Peripheral visual area out-of-focus imaging system with variable out-of-focus amount

Abstract

The invention discloses a peripheral visual area out-of-focus imaging system with variable out-of-focus amount. The peripheral visual area out-of-focus imaging system is composed of a zoom reflector and a spectroscope. The zoom reflector is located right above an observed object, and the side, provided with the microstructure array, of the zoom reflector faces the observed object; the spectroscope is positioned between the zoom reflector and an observed object, and is inclined at a certain angle relative to the vertical direction; the surface, provided with the microstructure array, of the zoom reflector comprises two regions, namely a central region S1 and a peripheral edge region S2, the S1 region is composed of a concentric ring microstructure array with the equivalent focal length F1, the S2 region is composed of concentric ring microstructures with the equivalent focal lengths F1 and Fv which are alternately arranged, the centers of concentric rings of the S1 region and the S2 region coincide, and the center of the concentric ring microstructures of the S1 region and the center of the concentric ring microstructures of the Fv region coincide with the center of the concentric ring microstructures of the S2 region. And the microstructure is an edge tooth structure in circular ring distribution. The micro-structure array is adopted, the defocusing amount can be freely controlled through the structure parameters of the micro-structure array capable of being flexibly regulated and controlled, a defocusing image with the variable defocusing amount and uniform brightness is achieved, and therefore the good myopia prevention and control effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of optical technology, and in particular to a peripheral visual area defocus imaging system with variable defocus amount. Background Art

[0002] Due to the changes in modern lifestyle, the widespread use of electronic products, increased study pressure, and reduced outdoor activity time, the incidence of myopia among children and adolescents has increased year by year, and is showing a trend of younger age and higher myopia. The number of myopic people in the world is growing rapidly, and the number of myopic students in China ranks first in the world. Myopia prevention and control has become a focus of social attention. As an innovative myopia prevention and control product, the defocused reading and writing table has broad market prospects and a large potential customer base.

[0003] However, the existing reading and writing table with defocusing function realizes the telephoto and defocusing functions at the same time through the hyperbolic mirror. The curved mirror is large in size and weight, and the image brightness of the defocused area is inconsistent. In addition, the degree of freedom of the curved mirror is limited, and it is difficult to freely adjust the defocusing amount. Therefore, this type of defocusing reading and writing table is large in size, highly complex, and the brightness of the defocused image is uneven, which makes it difficult to ensure a good myopia prevention and control effect. Summary of the invention

[0004] In view of the above problems, the present invention proposes a peripheral visual area defocus imaging system with variable defocus, which adopts a microstructure array to realize the telephoto function and defocus function of the reading and writing table, reducing the system volume and system complexity, and the flexibly adjustable structural parameters of the microstructure array can freely control the defocus, realizing a defocus image with variable defocus and uniform brightness, thereby achieving a good myopia prevention and control effect.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A peripheral visual area defocus imaging system with variable defocus amount, the system consists of a zoom reflector and a beam splitter; the zoom reflector is located directly above an observed object, one surface of the zoom reflector is a plane, and a microstructure array is arranged on the other surface, and the surface provided with the microstructure array faces the observed object; the beam splitter is located between the zoom reflector and the observed object, and is placed at a certain angle to the vertical direction; A side of the zoom reflector provided with a microstructure array includes two areas, a central area S1 and a peripheral edge area S2, the S1 area is composed of a concentric ring microstructure array with an equivalent focal length of F1, the S2 area is composed of alternating concentric ring microstructures with equivalent focal lengths of F1 and Fv, Fv is a fixed value or changes with the distance from the concentric ring microstructure to the center of the ring, the centers of the concentric ring microstructures in the S1 area and the S2 area coincide, and the microstructure is a serrated structure distributed in a ring; The light emitted by the observed object passes through the beam splitter to the side of the zoom reflector equipped with a microstructure array, and then reaches the beam splitter after being reflected by the concentric circular microstructure array with an equivalent focal length of F1 on the zoom reflector, and is then reflected into the human eye, and finally forms an enlarged virtual image at a certain distance in front of the human eye; the light reaching the concentric circular microstructure array with an equivalent focal length of Fv on the zoom reflector is reflected to the beam splitter, and then is reflected into the human eye, and finally forms a defocused image with a certain defocus amount in front of the peripheral retina of the human eye.

