Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
1996-07-23
2001-03-13
Blum, Theodore M. (Department: 3642)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
Reexamination Certificate
active
06201360
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a deflection yoke and a cathode-ray tube device for use as a computer display unit, for example.
Heretofore, efforts have been made to reduce image distortions and misconvergence in cathode-ray tube devices for use as computer display units or the like by adjusting the winding distribution of deflection coils and correcting deflecting magnetic fields with an auxiliary coil.
Specifically, it is possible to reduce image distortions and misconvergence in a cathode-ray tube device simply by adjusting the field distributions of deflecting magnetic fields in order to produce different field distributions of horizontal and vertical deflecting magnetic fields at screen and neck regions of the cathode-ray tube device (see Japanese Patent Laid-open Nos. Hei 4-65489, Hei 4-39649, and Hei 5-39895).
If the field distributions of horizontal and vertical deflecting magnetic fields differ from each other at screen and neck regions of a cathode-ray tube device, however, a reversed pattern of misconvergence is produced on the display screen as shown in
FIG. 1
of the accompanying drawings. In
FIG. 1
, “XH” represents an amount of misconvergence produced on a central line in left and right end areas of the display screen, “XH′” represents an amount of misconvergence produced in areas between the left and right end areas and the center of the display screen, and “S1”, PQV represent amounts of misconvergence produced in upper and lower areas above and below the areas where the amounts of misconvergence “XH”, “XH′” are measured.
In the upper and lower areas, red and blue patterns are vertically reversed as they go from the center of the display screen toward the left and right end areas thereof. Because of the reversed red and blue patterns, if misconvergence is reduced in some area of the display screen by changing the deflecting magnetic fields, then misconvergence is increased in another area of the display screen. For correcting the misconvergence by changing the deflecting magnetic fields, however, it is difficult to set the winding distributions of deflection coils to optimum values and also to adjust the deflection yoke.
To alleviate such a drawback, it has been customary for related art cathode-ray tube devices to incorporate an auxiliary coil in the deflection yoke near the electron guns. The auxiliary coil is energized by a horizontal deflecting current or a current from an external power supply. Alternatively, the auxiliary coil consists of a saturable reactor, and is modulated by a vertical deflecting current and energized by a horizontal deflecting current. The auxiliary coil is thus energized to correct the misconvergence which cannot fully be removed by the deflection yoke itself (see Japanese Patent Laid-open Nos. Sho 60-158534, Hei 5-1890, and Hei 5-15715).
However, use of the auxiliary coil separately mounted on the neck of the cathode-ray tube for convergence correction results in an increased number of parts of the cathode-ray tube device, which is therefore relatively complex in structure.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a deflection yoke and a cathode-ray tube device which are capable of correcting convergence easily with a simple structure.
According to the present invention, there is provided a deflection yoke comprising a horizontal deflection coil, and a saturable reactor connected to the horizontal deflection coil, the saturable reactor having an inductance variable depending on a horizontal deflecting current flowing through the horizontal deflection coil or a vertical deflecting current supplied to the deflection yoke for varying a field distribution of a deflecting magnetic field produced by the horizontal deflection coil depending on the horizontal deflecting current or the vertical deflecting current.
According to the present invention, there is also provided a deflection yoke comprising a horizontal deflection coil comprising a plurality of deflection coil segments, and a saturable reactor connected to at least one of the deflection coil segments, the saturable reactor having an inductance variable depending on a horizontal deflecting current flowing through the horizontal deflection coil or a vertical deflecting current supplied to the deflection yoke for varying a ratio of currents flowing through the deflection coil segments depending on the horizontal deflecting current or the vertical deflecting current for thereby varying a field distribution of a deflecting magnetic field produced by the horizontal deflection coil depending on the horizontal deflecting current or the vertical deflecting current.
According to the present invention, there is also provided a deflection yoke comprising a pair of first and second horizontal deflection coils, the first horizontal deflection coil comprising a first pair of horizontal deflection coil segments connected parallel to each other, the second horizontal deflection coil comprising a second pair of horizontal deflection coil segments connected parallel to each other, the first pair of horizontal deflection coil segments being connected in series to the second pair of horizontal deflection coil segments, and a saturable reactor connected parallel to the first pair of horizontal deflection coil segments and connected in series to the second pair of horizontal deflection coil segments.
According to the present invention, there is also provided a deflection yoke comprising a pair of first and second horizontal deflection coils, the first horizontal deflection coil comprising a first pair of horizontal deflection coil segments connected parallel to each other, the second horizontal deflection coil comprising a second pair of horizontal deflection coil segments connected parallel to each other, the first pair of horizontal deflection coil segments being connected parallel to the second pair of horizontal deflection coil segments, and a saturable reactor connected in series to the first pair of horizontal deflection coil segments and connected parallel to the second pair of horizontal deflection coil segments.
According to the present invention, there is also provided a cathode-ray tube device comprising a deflection yoke comprising a horizontal deflection coil comprising a plurality of deflection coil segments, and a saturable reactor connected to at least one of the deflection coil segments, the saturable reactor having an inductance variable depending on a horizontal deflecting current flowing through the horizontal deflection coil or a vertical deflecting current supplied to the deflection yoke for varying a ratio of currents flowing through the deflection coil segments depending on the horizontal deflecting current or the vertical deflecting current for thereby varying a field distribution of a deflecting magnetic field produced by the horizontal deflection coil depending on the horizontal deflecting current or the vertical deflecting current.
According to the present invention, there is also provided a cathode-ray tube device comprising a deflection yoke comprising a pair of first and second horizontal deflection coils, the first horizontal deflection coil comprising a first pair of horizontal deflection coil segments connected parallel to each other, the second horizontal deflection coil comprising a second pair of horizontal deflection coil segments connected parallel to each other, the first pair of horizontal deflection coil segments being connected in series to the second pair of horizontal deflection coil segments, and a saturable reactor connected parallel to the first pair of horizontal deflection coil segments and connected in series to the second pair of horizontal deflection coil segments.
According to the present invention, there is also provided a cathode-ray tube device comprising a deflection yoke comprising a pair of first and second horizontal deflection coils, the first horizontal deflection coil comprising a first pair of horizontal deflection coil segments connected parallel to
Blum Theodore M.
Kananen Ronald P.
Sony Corporation
LandOfFree
Deflection yoke and cathode-ray tube device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Deflection yoke and cathode-ray tube device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deflection yoke and cathode-ray tube device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2475171