Patent ID: 9638893
Date: 2017-05-02
CPC Classifications: G02B

Claim:
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 negative refractive power; a third lens having positive refractive power; and an image plane; wherein the optical image capturing system consists of the three lenses with refractive power; each of at least two lenses among the first to the third lenses has at least an inflection point on at least one 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: where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HOS is a distance on the optical axis from a point on an object-side surface of the first lens where the optical axis passes through to a point on the image plane where the optical axis passes through; ETP1, ETP2, and ETP3 are respectively a thickness at the height of ½ HEP of the first lens, the second lens, and the third lens; SETP is a sum of the aforementioned ETP1 to ETP3; TP1, TP2, and TP3 are respectively a thickness of the first lens, the second lens, and the third lens on the optical axis; STP is a sum of the aforementioned TP1 to TP3; wherein the optical image capturing system further satisfies: where EBL is a horizontal distance in parallel with the optical axis between a coordinate point at the height of ½ HEP on the image-side surface of the third lens and image surface; BL is a horizontal distance in parallel with the optical axis between the point on the image-side surface of the third lens where the optical axis passes through and the image plane.