Electro-optically controlled lens for laser printer

摘要

The invention relates to an electrooptically controlled lens, comprising an electrooptical crystal plate, especially a lithium niobate or lithium tantalate plate cut in the Z direction, and electrodes placed on the surface of the crystal in order to apply an electric field. Essential to the invention is the fact that the crystal plate (9) has at least one area (10) in which the direction of spontaneous polarization is inverted in relation to a normal direction in the remaining areas, that this area (10) is bounded in the planes perpendicular to the normal direction by at least one curved line and that a single electrode (11 or 12), respectively placed on the topside of the crystal and on the underside of the crystal, having a rectangular design and overlapping at least all of the inversion area (10), is provided.