JPH0244634A - Color image receiving tube - Google Patents

Abstract

PURPOSE:To correct misconvergence in the vertical and horizontal directions and reduce shape distortion of a beam spot by allowing only positive half cycle of vertical deflecting current to flow in a coil wound on No.1 channel-shaped core of a corrective mag. field generator, and by permitting only negative half cycle to flow in a coil wound on No.2 channel-shaped core. CONSTITUTION:A corrective mag. field generator consists of No.1 and No.2 channel-shaped core 15a, 15b and coils 16a, 16b wound on them. Half cycle component of the vertical deflection current flowing into a vertical deflection coil 18 from a vertical deflection output circuit 19 flows in the coil 16a while the remaining half cycle component in the other coil 16b. In the period the upper half of a fluorescent surface is scanned with electron beam, corrective mag. field in barrel tendency is generated only between the two legs of the lower core 15b, and a force F directed outward is applied to electron beams on the two sides. In the period the lower half of the fluorescent surface is scanned, on the other hand, vertical correction mag. field in barrel tendency is alike generated only between the two legs of the upper core 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color picture tube having an in-line electron gun, a deflection yoke attached to the picture tube, and a method for vertically correcting an electron beam emitted from the electron gun. The present invention relates to a color picture tube device including a correction magnetic field generator for applying a magnetic field.

BACKGROUND OF THE INVENTION Generally, a deflection yoke mounted on a color picture tube having an in-line electron gun is configured to generate a horizontal deflection field with a pincushion tendency and a vertical deflection field with a barrel tendency.

For this reason, it is possible to obtain a dynamic convergence effect without using a complicated convergence circuit, but when an electron beam is deflected by such a distorted deflection magnetic field, its cross-sectional shape is distorted and the fourth As shown in the figure, the blue (B), green (G), and red (R) beam spots generated on the phosphor screen are also distorted, making it difficult to obtain high resolution, especially in the periphery of the screen.

Therefore, while maintaining the overall distortion of the horizontal deflection magnetic field in a pincushion tendency and the overall distortion of the vertical deflection magnetic field in a barrel tendency, the electron gun side or phosphor screen side of the magnetic field is distorted in the opposite tendency. In this way, the beam spot distortion described above is reduced while obtaining a dynamic convergence effect. However, if the barrel tendency distortion of the vertical deflection magnetic field is insufficient, the blue (B) and red (R) vertical lines caused by the electron beams b and r on both sides will overlap at the top and bottom of the screen, as shown in Figure 5. Convergence occurs and color shift occurs.

In the invention disclosed in Japanese Patent Publication No. 60-19188, a correction magnetic field generator as shown in FIG. 6 is provided in the neck portion of a color picture tube having an in-line type electron gun. Here, the legs of the pair of U-shaped cores 1a, lb face each other in the vertical direction with the neck part in between, and the terminals 3, 4 of the coils 2a, 2b wound around each core are connected to the seventh Since it is connected to terminals 5 and 6 of the circuit shown in the figure, when a vertical deflection current flows from the vertical deflection output circuit 7 to the vertical deflection coil 8 and the resistor 9, it passes through the diode bridge circuit 10 connected in parallel to the resistor 9. A correction current flows through the coils 2a and 2b, and the three electron beams emitted from the electron gun and entering the deflection magnetic field are influenced by the correction magnetic field shown by arrows in FIG. That is, since the electron beams b and r on both sides are subjected to an outward force F, the misconvergence of the vertical lines shown in FIG. 5 can be corrected.

Problems to be Solved by the Invention The present invention provides a color picture tube device capable of not only correcting misconvergence of vertical lines as described above, but also correcting convergence coma for the center electron beam g and correcting coma aberration of the beam spot. It is something.

Means for Solving the Problems The present invention provides a color picture tube having an in-line electron gun in which three electron beam emission ports are arranged in one horizontal plane within the neck of the bulb, and a color picture tube mounted on the color picture tube. A color picture tube device comprising a deflection yoke that generates a horizontal deflection magnetic field distorted in a pincushion tendency and a vertical deflection magnetic field distorted in a barrel tendency, and a correction magnetic field generator,
The correction magnetic field generator is composed of first and second U-shaped cores and a coil wound around each core. Only the positive half-cycle component of the deflection current is passed through the coil wound around the second U-shaped core, and only the negative half-cycle component of the vertical deflection current is passed through the coil wound around the second U-shaped core. The first and second U-shaped cores are disposed such that their respective leg portions face each other in the vertical direction with the neck portion interposed therebetween.

