that the outer surface of the light guide column 20 is smaller than the inner surface of the light guide column 20 to form an inclined side structure. Such a structure can make it difficult for the light guide column 20 to be outwardly separated from the connection with the storage bin 10 even if an external force acts on the light guide column 20 when the light guide column 20 and the storage bin 10 are injection molded together, thereby improving the connection strength and connection reliability of the light guide column 20 and the storage bin 10.

In the embodiment of the present application, the storage compartment 10 includes a first shell 101 and a second shell 102. The second shell 102 is snap-fitted and installed on the bottom of the first shell 101 to form a hollow storage cavity 103. The light guide column 20 and the second shell 102 are molded together by two-color injection molding. There are two storage compartments 10, and the two storage compartments 10 are connected by a rear hanging component 50; there are two sound-generating devices 30, and one sound-generating device 30 is connected to one storage compartment 10. One of the two storage compartments 10 can be used as a battery compartment for accommodating a power source, and the other can be used as a control compartment for controlling the operation of the bone conduction headset. The control device can be installed in the control compartment.

Next, the light guide column 20 extends downward and protrudes from the outer side of the second shell 102 to form a first protrusion 22. The ear hook 40 is wrapped around the outer side of the second shell 102 and abuts against the side of the first protrusion 22. The outer surface of the ear hook 40 is flush with the outer surface of the first protrusion 22. Such a structure can improve the flatness of its appearance, so that its surface does not feel abrupt; and the ear hook 40 can be limited by the first protrusion 22 to improve the firmness of the ear hook 40 and prevent it from falling off. The ear hook 40 can be made of silicone injection molding only, or it can be made of silicone injection molding and a frame; because the ear hook 40 is made of silicone, it can play a role in protecting the storage bin 10 and reduce the damage and water leakage of the storage bin caused by external forces.

More specifically, the length and width of the first shell 101 are greater than those of the second shell 102, and a first assembly notch 1011 is provided at the bottom of the inner side surface of the first shell 101; a first limiting convex portion 1021 capable of abutting against the inner side surface of the first shell 101 and a first assembly convex portion 1022 capable of abutting against the first assembly notch 1011 are provided at the top of the second shell 102. A first embedding groove 1023 is provided on the side surface of the second shell 102, and the first embedding groove 1023 is located below the first assembly convex portion 1022. The top surface of the first embedding groove 1023 is flush with the bottom surface of the first shell 101, and the plastic (i.e., silicone material) of the ear hook 40 can be embedded in the first embedding groove 1023 and abut against the bottom surface of the first shell 101 to close the gap between the first shell 101 and the second shell 102. By cleverly setting the structure of the first embedding groove 1023 and the first assembly protrusion 1022, not only can the assembly of the first shell 101 and the second shell 102 be facilitated, but the plastic of the ear hook 40 can also be embedded in the first embedding groove 1023 to close the gap between the first shell 101 and the second shell 102, thereby further improving the waterproof effect.

In the embodiment of the present application, the storage bin 10 is injection molded using nylon fiber-added material or plastic fiber-added material. When nylon fiber-added material is used, PA6 and PA66 are used as the base material, and glass fiber is added and co-extruded during hot melting, and a compatibilizer and stabilizer are mixed at the same time; 10-50% of fiber is added to improve the strength, so that the storage bin 10 produced has high hardness and hardness, making the storage bin 10 more resistant to falling and deformation, and providing better protection for the components in the storage bin 10.

Please refer to FIGS. 3 to 8 , the first housing 101 is provided with a first buckling protrusion 1012 at the bottom of the inner side surface, and the second housing 102 is provided with a second buckling protrusion 1024 at the top of the outer side surface. When the first housing 101 and the second housing 102 are buckled with each other, the first buckling protrusion 1012 is limited below the second buckling protrusion 1024, so that the first buckling protrusion 1012 and the second buckling protrusion 1024 are buckled with each other to complete the limitation of the first housing 101 and the second housing 102. In addition, the first housing 101 is provided with a first locking notch 1013 at the bottom of the inner side surface, and the second housing 102 is provided with a first locking arm 1025 that can be buckled into the first locking notch 1013 at the top of the outer side surface.

