COLOUR TEMPERATURE DETECTING APPARATUS

    公开(公告)号:GB2017296A

    公开(公告)日:1979-10-03

    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.

    APPARATUS FOR MEASURING LIGHT INTENSITIES

    公开(公告)号:AU3183677A

    公开(公告)日:1979-06-28

    申请号:AU3183677

    申请日:1977-12-21

    Applicant: MILES LAB

    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.

    33.
    发明专利
    未知

    公开(公告)号:ATA226976A

    公开(公告)日:1978-12-15

    申请号:AT226976

    申请日:1976-03-29

    Applicant: SIEMENS AG

    Abstract: A two-beam colorimeter comprising an incandescent lamp, a resistor connected electrically in series with the incandescent lamp, a condenser and an interference filter disposed in side by side relation adjacent said incandescent lamp, a two-hole diaphragm for developing a comparison light beam and a measuring light beam, a reference filter disposed in the path of the comparison light beam, and an adjusting filter movable into and out of the path of the measuring light beam.

    Colour meter providing direct reading of three colour values - has filter mirrors for directing light to sample through integration sphere and heat shielding filter

    公开(公告)号:DE2710722A1

    公开(公告)日:1978-09-14

    申请号:DE2710722

    申请日:1977-03-11

    Applicant: SUGA SHIGERU

    Inventor: SUGA SHIGERU

    Abstract: The colour meter providing e.g. a direct reading of three, colour stimulus values includes a hollow integrating sphere (1) with a filter mirror system directing light into the sphre, and a measuring unit. A lamp (11) lenses (6, 7) a heat shield (9) and a pinhole (8) direct a beam of light into the sphere. A filter mirror assembly (13) is mounted behind the lamp to reflect light to augment the beam etc. A sample (3) is mounted to be illuminated by the light beam with reflected light passing through a port (5) in the sphere to the measuring unit (15), through a filter (17). The energising voltage of the lamp is kept constant by a control (10) with the filter mirror system and the filter assembly (17) being adjusted simultaneously to the different selected colours.

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