Patent ID: 7308694
Filing Date: 2007-12-11
Classification: G11B

Abstract:
1. A high-precision positioning apparatus comprising: a coarse driving unit for producing horizontal movements of a flat recording medium relative to an optical system, the recording medium being used for optically recording and playing back information, the coarse driving unit comprising a fine driving unit for producing horizontal and small movements of the recording medium relative to the optical system, the fine driving unit comprising wherein the driving shaft is connected to the recording medium and drives it; the raising/lowering device for producing movements of the fine driving unit along the driving shaft; the first driving frame is movable relative to the frame-shaped unit body by fine driving devices in the horizontal direction of the recording medium; the second driving frame is movable relative to the first driving frame by other fine driving devices in the horizontal direction of the recording medium and in the direction substantially orthogonal to the moving direction of the first driving frame; the fine driving unit secures the second driving frame to the recording medium while being moved along the driving shaft by the raising/lowering device to isolate the recording medium from the driving shaft, and allows the first driving frame and the second driving frame to move relative to each other for producing horizontal and small movements of the recording medium.