Abstract: An optical color-splitter arrangement comprises a color splitter for spectral resolution of a light beam into at least two chromatic light beams of different spectral ranges. A correction device is arranged in each of the chromatic light beams for improving a color selectivity of the color splitter. Each of the correction devices has at least two dichroitic mirrors successively arranged on an optical axis of the respective chromatic light beam, each dichrotic mirror being arranged relative to the optical axis so as to define a normal operating position angle of incidence for the corresponding dichroitic mirror.

Abstract: Diaphragm arrangement for point-by-point electro-optical scanning of originals, whereby the scan point is composed of a central main field and of a surrounding field surrounding the main field. A diaphragm for scanning the main field and a second diaphragm for scanning the surrounding field are provided, whereby the sizes of the diaphragm apertures of the two diaphragms are continuously adjustable independently of one another, whereby the diaphragm apertures of the first diaphragm define the size of the main field and, thus, the scanning fineness and the inside diameter of the surrounding field, and the diaphragm aperture of the second diaphragm defines the size of the surrounding field, and whereby the size relationship between main field and surrounding field is continuously adjustable on the basis of the independent and continuous adjustment of the two diaphragm apertures.

Abstract: Point-to-point film exposure for recording rasters continuous tone images and linework characters in scanner technology wherein the exposure spot is defined by the light intensity, the size, the focus and intensity distribution which are controlled to achieve a uniform and high contrast exposure.