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CN-115728846-B - Imaging optical lens, image capturing device and electronic device

CN115728846BCN 115728846 BCN115728846 BCN 115728846BCN-115728846-B

Abstract

The present disclosure provides an imaging optical lens, an image capturing device and an electronic device, wherein the imaging optical lens comprises at least one optical lens, the optical lens comprises an anti-reflection film, the anti-reflection film comprises a high-low refractive index film and a graded refractive index film, and the high-low refractive index film is arranged between the optical lens and the graded refractive index film. The high-low refractive index film comprises at least one high refractive index film layer and at least one low refractive index film layer, and the high refractive index film layer and the low refractive index film layer are alternately stacked. The graded index film includes a plurality of holes, and the holes far from the optical lens are relatively larger than the holes near the optical lens. The surface of the imaging optical lens is plated with the uniform and compact anti-reflection film, so that the optical lens has remarkable anti-oxidation capability, and the wide-wavelength range anti-reflection effect can be achieved, so that the imaging optical lens with high imaging quality is satisfied.

Inventors

  • Cai Wendai
  • ZHANG JIANBANG
  • Cai Chengtou
  • DENG JUNHONG
  • ZHU GUOQIANG

Assignees

  • 大立光电股份有限公司

Dates

Publication Date
20260505
Application Date
20220901
Priority Date
20220803

Claims (20)

  1. 1. An imaging optical lens, comprising: at least one optical lens; the optical lens is made of glass and comprises an anti-reflection film, wherein the anti-reflection film is positioned on at least one surface of the optical lens; The anti-reflection film comprises a high-low refractive index film and a graded refractive index film, wherein the high-low refractive index film is arranged between the optical lens and the graded refractive index film; the high-low refractive index film comprises at least one high refractive index film layer and at least one low refractive index film layer, wherein the high refractive index film layer and the low refractive index film layer are alternately stacked, the low refractive index film layer contacts the optical lens, and the low refractive index film layer is mainly made of alumina; the graded index film comprises a plurality of holes, the holes far away from the optical lens are relatively larger than the holes near the optical lens, and the main material of the graded index film is metal oxide; wherein the total thickness of the anti-reflection film at the center of the optical lens is Tc, and the total thickness of the anti-reflection film at the periphery of the optical lens is Tp, which satisfies the following condition: 0%<|Tc-Tp|/Tc≤15.0%。
  2. 2. The imaging optical lens as claimed in claim 1, wherein a total film thickness of the antireflection film is tTK, which satisfies the following condition: 200nm≤tTK≤800nm。
  3. 3. the imaging optical lens of claim 1 wherein the high refractive index film layer has a refractive index NH that satisfies the following condition: 2.00≤NH。
  4. 4. the imaging optical lens of claim 1 wherein the low refractive index film layer has a refractive index NL that satisfies the following condition: NL≤1.80。
  5. 5. The imaging optical lens of claim 1 wherein the high refractive index film has a total film thickness TNH that satisfies the following condition: 1nm≤TNH≤60nm。
  6. 6. The imaging optical lens of claim 1, wherein the total film thickness of the low refractive index film layer is TNL, which satisfies the following condition: 1nm≤TNL≤300nm。
  7. 7. the imaging optical lens of claim 1 wherein the low refractive index film layer in contact with the optical lens has a film thickness TL1 that satisfies the following condition: 10nm≤TL1≤100nm。
  8. 8. The imaging optical lens as claimed in claim 1, wherein a film thickness of the graded index film is TNG, and a total film thickness of the antireflection film is tTK, which satisfies the following condition: 0.45≤TNG/tTK≤0.85。
  9. 9. the imaging optical lens as claimed in claim 1, wherein the graded index film is made of alumina.
  10. 10. The imaging optical lens of claim 1 wherein the total thickness of the anti-reflection film at the center of the optical lens is Tc and the total thickness of the anti-reflection film at the periphery of the optical lens is Tp, which satisfies the following condition: 0%<|Tc-Tp|/Tc≤10.0%。
  11. 11. The imaging optical lens as claimed in claim 1, wherein a horizontal displacement of a surface of the optical lens at a maximum effective diameter is SAG, and a total film thickness of the antireflection film is tTK, which satisfies the following condition: 0≤|SAG|/tTK≤10.0。
  12. 12. the imaging optical lens as claimed in claim 1, wherein the optical lens has an average reflectance of R40100 at a wavelength of 400nm to 1000nm, which satisfies the following condition: 0%<R40100≤1.00%。
  13. 13. the imaging optical lens as claimed in claim 1, wherein the optical lens has an average reflectance of R4070 at a wavelength of 400nm to 700nm, which satisfies the following condition: 0%<R4070≤1.00%。
  14. 14. The imaging optical lens as claimed in claim 1, wherein the optical lens has an average reflectance of R70100 at a wavelength of 700nm to 1000nm, which satisfies the following condition: 0%<R70100≤1.00%。
  15. 15. The imaging optical lens of claim 1 wherein the optical lens has a dispersion coefficient Vs that satisfies the following condition: 35.0≤Vs≤85.0。
  16. 16. The imaging optical lens of claim 15 wherein the refractive index of the optical lens is Ns, which satisfies the following condition: Ns≤1.85。
  17. 17. The imaging optical lens as claimed in claim 1, wherein the acid resistance of the optical lens is Da, the dispersion coefficient of the optical lens is Vs, which satisfies the following condition: 0.6≤Vs×Da/10≤13.0。
  18. 18. the imaging optical lens of claim 14, wherein the optical lens has an acid resistance of Da and a refractive index of Ns, which satisfies the following condition: 0.1≤Ns×Da≤4.5。
  19. 19. the imaging optical lens as claimed in claim 1, wherein the optical lens has a water resistance Dw and an abbe number Vs, which satisfies the following condition: 0<Vs×Dw≤10.0。
  20. 20. the imaging optical lens of claim 16, wherein the optical lens has a water resistance Dw and a refractive index Ns, which satisfies the following condition: 0<Ns×Dw×100≤50。

