Portable eyestrain detection device with infrared camera

Abstract

The portable eyestrain detection device comprises a head-mounted device body, a suspension connecting frame and a double-infrared-camera-shooting assembly, the suspension connecting frame is obliquely arranged below the head-mounted device body, the bottom of the suspension connecting frame extends to the position below the eyes of a testee, and the double-infrared-camera-shooting assembly is arranged on the suspension connecting frame. The double-infrared camera shooting assembly is arranged at the bottom end of the hanging connecting frame, and two infrared cameras of the double-infrared camera shooting assembly shoot the eyes of the testee from bottom to top in an inclined mode. Through the structural cooperation of the head-mounted device main body, the suspension connecting frame and the double infrared camera assemblies, the device is in a wearable form, a user can carry out eyestrain detection anytime and anywhere, a specific environment or professional setting is not needed, a complex infrared shooting alignment debugging process is not needed, and the operation process is simplified; due to the fact that the double infrared cameras are fixed to the stable position lower than the eyes and shoot the eyes from bottom to top, the front view of a testee cannot be blocked, and daily activities can be continued in the using process of the device.

Description

Technical Field

[0001] This utility model relates to the field of eye fatigue detection technology, specifically to a portable eye fatigue detection device with an infrared camera. Background Technology

[0002] Eye strain, also known as visual fatigue or screen time syndrome, is a common symptom of discomfort after prolonged use of electronic screens (such as computers, tablets, and smartphones). Taking an eye strain test can help people understand their eye health and take appropriate measures to relieve fatigue.

[0003] By acquiring infrared image data of the eye and extracting pupil parameters, various parameters about the pupil can be obtained, such as pupil diameter, pupillary variability, and pupillary adaptation speed. Changes in pupil diameter may be related to the degree of visual fatigue; a larger pupil diameter may indicate a higher level of visual fatigue. Increased pupillary variability may be related to the degree of eye fatigue, while a slower pupillary adaptation speed may be related to visual fatigue caused by prolonged use of electronic devices.

[0004] For example, Chinese Invention Patent Publication No. CN117173776A proposes a pupil fatigue detection method based on infrared camera data. This method acquires infrared image data of the subject's eyes; processes the infrared image data using an image processing algorithm to obtain pupil position data and edge data; based on the pupil position data and edge data, it obtains a dataset of pupil diameter position changes and a dataset of pupil center position changes within a time period T; and compares these datasets with a visual analog scale (VAS) to obtain pupil fatigue detection results. This method solves the problems of strong subjectivity, significant limitations, and low accuracy in traditional pupil detection methods.

[0005] However, the aforementioned infrared eye camera is a standalone device placed in a fixed position, such as on a table. Furthermore, since there is a certain distance between the infrared eye camera and the subject's eyes, professional adjustments are required to ensure that the infrared camera accurately captures eye image data. This not only limits the portability of the device but also increases the complexity and inconvenience of its use.

[0006] The above problems are worth solving. Utility Model Content

[0007] To overcome the inconvenience of using existing pupil fatigue detection devices based on infrared cameras, this invention provides a portable eye fatigue detection device with an infrared camera.

[0008] The technical solution of this utility model is as follows:

[0009] A portable eye fatigue detection device with an infrared camera, characterized in that it comprises:

[0010] The main body of the head-mounted device is detachable and can be worn on the forehead of the test subject;

[0011] A suspension connection frame is inclinedly disposed below the middle of the housing of the head-mounted device body, and the bottom of the suspension connection frame extends below the eyes of the test subject;

[0012] A dual infrared camera assembly is disposed at the bottom end of the suspension connecting frame, and the two infrared cameras of the dual infrared camera assembly are tilted from bottom to top to capture the eyes of the subject.

[0013] The head-mounted device has a built-in processing chip, which is used to receive, process, and analyze eye images captured by the infrared camera.

[0014] As a preferred embodiment of this utility model, the mainboard inside the head-mounted device integrates a WiFi module, a 4G / 5G module, and a Bluetooth module. The WiFi module is used to upload detection data to a cloud service via a WiFi network, the 4G / 5G module is used to provide a cellular network connection for data transmission, and the Bluetooth module is used to wirelessly connect with smart mobile devices that have Bluetooth signals.

[0015] As a preferred embodiment of this utility model, the main body of the head-mounted device includes a core functional part located in the middle and support legs located on both sides. The ends of the support legs are provided with loops, and the loops of the two support legs are respectively connected to the two ends of the elastic band.

[0016] Furthermore, the core functional unit is provided with a TF card slot for inserting a TF card.

[0017] Furthermore, the core functional unit is equipped with a TOF sensor, and the detection direction of the TOF sensor is facing directly in front of the main body of the head-mounted device.

[0018] Furthermore, one of the support legs on one side of the main body of the head-mounted device is provided with a TYPE-C interface or a USB interface. A power supply box or a control box is connected through the TYPE-C interface, and a computer is connected through the USB interface.

[0019] As a preferred embodiment of this utility model, the control box is provided with several buttons and / or a touch screen. The control box is used to issue power-on control commands, power-off control commands, start detection commands, pause / continue detection commands, parameter setting commands, and mode selection commands to the main body of the head-mounted device.

