Optical Image Capturing System
AssigneeAbility Opto-Electronics Technology Co.Ltd.
InventorsYAO-WEI LIU, YEONG-MING CHANG
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Abstract
A four-piece optical lens for capturing image and a five-piece optical module for capturing image are disclosed. In order from an object side to an image side, the optical lens along the optical axis includes 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 at least one of the image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.
Claims25
An optical image capturing system, 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 consists of four lens elements with refractive power, 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, and the following relations are satisfied:
- 1.2≦f/HEP≦3.0 and 0.5≦HOS/f≦3.0.
An optical image capturing system, 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 consists of four lens elements with refractive power, 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 half of maximum view angle of the optical image capturing system is HAF, TV distortion and optical distortion for image formation in the optical image capturing system is TDT and ODT, respectively, and the following relations are satisfied:
- 1.2≦f/HEP 3.0, 0.5≦HOS/f≦3.0, 0.4≦|tan(HAF)|≦13.0, |TDT|<60% and |ODT|≦50%.
An optical image capturing system, from an object side to an image side, comprising:
- a first lens element with positive refractive power;
- a second lens element with negative refractive power;
- a third lens element with refractive power;
- a fourth lens element with refractive power and at least one surface among an object-side surface and an image-side surface of the fourth lens element having at least one inflection point;
- and
- an image plane;
- wherein the optical image capturing system consists of four lens elements with refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, at least one lens element among the second lens element and the third lens element has at least one inflection point on at least one surface, 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 half of maximum view angle of the optical image capturing system is HAF, a distance from an object-side surface of the first lens element to the image plane is HOS, optical distortion and TV distortion for image formation in the optical image capturing system are ODT and TDT, respectively, and the following relations are satisfied:
- 1.2≦f/HEP≦2.8, 0.4≦|tan(HAF)|≦3.0, 0.5≦HOS/f≦3.0, |TDT|<60% and |ODT|≦50%.
Dependencies are inferred from the claim text.