Method of adjusting position of deflection york

Abstract

Abstract PURPOSE:To enable a deflection york to be installed in an optimum position by obtaining the area level of a luminous phosphor area located around the picture tube while moving the defelction york back and forth to find two positions for which the area levels of luminous areas are smaller than the maximum area level and positioning the deflection york at the middle between the two positions. CONSTITUTION:A scan signal from the synchronous controlling circuit 32 of the image pickup system is fed into image pickup devices 21A-21D to read out image pickup data thereby obtaining high quality data corresponding to the area level and the spape of a luminous area of green phosphor (G). Then a data level obtained by adding thus obtained areas is successively supplied to an area-judging device 25. During the time when a deflection york 13 is moved, the area-adjusting device 25 obtains the area levels (SA) and (SB) of luminous areas of green phosphor (G) equal to a predetermined area level (S0) thereby finding positions (A) and (B) of the deflection york 13 for the areas (SA) and (SB). According to the thus obtained result, a controlling device 27 moves the deflection york 13 to position (C) located at the middle between positions (A) and (B).

Inventors

• 👤 Shinichi Uno
• 👤 宇野　伸一
• 👤 Riyuuhachirou Douro
• 👤 堂路　隆八郎
• 👤 Mitsuji Inoue
• 👤 井上　三津二

Bibliographic Details