Optical system

Patent metadata

Field	Value
Publication number	US-2016161719-A1
Application number	US-201514951945-A
Country	US
Kind code	A1
Filing date	Nov 25, 2015
Priority date	Dec 5, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

An optical system includes: a first lens having negative refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and an image sensor configured to convert an image of a subject incident through the first to sixth lenses into electrical signals, wherein the first to sixth lenses are sequentially disposed from an object side of the optical system, and wherein TTL/(ImgH*2)≦0.75 is satisfied, with TTL being a distance from an object-side surface of the first lens to an image plane of the image sensor and ImgH being half of a diagonal length of the image plane of the image sensor.

First claim

What is claimed is:

1 . An optical system comprising:
a first lens having negative refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and an image sensor configured to convert an image of a subject incident through the first to sixth lenses into electrical signals, wherein the first to sixth lenses are sequentially disposed from an object side of the optical system, and wherein TTL/(ImgH*2)≦0.75 is satisfied, with TTL being a distance from an object-side surface of the first lens to an image plane of the image sensor and ImgH being half of a diagonal length of the image plane of the image sensor.

2 . The optical system of claim 1 , wherein the first to third lenses have positive or negative refractive power in an alternating sequence toward the object side of the optical system.

3 . The optical system of claim 2 , wherein a gap between the first and second lenses and a gap between the second and third lenses in a paraxial region are narrower than a gap between lenses, among the third to sixth lenses, in the paraxial region.

4 . The optical system of claim 1 , wherein TTL/(ImgH*2)≦0.68 is satisfied.

5 . The optical system of claim 1 , wherein −5<f1/EFL<−4.6 is satisfied, with f1 being a focal length of the first lens and EFL being an entire focal length of the optical system including the first to sixth lenses.

6 . The optical system of claim 1 , wherein 2.3<f1/f3<2.6 is satisfied, with f1 being a focal length of the first lens and f3 being a focal length of the third lens.

7 . The optical system of claim 1 , wherein BFL/EFL<0.31 is satisfied, with BFL being a distance from an image-side surface of the sixth lens to the image plane of the image sensor and EFL being an entire focal length of the optical system including the first to sixth lenses.

8 . The optical system of claim 1 , wherein 0.95<ER1/ER6<1.05 is satisfied, with ER1 being an effective radius of the object-side surface of the first lens and ER6 being an effective radius of an image-side surface of the third lens.

9 . The optical system of claim 1 , wherein 79<FOV<83 is satisfied, with FOV being a field of view of the optical system.

10 . The optical system of claim 1 , wherein the object-side surface of the first lens is convex in a paraxial region.

11 . The optical system of claim 1 , wherein the second lens comprises positive refractive power.

12 . The optical system of claim 1 , wherein the fifth lens comprises positive refractive power.

13 . The optical system of claim 1 , wherein the sixth lens comprises negative refractive power.

14 . The optical system of claim 1 , wherein the sixth lens comprises at least one inflection point on at least one of an object-side surface or an image-side surface thereof.

15 . An optical system comprising:
a first lens; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, wherein the first to sixth lenses are sequentially disposed from an object side, and wherein a sum of a gap between the first and second lenses in a paraxial region and a gap between the second and third lenses in the paraxial region is less than a gap between lenses, among the third to sixth lenses, in the paraxial region.

16 . The optical system of claim 15 , wherein the second lens comprises positive refractive power, and the third lens comprises negative refractive power.

17 . The optical system of claim 15 , wherein:
the second lens comprises positive refractive power; and |r4/r3|>20 is satisfied, with r3 being a radius of curvature of an object-side surface of the second lens and r4 being a radius of curvature of an image-side surface of the second lens.

18 . An optical system comprising:
a first lens comprising negative refractive power; a second lens; a third lens comprising negative refractive power; a fourth lens comprising a meniscus shape of which an image-side surface is convex in a paraxial region; a fifth lens comprising a meniscus shape of which an image-side surface is convex in the paraxial region; and a sixth lens, wherein the first to sixth lenses are sequentially disposed from an object side, and wherein a gap between the first and second lenses in the paraxial region and a gap between the second and third lenses in the paraxial region are narrower than a gap between lenses, among the third to sixth lenses, in the paraxial region.

19 . An optical system comprising:
lenses arranged from an object side to an image side, and comprising
a first lens comprising negative refractive power,
a second lens,
a third lens comprising negative refractive power; and
an image sensor configured to convert an image of a subject incident through the lenses into electrical signals, wherein −5<f1/EFL<−4.6 is satisfied, with f1 being a focal length of the first lens and EFL being an entire focal length of the optical system.

20 . The optical system of claim 19 , wherein 2.3<f1/f3<2.6 is satisfied, with f3 being a focal length of the third lens.

21 . The optical system of claim 19 , wherein TTL/(ImgH*2)≦0.75 is satisfied, with TTL being a distance from an object-side surface of the first lens to an image plane of the image sensor and ImgH being half of a diagonal length of the image plane of the image sensor.

22 . The optical system of claim 19 , wherein 79<FOV<83 is satisfied, with FOV being a field of view of the optical system.

23 . An optical system comprising lenses, the lenses comprising:
a first lens; a second lens disposed further from an object side of the optical system than the first lens; a third lens disposed further from the object side of the optical system than the second lens; and other lenses disposed further from the object side of the optical system than the third lens, wherein at least one of a gap between the first and second lenses and a gap between the second and third lenses in a paraxial region is narrower than gaps between lenses, among the third lens and the other lenses, in the paraxial region.

24 . The optical image system of claim 23 , further comprising an image sensor configured to convert an image of a subject incident through the lenses into electrical signals, wherein:
the other lenses comprise
a fourth lens,
a fifth lens disposed further from the object side of the optical system than the fourth lens, and
a sixth lens disposed further from the object side of the optical system than the fifth lens; and
BFL/EFL<0.31 is satisfied, with BFL being a distance from an image-side surface of the sixth lens to an image plane of the image sensor and EFL being an entire focal length of the optical system including the first to sixth lenses.

25 . The optical image system of claim 24 , wherein TTL/(ImgH*2)≦0.75 is satisfied, with TTL being a distance from an object-side surface of the first lens to an image plane of the image sensor and ImgH being half of a diagonal length of the image plane of the image sensor.

26 . The optical system of claim 25 , wherein 79<FOV<83 is satisfied, with FOV being a field of view of the optical system.

Assignees

• Samsung Electro Mech

Inventors

• Son Ju Hwa

Classifications

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/62 Primary

  having six components only · CPC title

• H04N5/2254

  Electricity · mapped topic

• H04N5/2253

  Electricity · mapped topic