Fresnel lens film and optical waveguide lens for vision correction

Abstract

The utility model relates to a Fresnel lens film and an optical waveguide lens for vision correction, the Fresnel lens film comprises an adhesion layer, a film substrate layer and a Fresnel lens layer which are sequentially connected along the thickness direction, the film substrate layer is sequentially divided into a near interpupillary distance section, a middle interpupillary distance section and a far interpupillary distance section along the length direction, the Fresnel lens layer is arranged on the middle interpupillary distance section; the optical waveguide lens comprises a waveguide sheet, a protection layer and the Fresnel lens film which are sequentially connected along the light emitting direction, and the adhesion layer is arranged on the protection layer. The Fresnel lens film is used for being adhered to the side, close to the human eyes, of the AR glasses, vision correction can be conducted according to the imaging position and the pupil distance, and the Fresnel lens film has the advantages of being light and thin in material, convenient to disassemble and assemble, low in price and good in mechanical performance.

Description

Technical Field

[0001] The utility model relates to the technical field of near-eye display equipment, in particular to a Fresnel lens film and an optical waveguide lens for vision correction. Background Art

[0002] As the hottest virtual sensory interaction technologies, augmented reality (AR) and virtual reality (VR) have gradually penetrated into the entertainment, education, medical and other industries. Currently, the main platform device for realizing AR / VR technology is near-eye display (NED). NED is a glass or goggle-type wearable display device, which consists of a micro display panel and imaging optics. The light emitted by the micro display panel close to the eye is collimated by the imaging optics to form a virtual image at a long distance where the eye can focus comfortably. As a wearable device close to the eye, NED also needs to be easy to wear, light, with a wide field of view and a large eye movement range. In NED display, the optical matching of virtual images and real objects is very important for the natural interaction between the image and the user. However, conventional AR / VR lenses are designed for people with normal refraction and do not take into account the degree of myopia / hyperopia that needs to be corrected. Therefore, it is inconvenient for people who need to wear glasses for vision correction, which in turn hinders the promotion and application of NED.

[0003] The Chinese patent with the authorization announcement number CN106662759B discloses a prescription lens for smart glasses, which allows the wearer to clearly see the displayed image and the surrounding environment by simply bonding the smart glasses and the prescription lenses through gluing, snapping, magnetic attraction, etc. Since the existing AR lenses are usually flat optical waveguides without degrees, and the two sides are bonded with glass cover layers for protection, it is naturally impossible to add correction degrees such as myopia / hyperopia / astigmatism. The current general solution is that AR glasses manufacturers cooperate with eyeglass lens manufacturers to add prescription lenses on the far side of the glass cover layer after the user's eyesight test and glasses fitting.

[0004] The shortcomings of the above-mentioned prior art are: (1) the weight of the combination of smart glasses and prescription lenses is relatively large, which affects the user's wearing experience, and the prescription lenses are easily dropped and broken due to their own weight; (2) smart glasses and prescription lenses are bound together, and it is impossible to selectively use smart glasses, prescription lenses, and combination glasses according to applicable occasions; (3) after the near-eye display device is updated, if the user wants to replace the device, he can only go through an eye test and glasses fitting again, and this process needs to be completed in a special eyewear store, which is time-consuming and labor-intensive, and the price of glasses fitting ranges from hundreds to thousands of yuan, which in turn hinders the promotion and application of NED.

[0005] The Chinese patent with the authorization announcement number CN220019993U discloses a near-eye display module and a near-eye display device, which uses a holographic waveguide as an optical module. The holographic waveguide uses an ultra-thin photosensitive polymer film to replace the prism in the traditional waveguide lens to guide the image light into the human eye to reduce the thickness of the optical module, and inserts and fixes the Fresnel lens between the eyeglass frame and the optical module on the far side of the human eye to achieve the effect of vision correction. Although this method reduces the overall weight of the AR lens, it is not suitable for reducing the weight and thinning of the diffraction optical waveguide, and there are still problems such as difficulty in manufacturing, difficulty in replacing the Fresnel lens, and high price.

