Endoscope objective lens with large entrance pupil diameter...

Details Endoscope objective lens with large entrance pupil diameter... Endoscope objective lens with large entrance pupil diameter...

2008-05-22

2010-10-26

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S659000, C359S660000, C600S101000

Reexamination Certificate

active

07821720

ABSTRACT:
An endoscope objective lens for collecting combined bright field (white light) and fluorescence images includes a negative lens group, a stop, and a positive lens group. The lens has a combination of large entrance pupil diameter (≧0.4 mm) for efficiently collecting weak fluorescence light, large ratio between the entrance pupil diameter and the maximum outside diameter (Dentrance/Dmaxlarger than 0.2), large field of view (FFOV≧120°) and favorably corrected spherical, lateral chromatic and Petzval field curvature for both visible and near infrared wavelengths.

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patent: 2008/0228037 (2008-09-01), Cline et al.

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