Abstract: Provided is a biodegradable polyester polymer comprising a polymerization reaction product of an aliphatic dicarboxylic acid, an C6-30 aromatic dicarboxylic acid, an aliphatic diol, and a branching agent, and wherein the biodegradable polyester polymer has a ratio of z-average molecular weight (Mz) to weight average molecular weight (Mw) (“Mz/Mw”) greater than 2 and an easy-tear film including the same. The biodegradable film has excellent mechanical properties to effectively protect a product inside the packaging but also be easily opened in a controlled manner without excessive force and at the same time, provide an environmentally-friendly alternative to non-degradable plastics.

Abstract: An image photographing device including a lens holder including a lens group and a coil unit that generates an electromagnetic force, a housing into which the lens holder is movably inserted, including a magnet that faces the coil unit, an image sensor, and a diaphragm formed of nonmetal and attached to the housing and elastically supporting the lens holder. Accordingly, the diaphragm has a predetermined elasticity although not reducing the thickness, the lens holder can properly follow the signal of the coil unit, the image photographing device is highly producible, and the possibility that the diaphragm is plastically deformed is small. Also, the terminal of the coil unit is connected to a separate terminal unit installed outside the diaphragm, such that the material used to form the diaphragm can be selected regardless of the conductivity, and foreign materials, such as, flux, can be prevented from contaminating the inside of the device and degrading the quality of an image.

Abstract: An optical pickup actuator includes focus coils, track coils, and tilt coils disposed on opposite sides of a bobbin to drive the bobbin in a focus direction, a track direction, and a tilt direction and leaves the other opposite sides of the bobbin as empty sides on which the focus, track, and tilt coils are not disposed. The optical pickup actuator includes a base, a bobbin, a holder, and a magnetic driver. The bobbin is movably disposed on the base since supporting units support the bobbin above the base. The holder is disposed on one side of the base and connected to one ends of the supporting units. The magnetic driver has the focus coils driving the bobbin in the focus direction, the track coils driving the bobbin in the track direction, the tilt coils driving the bobbin in a tilt direction, and magnets installed to face the focus coils, the track coils, and the tilt coils.

Abstract: An image photographing device including a lens holder including a lens group and a coil unit that generates an electromagnetic force, a housing into which the lens holder is movably inserted, including a magnet that faces the coil unit, an image sensor, and a diaphragm formed of nonmetal and attached to the housing and elastically supporting the lens holder. Accordingly, the diaphragm has a predetermined elasticity although not reducing the thickness, the lens holder can properly follow the signal of the coil unit, the image photographing device is highly producible, and the possibility that the diaphragm is plastically deformed is small. Also, the terminal of the coil unit is connected to a separate terminal unit installed outside the diaphragm, such that the material used to form the diaphragm can be selected regardless of the conductivity, and foreign materials, such as, flux, can be prevented from contaminating the inside of the device and degrading the quality of an image.

Abstract: An actuator includes a focusing-substrate having a focusing coil pattern for generating focusing driving force, the focusing-substrate being provided with a land part and a hole through which laser beams pass, tracking coils for generating tracking driving force, the tracking coils being wound around opposite sides of the focusing substrate in parallel with the a wire direction, magnets for providing magnetic force to the focusing coil pattern and the tracking coils, and a yoke plate provided with a pair of first yokes for fixing the magnets.

Abstract: An optical pickup actuator includes focus coils, track coils, and tilt coils disposed on opposite sides of a bobbin to drive the bobbin in a focus direction, a track direction, and a tilt direction and leaves the other opposite sides of the bobbin as empty sides on which the focus, track, and tilt coils are not disposed. The optical pickup actuator includes a base, a bobbin, a holder, and a magnetic driver. The bobbin is movably disposed on the base since supporting units support the bobbin above the base. The holder is disposed on one side of the base and connected to one ends of the supporting units. The magnetic driver has the focus coils driving the bobbin in the focus direction, the track coils driving the bobbin in the track direction, the tilt coils driving the bobbin in a tilt direction, and magnets installed to face the focus coils, the track coils, and the tilt coils.

