CN-121985469-A - Anti-interference flexible circuit board, method and device of audio device with camera shooting function

CN121985469ACN 121985469 ACN121985469 ACN 121985469ACN-121985469-A

Abstract

The invention discloses an anti-interference flexible circuit board, a method and a device of an audio device with a camera shooting function. The flexible circuit board is of an integrated strip-shaped multi-layer circuit structure, and the outer conductive layer is provided with a differential signal line group for transmitting digital video and a main clock line and is covered by an electromagnetic shielding film to form a shielding cavity. In addition, the flexible circuit board is also integrated with an analog audio drive line set and an independent microphone ground line which is physically isolated from the main ground network and is electrically connected only at the terminal portion or pad position, and is provided with a package to provide outer layer protection. The invention effectively reduces the common-ground interference of the mixed transmission of the high-speed digital signal and the analog signal in a narrow and limited space by the design of layered wiring and shielding isolation, and greatly improves the signal quality.

Inventors

HE WEI
MA ZHIYUN

Assignees

深圳市睿宝智能科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251223

Claims (20)

1. An anti-interference flexible circuit board of an audio device with a camera function, which is characterized by comprising: The flexible conductive laminated structure is configured into an integrated flexible strip-shaped structure and is divided into a mounting part and a connecting part along the length direction, and the width of the connecting part is between 2 and 12 millimeters; the flexible conductive laminated structure comprises a first conductive layer and a second conductive layer which are used as outer signal layers, and a core layer positioned between the first conductive layer and the second conductive layer, wherein the first conductive layer, the core layer and the second conductive layer are separated by an insulating medium; the first conductive layer and/or the second conductive layer is/are formed with a differential signal line group and a master clock line, the differential signal line group is used for transmitting digital video signals, the master clock line is used for synchronizing clock frequencies of master equipment and slave equipment, and the core layer forms a reference potential layer at least in a partial area; An electromagnetic shielding film covering the outer surfaces of the first and second conductive layers respectively so as to wrap the core layer, the differential signal line group and the main clock line together in a shielding cavity formed by the electromagnetic shielding film in at least a part of the area of the connecting part, and The packaging body is arranged at the connecting part to cover the flexible conductive laminated structure and form outer layer protection; The flexible conductive laminated structure is further provided with an analog audio driving line group and an electrically independent microphone grounding line, the analog audio driving line group is used for transmitting driving current to an audio transducer, the microphone grounding line is in physical isolation relation with a main grounding line network of the flexible conductive laminated structure, and the microphone grounding line is electrically connected with the main grounding line network only at a terminal part and/or a bonding pad position.
2. The tamper resistant flexible circuit board of an audio device with camera functionality of claim 1, wherein the core layer is a composite structure of a single conductive layer or a plurality of internal conductive layers separated by insulating media.
3. The tamper resistant flexible circuit board of an audio device with camera functionality of claim 2, wherein when the core layer is a plurality of internal conductive layers, the analog audio drive line groups are distributed among different internal conductive layers to increase current carrying capacity.
4. The anti-interference flexible circuit board with the camera shooting function for the audio device according to claim 1, wherein the first conductive layer, the second conductive layer and the core layer are made of glue-free rolled copper so as to meet the dynamic bending requirement of the connecting portion.
5. The anti-interference flexible circuit board with an image pickup function of an audio device according to claim 1, wherein the differential signal line group includes MCN, MCP, MDN and MDP0 lines for transmitting MIPI signals, and the differential signal line group is directly adjacent to the electromagnetic shielding film in a lamination direction so that the electromagnetic shielding film absorbs high-frequency radiation in the vicinity.
6. The anti-interference flexible circuit board with camera function according to claim 1, wherein the line width of the analog audio driving line group is not less than 0.2 mm, and the grounding shielding lines with line width not less than 0.3 mm are arranged in parallel on two sides of the analog audio driving line group for isolating the same-layer interference.
7. The tamper resistant flexible circuit board of an audio device with camera functionality of claim 1, wherein the microphone ground wire remains independently routed throughout the length of the connection portion of the flexible ribbon structure, with equipotential connections to the main ground network only at pad locations.
8. The anti-interference flexible circuit board with camera function according to claim 1, wherein the core layer serves as a reference ground plane for the first conductive layer and the second conductive layer, and a specific dielectric thickness is configured between the differential signal line group and the core layer to control characteristic impedance.
9. The tamper resistant flexible circuit board of claim 1, wherein said encapsulation is a waterproof elastomeric material and hermetically encapsulates said flexible conductive laminate structure.
10. The anti-interference flexible circuit board with the camera shooting function for the audio device according to claim 1, wherein the flexible band-shaped structure is integrally of a U-shaped design, and the length of the connecting part is adapted to the semi-winding size of the outer side of the human ear.
11. The anti-interference flexible circuit board with camera function of audio device according to any one of claims 1 to 10, wherein a nano waterproof coating is provided on an outer surface of the flexible conductive laminate structure, and the nano waterproof coating is a thin film layer having a hydrophobic property.
