An optical structure for virtual image telephoto imaging

Abstract

The present invention discloses an optical structure for virtual image telephoto imaging, which is arranged in front of an observer and above an observed object, and includes a first reflector and a second reflector. Both the first reflector and the second reflector are isosceles trapezoidal concave structures. The first reflector is arranged directly above the observed object, and the second reflector is arranged in front of the observer. The short side of the first reflector is adjacent to the long side of the second reflector; the concave surface of the first reflector is opposite to the observed object; and the concave surface of the second reflector is opposite to the observer. The present invention magnifies the observed object almost without distortion and presents it in the distance in front of the observer by limiting the size and position of the first reflector and the second reflector, and constraining the ratio of the viewing distance to the equivalent focal length of the optical system, thereby solving the problems of binocular unequal images and excessive diopter difference between the binocular images when the user observes the telephoto image through the existing passive telephoto device, alleviating visual fatigue, and achieving the purpose of myopia prevention and control.

Description

Technical Field

[0001] The invention relates to the technical field of myopia protection, and in particular to an optical structure for virtual image and telescopic image formation. Background Art

[0002] As society develops, people spend more and more time using electronic products or reading books at close range. Especially for young students, they are exposed to more and more electronic products and have increasing academic pressure, which can easily lead to myopia and other eye health problems. Usually, students look down at the textbooks when reading and writing homework. Such long-term study with their heads down can easily cause myopia, further increase in myopia, and other vision problems, as well as hunchbacks and cervical compression.

[0003] Some products with telephoto function currently on the market work by increasing the viewing distance by imaging in the distance in front of the human eye, thereby inhibiting the growth of the eye axis. However, they have the following disadvantages:

[0004] 1. Although the distant image formed by observing the object through the product is magnified, it is far away from the observer's eyes. The image size on the retina is obviously smaller than the image size on the retina when the human eye directly observes the object without using the product. Therefore, if the user observes such a distant image for a long time, visual fatigue will increase to a great extent, thus failing to meet the needs of myopia prevention and control.

[0005] 2. The design only considers the viewing area of ​​one eye, and does not consider the interpupillary distance between the two eyes. Therefore, the user's two eyes cannot see the complete observed object at the same time, that is, one eye of the user can see the complete observed object, but the other eye can only see part of the observed object, and the difference between the two eyes is too large. Studies have shown that when the difference in the size or shape of the left and right eyes reaches 5%, it will cause visual dysfunction such as difficulty in binocular fusion and monocular suppression. The difference between the left and right images of existing products is much higher than 5%. When users use products with the above-mentioned visual defects for a long time, the images seen by both eyes are inconsistent, which will make it difficult for the two eyes to fuse, resulting in greater visual fatigue, making it difficult to achieve the effect of myopia prevention and control. Long-term use may also lead to further deepening of myopia, abnormal binocular vision function, dyslexia, inability to read and write for a long time, and lack of concentration.

[0006] 3. The size of the objective lens does not match the size of the eyepiece, resulting in the user being able to see the distant image of the observed object and the image of the objective lens through the eyepiece at the same time. The image formed by the objective lens is closer to the human eye, while the distant image is farther away. The image distance difference between the distant image and the objective lens may exceed 5m (i.e., the diopter difference exceeds 5D). This will lead to the following three problems: (1) The human eye is more likely to focus on the close-up image formed by the objective lens, which loses the original intention of the product to allow users to observe distant images, and the myopia prevention and control effect is greatly reduced; (2) When the human eye sees images with large distance differences at the same time, the eye will constantly adjust, resulting in visual fatigue; (3) When the observer observes the close-up image with one eye and the distant image with the other eye for a long time, the problem of anisometropia will occur. Studies have shown that when the diopter difference between the two eyes exceeds 2.5D, it will cause visual dysfunction such as difficulty in binocular fusion, resulting in extremely severe discomfort and fatigue, impairing the binocular single vision function, deepening the degree of myopia, and also causing monocular amblyopia and exotropia. Summary of the invention