[0006] The Chinese patent with the authorization announcement number CN105759424B discloses a head-mounted virtual reality optical system that uses Fresnel lenses to adjust the diopter. It is based on the optical path requirements of traditional VR glasses - to use a combination of multiple lenses. Using Fresnel lenses to reduce the overall weight is a very popular solution. Products such as PSVR2, Meta quest 2, and PICO neo3 all use Fresnel lenses to replace ordinary lenses. The structure of the inherent Fresnel lenses in the optical path is changed to match the user's vision correction degree. Although both AR and VR need to be realized through near-eye display devices, because the Fresnel lens is bound to the VR optical path and because the Fresnel lens cannot be prefabricated in the AR optical path, the vision correction solution of the above VR glasses cannot be simply analogized to the AR solution, and there are also problems such as the difficulty of replacing Fresnel lenses and high prices. Summary of the invention

[0007] In view of the shortcomings of the prior art, the first purpose of the utility model is to provide a Fresnel lens film for vision correction, which is used to adhere to the side of AR glasses close to the human eye and can correct vision according to the imaging position and pupil distance. It has the advantages of light and thin material, easy disassembly and assembly, low price and good mechanical properties.

[0008] The second object of the utility model is to provide an optical waveguide lens, which has the advantages of being suitable for users with ametropia and facilitating the promotion and application of AR glasses.

[0009] In order to achieve the above first purpose, the utility model provides the following technical solutions:

[0010] A Fresnel lens film for vision correction comprises an adhesive layer, a film substrate layer and a Fresnel lens layer which are sequentially connected along the thickness direction; the film substrate layer is sequentially divided into a near pupil distance section, an intermediate pupil distance section and a far pupil distance section along the length direction; the Fresnel lens layer is arranged on the intermediate pupil distance section.

[0011] By adopting the above technical solution, compared with the method of fixing the prescription lens on the far side of the AR glasses, inserting the Fresnel lens between the frame and the holographic waveguide on the far side of the AR glasses, or adjusting the size of the Fresnel lens in the VR optical path, the utility model can detachably connect the Fresnel lens film to the near side of the AR glasses through the adhesive layer to achieve the purpose of vision correction; wherein,

[0012] The thickness of the Fresnel lens film is at the level of hundreds of μm, which is similar to the thickness of ordinary mobile phone films. It can be much thinner than the thickness of ordinary lenses, achieving the same focusing effect as ordinary plano-convex / plano-concave lenses, and has almost no impact on the image quality.

[0013] The flexible material and adhesive properties of the Fresnel lens film allow users to purchase multiple sheets at a time according to their vision and stick them on the side of the AR glasses close to the human eye. The parallel light emitted from the waveguide remains parallel light after passing through the protective layer, and then focuses or diverges after passing through the Fresnel lens film to adapt to the user's correction degree. If replacement is required, the Fresnel lens film can be peeled off and replaced with a new one.

[0014] Fresnel lens film is easy to design according to the user's degree. The convex structure and size of the Fresnel lens are different for different correction degrees of users, and need to be designed according to the predetermined calculation rules. However, once it is pre-designed for fixed degrees such as ±50 / 100 / 150 / … / 1000 degrees, it can be mass-produced;

[0015] AR glasses are designed to be universal for all pupil distances, that is, within the display area of ​​the optical waveguide lens, users can see images regardless of the pupil distance. However, different pupil distances will cause the position of the human eye focus on the focal plane to change, and the corresponding prescription lenses are configured differently. Therefore, people with different pupil distances often cannot use each other's prescription lenses even if they have the same glasses. The Fresnel lens film of the utility model manufactures the Fresnel lens layer at the center of a larger film, and cuts the near pupil distance segment and / or the far pupil distance segment to match the pupil distance according to the pupil distance information provided by the customer.

