Patent ID: 6356342
Filing Date: 2002-03-12
Classification: B41B,G02B,H04N

Abstract:
A method of exposing light-sensitive materials, such as films and printing plates, by means of modulated light, wherein a first light beam is conducted from a light source with the wavelength &lgr;1 to a first exposure point on the light-sensitive material via an optical system comprising at least one input end and one output end as well as at least one optical rotating reflecting or transmitting element arranged relatively to the optical output end, wherein at least one additional light source generates an additional light beam with a wavelength &lgr;x which is different from &lgr;1, said additional light beam with the wavelength &lgr;x being conducted via the input end of the optical system to the output end of the optical system so as to be geometrically coincident with the first light beam, said additional light beam being conducted from the output end of the optical system to an additional exposure point on the light-sensitive material in dependence on &lgr;x or on the difference between wavelengths &lgr;1 and &lgr;x, wherein the light beams are conducted from the individual light source to an exposure point through optical fibers via the optical system, wherein a rotating optical element with wavelength-splitting properties reflects or transmits the light to the exposure point in dependence on the wavelength of the light.