The aspherical plastic singlet which we developed in 1984 is widely used not only for CD (Compact Disc) players, but also for every sort of optical disk player and driver. The history, the development technologies, the impact of the development and its fringe effects, as well as the recent progress, and a forecast for this aspherical plastic singlet are summarized.
Tadashi Kojima, Tadashi Kojima,
"Advances in optical disk lens (Invited Paper)", Proc. SPIE 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation, (20 October 1992); doi: 10.1117/12.132136; https://doi.org/10.1117/12.132136