Abstract: A variable valve lift actuator of an engine includes a first body that rotates within a predetermined angular range; a second body connected to or disconnected from the first body; a latching pin configured to project to or retract from the first body by passing through the second body to connect or disconnect the first body and the second body; a drive module connected to the latching pin through a connecting member to project or retract the latching pin; a rotary shaft disposed above the valve across both side walls of the first body and the second body such that the first body is rotatable; and a return spring installed on the rotary shaft to provide a restoring force to return the first body rotated by the high-speed cam to an original position thereof.

Abstract: Provided is a variable valve lift actuator of an engine, which includes: a first body rotating; a second body; a driving module; and a return spring, wherein an entire portion or a partial front end of the driving module is inserted into a rear end of the second body, the lift degree of the valve is variably controlled in two stages of a high-speed mode and a low-speed mode based on an operating condition of the engine, and when only the high-speed cam is installed on the camshaft, the driving pin is operated in a low-speed and low-load state of the engine to separate the first body from the second body so as to deactivate a cylinder.

Abstract: Provided is a variable valve lift actuator of an engine, which includes: a first body rotating; a second body; a driving module; and a return spring, wherein an entire portion or a partial front end of the driving module is inserted into a rear end of the second body, the lift degree of the valve is variably controlled in two stages of a high-speed mode and a low-speed mode based on an operating condition of the engine, and when only the high-speed cam is installed on the camshaft, the driving pin is operated in a low-speed and low-load state of the engine to separate the first body from the second body so as to deactivate a cylinder.

Abstract: A variable valve lift actuator of an engine includes a first body that rotates within a predetermined angular range; a second body connected to or disconnected from the first body; a latching pin configured to project to or retract from the first body by passing through the second body to connect or disconnect the first body and the second body; a drive module connected to the latching pin through a connecting member to project or retract the latching pin; a rotary shaft disposed above the valve across both side walls of the first body and the second body such that the first body is rotatable; and a return spring installed on the rotary shaft to provide a restoring force to return the first body rotated by the high-speed cam to an original position thereof.

Abstract: A cover plate for an optical disk drive designed to reduce disk vibrations and noise is provided. The cover plate is installed above a main frame of the optical disk drive and has a through hole in the center through which a disk clamp for clamping a disk placed on a turntable is fitted and a projection formed to oppose the disk up to a predetermined height in order to narrow a gap with the disk. Furthermore, the cover plate has a circular step formed opposite a surface corresponding to an outer circumference of the disk in the shape of an annular groove for lowering acoustic energy density of noise. The cover plate constructed in this way reduces disk vibration due to air damping effects resulting from a narrow gap between the disk and the cover plate while suppressing noise due to the presence of the abruptly expanded portion. Furthermore, the cover plate can be implemented without a separate device by making simple changes to the structure of cover plate.

Abstract: A dynamic vibration absorber for a disk player includes a deck base, a deck plate movably disposed on the deck base to support a spindle motor that spins a disk, a mass body disposed around the deck plate, and a flexibly changeable connection member that connects the deck plate and the mass body. A dynamic vibration absorber including the mass and connection member reduces vibration generated when the disk spins using a reciprocal action of the mass body and the connection member relative to the deck plate.

Abstract: A cover plate for an optical disk drive designed to reduce disk vibrations and noise is provided. The cover plate is installed above a main frame of the optical disk drive and has a through hole in the center through which a disk clamp for clamping a disk placed on a turntable is fitted and a projection formed to oppose the disk up to a predetermined height in order to narrow a gap with the disk. Furthermore, the cover plate has a circular step formed opposite a surface corresponding to an outer circumference of the disk in the shape of an annular groove for lowering acoustic energy density of noise. The cover plate constructed in this way reduces disk vibration due to air damping effects resulting from a narrow gap between the disk and the cover plate while suppressing noise due to the presence of the abruptly expanded portion. Furthermore, the cover plate can be implemented without a separate device by making simple changes to the structure of cover plate.

Abstract: A disk-type recording for protection of media recording and/or reproduction units, including an information recording surface portion disposed around a center hole and a crack hindering element to hinder the generation of a crack at the center hole from advancing to an outer edge of the disk-type recording media. The crack hindering element includes at least one annular protrusion portion protruded around the center hole.

Abstract: A dynamic vibration absorber for a disk player includes a deck base, a deck plate movably disposed on the deck base to support a spindle motor that spins a disk, a mass body disposed around the deck plate, and a flexibly changeable connection member that connects the deck plate and the mass body. A dynamic vibration absorber including the mass and connection member reduces vibration generated when the disk spins using a reciprocal action of the mass body and the connection member relative to the deck plate.

Abstract: A disk-type recording for protection of media recording and/or reproduction units, including an information recording surface portion disposed around a center hole and a crack hindering element to hinder the generation of a crack at the center hole from advancing to an outer edge of the disk-type recording media. The crack hindering element includes at least one annular protrusion portion protruded around the center hole.