Objective lens of endoscope

Details Objective lens of endoscope Objective lens of endoscope

1997-10-29

1998-10-27

Nelms, David C.

Optical: systems and elements

Lens

Microscope objective

359717, 359784, 359793, G02B 2102, G02B 302, G02B 904

Patent

active

058284982

ABSTRACT:
An objective lens for an endoscope includes a front lens of negative power, an aperture stop, and a rear lens group of positive power in this order from the object side. At least one surface of the front lens group and/or the rear lens group is a compound aspherical lens made of a glass lens and a transparent layer applied to the glass lens surface. A surface of the transparent layer farther from the glass lens is an aspherical surface. The refractive index n of the glass lens to which the transparent layer is applied is more than 1.65 (n>1.65).

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