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US 2016/0238818 A1Published application
Optical Image Capturing System
AssigneeAbility Opto-Electronics Technology Co.Ltd.
InventorsYAO-WEI LIU, YEONG-MING CHANG
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Abstract
The present disclosure discloses an optical image capturing system, sequentially arranged from an object side to an image side, comprises a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power; and an image-side surface and an object-side surface of the fourth lens element are aspheric. The optical image capturing system can increase aperture value and improve the imagining quality for applying to compact cameras.
Claims25
An optical image capturing system, sequentially arranged from an object side to an image side, comprising:
- a first lens element with positive refractive power;
- a second lens element with refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power;
- and
- an image plane;
- wherein the optical image capturing system comprises the four lens elements with refractive power, at least one of the second through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an image-side surface of each of the four lens elements to an axial point on the image-side surface of each of the four lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relation is satisfied:
- 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0, and 0<Σ|InRS|/InTL≦3.
5 more elements
An optical image capturing system, sequentially arranged from an object side to an image side, comprising:
- a first lens element with positive refractive power;
- a second lens element with refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power;
- and
- an image plane;
- wherein the optical image capturing system comprises the four lens elements with refractive power and at least two lens elements among the four lens elements respectively have at least one inflection point on at least one surface thereof, at least one of the second through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an image-side surface of each of the sixth lens elements to an axial point on the image-side surface of each of the sixth lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relation is satisfied:
- 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0, and 0<Σ|InRS|/InTL≦3.
5 more elements
An optical image capturing system, sequentially arranged from an object side to an image side, comprising:
- a first lens element with positive refractive power;
- a second lens element with refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power, and at least one of an object-side surface and an image-side surface having at least one inflection point;
- and
- an image plane;
- wherein the optical image capturing system comprises the four lens elements with refractive power, an object-side surface and an image-side surface of the first lens element are aspheric, and an object-side surface and an image-side surface of the fourth lens element are aspheric, at least one surface of each of at least two of the first lens element through the third lens element has at least one inflation point, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, half of a maximal view angle of the optical image capturing system is HAF, a distance from the object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, optical distortion and TV distortion for image formation in the optical image capturing system are ODT and TDT respectively, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an image-side surface of each of the four lens elements to an axial point on the image-side surface of each of the four lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relation is satisfied:
- 1.2≦f/HEP≦3.0, 0.4≦|tan(HAF)|≦3.0, 0.5≦HOS/f≦2.5, |TDT|<60%, |ODT|≦50%, and 0<Σ|InRS|/InTL≦3.
5 more elements
Dependencies are inferred from the claim text.