Abstract: A nonvolatile memory system includes a memory controller for copying a mapping data group including logical-physical address mapping information regarding user data from a nonvolatile memory to a mapping information storage unit, and transmit size information regarding the mapping data group to a host. The host may receive size information regarding the mapping data group from the nonvolatile memory system, and determine the order of commands to be transmitted to the nonvolatile memory based on the size information regarding the mapping data group.

Abstract: A power transmission mechanism using metal belts including a driving pulley having first and second driving pulley-halves capable of advancing and retreating in an axial direction of a driving axis, the first and second driving pulley-halves having first and second belt guiding portions formed thereon to face each other, respectively, a driven pulley having first and second driven pulley-halves installed at a driven axis parallel to the driving axis to be capable of advancing and retreating along the driven axis, the first and second driven pulley-halves having third and fourth belt guiding portions formed thereon to face each other, respectively; and at least two metal belts capable of circulating around the belt guiding portions of the driving pulley and the driven pulley without interference, wherein each of the belt guiding portions is formed of an inclined surface having a predetermined curvature such that angular velocities of all belts can be identical at an arbitrary speed rate between the driving pul

Abstract: An apparatus for picking up a video signal recorded on a recording medium and copying a frequency modulated signal without demodulation. In the apparatus, a high-pass filter separates a high-frequency modulated luminance signal from the modulated video signal by setting a cutoff frequency higher than a frequency band of a low frequency converted color signal. A limiter receives an output signal of the high-pass filter and limits variation of the amplitude of the output of the high-pass filter to a predetermined level. A first feature compensator receives the output signal of the limiter and corrects high frequency characteristics of the signal. A low-pass filter separates a low frequency converted color signal and a low-frequency modulated luminance signal, each having a frequency that is lower than the cutoff frequency, from the modulated video signal. A gain controller receives an output signal of the low-pass filter and maintains the received signal at a constant level.

Abstract: In an optical disk drive having an eccentricity correction device for correcting the eccentricity of a disk loaded on a turntable, a central ring is installed on the turntable to move the disk loaded on the turntable by a predetermined distance from the center of rotation of the turntable, and the central ring is properly moved by a moving mechanism. Therefore, the eccentricity of the disk can be precisely corrected, and, when a pickup records or reproduces information, the time for tracking can be sharply reduced and tracking errors can be prevented.

Abstract: An optical pick-up driving device includes: a base; a rotary arm installed with respect to the base and operative to rotate around a first guide pin; a rotation driving mechanism, arranged along the rotary arm and said base, for rotating the rotary arm; an optical pick-up assembly coupled with the rotary arm and operative to rotate around a second guide pin; and an interlocking mechanism for rotating the optical pick-up assembly and which is interlocked with the rotation of the rotary arm. Another optical pick-up driving device includes: a base; an optical pick-up rotatably supported by the base; a rotation driving unit for rotating the optical pick-up; and a moving unit for guiding the movement of the optical pick-up.

Abstract: A cartridge ejector of an optical disc player, which softly accomplishes ejection of the cartridge in two steps. An elastic devices, which biases a lever which makes a shutter of the cartridge open and close and ejects the cartridge, is a torsion spring having a coil portion combined at a hinge of the lever, a first support portion formed at one end of the coil portion, a second support portion formed at the other end of the coil portion, and a third support portion which is formed at the end of said second support portion, and of which selectively comes into contact with the holder.