Application of Liquid Crystal to Optical Head for Optical Disk (1)

Abstract

We have investigated an optical head using a liquid crystal device (LCD) as a new application. The wave front aberration caused by a disc tilt is reduced by using an LCD because an LCD can control refractive index by applying voltage. As a result, the optical disc tilt margin is expanded. In addition, we achieved a disc tilt servo and CD/DVD compatibility with one LCD.