| 摘要 |
An optical colour-splitter arrangement in an opto-electrical colour scanner has a colour-splitter for spectral decomposition of a light beam into at least two coloured light beams of different spectral ranges, and corrector devices in the coloured light beams which improve the colour selectivity of the colour splitter. Each corrector device (2B or 2R; 2G) consists of two dichroic mirrors (12B; 13B or 12R; 13R; 12G; 13G) arranged one behind the other on the optical axis, whose reflecting surfaces adopt a normal position with respect to the optical axis. Each dichroic mirror can be rotated out of the normal position, and thus the transmitting and blocking regions of the dichroic mirrors can be varied. As a result, the colour selectivity of the colour splitter can be increased by restricting the spectral ranges transmitted. |
