CN217825164U - Vehicle-mounted video output circuit, device and vehicle-mounted security device - Google Patents
Vehicle-mounted video output circuit, device and vehicle-mounted security device Download PDFInfo
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- CN217825164U CN217825164U CN202221286869.3U CN202221286869U CN217825164U CN 217825164 U CN217825164 U CN 217825164U CN 202221286869 U CN202221286869 U CN 202221286869U CN 217825164 U CN217825164 U CN 217825164U
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Abstract
The utility model provides an on-vehicle video output circuit, equipment and on-vehicle security protection equipment, wherein, on-vehicle video output circuit includes video processing circuit, digital analog conversion circuit and operational amplifier circuit, on-vehicle video output circuit is through adopting video processing circuit, digital analog conversion circuit and operational amplifier circuit realize video signal's conversion output, and simultaneously, video processing circuit confirms on-vehicle display device's resolution ratio information according to on-vehicle display device's resolution ratio information, and output corresponding resolution ratio regulating signal to digital analog conversion circuit and/or operational amplifier circuit, thereby the output corresponds to resolution ratio information's high definition video signal, the compatibility and the demonstration variety of on-vehicle display device and on-vehicle security protection equipment have been improved.
Description
Technical Field
The utility model belongs to the technical field of on-vehicle security protection, especially, relate to an on-vehicle video output circuit, equipment and on-vehicle security protection equipment.
Background
With the popularization and enhancement of safe driving, vehicle-mounted security equipment, such as a vehicle-mounted digital video recorder, a vehicle-mounted driving recorder and the like, is in operation, and the vehicle-mounted security equipment acquires corresponding driving road conditions and stores and plays data.
However, the display device used by the current vehicle-mounted security device only supports the input of the video data compatible with the low resolution, and when the display device with the low resolution is used, the display device cannot be compatible with the video data output by the video output device with the high resolution, so that the compatibility of the vehicle-mounted security device is greatly limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a vehicle-mounted video output circuit aims at solving traditional vehicle-mounted display equipment and has compatible low problem to the video data of different resolution ratios.
The embodiment of the utility model provides a first aspect provides a vehicle-mounted video output circuit, vehicle-mounted video output equipment is connected with vehicle-mounted display equipment, vehicle-mounted video output circuit includes video processing circuit, digital analog conversion circuit and operational amplifier circuit;
the video processing circuit, the digital-to-analog conversion circuit and the operational amplifier circuit are sequentially connected, the video processing circuit is also connected with the operational amplifier circuit, and the operational amplifier circuit is also used for connecting the vehicle-mounted display equipment;
the video processing circuit acquires resolution information of the vehicle-mounted display equipment through the digital-to-analog conversion circuit and the operational amplifier circuit, triggers and outputs a digital video signal to the digital-to-analog conversion circuit, and triggers and outputs a resolution adjusting signal to the digital-to-analog conversion circuit and/or the operational amplifier circuit;
the digital-to-analog conversion circuit receives the digital video signal output by the video processing circuit and the resolution adjusting signal and outputs an analog video signal with corresponding resolution to the operational amplifier circuit;
the operational amplifier circuit receives the analog video signal output by the digital-to-analog conversion circuit and the resolution adjusting signal, performs operational amplifier processing and resolution adjusting, and outputs a high-definition video signal with corresponding resolution to the vehicle-mounted display device.
Optionally, a first signal terminal of the video processing circuit and a first signal terminal of the digital-to-analog conversion circuit are connected and used for transmitting the digital video signal;
a second signal end of the video processing circuit is connected with a second signal end of the digital-to-analog conversion circuit and is used for transmitting the resolution adjusting signal and the resolution information of the vehicle-mounted display equipment;
the third signal end of the video processing circuit is connected with the controlled end of the operational amplifier circuit and is used for transmitting the resolution adjusting signal;
the third signal end of the digital-to-analog conversion circuit is connected with the first signal end of the operational amplifier circuit and is used for transmitting the analog video signal;
a fourth signal end of the digital-to-analog conversion circuit is connected with a second signal end of the operational amplifier circuit and is used for transmitting resolution information of the vehicle-mounted display equipment;
and the third signal end of the operational amplifier circuit is used for being connected with the signal end of the vehicle-mounted display equipment and transmitting the high-definition video signal and the resolution information of the vehicle-mounted display equipment.
