JPH0677441B2 - Deflection yoke - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a deflection yoke mounted on a television receiver, a CRT display device, or the like, in which unnecessary radiation is reduced.

[Problems to be Solved by the Invention]

All of the above deflection yokes configured to reduce unnecessary radiation have strong coupling between the core and the coil that generate the magnetic field that cancels the leakage magnetic field. Is significantly worse. Further, these auxiliary coils for magnetic field generation are expensive because they are formed as separate windings from the horizontal deflection coil, and the assembling work is complicated. The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide an inexpensive deflection yoke that can efficiently reduce unnecessary radiation without deteriorating the characteristics of the deflection yoke.

[Means for Solving the Problems]

The present invention is provided with a part of a conductor wire forming a horizontal deflection coil on the funnel side of a pair of Kura type horizontal deflection coils constituting the deflection yoke mounted on the CRT, and / or outside the crossover portion on the electron gun side. By providing a loop having a predetermined number of turns formed while winding the horizontal deflection coil and having a winding direction opposite to that of the winding of the crossover portion, the deflection magnetic field generated by the horizontal deflection coil is reversed. A magnetic field directed in this direction is generated from this loop to reduce unnecessary radiation.

[Action]

Unwanted radiation from the horizontal deflection coil is canceled by a magnetic field in a direction opposite to the horizontal deflection magnetic field generated from a loop provided outside a part of the crossover wire portion of the conductor forming the horizontal deflection coil.

〔Example〕

1 to 3 show an embodiment of the present invention,
FIG. 1 is a configuration diagram when the deflection yoke is viewed from the funnel side, FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG. 1, and FIG. 3 is a diagram for explaining a winding configuration of a horizontal deflection coil and a loop. Is. In the figure, 1 is a horizontal deflection coil, 2 is a loop, 3 is a leakage magnetic field, 4 is a magnetic field generated by the loop, and 5 is a magnetic field.
Is a crossover part of the horizontal deflection coil on the funnel side. The loop 2, which is a feature of the present invention, is formed of a conductive wire that is continuous with the conductive wire that constitutes the horizontal deflection coil 1, and is wound a predetermined number of times in the winding direction shown in FIG. It is constructed by being wound in the opposite direction to the winding direction. The loop 2 thus formed generates a magnetic field 4 in the direction shown by the broken line in FIG. A leakage magnetic field 3 in the direction shown by the solid line in FIG. 2 is generated from the horizontal deflection coil 1. Therefore, the magnetic field 4 of the loop 2 acts to cancel the leakage magnetic field 3 from the horizontal deflection coil 1. Here, the configuration of the loop 2 is determined from the correlation with the number of turns of the horizontal deflection coil 1 and the like, and is constituted by approximately 10 to 20% of the number of turns of the horizontal deflection coil. The loop 2 may be formed by winding one turn of the horizontal deflection coil 1 for each turn, or may be formed by winding a predetermined number of loops at the beginning or end of the horizontal deflection coil 1. it can. One loop for each turn of the horizontal deflection coil
In the case of the horizontal deflection coil 1 having a turn, the heat inside the horizontal deflection coil 1 passes through the conductor wire of each winding turn to form a loop 2
Since it is cooled by, there is an advantage that the cooling effect is improved. Although the above description is for the case where the loop 2 is formed only on the crossover portion on the funnel side, the loop 2 is on the electron gun side,
Alternatively, the same operation and effect are provided in the case of being provided on both the funnel side and the electron gun side (FIG. 4), and description thereof will be omitted to avoid duplication. Although the horizontal deflection coil in the embodiment has been described as a general Kura type coil,
The present invention can be carried out in exactly the same manner even in the case of so-called slit winding in which a bobbin is provided with a groove and is wound, and has the same operation and effect.

〔The invention's effect〕

According to the present invention, the loop for generating a magnetic field in the direction opposite to the direction of the horizontal deflection magnetic field generated by the horizontal deflection coil is provided outside the connecting wire portion of the horizontal deflection coil, so that the distance between the loop and the core is large and the loop Since the coupling between the core and the core becomes relatively weak, the magnetic field generated by the loop can reduce the unwanted radiation level from the deflection yoke with almost no effect on the magnetic field that contributes to the deflection in the deflection yoke. Become. Also, the loop according to the present invention is inexpensive as it is simultaneously wound as part of the horizontal deflection coil. Further, there is an effect that the heat inside the horizontal deflection coil can be radiated by this loop.

[Brief description of drawings]

FIG. 1 is a view of a deflection yoke as seen from the funnel side according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1, and FIG. 3 is a winding of a horizontal deflection coil and a loop. FIG. 4 is a diagram for explaining a line, FIG. 4 is a diagram showing another embodiment of the present invention, and FIG. 5 is a diagram showing a conventional example. 1: Horizontal deflection coil, 2: Loop, 3: Leakage magnetic field, 4: Loop magnetic field, 5, 5 ': Crossover part

Claims (1)

[Claims] 1. A deflection yoke using a Kura-type coil for the horizontal deflection coil, wherein the Kura-type horizontal deflection coil is formed outside the crossover part on the funnel side and / or the electron gun side of the Kura-type horizontal deflection coil. A loop consisting of a part of a conducting wire, which is wound a predetermined number of times in a direction opposite to the winding direction of the connecting wire portion while winding the horizontal deflection coil, is provided with a magnetic field in a direction opposite to the magnetic field contributing to the deflection from the loop. A deflection yoke characterized by being generated.