Read-write table for realizing peripheral myopia type defocus

Abstract

The invention relates to a read-write table for realizing peripheral myopia type defocus, which comprises a totally-closed hollow rectangular shell, a spectroscope, a concave mirror, a retroreflection multi-structure combined mirror and an object distance matching light-transmitting panel, and is characterized in that the spectroscope is obliquely arranged in the middle of the shell, the concave mirror is embedded into the rear side wall of the shell, and the front side wall of the shell corresponding to the concave mirror is open; a retroreflection multi-structure combined mirror is embedded into the upper side wall of the shell, the retroreflection multi-structure combined mirror comprises a central hollow area I and a combined mirror area I, and the combined mirror area I comprises retroreflection lenses and concave lenses which are alternately arranged from inside to outside; an object distance matching light-transmitting panel is embedded into the lower side wall of the shell, the object distance matching light-transmitting panel comprises a second central hollow area and a second combined lens area, and the second combined lens area comprises convex lenses and plane lenses which are alternately arranged from inside to outside; according to the invention, the middle area of a picture seen by the human eyes through the read-write table is a virtual image, and virtual images and real images in the peripheral area are alternately distributed, so that the myopia prevention and control effect is realized, and the visual continuity and definition are ensured.

Description

Technical Field

[0001] The present invention relates to the field of optical system technology, and in particular to a reading and writing table that can achieve peripheral myopia type defocusing. Background Technology

[0002] Long-term close-up viewing and working is one of the important "culprits" of myopia. The reading and writing table, through the special optical path design, can image the desktop content in the air from a distance, transforming the close-up eyes into the long-distance eyes, realizing the transformation from "near vision" to "far vision", thereby reducing the burden of eye adjustment and achieving the purpose of myopia prevention and control.

[0003] Some reading and writing tables on the market do not have a defocusing function, and thus the myopia prevention and control effect is poor. Most reading and writing tables have their own light source, which illuminates the book downward, so that the book appears brighter. The image of the book after being imaged by the reading and writing table is projected farther, and the image of the book is darker when viewed by the human eye. Because the human eye is easily attracted by bright light, the eye will unconsciously look down at the physical book, but the reading and writing table requires viewing a darker virtual image of the book. In this way, the eyes will be affected by different lighting environments when viewing under bright and dark light, causing damage to the eyes.

[0004] Some reading and writing tables are defocused reading and writing tables. The defocused reading and writing table adopts a dual-light path imaging system design. The system structure includes a beam splitter, a concave mirror and a defocusing plate. The beam splitter is arranged at an angle, and a concave mirror is arranged behind the beam splitter and a defocusing plate is arranged above it, such as Figure 1 As shown. The core technologies of the defocused reading and writing table include telephoto technology, optical peripheral defocus and reduction of peripheral retinal contrast. Telephoto technology uses the optical design of free-form surface lenses to project the image of a book or screen into a virtual space of 3-8 meters, thereby simulating a distant view.

[0005] Optical peripheral defocus is achieved through the special design of the defocusing lens, which forms a dynamic defocus signal in the peripheral field of vision, inhibits the growth of the eye axis, and effectively delays the progression of myopia. Reducing the contrast of the peripheral retina is achieved through the combination of free-form lens and beam splitter, reducing the optical contrast of the peripheral field of vision, and preventing excessive stimulation of the eye axis by high-contrast environment.

[0006] Note: Due to the special design of the defocus film, there is a contrast between light and dark when imaging, that is, the image seen by the human eye has brighter areas and darker areas, which is visually discontinuous; and the main viewing center area is dark, which does not conform to the visual characteristics of the human eye (the human eye is more likely to focus on bright areas). SUMMARY OF THE INVENTION

