Optical lens
An optical lens is provided. The optical lens having an optical axis comprises, in order from an object side to an image-forming side, a first lens having negative refraction power, a second lens having positive refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having refraction power. The sixth lens has an inflection point on a surface toward the image-forming side, the inflection point is separated from an optical axis by a distance h13, the radius of the sixth lens is H3, and |h13/H13|≤0.55.
1. An optical lens having an optical axis and comprising:
a first lens having negative refractive power;
a second lens having positive refractive power;
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 refractive power, an image-side surface of the sixth lens has an infection point, a distance between the infection point and the optical axis is h13, a radius of the sixth lens is H13, and |h13/H13|≤0.55.
2. The optical lens according to claim 1 , wherein the first lens has an Abbe number V1, the second lens has an Abbe number V2, and 50≤V1 and/or V2≤45.
3. The optical lens according to claim 1 , wherein F12 is a total focal length of the first lens and the second lens, F34 is a total focal length of the third lens and the fourth lens, D34 is a distance between an image-side surface of the third lens and an object-side surface of the fourth lens, and 40≤|F12+F34−D34| and/or |F12+F34−D34|≤55.
4. The optical lens according to claim 1 , wherein the third lens has a focal length F3, the fourth lens has a focal length F4, and 0.9≤|F3/F4|.
5. The optical lens according to claim 1 , wherein the fourth lens has a central thickness T41, the fourth lens has an edge thickness T42, T42/T41=C4, and C4≤3.0.
6. The optical lens according to claim 1 , wherein a central thickness of the sixth lens is T6, and T6≤0.55 mm.
7. The optical lens according to claim 1 , wherein the optical lens satisfies at least one of the following conditions: the first lens is a convex-concave lens, the second lens is a double convex lens, the third lens is a double convex lens, the fourth lens is a double concave lens, the fifth lens is a double convex lens, the sixth lens is a double concave lens, the second lens is a spherical lens, at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspheric lens or a free-form lens, the second lens is a glass lens, and at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is a plastic lens.
8. An optical lens having an optical axis and comprising:
a first lens having negative refractive power;
a second lens having positive refractive power;
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 refractive power, an image-side surface of the sixth lens has an infection point, an extending distance between an intersection point of the image-side surface of the sixth lens and the optical axis and a projected position of the infection point on the optical axis is δ13, a distance between the image-side surface of the sixth lens and an imaging plane along the optical axis is BF, and |δ13/BF|≤1.0.
9. The optical lens according to claim 8 , wherein the first lens has an Abbe number V1, the second lens has an Abbe number V2, and 50≤V1 and/or V2≤45.
10. The optical lens according to claim 8 , wherein F12 is a total focal length of the first lens and the second lens, F34 is a total focal length of the third lens and the fourth lens, D34 is a distance between an image-side surface of the third lens and an object-side surface of the fourth lens, and 40≤|F12+F34−D34| and/or |F12+F34−D34|≤55.
11. The optical lens according to claim 8 , wherein the third lens has a focal length F3, the fourth lens has a focal length F4, and 0.9≤|F3/F4|.
12. The optical lens according to claim 8 , wherein the fourth lens has a central thickness T41, the fourth lens has an edge thickness T42, T42/T41=C4, and C4≤3.0.
13. The optical lens according to claim 8 , wherein a distance between the infection point and the optical axis is h13, a radius of the sixth lens is H13 and a central thickness of the sixth lens is T6, and the optical lens satisfies |h13/H13|≤0.55 and/or T6≤0.55 mm.
14. The optical lens according to claim 8 , wherein the optical lens satisfies at least one of the following conditions: the first lens is a convex-concave lens, the second lens is a double convex lens, the third lens is a double convex lens, the fourth lens is a double concave lens, the fifth lens is a double convex lens, the sixth lens is a double concave lens, the second lens is a spherical lens, at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspheric lens or a free-form lens, the second lens is a glass lens, and at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is a plastic lens.
15. An optical lens, in order from an object side to an image-forming side comprising:
a first lens having negative refractive power;
a second lens having positive refractive power, wherein the second lens has an Abbe number V2, and V2≤45;
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 refractive power, a central thickness of the sixth lens is T6, and T6≤0.55 mm.
16. The optical lens according to claim 15 , wherein the first lens has an Abbe number V1, and 50≤V1.
17. The optical lens according to claim 15 , wherein F12 is a total focal length of the first lens and the second lens, F34 is a total focal length of the third lens and the fourth lens, D34 is a distance between an image-side surface of the third lens and an object-side surface of the fourth lens, and 40≤|F12+F34−D34| and/or |F12+F34−D34|≤55.
18. The optical lens according to claim 15 , wherein the third lens has a focal length F3, the fourth lens has a focal length F4, and 0.9≤|F3/F4|.
19. The optical lens according to claim 15 , wherein the fourth lens has a central thickness T41, the fourth lens has an edge thickness T42, T42/T41=C4, and C4≤3.0.
20. The optical lens according to claim 15 , wherein the optical lens satisfies at least one of the following conditions: the first lens is a convex-concave lens, the second lens is a double convex lens, the third lens is a double convex lens, the fourth lens is a double concave lens, the fifth lens is a double convex lens, the sixth lens is a double concave lens, the second lens is a spherical lens, at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspheric lens or a free-form lens, the second lens is a glass lens, and at least one of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens is a plastic lens.