| 摘要 |
<P>PROBLEM TO BE SOLVED: To downsize a vibration-proof lens group and satisfactorily correct aberration in a single focus lens. <P>SOLUTION: As to a single focus lens, a focus distance of whole system is shorter than that of back focus. The single focus lens includes an aperture stop SP and a vibration-proof lens group Gis which reduces image blurring by moving in a direction including a direction component perpendicular to an optical axis. The single focus lens satisfies a condition of 0.1<f/¾fis¾<0.5, -0.35<Dis/DL<0.25. In the condition, f shows a focus distance of single focus lens, fis shows a focus distance of vibration-proof lens group, Dis shows a distance on the optical axis from the aperture stop to a farthest surface from the aperture stop among the vibration-proof lens group, and DL shows a distance on the optical axis from a first surface closest to an object side to an end surface closest to an image side in the single focus lens. As to each mark showing the distance on the optical axis, a direction from the object side to the image side is regarded as positive. <P>COPYRIGHT: (C)2012,JPO&INPIT |
