| 摘要 |
<p>The lamp unit 100 comprises a mounting 2, 3, 4, 5 for a bulb 1, and an aperture ring 19, defining an exit aperture. A reflector 10 is positioned to reflect light from the bulb 1 to generate a light beam which is directed towards the exit aperture. The light beam converges at a point between the reflector 10 and the aperture ring 19 so that a divergent beam leaves the unit 100. The reflector 10 is supported by a ring 12 integral with a slider 13 which is slidable on the frame 3. Movement of the slider 13 moves the reflector 10 with respect to the bulb 1, and moves the point of convergence towards or away from the aperture ring 19. The divergence of the resultant beam is thereby changed.</p> |
