Patent ID: 11947086
Assignee: ABILITY OPTO-ELECTRONICS TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. An optical image capturing system, from an object side to an image side, comprising:
a first lens with negative refractive power, wherein an object-side surface of the first lens on the optical axis is a concave surface, and an image-side surface of the first lens on the optical axis is a concave surface;
a second lens with positive refractive power;
a third lens with positive refractive power;
a fourth lens with negative refractive power;
a fifth lens with positive refractive power;
a sixth lens with negative refractive power; and
an image plane;
wherein the optical image capturing system comprises the six lenses with refractive power and made of plastic, a maximum height for image formation on the image plane perpendicular to an optical axis in the optical image capturing system is HOI, focal lengths of the first lens through the sixth lens are f1, f2, f3, f4, f5 and f6, respectively, and a focal length of the optical image capturing system is f, the entrance pupil diameter of the optical image capturing system is denoted by HEP, a half maximum angle of view of the optical image capturing system is denoted by HAF, a distance on an optical axis from an object side of the first lens to the image plane is denoted by HOS, a distance on the optical axis from the object side of the first lens to the image side of the sixth lens is denoted by InTL, a horizontal distance parallel to the optical axis from the first coordinate point on the object side of the first lens at height of ½ HEP to a second coordinate point on the image side of the sixth lens at height of ½ HEP is denoted by EIN, and the following conditions are satisfied:

2.6≤f/HEP≤2.8; 50 deg<HAF≤70 deg; 0.5≤HOS/f≤5; 0.5≤HOS/HOI≤1.9; and 0.2≤EIN/ETL<1.