Image capturing optical system, image capturing device and portable device

摘要

The present invention provides an image capturing optical system comprising: a positive first lens element having a convex object-side surface in a paraxial region; a second lens element with refractive power; a third lens element; a fourth lens element having a concave image-side surface in a paraxial region; a plastic fifth lens element having a concave image-side surface in a paraxial region, and the image-side surface has at least one convex shape in an off-axis region thereof; and a plastic sixth lens element w having a concave image-side surface in a paraxial region, and the image-side surface has at least one convex shape in an off-axis region thereof.

主权项

1. An image capturing optical system comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex object-side surface in a paraxial region thereof; a second lens element with negative refractive power; a third lens element; a fourth lens element having a concave image-side surface in a paraxial region thereof; a fifth lens element having a concave image-side surface in a paraxial region thereof; wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, the fifth lens element is made of plastic, and the image-side surface thereof has at least one convex shape in an off-axis region thereof; and a sixth lens element having a concave image-side surface in a paraxial region thereof; wherein both of an object-side surface and the image-side surface of the sixth lens element are aspheric, the sixth lens element is made of plastic, and the image-side surface thereof has at least one convex shape in an off-axis region thereof; wherein the image capturing optical system has a total of six lens elements; wherein an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the fifth lens element is CT5, a curvature radius of the object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, a sum of the central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, and the sixth lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, and the following conditions are satisfied:
0.70