JPH0479135A - Deflection yoke - Google Patents

Abstract

PURPOSE:To correct miss-convergence without degrading focusing property by connecting a first and a second sub-coils in series with each of deflection coils connected in parallel and applying magnetic bias to a U-shaped magnetic body on which the sub-coils are wound by a magnet. CONSTITUTION:Current running in a deflection coil is adjusted by adjusting the inductance of a first and a second sub-coils 2, 3 connected directly with a coil in the upper side and a coil in the lower side, respectively, by a rotary magnet 1. In this case the first and the second sub-coils are wound on each legs of a U-shaped magnetic body 4 and each leg is magnetically biased by the magnet 1 and in the case that the inductance of the first sub-coil 2 increases, the inductance of the second sub-coil 3 is decreased. As a result, in miss- convergence a cathode-ray tube shows, color disparity, so-called bow-shaped miss-convergence, is lowers easily without degrading the focusing property.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deflection yoke installed in a cathode ray tube of a television receiver or the like.

Conventional technology In recent years, the high resolution of color television receivers has been increasing.
Beam diameter of lHfi ray tube, misconvergence, etc.
Improvements in performance that affect resolution are becoming more desirable. Generally speaking, this misconvergence is
This is the misconvergence caused by the left and right imbalance of the horizontal deflection coil and the rotation of the electron gun of the cathode ray tube.
There are several types of pageants shown in the figure.

In order to correct this without using a convergence yoke, a four-pole ring-shaped magnet 8 called a gun rotary magnet shown in FIG. 9 is used for boat fishing.

As shown in FIG. 10, this is installed between the neck tightening band 9 of the deflection yoke and the horizontal deflection coil 10.
A method for correcting the above-mentioned pageant will be explained.

FIG. 11 is generally referred to as a positive direction misconception, and the example in this pattern diagram is a case where the blue beam has an upward arch shape.

In this example, as shown in FIG. 12, the red and blue beams are adjusted using the gun rotor 8 so that they coincide at the edge of the screen. However, in this state, there is a vertical shift in the red and blue colors at the center of the screen as shown in the pattern diagram in Figure 12, so a beam bender 4 with a function to align the center of the screen in advance is used. Adjust the vertical shift in the center of the screen using a polar ring magnet (not shown).

FIG. 13 is a pattern diagram showing a state in which the adjustment is completed.

Problems to be Solved by the Invention However, this method requires the use of a four-pole ring magnet for a beam bender when rotation of the electron gun occurs in the cathode ray tube. However, Konohimhender 4
Since the polar ring magnet is located near the electron gun, it acts when the speed of the electron beam emitted from the electron gun is slow. As a result, the electron beam is affected over a long period of time, which increases the beam diameter and worsens the focus of the electron beam.

The present invention takes the above-mentioned problems into consideration and attempts to provide a deflection yoke that improves the function of correcting misconvergence without deteriorating focus.

Means for Solving the Problems In order to achieve the above object, each of the deflection coils connected in parallel is provided with a first coil. A second subcoil is connected in series, and a magnet applies a magnetic bias to a U-shaped magnetic body wound around the second subcoil. As a result, the deflection yoke is configured such that the deflection current flowing through each of the deflection coils connected in parallel can be increased or decreased in the opposite direction depending on the direction in which the deflection current flows by controlling the magnet.

Effect: The deflection yoke of the present invention having the above-mentioned configuration has two deflection coils connected in series, one for each deflection coil connected in parallel, and one for each deflection coil connected in parallel. Since the second sub-coil is connected, this first sub-coil. By changing the inductance of the second subcoil, the deflection current can be controlled. Further, a 1.12th subcoil is wound around each leg of a magnetic body configured in a U-shape, and each leg is magnetically biased in the opposite direction by a magnet,
If the inductance of the first subcoil increases,
This is an operation in which the inductance of the second subcoil decreases. Further, depending on the direction in which the deflection current flows, the magnetic bias of the magnet to the first subcoil becomes a forward bias or acts as a reverse bias, so that the increase and decrease in inductance is reversed in the direction of the deflection current.

Therefore, the distribution of the magnetic field generated by the deflection coil changes depending on the direction of the deflection current, resulting in a converse sense function.

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a subcoil structure used in a deflection yoke according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a wiring state of the deflection yoke according to an embodiment of the present invention. As a component, 1 is a disc-shaped rotating magnet, 2.3 is a subcoil (first and second subcoil), and this is a ferrite core (
) is the magnetic core. Reference numeral 4 denotes a magnetic body for forming a magnetic circuit, which together with the aforementioned ferrite core constitutes a U-shaped magnetic body. Reference numeral 5 denotes a handle, and the handle 5 and the disc-shaped rotating magnet 1 are directly connected, and by turning the handle 5, the disc-shaped rotating magnet 1 is rotated.

Further, 6 is an upper saddle-shaped coil, 7 is a lower saddle-shaped coil, and both 6 and 7 are horizontal deflection coils.

1.2.3 are the same parts as in FIG.

The mutual relationship and operation of the constituent elements will be explained below in comparison with the display screen of a cathode ray tube.

