| 摘要 |
PROBLEM TO BE SOLVED: To provide a photographing lens which is small-sized and has excellent optical performance while securing its telecentric characteristics. SOLUTION: The objective lens comprises an opening diaphragm SP, a first lens L1 which has a convex face on the image side and has positive refractive force, a second lens L2 which has a concave face on the object side and has negative refractive force, and has positive refractive force as a whole. Therein, the image side lens surface of the first lens L1 which has a relatively strong refractive force and the object side lens surface of the second lens L2 have a concentric shape with respect to the center of the opening diaphragm SP. COPYRIGHT: (C)2005,JPO&NCIPI |
