JPS63294653A - In-line color picture tube - Google Patents

Abstract

PURPOSE:To correct distortion of beam spot on a fluorescent screen by providing an electron gun structure with a pole piece consisting of magnetic bodies arranged for forming four magnetic fields to respective electron beams together with compensatory coil pairs corresponding to those magnetic fields. CONSTITUTION:A color cathode-ray tube 3, which comprises an electron gun structure 2 including three electron guns 1R, 1B, 1G in in-line arrangement, a fluorescent screen 30 and a shadow mask 31, is provided with a compensatory coil 6 on its outside and a pole piece 7 consisting of magnetic bodies on the electron gun structure 2, in addition to a deflection yoke 4 and a static convergence magnet 5. Then, twelve magnetic poles 8 in total are formed along the outer periphery of a neck 9 by means of compensatory coils 6 wound around the first magnetic cores 16a, and the second magnetic core 16b in a ring form is installed along the outer periphery common to the compensatory coils 6. Furthermore, magnetic fields generated by the compensatory coils 6 are guided by twelve pole pieces 7 in total which extend from portions facing magnetic poles 8 to diagonal corners of respective electron beams R, G and B so as to form four magnetic fields 10. Distortion of beam spot caused by a deflection yoke can be easily corrected in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device suitable for correcting beam spot distortion in a color picture tube device VC@ using a color cathode ray tube having five electron guns arranged in-line. .

[Prior Art] A conventional device uses electron beams on both sides of an in-line arrangement, as described in Japanese Patent Application Laid-Open No. 57-168455.

(hereinafter referred to simply as the side beam), in order to distort only the side beam.
11E with 4 poles in total! Two magnetic fields with different directions were applied to each side beam using a plate-shaped electrode piece made of a coil and a magnetic material.

[Problem that the invention seeks to solve]

In the above conventional technology, no consideration is given to means for distorting the electron beam at the center of the inline array (hereinafter referred to as the center beam), and when both side beams are distorted, each side beam is directed in opposite directions. Go to
The drawback was that the convergence changed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a means for correcting beam spot distortion on a phosphor surface by distorting each of five electron beams in an in-line arrangement without causing almost any change in convergence.

[Means for solving problems]

The above purpose is to equip the electron gun assembly with a total of 12 ball pieces made of magnetic material, each of which is electrically distributed to form a quadrupole magnetic field for each of the 5 electron beams in an in-line array. Corresponding total 1
This is achieved by equipping the color cathode ray tube with a pair of two-pole correction coils.

[For production]

The magnetic field generated by the correction coil is guided by the ball piece and forms a four-pole magnetic field with magnetic poles in the diagonal direction for each electron beam. Due to the 04-pole magnetic field, each electron beam receives a concentrated horizontal deflection force and a diverging vertical deflection force with respect to the center of the electron beam.

Therefore, each electron beam 4° of the quintuplet beam is
It is distorted into an oval shape with its long axis in the vertical direction. As a result, it is possible to offset and correct the distortion of the oblong beam spot having long sleeves in the horizontal direction on the fluorescent surface. In addition, since the magnetic field of the correction coil is rarely generated at the center of each electron beam, or the magnetic field is canceled out by the magnetic field, there is almost no movement of the electron beam, and convergence hardly changes.

do not.

〔Example〕

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

FIG. 1 is a diagram showing a first embodiment of the present invention. The figure (eL) shows an in-line array of five-electron gun IR.

A color cathode ray tube 5 is shown which includes an electron gun groove body 2 including IB and IG, a fluorescent surface 51, and a shadow mask 31. The color cathode ray tube 5 includes a deflection yoke 4 and a deflection yoke 4.

Similar to the magnetic, convergence, and magnet 5, the electron gun structure is equipped with a correction coil 6 according to the present invention outside and two ball pieces 7 made of a magnetic material. Figure 1 Cb
) Shows a sectional view of the main parts of K. In FIG. 1, a total of 12
magnetic poles 8 are formed on the outer periphery of the neck portion 9 of the color cathode ray tube 6. Further, a ring-shaped second coil is provided on the outer periphery of the correction coil 6.

716b is provided. Furthermore, the magnetic field created by the correction coil 6 is guided by a total of 12 ball pieces 7 extending from the part rotated opposite the magnetic pole IK to the diagonal part of each electron beam R, G, H. , B form a quadrupole magnetic field 10. of each electron beam section.

