| 摘要 |
PCT No. PCT/SE89/00127 Sec. 371 Date Sep. 27, 1990 Sec. 102(e) Date Sep. 27, 1990 PCT Filed Mar. 13, 1989 PCT Pub. No. WO89/09428 PCT Pub. Date Oct. 5, 1989.A covering element consisting of transparent material is designed with an electro-chromatic layer for control of the transmission of light through the covering element. An electrical power which is required for control of the electro-chromatic layer is obtained from a photo-electric layer integrated in the covering element. The photo-electric layer is arranged outside the electro-chromatic layer. By means of the arrangement, when the light is at its most intensive, a high voltage is obtained from the photo-electric layer and can be transferred to the electro-chromatic layer so as to in this connection reduce, at least to a considerable extent, the transmission through the covering element. The arrangement can, within vehicle technology for example, be used in a sun-roof in order to prevent heating up of an interior space in sunny weather. By means of the arrangement, the transmission is automatically adapted according to the light. The arrangement also leads to the complete elimination of the risk that the vehicle battery will be discharged, since all the energy which is supplied to the electro-chromatic layer is generated in the photo-electric layer.
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