Optical disc device including a carrier for holding optical discs in a stacked state

An optical disc device comprising:

• optical disc drives each having a tray conveyed between a recording and reproducing position and a disc replacing position through a tray discharge port formed in one surface of a casing, the optical disc drives performing at least either recording or reproduction with respect to an optical disc mounted on the tray positioned at the recording and reproducing position;
• a carrier which holds a plurality of stacked optical discs in a stacked state, the carrier being configured to mount the held plurality of optical discs on each tray of the optical disc drives, the tray being positioned at the disc replacing position, and the carrier being configured to collect the plurality of optical discs mounted on each tray in the stacked state;
• a control unit which controls operations of the optical disc drives and the carrier,
• wherein the optical disc drives are stacked in the height direction such that tray discharge ports are oriented in one direction,
• wherein the control unit performs, in parallel,
• a first control operation to convey a first tray in the optical disc drives from the disc replacing position to the recording and reproducing position, and
• a second control operation to convey a second tray adjacent to the first tray;
• from the recording and reproducing position to the disc replacing position;
• wherein when the carrier performs one of an operation of collecting the optical discs and an operation of mounting the optical discs, the control unit performs the first control in parallel with the second control, and
• wherein when the carrier performs an other of the operation of collecting the optical discs and the operation of mounting the optical discs, the control unit performs:
• a third control operation to all of the trays of the optical disc drives from the recording and reproducing position to the disc replacing position, and then
• a fourth control operation to sequentially convey the trays of the optical disc drives from the disc replacing position to the recording and reproducing position from a topmost tray to a bottommost tray.