[0006] Furthermore, the distance d3 between the enlarged virtual image formed in front of the human eye by the imaging system and the human eye satisfies the following relationship: Among them, d0 represents the distance from the observed object to the zoom reflector; d1 represents the distance from the zoom reflector to the beam splitter; d2 represents the distance from the beam splitter to the human eye; F1 represents the equivalent focal length of the microstructure array in the S1 area and part of the microstructure array in the S2 area.

[0007] Furthermore, the defocus amount D of the defocused image formed in front of the peripheral retina of the human eye by the imaging system satisfies the following relationship: Among them, d0 represents the distance from the observed object to the zoom reflector; d1 represents the distance from the zoom reflector to the beam splitter; d2 represents the distance from the beam splitter to the human eye; and Fv represents the equivalent focal length of part of the microstructure array in the S2 region.

[0008] Furthermore, the bottom angle α of the ridged tooth structure satisfies the following relationship: Among them, d1 represents the distance from the center of the zoom reflector to the center of the beam splitter; d2 represents the distance from the center of the beam splitter to the center of the viewing plane; s represents the distance from the incident point of the light on the zoom reflector to the center of the zoom reflector; l represents the distance from the viewing position to the center of the viewing plane.

[0009] Furthermore, when the concentric circular microstructures in the S2 region are arranged, one circular microstructure is arranged alternately as a group.

[0010] Furthermore, when the concentric ring microstructures in the S2 region are arranged, one microstructure is arranged as a group and alternately.

[0011] Furthermore, when the concentric ring microstructures in the S2 region are arranged, a plurality of microstructures are arranged alternately as a group.

[0012] Furthermore, when a plurality of microstructures are arranged alternately as a group, the number of microstructures in each group is the same.

[0013] Furthermore, when a plurality of microstructures are arranged alternately as a group, the number of microstructures in each group is different.

[0014] Furthermore, microstructures in the same group use the same or different equivalent focal lengths, and microstructures in two adjacent groups use different equivalent focal lengths.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a microstructure array to realize the telephoto function and the defocusing function, reduces the system volume and system complexity, and the flexibly adjustable structural parameters of the microstructure array can freely control the defocus amount, realize a defocused image with variable defocus amount and uniform brightness, thereby achieving a good myopia prevention and control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a peripheral visual area defocus imaging system with variable defocus amount according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of a zoom reflector according to an embodiment of the present invention provided with a microstructure array on one side; Figure 3 This is one of the schematic diagrams of parameter settings of a peripheral visual area defocus imaging system with variable defocus amount according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of a zoom reflector according to an embodiment of the present invention; Figure 5 This is a second schematic diagram of parameter settings of a peripheral visual area defocus imaging system with variable defocus amount according to an embodiment of the present invention; Figure 6 Schematic diagram of the structure of a spectroscope according to an embodiment of the present invention; Figure 7 The second structural schematic diagram of a zoom reflector according to an embodiment of the present invention provided with a microstructure array on one side; Figure 8 The third structural schematic diagram of a zoom reflector provided with a microstructure array on one side according to an embodiment of the present invention; Fig. 9 The fourth structural diagram of a zoom reflector according to an embodiment of the present invention is provided with a microstructure array. DETAILED DESCRIPTION

[0017] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments: Embodiment 1 like Figure 1As shown, a peripheral visual area defocus imaging system with variable defocus amount is composed of a zoom reflector (A1) and a beam splitter (A2). The zoom reflector (A1) is located directly above the observed object, and a microstructure array is provided on one surface of the zoom reflector, and the surface provided with the microstructure array faces the observed object. The beam splitter (A2) is located between the zoom reflector (A1) and the observed object, and is placed at a certain angle to the vertical direction.

[0018] One surface of the zoom reflector (A1) is a plane, and the other surface is provided with a microstructure array. Figure 2 As shown, one side of the zoom reflector (A1) provided with a microstructure array includes two regions, a central region S1 and a peripheral edge region S2. The S1 region is composed of a concentric ring microstructure array with an equivalent focal length of F1, and the S2 region is composed of alternating concentric ring microstructures with an equivalent focal length of F1 and Fv (Fv can be a fixed value or a variable value, for example, Fv can change with the different distances from the concentric ring microstructure to the center of the ring, etc.), the centers of the concentric ring microstructures in the S1 region and the S2 region coincide, and the microstructure is a serrated structure distributed in a ring.

