JPS5951443A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To eliminate a mislanding caused by a dynamic differential coil device, by setting a position for setting up the dynamic differential coil device to a core so as to become a specific positional relationship. CONSTITUTION:An electron beam 100G emitted out of an electron gun 7G at the center varies its path as shown in (a)-(c) according to the position of a dynamic differential coil device 14 so that even if a magnetic field of the dynamic differential coil device 14 exists there, an installing position of the coil device is in existence. Assuming that a distance in the axial direction of a core 21 is set down as L, while a distance from the center of the coil device to the rear end of the core 21 is set down as l, the ratio of l to L is set to be 1/6<(l/L)< 2/3, if possible, it is desired so as to have a relationship of 1/5<(l/L)<1/2. With this, a mislanding phenomenon caused by the dynamic differential coil device can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color cathode ray tube having a dynamic differential coil arrangement.

A conventional device of this type is shown in FIG. 1 (4). In FIG. 1Q, a color cathode ray tube (1) consists of a panel (2) on which an image is projected, a cone-like funnel (3), and a cylindrical neck part (4). These are glued together to form an envelope whose interior is kept open.

On the inner surface of the panel (2), phosphors that emit light in multiple colors, generally red, green, and blue, are regularly arranged, and each phosphor has a phosphor surface (5 ) is formed. A shadow mask (6) made of a metal plate having numerous regular holes is disposed facing the fluorescent surface (5) and spaced apart from it by a predetermined distance. An electron gun assembly (7) that generates eight electron beams is located in the E neck section (4).
) are arranged, and the electron gun assembly (7) includes unit electron guns (7R), (7G), (7B) that generate one electron beam.
) (hereinafter referred to as electron gun), with individual electron guns (7R), (
7G), (7B) are tube axes (center line of neck part (4))
The electron gun (7G) passing through the tube was placed symmetrically to the tube axis. 2
It consists of two electron guns (7B) and (7R).

In addition, the electron guns (7G), (7B), and (7R) have their corresponding electron beams (100G), (100B), and (100R) undeflected, as shown in Figure 1 (4). The fluorescent light is arranged at a slight inclination so that it sometimes travels straight and concentrates on one point in the center of the fluorescent surface (5). Since it is generally difficult to mechanically position this tilt angle with high precision, a magnet device (not shown) is used to compensate for this tilt error.
is provided on the outer periphery of the neck portion (4) near the peripheral portion where the electron gun assembly (7) is arranged. (10)
is a deflection yoke that deflects the electron beam, and is attached to the connecting part of the funnel part (3) and the neck part (4).

This deflection yoke (10) consists of two sets of coils that deflect the electron beam (100) in two directions, horizontally and vertically, one with a saddle type for horizontal deflection and the other with a toroidal type for vertical deflection. A line is used.

By the way, when operating a cathode ray tube, when the electron beam (100) is deflected by the deflection yoke (10), the electron beam (100G) emitted from the central electron gun (7G) is deflected. It is easy to reach the desired position, but the electron guns (7B) and (7R) on both sides
It is difficult to deflect the electron beams (100B) and (100R) from the fluorescent surface (5) to a predetermined position.

For example, in a case where the deflection yoke (10) is used to set a magnetic field in which the magnetic flux density is uniformly distributed for horizontal and vertical deflections, that is, a so-called uniformly distributed magnetic field, the scanning situation of the electron beam (100) is as follows. The result is as shown in FIG. In the figure, the broken line (6) indicates the electron beam (
100B), and the solid line (9) shows the red electron beam (100R).

As is clear from the figure, the concentration state (deflection amount) of the electron beam can be roughly classified into eight malfunctions.

First, when the electron beam (100) is deflected horizontally, the red (2) and blue [F]) vertical lines shift horizontally as the amount of deflection increases, and there is an error between them by a width t1. The disadvantage is that this occurs.

Second, when the electron beam (100) is deflected in the vertical direction, the vertical lines of red (■) and blue (2) shift horizontally as the amount of deflection increases, and intersect with each other on the fluorescent surface (5). An error occurs by the width L3.

