Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1981-06-04
1983-09-13
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315381, 358 60, 358220, H01J 2952
Patent
active
044045000
ABSTRACT:
In projection television apparatus in order to prevent burning of the phosphor screen of at least one of the television projection tubes a display is not produced should there be an interruption or substantial reduction in the deflection current through one of the line or field deflection coils. Each deflection coil is connected in series with sensing means for separately sensing the deflection current flowing therethrough. In the event of one of the currents through one of the deflection coils being interrupted or substantially reduced means responsive to said sensing means prevents picture information from being applied to the control grids of the projection tubes.
REFERENCES:
patent: 3090889 (1963-05-01), Levinson
patent: 3399324 (1968-08-01), Brown
patent: 3848945 (1974-11-01), Holzrichter
patent: 4187451 (1980-02-01), Boekhorst
patent: 4227122 (1980-10-01), Fujisawa et al.
patent: 4297619 (1981-10-01), Kiteley
Blum Theodore M.
Oisher Jack
Streeter William J.
U.S. Philips Corporation
Wright Laurence A.
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