Head-mounted device-based visual interaction system for young children

Abstract

The invention relates to the technical field of visual interaction systems, in particular to a visual interaction system for young children based on head-mounted equipment, which comprises a display module, a signal processing module and a signal acquisition module, and is characterized in that the display module presents a stimulation normal form for auxiliary diagnosis and a stimulation scene for auxiliary treatment by utilizing an augmented reality technology; the signal acquisition module is used for acquiring electroencephalogram information of the user and sending the electroencephalogram information to the signal processing module; according to the visual interaction system, visual function defect detection can be achieved through the display module in cooperation with electroencephalogram information collection and analysis without depending on language expression feedback of the examined person, and therefore the visual interaction system is more suitable for visual function examination of young children.

Description

Technical Field

[0001] The present invention relates to the technical field of visual interaction systems, and particularly to a visual interaction system for low-age children based on a head-mounted device. Background Art

[0002] Common clinical ophthalmic diseases such as amblyopia and strabismus can cause visual function defects in patients. Visual function defect refers to any functional damage in the visual conduction pathway, including both organic lesions of the eyes and neurological abnormalities in the subsequent processes of the eyes. Common visual function defects include decreased visual acuity, visual field defect, loss of stereoscopic vision, etc., which greatly affect the normal life of patients. Currently, the examination of patients' visual function defects in clinical ophthalmology is mainly through some psychophysical methods, which rely on the subjective reports of patients or physicians. For example, in the visual acuity chart examination, the patient is required to subjectively judge whether they can recognize the orientation of the letters. This subjective examination method has two problems: one is that these methods are not applicable to low-age children with weak expressive abilities, and the treatment of visual function defects should be carried out as early as possible for better results; the other is that these methods are greatly affected by the subjective factors of patients and doctors, and it is difficult to be objective and quantitative, which affects the accuracy of the examination results and also affects the formulation of subsequent treatment plans. Summary of the Invention

[0003] The purpose of the present invention is to provide a visual interaction system for low-age children based on a head-mounted device to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A visual interaction system for low-age children based on a head-mounted device, including a display module, a signal processing module, and a signal acquisition module. The display module uses extended reality technology to present a stimulus paradigm for auxiliary diagnosis and a stimulus scene for auxiliary treatment to induce the steady-state visual evoked potential of the user. The brain electrical information of the user is collected by the signal acquisition module and sent to the signal processing module. The signal processing module uses an algorithm to process the received brain electrical signals, extract the characteristic information corresponding to the visual function defect, and form the result of objective and quantitative auxiliary examination, and at the same time feedback it to the display module. The display module then realizes the automatic setting of the stimulus parameters according to this result. The display module includes an extended reality display, a headband, a wearing detection sensor, and a protective front mirror. The extended reality display is fixedly connected to the headband. A wearing detection sensor for detecting whether it is worn is embedded on the extended reality display. A protective front mirror is arranged inside the extended reality display.

[0005] Preferably, a total of two groups of the front protective lenses are provided. A closed connecting pipe and a heating connecting part are connected between the two groups of the front protective lenses. A sandwich surface cavity is formed in the front protective lens. Both ends of the closed connecting pipe are communicated with the sandwich surface cavity. A temperature-rising flow channel is formed in the heating connecting part. Both ends of the temperature-rising flow channel are communicated with the sandwich surface cavity. A liquid bath electric heating wire is arranged in the temperature-rising flow channel.

[0006] Preferably, a shaft-end top frame is fixedly arranged inside the closed connecting pipe. A fixed top shaft is fixedly arranged on the shaft-end top frame. A rotating main shaft is rotationally arranged outside the fixed top shaft in a limited manner. The rotating main shaft corresponds coaxially to the closed connecting pipe.

[0007] Preferably, a driving blade is fixedly arranged on the surface of the rotating main shaft. A main shaft wing rod is fixedly arranged on the rotating main shaft. A wing-rod end plate is fixedly arranged at the end of the main shaft wing rod. A driven magnet is fixedly attached to the wing-rod end plate. An outer-wall rotating sleeve is sleeved outside the closed connecting pipe. An attracting magnet is embedded and installed on the inner surface of the outer-wall rotating sleeve. The attracting magnet is magnetically matched with the driven magnet. When the outer-wall rotating sleeve rotates, the rotating main shaft can be driven to rotate through the magnetic matching. A clamping ring is fixedly arranged on the surface of the closed connecting pipe. The clamping ring performs axial limit on the outer-wall rotating sleeve.

