Abstract: Provided is a spindle motor which includes a base, a sleeve fixed on the base and having a hollow portion, and a shaft rotatably installed in the hollow portion of the sleeve. In the spindle motor, a plurality of journal grooves are formed in an outer circumferential surface of the shaft to form a journal bearing which supports the shaft in a radial direction when the shaft rotates, and the journal grooves are arranged at an uneven interval.

Abstract: An actuator latch apparatus for a data storage device includes a latch lever installed on a base plate of the data storage device capable of pivoting and having a first latch portion provided at one end portion of the latch lever, a spring connected to the other end portion of the latch lever and made of a shape memory alloy to allow the latch lever to pivot in a predetermined direction by being deformed according to application of electric power, and a second latch portion provided at an end portion of an actuator moving a read/write head to a predetermined position of a disk.

Abstract: The apparatus senses the positions of X- and Y- axes of the stage by applying an excitation signal having a phase difference to a stator of each axis of the XY-stage and then time-division detecting changes in capacitance from a moving plate.

Abstract: An apparatus for sensing the position of an electrostatic XY-stage through time-division multiplexing is provided. The apparatus senses the positions of X- and Y-axes of the stage by applying an excitation signal having a phase difference to a stator of each axis of the XY-stage and then time-division detecting changes in capacitance from a moving plate.