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1. 发明授权

US07404646B2 Projection lens apparatus and rear projection type image display apparatus 失效
标题翻译：投影透镜装置和背投型图像显示装置
公开(公告)号：US07404646B2
公开(公告)日：2008-07-29
申请号：US11060251
申请日：2005-02-18
申请人： Yuriko Inadachi , Shuji Kato , Hidehiro Ikeda , Naoyuki Ogura , Koji Hirata
发明人： Yuriko Inadachi , Shuji Kato , Hidehiro Ikeda , Naoyuki Ogura , Koji Hirata
IPC分类号： G03B21/20 , G03B9/00
CPC分类号： G02B13/16 , G02B13/18 , G03B21/10 , G03B21/20
摘要： A projection lens apparatus includes a plurality of lenses, for enlarging and projecting, onto a screen, an original image displayed on an image generation source. The plurality of lenses are arranged, beginning with the lens nearest the screen, as first to sixth lens groups. The fourth lens group includes one meniscus lens that has a positive refracting power and has a concave lens surface directed toward the screen. The concave lens surface of the meniscus lens included in the fourth group lens has a curvature in the vicinity of an outer portion of the concave lens surface that is smaller than a curvature in a predetermined area of the concave lens surface defined between a light axis of the concave lens surface of the meniscus lens and the smaller curvature of the concave lens surface in the vicinity of the outer portion of the concave lens surface.
摘要翻译：投影透镜装置包括多个透镜，用于将显示在图像产生源上的原始图像放大并投影到屏幕上。多个透镜从最靠近屏幕的透镜开始设置为第一至第六透镜组。第四透镜组包括具有正折射率的一个弯月形透镜，并且具有指向屏幕的凹透镜表面。包括在第四组透镜中的凹凸透镜的凹透镜表面在凹透镜表面的外部附近具有小于在凹透镜表面的预定区域中的曲率的曲率，所述凹透镜表面的光轴凹透镜的凹透镜表面和凹透镜表面在凹透镜表面的外部附近的较小曲率。

2. 发明申请

US20050259228A1 Projection lens apparatus and rear projection type image display apparatus 失效
标题翻译：投影透镜装置和背投型图像显示装置
公开(公告)号：US20050259228A1
公开(公告)日：2005-11-24
申请号：US11060251
申请日：2005-02-18
申请人： Yuriko Inadachi , Shuji Kato , Hidehiro Ikeda , Naoyuki Ogura , Koji Hirata
发明人： Yuriko Inadachi , Shuji Kato , Hidehiro Ikeda , Naoyuki Ogura , Koji Hirata
IPC分类号： G02B13/16 , G02B13/18 , G03B21/00 , G03B21/10 , G03B21/20 , G03B21/22
CPC分类号： G02B13/16 , G02B13/18 , G03B21/10 , G03B21/20
摘要： For a projection lens apparatus having a six-group structure that enlarges and projects an image displayed on a projection tube, an appropriate distance is maintained between a power lens and an aspherical lens group that is located near a power lens on the image generation source side, and physical interference with the power lens is eliminated, so that productivity is increased while a cost reduction is achieved. A meniscus lens that has a concave face directed toward a screen and has a refracting power is employed as an aberration correction lens (fourth group lens 4) that is located near the power lens (third group lens 3) on the image generation source side. Further, the lens surface of the meniscus lens on the screen side has an aspherical shape, so that a curvature is increased from the light axis to a predetermined point located between the light axis and the outer edge, and is reduced from the predetermined point to the outer edge. Furthermore, an inexpensive low refractive index material that has an Abbe number (νd) of 57 or higher and a refractive index (nd) of 1.500 or lower and that has superior flowability is employed as the base material for the fourth group lens that is located nearest the glass power lens on the image generation source side.
摘要翻译：对于具有六组结构的投影透镜装置，其放大并投影显示在投影管上的图像，在功率透镜和位于图像生成源侧的功率透镜附近的非球面透镜组之间保持适当的距离并且消除了与功率透镜的物理干扰，从而在实现成本降低的同时提高了生产率。使用具有朝向屏幕的凹面并具有折射光焦度的弯月形透镜作为位于图像产生源侧的功率透镜（第三组透镜3）附近的像差校正透镜（第四组透镜4）。此外，屏幕侧的弯月透镜的透镜表面具有非球面形状，使得曲率从光轴增加到位于光轴和外边缘之间的预定点，并且从预定点减小到外边缘。此外，使用阿贝数（nud）为57以上且折射率（nd）为1.500以下且具有优异的流动性的便宜的低折射率材料作为位于第四组透镜的基材最靠近图像生成源侧的玻璃功率透镜。

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