The state of the magnetic field is shown in Figure 2 (α). The magnetic field guided from the magnetic pole 8 passes through the ball piece 7, forming a quadrupole magnetic field 10 as shown in FIG. 14g and a deflection force of 14A in the vertical direction, each electron beam becomes an oval shape as shown in Fig. 2 (Cb) K. Next, FIG. 1(C) shows the correction coil 6.
The circuit diagram of the section is shown. In FIG. 1(C), the correction coil 6 is connected in series with a horizontal deflection coil 12 via a diode and a bridge 11, and is connected to a horizontal deflection circuit 15. The waveform of the current flowing through the circuit shown in the figure is shown in FIG. 1(d). Figure 1<c>-.

As shown in (cL), '
The first current t has a sawtooth waveform, and a sawtooth wave current No. 1 with a horizontal deflection period TH flowing through the horizontal deflection coil 12 is full-wave rectified by a diode and a bridge 11 in the correction coil 6. , an approximately triangular wave current flows. As can be seen from the waveforms of the current it flowing through the horizontal deflection coil and the current it flowing through the correction coil 6, when each electron beam receives a large deflection force from the horizontal deflection current, a large current flows through the correction coil 6.

That is, when each electron beam is deflected to the left and right ends of the fluorescent surface 15, the quadrupole magnetic field 10 acts on each of the electron beams FL, G, and B, as shown in FIG. do. At this time, the second magnetic core 16b has a 4-pole magnetic field 1
0, and the magnetic resistance of the magnetic path is reduced, so the quadrupole magnetic field 1o is strengthened. Due to the quadrupole magnetic field 10, the electron beams R, G, and B are subjected to a horizontal deflection force 14g toward the center of the electron beam and a vertical deflection force 14A away from the center of the electron beam. As a result, the electron beams R, G, and B after passing through the electron gun assembly 2 are deformed as shown in FIG. 2Cb). And Fig. 5 (α
)K, the distortion of the oblong beam spot 22 having a long axis in the horizontal direction at the left and right ends of the fluorescent surface 15 generated in the self-convergence type deflection yoke 4 is shown in FIG. 2(b).
), the distortion of the electron beams R, G, B formed by the correction coil 6 and the ball piece 7 is canceled out, and the fifth
The beam spot 22 can be corrected as shown in Figure Cb). Note that the position of the electron gun assembly 2 including the ball piece 7 is called a shield cup in order to avoid non-thermal interaction with the electron lens.

The vicinity of the final stage accelerating electrode is preferable.

4 and 5 show second and third embodiments of the present invention. In each of the above figures, supplementary information is provided.

The positive coil 6 is wound around a magnetic core 16 divided into six pieces, and connected in the same manner as in FIG. 1(C). Further, the ball piece 7 provided in the electron gun assembly 2 is configured similarly to the first @1(b). The correction coil 6 may be wound around the magnetic core 16 in a toroidal shape as shown in FIG.
As shown in the figure, the magnetic core 16 may be wound in a saddle shape. Further, the magnetic core 16 may be divided between arbitrary adjacent magnetic poles 80.

According to the second and fifth actual Mal according to the present invention described above, a quadrupole magnetic field 10 is formed for each electron beam R, G, and B, respectively, as in the first embodiment according to the present invention, Beam spot distortion can be corrected at the left and right ends of the fluorescent surface 15. Furthermore, by dividing the magnetic core 16, the overall volume of the magnetic core 16 can be reduced, resulting in material savings.

FIG. 6 shows a fourth embodiment of the present invention.

In this embodiment, as shown in FIG. 5A, ball pieces 7α and 7A are provided at two locations in the front and rear of the electron gun groove body 2, and each ball piece 7α and 7b [of the opposing full-color cathode ray tube 5] is provided. Correction carp on the outer periphery of the neck part 9.

/I/ Equipped with 6G and 6b. B- in Figure 6(a)
A sectional view of the main part taken along line B is shown in the same figure (Cb). TiC is shown, and C-
A cross-sectional view of the main part taken along line C is shown in FIG. The first correction coil 6a shown in FIG. 6 has a total of four magnetic poles 8.
A magnetic field is guided to the four ball pieces (first group of ball pieces) 7α to form a quadrupole magnetic field 10s with respect to the center beam GK. On the other hand, the second
The correction coil 6b forms a total of 8 magnetic poles and has 8 ball pieces (second group of ball pieces) 7bKfB
The field is directed to form a quadrupole magnetic field 10b for side beams R, B. FIG. 6(d) shows a block diagram of a circuit that generates currents to be passed through the correction coils 6α and 6k. In Fig. 6, 171 is the first Bakubola wave generator, 17b is the second
parabolic wave generator.

