Helmet mounted display systems.

摘要

A head-up display comprises a headgear mounted visor (12) having a viewing area (54) which, when the headgear (38) is being worn is in, or is movable to be in, the line of sight of the wearer, and image generating means (42, 44) arranged to direct light first to a parabolic mirror (48), then to first (50) and second (52) fold mirrors, hand then to the viewing area (54) and into an eye (56) of the wearer. Such an arrangement enables the size of the visor to be smaller than those of the prior art.