Optics: measuring and testing – Photometers – Photoelectric
Patent
1979-12-03
1982-06-22
Corbin, John K.
Optics: measuring and testing
Photometers
Photoelectric
350311, 354 59, G01J 142, G02B 522
Patent
active
043359590
ABSTRACT:
A plastic optical element having especially selected spectral transmission characteristics is structured to collect and direct radiation from a photographic scene onto the surface of a photodetector which operates to generate an output signal that can be used to predict an exposure value for the scene as based on the magnitude of the output signal. In combination with the photodetector, which is preferably a silicon photodiode, the optical element defines a photoelectric radiometer which has a preferred relative spectral sensitivity in the visible and near infrared region of the spectrum. The preferred spectral sensitivity of the radiometer is particularly suitable for evaluating the exposures required in high contrast scenes. The spectral transmission characteristics of the optical element are provided by selected metal-organic infrared absorbing dyes, preferably one dithiol metal complexes, that are uniformly distributed in low concentrations throughout the optical element in a novel injection molding process. The preferred plastic for the optical element is polycarbonate or polystyrene.
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Arnold Bruce Y.
Caufield Francis J.
Corbin John K.
Polaroid Corporation
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