Solid-state imaging device into which optical low pass filter is integrated

摘要

There is provided a solid-state imaging device into which an optical low pass filter serving as the transparent window thereof is integrated. This integrated structure simplifies the configuration of the imaging system, reducing its size and manufacturing cost. The optical low pass filter is configured of an optical phase grating low pass filter to obtain satisfactory frequency characteristics. The optical low pass filter is constructed in such a manner that a grating with a predetermined thickness, generating the phase shift of phi , a grating whose thickness is twice the phi -phase shift grating, generating the phase shift of 2 phi , and a grating portion generating the phase shift of 0 form a basic pattern, the basic pattern being periodically arranged.