Granted Patent B2

US 12,411,307 · App. 17/553,963 · Granted Sep 9, 2025

Inventors: Chien-Pang Chang (Taichung, TW); Wen-Yu Tsai (Taichung, TW); Chun-Hung Teng (Taichung, TW); Kuo-Chiang Chu (Taichung, TW)

Assignee: LARGAN PRECISION CO., LTD.

G02B9/60G02B1/04G02B1/11G02B9/62G02B9/64

Abstract

Claims (44)

1. An optical lens assembly, comprising, from an object side to an image side:

at least five optical lens elements;

wherein at least one of the optical lens elements comprises an anti-reflective coating, the optical lens element comprising the anti-reflective coating is made of a plastic material, the anti-reflective coating is arranged on an object-side surface or an image-side surface of the optical lens element comprising the anti-reflective coating, the anti-reflective coating comprises at least one coating layer, the coating layer at an outer of the anti-reflective coating is made of metal oxide, the anti-reflective coating comprises a plurality of holes, and sizes of the plurality of holes adjacent to the outer of the anti-reflective coating are relatively larger than sizes of the plurality of holes adjacent to an inner of the anti-reflective coating;

wherein a refractive index of the optical lens element comprising the anti-reflective coating is Ns, the coating layer at the innermost of the anti-reflective coating is a first coating layer, a refractive index of the first coating layer is N1, a thickness of the first coating layer is TL1, a super-wide field of wavelength factor of the optical lens assembly as arranging the anti-reflective coating is Farw, Farw=((N1−Ns)/(N1+Ns)) 2 , an average of tangent slopes in an optical effective diameter region of a surface of the optical lens element comprising the anti-reflective coating is SPavg, a minimum of the tangent slopes in the optical effective diameter region of the surface of the optical lens element comprising the anti-reflective coating is SPmin, a second anti-reflective coating arranging factor of the optical lens assembly is Far2, Far2=1/(|SPavg|×|SPmin|), and the following conditions are satisfied:

N 1< Ns;

50 nm≤ TL 1≤200 nm;

Farw≤0.60; and

0.100≤ Far 2.

2. The optical lens assembly of claim 1 , wherein a central thickness of the optical lens element comprising the anti-reflective coating is CT, a maximum of displacements in parallel with an optical axis from an axial vertex of the optical lens element comprising the anti-reflective coating to the surface of the optical lens element comprising the anti-reflective coating is SAGmax, a first anti-reflective coating arranging factor of the optical lens assembly is Far1, Far1=|SAGmax|/CT, and the following condition is satisfied:

0.500≤ Far 1.

3. The optical lens assembly of claim 2 , wherein the average of the tangent slopes in the optical effective diameter region of the surface of the optical lens element comprising the anti-reflective coating is SPavg, the minimum of the tangent slopes in the optical effective diameter region of the surface of the optical lens element comprising the anti-reflective coating is SPmin, the second anti-reflective coating arranging factor of the optical lens assembly is Far2, Far2=1/(|SPavg|×|SPmin), and the following condition is satisfied:

0.400≤ Far 2≤0.9.

4. The optical lens assembly of claim 1 , wherein a central thickness of the optical lens element comprising the anti-reflective coating is CT, a maximum of displacements in parallel with an optical axis from an axial vertex of the optical lens element comprising the anti-reflective coating to the surface of the optical lens element comprising the anti-reflective coating is SAGmax, a first anti-reflective coating arranging factor of the optical lens assembly is Far1, Far1=|SAGmax|/CT, the average of the tangent slopes in the optical effective diameter region of the surface of the optical lens element comprising the anti-reflective coating is SPavg, the minimum of the tangent slopes in the optical effective diameter region of the surface of the optical lens element comprising the anti-reflective coating is SPmin, the second anti-reflective coating arranging factor of the optical lens assembly is Far2, Far2=1/(|SPavg|×|SPmin|), the refractive index of the optical lens element comprising the anti-reflective coating is Ns, the refractive index of the first coating layer is N1, the super-wide field of wavelength factor of the optical lens assembly as arranging the anti-reflective coating is Farw, Farw=((N1−Ns)/(N1+Ns) 2 , a major anti-reflective coating arranging factor of the optical lens assembly is FAR, FAR=LOG (Far1×Far2×Farw), and the following condition is satisfied:

−7.000≤ FAR.

5. The optical lens assembly of claim 4 , wherein the refractive index of the optical lens element comprising the anti-reflective coating is Ns, and the following condition is satisfied:

1.530≤ Ns≤ 1.690.

6. The optical lens assembly of claim 5 , wherein the refractive index of the first coating layer is N1, and the following condition is satisfied:

1.37≤ N 1≤1.63.

7. The optical lens assembly of claim 6 , wherein a material of the first coating layer is SiO 2 .

8. The optical lens assembly of claim 7 , wherein the anti-reflective coating comprises at least two coating layers made of different main materials.

9. The optical lens assembly of claim 1 , wherein a wavelength at a trough with lowest reflectance of the optical lens element comprising the anti-reflective coating is Wtmin, and the following condition is satisfied:

400 nm≤ Wt min≤750 nm.

10. The optical lens assembly of claim 9 , wherein a reflectance at the trough with lowest reflectance of the optical lens element comprising the anti-reflective coating is Rtmin, and the following condition is satisfied:

0.01%≤ Rt min≤0.50%.

11. The optical lens assembly of claim 10 , wherein an average reflectance between a wavelength of 400 nm-1000 nm of the optical lens element comprising the anti-reflective coating is R40100, and the following condition is satisfied:

0.05%≤ R 40100≤1.5%.

12. The optical lens assembly of claim 11 , wherein a reflectance at a wavelength of 700 nm of the optical lens element comprising the anti-reflective coating is R70, and the following condition is satisfied:

0.01%≤ R 70≤1.0%.

13. The optical lens assembly of claim 12 , wherein at least one surface of the optical lens element comprising the anti-reflective coating comprises at least one inflection point.

14. The optical lens assembly of claim 1 , wherein a total number of coating layers of the anti-reflective coating is tLs, and the following condition is satisfied:

1≤ tLs≤ 2.

15. The optical lens assembly of claim 14 , wherein the anti-reflective coating comprises a second coating layer connected to the first coating layer, a thickness of the second coating layer is TL2, and the following condition is satisfied:

100 nm≤ TL 2≤250 nm.

16. The optical lens assembly of claim 15 , wherein a total thickness of the first coating layer and the second coating layer of the anti-reflective coating is tTk, and the following condition is satisfied:

100 nm≤ tTk≤ 300 nm.

17. An imaging apparatus, comprising:

the optical lens assembly of claim 1 ; and

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

18. An electronic device, which is a mobile device, and the electronic device comprising:

the imaging apparatus of claim 17 .

19. An imaging apparatus, comprising:

the optical lens assembly of claim 1 ;

a Fresnel lens element, wherein at least one surface of the Fresnel lens element comprises an anti-reflective coating, and the anti-reflective coating of the Fresnel lens element is made of aluminum oxide; and

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

Assignments (1)

Priority Claims (1)

Continuity (3)

References Cited (72)