Optionally, the video processing circuit includes a central processing unit, and a plurality of signal terminals of the central processing unit correspond to the first signal terminal, the second signal terminal, and the third signal terminal of the video processing circuit, respectively.
Optionally, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip, and a plurality of signal terminals of the digital-to-analog conversion chip respectively correspond to the first signal terminal, the second signal terminal, the third signal terminal, and the fourth signal terminal of the digital-to-analog conversion circuit.
Optionally, the operational amplifier circuit includes an operational amplifier chip, and a plurality of signal terminals of the operational amplifier chip respectively correspond to the first signal terminal, the second signal terminal, the third signal terminal, and the controlled terminal of the operational amplifier circuit.
Optionally, the central processing unit is connected to the digital-to-analog conversion chip through an I2C interface and configured to transmit the resolution adjustment signal and the resolution information of the vehicle-mounted display device.
Optionally, the central processing unit is connected to the signal terminal of the operational amplifier chip through a GPIO port.
The utility model discloses the second aspect of the embodiment provides a vehicle-mounted video output equipment, include as above vehicle-mounted video output circuit.
The utility model provides a third aspect provides an on-vehicle security protection equipment, on-vehicle display device including the adaptation connection and as above on-vehicle video output equipment.
Optionally, the vehicle-mounted security device includes at least one of a vehicle-mounted digital video recorder and a vehicle-mounted driving recorder.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the vehicle-mounted video output circuit adopts the video processing circuit, the digital-to-analog conversion circuit and the operational amplifier circuit to realize conversion output of video signals, and meanwhile, the video processing circuit determines resolution information of the vehicle-mounted display equipment according to the resolution information of the vehicle-mounted display equipment and outputs corresponding resolution adjusting signals to the digital-to-analog conversion circuit and/or the operational amplifier circuit, so that high-definition video signals corresponding to the resolution information are output, and the compatibility and display diversity of the vehicle-mounted display equipment and vehicle-mounted security equipment are improved.
Drawings
Fig. 1 is a schematic block diagram of a first module of a vehicle-mounted video output circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second module of the vehicle-mounted video output circuit according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a third module of the vehicle-mounted video output circuit according to the embodiment of the present invention;
fig. 4 is the embodiment of the utility model provides a module schematic diagram of on-vehicle security protection equipment.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The utility model provides a first aspect of the embodiment provides an on-vehicle Video output circuit 100, on-vehicle Video output equipment 1 is connected with on-vehicle display equipment 200, be used for the output to correspond to the High Definition Video signal to on-vehicle display equipment 200 resolution ratio, thereby make the Video signal of the different resolution ratios of on-vehicle display equipment 200 compatible on-vehicle Video output equipment 1, improve on-vehicle display equipment 200 and on-vehicle security protection equipment's compatibility, wherein, high Definition Video signal can be VGA (Video Graphics Array, video graphic Array) Video signal, AHD (Analog High Definition, simulation High resolution) Video signal etc., in order to improve display effect and signal transmission reliability, optionally, high Definition Video signal is AHD Video signal, wherein, AHD technique can realize the reliable transmission of ultra-long distance High Definition Video signal on existing simulation transmission line, and adopt advanced luminance signal and chrominance signal separation and simulation filtering technique, can reduce the color noise in High frequency district effectively, have better reducing image.