[0008] Preferably, a worm gear ring is fixedly arranged on the surface of the outer-wall rotating sleeve. A worm part is meshed outside the worm gear ring. A worm motor for driving the worm part to rotate is arranged on one side of the worm part. The worm motor is fixedly installed on the housing of the extended reality display.

[0009] Preferably, a wave-shaped shifting tooth is fixedly arranged on the outer-wall rotating sleeve. A piston air cylinder is fixedly arranged in the extended reality display. A piston square shaft is arranged in the piston air cylinder. When the piston square shaft axially moves, a positive-pressure air flow will be generated in the piston air cylinder. An extrusion switching shaft is inserted into the piston square shaft. A limiting wall rib is fixedly arranged on the surface of the extrusion switching shaft. The limiting wall rib and the piston square shaft cooperate to limit the extrusion switching shaft, so that the extrusion switching shaft can only move axially.

[0010] Preferably, when the extrusion switching shaft extends towards the direction where the wave-shaped shifting tooth is located, the extrusion switching shaft can be in extrusion cooperation with the wave-shaped shifting tooth. At this time, when the wave-shaped shifting tooth rotates, it will extrude and push the extrusion switching shaft, so that the piston square shaft axially moves.

[0011] Preferably, a magnetic attracting back plate is fixedly arranged at the end of the extrusion switching shaft. A spring is arranged between the magnetic attracting back plate and the piston square shaft. An electromagnet module is fixedly arranged on the piston square shaft. After the electromagnet module is powered on, it can be magnetically matched with the magnetic attracting back plate.

[0012] Preferably, an air delivery pipe is communicatively connected to the air outlet of the piston air cylinder, an external air cavity is formed in the heating connection part, and the other end of the air delivery pipe is communicatively connected to the external air cavity.

[0013] Preferably, a gas heating wire is arranged in the external air cavity, guiding air grooves are respectively formed on both sides of the external air cavity, and the outer openings of the guiding air grooves face the center position of the surface of the front protective lens.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The visual interaction system of the present invention can detect visual function defects by cooperating with the display module to collect and analyze electroencephalogram information without relying on the verbal feedback of the examinee, so it is more suitable for visual function examination of young children. Compared with the traditional detection process of expression and communication, the detection results are more objective and regular.

[0015] In the extended reality display of the visual interaction system of the present invention, through the cooperation of structures such as the sandwich surface cavity, the closed connecting pipe and the heating flow channel, the liquid in the sandwich surface cavity can be driven to circulate between the two front protective lenses and heated through the heating flow channel, so as to heat the front protective lenses. When used in a low-temperature environment such as winter, it avoids the problem that the water film on the surface of the eyeball is evaporated by body temperature and condensed on the surface of the front protective lenses, resulting in water mist blocking, and improves the use effect of the extended reality display.

[0016] Through the cooperation of structures such as the external air cavity, the piston air cylinder and the extrusion switching shaft, when the extended reality display is powered on, the rotation of the outer wall rotating sleeve can be used to cooperate with the piston air cylinder to generate positive-pressure gas, and the gas is heated and directly blown on the outer surface of the front protective lens to improve the preheating rate of the front protective lens. After the wearing detection sensor detects the wearing, the extrusion switching shaft automatically retracts, stops blowing and heating, avoids the discomfort such as dry eyes caused by the air flow to the surface of the eyeball, and at the same time, when the extrusion switching shaft retracts, the rotation load of the outer wall rotating sleeve is reduced. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the visual interaction system of the present invention.

[0018] Figure 2 It is a schematic diagram of the display module of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the front protective lens of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure at the piston square shaft of the present invention.

[0021] Figure 5 It is another perspective schematic diagram of the structure of the front protective lens of the present invention.

[0022] Figure 6 This is a schematic half-section view of the protective front mirror of the present invention.

[0023] Figure 7 is Figure 6 an enlarged view of part A in

[0024] Figure 8 a schematic half-section view of the external air cavity.

[0025] Figure 9 a schematic half-section view of the cross-section at the heating connection part.

