Optical low-pass filter without using polarizers

摘要

An optical low-pass filter comprising a liquid crystal device or electrooptic device having a birefringent phenomenon and formed so as to be able to vary the birefringent amount of the incident light. This low-pass filter is favorably used to remove the Moiré without so much reducing the resolving power in a television camera, electronic camera or fiberscope provided with a solid-state image sensor.