Optical elements and imaging intervention devices for light field manipulation

Abstract

An optical element and imaging intervention device for light field modulation are disclosed. The optical element includes a lens substrate having a radial direction and a thickness direction perpendicular to the radial direction. A central visual region and a slow-light modulation region are formed on the lens substrate. The central visual region is formed in the middle of the lens substrate, and the slow-light modulation region is arranged around the central visual region. The slow-light modulation region includes multiple photonic crystals arranged in an array on the lens substrate to reduce the group velocity of light passing through the slow-light modulation region. This optical element can effectively control myopia.

Description

Technical Field

[0001] This utility model relates to the field of optical components technology, and in particular to an optical element and imaging intervention device for light field modulation. Background Technology

[0002] Myopia has become an increasingly serious problem in the global vision health field. For a long time, the market for myopia control lenses has been dominated by products that utilize microlens defocus technology. This technology creates a defocused area by designing a microlens array on the lens, thereby slowing down the increase in the axial length of the eye and controlling the progression of myopia.

[0003] However, the defocus signal of this technology is highly regular, and the control method and the path of the light after control are relatively simple, making it unable to effectively control myopia. Utility Model Content

[0004] This invention provides an optical element and imaging intervention device for light field modulation, which can effectively control myopia.

[0005] This invention provides an optical element for light field modulation, including a lens substrate. The lens substrate has a radial direction and a thickness direction perpendicular to the radial direction. A central visual region and a slow-light modulation region are formed on the lens substrate. The central visual region is formed in the middle of the lens substrate. The slow-light modulation region is arranged around the central visual region. The slow-light modulation region includes a plurality of photonic crystals arranged in an array on the lens substrate to reduce the group velocity of light passing through the slow-light modulation region.

[0006] Furthermore, the material of the lens substrate is any one of resin, acrylic, PC, MR-8, Trivex, CR-39, and PMMA.

[0007] Furthermore, the refractive index of the central visual region is one of 1.50, 1.56, 1.591, 1.60, 1.67, 1.71, 1.74, and 1.76.

[0008] Furthermore, the central visual region can be any one of a circle, an ellipse, or a polygon.

[0009] Furthermore, the distance between the geometric center of the central visual region and the geometric center of the lens substrate does not exceed 10mm.

[0010] Furthermore, the geometric center of the central visual region and the geometric center of the lens substrate coincide with each other.

[0011] Furthermore, the maximum span of the central visual area is 1-15mm.

[0012] Furthermore, the gap between adjacent photonic crystals is 80-350 nm, and the lattice constant of the photonic crystal itself is 80-350 nm.

[0013] Furthermore, in the radial direction of the lens substrate, an array of photonic crystals is arranged along a predetermined region, and the curvature of the array of photonic crystals is the same as the curvature of the lens substrate in the slow light modulation region.

[0014] Furthermore, in the radial direction of the lens substrate, the array of photonic crystals is arranged in the form of a wavy surface, a hyperbolic paraboloid, or a planar surface.

[0015] Furthermore, the array-shaped photonic crystal is arranged in a single layer or multiple layers. When the array-shaped photonic crystal is arranged in multiple layers, the distance between two adjacent layers is 80-350nm.

[0016] Furthermore, the arrayed photonic crystal is a one-dimensional or two-dimensional photonic crystal, and its lattice constant is calculated using the following formula:

[0017]

[0018] Where a is the lattice constant; λ is the center wavelength of the photonic bandgap of the target light; is the average refractive index of photonic crystal 121.

[0019] Furthermore, the arrayed photonic crystal is a three-dimensional photonic crystal, and its lattice constant is calculated using the following formula:

[0020]

[0021] Where a is the lattice constant; λ is the center wavelength of the photonic bandgap of the target light, which in this embodiment can be the wavelength of visible light; is the average refractive index of photonic crystal 121.

[0022] Furthermore, on the first and / or second surfaces of the light field modulation region, the curvature of the lens substrate varies at different locations.

[0023] This invention also provides an imaging intervention device, including the aforementioned optical element for light field modulation.

[0024] Furthermore, the imaging intervention device is eyeglasses, a beam splitter for a distant image screen, or a concave mirror for a distant image screen.