[0026] In the figure: 1, display module; 2, signal processing module; 3, signal acquisition module; 4, extended reality display; 5, headband; 6, wearing detection sensor; 7, protective front mirror; 8, closed connecting pipe; 9, heating connection part; 10, sandwich layer cavity; 11, temperature-rising flow channel; 12, liquid bath electric heating wire; 801, shaft end support; 802, fixed top shaft; 803, rotating main shaft; 804, driving blade; 805, main shaft wing rod; 806, wing rod end plate; 807, driven magnet; 808, outer wall rotating sleeve; 809, attracting magnet; 810, clamping ring; 811, worm gear ring; 812, worm part; 813, worm motor; 814, wave-shaped pick teeth; 815, piston air cylinder; 816, piston square shaft; 817, extrusion switching shaft; 818, limiting wall edge; 819, magnetic absorption back plate; 820, spring; 821, electromagnet module; 822, air pipe; 901, external air cavity; 902, gas heating wire; 903, directional air groove. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1 to 9 , the present invention provides a technical solution: a visual interaction system for low-age children based on a head-mounted device, such as Figure 1As shown in the figure, it includes a display module 1, a signal processing module 2, and a signal acquisition module 3. The display module 1 uses extended reality technology to present the stimulation paradigm for auxiliary diagnosis and the stimulation scenario for auxiliary treatment to induce the steady-state visual evoked potential of the user. Extended reality technology refers to combining the real and the virtual through a computer to create a virtual environment for human-computer interaction. The display module 1 can be a VR glasses in the prior art. The steady-state visual evoked potential means that when an external visual stimulus with a constant frequency is applied, the neural network in the brain that is consistent with the stimulus frequency or harmonic frequency will resonate, resulting in a significant change in the brain's electrical potential activity at the stimulus frequency or harmonic frequency. This electrical signal is called the SSVEP signal.

[0029] The signal acquisition module 3 collects the electroencephalogram information of the user and sends it to the signal processing module 2. The signal acquisition module 3 includes an electroencephalogram headband, a signal amplifier, and a wireless transmission device. Electrodes are integrated on the electroencephalogram headband and attached to the occipital region of the head to record the physiological electrical signals of the visual cortex on the back scalp of the detected person. This signal will be transmitted to the signal processing module 2 through the signal amplifier and the wireless transmission device.

[0030] The signal processing module 2 is built on an external computer, a cloud server, or the signal acquisition module 3. The signal processing module 2 uses an algorithm to process the received electroencephalogram signal, extracts the characteristic information corresponding to visual function defects, and forms the result of an objective and quantitative auxiliary examination. At the same time, it feeds back to the display module 1, and the display module 1 then realizes the automatic setting of the stimulation parameters according to this result.

[0031] As Figure 2 shown in the figure, the display module 1 includes an extended reality display 4, a headband 5, a wearing detection sensor 6, and a protective front mirror 7. The extended reality display 4 and the headband 5 are connected and fixed. A wearing detection sensor 6 for detecting whether it is worn is embedded on the extended reality display 4, and a protective front mirror 7 is arranged inside the extended reality display 4.

[0032] There are two groups of protective front mirrors 7 in total. A closed connecting pipe 8 and a heating connecting part 9 are connected between the two groups of protective front mirrors 7. A sandwich layer cavity 10 is opened in the protective front mirror 7. Both ends of the closed connecting pipe 8 are communicated with the sandwich layer cavity 10. A heating flow channel 11 is opened in the heating connecting part 9. Both ends of the heating flow channel 11 are communicated with the sandwich layer cavity 10. A liquid bath electric heating wire 12 is arranged in the heating flow channel 11. The sandwich layer cavity 10, the closed connecting pipe 8, and the heating flow channel 11 are all filled with a colorless liquid. This colorless liquid can be pure water or a transparent oil liquid, ensuring that the light transmittance is above 99%, and at the same time avoiding the existence of air bubbles in the above-filled colorless liquid. The protective front mirror 7, the closed connecting pipe 8, the heating connecting part 9, and their surrounding structures are all located inside the extended reality display 4. They are separately listed in the drawings for easy display.

