Photographing optical lens system

摘要

A photographing optical lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element with negative refractive power is made of plastic material, and has a concave object-side surface and a convex image-side surface. The fifth lens element with negative refractive power is made of plastic material, and has a concave object-side surface and a concave image-side surface. At least one surface of the fourth through fifth lens elements is aspheric, and the image-side surface of the fifth lens element changes from concave at the paraxial region to convex at the peripheral region.

主权项

1. A photographing optical lens 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; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with negative refractive power made of plastic material, and having a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fourth lens lement is aspheric; and a fifth lens element with negative refractive power made of plastic material, and having a concave object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric, and the image-side surface of the fifth lens element changes from concave at the paraxial region to convex at the peripheral region; wherein the photographing optical lens system has a total of five lens elements with refractive power, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a focal length of the photographing optical lens system is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following relationships are satisfied:
−10