Image-erecting viewing optical system,申请号US20020307352-传众专利搜索

Image-erecting viewing optical system

申请公布号：US2003107801(A1)

申请号：US20020307352

申请日期：2002.12.02

申请公布日期：2003.06.12

申请人：

PENTAX CORPORATION

发明人：ISHII SHINICHIRO;NEMOTO SATORU

分类号：G02B23/06;G02B13/18;G02B17/04;G02B17/08;(IPC1-7):G02B23/00

主分类号：G02B23/06

摘要：An image-erecting viewing optical system includes a first prism having an incident surface and at least two reflection surfaces, a front lens group of an objective optical system, a second prism having an incident surface and at least two reflection surfaces, a-rear lens group of the objective optical system, a field stop, and an eyepiece optical system, in this order from the object. One reflection surface of the first or second prism includes a roof-mirror surface. The following conditions are satisfied: sin(theta-omega')>1/n (1) 6°<omega<16° (2) wherein theta designates an angle between the incident surface and the first reflection surface of the first prism; omega designates a real field-of-view omega (half amount); omega' designates an angle between a light ray of a real field-of-view omega (half amount) and the optical axis within the first prism; and n designates the refractive index of the first prism.