USB connector and device for vision protection device

Abstract

The present invention provides a USB connector and device for a vision protection device, the vision protection device comprising a device body and the USB connector, the device body being used to be installed on the back of a mobile terminal; wherein the plug end is arranged in the USB plug, and the socket end is arranged in the USB socket; the interface circuit board passes through the through hole of the fixing member; the first end of the planar cable is welded to the surface of the interface circuit board, the welding position is located between the socket end and the plug end, and the welding position is in close contact with the inner wall of the through hole of the fixing member; the outer shell is sleeved on the fixing member, the boss extends into the notch, and the planar cable extends from the welding position along the side wall of the through hole of the fixing member and extends from the gap between the mating surfaces of the boss and the notch; the present invention can improve the practicality of the vision protection device.

Description

Technical Field

[0001] The present invention relates to the technical field of peripheral products applied to mobile terminals, and in particular to a USB connector and a device for vision protection. Background Art

[0002] With the increasing prevalence of mobile devices like computers, cell phones, and televisions, more and more people are experiencing eye discomfort symptoms such as visual fatigue, eye irritation, red eyes, and blurred vision. A key cause of these symptoms is prolonged use of electronic devices in an environment where the screen brightness is higher than the background brightness. This creates a bright area on the screen side of the device, but dark areas on the back and periphery of the screen. This creates a disharmony between the screen brightness and the background brightness of the device. Because in this environment, the user's pupil size, which adjusts to the background environment, is not adapted to the display brightness, staring at the display for extended periods of time can easily lead to visual fatigue, affecting visual health.

[0003] Patent document CN108986750A discloses a background lighting device for an information terminal, which proposes setting up a background lighting device outside the information terminal. The device obtains power from the USB interface of the information terminal and provides additional background light through the LED lamp in the background lighting device to protect the user's eyesight.

[0004] This patent document proposes the concept of a vision protection device, but does not provide any solution on how to make the vision protection device more practical and more suitable for mobile terminals. Summary of the Invention

[0005] Based on the above situation, the main purpose of the present invention is to provide a connector and device for a vision protection device to improve the practicality of the vision protection device.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A USB connector for a vision protection device, the device comprising a device body and a USB connector, the device body being adapted to be mounted on the back of a mobile terminal, the USB connector being connected to the device body and adapted to connect to a USB port of the mobile terminal; the USB connector comprising a flat cable and an interface; the interface comprising an interface circuit board, a USB plug, a USB receptacle, and a housing; the interface circuit board having a plug end and a receptacle end; the housing comprising an overall cylindrical outer shell and a fixing member, the fixing member having a boss on one side thereof and a notch on one side thereof mating with the boss; the plug end being disposed within the USB plug, and the receptacle end being disposed within the USB receptacle; the interface circuit board extending through a through hole in the fixing member; a first end of the flat cable being welded to a surface of the interface circuit board, the welding position being located between the receptacle end and the plug end, and the welding position being located within the through hole in the fixing member; the housing being sleeved over the fixing member, the boss extending into the notch, and the flat cable extending from the welding position along the sidewall of the through hole in the fixing member and out of the gap between the mating surfaces of the boss and the notch.

[0008] Preferably, the USB socket is arranged on the end surface of the fixing member close to the socket end and is integrally formed with the fixing member.

[0009] Preferably, the interface further comprises a magnetic component, and the magnetic component is sleeved on the USB socket.

[0010] Preferably, the second end of the flat cable is soldered to a surface of the circuit board of the device body away from the back of the mobile terminal.

[0011] Preferably, the USB connector further comprises an interface electronic component, which is disposed on a circuit board of the device body and comprises a PNP transistor and a first resistor; the planar cable comprises a power line, a ground line, a first channel configuration line, and a second channel configuration line, with a second end of the planar cable being connected to the interface electronic component of the device body; the plug end comprises a first power end, a first ground end, and a first channel configuration end; the socket end comprises a second power end, a second ground end, and a second channel configuration end; the first power end and the second power end are electrically connected, the first ground end and the second ground end are electrically connected, the first power end and the second power end are electrically connected to the power end of the circuit board via the power line, and the first ground end and the second ground end are electrically connected to the ground end of the circuit board via the ground line; the first channel configuration end is electrically connected to the emitter of the PNP transistor via the first channel configuration line, the base of the PNP transistor is electrically connected to the ground end of the circuit board via the first resistor, and the collector of the PNP transistor is electrically connected to the ground end of the circuit board; and the second channel configuration end is connected to the base of the PNP transistor via the second channel configuration line.

