| 摘要 |
A spotlight for generating an output light beam ( 9 ) of variable width, including a light source ( 1 ) having a selected focal length, and an aperture ( 3 ) for directing light from said light source to a first lens ( 5 ), said first lens ( 5 ) being movable to adjust the width of said output light beam ( 9 ), wherein the first lens ( 5 ) is moveable to a position closely adjacent to said aperture ( 3 ) and substantially about or at said selected focal length (FL) to minimize said output light beam width.
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