JP2000057965A - Color picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a color picture tube device capable of preventing misconvergence caused by a center beam and a pair of side beams receiving unbalanced force from a pair of two circular bipolar magnets. SOLUTION: In this color picture tube device having a pair of two circular bipolar magnets 44, installed rotatably on the neck circumference of the electron gun side of a deflection yoke, for generating a magnetic field for corresponding orbits of three electron beams in the same direction, the inner circumferential edge near magnetic poles of the bipolar magnets 44 is formed into a linear shape perpendicular to a magnetic flux 51 generated from the magnetic poles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube apparatus, and more particularly to a color picture tube device which is arranged on the electron gun side of a deflection yoke and which improves a two-pole magnet for correcting a convergence shift due to a geomagnetism or a position shift of the electron gun. The present invention relates to a picture tube device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a color picture tube device emits three electron beams into a cylindrical neck 2 of a funnel 1 having a funnel shape which forms an envelope together with a panel (not shown). An electron gun 3 is disposed, and the three electron beams emitted from the electron gun 3 are applied from the outside of the large diameter portion 4 of the funnel 1 to the outside of the neck 2 of the deflection yoke 5 in the horizontal and vertical directions generated by the deflection coils. It is deflected by a vertical magnetic field and horizontally and vertically scans a phosphor screen formed of a three-color phosphor layer provided on the inner surface of the panel via a shadow mask, thereby forming a structure for displaying a color image.

At present, such a color picture tube apparatus is an electron gun which emits three electron beams emitted from an electron gun 3 in a row composed of a center beam and a pair of side beams passing on the same horizontal plane. The magnetic field generated by the horizontal deflection coil of the deflection yoke 5 is defined as a pincushion type, and the magnetic field generated by the vertical deflection coil is defined as a barrel type.
A self-convergence in-line type color picture tube device for concentrating the three electron beams arranged in a row over the entire screen by these horizontal and vertical magnetic fields has been widely put to practical use.

In such a color picture tube device, a separator 7 for supporting the horizontal and vertical deflection coils is further provided on the outer periphery of the neck 2 at the rear portion (on the electron gun 3 side) of the deflection yoke 5.
A pair of annular quadrupole magnets 8 for generating a magnetic field for correcting the rotational deviation of the electron gun 3 via a portion extending on the outer periphery of the neck of the electron gun 3, the earth magnetism, and sealing (joining) of the funnel 1 to the panel. A pair of annular two-pole magnets 9 that generate a magnetic field that corrects mislanding caused by a deviation in landing of the three electron beams with respect to the three-color phosphor layer in a certain direction due to displacement, displacement of the electron gun, or the like. Are located. A static convergence corrector 12 (PCM) including a pair of four-pole and six-pole magnets 10 and 11 is disposed on the outer periphery of the neck 2 behind the magnets 8 and 9. Part 2
Each set of the magnets 8 to 11 is rotatably combined with each other so that the mutual magnetic pole position with respect to the electron beam can be changed.

In general, a color picture tube is a terrestrial magnetism, an electron gun 3
, A displacement of the funnel 1 with respect to the panel, a landing deviation or a convergence deviation of the three electron beams.

The pair of two-pole magnets 9 generates a magnetic flux 13 in the direction of the arrow between the magnetic poles N and S in principle, as shown in FIG. Beam 14
B, 14G, 14R (only center beam 14G is shown)
Is displaced in the direction of an arrow 15 perpendicular to the magnetic flux 13. Therefore, by rotating the annular magnet 9 to change the direction of the magnetic field, the three electron beams 14B, 14G, and 14R can be displaced in desired directions, and the landing deviation can be corrected.

A pair of quadrupole magnets 10 of the static convergence correction device 12 is shown in FIG.
As shown in (b), the magnetic flux 1 in the direction of the arrow between the magnetic poles N and S
6 is generated and the pair of side beams 14B and 14R are displaced in the directions of arrows 17a and 17b approaching the center beam 14G without affecting the center beam 14G. As a result, the pair of side beams 14B, 14
Correct the convergence of R. As shown in FIG. 4C, the pair of six-pole magnets 11 has magnetic poles N,
A magnetic flux 18 indicated by an arrow is generated between S, thereby displacing the pair of side beams 14B and 14R in the direction of the arrow 19. Therefore, the static convergence of the three electron beams 14B, 14G, 14R can be adjusted by appropriately combining the magnetic fields generated by the pair of annular magnets 10, 11.

[0008]

As described above, the landing displacement of the three electron beams in the same direction caused by the terrestrial magnetism, the displacement of the electron gun, the displacement of the funnel to the panel, etc., is caused by the rear displacement of the deflection yoke. By a pair of annular two-pole magnets arranged on the outer periphery of the neck,
By generating a magnetic field 13 in the direction of the arrow shown in FIG.
This is performed by displacing the three electron beams 14B, 14G, 14R arranged in a line in the direction of arrow 15 perpendicular to the magnetic field 13.

