JPH01115038A - Deflection yoke - Google Patents

Abstract

PURPOSE:To enable the correction of mis-convergence dispersion due to the combination of a color picture tube and a deflecting yoke by fitting variable resistances in parallel to coils in a coma free deflecting yoke. CONSTITUTION:An E-shape magnetic material is so placed as to oppose a horizontal direction and auxiliary coils 2, 2' and 3 are wound around the center part of the E-shape magnetic material and both ends thereof. The auxiliary coils 2, 2' and 3 are connected in series to a vertical coil 1 so as to generate a 6-pole magnetic force line when an image plane is deflected upward. A variable resistance 6 is connected in parallel to the lower auxiliary coil 2', and another variable resistance 7 is connected in parallel to the auxiliary coils 2, 2 ' and 3. Also, another variable resistance 5 may be connected in parallel to the upper auxiliary coil 2. If a mis-convergence pattern occurs on the image plane, a current flow to the vertical auxiliary coil 2' is reduced and the force 4' of the magnetic force line due to the auxiliary coils 2, 2' and 3 is reduced respectively by increasing the resistance values of the variable resistances. As a result, vertical line cross mis-convergence is corrected.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a deflection yoke for color televisions or color display cathode ray tubes. The present invention relates to a deflection yoke having means suitable for convergence correction.

[Conventional technology]

In the conventional device, as described in Utility Model Application No. 152205/1980, a pair of E-shaped magnetic materials are arranged behind the electron gun side, six coils are arranged on the E-shaped magnetic materials, and the coils are perpendicular to the coils. This method corrects misconvergence called coma aberration by flowing a deflection current and forming a six-pole magnetic field, but CP'I' (
Correction of variations in misconvergence due to the combination of a color picture tube) and a deflection yoke was not considered.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the CPT electron gun structure, variations in electron gun mounting, horizontal and vertical coil winding distribution of the deflection yoke, and variations in the assembly of the deflection yoke. It was difficult to obtain high-quality miscomparison in

An object of the present invention is to provide a coma-free deflection yoke equipped with means for correcting variations in misconvergence due to the combination of CPT/DY (deflection yoke).

[Means for solving problems]

The above purpose is to arrange a pair of E-shaped magnetic materials facing each other in the horizontal direction at the rear of the electron gun, and provide an auxiliary coil for the vertical deflection coil at the center and both ends of the E-shaped magnetic material. A vertical deflection current is applied to form a six-pole magnetic field to
In the deflection yoke that corrects the lower coma aberration, connect a variable resistor in parallel to the upper or lower coils at both ends to unbalance the current flowing to the upper/lower coils.This occurs when a PT/DY combination is used. Vertical line cross misconvergence that may occur can be corrected.

[Operation] Since the auxiliary coils at both ends and the center are connected in series, if the variable resistor is not connected, the same amount of vertical deflection current flows through the upper and lower coils at both ends. However, if cross misconvergence between the red beam and the blue beam occurs on the CPT screen as shown in Fig. 5 in a vertical line, by decreasing the resistance value of the variable resistor 6 as shown in Fig. 5, The current flowing through the coil is smaller than the upper coil)
The misconvergence shown in FIG. 5 is corrected to become the optimal misconvergence as shown in FIG. 6.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a deflection yoke as an embodiment of the present invention, in which auxiliary coils 2, 2.3 for coma aberration correction are installed, and a variable resistor is attached in parallel to the lower auxiliary coil 2'. FIG. 2 is a front view of the same main part.

In these figures, the correction auxiliary coil is placed behind the horizontal deflection coil on the electron gun side, and the auxiliary coil 2.
The cross-sectional views of 2' and 3 and the hexapole magnetic field line distribution when deflected toward the top of the screen are as shown in FIG. E-shaped magnetic members are arranged to face each other in the horizontal direction, and auxiliary coils 2, 2', and 3 are wound around the center and both ends of the E-shaped magnetic members. For example, when the auxiliary coil is deflected toward the top of the screen, it is connected in series to the vertical coil 1 to generate six-pole lines of magnetic force as shown in FIG. 2, and a variable resistor 6 is connected in parallel to the lower auxiliary coil 2. Also, auxiliary coils 2, 5, 2'
A variable resistor 7 is connected in parallel with the circuit.The wiring diagram is shown in FIG. Variable resistor 5 in parallel with father side auxiliary coil 2
An example is shown in FIG. 4.

For example, if a misconvergence pattern occurs on the CPT screen as shown in Figure 5, if the resistance value of the variable resistor 6 is increased in Figure 3, the current flowing through the vertical auxiliary coil 2' will be reduced, and the magnetic field lines due to the auxiliary coil will be strength 4'
Vertical line cross misconvergence, where the blue beam (B) is on the left and the red beam (R) is on the right at the top of the screen as shown in Figure 5, and vice versa at the bottom, can be easily corrected. It will look like Figure 6.

〔Effect of the invention〕

According to the present invention, in a coma-free deflection yoke that generates a white-pole magnetic field using six coils, two of the six coils
By attaching a variable resistor in parallel to the 9CPT, it is possible to easily correct vertical line cross misconvergence caused by a combination error between the 9CPT and the deflection yoke, and provides a deflection yoke that is practically effective for obtaining images with good convergence quality. can.

[Brief explanation of the drawing]

Fig. 1 is a side view of a deflection yoke as an embodiment of the present invention, Fig. 2 is a front view showing an E-shaped magnetic body and an auxiliary coil wound thereon, and Figs. A wiring diagram of an embodiment of the invention, FIG. 5 is an explanatory diagram showing an example of a vertical line misconvergence pattern that occurs when CP'I' and DY are combined, and FIG. 6 is a diagram showing a misconvergence pattern after correction according to the invention. It is an explanatory diagram showing a pattern. 1... Vertical coil, 2... Upper auxiliary coil, 2...
・Lower auxiliary coil, 3...Center auxiliary coil, 4...
・Upper magnetic field line, 4'...Lower magnetic field line, 5, 6.7...
・Variable resistance, horse

Claims (1)

[Scope of Claims] 1. Consisting of a pair of E-shaped magnetic bodies arranged opposite to each other in the horizontal direction at the rear of the electron gun side of the horizontal deflection coil of a color cathode ray tube having multiple electron guns arranged in-line; A deflection system in which auxiliary coils for vertical deflection coils are provided at both ends and the center of the magnetic body, and a vertical deflection current is passed through the auxiliary coils to form a six-pole magnetic field to correct coma aberration at the top/bottom of the screen. In the yoke, a variable resistor is connected in parallel to the upper or lower coils at both ends, and the resistor is adjusted to unbalance the current flowing through the upper/lower coils, thereby eliminating the vertical line cross misconvergence that occurs on the screen. A deflection yoke characterized by correcting.