[0007] In order to solve the following problems of existing passive telescopic devices: (1) the image size of the observed object on the retina is significantly smaller than the image size on the retina when the human eye directly observes the observed object without the telescopic device; (2) one eye of the observer can see the entire observed object, but the other eye can only see a part of the observed object, making it difficult for the binocular image to fuse; (3) the difference in refractive power between the two eyes of the observer is too large when using the existing passive telescopic device. The present invention provides an optical structure for virtual image telescopic imaging, which limits the position distance of the first reflector and the second reflector by considering the interpupillary distance between the two eyes, limiting the relative size relationship between the first reflector and the second reflector, and limiting the ratio of the observation distance and the equivalent focal length, so that the image size of the observed object on the retina is greater than or equal to 0.40 times the image size on the retina when the human eye directly observes the observed object without the telescopic device, so that both eyes can see the entire observed object at the same time and the observer can only see the telescopic image through the eyepiece, thereby avoiding excessive difference in refractive power between the two eyes, alleviating visual fatigue, and ensuring the effect of myopia prevention and control.

[0008] In order to achieve the above object, the technical solution of the present invention is:

[0009] The present invention proposes an optical structure for virtual image telephoto imaging, which is arranged in front of an observer and above an observed object, and includes a first reflector and a second reflector, both of which are isosceles trapezoidal concave structures, the first reflector is arranged directly above the observed object, the second reflector is arranged in front of the observer, the short side of the first reflector is adjacent to the long side of the second reflector, and the long side of the first reflector is close to the observer, so that the observer can observe the observed object conveniently and avoid the observer seeing the frame of the first reflector in the second reflector;

[0010] The concave surface of the first reflector is opposite to the observed object, the first reflector is tilted relative to the horizontal direction, and one end of the first reflector where the short side is located is tilted upward, so as to facilitate the first magnification imaging of the observed object and reflect the information of the observed object to the second reflector;

[0011] The concave surface of the second reflector is opposite to the observer, the second reflector is tilted relative to the vertical direction, and one end of the second reflector where the long side is located is tilted backward, so as to facilitate the second magnification imaging and reflect the magnified information of the observed object to the observer's eyes.

[0012] Furthermore, the distance between the center point of the second reflector and the observer is expressed by the following formula:

[0013]

[0014] Among them, L1 is the distance between the center point of the second reflector and the observer, and F is the equivalent focal length, which is used to ensure that the image size of the observed object on the observer's retina is greater than or equal to 0.40 times the image size on the retina when the object is directly observed. In this way, while having the telephoto function, there is no additional increase in visual fatigue, thereby achieving the effect of myopia prevention and control.

[0015] Furthermore, the height of the second reflector is expressed by the following formula:

[0016]

[0017] Wherein, W2 is the height of the second reflector, F is the equivalent focal length, B is the length of the observed object, F is the equivalent focal length, and L1 is the distance between the center point of the second reflector and the observer.

[0018] The length of the long side of the second reflector is expressed by the following formula:

[0019]

[0020] in, is the angle between the second reflector and the vertical direction, S21 is the length of the long side of the second reflector, W2 is the height of the second reflector, F is the equivalent focal length, A is the width of the observed object, E is the interpupillary distance of the observer, and L1 is the distance between the center point of the second reflector and the observer.

[0021] The length of the short side of the second reflector is expressed by the following formula:

[0022]

[0023] in, is the angle between the second reflector and the vertical direction, S22 is the length of the short side of the second reflector, W2 is the height of the second reflector, F is the equivalent focal length, A is the width of the observed object, E is the interpupillary distance of the observer, and L1 is the distance between the center point of the second reflector and the observer.

