Fabrication of LED based Ultra Slim Optical Pointing Device

Abstract

The Ultra Slim Optical Pointing Device (USOPD) is a slim optical mouse as an input device for the application of wireless portable personnel communication device like a smart phone. In this paper, we have fabricated optical components of GaN LED based USOPD. The USOPD consist of illumination optical components and imaging lens. LED beam shaping lens consisting of both aspheric lens and Fresnel facet successfully machined by Diamond Turning Machine (DTM). Additional V-shaped groove with refractive-reflective surfaces (VGRRS) for beam path banding was fabricated by bulk micromachining of silicon and the shadow effect in thermal evaporation. Fabrications of imaging lens, arrayed multilevel Fresnel lenses, were fabricated on electron beam lithography, FAB etching. The proposed optical components are extreme compactness as well as high optical efficiency, thereby applicable to the ultra slim optical system like USOPD.