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    • 7. 发明专利
    • LANDING MEASUREMENT DEVICE
    • JP2001078237A
    • 2001-03-23
    • JP24705099
    • 1999-09-01
    • NIPPON DENKI HOME ELECTRONICS
    • HIRASAWA KOICHI
    • H01J9/42H04N17/04
    • PROBLEM TO BE SOLVED: To provide a landing measurement device that measures landing with respect to the luminance on a CRT screen through magnification while keeping the resolution of a landing measured value constant. SOLUTION: An amplifier 107 with a fixed gain of an amplification factor A amplifies luminance signal voltage without the use of an AGC or a variable gain amplifier. A voltage source 10 is controlled so that the output voltage of a peak hold circuit 108 comes to the center of a measurement range of an A/D converter 109. Through the configuration above, the resolution in fetching the luminance change caused when a coil 110 changes the magnetic field in the vicinity of the measurement point by an A/D converter is made constant against the contrast caused by a landing offset on a CRT screen to be measured and deterioration in the luminance uniformity. The landing offset is calculated by multiplying (luminance without a luminance change/application of magnetic field) by a correction coefficient. Since the luminance without applied magnetic field is larger than a luminance change, the resolution of the measured value of the landing offset is made constant.