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Device for the folding of the optical paths of two right-hand and left-hand image projectors of a binocular helmet visor with projection on visor
| Details |
Inventors: Monnier, Laurent;
Assignee: Sextant Avionique (Velizy Villacoublay, FR)
Primary Examiner: Henry; Jon W.
Assistant Examiner: Chang; Audrey
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A display system for a binocular helmet visor having image projectors projecting images on a semi-reflecting internal wall of the visor of the helmet. One image faces the right eye and another image faces the left eye. The shape of the surface of the internal wall of the visor makes it desirable to cross the optical paths of the two projectors at the helmet wearer's forehead in order to limit the deformation of the images. The optical paths of the two projectors are folded with holographic mirrors in a manner which results in a compact structure, reducing the space required for the visor and the overall weight of the helmet. |
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DETAILED DESCRIPTION The present invention is aimed at overcoming this drawback.
It is also aimed at giving a minimum length and maximum compactness to the optical paths of the image projectors of the visor.
An object of the invention is a device for the folding of the optical paths of the right-hand and left-hand images of a binocular helmet visor with projection on the visor, that intersect each other before reaching semi-reflective regions of the internal wall of the visor of the helmet, facing the helmet wearer's eyes, when said device comprises a pair of holographic mirrors, each receiving one of the optical paths at an angle of incidence close to the normal, smaller than its limit angle of reflection so that it allows itself to be crossed by this path and receiving the other optical path at a mean angle of incidence included in its reflection cone so that it reflects it and folds it before it reaches the internal wall of the visor.
According to another characteristic of the invention, the holographic mirrors are placed so as to be facing each other, symmetrically with respect to the sagittal plane, at the height of the helmet wearer's forehead, with a tilt from the normal towards the bottom of the sagittal plane.
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Optical Systems 
