A light guide plate in the planar illumination device in one example of the present invention has: first connecting surfaces that respectively connect adjacent light-output surfaces; and second connecting surfaces that respectively connect adjacent opposite surfaces. The flexible piece extends peripherally from the hatch body and includes a seating portion which is adapted to be vacuum sealed to a seating region of an interior surface of the treatment chamber. The first electrode layer is electrically connected to the first semiconductor layer by filling a contact hole that passes through the second electrode layer, the second semiconductor layer, and the active layer, and the insulating layer surrounds an inner circumferential surface of the contact hole to insulate the first electrode layer from the second electrode layer. The control wheel is rotatable around an axis concentric with the pinion gear and moveable along the concentric axis to cause the pinion gear to selectively engage and disengage the rack gear, wherein rotation of the control wheel while the pinion gear is engaged with the rack gear causes the turntable to rotate relative to the base. In a medium that recordsplays back data including video data and control information, the control information includes information for accessing a specific portion of the video data.