Minolta Company, Ltd.

Teruo Ichikawa

Kazunari Mizuguchi

Katsutoshi Tsurutani

Yoshiiku Kikukawa

Kenji Hamaguri

Shinji Shimizu

Mitsuo Washino

A calibrating system of a display characteristic measurement apparatus includes a calibration pattern display unit for displaying a calibration pattern at substantially the same luminescence characteristic as that of a display apparatus to be measured, an image pickup unit provided in a display characteristic measurement apparatus for picking up a calibration pattern displayed on the display apparatus to generate image data, and a calculator for calculating, based on the generated image data, calibration data for the display characteristic measurement apparatus.

Calibration pattern display system, and a system and method for calibrating a display characteristic measurement apparatus

A CRT measurement device includes an image pickup device for producing an electrical image signal with respect to a light image displayed on the CRT, an optical system having a movable focusing lens for providing a light image of varied sharpness to the image pickup means in accordance with position of the focusing lens, a sharpness detector for detecting the sharpness of a picked up image based on an electrical image signal each time the focusing lens is moved, a focal position detector for detecting a focal position of the focusing lens providing a most sharpness light image, a driver for driving the focusing lens so as to move to the detected focal position, and calculator means for calculating a characteristic of the color CRT based on the image signal produced when the focusing lens is at the focal position. This device assures automatic and accurate focusing.

Device for measuring characteristics of a color cathode ray tube

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Gamagori, Japan

Teruo Ichikawa