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US 10,761,300 B2Granted
Optical system
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorHo Sik You
Life of this patent
Estimating the term…
Abstract
An optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens includes an object-side surface that is convex with a meniscus shape. The second lens includes an image-side surface that is convex. The third lens includes an image-side surface that is concave. The fifth lens includes an image-side surface that is concave. The first to sixth lenses are sequentially disposed from an object side to an image side.
Claims20
An optical system, comprising:
- a first lens comprising positive refractive power, an object-side surface that is convex with a meniscus shape, and an image-side surface that is concave;
- a second lens comprising an object-side surface that is convex and an image-side surface that is convex;
- a third lens comprising negative refractive power, an object-side surface that is convex, and an image-side surface that is concave;
- a fourth lens comprising positive refractive power, an object-side surface that is convex, and an image-side surface that is convex;
- a fifth lens comprising negative refractive power, an object-side surface that is convex, and an image-side surface that is concave;
- a sixth lens,
- wherein the first to sixth lenses are sequentially disposed from an object side to an image side;
- and
- an image sensor configured to convert an image of a subject incident through the first through sixth lenses into an electrical signal,
- wherein TTL is a distance from the object-side surface of the first lens to an imaging surface of the image sensor and f is an overall focal length of the optical system satisfying 0.95<TTL/f<1.45,
- wherein, f34, a synthetic focal length of the third and fourth lenses satisfies −2.5<f/f34<−0.2,
- wherein among the first to sixth lenses, the fifth lens has a largest absolute focal length value,
- wherein among the first to sixth lenses, the fourth lens has a second largest absolute focal length value,
- wherein each of the fifth lens and the sixth lens has a thickness greater than a thickness of each of the first lens, the second lens, the third lens, and the fourth lenses along an optical axis, and
- wherein, r9, a radius of curvature of the object-side surface of the fifth lens and, r10, a radius of curvature of the image-side surface of the fifth lens satisfy 0<(r9−r10)/(r9+r10)<2.5.
12 more elements
An optical system, comprising:
- a first lens comprising positive refractive power, an object-side surface that is convex, and an image-side surface that is concave;
- a second lens comprising an object-side surface that is convex and an image-side surface that is convex;
- a third lens comprising negative refractive power, an object-side surface that is convex, and an image-side surface that is concave;
- a fourth lens comprising positive refractive power, an object-side surface that is convex, and an image-side surface that is convex;
- a fifth lens comprising negative refractive power, an object-side surface that is convex, and an image-side surface that is concave;
- a sixth lens comprising refractive power,
- wherein the first through sixth lenses are sequentially arranged from an object side to an image side;
- and
- an image sensor configured to convert an image of a subject incident through the first through sixth lenses into an electrical signal,
- wherein, ImgH, half a diagonal length of the imaging surface of the image sensor is at least 3.43 mm,
- wherein, f, an overall focal length of the optical system, and, f34, a synthetic focal length of the third and fourth lenses satisfy −2.5<f/f34<−0.2,
- wherein among the first to sixth lenses, the fifth lens has a largest absolute focal length value,
- wherein among the first to sixth lenses, the fourth lens has a second largest absolute focal length value,
- wherein each of the fifth lens and the sixth lens has a thickness greater than a thickness of each of the first lens, the second lens, the third lens, and the fourth lenses along an optical axis, and
- wherein, r9, a radius of curvature of the object-side surface of the fifth lens and, r10, a radius of curvature of the image-side surface of the fifth lens satisfy 0<(r9−r10)/(r9+r10)<2.5.
12 more elements
Dependencies are inferred from the claim text.