Patent ID: 7379252

Claim:
A fixed focal length endoscope objective lens system comprising a negative front lens group, a diaphragm, and a positive rear lens group, in this order from an object; wherein said negative front lens group comprises one lens element, or a plurality of non-cemented lens elements; wherein the most object-side lens element of said negative front lens group is a negative lens element; wherein said positive rear lens group comprises a plurality of non-cemented lens elements; wherein at least one negative lens element is provided in said positive rear lens group; wherein said endoscope objective lens system satisfies the following conditions: −1.45 <f 1 /f <−0.6 0.7 <|f F /f R |<1.35 −2.3 <f (−) /f <−1.5 wherein f 1 designates the focal length of the most object-side negative lens element of said negative front lens group; f designates the focal length of the entire endoscope objective lens system; f F designates the focal length of said negative front lens group with (f F <0); f R designates the focal length of said positive rear lens group with (f R >0); and f (−) designates the focal length of said negative lens element of said positive rear lens group.