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    DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL SYSTEM INCLUDING THE SAME
    2.
    发明申请
    DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL SYSTEM INCLUDING THE SAME 有权
    衍射光学元件和光学系统，包括它们

    公开(公告)号：US20080043335A1

    公开(公告)日：2008-02-21

    申请号：US11874046

    申请日：2007-10-17

    申请人： Takehiko Nakai

    发明人： Takehiko Nakai

    IPC分类号： G02B5/18

    CPC分类号： G02B5/1895 ,  G02B5/1814 ,  G02B5/1866 ,  G02B27/0037 ,  G02B27/42 ,  G02B27/4211 ,  G02B27/4277

    摘要： A diffractive optical element includes a plurality of diffraction gratings. A diffraction grating within the plurality of diffraction gratings includes a plurality of grating parts having a curved grating surface and grating tips which connect to define a curved envelope face. The grating surface has a radius of curvature larger than a radius of curvature of the envelope face. In addition, two diffraction gratings within the plurality of diffraction gratings are composed of different materials having different dispersions. Therefore, even when the radius of curvature of the envelope face is small, the degradation of the diffraction efficiency is suppressed.

    摘要翻译： 衍射光学元件包括多个衍射光栅。 多个衍射光栅内的衍射光栅包括具有弯曲光栅表面的多个光栅部分和连接以限定弯曲包络面的光栅尖端。 光栅表面的曲率半径大于信封面的曲率半径。 此外，多个衍射光栅内的两个衍射光栅由具有不同分散度的不同材料组成。 因此，即使包络面的曲率半径小，也能够抑制衍射效率的劣化。

    Image reading apparatus
    5.
    发明授权
    Image reading apparatus 失效
    图像读取装置

    公开(公告)号：US5362957A

    公开(公告)日：1994-11-08

    申请号：US64875

    申请日：1993-05-24

    申请人： Takehiko Nakai ,  Michitaka Setani

    发明人： Takehiko Nakai ,  Michitaka Setani

    IPC分类号： G02B5/18 ,  G02B5/20 ,  G02B27/00 ,  G02B27/10 ,  G02B27/42 ,  H04N1/028 ,  H04N1/04 ,  H04N1/48 ,  H01J40/14

    CPC分类号： G02B27/1013 ,  G02B27/1086 ,  G02B5/1861 ,  G02B5/1871 ,  G02B5/203 ,  H04N1/488

    摘要： An image reading apparatus is provided with a light-receiving device, an imaging optical system and a blazed diffraction grating. In the light-receiving device, a plurality of line sensors are arranged on the same substrate. An image of an object to be imaged is formed on the light-receiving device by the imaging optical system. The blazed diffraction grating is arranged in an optical path between the imaging optical system and the light-receiving device. The blazed diffraction grating color-separates a light beam from the object to be imaged into a plurality of light components. The diffraction grating is so constructed to have grating lines with at least two different grating heights.

    摘要翻译： 图像读取装置设置有光接收装置，成像光学系统和闪耀的衍射光栅。 在光接收装置中，多个线传感器布置在同一基板上。 成像光学系统在光接收装置上形成要被成像的物体的图像。 闪耀的衍射光栅布置在成像光学系统和光接收装置之间的光路中。 闪耀的衍射光栅将要被成像的物体的光束分色成多个光分量。 衍射光栅被构造成具有至少两个不同光栅高度的光栅线。

    OPTICAL ELEMENT HAVING PERIODIC STRUCTURE AND OPTICAL APPARATUS USING THE SAME
    6.
    发明申请
    OPTICAL ELEMENT HAVING PERIODIC STRUCTURE AND OPTICAL APPARATUS USING THE SAME 失效
    具有周期性结构的光学元件和使用其的光学装置

    公开(公告)号：US20080130110A1

    公开(公告)日：2008-06-05

    申请号：US11950827

    申请日：2007-12-05

    申请人： Takehiko Nakai

    发明人： Takehiko Nakai

    IPC分类号： G02B5/30

    CPC分类号： G02B1/118 ,  G02B5/1809 ,  G02B5/3083 ,  G02F2201/38

    摘要： An optical element includes a first periodic structure portion being formed on a base portion and having a one-dimensional periodic structure in which a first medium and a second medium with a smaller refractive index than that of the first medium are alternately disposed in a first direction, and a second periodic structure portion being formed on the first periodic structure portion and having a periodic structure in which a third medium and a fourth medium with a smaller refractive index than that of the third medium are alternately disposed in the first direction. At an interface between the first and second periodic structure portions, a ratio of the first medium in the first periodic structure portion and a ratio of the third medium in the second periodic structure portion are different from each other. The element has a good form birefringence effect and a high reflection-suppressing effect.

    摘要翻译： 光学元件包括第一周期结构部分，其形成在基部上并且具有一维周期性结构，其中具有比第一介质的折射率小的折射率的第一介质和第二介质在第一方向上交替地设置 并且第二周期性结构部分形成在第一周期性结构部分上并且具有周期性结构，其中折射率小于第三介质的第三介质和第四介质在第一方向上交替设置。 在第一和第二周期性结构部分之间的界面处，第一周期性结构部分中的第一介质与第二周期性结构部分中的第三介质的比例彼此不同。 该元件具有良好的形状双折射效应和高反射抑制效果。

    Diffractive optical element, and optical system and optical apparatus provided with the same
    7.
    发明授权
    Diffractive optical element, and optical system and optical apparatus provided with the same 失效
    衍射光学元件，以及具有该衍射光学元件的光学系统和光学装置

    公开(公告)号：US06927915B2

    公开(公告)日：2005-08-09

    申请号：US10459902

    申请日：2003-06-12

    申请人： Takehiko Nakai

    发明人： Takehiko Nakai

    IPC分类号： G02B5/18

    CPC分类号： G02B5/1876

    摘要： A diffractive optical element of the blazed-binary grating type is disclosed, with which a high diffraction efficiency can be achieved over substantially the entire used wavelength region. The diffractive optical element has a periodic structure taking a grating unit including a plurality of grating portions with different grating width and grating interval as one period. The diffraction element further includes a plurality of first grating portions made of a first material and a plurality of second grating portions made of a second material having a different refractive index than the first material that are arranged between the first grating portion.

    摘要翻译： 公开了闪耀二进制光栅类型的衍射光学元件，可以在基本上整个使用的波长区域上实现高衍射效率。 衍射光学元件具有采用光栅单元的周期性结构，该光栅单元包括具有不同光栅宽度和光栅间隔的多个光栅部分作为一个周期。 衍射元件还包括由第一材料制成的多个第一光栅部分和由布置在第一光栅部分之间的具有与第一材料不同的折射率的第二材料制成的多个第二光栅部分。

    Diffractive optical element and optical system having the same
    8.
    发明授权
    Diffractive optical element and optical system having the same 失效
    衍射光学元件和具有该衍射光学元件的光学系统

    公开(公告)号：US06760159B2

    公开(公告)日：2004-07-06

    申请号：US09568057

    申请日：2000-05-10

    申请人： Takehiko Nakai

    发明人： Takehiko Nakai

    IPC分类号： G02B518

    CPC分类号： G02B27/4211 ,  G02B5/1823 ,  G03H2240/23

    摘要： In a diffractive optical element, which is formed by laminating at least three layers of diffraction gratings made of at least three kinds of materials which differ in dispersion, at least three design wavelengths are set.

    摘要翻译： 在通过层叠由至少三种不同色散的材料制成的至少三层衍射光栅形成的衍射光学元件中，设置至少三个设计波长。