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US 10,481,365 B2Granted
Optical system
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorIl Yong Park
Life of this patent
Estimating the term…
Abstract
An optical system includes a first lens including a positive refractive power, a second lens including a positive refractive power and a convex image-side surface, a third lens, and a fourth lens. The optical system includes a fifth lens including a concave object-side surface and a concave image-side surface, and a sixth lens including an inflection point formed on an image-side surface thereof. The first to sixth lenses are sequentially disposed from an object toward an imaging plane.
Claims20
An optical system, comprising:
- a first lens comprising a positive refractive power;
- a second lens comprising a positive refractive power and a convex image-side surface in a paraxial region;
- a third lens;
- a fourth lens;
- a fifth lens comprising a concave object-side surface in a paraxial region and a concave image-side surface in the paraxial region;
- and
- a sixth lens comprising an inflection point formed on an image-side surface thereof,
- wherein the first to sixth lenses are sequentially disposed from an object toward an imaging plane,
- f, an overall focal length of the optical system, and f1, a focal length of the first lens, satisfy 1.0<f1/f<1.8,
- f, and f5 a focal length of the fifth lens, satisfy f5/f<−10;
- f2, a focal length of the second lens, and, f3, a focal length of the third lens satisfy −1.2<f2/f3<0, and
- f, and r10, a radius of curvature of an image-side surface of the fifth lens, satisfy 30<r10/f.
9 more elements
An optical system, comprising:
- a first lens comprising a positive refractive power;
- a second lens comprising a convex image-side surface in a paraxial region;
- a third lens comprising a convex object-side surface in the paraxial region;
- a fourth lens comprising a convex image-side surface in the paraxial region;
- a fifth lens comprising a concave object-side surface in the paraxial region and a concave image-side surface in the paraxial region;
- and
- a sixth lens comprising an inflection point formed on an image-side surface thereof,
- wherein the first to sixth lenses are sequentially disposed from an object toward an imaging plane,
- f, an overall focal length of the optical system, and f1, a focal length of the first lens, satisfy 1.0<f1/f<1.8,
- f, and f5 a focal length of the fifth lens, satisfy f5/f<−10;
- f2, a focal length of the second lens, and, f3, a focal length of the third lens satisfy −1.2<f2/f3<0,
- f, and r10, a radius of curvature of an image-side surface of the fifth lens, satisfy 30<r10/f.
9 more elements
An optical system, comprising:
- a first lens;
- a second lens comprising a convex image-side surface in a paraxial region;
- a third lens comprising a convex object-side surface in the paraxial region;
- a fourth lens comprising a convex image-side surface in the paraxial region;
- a fifth lens comprising a concave object-side surface in the paraxial region and a concave image-side surface in the paraxial region;
- and
- a sixth lens comprising an inflection point formed on an image-side surface thereof, wherein
- the second lens has a same refractive index as a refractive index of the first lens,
- the third lens, the fourth lens, and the fifth lens have a refractive index higher than the refractive indexes of the first and second lenses, and
- the sixth lens has a refractive index lower than the refractive indexes of the first and second lenses,
- f, an overall focal length of the optical system, and f1, a focal length of the first lens, satisfy 1.0<f1/f<1.8,
- f, and f5 a focal length of the fifth lens, satisfy f5/f<−10;
- f2, a focal length of the second lens, and, f3, a focal length of the third lens satisfy −1.2<f2/f3<0, and
- f, and r10, a radius of curvature of an image-side surface of the fifth lens, satisfy 30<r10/f.
11 more elements
Dependencies are inferred from the claim text.