Patent ID: 8128556

Claim:
A body-insertable apparatus comprising: an illuminating unit that illuminates the inside of a subject's body; an imaging unit that takes an image of the inside of the subject's body; a first power supplying unit that supplies electric power to the imaging unit; a second power supplying unit that supplies electric power to the illuminating unit; and a switch that either connects the first power supplying unit to the second power supplying unit or disconnects the first power supplying unit from the second power supplying unit, wherein the switch electrically separates the first power supplying unit from the second power supplying unit during at least an illuminating period of the illuminating unit, the electric power for the illuminating unit is supplied from only the second power supplying unit during the illuminating period of the illuminating unit, the second power supplying unit includes a plurality of charge storage units and a plurality of switches that switch a connection state between the charge storage units to either a series connection or a parallel connection, the plurality of switches switch the connection state between the charge storage units to the series connection during at least the illuminating period of the illuminating unit, and the plurality of switches switch the connection state between the charge storage units to the parallel connection during at least a part of the period other than during the illuminating period of the illuminating unit, and the charge storage units store therein the electric power received from the first power supplying unit during at least the part of the period other than during the illuminating period of the illuminating unit and supplies the stored electric power to the illuminating unit during at least the illuminating period of the illuminating unit.