[0020] As a preferred embodiment of this utility model, the device housing includes a front shell and a back plate. The inner wall of the front shell is provided with a fastening protrusion near the edge, and the back plate is provided with a fastening hole along its edge. The fastening protrusion and the fastening hole are detachably connected. The inner wall of the front shell is provided with several sets of screw seats, and the back plate is provided with several screw holes corresponding to the screw seats. Screws are inserted into the screw seats through the screw holes for fastening.

[0021] Furthermore, the front shell includes an integrally formed functional part shell and support leg shells located on both sides, and a connecting frame front shell is integrally formed in the lower middle of the functional part shell; the back plate includes a left support leg back plate, a middle back plate, a right support leg back plate and a connecting frame back plate, the left support leg back plate and the right support leg back plate respectively correspond to the two support leg shells, the middle back plate corresponds to the functional part shell, and the connecting frame back plate corresponds to the connecting frame front shell.

[0022] Furthermore, the functional unit housing consists of a top plate, a front plate, and a bottom plate, forming a C-shaped receiving cavity with an opening on one side. The top plate, the front plate, and the bottom plate are all provided with several heat dissipation holes. The top plate is also provided with a card slot, which serves as the slot for a TF card slot. The front plate is also provided with a sensor sensing cutout in the middle, which serves as the sensing window for a TOF sensor. The bottom plate is also provided with a notch located in the middle of the bottom plate and connected to the front housing of the connecting frame. The connecting wire of the dual infrared camera assembly enters the cavity inside the suspension connecting frame, passes through the notch, is introduced into the C-shaped receiving cavity, and connects to the working main board.

[0023] Furthermore, on one side of the support leg connected to the power supply box or control box, a flexible circuit board is provided on the inner side of the top wall of the support leg housing. The flexible circuit board connects the main board and the interface board, and the interface board is a TYPE-C interface board or a USB interface board. The functional part housing has a buried wire channel on the side near the support leg connected to the power supply box or control box. The connection line between the flexible circuit board and the main board is set in the buried wire channel. The buried wire channel is also used to enhance the structural strength of the front shell.

[0024] Furthermore, the junction between the functional housing and the leg housing has an arc-shaped transition section.

[0025] Furthermore, the back panel is preferably made of thermoplastic polyurethane, and the surface of the back panel is provided with several rubber pads or silicone pads.

[0026] As a preferred embodiment of this utility model, the dual infrared camera assembly includes a hollow support rod and a connecting rod. The connecting rod is connected to the bottom end of the suspension connecting frame, and the support rod is vertically connected to the connecting rod and horizontally arranged. The support rod has a symmetrical structure, with a camera mounting base at each end. Each camera mounting base is equipped with an infrared camera, and the two infrared cameras respectively capture images of the left and right eyes of the subject.

[0027] Furthermore, the center distance between the two camera mounts is 54 mm to 74 mm.

[0028] As a preferred embodiment of this utility model, each of the camera mounting bases is provided with an infrared fill light on its side, and the infrared fill light is located between the connecting rod and the camera mounting base on the same side.

[0029] As a preferred embodiment of this utility model, the connecting rod is hinged to the bottom end of the suspension connecting frame, and a fastening bolt is provided at the hinge. The dual infrared camera assembly achieves fine adjustment of the shooting angle through the hinge structure between its connecting rod and the suspension connecting frame.

[0030] Furthermore, the adjustment angle of the dual infrared camera assembly on the suspension connector is 90°.

[0031] As a preferred embodiment of this utility model, the connecting rod part is a hollow structure with a shaft groove at its end, the shaft groove communicating with the inner cavity of the connecting rod part; the bottom of the suspension connecting frame is provided with a rotating shaft, the rotating shaft rotates in the shaft groove, and the fastening bolt passes through the side wall of the shaft groove and the through hole of the rotating shaft.

[0032] Furthermore, the side of the rotating shaft is provided with a rotating opening, the rotating opening having a first abutting surface and a second abutting surface, the first abutting surface and the second abutting surface being parallel to the axis of the rotating shaft; the first groove edge and the second groove edge of the shaft groove, which are parallel to the axial direction, correspond to the first abutting surface and the second abutting surface, respectively. When the rotating shaft rotates relative to the shaft groove until the first groove edge contacts the first abutting surface, the connecting rod portion rotates around the bottom end of the suspension connecting frame to a first limit position; when the rotating shaft rotates relative to the shaft groove until the second groove edge contacts the second abutting surface, the connecting rod portion rotates around the bottom end of the suspension connecting frame to a second limit position.

[0033] Furthermore, the outer sides of the two side walls of the shaft groove are respectively provided with a circular groove and a polygonal groove. The fastening bolt is inserted into the shaft groove from one side of the circular groove, passes through the through hole of the rotating shaft, and exits the shaft groove from one side of the polygonal groove, and is connected to the polygonal nut.

[0034] Furthermore, there is a gap between the first contact surface of the rotating port and the front housing of the connecting frame of the suspension connecting frame, and the connecting wire of the dual infrared camera assembly passes through the gap into the cavity of the suspension connecting frame.

[0035] Furthermore, the first groove edge of the shaft groove is a rounded edge.

[0036] As a preferred embodiment of this utility model, the vertical distance from the top back of the suspension connecting frame to the back plate of the head-mounted device body is 5 to 10 mm, and the tilt angle of the back of the suspension connecting frame is 10° to 15°.

