| 摘要 |
<p>1. A viewer comprising at least one light source (5) of a predetermined dimension to be collimated, an optical collimation lens (6) and a partially reflecting holographic mirror (8) without optical power, for simultaneously viewing by transmission the outer landscape and by reflexion the collimated image of the light source, this simultaneous viewing being ensured for the eye of an observer located in a pupil zone (B1-B2) which defines the useful displacement amplitude of this eye at a predetermined observation distance (D) from the center (M) of the holographic mirror, characterized in that the holographic mirror (8) can be obtained by recording on a light sensitive plate (8.1, 8.2) made by means of a first light source (12) and a second light source (13), these sources being mutually coherent, punctiform, omnidirectional, symmetrically disposed with respect to said light sensitive plate and spaced apart from the center (M) of this light sensitive plate by a distance and in a direction which are respectively identical to the distance (D) and the direction (alpha n Bragg) valuable during the future use of the viewer for the respective positions of the holographic mirror (8) and of said pupil zone (B1-B2), said recording being thus obtained in any point of that light sensitive plate with different Bragg angles, such that the resulting holographic mirror (8) reflects in any of these points (R) the light radiation coming from the lens (6) along privileged directions (RB) oriented substantially towards the center (B) of said pupil zone (B1-B2).</p> |