[0025] In summary, in this invention, by setting an array of photonic crystals within the lens substrate, the array of photonic crystals can reduce the group velocity of light at the edge of the photonic bandgap through the equivalent medium theory or the photonic bandgap effect. This can lead to an extension of the light transmission time within the lens substrate, resulting in a time delay.

[0026] When a user views an object through this optical element, a portion of the light emitted from the observed object enters the user's eye through the central visual region; this portion of light is normal and has a normal propagation path. However, when the other portion of the light emitted from the observed object passes through the slow-light modulation region, the presence of photonic crystals in the array significantly reduces the group velocity of the light at the edge of the photonic bandgap. At this point, an optical path difference is created between the central visual region and the slow-light modulation region, producing the slow-light phenomenon. These two different light signals from the same object stimulate optic nerve cells such as rod cells, bipolar cells, and ganglion cells, which then transmit signals to the brain, optic nerve, retina, choroid, and sclera via the optic nerve system to slow down axial elongation, thus better controlling myopia.

[0027] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] Figure 1 The diagram shown is a top view of the optical element provided in the first embodiment of this utility model.

[0029] Figure 2 As shown Figure 1 A schematic diagram of the cross-sectional structure of an optical element.

[0030] Figure 3 As shown Figure 1 A schematic diagram of the arrangement of photonic crystals within the lens substrate.

[0031] Figure 4 The diagram shown is a schematic diagram of the arrangement of photonic crystals in the lens substrate in the optical element provided in the second embodiment of this utility model. Detailed Implementation

[0032] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the present utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0033] This invention provides an optical element and imaging intervention device for light field modulation, which can effectively control myopia.

[0034] like Figures 1 to 3 As shown, the optical element provided in this embodiment of the present invention includes a lens substrate 10. The lens substrate 10 has a radial direction and a thickness direction perpendicular to the radial direction. A central visual region 11 and a slow-light control region 12 are formed on the lens substrate 10. The central visual region 11 is located in the middle of the lens substrate 10, and the slow-light control region 12 is arranged around the central visual region 11 along the radial direction of the lens substrate 10. It can be understood that the central visual region 11 is a normal visible region, which may have a certain curvature to refract light to a limited extent, or it may be a plane.

[0035] The slow light modulation region 12 includes multiple photonic crystals 121 arranged in an array and disposed on the lens substrate 10 to reduce the group velocity of light passing through the slow light modulation region 12.

[0036] In this embodiment, by setting an array of photonic crystals 121 in the lens substrate 10, the array of photonic crystals 121 can reduce the group velocity of light at the edge of the photonic bandgap through the equivalent medium theory or the photonic bandgap effect. This can lead to an extension of the light transmission time in the lens substrate 10, resulting in a time delay.

[0037] When a user views an object through this optical element, a portion of the light emitted from the observed object enters the user's eye through the central visual region 11; this portion of light is normal and has a normal propagation path. However, when another portion of the light emitted from the observed object passes through the slow-light modulation region 12, the presence of the arrayed photonic crystals 121 significantly reduces the group velocity of the light at the edge of the photonic bandgap. At this point, an optical path difference is formed between the central visual region 11 and the slow-light modulation region 12, resulting in the slow-light phenomenon. These two different light signals from the same object stimulate optic nerve cells such as rod cells, bipolar cells, and ganglion cells, which then transmit signals to the brain, optic nerve, retina, choroid, and sclera via the optic nerve system, delaying axial elongation and thus better controlling myopia.

[0038] In this embodiment, the material of the lens substrate 10 can be any one of resin, acrylic, PC, MR-8, Trivex, CR-39, and PMMA.

[0039] Furthermore, in this embodiment, the central visual region 11 can be any one of a circle, an ellipse, or a polygon. The distance between the geometric center of the central visual region 11 and the geometric center of the lens substrate 10 does not exceed 10mm. Preferably, the geometric center of the central visual region 11 and the geometric center of the lens substrate 10 coincide to ensure the accuracy of the curvature of the central visual region 11. The maximum span of the central visual region 11 is 1-15mm.

[0040] In the central visual region 11, the refractive index can be one of 1.50, 1.56, 1.591, 1.60, 1.67, 1.71, 1.74, or 1.76.

