Optical lens assembly and optical module
An optical lens assembly includes a glass lens element. The glass lens element has a refractive power, an optical surface of the glass lens element is non-planar, an anti-reflective membrane layer is formed on the optical surface, and the anti-reflective membrane layer includes a nanostructure layer and a structure connection film. The nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and a material of the nanostructure layer includes aluminum oxide. The structure connection film is disposed between the optical surface and the nanostructure layer, the structure connection film includes at least one silicon dioxide layer, the at least one silicon dioxide layer contacts a bottom of the nanostructure layer physically, and a thickness of the at least one silicon dioxide layer is greater than or equal to 20 nm and less than or equal to 150 nm.
1 . An optical lens assembly, an optical axis passing through the optical lens assembly, comprising:
a glass lens element having a refractive power, an optical surface of the glass lens element being non-planar, an anti-reflective membrane layer formed on the optical surface, and the anti-reflective membrane layer comprising:
a nanostructure layer having a plurality of ridge-like protrusions extending non-directionally from the optical surface, and a material of the nanostructure layer comprising aluminum oxide; and
a structure connection film disposed between the optical surface and the nanostructure layer, the structure connection film comprising at least one silicon dioxide layer, the at least one silicon dioxide layer physically contacting a bottom of the nanostructure layer, and a thickness of the at least one silicon dioxide layer being greater than or equal to 20 nm and less than or equal to 150 nm;
wherein the glass lens element has a first average linear expansivity α 1 in a temperature region between −30° C. to 70° C., and the following condition is satisfied:
12×10 −7 /K<α 1 <210×10 −7 /K;
wherein the nanostructure layer is directly connected to the structure connection film, the material of the nanostructure layer is different from a material of the structure connection film;
wherein a top of the structure connection film is partially covered by the nanostructure layer.
2 . The optical lens assembly of claim 1 , wherein each of the ridge-like protrusions is in a shape shrinking from a bottom to a top thereof, and an average structure height of the nanostructure layer is greater than or equal to 80 nm and less than or equal to 350 nm.
3 . The optical lens assembly of claim 1 , wherein a distance from a first side surface to a second side surface of the optical lens assembly along the optical axis is D S1SL , a distance from the optical surface to the second side surface along the optical axis is D SoSL , and the following condition is satisfied:
0.12≤D SoSI /D S1SL <0.985.
4 . The optical lens assembly of claim 1 , wherein a maximum value of a reflectivity of the optical surface of the glass lens element in a wavelength region between 400 nm and 780 nm is R abs , and the following condition is satisfied:
0%≤R abs ≤1.0%.
5 . The optical lens assembly of claim 4 , wherein an average value of the reflectivity of the optical surface of the glass lens element in the wavelength region between 400 nm and 780 nm is R avg , and the following condition is satisfied:
0%≤R avg ≤0.5%.
6 . The optical lens assembly of claim 1 , wherein the glass lens element has the first average linear expansivity α 1 in the temperature region between −30° C. to 70° C., the structure connection film has a second average linear expansivity α 2 in the temperature region between −30° C. to 70° C., and the following condition is satisfied:
0.2<α 1 /α 2 <41.
7 . The optical lens assembly of claim 1 , wherein a temperature coefficient of refractive index of the glass lens element in the temperature region between −30° C. to 70° C. is dn/dt, and the following condition is satisfied:
0.1×10 −6 /° C.≤|dn/dt|≤17×10 −6 /° C.
8 . The optical lens assembly of claim 1 , wherein the optical surface has an inflection point.
9 . The optical lens assembly of claim 1 , wherein a distance from an object-side surface of a first side lens element of the optical lens assembly to an image surface along the optical axis is TL, and the following condition is satisfied:
8 mm≤TL.
10 . The optical lens assembly of claim 1 , wherein the glass lens element is disposed at a first side of the optical lens assembly, and the optical lens assembly further comprises a plastic lens element disposed at an image side of the glass lens element along the optical axis.
11 . The optical lens assembly of claim 1 , further comprising a cemented lens element.
12 . The optical lens assembly of claim 1 , further comprising:
at least one light path folding element disposed on at least one of an object side and an image side of the optical lens assembly.
13 . An optical module, comprising:
a light source; and
an optical lens assembly, an optical axis passing through the optical lens assembly, comprising:
at least three lens elements, at least one of the at least three lens elements being a glass lens element, wherein the glass lens element has a refractive power, the glass lens element is closer to the light source than the other at least two lens elements, an optical surface of the glass lens element is non-planar, an anti-reflective membrane layer is formed on the optical surface, and the anti-reflective membrane layer comprises:
a nanostructure layer having a plurality of ridge-like protrusions extending non-directionally from the optical surface, and a material of the nanostructure layer comprising aluminum oxide; and
a structure connection film disposed between the optical surface and the nanostructure layer, the structure connection film comprising at least one silicon dioxide layer, the at least one silicon dioxide layer physically contacting a bottom of the nanostructure layer, and a thickness of the at least one silicon dioxide layer being greater than or equal to 20 nm and less than or equal to 150 nm;
wherein the glass lens element has a first average linear expansivity α 1 in a temperature region between −30° C. to 70° C., and the following condition is satisfied:
12×10 −7 /K<α 1 <210×10 −7 /K;
wherein the nanostructure layer is directly connected to the structure connection film, the material of the nanostructure layer is different from a material of the structure connection film;
wherein a top of the structure connection film is partially covered by the nanostructure layer.