As shown in fig. 1, the vehicle-mounted video output circuit 100 includes a video processing circuit 10, a digital-to-analog conversion circuit 20, and an operational amplifier circuit 30, the video processing circuit 10, the digital-to-analog conversion circuit 20, and the operational amplifier circuit 30 are sequentially connected, the video processing circuit 10 is further connected with the operational amplifier circuit 30, and the operational amplifier circuit 30 is further used for connecting a vehicle-mounted display device 200;
the video processing circuit 10 acquires resolution information of the vehicle-mounted display device 200 through the digital-to-analog conversion circuit 20 and the operational amplifier circuit 30, and triggers and outputs a digital video signal to the digital-to-analog conversion circuit 20 and a resolution adjusting signal to the digital-to-analog conversion circuit 20 and/or the operational amplifier circuit 30;
the digital-to-analog conversion circuit 20 receives the digital video signal and the resolution adjustment signal output by the video processing circuit 10, and outputs an analog video signal with a corresponding resolution to the operational amplifier circuit 30;
the operational amplifier circuit 30 receives the analog video signal and the resolution adjustment signal output by the digital-to-analog conversion circuit 20, performs operational amplifier processing and resolution adjustment, and outputs a high-definition video signal with a corresponding resolution to the vehicle-mounted display device 200.
In this embodiment, the video processing circuit 10 is connected to the video data acquisition module, and acquires a corresponding video signal, and the video data acquisition module may be a camera, a high-speed camera, or the like, and simultaneously converts the video signal into a corresponding digital video signal, and the display resolution of the vehicle-mounted display device 200 is not matched with the analog signal of the current video data acquisition module and the video processing circuit 10, which results in the vehicle-mounted display device 200 being unable to normally display.
Therefore, when the vehicle-mounted display device 200 is plugged into the vehicle-mounted video output circuit 100, the video processing circuit 10 outputs an initial digital analog signal to the digital-to-analog conversion circuit 20, the digital-to-analog conversion circuit 20 performs digital-to-analog conversion and outputs an analog video signal to the operational amplifier circuit 30, the operational amplifier circuit 30 performs operational amplification processing on the analog video signal, such as mathematical operations of addition, subtraction, differentiation, integration and the like, and outputs a complete high-definition video signal to the vehicle-mounted display device 200, meanwhile, when the vehicle-mounted display device 200 is connected, resolution information of the vehicle-mounted display device 200 is coupled to the high-definition video signal and fed back to the operational amplifier circuit 30 in real time, the operational amplifier circuit 30 decouples the resolution information and feeds back the resolution information to the video processing circuit 10 through the digital-to-analog conversion circuit 20, and the operational amplifier circuit 30 output resolution adjustment signals, so that the finally output video signal is matched with the resolution information of the vehicle-mounted display device 200, thereby displaying corresponding video information, thereby increasing the compatibility of the resolution of the vehicle-mounted display device 200, and achieving the display device design that the display cost is reduced, for example, and the vehicle-mounted display device is not limited to the vehicle-mounted display device.
The resolution information of The vehicle-mounted display device 200 may be transmitted by coupling different types of signals with The high-definition video signal, and optionally, the resolution information of The vehicle-mounted display device 200 is coupled with The high-definition video signal by a UTC (Up The Coax) signal and is reversely transmitted to The video processing circuit 10, where The Coax is a communication mode that couples The resolution information to The high-definition video signal to realize transmission together. The high-definition video signal is connected to the vehicle-mounted display device 200, the vehicle-mounted display device 200 couples the resolution information in the vertical blanking period of the high-definition video signal, and the operational amplifier circuit 30 decouples the resolution information and feeds the resolution information back to the video processing circuit 10 through the digital-to-analog conversion circuit 20. Compared with the traditional communication mode, the method has the advantages that the resolution information is transmitted through the coaxial visual control, a special communication line is omitted, the cost is saved, and the reliability of the vehicle-mounted display device 200 is improved.
