Large caliber standard lens
AssigneeSamsung Electronics Co., Ltd.
InventorMin Heu
Life of this patent
Estimating the term…
Abstract
A large caliber standard lens having a first lens of a positive refractive power; a second lens of a negative refractive power; a diaphragm; a third lens of a negative refractive power; a fourth lens of a positive refractive power; and a fifth lens of a positive refractive power, wherein the lenses are arranged sequentially from an object side to an image side, and the first lens, the second lens, the third lens, and the fourth lens are meniscus lenses having concave surfaces facing the diaphragm and satisfy the following inequality, 0.6 ≤ R 6 R 4 ≤ 1.0 where R4 represents the radius of curvature of the surface of the second lens facing the image, and R6 represents the radius of curvature of the surface of the third lens facing the object.
Claims5
A fixed focal length lens system comprising:
- a first lens of a positive refractive power;
- a second lens of a negative refractive power;
- an aperture diaphragm;
- a third lens of a negative refractive power;
- a fourth lens of a positive refractive power;
- and
- a fifth lens of a positive refractive power;
- wherein:
- the first lens, the second lens, the diaphragm, the third lens, the fourth lens, and the fifth lens are arranged sequentially from an object side to an image side;
- the first lens, the second lens, the third lens, and the fourth lens are meniscus lenses having concave surfaces facing the diaphragm;
- and
- the following inequalities are satisfied:
- 0.6
- ≤
-
- R
- 6
- R
- 4
-
- ≤
- 1.0
- where R4 denotes the radius of curvature of the surface of the second lens facing the image side, and R6 is the radius of curvature of the surface of the third lens facing the object;
- and
- 1.1
- ≤
- R
- 7
- R
- 8
- <
- 3.5
- where R7 represents the radius of curvature of the surface of the third lens facing the image side, and R8 represents the radius of curvature of the surface of the fourth lens facing the object side;
- wherein when refractive indexes of the third lens, the fourth lens, and the fifth lens are n3, n4, n5, respectively, the following inequality is satisfied:
- 1.80<(n3+n4+n5)/3.
A fixed focal length lens system comprising:
- a first lens of a positive refractive power;
- a second lens of a negative refractive power;
- an aperture diaphragm;
- a third lens of a negative refractive power;
- a fourth lens of a positive refractive power;
- and
- a fifth lens of a positive refractive power;
- wherein:
- the first lens, the second lens, the diaphragm, the third lens, the fourth lens, and the fifth lens are arranged sequentially with no intervening lens elements from an object side to an image side;
- the first lens, the second lens, the third lens, and the fourth lens are meniscus lenses having concave surfaces facing the diaphragm;
- and
- the following inequalities are satisfied:
- 0.6
- ≤
-
- R
- 6
- R
- 4
-
- ≤
- 1.0
- where R4 denotes the radius of curvature of the surface of the second lens facing the image side, and R6 is the radius of curvature of the surface of the third lens facing the object;
- and
- 1.1
- ≤
- R
- 7
- R
- 8
- <
- 3.5
- where R7 represents the radius of curvature of the surface of the third lens facing the image side, and R8 represents the radius of curvature of the surface of the fourth lens facing the object side,
- wherein the average value of the refractive indexes of the lenses that are located between the diaphragm and the image side is greater than the average value of the refractive indexes of the lenses that are located between the diaphragm and the object side.
Dependencies are inferred from the claim text.