Study on ultra-fine machining of a complex micro-lens mold with a lenticular pattern on an aspherical surface

摘要

Demand for special optical components having the ability to concentrate and diffuse light effect has increased in order to improve luminance efficiency and function, relative to displays using micro lenses. There is a demand for design and machining technology for optical components that achieve various effects, among them the correction of light aberration and transmittance paths from aspherical surfaces with micro patterns. In this study, micro lens molds were machined that were able to simultaneously concentrate and diffuse light by means of lenticular patterns on aspherical surfaces. Two micro lens molds with micro lenticular pattern (pitch (P) of 10 and 100 μm) were machined on a sine type aspherical surface (amplitude (W) 0.15 mm and period (T) 3.0 mm). The micro lens molds were machined using an ultra-precision DTM (Diamond Turning Machine) and SSS (Slow Slide Servo). The micro lenses were replicated using PMMA resin; then light-transmission measurements were performed to confirm the effectiveness of the shape of various parts of the lenses on light-transmission. It was confirmed by measurement that concentration and diffusion light effects were simultaneously achieved.