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    • 43. 发明授权
    • Polarization element and optical device using polarization element
    • 偏振元件和使用偏振元件的光学元件
    • US07236655B2
    • 2007-06-26
    • US11433233
    • 2006-05-12
    • Kazuhiko MomokiKeiji Ohtaka
    • Kazuhiko MomokiKeiji Ohtaka
    • G02B6/00
    • G02B5/1809G02B5/3025
    • A high performance polarization splitting element and an optical device using the polarization splitting element are provided. According to an embodiment of the present invention, the optical device includes a first periodic structure having a period shorter than a wavelength of used light, a second periodic structure which has a period shorter than the wavelength of the used light and in which a direction of the period is orthogonal to or substantially orthogonal to that of the first periodic structure, and a pair of optical elements disposed so as to sandwich the first periodic structure and the second periodic structure. The second periodic structure is adjacent to the first periodic structure. The first periodic structure and the second periodic structure transmit light having first polarization direction and reflect light having second polarization direction orthogonal to the first direction, and the second polarization direction is substantially parallel to one of the periodic direction of the first periodic structure and the periodic direction of the second periodic structure.
    • 提供了高性能偏振分离元件和使用偏振分离元件的光学器件。 根据本发明的实施例,光学装置包括具有比所使用的光的波长短的周期的第一周期性结构,具有比所使用的光的波长短的周期的第二周期性结构,其中, 所述周期与所述第一周期性结构的周期正交或基本正交,并且所述一对光学元件被布置为夹着所述第一周期性结构和所述第二周期性结构。 第二周期性结构与第一周期结构相邻。 第一周期性结构和第二周期性结构透射具有第一偏振方向的光并且反射具有与第一方向正交的第二偏振方向的光,并且第二偏振方向基本上平行于第一周期性结构的周期方向之一, 方向的第二周期性结构。
    • 45. 发明授权
    • Projection image display apparatus
    • 投影图像显示装置
    • US06831706B2
    • 2004-12-14
    • US10197131
    • 2002-07-17
    • Masayuki AbeKeiji OhtakaAtsushi Okuyama
    • Masayuki AbeKeiji OhtakaAtsushi Okuyama
    • G02F11335
    • G02B27/1026G02B27/14G02B27/145G02B27/283H04N5/7441H04N9/3167
    • When light from a reflection image display element is incident on a polarization split surface at an angle other than 45°, leakage light that decreases the contrast of an image is produced. In a projection image display apparatus which illuminates an image display element with light from a light source and projects light from the image display element through two polarization split surfaces, when the angles of first and second light rays, of light rays incident on the polarization split surface, with respect to the optical axis correspond to 55% of the maximum angle of the incident light rays with respect to the optical axis, where light rays of which incident angle with respect to said image display element is larger is set as first light ray and light rays of which incident angle with respect to said image display element is smaller is set as second light ray, and a light shielding characteristic value L on the two polarization split surfaces is represented by L=[(M1)a·(M1)b+(M2)a·(M2)b]/2 where (M1)a is the amount of leakage light of the first light ray on the polarization split on the reflection image display element side, (M2)a is the amount of leakage light of the second light ray, (M1)b is the amount of leakage light of the first light ray on the polarization split on the projection optical system side, and (M2)b is the amount of leakage light of the second light ray.
    • 当来自反射图像显示元件的光以不同于45°的角度入射到偏振分割表面时,产生降低图像的对比度的泄漏光。 在利用来自光源的光照射图像显示元件的投影图像显示装置中,通过两个偏振分割面投影来自图像显示元件的光,当入射到偏振光分离体上的光线的第一和第二光线的角度 表面相对于光轴对应于入射光线相对于光轴的最大角度的55%,其中相对于所述图像显示元件的入射角较大的光线较大,被设定为第一光线 将相对于所述图像显示元件的入射角较小的光线设定为第二光线,并且将两个偏振分割面的遮光特性值L表示为L = [(M1)a(M1) b +(M2)a。(M2)b] / 2其中(M1)a是第一光线在反射图像显示元件侧的偏振分束上的泄漏光量,(M2)a是泄漏量 的光 (M1)b是投影光学系统侧的偏振光分割时的第一光线的泄漏光量,(M2)b是第二光线的漏光量。
    • 46. 发明授权
    • Focus detecting apparatus and optical apparatus using it
    • 聚焦检测装置和使用它的光学装置
    • US5729771A
    • 1998-03-17
    • US588420
    • 1996-01-18
    • Keiji Ohtaka
    • Keiji Ohtaka
    • G02B7/34G03B13/00G03B13/34
    • G02B7/346
    • The present invention relates to a focus detecting apparatus comprising a field mask disposed near a prescribed image plane of an objective lens and having an aperture offset from the optical axis of the objective lens in order to restrict a field area. A field lens is disposed near the prescribed image plane of the objective lens with a pair of secondary imaging lenses corresponding to the aperture for reimaging an image formed by the objective lens. A stop is disposed adjacent to the pair of secondary imaging lenses and having a pair of apertures for restricting light passing through the pair of secondary imaging lenses. A senor for detecting light quantity; distributions of images formed by the secondary imaging lenses. The pair of secondary imaging lenses are in contact with each other and have different projection shapes on a plane perpendicular to the optical axis of the objective lens.
