| 摘要 |
<p>The invention concerns a helmet comprising a night vision system (6, 7). an image generator (2), a combining glass (8) for combining the light rays derived from the night vision system and the light rays derived from the image generator, and a fixed optic (3) downstream of the combining glass. The night vision system and combining glass assembly (6, 7, 8) is removable, and a substitute optic can be inserted, for day vision, in place of the assembly (6, 7, 8). The substitute optic has the same optical characteristics as the combining glass (8) but it has a transmission coefficient higher than that of the combining glass. The substitute optic is optimised for day vision. The combining glass is optimised for night vision: The invention is applicable to the helmets of pilots of armed helicopters or armed aircraft.</p> |
