Optical lens assembly and photographing module
An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens element, a second lens element, a third lens element, and an infrared bandpass filter. An entrance pupil diameter of the optical lens assembly is EPD, a half of a maximum field of view of the optical lens assembly is HFOV, and the following condition is satisfied: 0.59<EPD/tan(HFOV)<1.33.
1. An optical lens assembly, in order from an object side to an image side, comprising:
a stop;
a first lens with positive refractive power, comprising an object-side surface and an image-side surface, the image-side surface of the first lens being convex near an optical axis;
a second lens with positive refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the second lens being concave near an optical axis, and the image-side surface of the second lens being convex near an optical axis;
a third lens with negative refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the third lens being convex near an optical axis, the image-side surface of the third lens being concave near an optical axis, and one of the object-side surface and the image-side surface of the third lens is aspheric; and
an IR band-pass filter;
wherein an entrance pupil diameter of the optical lens assembly is EPD, half of a maximum field of view of the optical lens assembly is HFOV, and the following condition is satisfied: 0.59<EPD/tan(HFOV)<1.33.
2. The optical lens assembly according to claim 1 , wherein a radius of curvature of the object-side surface of the third lens is R5, and the following condition is satisfied: 1.05<R5/EPD<2.0.
3. The optical lens assembly according to claim 1 , wherein a radius of curvature of the object-side surface of the second lens is R3, a radius of curvature of the image-side surface of the second lens is R4, and the following condition is satisfied: 0.97<R3/R4<1.72.
4. The optical lens assembly according to claim 1 , wherein a radius of curvature of the object-side surface of the third lens is R5, a radius of curvature of the image-side surface of the third lens is R6, and the following condition is satisfied: 1.2<R5/R6<2.37.
5. The optical lens assembly according to claim 1 , wherein a focal length of the optical lens assembly is f, a focal length of the first lens is f1, and the following condition is satisfied: 0.3<f/f1<0.8.
6. The optical lens assembly according to claim 1 , wherein a focal length of the optical lens assembly is f, a focal length of the first lens is f1, a focal length of the third lens is f3, and the following condition is satisfied: −2.8<(f1+f3)/f<−0.32.
7. The optical lens assembly according to claim 1 , wherein a focal length of the third lens is f3, a central thickness of the third lens along the optical axis is CT3, and the following condition is satisfied: −18.04<f3/CT3<−6.71.
8. The optical lens assembly according to claim 1 , wherein a focal length of the optical lens assembly is f, a radius of curvature of the object-side surface of the second lens is R3, a radius of curvature of the image-side surface of the second lens is R4, and the following condition is satisfied: 2.27<f/(R3*R4)<4.98.
9. The optical lens assembly according to claim 1 , wherein a focal length of the optical lens assembly is f, a radius of curvature of the object-side surface of the first lens is R1, an f-number of the optical lens assembly is Fno, and the following condition is satisfied: −5.81<(R1/f)+Fno<7.23.
10. The optical lens assembly according to claim 1 , wherein a central thickness of the first lens along the optical axis is CT1, a central thickness of the second lens along the optical axis is CT2, a distance from the image-side surface of the first lens to the object-side surface of the second lens along the optical axis is T12, and the following condition is satisfied: 1.92<(CT1+CT2)/T12<11.85.
11. The optical lens assembly according to claim 1 , wherein a focal length of the first lens is f1, a distance from the object-side surface of the first lens to the image-side surface of the third lens along the optical axis is TD, and the following condition is satisfied: 0.77<f1*sin(HFOV))/TD<2.36.
12. The optical lens assembly according to claim 1 , wherein a central thickness of the first lens along the optical axis is CT1, a central thickness of the second lens along the optical axis is CT2, and the following condition is satisfied: 0.60<CT1/CT2<1.54.
13. The optical lens assembly according to claim 1 , wherein a distance from the image-side surface of the third lens to the image plane along the optical axis is BFL, a distance from the image-side surface of the first lens to the object-side surface of the second lens along the optical axis is T12, a distance from the image-side surface of the second lens to the object-side surface of the third lens along the optical axis is T23, and the following condition is satisfied: 1.93<BFL/(T12+T23)<11.47.
14. A photographing module, comprising:
a lens barrel;
an optical lens assembly disposed in the lens barrel; and
an image sensor disposed on an image plane of the optical lens assembly,
wherein the optical lens assembly, in order from an object side to an image side, comprising:
a stop;
a first lens with positive refractive power, comprising an object-side surface and an image-side surface, wherein the image-side surface of the first lens being convex near an optical axis;
a second lens with positive refractive power, comprising an object-side surface and an image-side surface, wherein the object-side surface of the second lens being concave near an optical axis, and the image-side surface of the second lens being convex near an optical axis;
a third lens with negative refractive power, comprising an object-side surface and an image-side surface, wherein the object-side surface of the third lens being convex near an optical axis, the image-side surface of the third lens being concave near an optical axis, and one of the object-side surface and the image-side surface of the third lens is aspheric; and
an IR band-pass filter;
wherein an entrance pupil diameter of the optical lens assembly is EPD, half of a maximum field of view of the optical lens assembly is HFOV, and the following condition is satisfied: 0.59<EPD/tan(HFOV)<1.33.
15. The photographing module according to claim 14 , wherein a radius of curvature of the object-side surface of the third lens is R5, and the following condition is satisfied: 1.05<R5/EPD<2.0.
16. The photographing module according to claim 14 , wherein a focal length of the optical lens assembly is f, a focal length of the first lens is f1, a focal length of the third lens is f3, and the following condition is satisfied: −2.8<(f1+f3)/f<−0.32.
17. The photographing module according to claim 14 , wherein a focal length of the optical lens assembly is f, a radius of curvature of the object-side surface of the first lens is R1, an f-number of the optical lens assembly is Fno, and the following condition is satisfied: −5.81<(R1/f)+Fno<7.23.
18. The photographing module according to claim 14 , wherein a focal length of the first lens is f1, a distance from the object-side surface of the first lens to the image-side surface of the third lens along the optical axis is TD, and the following condition is satisfied: 0.77<f1*sin(HFOV))/TD<2.36.
19. The photographing module according to claim 14 , wherein a central thickness of the first lens along the optical axis is CT1, a central thickness of the second lens along the optical axis is CT2, and the following condition is satisfied: 0.60<CT1/CT2<1.54.
20. The photographing module according to claim 14 , wherein a distance from the image-side surface of the third lens to the image plane along the optical axis is BFL, a distance from the image-side surface of the first lens to the object-side surface of the second lens along the optical axis is T12, a distance from the image-side surface of the second lens to the object-side surface of the third lens along the optical axis is T23, and the following condition is satisfied: 1.93<BFL/(T12+T23)<11.47.