High-speed access mechanism for 90 mm 1-inch-high optical disk drive

A 90 mm, 1-inch-high optical disk drive with a 17-mm-high mechanism and a 27 ms seek time was developed using a separated optical system with an improved galvanomirror. This optical layout reduced the weight of the movable optical part to 7 g. The maximum acceleration of 127 m/s 2 was driven by 8 W. The major component parts of the galvanomirror, such as the mirror holder and base, were made of anisotropic liquid-crystalline polymer. The use of this material, which has high rigidity and low thermal expansion, resulted in optical spot drifting due to mirror rotation of less than 3 µm from room temperature to 65°C.