Infrared and ultraviolet cutoff filtering film structure for large curvature lens surface and manufacture method thereof

Abstract

The invention provides an infrared and ultraviolet cutoff filtering film structure for a large curvature lens surface and a manufacture method thereof. The infrared and ultraviolet cutoff filtering film structure for the large curvature lens surface comprises a large curvature lens which is provided with an infrared and ultraviolet cutoff filtering film. The infrared and ultraviolet cutoff filtering film comprises low refractive index film layers and high refractive index film layers which are alternately stacked on the large curvature lens, the number of the low refractive index film layers is larger than or equal to 10, and number of the high refractive index film layers is larger than or equal to 10. The infrared and ultraviolet cutoff filtering film is a 45-layer multi-film-layer structure. The low refractive index film layers are made of SiO2, and the high refractive index film layers are made of Ti3O5 or Ta2O5. The infrared and ultraviolet cutoff filtering film structure has the advantages of a simple and reasonable structure, consistent film layer uniformity, and strong film firmness.

Description

technical field [0001] The invention relates to the field of optical thin film design and process manufacturing, in particular to an infrared and ultraviolet cut-off filter film structure and a manufacturing method for the surface of a large curvature lens. Background technique [0002] Infrared light suppression is one of the necessary functions of the image sensor, because CCD and CMOS are different from the human eye in terms of light sensitivity. Human eyes can only see visible light of 380-780nm, while CCD and CMOS can sense infrared light and ultraviolet light, especially sensitive to infrared light. Therefore, it is necessary to suppress infrared light and ultraviolet light, and maintain a high transmittance of visible light, so that the light sensitivity of CCD and / or COMS is close to that of human eyes, so that the captured images also conform to the sensitivity of human eyes. [0003] Generally speaking, infrared and ultraviolet cut-off filters can be added to the...

AI Technical Summary

Problems solved by technology

[0006] However, depositing an optical thin film on the surface of a large-curvature lens is difficult to overcome for a coating machine with a central rotary method. It is difficult to ensure that the thickness of the film layer on the edge of the large-curvature lens sheet is consistent with the thickness of the central film layer, and the edge film layer The firmness is very weak and other problems

The main reason is that the deposition angle of the coating on the edge of the large curvature lens surface is larger than that in the center, based on the understanding that the limited mobility of deposited atoms or molecules on the surface of the substrate forms a columnar thin film structure, resulting in a thinner film at the edge and poorer density of the film.

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