Optical imaging system
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsHo Sik YOO, Dong Shin YANG, Yong Joo JO, Sot Eum SEO
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Abstract
An optical imaging system includes: a first lens having a concave image-side surface; a second lens having refractive power; a third lens having a concave image-side surface; a fourth lens having a concave object-side surface or a convex image-side surface; a fifth lens having refractive power; a sixth lens having a concave image-side surface; and a seventh lens having negative refractive power. The first to seventh lenses are sequentially disposed from an object side and 1.62<(N2+N5+N6)/3, where N2 is a refractive index of the second lens, N5 is a refractive index of the fifth lens, and N6 is a refractive index of the sixth lens.
Claims16
An optical imaging system comprising:
- a first lens comprising a concave image-side surface;
- a second lens comprising refractive power;
- a third lens comprising a concave image-side surface;
- a fourth lens comprising a convex object-side surface or a convex image-side surface;
- a fifth lens comprising refractive power;
- a sixth lens comprising a concave image-side surface;
- and
- a seventh lens comprising negative refractive power,
- wherein the first to seventh lenses are sequentially disposed from an object side, and
- wherein 1.62<(N2+N5+N6)/3, where N2 is a refractive index of the second lens, N5 is a refractive index of the fifth lens, and N6 is a refractive index of the sixth lens.
An optical imaging system comprising:
- a first lens comprising a concave image-side surface;
- a second lens comprising refractive power;
- a third lens comprising a concave image-side surface;
- a fourth lens comprising refractive power;
- a fifth lens comprising refractive power;
- a sixth lens comprising a concave image-side surface;
- and
- a seventh lens comprising negative refractive power, and an inflection point formed on an image-side surface thereof,
- wherein the first to seventh lenses are sequentially disposed from an object side, and
- wherein f-number of the optical imaging system <1.8 and −0.75<f1/f2<−0.3, where f1 is a focal length of the first lens, and f2 is a focal length of the second lens.
Dependencies are inferred from the claim text.