12. A method for manufacturing an anti-interference flexible circuit board of an audio device with an image capturing function according to any one of claims 1 to 11, comprising: Providing a core layer, wherein the core layer forms a reference potential layer at least in a partial area; forming a first conductive layer and a second conductive layer on the upper surface and the lower surface of the core layer respectively, wherein the first conductive layer and the second conductive layer are physically isolated from the core layer by an insulating medium, so that a flexible conductive laminated structure is formed, and patterning treatment is performed on the first conductive layer and/or the second conductive layer to form a differential signal line group and a main clock line; respectively attaching electromagnetic shielding films to the outer surfaces of the first conductive layer and the second conductive layer, so as to construct an electromagnetic shielding cavity for wrapping the core layer, the differential signal line group and the main clock line; cutting the flexible conductive laminated structure covered with the electromagnetic shielding film into an integrated flexible belt-shaped structure, dividing the integrated flexible belt-shaped structure into a mounting part and a connecting part along the length direction, wherein the width of the connecting part is between 2 and 12 millimeters, and Forming a package body at the connection part to cover the flexible conductive laminated structure and form an outer layer protection; The flexible conductive laminated structure is also provided with an analog audio driving line group and an electrically independent microphone grounding line, the analog audio driving line group is used for transmitting driving current to the audio transducer, and the microphone grounding line and a main grounding line network of the flexible conductive laminated structure are in physical isolation relation.
13. The method for manufacturing an anti-interference flexible circuit board with camera function according to claim 12, wherein the electrically independent microphone grounding wire is formed in the core layer, so that the microphone grounding wire keeps independent wiring on the whole length of the connection part of the flexible strip-shaped structure, and equipotential connection is performed with the main ground network only at a pad position.
14. The method for manufacturing an anti-interference flexible circuit board with an audio device with a camera function according to claim 12, wherein the package body is made of waterproof elastic material and is formed in an injection molding mode.
15. An audio device with a camera function, comprising: A rear hitch assembly for encircling the rear side of the user's head; Ear-hanging components respectively connected with two ends of the back-hanging component, each ear-hanging component is provided with a proximal end connected with the back-hanging component and a distal end extending above the auricle of the user and pointing to the facial area of the user; The tamper resistant flexible circuit board of any of claims 1 to 11, connected to the distal end; The ear bag component is physically connected to the far end of the ear hook component through the anti-interference flexible circuit board, and is provided with a hard shell, and an audio transducer is accommodated in the hard shell; a camera module slidably connected to the outside of the ear bag assembly for collecting video signals from a first person perspective, and The main control circuit board is arranged in the inner cavity of the ear-hook component; The anti-interference flexible circuit board is used as a flexible bridging piece for connecting the ear-hook assembly and the ear-bag assembly, a connecting part of the anti-interference flexible circuit board penetrates through the ear-hook assembly and is inserted into the main control circuit board, a mounting part of the anti-interference flexible circuit board extends into a hard shell of the ear-bag assembly and is electrically connected with the camera module, and a packaging body of the anti-interference flexible circuit board wraps and seals a connecting part between the far end of the ear-hook assembly and the hard shell of the ear-bag assembly to form outer protection; The anti-interference flexible circuit board is used as a main mixed signal transmission channel and is used for simultaneously transmitting video signals of the camera module and audio signals of the audio transducer.
16. The audio device with camera shooting function according to claim 15, wherein the camera module comprises a main body part and a flexible extension part integrally extending from the main body part, wherein a redundant bending section is reserved on the flexible extension part, the redundant bending section is in an S shape, a U shape or a wave shape, and when the camera main body slides relative to the ear bag assembly, a telescopic allowance is provided through deformation of the flexible extension part.
17. The audio device with camera function according to claim 16, wherein a connecting terminal is welded at the end of the flexible extension portion, and the camera module is welded and fixed to the mounting portion of the anti-interference flexible circuit board through a surface mounting process, so that electrical conduction and mechanical connection between the camera module and the anti-interference flexible circuit board are achieved.
18. The audio device with camera function according to claim 16, wherein the camera module is integrated with an anti-shake module, and the anti-shake module is disposed in or on the main body portion, for maintaining stability of image acquisition when the camera module moves with a user's head.
19. The audio device with camera shooting function according to claim 15, wherein a guide rail or a chute extending in the front-rear direction is provided on the outer side of the ear cup assembly, and the camera module is slidably connected through the guide rail or the chute, so that a user can adjust the horizontal position of the shooting field of view.
20. The audio device with camera function according to claim 15, further comprising a rigid support bar penetrating inside the package, wherein the rigid support bar is arranged side by side with the anti-interference flexible circuit board, is used for reinforcing the bending form of the flexible bridge member, and physically connects the ear-hook component and the ear-bag component to bear mechanical tension.

