Abstract: A stack package includes a printed circuit board; at least two semiconductor chips stacked on the printed circuit board, each having first re-distribution lines formed on the upper surface thereof and connected to bonding pads, through silicon vias which are formed therethrough and connected to the first re-distribution lines, and second re-distribution lines formed on the lower surface thereof and connected to the through silicon vias; first and second solder balls interposed between the first and second re-distribution lines which face each other and between the first re-distribution lines of the lowermost semiconductor chip and electrode terminals of the printed circuit board; a molding material for molding the upper surface of the printed circuit board including the stacked semiconductor chips; and third solder balls attached to ball lands formed on the lower surface of the printed circuit board.

Abstract: To manufacture a wafer level stack package, first and second wafers having first and second via patterns are prepared. The second wafer is attached to the first wafer such that the front sides of the first and second wafers face each other and the first and second via patterns are connected to each other. The back side of the second wafer is ground and etched such that the lower ends of the second via patterns are exposed and projected. The back side of the first wafer is ground and etched such that the lower ends of the first via patterns are exposed and projected. A chip level stack structure is formed by sawing a wafer level stack structure having the stacked wafers into a chip level. The chip level stack structure is attached to a substrate having electrode terminals.

Abstract: A wafer level chip scale package includes a semiconductor chip having a plurality of pads; a lower insulation layer having a high Young's modulus of 1˜5 GPa formed on the semiconductor chip to expose the plurality of pads; a plurality of metal patterns formed on the lower insulation layer to be connected to the respective pads; an upper insulation layer having a high Young's modulus of 1˜5 GPa formed on the lower insulation layer and the metal patterns to partially expose the metal patterns; and a plurality of solder balls formed on exposed portions of the metal patterns.

Abstract: In an optical pickup actuator performable a tilting operation which operates an object lens so as to follow the center of signal tracks of an optical disc, an optical pickup actuator performable a tilting operation includes a plurality of damper holders separately fixed to both sides of a base, a lens holder placed between the plurality of damper holders and having an object lens for reading and writing information on a disc, suspension support means separately connected between both sides of the lens holder and the plurality of damper holders so as to support the lens holder as two sides one-stage support structure, and magnetic operating means separately installed at the lens holder and the base and operating the lens holder so as to follow an optical disc, accordingly an optical pickup actuator performable a tilting operation in accordance with the present invention can perform not only a translational motion in a tracking direction and a focusing direction but also a tilting motion in a radial direction a

Abstract: An optical pick-up actuator of the present invention includes a lens holder having a objective lens and tracking and focusing coils, a frame for raising the lens holder in a magnetic field using a suspension wire, and a tilt driving magnetic circuit for driving the actuator in a third direction as well as focusing and tracking directions.

Abstract: An optical pickup actuator is provided to improve a driving property in a radial direction. In accordance with the optical pickup actuator of the present invention, radial coils are wired in predetermined locations of both side parts of a lens holder. In addition, ends of existing fixed members are curved and protruded outside. Magnets for radial coil are attached to the protruded part. Therefore, a mass to be applied to the lens holder is minimized and an excellent driving property is ensured in focusing and tracking directions as well as in a radial direction, thereby simplifying the structure and decreasing the cost.

Abstract: An optical pick-up actuator includes a lens holder suspended in a magnetic field by a suspension wire and having tracking and focusing coils and objective lens, a magnet for generating a magnetic field crossing other magnetic field generated by a electric current along tracking and focusing coils so as to drive the objective lens in focusing and tracking directions in suspended state, a frame for supporting the lens holder by the suspension wire, a yoke for securing the frame by a shaft, pairs of tilting coils mounted at both end portion of the frame for driving the lens holder in suspended state by suspension wires by rotating the frame in a predetermined direction on the axis of the shaft, and pairs of tilting magnets arranged so as to correspondingly face the tilting coils.

Abstract: In an optical pickup actuator performable a tilting operation which operates an object lens so as to follow the center of signal tracks of an optical disc, an optical pickup actuator performable a tilting operation includes a plurality of damper holders separately fixed to both sides of a base, a lens holder placed between the plurality of damper holders and having an object lens for reading and writing information on a disc, suspension support means separately connected between both sides of the lens holder and the plurality of damper holders so as to support the lens holder as two sides one-stage support structure, and magnetic operating means separately installed at the lens holder and the base and operating the lens holder so as to follow an optical disc, accordingly an optical pickup actuator performable a tilting operation in accordance with the present invention can perform not only a translational motion in a tracking direction and a focusing direction but also a tilting motion in a radial direction a

Abstract: An optical pick-up actuator includes a lens holder suspended in a magnetic field by a suspension wire and having tracking and focusing coils and objective lens, a magnet for generating a magnetic field crossing other magnetic field generated by a electric current along tracking and focusing coils so as to drive the objective lens in focusing and tracking directions in suspended state, a frame for supporting the lens holder by the suspension wire, a yoke for securing the frame by a shaft, pairs of tilting coils mounted at both end portion of the frame for driving the lens holder in suspended state by suspension wires by rotating the frame in a predetermined direction on the axis of the shaft, and pairs of tilting magnets arranged so as to correspondingly face the tilting coils.

Abstract: An optical pick-up actuator of the present invention includes a lens holder having a objective lens and tracking and focusing coils, a frame for raising the lens holder in a magnetic field using a suspension wire, and a tilt driving magnetic circuit for driving the actuator in a third direction as well as focusing and tracking directions.