Abstract: A projector includes a light-source device, a discharge duct having an air intake port facing the light-source device and a discharge port, an axial fan mounted between the air intake port and the light-source device in an outer casing. The discharge port has an opening area smaller than that of the air intake port and is eccentric to the air intake port. The direction of air flow from the axial fan is inclined with respect to the direction of the discharge of a cooling air from the discharge port. Accordingly, when the cooling air that has cooled a light source lamp is discharged through the discharge duct with the axial fan, the light blocking effect can be increased and the discharge pressure of the cooling air discharged can be increased.

Abstract: While a ring gear shaft 126 linked with a drive shaft rotates, a power output apparatus 110 applies a torque to a first motor MG1 attached to a sun gear shaft 125, thereby abruptly increasing a revolving speed of an engine 150, to which a fuel injection is stopped. A torque generated by a frictional force of, for example, a piston in the engine 150 and working as a reaction is applied as a braking torque to the ring gear shaft 126 via a planetary gear 120. The magnitude of the braking torque depends upon the frictional force of, for example, the piston and can be controlled by regulating the revolving speed of the engine 150 by means of the first motor MG1. This control procedure enables the energy consumed by the engine 150 to be output as a braking force to the drive shaft.

Abstract: The solar cell of the present invention includes a titanium dioxide semiconductor that is held between a pair of electrodes so that the titanium dioxide semiconductor and at least one of the electrodes form a rectification barrier.