JP3525780B2 - Color picture tube equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube device used for a television, a computer display or the like.

[0002]

2. Description of the Related Art When a blue and red line is projected on the screen of a phosphor screen in a conventional color picture tube device equipped with an in-line electron gun, the distortion of the magnetic field distribution and the curved surface inside the panel are balanced to each other. Horizontal line misconvergence as shown in FIG. 9 occurs. That is, in the intermediate area occupying about one half of the vertical effective size of the phosphor screen surface,
Blue lines 1B and 3B in the first and third quadrants are red lines 1R,
3R upward, and blue line 2 in the 2nd and 4th quadrants
B and 4B are displaced diagonally downward from the red lines 2R and 4R, respectively.

It is generally known that the horizontal line misconvergence in the middle portion is corrected by the barrel magnetic field enhancement of the horizontal deflection magnetic field. Conventionally, in order to reduce the horizontal line misconvergence, a magnet is attached to the deflection yoke, and the barrel magnetic field of the horizontal deflection magnetic field is locally emphasized at the place where the correction sensitivity is the strongest. There has been a method of correcting convergence (Japanese Utility Model Laid-Open No. 63-80756).

[0004]

However, the correction using the conventional magnet as described above has an influence on the vertical line misconvergence on the horizontal axis, and the compromise design of the vertical line misconvergence and the horizontal line misconvergence. However, it did not improve the convergence quality of the entire screen.

The present invention has been made in view of the above circumstances, and provides a high-performance color picture tube capable of reducing horizontal line misconvergence in an intermediate region without deteriorating vertical line convergence. It is a thing.

[0006]

A color picture tube apparatus according to the present invention is a color picture tube apparatus having a deflection yoke in a color picture tube, wherein the deflection yoke produces a horizontal correction magnetic field which changes in synchronization with a vertical deflection cycle. and a correction coil for generating the left and right, the correction coil is unidirectional current flow
Always generates a horizontal correction magnetic field with a specific polarity,
The horizontal correction magnetic field emphasizes the barrel magnetic field of the left horizontal deflection magnetic field during left side horizontal deflection when viewed from the screen surface side of the color picture tube, and emphasizes the barrel magnetic field of the right horizontal deflection magnetic field during right side horizontal deflection. It is characterized (Claim 1). With this configuration, horizontal line misconvergence can be improved without deteriorating vertical line misconvergence.

The correction coil may be a solenoid coil, and the correction coils are arranged on the X-axis of the color picture tube one by one on the left and right sides and the longitudinal direction thereof is parallel to the Y-axis. Is preferred (claim 2). With this configuration, it is possible to easily generate a desired correction magnetic field.

Further, according to the first aspect of the invention, the correction coils are solenoid coils, and a total of four pairs are provided symmetrically with respect to the X-axis, one pair each on the left and right sides, and the longitudinal direction thereof is parallel to the Z-axis of the color picture tube. It is preferable that the pair of solenoid coils are arranged and have opposite polarities to generate a loop-shaped magnetic field (claim 3).
With this configuration, it is possible to easily generate a desired correction magnetic field.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the color picture tube device of the present invention, the color picture tube and the positional relationship between the color picture tube and the deflection yoke are the same as the conventional ones, and therefore the description thereof will be omitted, and only the deflection yoke will be described in detail.

(First Embodiment) FIG. 1 is a front view of a deflection yoke according to the first embodiment of the present invention, and FIG. 2 is a side view thereof. The deflection yoke includes a horizontal deflection coil 1, a vertical deflection coil 2, an insulating frame 3 for insulating and fixing them, and a ferrite core 4 provided outside the vertical deflection coil 2.

A correction coil composed of a pair of solenoid coils 5 and 6 is mounted in the vicinity of the screen-side opening of the insulating frame 3 so as to be bilaterally symmetrical when viewed from the screen side. The solenoid coils 5 and 6 are arranged around a ferrite core of a square pole having a length of 5 [mm], a width of 5 [mm] and a length of 20 [mm].
It is a 0.36 [mm] type 1 copper wire wound 20 times and is arranged substantially parallel to the Y axis of the color picture tube.

FIG. 3 shows a connection diagram of the vertical deflection coil 2 and the solenoid coils 5 and 6. The solenoid coil 5 on the left side and the solenoid coil 6 on the right side are connected in series, which is connected to a four-wave rectification circuit composed of diodes 7, 8, 9, and 10, and this circuit portion is connected in series to the vertical deflection coil 2. There is. When a current flows in this circuit in the positive direction of vertical deflection (upward deflection), the current flows through the diode 7, the solenoid coils 5, 6 and the diode 10 due to the diode rectifying action. On the other hand, when a current flows in the negative direction of the vertical deflection (downward deflection), the diode 8, the solenoid coils 5, 6 and the diode 9 similarly pass the current.

FIG. 4 shows a waveform A of the vertical deflection current and a waveform B of the current flowing through the solenoid coil in synchronization with this. The horizontal axis represents time and the vertical axis represents current value. Waveform A and Waveform B
As can be seen from the relationship with, the current flowing through the solenoid coil changes in proportion to the absolute value of the vertical deflection current. Further, as can be seen from the waveform B, a current in the positive direction always flows in the solenoid coil, and each solenoid coil generates a correction magnetic field having a specific polarity. As shown in FIG. 5, the polarities of the correction magnetic fields generated by the solenoid coils 5 and 6 are such that the solenoid coil 5 on the left side when viewed from the phosphor screen surface side has an upper S pole and a lower N pole.
The solenoid coil 6 on the right side is preset so that the upper side has the N pole and the lower side has the S pole. In this way, the above-mentioned circuit section makes the strength of the correction magnetic field in synchronization with vertical deflection,
The correction magnetic field with a specific polarity is always the solenoid coil 5,
It occurs from 6.