[0007] In order to solve the problem that some reading and writing tables have poor myopia prevention and control effects and the light and dark contrast obviously affects the continuity of visual viewing, the present invention provides a reading and writing table that realizes peripheral myopia defocusing, optimizes the optical path design, and realizes that the middle area of ​​the picture seen by the human eye through the optimized reading and writing table is a virtual image, and the peripheral area is a virtual image and a real image alternately distributed, so that the continuity and clarity of vision can be guaranteed while achieving the effect of myopia prevention and control.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is: A reading and writing table for achieving peripheral myopia defocusing, comprising a fully enclosed hollow rectangular shell, a beam splitter, a concave mirror, a retroreflective multi-structure combined mirror and an object distance matching light-transmitting panel, wherein the beam splitter is arranged obliquely in the middle of the shell, the concave mirror is embedded in the rear side wall of the shell, and the front side wall of the shell corresponding to the concave mirror is open, so that people can use the reading and writing table conveniently; The beam splitter and the concave mirror are arranged at an angle of 45°, so that the light beam emitted from the middle area of ​​the observed object is reflected by the beam splitter and the concave mirror, and then passes through the beam splitter again and enters the human eye to form a virtual image; A retroreflective multi-structure combined mirror is embedded in the upper side wall of the shell, and the retroreflective multi-structure combined mirror includes a central hollow area 1 and a combined mirror area 1 arranged around the central hollow area 1, and the combined mirror area 1 includes a plurality of retroreflective lenses and a plurality of concave lenses arranged alternately from the inside to the outside, and both the retroreflective lenses and the concave lenses are in a square shape; The object distance matching light-transmitting panel is embedded in the lower side wall of the shell, and the object distance matching light-transmitting panel includes a central hollow area 2 and a combined mirror area 2 arranged around the central hollow area 2, and the combined mirror area 2 includes a plurality of convex lens sheets and a plurality of plane lens sheets arranged alternately from the inside to the outside, and the convex lens sheets and the plane lens sheets are also in a square shape; The object distance matching light-transmitting panel and the retro-reflective multi-structure combined mirror are arranged in parallel up and down, and are arranged at a 45° angle with the beam splitter, so that the light beam emitted from the peripheral area of ​​the observed object is transmitted by the object distance matching light-transmitting panel, the beam splitter, and the retro-reflective multi-structure combined mirror, and then reflected by the beam splitter again to enter the human eye, forming alternating real and virtual images.

[0009] Furthermore, the beam splitter is arranged at a 45° tilt, the concave mirror is arranged perpendicular to the retroreflective multi-structure combined mirror, and the size of the concave mirror is consistent with the size of the central hollow area 1 and the central hollow area 2, so as to facilitate the imaging content of the central imaging area to be exactly connected with the imaging content of the peripheral imaging area, so as to achieve a continuous imaging picture.

[0010] Furthermore, the two adjacent retroreflective lenses and concave lenses are tightly connected and fixed, and the curvature radius of the concave lens in the retroreflective multi-structure combined mirror is consistent with the curvature radius of the concave mirror, which improves the consistency of the depth of the imaging surfaces of the two in space and avoids the phenomenon of splitting and faulting of the imaging picture; The light beam formed by the retroreflective lens area enters the human eye and forms a real image, and the light beam formed by the concave lens area enters the human eye and forms a virtual image. The image distance of the virtual image formed by the retroreflective multi-structure combined mirror is the same as that formed by the concave mirror, which is conducive to the consistency of the imaging picture.

[0011] Furthermore, the size of the combined mirror area 1 is smaller than that of the combined mirror area 2, and the inner and outer margins of the combined mirror area 1 are expressed according to the following formula: Among them, is the inner and outer margins of a retroreflective lens, is the inner and outer margins of a concave lens, is the total number of retroreflective lenses, is the total number of circles of the concave lens, = or ±1.

[0012] Furthermore, the retroreflective lens and the convex lens piece correspond to each other up and down, and the corresponding retroreflective lens and the convex lens piece match in size; the plane lens piece and the concave lens piece correspond to each other up and down, and the corresponding plane lens piece and the concave lens piece match in size.

[0013] Furthermore, the focal adjustment amount of the object distance matching light-transmitting panel is expressed according to the following formula: Among them, is the focal length of the convex lens, The vertical distance from the light-transmitting panel to the desktop is matched to the object distance. is the vertical distance from the center of the beam splitter to the object distance matching light-transmitting panel, The horizontal distance from the human eye to the center of the spectroscope.

