Focus voltage tracking circuit

Details Focus voltage tracking circuit Focus voltage tracking circuit

1998-06-19

2000-09-05

Lee, Michael H.

Television

Video display

Cathode-ray tube

315382, H04N 322, H01G 2958

Patent

active

061150851

ABSTRACT:
A direct current focus voltage applied to a focus electrode of a cathode ray tube that produces a blue image is set to slightly defocus the blue image for increasing the blue beam spot size. The increase in the blue beam spot reduces the saturation and allows brighter blue and increased blue video drive range. A passive network is coupled between an ultor electrode and the focus electrode to provide tracking of focus voltage-to-ultor voltage ratio. The tracking prevents voltage fluctuation of the ultor voltage produced by video loading from disturbing uniform defocussing in the entire blue image.

REFERENCES:
patent: 3818305 (1974-06-01), Dumas
patent: 4214188 (1980-07-01), Bafaro et al.
patent: 4230972 (1980-10-01), Bafaro
patent: 4825129 (1989-04-01), Nero
patent: 5430358 (1995-07-01), George
patent: 5486741 (1996-01-01), George
patent: 5565746 (1996-10-01), George
Nokia Service Manual for Chassis 445M/X, 21.increment. Colour Monitor, Salo, Finland, ZB1532, 11.93, cover pg., Figure 3 High Voltage Supply SMM046, Section 3. High Voltage Supply, 3 pgs.
*US 5,705,900 issued Jan. 6, 1998 corresponds to DE 195 29 136 **UK 2 239 148 corresponds.
Copy of German Search Report.

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