[0012] Preferably, the interface electronic component further includes a second resistor and a third resistor, and the second resistor and the third resistor are arranged on the circuit board; the second channel configuration end is connected to the first end of the second resistor through the second channel configuration line, and the second end of the second resistor is electrically connected to the ground end of the circuit board through the first resistor; the collector of the PNP transistor is electrically connected to the ground end of the circuit board through the third resistor.

[0013] The present invention also provides a vision protection device, including a device body and the USB connector, the device body including a circuit board, and a photoelectric sensor and a light-emitting element arranged on the circuit board; the second end of the planar cable is welded to the circuit board; the photoelectric sensor is used to detect the background environment brightness of the mobile terminal; and the light-emitting element is used to change the background environment brightness.

[0014] Preferably, the welding position of the second end of the planar cable is located on the same surface of the circuit board as the photoelectric sensor and the light-emitting element, and the second end of the planar cable is welded to the edge of the circuit board close to the USB socket of the mobile terminal.

[0015] Preferably, the device body also includes a device shell and a transparent filling material, and the device shell is provided with a light-collecting hole groove and a light-emitting hole groove; the photoelectric sensor and the light-emitting element are arranged on the front of the circuit board, and the device shell wraps the front of the circuit board; the photoelectric sensor is arranged below the light-collecting hole groove, and the light-emitting element is arranged below the light-emitting hole groove; the transparent filling material is respectively filled in the light-collecting hole groove and the light-emitting hole groove.

[0016] Preferably, the light-emitting element includes two LED columns, each LED column includes multiple LEDs; the two LED columns are respectively located on both sides of the photoelectric sensor, and the multiple diodes in each LED column are arranged along the length direction of the planar wiring.

[0017] Beneficial effects:

[0018] By adopting the above-mentioned interface structure in combination with the flat cable, under the premise of a certain assembly and manufacturing complexity, it is possible to ensure that the flat cable is stably fixed to the interface, and to maximize the guarantee that the bending degree of the flat cable is small when the vision protection device is installed on the back of the mobile terminal, thereby avoiding the problem of easy breakage due to excessive bending, thereby improving the practicality of the vision protection device.

[0019] In addition, when the USB plug of the interface is connected to the mobile terminal and the USB socket is not connected to the charging device, the vision protection device can obtain power from the mobile device through the USB plug; when the USB socket of the interface is further connected to the charging device, the charging device can charge the mobile terminal and the vision protection device through the interface. While using the vision protection device, the power of the mobile terminal is also guaranteed, thereby improving the practicality of the vision protection device; since the interface electronic components are arranged on the circuit board of the device body, the problems of increased interface volume and increased manufacturing difficulty caused by setting electronic components on a smaller interface circuit board are avoided.

[0020] Other beneficial effects of the present invention will be explained through the introduction of specific technical features and technical solutions in the specific implementation methods. Those skilled in the art should be able to understand the beneficial technical effects brought about by the introduction of these technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of a vision protection device according to a preferred embodiment of the present invention installed on a mobile terminal;

[0023] Figure 2 yes Figure 1Schematic diagram of the vision protection device;

[0024] Figure 3 yes Figure 2 Exploded view of the eye protection device;

[0025] Figure 4 FIG. 4 is a partial circuit diagram of a vision protection device including an interface circuit according to a preferred embodiment of the present invention.

[0026] The reference numerals are as follows:

[0027] Device body 10

[0028] Device housing 11

[0029] Light hole slot 111

[0030] Lighting slot 112

[0031] Photoelectric sensor 20

[0032] Light-emitting element 30

[0033] Flat cable 40

[0034] First end 401

[0035] Second end 402

[0036] Interface 50

[0037] USB plug 51

[0038] USB socket 52

[0039] Interface circuit board 53

[0040] Socket end 531

[0041] Plug end 532

[0042] Fixing 54

[0043] Boss 541

[0044] Shell 55

[0045] Gap 551

[0046] mating surface 552

[0047] Magnetic component 56

[0048] Mobile terminal 200

[0049] Circuit board 60 DETAILED DESCRIPTION

[0050] Figure 1FIG is a schematic diagram of a vision protection device according to an embodiment of the present invention installed on a mobile terminal 200. Figure 1 As shown, the eyesight protection device includes a device body 10 and a USB connector.

