Image capturing lens assembly
This invention provides an image capturing lens assembly in order from an object side to an image side comprising five lens elements with refractive power: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface, a second lens element with positive refractive power having a convex image-side surface, a third lens element with positive refractive power having a convex object-side surface, a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a fifth lens element with positive refractive power. By such arrangement, sufficient field of view is provided, and the aberration of the lens assembly is corrected for obtaining higher image resolution.
1. An image capturing lens assembly comprising five lens elements with refractive power, in order from an object side to an image side:
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a second lens element with positive refractive power having a convex image-side surface;
a third lens element with positive refractive power having a convex object-side surface;
a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side and the image-side surfaces of the fourth lens element is aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces of the fourth lens element, and the fourth lens element is made of plastic; and
a fifth lens element with positive refractive power, wherein at least one of the object-side and the image-side surfaces of the fifth lens element is aspheric, and the fifth lens element is made of plastic;
wherein a focal length of the image capturing lens assembly is f, a focal length of the first lens element is f 1 , a focal length of the second lens element is f 2 , a focal length of the third lens element is f 3 , an axial distance between the second lens element and the third lens element is T 23 , and they satisfy the following relations:
−1.45 <f/f 1<−0.55;
0.15 <f/f 2<1.0;
0.5 <f/f 3<1.5; and
0<( T 23/ f )*10<5.0.
2. The image capturing lens assembly according to claim 1 , wherein the axial distance between the second lens element and the third lens element is T 23 , the focal length of the image capturing lens assembly is f, and they satisfy the following relation:
0<( T 23 /f )*10<1.5.
3. The image capturing lens assembly according to claim 1 , further comprising a stop, an axial distance between the stop and an image plane is SL, an axial distance between the object-side surface of the first lens element and the image plane is TTL, and they satisfy the following relation:
0.5 <SL/TTL< 0.85.
4. The image capturing lens assembly according to claim 2 , wherein a radius of the curvature of the object-side surface of the third lens element is R 5 , a radius of the curvature of the object-side surface of the fourth lens element is R 7 , and they satisfy the following relation:
0 <R 5 /R 7<1.2.
5. The image capturing lens assembly according to claim 2 , wherein the focal length of the image capturing lens assembly is f, the focal length of the first lens element is f 1 , and they satisfy the following relation:
−1.25 <f/f 1<−0.70.
6. The image capturing lens assembly according to claim 2 , wherein the third lens element is made of glass.
7. The image capturing lens assembly according to claim 2 , wherein a radius of the curvature of the object-side surface of the fourth lens element is R 7 , a radius of the curvature of the image-side surface of the fourth lens element is R 8 , and they satisfy the following relation:
1.0<( R 7 +R 8)/( R 7 −R 8)<3.0.
8. The image capturing lens assembly according to claim 7 , wherein a central thickness of the first lens element is CT 1 , a central thickness of the fifth lens element is CT 5 , and they satisfy the following relation:
0.7 <CT 1 /CT 5<1.7.
9. The image capturing lens assembly according to claim 7 , wherein an Abbe number of the third lens element is V 3 , an Abbe number of the fourth lens element is V 4 , and they satisfy the following relation:
26 <V 3− V 4<45.
10. The image capturing lens assembly according to claim 7 , wherein the axial distance between the second lens element and the third lens element is T 23 , the focal length of the image capturing lens assembly is f, and they satisfy the following relation:
0<( T 23 /f )*10<0.5.
11. The image capturing lens assembly according to claim 1 , wherein the focal length of the image capturing lens assembly is f, the focal length of the first lens element is f 1 , the focal length of the third lens element is f 3 , and they satisfy the following relation:
0 <|f/f 1 |−f/f 3<0.8.
12. An image capturing lens assembly comprising, in order from an object side to an image side, a front lens group, a stop and a rear lens group:
the front lens group comprising, in order from an object side to an image side:
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and
a second lens element with positive refractive power having a convex image-side surface;
the rear lens group comprising, in order from an object side to an image side:
a third lens element with positive refractive power having a convex object-side surface;
a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces thereof, and the fourth lens element is made of plastic; and
a fifth lens element with positive refractive power, at least one of the object-side and the image-side surfaces thereof being aspheric, and the fifth lens element is made of plastic;
wherein a focal length of the image capturing lens assembly is f, a focal length of the second lens element is f 2 , a focal length of the third lens element is f 3 , a radius of the curvature of the object-side surface of the third lens element is R 5 , a radius of the curvature of the object-side surface of the fourth lens element is R 7 , and they satisfy the following relations:
0.15 <f/f 2<1.0;
0.5 <f/f 3<1.5; and
0 <R 5 /R 7<1.2.
13. The image capturing lens assembly according to claim 12 , wherein the focal length of the image capturing lens assembly is f, a focal length of the first lens element is f 1 , and they satisfy the following relation:
−1.45 <f/f 1<−0.55.
14. The image capturing lens assembly according to claim 12 , wherein a central thickness of the first lens element is CT 1 , a central thickness of the fifth lens element is CT 5 , and they satisfy the following relation:
0.7 <CT 1 /CT 5<1.7.
15. The image capturing lens assembly according to claim 12 , wherein the focal length of the image capturing lens assembly is f, the focal length of the first lens element is f 1 , the focal length of the third lens element is f 3 , and they satisfy the following relation:
0 <|f/f 1 |−f/f 3<0.8.
16. The image capturing lens assembly according to claim 12 , wherein at least one of the object-side and the image-side surfaces of the second lens element is aspheric, and the second lens element is made of plastic.
17. An image capturing lens assembly comprising five lens elements with refractive power, in order from an object side to an image side:
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a second lens element with positive refractive power having a convex image-side surface;
a third lens element with positive refractive power having a convex object-side surface;
a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces thereof, and the fourth lens element is made of plastic; and
a fifth lens element with positive refractive power, at least one of the object-side and the image-side surfaces thereof being aspheric, and the fifth lens element is made of plastic;
wherein a focal length of the image capturing lens assembly is f, a focal length of the second lens element is f 2 , a focal length of the third lens element is f 3 , a focal length of the first lens element is f 1 , and they satisfy the following relations:
0.15 <f/f 2<1.0;
0.5 <f/f 3<1.5; and
0 <|f/f 1 |−f/f 3<0.8.
18. The image capturing lens assembly according to claim 17 , wherein a radius of the curvature of the object-side surface of the third lens element is R 5 , a radius of the curvature of the object-side surface of the fourth lens element is R 7 , and they satisfy the following relation:
0 <R 5 /R 7<1.2.