[0014] Furthermore, the retroreflective lens is made of glass beads or micro-prism structure.

[0015] Through the above technical solution, the beneficial effects of the present invention are: ​​​The present invention has a reasonable structural design, and realizes the telescopic technology of the reading and writing table by cooperating with the beam splitter and the concave mirror, which can meet the basic use of the reading and writing table. On this basis, a retroreflective multi-structure combined mirror with a special structure and an object distance matching light-transmitting panel are arranged in parallel above and below the beam splitter. The retroreflective multi-structure combined mirror includes alternating retroreflective lenses and concave lenses, and the object distance matching light-transmitting panel includes alternating convex lens sheets and flat lens sheets, so that the periphery of the observed object is defocused, and the imaging focus on the peripheral retina can be placed in front of the retina, forming myopic defocus, delaying the growth of the eye axis, thereby playing a role in preventing myopia or delaying the development of myopia.

[0016] The retroreflected light beam that reaches the retroreflective lens area of ​​the present invention is transmitted through a beam splitter and converged behind the human eye to form a real image; the reflected light beam that reaches the concave lens area is reflected again by a beam splitter and enters the human eye, and the reverse extension line of the light beam converges in front of the human eye to form a virtual image. Therefore, the middle area of ​​the picture seen by the human eye through the reading and writing table is a virtual image, and the virtual image and real image in the peripheral area are distributed alternately, which can not only ensure the continuity and clarity of vision, but also conform to the physiological characteristics of the human eye, that is, it has a certain peripheral visual range, which meets the structure and visual needs of the human eye, so it can well adapt to the visual function of the human eye at different angles, effectively improving the visual experience and correction efficiency. Brief Description of the Figures

[0017] Figure 1 This is a simplified diagram of the existing reading and writing station structure.

[0018] Figure 2 This is an axonometric diagram of a reading and writing table that realizes peripheral myopia defocusing according to the present invention. Point A in the diagram represents the magnified virtual image of the object being observed through the reading and writing table, and point B represents the projected real image of the object being observed through the reading and writing table.

[0019] Figure 3 This is a light path diagram of a reading and writing table that realizes peripheral myopia defocusing of the present invention. Point A in the figure represents the magnified virtual image of the observed object formed by the reading and writing table, B represents the lens of the human eye, C represents the retina of the human eye, and D represents the position where the real image is formed.

[0020] Figure 4 This is a schematic diagram of the arrangement of the optical components of a reading and writing table that realizes peripheral myopia defocusing of the present invention, in which B represents the lens.

[0021] Figure 5 This is a schematic diagram of a retroreflective multi-structure combined mirror and an object distance matching light-transmitting panel of a reading and writing table for realizing peripheral myopia type defocusing of the present invention.

[0022] Figure 6This is a light path diagram of a light beam passing through a retroreflective lens for a reading and writing table that realizes peripheral myopia defocusing of the present invention. Diagram a shows the light path of the light beam passing through a retroreflective lens with a glass bead structure, and diagram b shows the light path of the light beam passing through a retroreflective lens with a microprism structure. Point A in the figure shows the light spot formed after the light beam passes through the retroreflective lens.

[0023] The numbers in the attached figure are: 1 housing, 2 beam splitter, 3 concave mirror, 4 retroreflective multi-structure combined mirror, 41 central hollow area 1, 42 combined mirror area 1, 5 object distance matching light-transmitting panel, 51 central hollow area 2, 52 combined mirror area 2, 6 concave mirror imaging area range, 7 retroreflective lens, 8 concave lens, 9 retroreflective lens imaging area range, 10 convex lens, 11 flat lens, 12 human eye, 13 defocusing lens, 14 observed object. Specific implementation method

[0024] The following is a detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings: If Figure 2~Figure 6 As shown, a reading and writing table for achieving peripheral myopia defocusing includes a fully enclosed hollow rectangular shell 1, a beam splitter 2, a concave mirror 3, a retroreflective multi-structure combined mirror 4 and an object distance matching light-transmitting panel 5. The shell 1 has a certain structural strength and can carry the above multiple lenses and panels; a tripod is arranged under the shell 1, which can stably place the entire reading and writing table on the desktop, and at the same time, under the support of the tripod, the shell 1 is at a certain distance from the desktop.

