Abstract: A fan includes, an impeller having propeller-shaped blades, a motor disposed inside of a hub to rotationally drive the impeller centered on the rotation axis, a tubular air duct forming an air passage on a periphery of the blades of the impeller and the rotation axis, wherein the rotation axis penetrates the inside of the air duct, and an exhaust outlet larger than an outer diameter of a rotation trajectory of the blades is formed on one end of the air duct, and an air flow guiding plate blocking an opening on an other end of the air duct in the rotation axis direction, a suction inlet through which the rotation axis passes being formed in approximately the center of the air flow guiding plate, wherein the blades are closer to the air flow guiding plate than the air duct.

Abstract: A fan including, an impeller to which a plurality of propeller-shaped blades are attached on a side surface of a substantially cylindrical huh centered on a rotation axis, a motor disposed inside of the hub operable to rotationally drive the impeller centered on the rotation axis, a tubular air duct operable to form an air passage on a periphery of the blades of the impeller and the rotation axis, wherein the rotation axis penetrates the inside of the air duct, and an exhaust outlet which is larger than an outer diameter of a rotation trajectory of the blades is formed on one end of the air duct in the rotation axis direction, and an air flow guiding plate provided to block an opening on an other end of the air duct in the rotation axis direction, a suction inlet through which the rotation axis passes being formed in approximately the center of the air flow guiding plate, wherein the blades are closer to the air flow guiding plate than the air duct.

Abstract: A receptacle that can detect the insertion and extraction of a plug includes: a receptacle shell having formed therein a plug insertion port into which the plug is inserted and from which the plug is extracted; a receptacle body provided inside the receptacle shell; a movable contact that is installed at a base portion of the receptacle body, the base portion faces a distal end of the plug inserted into the plug insertion port, and that is deformed elastically when pushed by the plug; and an immovable contact that is installed at the base portion, is normally spaced from the movable contact, and comes into contact with the movable contact when the movable contact is pushed by the plug and elastically deformed. The receptacle that can conform to the HDMI standard can be realized without adding any modification to main components relating to mating with a plug.