Miniature optical lens assembly having optical element, imaging apparatus and electronic device

1. A miniature optical lens assembly, which has at least one of optical element, comprising:

the optical element, comprising:

a low reflection layer disposed on at least one surface of the optical element, wherein the low reflection layer comprises:

a plurality of nanocrystalline grains located on one surface of the low reflection layer;

wherein the optical element is at least one of a light blocking element, an annular spacer element and a barrel element;

wherein an average diameter of the nanocrystalline grains is DC, a reflectance in a wavelength range of 380 nm-780 nm of the low reflection layer is R3878, and the following conditions are satisfied:

5 nm≤ DC ≤200 nm; and

R 3878≤0.50%.

2. The miniature optical lens assembly of claim 1 , wherein the average diameter of the nanocrystalline grains is DC, and the following condition is satisfied:

10 nm≤ DC ≤150 nm.

3. The miniature optical lens assembly of claim 2 , wherein the average diameter of the nanocrystalline grains is DC, and the following condition is satisfied:

39 nm≤ DC ≤88 nm.

4. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 380 nm-500 nm of the low reflection layer is R3850, and the following condition is satisfied:

R 3850≤0.40%.

5. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 400 nm-700 nm of the low reflection layer is R4070, and the following condition is satisfied:

R 4070≤0.50%.

6. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 400 nm-550 nm of the low reflection layer is R4055, and the following condition is satisfied:

R 4055≤0.40%.

7. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 450 nm-650 nm of the low reflection layer is R4565, and the following condition is satisfied:

R 4565≤0.40%.

8. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 500 nm-580 nm of the low reflection layer is R5058, and the following condition is satisfied:

R 5058≤0.50%.

9. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 550 nm-700 nm of the low reflection layer is R5570, and the following condition is satisfied:

R 5570≤0.30%.

10. The miniature optical lens assembly of claim 2 , wherein a reflectance in a wavelength range of 580 nm-780 nm of the low reflection layer is R5878, and the following condition is satisfied:

R 5878≤0.80%.

11. The miniature optical lens assembly of claim 2 , wherein the nanocrystalline grains are made of oxide material.

12. The miniature optical lens assembly of claim 11 , wherein the nanocrystalline grains are made of silicon dioxide (SiO 2 ).

13. The miniature optical lens assembly of claim 11 , wherein the nanocrystalline grains are made of aluminium oxide (Al 2 O 3 ).

14. The miniature optical lens assembly of claim 11 , wherein the nanocrystalline grains are made of titanium dioxide (TiO 2 ).

15. The miniature optical lens assembly of claim 2 , wherein the nanocrystalline grains are made of metal nitride material.

16. The miniature optical lens assembly of claim 1 , wherein the reflectance in the wavelength range of 380 nm-780 nm of the low reflection layer is R3878, and the following condition is satisfied:

R 3878≤0.30%.

17. The miniature optical lens assembly of claim 16 , wherein the reflectance in the wavelength range of 380 nm-780 nm of the low reflection layer is R3878, and the following condition is satisfied:

R 3878≤0.15%.

18. An imaging apparatus, comprising:

the miniature optical lens assembly of claim 1 ; and

an image sensor disposed on an image surface of the miniature optical lens assembly.

19. An electronic device, comprising:

the imaging apparatus of claim 18 .