Patent Number: 7,821,720

Title: Endoscope objective lens with large entrance pupil diameter and high numerical aperture

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 (.gtoreq.0.4 mm) for efficiently collecting weak fluorescence light, large ratio between the entrance pupil diameter and the maximum outside diameter (D.sub.entrance/D.sub.max larger than 0.2), large field of view (FFOV.gtoreq.120.degree.) and favorably corrected spherical, lateral chromatic and Petzval field curvature for both visible and near infrared wavelengths.

Inventors: Wang; Xinghua (Clifton Park, NY), Yazdanfar; Siavash (Niskayuna, NY)

Assignee: General Electric Company

International Classification: G02B 21/02 (20060101); A61B 1/00 (20060101)

Expiration Date: 2018-10-26 0:00:00