Abstract: A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more ?-olefins in a vapor phase in a fluidized-bed reactor, wherein the concentration of (A) a saturated aliphatic hydrocarbon in the fluidized bed reactor is 1 mol % or more and at least one compound selected from (B) an aliphatic amide and (C) a nonionic surfactant constituted only of carbon, oxygen and hydrogen atoms is made to exist in the reactor. The present invention can provide a process for producing a polyolefin, the process ensuring that the prevention of clogging caused by the generation of sheet or block polymers and a high efficiency of the production of a polyolefin due to good catalytic activity can be accomplished at the same time and also having superb continuous productivity.

Abstract: The present invention provides a disc drive apparatus capable of identifying a disc (12 cm) having a small data area (8 cm) in central as same as an ordinary 12 cm disc. The apparatus having a light receiving unit 105b and a push switch 106b The unit 105b is arranged in a position where the unit 105b detects the disc having the small data area in central when the switch 106b detects the same, and where the unit 105b does not detect a disc (12 cm) having a hole (8 cm) in central when the 106b detects the same. The apparatus also has an disc identifier for identifying type of the disc based on the detected results of the light receiving units and/or the push switches.

Abstract: The process for producing an olefinic polymer comprises introducing a saturated aliphatic hydrocarbon in a liquid phase state and in a vapor phase state into the aforementioned fluidized-bed and (co)polymerizing in the condition that when the inside radius of the cylinder section of the fluidized-bed reactor is defined as a distance of 1, the relationship between the concentration (C1) of the saturated aliphatic hydrocarbon put in a liquid state in the peripheral portion of the cylinder section at a relative distance of 0.7 to 1.0 from the center of the cylinder section as a start point and the concentration (C2) of the saturated aliphatic hydrocarbon put in a liquid state in the center portion of the cylinder section at a relative distance less than 0.7 from the center fulfills the following equation: C1>C2 at a place close to the upstream section of said gas distributing plate.

Abstract: Herein disclosed is an optical disk driving apparatus for selectively driving a plurality of optical disks, comprising: a housing; and an optical disk driving unit accommodated in the housing, the optical disk driving unit including: a turntable for selectively retaining the optical disks; a supporting member for rotatably supporting the turntable; a base plate pivotably retained by the housing; a plurality of vibration isolators for isolating the supporting member from outside vibrations by intervening between the supporting member and the base plate; a supporting member fixing mechanism for fixing the supporting member on the base plate by preventing the vibration isolators from isolating the supporting member from outside vibrations; a base plate driving mechanism for driving the base plate to pivotably move with respect to the housing; and a cam gear for transmitting a rotation torque to each of the supporting member fixing mechanism and the base plate driving mechanism.

Abstract: The olefinic polymer characterised in that the n-decane-soluble content thereof is 10% by weight or less and the content of a ligand having a cyclopentadienyl structure is 5 ppb by weight or less. The process for producing an olefinic polymer is a process of producing an olefinic polymer by (co)polymerizing olefins in a gas phase using a fluidized-bed reactor, the process comprising: a polymerization step of (co)polymerizing the olefins with allowing a saturated aliphatic hydrocarbon to exist in a concentration of 2 to 30 mol % in the fluidized-bed reactor and a ligand removing step involving a step of bringing the resulting (co)polymer into contact with a ligand-remover and a step of heating said (co)polymer which has been brought into contact with the ligand-remover.

Abstract: The process for producing an olefinic polymer comprises introducing a saturated aliphatic hydrocarbon in a liquid phase state and in a vapor phase state into the aforementioned fluidized-bed and (co)polymerizing in the condition that when the inside radius of the cylinder section of the fluidized-bed reactor is defined as a distance of 1, the relationship between the concentration (C1) of the saturated aliphatic hydrocarbon put in a liquid state in the peripheral portion of the cylinder section at a relative distance of 0.7 to 1.0 from the center of the cylinder section as a start point and the concentration (C2) of the saturated aliphatic hydrocarbon put in a liquid state in the center portion of the cylinder section at a relative distance less than 0.7 from the center fulfills the following equation: C1>C2 at a place close to the upstream section of said gas distributing plate.

Abstract: A process for producing a polyolefin according to the present invention comprises (co) polymerizing one or two or more &agr;-olefins in a vapor phase in a fluidized-bed reactor, wherein the concentration of (A) a saturated aliphatic hydrocarbon in the fluidized bed reactor is 1 mol % or more and at least one compound selected from (B) an aliphatic amide and (C) a nonionic surfactant constituted only of carbon, oxygen and hydrogen atoms is made to exist in the reactor. The present invention can provide a process for producing a polyolefin, the process ensuring that the prevention of clogging caused by the generation of sheet or block polymers and a high efficiency of the production of a polyolefin due to good catalytic activity can be accomplished at the same time and also having superb continuous productivity.

