Optical device attached to helmet - provides rear vision and comprises reflection and translation units

摘要

The optical device provides an observer with optical information originating behind him. An optical system of magnification of one is attached to a helmet (1) which the observer wears. The system comprises various mirrors positioned in front of the helmet opening and light rays from behind the observer undergo reflection combined with translation. An optical element ensures that the eye pupil (14) coincides with the input pupil of the optical unit. This unit has a magnification of -1. The device may comprise two Petzval objectives on either side of the mirror system.