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    Diffractive optical element and optical system having the same
    1.
    发明公开
    Diffractive optical element and optical system having the same 审中-公开
    Beugungselement und damit ausgestattetes optisches系统

    公开(公告)号：EP1193512A2

    公开(公告)日：2002-04-03

    申请号：EP01308170.8

    申请日：2001-09-26

    申请人： CANON KABUSHIKI KAISHA

    发明人： Nakai, Takehiko, c/o Canon Kabushiki Kaisha

    IPC分类号： G02B5/18 ,  G02B27/44

    CPC分类号： G02B5/1895 ,  G02B5/1814 ,  G02B5/1876 ,  G02B27/0037 ,  G02B27/4211 ,  G02B27/4272 ,  G02B27/4277

    摘要： Disclosed is a diffractive optical element which is made of at least two materials of different dispersions and which includes at least two diffraction gratings being accumulated one upon another, wherein each diffraction grating is formed on a curved surface of a substrate, and wherein a diffraction grating, of the at least two diffraction gratings, in which a curvature radius of the curved surface and a curvature radius of a grating surface in a portion where a grating pitch is largest, have different signs, is one of the at least two diffraction gratings which has a smallest grating thickness.

    摘要翻译： 公开了一种衍射光学元件，其由至少两种不同分散体的材料制成，并且包括至少两个彼此堆积的衍射光栅，其中每个衍射光栅形成在基板的弯曲表面上，并且其中衍射光栅 在所述至少两个衍射光栅中，所述曲面的曲率半径和光栅间距最大的部分中的光栅表面的曲率半径具有不同的符号，是所述至少两个衍射光栅中的一个，所述至少两个衍射光栅是 具有最小的光栅厚度。

    Image reading apparatus with reflection type blazed diffraction grating for color separation
    7.
    发明公开
    Image reading apparatus with reflection type blazed diffraction grating for color separation 失效
    BildlesegerätfürFarbtrennung mit einem Beugungsgitter vom Reflektionstyp。

    公开(公告)号：EP0533066A2

    公开(公告)日：1993-03-24

    申请号：EP92115565.1

    申请日：1992-09-11

    申请人： CANON KABUSHIKI KAISHA

    发明人： Nakai, Takehiko, c/o Canon Kabushiki Kaisha

    IPC分类号： H04N1/46

    CPC分类号： H04N1/488

    摘要： A color image reading apparatus is provided wherein a color picture image is read out by a monolithic three line sensor (4) through a reflection type one-dimensional blazed diffraction grating (3) acting as a color separating means. The diffraction grating is concavely curved toward the line sensor, and a light beam, diverging after being focused by an image forming optical element having a predetermined refracting power only in a sub-scan cross section, is color-separated into three color light components by the diffraction grating and re-imaged on the surface of the three line sensors (8,9,10) located at a predetermined position. As a result, the blur of ± 1 order diffracted lights in a sub-scanning direction can be prevented which is due to the deviation of a reflective diffraction angle resulting from the difference in an incident angle of respective lights on the grating surface in the sub-scan cross section. At this time, a convergent spherical wave that is a light beam emerging from the image forming optical system enters the diffraction grating.

    摘要翻译： 提供一种彩色图像读取装置，其中彩色图像由单片三线传感器（4）通过用作颜色分离装置的反射型一维闪耀衍射光栅（3）读出。 衍射光栅向线传感器凹入弯曲，并且仅在副扫描截面中由具有预定折射能力的成像光学元件聚焦之后发散的光束通过以下方式被颜色分为三种颜色的光分量： 衍射光栅并重新成像在位于预定位置的三条线传感器（8,9,10）的表面上。 结果，可以防止副扫描方向上的+/- 1级衍射光的模糊，这是由于由光栅表面上的各个光的入射角的差异导致的反射衍射角的偏差 子扫描横截面。 此时，作为从成像光学系统出射的光束的收敛球面波入射入衍射光栅。

    Scanning optical apparatus
    8.
    发明公开
    Scanning optical apparatus 失效
    OptischesAbtastgerät。

    公开(公告)号：EP0423812A2

    公开(公告)日：1991-04-24

    申请号：EP90120090.7

    申请日：1990-10-19

    申请人： CANON KABUSHIKI KAISHA

    发明人： Kondo, Kazuyuki, c/o Canon Kabushiki Kaisha ,  Tateoka, Masamichi, c/o Canon Kabushiki Kaisha ,  Nakai, Takehiko, c/o Canon Kabushiki Kaisha

    IPC分类号： G02B26/10 ,  G02B5/08

    CPC分类号： G02B5/09 ,  G02B26/129

    摘要： A scanning optical apparatus has a light source for emitting a light beam, and a deflector such as rotatable polygonal mirror (7) having a plurality of mirror surfaces (7A, B) for deflecting the light beam emitted from the light source (3). Each mirror surface (7A, B) of the rotatable polygonal mirror (7) has a pair of reflecting surfaces (7A, B) inclined toward the center axis of rotation of the polygonal mirror (7) and orthogonal to each other. A fixed reflecting mirror (9) is arranged in opposed relationship with one of the pair of reflecting surfaces so that the light beam deflected by the deflector is reflected to be returned to the deflector again.

    摘要翻译： 扫描光学装置具有用于发射光束的光源以及具有用于使从光源（3）发射的光束偏转的多个镜面（7A，B）的可旋转多面镜（7）的偏转器。 可旋转多面镜（7）的每个镜面（7A，B）具有朝向多面镜（7）的旋转中心轴倾斜并且彼此正交的一对反射表面（7A，B）。 固定的反射镜（9）与一对反射表面中的一个对置地布置，使得由偏转器偏转的光束被反射以再次返回到偏转器。