Television – Monitoring – testing – or measuring – Testing of image reproducer
Patent
1996-06-24
1998-09-01
Lee, Michael
Television
Monitoring, testing, or measuring
Testing of image reproducer
348190, 31536811, 315 115, H04N 1700, H04N 1702
Patent
active
058017682
ABSTRACT:
Adjustment of an electron beam landing position during thermal expansion of a shadow mask in a color cathode ray tube (CRT) on a production line of color television receivers is performed by calculating an optimum compensation value and converting the compensated data into a coordinate value and displaying it on the screen to decrease the conducting time of the CRT, and improve accuracy and uniformity of purity adjustment. A purity adjusting apparatus includes a time measuring part for measuring the conducting time of a color CRT, a reference drift data calculating part for storing thermal expansion characteristics of a shadow mask of the color CRT, a temperature/brightness measuring part for measuring temperature and brightness of the faceplate of the color CRT, a computing part for calculating compensation value of the beam landing position from the above data, and a display part for displaying an aiming point presuming perfect stabilization against the thermal expansion of the shadow mask from the calculated result on a monitor. Thus, purity can be adjusted in a shorter period and with better accuracy.
REFERENCES:
patent: 4035834 (1977-07-01), Drury
patent: 4137548 (1979-01-01), Kelly et al.
patent: 4602272 (1986-07-01), Duschl
patent: 4635095 (1987-01-01), Legrand et al.
patent: 4814858 (1989-03-01), Mochizuki et al.
patent: 5432549 (1995-07-01), Hassler et al.
Search report dated 22 Aug. 1996.
Kobori Toshimi
Sudo Yasunobu
Lee Michael
Matsushita Electric - Industrial Co., Ltd.
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