A peripheral vision defocus imaging system with variable defocus amount

Abstract

The present invention discloses a defocus variable peripheral visual field defocus imaging system, which is composed of a zoom mirror and a beam splitter; the zoom mirror is located directly above the object to be observed, and the side with the microstructure array faces the object to be observed; the beam splitter is located between the zoom mirror and the object to be observed and is placed at a certain angle with respect to the vertical direction; the side of the zoom mirror with the microstructure array includes two regions, the central region S1 and the surrounding 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 equivalent focal lengths of F1 and Fv. The centers of the concentric rings in the S1 region and the S2 region coincide, and the microstructure is a tooth structure with a ring distribution. The present invention adopts a microstructure array, and the structure parameters of the microstructure array that can be flexibly adjusted can freely control the defocus amount, realizing a defocus image with variable defocus amount and uniform brightness, thereby achieving a good myopia prevention and control effect.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and particularly to a peripheral visual field defocus imaging system with variable defocus amount. Background Art

[0002] Due to changes in modern lifestyles, the widespread use of electronic products, increased learning pressure, and reduced outdoor activity time, the incidence of myopia among children and adolescents has been increasing year by year and shows a trend of low age and high myopia. The number of myopic people globally is growing rapidly, and the number of Chinese students with myopia ranks first in the world. Myopia prevention and control has become the focus of social attention. As an innovative myopia prevention and control product, the defocus reading and writing desk has a broad market prospect and a large potential customer group.

[0003] However, existing reading and writing desks with defocus functions use a hyperbolic mirror to simultaneously achieve the functions of far vision and defocus. The curved mirror has a large volume and weight, and the image brightness in the defocus area is inconsistent. In addition, the degrees of freedom of the curved mirror are limited, making it difficult to freely adjust the defocus amount. Therefore, this type of defocus reading and writing desk has a large volume, high complexity, and uneven defocus image brightness, making 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 field defocus imaging system with variable defocus amount, which uses a microstructure array to achieve the functions of far vision and defocus of the reading and writing desk, reduces the system volume and system complexity, and the structure parameters of the microstructure array that can be flexibly adjusted can freely control the defocus amount to achieve a defocus image with variable defocus amount and uniform brightness, thereby achieving a good myopia prevention and control effect.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A peripheral visual field defocus imaging system with variable defocus amount, which is composed of a zoom mirror and a beam splitter; the zoom mirror is located directly above the object to be observed, one surface of the zoom mirror is a plane, and a microstructure array is provided on the other surface, and the surface with the microstructure array faces the object to be observed; the beam splitter is located between the zoom mirror and the object to be observed and is placed at an angle to the vertical direction.

[0007] The surface of the zoom mirror with the microstructure array includes two regions, a central region S1 and a surrounding edge region S2. Region S1 is composed of a concentric ring microstructure array with an equivalent focal length of F1, and region S2 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 of the concentric ring microstructure from the center of the ring. The centers of the concentric ring microstructures in regions S1 and S2 coincide, and the microstructure is a tooth structure distributed in a ring.

[0008] The light emitted by the object to be observed passes through the spectroscope and reaches the side of the zoom mirror with the microstructure array. Then, after being reflected by the concentric circular ring microstructure array with an equivalent focal length of F1 on the zoom mirror, it reaches the spectroscope, and then is reflected into the human eye. Finally, an enlarged virtual image is formed at a certain distance in front of the human eye. The light reaching the concentric circular ring microstructure array with an equivalent focal length of Fv on the zoom mirror is reflected to the spectroscope, and then is reflected into the human eye. Finally, a defocused image with a certain defocus amount is formed in front of the peripheral retina of the human eye.

[0009] Further, 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 relational expression

[0010]

[0011] wherein, d0 represents the distance from the object to be observed to the zoom mirror; d1 represents the distance from the zoom mirror to the spectroscope; d2 represents the distance from the spectroscope 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.

[0012] Further, 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 relational expression

[0013]

[0014] wherein, d0 represents the distance from the object to be observed to the zoom mirror; d1 represents the distance from the zoom mirror to the spectroscope; d2 represents the distance from the spectroscope to the human eye; Fv represents the equivalent focal length of part of the microstructure array in the S2 area.

[0015] Further, the base angle α of the tooth structure satisfies the following relational expression

[0016]

[0017] wherein, d1 represents the distance from the center of the zoom mirror to the center of the spectroscope; d2 represents the distance from the center of the spectroscope to the center of the viewing plane; s represents the distance from the incident point of the light on the zoom mirror to the center of the zoom mirror; l represents the distance from the viewing position to the center of the viewing plane.

[0018] Further, when the concentric circular ring microstructures in the S2 area are arranged, one circular ring microstructure is taken as a group for alternating arrangement.

[0019] Further, when the concentric circular ring microstructures in the S2 area are arranged, one microstructure is taken as a group for alternating arrangement.

[0020] Further, when arranging the concentric circular ring microstructures in the S2 area, multiple microstructures are arranged alternately in groups.

[0021] Further, when multiple microstructures are arranged alternately in groups, the number of microstructures in each group is the same.

[0022] Further, when multiple microstructures are arranged alternately in groups, the number of microstructures in each group is different.

[0023] Further, the microstructures within the same group adopt the same or different equivalent focal lengths, and the microstructures in adjacent groups adopt different equivalent focal lengths.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The present invention uses a microstructure array to achieve the functions of far vision and defocus, reduces the system volume and system complexity, and the structure parameters of the microstructure array that can be flexibly adjusted can freely control the defocus amount, realizing a defocus image with variable defocus amount and uniform brightness, thereby achieving a good myopia prevention and control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a variable defocus peripheral visual field defocus imaging system according to an embodiment of the present invention;

[0027] Figure 2 It is one of the schematic structural diagrams of one side of the zoom mirror provided with a microstructure array according to an embodiment of the present invention;

[0028] Figure 3 It is one of the schematic parameter setting diagrams of a variable defocus peripheral visual field defocus imaging system according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the zoom mirror according to an embodiment of the present invention;

[0030] Figure 5 It is the second of the schematic parameter setting diagrams of a variable defocus peripheral visual field defocus imaging system according to an embodiment of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the beam splitter according to an embodiment of the present invention;

[0032] Figure 7 It is the second of the schematic structural diagrams of one side of the zoom mirror provided with a microstructure array according to an embodiment of the present invention;

[0033] Figure 8 It is the third of the schematic structural diagrams of one side of the zoom mirror provided with a microstructure array according to an embodiment of the present invention;

[0034] Figure 9This is the fourth schematic diagram of the structure of the side with the microstructure array of the zoom mirror according to the embodiment of the present invention. Detailed implementation manners

[0035] The present invention will be further explained and described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Embodiment 1

[0037] As Figure 1 shown, a defocus variable peripheral vision defocus imaging system consists of two parts: a zoom mirror (A1) and a beam splitter (A2). The zoom mirror (A1) is located directly above the object to be observed. A microstructure array is provided on one surface of the zoom mirror, and the surface with the microstructure array faces the object to be observed. The beam splitter (A2) is located between the zoom mirror (A1) and the object to be observed and is placed at an angle to the vertical direction.

[0038] One surface of the zoom mirror (A1) is a plane, and a microstructure array is provided on the other surface. As Figure 2 shown, the surface of the zoom mirror (A1) with the microstructure array includes two regions: a central region S1 and a surrounding edge region S2. The S1 region consists of a concentric ring microstructure array with an equivalent focal length of F1, and the S2 region consists of concentric ring 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 of the concentric ring microstructure from the center of the ring, etc.) arranged alternately. The centers of the concentric ring microstructures in the S1 region and the S2 region coincide, and the microstructure is a tooth structure distributed in a ring.

[0039] The function of the zoom mirror (A1) is to form a magnified image of the object to be observed by the microstructure array with an equivalent focal length of F1 and 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 object to be observed to a certain distance in front of the human eye and project the defocused image to in front of the human eye retina.

[0040] The imaging principle of the system is as follows: The light emitted by the object to be observed first passes through the beam splitter (A2) and reaches the surface of the zoom mirror (A1) with a micro-structure array. Then, after being reflected by the concentric-ring micro-structure array with an equivalent focal length of F1 on the zoom mirror (A1), it reaches the beam splitter (A2), and then is reflected into the human eye. Finally, an enlarged virtual image is formed at a certain distance in front of the human eye; The light reaching the concentric-ring micro-structure array with an equivalent focal length of Fv on the zoom mirror (A1) will be reflected to the beam splitter (A2), and then be reflected into the human eye, and finally a defocused image with a certain defocus amount is formed in front of the peripheral retina of the human eye. Finally, the human eye can see an enlarged virtual image of the object to be observed that is clear in the middle visual area in the distance and blurred in the peripheral visual area, realizing the display effect of defocus in the peripheral visual area, thereby achieving the purpose of myopia prevention and control.

[0041] As Figure 3 shown, the distance d3 of the enlarged virtual image formed in front of the human eye by the imaging system satisfies the relationship

[0042]

[0043] where, d0 represents the distance from the object to be observed to the zoom mirror (A1); d1 represents the distance from the zoom mirror (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 micro-structure array in the S1 area and part of the micro-structure array in the S2 area.

[0044] 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

[0045]

[0046] where, d0 represents the distance from the object to be observed to the zoom mirror (A1); d1 represents the distance from the zoom mirror (A1) to the beam splitter (A2); d2 represents the distance from the beam splitter (A2) to the human eye; Fv represents the equivalent focal length of part of the micro-structure array in the S2 area.

[0047] Next, each component of the peripheral vision area defocus imaging system with variable defocus amount will be introduced in detail.

[0048] As Figure 4As shown, the zoom mirror (A1) is located directly above the object to be observed. One surface of the zoom mirror (A1) is a plane, and a microstructure array is provided on the other surface. The surface with the microstructure array includes two regions, a central region S1 and a peripheral edge region S2. Region S1 consists of a concentric ring microstructure array with an equivalent focal length of F1, and region S2 consists of concentric ring 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 of the circular ring microstructure from the surface center, etc.) arranged alternately. The centers of the concentric rings in regions S1 and S2 coincide. The function of the zoom mirror (A1) is to form a magnified image of the object to be observed by the microstructure array with an equivalent focal length of F1 and a defocused image with a certain defocus amount by the microstructure array with an equivalent focal length of Fv.

[0049] In region S2, Fv can be a fixed value or a variable value. For example, Fv can change with the distance of the circular ring microstructure from the surface center, etc. The arrangement of the microstructures in region S2 can be alternated with one circular ring microstructure as a group, or alternated with multiple microstructures as a group; when alternated with multiple microstructures as a group, the number of microstructures in each group can be the same or different. The microstructures within the same group can have the same equivalent focal length or different equivalent focal lengths; the microstructures in different groups can have the same equivalent focal length or different equivalent focal lengths; however, adjacent groups cannot have the same equivalent focal length.

[0050] As Figure 5 shown, the bottom angle α of the teeth of each microstructure in regions S1 and S2 needs to satisfy the following relationship to reduce the generation of stray light:

[0051]

[0052] where d1 represents the distance from the center of the zoom mirror (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 mirror (A1) to the center of the zoom mirror; and l represents the distance of the viewing position from the center of the viewing plane.

[0053] As Figure 6 shown, the beam splitter (A2) is located between the zoom mirror (A1) and the object to be observed and is placed at an angle to the vertical direction. The beam splitter (A2) has a certain splitting ratio and can transmit a part of the light and reflect a part of the light. Its function is to project the image of the object to be observed to a certain distance in front of the human eye and project the defocused image in front of the human eye retina.

[0054] Example 2:

