| 摘要 |
An optical device suitable for attachment to headgear (13) such as a pilot's helmet, for use as a night vision goggle (11) wherein an image intensifier (19a or 19b) whereby radiation in the visible and/or near infra-red portions of the spectrum received from the scene to be viewed is converted to visible light is arranged so that its input (33a or 33b) and output (21a or 21b) faces are directed respectively away from and towards the scene to be viewed, light from the output face being reflected to the user's eyes by a viewing eyepiece (23a or 23b) which intercepts the user's line of sight, and the received radiation being directed onto the input face by an objective and ray-folding means (27a or 27b; 29a or 29b; 31a or 31b). A design of goggle which is lighter and has a smaller forward projection can be achieved in goggles using such optical devices. |
