Patent ID: 8760987

Claim:
An optical disc drive device comprising: a metallic exterior casing; and an internal unit to be housed in the exterior casing so as to be completely surrounded by the exterior casing in all directions, the internal unit including an optical pickup unit for performing recording or reproduction of information signals on an optical disc, and a printed wiring substrate having a mounting surface on which a connector electrically connected to the optical pickup unit and configured to transmit and receive electrical signals from and to external electronic equipment is mounted, wherein: the exterior casing has an opening, the connector protruding through the opening from an interior of the exterior casing to an exterior of the exterior casing, the printed wiring substrate has an annular ground pattern formed on the mounting surface of the printed wiring substrate, the annular ground pattern being configured to surround the connector at the mounting surface, and a surrounding fringe portion of the exterior casing surrounding the opening of the exterior casing is in electrical contact with the annular ground pattern so as to reduce a release of radiation noise from the interior of the exterior casing to the exterior of the exterior casing between the connector and the opening of the exterior casing.