公开(公告)号：US09915817B2

公开(公告)日：2018-03-13

申请号：US14916012

申请日：2014-10-29

申请人： Kent Periscope Ltd

发明人： Gary Owen

IPC分类号： G02B23/08 ,  G02B7/182 ,  G02B7/24 ,  F41H5/26

CPC分类号： G02B23/08 ,  F41H5/266 ,  G02B7/182 ,  G02B7/24

摘要： A periscope includes an object window 4, a first reflector 5, a second reflector 6; and an intermediate port between the first reflector 5 and the second reflector 6. The first reflector 5 is arranged to reflect light from the object window 4 towards the second reflector 6 through the intermediate port. The second reflector 6 is selectively movable between a first position of use in which the second reflector 6 reflects light from the first reflector 5 towards a viewing position and a second position of use in which the second reflector 6 closes the intermediate port.