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    Beam splitting for camera using a multilayer film
    1.
    发明授权
    Beam splitting for camera using a multilayer film 失效
    使用多层膜拍照的光束分裂

    公开(公告)号：US06661579B2

    公开(公告)日：2003-12-09

    申请号：US09772967

    申请日：2001-01-31

    申请人： Kiyoshi Araki ,  Taku Ito ,  Isao Okuda ,  Masahiro Oono ,  Moriyasu Kanai

    发明人： Kiyoshi Araki ,  Taku Ito ,  Isao Okuda ,  Masahiro Oono ,  Moriyasu Kanai

    IPC分类号： G02B2714

    CPC分类号： G02B27/144 ,  G02B23/14

    摘要： A beam splitter for a digital camera splits light passed through a photographing lens into beams directed to a CCD and a finder optical system. The beam splitter includes at least one optical element provided with a beam splitting surface that is inclined with respect to an optical axis of the photographing lens, and a multi-layer film including a plurality of layers of dielectric materials is formed on the beam splitting surface. The multi-layer film is configured such that the beam splitting surface exhibits a substantially constant reflectivity at least for visible light that is incident on the beam splitting surface at any incident angle within a predetermined range.

    摘要翻译： 用于数字照相机的分束器将通过拍摄镜头的光分解成指向CCD和取景器光学系统的光束。 分束器包括至少一个光学元件，其设置有相对于拍摄镜头的光轴倾斜的分束表面，并且在分束表面上形成包括多层电介质材料的多层膜 。 多层膜被配置为使得分束表面至少对于在预定范围内以任何入射角入射在分束表面上的可见光呈现基本恒定的反射率。

    Optical multilayer thin film and beam splitter
    2.
    发明授权
    Optical multilayer thin film and beam splitter 失效
    光学多层薄膜和分束器

    公开(公告)号：US5579159A

    公开(公告)日：1996-11-26

    申请号：US355200

    申请日：1994-12-08

    申请人： Taku Ito

    发明人： Taku Ito

    IPC分类号： G02B1/10 ,  G02B27/14 ,  G02B27/28 ,  G02B5/30

    CPC分类号： G02B5/0825 ,  G02B27/1073 ,  G02B27/142 ,  G02B27/283 ,  G02B5/26 ,  G02B5/3041

    摘要： A beam splitter having an optical multilayer thin film is disclosed. The optical multilayer thin film is formed by laminating six layers in sequence. The laminated six layers comprise: a first layer, a third layer and a fifth layer each having a refractive index from 1.63 to 1.64; a second layer and a sixth layer each having a refractive index from 1.37 to 1.38, a fourth layer having a refractive index from 1.9 to 2.3; in which light is allowed to be incident upon the first layer of the optical multilayer thin film at the angle of incidence equal to or greater than 40.degree.. The reflectances of S and P polarized components of reflected light are substantially equal to each other over a wide wavelength range and substantially no phase difference exists between the S and P polarized components. The beam splitter having a multilayer polarizing light separating film formed between an incoming side prism and an outgoing side prism is extremely high in the reflectance of the P polarized component of reflected light, in comparison with that of the S polarized component of the same reflected light.

    摘要翻译： 公开了一种具有光学多层薄膜的分束器。 光学多层薄膜依次层叠6层。 层压六层包括：折射率为1.63-1.64的第一层，第三层和第五层; 第二层和第六层，每层具有1.37至1.38的折射率，第四层的折射率为1.9至2.3; 其中允许光以入射角等于或大于40°入射到光学多层薄膜的第一层上。 反射光的S和P偏振分量的反射率在宽波长范围内基本上彼此相等，并且在S和P偏振分量之间基本上没有相位差。 与入射侧棱镜和出射侧棱镜之间形成的多层偏振光分离膜的分束器相比，反射光的P偏振分量的反射率相对于相同反射光的S偏振分量的反射率非常高 。

    Optical multilayer thin film and beam splitter
    3.
    发明授权
    Optical multilayer thin film and beam splitter 失效
    光学多层薄膜和分束器

    公开(公告)号：US5400179A

    公开(公告)日：1995-03-21

    申请号：US18383

    申请日：1993-02-17

    申请人： Taku Ito

    发明人： Taku Ito

    IPC分类号： G02B1/10 ,  G02B27/14 ,  G02B27/28 ,  G02B5/20

    CPC分类号： G02B5/0825 ,  G02B27/1073 ,  G02B27/142 ,  G02B27/283 ,  G02B5/26 ,  G02B5/3041

    摘要： An optical multilayer thin film and a beam splitter having an optical multilayer thin film are disclosed. The optical multilayer thin film is formed by laminating six layers in sequence. The laminated six layers comprise: a first layer, a third layer and a fifth layer each having a refractive index between 1.63 and 1.64; a second layer and a sixth layer each having a refractive index between 1.37 and 1.38, a fourth layer having a refractive index between 1.9 and 2.3; in which light is allowed to be incident upon the first layer of the optical multilayer thin film at the angle of incidence equal to or greater than 40.degree.. In the beam splitter, the reflectances of S and P polarized components of reflected light are substantially equal to each other over a wide wavelength range and substantially no phase difference exists between the S and P polarized components. Further a beam splitter having a multilayer polarizing light separating film formed between an incoming side prism and an outgoing side prism is also disclosed, which is extremely high in the reflectance of the P polarized component of reflected light, in comparison with that of the S polarized component of the same reflected light.

