Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1978-06-19
1980-10-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 13C, 335213, 358 60, H01J 2970, H01J 2976
Patent
active
042271223
ABSTRACT:
In a convergence device for a three primary-color projection type color television system with three cathode-ray tubes, it is known to use two separate cores respectively for dynamic and static convergence correction. In the present invention a single core is used and the core is provided with eight pole pieces aligned along the vertical, horizontal and two diagonal axes, each pole piece having a winding therearound. The vertically and horizontally aligned pole pieces are used to correct horizontal and vertical dynamic convergence respectively. The diagonally aligned pole pieces are used for both the horizontal and vertical static convergence correction by producing magnetic fields horizontally and vertically. The construction is much simpler than the prior art, and the correction of dynamic and static convergence which is required as a result of the difference in incident angles between electron beams projected on a screen can be easily attained.
REFERENCES:
patent: 3622835 (1971-11-01), Parker
patent: 4027219 (1977-03-01), Van Alphen et al.
Fujisawa Seiji
Yukumoto Toshitaka
Blum Theodore M.
Matsushita Electric - Industrial Co., Ltd.
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