OPTICAL PHOTOGRAPHING LENS ASSEMBLY, IMAGING UNIT AND ELECTRONIC DEVICE

摘要

An optical photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the third lens element are aspheric. The fourth lens element has negative refractive power, wherein both of an object-side surface and an image-side surface of the fourth lens element are aspheric. The optical photographing lens assembly has a total of four non-cemented lens elements with refractive power.

主权项

1. An optical photographing lens assembly comprising, in order from an object side to an image side:
a first lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof; a second lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof; a third lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof, both of an object-side surface and the image-side surface of the third lens element being aspheric; and a fourth lens element having negative refractive power, both of an object-side surface and an image-side surface of the fourth lens element being aspheric; wherein the optical photographing lens assembly has a total of four lens elements with refractive power, the first through the fourth lens elements are non-cemented, the optical photographing lens assembly further comprises an aperture stop, at least one of the third lens element and the fourth lens element of the optical photographing lens assembly has at least one inflection point, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, an axial distance between an object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the aperture stop and the image-side surface of the fourth lens element is SD, an axial distance between the object-side surface of the first lens element and an image plane is TL, a maximum image height of the optical photographing lens assembly is ImgH, and the following conditions are satisfied:
(T23+T34)/T12<0.70;−1.8<(R7+R8)/(R7−R8);0.45