Description

Imaging optical lens, image capturing device and electronic device Technical Field The present disclosure relates to an imaging optical lens and an image capturing device, and more particularly, to an imaging optical lens and an image capturing device with good anti-reflection effect for an electronic device. Background The traditional anti-reflection film (ARC) technology has insufficient effect of reducing the reflectivity of a wide-wave-range, strong light in a long-wavelength region causes the degradation of image quality, when the incidence angle is increased, the optical path difference of reflected light between film layers is insufficient to achieve destructive interference conditions due to the increase of the internal ray path degree, so that the problem of serious reflection generated when the light is incident on the surface of a lens at a large angle cannot be solved, the clearer image can be provided due to the smaller dispersion degree on the characteristic of glass materials, although the dispersion correction of a large-caliber photographic lens is obviously facilitated, the oxidation resistance of water and oxygen in air is relatively poor, the traditional anti-reflection film technology mainly generates solidification or deposition effect on the contact surface through a plating material, and the evenness and the coverage compactness of a plated film are directly related to the particle size of the material and the flatness of the contact surface, so that the traditional anti-reflection film technology is often limited by the optical lens with severe surface shape change, and cannot meet the requirement of a high-order optical system for reducing the reflectivity of the lens. Therefore, in the higher-order optical system with larger degree of freedom of surface shape variation, it has become an important objective to develop a coating technique with excellent substrate protection effect and good anti-reflection effect. Disclosure of Invention According to the imaging optical lens, the imaging device and the electronic device, the uniform and compact anti-reflection film is plated on the surface of the imaging optical lens, so that the optical lens with insufficient water resistance and acid resistance has remarkable anti-oxidation capability, and the imaging optical lens is beneficial to achieving the anti-reflection effect in a wide wavelength range so as to meet the requirement of the imaging optical lens with high imaging quality. According to one aspect of the present disclosure, an imaging optical lens is provided, which includes at least one optical lens. The optical lens is made of glass and comprises an anti-reflection film which is positioned on at least one surface of the optical lens. The anti-reflection film comprises a high-low refractive index film and a graded refractive index film, and the high-low refractive index film is arranged between the optical lens and the graded refractive index film. The high-low refractive index film comprises at least one high refractive index film layer and at least one low refractive index film layer, the high refractive index film layer and the low refractive index film layer are alternately stacked, the low refractive index film layer contacts the optical lens, and the main material of the low refractive index film layer is alumina. The graded index film comprises a plurality of holes, the holes far away from the optical lens are relatively larger than the holes close to the optical lens, and the main material of the graded index film is metal oxide. The total thickness of the antireflection film at the center of the optical lens is Tc, and the total thickness of the antireflection film at the periphery of the optical lens is Tp, which satisfies the following condition that 0% </Tc-Tp/Tc is 15.0% or less. According to the imaging optical lens of the foregoing embodiment, wherein the total film thickness of the antireflection film is tTK, it is possible to satisfy the following condition that 200 nm≤ tTK≤800 nm. According to the imaging optical lens of the foregoing embodiment, wherein the refractive index of the high refractive index film layer is NH, it can satisfy the following condition that 2.00. Ltoreq.NH. According to the imaging optical lens of the foregoing embodiment, wherein the refractive index of the low refractive index film layer is NL, it may satisfy the following condition that NL is 1.80 or less. According to the imaging optical lens of the foregoing embodiment, wherein the total film thickness of the high refractive index film layer is TNH, it is possible to satisfy the condition that TNH is 1 nm≤60 nm. According to the imaging optical lens of the foregoing embodiment, wherein the total film thickness of the low refractive index film layer is TNL, it is possible to satisfy the condition that TNL is 1 nm≤300 nm. According to the imaging optical lens of the foregoing embodiment, wherein the film thickness of the low refracti