| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily suppress a change in an angle of view and a change in curvature of field due to a manufacture error and an assembling error, while having small size and a wide viewing angle.SOLUTION: The objective lens for the endoscope includes a front lens group having negative power and a rear lens group having positive power arranged such that an aperture stop is positioned therebetween, wherein the front lens group comprises at least a front-side negative lens and a front-side positive lens arranged in this order from an object side, and the rear lens group comprises at least a rear-side positive lens and a cemented lens arranged in this order from the object side, the cemented lens being configured by cementing together negative and positive lenses. |
