Optical system

Patent metadata

Field	Value
Publication number	US-10114195-B2
Application number	US-201514643253-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Oct 16, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

An optical system includes a first lens having negative refractive power and having two concave surfaces, a second lens having positive refractive power, a third lens having refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having refractive power. The first to seventh lenses are sequentially disposed from an object side.

First claim

What is claimed is:

1. An optical system comprising:
a first lens having negative refractive power and having two concave surfaces;
a second lens having positive refractive power, wherein both surfaces of the second lens are convex;
a third lens having positive refractive power and having meniscus shape in which an object-side surface of the third lens is convex;
a fourth lens having refractive power;
a fifth lens having refractive power;
a sixth lens having refractive power; and
a seventh lens having refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side, the second lens among the first to seventh lenses has a second largest effective radius and
the seventh lens has at least one inflection point formed on at least one of an object-side surface and an image-side surface of the seventh lens.

2. The optical system of claim 1 , wherein the fourth lens has positive refractive power.

3. The optical system of claim 1 , wherein both surfaces of the fourth lens are convex.

4. The optical system of claim 1 , wherein the fifth lens has negative refractive power.

5. The optical system of claim 1 , wherein the fifth lens has a meniscus shape in which an image-side surface of the fifth lens is convex.

6. The optical system of claim 1 , wherein the sixth lens has positive refractive power.

7. The optical system of claim 1 , wherein both surfaces of the sixth lens are convex.

8. The optical system of claim 1 , wherein the seventh lens has negative refractive power.

9. The optical system of claim 1 , wherein the seventh lens has a meniscus shape in which an object-side surface of the seventh lens is convex.

10. The optical system of claim 1 , further comprising a stop disposed between the fourth and fifth lenses.

11. The optical system of claim 1 , wherein the fourth to seventh lenses are provided as plastic lenses.

12. The optical system of claim 1 , wherein all respective surfaces of the first to seventh lenses are aspherical.

13. An optical system comprising:
a first lens having negative refractive power and having two concave surfaces;
a second lens having refractive power;
a third lens having positive refractive power and having meniscus shape in which an object-side surface of the third lens is convex;
a fourth lens having refractive power;
a fifth lens having negative refractive power, wherein the fifth lens has a meniscus shape in which an image-side surface of the fifth lens is convex;
a sixth lens having refractive power; and
a seventh lens having refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side,
the second lens among the first to seventh lenses has a second largest effective radius, and
the seventh lens has at least one inflection point formed on at least one of an object-side surface and an image-side surface of the seventh lens.

14. The optical system of claim 13 , wherein the fourth lens has positive refractive power and two convex surfaces.

15. The optical system of claim 13 , wherein the sixth lens has positive refractive power and two convex surfaces.

16. The optical system of claim 13 , wherein the seventh lens has negative refractive power and has a meniscus shape in which an object-side surface of the seventh lens is convex.

17. The optical system of claim 13 , further comprising a stop disposed between the fourth and fifth lenses.

18. An optical system comprising:
a first lens having negative refractive power and having two concave surfaces;
a second lens having positive refractive power;
a third lens having positive refractive power and having meniscus shape in which an object-side surface of the third lens is convex;
a fourth lens having refractive power;
a fifth lens having refractive power;
a sixth lens having refractive power; and
a seventh lens having negative refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side, the second lens among the first to seventh lenses has a second largest effective radius, and
the seventh lens has at least one inflection point formed on at least one of an object-side surface and an image-side surface of the seventh lens.

Assignees

• Samsung Electro Mech

Inventors

• Son Ju Hwa

Classifications

• G02B9/64 Primary

  having more than six components · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/04

  Reversed telephoto objectives · CPC title

• G03B9/02

  Diaphragms · CPC title

• G02B1/041

  Lenses · CPC title