Abstract: An optical pickup actuator includes focus coils, track coils, and tilt coils disposed on opposite sides of a bobbin to drive the bobbin in a focus direction, a track direction, and a tilt direction and leaves the other opposite sides of the bobbin as empty sides on which the focus, track, and tilt coils are not disposed. The optical pickup actuator includes a base, a bobbin, a holder, and a magnetic driver. The bobbin is movably disposed on the base since supporting units support the bobbin above the base. The holder is disposed on one side of the base and connected to one ends of the supporting units. The magnetic driver has the focus coils driving the bobbin in the focus direction, the track coils driving the bobbin in the track direction, the tilt coils driving the bobbin in a tilt direction, and magnets installed to face the focus coils, the track coils, and the tilt coils.

Abstract: An optical pickup actuator reducing an access time to a disc, and an optical recording and/or reproducing apparatus using the same. The optical pickup actuator includes a base, a wire holder on one side of the base, a bobbin on which an objective lens is placed, first and second yokes, suspension wires, and a magnetic driving unit for driving the bobbin in focusing and tracking direction. The first yoke is between one side of the bobbin and the wire holder, and the second yoke is on the other side of the bobbin. A damping member is inserted into the first yoke. One end of each of the suspension wires is fixed to the wire holder, and the other end movably supports the bobbin. Accordingly, an access time, an important performance characteristic in a high-speed optical recording and/or reproducing apparatus is reduced due to an improvement of a damping effect.

Abstract: Disclosed herein are a yoke plate for optical pick-up actuators, a combination structure of a suspension PCB and a yoke plate, and an optical pick-up actuator comprising the structure. The yoke plate comprises a rear yoke at the distal end of one side of the yoke plate, and the rear yoke has damping-gel fillers for attenuating a partial resonance of the suspension wires. The yoke plate is simplified in construction by supporting the suspension PCB using the rear yoke instead of a conventional wire holder, so that assembly process can be simplified and the manufacturing costs can be reduced. The suspension PCB is combined with the yoke plate by bonding or soldering instead of screw fastening, so that the suspension PCB can be combined with the yoke plate without displacement or distortion. The optical pick-up actuator with the combination structure can be provided by a simplified assembly process and reduced manufacturing costs.

Abstract: An actuator includes a focusing-substrate having a focusing coil pattern for generating focusing driving force, the focusing-substrate being provided with a land part and a hole through which laser beams pass, tracking coils for generating tracking driving force, the tracking coils being wound around opposite sides of the focusing substrate in parallel with the a wire direction, magnets for providing magnetic force to the focusing coil pattern and the tracking coils, and a yoke plate provided with a pair of first yokes for fixing the magnets.

Abstract: An optical pickup actuator reducing an access time to a disc, and an optical recording and/or reproducing apparatus using the same. The optical pickup actuator includes a base, a wire holder on one side of the base, a bobbin on which an objective lens is placed, first and second yokes, suspension wires, and a magnetic driving unit for driving the bobbin in focusing and tracking direction. The first yoke is between one side of the bobbin and the wire holder, and the second yoke is on the other side of the bobbin. A damping member is inserted into the first yoke. One end of each of the suspension wires is fixed to the wire holder, and the other end movably supports the bobbin. Accordingly, an access time, an important performance characteristic in a high-speed optical recording and/or reproducing apparatus is reduced due to an improvement of a damping effect.

Abstract: An optical pickup actuator includes focus coils, track coils, and tilt coils disposed on opposite sides of a bobbin to drive the bobbin in a focus direction, a track direction, and a tilt direction and leaves the other opposite sides of the bobbin as empty sides on which the focus, track, and tilt coils are not disposed. The optical pickup actuator includes a base, a bobbin, a holder, and a magnetic driver. The bobbin is movably disposed on the base since supporting units support the bobbin above the base. The holder is disposed on one side of the base and connected to one ends of the supporting units. The magnetic driver has the focus coils driving the bobbin in the focus direction, the track coils driving the bobbin in the track direction, the tilt coils driving the bobbin in a tilt direction, and magnets installed to face the focus coils, the track coils, and the tilt coils.