However, the magnetic field actually generated by the two-pole magnet 9 has a magnetic flux density 21 distributed as shown in FIG. 5, and the magnetic flux 13 is perpendicular to the inner peripheral edge of the magnet 9 as shown in FIG. And draw an arc toward the opposing magnetic pole. In this case, the center beam 14G passing on the tube axis passes through the center of the magnetic field of the magnet 9, and the magnetic fluxes 13 from both sides concentrate. Therefore, as shown by an arrow 15G, a larger force is applied to the pair of side beams 14B, 14R indicated by arrows 15B, 15R than the pair of side beams 14B, 14R passing away from the center of the magnetic field. receive.

That is, the center beam 14G and the pair of side beams 14B and 14R receive an unbalanced force. Even in this case, the convergence deviation due to the PCM can be corrected, and the static convergence at the center of the screen can be adjusted. Accordingly, as shown in FIG. 7, if the angle of the center beam 14G bent by the magnetic field generated by the dipole magnet 9 is θ1, and the angle of the pair of side beams 14B and 14R is θ2, the center beam 14G is θ1> θ2 and an angle larger than the pair of side beams 14B and 14R.

As a result, the center beam 14G is
As shown by a solid line when not affected by the magnetic field of a pair of annular magnets generating a two-pole magnetic field and a broken line when affected by a magnetic field generated by the deflection yoke, Incident at a large angle. As a result, as shown in FIG. 9 with respect to the center beam 14G and one side beam 14B, when the magnetic field of the dipole magnet 9 does not affect the screen, even if it is deflected by the deflection yoke 5, the image is displayed as shown by the solid line. However, when the deflection yoke 5 generates a pincushion-type horizontal deflection magnetic field as shown by a broken line, the side beams 14B
, The deflection of the center beam 14G is greater than that of the arrow 2
As shown by 6B and 26G, misconvergence occurs in which the center beam 14G shifts right or left with respect to the pair of side beams 14B and 14R. In addition,
In FIG. 9, a point 27 indicates the concentration at the center of the drawing.

The present invention provides a color picture tube apparatus for preventing misconvergence caused by an unbalanced force between a center beam and a pair of side beams by a pair of annular two-pole magnets. Aim.

[0013]

SUMMARY OF THE INVENTION An electron gun for emitting three electron beams disposed within a cylindrical neck of a funnel;
A deflection yoke arranged outside the funnel to generate a magnetic field that deflects the three electron beams in horizontal and vertical directions;
A color picture tube device rotatably disposed on the outer periphery of the neck of the deflection yoke on the electron gun side and having a pair of annular dipole magnets for generating a magnetic field for correcting the trajectories of the three electron beams in the same direction; In the above, the inner peripheral edge near the magnetic pole of the two-pole magnet was formed in a linear shape orthogonal to the magnetic flux generated from the magnetic pole.

An electron gun which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same plane and arranged inside a cylindrical neck of the funnel; and an electron gun arranged outside the funnel; A deflection yoke for generating a magnetic field for deflecting the three electron beams in the horizontal and vertical directions, and rotatably disposed on the outer periphery of the neck of the deflection yoke on the electron gun side, to correct the trajectory of the three electron beams in the same direction; In a color picture tube device having a pair of annular dipole magnets for generating a magnetic field, an inner peripheral edge near a magnetic pole of the dipole magnet is formed in a linear shape orthogonal to a magnetic flux generated from the magnetic pole. The length of the shape portion was longer than the interval between the pair of side beams when passing through the magnetic field generated by the bipolar magnet.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an in-line type color picture tube device which is one embodiment of the present invention. This color picture tube device has an envelope composed of a panel 30 and a funnel-shaped funnel 31, and a phosphor screen 32 composed of a three-color phosphor layer emitting blue, green and red light is provided on the inner surface of the panel 30. A shadow mask 33 is arranged inside the phosphor screen 32 so as to face the phosphor screen 32. Meanwhile, funnel 31
A center beam 35B and a pair of side beams 35B, 35B passing on the same horizontal plane
Three electron beams 35B, 35B, 3
An electron gun 36 for emitting 5R is provided. A deflection yoke 39 is mounted from the large diameter portion 37 of the funnel 31 to the outer surface of the adjacent portion of the neck 34.

The deflection yoke 39 includes a horizontal deflection coil 40H for generating a horizontal deflection magnetic field for horizontally deflecting the three electron beams 35B, 35B, 35R emitted from the electron gun 36, and a vertical deflection magnetic field for vertically deflecting the three electron beams 35B, 35B, 35R. The horizontal and vertical coils 40H and 40V are formed in a structure supported by a separator 41.

Further, on the outer periphery of the neck 34 at the rear (on the side of the electron gun 36) of the deflection yoke 39, the separator 4
A pair of two annular quadrupole magnets 43 for generating a magnetic field for correcting the rotational deviation of the electron gun 36 through a portion extending on the outer periphery of one neck 34, the earth magnetism, and sealing of the funnel 31 to the panel 30. (Junction) displacement, displacement of the electron gun 36, etc., the three electron beams 3
A pair of annular two-pole magnets 44 for generating a magnetic field for correcting mislanding caused by a deviation of the landing of 5B, 35B, 35R in a certain direction is arranged.

