VARIABLE FOCAL LENGTH LENS

摘要

A variable focal length lens (63) comprising micromirrors with pure translation is invented. The lens consists of many micromirrors and actuating components. The array of micromirrors with pure translation makes all lights scattered from one point of an object have the same periodic phase and converge at one point of image plane by using Fresnel diffraction theory. The actuating components control the positions of micromirrors electrostatically and/or electromagnetically. The optical efficiency of the micromirror array lens is increased by locating a mechanical structure upholding micromirrors and the actuating components under micromirrors. The known semiconductor microelectronics technologies can remove the loss in effective reflective area due to electrode pads and wires. The lens can correct aberration by controlling each micromirror independently. Independent control of each micromirror is possible by known semiconductor microelectronics technologies. The micromirror array can also form arbitrary shape and/or size of a lens.