Optical element for light field regulation and control, preparation method and imaging intervention device

Abstract

An optical element for light field regulation and control, a preparation method and an imaging intervention device.The optical element comprises a lens base body, the lens base body has a radial direction and a thickness direction perpendicular to the radial direction, and a central vision area and a slow light regulation and control area are formed on the lens base body; the central vision area is formed in the middle of the lens base body, the slow light regulation and control area is arranged outside the central vision area in a surrounding mode and comprises a plurality of photonic crystals, the photonic crystals are arranged in an array mode and arranged on the lens base body, and the slow light regulation and control area is arranged between the central vision area and the slow light regulation and control area. The slow light regulation region is configured to reduce a group velocity of light passing through the slow light regulation region. The optical element can well regulate and control myopia.

Description

Technical Field

[0001] The present invention relates to the technical field of optical components, and in particular to an optical component for light field regulation, a preparation method, and an imaging intervention device. Background Art

[0002] Myopia has become an increasingly serious problem in the global vision health sector. For a long time, the myopia prevention lens market has been dominated by products utilizing microlens defocus technology. This technology utilizes a microlens array within the lens to create a defocused area, thereby slowing the growth of the eye's axial length and thus 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, which cannot effectively control myopia. Summary of the Invention

[0004] The present invention provides an optical element for light field regulation, a preparation method and an imaging intervention device. The optical element can better regulate myopia.

[0005] The present invention provides an optical element for performing light field control, comprising a lens substrate, the lens substrate having a radial direction and a thickness direction perpendicular to the radial direction, a central visual area and a slow light control area formed on the lens substrate, the central visual area being formed in the middle of the lens substrate, the slow light control area being arranged in a circle outside the central visual area, the slow light control area comprising a plurality of photonic crystals, the plurality of photonic crystals being arranged in an array and disposed on the lens substrate to reduce the group velocity of light passing through the slow light control area.

[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 area 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 area is any one of a circle, an ellipse or a polygon.

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

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

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

[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, the array of photonic crystals is arranged along a set area, and the curvature of the array of photonic crystals is the same as the curvature of the lens substrate in the slow light control area.

[0014] Furthermore, in the radial direction of the lens substrate, the arrayed photonic crystals are arranged in a wavy surface, a hyperbolic paraboloid or a plane.

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

[0016] Furthermore, the array-shaped photonic crystal is a one-dimensional photonic crystal or a two-dimensional photonic crystal, and the calculation formula of the lattice constant thereof is:

[0017] Where a is the lattice constant; λ is the photonic band gap center wavelength of the target light; is the average refractive index of the photonic crystal.

[0018] Furthermore, the array of photonic crystals is a three-dimensional photonic crystal, and the calculation formula of the lattice constant thereof is:

[0019] Wherein, a is the lattice constant; λ is the photonic band gap center wavelength of the target light, which can be the wavelength of visible light in this embodiment; is the average refractive index of the photonic crystal.

[0020] Furthermore, on the first surface and / or the second surface of the light field control area, the curvature of the lens substrate is different at different locations.

[0021] The present invention also provides a method for preparing the optical element for light field control, comprising the following steps: S1: providing a lens substrate, and performing cleaning and activation treatment on the lens substrate; S2: importing the distribution data of the arrayed photonic crystals on the lens substrate, and processing the lens substrate with a laser to form the arrayed photonic crystals; S3: Cleaning the lens substrate.

[0022] The present invention also provides an imaging intervention device, comprising the above-mentioned optical element for performing light field regulation.

[0023] Furthermore, the imaging intervention device is glasses, a dichroic mirror of a telescopic screen, or a concave mirror of a telescopic screen.

[0024] In summary, in the present invention, by arranging arrayed photonic crystals in the lens matrix, the arrayed photonic crystals can reduce the group velocity of light at the edge of the photonic band gap through the equivalent medium theory or the photonic band gap effect, which can lead to the extension of the transmission time of light in the lens matrix, forming a time delay.

[0025] When a user views an object through this optical element, part of the light emitted from the observed object enters the user's eyes through the central visual area. This part of the light is normal light and has a normal propagation path. When the other part of the light emitted from the observed object passes through the slow light control area, due to the presence of the array-arranged photonic crystals, the group velocity of the light can be significantly reduced at the edge of the photonic band gap. At this time, the light emitted from the same observed object forms an optical path difference between the central visual area and the slow light control area, resulting in the slow light phenomenon. The two different light signals from the same object can stimulate optic nerve cells such as rods, bipolar cells, and ganglion cells, and then transmit signals to slow the growth of the eye axis through the optic nerve system to the optic nerve, retina, choroid, and sclera in the brain, thereby better regulating myopia.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG2 is a schematic top view of the optical element provided in the first embodiment of the present invention.

[0028] Figure 2 Shown Figure 1 Schematic diagram of the cross-sectional structure of the optical element.

[0029] Figure 3 Shown Figure 1 Schematic diagram of the structure of the photonic crystals arranged in the lens matrix.

[0030] Figure 4 FIG2 is a schematic structural diagram of the arrangement of photonic crystals within a lens matrix in an optical element provided by a second embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0032] The present invention provides an optical element for light field regulation, a preparation method and an imaging intervention device. The optical element can better regulate myopia.

