Compact optical architecture for wide-field helmet-mounted display

A compact optical architecture for a wide-field helmet-mounted display comprising:

• at least one image source with a given field,
• a single-piece visor enabling projection to infinity of an image before an eye of a pilot wearing the helmet,
• at least one optical relay to convey said image between the image source and the visor, the optical relay comprising image-formation means and at least two deflection mirrors, including one forehead-mounted mirror having a given surface area, wherein:
• said visor is formed by a surface generated by revolution, of which an axis of revolution is substantially parallel to an ocular axis and substantially contained in a sagittal plane of the pilot, at a forehead level,
• the forehead-mounted mirror is not planar and has an axis of revolution that is identical to said axis of revolution of the visor, its geometrical parameters being computed such that an envelope of useful beams propagated between said forehead-mounted mirror and the a first beam-formation means of the optical relay upstream from the forehead-mounted mirror are substantially contained in a cylinder with a section substantially equal to a useful surface of said mirror.