Optical design of high-aperture aspherical projection lens

Abstract

Aspherical projection lens for large screen television has been designed with a peW idea. The designing process based on this idea is analysed. :L INTRODUCTIONAccording to the recent innovation in plastic molding technology for aspherical lenses, an unique lens system, actively using aspherical lenses has been apPariflg.A typical and successful example is the projection lens for a large screen television, which is expected to become the main stream for the coming HDTV era in the near future, because of its compactness, light weight, and proper luminance level.The design of such lens system is quite exhosting work because the limit of aberration correcting ability of aspherical lenses is inestimable and the shape of a designed aspherical lens are not always suitable for molding in consideration with the precision and the productivity.We have been strugling to find an efficient and explicit way in the aspherical optical design for projection lens. The results we have got so far are described here.