[0033] like Figures 1 to 3 As shown, an optical element provided by an embodiment of the present invention includes a lens substrate 10 having a radial direction and a thickness direction perpendicular to the radial direction. A central visual area 11 and a slow light control area 12 are formed on the lens substrate 10. The central visual area 11 is located in the middle of the lens substrate 10. The slow light control area 12 is circumferentially arranged outside the central visual area 11 along the radial direction of the lens substrate 10. It can be understood that the central visual area 11 is a normal visual area and can have a certain curvature to refract light to a limited extent, or it can be a flat surface.

[0034] The slow light control region 12 includes a plurality of photonic crystals 121 , which are arranged in an array and disposed on the lens substrate 10 to reduce the group velocity of light passing through the slow light control region 12 .

[0035] In this embodiment, by arranging 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 band gap through the equivalent medium theory or the photonic band gap effect, which can cause the transmission time of light in the lens substrate 10 to be extended, resulting in a time delay.

[0036] When a user views an object through the optical element, a portion of the light emitted from the observed object enters the user's eyes through the central visual area 11. This portion of light is normal light and has a normal propagation path. When another portion of the light emitted from the observed object passes through the slow light control area 12, due to the presence of the arrayed photonic crystals 121, the group velocity of the light can be significantly reduced at the edge of the photonic band gap. At this time, the light emitted from the same observed object forms an optical path difference between the central visual area 11 and the slow light control area 12, resulting in a slow light phenomenon. The two different light signals from the same object can stimulate optic nerve cells such as rods, bipolar cells, and ganglion cells, and then transmit signals to slow down the growth of the eye axis through the optic nerve system to the optic nerve, retina, choroid, and sclera in the brain, so as to better regulate myopia.

[0037] In this embodiment, the material of the lens base 10 can be any one of resin, acrylic, PC, MR-8, Trivex, CR-39, and PMMA.

[0038] Furthermore, in this embodiment, the central visual area 11 can be circular, elliptical, or polygonal. The distance between the geometric center of the central visual area 11 and the geometric center of the lens base 10 does not exceed 10 mm. Preferably, the geometric centers of the central visual area 11 and the lens base 10 coincide with each other to ensure the accuracy of the curvature of the central visual area 11. The maximum span of the central visual area 11 is 1-15 mm.

[0039] In the central visual area 11, the refractive index may be one of 1.50, 1.56, 1.591, 1.60, 1.67, 1.71, 1.74, and 1.76.

[0040] Furthermore, in this embodiment, the span of the slow light control area 12 , that is, the distance from the outer edge of the slow light control area 12 to the inner edge of the slow light control area 12 , is 15-75 mm.

[0041] In this embodiment, the photonic crystals 121 of the array can be controlled by their own structures and the gaps between adjacent photonic crystals 121 to hinder the propagation of light, thereby forming a photonic band gap.

[0042] 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.

[0043] In this embodiment, the array of photonic crystals 121 is disposed within the lens substrate 10 and arranged along the radial direction of 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 facing away from the user) and the back surface (i.e., the surface of the lens substrate 10 facing the user) of the lens substrate 10.

[0044] In this embodiment, the arrayed photonic crystal 121 may be a single layer or multiple layers ( Figure 2 shows a structure with two layers), when the array-like photonic crystals 121 are arranged in multiple layers, the distance between two adjacent layers is 80-350 nm.

[0045] In this embodiment, the array of photonic crystals 121 can be arranged along a set curvature in the radial direction of the lens base 10. Preferably, the curvature of the array of photonic crystals 121 is the same as the curvature of the lens base 10 in the slow light control 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.

[0046] More specifically, in this embodiment, the calculation formula for the lattice constant of the two-dimensional photonic crystal is:

[0047] Wherein, a is the lattice constant; λ is the photonic band gap center wavelength of the target light, which in this embodiment can be the wavelength of visible light, such as 400-780 nm; is the average refractive index of the photonic crystal 121 (the average refractive index of the lens substrate 10 and the photonic crystal 121 ).

[0048] This is because the photonic band gap is essentially a periodic structure that constructively interferes with the Bragg radiation of light of a specific wavelength, satisfying the following conditions:

[0049] When light is incident vertically ( θ =90°), which is simplified to

[0050] The calculation of the constants of the above-mentioned one-dimensional photonic crystal or two-dimensional photonic crystal can be explained below based on examples: Example 1: =700 (red light); =1.30 (the refractive index of the substrate is 1.60, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 269nm.

[0051] Example 2: =400 (blue light); =1.33 (the refractive index of the substrate is 1.67, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 150nm.

[0052] Example 3: =550 (green light); =1.28 (the refractive index of the substrate is 1.56, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 215nm.

[0053] Example 4: =595 (yellow light); =1.30 (the refractive index of the substrate is 1.60, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 229nm.

[0054] The wavelength of the light to be adjusted can be determined according to the needs of the user, and then the lattice constant of the photonic crystal 121 can be determined.

