Patent ID: 6870307

Claim:
A cooling structure of a projection tube characterized in that: a chamber in which a liquid coolant for cooling a panel surface is filled is formed on the panel surface of the projection tube, a liquid coolant is present in the chamber, the chamber is formed by the panel surface, a lens which faces the panel surface in an opposed manner, and a metal envelope which radiates heat, a first seal member is disposed between the metal envelope and the panel surface, a second seal member is disposed between the metal envelope and the lens, a holder for pressing the lens in the direction toward the metal envelope is disposed in the periphery of the lens, a pad is formed on a funnel portion of the projection tube, a sustainer for supporting the chamber is in contact with the pad, and bolts fasten the holder and the sustainer in the direction of a tube axis of the projection tube without contact to the metal envelope so as to apply pressure to the first seal member and the second seal member in the direction of a tube axis of the projection tube.