JPH0237654A - Deflector - Google Patents

Abstract

PURPOSE:To aim at coincident center convergence by providing, backward of a deflecting yoke disposed on an image receiving tube, a pair of auxiliary magnetic field generators for generating tetrapolar or hexapolar magnetic fields so as to accord a center beam with both side beams. CONSTITUTION:A dc current is supplied to auxiliary coils 21 and 22 constituting a pair of auxiliary magnetic field generators 16 and 17 fixingly arranged on the surface of the backward extending portion 14a of a coil bobbin 14, thereby generating magnetic fields phiA and phiB in magnetic substances 19 and 20, respectively. The fields phiA and phiB are identical in magnitude but opposite in direction with respect to beams generated by electron guns B and R so that a red beam is moved toward an (a) direction by the effect of the field phiA while a blue beam is moved toward a (b) direction by the effect of the field phiB. Therefore, any deviation on an image plane in the horizontal direction of the guns B and R can be corrected, thereby at last obtaining a preferable misconvergence property capable of coincident center convergence and an image plane property.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection device used, for example, in a display cathode ray tube having an in-line electron gun, and which is particularly useful for use in a high resolution cathode ray tube. be.

[Conventional technology]

In recent years, the demand for high resolution and high precision has expanded, especially in fields such as display monitors and large color TVs, and cathode ray tubes have also become higher definition and resolution, and higher precision is also required for misconvergence characteristics. .

FIG. 7 is a block diagram of a conventional deflection yoke and what is generally called a CP (convergence, utility) assembly for adjusting color purity and convergence at the center of the screen.

In FIG. 7, reference numeral 31 indicates a deflection yoke, and reference numeral 32 indicates a CP assembly.

FIG. 8 is an exploded perspective view showing the structure of the CP-assembly 32, in which 41a and 41b are bipolar magnet parts, 42a
, 42b indicates a four-pole magnet section, and 43a and 43b indicate a six-pole magnet section.

Quadrupole magnet section 42a related to this invention which will be described later
, 42b will be explained with reference to FIG.

FIG. 9(al) is a diagram for explaining the quadrupole magnet section 42a, and FIG. 9fbl is a diagram for explaining the quadrupole magnet section 42b.
l indicates the relationship between the 4-pole magnetic field and the three electron beams of the cathode ray tube, and as you can see from the figure, the action of the 4-pole magnetic field acts on both side beaches on the central beam by the same amount and in opposite directions. .

By adjusting the mutual opening angle and the overall rotation angle of the two-pole identical ring-shaped magnets of the four-pole magnet parts 42a and 42b, the strength and direction of the magnetic field exerted on both side beaches can be adjusted, and the magnetic field on both side beaches can be adjusted. It is a well-known technique that can match at the center of the screen.

[Problem to be solved by the invention]

By the way, in conventional self-convergence type deflection devices, if misconvergence occurs at the center of the screen, it is not possible to obtain good screen characteristics over the entire screen. There was a problem in that it was extremely difficult to readjust.

The present invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a deflection device that can be manufactured at low cost without requiring any new parts for the convergence correction means.

[Means to solve the problem]

The deflection device according to the present invention has four poles by passing a direct current through an auxiliary coil wound at the rear side of a deflection yoke mounted on a picture tube in which three electron guns are arranged in-line. Alternatively, a pair of auxiliary magnetic field generating means is provided which generates a six-pole magnetic field and is orthogonal to the arrangement direction of the electron gun.

[For production]

In this invention, the magnetic field generated by passing a DC current through the auxiliary coil of the auxiliary magnetic field generating means causes the beams on both sides generated from the electron guns arranged in-line to be horizontally aligned with each other before being deflected by the deflection yoke. Shift in the opposite direction to match the center convergence.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, the deflection yoke 10 includes a core 11 and a core 11.
1, and a hollow-shaped horizontal deflection coil 15, which is arranged on the inner surface of the vertical deflection coil 13 via a coil bobbin 14. A pair of auxiliary magnetic field generating means 16.1 is provided on the surface of the rear enlarged portion 14a of the
7 is arranged and fixed, and three electron guns B, G, and R of blue, green, and red are mounted and fixed on the color picture tube neck part 18 arranged horizontally in a line (in-line).

As shown in FIG. 2, auxiliary magnetic field generating means 16 and 17 arranged on the back side of the enlarged rear part 14a of the coil bobbin 14 are arranged outside the picture tube neck part 18 at right angles to the arrangement direction of the three electron guns B, G, and R. are arranged opposite to each other.