Specifically, there are a plurality of first buckling protrusions 1012, which are respectively arranged on the front and rear surfaces of the inner side of the first housing 101, and the plurality of first buckling protrusions 1012 are arranged at intervals from left to right. There are a plurality of second buckling protrusions 1024, which are correspondingly arranged on the front outer side and the rear outer side of the first position-limiting protrusion 1021, and the plurality of second buckling protrusions 1024 are arranged at intervals from left to right. There are at least two first locking notches 1013, and the two first locking notches 1013 are correspondingly arranged on the left and right sides of the inner side of the first housing 101, and the first locking arms 1025 are respectively arranged on the left and right sides of the bottom of the first position-limiting protrusion 1021, and one first locking arm 1025 can be correspondingly buckled into one first locking notch 1013. With such a structure, when the first housing 101 and the second housing 102 need to be disassembled, it is only necessary to press the left and right sides of the second housing 102 to pull the first housing 101 and the second housing 102 apart, so that the first buckling protrusion 1012 and the second buckling protrusion 1024 are separated, and the first housing 101 and the second housing 102 are disassembled. Due to the buckling limit of the first buckling protrusion 1012 and the second buckling protrusion 1024, and the buckling of the first locking arm 1025 and the first locking notch 1013, a double buckling structure is realized to ensure the buckling reliability of the first housing 101 and the second housing 102, and prevent them from being easily disengaged.

Please refer to FIG. 8 . Next, a double-shot injection molding method for a double-shot injection molding waterproof structure of a bone conduction headset provided by the present application is described in detail. The double-shot injection molding method comprises the following steps:

Step 1: Use a two-color injection molding machine, on which a two-color injection mold capable of forming a row of light guide columns 20 and a receiving chamber 10 is installed;

Step 2: Injection molding the light guide column 20 to complete the first injection molding;

Step 3: After the step 3 is completed, the rear mold of the two-color injection mold is rotated 180 degrees, and the front mold is kept stationary. The second injection of glue is continued in the two-color injection mold. The accommodating bin 10 is injection-molded on the basis of the light guide column 20, so that the accommodating bin 10 and the light guide column 20 are injection-molded together to obtain a semi-finished product;

Step 4: Transfer the semi-finished product of step 3 to the overmolding mold, and inject the ear hook 40 to wrap the semi-finished product, so as to complete the ear hook 40 covering the light guide column 20 and the accommodating chamber 10, and obtain the double-shot injection-molded waterproof structure of the bone conduction earphone.

Specifically, in step 2, when the light guide column 20 is injection molded, an inclined surface and an embedding recess 21 are set on the side of the light guide column 20, so that the plastic of the accommodating bin 10 can be filled into the embedding recess 21; when the accommodating bin 10 is injection molded, the plastic of the accommodating bin 10 can be buried into the embedding recess 21, so that the plastic of the accommodating bin 10 bites the light guide column 20, thereby improving the connection strength and waterproof performance between the light guide column 20 and the accommodating bin 10.

Specifically, in step 3, after the first shell 101 and the second shell 102 are buckled together, the assembled storage compartment 10 can be placed in a rubber-coated mold for injection molding of the ear hook 40, so that the plastic of the ear hook 40 can be filled into the first embedding groove 1023, and rest against the bottom surface of the first shell 101 and close the gap between the first shell 101 and the second shell 102.

