A back clip

Abstract

The present invention discloses a back clip that can be mounted under a mobile terminal. The back clip includes a housing and an eye-tracking device. The housing is configured to be mounted on the mobile terminal, and the eye-tracking device is mounted under the housing and connected to the mobile terminal through the housing. This solution allows the eye-tracking device to be externally mounted on the mobile terminal via the back clip. This allows users to enable eye-tracking functionality on their mobile terminal without having to replace the mobile terminal, thus satisfying their need to experience eye-tracking technology and reducing unnecessary financial waste.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile terminals, and in particular to a back clip. Background Art

[0002] Eye tracking technology, also known as gaze tracking technology, is a technology that estimates the eye's line of sight and / or gaze point by collecting eye movements.

[0003] Devices equipped with eye tracking technology are called eye tracking devices.

[0004] In the prior art, a mobile terminal has an eye tracking function by having an eye tracking device built into the mobile terminal. However, if the mobile terminal does not have an eye tracking device built into the mobile terminal before leaving the factory, the mobile terminal cannot have the eye tracking function.

[0005] At this point, if the user wants to experience a mobile terminal with eye tracking technology, the only option is to replace the mobile terminal.

[0006] Therefore, how to make the mobile terminal meet the user's needs for experiencing eye tracking technology without replacing the mobile terminal has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides a back clip, so that the mobile terminal can meet the user's needs of experiencing eye tracking technology without replacing the mobile terminal.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A back clip, suitable for a mobile terminal, comprising:

[0010] A housing capable of being mounted on a mobile terminal;

[0011] An eye tracking device is mounted on the housing and can be connected to a transmission interface of the mobile terminal via a transmission interface.

[0012] Preferably, in the above-mentioned back clip, the shell includes:

[0013] A front housing capable of being mounted on the mobile terminal;

[0014] The rear shell is connected to the front shell, and the eye tracking device is installed between the rear shell and the front shell.

[0015] Preferably, in the above-mentioned back clip, the rear shell includes a lower rear shell, an upper rear shell and a locking assembly, the lower rear shell is movably connected to the upper rear shell in an up-and-down manner, and the locking assembly is used to achieve a fixed connection between the lower rear shell and the upper rear shell;

[0016] The front shell includes a lower front shell and an upper front shell, the lower front shell is connected to the lower rear shell, and the upper front shell is connected to the upper rear shell.

[0017] Preferably, in the above-mentioned back clip, a guide block is provided at the upper end of the lower rear shell, the front surface of the guide block is flush with the front surface of the lower rear shell, and the thickness of the guide block is smaller than the thickness of the lower rear shell;

[0018] Both ends of the upper rear shell are provided with guard edges, and a guard rod parallel to the guard edges is provided between the two guard edges. A guide groove is formed between the guard edges and the adjacent guard rods or between adjacent guard rods. The guide groove is slidably matched with the guide block, and the rear surface of the upper rear shell is flush with the rear surface of the lower rear shell.

[0019] Preferably, in the above-mentioned back clip, a limiting groove is provided on the lower rear shell, located between adjacent guide blocks, and a first guiding inclined surface is provided at the bottom of the limiting groove;

[0020] A limiting post is provided on the lower end surface of the upper rear shell, corresponding to the position of the retaining edge or the shift lever, the limiting post cooperates with the limiting groove, and the limiting post is provided with a second guiding inclined surface that cooperates with the first guiding inclined surface;

[0021] A stopper is provided on the front surface of the upper rear shell, which can abut against an end of the guide block away from the lower rear shell.

[0022] Preferably, in the above-mentioned back clip, a first bolt hole is provided on the limiting column, and the upper front shell is connected to the limiting column via a first bolt that cooperates with the first bolt hole;

[0023] The lower rear shell is provided with a second bolt hole, and the lower front shell is connected to the lower rear shell via a second bolt that matches the second bolt hole.

[0024] Preferably, in the above-mentioned back clip, a hinge shaft is provided at one end of the guide block away from the lower rear shell;

[0025] The retaining edge or the shift rod is provided with a sliding groove matched with the hinge shaft, and the limiting column is provided with a hinge groove matched with the hinge shaft.

[0026] Preferably, in the above-mentioned back clip, the locking assembly includes:

[0027] a first connecting post, disposed at a lower end of the front surface of the lower rear shell;

[0028] a second connecting post, provided on the upper end of the front surface of the upper rear shell;

[0029] An elastic member, one end of which is connected to the first connecting post, and the other end of which is connected to the second connecting post.

[0030] Preferably, in the above-mentioned back clip, the front surface of the lower front shell is provided with a first slot, into which the lower end of the mobile terminal can be inserted, and the first slot is provided with a first hole on a first side wall perpendicular to the front surface of the lower front shell for cooperating with a button of the mobile terminal;

[0031] The front surface of the upper front shell is provided with a second slot, which can be inserted into the upper end of the mobile terminal. The second side wall of the second slot, which is perpendicular to the front surface of the upper front shell, is provided with a second hole that matches the socket of the mobile terminal.

[0032] Preferably, in the above-mentioned back clip, the front surface of the lower front shell is provided with a first front shell for mounting the eye tracking device, which is located below the first slot, and the front surface and the rear surface of the first front shell are both open ends;

[0033] The lower end of the lower rear shell can block the rear surface of the first front shell.

[0034] Preferably, in the above-mentioned back clip, the eye tracking device includes:

[0035] An image collector connected to the transmission interface;

[0036] a first infrared filter, mounted on the front surface of the first front housing;

[0037] A first infrared light emitter, wherein a first mounting hole is provided on the first infrared light emitter for the image collector to pass through;

[0038] A fixed bracket connected to the first rear cover plate,

[0039] The rear surface of the fixing bracket is connected to the image collector, and the fixing bracket is provided with a second mounting hole corresponding to the position of the first mounting hole.

[0040] The front surface of the fixing bracket is connected to the first infrared light emitter. The fixing bracket is provided with a power supply for supplying power to the first infrared light emitter. The power supply is connected to the transmission interface.

[0041] Preferably, in the above-mentioned back clip, the eye tracking device further comprises:

[0042] a second infrared light emitter, disposed at the upper end of the housing and connected to the power supply via a wire;

[0043] The second infrared filter is arranged at the upper end of the shell and located on the front surface of the upper front shell.

[0044] Preferably, in the above-mentioned back clip, a second front shell is provided at the upper end of the upper front shell, and the front surface and the rear surface of the second front shell are both open ends.

[0045] The front surface of the second front shell is blocked by a second infrared filter, and the rear surface of the second front shell is blocked by an upper rear shell.