[0033] Inside the closed connecting pipe 8, a shaft end top frame 801 is fixedly arranged. On the shaft end top frame 801, a fixed top shaft 802 is fixedly arranged. A rotating main shaft 803 is rotationally arranged with external limit on the outside of the fixed top shaft 802, and the rotating main shaft 803 corresponds coaxially to the closed connecting pipe 8.

[0034] On the surface of the rotating main shaft 803, a driving blade 804 is fixedly arranged. On the rotating main shaft 803, a main shaft wing rod 805 is fixedly arranged. At the end of the main shaft wing rod 805, a wing rod end plate 806 is fixedly arranged. A driven magnet 807 is fixedly attached to the wing rod end plate 806. An outer wall rotating sleeve 808 is sleeved outside the closed connecting pipe 8. An attracting magnet 809 is embedded and installed on the inner surface of the outer wall rotating sleeve 808. The attracting magnet 809 is magnetically coupled with the driven magnet 807. When the outer wall rotating sleeve 808 rotates, the rotating main shaft 803 can be driven to rotate through magnetic coupling. A clamping ring 810 is fixedly arranged on the surface of the closed connecting pipe 8, and the clamping ring 810 performs axial limit on the outer wall rotating sleeve 808.

[0035] On the surface of the outer wall rotating sleeve 808, a worm gear ring 811 is fixedly arranged. A worm part 812 is meshed outside the worm gear ring 811. On one side of the worm part 812, a worm motor 813 for driving the worm part 812 to rotate is arranged, and the worm motor 813 is fixedly installed on the housing of the extended reality display 4.

[0036] On the outer wall rotating sleeve 808, a wave-shaped dial tooth 814 is fixedly arranged. A piston air cylinder 815 is fixedly arranged in the extended reality display 4. A piston square shaft 816 is arranged in the piston air cylinder 815. When the piston square shaft 816 moves axially, the piston air cylinder 815 will generate a positive pressure air flow. An extrusion switching shaft 817 is inserted into the piston square shaft 816. On the surface of the extrusion switching shaft 817, a limiting wall edge 818 is fixedly arranged. The limiting wall edge 818 and the piston square shaft 816 cooperate to limit the extrusion switching shaft 817, so that the extrusion switching shaft 817 can only move axially.

[0037] When the extrusion switching shaft 817 extends towards the direction where the wave-shaped dial tooth 814 is located, the extrusion switching shaft 817 can be in extrusion cooperation with the wave-shaped dial tooth 814. At this time, when the wave-shaped dial tooth 814 rotates, it will extrude and push the extrusion switching shaft 817, causing the piston square shaft 816 to move axially. The inside of the piston air cylinder 815 is composed of a piston, a return spring, and two groups of one-way air valves. The piston square shaft 816 has a reset elasticity through the support of the return spring for the piston, so as to cooperate with the extrusion, making the piston square shaft 816 and the piston in a reciprocating motion state. When the piston reciprocates, it cooperates with the two groups of one-way air valves to drive the air flow directionally, so that the piston air cylinder 815 can generate a positive pressure air flow. The above is a common piston pump structure in the prior art.

[0038] A magnetic backplane 819 is fixedly arranged at the end of the extrusion switching shaft 817. A spring 820 is arranged between the magnetic backplane 819 and the piston square shaft 816. An electromagnet module 821 is fixedly arranged on the piston square shaft 816. After the electromagnet module 821 is powered on, it can be magnetically coupled with the magnetic backplane 819.

[0039] An air delivery pipe 822 is communicated and arranged at the air outlet of the piston air cylinder 815. An outer air cavity 901 is arranged in the heating connection part 9. The other end of the air delivery pipe 822 is communicated with the outer air cavity 901.

[0040] A gas heating wire 902 is arranged in the outer air cavity 901. Pointing air grooves 903 are respectively arranged on both sides of the outer air cavity 901. The outer openings of the pointing air grooves 903 face the center position of the surface of the protective front mirror 7.

