Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9435986-B2
Application number	US-201514934112-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Jul 6, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An optical image capturing system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first, the second and the third lens elements all have refractive power. The fourth lens element with refractive power has both surfaces being aspheric. The fifth lens element with refractive power has both surfaces being aspheric. The sixth lens element with refractive power has an image-side surface having at least one convex shape at a peripheral region thereof and both surfaces being aspheric. The seventh lens element with refractive power has an image-side surface having at least one convex shape at a peripheral region thereof, wherein both surfaces being aspheric, and at least one surface has at least one inflection point thereon.

First claim

What is claimed is:

1. An optical image capturing system comprising, in order from an object side to an image side thereof, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, wherein each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
the first lens element with positive refractive power having at least one convex shape at a peripheral region of the object-side surface thereof;
the second lens element having negative refractive power;
the third lens element having the object-side surface and the image-side surface thereof being both aspheric;
the fourth lens element having the object-side surface and the image-side surface thereof being both aspheric;
the fifth lens element having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the fifth lens element are both aspheric;
the sixth lens element with positive refractive power having at least one convex shape at a peripheral region of the image-side surface thereof, wherein the object-side surface and the image-side surface of the sixth lens element are both aspheric; and
the seventh lens element with negative refractive power having the image-side surface being concave at a paraxial region thereof, wherein the image-side surface of the seventh lens element changes from concave at a paraxial region thereof to convex at a peripheral region thereof, and the object-side surface and the image-side surface of the seventh lens element are both aspheric;
wherein the optical image capturing system has a total of seven lens elements, each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is a single and non-cemented lens element, and the optical image capturing system further comprises an aperture stop, the aperture stop is positioned on the object side of the third lens element, a focal length of the optical image capturing system is f, a curvature radius of the image-side surface of the seventh lens element is R14, a vertical distance from a critical point on the image-side surface of the seventh lens element to an axial vertex on the image-side surface of the seventh lens element is Yc72, and the following relationships are satisfied:
0.1< R 14/ f< 1.0; and
0.1< Yc 72/ f< 0.9.

2. The optical image capturing system of claim 1 , wherein the sixth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof.

3. The optical image capturing system of claim 1 , wherein both of the object-side surface and the image-side surface of the first lens element and the second lens element are aspheric, and the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are made of plastic materials.

4. The optical image capturing system of claim 1 , wherein the image-side surface of the third lens element has at least one convex shape at a peripheral region thereof.

5. The optical image capturing system of claim 1 , wherein the object-side surface of the fourth lens element has at least one concave shape at a peripheral region thereof, and the image-side surface of the fourth lens element has at least one convex shape at a peripheral region thereof.

6. The optical image capturing system of claim 1 , wherein the object-side surface of the fifth lens element has at least one concave shape at a peripheral region thereof.

7. The optical image capturing system of claim 1 , wherein the object-side surface of the sixth lens element has at least one concave shape at a peripheral region thereof.

8. The optical image capturing system of claim 1 , wherein the fifth lens element has the image-side surface being convex at a paraxial region thereof, and both of the object-side surface and the image-side surface of the seventh lens element have at least one inflection point thereon.

9. The optical image capturing system of claim 1 , wherein the first lens element has the object-side surface being convex at a paraxial region thereof, and the second lens element has the image-side surface being concave at a paraxial region thereof.

10. The optical image capturing system of claim 1 , wherein the sixth lens element has the image-side surface being convex at a paraxial region thereof.

11. The optical image capturing system of claim 1 , wherein the seventh lens element has the object-side surface being convex at a paraxial region thereof.

12. The optical image capturing system of claim 1 , wherein the aperture stop is positioned on the object side of the second lens element.

13. The optical image capturing system of claim 12 , wherein the aperture stop is positioned on the object side of the first lens element.

14. The optical image capturing system of claim 1 , wherein a maximum image height of the optical image capturing system is ImgH, an axial distance between the object-side surface of the first lens element and an image plane is TTL, and the following relationship is satisfied:
1.00< TTL/ImgH< 1.70.

15. The optical image capturing system of claim 1 , wherein a minimum central thickness of a lens element among the seven lens elements of the optical image capturing system is CTmin, and the following relationship is satisfied:
CTmin<0.30 mm.

16. The optical image capturing system of claim 1 , wherein a curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, and the following relationship is satisfied:
−5.0< R 14/ R 13<1.0.

17. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following relationship is satisfied:
| f/f 3|+| f/f 4|<1.0.

18. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following relationship is satisfied:
1.8<| f/f 6|+| f/f 7|<6.0.

19. The optical image capturing system of claim 1 , wherein a maximal field of view of the optical image capturing system is FOV, and the following relationship is satisfied:
72 degrees≦FOV≦95 degrees.

20. The optical image capturing system of claim 1 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationship is satisfied:
28< V 1− V 2<42.

21. The optical image capturing system of claim 1 , wherein an axial distance from the object-side surface of the first lens element to the image-side surface of the seventh lens element is Td, the focal length of the optical image capturing system is f, and the following relationship is satisfied:
0.50< Td/f< 1.35.

22. The optical image capturing system of claim 1 , whe

Assignees

• Largan Precision Co Ltd

Inventors

• Tsai Tsung-Han
• Huang Hsin-Hsuan

Classifications

• G02B13/18

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

• G02B9/64

  having more than six components · CPC title

• G02B3/04

  with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses} · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/002

  having at least one aspherical surface · CPC title