Fablication method of an optical lens arrray using ultraviolet light and ultrasound vibration
An optical lens array is used various field such as camera modules and liquid crystal displays. In this report, a new fabrication technique of a lens array was proposed using ultraviolet (UV)-curable resin and ultrasound vibration. The hardening characteristics of the gel were investigated. An UV-curable gel film was formed on a glass plate having four ultrasound transducers. By exciting the transducers, the lattice flexural vibration was generated on the glass plate. The acoustic radiation force was generated to the gel surface, so that the gel was statically deformed. The lens array could be formed for 20 minutes under UV-light irradiation with keeping the deformation. The quality factor of the transducer resonance was measured in order to investigate the curing of resin, and the quality factor decreased with time. It was found that the gel acts as the damper and additional mass as the lens array was formed.