OPTICAL DEVICE

摘要

A liquid crystal active lens having a combination of a fixed focus lens having a high refractive index and a phase modulation element having a two-dimensional arrangement of very small pixels which has a power, and whose lens characteristics can be controlled electrically as a spatial function. With this lens, it is possible to implement the control of an optical system electronically without any movable parts. The focal length can be controlled electronically by a structure in which a liquid crystal spatial phase modulation element and a fixed-focus high power lens are coupled. Further, a spatial division control is possible by electronic control of the lens.