Optical imaging system
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 arranged from an object side to an imaging plane. An angle of view of the optical system is 82 degrees or more. A constant indicating brightness of the optical system, F-number, is less than 1.8.
1. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side to an imaging plane,
wherein an angle of view of the optical system is 82 degrees or more,
wherein a constant indicating brightness of the optical system, F-number, is less than 1.8, and
wherein TTL/Imgh<0.69, where TTL represents a distance from an object-side surface of the first lens to an imaging plane of an image sensor and Imgh represents a diagonal length of the imaging plane of the image sensor.
2. The optical imaging system of claim 1 , wherein R 1 /f<0.42, where R 1 represents a radius of curvature of an object-side surface of the first lens and f represents a total focal length of the optical system.
3. The optical imaging system of claim 1 , wherein R 4 /f<0.65, wherein R 4 represents a radius of curvature of an image-side surface of the second lens and f represents a total focal length of the optical system.
4. The optical imaging system of claim 1 , wherein |f6|>25, where f6 represents a focal length of the sixth lens.
5. The optical imaging system of claim 1 , further comprising a stop disposed between the second lens and the third lens.
6. The optical imaging system of claim 1 , wherein the first lens has a positive refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
7. The optical imaging system of claim 1 , wherein the second lens has a negative refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
8. The optical imaging system of claim 1 , wherein the third lens has a positive refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
9. The optical imaging system of claim 1 , wherein the third lens has a positive refractive power, a convex object-side surface along an optical axis, and a convex image-side surface along the optical axis.
10. The optical imaging system of claim 1 , wherein the fourth lens has a negative refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
11. The optical imaging system of claim 1 , wherein the fifth lens has a positive or negative refractive power, a concave object-side surface along an optical axis, and a convex image-side surface along the optical axis.
12. The optical imaging system of claim 1 , wherein the sixth lens has a positive or negative refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
13. The optical imaging system of claim 1 , wherein v2<21, where v2 represents an Abbe number of the second lens.
14. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side to an imaging side,
wherein an angle of view of the optical system is 82 degrees or more,
wherein a constant indicating brightness of the optical system, F-number, is less than 1.8,
wherein R 1 /f<0.42, where R 1 represents a radius of curvature of an object-side surface of the first lens and f represents a total focal length of the optical system,
wherein an Abbe number of the second lens is less than 21.
15. The optical imaging system of claim 14 , wherein R 4 /f<0.65, where R 4 represents a radius of curvature of an image-side surface of the second lens.
16. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side to an imaging plane,
wherein an angle of view of the optical system is 82 degrees or more,
wherein a constant indicating brightness of the optical system, F-number, is less than 1.8, and
wherein |f6|>25, where f6 represents a focal length of the sixth lens.
17. The optical imaging system of claim 16 , wherein the second lens has a negative refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis.
18. The optical imaging system of claim 16 , wherein the third lens has a positive refractive power, a convex object-side surface along an optical axis, and a convex image-side surface along the optical axis.
19. The optical imaging system of claim 16 , wherein R 1 /f<0.42, where R 1 represents a radius of curvature of an object-side surface of the first lens and f represents a total focal length of the optical system.
20. The optical imaging system of claim 16 , wherein R 4 /f<0.65, wherein R 4 represents a radius of curvature of an image-side surface of the second lens and f represents a total focal length of the optical system.