[0051] The device body 10 is used to be installed on the back of the mobile terminal 200, for example, by adhesion, magnetism, etc. It can be the back of the mobile terminal 200 itself, or the back of a protective cover of the mobile terminal 200. The device body 10 is mainly used to detect the background environment brightness of the mobile terminal 200 and compensate for the background environment brightness. The device body 10 includes a device housing 11, a circuit board 60, and functional electronic components arranged on the circuit board 60. The functional electronic components include a photoelectric sensor 20 for detecting the background environment brightness of the mobile terminal 200, and a light-emitting element 30 for changing the background environment brightness, such as a light-emitting element 30 (such as an LED) that emits a corresponding light intensity according to the background environment brightness. For example, when the light intensity detected by the photoelectric sensor 20 is less than a certain threshold, the light-emitting element 30 is controlled to emit light, thereby increasing the brightness of the background environment and protecting the user's eyesight.

[0052] Further references Figure 2 and 3 The USB connector includes an interface 50, a flat cable 40 and an interface electronic component 601, which is disposed on a circuit board 60 of the device body 10. The interface 50 includes a housing, an interface circuit board 53, a USB plug 51 and a USB socket 52.

[0053] The housing includes an outer shell 55, which is generally cylindrical in shape, and a fixing member 54. Specifically, both the outer shell 55 and the fixing member 54 have through-holes oriented along the insertion and removal direction of the interface 50. A boss 541 is provided on one side of the fixing member 54. This boss 541 can be roughly cubical in shape. Preferably, the boss 541 is provided on the surface of the fixing member 54 near the back of the mobile terminal 200. A USB socket 52 is provided on the outer end surface of the fixing member 54. Preferably, the USB socket 52 and the fixing member 54 are integrally formed, for example, both the fixing member 54 and the USB socket 52 are made of plastic and formed integrally using a plastic molding process. A notch 551 is provided on one side of the outer shell 55 to mate with the boss 541. The interface circuit board 53 passes through the through-hole of the fixing member 54, with the plug end 532 and the socket end 531 both located outside the through-hole of the fixing member 54. The plug end 532 is disposed within the USB plug 51, and the socket end 531 is disposed within the USB socket 52.

[0054] The flat cable 40 provides a power supply channel from the mobile terminal for the vision protection device and furthermore, provides USB communication with the mobile terminal 200. The first end 401 of the flat cable 40 is soldered to the surface of the interface circuit board 53. The soldering position is located between the socket end 531 and the plug end 532. The soldering position is in close contact with the inner wall of the through-hole of the fixing member 54, thereby further securing the first end of the flat cable 40 at the soldering position. The housing 55 is sleeved on the fixing member 54, and the boss 541 extends into the notch 551, forming a tight fit between the boss 541 and the notch 551. The flat cable 40 extends from the soldering position along the side wall of the through-hole of the fixing member 54 and out of the gap between the mating surfaces of the boss 541 and the notch 551. The tight fit between the boss 541 and the notch 551 compresses the flat cable 40. The mating surface 552 is the widthwise surface of the columnar shape of the housing 55. Preferably, the width of the notch 551 and the boss 541 is set to be the same as the width of the planar cable 40, so that the mating surfaces of the notch 551 and the boss 541 can stably fix the planar cable 40 without leaving a gap of the thickness of the planar cable 40 between the mating surfaces.

[0055] By adopting the above-mentioned interface structure in combination with the flat cable 40, under the premise of a certain assembly and manufacturing complexity, it is possible to ensure that the flat cable 40 is stably fixed to the interface 50, and to maximize the guarantee that the bending degree of the flat cable is small when the vision protection device is installed on the back of the mobile terminal, thereby avoiding the problem of easy breakage due to excessive bending.

[0056] The above-mentioned USB plug 51 and USB socket 52 can adopt a USB type that supports charging role conversion, that is, it has a channel configuration terminal (CC terminal) for the connected USB device to detect, so that the device can decide whether to operate in discharge mode or charging mode. For example, the above-mentioned USB plug 51 and USB socket 52 can adopt Micro USB, TYPE-C USB, etc.

