Lens systems, projection equipment, and electronic devices

Abstract

The invention relates to a lens system comprising two lens elements, in order from magnifying to reducing along the optical path, namely the first lens element and the second lens element. Each of the two lens elements has its magnifying surface facing the magnifying side and its reducing surface facing the reducing side. At least one of the magnifying and reducing surfaces of at least one of the two lens elements is non-spherical. The morning's criticism also touched upon projection equipment and electronic devices.