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公开(公告)号：GB2017296B
公开(公告)日：1982-07-21
申请号：GB7908868
申请日：1979-03-13
Applicant: SONY CORP
Abstract: Apparatus for detecting the color temperature of a source of light for use in, for example, a color television camera. First and second semiconductor photo-sensing elements are connected in series and are oppositely poled with respect to each other. Light of predetermined, respective colors having respectively different spectral characteristics is supplied to the first and second photo-sensing elements, for example, through different light filters. An output signal is derived from the opposite ends of the series circuit representing the color temperature of the light source. In a preferred embodiment, the output signal is produced by an operational amplifier having a pair of inputs, one of which being connected to one end of the series circuit, an output connected to the opposite end of the series circuit, and a resistance connected between the two inputs of the operational amplifier, the derived output signal being a voltage across the operational amplifier output and other input. In one application, the output voltage produced by the operational amplifier is supplied to a differential amplifier which, in turn, provides first and second voltages representing the relative intensities of the light received by the photo-sensing elements. The difference between these first and second voltages is combined with first and second color video signal components, respectively, such as color difference signals, so as to vary the levels of these respective color video signal components. The first and second voltages also are used to adjust the levels of the respective color video signal component outputs from the combining means so as to be substantially equal to the white balanced levels thereof at a predetermined color temperature. In another application, the voltage produced by the operational amplifier is supplied to the differential amplifier by yet another amplifier, and the differential amplifier includes a constant current source having a control input supplied with a color component voltage, such as the red color signal voltage VR or the blue color signal voltage VB. The differential amplifier has a single output for providing a white-balanced red or blue color signal voltage.
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公开(公告)号：AU506177B2
公开(公告)日：1979-12-13
申请号：AU3183677
申请日：1977-12-21
Applicant: MILES LAB
Inventor： KRAMER D L , WHITE J A
Abstract: Apparatus for measuring reflected or transmitted light is described. The apparatus comprises filter type spectrophotometer having a wavelength range of from about 200 nm (nanometers) to about 1,100 nm which includes a sample illuminating light source capable of producing an extremely intense light of short duration; light diffusing means; a light filter for transmission of a selected wave-length; at least two independent light sensing means; and separate means defining light transmission paths for the passage of light from the light source to one light sensing means and from the illuminated sample to the other light sensing means.
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Patent Agency Ranking
公开(公告)号：FR2360825A1
公开(公告)日：1978-03-03
申请号：FR7723743
申请日：1977-08-02
Applicant: DU PONT
Abstract: A device for producing variable colors from projected white light and quantifying the color changes resulting therefrom is provided which is useful in color-styling designs and color shade matching. The device comprises (1) an adjustable color filter having at least two primary-color areas upon which a portion of said projected white light is incident, (2) light-attenuation means which attenuates the quantity of light transmitted from (by attenuating either the incident white light or transmitted color light) each of the primary-color areas as well as the portion of the projected light which is transmitted unfiltered, and (3) control means comprising (a) a light-measuring unit for measuring the transmitted light and generating a signal proportional to the amount of light measured, (b) means responsive to said signal to determine the quantity of each component of transmitted light present and (c) means responsive to (b) for controlling each of the light-attenuation means.
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48.发明专利
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