Abstract
Plastic lenses are usually used in many kind of optical devices, such as CD/DVD pick–up, digital camera and projector and are generally mass–produced by the injection molding method with metal molds and dies because of its cheapness and higher productivity. Recently large diameter of plastic lenses is required for the rear projector lenses or mirrors. There are some problems in large plastic optics molding because of a weld line, large tact time and residual stress. In this paper, press molding method for large plastic lenses are proposed and the fundamental molding characteristic are experimentally investigated on the different molding conditions. Finally, in the aspheric molding experiments, the higher precise and clear lenses without the weld lines and lower residual stress are obtained.
