| 摘要 |
The invention relates to an optical device for imparting an elongate shape to a light beam emitted by a LED, and to street luminaries which comprise such optical devices. The optical device comprises a lens (2) having an entry diopter (3) and an exit diopter (4) which comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections.
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