Optical disk and recording/reproduction apparatus using the same

摘要

An optical recording disk intended only for the reproduction of a main information and used by an information management system has the attachment of a memory (3) in which data for the management of the main information is written and read out easily and reliably. The memory has associated electromagnetic coupling means (10,11) for transacting the record management data with and receiving power from a recording/reproduction apparatus. The electromagnetic coupling means is built in the memory or disposed in an annular or spiral form on the disk. The transmission frequency band for data transaction and power supply is set outside the main information reproduction frequency band. The memory is disposed in or on an appropriate plastic layer of the disk depending on the usage of the disk, and located in the inner or outer section of the recording medium forming area on the disk depending on the transmission band. This low-cost optical disk can be manufactured at a high reliability and high yield.