[0037] As a preferred embodiment of this utility model, the back of the suspension connecting frame is provided with an elastic nose pad. The elastic nose pad includes an integrally formed connecting and fixing part and a nose bridge supporting part. The connecting and fixing part is detachably connected to the suspension connecting frame, and the nose bridge supporting part is used to support the nose bridge of the test subject.

[0038] Furthermore, the end of the nose bridge support extends below the nose pads of the test subject's glasses.

[0039] Furthermore, the two supporting nose bridge portions are turned outwards, and the outer surfaces of the two supporting nose bridge portions respectively abut against the two eyeglass frames.

[0040] As a preferred embodiment of this utility model, the housing of the suspension connecting frame includes a front housing and a back plate. The back plate is provided with a nose pad mounting groove, and the nose pad mounting groove is provided with a plurality of screw holes. The connecting fixing part is provided with a strip hole, and the strip hole is provided with a round hole at the position corresponding to the screw hole. The plurality of round holes are arranged along the length direction of the strip hole, and the width of the round hole is greater than the width of the strip hole.

[0041] The advantages of this utility model based on the above solution are as follows:

[0042] This utility model discloses a portable eye fatigue detection device with infrared cameras. Through the structural cooperation of a head-mounted device body, a suspension connecting frame, and dual infrared camera components, the device is wearable, allowing users to perform eye fatigue detection anytime and anywhere without relying on a specific environment or professional settings. After the device is worn, the suspension connecting frame places the two camera lenses of the dual infrared camera components in front of the subject's eyes at a very close distance, eliminating the need for complicated alignment and adjustment processes to align the lenses with the eyes and begin detection, greatly simplifying the operation process. Since the dual infrared cameras are fixed in a stable position below the eyes and shoot the eyes from below, they do not obstruct the subject's forward field of vision, allowing users to continue their daily activities while using this device.

[0043] Furthermore, the suspension connector has a spacious inner cavity to accommodate all the wiring of the dual infrared camera assembly. The dual infrared camera assembly can be equipped with two infrared cameras and an auxiliary fill light to improve shooting accuracy. Even if the addition of multiple dual infrared camera assemblies increases the weight of the device, the ingenious design of multiple structures ensures that the test subject is comfortable to wear. Attached Figure Description

[0044] Figure 1 It is a structural diagram of the utility model;

[0045] Figure 2 This is a schematic diagram of the usage state of this utility model;

[0046] Figure 3 This is an exploded view of the device housing structure of this utility model;

[0047] Figure 4 This is a partial schematic diagram of the back of the device of this utility model;

[0048] Figure 5 This is an exploded view of the suspension connecting frame in the device of this utility model;

[0049] Figure 6 for Figure 5 Enlarged view of part A;

[0050] Figure 7 This is a schematic diagram showing the installation of the suspension connector and the elastic nose pad;

[0051] Figure 8 This is a schematic diagram illustrating the compatibility of the device of this utility model with eyeglasses.

[0052] In the figure,

[0053] 1. Main body of the head-mounted device;

[0054] 11. Core functional unit; 12. Support leg; 121. Through-loop; 13. TF card slot; 14. TOF sensor; 15. Elastic band; 16. Light sensor; 101. Functional unit housing; 1011. Rib; 102. Support leg housing; 103. Left support leg back plate; 104. Middle back plate; 1041. Rubber pad; 105. Right support leg back plate;

[0055] 2. Suspension connecting frame;

[0056] 21. Front housing of connecting frame; 22. Back plate of connecting frame; 221. Nose pad mounting groove; 23. Rotating shaft; 231. First abutment surface; 232. Second abutment surface; 233. Rotation opening; 234. Gap; 24. Fastening bolt; 25. Polygonal nut;

[0057] 3. Dual infrared camera assembly;

[0058] 31. Support rod; 32. Connecting rod; 321. Shaft groove; 3211. Groove edge; 33. Infrared camera; 34. Infrared supplementary light;

[0059] 4. Elastic nose pads;

[0060] 41. Connecting and fixing part; 42. Strip hole; 43. Nose bridge support part;

[0061] 5. Control box;

[0062] 6. Eyeglasses. Detailed Implementation

[0063] To better understand the purpose, technical solution, and technical effects of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will provide further explanation. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need further definition and explanation in subsequent drawings. It is also stated that the embodiments described below are only for explaining this utility model and are not intended to limit it.

[0064] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intermediate component.

[0065] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed when in use, or the orientation or positional relationship in which a person skilled in the art would normally understand it, or the orientation or positional relationship in which the product is usually placed when in use. It is only for the purpose of facilitating the description of this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0066] The terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features. “Several” means two or more, unless otherwise expressly and specifically defined.

[0067] Example 1

[0068] like Figures 1 to 3 As shown, a portable eye fatigue detection device with an infrared camera includes:

[0069] The main body of the head-mounted device 1 is detachable and can be worn on the forehead of the test subject.

[0070] The suspension connector 2 has one end positioned at the lower center of the head-mounted device body 1, and the other end extending downwards and beyond the subject's eyes in a direction away from the subject, so that the suspension connector 2 is tilted outwards and positioned below the head-mounted device body 1. The suspension connector 2 provides an angle that does not interfere with the field of vision for mounting the dual infrared camera assembly 3.