    • 本发明涉及一种聚焦检测装置,其包括设置在物镜的预定像平面附近并具有从物镜的光轴偏移的孔径以便限制场区域的场屏蔽。 场透镜设置在物镜的规定像平面附近,具有与对应于由物镜形成的图像重新成像的孔的一对次级成像透镜。 停止件邻近该对次级成像透镜设置,并且具有用于限制穿过该对次级成像透镜的光的一对孔。 用于检测光量的传感器; 由二次成像透镜形成的图像的分布。 一对次级成像透镜彼此接触并且在垂直于物镜的光轴的平面上具有不同的投影形状。
    • 48. 发明申请
    • POLARIZATION BEAM SPLITTER AND OPTICAL SYSTEM USING THE SAME, AND IMAGE DISPLAYING APPARATUS, USING THE SAME
    • 使用其的偏振光束分离器和光学系统以及使用其的图像显示装置
    • US20070058251A1
    • 2007-03-15
    • US11531138
    • 2006-09-12
    • Kazuhiko MomokiKeiji Ohtaka
    • Kazuhiko MomokiKeiji Ohtaka
    • G02B5/30
    • G02B5/3025G02B27/283
    • In the conventional polarization beam splitter, it has been difficult to improve the angle-dependence characteristic of polarized beam splitting efficiency even if the number of layers is increased. In a conventional polarization beam splitter, it has been difficult to improve the angle-dependence characteristic of polarized beam splitting efficiency even if the number of layers is increased. The polarization beam splitter of the present invention is a polarization beam splitter having a polarized beam splitting layer having structure in which a plurality of gratings parallel to a first direction are periodically disposed in a second direction orthogonal to the first direction, and of light incident on the polarization beam splitter, chiefly light of a polarized component parallel to the first direction is transmitted therethrough, and chiefly light of a polarized component parallel to the second direction is reflected.
    • 在传统的偏振分束器中,即使层数增加,也难以改善偏振光束分离效率的角度依赖性。 在传统的偏振分束器中,即使层数增加,也难以改善偏振光束分离效率的角度依赖特性。 本发明的偏振分束器是具有偏振光束分离层的偏振光束分离器,其特征在于,与第一方向平行的多个光栅在与第一方向正交的第二方向上周期性地设置, 主要是偏振分束器,主要是平行于第一方向的偏振分量的光透过其中,并且主要反射与第二方向平行的偏振分量的光。
    • 49. 发明授权
    • Polarization element and optical device using polarization element
    • 偏振元件和使用偏振元件的光学元件
    • US07155073B2
    • 2006-12-26
    • US11122153
    • 2005-05-03
    • Kazuhiko MomokiKeiji Ohtaka
    • Kazuhiko MomokiKeiji Ohtaka
    • G02B6/00
    • G02B5/1809G02B5/3025
    • A high performance polarization splitting element and an optical device using the polarization splitting element are provided. According to an embodiment of the present invention, the optical device includes a first periodic structure having a period shorter than a wavelength of used light, a second periodic structure which has a period shorter than the wavelength of the used light and in which a direction of the period is orthogonal to or substantially orthogonal to that of the first periodic structure, and a pair of optical elements disposed so as to sandwich the first periodic structure and the second periodic structure. The second periodic structure is adjacent to the first periodic structure. The first periodic structure and the second periodic structure transmit light having first polarization direction and reflect light having second polarization direction orthogonal to the first direction.
    • 提供了高性能偏振分离元件和使用偏振分离元件的光学器件。 根据本发明的实施例,光学装置包括具有比所使用的光的波长短的周期的第一周期性结构,具有比所使用的光的波长短的周期的第二周期性结构,其中, 所述周期与所述第一周期性结构的周期正交或基本正交,并且所述一对光学元件被布置为夹着所述第一周期性结构和所述第二周期性结构。 第二周期性结构与第一周期结构相邻。 第一周期性结构和第二周期结构透射具有第一偏振方向的光并反射具有与第一方向正交的第二偏振方向的光。