[0016] Specifically, in the Fresnel lens film of the present invention,

[0017] The specific meaning of the "adhesion layer" is a structure that can adhere the Fresnel lens film to the side of the optical waveguide lens near the human eye by bonding, chemical adsorption, magnetic adsorption, electrostatic adsorption, and / or vacuum adsorption, and can be, for example, a hot melt adhesive sheet, a thermoplastic glue coating, a resin adhesive layer, a chemical medium coating, a light-curing resin coating, an electrostatic adsorption layer, and / or a vacuum suction cup, etc.;

[0018] The “film substrate layer” specifically refers to a transparent sheet made of plastic, adhesive, rubber or other materials, and may be, for example, an optical film, a composite film, a superconducting film, a polyester film, a nylon film, and / or a plastic film, etc. without limitation;

[0019] The specific meaning of the "Fresnel lens layer" refers to a threaded lens formed by injection molding of an embossed material, wherein the surface on one side close to the film substrate layer is approximately a smooth plane, and the surface on the other side is embossed to form a concentric circle structure to complete the adjustment of the light, and can be, for example, a positive Fresnel lens or a negative Fresnel lens without limitation; in terms of material, it can be a thermosetting resin or a photocurable resin, and the Fresnel lens layer can be, for example, a non-limiting one or a combination of several of polymethyl methacrylate (PMMA), polycarbonate (PC), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyamide (PA), and polystyrene (PS).

[0020] Furthermore, the thickness of the Fresnel lens film is 100-500 μm; wherein the thickness of the film substrate layer is 100-300 μm, and the thickness of the Fresnel lens layer does not exceed 1 μm.

[0021] Furthermore, the Fresnel lens layer includes a plurality of annular units arranged in a concentric array, each annular unit includes a plurality of pixel rings arranged in a concentric array, the connecting line between the top surfaces of the plurality of pixel rings is arc-shaped, so that the top surface of the annular unit is approximately an annular curved surface, and the curvature radius of the annular curved surface of the plurality of annular units is set in one-to-one correspondence with the predetermined curvature radius for vision correction.

[0022] Furthermore, the plurality of annular units are arranged to be spaced apart from each other along the radial direction, and / or are arranged to be connected to each other along the radial direction.

[0023] Furthermore, the plurality of pixel rings are arranged to be spaced apart from each other along a radial direction, and / or are arranged to be connected to each other along a radial direction.

[0024] Furthermore, the thickness of the pixel ring does not exceed 1 μm, and the width does not exceed 1 μm.

[0025] Furthermore, the cross section of the pixel ring is rectangular.

[0026] In order to simplify the vision correction design method of the Fresnel lens layer, the utility model first determines the predetermined curvature radius of the concave lens or convex lens used for vision correction based on the spherical coefficient and the aspherical coefficient, and then divides the lens into pixel blocks, namely the subsequent annular unit area, and then divides the pixel ring into pixel points, namely the subsequent pixel ring area; if the lens thickness does not exceed 1μm at the position of this pixel point, the height of the pixel ring is designed according to the current lens thickness; if h exceeds 1μm, the height of the pixel ring is designed on the basis of subtracting an integer multiple of 1μm to ensure that the thickness of the cover annular unit is between 0 and 1μm, thereby dividing to form a Fresnel lens layer, which is simple and easy to process.

[0027] Furthermore, the preparation process of the Fresnel lens film includes:

[0028] S1 plate making, firstly laser processing is performed on the surface of the mask plate to form a pattern area identical to the surface of the Fresnel lens layer, then electroplating is continued on the mask plate to form a nickel layer in the non-pattern area, and the nickel layer can be embedded with the surface of the Fresnel lens layer to obtain a master plate;

[0029] S2 coating, firstly compounding the adhesive layer and the film substrate layer to obtain a base film, and then continuously passing the base film through a coating device to evenly coat a thermosetting resin or a light-curing resin on the surface of the film substrate layer away from the adhesive layer to obtain a resin layer;

[0030] S3 transfer printing, first wrapping the master obtained in S1 on a plate roller, then passing the base film obtained in S2 through the master on the plate roller, so as to form a pattern area on the surface of the resin layer that is the same as the surface of the Fresnel lens layer, and then thermally curing or light curing to obtain the Fresnel lens layer;

[0031] S4 cutting to obtain the Fresnel lens film.

