JPS6023937A - Picture correction device of inline type color picture tube - Google Patents

Abstract

PURPOSE:To form small size and light weight magnet and thereby the entire part of picture tube by providing a pair of magnets in the side of screen among two pairs of 4-pole magnets adjacent to the side end of gun of deflection yoke. CONSTITUTION:The 4-pole magnet 8-2' in the screen side among two pairs of 4-pole magnets 8-1, 8-2' is provided adjacent to the end surface of separator 12 of deflection yoke 5' in the more screen side than the tightening band 9, namely to the side end part of three guns of deflection yoke 5'. Thereby, distance l' between the 4-pole magnets 8-1, 8-2' becomes considerably large as compared with the existing device. In case there is a rotating error of horizontal axis of three guns and the horizontal axis of deflection yoke 5', the static convergence can be taken by two pairs of 4-pole magnets 8-1, 8-2', but since the distance l' is large, a large amount of magnetization is not required for the magnets 8-1, 8-2' and these magnets can be formed small in size and thereby the total size of device can be also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image correction device for an in-line control two-picture tube.

PRIOR ART In general, in an in-line control picture tube of a television receiver, color display device, etc., R (RED) is emitted from three electron guns (3 guns).
), a (apxgN), and B (BIIUK) need to be focused and concentrated (convergence) on the screen of the picture tube at mutually different angles of incidence.

For this reason, in the conventional in-line 3-gun color picture tube, in order to obtain good concentration of the 3-electron beams on the screen, the water deflection magnetic field of the deflection yoke provided on the 3-gun and the screen LH1 is used. A strong bottle-cushion-shaped (pincushion-shaped) magnetic field and a vertical deflection magnetic field are formed into a strong barrel-shaped (beer barrel-shaped) ffi field, and these magnetic fields change the traveling directions of the three beams with different incident angles on the screen. I try to focus on the match.

However, due to assembly technology, it is difficult to match the horizontal axis of the in-line 3-gun and the horizontal axis of the deflection yoke magnetic field in advance, and if this continues, the above concentration (convergence) will not be possible and a three-color image will be generated. In order to solve this problem, conventionally, a magnet was further installed between the three guns and the deflection yoke to correct the misconvergence. , hereafter this conventional example (% Kosho 57-302
629 Publication ``Convergence Device'') Figure 1,
In FIG. 1, a picture tube assembly 1 is attached to a neck 2b of a picture tube 2 (having a screen 2a and a neck 2b) with three guns 3 (3 -R, 3-G, 3-B), a static convergence device 4, and a deflection yoke 5.The static convergence device 4 includes two sets of two-pole magnets 6 and one set of six-pole magnets 7. The 2-pole magnet 6 is used for adjusting the color purity in the center of the screen, and the 6-pole magnet 7 is used for adjusting the color purity in the center of the screen.
It is used to adjust the convergence of the center electron beam (G) and both side electron beams (R, B) from the center.

Also, the two sets of quadrupole magnets 8-1' and 8-2 are magnetized in advance to generate a quadrupole magnetic field, as shown in Fig. 2, and this magnetic field causes electron beams R9B on both sides of the horizontal axis to be generated. Each set of magnets 6.7.8-1.8-2 is a set of two magnetic plates, which generate forces acting in opposite directions. By changing their mutual rotation angles, the amount of movement of the electron beam can be changed, and by rotating one or two magnet plates in the same direction, the y! of the electron beam can be changed. 411 direction can be changed arbitrarily.

Here, inline 3 guns 3-R, 3-G, 3-B
When the horizontal axis of the deflection yoke 5 is rotated counterclockwise by an angle θ1 with respect to the horizontal axis of the deflection yoke 5, the beam R and the beam B pass through the upper and lower paths with respect to the z-axis, respectively, as shown in FIG.
As shown, the horizontal axes of the three beams R, G, and B are at the above rotation angle θ.
Proceed while keeping 1. And 4-pole magnet) 8-
1.8-2, the beams R (red), G (green), and B (blue) are each deflected by the horizontal deflection magnetic field U of the deflection yoke 5 (see Fig. 3). 'HR'HG l
'VRI VG l 'VB receives the deflection direction force of 'HB and the vertical deflection magnetic field V. Moreover, on the blue horizontal line, a misconvergence t-R occurs in which both sides jump up.

