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    • 9. 发明授权
    • Optical low pass filter
    • 光学低通滤波器
    • US4998800A
    • 1991-03-12
    • US331961
    • 1989-04-03
    • Yasuaki NishidaKatsuya FujisawaYoshihiro FujitaMasao FujiwaraShigeo YoshikawaMasao Uetsuki
    • Yasuaki NishidaKatsuya FujisawaYoshihiro FujitaMasao FujiwaraShigeo YoshikawaMasao Uetsuki
    • G02B27/46H01L27/14H04N5/225H04N9/07
    • H04N5/2254G02B27/46
    • An optical low pass filter for use in an imaging device including an objective lens and a solid state image sensor forming a plurality of picture elements thereon, which filter comprises a diffraction grating disposed between the objective lens and the solid state image sensor. The diffraction grating is of a type which the periodicity of an image of the diffraction grating projected onto the solid state image sensor by the objective lens is selected to be twice or 1/n of the periodicity of the picture element, wherein n represents an integer. The applicable imaging device may be of a type comprising an objective lens, a solid state image sensor forming a plurality of picture elements thereon, and a color filter array disposed on the solid state image snesor and including a plurality of sets of different color filter elements, or of a type comprising a single tube type color imaging device having an evacuated glass envelope, an objective lens and a color filter array including a plurality of sets of different color filter elements.
    • 一种用于包括物镜的成像装置和在其上形成多个像素的固态图像传感器的光学低通滤波器,该滤波器包括设置在物镜和固态图像传感器之间的衍射光栅。 衍射光栅是通过物镜投影到固态图像传感器上的衍射光栅的图像的周期性被选择为像素的周期的两倍或1 / n的类型,其中n表示整数 。 可应用的成像装置可以是包括物镜,在其上形成多个像素的固态图像传感器和设置在固态图像打鼾器上的滤色器阵列的类型,并且包括多组不同的滤色器元件 或包括具有抽真空玻璃外壳的单管式彩色成像装置,物镜和包括多组不同滤色器元件的滤色器阵列的类型。