[0032] In this process, the base film is placed between two support rollers, and a plate roller is placed in the middle. The gluing process is completed before the film enters the plate roller. After the master plate on the plate roller is imprinted, the imprinted structure is cured by processes such as heat curing or light curing to obtain the corresponding structure. The advantage of this method is that the master plate rolls periodically on the plate roller and can be manufactured continuously and uninterruptedly, so the cost is very low. It is possible to reduce the manufacturing cost of each Fresnel lens film to a level comparable to that of a mobile phone film, which is much lower than ordinary myopia / hyperopia prescription lenses. This advantage complements the advantage of "replaceability" - when the cost of myopia / hyperopia lenses is very low, users can replace and transfer AR glasses without any burden, paving the way for the promotion of AR glasses.

[0033] In order to achieve the above second purpose, the utility model provides the following technical solutions:

[0034] An optical waveguide lens comprises a waveguide sheet, a protective layer and the above-mentioned Fresnel lens film which are sequentially connected along the light emitting direction, wherein the adhesive layer is arranged on the protective layer.

[0035] In summary, the beneficial technical effects of the utility model are:

[0036] 1. A combined lens structure of AR glasses suitable for people with myopia / hyperopia or other vision correction is proposed, and a roll-to-roll processing method is provided. For people with corrected vision, there is no need for bulky and expensive AR glasses + myopia / hyperopia / astigmatism lens combination, but only a lightweight and cheap Fresnel lens film can be attached to the near-eye side of the AR glasses, which is easy to install and replace. The Fresnel lens film is processed using a roll-to-roll method, which greatly reduces the cost;

[0037] 2. The thickness of the Fresnel lens film is in the hundreds of μm (100~500μm) level, and can be made of resin, plastic and other materials. Pre-design and manufacture of large quantities of fixed myopia / hyperopia / astigmatism lenses for users to choose and purchase;

[0038] 3. Unlike the Fresnel lens in the VR field, this Fresnel lens is not prefabricated in the AR optical waveguide and lens, and is not a necessary component of the optical path. Instead, it is manufactured in the form of a film for users to purchase and attach to the near-eye side of the outer glass cover layer of the AR optical waveguide according to their own characteristics.

[0039] 4. Manufacture large-sized Fresnel lens films and cut them differently to match the pupil distance of users with different pupil distances;

[0040] 5. The roll-to-roll method is used to manufacture Fresnel lens film, which greatly reduces its cost, reduces the difficulty of manufacturing and application, reduces the product price, and is more conducive to product promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic cross-sectional structure diagram of the Fresnel lens film of Example 1 of the utility model.

[0042] Figure 2 It is a schematic diagram of the connection relationship between the film substrate layer and the Fresnel lens layer of Example 1 of the utility model.

[0043] Figure 3 It is a schematic diagram of the partial structure of the Fresnel lens layer of Example 2 of the utility model.

[0044] Figure 4 It is a schematic cross-sectional structure diagram of the Fresnel lens layer of Example 2 of the utility model.

[0045] Figure 5This is a flow chart of preparing a Fresnel lens film according to Example 3 of the utility model.

[0046] Figure 6 It is a schematic structural diagram of the optical waveguide lens of Example 4 of the utility model.

[0047] In the figure, 1, adhesion layer; 2, thin film substrate layer; 3, Fresnel lens layer; 31, annular unit; 311, pixel ring; 4, waveguide plate; 5, protective layer. DETAILED DESCRIPTION

[0048] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Example 1: Reference Figure 1 and Figure 2 , a Fresnel lens film for vision correction disclosed in the utility model, comprising an adhesive layer 1, a film substrate layer 2 and a Fresnel lens layer 3 connected in sequence along the thickness direction, which is used to adhere to the side of AR glasses near the human eye and can correct vision according to the imaging position and pupil distance, and has the advantages of light and thin material, easy disassembly and assembly, low price and good mechanical properties. Preferably, the following structure is adopted:

