High performance optical pick up actuator with singlet objective lens for BD/DVD/CD compatible drive
For perfect compatibility of BD/DVD/CD, a heavy objective lens assembly is inevitable. However, BD format needs very high transfer rate to edit the contents of HD media, without delay. And performance of an optical pick up actuator is one of several keys to make it possible. To secure high sensitivity, we introduce a magnetic circuit composed of two 3 pole magnets. As a result of it, despite heavy weight of lens assembly, we achieved high performance enough to operate the disc drive as BD CLV 4X.