[0019] The function of the zoom reflector (A1) is to form a magnified image of the observed object by the microstructure array with an equivalent focal length of F1 and to form a defocused image with a certain defocus amount by the microstructure array with an equivalent focal length of Fv. The function of the beam splitter (A2) is to project the magnified image of the observed object to a certain distance in front of the human eye and to project the defocused image in front of the retina of the human eye.

[0020] The imaging principle of the system is that the light emitted by the observed object first passes through the beam splitter (A2) to the surface of the zoom reflector (A1) with a microstructure array, and then reaches the beam splitter (A2) after being reflected by the concentric ring microstructure array with an equivalent focal length of F1 on the zoom reflector (A1), and then is reflected into the human eye, and finally forms an enlarged virtual image at a certain distance in front of the human eye; the light reaching the concentric ring microstructure array with an equivalent focal length of Fv on the zoom reflector (A1) will be reflected to the beam splitter (A2), and then is reflected into the human eye, and finally forms a defocused image with a certain defocus amount in front of the peripheral retina of the human eye. Ultimately, the human eye can see the enlarged virtual image of the observed object that is clear in the middle visual area at a distance and blurred in the peripheral visual area, achieving the display effect of defocusing the peripheral visual area, thereby achieving the purpose of myopia prevention and control.

[0021] like Figure 3 As shown, the distance d3 from the enlarged virtual image formed in front of the human eye by the imaging system satisfies the relationship Among them, d0 represents the distance from the observed object to the zoom reflector (A1); d1 represents the distance from the zoom reflector (A1) to the beam splitter (A2); d2 represents the distance from the beam splitter (A2) to the human eye; F1 represents the equivalent focal length of the microstructure array in the S1 area and part of the microstructure array in the S2 area.

[0022] The defocus amount D of the defocused image formed in front of the peripheral retina of the human eye by the imaging system satisfies the relationship Wherein, d0 represents the distance from the observed object to the zoom reflector (A1); d1 represents the distance from the zoom reflector (A1) to the beam splitter (A2); d2 represents the distance from the beam splitter (A2) to the human eye; and Fv represents the equivalent focal length of part of the microstructure array in the S2 region.

[0023] The components of the peripheral visual area defocus imaging system with variable defocus amount will be described in detail below.

[0024] like Figure 4 As shown, the zoom reflector (A1) is located directly above the observed object. One surface of the zoom reflector (A1) is a plane, and a microstructure array is arranged on the other surface. The surface with the microstructure array includes two areas, a central area S1 area, and a peripheral edge area S2 area. Area S1 is composed of a concentric circular microstructure array with an equivalent focal length of F1, and area S2 is composed of alternating concentric circular microstructures with equivalent focal lengths of F1 and Fv (Fv can be a fixed value or a variable value, for example, Fv can change with the distance from the circular microstructure to the center of the surface, etc.), and the centers of the concentric circular rings of area S1 and area S2 coincide. The function of the zoom reflector (A1) is to form a magnified image of the observed object by the microstructure array with an equivalent focal length of F1 and to form a defocused image with a certain defocus amount by the microstructure array with an equivalent focal length of Fv.

[0025] In the S2 region, Fv can be a fixed value or a variable value. For example, Fv can change with the distance from the annular microstructure to the center of the surface. The arrangement of the microstructures in the S2 region can be alternating with one annular microstructure as a group, or with multiple microstructures as a group; when multiple microstructures are arranged alternately as a group, the number of microstructures in each group can be the same, or the number of microstructures in each group can be different. Microstructures in the same group can use the same equivalent focal length or different equivalent focal lengths; microstructures in different groups can use the same equivalent focal length or different equivalent focal lengths; but two adjacent groups cannot use the same equivalent focal length.

[0026] like Figure 5 As shown, the ridge bottom angle α of each microstructure in the two regions S1 and S2 must satisfy the following relationship to reduce the generation of stray light: Wherein, d1 represents the distance from the center of the zoom reflector (A1) to the center of the beam splitter (A2); d2 represents the distance from the center of the beam splitter (A2) to the center of the viewing plane; s represents the distance from the incident point of the light on the zoom reflector (A1) to the center of the zoom reflector; l represents the distance from the viewing position to the center of the viewing plane.

[0027] like Figure 6 As shown, the beam splitter (A2) is located between the zoom reflector (A1) and the object being observed, and is placed at a certain angle to the vertical direction. The beam splitter (A2) has a certain splitting ratio, which can transmit part of the light and reflect part of the light. Its function is to project the image of the object being observed to a certain distance in front of the human eye, and project the defocused image in front of the retina of the human eye.

