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, a second lens, a third lens, and an IR band-pass filter, wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of an image-side surface of the third lens is R6, a focal length of the optical lens assembly is f, and following condition is satisfied: −6.83<HFOV/(R6/f)<44.10, which is favorable to the thinning and large field of view of the lens assembly.
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 object-side surface of the first lens being convex near an optical axis and the image-side surface of the first lens being convex near the optical axis, and the object-side surface and the image-side surface of the first lens being aspheric;
a second lens with refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the second lens being concave near the optical axis and the image-side surface of the second lens being convex near the optical axis, and the object-side surface and the image-side surface of the second lens being aspheric;
a third lens with positive refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the third lens being convex near the optical axis, and the object-side surface and the image-side surface of the third lens being aspheric; and
an IR band-pass filter;
wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of the image-side surface of the third lens is R6, a focal length of the optical lens assembly is f, a radius of curvature of the image-side surface of the first lens is R2, an entrance pupil diameter of the optical lens assembly is EPD, and following conditions are condition is satisfied: −6.83°<HFOV/(R6/f)≤11.97° and −10.42<R2/EPD<−2.00, or 27.92°≤HFOV/(R6/f)≤35.06°) and −10.42<R2/EPD<−2.00.
2. The optical lens assembly as claimed in claim 1 , wherein a radius of curvature of the object-side surface of the first lens is R1, a radius of curvature of the object-side surface of the second lens is R3, and following condition is satisfied: −8.68<R1/R3<−3.67.
3. The optical lens assembly as claimed in claim 1 , wherein the radius of curvature of the image-side surface of the first lens is R2, a radius of curvature of the object-side surface of the second lens is R3, and following condition is satisfied: 4.12<R2/R3<30.18.
4. The optical lens assembly as claimed in claim 1 , wherein a focal length of the second lens is f2, a central thickness of the second lens along the optical axis is CT2, and following condition is satisfied: −11.48<f2/CT2<30.11.
5. The optical lens assembly as claimed in claim 1 , wherein a central thickness of the third lens along the optical axis is CT3, a radius of curvature of the object-side surface of the third lens is R5, and following condition is satisfied: 0.26<CT3/R5<2.08.
6. The optical lens assembly as claimed in claim 1 , wherein 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, 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 following condition is satisfied: 46.90<TD/T23<103.89.
7. The optical lens assembly as claimed in claim 1 , wherein the optical lens assembly has the maximum view angle (field of view) FOV, the focal length of the optical lens assembly is f, and following condition is satisfied: 30.09°/mm<FOV/f<49.43°/mm.
8. The optical lens assembly as claimed in claim 1 , wherein half of the maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of the object-side surface of the second lens is R3, and following condition is satisfied: −115.99°/mm<HFOV/R3<−43.33°/mm.
9. The optical lens assembly as claimed in claim 1 , wherein the focal length of the optical lens assembly is f, a distance from the object-side surface of the first lens to an image plane along the optical axis is TL, a central thickness of the third lens along the optical axis is CT3, and following condition is satisfied: 4.81 mm<f*TL/CT3<16.67 mm.
10. The optical lens assembly as claimed in claim 1 , wherein the radius of curvature of the image-side surface of the first lens is R2, the radius of curvature of the image-side surface of the third lens is R6, and following condition is satisfied: −2.95<R2/R6<0.55.
11. The optical lens assembly as claimed in claim 1 , wherein the radius of curvature of the image-side surface of the third lens is R6, a focal length of the third lens is f3, and following condition is satisfied: −24.08<R6/f3<196.86.
12. The optical lens assembly as claimed in 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 following condition is satisfied: 0.00<f3/CT3<19.85.
13. The optical lens assembly as claimed in claim 1 , wherein a central thickness of the third lens along the optical axis is CT3, a central thickness of the second lens along the optical axis is CT2, and following condition is satisfied: 0.86<CT3/CT2<6.25.
14. The optical lens assembly as claimed in claim 1 , wherein the optical lens assembly has the maximum view angle (field of view) FOV, a distance from the object-side surface of the first lens to an image plane along the optical axis is TL, and following condition is satisfied: 16.46°/mm<F0V/TL<28.47°/mm.
15. The optical lens assembly as claimed in claim 1 , wherein half of the maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of the object-side surface of the first lens is R1, and following condition is satisfied: 16.11°/mm<HFOV/R1<40.24°/mm.
16. The optical lens assembly as claimed in claim 1 , wherein a focal length of the second lens is f2, a distance from the object-side surface of the first lens to an image plane along the optical axis is TL, half of the maximum view angle (field of view) of the optical lens assembly is HFOV, and following condition is satisfied: −12.36 mm 2 <f2*TL/cos(HFOV)<78.43 mm 2 .
17. 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, the object-side surface of the first lens being convex near an optical axis and the image-side surface of the first lens being convex near the optical axis, and the object-side surface and the image-side surface of the first lens being aspheric;
a second lens with refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the second lens being concave near the optical axis and the image-side surface of the second lens being convex near the optical axis, and the object-side surface and the image-side surface of the second lens being aspheric;
a third lens with positive refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the third lens being convex near the optical axis, and the object-side surface and the image-side surface of the third lens being aspheric; and
an IR band-pass filter;
wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of the image-side surface of the third lens is R6, a focal length of the optical lens assembly is f, a radius of curvature of the image-side surface of the first lens is R2, an entrance pupil diameter of the optical lens assembly is EPD, and following conditions are satisfied: −6.83°<HFOV/(R6/f)≤11.97° and −10.42<R2/EPD<−2.00, or 27.92°≤HFOV/(R6/f)≤35.06° and −10.42<R2/EPD<−2.00.
18. The photographing module as claimed in claim 17 , wherein the focal length of the optical lens assembly is f, a distance from the object-side surface of the first lens to the image plane along the optical axis is TL, a central thickness of the third lens along the optical axis is CT3, and following condition is satisfied: 4.81 mm<f*TL/CT3<16.67 mm.
19. The photographing module as claimed in claim 18 , wherein a focal length of the second lens is f2, the distance from the object-side surface of the first lens to the image plane along the optical axis is TL, half of the maximum view angle (field of view) of the optical lens assembly is HFOV, and following condition is satisfied: −12.36 mm 2 <f2*TL/cos(HFOV)<78.43 mm 2 .