Condensing lens and photovoltaic system using the same

摘要

A condensing lens includes a lens body and a prism structure. The lens body has a first surface and a second surface opposite to each other. The prism structure is disposed on the second surface of the lens body and has a plurality of annular prism units. The prism structure has at least two focuses in accordance with the annular prism units, and the focuses are distributed on a plane which is parallel to the first surface of the lens body.