Abstract: Disclosed herein is a backlight unit equipped with LEDs. The backlight includes an insulating substrate, a plurality of LED packages, an upper heat dissipation plate, and a lower heat dissipation plate. The insulating substrate is provided with predetermined circuit patterns. The LED packages are mounted above the insulating substrate, and are electrically connected to the circuit patterns. The upper heat dissipation plate is formed on the insulating substrate, and is configured to come into contact with the circuit patterns and to dissipate heat. The lower heat dissipation plate is formed on the insulating substrate, and is configured to transmit heat transmitted through the upper heat dissipation plate. The upper heat dissipation plate and the lower heat dissipation plate are connected to each other by at least one through hole, and the through hole and the upper heat dissipation plate have a predetermined area ratio.

Abstract: Disclosed herein is a backlight unit equipped with LEDs. The backlight includes an insulating substrate, a plurality of LED packages, an upper heat dissipation plate, and a lower heat dissipation plate. The insulating substrate is provided with predetermined circuit patterns. The LED packages are mounted above the insulating substrate, and are electrically connected to the circuit patterns. The upper heat dissipation plate is formed on the insulating substrate, and is configured to come into contact with the circuit patterns and to dissipate heat. The lower heat dissipation plate is formed on the insulating substrate, and is configured to transmit heat transmitted through the upper heat dissipation plate. The upper heat dissipation plate and the lower heat dissipation plate are connected to each other by at least one through hole, and the through hole and the upper heat dissipation plate have a predetermined area ratio.

Abstract: Disclosed herein is a backlight unit equipped with LEDs. The backlight includes an insulating substrate, a plurality of LED packages, an upper heat dissipation plate, and a lower heat dissipation plate. The insulating substrate is provided with predetermined circuit patterns. The LED packages are mounted above the insulating substrate, and are electrically connected to the circuit patterns. The upper heat dissipation plate is formed on the insulating substrate, and is configured to come into contact with the circuit patterns and to dissipate heat. The lower heat dissipation plate is formed on the insulating substrate, and is configured to transmit heat transmitted through the upper heat dissipation plate. The upper heat dissipation plate and the lower heat dissipation plate are connected to each other by at least one through hole, and the through hole and the upper heat dissipation plate have a predetermined area ratio.

Abstract: In an LCD backlight unit using a light emitting diode, a double-sided printed circuit board includes a plurality of divided areas and conductive vias. A plurality of light emitting diodes are disposed on a top surface of the double-sided printed circuit board. A plurality of driving circuit connectors are disposed at a portion of the double-sided printed circuit board. A plurality of first lead patterns are formed on the top surface of the printed circuit board, each of the first lead patterns electrically connecting the light emitting diodes in each of the divided areas with one another. Also, a plurality of second lead patterns are formed on an underside surface of the double-sided printed circuit board to electrically connect the first lead patterns with the connectors through the conductive vias.

Abstract: An optical pickup actuator for driving, by a magnetic driving unit, in a focusing direction, a tracking direction, and a tilting direction, a bobbin on which an objective lens is disposed and which is movably supported by suspension wires, including at least one damping member is disposed at a position where greatest changes in the optical pickup actuator occur when driving the bobbin in the focusing direction, the tracking direction, and the tilting direction, so that a size of a second resonant peak is reduced.

Abstract: The optical pickup actuator includes a bobbin in which an objective lens is mounted, and suspension wires each having one end fixed on a side of the bobbin and the other end fixed to a holder disposed on a portion of a base to allow the bobbin to move with respect to the base. A magnetic circuit is installed in the bobbin and the base including a pair of unipolar magnets positioned on the base to face two sides of the bobbin. A focusing coil is wound around the bobbin. A plurality of tilting coils are installed on an upper portion of the bobbin and/or on a lower portion of the bobbin interact with the unipolar magnets to generate an electromagnetic force to control a tilting movement when a central axis of the objective lens is disposed in an upward and a downward direction.

Abstract: A backlight unit suitable for realizing a high-quality image. The backlight unit according to the present invention is a direct type, which is disposed under a liquid crystal panel to irradiate light to a back surface of the liquid crystal panel. The backlight unit includes a light source unit having a plurality of light source regions formed on a substrate, each of the light source regions driven separately and having at least one light emitting diode. The backlight unit also includes partitions provided on the substrate and disposed between the light source regions of the light source unit, and a circuit for controlling and driving the light source unit.

Abstract: In an LCD backlight unit using a light emitting diode, a double-sided printed circuit board includes a plurality of divided areas and conductive vias. A plurality of light emitting diodes are disposed on a top surface of the double-sided printed circuit board. A plurality of driving circuit connectors are disposed at a portion of the double-sided printed circuit board. A plurality of first lead patterns are formed on the top surface of the printed circuit board, each of the first lead patterns electrically connecting the light emitting diodes in each of the divided areas with one another. Also, a plurality of second lead patterns are formed on an underside surface of the double-sided printed circuit board to electrically connect the first lead patterns with the connectors through the conductive vias.

Abstract: Disclosed herein is a backlight unit equipped with LEDs. The backlight includes an insulating substrate, a plurality of LED packages, an upper heat dissipation plate, and a lower heat dissipation plate. The insulating substrate is provided with predetermined circuit patterns. The LED packages are mounted above the insulating substrate, and are electrically connected to the circuit patterns. The upper heat dissipation plate is formed on the insulating substrate, and is configured to come into contact with the circuit patterns and to dissipate heat. The lower heat dissipation plate is formed on the insulating substrate, and is configured to transmit heat transmitted through the upper heat dissipation plate. The upper heat dissipation plate and the lower heat dissipation plate are connected to each other by at least one through hole, and the through hole and the upper heat dissipation plate have a predetermined area ratio.

Abstract: An optical pickup actuator and an optical recording and/or reproducing apparatus adopting the optical pickup actuator. The optical pickup actuator includes a bobbin in which an objective lens is mounted, and suspension wires each having one end fixed on a side of the bobbin and the other end fixed to a holder disposed on a portion of a base to allow the bobbin to move with respect to the base. A magnetic circuit is installed in the bobbin and the base including a pair of unipolar magnets positioned on the base to face two sides of the bobbin. A focusing coil is wound around the bobbin. A pair of tracking coils are wound opposite one another and next to the objective lens in the radial direction to cross over the focusing coil so as to encircle the bobbin and interact with the unipolar magnets to generate an electromagnetic force to control a tracking movement.

Abstract: An optical pickup actuator for driving, by a magnetic driving unit, in a focusing direction, a tracking direction, and a tilting direction, a bobbin on which an objective lens is disposed and which is movably supported by suspension wires, including at least one damping member is disposed at a position where greatest changes in the optical pickup actuator occur when driving the bobbin in the focusing direction, the tracking direction, and the tilting direction, so that a size of a second resonant peak is reduced.