KR0123345Y1 - Deflection yoke - Google Patents

Abstract

The present invention relates to a deflection yoke. The magnets are mounted on the deflection yoke's magnetic holder to prevent pincushion of the top, bottom, left and right, so that the magnetic flux density is large. A piece was installed to match the magnetic flux density of the magnet.

Therefore, this design has the advantage of effectively preventing the distortion and scattering of the upper and lower or left and right caused by the mismatch of magnetic flux density of the magnets.

Description

Deflection yoke

1 is a front view of the deflection yoke.

2 is a view showing a magnetic field and a deflection force of a deflection yoke with a conventional magnet.

3A to 3C are screen state diagrams before and after attaching the magnet of FIG. 1 and screen state diagrams due to inconsistency of magnetic magnetic flux densities.

4 (a), (b) is a view showing the magnetic field and the deflection force of the deflection yoke, the magnetic piece according to the present invention is attached to the magnet.

* Explanation of symbols for main parts of the drawings

DY: deflection yoke F: deflection force

VC: Vertical deflection coil-: Magnetic field

HC: Horizontal deflection coil 21,22: Magnetic piece

M: Magnet

The invention relates to a deflection yoke (DY) for correcting the pincushion of the cathode ray tube, and more particularly, a magnet mounted to the screen portion of the deflection yoke to prevent the cathode ray tube from being drawn into a pincushion shape. The invention relates to a deflection yoke capable of preventing the screen from being crushed up or down, left and right or scattering.

In general, a cathode ray tube (CRT) such as a TV receiver or a monitor is equipped with a deflection yoke for deflecting an electron beam emitted from an electron gun, and the electron beam is sequentially and sequentially scanned to pixels to form a screen.

However, as CRTs become more colorized, thinner, screens become larger, and planarized, and pixels become smaller, the deflection angle increases, and the importance of deflection yokes and deflection circuits for obtaining high resolution is increasing day by day.

As shown in FIG. 1, a general deflection yoke DY includes a pair of horizontal deflection coils (HC not shown) inside the coil separator 13 including the neck part 11 and the screen part! 2. A pair of vertical deflection coils VC are mounted on the outside of the coil separator 13, and magnet holders 14 are formed on all sides of the screen part 12. In addition, the magnet holders 14 are equipped with magnets M having an appropriate magnetic flux density for preventing pincushion of the screen by correcting deflection forces of the horizontal and vertical deflection coils HC and VC. .

As the sawtooth wave is applied to the vertical and horizontal deflection coils VC to form a magnetic field, red (R), green (G) and blue (B) electron beams emitted from the electron gun determine the dice on the screen.

FIG. 2 is a view showing a magnetic field of a deflection yoke with a conventional magnet, and magnets M1 and M2 having a predetermined magnetic flux density in the magnet holders 14 on the upper and lower sides of the deflection yoke DY of FIG. Is mounted to improve the upper and lower deflection forces on the electron beam.

The upper and lower pincushion of the screen is corrected by the upper and lower magnets M1 and M2 shown in FIG. 2 as a state diagram of the screen before and after attaching the magnet to the deflection yoke.

In the conventional deflection yoke described above, the upper and lower pin cushions are compensated to some extent by the magnets M1 and M2, but the magnetic flux densities of the upper and lower magnets M1 and M2 are not the same, so that the deflection force F is inconsistent. Therefore, the left and right distortions as shown in FIG. 3 (c) may occur on the screen, or the screen may be scattered. In addition, the left and right pincushion as well as the top and bottom of the screen, there is a problem that the top and bottom distortion occurs.

Therefore, it is an object of the present invention to provide a deflection yoke that can prevent distortion and spreading of the screen up, down, left, and right due to inconsistency of the deflection force of magnets of the deflection yoke.

In order to achieve the above object, the present invention is equipped with horizontal and vertical deflection coils inside and outside of a coil separator composed of a neck portion and a screen portion, and includes magnet holders formed to mount magnets on the screen portion. In the deflection yoke, a magnetic piece is attached to one side of the magnets mounted on the magnet holder, so that the deflection yoke can reduce the deflection force of the magnet.

Hereinafter, the deflection yoke according to the present invention will be described in detail with reference to the accompanying drawings.

4 (a) and 4 (b) are views showing the magnetic field of the deflection yoke in which the magnetic piece according to the present invention is attached to the magnet. In order to prevent distortion of the screen as shown in FIG. 3 (c), the upper or lower magnets M1 and M2 mounted on the magnetic holder 14 of the deflection yoke DY to correct the upper and lower pincushion, M2, and M2. ), The magnetic flux density of the larger magnetic flux density should be reduced to remove the right or left components of the deflection forces F1 and F2.

4 (a) is a case in which the magnetic flux density of the lower magnet M2 is greater than the magnetic flux density of the upper magnet M1, so that left and right distortion occurs, and a magnetic piece having a predetermined size on the N pole side of the lower magnet M2 ( 21 is mounted at a predetermined interval, and the magnetic piece 21 is magnetized in the opposite direction to the magnet M2 by the lower magnet M2. Therefore, the left-side component in the deflection force F2 of the lower magnet M2 is removed to prevent the left and right distortion of the screen.

4 (b) is a case where the magnetic flux density of the upper magnet M2 is larger than the magnetic flux density of the lower magnet M1 as opposed to the fourth (a) diagram, and the magnetic piece having a predetermined size on the S pole side of the lower magnet M2. The 22 is mounted at a predetermined interval, and the magnetic piece 22 is magnetized with the polarity opposite to the magnet M1 by the upper magnet M1. Therefore, the component to the right in the deflection force F1 of the upper magnet M1 is removed to prevent the left and right distortion of the screen. At this time, the size of the magnetic piece 21 should be selected to use the appropriate size proportional to the size of the deflection forces (F1), (F2). In addition, when the magnetic flux densities of the upper and lower magnets M1 and M2 are too large as a whole, a magnetic piece may be provided in the middle of the magnets M1 and M2 to reduce the total magnetic flux density. Not only the left and right distortion caused by the lower magnet, but also the up and down distortion caused by the left and right magnets can be prevented in the same manner.

As described above, the present invention is provided with a magnetic piece of a suitable size to maintain a predetermined distance in the magnets mounted on the magnetic holder of the deflection yoke to prevent pincushion of the upper, lower, left and right.

Therefore, this design has the advantage of effectively preventing the distortion of the upper and lower or left and right caused by the mismatch of the magnetic flux density of the magnets.

Claims (1)

A deflection yoke having horizontal and vertical deflection coils mounted on the inner and outer sides of a coil separator including a neck part and a screen part, and having magnet holders formed to mount the magnets on the screen part, wherein the deflection yoke is mounted to the magnet holder. A deflection yoke is attached to one side of the magnet so that a pincushion magnetic field generated at the top, bottom, left and right of the screen can be corrected by forming a magnetic flux density of the magnet.