Camera lens
A camera lens is disclosed and includes a first lens with positive refractive power, whose object side surface and image side surface are both aspheric surfaces; an aperture; a second lens with positive refractive power, whose object side surface and image side surface are both aspheric surfaces; and a third lens with negative refractive power, whose object side surface and image side surface are both aspheric surfaces. Specific conditions are satisfied.
1. A camera lens comprising, from the object side to the image side:
a first lens with positive refractive power, whose object side surface and image side surface are both aspheric surfaces;
an aperture;
a second lens with positive refractive power, whose object side surface and image side surface are both aspheric surfaces;
a third lens with negative refractive power, whose object side surface and image side surface are both aspheric surfaces; wherein the object side surface of the first lens is convex and the image side surface is concave, the camera lens satisfies the following conditions:
0.6< f/f 1<1.0 (1);
−1.6<( R 1+ R 2)/( R 1− R 2)<−1.2 (2);
0.15< d 1/ f< 0.2 (3);
−1.5< f/f 3<−1 (4);
1.3<( R 5+ R 6)/( R 5 −R 6)<2.1 (5);
1.0< f/f 2<2.0 (6);
2.2<( R 3+ R 4)/( R 3 −R 4)<2.8 (7);
where,
f is the focal distance of the camera lens;
f 1 is the focal distance of the first lens;
f 2 is the focal distance of the second lens;
R 1 is the object side curvature radius of the first lens;
R 2 is the image side curvature radius of the first lens;
d 1 is the center thickness of the first lens;
f 3 is the focal distance of the third lens;
R 3 is the object side curvature radius of the second lens;
R 4 is the image side curvature radius of the second lens;
R 5 is the object side curvature radius of the third lens;
R 6 is the image side curvature radius of the third lens.
2. The camera lens according to claim 1 further satisfying the following condition:
0.2< d 3/ f <0.5 (8);
1.5< d 3/ d 5<3.5 (9);
where,
d 3 is the center thickness of the second lens;
d 5 is the center thickness of the third lens.
3. The camera lens according to claim 2 , wherein the third lens is made of plastic and has at least one inflexion point.
4. The camera lens according to claim 3 further satisfying the following condition:
10< d 2/ d 4<20 (10);
2.5< R 2/ f< 4.0 (11);
where
d 2 is the axial distance between the image side surface of the first lens and the object side surface of the second lens;
d 4 is the axial distance between the image side surface of the second lens and the object side surface of the third lens.
5. The camera lens according to claim 4 further satisfying the following condition:
1.0< v 1/ v 2<1.2 (12);
where,
v 1 is the abbe number of the first lens;
v 2 is the abbe number of the second lens.