| 摘要 |
For efficient use of light from a light source (1), a reflector (2) comprises a first paraboloid (3) (a, b) for reflecting the light from the light source (1) to form rays of light parallel to an optical axis (6),<a second paraboloid (4) (b, c) for reflecting the light from the light source (1) to form parallel rays of light deviating outside, and a bottomless frustum (5) (a-d) of a cone for reflecting the light from the second paraboloid (4) to form rays of light parallel to an optical axis (6). Despite the light source (1) in front of it, the reflector is capable of forming rays of light parallel to the optical axis (6).
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