[0050] The adhesive layer 1 is a resin adhesive layer, which can be attached to the side of the AR glasses close to the human eye by bonding and fixing;

[0051] The film substrate layer 2 is a transparent optical film, which is divided into a near pupil distance section, a middle pupil distance section and a far pupil distance section in sequence along the length direction, and the Fresnel lens layer 3 is arranged on the middle pupil distance section;

[0052] The Fresnel lens layer 3 is a spiral lens formed by injection molding of polymethyl methacrylate, the surface of which is close to the film substrate layer 2 and is approximately a smooth plane, and the surface of the other side is embossed to form a concentric circle structure, and has multiple curvature radii corresponding to the predetermined curvature radius for vision correction, so as to complete the adjustment of light;

[0053] In addition, the thickness of the Fresnel lens film is 500 μm, wherein the thickness of the film substrate layer 2 is 300 μm, and the thickness of the Fresnel lens layer 3 does not exceed 1 μm.

[0054] Compared with the method of fixing the prescription lens on the far side of the AR glasses, inserting the Fresnel lens between the frame and the holographic waveguide on the far side of the AR glasses, or adjusting the size of the Fresnel lens in the VR optical path, the utility model can detachably connect the Fresnel lens film to the near side of the AR glasses through the adhesive layer 1 to achieve the purpose of vision correction; wherein,

[0055] The thickness of the Fresnel lens film is at the level of hundreds of μm, which is similar to the thickness of ordinary mobile phone films. It can be much thinner than the thickness of ordinary lenses, achieving the same focusing effect as ordinary plano-convex / plano-concave lenses, and has almost no impact on the image quality.

[0056] The flexible material and adhesive properties of the Fresnel lens film allow users to purchase multiple sheets at a time according to their vision and stick them on the side of the AR glasses near the human eye. The parallel light emitted from the waveguide sheet 4 remains parallel light after passing through the protective layer 5, and then focuses or diverges after passing through the Fresnel lens film to adapt to the user's correction degree. If replacement is required, the Fresnel lens film can be peeled off and replaced with a new Fresnel lens film.

[0057] Fresnel lens film is easy to design according to the user's degree. The convex structure and size of the Fresnel lens are different for different correction degrees of users, and need to be designed according to the predetermined calculation rules. However, once it is pre-designed for fixed degrees such as ±50 / 100 / 150 / … / 1000 degrees, it can be mass-produced;

[0058] AR glasses are designed to be universal for all pupil distances, that is, in the display area of ​​the optical waveguide lens, users can see images regardless of the pupil distance. However, different pupil distances will cause the position of the human eye focus on the focal plane to change, and the corresponding prescription lenses are configured differently. Therefore, people with different pupil distances often cannot use each other's prescription lenses even if the glasses have the same degree. The Fresnel lens film of the utility model manufactures the Fresnel lens layer 3 at the center of a larger film, and cuts the near pupil distance segment and / or the far pupil distance segment to match the pupil distance according to the pupil distance information provided by the customer.

[0059] Example 2: Reference Figure 3 and Figure 4 , is a Fresnel lens film for vision correction disclosed by the utility model, which is different from Example 1 in that the Fresnel lens layer 3 includes a plurality of annular units 31 arranged in a concentric array and spaced from each other along the radial direction, each annular unit 31 includes a plurality of pixel rings 311 arranged in a concentric array and connected to each other along the radial direction, and the connecting line between the top surfaces of the plurality of pixel rings 311 is arc-shaped, so that the top surface of the annular unit 31 is approximately an annular curved surface, and the curvature radius of the annular curved surface of the plurality of annular units 31 is set in one-to-one correspondence with the predetermined curvature radius for vision correction. Among them, the thickness of the pixel ring 311 does not exceed 1μm, the width does not exceed 1μm, and the cross section of the pixel ring 311 is rectangular.