1 is an adder, and 23 is an amplifier. The correction coils 6α and 6b shown in FIGS. 6(A) and 6(C) are connected in series as shown in FIG. 6(d), and are supplied with a current i. same.

In figure (d), a sawtooth wave signal H with a horizontal deflection period TH
By applying 8 AW to the first parabolic wave generator 17α, a parabolic wave current i3 with a horizontal deflection period TH as shown in the same figure is obtained.On the other hand, with a vertical deflection period TF
Sawtooth wave signal VsAW 2nd If) Pa5ho5tlL
By being applied to the generator 174, a parabolic wave current i4 having a vertical deflection period TV as shown in FIG. 2(f)0 is obtained. The waveforms of the current '3s'4 are combined by the adder 18 and amplified by the amplifier 23, so that a parabolic wave with a horizontal deflection period TH and a parabolic wave with a vertical deflection period TV are superimposed as shown in FIG. You can get electric power!

Therefore, by supplying the current i to the correction coils 17α, 17b, the quadrupole magnetic fields 10α, 10b formed at the ends of the ball pieces 7α, 7A are applied to the left and right and upper and lower ends of the fluorescent surface 15. The more it is deflected, the stronger it becomes.

In the embodiment shown in FIG.

- Due to the block α, a quadrupole field 10α and a leakage magnetic field 10c as shown in FIG. 7(α) are generated. Center bee.

The beam G is thickened (distorted) into an elliptical shape with a long axis in the vertical direction by the quadrupole magnetic field 10α. At the same time, the side beams R and B are slightly distorted into an elliptical shape with a long axis in the horizontal direction by the leakage magnetic field 1ocrc, and are distorted from each other. In addition, the ball piece 7b forms a quadrupole magnetic field 10b and a leakage magnetic field 10d as shown in FIG. 7Cb, and the center beam G
By strengthening the magnetic field created by the ball piece 7b, the side beams R and B are greatly distorted into elliptical shapes with their long axes in the vertical direction, and the entire side beams R and B move away from each other. Furthermore, the center beam G is distorted by l'' into an ellipse having a long axis in the horizontal direction due to the leakage magnetic field 10d.

Electron beams R and G shown in Fig. 7 (cL) and (b) above
, B are combined, so that the electron beams R, G, and B after passing through the electron gun assembly 2 become as shown in FIG. 2(A).
Transforms into a sea urchin. Then, the distortion of the elliptical beam spot 22 having a long sleeve in the horizontal direction at the periphery of the fluorescent surface 15, which is generated in the self-convergence type deflection yoke as shown in FIG. As shown in Figure 11,
The beam spot 22 can be corrected into a circular shape over the entire surface of the fluorescent surface 15. Furthermore, changes in the convergence on the fluorescent surface 15 due to the movement of the side beams R and B are unlikely to occur because the changes shown in FIGS. 7(-) and (b) cancel each other out. do not have. In this embodiment, since the interval 1 between the magnetic poles 8 can be made large, the leakage magnetic field up to the electron beams R, G, and B can be reduced, and the correction coils 6a, tsb.

It has the advantage that the magnetic field from the magnetic field can be efficiently guided to the ball pieces 7α, 74 and the electron beams R, G, and B.

FIG. 8 is a diagram showing a fifth embodiment according to the present invention.

In addition to the configuration of FIGS. 6A and 6C, as shown in FIG.
.

19B, and the other configurations are the same as in the fourth embodiment. The state of the magnetic field in the main part of this example is shown in Figure 9 (α)#(
Shown in A). In this embodiment, as shown in FIG. 9(α), the first correction coil 6 forms a total of four magnetic poles 8.
In addition to the configuration of α and ball piece 7α, side beams R and H
Ring-shaped magnetic pieces 19R and 19B were provided around the periphery.

In addition, as shown in FIG. 9Cb), a second correction coil 6b and a ball piece 7 form a total of eight magnetic poles 8.
In addition to the configuration of b, a ring-shaped magnetic piece 19G was provided around the center beam G. No.

