Optical lens assembly and head-mounted electronic device
An optical lens assembly includes, an optical element group; and in order from a visual side to an image source side: a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, and an image source-side surface of the third lens being convex in a paraxial region thereof, and a partial-reflective-partial-transmissive element. Wherein the optical element group is disposed between the first lens and the third lens, and includes, in order from the visual side to the image source side: an absorptive polarizer, a reflective polarizer and a phase retarder. The optical lens assembly may become lightweight and have good image quality when satisfying a specific condition.
1. An optical lens assembly, comprising:
an optical element group; and
in order from a visual side to an image source side: a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, and an image source-side surface of the third lens being convex in a paraxial region thereof, and a partial-reflective-partial-transmissive element;
wherein the optical element group is disposed between the first lens and the third lens, and includes, in order from the visual side to the image source side: an absorptive polarizer, a reflective polarizer and a phase retarder, a radius of curvature of an image source-side surface of the first lens is R2, a thickness of the first lens along an optical axis is CT1, a focal length of the first lens is f1, a focal length of the optical lens assembly is f, and the following condition is satisfied: −5.88<(R2/CT1)*(f1/f)<110.22.
2. The optical lens assembly as claimed in claim 1 , wherein a focal length of the third lens is f3, the focal length of the optical lens assembly is f, and the following condition is satisfied: −6.92<f3/f<23.80.
3. The optical lens assembly as claimed in claim 1 , wherein a focal length of the third lens is f3, a radius of curvature of a visual-side surface of the first lens is R1, and the following condition is satisfied: −5.58<f3/R1<27.18.
4. The optical lens assembly as claimed in claim 1 , wherein a maximum effective radius of a visual-side surface of the first lens is CA1, an absolute value of 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 the maximum effective radius position on the visual-side surface of the first lens is TDP1, and the following condition is satisfied: 1.76<CA1/TDP1<137.17.
5. The optical lens assembly as claimed in claim 1 , wherein a maximum effective radius of the image source-side surface of the first lens is CA2, an absolute value of a displacement in parallel to the optical axis from an intersection between the image source-side surface of the first lens and the optical axis to the maximum effective radius position on the image source-side surface of the first lens is TDP2, and the following condition is satisfied: 1.43<CA2/TDP2<56.16.
6. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the image source-side surface of the third lens is R6, a thickness of the third lens along the optical axis is CT3, and the following condition is satisfied: −58.44<R6/CT3<−5.15.
7. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of a visual-side surface of the first lens is R1, the radius of curvature of the image source-side surface of the first lens is R2, the focal length of the first lens is f1, and the following condition is satisfied: −32.71 mm<(R1*R2)/f1<60.84 mm.
8. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of a visual-side surface of the first lens is R1, the radius of curvature of the image source-side surface of the first lens is R2, and the following condition is satisfied: −3.55<R1/R2<6.52.
9. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the image source-side surface of the third lens is R6, the radius of curvature of the image source-side surface of the first lens is R2, and the following condition is satisfied: −4.59<R6/R2<6.08.
10. The optical lens assembly as claimed in claim 1 , wherein a thickness of the second lens along the optical axis is CT2, a thickness of the third lens along the optical axis is CT3, and the following condition is satisfied: 0.22<CT3/CT2<7.58.
11. The optical lens assembly as claimed in claim 1 , wherein the thickness of the first lens along the optical axis is CT1, a thickness of the second lens along the optical axis is CT2, a thickness of the third lens along the optical axis is CT3, and the following condition is satisfied: 0.62<(CT1+CT2)/CT3<8.67.
12. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of a visual-side surface of the first lens is R1, the thickness of the first lens along an optical axis is CT1, and the following condition is satisfied: −13.48<R1/CT1<9.76.
13. The optical lens assembly as claimed in claim 1 , wherein the focal length of the first lens is f1, the focal length of the optical lens assembly is f, and the following condition is satisfied: 1.42<f1/f<16.1.
14. The optical lens assembly as claimed in claim 1 , wherein a maximum effective radius of the image source-side surface of the first lens is CA2, a distance from a visual-side surface of the first lens to an image source plane along the optical axis is TL, a radius of curvature of the visual-side surface of the first lens is R1, and the following condition is satisfied: −49.53 mm<(CA2/TL)*R1<43.8 mm.
15. A head-mounted electronic device, comprising:
a housing;
an optical lens assembly disposed in the housing;
an image source disposed on an 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;
wherein the optical lens assembly comprising:
an optical element group; and
in order from a visual side to an image source side: a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, and an image source-side surface of the third lens being convex in a paraxial region thereof, and a partial-reflective-partial-transmissive element;
wherein the optical element group is disposed between the first lens and the third lens, and includes, in order from the visual side to the image source side: an absorptive polarizer, a reflective polarizer and a phase retarder, a radius of curvature of an image source-side surface of the first lens is R2, a thickness of the first lens along an optical axis is CT1, a focal length of the first lens is f1, a focal length of the optical lens assembly is f, and the following condition is satisfied: −5.88<(R2/CT1)*(f1/f)<110.22.
16. The head-mounted electronic device as claimed in claim 15 , wherein a focal length of the third lens is f3, the focal length of the optical lens assembly is f, and the following condition is satisfied: −6.92<f3/f<23.80.
17. The head-mounted electronic device as claimed in claim 15 , wherein a maximum effective radius of a visual-side surface of the first lens is CA1, an absolute value of 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 the maximum effective radius position on the visual-side surface of the first lens is TDP1, and the following condition is satisfied: 1.76<CA1/TDP1<137.17.
18. The head-mounted electronic device as claimed in claim 15 , wherein a radius of curvature of a visual-side surface of the first lens is R1, the radius of curvature of the image source-side surface of the first lens is R2, the focal length of the first lens is f1, and the following condition is satisfied: −32.71 mm<(R1*R2)/f1<60.84 mm.
19. The head-mounted electronic device as claimed in claim 15 , wherein the thickness of the first lens along the optical axis is CT1, a thickness of the second lens along the optical axis is CT2, a thickness of the third lens along the optical axis is CT3, and the following condition is satisfied: 0.62<(CT1+CT2)/CT3<8.67.
20. The head-mounted electronic device as claimed in claim 15 , wherein a maximum effective radius of the image source-side surface of the first lens is CA2, a distance from a visual-side surface of the first lens to the image source plane along the optical axis is TL, a radius of curvature of the visual-side surface of the first lens is R1, and the following condition is satisfied: −49.53 mm<(CA2/TL)*R1<43.8 mm.