Patent Publication Number: US-2019170910-A1

Title: Lightweight spectacle lens

Description:
FIELD 
     The subject matter herein generally relates to optical aids, and to a lens for spectacles. 
     BACKGROUND 
     People with poor eyesight can wear glasses or contact lenses to see clearly. Contact lenses are convenient. However, human eyes will feel dry when contact lenses are worn for a long time, which can cause red-eye. Non-contact glass lenses are convenient, but are easily to crack and be scratched. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is a cross-sectional view of a spectacle lens in accordance with one exemplary embodiment. 
         FIG. 2  is a cross-sectional view of a spectacle lens in accordance with one exemplary embodiment. 
         FIG. 3  is a cross-sectional view of a spectacle lens in accordance with one exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale, and the proportions of certain parts may be exaggerated to illustrate details and features of the present disclosure better. The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.” 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. The references “a plurality of” and “a number of” mean “at least two.” 
     Example 1 
       FIG. 1  illustrates a lightweight spectacle lens  100  according to one embodiment. The spectacle lens  100  includes a lens main body  10  and a functional film  20  formed on at least one surfaces of the lens main body  10 . A main material of the lens main body is cyclic block copolymer (CBC). This material allows the spectacle lens  100  to have lightweight performance. 
     In the illustrated embodiment, and the lens main body  10  includes a front surface  101  and a rear surface  102  opposite to the front surface  101 , and the functional film  20  formed on both the front surface  101  and the rear surface  102 . 
     The front surface  101  is a spherical surface, a non spherical surface, or a progressive surface, and the back surface  102  is a spherical surface, an aspheric surface, or a progressive surface. 
     The functional film  20  is select from a group consisting of a rigid film, an anti-smear film (to reduce fingerprints), an anti fogging film, a color film, a waterproof self cleaning film, an anti ultraviolet film and an anti reflection film or any combination thereof. That is, a rigid film, an anti-smear film, an anti fogging film, a color film, a waterproof self cleaning film, an anti ultraviolet film and an anti reflection film can successively formed on one surface of the lens main body  10  according to the functional requirements. 
     In the illustrated embodiment, the functional film  20  is a single rigid film. The rigid film has a high surface hardness and a strong adhesive strength. A high surface hardness means a high scratch resistance, and the rigid film protects the lightweight spectacle lens  100  from scratches. The rigid film is composed of a dopamine, a plurality of inorganic oxide particles, and a solvent. The rigid film is formed by coating a mixture of a dopamine, and a plurality of inorganic oxide particles on surfaces of the spectacle lens  100 . 
     The dopamine has a mass percentage of about 1% to about 40% of a total mass of the hard coating composition, the plurality of the inorganic oxide particles has a mass percentage of about 40% to about 80% of the total mass of the hard coating composition. The solvent has a mass percentage of about 5% to about 50% of the total mass of the hard coating composition. 
     The plurality of inorganic oxide particles is selected from particles of silica, zirconia, alumina, titanium, or any combination thereof. Particle diameter of the inorganic oxide particle is about 1 nm to about 1000 nm. 
     The solvent is water, an alcohol aqueous solution, or an oxidizing aqueous solution. The alcohol aqueous solution is a methanol aqueous solution, an ethanol aqueous solution, or a propanol aqueous solution, and the oxidizing aqueous solution is sodium periodate aqueous solution. 
     In a preferred embodiment, an ultraviolet absorbers is doped with the circular block copolymers to form an anti-ultraviolet glasses, and a weight ratio of the ultraviolet absorbers in a total weight of the circular block copolymers and the ultraviolet absorbers is 0.0003% and 5.8%. This allows the spectacle lens  100  to have strong ultraviolet-blocking property, lower risk of breaking, and better shock resistance. 
     The spectacle lens can be single focus, bi-focus, or multi-focus lens. 
     The spectacle lenses can be employed as corrective lens, such as myopia lens, hypermetropia lenses, presbyopic lens, or progressive lens. 
     Example 2 
       FIG. 2  illustrates a lightweight spectacle lens  200  according to one embodiment. The lightweight spectacle lens  200  in  FIG. 2  is similar to the lightweight spectacle lens  100  in  FIG. 1 . The difference between the lightweight spectacle lens  200  and the lightweight spectacle lens  100  in  FIG. 1  is that the functional film includes an anti reflection film  201 , the an anti reflection film  201  includes a plurality of micro-structures  301  spacing apart, and the size of the microstructure  301  is in nanometer magnitude. 
     In the illustrated embodiment, as shown in  FIG. 2 , a section of the microstructure  202  is triangular. A height of the microstructure is in a range from 40 nm to 550 nm, a width of the microstructure is in a range from 35 nm to 555 nm, a period of the microstructures is in a range from 10 nm to 650 nm. The scale of microstructure is no greater than the wavelength of light. 
     When the scale of the microstructure  301  is no larger than the wavelength of light, refraction of light wave will present a continuous change on the surface of the microstructure (graded index of gradual index of refraction), and this continuous change can achieve the anti reflection characteristics and increase the absorption of optical structure to light. Thereby, the microstructure  301  absorb light from all directions. And because the surface of the anti-reflection film  201  is microstructure  301 , and the lightweight spectacle lens  200  has super-hydrophobicity and self-cleaning property, similarly to the lotus effect. The anti reflection film  201  is formed on surfaces of the lens main body  10  by a sol-gel method. 
       FIG. 3  illustrates a lightweight spectacle lens  300  according to one embodiment. The lightweight spectacle lens  300  in  FIG. 3  is similar to the lightweight spectacle lens  200  in  FIG. 2 . The difference between the lightweight spectacle lens  300  and the lightweight spectacle lens  200  in  FIG. 2  is that the a section of the microstructure  302  is semicircle. 
     The embodiments shown and described above are only examples. Therefore, many commonly-known features and details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims. It will, therefore, be appreciated that the embodiments described above may be modified within the scope of the claims.