OPTICAL IMAGE CAPTURING LENS SYSTEM

摘要

This disclosure provides an optical image capturing lens system comprising: a positive first lens element having a convex object-side surface, a negative second lens element, a positive third lens element having a convex image-side surface, a fourth lens element having a concave object-side surface and a convex image-side surface; and a positive fifth lens element having a convex object-side surface at a paraxial region thereof, both of the object-side and image-side surfaces being aspheric, and at least one inflection point is positioned on at least one of the object-side and image-side surfaces thereof. When particular relations are satisfied, the angle at which light projects onto the image plane can be efficiently controlled for increasing the relative illumination and preventing the occurrence of vignetting.

主权项

1. An optical image capturing lens system, in order from an object side to an image side comprising five lens elements with refractive power:
a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power having a convex image-side surface; a fourth lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and both of the object-side and image-side surfaces being aspheric; and a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, both of the object-side and image-side surfaces being aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface thereof; wherein the lens elements with refractive power in the optical image capturing lens system are the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element; wherein a focal length of the optical image capturing lens system is f, a focal length of the fifth lens element is f5, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, and they satisfy the following relations:
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