VARIABLE OPTICAL FILTER AND DEVICES APPLYING SUCH FILTER

摘要

Variable optical filter, at least consisting of an optical filter structure (2) with different zones (3A-3B-3C-3D-3E) and/or reflection surfaces (4A-4B-4C-4D-4E-4F) which are made such that light (L1) with a well-defined wavelength passes, whereas light (L2) with another wavelength is reflected, in particular according to the so-called Bragg principle, whereby this filter (1-1A-1B-1C) also is provided with means (7) for altering the optical characteristics of the filter structure (2), characterized in that the aforementioned means (7) at least consist in that, on one hand, the optical path of the aforementioned filter structure (2) comprises a portion (6) based on one or more polymers, which is configured as an optical cavity enclosed by refractive surfaces of the aforementioned filter structure, and the optical characteristics of which can be changed under the influence of an electric potential, an electric field (E), respectively, or under the influence of light and, on the other hand, the filter (1) is provided with means (7) with which, in a controlled manner, an electric potential can be generated over, respectively, an electric field (E) in the aforementioned portion (6), and/or an optical field in this portion.