[0025] A beam splitter 2 is arranged at a 45° angle in the middle of the shell 1. The beam splitter 2 is 340mm wide and 480mm high. The distance from the human eye 12 to the center of the beam splitter 2 is 220mm. A concave mirror 3 is embedded in the rear wall of the shell 1. The concave mirror 3 is small in size and only occupies a part of the rear wall of the shell 1. The concave mirror 3 runs through the rear wall of the shell 1. The beam splitter 2 and the concave mirror 3 are arranged at an angle of 45°, and the concave mirror 3 is arranged vertically and perpendicular to the desktop.

[0026] Here, the concave mirror 3 is 240mm long and 240mm wide, with a radius of curvature of 1300mm, and the desktop field of view formed on the desktop is 390mm long and 390mm wide, and the desktop field of view is also the concave mirror imaging area range 6. The concave mirror 3 faces the viewer, and the front side wall of the shell 1 corresponding to the concave mirror 3 is open, that is, the front side wall of the shell 1 is completely opened, and the beam splitter 2 is exposed, which is convenient for personnel to use the reading and writing table.

[0027] ​It is precisely because of the certain arrangement between the beam splitter 2 and the concave mirror 3 that the light beam emitted from the middle area of ​​the observed object 14 is reflected by the beam splitter 2 and the concave mirror 3, and then passes through the beam splitter 2 again and enters the human eye 12 to form a virtual image. The observed object 14 here can be a book or an electronic screen, and the light beam emitted by the observed object 14 refers to the light reflected by the natural ambient light acting on the book, or the light emitted by the internal light source of the electronic screen.

[0028] The upper side wall of the housing 1 is embedded with a retroreflective multi-structure combined mirror 4, which is arranged parallel to the tabletop, and the concave mirror 3 is arranged perpendicular to the retroreflective multi-structure combined mirror 4. The retroreflective multi-structure combined mirror 4 is a lens structure with a "U"-shaped cross section, so the middle of the retroreflective multi-structure combined mirror 4 is hollowed out. Specifically, the retroreflective multi-structure combined mirror 4 includes a central hollow area 41 and a combined mirror area 42 arranged around the central hollow area 41.

[0029] The size of the concave mirror 3 is the same as that of the central hollow area 41, so that the imaging content of the central imaging area can be exactly connected with the imaging content of the peripheral imaging area, realizing a continuous imaging picture and avoiding visual ghosting or dislocation. The combined mirror area 42 includes five retroreflective lenses 7 and five concave lenses 8 arranged alternately from the inside to the outside. The two adjacent retroreflective lenses 7 and concave lenses 8 inside and outside are tightly connected and fixed, and the retroreflective lenses 7 and concave lenses 8 are both in the shape of a square frame. The curvature radius of the concave lens 8 in the retroreflective multi-structure combined mirror 4 is consistent with the curvature radius of the concave mirror 3, which is also 1300mm, so that the image plane of the central imaging area and the image plane of the concave lens 8 imaging area in the surrounding retroreflective multi-structure combined mirror 4 maintain the same depth in space, avoiding the phenomenon of splitting and faulting of the imaging picture.

[0030] The retroreflective lens 7 is an optical element that can reflect incident light back to the direction of the light source along the original path. The retroreflective lens 7 is made of glass beads or microprisms. If the retroreflective lens 7 adopts a glass bead structure, then the retroreflective lens 7 is composed of densely arranged tiny glass beads. The glass bead structure uses the optical properties of a spherical lens to achieve retroreflection of light, that is, when light hits the surface of the glass bead, a process of refraction → reflection on the rear surface → refraction back occurs. The rear surface of the glass bead is coated with a reflective film, thereby achieving light reflection.

[0031] If the retroreflective lens 7 adopts a microprism structure, then the retroreflective lens 7 is composed of densely arranged tiny triangular pyramids. Retroreflection is achieved by total internal reflection of the microprism structure, that is, after the light enters the microprism, it undergoes multiple total internal reflections on three right-angled surfaces and finally returns along the incident direction.

