| 摘要 |
The present invention relates to a lamp, in particular a torch lamp, comprising, inside a casing 1 defining an optical axis 5, an electric bulb 9 with a filament 11 on the optical axis 5 and a reflector 13 in the shape of a paraboloid of revolution about the optical axis 5, and having a focus F on the optical axis 5. It is characterised in that it comprises means 10, 12, 15, 16, 27, 36, 37 for adjusting the relative position of the bulb 9 and of the reflector 13 along the optical axis 5, between a position in which the filament 11 is placed at the focus F, and at least one position in which the filament 11 is offset with respect to the focus F. It is thus possible have available, at will, a parallel light beam or a divergent beam, or possibly a convergent beam. <IMAGE>
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