However, if there are 4-pole magnets 8-1 and 8-2, the beam R emitted from the gun 3-R in FIG. According to the principle, the beam B receives a downward force and advances in the direction R'', and the beam B emitted from the gun 3-B in the same figure is also directed upward by the first quadrupole magnet 8-1. After receiving the force, the beam R1 moves in the direction of Bo. Then, the beam R1 in FIG. polar magnet 8-2
This time, they receive the downward sword and proceed in the directions R" and B1, respectively. As a result, the three electron beams R, G, and B are concentrated in the center of the screen 2a and are in a hanging state. As a whole, as shown in FIG. 5 (cross-sectional view at position T in FIG. 4), the horizontal axes of the beams R+' a and B are at a small angle θ2 with respect to the horizontal axis of the magnetic field of the deflection yoke 5 (however, θ2<θ1 ) is corrected to the left-rotated state, that is, the static convergence device enters the magnetic field of the deflection yoke 5 at position T in FIG. 4.Then, the beams R, G,
B is dynamically converged by the magnetic field of the deflection yoke 5 so that it is concentrated on the screen 2a over the entire peripheral area excluding the center of the screen 2a, and the misconvergence shown in FIG. 3(B) is corrected.

Here, the horizontal axis rotation correction value △v(2θ1−θ
2) is given by the following equation.

However, W...In Figure 5, the distance between beams R, G, and B is S.
...Beams R and G before reaching position P in Figure 4.

Vertical dimension difference M between B...In Figure 4, the distance between the P position and the intersection of the two axes and the beam (magnetic) 8-1.Inversely proportional to the magnetic field strength of 8-2) l...2 sets 4-pole magnet) 8-1. Distance between 8-2 L...Distance a between P position and screen 2a...Distance between Q position and T position Here, once the shape of the picture tube 2 is determined, , above (W in formula 1
, S, and l+a are approximately determined, so the maximum correction amount Δθ is M (inversely proportional to the magnetic field strength), that is, the amount of magnetization of the magnet 8-1.8-2, and the magnet 8-1. 8-
It will be determined by the distance l between the two. The relationship between the maximum correction amount △θ and the distance l is approximately proportional as shown in FIG.
It can be seen that it is advantageous to increase .

However, in the conventional inline type 3-gun color picture tube, the tightening pad 9 of the deflection yoke 5 in Fig. 1 gets in the way, and the movable range of the deflection yoke 5 for color purity adjustment must be considered. Therefore, it was not possible to take a sufficient distance l. Therefore, in order to obtain a sufficient maximum correction amount Δθ, the amount of magnetization of the magnet) 8-1.8-2 must be increased, and as a result, the amount of magnetization of the magnet) 8-1.8-
2 has the disadvantage that it becomes large in size, and since the amount of magnetization is large, it becomes sensitive to shocks and changes in environmental conditions, and the convergence after adjustment often deviates.

Means for Solving the Problems The present invention solves the above drawbacks by providing one set of magnets on the screen side of the two sets of four-pole magnets at the end of the deflection yoke on the three-gun side, and setting the above-mentioned distance l large. An object of the present invention is to provide an image correction device for an in-line color picture tube that eliminates this.

The configuration for this includes a color picture tube, three in-line guns, a deflection yoke that deflects the three beams from the three guns and concentrates them on the screen of the picture tube, and a color picture tube arranged between the three guns and the deflection yoke. , two sets of quadrupole magnets for correcting the minuconvergence of the concentration caused by a rotational error between the horizontal axis of the three guns and the horizontal axis of the deflection yoke; A set of magnets on the screen side is provided adjacent to the end of the deflection yoke on the three gun side, and a distance between the two sets of magnets is set to be relatively large to sufficiently perform the above correction. This is the structure.

Embodiment FIG. 1 is a side view of a picture tube assembly to which an embodiment of the in-line color picture tube image correction device of the present invention is applied, and FIG. 6 is an exploded perspective view of the image correction device.
In FIG. 7, the same parts as in FIG. 1 are given the same reference numerals, and their explanation will be omitted.

In the figure, the deflection direction 5' of the picture tube assembly 11 is determined by a vertical coil 14 and a horizontal coil (not shown) arranged between both ends 12 and 13 of the separator.
As shown in FIG. 8, there is a negative boss portion 12a (defined into a plurality of parts by a plurality of axial notches 12b equally spaced in the circumferential direction) on the outside and a plurality of engagement arm portions 12c that are equally spaced in the circumferential direction. and has. The deflection yoke 5'' of the present application has approximately the same shape as the conventional deflection yoke 5, but the axial length of the boss portion 12a is slightly longer than the conventional one in order to attach the 4-pole magnet l-8-2', which will be described later. The deflection yoke 5' is fitted into the neck 2b of the picture tube 2 as shown in FIG.

Two sets of 4-pole magnets) 8-1.8-2', one set of 4
The pole magnet 8-2' has a larger diameter than the conventional magnet 8-2, and as shown in FIG. 12c with elastic deformation of each arm portion 12c, and is brought into contact with the rear end surface 72 of the separator, and is locked by the distal end claw portion of each arm portion 12c. Four-pole magnet 8-2
' can be assembled and disassembled with one touch.

