Image system lens assembly, image capturing unit and electronic device

The invention discloses an image system lens assembly which includes seven lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. At least one surface among object-side surfaces and image-side surfaces of the fifth lens element, the sixth lens element and the seventh lens element has at least one critical point in an off-axis region thereof. When certain conditions are satisfied, the image system lens assembly can simultaneously satisfy high image quality and miniaturization requirements. The present invention also discloses an image capturing unit having the image system lens assembly and an electronic device having the image capturing unit. 本发明公开种影像系统镜组，包括七片透镜。该七片透镜由物侧至像侧依序为第透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜以及第七透镜。第五透镜、第六透镜以及第七透镜的所有物侧表面及所有像侧表面中至少表面于离轴处具有至少临界点。当满足特定条件时，影像系统镜组能同时满足高成像质量及微型化的需求。本发明还公开具有上述影像系统镜组的取像装置及具有取像装置的电子装置。