[0032] Because the retroreflective lens 7 uses a glass bead or microprism structure, there is a certain deviation between the incident angle of the light and the exit angle after passing through the retroreflective lens 7, and the deviation angle ranges from 2° to 5°. Then, the light beam emitted by the observed object 14 passes through the beam splitter 2 and the retroreflective lens 7 and converges into a light spot in the air behind the human eye 12, thereby reducing the contrast of the content seen by the human eye 12 through the retroreflective lens 7 and enhancing the myopia prevention and control effect.

[0033] The inner and outer margins of the combined mirror area 42 are expressed according to the following formula: Among them, is the inner and outer margins of a retroreflective lens 7, is the inner and outer margins of a concave lens 8, is the total number of circles of the retroreflective lens 7, is the total number of circles of the concave lens 8, = or ±1. Here, the inner and outer margins of the retroreflective lens 7 are 5mm, and the inner and outer margins of the concave lens 8 are also 5mm. According to the above formula, the inner and outer margins of the combined mirror area 42 are 50mm, and the inner and outer margins of the desktop field of view formed by the combined mirror area 42 are 55.8mm, which is also the imaging area range 9 of the retroreflective lens.

[0034] The light beam formed by the retroreflective lens 7 enters the human eye 12 to form a real image, and the light beam formed by the concave lens 8 enters the human eye 12 to form a virtual image. The virtual image formed by the retroreflective multi-structure combined mirror 4 has the same image distance as the virtual image formed by the concave mirror 3, so that the overall imaging is consistent and the image is prevented from having a sense of discontinuity.

[0035] The lower side wall of the housing 1 is embedded with an object distance matching light-transmitting panel 5, which passes through the lower side wall of the housing 1. The object distance matching light-transmitting panel 5 is arranged parallel to the desktop, and is closer to the desktop than the retro-reflective multi-structure combined mirror 4 and the object distance matching light-transmitting panel 5. The object distance matching light-transmitting panel 5 is also a lens structure with a "U"-shaped cross section, and the size of the object distance matching light-transmitting panel 5 is larger than that of the retro-reflective multi-structure combined mirror 4.

[0036] The object distance matching light-transmitting panel 5 includes a central hollow area 2 51 and a combined mirror area 2 52 arranged around the central hollow area 2 51. The size of the central hollow area 1 41 is consistent with that of the central hollow area 2 51, and the size of the combined mirror area 1 42 is smaller than that of the combined mirror area 2 52. The combined mirror area 2 52 includes five convex lens sheets 10 and five plane lens sheets 11 arranged alternately from the inside to the outside. The two adjacent convex lens sheets 10 and the plane lens sheets 11 inside and outside are tightly connected and fixed, and the convex lens sheets 10 and the plane lens sheets 11 are also in the shape of a square frame.

[0037] Here, the convex lens sheet 10 is composed of a plurality of square convex lenses, which are connected and combined to form a "U" shape. The plane lens sheet 11 is also composed of a plurality of square plane lenses, which are connected and combined to form a "U" shape.

[0038] The retroreflective lens 7 and the convex lens 10 correspond to each other up and down, and the corresponding retroreflective lens 7 and the convex lens 10 match in size; the light beam passing through the convex lens 10 just reaches the retroreflective lens 7, increasing the object distance and achieving a farther imaging distance, so that the image is formed behind the human eye 12, forming a myopic defocusing of the peripheral area of ​​the retina. The plane lens 11 corresponds to the concave lens 8 up and down, and the corresponding plane lens 11 matches in size with the concave lens 8, and the light beam does not change the emission direction after passing through the plane lens 11.

[0039] The size matching mentioned above does not mean the same size. Specifically, the inner and outer margins of the plane lens sheet 11 are 5mm, which is also the side length of the square plane lens; the inner and outer margins of the convex lens sheet 10 are 7.8mm, which is also the side length of the square convex lens, and the focal length of the convex lens sheet 10 is 432mm. Since the light path will be narrowed after passing through the convex lens sheet 10, in order to adapt to the size of the retroreflective lens 7, only when the inner and outer margins of the convex lens sheet 10 are 7.8mm, the light path passing through the convex lens sheet 10 will accurately reach the retroreflective lens 7.

