| 摘要 |
The present invention relates to a lamp for providing uniform luminosity in an area to be illuminated, such as in an operating theatre and the like, comprising generally (a) a light source, (b) a planar field, said planar field comprising a substantial number of radial sectors containing a plurality of transverse, outwardly curved prisms, and (c) a toroidal lens system which controls the divergence of the light emanating from the light source so as to render the light substantially columnate and direct the light onto the planar field. The present invention also includes structure whereby the radial sectors are held together in the planar field by attachment to one another, such as by tongue-and-groove means, and further includes (d) a transparent member located between the planar field and the area to be illuminated which protects the prism sectors from soil and injury.
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