Photographing lens system and photographing apparatus having the same
A photographing lens system and a photographing apparatus including the photographing lens system are provided. The photographing lens system may include a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative or positive refractive power, a fifth lens having a negative refractive power, and a sixth lens having a negative or positive refractive power. The first to sixth lenses may be sequentially arranged in a direction from an object side to an image side.
1. A photographing lens system comprising:
a first lens having a negative refractive power;
a second lens comprising an object-side surface convex toward an object side, the second lens having a positive refractive power;
a third lens comprising an image-side surface concave toward an image side, the third lens having a negative refractive power;
a fourth lens having a negative or positive refractive power;
a fifth lens having a negative refractive power; and
a sixth lens comprising an image-side surface concave toward the image side, the sixth lens having a negative or positive refractive power,
wherein the first to sixth lenses are sequentially arranged in a direction from the object side to the image side, and
wherein the photographing lens system satisfies the following expressions:
Vd 3<30; and
Vd 4<30,
wherein Vd3 refers to an Abbe number of the third lens, and Vd4 refers to an Abbe number of the fourth lens.
2. The photographing lens system of claim 1 , wherein the photographing lens system satisfies the following expression:
0.65<TTL/DI<0.8,
wherein TTL is a distance from an object-side surface of the first lens to an image sensor, and DI refers to a diagonal length of the image sensor.
3. The photographing lens system of claim 1 , wherein the photographing lens system satisfies the following expression:
70°<FOV<80°,
wherein FOV is a field of view.
4. The photographing lens system of claim 1 , wherein the photographing lens system satisfies the following expression:
1.2<TTL/CT<1.8,
wherein TTL refers to a distance from an object-side surface of the first lens to an image sensor, and CT refers to a sum of center thicknesses of the first to sixth lenses measured along an optical axis.
5. The photographing lens system of claim 1 , wherein the photographing lens system satisfies the following expression:
1.4< f/f 2<1.8,
wherein f denotes a focal length of the photographing lens system, and f2 denotes a focal length of the second lens.
6. The photographing lens system of claim 1 , wherein the refractive index of the third lens and the refractive index of the fourth lens are equal to or greater than 1.64.
7. The photographing lens system of claim 1 , further comprising at least one aperture stop disposed between an object-side surface of the first lens and the third lens.
8. The photographing lens system of claim 1 , wherein each of the first to sixth lenses comprises at least one aspheric surface.
9. The photographing lens system of claim 1 , wherein each of the first to sixth lenses comprises a plastic lens.
10. The photographing lens system of claim 1 , wherein the image-side surface of the sixth lens has at least one inflection point.
11. The photographing lens system of claim 1 , wherein the first lens has a meniscus shape convex toward the object side.
12. A photographing lens system comprising:
a first lens having a negative refractive power;
a second lens having a positive refractive power;
a third lens having a negative refractive power;
a fourth lens having a negative or positive refractive power;
a fifth lens having a negative refractive power; and
a sixth lens having a negative or positive refractive power, wherein at least one of an object-side surface and an image-side surface of the sixth lens has at least one inflection point,
wherein the first to sixth lenses are sequentially arranged in a direction from an object side to an image side, and the photographing lens system satisfies the following expression:
1.4< f/f 2<1.8,
wherein f denotes a focal length of the photographing lens system, and f2 denotes a focal length of the second lens, and
wherein the photographing lens system satisfies the following expressions:
Vd 3<30;
Vd 4<30; and
0.65<TTL/DI<0.8,
wherein Vd3 refers to an Abbe number of the third lens, Vd4 refers to an Abbe number of the fourth lens, TTL refers to a distance from an object-side surface of the first lens to an image sensor, and DI is a diagonal length of the image sensor.
13. The photographing lens system of claim 12 , wherein the photographing lens system satisfies the following expression:
70°<FOV<80°,
wherein FOV is a field of view.
14. The photographing lens system of claim 12 , wherein the photographing lens system satisfies the following expression:
1.2<TTL/CT<1.8,
wherein TTL is a distance from an object-side surface of the first lens to an image sensor, and CT is a sum of center thicknesses of the first to sixth lenses measured along an optical axis.
15. The photographing lens system of claim 12 , wherein refractive index of the third lens and the refractive index of the fourth lens are equal to or greater than 1.64.
16. The photographing lens system of claim 12 , further comprising at least one aperture stop disposed between an object-side surface of the first lens and the third lens.
17. The photographing lens system of claim 12 , wherein each of the first to sixth lenses comprises at least one aspheric surface.
18. The photographing lens system of claim 12 , wherein each of the first to sixth lenses comprises a plastic lens.
19. The photographing lens system of claim 12 , wherein an image-side surface of the sixth lens has at least one inflection point.
20. A photographing apparatus comprising:
a photographing lens system; and
an image sensor configured to receive an image formed by the photographing lens system and convert the image into an electric image signal,
wherein the photographing lens system comprises:
a first lens having a negative refractive power;
a second lens comprising an object-side surface convex toward an object side, the second lens having a positive refractive power;
a third lens comprising an image-side surface concave toward an image side, the third lens having a negative refractive power;
a fourth lens having a negative or positive refractive power;
a fifth lens having a negative refractive power; and
a sixth lens comprising an image-side surface concave toward the image side, the sixth lens having a negative or positive refractive power,
wherein the first to sixth lenses are sequentially arranged in a direction from the object side to the image side, and
wherein the photographing lens system satisfies the following expressions:
Vd 3<30; and
Vd 4<30,
wherein Vd3 refers to an Abbe number of the third lens, and Vd4 refers to an Abbe number of the fourth lens.