Endoscope objective lens

Details Endoscope objective lens Endoscope objective lens

2006-04-11

2006-04-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S784000

Reexamination Certificate

active

07027231

ABSTRACT:
An endoscope objective lens with a three-group, three lens element construction, is formed of, in order from the object side, a first lens element having either a negative meniscus shape or a plano-concave shape with its concave surface on the image side, a stop, a positive second lens element having a plano-convex shape with its convex surface on the image side, and a positive third lens element having a plano-convex shape with its convex surface on the object side. The stop is positioned on or in contact with the object-side surface of the second lens element so that the endoscope objective lens is substantially telecentric. Specified conditions are satisfied in order to reduce aberrations and make the manufacture of the endoscope objective lens easier and less expensive.

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patent: 09-068647 (1997-03-01), None
patent: 2003029142 (2003-01-01), None

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