In FIG. 9(G), the magnetic pieces 19R and 19B have the effect of shielding the leakage magnetic field 10C formed by the side coils R and B [through the ball piece 7α] by the tenth correction coil 6α. A quadrupole magnetic field 10α is formed only in the center beam G by the coil 6α, and the beam is distorted into an ellipse having a long axis in the direction of alignment, and the sight beams R and B do not change. On the other hand, the first magnetic piece 19G in FIG. 9(h) has the effect of shielding the leakage magnetic field 10d that the second correction coil 6b forms in the center beam G through the ball piece 7b, so the second correction coil 6AK Therefore, the quadrupole magnetic field 10b is formed only in the side beams R and B, which are distorted into an elliptical shape having a long axis in the vertical direction, and the center beam G remains unchanged. For this reason, the leakage magnetic field 100 of the ball piece 7
, 104 on the electron beam can be reduced.

Then, the distortions of the above electron beams R, G, and B are combined.

By this, the electron beam R after passing through the electron gun structure 2,
G and B are deformed as shown in FIG. 2(A).

Therefore, as in the fourth embodiment, a circular beam spot 22 can be obtained on the entire surface of the fluorescent surface 15 as shown in FIG. As described above, in this embodiment, the leakage magnetic fields 10C and 10d generate electric currents in a different direction from the correction direction.

The child beam is deformed by magnetic pieces 19R, 19G, and 19B.

Since this can be prevented, the effect of correcting distortion of the beam spot 22 is further increased.

In this embodiment, as shown in FIG. 10, a magnetic field 20 generated when the horizontal deflection magnetic field is induced into the magnetic core 16 and the ball pieces 7a, 7b around which the first and second correction coils 6α, 6b are wound. In the figure (-), the side beam R
, B, and in the same figure Cb), the central beam G
It has the effect of shielding against. Therefore, by appropriately setting the lengths of the magnetic pieces 19R, 19G, and 19B with respect to the advancing direction of the electron beam, the overall effect of the induced magnetic field 20 acting on each electron beam R, G, and B can be increased. Deflection force 2
By controlling 1R, 21G, and 21B, it is possible to prevent misconvergence caused by a difference in the amount of deflection of each electron beam on the fluorescent surface 15.

In addition, as shown in each of the embodiments of the present invention, if the total number of magnetic poles is 12, the correction coil may be wound around a plurality of magnetic cores divided between each magnetic pole.

Two sets may be provided, shifted in the direction of movement of the electron beam. Further, the current supplied to the correction coil may be either a substantially triangular wave obtained by full-wave rectification of the horizontal C direction current or a parabolic wave formed by a dedicated circuit. Furthermore, the shape of the magnetic piece provided around the electron beam is not limited to a ring shape.

It may be provided close to the periphery of the electron beam in a portion of the electron beam. On the other hand, although not shown in the examples, if the beam spot at a location other than the center of the fluorescent surface is corrected to a circular shape by static means such as a permanent magnet, the beam spot at the center of the fluorescent surface may be is an ellipse with its long axis in the horizontal direction. In this case, the beam spot at the center is generated by reversing the direction of the quadrupole magnetic field shown in the example.

can be corrected into a circular shape.

〔Effect of the invention〕

According to the present invention, the beam spot distortion caused by the self-convergence type deflection yoke can be easily corrected without causing misconvergence, and the beam spot diameter at the peripheral portion of the fluorescent surface can be reduced. Can reproduce images with good resolution and convergence performance.

[Brief explanation of the drawing]

