Grating Optical Low-Pass Filter

概要

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The spurious signals appearing in the picture image from a charge-coupled semiconductor device (CCD) camera were removed by means of a novel grating optical low-pass filter (GOLF). By placing the GOLF near the imaging plane of the CCD and adjusting the effective grating period projected onto the imaging plane with respect to the array period, or its integral multiplicative inverse of the picture elements formed in the imaging plane, it was verified that the GOLF eliminated the grating image superimposed on the picture image, which had been a long-standing problem. Photochemical reaction was useful for forming a sinusoidal grating crosssection which increased the MTF value in the region of low spatial frequencies to realize a clear-cut picture image. The GOLF fabricated in the form of a thin plate was promising to realize a new CCD with a built-in optical low-pass filter applicable for downsizing of camera optics.
社団法人応用物理学会の論文
1996-03-15