[0046] Preferably, in the above-mentioned back clip, the transmission interface is a type-c interface, and the type-c interface is connected to the lower rear shell through a mounting bracket.

[0047] The mounting bracket includes:

[0048] a first connecting plate connected to the rear housing;

[0049] The second connecting plate is perpendicular to the first connecting plate and is connected to the type-c interface.

[0050] Preferably, in the above-mentioned back clip, the mounting bracket further includes a wire pressing plate, the wire pressing plate is connected to the first connecting plate, and the wire pressing plate is located between the first connecting plate and the lower rear shell.

[0051] Preferably, in the above back clip, the lower rear shell is provided with a mounting groove for matching with the wire.

[0052] The wires are pressed against the lower rear shell through a wiring cover plate, and the wiring cover plate is connected to the lower rear shell.

[0053] A positioning column is provided on the guide block;

[0054] The wiring cover plate is provided with a positioning hole that cooperates with the positioning column.

[0055] As can be seen from the above technical solution, the back clip provided by the present invention can be mounted on a mobile terminal. The back clip includes a housing and an eye tracking device. The housing is used to connect to the mobile terminal. The eye tracking device is mounted on the housing and connected to the mobile terminal through the housing. This solution places the eye tracking device externally on the mobile terminal via the back clip. Without replacing the mobile terminal, the user can enable the mobile terminal to have eye tracking functionality, satisfying the user's need to experience eye tracking technology and reducing unnecessary waste of funds. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1 An exploded view of a back clip provided in an embodiment of the present invention;

[0058] Figure 2 An exploded view of a back clip provided in an embodiment of the present invention;

[0059] Figure 3 A schematic structural diagram of the front side of a back clip provided by an embodiment of the present invention;

[0060] Figure 4 A schematic structural diagram of the back side of a back clip provided by an embodiment of the present invention;

[0061] Figure 5 A schematic structural diagram of the back clip provided in an embodiment of the present invention after removing the first filter and the second filter;

[0062] Figure 6 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention with the upper front shell removed;

[0063] Figure 7 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention with the lower front shell removed;

[0064] Figure 8 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention with the wiring cover removed;

[0065] Figure 9 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention after removing the elastic member;

[0066] Figure 10 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention with the upper rear shell removed;

[0067] Figure 11 A schematic diagram of the structure of the back clip provided by an embodiment of the present invention with the lower rear cover removed;

[0068] Figure 12 A schematic diagram of the front structure of the lower rear housing provided by an embodiment of the present invention;

[0069] Figure 13 A schematic diagram of the back structure of the lower rear housing provided by an embodiment of the present invention;

[0070] Figure 14 A schematic diagram of the front structure of the upper rear housing provided by an embodiment of the present invention;

[0071] Figure 15 A schematic diagram of the back structure of the upper rear housing provided by an embodiment of the present invention;

[0072] Figure 16 A schematic diagram of the front structure of the lower front housing provided by an embodiment of the present invention;

[0073] Figure 17 A schematic diagram of the back structure of the lower front housing provided by an embodiment of the present invention;

[0074] Figure 18 A schematic diagram of the front structure of the upper front shell provided by an embodiment of the present invention;

[0075] Figure 19 A schematic diagram of the back structure of the upper front shell provided by an embodiment of the present invention;

[0076] Figure 20 A schematic structural diagram of a wiring cover provided in an embodiment of the present invention;

[0077] Figure 21 A schematic diagram of the front structure of a mobile phone and a back clip provided in an embodiment of the present invention;

[0078] Figure 22 A schematic diagram of the back structure of a mobile phone and a back clip provided by an embodiment of the present invention;

[0079] Figure 23 A schematic diagram of the back structure of the back clip after it is opened provided by an embodiment of the present invention;

[0080] Figure 24 This is a schematic diagram of the front structure of the back clip provided by an embodiment of the present invention after it is opened;

[0081] Figure 25 A schematic diagram of the structure of a bent back clip provided by an embodiment of the present invention;

[0082] Figure 26 This is a structural diagram of a mobile phone after being taken out of the back clip according to an embodiment of the present invention.

[0083] in,

[0084] 1. Shell, 11. Front shell, 111. Lower front shell, 1111. First slot, 1112. First front shell, 1113. First hole, 112. Upper front shell, 1121. Second slot, 1122. Second front shell, 1123. Second hole, 1124. Reinforcement rib, 12. Rear shell, 121. Lower rear shell, 1211. Guide block, 1212. Limiting groove, 1213. Hinge shaft, 1214. First connecting column, 1215. Positioning column, 1216. Heat dissipation hole, 122. Upper rear shell, 1221. Sidewall, 1 222. Gear lever, 1223. Limit column, 1224. Stop block, 1225. Hinge slot, 1226. Second connecting column, 1227. Elastic member, 1228. Wiring cover, 1229. Positioning hole, 2. Mobile terminal, 3. Image collector, 4. First infrared filter, 5. First infrared light emitter, 6. Fixing bracket, 7. Second infrared light emitter, 8. Second infrared filter, 9. Type-C interface, 10. Mounting bracket, 101. First connecting plate, 102. Second connecting plate, 103. Wire pressing plate. DETAILED DESCRIPTION

[0085] The present invention discloses a back clip, which enables a mobile terminal to meet the user's demand for experiencing eye tracking technology without replacing the mobile terminal.

[0086] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0087] The present invention discloses a back clip, which can be mounted on a mobile terminal 2 .

[0088] Preferably, the mobile terminal 2 in this solution is a mobile phone.

[0089] The back clip includes a housing 1 and an eye tracking device. The housing 1 is used to be connected to a mobile terminal 2. The eye tracking device is installed on the housing 1 and connected to the mobile terminal via a transmission interface.

[0090] The information transmission between the eye tracking device and the mobile terminal 2 can be a wired connection or a wireless connection (such as a Wi-Fi wireless local area network or a Bluetooth connection, an infrared connection, etc.).

[0091] In this solution, information transmission between the eye-tracking device and mobile terminal 2 is achieved through a transmission interface. Specifically, mobile terminal 2 supplies power to the eye-tracking device via the transmission interface. The eye-tracking device captures eye images and obtains the user's line of sight or gaze point. This information is then transmitted to mobile terminal 2 via the transmission interface. Mobile terminal 2 analyzes the received line of sight or gaze point and controls mobile terminal 2 to respond accordingly.

[0092] This solution places the eye tracking device on the mobile terminal 2 through a back clip, so that the mobile terminal 2 has the eye tracking function without replacing the mobile terminal 2, thereby meeting the user's needs to experience the eye tracking technology and reducing unnecessary waste of funds for the user.

[0093] An eye tracking device acquires eye images that reflect eye movements and estimates the user's line of sight and gaze point based on the acquired eye images.