FIG. 1 (α) is a schematic diagram of a device showing the first embodiment of the present invention, FIG. is a circuit diagram in which current flows outside of the implementation shown in Figures 1(α) and (b), Figure 1(d) is a circuit diagram of Figure 1(C)K
1 is a current waveform diagram of each part of the circuit shown in FIG. 2 is an explanatory diagram of the main part of the first embodiment shown in FIG. Figure 5 is a diagram showing the shape of the electron beam, and is a schematic diagram showing the shape of the beam spot on the bottom surface of the pot.
FIG. 5(α) is a schematic diagram showing the appropriate operation of the present invention, FIG.
A) After application of the present invention. FIG. 4 is a cross-sectional view of a main part showing a second embodiment of the present invention, FIG. 5 is a cross-sectional view of a main part showing a fifth embodiment of the present invention, and FIG. FIG. 6(eL) is a schematic diagram of the device of the fourth embodiment, and FIG. 6(b) is a diagram showing the fourth embodiment.
Figure 6 ((7) B-B cross section. Figure 6 (C) is a CC line cross-section of Figure 6 (α),
iI6 (Cd) is a block diagram showing the tangential state of the circuit that supplies current to the embodiment, and Figure 6 (=), Figure 6 (f), and Figure 6 (!I) are shown in Figure 6 (tL). Current waveform shown. Figure 7(8) and Figure 7(b) are respectively Figure 6Cb.
), FIG. 6(c) is an explanatory diagram of the main part, FIG. 8 is a sectional view of the main part showing the fifth embodiment of the present invention, and FIG.
FIG. 8(b)1 is a sectional view taken along line C-C in FIG. are explanatory diagrams of the main parts of Figures 8 (α) and (b), respectively.
Figure 0 (α) and Figure 8 (α) and Figure 11 are schematic diagrams showing the shape of the beam spot on the fluorescent surface obtained by the present invention, respectively. 1R,
IG, iB: Electron gun, 2: Electron gun groove, 5: Force 2 - cathode ray tube, 4: Deflection yoke, 6, 6α, 6b: Correction coil, 7, 7α, 7b: Ball piece, 8: Magnetic pole, 10 ．． . 10α, 10A, IDc, 1[1d: Magnetic field created by correction coil, 11: Diode bridge, 12: Horizontal deflection coil, 15: Horizontal deflection circuit, 14α, 14A: Deflection force, 15: Fluorescent surface, u, 16a, ub: magnetic core, 17
a, 17b: Parabolic wave light. Stopper, 18: Adder, 19R, 19B, 19G: f
B-type body piece, 20: Induced magnetic field, 21R, 21G, 21B
: Deflection force, 22: Beam spot, 25: Amplifier, 50
: Shadow mask, 51: Fluorescent surface. Part I (C) (d) Easy 2fl
Island 31! 1! 89 evil,. Taran O concave 1st country

Claims (1)

[Claims] 1. In-line arrangement 3 arranged in the neck of the picture tube
In a color picture tube device having a fluorescent surface provided at a position facing the electron gun and the neck portion, and a shadow mask provided in front of the fluorescent surface, an electron gun assembly that integrally holds the above three electron guns. A correction coil is provided on the outer periphery of the neck of the color cathode ray tube that surrounds the neck of the color cathode ray tube, and has a correction coil that forms at least 12 magnetic poles in total toward the neck of the color cathode ray tube, and one end faces each of the magnetic poles, and the other end faces the electron An in-line color picture tube device characterized in that an electron gun assembly is provided with a ball piece that is disposed close to a diagonal of the beam and forms a quadrupole magnetic field for each of the three electron beams. 2. The correction coil includes a first correction coil having four magnetic poles attached to one side of the outer periphery of the neck of the color cathode ray tube at two locations separated in the electron beam traveling direction, and a first correction coil having four magnetic poles attached to the other side. a second correction coil having magnetic poles, and the ball piece is provided in the electron gun structure in correspondence with the first correction coil, and forms a quadrupole magnetic field for the electron beam at the center of the in-line arrangement. a first group of ball pieces that correspond to the second correction coil, and a second group of ball pieces that are provided in the electron gun structure in correspondence with the second correction coil and form a quadrupole magnetic field for each of the electron beams on both sides of the in-line arrangement. An in-line color picture tube device according to claim 1, characterized in that the in-line color picture tube device comprises: 3. In-line array 3 located in the neck of the picture tube
In a color picture tube device having a fluorescent surface provided at a position facing the electron gun and the neck portion, and a shadow mask provided in front of the fluorescent surface, an electron gun assembly that integrally holds the above three electron guns. A first correction coil having four magnetic poles and a second correction coil having eight magnetic poles are provided on the outer periphery of the neck of the color cathode ray tube surrounding the tube, with one end attached to each magnetic pole of the first correction coil. a first group of ball pieces facing each other, the other end of which is disposed close to the diagonal part of the central electron beam of the three electron beams, and forming a quadrupole magnetic field with respect to the central electron beam; A first magnetic body provided close to the ball piece and close to the electron beams on both sides of the three electron beams, and a second correction coil each having one end facing the respective magnetic poles of the three electron beams. The other end is placed close to each diagonal of the electron beam on both sides of the
A second group of ball pieces that form a quadrupole magnetic field for each electron beam on both sides, and a second group of ball pieces provided close to the second group of ball pieces and close to the central electron beam of the three electron beams. An in-line color picture tube device characterized in that a second magnetic material is provided in an electron gun groove body.