Reference numeral 9 denotes a tightening pad, which is formed by threading a screw 9b onto a band 9a, and tightens the screw 9b while being loosely fitted into the boss portion 12a. As a result, the plurality of portions of the boss portion 12a are elastically deformed inward, and the deflection yoke 5'' is tightened and fixed to the neck 21:I.

The other mounting positions of magnets l-6, l-8-1, and l-7 are the same as in the conventional example.

Therefore, in the configuration of the present application, two sets of quadrupole magnets 8-1
．． Of 8-2', 4-pole magnet 8- on the screen side
21 from the tightening band 9 and the end face of the separator 12 of the deflection yoke 5+ on the screen side, that is, the deflection yoke 5'. Since it is provided adjacent to the + end, the distance l'' between the four-pole magnets 8-1, 8-2' is the same as the conventional size l.
(t''>t).

Also in this application, 3 guns 3. When there is a rotational error between the horizontal axis of 3-G and 3-fB and the horizontal axis of the deflection yoke 5', two sets of quadrupole magnets 7) 8-1 are used as in the conventional example.
．． 8 to 2' VC, you can get a systatic convergence.

In this case, for the above-mentioned reason, the value of l'', which corresponds to l in the above formula (1), can be taken to be considerably thicker than in the conventional example (about 15 m), up to about 30 m+n, and can be approximately doubled. Conversely, the amount of magnetization of the magnet 8-1° and 8-2° can be reduced to that of the conventional example, and in this state, a sufficient maximum correction amount Δθ can be obtained. -1.8-2' can be made smaller, the whole can be made smaller, and since the amount of magnetization of the magnet 8-1.8-2° is small, it is 37/(- sense ( 1)
Vine reduces change.

As described above, according to the image correction device for an in-line color picture tube according to the present invention, of the two sets of quadrupole magnets, one set of magnets on the screen side is brought into instantaneous contact with the end of the deflection yoke on the three-gun side. The distance between the two sets of 4-pole magnets is set to 1/3, and the above-mentioned valley magnet is used.
When correcting misconvergence caused by rotational errors in the horizontal axes of the gun and one flat yoke, the amount of magnetization of each magnet can be reduced, making the magnets and the entire structure smaller and lighter, as well as reducing impact and debris. It has the advantage of being able to improve performance under changes in conditions without causing a decline in temo convergence, and has extremely high industrial value.

[Brief explanation of drawings]

Figure 1 is a side view of a picture tube assembly to which a conventional example of an in-line color picture tube image correction device is applied, Figure 2 is an explanatory diagram of the magnetic field of the quadrupole magnet of the picture tube assembly, and Figure 3 (5). + (BJ is a diagram for explaining the magnetic field of the deflection yoke of the picture tube assembly and a diagram for explaining the misconvergence state in the screen, respectively; FIG. 4 is a side view for explaining the entire operation of the picture tube assembly; and FIG. The figure is a diagram explaining the state in which the beam enters the deflection magnetic field in the picture tube assembly, and Figure 6 shows the rotation of the horizontal axis of the three beams emitted from the three guns in the picture tube assembly from the horizontal axis of the three guns. Diagram 1 illustrating a state in which the amount of correction changes depending on the separation distance between two sets of quadrupole magnets.
The figure is a side view of a picture tube assembly to which an embodiment of the in-line color picture tube image correction device according to the present invention is applied, and FIG. 8 is an exploded perspective view of the image correction device. 1.11... In-line color picture tube assembly, 2... Picture tube, 3 (3-R, 3-G, 3-B)
...3 guns, 4, 41...static conharsenne device, 5.5'...deflection yoke, 8-1, 8
-2, 8-2'...4-pole machinet, 9...tightening band, 12...separator, 12a...boss portion, 12b...engaging arm portion. 18r Fig. 2 N Fig. 3 fAl tBl Fig. 4

Claims (1)

[Claims] A color picture tube, an in-line type 3 gun, and a deflection yoke that deflects the 3 beams from the M3 gun and concentrates them on the null screen of the picture tube, and a deflection yoke arranged between the 3 guns and the deflection yoke, Two sets of quadrupole magnets for correcting the above-mentioned concentration misconvergence caused by a rotational error between the axis and the horizontal axis of the deflection yoke; a magnet is provided adjacent to the end of the three guns side of the deflection yoke, and the hW distance between the two sets of magnets is set relatively large,
An image correction device for an in-line color picture tube, characterized in that it is configured to sufficiently perform the above correction.