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21. 发明授权

US06084714A Polarizing illumination device and projection display device 有权
标题翻译：偏光照明装置和投影显示装置
公开(公告)号：US06084714A
公开(公告)日：2000-07-04
申请号：US236467
申请日：1999-01-25
申请人： Tomiyoshi Ushiyama , Akitaka Yajima
发明人： Tomiyoshi Ushiyama , Akitaka Yajima
IPC分类号： G02B5/30 , G02B27/28 , G02F1/13 , G03B21/00 , G03B33/12 , G02B27/10
CPC分类号： G02B27/285 , G02B27/283
摘要： A technique for preventing a decrease in the amount of effective polarized light that emerges from a polarizing conversion element array is provided. To this end, a polarizing illumination device includes a polarizing conversion element array that converts light emitted from a light source into one type of linearly polarized light, and a plurality of light-shielding portions for blocking a part of light that is incident on the polarizing conversion element array. The polarizing conversion element array is divided into effective incident areas for emitting effective polarized light, and ineffective incident areas for emitting ineffective polarized light. The widths of the plurality of light-shielding portions are set to be smaller than the width of the ineffective incident areas of the polarizing conversion element array, so that light to be incident on the effective incident areas is not blocked. This makes it possible to prevent a decrease in the amount of effective polarized light that emerges from the polarizing conversion element array.
摘要翻译：提供了一种用于防止偏振转换元件阵列产生的有效偏振光量减少的技术。为此，偏振照明装置包括将从光源发射的光转换为一种线偏振光的偏光转换元件阵列和用于阻挡入射到偏振光的部分光的多个遮光部转换元素数组。偏振转换元件阵列被分成用于发射有效偏振光的有效入射区域和用于发射无效偏振光的无效入射区域。将多个遮光部的宽度设定为小于偏振变换元件阵列的无效入射面积的宽度，使得入射到有效入射区域的光不被阻挡。这使得可以防止从极化转换元件阵列出现的有效偏振光的量的减少。

22. 发明授权

US5978136A Optical element, polarization illumination device, and projection display apparatus 失效
标题翻译：光学元件，偏振照明装置和投影显示装置
公开(公告)号：US5978136A
公开(公告)日：1999-11-02
申请号：US992012
申请日：1997-12-17
申请人： Yasunori Ogawa , Akitaka Yajima , Tomiyoshi Ushiyama
发明人： Yasunori Ogawa , Akitaka Yajima , Tomiyoshi Ushiyama
IPC分类号： G02B5/30 , G02B27/28 , G02F1/13 , G02F1/1335 , G02F1/13357 , G03B21/00 , H04N9/31
CPC分类号： G02B27/285 , G02B27/283 , H04N9/3105 , H04N9/3167
摘要： Two polarization conversion element arrays are disclosed. Each polarization conversion element array is composed of a plurality of polarization conversion elements for converting light incident upon the polarization conversion element array to a linearly polarized light beam with a predetermined polarization direction. The plurality of polarization conversion elements are disposed opposite to each other with a predetermined space provided between at about the center of the light-outgoing surface of a lens array in the direction of arrangement. Of the light beams (s-polarized+p-polarized light beams) gathered by the lens array, light beam that is not incident upon the polarization conversion element and passes through the predetermined space is a light beam including a predetermined polarized light beam (s-polarized light beam) that is primarily made to leave the array 320a and an ineffective polarized light beam (p-polarized light beam). Of the light passing through and leaving the space, the required polarized light beam alone can be made to leave as an effective light beam by providing a polarization plate or the like at the light-outgoing side of the space.
摘要翻译：公开了两个偏振转换元件阵列。每个偏振转换元件阵列由多个偏振转换元件组成，用于将入射到偏振转换元件阵列上的光转换成具有预定偏振方向的线偏振光束。多个偏振转换元件以设置在透镜阵列的光出射表面的中心附近的布置方向彼此相对地设置有预定的空间。在由透镜阵列收集的光束（s偏振+ p偏振光束）中，未入射到偏振转换元件并通过预定空间的光束是包括预定偏振光束（s 偏振光束），其主要是离开阵列320a和无效偏振光束（p偏振光束）。在通过和离开空间的光中，通过在空间的光出射侧提供偏振板等，可以使所需的偏振光束单独地留下作为有效的光束。

