Colour television display apparatus provided with a cathode-ray tube专利检索-四极管电子零件及设备专利检索查询-专利查询网

Colour television display apparatus provided with a cathode-ray tube

阅读：992发布：2021-12-21

专利汇可以提供Colour television display apparatus provided with a cathode-ray tube专利检索，专利查询，专利分析的服务。并且Colour television display apparatus in which for correction of isotropic astigmatism a correction current flows through the coil halves of at least one deflection coil unit, which current is substantially a square function of at least one deflection current. As a result a correction quadripolar field is produced. The correction current generator includes passive elements, namely impedances, diodes and transistors operating as switches. The deflection coil halves are toroidally wound on the core.，下面是Colour television display apparatus provided with a cathode-ray tube专利的具体信息内容。

权利要求

1. A circuit for a system of deflection coils comprising a magnetic core, first and second deflection units, each unit comprising two coil halves toroidally wound on said core, said circuit comprising a pair of deflection current generator means for generating two substantially linear deflection currents, means coupling said generator means to said units respectively; and means for correcting isotropic astigmatism comprising means for generating a quadripolar field having an intensity that is substantially a square function of one of the deflection currents, said quadripolar generating means comprising a passive element correction current generator means, and means for coupling said passive correction means to at least one deflection coil unit for providing a correction current through the halves thereof.

2. A circuit as claimed in claim 1 wherein one of said units comprises a horizontal deflection unit, said correction generator means comprising a pair of equal inductance saturable coils having magnetic fields of opposite directions in the absence of the horizontal deflection current, said saturable coils being series coupled to said horizontal coil halves respectively whereby series circuits are formed, said series circuits being parallel coupled together.

3. A circuit as claimed in claim 1 wherein said correction generator means comprises a pair of unidirectional conducting elements series coupled to said halves of one of said units respectively, whereby two series circuits and a pair of junctions between said elements and halves are formed respectively, said series circuits being parallel coupled together, said elements having opposite conductivity directions, and an impedance means coupled between said junctions.

4. A circuit as claimed in claim 1 wherein at least two of said halves are series coupled together, whereby a series arrangement having a junction is formed, and said correction generator means comprises a winding coupled to said series arrangement and having a pair of taps symmetrical relative to the center of said winding, a pair of series circuits each comprising of a unidirectional conducting element and an impedance means series coupled thereto, said series circuits being coupled between said junction and said taps respectively.

5. A circuit as claimed in claim 4 wherein each of said elements comprises an adjustable conducting period transistor.

6. A circuit as claimed in claim 3 wherein each of said elements comprises an adjustable conducting period transistor.

7. A circuit as claimed in claim 4 wherein each of said coil halves have resistance and reactance and said impedance means comprises an inductor having resistance and reactance in a ratio substantially equal to the corresponding ratio in said halves.

8. A circuit as claimed in claim 3 wherein each of said coil halves having resistance and reactance and said impedance means comprises an inductor having resistance and reactance in a ratio substantially equal to the corresponding ratio in said halves.

9. A circuit as claimed in claim 1 further comprising said deflection units.

10. A circuit as claimed in claim 9 wherein said coil halves are symmetrical.

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Colour television display apparatus provided with a cathode-ray tube

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