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US4241390A System for illuminating an annular field 失效
用于照亮环形场的系统

System for illuminating an annular field
摘要:
This invention relates to a system for illuminating an annular field disposed about an axis characterized by an arcuate source of radiation disposed concentrically about the axis, and an annular field imaging system having an axis of symmetry coincident with said axis for forming an image of the arcuate source on the annular field.
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