Optionally, as shown in fig. 2, the video processing circuit 10 includes a first signal end IO11, a second signal end IO12, and a third signal end IO13, the digital-to-analog conversion circuit 20 includes a first signal end IO21, a second signal end IO22, a third signal end IO23, and a fourth signal end IO24, the operational amplifier circuit 30 includes a first signal end IO31, a second signal end IO32, a third signal end IO33, and a controlled end Ctr, and the video processing circuit 10, the digital-to-analog conversion circuit 20, and the operational amplifier circuit 30 perform input and output of the digital video signal, the analog video signal, the resolution information, and the resolution adjustment signal through the signal end and the controlled end Ctr that are correspondingly connected.
The first signal end IO11 of the video processing circuit 10 and the first signal end IO21 of the digital-to-analog conversion circuit 20 are connected and used for transmitting digital video signals, the second signal end IO12 of the video processing circuit 10 is connected with the second signal end IO22 of the digital-to-analog conversion circuit 20 and used for transmitting resolution adjustment signals and resolution information of the vehicle-mounted display device 200, the third signal end IO13 of the video processing circuit 10 is connected with the controlled end Ctr of the operational amplifier circuit 30 and used for transmitting resolution adjustment signals, the third signal end IO23 of the digital-to-analog conversion circuit 20 is connected with the first signal end IO31 of the operational amplifier circuit 30 and used for transmitting analog video signals, the fourth signal end IO24 of the digital-to-analog conversion circuit 20 is connected with the second signal end IO32 of the operational amplifier circuit 30 and used for transmitting resolution information of the vehicle-mounted display device 200, and the third signal end IO33 of the operational amplifier circuit 30 is used for connecting with the signal end of the vehicle-mounted display device 200 and used for transmitting high-definition video signals and resolution information of the vehicle-mounted display device 200.
The video processing circuit 10 may adopt a corresponding processor, as shown in fig. 3, optionally, the video processing circuit 10 includes a central processing unit 11, and a plurality of signal terminals of the central processing unit 11 correspond to the first signal terminal IO11, the second signal terminal IO12, and the third signal terminal IO13 of the video processing circuit 10, respectively.
The digital-to-analog conversion circuit 20 may employ a corresponding digital-to-analog conversion unit, and optionally, the digital-to-analog conversion circuit 20 includes a digital-to-analog conversion chip 12, and a plurality of signal terminals of the digital-to-analog conversion chip 12 correspond to the first signal terminal IO21, the second signal terminal IO22, the third signal terminal IO23, and the fourth signal terminal IO24 of the digital-to-analog conversion circuit 20, respectively.
The operational amplifier circuit 30 may adopt a corresponding operational amplifier device, or the operational amplifier chip 13, and optionally, the operational amplifier circuit 30 includes the operational amplifier chip 13, and a plurality of signal terminals of the operational amplifier chip 13 respectively correspond to the first signal terminal IO31, the second signal terminal IO32, the third signal terminal IO33, and the controlled terminal Ctr of the operational amplifier circuit 30.
When the vehicle-mounted display device 200 is connected to the vehicle-mounted video output circuit 100 in an inserted manner, the central processing unit 11 outputs an initial digital analog signal to the digital-to-analog conversion chip 12 through the signal end, the digital-to-analog conversion chip 12 performs digital-to-analog conversion and outputs an analog video signal to the operational amplifier chip 13, the operational amplifier circuit 30 performs operational amplifier processing on the analog video signal and outputs a complete high-definition video signal to the vehicle-mounted display device 200, meanwhile, when the vehicle-mounted display device 200 is connected, resolution information of the vehicle-mounted display device 200 is immediately coupled to the high-definition video signal and fed back to the operational amplifier chip 13, the operational amplifier chip 13 decouples the resolution information and feeds back the high-definition information to the central processing unit 11 through the digital-to-analog conversion chip 12, the central processing unit 11 acquires resolution information of the current vehicle-mounted display device 200, and simultaneously outputs a resolution adjustment signal to at least one of the digital-to-analog conversion chip 12 and the operational amplifier chip 13, so that the resolution of the finally output video signal is matched with the resolution of the display device 200, thereby achieving the purpose of achieving the improvement of the compatibility of the display device display cost of the vehicle-mounted display device design, for achieving the single display device, for achieving the display device compatibility of the vehicle-mounted display device with the vehicle-mounted display device.