[0041] When the augmented reality display 4 in the visual interaction system of the present invention is used in a low-temperature environment such as winter, after the augmented reality display 4 is powered on, the worm motor 813 drives the worm part 812 to rotate, so that the worm part 812 drives the worm gear ring 811 to rotate. At the same time, the liquid bath heating wire 12 and the gas heating wire 902 are powered on to start heating, and the electromagnet module 821 is powered on to generate magnetic force. As Figure 7 shown in the figure, when the worm gear ring 811 rotates, it will drive the outer wall rotating sleeve 808 to rotate. The outer wall rotating sleeve 808 makes the rotating main shaft 803 rotate through the magnetic attraction between the attracting magnet 809 and the driven magnet 807. The rotating main shaft 803 drives the liquid in the closed connecting pipe 8 to flow through the driving blade 804. At this time, the liquid in the sandwich surface cavity 10 forms a circular flow cycle through the closed connecting pipe 8 and the temperature-rising flow channel 11. Since the liquid bath heating wire 12 is powered on for heating, the liquid flowing through the temperature-rising flow channel 11 will gradually heat up.

[0042] As Figure 4 shown in the figure, since the above-mentioned electromagnet module 821 generates magnetic force after being powered on when the augmented reality display 4 is powered on, the electromagnet module 821 attracts the magnetic backplane 819 to move through magnetic force, so that the spring 820 is compressed. At this time, the extrusion switching shaft 817 moves towards the wave-shaped tooth 814, so that the extrusion switching shaft 817 is extrusion-fitted with the wave-shaped tooth 814. The wave-shaped tooth 814 rotates synchronously with the outer wall rotating sleeve 808. When the wave-shaped tooth 814 rotates, it extrudes and pushes the extrusion switching shaft 817, so that the extrusion switching shaft 817 drives the piston square shaft 816 to move axially. The piston square shaft 816 is elastically reset by the spring inside the piston air cylinder 815. At this time, the piston square shaft 816 shows axial reciprocating movement, so that the piston air cylinder 815 generates positive-pressure gas and inputs the positive-pressure air flow into the outer air cavity 901 through the air delivery pipe 822, as Figure 8As shown, the gas entering the outer air cavity 901 is heated by the gas heating wire 902 and ejected from the pointing air groove 903, directly spraying on the outer surface of the front protective lens 7, thereby improving the preheating rate of the front protective lens 7 in the initial stage of startup.

[0043] When wearing the extended reality display 4, wearing can be detected by the wearing detection sensor 6. At this time, the electromagnet module 821 and the gas heating wire 902 are powered off simultaneously. After the gas heating wire 902 is powered off, it stops heating, and after the electromagnet module 821 is powered off, it loses magnetism. As Figure 4 shown, the magnetic absorption back plate 819 moves axially under the reset elasticity of the spring 820, driving the extrusion switching shaft 817 to move axially, so that the extrusion switching shaft 817 is separated from the wave-shaped dial tooth 814. At this time, the piston square shaft 816 stops being driven, and the piston air cylinder 815 no longer generates positive pressure airflow, avoiding discomfort such as dry eyes caused by the airflow on the surface of the eyeball. During the wearing and use process, the temperature of the front protective lens 7 is maintained by heating with the liquid bath heating wire 12 and the liquid circulation inside the sandwich cavity 10, avoiding the generation of condensed water mist on the surface of the front protective lens 7.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A visual interaction system for young children based on a head-mounted device, comprising a display module (1), a signal processing module (2) and a signal acquisition module (3), characterized in that: The display module (1) uses the extended reality technology to present a stimulation paradigm for auxiliary diagnosis and a stimulation scene for auxiliary treatment, so as to induce a user's steady-state visual evoked potential. The signal acquisition module (3) collects the user's electroencephalogram information and sends it to the signal processing module (2). The signal processing module (2) uses an algorithm to process the received electroencephalogram signal, extracts characteristic information corresponding to visual function defects, and forms an objective and quantitative auxiliary examination result, which is fed back to the display module (1). The display module (1) then automatically sets the stimulation parameters according to the result. The display module (1) comprises an extended reality display (4), a headband (5), a wearing detection sensor (6) and a protective front mirror (7). The extended reality display (4) and the headband (5) are connected and fixed. The extended reality display (4) is embedded with a wearing detection sensor (6) for detecting whether the device is worn. The extended reality display (4) is provided with a protective front mirror (7) inside.

2. The visual interaction system for young children based on a head mounted device according to claim 1, characterized in that: The number of the protective front mirrors (7) is two groups in total, and a closed connecting tube (8) and a heating connection part (9) are connected between the two groups of the protective front mirrors (7). A sandwich surface cavity (10) is provided in the protective front mirror (7), and the two ends of the closed connecting tube (8) are respectively connected to the sandwich surface cavity (10). A heating flow channel (11) is provided in the heating connection part (9), and the two ends of the heating flow channel (11) are respectively connected to the sandwich surface cavity (10). A liquid bath electric heating wire (12) is provided in the heating flow channel (11).