Eighth, the electron beam (100) is directed both horizontally and vertically (
When deflected in the diagonal direction), the horizontal lines of red @) and blue @) tilt vertically as the amount of deflection increases, resulting in a width of 1.5 mm at the fluorescent surface (5). This will result in errors.

In order to eliminate errors during L start-up, the magnetic field generated by the deflection yoke (lO) is set not to be uniform, but to be so-called non-uniform. That is, as shown in FIG. 8, the horizontal deflection magnetic field is set to have a bottle cushion type distribution (solid line) (101), while the vertical deflection magnetic field is set to a barrel type distribution (broken line) (102).

As a result, the first concentration error 1. , 1. can be removed, but the amount of the eighth concentration error t3 cannot be completely removed, and a pattern concentration error as shown in FIG. 4 (4) @ still occurs.

Conventionally, a dynamic differential coil device is known as a device for correcting this. First, the principle of this device will be explained. In FIG. 5, (11a), (llb)
is a pair of horizontal deflection coils, both of which have the same shape and the same inductance. Both coils (lla)
, (llb) are connected in parallel via the differential coil (12), and the terminals H1 and H! Deflection power supply (not shown) through K
It is connected. (18) is a slider, and the differential coil (1
2) It is provided so as to move continuously from the upper end to the lower end. Here, for example, when the slider (1B) is located at the center of the differential coil (12), the distribution of the magnetic field is the same as without the differential coil (12), but the slider (1B) is located at the center of the differential coil (12).
1B) is located at the upper end (18a), the current in the horizontal deflection coil (11a) on the L side flows into the horizontal deflection coil (1B) on the lower side.
l b) becomes larger, and on the fluorescent surface (5)E, the right side of the red @) horizontal line moves toward L and the left side moves downward, so the concentration error between the red (9) and blue 03) horizontal lines is corrected.

On the other hand, the concentration error at the lower part of the fluorescent surface (5) in Fig. 4 [F]) can be solved by moving the slider (1B) to the lower end (18b), so the operation is opposite to that described. Corrected in the same way.

Therefore, when the electron beam is scanning the upper part of the fluorescent surface (5), the slider (1B) is placed at the upper end (18a).
When scanning the lower part, the start-up error can be corrected by using a circuit that performs the same function when placed at the lower end (18b).

In addition, when the concentration error is as shown in Fig. 4 @), the amount of deflection under L of the electron beam (100) and the slider (
A circuit is used that operates so that the relationship of the lower L position in 18) is reversed.

Next, a dynamic differential coil device using the principle described above is shown in FIG. In FIG. 6, (11a), (l
lb) is a pair of horizontal deflection coils that are wound around the core (21) and have a symmetrical shape down the hill; (20a) and (20b) are wound around the core (21) in a toroidal shape; A pair of vertical deflection coils. (14) is a differential coil device, and this device (14) has saturable cores (15a) and (15b) installed on both sides of the core (21) and facing each other. This saturable core (15a)
, (15b) are respectively wound on the differential coils (16a
), (16b), and a permanent magnet (17m), (1
7b,).

Now, when the concentration error to be corrected is that of Fig. 4 Q, the permanent magnets (17a) and (17b) are as shown in Fig. 7.
The outer part is magnetized to N pole, and the saturable core (15a), (15
b) Biasing a predetermined amount of magnetic flux in the direction indicated by KφM.

Now, when the electron beam is scanning the E direction of the fluorescent surface (5), the vertical deflection coils (20a) and (20b) generate the deflection magnetic flux φV shown by the arrow, and at the same time leakage magnetic flux φV' can occur. Pass through the saturated core (15). As a result, the magnetic flux passing through the 2@ saturable core (1.5m) on the left becomes φM + φV, while the saturable core (15m) on the cloth side
The magnetic flux passing through b) becomes φM-φV'. by the way,
The saturable core (15) is set to have appropriate saturation characteristics near the bias magnetic flux φM. Therefore, the inductance of the differential coils (16a), (16b) becomes small when the amount of magnetic flux passing through each saturable core (15a), (15b) is large, and vice versa.

