| 摘要 |
The invention relates to a multimirror device for rotating the polarization of an electromagnetic signal, especially a light signal, through 90°, the output ray having approximately the same direction as the input ray. This device comprises at least one combination (40) of three mirrors (42, 44, 46) which are arranged in such a way that a ray entering one of the mirrors at an angle of incidence of 45° is reflected at the same angle off the other mirrors, the polarization vector (V) of the incident ray being presented in such a way with respect to the mirrors that a reflection off one of the three mirrors changes the direction of polarization while the reflections off the other two mirrors does not change this direction of polarization. Preferably, a plurality of multiple-mirror combinations (40, 40', 40'') is provided on a sheet, each combination forming a pattern which is repeated regularly, the patterns all having identical shapes and sizes.
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