| 摘要 |
<p>A light source (1) includes a lamp (5), an aperture (11) to direct light through a pair of spaced apart focusing lenses (21, 22). An adjustable lens mounting arrangement (8) moves the lenses (21, 22) toward and away from the aperture (11) to focus light output from the light source (1) at different distances. The lens mounting arrangement (8) simultaneously moving each of the lenses (21, 22) at different linear rates.</p> |