[0040] The focal adjustment amount of the object distance matching light-transmitting panel 5 is expressed by the following formula: Among them, is a convex lens with a focal length of 10, The vertical distance from the light-transmitting panel 5 to the desktop is matched to the object distance, is the vertical distance from the center of the beam splitter 2 to the object distance matching the light-transmitting panel 5, The horizontal distance from the human eye 12 to the center of the beam splitter 2. Here is 432mm, is 330mm, is 170mm, is 220mm, so the focal adjustment can be calculated is 1007.65mm, that is, the light beam emitted by the observed object 14 converges at a position 1007.65mm behind the human eye 12 through the object distance matching light-transmitting panel 5 and the retroreflective lens 7. After being refracted by the eyeball refractive system, the light beam is focused in front of the peripheral area of ​​the retina, forming a myopic defocus, thereby slowing down the growth rate of the eye axis and achieving myopia prevention and control. Within a certain range, the optical power adjustment amount The larger the value, the better the myopia prevention and control effect of the reading and writing table. Therefore, the optical focal adjustment amount can be changed by changing the height of the reading and writing table or changing the viewing distance of the human eye. , to achieve better myopia prevention and control effects.

[0041] The object distance matching light-transmitting panel 5 and the retroreflective multi-structure combined mirror 4 are arranged in parallel up and down, and are arranged at a 45° angle with the beam splitter 2. It is precisely because of the certain arrangement between the beam splitter 2, the retroreflective multi-structure combined mirror 4 and the object distance matching light-transmitting panel 5 that the light beam emitted from the peripheral area of ​​the observed object 14 is transmitted by the object distance matching light-transmitting panel 5, the beam splitter 2, and the retroreflective lens 7 and concave lens 8 in the retroreflective multi-structure combined mirror 4, and then reflected by the beam splitter 2 again and enters the human eye 12, forming alternating real images and virtual images.

[0042] The principle of the present invention is: the observed object 14 is placed on the table within the concave mirror imaging area 6, the light beam emitted from the middle area of ​​the observed object 14 is reflected by the beam splitter 2 to reach the concave mirror 3, and then reflected by the concave mirror 3 and transmitted through the beam splitter 2 to enter the human eye 12, and the reverse extension line of the light beam converges in front of the human eye 12 to form a virtual image. At the same time, the light beam emitted from the peripheral area of ​​the observed object 14 reaches the beam splitter 2 through the object distance matching light-transmitting panel 5, and then transmitted to the retro-reflective multi-structure combined mirror 4 through the beam splitter 2: the retro-reflected light beam reaching the retro-reflective lens 7 area is transmitted through the beam splitter 2 and converges behind the human eye 12 to form a real image; the reflected light beam reaching the concave lens 8 area is reflected again through the beam splitter 2 to enter the human eye 12, and the reverse extension line of the light beam converges in front of the human eye 12 to form a virtual image. That is, the middle area of ​​the picture seen by the human eye 12 through the reading and writing table is a virtual image, and the virtual image and the real image in the peripheral area are alternately distributed. In this way, while achieving the effect of myopia prevention and control, the continuity and clarity of vision can also be guaranteed.