[0041] Furthermore, in this embodiment, the span of the slow light control region 12, that is, the distance between the outer edge of the slow light control region 12 and the inner edge of the slow light control region 12, is 15-75mm.

[0042] In this embodiment, the array of photonic crystals 121 can be controlled by its own structure and the gap between adjacent photonic crystals 121 to block the propagation of light, thereby forming a photonic bandgap.

[0043] Preferably, the gap between adjacent photonic crystals 121 is 80-350 nm. The lattice constant of the photonic crystal 121 itself can be 80-350 nm. More preferably, when the photonic crystal 121 is a cube, its length, width, and height can all be 80-350 nm. When the photonic crystal 121 is spherical, its diameter is 80-350 nm.

[0044] In this embodiment, the array of photonic crystals 121 is disposed within the lens substrate 10 and arranged radially along the lens substrate 10. In other embodiments, the array of photonic crystals 121 can also be disposed on the front surface (i.e., the surface of the lens substrate 10 away from the user) and the rear surface (i.e., the surface of the lens substrate 10 close to the user) of the lens substrate 10.

[0045] In this embodiment, the array-shaped photonic crystal 121 can be a single layer or multiple layers ( Figure 2 (This shows its structure when it has two layers). When the array-shaped photonic crystal 121 is arranged in multiple layers, the distance between two adjacent layers is 80-350 nm.

[0046] In this embodiment, the array of photonic crystals 121 can be arranged along a set curvature in the radial direction of the lens substrate 10. Preferably, the curvature of the array of photonic crystals 121 is the same as the curvature of the lens substrate 10 in the slow light modulation region 12. In this embodiment, the array of photonic crystals 121 can be a one-dimensional photonic crystal, a two-dimensional photonic crystal, or a three-dimensional photonic crystal.

[0047] More specifically, in this embodiment, the formula for calculating the lattice constant of the two-dimensional photonic crystal is:

[0048]

[0049] Where a is the lattice constant; λ is the center wavelength of the photonic bandgap of the target light, which in this embodiment can be the wavelength of visible light, such as 400-780nm; The average refractive index of photonic crystal 121 (the average refractive index of lens substrate 10 and photonic crystal 121).

[0050] This is because the photonic bandgap is essentially a Bragg travel-construction interference of a periodic structure with respect to light of a specific wavelength, satisfying the condition:

[0051] When light is incident perpendicularly ( θ =90°), simplified to

[0052] The following example illustrates the calculation of constants for one-dimensional or two-dimensional photonic crystals:

[0053] Example 1:

[0054] =700 (red light);

[0055] =1.30 (the substrate refractive index is 1.60, and the photonic crystal 121 refractive index is 1.0).

[0056] Therefore, a is approximately 269 nm.

[0057] Example 2:

[0058] =400 (blue light);

[0059] =1.33 (the substrate refractive index is 1.67, and the photonic crystal 121 refractive index is 1.0).

[0060] Therefore, a is approximately 150 nm.

[0061] Example 3:

[0062] =550 (green light);

[0063] =1.28 (the substrate refractive index is 1.56, and the photonic crystal 121 refractive index is 1.0).

[0064] Therefore, a is approximately 215 nm.

[0065] Example 4:

[0066] =595 (Huang Guang);

[0067] =1.30 (the substrate refractive index is 1.60, and the photonic crystal 121 refractive index is 1.0).

[0068] Therefore, a is approximately 229 nm.

[0069] The wavelength of the light to be adjusted can be determined according to the user's own needs, and then the lattice constant of the photonic crystal 121 can be determined.

[0070] When photonic crystal 121 is a three-dimensional photonic crystal, its lattice constant is calculated using the following formula:

[0071]

[0072] Where a is the lattice constant; λ is the center wavelength of the photonic bandgap of the target light, which in this embodiment can be the wavelength of visible light; is the average refractive index of photonic crystal 121.

[0073] The following example illustrates the calculation of the lattice constant of a three-dimensional photonic crystal.

[0074] Example 5:

[0075] =700 (red light);

[0076] =1.3 (the substrate refractive index is 1.60, and the photonic crystal 121 refractive index is 1.0).

