| 摘要 |
A mobile lighting apparatus includes an envelope or balloon (2) which contains a frame (4) supporting an illuminating device (3) typically an electric light bulb (18) inside the envelope (2). The envelope (2) is mounted on a telescopic mast (6) supported by a movable base element (16) incorporating stabilising legs (12). The envelope (2) may be inflatable or rigid. For an inflatable envelope (2), the apparatus includes various sensors (30, 32) for sensing deformation and/or pressure in the envelope and a means to supply air or other gas to inflate the envelope. A rigid envelope formed from two conjoined sheets of acrylic deformed into dome shapes overcomes many of the problems of inflatable envelopes, in particular, their slow inflation rate, the tendency to deform due to air current, and the adverse effect of punctures. Although a fan is not required for inflation of the rigid envelope, fan forced air is preferred for cooling the electric light bulb. |
