Optical pick-up system for use in an optical disk device including use of improved gratings with more efficient beam diffraction

摘要

The present invention is an optical pick-up system for use in an optical disk device including more efficient beam diffraction for tracking purposes. The system may be used for one or more types of optical disks (e.g., DVDs, CDs, CD-ROMs). The invention includes a system for use in a DVD player; however, the present invention is applicable to any optical disk device. The system invention includes a gray-scale grating, which provides more efficient diffraction of tracking and processing portions of the laser(s) used in optical disk devices.