[0055] When the photonic crystal 121 is a three-dimensional photonic crystal, the calculation formula of its lattice constant is:

[0056] Wherein, a is the lattice constant; λ is the photonic band gap center wavelength of the target light, which can be the wavelength of visible light in this embodiment; is the average refractive index of the photonic crystal 121 .

[0057] The calculation of the lattice constant of a three-dimensional photonic crystal is described below based on an example.

[0058] Example 5: =700 (red light); =1.3 (the refractive index of the substrate is 1.60, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 311 nm.

[0059] Example 6: =400 (blue light); =1.33 (the refractive index of the substrate is 1.67, and the refractive index of the photonic crystal 121 is 1.0); Then a is approximately 173nm.

[0060] like Figure 4 As shown, in the second embodiment of the present invention, the optical element is substantially the same as the first embodiment, differing from the first embodiment in that, in this embodiment, the array of photonic crystals 121 is arranged in a wavy surface along the radial direction of the lens base 10. It is understood that in other embodiments, the array of photonic crystals 121 may also be arranged in a plane, hyperbolic paraboloid, or other form.

[0061] The present invention also provides a method for preparing the above optical element, which can be prepared on the lens substrate 10 by laser engraving, and specifically includes the following steps: S1: providing a lens substrate 10, and performing cleaning and activation treatment on the lens substrate 10; In this embodiment, during cleaning, the lens substrate 10 can be first immersed in an acetone solution and cleaned using 40kHz ultrasound for 10 minutes; then the acetone solution on the substrate surface is rinsed with deionized water (resistivity ≥ 18MΩ·cm); finally, the substrate is placed in a nitrogen dryer and nitrogen is blown dry with a pressure of 0.3MPa and a temperature of 25°C to dry the surface moisture.

[0062] In this embodiment, when performing the activation process, the lens substrate 10 may be placed in a vacuum chamber (10 -2 Pa), Ar / O2 mixed gas (ratio 8:2) was introduced, and radio frequency plasma (power 300 W, processing time 120 seconds) was started to activate the surface of the lens substrate 10 to enhance the laser absorption rate.

[0063] S2: importing the distribution data of the arrayed photonic crystals 121 on the lens substrate 10 and processing the lens substrate 10 with a laser to form the arrayed photonic crystals 121; In this step, the lens substrate 10 can be fixed first, and then an ultrafast laser processing system can be used to utilize a high-energy-density laser beam (femtosecond, picosecond, nanosecond, etc.) in a point-to-point or continuous irradiation scanning manner, or by directing a single laser beam or interfering / diffracting / scattering multiple laser beams to control the energy / density / size / quantity. The scanning path is automatically generated using the coordinates of the photonic crystal 121, and excess material is accurately removed to form the photonic crystal 121 on the front surface / back surface / inner cavity of the slow light control area 12.

[0064] S3: Cleaning the lens substrate 10.

[0065] The present invention also provides an imaging intervention device, including the above-mentioned optical elements. The imaging intervention device includes but is not limited to glasses, a dichroic mirror of a telescopic screen, a concave mirror of a telescopic screen, etc. For other technical features of the imaging intervention device, please refer to the prior art and will not be repeated here.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make slight changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An optical element for light field control, comprising a lens substrate, wherein the lens substrate has a radial direction and a thickness direction perpendicular to the radial direction, and wherein: A central visual area and a slow light control area are formed on the lens base, wherein the central visual area is formed in the middle of the lens base, and the slow light control area is arranged outside the central visual area. The slow light control area includes a plurality of photonic crystals, and the plurality of photonic crystals are arranged in an array and provided on the lens base to reduce the group velocity of light passing through the slow light control area.

2. The optical element for light field control according to claim 1, wherein: Include 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; Or, the refractive index of the central visual area is one of 1.50, 1.56, 1.591, 1.60, 1.67, 1.71, 1.74, and 1.

76.

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

4. The optical element for light field manipulation according to 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 control according to claim 1, wherein: In the radial direction of the lens substrate, the array of photonic crystals is arranged along a set area, and the curvature of the array of photonic crystals is the same as the curvature of the lens substrate in the slow light control area.

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

7. The optical element for light field control according to claim 1, wherein: The arrayed photonic crystals are arranged in a single layer or multiple layers. When the arrayed 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 according to claim 1, wherein: The array-shaped photonic crystal is a one-dimensional photonic crystal or a two-dimensional photonic crystal, and the calculation formula of the lattice constant thereof is: Where a is the lattice constant; λ is the photonic band gap center wavelength of the target light; is the average refractive index of the photonic crystal.

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

10. A method for preparing the optical element for light field control according to any one of claims 1 to 9, characterized in that: The steps include: S1: providing a lens substrate, and performing cleaning and activation treatment on the lens substrate; S2: importing the distribution data of the arrayed photonic crystals on the lens substrate, and processing the lens substrate with a laser to form the arrayed photonic crystals; S3: Cleaning the lens substrate.

11. An imaging intervention device, characterized in that: An optical element for light field control according to any one of claims 1 to 9.

12. The imaging intervention device according to claim 11, characterized in that: The imaging intervention device is glasses, a dichroic mirror of a telescopic screen or a concave mirror of a telescopic screen.

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