A ligthing device for illuminating closed environments.

摘要

The invention concerns a lighting device for illuminating a closed environment (7), comprising a light source (1) and at least one glass rod (2) which is optically and mechanically coupled thereto and extends through an enclosure wall (6), and which is provided with a light diffusor (3) at its free end. The light source (1) and at least one glass rod (2) constitute a mobile unit. At least one gastight window (10, 11) is interposed between the light source (1) and the glass rod (2). An access tube (5) passes straight through the enclosure wall (6) and opens into the environment (7) and receives and guides the mobile unit (1, 2) slidingly lodged therein. At least one cylindrical bellow (14, 15) is coupled in a gastight manner to the access tube (5) as well as to the rim of one of the windows (10, 11) and the bellow is dimensioned such as to allow the diffusor (3) to penetrate into the environment (7) and to be retracted therefrom. This device has been conceived to illuminate the toroidal chamber of a TOKAMAK fusion experiment.