[0077] Therefore, a is approximately 311 nm.

[0078] Example 6:

[0079] =400 (blue light);

[0080] =1.33 (the substrate refractive index is 1.67, and the photonic crystal 121 refractive index is 1.0).

[0081] Therefore, a is approximately 173 nm.

[0082] like Figure 4As shown, in the second embodiment of this utility model, the optical element is basically the same as that in the first embodiment. The difference is that, in this embodiment, the array of photonic crystals 121 is arranged in a wavy shape along the radial direction of the lens substrate 10. It can be understood that, in other embodiments, the array of photonic crystals 121 may also be arranged in a planar, hyperbolic paraboloid, or other shapes.

[0083] This invention can use laser engraving to prepare the above-mentioned optical elements on the lens substrate 10.

[0084] This utility model also provides an imaging intervention device, including the above-mentioned optical elements. The imaging intervention device includes, but is not limited to, eyeglasses, a beam splitter for a distant image screen, a concave mirror for a distant image screen, etc. For other technical features of the imaging intervention device, please refer to the prior art, which will not be repeated here.

[0085] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An optical element for light field modulation, comprising a lens substrate having a radial direction and a thickness direction perpendicular to the radial direction, characterized in that: A central visual region and a slow-light modulation region are formed on the lens substrate. The central visual region is formed in the middle of the lens substrate, and the slow-light modulation region is arranged around the central visual region. The slow-light modulation region includes a plurality of photonic crystals, which are arranged in an array and disposed on the lens substrate to reduce the group velocity of light passing through the slow-light modulation region.

2. The optical element for light field manipulation of claim 1, wherein: Includes at least one of the following: The material of the lens substrate is any one of resin, acrylic, PC, MR-8, Trivex, CR-39, and PMMA; Alternatively, the refractive index of the central visual region may be one of 1.50, 1.56, 1.591, 1.60, 1.67, 1.71, 1.74, or 1.

76.

3. The optical element for light field manipulation of claim 1, wherein: Includes at least one of the following, The central visual region can be any one of a circle, an ellipse, or a polygon; The distance between the geometric center of the central visual region and the geometric center of the lens substrate shall not exceed 50 mm; The geometric center of the central visual region and the geometric center of the lens substrate coincide with each other. Alternatively, the maximum span of the central visual area is 1-15mm.

4. The optical element for light field manipulation of claim 1, wherein: The gap between adjacent photonic crystals is 80-350 nm, and the lattice constant of the photonic crystal itself is 80-350 nm.

5. The optical element for light field manipulation of claim 1, wherein: In the radial direction of the lens substrate, an array of photonic crystals is arranged along a predetermined region, and the curvature of the array of photonic crystals is the same as the curvature of the lens substrate in the slow light modulation region.

6. The optical element for light field manipulation of claim 1, wherein: In the radial direction of the lens substrate, the array of photonic crystals is arranged in the form of a wavy surface, a hyperbolic paraboloid, or a plane.

7. The optical element for light field manipulation of claim 1, wherein: Array-shaped photonic crystals can be arranged in single or multiple layers. When array-shaped photonic crystals are arranged in multiple layers, the distance between two adjacent layers is 80-350 nm.

8. The optical element for light field manipulation of claim 1, wherein: The array-shaped photonic crystal is a one-dimensional or two-dimensional photonic crystal, and its lattice constant is calculated using the following formula: Where a is the lattice constant; λ is the center wavelength of the photonic bandgap of the target light; denoted as the average refractive index of the photonic crystal.

9. The optical element for light field manipulation of claim 1, wherein: The array-shaped photonic crystal is a three-dimensional photonic crystal, and its lattice constant is calculated using the following formula: Wherein, a is the lattice constant; λ is the center wavelength of the photonic band gap of the target light, in this embodiment, it can be the wavelength of visible light; is the average refractive index of the photonic crystal.

10. An imaging intervention device, characterized in that: It includes the optical element for controlling the light field as described in any one of claims 1 to 9.

11. The imaging intervention device of claim 10, wherein: The imaging intervention device is eyeglasses, a beam splitter for a distant image screen, or a concave mirror for a distant image screen.

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