Photographing lens group and electronic apparatus including the same

1. A photographing lens group comprising:

a first lens having a positive refractive power;

a second lens having a negative refractive power;

a third lens having a positive refractive power;

a fourth lens having a positive or negative refractive power;

a fifth lens having a negative refractive power; and

a sixth lens having a positive refractive power, wherein the sixth lens comprises at least one inflection point on at least one of an image side surface or an object side surface thereof;

wherein the first, second, third, fourth, fifth, and sixth lenses are sequentially arranged from an object side to an image side of the photographing lens group;

the third lens is a biconvex lens;

wherein the photographing lens group satisfies an inequality of:

1.0< CT 6 /CT 5 <3.5;

where CT 5 is a thickness of the fifth lens with respect to an optical axis, and CT 6 is a thickness of the sixth lens with respect to the optical axis; and

wherein the photographing lens group satisfies an inequality of:

0.1< TTL/DI< 0.8;

where TTL is a distance from an object side surface of the first lens to an image plane, and DI is a diagonal length of an image sensor.

2. The photographing lens group of claim 1 , wherein an object side surface of the sixth lens is convex near the optical axis.

3. The photographing lens group of claim 1 , wherein the photographing lens group satisfies an inequality of:

0<| f 1 /f 3 |+|f 1 /f 4 |<1.0;

where f 1 is a focal length of the first lens, f 3 is a focal length of the third lens, and f 4 is a focal length of the fourth lens.

4. The photographing lens group of claim 1 , wherein the photographing lens group satisfies an inequality of:

0<| f/f 5 |+|f/f 6 |<1.0;

where f 5 is a focal length of the fifth lens, f 6 is a focal length of the sixth lens, and f is a focal length of the photographing lens group.

5. The photographing lens group of claim 1 , wherein the photographing lens group satisfies an inequality of:

25<| V d4 −V d5 |<50;

where V d4 is an Abbe number of the fourth lens, and V d5 is an Abbe number of the fifth lens.

6. The photographing lens group of claim 1 , wherein the first, second, third, fourth, fifth, and sixth lenses each have at least one aspheric surface.

7. The photographing lens group of claim 1 , wherein the first, second, third, fourth, fifth, and sixth lenses are bi-aspheric lenses.

8. The photographing lens group of claim 1 , wherein the fifth lens has a meniscus shape having a convex surface facing the image side.

9. The photographing lens group of claim 1 , further comprising a stop provided at an object side of the first lens, or between the first lens and the second lens.

10. The photographing lens group of claim 1 , wherein the first lens has a convex surface facing the object side.

11. The photographing lens group of claim 10 , wherein the first lens is a biconvex lens.

12. The photographing lens group of claim 1 , wherein the second lens has a concave surface facing the image side.

13. The photographing lens group of claim 12 , wherein the second lens is a meniscus lens or a biconcave lens.

14. The photographing lens group of claim 1 , wherein an image side surface of the sixth lens is concave near the optical axis.

15. An electronic apparatus comprising:

a photographing lens group; and

an image sensor that receives an image formed by the photographing lens group and converts the image into an electric image signal;

wherein the photographing lens group comprises:

a first lens having a positive refractive power;

a second lens having a negative refractive power;

a third lens having a positive refractive power;

a fourth lens having a positive or negative refractive power;

a fifth lens having a negative refractive power; and

a sixth lens having a positive refractive power, wherein the sixth lens comprises at least one inflection point on at least one of an image side surface or an object side surface thereof;

wherein the first, second, third, fourth, fifth, and sixth lenses are sequentially arranged from an object side to an image side of the photographing lens group;

the third lens is a biconvex lens;

wherein the photographing lens group satisfies an inequality of:

1.0< CT 6 /CT 5 <3.5;

 where CT 5 is a thickness of the fifth lens with respect to an optical axis, and CT 6 is a thickness of the sixth lens with respect to the optical axis; and

 wherein the photographing lens group satisfies an inequality of:

0.1< TTL/DI< 0.8;

 where TTL is a distance from an object side surface of the first lens to an image plane, and DI is a diagonal length of an image sensor.

16. A photographing lens group comprising:

a first lens having a positive refractive power;

a second lens having a negative refractive power;

a third lens having a positive refractive power;

a fourth lens having a positive or negative refractive power;

a fifth lens having a negative refractive power; and

a sixth lens having a positive refractive power, wherein the sixth lens group comprises at least one inflection point on at least one of an image side surface or an object side surface thereof;

wherein the first, second, third, fourth, fifth, and sixth lenses are sequentially arranged from an object side to an image side of the photographing lens group;

wherein the third lens is a biconvex lens; and

wherein the photographing lens group satisfies an inequality of:

1.0< CT 6 /CT 5 <3.5;

where CT 5 is a thickness of the fifth lens with respect to an optical axis, and CT 6 is a thickness of the sixth lens with respect to the optical axis.