Abstract: To reduce abnormal sound produced by contact between a clamper and a turntable between which hold and sandwich a disk. When a magnet provided for a turntable and a magnetic substance for a clamper provided for the clamper in a vertically movable manner are attracted toward each other by a magnetic force, a protrusion formed in an underside of the clamper pushes the turntable, which causes a curved part of the clamper to deform and causes the magnetic substance for the clamper to move in an opposite direction against the attraction toward the magnet by the magnetic force. This allows the curved part to attenuate impact accompanying the contact between the clamper and the turntable.

Abstract: The present invention provides a damper comprising a circular dish-shaped bottom surface portion for pressing an optical disk, an annular magnet member provided at a central portion of an upper surface of the bottom surface portion, a plurality of base pieces spaced apart from each other and disposed around the magnet member, a plurality of elastic arm pieces bent and extending in the same direction from the respective base pieces, and substantially horizontal stopper fins provided at tip portions of the respective arm pieces and protruding in a radially outward direction of the bottom surface portion. A stroke (vertical movement) of the damper in association with a loading/unloading action of a tray, which allows the optical disk to be placed, is secured by a helical movement action along the arm pieces, thereby reducing a thickness of the damper for sandwiching and holding the optical disk.

Abstract: The invention provides a practical optical disk device having a downsized means for elevating a movable chassis including a pickup and a turntable, wherein the movable chassis is positioned stably while recording or reproducing data. A movable chassis 20 can be moved up and down via a supporting point 52 provided on a rear side 21, and has two projections 23 formed on a front wall 22 of the movable chassis 20, wherein one of the projections 23 is slidably engaged with a guidance slot 41 formed to an elevating plate 40 opposed thereto, by which the movable chassis 20 is moved up and down, and the other projection 23 is engaged with an engagement groove 47 formed separately from the slot when the first projection 23 is engaged with one end of parallel portions 44 extended from both ends of the guidance slot 41 to thereby support the movable chassis 20 in a stable manner.