Abstract

The next generation optical disk drives need to realize shorter access time, higher data transfer rate and higher information density than the present ones. To realize each requirement, several methods were proposed and estimated, for example, usage of visible laser sources[1], multi-beam lasers[2,3], a split-type head structure[4] and so on. Although a split-type optical head with two or more light sources may be one of good solutions, it is not easy to control plural spots on an information track precisely and simultaneously in case of continuously-grooved disks. To solve this problem, we proposed a simple tracking method with composed the conventional twin-spot and push-pull tracking methods[5].

© 1991 Optical Society of America