Lens-increasing lens convenient to repair and preparation method thereof

Abstract

The invention relates to a lens-increasing lens convenient to repair and a preparation method thereof. The lens-increasing lens comprises a lens substrate, a silver layer plated on the outer side surface of the lens substrate and having a thickness of 2-4 nm, and an antireflection film layer plated on the outer side surface of the silver layer. The lens substrate is glass with the refractive indexranging from 1.46 to 2.1 or a crystal with the refractive index ranging from 1.38 to 2.4. The antireflection film layer comprises a first H4 film layer with the thickness of 25.1-28.7 nm, a first MgF2 film layer with the thickness of 35.4-33.2 nm, a second H4 film layer with the thickness of 130.4 nm to 139.0 nm, and a second MgF2 film layer with the thickness of 87.1-92.2 nm. According to the lens increasing lens, ultrathin AG is used as a transition layer between a substrate and an anti-reflection film AR film layer. The ultra-thin layer AG has the characteristics of low refractive index and low absorption of a visible light band. The anti-reflection effect of the anti-reflection film cannot be weakened, the AG layer can be removed through a chemical soaking method after the coating quality problem occurs, the effect of thoroughly stripping the AR film is achieved, then the anti-reflection film is deposited again, the repair rate of the anti-reflection lens can be increased, the production cost is reduced, and the anti-reflection lens has outstanding contribution to industrial application.

Description

technical field [0001] The invention relates to the field of optics, in particular to a lens-increasing sheet which is convenient for repair and a preparation method thereof. Background technique [0002] When the light is vertically incident on the ordinary glass surface, the ratio of the intensity of the reflected light on the incident surface to the intensity of the incident light (reflectivity) is only determined by the ratio of the refractive index of the adjacent medium: each surface of crown glass with a refractive index of 1.52 The reflectance is about 4.2%. Flint glass with a higher refractive index has a more pronounced surface reflection. This surface reflection has caused two serious consequences: the loss of light energy reduces the brightness of the image; the surface reflected light undergoes multiple reflections or diffusion, and part of it becomes stray light, and finally reaches the image plane to reduce the contrast of the image. Image quality, especiall...

AI Technical Summary

Problems solved by technology

[0004] The coating process usually adopts PVD (Physical Vapor Deposition) technology. Although the coating equipment and process technology are mature now, the control accuracy of the film thickness is at the nanometer level, and the anti-reflection coating has smoothness and firmness in addition to the requirements of the spectral reflectance index. and other performance requirements

Therefore, if the coating index is unqualified or other performance indicators are unqualified, the lens can only be scrapped, because it is very difficult to completely remove the film layer deposited on the surface of the lens, and the film layer cannot be removed by chemical methods. The remaining uneven film layer will affect the film color, and there will be abnormalities such as color spots; the physical re-polishing method will cause problems such as unqualified lens sagittal height due to excessive removal of lens substrates

High rework cost and low yield

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