Optical image capturing system
View Patent ↗The invention discloses a three-piece optical lens for capturing image and a three-piece optical module for capturing image, which include, along the optical axis in order from an object side to an image side, a first lens with positive refractive power having an object-side surface which can be convex; a second lens with refractive power; a third lens with refractive power; two surfaces of each of the three lenses can be both aspheric. The third lens can have positive refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the third lens has an inflection point. The optical lens can increase aperture value and improve the imaging quality for use in a compact camera.
1. An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having refractive power; and
an image plane;
an aperture and an image sensor on the image plane,
wherein the optical image capturing system consists of the three lenses with refractive power;
at least two of the three lenses each has at least an inflection point on at least a surface thereof;
the third lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, and
both the object-side surface and the image-side surface of the third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2≦ f/HEP≦ 6.0; and
0.5≦ HOS/f≦ 3.0; and
0.5≦ InS/HOS≦ 1.1; and
0< HIF/HOI≦ 0.9;
where f1, f2, and f3 are focal lengths of the first lens to the third lens, respectively;
f is a focal length of the optical image capturing system;
where InS is a distance in parallel with the optical axis between the aperture and the image plane; and
HIF is a distance perpendicular to the optical axis between any inflection point and the optical axis,
HOI is a height for an image formation of the optical image capturing system,
HEP is an entrance pupil diameter of the optical image capturing system; and
HOS is a distance in parallel with the optical axis from an object-side surface of the first lens to the image plane.
2. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 deg< HAF≦ 70 deg;
| TDT|< 60%; and
| ODT|< 50%;
where HAF is a half of a view angle of the optical image capturing system; TDT is a TV distortion; and ODT is an optical distortion.
3. The optical image capturing system of claim 1 , wherein the third lens has at least an inflection point on at least one of the surfaces thereof.
4. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 mm< HIF≦ 5 mm.
5. The optical image capturing system of claim 4 , wherein the optical image capturing system further satisfies:
0< HIF/InTL≦ 5;
where InTL is a distance in parallel with the optical axis between the object-side surface of the first lens and the image-side surface of the third lens.
6. The optical image capturing system of claim 4 , wherein the optical image capturing system further satisfies:
0 mm< SGI≦ 1 mm;
where PI is a point on a surface of the lenses, through which the optical axis passes, and SGI is a displacement in parallel with the optical axis from PI to the inflection point on the surface.
7. The optical image capturing system of claim 1 , wherein the third lens has positive refractive power.
8. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.5≦ InTL/HOS≦ 0.9;
where InTL is a distance in parallel with the optical axis between the object-side surface of the first lens and the image-side surface of the third lens.