On the outer periphery of the neck 34 behind the magnets 8 and 9, a pair of two annular four poles and six
A static convergence corrector 47 (PCM) including pole magnets 45 and 46 is arranged. A pair of these two annular magnets 43, 44, 45, 46
Are rotatably combined so that their mutual magnetic pole positions with respect to the three electron beams 35B, 35B, 35R can be changed.

In particular, in this embodiment, as shown in FIG. 2, the pair of two-pole magnets 44 includes magnetic poles N and S.
A magnetic flux 49 generated between these magnetic poles N and S is formed near the inner peripheral edge.
Is formed in a linear shape orthogonal to
Of the deflection yoke extending on the outer periphery of the neck
1 is formed in a structure in contact with the outer peripheral surface. Preferably, the length of the linear portion 50 is such that the pair of side beams 3 when passing through the magnetic field generated by the two-pole magnet 44 is used.
It is longer than the interval between 5B and 35R.

As described above, the three electron beams 35B, 35B
B, 35R generate a magnetic field for compensating for a mislanding caused by a deviation of the landing in a certain direction.
When the inner peripheral edges near the magnetic poles N and S of the pair of annular two-pole magnets 44 are formed in a linear shape, the concentration of magnetic flux on the center beam, which occurs in the case of the conventional two-pole magnet shown in FIG. The magnetic flux 51 between N and S forms three electron beams 35B.
, 35G, 35R.

Therefore, by configuring as described above, the unbalanced directionality with respect to the three electron beams 35B, 35B, 35R and the three electron beams 35B, 35B, 3R can be obtained.
The amount of movement of 5R is eliminated, the convergence between the center beam 35G and the pair of side beams 35B and 35R at the periphery of the screen is eliminated, and a color picture tube device that displays a high-quality image can be configured.

In the above embodiment, the in-line type color picture tube device has been described. However, the present invention is applicable to color picture tube devices other than the in-line type color picture tube device.

[0024]

In the vicinity of the magnetic poles of a pair of annular two-pole magnets which are rotatably disposed on the outer periphery of the neck of the deflection yoke on the electron gun side and generate a magnetic field for correcting the trajectories of three electron beams in the same direction. Is formed in a linear shape, the unbalanced directionality with respect to the three electron beams and the amount of movement of the three electron beams are eliminated, and a color picture tube device which displays a high-quality image can be constructed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an in-line type color picture tube device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an annular two-pole magnet arranged in the color picture tube device.

FIG. 3 is a diagram showing a configuration of a conventional color picture tube device.

FIG. 4A is a view for explaining the operation of an annular two-pole magnet arranged in a conventional color picture tube device;
FIG. 4B is a diagram for explaining the operation of the annular four-pole magnet of the static convergence correction device.
(C) is a diagram for explaining the operation of the annular six-pole magnet of the static convergence correction device.

FIG. 5 is a diagram showing a distribution of magnetic flux density of the annular two-pole magnet.

FIG. 6 is a diagram for explaining an effect of a conventional pair of annular two-pole magnets actually acting on three electron beams arranged in a line.

FIG. 7 is a diagram for explaining a difference in the action of a pair of conventional annular bipolar magnets on a center beam and a pair of side beams.

FIG. 8 shows a state in which a center beam affected by the magnetic field of a pair of conventional annular two-pole magnets and a center beam not affected by the magnetic field are incident on the pincushion horizontal deflection magnetic field of the deflection yoke. It is a figure for explaining a difference.

FIG. 9 is a diagram for explaining misconvergence in a peripheral portion of a screen of three electron beams arranged in a row and influenced by a magnetic field of a conventional pair of annular two-pole magnets.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 ... Funnel 34 ... Neck 35B, 35R ... A pair of side beams 35 ... Center beam 36 ... Electron gun 39 ... Deflection yoke 44 ... Circular dipole magnet 50 ... Linear part 51 ... Flux

Claims (2)

[Claims] 1. An electron gun for emitting three electron beams arranged in a cylindrical neck of a funnel, and a magnetic field arranged outside the funnel and deflecting the three electron beams horizontally and vertically. A deflection yoke; and a pair of annular dipole magnets rotatably disposed on the outer periphery of the neck of the deflection yoke on the electron gun side and generating a magnetic field for correcting the trajectories of the three electron beams in the same direction. A color picture tube device, wherein an inner peripheral edge near a magnetic pole of the two-pole magnet is formed in a linear shape orthogonal to a magnetic flux generated from the magnetic pole. 2. An electron gun which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same plane and arranged in a cylindrical neck of the funnel, and is arranged outside the funnel; A deflection yoke for generating a deflection magnetic field for deflecting the three electron beams in the horizontal and vertical directions, and rotatably disposed on an outer periphery of a neck of the deflection yoke on the electron gun side, and correcting the trajectory of the three electron beams in the same direction; A color picture tube device having a pair of annular dipole magnets for generating a magnetic field, wherein an inner peripheral edge near a magnetic pole of the dipole magnet is formed in a linear shape orthogonal to a magnetic flux generated from the magnetic pole. A color picture tube device wherein the length of the linear portion is longer than the distance between a pair of side beams when passing through the magnetic field generated by the bipolar magnet.