Development of UV Curable Adhesive for Optical Device

Abstract

UV curable adhesives are widely used because of their excellent optical properties and productivity advantages. When such adhesives are used for optical components, in addition to their adhesion performance, their impact resistance and assembly accuracy become key issues. Regarding assembly accuracy, the alignment of optical components is particularly important. Misalignment problems can be gellerally classified as either initial misalignment, due to curing shrinkage, or misalignment due to degradation caused by temperature changes and other factors encountered in the field. Initial misalignment can be avoided or corrected by fine adjustment during the assembly process, but misalignment occurring in the field poses serious problems, because it occurs while the product is being used by the customer. This report describes an attempt to evaluate the function of maintaining alignment by focusing on dimensional changes of the adhesive due to temperature changes and the reversibility of such dimensional,changes, using the standard S/N ratio. Parameter design was performed using the composition of the adhesive as a control factor, an optimal adhesive composition was found, and a major improvement in the maintenance of alignment was achieved.