Sapphire objective system

Details Sapphire objective system Sapphire objective system

G - Physics

02

B

G02B 1/02 (2006.01) A61B 1/00 (2006.01) G02B 13/00 (2006.01) G02B 23/24 (2006.01)

Patent

CA 2304559

Objective lenses for endoscopes are made substantially of sapphire. The high refractive index of sapphire results in optical components with shallower curvatures, leading to smaller geometric aberrations, and consequently fewer components are required to correct for these aberrations, Chromatic aberrations are less severe because of sapphire's low dispersion. The objectives may be either of the landscape or retrofocus type, and are compact with moderate field of view, low f-number, and less distortion than most conventional designs.

L'invention concerne des lentilles d'objectif d'endoscopes réalisées essentiellement en saphir. L'indice élevé de réfraction du saphir permet d'obtenir des composants optiques présentant des courbures moins profondes, et donc d'avoir des aberrations géométriques plus petites. En conséquence, on a besoin de moins de composants pour corriger ces aberrations. Les aberrations chromatiques sont moins importantes étant donné la faible dispersion du saphir. Ces objectifs peuvent être soit du type paysage ou rétro-focus, ils sont compacts et présentent un champ de vision moyen, un nombre d'ouverture f faible, ainsi que moins de distorsion que des objectifs de conception plus classique.

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