Experimental Investigation of Precision Plastic Lens Cutting

Development of Precision Chucking Technique by the Profile Error Analysis

Abstract

For aspheric plastic lenses, very smooth surface roughness and high profile accuracy are required. However when a plastic lens is machined from plastics by cutting directly, there is a serious problem in that profile accuracy deteriorates by chucking even if the lens is machined precisely on a machine tool. Consequently, a new chucking technique which decreases the deformation has been developed by analyzing the cause. It has been also clarified that the chucking deformation before machining is different from that after machining. By using this technique, an aspheric plastic lens can be machined with high profile accuracy of less than 1μm.