Abstract: A speaker includes: a diaphragm; and a damper configured to adjust vibration of the diaphragm and including a first and second metal plates having polarities that are different from each other and symmetrical with each other, wherein the damper further includes first and second deformation prevention members disposed on bottom surfaces of the first and second metal plates, respectively, and wherein first and second deformation prevention members protrude downward and extend along a major-axis direction of the diaphragm, and the first and second deformation members are configured to prevent deformation of diaphragm caused by a vertical load.

Abstract: A speaker unit includes a magnet having poles and generating magnetic flux, and a yoke part forming a path of the magnetic flux and including a first yoke extending from one of the poles, a second yoke extending from another one of the poles, and magnetic gaps disposed between the first yoke and the second yoke. The speaker unit further includes a voice coil disposed between the magnetic gaps and moving when applied with an electric current, and a diaphragm generating sound pressure while vibrating according to the movement of the voice coil. The first yoke includes magnetic plates protruding toward the second yoke, and the magnetic plates have thicknesses different from each other.

Abstract: A speaker includes: a diaphragm; and a damper configured to adjust vibration of the diaphragm and including a first and second metal plates having polarities that are different from each other and symmetrical with each other, wherein the damper further includes first and second deformation prevention members disposed on bottom surfaces of the first and second metal plates, respectively, and wherein first and second deformation prevention members protrude downward and extend along a major-axis direction of the diaphragm, and the first and second deformation members are configured to prevent deformation of diaphragm caused by a vertical load.

Abstract: A speaker unit includes a magnet having poles and generating magnetic flux, and a yoke part forming a path of the magnetic flux and including a first yoke extending from one of the poles, a second yoke extending from another one of the poles, and magnetic gaps disposed between the first yoke and the second yoke. The speaker unit further includes a voice coil disposed between the magnetic gaps and moving when applied with an electric current, and a diaphragm generating sound pressure while vibrating according to the movement of the voice coil. The first yoke includes magnetic plates protruding toward the second yoke, and the magnetic plates have thicknesses different from each other.

Abstract: A disc-visible type disk drive apparatus is disclosed. The disk drive apparatus includes: a main body casing having a first slot provided at a first side surface to load a disc; a protection cover having a first cover provided on the first side surface of the main body casing, wherein the first cover covers a portion of the disc exposed outside the main body casing through the first slot and forms a passage through which the disc passes during loading and unloading; a disc detecting sensor disposed in the first cover which detects the disc; and a disc loading unit disposed in the main body casing and having a loading roller which is driven so as to load the disc if the disc is detected by the disc detecting sensor.

Abstract: A disc-visible type disk drive apparatus is disclosed. The disk drive apparatus includes: a main body casing having a first slot provided at a first side surface to load a disc; a protection cover having a first cover provided on the first side surface of the main body casing, wherein the first cover covers a portion of the disc exposed outside the main body casing through the first slot and forms a passage through which the disc passes during loading and unloading; a disc detecting sensor disposed in the first cover which detects the disc; and a disc loading unit disposed in the main body casing and having a loading roller which is driven so as to load the disc if the disc is detected by the disc detecting sensor.

Abstract: An optical disc drive to prevent entry of dust through a front side of a tray and includes a housing including a first opening, a shielding member disposed to shield the first opening at a distance from a front side of the housing, and including a second opening, and a tray inserted in the first and the second openings to shield the second opening and loaded into and unloaded from the housing. Thus, since sponge or padding is not dedicatedly used, cost can be saved. In addition, since the manufacturing process is simplified, productivity can be improved.

Abstract: An optical disc drive includes a main chassis, a deck unit mounted on the main chassis to move upward and downward, and a slider installed movably on the main chassis. The slider moves the deck unit upward and downward while moving on the main chassis and an impact absorbing member, interposed between the slider and the deck unit, absorbs an impact transmitted to the deck unit.

Abstract: An optical disc drive to prevent entry of dust through a front side of a tray and includes a housing including a first opening, a shielding member disposed to shield the first opening at a distance from a front side of the housing, and including a second opening, and a tray inserted in the first and the second openings to shield the second opening and loaded into and unloaded from the housing. Thus, since sponge or padding is not dedicatedly used, cost can be saved. In addition, since the manufacturing process is simplified, productivity can be improved.

Abstract: An optical disc drive has an improved vibration preventing device. A main chassis has opposite sidewalls and first and second mold tension parts integrally formed with the sidewalls, respectively. A pickup deck has a turn table adapted to receive a disc and a pickup moving in a radial direction of the disc and mounted to the main chassis to move up and down. A sub chassis has first and second mold tension guide parts mounted on a front of the pickup deck and supported by and under the first and the second mold tension parts. A disc tray moves inwardly and outwardly with respect to the main chassis. The mold tension guide parts of the sub chassis are elastically supported by the mold tension parts of the main chassis in an up-position of the pickup deck, thereby absorbing external impacts and inner vibrations.

