Patent ID: 11892355
Assignee: CENTRE SCIENTIFIQUE ET TECHNIQUE DU BÂTIMENT (CSTB)
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An optical device, intended to be arranged on a detector equipped with an infrared sensor in order to increase an angle of the field of view of the detector, comprising:
a primary mirror of circular overall shape, comprising a circular opening at its center,
a secondary mirror of circular overall shape and of diameter smaller than the diameter of the primary mirror, comprising a circular opening at its center,
at least one connecting means for connecting the primary mirror and the secondary mirror, so as to arrange a reflective surface of the primary mirror facing a reflective surface of the secondary mirror,
the primary and secondary mirrors being designed to reflect radiation in the infrared; and
the primary mirror and the secondary mirror being configured to form an afocal system and to form a continuous very wide-angle image with the center of the image obtained by the central circular openings, the angle (α) of the field of view of the device being greater than 90°.