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    • 28. 发明授权
    • Image display device with optical low-pass filter
    • 具有光学低通滤波器的图像显示装置
    • US5737042A
    • 1998-04-07
    • US521477
    • 1995-08-30
    • Masayuki ShinoharaShigeru Aoyama
    • Masayuki ShinoharaShigeru Aoyama
    • G02B27/46G02F1/1335G09F9/00
    • G02B27/46G02F1/133504
    • An image display device is so adapted as to eliminate both largest and next largest noise components. The image display device includes an image display body having a plurality of pixels arranged periodically in two dimensions and an optical low-pass filter placed on or above the front surface of the image display body. One of two cut-off spatial frequencies in at least one direction of the optical low-pass filter is set within a range of values greater than 1/4 and less than 3/4 of a specific sampling frequency (that having the second lowest frequency) among sampling frequencies determined by the pixel arrangement of the image display body, and the other of the two cut-off spatial frequencies is set within a range of values greater than 3/4 and less than 5/4 of the specific sampling frequency, where the specific sampling frequency is taken as being 1.
    • 图像显示装置适于消除最大和最大噪声分量。 图像显示装置包括具有二维周期性排列的多个像素的图像显示体和位于图像显示体的前表面上方的光学低通滤波器。 在光学低通滤波器的至少一个方向上的两个截止空间频率之一被设置在大于+ E,fra 1/4 + EE且小于+ E的值的范围内,3/4 + EE 具有由图像显示体的像素排列确定的采样频率中的特定采样频率(具有第二最低频率),并且两个截止空间频率中的另一个被设置在大于+ E的值的范围内, 3/4 + EE,小于+ E,以5/4 + EE为特定采样频率,其中采样频率为1。
    • 30. 发明授权
    • Optical device and optical pickup device using the same
    • 光学装置和使用其的光学拾取装置
    • US5122903A
    • 1992-06-16
    • US492489
    • 1990-03-12
    • Shigeru AoyamaTatsuo OhgakiTukasa Yamashita
    • Shigeru AoyamaTatsuo OhgakiTukasa Yamashita
    • G02B3/08G02B5/18G11B7/135G11B11/10G11B11/105
    • G02B5/188G02B5/1876G02B5/189G11B7/1353
    • An optical element having a substrate and a composite grating pattern formed thereon. The pattern is constituted with two different kinds of grating patterns superimposed on the substrate. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern, a light focusing or collimating function (i.e. a lens function) is implemented. When the other pattern is formed in an equally separated linear grating pattern, the optical element develops the lens function and a function to diffract lights through the linear grating. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern and the other pattern is implemented in an unequally separated linear grating pattern, a lens function to focus lights onto a point and a cylindrical lens function to focus lights in a linear contour are obtained. Consequently, when parallel lights are incident to the optical element, there occurs astigmatism.
    • 具有形成在其上的基板和复合光栅图案的光学元件。 该图案由叠加在基板上的两种不同种类的光栅图案构成。 当在菲涅耳透镜图案中形成两种光栅图案中的一种时,实现光聚焦或准直功能(即透镜功能)。 当另一个图案以均匀分离的线性光栅图形形成时,光学元件产生透镜功能和通过线性光栅衍射光的功能。 当两种光栅图案中的一种形成为菲涅耳透镜图案并且另一图案以不均匀分离的线性光栅图案实现时,透镜功能将光聚焦到点和柱面透镜上,以将光线聚焦成线性 获得轮廓。 因此,当平行光入射到光学元件时,会出现散光。