[0024] Furthermore, the height of the first reflector is expressed by the following formula:

[0025]

[0026] Wherein, W1 is the height of the first reflector, L1 is the distance between the center point of the second reflector and the observer, d2 is the distance between the center point of the first reflector and the center point of the second reflector, is the angle between the first reflector and the horizontal direction, is the angle between the second reflector and the vertical direction, and W2 is the height of the second reflector.

[0027] The length of the long side of the first reflector is expressed by the following formula:

[0028]

[0029] Wherein, S11 is the length of the long side of the first reflector, W1 is the height of the first reflector, L1 is the distance between the center point of the second reflector and the observer, d2 is the distance between the center point of the first reflector and the center point of the second reflector, is the angle between the first reflector and the horizontal direction, is the angle between the second reflector and the vertical direction, W2 is the height of the second reflector, and S22 is the length of the short side of the second reflector.

[0030] The length of the short side of the first reflector is expressed by the following formula:

[0031]

[0032] in, is the angle between the first reflector and the horizontal direction, S21 is the length of the long side of the second reflector, S12 is the length of the short side of the first reflector, W1 is the height of the first reflector, L1 is the distance between the center point of the second reflector and the observer, d2 is the distance from the center point of the first reflector to the center of the second reflector, is the angle between the second reflector and the vertical direction, and W2 is the height of the second reflector.

[0033] Furthermore, the angle between the first reflector and the horizontal direction is expressed by the following formula:

[0034]

[0035] in, is the angle between the first reflector and the horizontal direction;

[0036] The angle between the second reflector and the vertical direction is expressed by the following formula:

[0037]

[0038] in, is the angle between the second reflector and the vertical direction.

[0039] Furthermore, the vertical distance between the center point of the second reflector and the observed object satisfies:

[0040]

[0041] Wherein, H is the vertical distance between the center point of the second reflector and the observed object.

[0042] Beneficial effects of the present invention:

[0043] 1. The present invention limits the relative ratio of the observation distance and the equivalent focal length to ensure that the image size of the observed object on the observer's retina through the telephoto optical structure is greater than or equal to 0.40 times the image size on the retina when the object is directly observed. In this way, while having the telephoto function, there is no additional increase in visual fatigue, thereby achieving the effect of myopia prevention and control.

[0044] 2. The present invention takes into account the interpupillary distance of both eyes. Based on this, the relationship between the size of the observed object, the size of the eyepiece (the second reflector) and the viewing distance is limited, and the difference in the visual images of the observer's left and right eyes is limited to within 1.5%, which solves the problem of unequal images between the two eyes and better achieves the effect of myopia prevention and control.

[0045] 3. The present invention limits the relative size relationship between the eyepiece and the objective lens (first reflector) so that the observer can only see the distant image through the eyepiece but cannot see the image formed by the objective lens, thereby solving the problem of excessive difference in refractive power between the two eyes, eliminating viewing discomfort, and achieving the effect of myopia prevention and control.

[0046] 4. The present invention limits the distance between the center of the second reflector and the observed object, making it easier for the observer to adjust the second reflector to a distance that suits him / her. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 One of the schematic diagrams of an optical structure for virtual image telephoto imaging provided by an embodiment of the present invention.

[0048] Figure 2 The second schematic diagram of an optical structure for virtual image telephoto imaging provided by an embodiment of the present invention.

[0049] The numbers in the accompanying drawings are: 1 is the observer, 2 is the observed object, 3 is the first reflector, 4 is the second reflector, and 5 is the virtual image and distant image. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Example 1

[0052] like Figure 1~Figure 2 As shown, an optical structure for forming a virtual image telescopic image 5 is arranged in front of an observer 1 and above an observed object 2, and includes a first reflector 3 and a second reflector 4. The first reflector 3 and the second reflector 4 are both isosceles trapezoidal concave structures. Specifically, the concave surface of the first reflector 3 is an aspherical surface or a free-form surface, and the concave surface of the second reflector 4 is a spherical surface, which is convenient for forming a virtual image telescopic image 5 of the observed object 2.

