专利检索 ap:("Ricoh Company, Ltd.") AND inv:"Nobuyuki ARAI" 第 1 页

1.

发明申请
PROJECTION OPTICAL SYSTEM INCLUDING MOVABLE LENS GROUPS AND IMAGE DISPLAY APPARATUS 审中-公开

公开(公告)号：US20190219801A1

公开(公告)日：2019-07-18

申请号：US16360983

申请日：2019-03-21

申请人： Ricoh Company, Ltd.

发明人： Yohei TAKANO , Hibiki TATSUNO , Nobuyuki ARAI , Hirotoshi NAKAYAMA

IPC分类号： G02B17/08 , G02B5/10 , G02B3/04 , G03B21/28 , G02B13/16

CPC分类号： G02B17/08 , G02B3/04 , G02B5/10 , G02B13/16 , G02B17/0852 , G02B17/0896 , G03B21/14 , G03B21/28

摘要： There is provided a projection optical system capable of projecting an image formed on an image forming unit on a projection plane, which has an extremely short projection distance and a small size.

2.

发明申请
PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS 审中-公开

公开(公告)号：US20180003934A1

公开(公告)日：2018-01-04

申请号：US15707565

申请日：2017-09-18

申请人： Ricoh Company, Ltd.

发明人： Yohei TAKANO , Hibiki TATSUNO , Nobuyuki ARAI , Hirotoshi NAKAYAMA

IPC分类号： G02B17/08 , G02B13/16 , G02B5/10 , G03B21/28 , G02B3/04 , G03B21/14

CPC分类号： G02B17/08 , G02B3/04 , G02B5/10 , G02B13/16 , G02B17/0852 , G02B17/0896 , G03B21/14 , G03B21/28

摘要： There is provided a projection optical system capable of projecting an image formed on an image forming unit on a projection plane, which has an extremely short projection distance and a small size.