The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

A bone conduction earphone double-shot injection-molded waterproof structure, characterized in that it comprises: a storage bin (10), a light guide column (20), a sound-generating device (30) and an ear hook (40); the storage bin (10) and the light guide column (20) are molded together by double-shot injection molding, one end of the ear hook (40) is coated on the sound-generating device (30), and the other end of the ear hook (40) is coated on the surface of the storage bin (10) and abuts against the side of the light guide column (20).
According to claim 1, a double-shot injection-molded waterproof structure for bone conduction headphones is characterized in that the side surface of the light guide column (20) is inclined outward from bottom to top, and an embedding recess (21) is provided on the side surface of the light guide column (20), and the plastic of the accommodating chamber (10) can be filled into the embedding recess (21).
According to claim 1, a double-shot injection-molded waterproof structure of a bone conduction headset is characterized in that: the accommodating chamber (10) includes a first shell (101) and a second shell (102), the second shell (102) is snap-fitted and installed on the bottom of the first shell (101) to form a hollow accommodating cavity (103), and the light guide column (20) and the second shell (102) are molded together by two-color injection molding.
According to claim 3, a double-shot injection-molded waterproof structure of a bone conduction headset is characterized in that: the light guide column (20) extends downward and protrudes from the outer side surface of the second shell (102) to form a first protrusion (22), the ear hook (40) is wrapped around the outer side surface of the second shell (102) and abuts against the side surface of the first protrusion (21), and the outer surface of the ear hook (40) is flush with the outer surface of the first protrusion (21).
A double-shot injection-molded waterproof structure for bone conduction earphones according to claim 3 or 4, characterized in that: the length and width of the first shell (101) are both greater than the length and width of the second shell (102), and after the first shell (101) and the second shell (102) are mutually buckled and installed, a first assembly notch (1011) is provided at the bottom of the inner side surface of the first shell (101);

The top of the second shell (102) is provided with a first limiting protrusion (1021) capable of abutting against the inner side surface of the first shell (101) and a first assembly protrusion (1022) capable of abutting against the first assembly notch (1011).
According to claim 5, a double-shot injection-molded waterproof structure of a bone conduction headset is characterized in that: a first embedding groove (1023) is provided on the side of the second shell (102), the first embedding groove (1023) is located below the first assembly protrusion (1022), the groove top surface of the first embedding groove (1023) is flush with the bottom surface of the first shell (101), and the plastic of the ear hook (40) can be embedded in the first embedding groove (1023) and abut against the bottom surface of the first shell (101) to close the gap between the first shell (101) and the second shell (102).
The double-shot injection-molded waterproof structure of a bone conduction earphone according to claim 1 is characterized in that the accommodating compartment (10) is injection-molded using nylon fiber-reinforced material or plastic fiber-reinforced material.
According to claim 1, a double-shot injection-molded waterproof structure of a bone conduction earphone is characterized in that: there are two accommodating chambers (10), and the two accommodating chambers (10) are connected via a rear hanging component (50); there are two sound-generating devices (30), and one sound-generating device (30) is connected to one accommodating chamber (10).
A double-shot injection molding method for manufacturing a double-shot injection molding waterproof structure of a bone conduction earphone according to any one of claims 1 to 8, characterized in that it comprises the following steps:

Step 1: using a two-color injection molding machine, on which a two-color injection molding mold capable of forming a row of light guide columns (20) and a receiving chamber (10) is installed;

Step 2: injecting glue for the first time in the two-color injection mold to injection-mold the light guide column (20), completing the first injection molding;

Step 3: After step 3 is completed, the rear mold of the two-color injection mold is rotated 180 degrees, the front mold remains unchanged, and the second injection of glue is continued in the two-color injection mold, and the accommodating bin (10) is injection-molded on the basis of the light guide column (20), so that the accommodating bin (10) and the light guide column (20) are injection-molded together to obtain a semi-finished product;

Step 4: Transfer the semi-finished product of step 3 to the overmolding mold, and inject the ear hook (40) to wrap the semi-finished product, so as to complete the ear hook (40) covering the light guide column (20) and the accommodating chamber (10), thereby obtaining a double-shot injection-molded waterproof structure of the bone conduction earphone.
The double-shot injection molding method according to claim 9 is characterized in that: when the light guide column (20) is injection molded, an inclined surface and an embedding recess (21) are provided on the side of the light guide column (20) so that the plastic in the accommodating chamber (10) can be filled into the embedding recess (21).