[0060] Taking the Fresnel lens film used for 500-degree myopia correction as an example, the area of ​​the Fresnel lens film is 15mm×15mm, the focus is at the center of the picture, the human eye is located behind the focus, and the distance between the two lenses is determined according to the pupil distance of the human eye. The Fresnel lens film is composed of rectangular pixel rings 311 of different thicknesses formed on a 300μm thick film, and the thickness of the pixel ring 311 does not exceed 1μm. Figure 3 In the graph, black is the low point, whiter the better, and the highest is 1μm. Figure 4 Schematic diagram of the structure of the annular unit 31 on the surface of the Fresnel lens film. Each annular unit 31 is composed of a rectangular pixel ring 311, and the width does not exceed 1 μm, but each annular unit 31 occupies more than one pixel. Figure 3 The central black area is at the millimeter level, with thousands of pixels in both the horizontal and vertical directions, and the vertical height is between 0 and 1 μm.

[0061] Example 3: Reference Figure 5 , is a Fresnel lens film for vision correction disclosed in the utility model, which is different from Example 2 in that the preparation process of the Fresnel lens film includes:

[0062] S1 plate making, firstly laser processing is performed on the surface of the mask plate to form a pattern area identical to the surface of the Fresnel lens layer 3, then electroplating is continued on the mask plate to form a nickel layer in the non-pattern area, and the nickel layer can be embedded with the surface of the Fresnel lens layer 3 to obtain a master plate;

[0063] S2 coating, firstly compounding the adhesive layer 1 and the film substrate layer 2 to obtain a base film, and then continuously passing the base film through a coating device to evenly coat polymethyl methacrylate on the surface of the film substrate layer 2 facing away from the adhesive layer 1 to obtain a resin layer;

[0064] S3 transfer printing, firstly wrapping the master obtained in S1 on a plate roller, then passing the base film obtained in S2 through the master on the plate roller, so as to form a pattern area on the surface of the resin layer that is the same as the surface of the Fresnel lens layer 3, and then photocuring to obtain the Fresnel lens layer 3;

[0065] S4 cutting to obtain the Fresnel lens film.

[0066] In this process, the base film is placed between two support rollers, and a plate roller is placed in the middle. The gluing process is completed before the film enters the plate roller. After the master plate on the plate roller is imprinted, the imprinted structure is cured by processes such as heat curing or light curing to obtain the corresponding structure. The advantage of this method is that the master plate rolls periodically on the plate roller and can be manufactured continuously and uninterruptedly, so the cost is very low. It is possible to reduce the manufacturing cost of each Fresnel lens film to a level comparable to that of a mobile phone film, which is much lower than ordinary myopia / hyperopia prescription lenses. This advantage complements the advantage of "replaceability" - when the cost of myopia / hyperopia lenses is very low, users can replace and transfer AR glasses without any burden, paving the way for the promotion of AR glasses.

[0067] Example 4: Reference Figure 6 , is an optical waveguide lens disclosed in the utility model, which is different from Example 3 in that it includes a waveguide plate 4, a protective layer 5 and the above-mentioned Fresnel lens film connected in sequence along the light emitting direction, and the adhesive layer 1 is arranged on the protective layer 5.

[0068] Example 5: The performance of the optical waveguide lens of Example 4 was tested, and the test results are shown in Table 1.

[0069] 1. Use back-illuminated light sources to assist human eyes in observing surface defects of waveguides and protective layers;

[0070] 2. Measure the transmission, reflection and scattering of the optical waveguide lens by using a spectrophotometer and a haze meter;

[0071] 3. Test the imaging quality of the optical waveguide lens (including but not limited to clarity, distortion, brightness and color uniformity, stray light, etc.) by using an imaging brightness colorimeter or the like;

[0072] 4. Use the pupil distance ruler to detect the difference between the actual pupil distance and the nominal pupil distance of the optical waveguide lens after bonding;

[0073] 5. Use 0.01 sensitivity to test whether the vertex power of the optical waveguide lens meets the national standards;

[0074] 6. After marking the center, check the horizontal and vertical differences of the optical center of the optical waveguide lens;

[0075] 7. Check if there are any gaps or looseness in the lenses after they are fitted.