[0071] The dual infrared camera assembly 3 is located at the other end of the suspension connector 2. When the subject wears the head-mounted device 1, the horizontal height of the dual infrared camera assembly 3 is below the horizontal height of the subject's eyes, and the two infrared cameras 33 of the dual infrared camera assembly 3 take pictures of the subject's two eyes from bottom to top to capture the subject's eye images.

[0072] This embodiment of the portable eye fatigue detection device with infrared cameras utilizes the structure of a head-mounted main body 1, a suspension connecting frame 2, and dual infrared camera components 3 to make the device wearable. Users can perform eye fatigue detection anytime and anywhere without relying on a specific environment or professional settings. After the device is worn, the suspension connecting frame 2 places the two camera lenses of the dual infrared camera components 3 in front of the subject's eyes at a very close distance. This eliminates the need for a complicated alignment and adjustment process, allowing the lenses to be aligned with the eyes and the detection to begin, greatly simplifying the operation process. Since the dual infrared cameras 33 are fixed in a stable position below the eyes and shoot at the eyes from below, they do not obstruct the subject's forward field of vision, allowing users to continue their daily activities while using the device.

[0073] In this embodiment, the head-mounted device body 1 includes a core functional part 11 located in the middle and two support legs 12 located on both sides. The ends of the support legs 12 are provided with loops 121, and the loops 121 of the two support legs 12 are respectively connected to the two ends of an elastic band 15. The elastic band 15 is provided with an adjustment ring, which allows adjustment of the length of the elastic band 15, thereby adjusting the wearing size of the head-mounted device body 1 to accommodate users with different head circumferences, ensuring wearing comfort and stability. In other optional embodiments, the loops 121 of the two support legs 12 are respectively connected to fastening straps with Velcro.

[0074] The core functional unit 11 in the middle of the head-mounted device body 1 houses core electronic components, including a processing chip, to perform multiple functions, including data processing, data storage, and data transmission of images acquired by the infrared camera. The core functional unit 11 in the middle of the head-mounted device body 1 is larger than the size of the two side legs 12. The core functional unit 11 has a large housing chamber and a built-in main board. The main board integrates at least a processing chip, memory, and flash memory. The processing chip is used to process data collected from the dual infrared camera assembly 3 and to execute image processing algorithms and other related computational tasks. The memory is used to temporarily store running data and programs. The flash memory is used to store firmware parameters, configuration file parameters, and preset parameters.

[0075] The core functional unit 11 also includes a TF card slot 13, which is used to insert a TF card (i.e., a memory card) to store detection data, images, and other relevant information. The TF card slot 13 supports hot-swapping, making it convenient for users to replace or retrieve data.

[0076] The motherboard also integrates a WiFi module, a 4G / 5G module, and a Bluetooth module. The WiFi module supports uploading detection data to cloud services via WiFi network; the 4G / 5G module provides cellular network connectivity so that data can be transmitted even without WiFi; and the Bluetooth module enables short-range wireless communication with smartphones or other mobile devices, facilitating real-time data viewing or device settings.

[0077] The core functional unit 11 also includes a Time-of-Flight (TOF) sensor 14. The TOF sensor 14 is positioned directly in front of the head-mounted device 1, i.e., in the direction of the wearer's gaze. It is used to monitor the environment in front of the device, providing distance and depth information to help the system better understand the user's position, thereby optimizing the performance of the infrared camera components. For example, when a user looks down at a book, if the TOF sensor 14 detects an approaching obstacle, the system can trigger a pause in detection and remind the user to look up, avoiding false detections and obtaining more accurate results.

[0078] One end of one of the support legs 12 of the head-mounted device body 1 is equipped with a TYPE-C interface, through which a power supply box or a control box 5 is connected. The power supply box, also known as a portable charger, ensures sufficient battery life for the device. The control box 5 not only provides power management functions but also allows users to perform various controls on the head-mounted device body 1, including:

[0079] Power-on control – The main body of the head-mounted device 1 is activated via buttons or touchscreen operation on the control box 5;

[0080] Power-off control – The main body of the head-mounted device 1 can be turned off via buttons or touch screen operation on the control box 5;

[0081] Start detection -- Start eye fatigue detection via the button on control box 5 or the application interface;

[0082] Pause / Resume Detection -- During the detection process, users can choose to pause the detection and resume it when needed;

[0083] Parameter settings -- Adjust the detection parameters, such as detection time, data sampling frequency, etc.;

[0084] Mode selection – Offers different detection modes, such as standard mode, rapid detection mode, or long-term monitoring mode;

[0085] The standard detection mode is suitable for routine eye fatigue detection, and continuous detection is performed according to a preset time period (such as 5 minutes, 10 minutes, etc.). The indicators include average pupil diameter, pupil fluctuation degree, pupil adaptation speed, percentage of eye closure, and blink parameters (blink time and frequency). The rapid detection mode is suitable for quickly assessing eye fatigue status in a short period of time, usually completed within 1-3 minutes. It mainly focuses on key indicators such as average pupil diameter, blink frequency, and percentage of eye closure. The long-term monitoring mode is suitable for fatigue monitoring after long periods of work or study, lasting for several hours. In the long-term monitoring mode, all parameters are recorded, and a report is generated at regular intervals.

[0086] The control functions provided by control box 5 also include:

[0087] Data transmission – Automatically uploads detection data to cloud services via WiFi or cellular network for remote access and backup; saves data locally to TF card;

[0088] Data synchronization – Synchronize data with other devices, such as smartphones, via Bluetooth or Type-C.

