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    • 8. 发明专利
    • PHOTOMETER FOR SLIT LAMP
    • JPS5578218A
    • 1980-06-12
    • JP15096478
    • 1978-12-08
    • NIPPON CHEMICAL IND
    • UMEMURA IZUMIARAI TOSHIYUKI
    • G01J1/04A61B3/12G01J1/60
    • PURPOSE:To measure photometry for the desired position in the screen without losing framing, by providing the projection optical system in which a plurality of photo detectors are located in scattering between the measuring optical system and the observed image to move the light emitting elements corresponding to the photo detectors. CONSTITUTION:The light flux from the inspected eye 2 illuminated with the slit light flux from the illumination optical system 1 is parallel through the objective lens group 3, and after the beam splitters 4, 14, 24 of the first, second and third, the observed image of the inspected eye is formed on the focus 6 of the second objective lens 5 and it can be observed through the eyepiece lens 8. The light of the first splitter 4 is picked up on the film 11, the light flux from the second splitter 14 is formed on the photo electric converters 17a... located in straight line with plurality, and the light flux from the third splitter 24 is inputted to the light emitting diodes located corresponding one to one to the elements 17a.... The inspector 7 can observe the image of tested eye on the image of the light emitting diode 27, and when the light signal from the element 17 corresponding to this image is used as the light measurement signal, suitable photometry can be made without losing framing.
    • 9. 发明专利
    • MEASUREMENT DEVICE FOR VISIBILITY DEGREE
    • JPH07140003A
    • 1995-06-02
    • JP28543093
    • 1993-11-16
    • MATSUSHITA ELECTRIC IND CO LTD
    • YAMANAKA YASUHIKOTAKEUCHI TETSUJI
    • G01J1/00G01J1/02G01J1/42G01J1/60G01W1/00
    • PURPOSE:To measure a visibility degree in a condition of existence of smoke in a tunnel or in fog. CONSTITUTION:A background luminance-measuring section 1 measures background luminance of an object and an object luminance-calculating section 2 calculates luminance of the object from the background luminance. An optical screen luminance-measuring section 3 measures luminance of an optical screen that is generated between the object and an observer and a penetration rate-measuring section 4 measures a penetration rate of a light. A background apparent luminance-calculating section 5 calculates apparent luminance of a background from the background luminance, luminance of the optical screen and penetration rate and an object apparent luminance-calculating section 6 calculates apparent luminance of the object from the luminance of the object, luminance of the optical screen and penetration rate. A luminance difference-calculating section 7 calculates a luminance difference DELTAL of the apparent luminance. An equivalent optical screen luminance-measuring section 9 measures equivalent optical screen luminance in terms of an eye of the observer and a central hole adaptation luminance-measuring section 8 measures central hole luminance in terms of the eye. A luminance difference distinction threshold-calculating section 10 calculates a luminance difference distinction threshold DELTALmin in terms of the eye of the observer from the above luminance. A visibility degree-calculating section 11 calculates a visibility degree from the luminance difference DELTAL and luminance difference distinction threshold DELTALmin.
    • 10. 发明专利
    • VISIBILITY MEASURING APPARATUS
    • JPS63191034A
    • 1988-08-08
    • JP2272487
    • 1987-02-03
    • MATSUSHITA ELECTRIC IND CO LTD
    • MOMOTA ATSUKOYOSHIMURA YOSHINORITAKEUCHI TETSUJI
    • G01J1/02G01J1/60
    • PURPOSE:To determine visibility accurately when an actual object is viewed, by calculating the visibility of the object from the difference between the brightness of the object and that of its background and from a brightness difference threshold. CONSTITUTION:A brightness distribution measuring section 1 measures a brightness distribution object-wise in a field of view containing an object and outputs a signal corresponding to brightness to a brightness difference calculating section 3, which calculates the difference between the brightness of objects and that of its background adjoining thereon. A brightness difference threshold calculating section 6 receives outputs from an equivalent photoscreen brightness measuring section 4 and a center cavity adaptive brightness measuring section 5 to calculate a brightness difference threshold when objects are observed. A visibility calculating section 7 calculates visibility of individual objects from a signal inputted from the brightness difference calculating section 3 and a signal inputted from the brightness difference threshold calculating section 6. Thus, a signal is outputted to a visibility distribution chart display section 8 according to the visibility of the objects.