23. 发明授权

US5743610A Projection-type display apparatus 失效
标题翻译：投影型显示装置
公开(公告)号：US5743610A
公开(公告)日：1998-04-28
申请号：US697707
申请日：1996-08-27
申请人： Akitaka Yajima , Motoyuki Fujimori , Mutsuya Furuhata , Tomiyoshi Ushiyama , Terunaga Koide , Toshiaki Hashizume , Kiyoshi Miyashita , Hiroshi Harima , Keijiro Naito
发明人： Akitaka Yajima , Motoyuki Fujimori , Mutsuya Furuhata , Tomiyoshi Ushiyama , Terunaga Koide , Toshiaki Hashizume , Kiyoshi Miyashita , Hiroshi Harima , Keijiro Naito
IPC分类号： G02B27/14 , G03B21/14 , H04N5/74 , H04N9/31
CPC分类号： G03B33/12 , G02B27/1046 , G02B27/1073 , G02B27/145 , G02B27/149 , H04N9/3105 , H04N9/312 , H04N9/3141 , H04N9/3144 , H04N9/317 , H04N9/3182
摘要： A projection display comprising: a square column dichroic prism composed of four triangle prisms having equal refractive index together whose cross sections are right isosceles triangles such that three light valves are located adjacent to three exterior peripheral surfaces of dichroic prism to receive colored and modulated light beams therefrom and; a filter for absorbing light with a specified wavelength range, leaked from surface of dichroic prism at the opposite side of incident light surface and directed to liquid crystal light valve, the filter being located between liquid crystal light valves and surface of dichroic prism. As for construction of the dichroic prism itself, specifically, of the four aforementioned triangular prisms, the first triangular prism and the aforementioned third triangular prism are mutually affixed in a condition in which there is a first step difference in the vertical direction. The first exposed side is formed on one edge of the affixed side of the first triangular prism. Similarly, the second triangular prism and the fourth triangular prism are attached to each other such that there is a second step difference on the same edge, and a second exposed side is formed on one edge of the affixed surface of the second triangular prism. Further, the first and the third triangular prisms and the second and the fourth triangular prisms are attached, with a step difference between them, in such a way that the aforementioned first exposed side and the aforementioned second exposed side are located on the edges facing the same direction; and a third exposed surface that is orthogonal to the aforementioned first and second exposed surfaces is formed between the aforementioned first triangular prism and the aforementioned second triangular prism.
摘要翻译：一种投影显示器，包括：方柱列分色棱镜，其由具有相等折射率的四个三角棱镜组成，其横截面为右等腰三角形，使得三个光阀位于与分色棱镜的三个外周表面相邻以接收有色调制光束和用于吸收具有特定波长范围的光的滤光器，从入射光面的相对侧的二向色棱镜的表面泄漏并且指向液晶光阀，该滤光器位于液晶光阀和二向色棱镜表面之间。关于二向色棱镜本身的结构，具体地，在上述四个上述三角棱镜中，第一三角形棱镜和上述第三三棱镜在垂直方向上具有第一阶差的状态下相互固定。第一暴露侧形成在第一三角形棱镜的固定侧的一个边缘上。类似地，第二三角棱镜和第四三角棱镜彼此附接，使得在同一边缘上存在第二阶梯差，并且第二暴露侧形成在第二三角棱镜的固定表面的一个边缘上。此外，第一和第三三角形棱镜和第二和第四三角棱镜以它们之间的台阶差附接，使得上述第一暴露侧和上述第二暴露侧位于面向同方向并且在上述第一三角棱镜和上述第二三棱镜之间形成有与上述第一和第二暴露表面正交的第三暴露表面。

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