| 摘要 |
<p>A high intensity light source comprises a solid dielectric sheet (4) having its back surface in contact with a conducting medium (3) which is electrically conducted to a fixed potential (such as ground) and its front surface (5) free to receive electric charge to be electrostatically bound to the sheet (4). In one example the carge is delivered to the surface (5) by a unipolar Corona discharge arrangement having a plurality of corona sources (6) at different locations over the surface of the sheet (4). In order to generate a light output from the source (1) the electric charge built-up on the surface (5) is discharged as an electric discharge by the rapid application of a switchable voltage to at least a localised region of the surface (5).</p> |
