US Patent 10185059 Optical element and optical system including the optical element

An optical element, which is composed of at least three optical members including a resin layer sandwiched between two optical members, has a high environmental resistance and optical performance, and has an excellent chromatic aberration correction effect. In the optical element, the resin layer is formed on one of light incident/exit surfaces of a first optical member, and a second optical member is cemented to the resin layer by a bonding material. A condition of φg<φr is satisfied, where φr indicates an outer diameter of the resin layer and φg indicates a diameter of cemented surface of the resin layer and the second optical member.