[0089] In other alternative embodiments, a USB interface is provided at the end of one of the support legs 12 of the head-mounted device body 1, through which data is synchronized to a computer.

[0090] In this embodiment, the housing of the portable eye fatigue detection device with infrared camera includes a front shell and a back plate, which are fastened together and fixed with screws. A fastening protrusion is provided near the edge of the inner wall of the front shell, and a fastening hole is provided along the edge of the back plate. The fastening protrusion and the fastening hole are detachably fastened together. Several sets of screw seats are provided on the inner wall of the front shell, and several screw holes are provided on the back plate corresponding to the screw seats. Screws pass through the screw holes and are fastened to the screw seats.

[0091] like Figure 3As shown, the front shell includes an integrally formed functional housing 101 and two support housings 102 located on both sides, with a connecting frame front housing 21 integrally formed at the lower center of the functional housing 101. The back plate includes a left support back plate 103, a middle back plate 104, a right support back plate 105, and a connecting frame back plate 22. The left support back plate 103 and the right support back plate 105 correspond to the two support housings 102, the middle back plate 104 corresponds to the functional housing 101, and the connecting frame back plate 22 corresponds to the connecting frame front housing 21. The functional housing 101 consists of a top plate, a front plate, and a bottom plate, forming a C-shaped receiving cavity with an opening on one side. The top plate has several heat dissipation holes and slots. The front plate has a sensor sensing cutout in the middle, and several heat dissipation holes are also provided on both sides of the sensor sensing cutout. The bottom plate has a notch in the middle, and the connecting frame front housing 21 is connected to the notch. Several heat dissipation holes are also provided on both sides of the notch. The aforementioned heat dissipation holes provide airflow channels for the C-shaped cavity and are arranged around the core electronic components, ensuring that air can enter and exit the C-shaped cavity from different directions, thus improving the heat dissipation efficiency of the core electronic components. The aforementioned sensor sensing cutout serves as the sensing window of the TOF sensor 14, ensuring that the TOF sensor 14 can accurately sense the surrounding environment. The aforementioned notch in the base plate provides a passage for the connecting wires of the dual infrared camera assembly 3. The connecting wires of the dual infrared camera assembly 3 first pass through the cavity inside the suspension connector 2, then enter the C-shaped cavity through the notch, and finally connect to the main board.

[0092] The support housing 102, which connects to the support leg 12 of the power supply box or control box 5, has a flexible circuit board on its inner top wall. The flexible circuit board connects the main board and the interface board, which is a TYPE-C interface board or a USB interface board. The functional housing 101, near the support leg 12 connected to the power supply box or control box 5, has a wire-embedded channel. The connection wires between the flexible circuit board and the main board are located within this channel. The wire-embedded channel is formed by the gaps between several parallel ribs 1011, which not only provides multiple parallel and orderly wiring paths, reducing signal transmission interference, but also enhances the structural strength of the front housing, improving the rigidity and durability of the device.

[0093] The junction between the functional housing 101 and the support housing 102 has a rounded transition housing section. The rounded transition housing section is used to disperse stress and reduce stress concentration caused by hard corners, thereby improving the overall structural strength. The smooth rounded transition also helps to make the entire device look more integrated and beautiful.

[0094] The central backplate 104, left support leg backplate 103, and right support leg backplate 105 are all arc-shaped. The two ends of the central backplate 104 extend to the junction of the functional housing 101 and the support leg housing 102, while the left support leg backplate 103 and right support leg backplate 105 only cover the corresponding side of the support leg housing 102. This rounded transition reduces pressure on the user's forehead from sharp angles, improving wearing comfort. The backplate is preferably made of thermoplastic polyurethane, which has good elasticity and flexibility, strong wear resistance, and a long service life. The surface of the central backplate 104 is provided with several rubber pads 1041 or silicone pads, providing greater elasticity and further enhancing the wearing comfort of the device.

[0095] Example 2

[0096] like Figures 4 to 6 As shown, a portable eye fatigue detection device with infrared camera has the same structure as Embodiment 1, including a head-mounted device body 1, a suspension connecting frame 2, and a dual infrared camera assembly 3. The suspension connecting frame 2 is tilted outward and located in the middle position below the head-mounted device body 1, and the dual infrared camera assembly 3 is located at the bottom end of the suspension connecting frame 2.

[0097] The device in this embodiment is further optimized based on Embodiment 1. Specifically, the dual infrared camera assembly 3 includes a hollow support rod 31 and a connecting rod 32. The connecting rod 32 is connected to the bottom end of the suspension connecting frame 2. The support rod 31 is vertically connected to the connecting rod 32 and is horizontally arranged. The support rod 31 has a symmetrical structure, with a camera mounting base at each end. The center distance between the two camera mounting bases is 54 mm to 74 mm. Each camera mounting base is equipped with an infrared camera 33. The two infrared cameras 33 respectively capture images of the left and right eyes of the subject. The two infrared cameras 33 can work independently, allowing only one eye of the subject to be captured.

[0098] An infrared fill light 34 is located on the side of each camera mount to provide additional illumination in low-light or completely dark environments, enabling the infrared camera 33 to capture images of the clean eye. The light emitted by the infrared fill light 34 is infrared light, invisible to the human eye, but can be captured by the infrared camera 33.

