McDermott, Will & Emery
Automatic disk change apparatus and disk tray for the apparatus
 An automatic disk changer has a recording/reproducing device capable of operating a reproducing-only disk and a recording/reproducing possible disk, disk trays that can be placed on the recording/reproducing device, and each of which has a disk-type discriminating means able to discriminate as to whether the disk could be a reproducing-only disk or a recording/reproducing possible disk, a tray storage holding the disk trays, and a tray carrier able to pullout/insert the disk trays from/into the tray storage and able to transport the disk tray to/from the recording/reproducing device. 
Matsushita Electric Industrial Co., LTD.
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Goro Yasuhisa Makoto Yoshio Kozo
Naoki Fukushima Fujita Umeda Ezawa