REFERENCE DISK FOR CONTROLLING FOCUS IN OPTICAL DISK DRIVER AND METHOD FOR CONTROLLING FOCUS IN OPTICAL DISK DRIVER AND FABRICATION METHOD OF OPTICAL DISK DRIVER

摘要

PURPOSE: A reference disc and a method for adjusting a focus of an ODD(Optical Disc Drive), and the method for manufacturing the ODD are provided to offer the reference disc for measuring a performance of an optical pickup in the ODD and adjust the focus of the optical pickup by using the reference disc. CONSTITUTION: An on-signal sector(110) having a recording mark and an off-signal sector(120) having no recording mark are alternatively formed on the reference disc(100). In case that a recording method is a magneto optic method, a magnetization direction of the on-signal sector and the off-signal factor is oppositely formed. In the case that the recording method is a phase change method, a reflecting film is formed on the on-signal sector and the off-signal part is formed with a non-reflecting substance.