Abstract: An optical disc changer having a main body, a tray slidably installed in the main body, a roulette rotatably installed at the tray to accommodate a plurality of optical discs, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, and a damping unit to absorb shock when the tray is loaded in and unloaded from the main body to prevent defective reproduction of data from the optical disc.

Abstract: An optical disc drive includes a main chassis, a deck unit mounted on the main chassis to move upward and downward, and a slider installed movably on the main chassis. The slider moves the deck unit upward and downward while moving on the main chassis and an impact absorbing member, interposed between the slider and the deck unit, absorbs an impact transmitted to the deck unit.

Abstract: An optical disc changer having a main body, a tray slidably installed in the main body, a roulette rotatably installed at the tray to accommodate a plurality of optical discs, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, and a damping unit to absorb shock when the tray is loaded in and unloaded from the main body to prevent defective reproduction of data from the optical disc.

Abstract: An optical disc drive has an improved vibration preventing device. A main chassis has opposite sidewalls and first and second mold tension parts integrally formed with the sidewalls, respectively. A pickup deck has a turn table adapted to receive a disc and a pickup moving in a radial direction of the disc and mounted to the main chassis to move up and down. A sub chassis has first and second mold tension guide parts mounted on a front of the pickup deck and supported by and under the first and the second mold tension parts. A disc tray moves inwardly and outwardly with respect to the main chassis. The mold tension guide parts of the sub chassis are elastically supported by the mold tension parts of the main chassis in an up-position of the pickup deck, thereby absorbing external impacts and inner vibrations.

Abstract: A disc guide device for guiding and placing a disc cartridge and a bare disc in a predetermined position on a tray of a disc player. When a bare disc is loaded on the tray, a guide portion is projected through and above a guide hole by the elastic force of a spring to contact the circumference of the disc. When a disc cartridge is loaded on the tray, a protrusion is inserted into a reference hole, and the guide portion is pressed down by the disc cartridge and buried below the guide hole. Since the device guiding the disc cartridge and the device guiding the bare disc are integrated in the disc guide device, it is possible to fabricate the disc guide device with fewer parts, lower material cost, and with a simpler structure.

Abstract: An optical disc changer includes a main body, a tray installed in the main body to be capable of sliding, a roulette rotatably installed at the tray and where a plurality of optical discs are accommodated, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, a drive gear member installed at the main body, rotated by being connected to a drive unit, and selectively engaged with a rack gear member formed on the bottom surface of the tray, and a tray gear unit installed adjacent to the drive gear member and having a tray gears selectively engaged with the rack gear member and the drive gear member.

Abstract: An optical disc changer having a main body, a tray slidably installed in the main body, a roulette rotatably installed at the tray to accommodate a plurality of optical discs, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, and a damping unit to absorb shock when the tray is loaded in and unloaded from the main body to prevent defective reproduction of data from the optical disc.

Abstract: A disc guide device for guiding and placing a disc cartridge and a bare disc in a predetermined position on a tray of a disc player. When a bare disc is loaded on the tray, a guide portion is projected through and above a guide hole by the elastic force of a spring to contact the circumference of the disc. When a disc cartridge is loaded on the tray, a protrusion is inserted into a reference hole, and the guide portion is pressed down by the disc cartridge and buried below the guide hole. Since the device guiding the disc cartridge and the device guiding the bare disc are integrated in the disc guide device, it is possible to fabricate the disc guide device with fewer parts, lower material cost, and with a simpler structure.

Abstract: An optical disc changer includes a main body, a tray installed in the main body to be capable of sliding, a roulette rotatably installed at the tray and where a plurality of optical discs are accommodated, an optical pickup device to selectively reproduce one of the optical discs accommodated on the roulette, a drive gear member installed at the main body, rotated by being connected to a drive unit, and selectively engaged with a rack gear member formed on the bottom surface of the tray, and a tray gear unit installed adjacent to the drive gear member and having a tray gears selectively engaged with the rack gear member and the drive gear member.

Abstract: A roulette driving apparatus used with a roulette-type disc changeable player to rotate a roulette where a plurality of discs are loaded, including a motor, a worm gear installed on the rotation shaft of the motor, and a driving gear rotating in a state in which it is geared to the worm gear and to a gear provided on the roulette, transmitting power generated from the motor to the roulette. Since the roulette driving apparatus used with a roulette-type disc changeable player is configured to transmit power from a motor directly to a roulette through a worm gear and a driving gear, the number of parts can be greatly reduced compared to the conventional apparatus. Also, since the number of power transmission steps is reduced, the reduction ratio is reduced so that a desired angle of rotation of the roulette can be achieved by driving the motor to a lesser extent, thereby considerably reducing noise generated by driving the roulette.