[0094] Preferably, the eye tracking device is arranged on the side of the back clip facing the user's face, ensuring that the eye tracking device can effectively obtain the user's eye image.

[0095] Eye tracking technology is a commonly used technology. This solution uses an eye tracking device with eye tracking technology in a back clip. After the back clip is mounted on the mobile terminal, the eye tracking device is externally mounted on the mobile terminal 2, giving the mobile terminal 2 an eye tracking function.

[0096] In this solution, the signal from the eye tracking device acquired by the mobile terminal 2 is a signal that the mobile terminal 2 can recognize and is a signal for the mobile terminal 2 to make a corresponding functional response. Therefore, this solution does not require any improvement to the internal program of the mobile terminal 2.

[0097] Furthermore, the eye tracking device converts captured eye images into signals recognizable by the mobile terminal 2, which is also a prior art technology. This solution only applies this technology to the back clip and does not involve any program improvements. The back clip disclosed in this solution includes a front shell 11 and a back shell 12. The space between the front shell 11 and the back shell 12 is used to install the eye tracking device.

[0098] The front shell 11 can be mounted on the mobile terminal 2 , the rear shell 12 is connected to the front shell 11 , and a space for installing an eye tracking device is provided between the rear shell 12 and the front shell 11 .

[0099] In this solution, the eye tracking device is hidden and installed in the housing 1, which plays a protective role for the eye tracking device.

[0100] The installation position of the eye tracking device in the housing 1 is designed according to actual needs and is not specifically limited here, as long as it is ensured that it does not affect the collection of eye images by the eye tracking device.

[0101] In a specific embodiment of this solution, the front shell 11 of the housing 1 can be a housing 1 with a shape and material similar to that of a mobile phone housing. The housing 1 has a certain degree of flexibility, and the mobile terminal 2 is embedded in the housing 1 through deformation of the housing 1.

[0102] In another specific embodiment of the present solution, the rear shell 12 includes a lower rear shell 121 and an upper rear shell 122 , and the front shell 11 includes a lower front shell 111 and an upper front shell 112 .

[0103] like Figure 1 、 2 As shown in Figures 21, 22, 24 and 25, in the above embodiment, the front shell 11 and the rear shell 12 are designed as split structures, and the lower rear shell 121 of the rear shell 12 is movably connected to the upper rear shell 122 in the upper and lower directions. The lower front shell 111 and the lower rear shell 121 are positioned correspondingly and connected, and the upper front shell 112 and the upper rear shell 122 are positioned correspondingly and connected, so that the lower front shell 111 and the upper front shell 112 can move together with the movement of the lower rear shell 121 and the upper rear shell 122 respectively. It should be noted here that there is no connection between the lower front shell 111 and the upper front shell 112, and there is only a connection between the lower front shell 111 and the lower rear shell 121, and the upper front shell 112 and the upper rear shell 122.

[0104] It should be understood that there are multiple ways to implement the movable connection between the lower rear shell 121 and the upper rear shell 122. For example, one possible implementation is: the lower rear shell 121 and the upper rear shell 122 are connected by bolts, and when they need to be separated, the screws can be removed, and the screws can be installed to ensure that the lower rear shell 121 and the upper rear shell 122 are fixed; another possible implementation is: the lower rear shell 121 and the upper rear shell 122 are connected by magnets, and when they need to be separated, just hold the lower rear shell 121 and the upper rear shell 122 with your hands respectively, and apply a certain force to separate the lower rear shell 121 and the upper rear shell 122. When installing, align the positions of the magnets close to each other to ensure that the lower rear shell 121 and the upper rear shell 122 are fixed.

[0105] In the embodiment of this solution, the housing 1 may be a housing 1 with a certain hardness, that is, a housing 1 that cannot be deformed, and the mobile terminal 2 and the housing 1 are matched by sliding the lower rear housing 121 and the upper rear housing 122 .

[0106] Specifically, the upper rear shell 122 moves upward relative to the lower rear shell 121, causing the cavity of the housing 1 for mating with the mobile terminal 2 to expand, allowing the mobile terminal 2 to be inserted into the cavity. The upper rear shell 122 moves downward relative to the lower rear shell 121, causing the cavity of the housing 1 for mating with the mobile terminal 2 to shrink, allowing the mobile terminal 2 to become stuck in the cavity. When the mobile terminal 2 is to be removed, the upper rear shell 122 moves upward relative to the lower rear shell 121, causing the cavity of the housing 1 for mating with the mobile terminal 2 to expand, allowing the mobile terminal 2 to be removed. It should be noted that when the lower rear shell 121 and the upper rear shell 122 move relative to each other, one of the lower rear shell 121 and the upper rear shell 122 is secured by the user's hand. The above description uses the lower rear shell 121 as a reference, with the upper rear shell 122 being secured and moving up and down relative to the lower rear shell 121. Of course, the upper rear shell 122 can also be secured as a reference, with the lower rear shell 121 being secured and moving up and down relative to the upper rear shell 122.

[0107] It should be noted that the front and back of this solution are both referenced to the front and back of the mobile terminal 2. The side of the mobile terminal 2 provided with a screen is the front of the mobile terminal 2, and the side of the mobile terminal 2 opposite to the side provided with the screen is the back of the mobile terminal 2. The top and bottom of this solution are also referenced to the top and bottom of the mobile terminal 2. The bottom direction described in this solution is the bottom direction of the mobile terminal 2, and the top direction described in this solution is the top direction of the mobile terminal 2.

[0108] In a specific embodiment of this solution, the lower rear shell 121 and the upper rear shell 122 slide together through the cooperation of the guide block 1211 and the guide groove.

[0109] The guide groove can be a guide groove directly opened on the upper rear shell 122, or a guide groove formed by a structure. Specifically, a rib 1221 is provided at both ends of the upper rear shell 122, and a gear rod 1222 parallel to the rib 1221 is provided between the two ribs 1221. A guide groove is formed between the rib 1221 and the adjacent gear rod 1222 or between the adjacent gear rods 1222.

[0110] Whether the guide groove is directly opened on the upper rear shell 122 or the guide groove is formed by the structure, it is slidably matched with the guide block, that is, the guide block can slide under the guidance of the guide groove.

[0111] like Figure 1 、 2As shown in Figures 10, 12 and 13, a guide block 1211 is provided at the upper end of the lower rear shell 121. The guide block 1211 is located in the downward extension direction of the lower rear shell 121 and protrudes from the upper end surface of the lower rear shell 121. The front surface of the guide block 1211 is flush with the front surface of the lower rear shell 121. The thickness of the guide block 1211 is smaller than that of the lower rear shell 121. Accordingly, the connection position between the guide block 1211 and the rear surface of the upper rear shell 122 has a step surface.

