Camera lens

1. A camera lens comprising, in an order from an object side to an image side:

a first lens with a positive refractive power;

a second lens with a negative refractive power;

a third lens with a positive refractive power;

a fourth lens with a negative refractive power; wherein

the camera lens satisfies the following conditions (1)˜(4) and (1a)˜(4a):

0.5< f 1/ f< 1.1  (1);

−2< f 2/ f<− 0.5  (2);

0.65< f 3/ f< 1.1  (3);

−2.5< f 4/ f<− 2.27  (4);

1.5 mm< f 1<3.0 mm  (1a);

−5 mm< f 2<−1.9 mm  (2a);

1 mm< f 3<2 mm  (3a);

−12 mm< f 4<−2 mm  (4a);

where,

f: Total focal length of the camera lens;

f1: Focal length of the first lens;

f2: Focal length of the second lens;

f3: Focal length of the third lens;

f4: Focal length of the fourth lens.

2. The camera lens as described in claim 1 further satisfying the following conditions (1b)˜(4b):

1.50< n 1<1.55  (1b);

1.60< n 2<1.70  (2b);

1.50< n 3<1.55  (3b);

1.50< n 4<1.55  (4b);

where,

n1: Refractive power of the first lens;

n2: Refractive power of the second lens;

n3: Refractive power of the third lens;

n4: Refractive power of the fourth lens.

3. The camera lens as described in claim 1 further satisfying the following conditions (1c)˜(4c):

40< v 1<60  (1c);

15< v 2<30  (2c);

40< v 3<60  (3c);

40< v 4<60  (4c);

where,

v1: Abbe number of the first lens;

v2: Abbe number of the second lens;

v3: Abbe number of the third lens;

v4: Abbe number of the fourth lens.

4. The camera lens as described in claim 1 , wherein the second lens satisfies the following conditions:

1.60< n 2<1.70;

15< v 2<30;

where,

n2: Refractive power of the second lens;

v2: Abbe number of the second lens.

5. The camera lens as described in claim 1 , wherein F value FNo of the camera lens meets the following condition:

FNo< 2.5;

where, FNo is the ratio between the total focal length of the camera lens as a whole and the incident pupil diameter.

6. The camera lens as described in claim 1 further including an aperture stop between the first lens and the second lens.

7. The camera lens as described in claim 1 , wherein the object side surface of the third lens is glued to the image side surface of the second lens.