[0028] Embodiment 2: As a specific implementation method, based on Example 1, the zoom reflector (A1) is located 518 mm above the observed object, with a length of 340 mm and a width of 290 mm. The central area is the S1 area, and the surrounding edge area is the S2 area. The S1 area consists of an equivalent focal length F1 of 593.2305 mm (a curvature radius of 1186.461 mm, a cone coefficient of 1.079, and a second-order term of 2.807*10 -6 , the 4th order term is -2.118*10 -12 , the 6th order term is -9.786*10 -14 , the 8th order term is 2.649*10 -21 ) is composed of a concentric ring microstructure array, and the S2 area is composed of an equivalent focal length F1 of 593.2305mm (the radius of curvature is 1186.461mm, the cone coefficient is 1.079, and the second-order term is 2.807*10 -6 , the 4th order term is -2.118*10 -12 , the 6th order term is -9.786*10 -14 , the 8th order term is 2.649*10 -21 ) and the equivalent focal length Fv (v=2) is 338.83425mm (the radius of curvature is 677.6685mm, the cone coefficient is -0.4132, and the second-order term is 2.349*10 -5 , the 4th order term is -8.499*10 -9 , the 6th order term is -8.779*10 -14 , the 8th order term is 3.077*10 -21 ) are composed of concentric ring microstructures arranged alternately in groups of one microstructure, such as Figure 7 shown.

[0029] The beam splitter (A2) is located between the zoom reflector (A1) and the observed object, 150 mm away from the zoom reflector (A1), 400 mm away from the human eye, 380 mm long, 340 mm wide, and is placed at an angle of 45° to the vertical direction.

[0030] Compared with the existing system, this imaging system can ultimately enable the human eye to see a clear image in the middle visual area 5m away, while seeing a blurred image with a defocus of 3.5D in the peripheral visual area, achieving a defocused display effect in the peripheral visual area, thereby achieving the purpose of myopia prevention and control.

[0031] Embodiment three: As a specific implementation method, different from the implementation process of Example 2, the S2 area is composed of an equivalent focal length F1 of 593.2305 mm (curvature radius of 1186.461 mm, cone coefficient of 1.079, and second-order term of 2.807*10 -6 , the 4th order term is -2.118*10 -12 , the 6th order term is -9.786*10 -14 , the 8th order term is 2.649*10 -21 ) and the equivalent focal length Fv (v=2) is 338.83425mm (the radius of curvature is 677.6685mm, the cone coefficient is -0.4132, and the second-order term is 2.349*10 -5 , the 4th order term is -8.499*10 -9 , the 6th order term is -8.779*10 -14 , the 8th order term is 3.077*10 -21 ) is composed of a plurality of microstructure arrays arranged alternately as a group, such as Figure 8 shown.

[0032] Compared with the existing system, this imaging system can ultimately enable the human eye to see a clear image in the middle visual area 5m away, while seeing a blurred image with a defocus of 3.5D in the peripheral visual area, achieving a defocused display effect in the peripheral visual area, thereby achieving the purpose of myopia prevention and control.

[0033] Embodiment 4: As a specific implementation method, different from the implementation process of the second and third embodiments, the S2 area is composed of an equivalent focal length F1 of 593.2305 mm (the radius of curvature is 1186.461 mm, the cone coefficient is 1.079, and the second-order term is 2.807*10 -6 , the 4th order term is -2.118*10 -12 , the 6th order term is -9.786*10 -14 , the 8th order term is 2.649*10 -21) and the equivalent focal length Fv (v=2) is 338.83425mm (the radius of curvature is 677.6685mm, the cone coefficient is -0.4132, and the second-order term is 2.349*10 -5 , the 4th order term is -8.499*10 -9 , the 6th order term is -8.779*10 -14 , the 8th order term is 3.077*10 -21 ), the equivalent focal length Fv (v=3) is 334.05mm (the radius of curvature is 668.1mm, the cone coefficient is -0.648, and the second-order term is 3.186*10 -5 , the 4th order term is -4.513*10 -11 , the 6th order term is -6.738*10 -14 , the 8th order term is 2.331*10 -21 ) is composed of multiple microstructures arranged alternately as a group, such as Fig. 9 shown.

