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Priority to BG9215190ApriorityCriticalpatent/BG50462A1/en
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Spectrum-dividing, optical elements, for colour-sensitive sensors in particular, are used in optical systems for detecting coloured objects. They have wide reflection zones and spectral characteristics, which are not dependent on technological errors. The spectrum-dividing, optical element consists of alternating layers of high and low reflection index, layered onto a pad. The coating consists of three groups of layers made of materials with low and high refraction indices. The medium group is a wide-band mirror of high reflection, while the end groups contain from 2 to 4 layers and have high permeability in the adjacent zone.
BG9215190A1990-06-061990-06-06Spectrum dividing optical element having a wide reflection zone
BG50462A1
(en)