Optionally, as shown in fig. 3, the central processing unit 11 is connected to the digital-to-analog conversion chip 12 through an I2C interface and is configured to transmit the resolution adjusting signal and the resolution information of the on-vehicle display device 200, and the central processing unit 11 is connected to the operational amplifier chip 13 through a corresponding signal end and is configured to transmit the resolution adjusting signal and the resolution information of the on-vehicle display device 200, and optionally, the central processing unit 11 is connected to the signal end of the operational amplifier chip 13 through a GPIO port.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the vehicle-mounted video output circuit 100 realizes conversion output of video signals by adopting the video processing circuit 10, the digital-to-analog conversion circuit 20 and the operational amplifier circuit 30, meanwhile, the video processing circuit 10 determines resolution information of the vehicle-mounted display device 200 according to the resolution information of the vehicle-mounted display device 200 and outputs a corresponding resolution adjusting signal to the digital-to-analog conversion circuit 20 and/or the operational amplifier circuit 30, so that a high-definition video signal corresponding to the resolution information is output, and the compatibility and the display diversity of the vehicle-mounted display device 200 are improved.
As shown in fig. 4, the utility model discloses still provide a vehicle-mounted video output equipment 1, this vehicle-mounted video output equipment 1 includes vehicle-mounted video output circuit 100, and above-mentioned embodiment is referred to this vehicle-mounted video output circuit 100's concrete structure, because this vehicle-mounted video output equipment 1 has adopted all technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and here is not repeated once more.
The vehicle-mounted video output device 1 is connected with the vehicle-mounted display device 200 in an adaptive manner, and when the vehicle-mounted display device 200 is powered on, resolution information is fed back to the vehicle-mounted video output device 1, so that the vehicle-mounted video output device 1 adjusts the resolution of the analog video signal output by the vehicle-mounted video output device 1, and the resolutions of the video signals of the receiving party and the transmitting party are matched.
As shown in fig. 4, the utility model discloses still provide an on-vehicle security protection equipment, this on-vehicle security protection equipment includes adaptation connection's on-vehicle display device 200 and on-vehicle video output equipment 1, this on-vehicle video output equipment 1's concrete structure refers to above-mentioned embodiment, because this on-vehicle video output equipment 1 has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is not repeated here one by one.
In the vehicle-mounted security equipment, the vehicle-mounted video output equipment 1 is in adaptive connection with the vehicle-mounted display equipment 200, and when the vehicle-mounted display equipment 200 is powered on, resolution information is fed back to the vehicle-mounted video output equipment 1, so that the vehicle-mounted video output equipment 1 adjusts the resolution of analog video signals output by the vehicle-mounted video output equipment, and the resolutions of the video signals of the receiving and transmitting parties are matched.
The vehicle-mounted security device is used for recording, monitoring and the like, and corresponds to functions of the vehicle-mounted security device, optionally, the vehicle-mounted security device at least comprises one of a vehicle-mounted digital video recorder and a vehicle-mounted driving recorder.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A vehicle-mounted video output circuit is connected with a vehicle-mounted display device and is characterized by comprising a video processing circuit, a digital-to-analog conversion circuit and an operational amplifier circuit;
the video processing circuit, the digital-to-analog conversion circuit and the operational amplifier circuit are sequentially connected, the video processing circuit is also connected with the operational amplifier circuit, and the operational amplifier circuit is also used for connecting the vehicle-mounted display equipment;
the video processing circuit acquires resolution information of the vehicle-mounted display equipment through the digital-to-analog conversion circuit and the operational amplifier circuit, triggers and outputs a digital video signal to the digital-to-analog conversion circuit, and triggers and outputs a resolution adjusting signal to the digital-to-analog conversion circuit and/or the operational amplifier circuit;
the digital-to-analog conversion circuit receives the digital video signal output by the video processing circuit and the resolution adjusting signal and outputs an analog video signal with corresponding resolution to the operational amplifier circuit;
the operational amplifier circuit receives the analog video signal output by the digital-to-analog conversion circuit and the resolution adjusting signal, performs operational amplifier processing and resolution adjusting, and outputs a high-definition video signal with corresponding resolution to the vehicle-mounted display device.