[0112] Preferably, the guide block 1211 is integrally formed with the lower rear shell 121 , and the upper rear shell 122 is integrally formed with the retaining edge 1221 and the shift rod 1222 .

[0113] like Figure 4 、 13 As shown in FIG. 21 , the upper rear shell 122 slides along the rear surface of the guide block 1211 , and the lower end surface of the upper rear shell 122 can abut against the step surface.

[0114] Preferably, the number of guide grooves is equal to the number of guide blocks 1211 .

[0115] The thickness of the upper rear shell 122 is equal to the thickness of the step surface, ensuring that after the upper rear shell 122 and the lower rear shell 121 slide together, the rear surface of the upper rear shell 122 can be flush with the rear surface of the lower rear shell 121, thereby improving the overall aesthetics of the shell 1.

[0116] like Figure 1 、 6 As shown in , 7, 8, 9 and 14, there are two gear rods 1222, the length of the gear rod 1222 is equal to the length of the retaining edge 1221, the thickness of the gear rod 1222 is equal to the thickness of the retaining edge 1221, and the thickness of the guide block 1211 is equal to the thickness of the gear rod 1222.

[0117] The shift lever 1222 and the retaining edge 1221 are both located on a side of the upper rear shell 122 facing the upper front shell 112 , that is, on the front surface of the upper rear shell 122 .

[0118] In order to further improve the stability of the cooperation between the lower rear shell 121 and the upper rear shell 122 , in this solution, a limiting groove 1212 is provided on the lower rear shell 121 , and a limiting column 1223 is provided on the upper rear shell 122 .

[0119] Specifically, the limiting column 1223 corresponds to and is connected to the shift rod 1222 and the retaining edge 1221 , that is, a limiting column 1223 is provided on each shift rod 1222 and each retaining edge 1221 , and the thickness of the limiting column 1223 is equal to the thickness of the shift rod 1222 and the retaining edge 1221 .

[0120] like Figure 4 、 13As shown in Figures 21 and 22, a limiting groove 1212 is provided on the lower rear shell 121, and the limiting groove 1212 is opened at the end of the lower rear shell 121 and is located between adjacent guide blocks 1211. The bottom of the limiting groove 1212 (the side of the limiting groove 1212 opposite to the upper end face of the lower rear shell 121) is provided with a first guide inclined surface, and a limiting column 1223 is provided on the lower end face of the upper rear shell 122. The limiting column 1223 protrudes from the lower end face of the upper rear shell 122 and can cooperate with the limiting groove 1212. The limiting column 1223 is provided with a second guide inclined surface that cooperates with the first guide inclined surface.

[0121] When the lower rear shell 121 and the upper rear shell 122 slide relative to each other, that is, when the lower rear shell 121 and the upper rear shell 122 slide in the direction of clamping the mobile terminal 2, the limiting groove 1212 can cooperate with the limiting column 1223, and after the lower rear shell 121 and the upper rear shell 122 clamp the mobile terminal 2, the first guide slope of the limiting groove 1212 and the second guide slope of the limiting column 1223 are offset.

[0122] Preferably, the limiting groove 1212 is opened through the front and rear surfaces of the lower rear shell 121, and the thickness of the limiting column 1223 is equal to the thickness of the limiting groove 1212. After the first guide bevel and the second guide bevel are offset, the front surface of the limiting column 1223 is flush with the front surface of the lower rear shell 121, and the rear surface of the limiting column 1223 is flush with the rear surface of the lower rear shell 121.

[0123] The upper rear shell 122 is provided with a stopper 1224 that abuts against the end of the guide block 1211 facing away from the lower rear shell 121. Specifically, the guide block 1211 slides between the stopper 1224 and the lower end surface of the upper rear shell 122. The stopper 1224 limits the upward sliding position of the lower rear shell 121, preventing the second guide slope from sliding along the first guide slope. Transitional sliding means that the stopper post 1223 extends beyond the stopper slot 1212 and slides onto the front surface of the lower rear shell.

[0124] Preferably, the limiting column 1223 and the stop block 1224 are integrally formed with the upper rear shell 122 .

[0125] In a specific embodiment of this solution, the upper front shell 112 is bolted to the upper rear shell 122. Specifically, a first bolt hole can be provided on the upper rear shell 122, and a third through hole can be provided on the upper front shell 112. The first bolt passes through the third through hole and the first bolt hole in sequence to connect the upper front shell 112 and the upper rear shell 122.

[0126] In a specific embodiment of this solution, the lower front shell 111 is bolted to the lower rear shell 121. Specifically, the lower rear shell 121 is provided with a second bolt hole, and the lower front shell 111 is provided with a fourth through hole. The second bolt passes through the fourth through hole and the second bolt hole in sequence to connect the lower front shell 111 and the lower rear shell 121.

[0127] like Figure 3 、 5 , 16 and 18, the number of the third through holes is six, and the number of the fourth through holes is four.

[0128] In a more optimized specific embodiment of this solution, the lower rear shell 121 and the upper rear shell 122 can rotate relative to each other, so as to reduce the difficulty of taking out the mobile terminal and make it more convenient for the user to take out the mobile terminal.

[0129] Specifically, a hinge shaft 1213 is provided at the end of the guide block 1211 away from the lower rear shell 121, and a hinge groove 1225 cooperating with the hinge shaft 1213 is provided on the limiting column 1223. In order to meet the sliding requirements of the guide block 1211 in the guide groove, a sliding groove that can make way for the hinge shaft 1213 needs to be opened on the retaining edge 1221 or the shift rod 1222.

[0130] During use, the guide block 1211 slides in the guide groove, and the hinge shaft 1213 slides in the sliding groove. After the hinge shaft 1213 is inserted into the hinge groove 1225, the lower rear shell 121 and the lower front shell 111 are rotated backward to separate the mobile terminal 2 from the front surface of the lower front shell 111, and the mobile terminal 2 is removed. Of course, the upper rear shell 122 and the upper front shell 112 can also be rotated backward to separate the mobile terminal 2 from the front surface of the upper front shell 122, and the mobile terminal 2 can be removed.

[0131] In order to further improve the stability of the cooperation between the upper rear shell 122 and the lower rear shell 121, this solution provides a hollow positioning column on the upper rear shell 122, and a positioning hole corresponding to the position of the hollow positioning column is provided on the upper front shell 112, and the hollow positioning column can be inserted into the positioning hole.

[0132] like Figure 1 、 8 As shown in Figures 9, 10 and 12, the hollow positioning column is a long hollow positioning column, and the corresponding positioning socket is a long positioning socket.

[0133] Preferably, the hollow positioning column and the upper rear shell 122 are integrally formed.