[0057] Furthermore, the USB plug 51 utilizes a Type-C USB connector, and the USB receptacle 52 utilizes a Micro USB connector. Specifically, the plug end 532 of the interface circuit board 53 includes a first power terminal, a first ground terminal, and a first channel configuration terminal (CC terminal); the receptacle end 531 includes a second power terminal, a second ground terminal, and a second channel configuration terminal (CC terminal). To ensure that the mobile terminal 200 can power the vision protection device when the charging device is not charging the USB interface 50, and that the mobile terminal 200 stops powering the vision protection device when the charging device is charging the USB interface 50, and that the charging device only powers both the mobile terminal 200 and the vision protection device, the following solution is further employed: the flat cable 40 includes a power line, a ground line, a first channel configuration line, and a second channel configuration line. The interface electronic components 601 include a PNP transistor Q1-A, a first resistor R8, and a second resistor R9. To reduce the size and complexity of the USB interface 50, the PNP transistor Q1-A, the first resistor R8, and the second resistor R9 are disposed on the circuit board 60.

[0058] like Figure 4 As shown, the first power terminal and the second power terminal are electrically connected via a copper wiring layer on the interface circuit board 53. The first ground terminal and the second ground terminal are electrically connected via a copper wiring layer on the interface circuit board 53. The first power terminal and the second power terminal are electrically connected to the power terminal of the circuit board 60 via a power line. The first ground terminal and the second ground terminal are electrically connected to the ground terminal of the circuit board 60 via a ground line. The first channel configuration terminal is electrically connected to the emitter of the PNP transistor Q1-A via a first channel configuration line. The base of the PNP transistor Q1-A is electrically connected to the ground terminal of the circuit board 60 via a first resistor R8. The collector of the PNP transistor Q1-A is electrically connected to the ground terminal of the circuit board 60. The second channel configuration terminal is electrically connected to the collector of the PNP transistor Q1-A via a second channel configuration line.

[0059] When the USB plug 51 of the USB interface 50 is inserted into the USB socket of the mobile terminal 200 and the charging device is not connected to the USB interface 50, the power terminal, channel configuration terminal (CC terminal) and ground terminal of the USB socket of the mobile terminal 200 are respectively in contact and electrically connected with the first power terminal, first channel configuration terminal and first ground terminal of the USB interface 50. According to the USB protocol, the power supply end of the mobile terminal 200 does not supply power at this time; the channel configuration end (CC end) of the mobile terminal 200 is connected to the high level through the pull-up resistor in the mobile terminal 200, so the channel configuration end (CC end) outputs a high level. Since the second channel configuration end is floating at this time, the base of the PNP transistor Q1-A is at a low level, so the PNP transistor Q1-A is turned on, and the emitter of the PNP transistor Q1-A is pulled to a low level, that is, the first channel configuration end is pulled to a low level. Since the channel configuration end (CC end) of the mobile terminal 200 is electrically connected to the first channel configuration end, the channel configuration end (CC end) of the mobile terminal 200 is also at a low level. After the mobile terminal 200 detects that its own channel configuration end (CC end) is at a low level, it outputs power from the power supply end of its own USB socket, so that the vision protection device can obtain power from the first power supply end.

[0060] When the USB plug 51 of the USB interface 50 is inserted into the USB socket of the mobile terminal 200, the USB charging plug of the charging device is inserted into the USB socket 52 of the USB interface 50. At this time, the power terminal, channel configuration terminal (CC terminal) and ground terminal in the USB charging plug are respectively in contact with and electrically connected to the second power terminal, second channel configuration terminal and second ground terminal of the USB interface 50. According to the USB protocol, the power supply end of the charging device always supplies power to the outside. The channel configuration end (CC end) of the USB charging plug of the charging device is connected to the high level through an internal pull-up resistor. Therefore, the channel configuration end (CC end) outputs a high level, so the second channel configuration end is also a high level. Since the first channel configuration end is also a high level, the PNP transistor Q1-A is turned off, and the emitter of the PNP transistor Q1-A is still a high level, that is, the first channel configuration end is still a high level. Therefore, the channel configuration end (CC end) of the mobile terminal 200 is also a high level. After the mobile terminal 200 detects that its own channel configuration end (CC end) is high, it controls the power supply end of its own USB socket to stop supplying power, so that the power output from the power supply end in the USB charging plug is transmitted to the vision protection device via the second power supply end.

[0061] Through the above solution, while using the vision protection device, the charging device can charge the mobile terminal 200 and the vision protection device through the USB interface 50. In addition, since the interface electronic component 601 is arranged on the circuit board 60 of the device body 10, the volume of the USB interface 50 will not be increased.

