Projection optical system and image display apparatus,申请号US20070742036-传众专利搜索

Projection optical system and image display apparatus

申请公布号：US7529032(B2)

申请号：US20070742036

申请日期：2007.04.30

申请公布日期：2009.05.05

申请人：

RICOH COMPANY, LTD.

发明人：TAKAURA ATSUSHI;ABE ISSEI;FUJITA KAZUHIRO

分类号：G02B9/00;G02B17/00;G03B21/28

主分类号：G02B9/00

摘要：A disclosed projection optical system for projecting and forming an enlarged image of an image displayed in a planar manner as an object includes: a lens system including, from an object side, at least a lens group providing telecentricity to an object space side, a lens group controlling divergence of angles of view, a diaphragm, a lens group converging the angles of view, and a lens group converging and subsequently enlarging the angles of view; and a catoptric system disposed on an image side relative to the lens system and including a mirror having negative power. Each lens group of the lens system and the mirror having negative power share an optical axis and the optical axis is shifted relative to a center of an object surface.