| 摘要 |
<p>The invention concerns an optical device for a system presenting collimated images comprising a spherical mirror (1) used off axis. The invention enables to present to the user (3) an image whereof the distortion caused by the spherical mirror (1) has been corrected. For this purpose the device comprises an additional aspheric mirror (21) the surface of which forms in of the unfolded optics reflection plane (P) a curve (26) whereof the radius of curvature is variable. The surface ensures a correction of the eye pupil image given by the spherical mirror (1): the pupil image is rectified on the optical axis. The surface can be a paraboloid, an ellipsoid and can have a rotational symmetry. The invention is particularly applicable to helmet visors for aircraft pilot.</p> |
