Patent ID: 8807761

Claim:
A lamp unit for a projector, the projector which is used in at least two mounting states, comprising: a discharge lamp; and a cooling air discharge section having a cooling air exit partitioned into three discharge ports by two partition plates, the cooling air discharge section discharging cooling air toward the discharge lamp, the discharge of cooling air from the discharge ports being controlled according to the at least two mounting states, the cooling air discharge section including: a ball which moves by its own weight according to the mounting states of the projector; and a first discharge port, a second discharge port, and a third discharge port for the cooling air, wherein: the ball moves by its own weight according to a first mounting state and reduces an air flow of the cooling air passing through the first discharge port, and the ball moves by its own weight according to a second mounting state and reduces an air flow of the cooling air passing through the second discharge port.