Optical lens, camera module, and electronic device
An optical lens, a camera module, and an electronic device are provided. The optical lens, from an object side to an image side along an optical axis, includes: a first lens element having a positive refractive power, where an object side surface of the first lens element protrudes and an image side surface of the first lens element protrudes; a second lens element having a negative refractive power, where an object side surface of the second lens element protrudes and an image side surface of the second lens element is recessed; and a third lens element having the negative refractive power, where an object side surface of the third lens element is recessed and an image side surface of the third lens element protrudes.
1 . An optical lens, from an object side to an image side along an optical axis, comprising:
a first lens element having a positive refractive power, wherein an object side surface of the first lens element protrudes and an image side surface of the first lens element protrudes;
a second lens element having a negative refractive power, wherein an object side surface of the second lens element protrudes and an image side surface of the second lens element is recessed; and
a third lens element having the negative refractive power, wherein an object side surface of the third lens element is recessed and an image side surface of the third lens element protrudes; wherein
Abbe numbers of the first lens element, the second lens element, and the third lens element are V1, V2, and V3 respectively, satisfying:
3.4<V1/V2<3.9, and 0.45<V2/V3<0.55; and
an effective focal length of the optical lens is f, and 20 mm<f<25 mm.
2 . The optical lens according to claim 1 , wherein the object side surface of the first lens element is a spherical surface, a curvature radius of the object side surface is R1, and 0 mm<R1<10 mm.
3 . The optical lens according to claim 1 , wherein the image side surface of the first lens element is a spherical surface, a curvature radius of the image side surface is R2, and −28 mm<R2<−10 mm; and
the object side surface of the second lens element is an aspheric surface, a curvature radius of the object side surface is R3, and 20 mm<R3<50 mm.
4 . The optical lens according to claim 1 , wherein the image side surface of the second lens element is an aspheric surface, a curvature radius of the image side surface is R4, and 10 mm<R4<25 mm.
5 . The optical lens according to claim 1 , wherein the object side surface of the third lens element is an aspheric surface, a curvature radius of the object side surface is R5, and −10 mm<R5<−1 mm; and
the image side surface of the third lens element is an aspheric surface, a curvature radius of the image side surface is R6, and −13 mm<R6<−2 mm.
6 . The optical lens according to claim 1 , wherein effective focal lengths of the first lens element, the second lens element, and the third lens element are f1, f2, and f3 respectively, satisfying:
8.0 mm<f1<15 mm;
−80 mm<f2<−40 mm; and
−30 mm<f3<−15 mm.
7 . The optical lens according to claim 1 , wherein center thicknesses of the first lens element, the second lens element, and the third lens element are CT1, CT2, and CT3 respectively, satisfying:
1 mm<CT1<3 mm;
1 mm<CT2<4 mm; and
1 mm<CT3<4 mm.
8 . The optical lens according to claim 1 , further comprising an aperture, wherein the aperture is disposed between the first lens element and the second lens element.
9 . The optical lens according to claim 1 , further comprising an infrared filter, wherein the infrared filter is disposed on an image side of the third lens element.
10 . The optical lens according to claim 1 , further comprising a prism, wherein the prism is disposed on the image side of the third lens element and is used to change a direction of light.
11 . A camera module, wherein the camera module comprises an optical lens, and an image sensor, wherein the image sensor is disposed on an image side of the optical lens,
wherein the optical lens is from an object side to the image side along an optical axis comprises:
a first lens element having a positive refractive power, wherein an object side surface of the first lens element protrudes and an image side surface of the first lens element protrudes;
a second lens element having a negative refractive power, wherein an object side surface of the second lens element protrudes and an image side surface of the second lens element is recessed; and
a third lens element having the negative refractive power, wherein an object side surface of the third lens element is recessed and an image side surface of the third lens element protrudes; wherein
Abbe numbers of the first lens element, the second lens element, and the third lens element are V1, V2, and V3 respectively, satisfying:
3.4<V1/V2<3.9, and 0.45<V2/V3<0.55; and
an effective focal length of the optical lens is f, and 20 mm<f<25 mm.
12 . The camera module according to claim 11 , wherein the object side surface of the first lens element is a spherical surface, a curvature radius of the object side surface is R1, and 0 mm<R1<10 mm.
13 . The camera module according to claim 11 , wherein the image side surface of the first lens element is a spherical surface, a curvature radius of the image side surface is R2, and −28 mm<R2<−10 mm; and
the object side surface of the second lens element is an aspheric surface, a curvature radius of the object side surface is R3, and 20 mm<R3<50 mm.
14 . The camera module according to claim 11 , wherein the image side surface of the second lens element is an aspheric surface, a curvature radius of the image side surface is R4, and 10 mm<R4<25 mm.
15 . The camera module according to claim 11 , wherein the object side surface of the third lens element is an aspheric surface, a curvature radius of the object side surface is R5, and −10 mm<R5<−1 mm; and
the image side surface of the third lens element is an aspheric surface, a curvature radius of the image side surface is R6, and −13 mm<R6<−2 mm.
16 . The camera module according to claim 11 , wherein effective focal lengths of the first lens element, the second lens element, and the third lens element are f1, f2, and f3 respectively, satisfying:
8.0 mm<f1<15 mm;
−80 mm<f2<−40 mm; and
−30 mm<f3<−15 mm.
17 . The camera module according to claim 11 , wherein center thicknesses of the first lens element, the second lens element, and the third lens element are CT1, CT2, and CT3 respectively, satisfying:
1 mm<CT1<3 mm;
1 mm<CT2<4 mm; and
1 mm<CT3<4 mm.
18 . The camera module according to claim 11 , wherein the optical lens further comprises an aperture, wherein the aperture is disposed between the first lens element and the second lens element.
19 . The camera module according to claim 11 , wherein the optical lens further comprises:
an infrared filter, wherein the infrared filter is disposed on an image side of the third lens element; and/or,
a prism, wherein the prism is disposed on the image side of the third lens element and is used to change a direction of light.
20 . An electronic device, comprising the camera module according to claim 11 .