| 摘要 |
An improved light composer for use in duplicating film which illuminates each frame of film with an even and thoroughly diffused source of light delivered over a distance in order to prevent the replication of scratches and other surface imperfections in the master copy. The improved light diffuser comprises a light mixer with two opposed ends. The surface of the mixer is optically rough but reflective. A means for scattering light typically covers one of the ends of the mixer. Such means may be a plurality of clear lenses, each having a focal length substantially less than the length of the mixer. In such a case, light is refracted by a plurality of lenses and propagates along the length of the mixer by means of a multiplicity of reflections, whereby a plane opposed to the plurality of lenses is illuminated by a thoroughly diffused and even source of light. One or more scattering means may be combined into a plurality of stages with shutters to produce fades and dissolves on the duplicate copy of film.
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