| 摘要 |
An expansion device connected to a host device to thereby expand the functions thereof. Even when source power is not supplied from the host device, this expansion device, such as a bay unit, enables reproduction of an audio disk inserted thereinto. The bay unit used by being connected to the host device, in a state in which a recording/reproducing device capable of reproducing digital signals and audio signals is accommodated in a bay, has an operation panel for operating the recording/reproducing device, an audio circuit, which includes an amplifying circuit, a speaker, and a volume control, and a second power input portion to be connected to an existing power supply circuit. Further, source power is supplied thereto from the second power input portion. This enables the recording/reproducing device and the audio circuit to operate even when no source power is supplied from the existing power supply circuit, for example, when the power supply for the host device is turned off, and when the bay unit is disconnected from the host device. A battery incorporated in the bay unit may be connected to the second power input portion.
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