US Patent 11360290 Lens system, projection apparatus, detecting module and electronic device

An electronic device includes a lens system. The lens system includes three lens elements, which are, in order from an outer side to an inner side: a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an outer-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has positive refractive power.