Abstract: A local light-emitting road sign board apparatus is disclosed. Local light-emitting panels, displaying road guides in the form of a character, numeral, symbol, or figure, are independently inserted and installed in openings for road sign units that are provided in a main substrate. A sub substrate and a retroreflective sheet are laminated and bonded on each local light-emitting panel so as to form a road sign unit. A retroreflective sheet is also bonded on the main substrate so as to form the background of a road sign unit. When one of road sign units fails, it is possible to simply separate, repair or replace, and reinstall only the failed road sign unit while leaving the others intact.

Abstract: A local light-emitting road sign board apparatus is disclosed. Local light-emitting panels, displaying road guides in the form of a character, numeral, symbol, or figure, are independently inserted and installed in openings for road sign units that are provided in a main substrate. A sub substrate and a retroreflective sheet are laminated and bonded on each local light-emitting panel so as to form a road sign unit. A retroreflective sheet is also bonded on the main substrate so as to form the background of a road sign unit. When one of road sign units fails, it is possible to simply separate, repair or replace, and reinstall only the failed road sign unit while leaving the others intact.

Abstract: Disclosed is an aerodynamic bearing assembly for a spindle motor for hard disk drives, in which a hub of the spindle motor is pivoted in both radial and thrust directions by the ball bearing, which directly contacts the center of the hub, to perform rotation according to the rotational principle of a whirligig, and is subject to the thrust load through the aerodynamic bearing assembly with air groove(s) without being in contact with it, so that the hub maintains a rotational center without mechanical contact resulting in noise and starting failure of the assembly during an initial starting (low-speed rotation). The assembly includes air grooves, the air groove generating aerodynamic pressure between the hub and the aerodynamic bearing while the hub rotates.