Abstract: A pixel includes: a storage capacitor connected between a first power supply voltage and a gate node; a first transistor including a gate electrode connected to the gate node; a second transistor to transfer a data signal to a source of the first transistor in response to a scan signal; a third transistor to diode-connect the first transistor in response to the scan signal, and including first and second sub-transistors serially connected between the gate node and a drain of the first transistor; a fourth transistor to transfer an initialization voltage to the gate node in response to an initialization signal, and including third and fourth sub-transistors serially connected between the gate node and the initialization voltage; and an organic light emitting diode including a cathode connected to a second power supply voltage. At least one of the second and fourth sub-transistors includes a bottom electrode.

Abstract: The present disclosure relates to an apparatus for preparing an oligomer, the apparatus including: a reactor for oligomerizing a feed stream containing a fed monomer; a stirrer inserted into a hole formed in an upper portion of the reactor; and a solvent transfer line extending inward from a side of the reactor, wherein the stirrer includes a rotating shaft vertically extending downward from the upper portion of the reactor, and a blade having a conical shape whose vertex is positioned at a lower end of the rotating shaft and outer diameter increases from a bottom toward a top, and the solvent transfer line has a plurality of spray nozzles formed in a direction toward the blade.

Abstract: A freight vehicle on which a drone is docked, may include: a transfer device provided in the vehicle and configured to move up and down between an internal space of the vehicle and a roof to receive freight from the drone through the roof of the vehicle or transfer freight to the drone; and a loadspace separated, as a portion of the internal space of the vehicle, from a space where the transfer device is provided and including an open portion formed on a side or a rear of the vehicle, and onto which the freight is loaded.

Abstract: A high-speed stack molding device utilizing a rotary multi-mould, including a base having a moving rail formed on an upper surface thereof; a mould-rotating unit disposed on the base and supporting both ends of a multi-mould to selectively rotate the multi-mould; a movable driving frame including vertical frames extending upward from slide-coupling parts, which are moved forward and rearward along the moving rail and an upper frame connecting upper end portions of the vertical frames to cover an upper portion of the multi-mould; a fiber-reinforced resin supplying unit connected to the movable driving frame and supplying a fiber discharged from a supplying roller to the upper frame through pressure rollers; and a stacking head provided at an end portion of an articulated robot arm connected operably to the upper frame for pressurizing and stacking the fiber-reinforced resin.

Abstract: An apparatus for manufacturing a composite leaf spring, including: a supply roller configured to wind a reinforcing fiber on an outer circumference thereof; a resin impregnation unit configured to supply a synthetic resin to the reinforcing fiber withdrawn from the supply roller; a polyprism-shaped rotating mold unit rotatably disposed at one side of the resin impregnation unit, and having molding grooves formed along an outer surface in a circumferential direction thereof to be in communication with each other and disposed in multiple rows; and a supply arm including a withdrawing means configured to protrude to one side of the resin impregnation unit and to withdraw the reinforcing fiber, and an elastic guide configured to guide the reinforcing fiber to each of the molding grooves.

Abstract: A high-speed stack molding device utilizing a rotary multi-mould, including a base having a moving rail formed on an upper surface thereof; a mould-rotating unit disposed on the base and supporting both ends of a multi-mould to selectively rotate the multi-mould; a movable driving frame including vertical frames extending upward from slide-coupling parts, which are moved forward and rearward along the moving rail and an upper frame connecting upper end portions of the vertical frames to cover an upper portion of the multi-mould; a fiber-reinforced resin supplying unit connected to the movable driving frame and supplying a fiber discharged from a supplying roller to the upper frame through pressure rollers; and a stacking head provided at an end portion of an articulated robot arm connected operably to the upper frame for pressurizing and stacking the fiber-reinforced resin.

Abstract: A spindle motor includes a spindle motor hub that supports one or more disks, and has a contact area reduction portion that minimizes the area of contact between the hub and a disk when the disk is mounted to the hub. The spindle motor hub includes a hub body having a cylindrical sidewall that includes a contact section around which the disk extends and a non-contact section. The non-contact section is constituted by the contact area reduction portion. An outer diameter of the cylindrical hub body at the contact section is greater than an outer diameter of the cylindrical hub body at the contact area reduction portion of the non-contact section.

Abstract: An HDD includes a head stack assembly, a voice coil motor, and a retracting pin unit. The retracting pin unit includes a mobile retracting pin generating a retracting force to maintain the actuator arm at a predetermined position by interacting with the magnet when the read/write head is parked, and coupled to the bobbin to be capable of relatively moving with respect to the bobbin toward the magnet when the bobbin is separated from the magnet due to an external shock. A head on disk phenomenon, in which the parking state of the read/write head is removed when an external shock such as a linear shock or a rotary shock, which may be generated as the HDD is installed in a notebook computer, is applied to the HDD, may be reduced.

Abstract: A method and apparatus for controlling a rotation of a motor in a disk drive. The method includes: performing spin-up when the disk drive is operating and determining whether a disk rotation speed is less than predetermined target constant revolutions per minute (RPM); rotating a disk at predetermined low RPM when determining that the disk drive is at a low temperature and changing a rotation mode to a low-speed rotation mode if it is determined that the disk rotation speed is less than the predetermined target constant RPM; and spinning up the disk to the target constant RPM when determining that the temperature of the disk drive has increased and changing the rotation mode to a high-speed rotation mode if a disk rotation driving current decreases below a predetermined reference current value while the disk is rotating at the low RPM.

