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US5434709A Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers 失效
波长选择相位光栅型光学低通滤波器，其包括透明层之间的粘合剂层

Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers
摘要：
In a wavelength-selective phase-grating type optical low-pass filter including at least a pair of adjacent first and second transparent layers, there is provided at least one adhesive layer through which a pair of adjacent first and second transparent layers stacked on each other in a phase grating form for generating a phase difference distribution on the boundary surface between the pair of adjacent first and second transparent layers. The optical low-pass filter satisfies the following conditions under a condition of 470 nm .nu.d2, and (c) 0.9
摘要（中）：

在包括至少一对相邻的第一和第二透明层的波长选择相位光栅型光学低通滤波器中，设置有至少一个粘合剂层，一对彼此堆叠的相邻的第一和第二透明层 用于在所述一对相邻的第一和第二透明层之间的边界表面上产生相位差分布的相位光栅形式。 光学低通滤波器在470nm <λ<580nm的条件下满足以下条件：（a）No（λ）= Ni（λ），（b）nu d1 nu d2， 和（c）0.9

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