[0134] In order to further improve the stability of the cooperation between the lower rear shell 121 and the upper rear shell 122, the rear shell 12 provided in this solution also includes a locking assembly.

[0135] Since the lower rear shell 121 and the upper rear shell 122 are connected by sliding and rotating, the connection structure is unstable. Therefore, the rear shell 12 also includes a locking assembly, which is used to lock the lower rear shell 121 and the upper rear shell 122 to prevent the rear shell 12 from scattering during use.

[0136] In a specific embodiment of this solution, the locking assembly includes a first connecting column 1214, a second connecting column 1226 and an elastic member 1227, which are used to lock the two ends of the rear shell 12 in the longitudinal direction. Figure 1 、 2 , 6, 7 and 8, the number of locking components is at least two groups, and they are evenly distributed along the width direction of the rear shell 12. It should be noted here that the width direction of the rear shell 12 is perpendicular to the up-down direction of the rear shell 12.

[0137] The first connecting post 1214 is disposed at the lower end of the front surface of the lower rear shell 121, the second connecting post 1226 is disposed at the upper end of the front surface of the upper rear shell 122, and the ends of the elastic member 1227 are respectively connected to the first connecting post 1214 and the second connecting post 1226. Specifically, the elastic member 1227 is connected to the first connecting post 1214 and the second connecting post 1226 in a sleeve connection, i.e., the ends of the elastic member 1227 are provided with connecting sleeves that cooperate with the first connecting post 1214 and the second connecting post 1226.

[0138] After the elastic member 1227 is engaged with the first connecting column 1214 and the second connecting column 1226 , the elastic member 1227 is in a stretched state, and can pull the lower rear shell 121 and the upper rear shell 122 toward the mating surfaces of the first guide slope and the second guide slope.

[0139] The stable cooperation between the housing and the mobile terminal also depends on the support of the housing by the mobile terminal.

[0140] like Figure 1-25 As shown, the lower rear shell 121 is a rectangular lower rear shell, the upper rear shell 122 is a rectangular upper rear shell, the first connecting column 1214 is located at two right angles at the lower end of the lower rear shell 121, and the second connecting column 1226 is located at two right angles at the upper end of the upper rear shell 122.

[0141] The elastic member 1227 may be an elastic rope or a spring.

[0142] In this optimized solution, the lower rear shell 121 and the upper rear shell 122 are connected by sliding and rotating. In order to facilitate the cooperation between the shell 1 and the mobile terminal 2, this solution sets a first slot 1111 on the front surface of the lower front shell 111 and a second slot 1121 on the front surface of the upper front shell 112.

[0143] When the shell 1 is matched with the mobile terminal 2, first slide the lower rear shell 121 downward relative to the upper rear shell 122, and the lower front shell 111 and the upper front shell 112 slide with the lower rear shell 121 and the upper rear shell 122 respectively, and the distance between the first slot 1111 and the second slot 1121 increases, and then insert the upper end of the mobile terminal 2 into the second slot 1121, and finally, slide the lower rear shell 121 upward relative to the upper rear shell 122, and the lower front shell 111 and the upper front shell 112 slide with the lower rear shell 121 and the upper rear shell 122 respectively, and the lower end of the mobile terminal 2 is inserted into the first slot 1111, completing the matching of the shell 1 and the mobile terminal 2.

[0144] When the housing 1 is separated from the mobile terminal 2, Figure 23 As shown, first, the lower rear shell 121 is slid downward relative to the upper rear shell 122, and the lower front shell 111 and the upper front shell 112 slide along with the lower rear shell 121 and the upper rear shell 122 respectively, and the distance between the first slot 1111 and the second slot 1121 increases until the first slot 1111 is separated from the lower end of the mobile terminal 2, as shown. Figure 24 Then the lower rear shell 121 is rotated backward in the direction away from the mobile terminal 2, at this time the mobile terminal 2 is not attached to the lower front shell 111, the lower end of the mobile terminal 2 is suspended, as shown Figure 25 As shown; Figure 26 Finally, remove the mobile terminal 2, rotate the lower rear cover 121 forward to return it to its initial position, and slide the upper rear cover 122 upward relative to the lower rear cover 121 until the first guide slope aligns with the second guide slope. The above embodiment is performed with the upper rear cover 122 fixed. The operation of inserting and removing the mobile terminal 2 can also be performed with the lower rear cover 121 fixed.

[0145] The above method can prevent the mobile terminal from being attached to the lower front shell 111 or the upper front shell 112, making it more convenient to take out the mobile phone.

[0146] Generally, smart phones have buttons on the side for adjusting volume or turning on and off. In order to facilitate the operation of the phone, Figure 5 As shown, in this solution, a first hole 1113 that cooperates with a button or jack of the mobile terminal 2 is provided on the first side wall 11111 of the first slot 1111, wherein the first side wall 11111 is a side wall perpendicular to the front surface of the upper front shell 111;

[0147] like Figure 5 As shown, in this solution, a second hole 1123 that cooperates with the jack or button of the mobile terminal 2 is opened on the second side wall 11211 of the second slot 1121, wherein the second side wall 11211 is a side wall perpendicular to the front surface of the upper front shell 112.

[0148] like Figure 1 、 2As shown in Figures 3, 5, 16, 17, 20, 21, 22, 23, 24 and 25, the first slot 1111 includes a first side wall 11111 perpendicular to the front surface of the lower front shell 111, a third side wall 11112 parallel to the front surface of the lower front shell 111 and a fourth side wall 11113 capable of abutting against the lower end surface of the mobile terminal 2.

[0149] like Figure 1 、 2 As shown in Figures 3, 5, 18, 19, 20, 21, 22, 23, 24 and 25, the second slot 1121 includes a second side wall 11211 perpendicular to the front surface of the upper front shell 112, a fifth side wall 11212 parallel to the front surface of the lower front shell 111 and a sixth side wall 11213 capable of abutting against the upper end surface of the mobile terminal 2.

[0150] In this embodiment, the first side wall 11111 and the second side wall 11112 are both side walls that fit the side edges of the mobile terminal 2 rather than side walls that abut against the lower end face and the upper end face of the mobile terminal 2 .

[0151] like Figure 1 、 3 As shown in Figures 5 and 6, the manufacturer's logo can be engraved under the third side wall 11113.

[0152] In this solution, the position of the housing 1 for installing the eye tracking device is the first front shell 1112 .

[0153] like Figure 1 、 3 As shown in Figures 5, 6, 16, 17, 20, 21, 22, 23, 24, and 25, the first front housing 1112 is disposed on the front surface of the lower front housing 111 and is located below the first slot 1111. The front and rear surfaces of the first front housing 1112 are both open. The eye tracking device captures the user's eye image through the front surface of the first front housing 1112 and is installed in the first front housing 1112 through the rear surface of the first front housing 1112.