Abstract: A hard disk drive including: a base; a disk pivotally installed in the base to store data; an actuator installed in the base to move a read/write head to a predetermined position of the disk; a cover assembled with the base and having an air hole for making internal/external pressures of the hard disk drive equal to each other; and a breather filter interposed between the cover and the base in order to filter air introduced through the air hole of the cover. An upper portion of the breather filter is tightly coupled to the cover and a lower portion of the breather filter is tightly coupled to the base.

Abstract: A spindle motor includes a spindle motor hub that supports one or more disks, and has a contact area reduction portion that minimizes the area of contact between the hub and a disk when the disk is mounted to the hub. The spindle motor hub includes a hub body having a cylindrical sidewall that includes a contact section around which the disk extends and a non-contact section. The non-contact section is constituted by the contact area reduction portion. An outer diameter of the cylindrical hub body at the contact section is greater than an outer diameter of the cylindrical hub body at the contact area reduction portion of the non-contact section.

Abstract: A disk drive includes a base member, a spindle motor installed on the base member to rotate a disk for data storage, an actuator installed on the base member to move a read/write head to a predetermined position on the disk, a cover member assembled to an upper portion of the base member, and a noise reducing apparatus. The noise reducing apparatus includes a groove formed on an outer surface of the cover member to a predetermined depth, a plurality of through holes formed on a bottom surface of the groove, a sound-absorbing member accommodated in the groove to absorb noise generated from the inside of the disk drive, and a cover plate attached to the outer surface of the cover member to cover the sound-absorbing member.

Abstract: A method and apparatus for controlling a rotation of a motor in a disk drive. The method includes: performing spin-up when the disk drive is operating and determining whether a disk rotation speed is less than predetermined target constant revolutions per minute (RPM); rotating a disk at predetermined low RPM when determining that the disk drive is at a low temperature and changing a rotation mode to a low-speed rotation mode if it is determined that the disk rotation speed is less than the predetermined target constant RPM; and spinning up the disk to the target constant RPM when determining that the temperature of the disk drive has increased and changing the rotation mode to a high-speed rotation mode if a disk rotation driving current decreases below a predetermined reference current value while the disk is rotating at the low RPM.

Abstract: Provided is a spindle motor for a hard disk drive (HDD). The spindle motor includes a shaft, a stator and a rotator coupled to an outer circumference of the shaft, and a height adjustment member detachably installed on the rotator and adjusting the height of the rotator when the number of data storage disks mounted on the spindle motor is changed. The spindle motor further includes a plurality of spacers mounted around outer circumferences of the height adjustment member and the rotator in order to maintain a distance between adjacent disks, a clamp disposed over the height adjustment member and fixing the disks and the spacers, and a clamping screw coupled to an upper end portion of the spindle motor and fixing the height adjustment member and the clamp. Accordingly, since the height of the rotator can be adjusted using the height adjustment member, the number of disks mounted on the rotator can be changed.

Abstract: A hard disk drive including: a base; a disk pivotally installed in the base to store data; an actuator installed in the base to move a read/write head to a predetermined position of the disk; a cover assembled with the base and having an air hole for making internal/external pressures of the hard disk drive equal to each other; and a breather filter interposed between the cover and the base in order to filter air introduced through the air hole of the cover. An upper portion of the breather filter is tightly coupled to the cover and a lower portion of the breather filter is tightly coupled to the base.

Abstract: A disk drive includes a base member, a spindle motor installed on the base member to rotate a disk for data storage, an actuator installed on the base member to move a read/write head to a predetermined position on the disk, a cover member assembled to an upper portion of the base member, and a noise reducing apparatus. The noise reducing apparatus includes a groove formed on an outer surface of the cover member to a predetermined depth, a plurality of through holes formed on a bottom surface of the groove, a sound-absorbing member accommodated in the groove to absorb noise generated from the inside of the disk drive, and a cover plate attached to the outer surface of the cover member to cover the sound-absorbing member.

Abstract: In a hard disk drive, at least one groove is formed in any of the base plate and the cover plate to pump air toward an outer side of the disk. An outer end of the groove is located at a position inwardly separated from an edge of the disk such that an air journal zone of predetermined width is formed along a circumferential direction of the disk between the outer end of the groove and the edge of the disk. The groove is formed in multiple numbers in a circumferential direction of the disk at a predetermined interval and is extended in a radial direction from an inner side of the disk and curved in a direction in which the disk rotates. Thus, vibration of the disk is reduced by a damping operation of air pumped by the groove having a high pressure in the air journal zone.

Abstract: In a hard disk drive, at least one groove is formed in any of the base plate and the cover plate to pump air toward an outer side of the disk. An outer end of the groove is located at a position inwardly separated from an edge of the disk such that an air journal zone of predetermined width is formed along a circumferential direction of the disk between the outer end of the groove and the edge of the disk. The groove is formed in multiple numbers in a circumferential direction of the disk at a predetermined interval and is extended in a radial direction from an inner side of the disk and curved in a direction in which the disk rotates. Thus, vibration of the disk is reduced by a damping operation of air pumped by the groove having a high pressure in the air journal zone.