Camera lens

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

a first lens having a negative refractive power;

a second lens having a positive refractive power, an image-side surface of the second lens being configured as a convex surface and material of the second lens being glass;

a third lens having a positive refractive power, an image-side surface of the third lens being configured as a convex surface;

a fourth lens having a negative refractive power;

a fifth lens having a positive refractive power; and

a sixth lens having a negative refractive power, an object-side surface of the sixth lens being configured as a convex surface and an image-side surface of the sixth lens being configured as a concave surface,

wherein the camera lens satisfies following conditional expressions:

3.18 mm< f< 3.68 mm,

4.62 mm< f 2<9.05 mm,

−10.68 mm< f 4<−4.75 mm,

−1.7< f 2/ f 4<−0.7,

in which f denotes an effective focal length of the camera lens, f2 denotes an effective focal length of the second lens; f4 denotes an effective focal length of the fourth lens.

2. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression: 1<f2/f<3, in which f2 denotes the effective focal length of the second lens.

3. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression:

0.3< CT 1/ CT 2<0.9,

in which CT1 denotes a center thickness of the first lens in an optical axis; CT2 denotes a center thickness of the second lens in the optical axis.

4. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression:

0.03< SAG 11/ TTL< 0.08,

in which SAG11 denotes an axial distance from an intersection point of an object-side surface of the first lens with an optical axis to a vertex of an effective radius of the object-side surface of the first lens; TTL denotes an axial distance from the object-side surface of the first lens to an imaging surface.

5. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression:

0.05< SAG 12/ TTL< 0.1,

in which SAG12 denotes an axial distance from an intersection point of an image-side surface of the first lens with an optical axis to a vertex of an effective radius of the image-side surface of the first lens; TTL denotes an axial distance from an object-side surface of the first lens to an imaging surface.

6. The camera lens according to claim 1 , wherein an image-side surface of the fifth lens is configured as a convex surface.

7. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression:

0.5< DT 11/ DT 62<1,

in which DT11 denotes an effective radius of an object-side surface of the first lens; DT62 denotes an effective radius of the image-side of the sixth lens.

8. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression:

1.1< DT 11/ DT 52<1.5,

in which DT11 denotes an effective radius of an object-side surface of the first lens; DT52 denotes an effective radius of an image-side surface of the fifth lens.

9. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional expression: 1<ImgH/f<1.5, in which ImgH denotes a half of a diagonal line of an effective pixel area in an imaging surface of the camera lens.

10. The camera lens according to claim 1 , wherein an image-side surface of the first lens is configured as a concave surface.