Effect With this configuration, while the upper half of the phosphor screen is being scanned by the electron beam, a vertical correction magnetic field with a barrel tendency is generated only between the legs of the U-shaped core located at the bottom, and the phosphor screen is During the period when the lower half is scanned by the electron beam, a vertical correction magnetic field with a barrel tendency is generated only between the legs of the upper U-shaped core, so the electron beams on both sides receive an outward force. Therefore, the misconvergence of vertical lines as described above can be effectively corrected. Moreover, since a vertical force acts on the center electron beam, it is possible to correct misconvergence between the horizontal lines caused by the center electron beam and the horizontal lines formed by the electron beams on both sides. Furthermore, since the correction magnetic field acts to cancel out the so-called six components of the deflection magnetic field caused by the deflection yoke, it is also possible to correct distortion in the shape of the beam spot.

Embodiments Next, the present invention will be explained along with embodiments shown in the drawings.

As shown in FIG. 1, a color picture tube 12 equipped with a deflection yoke 11 has an electron gun 13 enclosed within the neck of its glass bulb.
A correction magnetic field generator 14 is disposed outside the neck portion between the two. However, the deflection yoke 10.1 has the function of generating a horizontal deflection magnetic field distorted in a pincushion tendency and a vertical deflection magnetic field distorted in a barrel tendency.
is an in-line type in which three electron beam emission ports are arranged in one horizontal plane. 15 indicates a vertical deflection system circuit.

As shown in FIG. 2, the correction magnetic field generator 14 includes first and second U-shaped cores 15a, 15b, and each core 15a.
, 15b are wound around coils 16a and 16b. However, the first and second U-shaped cores 15a,
The coils 15b are disposed such that their respective legs face each other in the vertical direction across the neck portion, and both coils 1
6a.

16b has a circuit configuration as shown in FIG. That is, both coils 16a and 16b are connected to the deflection yoke 1 through diodes 17a and 17b connected in series, respectively.
1, and both diodes 17a and 17b are connected in opposite polarity directions.

A half-cycle component of the vertical deflection current flowing from the vertical deflection output circuit 19 to the vertical deflection coil 18 flows to the coil 16a, and the remaining half-cycle component flows to the coil 16b.

During the period when the upper half of the phosphor screen is scanned by the electron beam, the second
As shown in the figure, a vertical correction magnetic field with a barrel tendency is generated only between the legs of the U-shaped core 15b located on the lower side, and an outward force F acts on the electron beams b and r on both sides. Further, during the period when the lower half of the phosphor screen is scanned by the electron beam, a barrel-like vertical correction magnetic field is generated only between the legs of the upper U-shaped core 15a, as described above. Therefore, the misconvergence of vertical lines as described above can be effectively corrected. Further, since a vertical force acts on the center electron beam, misconvergence (FIG. 5) between the horizontal line due to the center electron beam and the horizontal lines due to the electron beams on both sides can be corrected. Moreover, the correction magnetic field is applied to the deflection yoke 11
Since it acts in the direction of canceling out the so-called six components of the deflection magnetic field generated by the beam spot, shape distortion of the beam spot can also be corrected.

As described above, according to the present invention, with a relatively simple configuration, not only vertical and horizontal misconvergence can be reduced, but also shape distortion of the beam spot can be reduced, and high resolution can be achieved. A color picture tube device with less brownish shift can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a color picture tube device embodying the present invention, Fig. 2 is a diagram showing the relationship between the correction magnetic field generator of the same device and an electron beam, and Fig. 3 is a diagram showing the electric field of the correction magnetic field generator of the same device. Circuit diagram, Fig. 4 is a diagram to explain shape distortion of the beam spot due to deflection aberration, Fig. 5 is a diagram to explain misconvergence, and Figs. 6 and 7 are conventional correction magnetic field generators. FIG. 2 is a diagram showing the configuration and circuit of FIG. 11... Deflection yoke, 12... Color picture tube, 13... Electron gun, 14... Correction magnetic field generator, 15a. 15b...Core 16a, 16b...
・Coil, 17a, 17b...Diode, 1
8...Vertical deflection coil. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 11.-m York +2- Fuller 11 13-electron gun +4-? 1 positive magnetic field 11CI! :Kyo 15-tm Mukodakata Circuit Diagram Diagram Diagram Diagram Diagram GR

Claims (1)

[Claims] A color picture tube has an in-line electron gun with three electron beam emission ports arranged in a horizontal plane in the neck of the bulb, a horizontal deflection magnetic field and a barrel attached to the color picture tube and distorted into a pincushion tendency. It comprises a deflection yoke that generates a vertical deflection magnetic field with a tendency to be distorted, and a correction magnetic field generator, the correction magnetic field generator being wound with a coil that allows only the positive half-cycle component of the vertical deflection current to flow. a first U-shaped core, and a second U-shaped core through which only the negative half-cycle component of the vertical deflection current flows, each of both legs of the first and second U-shaped cores; The color picture tube device is characterized in that the two parts are vertically opposed to each other with the neck part in between.