Patent ID: 7821720
Filing Date: 2010-10-26
Classification: G02B

Abstract:
1. An endoscope objective lens, comprising: a negative lens group, G a positive lens group, G a stop, S, placed between the negative lens group, G an optical filter, F, placed between the positive lens group, G a tunable filter, TF, for performing multi-spectral imaging or hyperspectral imaging, wherein all of the following conditions (1) to (4) are satisfied: and wherein, EFL is the effective focal length of the objective lens, F1 is the effective focal length of the negative lens group, G F2 is the effective focal length of the positive lens group, G F# is the f number of the objective lens, EPD is the entrance pupil diameter of the objective lens, Dia is the maximum diameter of the objective lens, and FFOV is the full field of view of the objective lens.