Method for the correction of the wave surface of an optical beam by means of a deformable mirror and mirror used in this method

摘要

A transformer for transferring power or transmitting signals between first and second members arranged for limited rotational and/or translational movement comprises a first coil (455) carried by a first member (451) and a second coil (454) carried by a second meber (456) and core means (453) for establishing a closed magnetic path extending through the first and second coils (455, 454). The core means include a a U-shaped core member (453a) made from high frequency magnetic material. A closure member (453b) made from high-frequency magnetic material is arranged so as to be movable between a rest position allowing the second coil (454; 464) to be inserted between the legs of the core member (453a) and an operating position overlying the legs of said core member. The cover member (453) in ist operating position extends through the second coil (454; 464) under play conditions.