| 摘要 |
<p>A beam splitter for color imaging apparatus is disclosed. The beam splitter comprises two prism elements (12, 14) which are joined together with a dichroic interference filter (15) interposed between the two elements. An input beam (30) to the beam splitter is divided into a first output beam (32) which is reflected from the filter (15) and a second output beam (34) which is transmitted through the filter (15). In order to provide a beam splitter of a generally triangular cross section in which one of the output beams (32) has the desired spectral content for a luminance channel in the imaging apparatus and the other output beam (34) has the desired spectral content for a chrominance channel, the interference filter (15) is formed of alternate layers of SiO2 and TiO2 and is disposed such that an input light beam (30) to the beam splitter has a relatively small angle of incidence on the filter.</p> |