    摘要翻译： 公开了具有光学多层薄膜的光学多层薄膜和分束器。 光学多层薄膜依次层叠6层。 层压六层包括：折射率在1.63和1.64之间的第一层，第三层和第五层; 折射率在1.37和1.38之间的第二层和第六层，第四层的折射率在1.9和2.3之间; 其中允许光以入射角等于或大于40°入射到光学多层薄膜的第一层上。 在分光器中，反射光的S偏振分量和P偏振分量的反射率在宽波长范围内基本上彼此相等，并且在S和P偏振分量之间基本上不存在相位差。 此外，还公开了一种在入射侧棱镜和出射侧棱镜之间形成的多层偏振光分离膜的分束器，其与反射光的P偏振分量的反射率相比非常高，与S偏振 相同反射光的分量。

    Optical filter element and wavelength division multiplexing optical coupler
    5.
    发明申请
    Optical filter element and wavelength division multiplexing optical coupler 失效
    光滤波元件和波分复用光耦合器

    公开(公告)号：US20060159390A1

    公开(公告)日：2006-07-20

    申请号：US11334756

    申请日：2006-01-17

    申请人： Taku Ito

    发明人： Taku Ito

    IPC分类号： G02B6/26

    CPC分类号： G02B6/2937 ,  G02B6/2938

    摘要： An optical filter element having high isolation and reduction in reflection loss for input light beams. The optical filter element is used with a transparent substrate having a surface that includes a first area and a second area. The optical filter element has a target wavelength range. The optical filter element includes a first dielectric multilayer film arranged in the first area of the transparent substrate. A second dielectric multilayer film is arranged in the second area of the surface of the transparent substrate. The second dielectric multilayer film has a reflectance of a predetermined value or less for a light beam having a wavelength in the target wavelength range. A portion of the second dielectric multilayer film and a portion of the first dielectric multilayer film are laminated each other.

    摘要翻译： 一种对输入光束具有高隔离度和降低反射损耗的滤光元件。 光学滤光元件与具有包括第一区域和第二区域的表面的透明基板一起使用。 滤光元件具有目标波长范围。 滤光器元件包括布置在透明基板的第一区域中的第一电介质多层膜。 第二电介质多层膜布置在透明基板的表面的第二区域中。 对于具有目标波长范围的波长的光束，第二电介质多层膜对于具有预定值或更小的反射率。 第二电介质多层膜的一部分和第一电介质多层膜的一部分层叠。

    Viewing optical instrument having roof prism and a roof prism
    10.
    发明授权
    Viewing optical instrument having roof prism and a roof prism 失效
    观察具有屋顶棱镜和屋脊棱镜的光学仪器

    公开(公告)号：US06304395B1

    公开(公告)日：2001-10-16

    申请号：US09264000

    申请日：1999-03-08

    申请人： Taku Ito ,  Masato Noguchi

    发明人： Taku Ito ,  Masato Noguchi

    IPC分类号： G02B504

    CPC分类号： G02B5/04

    摘要： A viewing optical instrument has a roof prism which is provided with a pair of reflection surfaces intersecting at a nominal face angle of 90°, wherein the pupil is split by an edge line of the reflection surfaces of the roof prism. The reflection surfaces are provided with a multiple-layer coating which does not absorb visible light. A change in the phase difference produced between light incident on one of reflection surfaces located on opposite sides of an edge line of the roof prism and emitted from the other reflection surface, and light incident on the right reflection surface and emitted from the left reflection surface is restricted to reduce wavefront aberrations to thereby improve the quality of an image to be viewed. A roof prism used in the optical instrument is also disclosed.

    摘要翻译： 观察光学仪器具有屋顶棱镜，其具有以标称面角90°相交的一对反射面，其中，瞳孔被顶板棱镜的反射面的边缘线分开。 反射面设置有不吸收可见光的多层涂层。 在入射到顶板棱镜的边缘线的相反侧并且从另一反射面发射的反射面之一上的光之间产生的相位差的变化以及从左反射面发射的入射光 被限制以减少波前像差，从而提高要观看的图像的质量。 还公开了在光学仪器中使用的屋顶棱镜。