| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide techniques for an imaging lens with a wide visual field having satisfactorily corrected aberrations in the range of the visual field, and for an imaging optical system and a microscope using the same. <P>SOLUTION: An imaging lens 12 is used in combination with an infinity correction type objective lens for enlarging an image of an object. The imaging lens 12 comprises, in order from the objective lens side, a first lens group G1 including a cemented lens CL1 and having positive power, a second lens group G2 having negative power, and a third lens group G3 including a positive lens L5 and a negative lens L6 and having positive power as a whole. When FL is the focal length of the imaging lens 12, and D2 is a distance from a lens surface that is the closest to the objective lens in the imaging lens 12 to the exit pupil position of the objective lens, the imaging lens 12 satisfies the following conditional expression: 0.3<D2/FL<1.3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