Abstract: A disc changer apparatus includes a casing. A plurality of trays are contained in the casing for carrying discs respectively. The trays are held and arranged in a stack. A region between a designated one of the trays and a tray immediately above the designated tray is expanded. A disc on the designated tray is pushed. A drive mechanism moves a turntable into the expanded region to place the turntable below the pushed disc. The drive mechanism includes a shaft, a base plate supported within the casing via the shaft, a damper, and a chassis connected to the base plate via the damper and carrying the turntable.

Abstract: A disc changer apparatus includes a casing. A plurality of trays are contained in the casing for carrying discs respectively. The trays are held and arranged in a stack. A region between a designated one of the trays and a tray immediately above the designated tray is expanded. A disc on the designated tray is pushed. A region between the designated tray and the disc on the designated tray is expanded after the disc on the designated tray is pushed. A drive mechanism moves a turntable into the expanded region between the designated tray and the disc on the designated tray to place the turntable below the pushed disc. The drive mechanism includes a shaft, a base plate supported within the casing via the shaft, a damper, and a chassis connected to the base plate via the damper and carrying the turntable.

Abstract: A loader conveys a holder, carrying thereon a disc cartridge, between a cartridge ejection position and a reproducing/recording position. The loader has an engaging part which engages with a mechanical lock mechanism so as to release a holder pin in the mechanical lock mechanism from its locked condition in order to hold a movable chassis in a floating condition with respect to a stationary chassis and to lock the holding pin in the mechanical lock mechanism so as to fix the movable chassis to the stationary chassis when the holder has been moved to the cartridge ejecting side.

Abstract: A loader conveys a holder, carrying thereon a disc cartridge, between a cartridge ejection position and a reproducing/recording position. The loader has an engaging part which engages with a lock mechanism so as to release a holder pin in the lock mechanism from its locked condition in order to hold a movable chassis in a floating condition and to lock the holding pin in the lock mechanism so as to fix the movable chassis to the stationary chassis when the holder comes to the cartridge ejecting side. When the holder is moved to the reproducing/recording position, the holding pin provided on the holder engages with a shutter closing spring so as to retract an engaging part at the front end of the shutter closing spring through an opening in the holder in order to prevent the disc cartridge from making contact with the shutter closing spring, thereby making it possible to give a satisfactory feeling of insertion of the disc cartridge and avoid damaging the disc cartridge.

Abstract: A disc player device includes a tray transfer mechanism for transferring a tray, supporting a disc thereon, from a magazine, a clamper for holding the disc, and a clamper drive mechanism for transferring the clamper to a turntable. The disc is held by the turntable with the clamper transfer mechanism held out of contact with the clamper, and in this condition a playback of the disc is carried out. After the playback of the disc is finished, the disc is again clamped, and is returned to a predetermined position by the clamper transfer mechanism. The tray transfer mechanism, the clamper, the clamper drive mechanism are driven by a common motor.

Abstract: A disk apparatus is disclosed. A movable chassis assembly having a turntable and a pickup head is detachably supported on elastic members by a stationary chassis assembly with the lock mechanism of the stationary chassis assembly engaged with lock pins disposed on the movable chassis. A holder located on the movable chassis assembly for holding a disk cartridge to load or eject the disk cartridge is transported by a loader located on the stationary chassis assembly in a predetermined transport direction. Pin driving means located in the loader disengages lock pins when the lock mechanism is touched by the pin driving means at the end of the loading operation of the disk cartridge. A pair of pivoting cross links are connected at their crossings by a support pin that is engaged with a first guide slot in the stationary chassis assembly. One end of each of the pair of cross links is slidably engaged with a guide slot in the loader.

Abstract: A loader conveys a holder, carrying thereon a disc cartridge, between a cartridge ejection position and a reproducing/recording position. The loader has an engaging part which engages with a mechanical lock mechanism so as to release a holder pin in the mechanical lock mechanism from its locked condition in order to hold a movable chassis in a floating condition with respect to a stationary chassis and to lock the holding pin in the mechanical lock mechanism so as to fix the movable chassis to the stationary chassis when the holder has been moved to the cartridge ejecting side.

Abstract: There is disclosed a disk loading device capable of transferring a disk without damaging a face of the disk. The disk loading device includes a roller movement mechanism for moving a roller toward and away from a path of transfer of the disk, and a roller drive mechanism for rotating the roller. The roller is brought by the roller movement mechanism into contact with an outer peripheral surface of the inserted disk, so that the disk is transferred by the rotational drive force of the rotating roller in a predetermined direction. For discharging the disk, the outer peripheral surface of the disk is urged by an eject mechanism operatively connected to the roller drive mechanism, so that the disk is ejected.