Sapphire objective system

Details Sapphire objective system Sapphire objective system

1997-10-09

2000-03-14

Epps, Georgia

Optical: systems and elements

Lens

Microscope objective

359656, 359657, 359658, 359659, 359660, G02B 2102

Patent

active

060380799

ABSTRACT:
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.

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