Development of Micro-Lens for High Density Small Form Factor Optical Pickup

Development of Integrated Optical Pickup for Small Form Factor Optical Disc Drive

“…The objective lens unit is designed to have a hybrid type composed of refractive lens, diffractive lens and lens holder which was fabricated in the form of array. The efficiency of the fabricated diffractive lens was around 85% and the wavefront error of the hybrid type micro objective lens unit of NA 0.85 was 0.029 rms [2].…”