14 . The optical module of claim 13 , wherein each of the ridge-like protrusions is in a shape shrinking from a bottom to a top thereof, and an average structure height of the nanostructure layer is greater than or equal to 80 nm and less than or equal to 350 nm.
15 . The optical module of claim 13 , wherein a distance from a first side surface to a second side surface of the optical lens assembly along the optical axis is D S1SL , a distance from the optical surface to the second side surface along the optical axis is D SoSL , and the following condition is satisfied:
0.12≤D SoSL /D S1SL <0.985.
16 . The optical module of claim 13 , wherein the glass lens element is an array lens element.
17 . The optical module of claim 13 , wherein a maximum value of reflectivity of the optical surface of the glass lens element in a wavelength region between 400 nm and 780 nm is R abs , and the following condition is satisfied:
0%≤R abs ≤1.0%.
18 . The optical module of claim 17 , wherein an average value of reflectivity of the optical surface of the glass lens element in the wavelength region between 400 nm and 780 nm is R avg , and the following condition is satisfied:
0%≤R avg ≤0.5%.
19 . The optical module of claim 13 , wherein the glass lens element has a first average linear expansivity α 1 in the temperature region between −30° C. to 70° C., the structure connection film has a second average linear expansivity α 2 in the temperature region between −30° C. to 70° C., and the following condition is satisfied:
0.2<α 1 /α 2 <41.
20 . The optical module of claim 13 , wherein the optical lens assembly further comprises:
at least one light path folding element disposed on at least one side of an object side and an image side of the optical lens assembly.
21 . An optical module, comprising:
a light source; and
an optical lens assembly, an optical axis passing through the optical lens assembly, comprising:
at least three lens elements, at least one of the at least three lens elements being a glass lens element, wherein the glass lens element has a refractive power, the glass lens element is closer to the light source than the other at least two lens elements, an optical surface of the glass lens element is non-planar, an anti-reflective membrane layer is formed on the optical surface, and the anti-reflective membrane layer comprises:
a nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and a material of the nanostructure layer comprising aluminum oxide; and
a structure connection film disposed between the optical surface and the nanostructure layer, the structure connection film comprising at least one silicon dioxide layer, the at least one silicon dioxide layer physically contacting a bottom of the nanostructure layer, and a thickness of the at least one silicon dioxide layer being greater than or equal to 20 nm and less than or equal to 150 nm;
wherein a maximum effective radius of the optical surface is Y, an intersection point between the optical surface and the optical axis to a position of the maximum effective radius of the optical surface has a maximum displacement SAG glass , the glass lens element has a first average linear expansivity « 1 in a temperature region between −30° C. to 70° C., and the following conditions are satisfied:
0.01≤SAG glass /Y≤0.99; and
12×10 −7 /K<α 1 <210×10 −7 /K;
wherein the nanostructure layer is directly connected to the structure connection film, the material of the nanostructure layer is different from a material of the structure connection film;
wherein a top of the structure connection film is partially covered by the nanostructure layer.
22 . The optical module of claim 21 , wherein each of the ridge-like protrusions is in a shape shrinking from bottom to top, and an average structure height of the nanostructure layer is greater than or equal to 80 nm and less than or equal to 350 nm.
23 . The optical module of claim 21 , wherein the glass lens element is an array lens element.
24 . The optical module of claim 21 , wherein a maximum value of reflectivity of the optical surface of the glass lens element in a wavelength region between 400 nm and 780 nm is R abs , and the following condition is satisfied:
0%≤R abs ≤1.0%.
25 . The optical module of claim 24 , wherein an average value of reflectivity of the optical surface of the glass lens element in a wavelength region between 400 nm and 780 nm is R avg , and the following condition is satisfied:
0%≤R avg ≤0.5%.
26 . The optical module of claim 21 , wherein the glass lens element has a first average linear expansivity α 1 in the temperature region between −30° C. to 70° C., the structure connection film has a second average linear expansivity α 2 in the temperature region between −30° C. to 70° C., and the following condition is satisfied:
0.2<α 1 /α 2 <41.
27 . The optical module of claim 21 , wherein the intersection point between the optical surface and the optical axis to a position of the maximum effective radius of the optical surface has a maximum displacement SAG glass , and the following condition is satisfied:
90 μm≤SAG glass .
28 . The optical module of claim 27 , wherein the optical surface has an inflection point.
29 . The optical module of claim 21 , wherein the optical lens assembly further comprises:
at least one light path folding element disposed on at least one side of an object side and an image side of the optical lens assembly.
30 . The optical module of claim 21 , wherein the light source is a plurality of display elements arranged in array.