[0034] Compared with the existing system, this imaging system can ultimately enable the human eye to see a clear image in the middle visual area 5m away, while seeing a blurred image with a defocus of 3.5D and 4.5D in the peripheral visual area, achieving a defocused display effect in the peripheral visual area, thereby achieving the purpose of myopia prevention and control.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A peripheral visual area defocus imaging system with variable defocus, characterized in that: The system consists of a zoom reflector and a beam splitter. The zoom reflector is located directly above the object being observed, one surface of the zoom reflector is a plane, and the other surface is provided with a microstructure array, and the side provided with the microstructure array faces the object being observed. The beam splitter is located between the zoom reflector and the object being observed, and is placed at a certain angle to the vertical direction. A side of the zoom reflector provided with a microstructure array includes two areas, a central area S1 and a peripheral edge area S2, the S1 area is composed of a concentric ring microstructure array with an equivalent focal length of F1, the S2 area is composed of alternating concentric ring microstructures with equivalent focal lengths of F1 and Fv, Fv is a fixed value or changes with the distance from the concentric ring microstructure to the center of the ring, the centers of the concentric ring microstructures in the S1 area and the S2 area coincide, and the microstructure is a serrated structure distributed in a ring; The light emitted by the observed object passes through the beam splitter to the side of the zoom reflector equipped with a microstructure array, and then reaches the beam splitter after being reflected by the concentric circular microstructure array with an equivalent focal length of F1 on the zoom reflector, and is then reflected into the human eye, and finally forms an enlarged virtual image at a certain distance in front of the human eye; the light reaching the concentric circular microstructure array with an equivalent focal length of Fv on the zoom reflector is reflected to the beam splitter, and then is reflected into the human eye, and finally forms a defocused image with a certain defocus amount in front of the peripheral retina of the human eye.

2. The peripheral visual area defocus imaging system with variable defocus according to claim 1, characterized in that: The distance d3 between the enlarged virtual image formed in front of the human eye by the imaging system and the human eye satisfies the following relationship: Among them, d0 represents the distance from the observed object to the zoom reflector; d1 represents the distance from the zoom reflector to the beam splitter; d2 represents the distance from the beam splitter to the human eye; F1 represents the equivalent focal length of the microstructure array in the S1 area and part of the microstructure array in the S2 area.

3. The peripheral visual area defocus imaging system with variable defocus amount according to claim 1, characterized in that: The defocus amount D of the defocused image formed in front of the peripheral retina of the human eye by the imaging system satisfies the following relationship: Among them, d0 represents the distance from the observed object to the zoom reflector; d1 represents the distance from the zoom reflector to the beam splitter; d2 represents the distance from the beam splitter to the human eye; and Fv represents the equivalent focal length of part of the microstructure array in the S2 region.

4. The peripheral visual area defocus imaging system with variable defocus according to claim 1, characterized in that: The bottom angle α of the ridged structure satisfies the following relationship Among them, d1 represents the distance from the center of the zoom reflector to the center of the beam splitter; d2 represents the distance from the center of the beam splitter to the center of the viewing plane; s represents the distance from the incident point of the light on the zoom reflector to the center of the zoom reflector; l represents the distance from the viewing position to the center of the viewing plane.

5. The peripheral visual area defocus imaging system with variable defocus according to claim 1, characterized in that: When the concentric circular microstructures of the S2 region are arranged, one circular microstructure is arranged alternately as a group.

6. The peripheral visual area defocus imaging system with variable defocus according to claim 1, characterized in that: When the concentric ring microstructures in the S2 region are arranged, one microstructure is arranged as a group and they are arranged alternately.

7. The peripheral visual area defocus imaging system with variable defocus according to claim 1, characterized in that: When the concentric ring microstructures in the S2 region are arranged, a plurality of microstructures are arranged alternately as a group.

8. The peripheral visual area defocus imaging system with variable defocus according to claim 7, characterized in that: When a plurality of microstructures are arranged alternately as a group, the number of microstructures in each group is the same.

9. The peripheral visual area defocus imaging system with variable defocus according to claim 7, characterized in that: When a plurality of microstructures are arranged alternately as a group, the number of microstructures in each group is different.

10. A peripheral visual area defocus imaging system with variable defocus according to any one of claims 6 to 9, characterized in that: Microstructures in the same group use the same or different equivalent focal lengths, and microstructures in two adjacent groups use different equivalent focal lengths.

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