| 摘要 |
<p>An apparatus is disclosed for uniformly illuminating a light valve. The apparatus includes a light source (4) having an angular aperture u, and a light transmitting tunnel (2). The tunnel (2) has a rectangular cross section of smaller inside dimensions, N, a length L, an entrance end and an exit end, wherein L = kN/tan(u), k being a constant in the range of 1.5 to 3. The light valve is disposed at the exit end of said light tunnel (2) to receive light transmitted by said light tunnel (2). The apparatus includes, between the light source (4) and the entrance end of the light tunnel (2) or between the exit end of the tunnel (2) and the light valve, means for filtering (101) and directing light from the source (4) or from the exit end of the tunnel (2). <IMAGE></p> |