Assume that the type of pageant shown in FIG. 11 is displayed. The magnetic field produced by any type of miscon in Fig. 11 must always be subjected to the force shown in Fig. 3, whether in the red or blue beam, or in the right or left half of the scan.

Next, the right half and left half of scanning will be explained separately.

FIG. 4 shows the left half of the scan. In order to generate any type of misconception shown in FIG. 11, the force shown in the figure must be applied to the red and blue beams, and the lines of magnetic force at this time are in the direction shown by the broken line. In order to generate such magnetic lines of force, the magnetic field of the lower coil must be strong, but in order to achieve this, the inductance of the subcoil connected in series with the upper saddle-shaped coil shown in Figure 5 must be increased. It is preferable to reduce the inductance of the subcoil 3 connected to the lower saddle-shaped coil 7.

In other words, in the magnetic circuit of the magnetic body around which both subcoils are wound, if the direction of the magnetic lines of force generated by the rotating magnet is reversed to the direction of the lines of magnetic force generated by the deflection current flowing in the upper subcoil 2, it will be in the direction that cancels the biased magnetization of the magnetic body. Yes, it increases the inductance and meets the purpose.

This is the explanation of the left half of scanning.

Next, I would like to explain the right half of scanning, or in this case it is completely opposite to the explanation for the left half.The conclusion is that in order to increase the deflection current flowing through the upper saddle-shaped coil, it is directly connected to the upper coil 6. It is better to reduce the inductance of the subcoil 2. That is, the direction of the magnetic lines of force generated by the subcoil 2 directly connected to the upper coil 6,
When the lines of magnetic force generated by a rotating magnet are aligned,
This is the direction in which the magnetic material is further polarized and saturated, and the inductance may be reduced to meet the purpose.

In this way, the subcoil directly connected to the upper coil is
Since it is wound around a magnetic material polarized by a magnet, depending on the direction of the deflection current flowing there, the inductance increases or decreases, and this creates the desired converging deflection magnetic field. It will work.

Combining the above left half and right half scans, the 11th
What types of misconceptions in the figure can be reduced.

The deflection current variable device of this embodiment has the above-described configuration, so that it applies a certain magnetic field when the electron beam speed is slow, like a conventional gun rotary magnet, and thereby prevents deterioration of focus. without letting
The magnetic field of the deflection coil can reduce any type of misconception.

It should be noted that although the explanation has been made using a saddle-shaped horizontal coil, there are differences in effectiveness, but it goes without saying that the effect can be obtained by applying either a toroidal type or a vertical coil.

Effects of the Invention As has been made clear from the above explanation, the deflection yoke of the present invention controls the magnitude of the current flowing through the deflection coils by controlling the magnitude of the current flowing through the deflection coils through the first and second coils, which are directly connected to each of the upper and lower coils. By adjusting the inductance of the second sub-coil with a rotating magnet, the color shift called "what type miscon" in the miscon display displayed by a cathode ray tube can be easily reduced without deteriorating the focus.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the external appearance of a subcoil structure used in a deflection yoke according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the wiring state of the deflection yoke of the same embodiment, and FIG. A pattern diagram to explain the force exerted by the electron beam that causes misconception. Figure 4 is a magnetic field distribution diagram due to the deflection coil during left half scanning. Figure 5 is a circuit diagram showing the subcoil current during left half scanning. Figure 6 is a magnetic field distribution diagram due to the deflection coil during right half scanning, Figure 7 is a circuit diagram showing the sub-coil current during right half scanning, Figure 8 is a pattern diagram showing a conventional one-boat fishing bow type pageant, Figure 9 is a perspective view of a conventional gun rotor magnet, Figure 10 is a side view of the gun rotor magnet attached to a deflection yoke, and Figure 11 is a perspective view of a conventional gun rotor magnet.
Figures 1 to 13 are diagrams for explaining how to reduce misconceptions using gun rotation magnets. 1...Disc-shaped rotating magneto soto, 2...
- Subcoil (first subcoil), 3... Subcoil (second subcoil), 4... Magnetic material, 6... Upper saddle-shaped coil, 7... ...Lower saddle-shaped coil. Agent's name Patent attorney Shigetaka Awano Subcoil (1f) + j subcoil) upper value 1j large-type coil 1111 flff-type coil te>noS Fig. Fig. -11 Fig. 72 Fig. 13 Fig. Ali center part

Claims (2)

[Claims] (1) A deflection coil consisting of two sets of coils connected in parallel to generate a deflection magnetic field for deflecting the electron beam of the cathode ray tube, and a first deflection coil connected in series to each of the two sets of coils.
, a second sub-coil, a U-shaped magnetic body in which each of the first and second sub-coils is wound around a separate leg, and an open end surface of the U-shaped magnetic body. and a magnet provided in contact with two of the deflection coils.
A deflection yoke in which sets of coils are arranged vertically or horizontally, and the inductances of the first and second sub-coils are increased and decreased in opposite directions by controlling the magnet. (2) The deflection yoke according to claim 1, wherein the U-shaped magnetic body around which the deflection coil and the first and second sub-coils are wound and a magnet attached is held by the same structure.