[0076] Table 1

[0077] Surface defects Transmission, reflection, and scattering Image quality The difference between actual pupil distance and nominal pupil distance Vertex Optical center horizontal and vertical difference There are no gaps or looseness after the lenses are fitted Example 4 Sample 1 There are 3 scratches larger than 1mm in the non-imaging area Transmittance 92% @550nm No ghosting 0.1mm -5.0D 0 none Example 4 Sample 2 There is a scratch larger than 1 mm in the non-imaging area Transmittance 92% @550nm No ghosting -0.05mm -5.0D 0.1mm none

[0078] As can be seen from Table 1, the original vertex power of the waveguide lens is 0.0D, and after being bonded with the thin film Fresnel lens, the vertex power is successfully changed to -5.0D, that is, it is suitable for people with 500-degree myopia. The difference between the pupil distance and the actual pupil distance after bonding does not exceed 0.1mm, the optical center difference is small, and there is no ghost, which meets the design requirements. Among them, the horizontal and vertical differences and assembly conditions of the optical center are measured according to the national standard GB10810.1-2005, and the vertex power is measured according to the national standard GB17341-1998. In addition, the vertex power of the waveguide lens corresponds to the refractive power of the eye. For example, a pair of glasses with a vertex power of -5.0D is adapted to a human eye with a refractive power of -5.0D, which is commonly known as 500-degree myopia. If special conditions such as astigmatism need to be adapted, it should also comply with the national standard GB17341-1998, and measurement items such as "cylindrical power" can be added.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A Fresnel lens film for vision correction, characterized in that: The invention comprises an adhesive layer (1), a film substrate layer (2) and a Fresnel lens layer (3) which are sequentially connected along the thickness direction; the film substrate layer (2) is sequentially divided into a near pupil distance section, an intermediate pupil distance section and a far pupil distance section along the length direction; and the Fresnel lens layer (3) is arranged on the intermediate pupil distance section.

2. The Fresnel lens film for vision correction according to claim 1, characterized in that: The adhesive layer (1) is a hot-melt adhesive sheet, a thermoplastic glue coating, a resin adhesive layer, a chemical medium coating, a light-curing resin coating, an electrostatic adsorption layer, and / or a vacuum suction cup.

3. The Fresnel lens film for vision correction according to claim 1, characterized in that: The film substrate layer (2) is an optical film, a composite film, a superconducting film, a polyester film, a nylon film, and / or a plastic film.

4. The Fresnel lens film for vision correction according to claim 1, characterized in that: The Fresnel lens layer (3) is composed of a thermosetting resin or a light-curing resin.

5. The Fresnel lens film for vision correction according to claim 1, characterized in that: The Fresnel lens layer (3) is composed of polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyethylene terephthalate, polyamide, and / or polystyrene.

6. The Fresnel lens film for vision correction according to claim 1, characterized in that: The thickness of the Fresnel lens film is 100-500 μm; wherein the thickness of the film substrate layer (2) is 100-300 μm, and the thickness of the Fresnel lens layer (3) does not exceed 1 μm.

7. The Fresnel lens film for vision correction according to claim 1, characterized in that: The Fresnel lens layer (3) comprises a plurality of annular units (31) arranged in a concentric array, each annular unit (31) comprises a plurality of pixel rings (311) arranged in a concentric array, the connection line between the top surfaces of the plurality of pixel rings (311) is in an arc shape, so that the top surface of the annular unit (31) is approximately an annular curved surface, and the curvature radius of the annular curved surface of the plurality of annular units (31) is set in one-to-one correspondence with a predetermined curvature radius for vision correction.

8. The Fresnel lens film for vision correction according to claim 7, characterized in that: The cross section of the pixel ring (311) is rectangular.

9. An optical waveguide lens, characterized in that: It comprises a waveguide sheet (4), a protective layer (5) and a Fresnel lens film according to any one of claims 1 to 8, which are sequentially connected along the light emitting direction, and the adhesive layer (1) is arranged on the protective layer (5).

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