Therefore, if the magnetic fluxes φM and φV are as shown in the figure, the inductance of the left-hand dynamic differential coil (14a) will be smaller by the leakage magnetic flux φV' than when there is no deflection magnetic flux φV. coil(
The inductance of 14b) becomes large. This is the fifth
A similar effect can be obtained by moving the L slider (18) shown in the figure to the upper end (18i), and the concentration error shown in FIG. 4 (4) can be corrected. On the other hand, when the electron beam is scanning below the fluorescent surface (5), the direction of the leakage magnetic flux φV is also reversed, so the dynamic differential coil (14sL) (1
4b) is also reversed, and the same effect as moving the slider (18) to the lower end (18b) in Fig. 5 is obtained. 5) It is possible to correct downward concentration errors. Furthermore, when vertical deflection is not performed, so to speak, when the leakage magnetic flux φV is zero, the inductances of the dynamic differential coils (1431) and (14b) are both equal.
) has no effect. Therefore, the concentration error shown in FIG. 4(4) is corrected over the fluorescent surface gold surface.

Here, dynamic differential coil (14@) *(14
b) is composed of two coils because the coil (
In order to prevent the inductance of the DynaS differential coils (14a) and (14b) from changing due to the horizontal deflection current flowing through 16), the horizontal deflection and vertical deflection circuits are preferably coupled through leakage magnetic flux φV, etc. This is to prevent unnecessary phenomena from occurring.

In addition, if the concentration error pattern is of the type shown in FIG. 4 [F]), the permanent magnets (17a) and (1) in FIG.
The polarity of 7b) may be reversed.

By the way, in this dynamic differential coil (14),
Permanent magnet (17a) used for bias.

(17b) has the disadvantage that a mislanding phenomenon occurs. That is, as shown in FIG. 8, since the permanent magnets (17a) and (17b) are placed near the deflection yoke (lO), part of their magnetic flux φM affects the electron beam (100). give. Electron beam (1
00) passing through the center of the tube axis, there is almost no effect, but if the horizontal deflection coil (11) is a saddle shape and the vertical deflection coil (20) is a toroidal shape, it is a so-called semi-loidal shape. In the case of deflection yoke, the backward magnetic flux from the vertical deflection magnetic flux affects the electron beam (100), and by the time it reaches the vicinity where the permanent magnets (17a) and (17b) are arranged, it has already become as shown in FIG. It is bent as shown. For this reason, permanent magnets (17a), (17b
) is further deflected in the direction of the arrow by the magnetic flux φM,
If it does not reach a predetermined position on the fluorescent surface (5), a slanting phenomenon occurs.

In the conventional device, no particular measures have been taken to eliminate the above-mentioned mislanding phenomenon, and from the viewpoint of structural support strength, the core (2
1) was attached to the rear end.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and by specifying the mounting position of the dynamic differential coil device with respect to the core, it is possible to eliminate the electric slanting phenomenon caused by the dynamic differential coil device. The purpose is to provide a color cathode ray tube device.

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

Figure 9 shows the core (21) and the dynamic differential coil device (
14), and shows the positional relationship with the horizontal deflection coil (l
la), (llb) and vertical deflection coil (20m), (2
0b) is omitted. Here, if the axial distance of the core (21) is the distance from the center of the L1 dynamic differential coil device (14) to the rear end of the core (21), then
L and t particularly preferably have the following relationship.

The reason why the value of t/L is set to the above relationship is as follows. In FIG. 10, for example, the central electron gun (
Of the electron beams (100G) emitted from
It is assumed that what passes through point M of the shadow mask (6) reaches Pa of the panel (2) via a trajectory a in a normal state. However, when the Dynakit differential coil device (14) is attached to the rear end of the core (21), this device (
14), it will reach pb via the trajectory already shown by the broken line.
This causes a mislanding phenomenon. Similarly, a dynamic differential coil device (1) is provided at the front end of the core (21).
4) is also deflected in front of the core (21) and reaches Pc via trajectory C, resulting in a mislanding phenomenon.

Therefore, if we focus on the phenomenon L, the trajectory of the electron beam changes sequentially between states a and b depending on the position of the dynamic differential coil device (14). Even if a magnetic field of By investigating the facts, a dynamic differential coil device (
14) The relationship between L and t that can avoid the influence of the permanent magnet (17) has been determined.

