Television – Monitoring – testing – or measuring – Testing of image reproducer
Patent
1993-06-15
1995-08-08
Kostak, Victor R.
Television
Monitoring, testing, or measuring
Testing of image reproducer
348191, 348182, H04N 1704
Patent
active
054403405
ABSTRACT:
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.
REFERENCES:
patent: 4833541 (1989-05-01), Takuma et al.
patent: 4893925 (1990-01-01), Sweeney et al.
patent: 5032769 (1991-07-01), Kawakami
patent: 5216504 (1993-06-01), Webb et al.
Ichikawa Teruo
Kikukawa Yoshiiku
Mizuguchi Kazunari
Shimizu Shinji
Tsurutani Katsutoshi
Kostak Victor R.
Minolta Co. , Ltd.
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