Photographing lens
AssigneeSamsung Electronics Co., Ltd.
InventorYoung-Woo Park
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions: L T f ≤ 1.2 0.5 ≤ f 3 f ≤ 1.0 where LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3 denotes the focal length of the third lens.
Claims14
A photographing lens comprising, in order from an object side:
- a first lens having a positive refractive power and a convex surface facing the object side;
- a second lens, separate from the first lens, having a negative refractive power;
- a third lens having a positive refractive power, aspheric surfaces on both sides, and a concave surface on the object side;
- and
- a fourth lens having a negative refractive power and at least one aspheric surface surfaces on both sides,
- the photographing lens satisfying the following conditional expressions:
- 0.75
- <
- f
- 1
- /
- f
- <
- 2.0
- L
- T
- f
- ≤
- 1.2
- 0.5
- ≤
- f
- 3
- f
- ≤
- 1.0
- wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens;
- f denotes the total focal length of the photographing lens;
- f1 denotes the focal length of the first lens;
- and f3 denotes the focal length of the third lens.
A photographing lens comprising, in order from an object side:
- a first lens having a positive refractive power, a convex surface facing the object side, and aspheric surfaces on both sides;
- a second lens having a negative refractive power;
- a third lens having a positive refractive power and a concave surface on the object side;
- and
- a fourth lens having a negative refractive power and aspheric surfaces on both sides, the photographing lens satisfying the following conditional expressions:
- 0.75<f1/f<2.0
- L
- T
- f
- ≤
- 1.2
- 0.5
- ≤
- f
- 3
- f
- ≤
- 1.0
- wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens;
- f denotes the total focal length of the photographing lens;
- f1 denotes the focal length of the first lens;
- and f3 denotes the focal length of the third lens.
A photographing lens comprising, in order from an object side:
- a first lens having a positive refractive power and a convex surface facing the object side;
- a second lens having a negative refractive power;
- a third lens having a positive refractive power;
- and
- a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:
- 0.85
- <
- f
- 1
- /
- f
- <
- 2.0
- L
- T
- f
- ≤
- 1.2
- 0.5
- ≤
- f
- 3
- f
- ≤
- 1.0
- wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens;
- f denotes the total focal length of the photographing lens;
- f1 denotes the focal length of the first lens;
- and f3 denotes the focal length of the third lens.
Dependencies are inferred from the claim text.