The mislanding phenomenon described above may be caused to some extent by the correction lens used when printing the inner surface of the spring /l' (2) when using the mosaic element photography method when manufacturing the fluorescent surface (5). Correction is possible. However, the correction lens must have a complicated shape with asymmetrical left and right sides at the bottom of L, which is disadvantageous in terms of cost and accuracy. It can be dissolved into sugar and is also advantageous in terms of cost.

In the explanation given below, there are eight electron guns (7R).

Although (7G) and (7B) are arranged horizontally, the application of the present invention is not limited thereto. That is, the electron guns are arranged in a row, the electron beam is deflected in one direction by a saddle-shaped coil in the deflection yoke, and the deflection in the direction perpendicular to this is carried out by a toroidal coil in the deflection yoke. If the coil device is arranged in the same direction as the direction in which the electron guns are arranged, the same effects as in the embodiment described above can be obtained.

In addition, the permanent magnets (17m) and (17b) have saturable cores (
t5a) and (15b), but it may be placed between the saturable core (15) and the core (21).

Furthermore, permanent magnets for bias (17a), (17b)
may be a magnetomotive force source such as an electromagnet, and in this case, the coil connected to the DC power supply that generates the magnetic flux for the E bias may be wound around the saturable core (15) in the same way as the coil (16).

Additionally, the differential coil (16) is a horizontal deflection coil (11a).
, (llb) may of course be used in parallel. In this case, it is necessary to set the magnetization of the bias permanent magnet in the opposite direction. At this time, the horizontal deflection coil (lla),
(llb) may be connected in series to the deflection power supply.

As explained above, according to the present invention, mislanding caused by the dynamic differential coil device can be eliminated by defining the mounting position of the dynamic differential coil device with respect to the core.

[Brief explanation of the drawing]

Fig. 1 shows a color cathode ray tube device, Fig. 1 (At is a side sectional view, Fig. 1 @) is a sectional view showing the main parts, Fig. 2 is an explanatory diagram showing the basic pattern of concentration error, Figure 8 is an explanatory diagram showing the distribution of deflection magnetic flux, Figure 4 is an explanatory diagram showing the basic pattern of concentration error, Figure 5 is a circuit diagram explaining the principle of a dynamic differential coil device, and Figure 6 is an explanatory diagram showing the basic pattern of concentration error. The figure is a perspective view showing the dynamic differential coil device, FIG. 7 is an explanatory diagram explaining the operation of the device in FIG. 6, FIG. 8 is an explanatory diagram showing the operating state of the device in FIG. 6, and FIG. 1 is a side view showing a dynamic differential coil device according to an embodiment of the present invention; FIG.
Figure O is an explanatory diagram showing the operation of the present invention. (1)...Color cathode ray tube device, (2)...Panel, (3)...Funnel part, (4)...Neck part,
(5)... Fluorescent surface, (6)... Shadow mask, (
7)...electron gun, (10)...deflection yoke, (ll
a), (llb), (20a), (2ob)...[direction coil, (14)...dynamic differential coil device]
(15a), (15b)...Saturable core, (16m
), (16b) ...differential coil, (17a
), (17b) - magnetomotive force source (permanent magnet), (21
)...core, (100)...electron beam. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - (1 other person) 11 (A) (B) Figure 2 Figure 3 Figure 4 (A) (B) Figure 5 Figure 8 World 10th

Claims (1)

[Claims] (1) A panel having a fluorescent surface, a shadow mask disposed inside the panel, a neck section housing nine or more electron guns arranged in one direction, a panel marked b, and a neck section set forth below. and a deflection yoke attached near the connection between the neck and the funnel, the deflection yoke being attached to the core and deflecting the electron beam in two directions. It consists of a deflection coil consisting of a shaped coil and a toroidal coil, and a dynamic differential coil device connected to this deflection coil and attached to the core marked with G, to correct the amount of deflection of the electron beam.
This dynakitsuk differential coil device includes a saturable core wound with dynakitsuku differential coils arranged on both sides of the core and connected to the deflection coils, and a predetermined bias applied to the saturable core. If the axial length of the core (h) is Ll, the distance from the rear end of this core on the electron gun side to the dynamometer differential coil device (t), then A color cathode ray tube device characterized by: