Claims
- 1. A deflection yoke apparatus for a cathode ray display tube having a screen-supporting portion, a neck portion within which at least one electron beam is produced, and an intermediate portion onto which the apparatus is to be mounted, said apparatus comprising:
- a. deflection means comprising:
- i. a pair of horizontal deflection coils for producing a first magnetic field for deflecting the at least one electron beam in a horizontal direction;
- ii. a pair of vertical deflection coils for producing a second magnetic field for deflecting the at least one electron beam in a vertical direction; and
- iii. an electrically insulating coil separator disposed between said pairs of deflection coils;
- b. a funnel-shaped deflection core of magnetically-permeable material having a central longitudinal axis and being arranged proximately around the deflection means for providing a path for flux in the first and second magnetic fields, said magnetic fields also including flux inside the deflection core for effecting the deflection of the at least one electron beam and including leakage flux outside the deflection core; and
- c. magnetic-field-influencing means comprising:
- i. a pair of diametrically-opposed rods of magnetically-permeable material having respective central longitudinal axes lying substantially in a vertical plane which substantially bisects the deflection core, each of said rods being disposed outside of said core, extending along substantially the entire axial length of said deflection core, and having a first end magnetically coupled through a closed magnetic path to a smaller end of said deflection core; and
- ii. a pair of auxiliary coils, each disposed about a respective one of the diametrically-opposed rods such that said coil is wound around the respective central longitudinal axis of said rod;
- said magnetic-field-influencing means, upon the supply of a horizontal deflection current to the auxiliary coils, producing a magnetic field for opposing at least a portion of the leakage flux of the first magnetic field.
- 2. A deflection yoke apparatus for a cathode ray display tube having a screen-supporting portion, a neck portion within which at least one electron beam is produced, and an intermediate portion onto which the apparatus is to be mounted, said apparatus comprising:
- a. deflection means comprising:
- i. a pair of horizontal deflection coils for producing a first magnetic field for deflecting the at least one electron beam in a horizontal direction;
- ii. a pair of vertical deflection coils for producing a second magnetic field for deflecting the at least one electron beam in a vertical direction; and
- iii. an electrically insulating coil separator disposed between said pairs of deflection coils;
- b. a funnel-shaped deflection core of magnetically-permeable material having a central longitudinal axis and being arranged around the deflection means for providing a path for flux in the first and second magnetic fields, said magnetic fields also including flux inside the deflection core for effecting the deflection of the at least one electron beam and including leakage flux outside the deflection core; and
- c. magnetic-field-influencing means comprising:
- i. a pair of diametrically-opposed rods of magnetically-permeable material having respective central longitudinal axes, each of said rods being vertically arranged outside of said core at an angle with respect to said axis, extending along a substantial axial length of said deflection core, and having a first end proximate to and closely magnetically coupled to a smaller end of said deflection core; and
- ii. a pair of auxiliary coils, each disposed about a respective one of the diametrically-opposed rods such that said coil is wound around the respective central longitudinal axis of said rod;
- said magnetic-field-influencing means, upon the supply of a horizontal deflection current to the auxiliary coils, producing a magnetic field for opposing at least a portion of the leakage flux of the first magnetic field.
- 3. An apparatus as in claim 1 or 2 including engaging means for supporting the rods such that the first end of each of said rods contacts the smaller end of the deflection core.
- 4. An apparatus as in claim 3 where the engaging means comprises an annular member surrounding the deflection core and means for supporting each of the rods at an inclination relative to the longitudinal axis of said core.
- 5. An apparatus as in claim 4 where the engaging means further comprises connection means for attaching said engaging means to the coil separator.
- 6. An apparatus as in claim 1 or 2 where at least the vertical deflection coils are of the saddle type.
- 7. A deflection yoke apparatus for a cathode ray display tube having a screen-supporting portion, a neck portion within which at least one electron beam is produced, and an intermediate portion onto which the apparatus is to be mounted, said apparatus comprising:
- a. deflection means comprising:
- i. a pair of horizontal deflection coils for producing a first magnetic field for deflecting the at least one electron beam in a horizontal direction;
- ii. a pair of vertical deflection coils for producing a second magnetic field for deflecting the at least one electron beam in a vertical direction; and
- iii. an electrically insulating coil separator disposed between said pairs of deflection coils;
- b. a deflection core of magnetically-permeable material having a central longitudinal axis, having first and second ends which are, respectively, closer to and further from the neck portion, and being arranged around the deflection means for providing a path for flux in the first and second magnetic fields, said magnetic fields also including flux inside the deflection core for effecting the deflection of the at least one electron beam and including leakage flux outside the deflection core; and
- c. magnetic-field-influencing means comprising:
- i. first and second elongated rods of magnetically-permeable material disposed, respectively, above and below the deflection core, said rods having respective central longitudinal axes, extending along substantially the entire axial length of said deflection core, and each having a first end magnetically coupled through a closed magnetic path to the first end of said deflection core; and
- ii. a pair of auxiliary coils, each disposed about a respective one of the rods such that said coil is wound around the respective central longitudinal axis of said rod;
- said magnetic-field-influencing means, upon the supply of a horizontal deflection current to the auxiliary coils, producing a magnetic field for opposing at least a portion of the leakage flux of the first magnetic field.
- 8. An apparatus as in claim 1, 2, or 7 where the rods diverge from each other with distance from the respective first ends of said rods.
- 9. An apparatus as in claim 1, 2 or 7 where each of the auxiliary coils is wound around a central axis which is substantially coincident with the central longitudinal axis of the respective rod around which said coil is disposed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
91202801 |
Oct 1991 |
EPX |
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Parent Case Info
This is a continuation of prior application Ser. No. 07/964,796, filed on Oct. 22, 1992 is now abandoned.
US Referenced Citations (9)
Continuations (1)
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Number |
Date |
Country |
Parent |
964796 |
Oct 1992 |
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