[0099] The connecting rod 32 is vertically positioned in the middle of the support rod 31, and the infrared fill light 34 is located between the connecting rod 32 and the camera mounting base on the same side. The other end of the connecting rod 32 is hinged to the bottom end of the suspension frame 2, and a fastening bolt 24 is provided at the hinge. The dual infrared camera assembly 3 achieves fine-tuning of the shooting angle through the hinge structure between its connecting rod 32 and the suspension frame 2. Rotating the connecting rod 32 changes the shooting angle of the infrared cameras 33 on both sides of the support rod 31, allowing for shooting at a better desired angle and ultimately obtaining more accurate detection results. After adjusting the rotation angle of the dual infrared camera assembly 3, the fastening bolt 24 is tightened to fix the connecting rod 32 to the suspension frame 2. In this embodiment, the adjustable angle of the dual infrared camera assembly 3 on the suspension frame 2 is 90°. It should be noted that since the infrared cameras 33 are close to the eye and can already capture eye image data, the angle adjustment here is merely a fine-tuning operation to further optimize the shooting effect.

[0100] like Figure 6 As shown, in this embodiment, the connecting rod 32 is a flat rectangular body with a hollow interior. Its end has a shaft groove 321, which communicates with the inner cavity of the connecting rod 32. The bottom of the suspension connecting frame 2 has a rotating shaft 23, the shape of which matches the shaft groove 321. The rotating shaft 23 has a through hole. The rotating shaft 23 is inserted into the shaft groove 321, and the fastening bolt 24 passes through the side wall of the shaft groove 321 and the through hole of the rotating shaft 23, achieving a rotatable connection between the rotating shaft 23 and the shaft groove 321. The rotating shaft 23 is a cylinder. A fan-shaped ring structure is cut off from the side of the cylinder, so that a fan-shaped groove is formed on the side of the cylindrical rotating shaft 23, which serves as the rotation port 233 on the side of the rotating shaft 23. The rotation port 233 has a first abutment surface 231 and abutment surface 232. The first abutment surface 231 and the second abutment surface 232 are parallel to the axis of the rotating shaft 23. The groove edge 3211 on the shaft groove 321, which is parallel to the axial direction, includes a first groove edge and a second groove edge. The first groove edge and the second groove edge correspond to the first abutment surface 231 and the second abutment surface 232, respectively. As the rotating shaft 23 rotates in the shaft groove 321, when the first groove edge contacts the first abutment surface 231, the connecting rod part 32 rotates around the bottom end of the suspension connecting frame 2 to the first limit position; when the second groove edge contacts the second abutment surface 232, the connecting rod part 32 rotates around the bottom end of the suspension connecting frame 2 to the second limit position. The rotation angle of the connecting rod part 32 between the first limit position and the second limit position is an adjustable angle.

[0101] In other alternative embodiments, the adjustable angle of the dual infrared camera assembly 3 on the suspension bracket 2 is 40°, 60° or 120°.

[0102] The outer sides of the two side walls of the shaft groove 321 are respectively provided with a circular groove and a polygonal groove. The fastening bolt 24 is inserted into the shaft groove 321 from one side of the circular groove, then passes through the through hole of the rotating shaft 23, and finally comes out from one side of the polygonal groove. After being tightened with the polygonal nut 25, the fastening is completed. At this time, the polygonal nut 25 is placed in the polygonal groove, and the bolt head of the fastening bolt 24 is placed in the circular groove.

[0103] In this embodiment, a gap 234 is formed between the first contact surface 231 of the rotating opening 233 of the shaft 23 and the front housing 21 of the connecting frame. The connecting wire of the dual infrared camera assembly 3 passes through the hollow support rod 31 and connecting rod 32, and then passes through the gap 234 into the cavity of the suspension connecting frame 2. The first groove edge of the shaft groove 321 is a rounded edge, which can reduce the sharpness of the first groove edge, thereby ensuring that the connecting wire will not be cut during the rotation of the shaft 23 and the shaft groove 321.

[0104] Example 3

[0105] like Figure 2 and Figure 7 As shown, a portable eye fatigue detection device with infrared camera has the same structure as Embodiment 2, including a head-mounted device body 1, a suspension connecting frame 2, and a dual infrared camera assembly 3. The suspension connecting frame 2 is tilted outward and located in the middle position below the head-mounted device body 1. The dual infrared camera assembly 3 is located at the bottom end of the suspension connecting frame 2. The device in this embodiment is further optimized based on Embodiment 2.

[0106] Specifically, the vertical distance L from the top back of the suspension connector 2 to the back plate of the head-mounted device 1 is 5 to 10 millimeters, and the tilt angle a of the back of the suspension connector 2 is 10° to 15°, so that there is enough space between the top back of the suspension connector 2 and the brow bone of the test subject to accommodate the frame of the myopia glasses 6. At the same time, the suspension connector 2 is tilted at a certain distance away from the test subject at its top to ensure that the suspension connector 2 will not hit the bridge of the nose of the test subject even at a small tilt angle.

[0107] As shown in Embodiment 1, the housing of the suspension connector 2 includes a front housing 21 and a back plate 22, which are assembled to form a hollow suspension connector 2. The back plate 22 is provided with a nose pad mounting groove 221, and an elastic nose pad 4 can be detachably mounted in the nose pad mounting groove 221. The suspension connector 2 is supported on the bridge of the subject's nose by the elastic nose pad 4, which is beneficial to the stability of the device when worn, and the elastic nose pad 4 is soft, which can improve the comfort of wearing.

