| 摘要 |
A collector includes a convergent lens (2) having a focal distance f and an image focal plane (PFI). The convergent lens (2) defines one of the walls of a casing (1) defined by two pairs of side walls (4a, 4c), a bottom wall (3) and a front wall defined by the lens (2), the side and bottom walls on the inside of the casing being reflective, and the depth p of the casing being lower than the focal distance f of the lens so that after multiple reflections, the ray beam (R1, R2) thus reflected is concentrated on a final image focus (I') located inside the casing, the collector including a mobile receptor (6a) held inside the concentrated beam or in a position at least intersecting the beam by elements controlling the movement of the collector (6a) with that of the beam.
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