阅读说明：本技术 一种减反射膜、光学元件、摄像头模组和终端 (Antireflection film, optical element, camera module and terminal ) 是由 叶海水 於丰 元军 于 2019-06-18 设计创作，主要内容包括：本申请实施例提供一种减反射膜、光学元件、摄像头模组和终端,涉及光终端领域,以在不受光学元件形状限制的前提下,有效降低光学元件在正入射和斜入射时对光线的反射率,使得光学元件具有极低的反射率。该减反射膜包括形成于光波导包括的至少一个光线透过面的多个凸起结构；每个凸起结构邻近光线透过面的表面最大径向长度小于可见光波长的最小值,每个凸起结构的最大径向长度沿着远离光线透过面的方向逐渐减小,每个凸起结构的高度大于或等于310nm,相邻两个凸起结构邻近光线透过面的表面几何中心之间的距离小于或等于220nm。本申请实施例提供的减反射膜用于终端中。(The embodiment of the application provides an antireflection film, an optical element, a camera module and a terminal, and relates to the field of optical terminals, so that the reflectivity of the optical element to light rays in normal incidence and oblique incidence is effectively reduced on the premise of not being limited by the shape of the optical element, and the optical element has extremely low reflectivity. The antireflection film comprises a plurality of convex structures formed on at least one light transmitting surface of the light guide; the maximum radial length of the surface of each convex structure adjacent to the light transmission surface is smaller than the minimum value of the visible light wavelength, the maximum radial length of each convex structure is gradually reduced along the direction far away from the light transmission surface, the height of each convex structure is larger than or equal to 310nm, and the distance between the geometric centers of the surfaces of two adjacent convex structures adjacent to the light transmission surface is smaller than or equal to 220 nm. The antireflection film provided by the embodiment of the application is used in a terminal.)

1. An antireflection film is characterized by comprising a plurality of convex structures formed on at least one light transmitting surface of an optical waveguide; the maximum radial length of the surface of each convex structure adjacent to the light transmission surface is smaller than the minimum value of the visible light wavelength, the maximum radial length of each convex structure is gradually reduced along the direction far away from the light transmission surface, the height of each convex structure is larger than or equal to 310nm, and the distance between the geometric centers of the surfaces of two adjacent convex structures adjacent to the light transmission surface is smaller than or equal to 220 nm.

2. The antireflection film of claim 1 wherein the height of each of said raised structures is less than or equal to 450nm, and the distance between the geometric centers of the surfaces of two adjacent raised structures adjacent to the light-transmitting surface is greater than or equal to 160 nm.

3. The antireflection film of claim 1 wherein the maximum radial length of the surface of each of said raised structures remote from the light transmitting surface is from 0 to 0.3 times the maximum radial length of the surface of the corresponding raised structure adjacent to the light transmitting surface.

4. The antireflection film of claim 1 wherein the ratio of the height of each of the raised structures to the maximum radial length of the surface of the corresponding raised structure adjacent to the light transmitting surface is greater than or equal to 1 to 3.

5. The antireflection film according to any one of claims 1 to 4, wherein the plurality of convex structures are distributed in a close-packed distribution.

6. The antireflection film as claimed in any one of claims 1 to 5, wherein the maximum radial length of the surface of each of the convex structures adjacent to the light transmission surface is equal to the distance between the geometric centers of the surfaces of two adjacent convex structures adjacent to the light transmission surface.

7. The antireflection film according to any one of claims 1 to 6, further comprising an adhesive layer, wherein the adhesive layer is located on a surface of the plurality of protruding structures close to the light transmission surface, and a height of the adhesive layer is less than or equal to 10 nm.

8. The antireflection film of claim 7 wherein a difference between a refractive index of a material contained in the adhesive layer and a refractive index of a material contained in each of the projection structures is-0.2 to 0.2.

9. The antireflection film of claim 7 or 8 wherein the total light transmission of the bonding layer and/or the total light transmission of each of the raised structures is greater than 90%.

10. An optical element comprising an optical waveguide and the antireflection film according to any one of claims 1 to 8, wherein the antireflection film is provided on at least one light-transmitting surface included in the optical waveguide.

11. The optical element according to claim 10, wherein a difference between a refractive index of a material contained in each of the convex structures and a refractive index of a material contained in the optical waveguide is-0.2 to 0.2.

12. The optical element according to claim 10 or 11, wherein the antireflection film is the antireflection film according to claim 7 or 8, and the antireflection film includes a difference between a refractive index of a material contained in the adhesive layer and a refractive index of a material contained in the optical waveguide of-0.2 to 0.2.

13. An optical element as recited in any one of claims 10 to 11, wherein the maximum reflectance of the optical element at an incident angle of 0 ° is 0.5% or less, and the maximum reflectance of the optical element at an incident angle of more than 0 ° and 40 ° is 1% or less.

14. The optical element according to any one of claims 10 to 13, wherein the total light transmittance of the optical waveguide and/or the total light transmittance of the antireflection film is greater than 90%.

15. The optical element according to any one of claims 10 to 14, wherein the light transmitting surface on which the plurality of convex structures are formed is a curved light transmitting surface or a planar light transmitting surface.

16. An optical element according to any one of claims 10 to 14, wherein the optical waveguide is a protective window, a lens or an infrared cut filter.

17. A camera module comprising at least one optical element according to any one of claims 10 to 16.

18. The camera module of claim 17, further comprising an image sensor, wherein the optical element is positioned in a direction of a sensing surface of the image sensor.

19. A terminal comprising a processor and the camera module of claim 17 or 18.