Head-up display

Claim 1

A head-up display which does not limit an observer's field of vision for use in a carrier vehicle comprising: optical collimation and combination means for displaying display data superimposed on a landscape to an observer; electronic means for producing said display data to be displayed; and casing means for supporting said optical means and said electronic means and for attaching to the carrier vehicle; said optical means including a spherical mirror and a flat mirror which are partly transparent, said mirrors having lower edges which are juxtaposed, and upper edges spaced from one another, the display being mounted in the head-up position; a bonded thin transparent plate for assembling said juxtaposed lower edges to one another; connecting means for mechanically connecting said upper edges to said casing means, said connecting means being of a limited thickness to be substantially contained in a plane passing through said upper edges and an optical axis of said optical means at an observation point corresponding to an optical centre of the spherical mirror, said spherical mirror being used on the optical axis, wherein a light ray reflected by said flat mirror toward said spherical mirror is again reflected by said spherical mirror in substantially a same axis as said first reflected light ray, but in an opposite direction whereby there is no masking effect in the observation field located below said connecting part which connects said upper edges, thereby eliminating any masking effect below the upper edges of said mirrors, said electronic means being at least partly contained in said casing means whose shape is predetermined so that it is located in a space already masked for the observation of the landscape from said optical centre by the presence of an opaque part belonging to the carrier vehicle.