[0154] An open end of the rear surface of the first front housing 1112 is closed by the lower rear case 121 .

[0155] like Figure 5 and 6 As shown, the thickness of the side wall of the first front shell 1112 perpendicular to the front surface of the lower front shell 111 is greater than the thickness of the eye tracking device to ensure that there is no gap after the lower rear shell 121 and the lower front shell 111 are matched, thereby achieving a sealed installation of the eye tracking device.

[0156] like Figure 13As shown, since the eye tracking device generates heat during use, a heat dissipation hole 1216 is provided on the lower rear shell 121 of the present solution at a position corresponding to the eye tracking device.

[0157] Since the first front shell 1112 has a certain thickness, and the thickness is greater than the thickness of the part of the lower front shell 111 that does not correspond to the position of the first front shell 1112, at this time, the lower rear shell 121 needs to be bent to achieve effective connection with the rear surface of the first front shell 1112.

[0158] like Figure 20 and 21 As shown, the thickness of the housing at the location for mounting the eye tracking device is greater than the thickness of the middle portion and the thickness of the upper portion of the housing.

[0159] In a specific embodiment of the present solution, the eye tracking device includes an image collector 3 , a first infrared filter 4 , a first infrared light emitter 5 and a fixing bracket 6 .

[0160] The image collector 3 is used to capture eye images of the user's eye movements and extract eye features from the captured eye images for use in establishing a line of sight / gaze point estimation model. Specifically, the eye features may include pupil position, pupil shape, iris position, iris shape, eyelid position, eye corner position, and light spot position.

[0161] The image collector 3 can be a camera or a video camera.

[0162] The first infrared light emitter 5 is used to emit infrared light, which is reflected by the user's cornea to form a corneal reflection spot, namely, a Purkinje spot.

[0163] The first infrared filter 4 blocks visible light from entering the image collector 3 while allowing infrared light to enter. This makes it easier to capture eye features in captured eye images. Because the infrared filter blocks visible light, the internal structure of the product is hidden from view, further enhancing its aesthetics. The first infrared filter 4 is positioned on the front surface of the first front housing 1112.

[0164] The fixing bracket 6 provides a mounting base for the image collector 3 and the first infrared light emitter 5 . The image collector 3 is mounted on the rear surface of the fixing bracket 6 , and the first infrared light emitter 5 is mounted on the front surface of the fixing bracket 6 .

[0165] The fixing bracket 6 is connected to the lower rear shell 121. Figure 1 、 2As shown in FIG11 , a first mounting plate perpendicular to the front surface of the lower rear housing 121 is provided at the location where the lower rear housing 121 is connected to the fixing bracket 6. A second mounting plate perpendicular to the fixing bracket 6 is provided on the fixing bracket 6. The first mounting plate and the second mounting plate are bolted together. Specifically, the second mounting plates are provided on both sides of the fixing bracket 6 in the longitudinal direction and are located on the upper surface of the fixing bracket 6.

[0166] like Figure 1 、 2 As shown in Figures 11 and 11, the fixing bracket 6 is connected to the first infrared light emitter 5 and the image collector 3 by bolts. Since the first infrared light emitter 5 and the image collector 3 are of comparable size, in order to achieve the connection between the fixing bracket 6 and the first infrared light emitter 5 and the image collector 3, this solution provides step surfaces at both ends of the length direction of the fixing bracket 6, wherein the horizontal surface of the first step surface is provided with a fifth bolt hole connected to the first infrared light emitter 5, and the horizontal surface of the second step surface is provided with a sixth bolt hole connected to the image collector 3. The second mounting plate is connected to the vertical surface of the second step surface. Here, the surface parallel to the plane where the step surface and the fixing bracket 6 are located is named the horizontal surface, and the surface perpendicular to the plane where the step surface and the fixing bracket 6 are located is named the vertical surface.

[0167] like Figure 1 、 2 As shown in FIG11 , the fixing bracket 6 is a U-shaped fixing bracket. The fixing bracket 6 has a symmetrical structure and is provided with a U-shaped notch for the image collector 3 to pass through.

[0168] The first infrared light emitter 5 is also provided with a first through hole for the image collector 3 to pass through, and the first through hole corresponds to the position of the U-shaped notch.

[0169] like Figure 1 、 2 As shown in FIG11 , the first through hole is a circular through hole, and the U-shaped notch is a rectangular notch.

[0170] A power supply for supplying power to the first infrared light emitter 5 is provided on the upper surface of the fixing bracket 6 , and the power supply is connected to the transmission interface.

[0171] During use, the mobile terminal 2 can supply power to the power supply through the transmission interface, and then the power supply supplies power to the first infrared light emitter 5 .

[0172] It should be noted here that the mobile terminal 2 can only power the eye tracking device, and the eye tracking device cannot power the mobile terminal 2.

[0173] In this solution, a charging port is provided on the first front housing 1112, which is connected to a power source and can be connected to an auxiliary power supply device to supply power to the power source. The auxiliary power supply device can be a power bank or a mains power source.

[0174] In order to further optimize the above technical solution, the eye tracking device further includes a second infrared light emitter 7 and a second infrared filter 8. The second infrared light emitter is connected to the power supply of the eye tracking device via a wire.

[0175] The second infrared light emitter 7 and the second infrared filter 8 are disposed at the upper end of the housing 1 , and the second infrared filter 8 is disposed on the front surface of the upper front shell 112 .

[0176] like Figure 1 、 2 As shown in Figures 3, 5, 18, 19, 20, 21, 22, 23, 24 and 25, a second front shell 1122 is provided at the upper end of the upper front shell 112, and the front surface and rear surface of the second front shell 1122 are both open ends, wherein the front surface of the second front shell 1122 is blocked by the second infrared filter 8, and the rear surface of the second front shell 1122 is blocked by the upper rear shell 122.

[0177] like Figure 1 、 2 As shown in Figures 3, 5, 18, 19, 20, 21, 22, 23, 24 and 25, the portion of the upper rear shell 122 corresponding to the position of the second front shell 1122 has a certain tilt angle relative to the portion of the upper rear shell 122 not corresponding to the position of the second front shell 1122.

[0178] The second infrared light emitter 7 is bolted to the upper rear housing 122 .

[0179] Preferably, in this solution, the first infrared filter 4 is adhesively connected to the first front housing 1112 , and the second infrared filter 8 is adhesively connected to the second front housing 1122 .

