Clear holographic helmet visor

Details Clear holographic helmet visor Clear holographic helmet visor

G - Physics

02

B

88/7, 88/0.14

G02B 5/32 (2006.01) G02B 23/10 (2006.01) G02B 23/14 (2006.01) G02B 27/00 (2006.01) G02B 27/01 (2006.01)

Patent

CA 1297711

-15- ABSTRACT OF THE DISCLOSURE The visor can be readily mounted on a helmet by virtue of the fact that it dispenses with the need for any optical relay system. Provision is made for a light image generator, an optical combining and collim- ating assembly in which a holographic flat plate and a holographic spherical plate are grouped together so as to provide a view of the collimated image superimposed on the landscape. The holographic spherical plate is employed off the axis and produces collimation in a pupil zone placed substantially at the focal distance of the apex of the spherical mirror. The hologram of the spherical plate is recorded by means of a digital hologram in order to minimize aberrations. The flat plate can be fairly steeply inclined with respect to the sighting axis and so designed as to reduce the ratio of parasitic reflection of the imaging channel.

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