[0108] like Figure 7As shown, the elastic nose pad 4 includes an integrally formed connecting and fixing part 41 and a nose bridge supporting part 43. The nose bridge supporting part 43 is formed by folding and extending the end of the connecting and fixing part 41 and is perpendicular to the connecting and fixing part 41. The connecting and fixing part 41 has a strip-shaped hole 42, and the nose pad mounting groove 221 has several screw holes. The strip-shaped hole 42 has round holes at the positions corresponding to the screw holes. The round holes are arranged along the length direction of the strip-shaped hole 42, and the width of the round holes is greater than the width of the strip-shaped hole 42. Several screws are passed through the corresponding round holes and screw holes in sequence and tightened. The strip-shaped hole 42 deforms under the screw extrusion force, so that the extrusion force is released at the strip-shaped hole 42 and will not be transmitted to the outside of the connecting and fixing part 41. Therefore, the connecting and fixing part 41 of the elastic nose pad 4 will not deform or shift during installation, and the nose bridge supporting parts 43 on both sides are symmetrically and stably supported on the nose bridge of the test subject.

[0109] The end of the nose bridge support portion 43 extends below the nose pad of the test subject's glasses 6, and the nose bridge support portion 43 is turned outward so that the outer side of the nose bridge support portion 43 abuts against the two frames of the glasses 6 respectively. When the test subject wears the portable eye fatigue detection device with infrared camera of this embodiment while wearing glasses 6, both the nose pad of glasses 6 and the nose bridge support portion 43 of the elastic nose pad 4 are in contact with the nose bridge of the test subject. In this way, the weight of the device is transferred to the nose bridge through its elastic nose pad 4, rather than the weight of the device and the weight of glasses 6 being transferred through the nose pad of glasses 6. Therefore, the nose bridge support portion 43 of this embodiment increases the contact area between the device and the nose bridge of the test subject, reduces pressure, and avoids wearing discomfort.

[0110] As can be seen, the optimized nose pad structure of the portable eye fatigue detection device with infrared camera ensures compatibility with glasses 6, preventing discomfort on the bridge of the nose caused by prolonged wear and increasing wearing comfort for test subjects wearing glasses 6. The softness of the elastic nose pad 4 can also adapt to different users' nose shapes, ensuring a better wearing experience for each user. This embodiment is also more suitable for test subjects who need to wear the device for eye fatigue detection for extended periods.

[0111] Example 4

[0112] like Figure 4 As shown, a portable eye fatigue detection device with infrared camera has the same structure as Embodiment 2, including a head-mounted device body 1, a suspension connecting frame 2, and a dual infrared camera assembly 3. The suspension connecting frame 2 is tilted outward and located in the middle position below the head-mounted device body 1, and the dual infrared camera assembly 3 is located at the bottom end of the suspension connecting frame 2.

[0113] The dual infrared camera assembly 3 includes a hollow support rod 31 and a connecting rod 32. The connecting rod 32 is connected to the bottom end of the suspension frame 2. The support rod 31 is vertically connected to the connecting rod 32. An infrared camera 33 is provided at each end of the support rod 31, and the two infrared cameras 33 respectively capture images of the left and right eyes of the subject. The center distance between the two infrared cameras 33 is 54 mm to 74 mm.

[0114] The connecting rod 32 is provided with a shaft groove 321, which is connected to the inner cavity of the connecting rod 32. The connecting wires of the two infrared cameras 33 pass through the hollow support rod 31, the hollow connecting rod 32, the shaft groove 321, and the hollow suspension connecting frame 2 in sequence, and finally enter the head-mounted device body 1 and connect to the working main board.

[0115] In addition to the manually rotating dual infrared camera assembly 3 provided in Embodiment 2, this embodiment also provides an electrically controlled rotating dual infrared camera assembly 3. Specifically, the bottom end of the suspension connecting frame 2 is provided with a rotating shaft 23, which is rotatably connected to the shaft groove 321. The rotating shaft 23 is controlled by a servo motor. The servo motor can be installed inside the suspension connecting frame 2, or the size of the connecting rod 32 can be increased to install the servo motor. The connecting wire of the servo motor passes through the inner cavity of the suspension connecting frame 2 and enters the head-mounted device body 1 to connect with the main working board. The electrically controlled rotating dual infrared camera assembly 3 does not require fastening bolts at the rotating shaft; it can be fixed by the control of the servo motor.

[0116] In this embodiment, the lower surface of the head-mounted device body 1 is equipped with photosensors 16 corresponding to the two infrared cameras 33. Each photosensor 16 is used to sense the infrared light from the infrared camera 33 on the same side. It has a built-in infrared photodiode and an infrared photoresistor, and the resistance value changes with the intensity of the infrared light. The photosensor 16 outputs different current signals. When adjusting the angle of the dual infrared camera assembly 3, the elevation angle of the infrared camera 33 changes, and the intensity of the infrared light sensed by the photosensor 16 increases. When it reaches a preset value, it sends a signal to the main board, indicating that the elevation angle of the infrared camera 33 is appropriate, and stops adjusting the dual infrared camera assembly 3. As mentioned above, if the device is configured with a manually rotating dual infrared camera assembly 3, the device system can remind the user to stop rotating through an indicator light or sound; if the device is configured with an electrically controlled rotating dual infrared camera assembly 3, the device system directly controls the servo motor to stop moving through signal feedback.