[0053] The first reflector 3 is arranged directly above the observed object 2, and the second reflector 4 is arranged in front of the observer 1. The short side of the first reflector 3 is adjacent to the long side of the second reflector 4, and the long side of the first reflector 3 is close to the observer 1, so as to facilitate the first magnified imaging of the observed object 2 and reflect the information of the observed object 2 to the second reflector 4 through the first reflector 3 and avoid seeing the frame of the second reflector 4 from the first reflector 3.

[0054] The concave surface of the first reflector 3 is opposite to the observed object 2, and the first reflector 3 is at a certain distance from the observed object 2, and the distance is adjusted according to the position of the second reflector 4. The first reflector 3 is tilted relative to the horizontal direction, and the end of the first reflector 3 where the short side is located is tilted upward, which is used to perform the first magnification imaging of the observed object 2 and reflect the information of the observed object 2 to the second reflector 4.

[0055] In order to achieve better myopia prevention and control purposes, it is necessary to limit the shape and position of the first reflector 3. Specifically, the height of the first reflector 3 is the length of the line segment between the two ends of the side of the first reflector 3, and the height of the first reflector 3 is expressed by the following formula:

[0056]

[0057] Wherein, W1 is the height of the first reflector 3, L1 is the distance between the center point of the second reflector 4 and the observer 1, d2 is the distance between the center point of the first reflector 3 and the center point of the second reflector 4, is the angle between the first reflector 3 and the horizontal direction, is the angle between the second reflector 4 and the vertical direction, W2 is the height of the second reflector 4 , and the height of the second reflector 4 is the length of the line segment between the two ends of the side of the second reflector 4 .

[0058] The length of the long side of the first reflector 3 is the length of the line segment between the two ends of the long side of the first reflector 3, which is expressed by the following formula:

[0059]

[0060] Wherein, S11 is the length of the long side of the first reflector 3 , W1 is the height of the first reflector 3 , S22 is the length of the short side of the second reflector 4 , and the length of the short side of the second reflector 4 is the length of the line segment between the two ends of the short side of the second reflector 4 .

[0061] The length of the short side of the first reflector 3 is the length of the line segment between the two ends of the short side of the first reflector 3, which is expressed by the following formula:

[0062]

[0063] Among them, S21 is the length of the long side of the second reflector 4 , the length of the long side of the second reflector 4 is the length of the line segment between the two ends of the long side of the second reflector 4 , and S12 is the length of the short side of the first reflector 3 .

[0064] The concave surface of the second reflector 4 is opposite to the observer 1, so that the observer 1 can observe the observed object 2. The distance between the second reflector 4 and the observer 1 is expressed by the following formula:

[0065]

[0066] Wherein, L1 is the distance between the center point of the second reflector 4 and the observer 1, and F is the equivalent focal length.

[0067] The above formula can ensure that the image size of the observed object 2 on the retina of the observer 1 is greater than or equal to 0.40 times the image size on the retina when the object is directly observed, thereby achieving the effect of myopia prevention and control without increasing visual fatigue while having the telephoto function.

[0068] The second reflector 4 is tilted with respect to the vertical direction, and one end of the second reflector 4 where the long side is located tilts backwards. The function of such a setting is to perform a second magnification imaging and reflect and transmit the magnified information of the observed object 2 to the eyes of the observer 1.

[0069] The height of the second reflector 4 is expressed by the following formula:

[0070]

[0071] Among them, W2 is the height of the second reflector 4, F is the equivalent focal length, B is the length of the observed object 2 (that is, the line segment where the length of the observed object 2 is located is parallel to the line segment where the distance L1 between the center point of the second reflector 4 and the observer 1 is located), and F is the equivalent focal length.

[0072] The length of the long side of the second reflector 4 is expressed by the following formula:

[0073]

[0074] in, is the angle between the second reflector 4 and the vertical direction, S21 is the length of the long side of the second reflector 4, W2 is the height of the second reflector 4, F is the equivalent focal length, A is the width of the observed object 2, the width of the observed object 2 is parallel to the eyes of the observer 1, E is the interpupillary distance between the eyes of the observer 1, and L1 is the distance between the center point of the second reflector 4 and the observer 1.

[0075] The length of the short side of the second reflector 4 is expressed by the following formula:

[0076]

[0077] Wherein, S22 is the length of the short side of the second reflector 4.

[0078] According to the above-mentioned limitation on the side lengths of the first reflector 3 and the second reflector 4, when the long side length S21≤370mm, the short side length S22≤270mm and the height W2≤260mm of the second reflector 4, the long side length of the first reflector 3 is S11≤500mm, the short side length is S12≤430mm and the height is W1≤350mm.

[0079] The present invention makes the image size of the observed object 2 on the retina of the observer 1 through the optical structure of virtual image and telephoto imaging significantly larger than the image size of the observed object 2 on the retina of the observer 1 when the observed object 2 is directly observed, and the difference between the left and right eyes of the observer 1 is within 1.5%. The observer 1 can only see the telephoto image through the second reflector but cannot see the image formed by the first reflector, thereby eliminating discomfort and achieving the effect of myopia prevention and control.

[0080] Preferably, the angle between the first reflector 3 and the horizontal direction and the angle between the second reflector 4 and the vertical direction need to satisfy:

[0081]

[0082]

[0083] Preferably, the vertical distance between the center of the second reflector 4 and the observed object 2 satisfies:

[0084]

[0085] Wherein, H is the vertical distance between the center of the second reflector 4 and the observed object 2.

[0086] The vertical distance between the center of the second reflector 4 and the observed object 2 is limited by the simulation experiment, so that the participants can adjust the second reflector to a distance suitable for themselves.

[0087] Example 2

[0088] In specific applications, the corresponding dimensions can be selected according to the restrictions on the first reflector 3 and the second reflector 4. For example, the long side length S11 of the first reflector 3 is 453 mm, the short side length S12 is 387 mm, the height W1 is 322 mm, and the angle between the first reflector 3 and the horizontal direction is It is 18.9°.

[0089] The second reflector 4 has a long side length S21 of 359 mm, a short side length S22 of 258 mm, a height W2 of 244 mm, and an angle between the second reflector 4 and the horizontal direction. It is 22.3°.

[0090] The distance d2 between the center point of the first reflector 3 and the center point of the second reflector 4 is 213 mm.

[0091] According to the arrangement of the first reflector 3 and the second reflector 4, the width of the observed object 2 is arranged parallel to the eyes of the observer 1. When in use, the information of the observed object 2 is magnified and imaged for the first time, and the information of the observed object 2 is reflected to the second reflector 4. The second reflector 4 performs a second magnification and image formation and reflects the magnified information of the observed object 2 to the eyes of the observer 1. The observer 1 sees the virtual image 5 of the observed object 2, and the myopia problem caused by excessively looking down at the observed object 2 is avoided.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical structure for virtual image telephoto imaging, arranged in front of an observer (1) and above an observed object (2), characterized in that: The invention comprises a first reflector (3) and a second reflector (4), wherein the first reflector (3) and the second reflector (4) are both isosceles trapezoidal concave structures, the first reflector (3) is arranged directly above the observed object (2), the second reflector (4) is arranged in front of the observer (1), the short side of the first reflector (3) is adjacent to the long side of the second reflector (4), and the long side of the first reflector (3) is close to the observer (1); The concave surface of the first reflector (3) is opposite to the observed object (2), the first reflector (3) is arranged to be inclined relative to the horizontal direction, and the end of the first reflector (3) where the short side is located is inclined upward; The concave surface of the second reflector (4) is opposite to the observer (1), the second reflector (4) is arranged to be inclined relative to the vertical direction, and the end of the second reflector (4) where the long side is located is inclined backwards; The distance between the second reflector (4) and the observer (1) is expressed by the following formula: Wherein, L1 is the distance between the center point of the second reflector (4) and the observer (1), and F is the equivalent focal length; The height of the second reflector (4) is expressed by the following formula: Wherein, W2 is the height of the second reflector (4), B is the length of the observed object (2), F is the equivalent focal length, and L1 is the distance between the center point of the second reflector (4) and the observer (1); The length of the long side of the second reflector (4) is expressed by the following formula: Wherein, θ2 is the angle between the second reflector (4) and the vertical direction, S21 is the length of the long side of the second reflector (4), W2 is the height of the second reflector (4), F is the equivalent focal length, A is the width of the observed object (2), E is the interpupillary distance between the observer (1), and L1 is the distance between the center point of the second reflector (4) and the observer (1); The length of the short side of the second reflector (4) is expressed by the following formula: Wherein, θ2 is the angle between the second reflector (4) and the vertical direction, S22 is the length of the short side of the second reflector (4), W2 is the height of the second reflector (4), F is the equivalent focal length, A is the width of the observed object (2), E is the interpupillary distance between the observer (1), and L1 is the distance between the center point of the second reflector (4) and the observer (1).

2. The optical structure of virtual image telephoto imaging according to claim 1, characterized in that: The height of the first reflector (3) is expressed by the following formula: Wherein, W1 is the height of the first reflector (3), L1 is the distance between the center point of the second reflector (4) and the observer (1), d2 is the distance between the center point of the first reflector (3) and the center point of the second reflector (4), θ1 is the angle between the first reflector (3) and the horizontal direction, θ2 is the angle between the second reflector (4) and the vertical direction, and W2 is the height of the second reflector (4); The length of the long side of the first reflector (3) is expressed by the following formula: Wherein, S11 is the length of the long side of the first reflector (3), W1 is the height of the first reflector (3), L1 is the distance between the center point of the second reflector (4) and the observer (1), d2 is the distance between the center point of the first reflector (3) and the center point of the second reflector (4), θ1 is the angle between the first reflector (3) and the horizontal direction, θ2 is the angle between the second reflector (4) and the vertical direction, W2 is the height of the second reflector (4), and S22 is the length of the short side of the second reflector (4); The length of the short side of the first reflector (3) is expressed by the following formula: Wherein, θ1 is the angle between the first reflector (3) and the horizontal direction, S21 is the length of the long side of the second reflector (4), S12 is the length of the short side of the first reflector (3), W1 is the height of the first reflector (3), L1 is the distance between the center point of the second reflector (4) and the observer (1), d2 is the distance between the center point of the first reflector (3) and the center point of the second reflector (4), θ2 is the angle between the second reflector (4) and the vertical direction, and W2 is the height of the second reflector (4).

3. The optical structure of virtual image telephoto imaging according to claim 2, characterized in that: The angle between the first reflector (3) and the horizontal direction is expressed by the following formula: 10°≤θ1≤21.5° Wherein, θ1 is the angle between the first reflector (3) and the horizontal direction; The angle between the second reflector (4) and the vertical direction is expressed by the following formula: 22°<θ2≤30° Wherein, θ2 is the angle between the second reflector (4) and the vertical direction.

4. The optical structure of virtual image telephoto imaging according to claim 1, characterized in that: The vertical distance between the center point of the second reflector (4) and the observed object (2) satisfies: 29cm≤H≤45cm Wherein, H is the vertical distance between the center point of the second reflector (4) and the observed object (2).

5. The optical structure of virtual image telephoto imaging according to claim 1, characterized in that: The image size of the observed object (2) on the retina of the observer (1) through the optical structure of virtual image and telephoto image formation is greater than or equal to 0.40 times the image size of the observed object (2) on the retina of the observer (1) when directly observing the observed object (2), the difference between the left and right eyes of the observer (1) is within 1.5%, and the observer (1) can only see the telephoto image through the second reflector (4) and cannot see the image formed by the first reflector (3).

Images