[0180] like Figure 20 and 21 As shown, the thickness of the shell at the position for installing the eye tracking device is greater than the middle thickness and the upper end thickness of the shell, and the thickness of the shell at the position for installing the second infrared light emitter 7 and the second infrared filter 8, that is, the upper end thickness of the shell is greater than the middle thickness of the shell.

[0181] In this solution, the lower end of the shell is used to install the image collector 3, the first infrared filter 4, the first infrared light emitter 5 and the fixing bracket of the eye tracking device, the upper end of the shell is used to install the second infrared light emitter 7 and the second infrared filter 8 of the eye tracking device, and the middle part of the shell is used to press the wires.

[0182] In order to further improve the connection strength between the lower rear shell 121 and the lower front shell 111, a first connecting column is provided at a right angle position of the lower rear shell 121, a sixth bolt hole is provided on the first connecting column, a first hollow column corresponding to the position of the first connecting column is provided on the lower front shell 111, a fifth through hole is provided in the first hollow column, a bolt passes through the fifth through hole and cooperates with the sixth bolt hole to realize the connection between the lower rear shell 121 and the lower front shell 111; a second connecting column is provided at a right angle position of the upper rear shell 122, a seventh bolt hole is provided on the second connecting column, a second hollow column corresponding to the position of the second connecting column is provided on the upper front shell, a second through hole is provided in the second hollow column, a bolt passes through the second through hole and cooperates with the seventh bolt hole to realize the connection between the lower front shell 111 and the upper front shell 112.

[0183] In a specific embodiment of this solution, the transmission interface is a Type-C interface 9, which is connected to the rear shell 12 via a mounting bracket 10. The Type-C interface 9 is used to connect to the transmission interface of the mobile terminal 2.

[0184] The transmission interface of the mobile terminal 2 is located at the lower end, and the type-c interface 9 is connected to the lower rear shell 121.

[0185] like Figure 1 、 2 As shown in FIG11 , the mounting bracket 10 includes a first connecting plate 101 and a second connecting plate 102 .

[0186] Among them, the first connecting plate 101 is perpendicular to the second connecting plate 102, the first connecting plate 101 is connected to the rear shell 12, the first connecting plate 101 can be connected to the lower rear shell 121 or the upper rear shell 122. Whether the first connecting plate 101 is specifically connected to the lower rear shell 121 or the upper rear shell 122 is designed according to the position of the transmission interface of the mobile terminal 2.

[0187] In a specific embodiment of this solution, Figure 1 、 2 As shown in FIG. 11 , the mounting bracket 10 is connected to the lower rear housing 121 .

[0188] The Type-C interface 9 is bolted to the second connecting plate 102 .

[0189] Since the second infrared light emitter 7 is far away from the first infrared light emitter 5 , the first infrared light emitter 5 and the second infrared light emitter 7 in this solution are connected via a wire.

[0190] like Figure 1 、 9 As shown in FIG10 , a mounting groove for matching with the wire is provided on the rear shell 12 , and correspondingly, a mounting groove corresponding to the position of the mounting groove is also provided on the guide block 1211 .

[0191] In order to improve the compactness of the back clip structure, in this solution, the wires are pressed against the rear shell 12 through the wiring cover 1228 , and the wiring cover 1228 is connected to the lower rear shell 121 .

[0192] like Figure 20 As shown, there are multiple wiring covers 1228 , which are arranged in parallel on the lower rear shell 121 . The wiring covers are used to compress the wires between two adjacent guide blocks 1211 and the wires in the mounting grooves.

[0193] The thickness of the lower end of the wiring cover plate 1228 is greater than the thickness of the upper end of the wiring cover plate 1228. The front surface of the wiring cover plate 1228 forms a step surface due to the thickness difference between the upper and lower ends of the wiring cover plate. The step surface is an inclined transition step surface. Specifically, Figure 1 、 8 As shown in Figures 9, 10 and 12, a positioning column 1215 is provided on the guide block 1211, and a positioning hole 1229 corresponding to the position of the positioning column 1215 is opened on the wiring cover 1228. The guide block 1211 and the wiring cover 1228 are connected through the positioning column 1215 and the positioning hole 1229.

[0194] In order to further optimize the above technical solution, the thinner portion of the wiring cover 1228 is also provided with a jack, and correspondingly, the guide block 1211 is provided with a plug rod that cooperates with the jack. Figure 20 As shown, each wiring cover plate 1228 is provided with three groups of jacks, which are opened in sequence along the length direction of the wiring cover plate 1228. Each group of jacks includes two jacks, and the two jacks in each group are arranged along the width direction of the wiring cover.

[0195] Preferably, the positioning column 1215 and the guide block 1211 are integrally formed.

[0196] Due to the presence of the mounting groove, the elastic member 1227 and the stop rod 1222, the guide block 1211 is divided into multiple blocks, such as Figure 1 、 8 As shown in Figures 9, 10 and 12, the number of guide blocks 1211 is 8. Two adjacent guide blocks 1211 are connected to a wiring cover plate 1228. The wiring cover plate 1228 not only achieves compression of the wires, but also achieves compression of the elastic member 1227.

[0197] In order to further optimize the above technical solution, the mounting frame 10 disclosed in this solution further includes a wire pressing plate 103. The wire pressing plate 103 is connected to the first connecting plate 101 and is located between the first connecting plate 101 and the lower rear shell 121 for pressing the wires against the lower rear shell 121.

[0198] like Figure 1 、 2As shown in FIG11 , the wire pressing plate 103 is a U-shaped wire pressing plate, and two side plates of the U-shaped wire pressing plate 103 are located on both sides of the interior of the lower rear shell 121 .

[0199] The edge of the upper front shell 112 is provided with a reinforcing rib 1124, and the reinforcing rib 1124 is integrally formed with the upper front shell 112. Figure 1 、 3 As shown in , 5 and 18, the reinforcing rib 1124 is a U-shaped reinforcing rib, the bottom plate of the U-shaped reinforcing rib is located at the lower end of the upper front shell 112, and the side plates of the U-shaped reinforcing rib are located on both sides of the upper front shell 112. An eighth bolt hole corresponding to the position of the stop block 1224 is provided on the side wall of the U-shaped reinforcing rib, and a ninth bolt hole is provided on the stop block 1224, and the bolts pass through the eighth bolt hole in sequence to cooperate with the ninth bolt hole.

