A reading and writing table for achieving peripheral myopia type defocusing

Abstract

The invention relates to a reading and writing table for realizing peripheral myopia type 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; the retroreflective multi-structure combined mirror is embedded in the upper side wall of the shell, the retroreflective multi-structure combined mirror comprises a central hollow area 1 and a combined mirror area 1, and the combined mirror area 1 comprises retroreflective lenses and concave lenses arranged alternately from the inside to the outside; the object distance matching light-transmitting panel is embedded in the lower side wall of the shell, the object distance matching light-transmitting panel comprises a central hollow area 2 and a combined mirror area 2, and the combined mirror area 2 comprises convex lens sheets and plane lens sheets arranged alternately from the inside to the outside; the middle area of ​​the picture seen by human eyes through the reading and writing table is a virtual image, and virtual images and real images in the peripheral area are alternately distributed, so that the continuity and clarity of vision are guaranteed while achieving the myopia prevention and control effect.

Description

Technical Field

[0001] The invention relates to the technical field of optical systems, and in particular to a reading and writing table for achieving peripheral myopia type defocusing. Background Art

[0002] Prolonged close-up viewing and working is one of the important "culprits" in the formation of myopia. The reading and writing desk, through its special optical path design, can image the desktop contents in the air from a distance, converting close-range eye use into long-range eye use, achieving the transition 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, a concave mirror is arranged behind the beam splitter, and a defocusing plate is arranged above it. Figure 1 The core technologies of the defocused reading and writing table include telephoto technology, optical peripheral defocus and reduction of peripheral retinal contrast. The 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 lenses and beam splitters, reducing the optical contrast of the peripheral field of vision, and preventing excessive stimulation of the eye axis by high-contrast environments.

[0006] It should be noted that 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 desks have poor myopia prevention and control effects and light and dark contrast obviously affects the continuity of visual viewing, the present invention provides a reading and writing desk that can achieve peripheral myopia defocusing, optimizes the optical path design, and achieves that the middle area of ​​the picture seen by the human eye through the optimized reading and writing desk is a virtual image, and the peripheral area is a virtual image and a real image are alternately distributed, so that the continuity and clarity of vision can be guaranteed while achieving the myopia prevention and control effect.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A reading and writing table for achieving peripheral myopia type 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;

[0010] 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;

[0011] A retroreflective multi-structure combined mirror is embedded in the upper side wall of the shell, the retroreflective multi-structure combined mirror comprises a central hollow area 1 and a combined mirror area 1 arranged around the central hollow area 1, the combined mirror area 1 comprises 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;

[0012] The object distance matching light-transmitting panel is embedded in the lower side wall of the housing, and the object distance matching light-transmitting panel includes a second central hollow area and a second combined mirror area arranged around the second central hollow area, and the second combined mirror area 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 frame shape;

[0013] The object distance matching light-transmitting panel and the retro-reflective multi-structure combination mirror are arranged in parallel up and down, and are arranged at an angle of 45° 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 combination mirror, and then reflected by the beam splitter again to enter the human eye, forming alternating real images and virtual images.

[0014] Furthermore, the beam splitter is arranged at an angle of 45°, the concave mirror is arranged perpendicular to the retroreflective multi-structure combination mirror, and the size of the concave mirror is consistent with the size of the central hollow area one and the central hollow area two, 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, thereby realizing a continuous imaging picture.

[0015] Furthermore, the two adjacent retroreflective lenses and the concave lens 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 planes of the two in space and avoids the phenomenon of splitting and faulting of the imaging picture;

[0016] The light beam formed through the retroreflective lens area enters the human eye and forms a real image, and the light beam formed through 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 combination mirror is the same as that formed by the concave mirror, which is beneficial to the consistency of the imaging picture.

[0017] Furthermore, the size of the combined mirror area 1 is smaller than the size 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:

[0018]

[0019] in, 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.

[0020] 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.

[0021] Furthermore, the object distance is matched with the focal power adjustment amount of the light-transmitting panel according to the following formula:

[0022]

[0023] in, is the focal length of the convex lens, To match the object distance, the vertical distance from the light-transmitting panel to the desktop is The vertical distance from the center of the beam splitter to the object distance matching light-transmitting panel, It is the horizontal distance from the human eye to the center of the beam splitter.

[0024] Furthermore, the retroreflective lens is made of glass beads or micro-prism structure.

[0025] Through the above technical solution, the beneficial effects of the present invention are:

[0026] The invention has a reasonable structural design, and realizes the telescopic technology of the reading and writing table by cooperating with a beam splitter and a 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, and 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 plane 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.

[0027] The retroreflected light beam reaching 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 reaching 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 the real image in the peripheral area are alternately distributed, 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, meets the structure and visual needs of the human eye, and 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 DRAWINGS

[0028] Figure 1 This is a simplified diagram of the existing reading and writing desk structure.

[0029] Figure 2 It is an axonometric diagram of a reading and writing table for realizing peripheral myopia type defocusing of the present invention. Point A in the diagram represents an enlarged virtual image formed by an observed object passing through the reading and writing table, and point B represents a projected real image formed by the observed object passing through the reading and writing table.

[0030] Figure 3 The present invention is a light path diagram of a reading and writing table for realizing peripheral myopia type defocusing. Point A in the diagram represents a magnified virtual image of an observed object formed through the reading and writing table, B represents the lens of a human eye, C represents the retina of a human eye, and D represents the position where a real image is formed.