[0043] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.​

Claims

1. A reading and writing table for achieving peripheral myopia type defocus, characterized in that: It comprises a fully enclosed hollow rectangular shell (1), a beam splitter (2), a concave mirror (3), a retroreflective multi-structure combined mirror (4) and an object distance matching light-transmitting panel (5), wherein the beam splitter (2) is arranged obliquely in the middle of the shell (1), the concave mirror (3) is embedded in the rear side wall of the shell (1), and the front side wall of the shell (1) corresponding to the concave mirror (3) is open; The beam splitter (2) and the concave mirror (3) are arranged at an angle of 45°, so that the light beam emitted from the middle area of ​​the observed object (14) is reflected by the beam splitter (2) and the concave mirror (3), then passes through the beam splitter (2) again and enters the human eye (12), forming a virtual image; A retroreflective multi-structure combined mirror (4) is embedded in the upper side wall of the shell (1); the retroreflective multi-structure combined mirror (4) comprises a central hollow area (41) and a combined mirror area (42) arranged around the central hollow area (41); the combined mirror area (42) comprises a plurality of retroreflective lenses (7) and a plurality of concave lenses (8) arranged alternately from the inside to the outside; the retroreflective lenses (7) and the concave lenses (8) are both in the shape of a square frame; The object distance matching light-transmitting panel (5) is embedded in the lower side wall of the housing (1); the object distance matching light-transmitting panel (5) comprises a second central hollow area (51) and a second combined mirror area (52) arranged around the second central hollow area (51); the second combined mirror area (52) comprises a plurality of convex lens sheets (10) and a plurality of planar lens sheets (11) arranged alternately from the inside to the outside; the convex lens sheets (10) and the planar lens sheets (11) are also in a square frame shape; The object distance matching light-transmitting panel (5) and the retroreflective multi-structure combined mirror (4) are arranged in parallel up and down, and are arranged at an angle of 45° with the beam splitter (2), so that a light beam emitted from the peripheral area of ​​the observed object (14) is transmitted through the object distance matching light-transmitting panel (5), transmitted through the beam splitter (2), and reflected by the retroreflective multi-structure combined mirror (4), and then reflected again by the beam splitter (2) before entering the human eye (12), thereby forming alternatingly distributed real images and virtual images.

2. A reading and writing table for achieving peripheral myopia defocusing according to claim 1, characterized in that: The beam splitter (2) is arranged at an angle of 45 degrees, the concave mirror (3) is arranged perpendicular to the retro-reflective multi-structure combined mirror (4), and the size of the concave mirror (3) is consistent with the size of the central hollow area 1 (41) and the central hollow area 2 (51).

3. A reading and writing table for achieving peripheral myopia defocusing according to claim 1, characterized in that: Two adjacent retroreflective lenses (7) and concave lenses (8) are tightly connected and fixed, and the curvature radius of the concave lenses (8) in the retroreflective multi-structure combined mirror (4) is consistent with the curvature radius of the concave mirror (3); The light beam formed by the retroreflective lens (7) enters the human eye (12) to form a real image, and the light beam formed by the concave lens (8) enters the human eye (12) to form a virtual image. The image distance of the virtual image formed by the retroreflective multi-structure combined mirror (4) is the same as the image distance of the virtual image formed by the concave mirror (3).

4. A reading and writing table for achieving peripheral myopia defocusing according to claim 1, characterized in that: The size of the combined mirror area 1 (42) is smaller than the size of the combined mirror area 2 (52), and the inner and outer margins of the combined mirror area 1 (42) are expressed according to the following formula: ； in, is the inner and outer margins of a retroreflective lens (7), is the inner and outer margins of a concave lens (8), is the total number of turns of the retroreflective lens (7), is the total number of circles of the concave lens (8), = or ±1.

5. A reading and writing table for achieving peripheral myopia defocusing according to claim 4, characterized in that: The retroreflective lens (7) and the convex lens (10) correspond to each other in upper and lower parts, and the corresponding retroreflective lens (7) and the convex lens (10) have matching sizes; the plane lens (11) and the concave lens (8) correspond to each other in upper and lower parts, and the corresponding plane lens (11) and the concave lens (8) have matching sizes.

6. The reading and writing table for achieving peripheral myopia defocusing according to claim 1, characterized in that: The focal length adjustment amount of the object distance matching light-transmitting panel (5) is expressed by the following formula: ； in, is the focal length of the convex lens (10), The vertical distance between the light-transmitting panel (5) and the desktop is matched to the object distance. is the vertical distance from the center of the beam splitter (2) to the object distance matching light-transmitting panel (5), It is the horizontal distance from the human eye (12) to the center of the beam splitter (2).

7. The reading and writing table for achieving peripheral myopia defocusing according to claim 1, characterized in that: The retroreflective lens (7) is made of glass beads or a micro-prism structure.

Images