In addition, the auxiliary magnetic field generating means 16 and 17 are each approximately "K".
It is composed of a square-shaped magnetic piece 19.20 and an auxiliary coil 21.22 wound around this magnetic piece 19.20.
Of the electron guns R, G, and B, the electron guns B, which are located on both sides, are set to face each other.

Furthermore, the auxiliary coils 21 and 22 are connected in series to a separate DC power supply circuit 23, as shown in FIG.
A direct current is passed through the auxiliary coils 21 and 22.

At this time, by connecting the volume 24 in parallel to the auxiliary coils 21.22 according to the required number, the amount of electricity flowing through the auxiliary coils 21.22 can be adjusted.

Next, the operation will be explained. Auxiliary magnetic field generating means 16.1
The auxiliary coils 21 and 22 that make up the DC power supply circuit 2
3 causes a direct current to flow, causing the magnetic material 19.2
0, magnetic fields φA and φB are generated as shown in FIG. This magnetic field φ angle, φB, is generated by electron guns B and R.The blue beam emitted from electron gun B has the same size and opposite direction for the red beam emitted from electron gun R. , due to the action of the magnetic field φA, the red beam becomes a
direction, the blue beam moves in the b direction due to the action of the magnetic field ψB, and this also means that the electron gun beam is deflected by the deflection coke 1.
This occurs before being deflected at 0.

As a result, as shown in Fig. 5, the horizontal deviation of B and R of the screen is corrected in the direction of the arrow (a direction, b direction in Fig. 4), and a good misconvergence is achieved where the center convergence finally matches. It is possible to obtain characteristic screen characteristics.

In this regard, the auxiliary magnetic field generating means 16.1 of the invention
7 is not activated, the center convergence will not match unless the side beams of the electron guns B and R are corrected as shown in FIG. Center convergence can be matched.

In addition, a coil 2526 is wound below the auxiliary coil 21.22 for purposes other than center convergence correction.
One of the major features is that the center convergence correction means is wound on the same part without requiring a separate device.

In the above embodiment, the auxiliary magnetic field generating means 16.
Although we have explained only one direction of the current flowing through the auxiliary coils 21 and 22 constituting the auxiliary coil 17, by making the DC power supply positive and negative, the inner side beam of the three-electron system R9G, B (
The beams of electron guns B and R can be moved horizontally to the right and left, respectively.

Further, although the auxiliary magnetic field generating means 16 and 17 are arranged and fixed on the back side of the enlarged rear part of the coil bobbin, the fixing position is not limited to the above embodiment, and may be located on the rear side of the deflection yoke.

Further, as an embodiment of the present invention, a means for generating auxiliary magnetic fields for both side beams using a 41-box magnetic field has been described. It is naturally possible to generate a six-pole magnetic field and to align the center beam with both side beams based on the operation of the conventional six-pole magnet.

〔Effect of the invention〕

As described above, according to the present invention, the three electron guns are located on the rear side of the deflection yoke mounted on the picture tube arranged in-line, and generate a quadrupole magnetic field or a hexapole magnetic field to center the electron beam. Since it is configured to include a pair of auxiliary magnetic field generating means for matching the beam and both side beams, no new parts are required for the center convergence correction means, and there is no need to readjust the center convergence, and the device is easy to use. This has the effect of making it cheaper.

[Brief explanation of the drawing]

FIG. 1 is a rear view showing a schematic configuration of a deflection device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of an auxiliary magnetic field generating means in the same embodiment, and FIG. 3 is a coil forming the auxiliary magnetic field generating means. 4 is an explanatory diagram of the operation of the auxiliary magnetic field generating means, and FIG. 5 is a connection diagram of the electron beam (B
, R) are converged; FIG. 6 is an explanatory diagram of the state in which side beams are not corrected because the deflection device of the present invention is not operating; FIG. 7 is a diagram of the conventional deflection. A side view of a cathode ray tube with a yoke and a CP-assembly attached, FIG. 8 is an exploded perspective view showing the configuration of the CP assembly, and FIG. It is a figure. 10... Deflection yoke, 13... Vertical deflection coil, 1
5...Horizontal deflection coil, 16.17...Auxiliary magnetic field generating means, 19.20...Magnetic piece, 21.22...Auxiliary coil, R, G, B...Electron gun. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] A vertical deflection coil wound around a core attached to the neck of a cathode ray tube in which three electron guns of blue, green, and red are arranged horizontally in a row, and a horizontal deflection coil arranged around this vertical coil. A deflection yoke having a deflection yoke and an auxiliary coil located at the rear side of the deflection yoke generates a magnetic field in the opposite direction by passing a direct current to the two beams on both sides of the three beams generated from the three electron guns. and auxiliary magnetic field generating means for correcting center convergence by shifting the magnetic fields in opposite directions in the horizontal direction.