Imaging optical lens system, image capturing unit and electronic device

Abstract

Imaging optical lens systems comprise at least first and second lens elements in order from an object side to an image side along a traveling direction of an optical path. The object-side surface of the first lens element E1 is convex in a paraxial region and at least one surface of at least one lens element has at least one inflection point (P). The imaging optical lens systems are in a first state when an imaged object is at an infinite object distance. An axial distance between the object-side surface of the lens element closest to the object side and the image-side surface of another lens element closest to the image side in the imaging optical lens system when the imaging optical lens system is in the first state is TDL. An axial distance between the image-side surface of the another lens element closest to an image surface and the image surface in the imaging optical lens system is BLL, and the following condition is satisfied: 2.00 < BLL / TDL < 5.50. The optical lens system may have five lens elements (E1-E5). Alternatively, the optical lens system may have a moveable lens group G1 and a last lens group G2. [Fig 1]