The principle of correcting the lateral misconvergence by this correction magnetic field will be described. As shown in FIG. 6, during leftward horizontal deflection, the horizontal deflection coil generates a pincushion type horizontal deflection magnetic field. On the other hand, the solenoid coil 5 on the left side generates a pincushion magnetic field having a polarity opposite to that of the horizontal deflection magnetic field generated by the horizontal deflection coil, so that it is equivalently a magnetic field that emphasizes the barrel magnetic field. Similarly, during right side horizontal deflection, the horizontal deflection coil generates a pincushion type horizontal deflection magnetic field, whereas the right solenoid coil 6 has a polarity opposite to that of the horizontal deflection magnetic field generated by the horizontal deflection coil. Since the pincushion magnetic field is generated, the magnetic field equivalently emphasizes the barrel magnetic field.

By the way, generally, when the barrel magnetic field of the horizontal deflection magnetic field is emphasized, the vertical line convergence (hereinafter referred to as "XH") on the horizontal axis (X axis) is a so-called XH barrel pattern as shown in FIG. Becomes That is, misconvergence occurs in which the B beam is located to the left at the end of the X axis with respect to the R beam. Conventionally, like the above-mentioned magnet mounting method, the horizontal magnetic field of the horizontal deflection magnetic field is emphasized to correct the horizontal transversal line misconvergence, but the occurrence of XH misconvergence is unavoidable and a compromise design must be made between the two. Didn't get However, in the present invention, since the magnetic field of the solenoid coil is not generated on the horizontal axis by the method of emphasizing the barrel magnetic field of the horizontal deflection magnetic field in synchronization with vertical deflection, there is no influence on XH, and horizontal line misconvergence correction in the middle part is eliminated. Sometimes the required correction field is obtained.

(Second Embodiment) FIG. 8 is a diagram schematically showing a deflection yoke and a correction coil according to a second embodiment of the present invention. As shown in FIG. 8, the correction coil according to the present embodiment has a total of 4 pairs of left and right pairs symmetrically with respect to the X axis.
The lengthwise direction of each is approximately parallel to the Z axis of the color picture tube,
Alternatively, they are arranged so as to be substantially parallel to the path of the electron beam. The solenoid coils 11 and 12 have opposite polarities and form a pair, and the solenoid coils 13 and 14 have opposite polarities and form a pair, and generate a loop-shaped magnetic field similar to that of the first embodiment. The symbols N and S in FIG. 8 indicate the polarities of the respective solenoid coils, and indicate that the illustrated polarities occur at one end portion on the phosphor screen surface side. The solenoid coil shown in FIG. 8 is merely a schematic one, and actually has the same shape as that of the first embodiment.

[0017]

As described above, according to the present invention,
It is possible to provide a high-performance color picture tube that can reduce horizontal line misconvergence in the intermediate region without deteriorating vertical line convergence.

[Brief description of drawings]

FIG. 1 is a front view of a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a side view of the deflection yoke according to the first embodiment of the present invention.

FIG. 3 is a connection diagram of a correction coil and a vertical deflection coil according to the present invention.

FIG. 4 is a waveform diagram of a current flowing through a vertical deflection coil and a correction coil according to the present invention.

FIG. 5 is a diagram showing a correction magnetic field generated by a correction coil according to the present invention.

FIG. 6 is a diagram showing a horizontal deflection magnetic field generated by a horizontal deflection coil.

FIG. 7 is a diagram showing an XH barrel pattern.

FIG. 8 is a diagram showing a deflection yoke according to a second embodiment of the present invention.

FIG. 9 is a diagram showing horizontal line misconvergence.

[Explanation of symbols]

1 Horizontal deflection coil 2 Vertical deflection coil 3 insulating frame 4 Ferrite core 5, 6 solenoid coil 11-14 Solenoid coil

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-7-296743 (JP, A) JP-A-2-33835 (JP, A) JP-A-4-73844 (JP, A) JP-A 61- 88429 (JP, A) Actual opening 2-136963 (JP, U) Actual opening Sho 62-135345 (JP, U) Actual opening Sho 62-41654 (JP, U) Actual opening Sho 63-80756 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 29/76

Claims (3)

(57) [Claims] 1. A color picture tube device having a deflection yoke in a color picture tube, wherein the deflection yoke is a water changing unit synchronized with a vertical deflection cycle.
A correction coil that generates a flat correction magnetic field is provided on the left and right .
A horizontal correction magnetic field having a polarity is generated. The horizontal correction magnetic field emphasizes the barrel magnetic field of the left horizontal deflection magnetic field during left side horizontal deflection when viewed from the screen surface side of the color picture tube, and the right horizontal deflection magnetic field during right side horizontal deflection. A color picture tube device characterized in that it emphasizes the barrel magnetic field of. 2. The correction coil is formed of a solenoid coil, and one coil is arranged on the X-axis of the color picture tube on the left and right sides, and the longitudinal direction thereof is arranged in parallel with the Y-axis.
The color picture tube device described in. 3. The correction coil is composed of a solenoid coil, and a total of four pairs are arranged symmetrically with respect to the X-axis, one pair each on the left and right sides, the longitudinal direction of which is arranged in parallel with the Z-axis of the color picture tube. 2. The color picture tube device according to claim 1, wherein said solenoid coil has a reverse polarity and generates a loop-shaped magnetic field.