Optical system,申请号US20100924543-传众专利搜索

Optical system

申请公布号：US8331039(B2)

申请号：US20100924543

申请日期：2010.09.28

申请公布日期：2012.12.11

申请人：

MIZUSAWA MASAYUKI;OLYMPUS CORPORATION

发明人：MIZUSAWA MASAYUKI

分类号：G02B17/00;G02B15/14

主分类号：G02B17/00

摘要：An optical system for observing front and lateral objects includes a negative front group having a reflective refractive element, an aperture stop, and a positive rear group having a moving lens unit that is movable along the optical axis. The reflective refractive element includes a front-object-side first face having a transmitting surface and a reflective surface annularly formed around the transmitting surface, an image-side second face having a transmitting surface and a reflective surface annularly formed around the transmitting surface, and a face formed as a transmitting surface between the first and second faces. The optical system performs focusing onto an object while hardly changing, in the entire observation area, an area in which an image of the front object is formed, by moving the moving lens unit to the extent that the refractive powers of the front and rear groups hardly change relative to each other.