[0062] Furthermore, the interface electronic component 601 further includes a second resistor R9, the second channel configuration end is connected to the first end of the second resistor R9 through a second channel configuration line, and the second end of the second resistor R9 is electrically connected to the ground end of the circuit board 60 through the first resistor R8.

[0063] Furthermore, the interface electronic component 601 also includes a third resistor R2, and a third resistor R2 is also provided on the circuit board 60. The collector of the PNP transistor Q1-A is electrically connected to the ground terminal of the circuit board 60 through the third resistor R2 to limit the current flowing through the PNP transistor Q1-A.

[0064] Furthermore, the flat cable 40 may also include a first data line (e.g., D+) and a second data line (e.g., D-). The plug end 532 also includes a first data line (e.g., D+) and a second data line (e.g., D-), and the socket end 531 also includes a third data line (e.g., D+) and a fourth data line (e.g., D-). The first data line (e.g., D+) and the third data line (e.g., D+) are electrically connected via a copper wire layer on the interface circuit board 53. The first data line (e.g., D+) and the third data line (e.g., D+) are electrically connected to a fifth data line (e.g., D+) on the circuit board 60. The second data line (e.g., D-) and the fourth data line (e.g., D-) are electrically connected via a copper wire layer on the interface circuit board 53. The second data line (e.g., D-) and the fourth data line (e.g., D-) are electrically connected to a sixth data line (e.g., D-) on the circuit board 60. In this way, the mobile terminal 200 can communicate with the vision protection device through the interface 50, as well as with a USB device connected to the USB socket 52 of the interface 50.

[0065] Furthermore, the second end 402 of the flat cable 40 is soldered to the surface of the circuit board 60 away from the back of the mobile terminal 200. That is, the soldering position of the second end 402 of the flat cable 40 is soldered to the surface of the circuit board 60 away from the back of the mobile terminal 200, and the photoelectric sensor 20 and the light-emitting element 30 are located on the same surface of the circuit board 60. In this way, the device body 10 can be installed more flatly on the back of the mobile terminal 200.

[0066] Furthermore, the interface 50 includes a cylindrical magnetic component 56 (e.g., a strong magnet), which is mounted on the USB receptacle 52. This allows a magnetic charging plug to be connected to the USB receptacle 52 of the interface 50 to simultaneously charge the mobile terminal 200 and the vision protection device. Furthermore, the second end 402 of the flat cable 40 is soldered to the edge of the circuit board 60 near the USB receptacle of the mobile terminal 200. This reduces the length of the flat cable 40 and allows for a flatter installation on the back of the mobile terminal 200.

[0067] Furthermore, the device housing is provided with a light-collecting aperture 112 and a light-emitting aperture 111, which can be holes or slots. A photoelectric sensor 20 and a light-emitting element 30 are provided on the front of the circuit board 60, and the device housing 11 wraps around the front of the circuit board 60. The photoelectric sensor 20 is provided below the light-collecting aperture 112, and the light-emitting element 30 is provided below the light-emitting aperture 111. In this way, the device housing 11 not only protects the circuit board 60 and the electronic components thereon, but also blocks light from the light-emitting element 30 from directly entering the photoelectric sensor 20, thereby preventing inaccurate background light brightness detection by the photoelectric sensor 20.

[0068] Furthermore, the light-emitting element 30 includes two LED arrays, each including multiple LEDs. The two LED arrays are located on either side of the photosensor 20, with the multiple diodes in each array arranged along the length of the flat cable 40. This allows for more even illumination of the background environment on both sides of the photosensor 20. Furthermore, because the USB socket of the mobile terminal 200 is typically located on the lower short side, the light reflected by the light-emitting element 30 toward the background environment is less likely to be blocked by the back of the mobile terminal 200 and thus prevented from entering the user's eyes.

[0069] Furthermore, the device body also includes a transparent filling material (not shown in the figure), which is respectively filled in the light hole groove 112 and the light outlet hole groove 111. In this way, it can ensure that light can pass through smoothly and also enhance the strength of the device body.

[0070] Those skilled in the art will appreciate that, provided there is no conflict, the above preferred solutions can be freely combined and superimposed.