[0200] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A back clip, suitable for a mobile terminal (2), characterized in that: include: A housing (1) capable of being mounted on a mobile terminal (2); An eye tracking device, mounted on the housing (1) and capable of being connected to the mobile terminal (2) via a transmission interface; The housing (1) comprises: a front housing (11) capable of being mounted on the mobile terminal (2); A rear shell (12) is connected to the front shell (11), and the eye tracking device is installed between the rear shell (12) and the front shell (11); The rear shell (12) comprises a lower rear shell (121), an upper rear shell (122) and a locking assembly, wherein the lower rear shell (121) and the upper rear shell (122) are movably connected up and down, and the locking assembly is used to achieve a fixed connection between the lower rear shell (121) and the upper rear shell (122); The front shell (11) comprises a lower front shell (111) and an upper front shell (112), wherein the lower front shell (111) is connected to the lower rear shell (121), and the upper front shell (112) is connected to the upper rear shell (122); the lower front shell (111) and the upper front shell (112) can move together with the movement of the lower rear shell 121 and the upper rear shell 122 respectively, and there is no connection relationship between the lower front shell (111) and the upper front shell (112), and there is only a connection relationship between the lower front shell (111) and the lower rear shell (121), and the upper front shell (112) and the upper rear shell (122).

2. The back clip according to claim 1, characterized in that: A guide block (1211) is provided at the upper end of the lower rear shell (121), the front surface of the guide block (1211) is flush with the front surface of the lower rear shell (121), and the thickness of the guide block (1211) is smaller than that of the lower rear shell (121); Both ends of the upper rear shell (122) are provided with ribs (1221), and a shift rod (1222) parallel to the ribs (1221) is provided between the two ribs (1221). A guide groove is formed between the ribs (1221) and the adjacent shift rods (1222) or between adjacent shift rods (1222). The guide groove is in sliding engagement with the guide block (1211), and the rear surface of the upper rear shell (122) is flush with the rear surface of the lower rear shell (121).

3. The back clip according to claim 2, characterized in that: A limiting groove (1212) is provided on the lower rear shell (121), located between adjacent guide blocks (1211), and a first guiding inclined surface is provided at the bottom of the limiting groove (1212); A limiting column (1223) is provided on the lower end surface of the upper rear shell (122), corresponding to the position of the retaining edge (1221) or the shift lever (1222); the limiting column (1223) cooperates with the limiting groove (1212); and a second guiding inclined surface is provided on the limiting column (1223) to cooperate with the first guiding inclined surface; A stopper (1224) is provided on the front surface of the upper rear shell (122), capable of abutting against an end of the guide block (1211) away from the lower rear shell (121).

4. The back clip according to claim 3, characterized in that: A first bolt hole is provided on the upper rear shell, and the upper front shell (112) is connected to the upper rear shell (122) via a first bolt that cooperates with the first bolt hole; A second bolt hole is provided on the lower rear shell (121), and the lower front shell (111) is connected to the lower rear shell (121) via a second bolt that matches the second bolt hole.

5. The back clip according to claim 3, characterized in that: An end of the guide block (1211) away from the lower rear shell (121) is provided with a hinge shaft (1213); A sliding groove cooperating with the hinge shaft (1213) is provided on the retaining edge (1221) or the shift rod (1222), and a hinge groove (1225) cooperating with the hinge shaft (1213) is provided on the limiting column (1223).

6. The back clip according to claim 2, characterized in that: The locking assembly comprises: a first connecting column (1214), arranged at the lower end of the front surface of the lower rear shell (121); A second connecting column (1226) is provided at the upper end of the front surface of the upper rear shell (122); An elastic member (1227), one end of the elastic member (1227) is connected to the first connecting column (1214), and the other end of the elastic member (1227) is connected to the second connecting column (1226).

7. The back clip according to claim 2, characterized in that: The front surface of the lower front shell (111) is provided with a first slot (1111) capable of inserting the lower end of the mobile terminal (2); a first hole (1113) cooperating with a button of the mobile terminal (2) is provided on a first side wall of the first slot (1111) perpendicular to the front surface of the lower front shell (111); The front surface of the upper front shell (112) is provided with a second slot (1121) capable of inserting the upper end of the mobile terminal (2), and a second hole (1123) that cooperates with the socket of the mobile terminal (2) is provided on a second side wall of the second slot (1121) that is perpendicular to the front surface of the upper front shell (112).

8. The back clip according to claim 7, characterized in that: The front surface of the lower front shell (111) is provided with a first front shell (1112) for mounting the eye tracking device, and is located below the first slot (1111), and the front surface and rear surface of the first front shell (1112) are both open ends; The lower end of the lower rear shell (121) is capable of blocking the rear surface of the first front shell (1112).

9. The back clip according to claim 8, characterized in that: The eye tracking device comprises: An image collector (3) connected to the transmission interface; A first infrared filter (4) mounted on the front surface of the first front housing (1112); A first infrared light emitter (5), wherein the first infrared light emitter (5) is provided with a first through hole for the image collector (3) to pass through; A fixed bracket (6) is connected to the lower rear shell (121), The rear surface of the fixing bracket (6) is connected to the image collector (3), and a notch corresponding to the position of the first through hole is provided on the fixing bracket (6). The front surface of the fixing bracket (6) is connected to the first infrared light emitter (5), and a power supply for supplying power to the first infrared light emitter (5) is provided on the fixing bracket (6), and the power supply is connected to the transmission interface.

10. The back clip according to claim 9, characterized in that: The eye tracking device further comprises: A second infrared light emitter (7) is arranged at the upper end of the housing (1) and is connected to the power supply via a wire; A second infrared filter (8) is arranged at the upper end of the housing (1) and located on the front surface of the upper front housing (112).

11. The back clip according to claim 10, characterized in that: A second front shell (1122) is provided at the upper end of the upper front shell (112), and the front surface and the rear surface of the second front shell (1122) are both open ends. The front surface of the second front shell (1122) is blocked by a second infrared filter (8), and the rear surface of the second front shell (1122) is blocked by an upper rear shell (122).

12. The back clip according to claim 11, characterized in that: The transmission interface is a Type-C interface (9), and the Type-C interface (9) is connected to the rear shell (12) via a mounting bracket (10). The mounting bracket (10) comprises: A first connecting plate (101) connected to the lower rear shell (121); The second connecting plate (102) is perpendicular to the first connecting plate (101) and is connected to the type-c interface (9).

13. The back clip according to claim 12, characterized in that: The mounting bracket (10) further comprises a wire pressing plate (103), the wire pressing plate (103) being connected to the first connecting plate (101), and the wire pressing plate (103) being located between the first connecting plate (101) and the lower rear shell (121).

14. The back clip according to claim 13, characterized in that: The lower rear shell (121) is provided with a mounting groove that matches the wire. The wires are pressed against the lower rear shell (121) via a wiring cover plate (1228), and the wiring cover plate (1228) is connected to the lower rear shell (121). A positioning column (1215) is provided on the guide block (1211); The wiring cover plate (1228) is provided with a positioning hole (1229) that cooperates with the positioning column (1215).

Images