2. The vehicular video output circuit according to claim 1, wherein the first signal terminal of the video processing circuit and the first signal terminal of the digital-to-analog conversion circuit are connected and configured to transmit the digital video signal;
a second signal end of the video processing circuit is connected with a second signal end of the digital-to-analog conversion circuit and is used for transmitting the resolution adjusting signal and the resolution information of the vehicle-mounted display equipment;
a third signal end of the video processing circuit is connected with a controlled end of the operational amplifier circuit and is used for transmitting the resolution adjusting signal;
the third signal end of the digital-to-analog conversion circuit is connected with the first signal end of the operational amplifier circuit and is used for transmitting the analog video signal;
a fourth signal end of the digital-to-analog conversion circuit is connected with a second signal end of the operational amplifier circuit and is used for transmitting resolution information of the vehicle-mounted display equipment;
and the third signal end of the operational amplifier circuit is used for being connected with the signal end of the vehicle-mounted display equipment and transmitting the high-definition video signal and the resolution information of the vehicle-mounted display equipment.
3. The vehicle-mounted video output circuit according to claim 2, wherein the video processing circuit comprises a central processing unit, and a plurality of signal terminals of the central processing unit correspond to the first signal terminal, the second signal terminal and the third signal terminal of the video processing circuit, respectively.
4. The vehicle-mounted video output circuit according to claim 3, wherein the digital-to-analog conversion circuit comprises a digital-to-analog conversion chip, and a plurality of signal terminals of the digital-to-analog conversion chip correspond to the first signal terminal, the second signal terminal, the third signal terminal and the fourth signal terminal of the digital-to-analog conversion circuit, respectively.
5. The vehicle-mounted video output circuit according to claim 3, wherein the operational amplifier circuit comprises an operational amplifier chip, and a plurality of signal terminals of the operational amplifier chip respectively correspond to the first signal terminal, the second signal terminal, the third signal terminal and the controlled terminal of the operational amplifier circuit.
6. The vehicle-mounted video output circuit according to claim 4, wherein the central processing unit is connected with the digital-to-analog conversion chip through an I2C interface and is used for transmitting the resolution adjustment signal and the resolution information of the vehicle-mounted display device.
7. The vehicle-mounted video output circuit according to claim 5, wherein the central processing unit is connected with the signal end of the operational amplifier chip through a GPIO port.
8. An in-vehicle video output apparatus characterized by comprising the in-vehicle video output circuit according to any one of claims 1 to 7.
9. An on-vehicle security device, characterized by comprising an on-vehicle display device and the on-vehicle video output device of claim 8, which are adapted to be connected.
10. The vehicle security device of claim 9, wherein the vehicle security device comprises at least one of a vehicle digital video recorder and a vehicle tachograph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286869.3U CN217825164U (en) | 2022-05-26 | 2022-05-26 | Vehicle-mounted video output circuit, device and vehicle-mounted security device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221286869.3U CN217825164U (en) | 2022-05-26 | 2022-05-26 | Vehicle-mounted video output circuit, device and vehicle-mounted security device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217825164U true CN217825164U (en) | 2022-11-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221286869.3U Active CN217825164U (en) | 2022-05-26 | 2022-05-26 | Vehicle-mounted video output circuit, device and vehicle-mounted security device |
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| Country | Link |
|---|---|
| CN (1) | CN217825164U (en) |
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2022
- 2022-05-26 CN CN202221286869.3U patent/CN217825164U/en active Active
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