[0071] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A USB connector for a vision protection device, the vision protection device comprising a device body and the USB connector, the device body being mounted on the back of a mobile terminal, the USB connector being connected to the device body, and the USB connector being connected to a USB port of the mobile terminal; characterized in that: The USB connector includes a flat cable and an interface; The interface includes an interface circuit board, a USB plug, a USB socket, and a housing; the interface circuit board is provided with a plug end and a socket end; the housing includes an overall cylindrical shell and a fixing member, one side surface of the fixing member is provided with a boss, and one side of the shell is provided with a notch that cooperates with the boss; The plug end is arranged in the USB plug, and the socket end is arranged in the USB socket; The interface circuit board passes through the through hole of the fixing member; the first end of the flat cable is welded to the surface of the interface circuit board, the welding position is located between the socket end and the plug end, and the welding position is located in the through hole of the fixing member; The shell is sleeved on the fixing part, the boss extends into the notch, and the planar cable extends from the welding position along the side wall of the through hole of the fixing part and out of the gap between the matching surfaces of the boss and the notch. The tight fit between the boss and the notch presses the planar cable tightly.

2. The USB connector according to claim 1, wherein: The USB socket is arranged on the end surface of the fixing member close to the socket end and is integrally formed with the fixing member.

3. The USB connector according to claim 2, wherein: The interface further comprises a magnetic component, and the magnetic component is sleeved on the USB socket.

4. The USB connector according to claim 1, wherein: The second end of the flat cable is welded to a surface of the circuit board of the device body away from the back of the mobile terminal.

5. The USB connector according to any one of claims 1 to 4, wherein: The USB connector further comprises an interface electronic component, which is arranged on a circuit board of the device body and comprises a PNP transistor and a first resistor; The flat cable includes a power line, a ground line, a first channel configuration line, and a second channel configuration line, and the second end of the flat cable is connected to the interface electronic component of the device body; The plug end includes a first power supply end, a first ground end and a first channel configuration end; the socket end includes a second power supply end, a second ground end and a second channel configuration end; The first power terminal and the second power terminal are electrically connected, the first ground terminal and the second ground terminal are electrically connected, the first power terminal and the second power terminal are electrically connected to the power terminal of the circuit board through the power line, and the first ground terminal and the second ground terminal are electrically connected to the ground terminal of the circuit board through the ground line; The first channel configuration terminal is electrically connected to the emitter of the PNP transistor through the first channel configuration line, the base of the PNP transistor is electrically connected to the ground of the circuit board through the first resistor, and the collector of the PNP transistor is electrically connected to the ground of the circuit board; The second channel configuration terminal is connected to the base of the PNP transistor through the second channel configuration line.

6. The USB connector according to claim 5, wherein: The interface electronic component further includes a second resistor and a third resistor, wherein the second resistor and the third resistor are arranged on the circuit board; The second channel configuration end is connected to the first end of the second resistor through the second channel configuration line, and the second end of the second resistor is electrically connected to the ground end of the circuit board through the first resistor; The collector of the PNP transistor is electrically connected to the ground terminal of the circuit board through the third resistor.

7. A vision protection device, comprising a device body and a USB connector according to any one of claims 1 to 6, characterized in that: The device body includes a circuit board, and a photoelectric sensor and a light-emitting element arranged on the circuit board; The second end of the planar cable is welded to the circuit board; The photoelectric sensor is used to detect the background brightness of the mobile terminal; The light emitting element is used to change the brightness of the background environment.

8. The eyesight protection device according to claim 7, wherein: The welding position of the second end of the flat cable is located on the same surface of the circuit board as the photoelectric sensor and the light emitting element. The second end of the flat cable is welded to the edge of the circuit board close to the USB socket of the mobile terminal.

9. The eyesight protection device according to claim 7 or 8, characterized in that: The device body also includes a device shell and a transparent filling material, and the device shell is provided with a light-collecting hole slot and a light-emitting hole slot; The photoelectric sensor and the light-emitting element are arranged on the front side of the circuit board, and the device housing wraps the front side of the circuit board; The photoelectric sensor is arranged below the light-collecting hole groove, and the light-emitting element is arranged below the light-emitting hole groove; the transparent filling material is filled in the light-collecting hole groove and the light-emitting hole groove respectively.

10. The eyesight protection device according to claim 7, wherein: The light emitting element includes two light emitting diode columns, each light emitting diode column includes a plurality of light emitting diodes; The two LED columns are respectively located on two sides of the photoelectric sensor, and a plurality of diodes in each LED column are arranged along the length direction of the planar wiring.

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