Description

Anti-interference flexible circuit board, method and device of audio device with camera shooting function Technical Field The present invention relates to the field of application specific integrated circuits, and in particular, to an anti-interference flexible circuit board, method and apparatus for an audio device with a camera function. The invention relates to an anti-interference flexible Circuit board and a laminated structure thereof, which are suitable for Application-specific integrated circuits (Application SPECIFIC INTEGRATED circuits, application-specific integrated circuits (ASICs)) integrated in a wearable audio device with a camera function and peripheral interconnection structures thereof, and are specially optimized in structural design for hybrid transmission requirements of high-speed digital video signals, analog audio signals and control signals, in particular to a flexible Circuit board structure for providing stable signal transmission, electromagnetic shielding and reliable interconnection for the Application-specific integrated circuits in a narrow space. Background The bone conduction earphone can transmit audio information to a user and simultaneously keep the perception capability of surrounding environment sound due to the characteristic of 'double ears open', and is widely applied to sports, outdoor and safety sensitive scenes. Typical prior art is disclosed in chinese patent CN205336486U (a bone conduction wireless earphone), and its overall structure generally includes a back-hanging component, an ear-hanging component, and an ear-bag component disposed at the ear position. In existing bone conduction headset products, the electrical connection between the battery, bluetooth board and audio transducer is typically achieved by a plurality of circular wires that are independent of each other. For example, in the existing scheme, the rear hanging wire, the left wire and the right wire are often respectively arranged in a narrow gap between the metal support bar and the silica gel sleeve in a penetrating manner so as to complete power supply and audio signal transmission. The wire harness structure can meet the basic requirements of low-speed audio signals and direct-current power supplies, but the design premise of the wire harness structure does not consider the application scene of high-speed data transmission and coexistence of various signal types. With the development of wearable technology, the market is continuously increasing in demand for combining the "First Person View (FPV) shooting" function with the "high quality audio experience". However, if the imaging function is further integrated on the basis of the external shape and wearing structure of the existing bone conduction earphone, various technical challenges are faced, and the following aspects are mainly presented. First, in terms of space constraints and cabling, the ear-hook component of the bone conduction headset is typically designed as an elongated structure, often with a diameter of less than 5 millimeters, to compromise wear comfort and appearance requirements. The existing circular enamelled wire, stranded wire or parallel wire harness scheme is only suitable for low-speed signal and power transmission. When the camera module is introduced, a plurality of lines for transmitting high-speed digital video signals, such as differential signal lines for the MIPI interface, need to be additionally laid out. If the traditional wire harness mode is still adopted, the overall volume of the wire harness is obviously increased, and the wire harness is difficult to be arranged in the existing ear-hook cavity, so that the wire harness is difficult to be structurally realized. Second, a more critical issue is electromagnetic interference and common ground noise. In contrast to the camera module, which needs to transmit high-speed and high-frequency digital pulse signals in the working process, the rapid jump of the signal edge of the camera module can generate obvious high-frequency electromagnetic radiation, the audio transducer needs a large-current analog driving signal, and the microphone outputs an analog audio signal with extremely low amplitude. In a narrow linear space, if the signal lines with different properties are arranged in parallel, electromagnetic noise generated by the high-speed digital signal is easily coupled to the analog audio line in a crosstalk mode, so that obvious background noise or noise is formed on the auditory sense. In addition, prior designs commonly employ a common ground loop. When the audio transducer works, the high current flows in the ground wire to cause the ground potential fluctuation, and the high-frequency ground noise generated by the digital circuit of the camera is also overlapped in the same grounding network. Such common ground disturbances caused by the ground impedance not only deteriorate the pickup quality of the microphone, but may also adversely affect the stab