OPTICAL SYSTEM,申请号JP20060160623-传众专利搜索

OPTICAL SYSTEM

申请公布号：JP2007328232(A)

申请号：JP20060160623

申请日期：2006.06.09

申请公布日期：2007.12.20

申请人：

OLYMPUS CORP

发明人：KENNO KOKICHI;NAKAMURA SHIN

分类号：G02B17/08;G02B13/06;G02B13/18;G03B37/00;H04N5/225

主分类号：G02B17/08

摘要：PROBLEM TO BE SOLVED: To provide an optical system for taking an image having a full 360°-direction (all periphery) angle of view or projecting an image at a full 360°-direction (all periphery) angle of view, which is compact, restrains flare light to be little and is improved in resolving power. SOLUTION: The optical system is equipped with a front group 10 having two reflection surfaces 11 and 12 rotationally symmetric about a center axis 1, and a rear group 20 rotationally symmetric about the center axis and having positive power. The front group includes the first reflection surface 11 arranged on an opposite side to an entrance pupil 6Y and the second reflection surface 12 arranged on an opposite side to the first reflection surface 11, and the entrance pupil 6Y on a cross section including the center axis is arranged between the outer periphery of the first reflection surface 11 and the outer periphery of the second reflection surface 12. Luminous flux 2 made incident from a distant place passes through the front group 10 and the rear group 20 successively and forms an image at a position deviated from the center axis of an image surface 30. The entrance pupil 6Y is positioned separate from the center axis on the cross section including the center axis, and an entrance pupil 6X is positioned on the center axis on a plane orthogonal to a plane including the center axis and including the center light beam of the luminous flux. The rear group 20 is constituted of at least two groups. COPYRIGHT: (C)2008,JPO&INPIT