Optical lens assembly and head-mounted electronic device
View Patent ↗An optical lens assembly includes, in order from a visual side to an image source side: a first lens with positive refractive power; an optical element including, in order from the visual side to the image source side, an absorptive polarizer, a reflective polarizer and a first phase retarder; a second lens with positive refractive power; a partial-reflective-partial-transmissive element; a second phase retarder; and an image source plane. The optical lens assembly has a total of two lenses with refractive power. A focal length of the optical lens assembly is f, a maximum image-source height of the optical lens assembly is INM, a focal length of the first lens is f1, a focal length of the second lens is f2, and following conditions are satisfied: 0.40<IMH/f<1.26 and 0.21<f2/f1<2.35. A head-mounted electronic device includes the optical lens assembly.
1 . An optical lens assembly, in order from a visual side to an image source side, comprising:
a first lens with positive refractive power, comprising a visual-side surface, and the visual-side surface of the first lens being convex in a paraxial region thereof;
an optical element, in order from the visual side to the image source side, comprising an absorptive polarizer, a reflective polarizer and a first phase retarder;
a second lens with positive refractive power, comprising a visual-side surface and an image source-side surface, the image source-side surface of the second lens being convex in a paraxial region thereof, and at least one of the visual-side surface and the image source-side surface of the second lens being aspheric;
a partial-reflective-partial-transmissive element;
a second phase retarder; and
an image source plane;
wherein a focal length of the optical lens assembly is f, a maximum image-source height of the optical lens assembly is IMH, a focal length of the first lens is f1, a focal length of the second lens is f2, a central thickness of the first lens along an optical axis is CT1, a displacement in parallel to the optical axis from an intersection between the visual-side surface of the first lens and the optical axis to a maximum effective radius position on the visual-side surface of the first lens is TDP1, and following conditions are satisfied: 0.40<IMH/f<1.26, 0.21<f2/f1<2.35, and 0.98<CT1/TDP1<5.79.
2 . The optical lens assembly as claimed in claim 1 , wherein the central thickness of the first lens along an optical axis is CT1, a central thickness of the second lens along the optical axis is CT2, and a following condition is satisfied: 0.62<CT2/CT1<6.97.
3 . The optical lens assembly as claimed in claim 1 , wherein the focal length of the optical lens assembly is f, the focal length of the first lens is f1, and a following condition is satisfied: 0.04<f/f1<0.28.
4 . The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the visual-side surface of the first lens is R1, the focal length of the first lens is f1, and a following condition is satisfied: 0.33<R1/f1<0.76.
5 . The optical lens assembly as claimed in claim 1 , wherein the focal length of the optical lens assembly is f, the focal length of the second lens is f2, and a following condition is satisfied: 0.07<f/f2<0.30.
6 . The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the image source-side surface of the second lens is R4, the focal length of the second lens is f2, and a following condition is satisfied: −1.20<R4/f2<−0.22.
7 . The optical lens assembly as claimed in claim 1 , wherein a distance from the visual-side surface of the first lens to the image source plane along an optical axis is TL, a radius of curvature of the visual-side surface of the first lens is R1, and a following condition is satisfied: 2.05<R1/TL<12.83.
8 . The optical lens assembly as claimed in claim 1 , wherein an Abbe number of the first lens is vd1, an Abbe number of the second lens is vd2, a refractive index of the first lens is nd1, and a following condition is satisfied: 0.93<(vd1*nd1)/vd2<2.16.
9 . The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the visual-side surface of the first lens is R1, a radius of curvature of the image source-side surface of the second lens is R4, and a following condition is satisfied: −2.74<R1/R4<−0.54.
10 . The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the visual-side surface of the second lens is R3, a radius of curvature of the image source-side surface of the second lens is R4, and a following condition is satisfied: −0.83<R4/R3<0.49.
11 . The optical lens assembly as claimed in claim 1 , wherein a distance from the visual-side surface of the second lens to the image source plane along an optical axis is T2M, a central thickness of the second lens along the optical axis is CT2, and a following condition is satisfied: 0.68<T2M/CT2<2.37.
12 . The optical lens assembly as claimed in claim 1 , wherein a distance from the visual-side surface of the first lens to the image source plane along an optical axis is TL, the maximum image-source height of the optical lens assembly is IMH, and a following condition is satisfied: 0.54<TL/IMH<1.80.
13 . The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the image source-side surface of the second lens is R4, a refractive index of the second lens is nd2, and a following condition is satisfied: −116.45 mm<R4/nd2<−19.09 mm.
14 . A head-mounted electronic device, comprising:
a housing;
the optical lens assembly of claim 1 disposed in the housing;
an image source disposed on the image source plane of the optical lens assembly in the housing; and
a controller disposed in the housing and electrically connected to the image source.
15 . The head-mounted electronic device as claimed in claim 14 , wherein a radius of curvature of the visual-side surface of the first lens is R1, a radius of curvature of the image source-side surface of the second lens is R4, and a following condition is satisfied: −2.74<R1/R4<−0.54.
16 . The head-mounted electronic device as claimed in claim 14 , wherein a radius of curvature of the visual-side surface of the second lens is R3, a radius of curvature of the image source-side surface of the second lens is R4, and a following condition is satisfied: −0.83<R4/R3<0.49.
17 . The head-mounted electronic device as claimed in claim 14 , wherein a distance from the visual-side surface of the first lens to the image source plane along an optical axis is TL, the maximum image-source height of the optical lens assembly is IMH, and a following condition is satisfied: 0.54<TL/IMH<1.80.