3. The visual interaction system for young children based on a head mounted device according to claim 2, characterized in that: An axial end top frame (801) is fixedly arranged inside the closed connecting tube (8), a fixed top shaft (802) is fixedly arranged on the axial end top frame (801), a rotating main shaft (803) is arranged on the outside of the fixed top shaft (802) for limited rotation, and the rotating main shaft (803) is coaxially corresponding to the closed connecting tube (8).

4. The visual interaction system for young children based on a head mounted device according to claim 3, characterized in that: A driving blade (804) is fixedly provided on the surface of the rotating main shaft (803), a main shaft wing rod (805) is fixedly provided on the rotating main shaft (803), a wing rod end plate (806) is fixedly provided at the end of the main shaft wing rod (805), a driven magnet (807) is attached and fixed to the wing rod end plate (806), an outer sleeve of the closed connecting tube (8) is provided with an outer wall rotating sleeve (808), an inner surface of the outer wall rotating sleeve (808) is embedded with an attracting magnet (809), the attracting magnet (809) and the driven magnet (807) are magnetically matched, when the outer wall rotating sleeve (808) rotates, the rotating main shaft (803) can be driven to rotate through the magnetic match, a clamping ring (810) is fixedly provided on the surface of the closed connecting tube (8), and the clamping ring (810) axially limits the outer wall rotating sleeve (808).

5. The visual interaction system for young children based on a head mounted device according to claim 4, characterized in that: A worm gear ring (811) is fixedly arranged on the surface of the outer wall rotating sleeve (808), a worm portion (812) is meshedly arranged on the outside of the worm gear ring (811), a worm motor (813) for driving the worm portion (812) to rotate is arranged on one side of the worm portion (812), and the worm motor (813) is fixedly mounted on the housing of the augmented reality display (4).

6. The visual interaction system for young children based on a head mounted device according to claim 5, characterized in that: A wave-shaped shifting tooth (814) is fixedly arranged on the outer wall rotating sleeve (808), a piston cylinder (815) is fixedly arranged in the augmented reality display (4), a piston square shaft (816) is arranged in the piston cylinder (815), and when the piston square shaft (816) moves axially, the piston cylinder (815) generates a positive pressure airflow, an extrusion switching shaft (817) is inserted in the piston square shaft (816), and a limiting wall edge (818) is fixedly arranged on the surface of the extrusion switching shaft (817), and the limiting wall edge (818) cooperates with the piston square shaft (816) to limit the extrusion switching shaft (817), so that the extrusion switching shaft (817) can only move axially.

7. The visual interaction system for young children based on a head mounted device according to claim 6, characterized in that: When the extrusion switching shaft (817) extends in the direction of the wave shifting tooth (814), the extrusion switching shaft (817) can be extruded and matched with the wave shifting tooth (814). At this time, the wave shifting tooth (814) rotates, which squeezes and pushes the extrusion switching shaft (817), causing the piston square shaft (816) to move axially.

8. The visual interaction system for young children based on a head mounted device according to claim 7, characterized in that: A magnetic back plate (819) is fixedly provided at the end of the extrusion switching shaft (817), a spring (820) is provided between the magnetic back plate (819) and the piston square shaft (816), an electromagnet module (821) is fixedly provided on the piston square shaft (816), and the electromagnet module (821) can be magnetically matched with the magnetic back plate (819) after being energized.

9. The visual interaction system for young children based on a head mounted device according to claim 6, characterized in that: An air supply pipe (822) is provided at the air outlet of the piston cylinder (815), an outer air cavity (901) is provided in the heating connection portion (9), and the other end of the air supply pipe (822) is in communication with the outer air cavity (901).

10. The visual interaction system for young children based on a head mounted device according to claim 9, characterized in that: A gas heating wire (902) is arranged in the outer air cavity (901), and directional air grooves (903) are respectively provided on both sides of the outer air cavity (901), and the outer openings of the directional air grooves (903) face the center position of the surface of the protective front mirror (7).

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