[0055] As a specific implementable manner, on the basis of Embodiment 1, the zoom mirror (A1) is located 518 mm directly above the object to be observed, with a length of 340 mm, a width of 290 mm, the central region being the S1 region, and the surrounding edge region being the S2 region. The S1 region is composed of a concentric ring microstructure array with an equivalent focal length F1 of 593.2305 mm (radius of curvature of 1186.461 mm, conic coefficient of 1.079, second-order term of 2.807*10 -6 and fourth-order term of -2.118*10 -12 and sixth-order term of -9.786*10 -14 and eighth-order term of 2.649*10 -21 ). The S2 region is composed of a concentric ring microstructure with an equivalent focal length F1 of 593.2305 mm (radius of curvature of 1186.461 mm, conic coefficient of 1.079, second-order term of 2.807*10 -6 and fourth-order term of -2.118*10 -12 and sixth-order term of -9.786*10 -14 and eighth-order term of 2.649*10 -21 ), and a concentric ring microstructure with an equivalent focal length Fv(v = 2) of 338.83425 mm (radius of curvature of 677.6685 mm, conic coefficient of -0.4132, second-order term of 2.349*10 -5 , fourth-order term of -8.499*10 -9 , sixth-order term of -8.779*10 -14 , and eighth-order term of 3.077*10 -21 ), arranged alternately in groups of one microstructure, as shown in Figure 7 .

[0056] The beam splitter (A2) is located between the zoom mirror (A1) and the object to be observed, 150 mm away from the zoom mirror (A1), 400 mm away from the human eye, with a length of 380 mm, a width of 340 mm, and is placed at an angle of 45° to the vertical direction.

[0057] Compared with the existing system, this imaging system can finally achieve that the human eye can see a clear image in the middle visual field at a distance of 5 m, while seeing a blurred image with a defocus amount of 3.5 D in the peripheral visual field, realizing the display effect of defocus in the peripheral visual field, so as to achieve the purpose of myopia prevention and control.

[0058] Embodiment 3:

[0059] As a specific implementable manner, different from the implementation process of Embodiment 2, the S2 region is composed of a concentric ring microstructure with an equivalent focal length F1 of 593.2305 mm (radius of curvature of 1186.461 mm, conic coefficient of 1.079, second-order term of 2.807*10 -6, the fourth-order term is -2.118*10 -12 , the sixth-order term is -9.786*10 -14 , the eighth-order term is 2.649*10 -21 ), and the equivalent focal length Fv (v = 2) is 338.83425 mm (the radius of curvature is 677.6685 mm, the conic coefficient is -0.4132, the second-order term is 2.349*10 -5 , the fourth-order term is -8.499*10 -9 , the sixth-order term is -8.779*10 -14 , the eighth-order term is 3.077*10 -21 ) consists of concentric ring microstructures with multiple microstructural arrays arranged alternately in groups, as shown in Figure 8 .

[0060] Compared with the existing system, the imaging system can finally achieve a clear image in the middle visual field at a distance of 5 m that can be seen by the human eye, while seeing a blurred image with a defocus amount of 3.5 D in the peripheral visual field, achieving the display effect of defocus in the peripheral visual field, thereby achieving the purpose of myopia prevention and control.

[0061] Example 4:

[0062] As a specific implementable manner, different from the implementation processes of Example 2 and Example 3, the S2 area consists of an equivalent focal length F1 of 593.2305 mm (the radius of curvature is 1186.461 mm, the conic coefficient is 1.079, the second-order term is 2.807*10 -6 , the fourth-order term is -2.118*10 -12 , the sixth-order term is -9.786*10 -14 , the eighth-order term is 2.649*10 -21 ), and the equivalent focal length Fv (v = 2) is 338.83425 mm (the radius of curvature is 677.6685 mm, the conic coefficient is -0.4132, the second-order term is 2.349*10 -5 , the fourth-order term is -8.499*10 -9 , the sixth-order term is -8.779*10 -14 , the eighth-order term is 3.077*10 -21 ), and the equivalent focal length Fv (v = 3) is 334.05 mm (the radius of curvature is 668.1 mm, the conic coefficient is -0.648, the second-order term is 3.186*10 -5 , the fourth-order term is -4.513*10 -11 , the sixth-order term is -6.738*10 -14 , the eighth-order term is 2.331*10 -21 ) consists of concentric ring microstructures with multiple microstructures arranged alternately in groups, as shown in Figure 9 .

[0063] Compared with the existing system, this imaging system can finally achieve the effect that when a person's eyes see a clear image in the mesopic region at a distance of 5 m, they can also see a blurred image with defocus amounts of 3.5 D and 4.5 D in the peripheral visual region, realizing the defocus display effect in the peripheral visual region, so as to achieve the purpose of myopia prevention and control.

[0064] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope 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. A 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 amount 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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