发明授权
- 专利标题: Projection lens and image display device
- 专利标题(中): 投影镜头和图像显示装置
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申请号: US340141申请日: 1999-06-28
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公开(公告)号: US6130786A公开(公告)日: 2000-10-10
- 发明人: Atsuo Osawa , Hiroki Yoshikawa , Shigeru Mori , Naoyuki Ogura
- 申请人: Atsuo Osawa , Hiroki Yoshikawa , Shigeru Mori , Naoyuki Ogura
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-122960 19930525; JPX5-253899 19931012
- 主分类号: G02B9/60
- IPC分类号: G02B9/60 ; G02B13/18 ; G02B13/24 ; G02B3/00
摘要:
An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens group and a fifth aspherical lens group which are arranged in this order successively from a screen side, the third lens group having refractive power of not lower than 70% of the total power of the projection lens system, the respective peripheral shapes of the first and second aspherical lens groups being set to have a predetermined relation, a low-dispersion high-index glass material being used for a convex lens of a green projection lens system, a high-dispersion high-index glass material being used for convex lenses of blue and red projection lens systems.
公开/授权文献
- US5609496A Air-tight connector assembly 公开/授权日:1997-03-11