[0031] Figure 4 The present invention is a schematic diagram of the arrangement of various optical components of a reading and writing table for achieving peripheral myopia defocusing, wherein B represents the lens.

[0032] Figure 5 The present invention 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.

[0033] Figure 6This is a light path diagram of a light beam of a reading and writing table that realizes peripheral myopia type defocusing when passing through a retroreflective lens of the present invention. Diagram a shows the light path of the light beam when passing through a retroreflective lens with a glass bead structure, and diagram b shows the light path of the light beam when 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.

[0034] The numbers in the accompanying drawings are: 1 shell, 2 beam splitter, 3 concave mirror, 4 retroreflective multi-structure combination mirror, 41 central hollow area one, 42 combination mirror area one, 5 object distance matching light-transmitting panel, 51 central hollow area two, 52 combination mirror area two, 6 concave mirror imaging area range, 7 retroreflective lens, 8 concave lens, 9 retroreflective lens imaging area range, 10 convex lens sheet, 11 plane lens sheet, 12 human eye, 13 defocus sheet, 14 observed object. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0036] like Figure 2~Figure 6 As shown, a reading and writing table for achieving peripheral myopia type 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, and the entire reading and writing table can be stably placed on the desktop. At the same time, under the support of the tripod, the shell 1 is at a certain distance from the desktop.

[0037] A beam splitter 2 is arranged at an angle of 45° in the middle of the housing 1. The beam splitter 2 is 340 mm wide and 480 mm high. The distance from the human eye 12 to the center of the beam splitter 2 is 220 mm. A concave mirror 3 is embedded in the rear wall of the housing 1. The concave mirror 3 is small in size and occupies only a part of the rear wall of the housing 1. The concave mirror 3 runs through the rear wall of the housing 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.

[0038] Here, the concave mirror 3 is 240 mm long and 240 mm wide, and the radius of curvature is 1300 mm, so that the desktop field of view formed on the desktop is 390 mm long and 390 mm 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 housing 1 corresponding to the concave mirror 3 is open, that is, the front side wall of the housing 1 is completely opened, and then the beam splitter 2 is exposed, so that the personnel can use the reading and writing table conveniently.

[0039] 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.

[0040] A retroreflective multi-structure combined mirror 4 is embedded in the upper side wall of the housing 1. The retroreflective multi-structure combined mirror 4 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.

[0041] 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 just 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, and 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.

[0042] 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.

[0043] If the retroreflective lens 7 adopts a microprism structure, 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 entering the microprism, the light undergoes multiple total internal reflections on three right-angled surfaces and finally returns along the incident direction.

[0044] Because the retroreflective lens 7 adopts 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.

[0045] The inner and outer margins of the combined mirror area 42 are expressed according to the following formula:

[0046]

[0047] 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. Here, the inner and outer margins of the retroreflective lens 7 are 5 mm, and the inner and outer margins of the concave lens 8 are also 5 mm. According to the above formula, the inner and outer margins of the combined mirror area 42 are 50 mm, and the inner and outer margins of the desktop field of view formed by the combined mirror area 42 are 55.8 mm, which is also the imaging area range 9 of the retroreflective lens.

[0048] The light beam formed by the retroreflective mirror 7 enters the human eye 12 to form a real image, and the light beam formed by the concave mirror 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 screen is prevented from having a sense of discontinuity.

[0049] 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. 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.

[0050] 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.

[0051] 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.

[0052] 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 beams passing through the convex lens 10 just reach 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 defocus 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 exit direction after passing through the plane lens 11.

[0053] 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.

[0054] The focal adjustment amount of the object distance matching light-transmitting panel 5 is expressed by the following formula:

[0055]

[0056] in, The focal length of the convex lens is 10. To match the object distance, the vertical distance from the light-transmitting panel 5 to the desktop is The vertical distance from the center of the beam splitter 2 to the object distance matches the light-transmitting panel 5, is the horizontal distance from the human eye 12 to the center of the beam splitter 2. 432mm, 330mm, 170mm, is 220mm, so the focal adjustment can be calculated The distance between the light beam and the retina is 1007.65 mm, that is, the light beam emitted by the observed object 14 converges at a position 1007.65 mm behind the human eye 12 through the object distance matching light-transmitting panel 5 and the retroreflective lens 7. The light beam is refracted by the eyeball refractive system and 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 focal 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.

[0057] The object distance matching light-transmitting panel 5 and the retroreflective multi-structure combination mirror 4 are arranged in parallel up and down, and are arranged at an angle of 45° to the beam splitter 2. It is precisely because the beam splitter 2, the retroreflective multi-structure combination mirror 4 and the object distance matching light-transmitting panel 5 are arranged in a certain form that the light beam emitted from the peripheral area of ​​the observed object 14 is transmitted through the object distance matching light-transmitting panel 5, the beam splitter 2, and the retroreflective lens 7 and the concave lens 8 in the retroreflective multi-structure combination mirror 4, and then reflected again by the beam splitter 2 into the human eye 12, forming alternating real images and virtual images.

[0058] The principle of the present invention is as follows: the observed object 14 is placed on the table within the concave mirror imaging area range 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.

[0059] 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