Optical imaging system and mobile electronic device
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, sequentially disposed from an object side. The first lens has negative refractive power, an image side surface thereof is concave, and an angle of view of the optical system including the first lens to the sixth lens is 100° or more. When a focal length of the first lens is f1_1, and a total focal length of the optical system including the first lens to the sixth lens is F1, 1.0<|f1_1/F1|<2.0 is satisfied.
1. An optical imaging system comprising:
a first lens having negative refractive power, a concave object-side surface and a concave image-side surface;
a second lens having positive refractive power, a convex object-side surface and a concave image-side surface;
a third lens having positive refractive power;
a fourth lens having negative refractive power;
a fifth lens having positive refractive power; and
a sixth lens having negative refractive power,
wherein the first to sixth lenses are sequentially disposed from an object side,
wherein TTL1/F1>2.0 is satisfied, where TTL1 is a distance from the object side surface of the first lens to an imaging surface, and F1 is a total focal length of the optical imaging system, and
wherein 0.5<R2_1/F1<2.0 is satisfied, where R2_1 is a radius of curvature of the image-side surface of the first lens.
2. The optical imaging system of claim 1 , wherein 1.0<|f1_1/F1|<2.0 is satisfied, where f1_1 is a focal length of the first lens.
3. The optical imaging system of claim 1 , wherein −1.0<f3_1/f1_1<0 is satisfied, where f3_1 is a focal length of the third lens.
4. The optical imaging system of claim 1 , wherein v2_1<26 is satisfied, where v2_1 is an Abbe number of the second lens.
5. The optical imaging system of claim 4 , wherein v1_1−v2_1>30 is satisfied, where v1_1 is an Abbe number of the first lens.
6. The optical imaging system of claim 4 , wherein v2_1+v6_1<v3_1 is satisfied, where v3_1 is an Abbe number of the third lens, and v6_1 is an Abbe number of the sixth lens.
7. The optical imaging system of claim 6 , wherein the Abbe number of the sixth lens is 26 or less.
8. The optical imaging system of claim 6 , wherein AVR(v4_1, v6_1)<24 is satisfied, where AVR(v4_1, v6_1) is an average value of the Abbe number of the fourth lens and the Abbe number of the sixth lens.
9. The optical imaging system of claim 8 , wherein AVR(v3_1, v5_1)>55 is satisfied, where AVR(v3_1, v5_1) is an average value of an Abbe number of the third lens and an Abbe number of the fifth lens.
10. The optical imaging system of claim 1 , wherein an angle of view of the optical imaging system is 100° or more.
11. The optical imaging system of claim 1 , wherein Fno1≤2.4 is satisfied, where Fno1 is a f-number of the optical imaging system.
12. The optical imaging system of claim 1 , wherein the third lens has a convex object-side surface and a convex image-side surface.
13. The optical imaging system of claim 1 , wherein the fourth lens has a convex object-side surface and a concave image-side surface.
14. The optical imaging system of claim 1 , wherein the fifth lens has a convex object-side surface and a convex image-side surface.
15. The optical imaging system of claim 1 , wherein the sixth lens has a convex object-side surface and a concave image-side surface.
16. The optical imaging system of claim 1 , wherein at least one inflection point is formed on the object-side surface of the first lens.
17. The optical imaging system of claim 1 , wherein at least one inflection point is formed on the object-side surface and the image surface of the sixth lens, respectively.
18. The optical imaging system of claim 1 , wherein the first to sixth lenses are formed of a plastic material.
19. The optical imaging system of claim 1 , wherein each surface of the first to sixth lenses is an aspherical surface.
20. The optical imaging system of claim 1 , wherein the optical imaging system has a total of six lenses.