[0117] In a preferred embodiment, a control box 5 is detachably connected to one side of the support leg 12. Since the dual infrared camera assembly 3 has an electrically controlled rotating structure, the control box 5 not only has the following control functions: power-on control, power-off control, power-on detection, pause / resume detection, parameter setting, mode selection, data transmission, and data synchronization, but also has the function of controlling the rotation adjustment of the dual infrared camera assembly 3. Specifically, the control box 5 is equipped with a forward rotation key and a reverse rotation key. When the user presses the forward rotation key, the connecting rod 32 of the dual infrared camera assembly 3 rotates downwards around the bottom end of the suspension bracket 2, increasing the shooting elevation angle of the infrared camera 33. When the user presses the reverse rotation key, the dual infrared camera assembly 3 rotates in the opposite direction, decreasing the shooting elevation angle of the infrared camera 33.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A portable eye fatigue detection device with an infrared camera, characterized in that, The device includes a head-mounted device body, a suspension frame, and a dual infrared camera assembly. The head-mounted device body is detachably worn on the forehead of the subject. The suspension frame is tilted and positioned below the center of the head-mounted device body. The dual infrared camera assembly is located at the bottom of the suspension frame, with the two infrared cameras of the dual infrared camera assembly shooting from bottom to top. The head-mounted device body has a built-in processing chip for receiving, processing, and analyzing the eye images captured by the infrared cameras.

2. The portable eye fatigue detection device with infrared camera according to claim 1, characterized in that, The mainboard inside the head-mounted device integrates a WiFi module, a 4G / 5G module, and a Bluetooth module. The WiFi module is used to upload detection data to a cloud service via a WiFi network, the 4G / 5G module is used to provide cellular network connectivity for data transmission, and the Bluetooth module is used to wirelessly connect to smart mobile devices with Bluetooth signals.

3. The portable eye fatigue detection device with infrared camera according to claim 1, characterized in that, The main body of the head-mounted device includes a core functional unit located in the middle and support legs located on both sides. The core functional unit is equipped with a TOF sensor, and the detection direction of the TOF sensor is facing the front of the main body of the head-mounted device.

4. The portable eye fatigue detection device with infrared camera according to claim 1, characterized in that, The device housing includes a front shell and a back plate. The front shell includes an integrally formed functional part shell and support leg shells located on both sides. A connecting frame front shell is integrally formed in the lower middle of the functional part shell. The functional unit housing consists of a top plate, a front plate, and a bottom plate, forming a C-shaped receiving cavity with an opening on one side; The base plate has a notch located in the middle and connected to the front housing of the connecting frame; the connecting wire of the dual infrared camera assembly enters the cavity inside the suspension connecting frame, passes through the notch, is introduced into the C-shaped receiving cavity, and connects to the working main board.

5. The portable eye fatigue detection device with infrared camera according to claim 1, characterized in that, The dual infrared camera assembly includes a hollow support rod and a connecting rod. The connecting rod is connected to the bottom end of the suspension frame. The support rod is vertically connected to the connecting rod and is horizontally arranged. The support rod has a symmetrical structure with a camera mounting base at each end. Each camera mounting base is equipped with an infrared camera. The two infrared cameras respectively capture images of the subject's left and right eyes.

6. The portable eye fatigue detection device with infrared camera according to claim 5, characterized in that, An infrared fill light is provided on the side of each of the camera mounts, and the infrared fill light is located between the connecting rod and the camera mount on the same side.

7. The portable eye fatigue detection device with infrared camera according to claim 5, characterized in that, The connecting rod is hinged to the bottom end of the suspension frame, and a fastening bolt is provided at the hinge. The dual infrared camera assembly achieves fine adjustment of the shooting angle through the hinge structure between its connecting rod and the suspension frame.

8. The portable eye fatigue detection device with infrared camera according to claim 7, characterized in that, The dual infrared camera assembly can be adjusted at an angle of 90° on the suspension bracket.

9. The portable eye fatigue detection device with infrared camera according to claim 5, characterized in that, The connecting rod is a hollow structure with a shaft groove at its end, which communicates with the inner cavity of the connecting rod. The bottom of the suspension connecting frame is provided with a rotating shaft, which rotates within the shaft groove. The fastening bolt passes through the side wall of the shaft groove and the through hole of the rotating shaft.

10. The portable eye fatigue detection device with infrared camera according to claim 9, characterized in that, The rotating shaft has a rotating opening on its side, and the rotating opening has a first abutting surface and a second abutting surface, the first abutting surface and the second abutting surface being parallel to the axis of the rotating shaft; the shaft groove has a first groove edge and a second groove edge parallel to the axial direction corresponding to the first abutting surface and the second abutting surface, respectively. When the rotating shaft rotates relative to the shaft groove until the edge of the first groove contacts the first abutting surface, the connecting rod rotates around the bottom end of the suspension connecting frame to a first limit position; when the rotating shaft rotates relative to the shaft groove until the edge of the second groove contacts the second abutting surface, the connecting rod rotates around the bottom end of the suspension connecting frame to a second limit position.

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