JP2784301B2 - Color cathode ray tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color CRT device, and more particularly to a convergence correction device for an in-line self-convergence type color CRT.

[0002]

2. Description of the Related Art A schematic structure of an in-line self-convergence type color CRT is shown in FIG. 1 is a color cathode ray tube main body, a panel 3 having a fluorescent screen 2 formed on the inner surface.
And a substantially cone-shaped funnel 4 connected to the panel, and a cylindrical neck 5 connected to the funnel 4. Reference numeral 6 denotes an electron gun provided in the neck portion 5, which generates three electron beams in-line (one horizontal line) around the tube axis of the neck portion 5. Reference numeral 7 denotes a base for supplying an operating voltage to the electron gun 6. Reference numeral 8 denotes a shadow mask disposed opposite to the fluorescent screen 2, and selectively irradiates three electron beams from the electron gun 6 onto phosphors that emit red, blue, and green colors forming the fluorescent screen 2. It is for making a collision.
Reference numeral 9 denotes a deflection yoke arranged on the outer periphery of the joint between the funnel 4 and the neck portion 5 for deflecting the electron beam over the entire area of the phosphor screen 2 and converging the three electron beams. Reference numeral 10 denotes a convergence purity magnet (hereinafter, referred to as a CP magnet) attached to the neck 5 so as to surround the electron gun 6 behind the deflection yoke 9.
The color purity and static convergence of the three electron beams from the electron gun 6 are adjusted at the center of the phosphor screen 2.

FIG. 9 shows a schematic structure of a CP magnet 10, in which three sets of a pair of ring-shaped magnets, ie, two-pole magnets 11a, 11b, four-pole magnets 12a, 12b, six-pole magnet 13a, 13b and spacers to regulate the gap between each pair of magnets
14a, 14b, 14c, and 14d. The whole ring is prevented from rotating by a retaining ring 15, and the whole is fixed to the neck portion 5 by tightening a screw 16.

In FIG. 8, in order to project an image on the panel 3, three electron beams emitted from the electron gun 6 are deflected by the deflection yoke 9 over the entire screen, and arbitrary holes of the shadow mask 8 are formed. Must be correctly focused on the phosphor on the phosphor screen 2 determined through the above, and focused on the entire screen. In the self-convergence type color cathode ray tube, the convergence of three electron beams in the peripheral portion with respect to the center of the screen (convergence) requires special correction from the outside if the magnetic field distribution of the deflection yoke 9 is appropriately determined. There is no.

In this case, the color purity of the entire screen is adjusted by C
This is performed by the two-pole magnets 11a and 11b of the P magnet 10. The bipolar magnets 11a and 11b have a magnetic pole configuration as shown in FIG. 10, and can change the strength of the magnetic field by the mutual opening angle, and can change the direction of the magnetic field by setting both rotation angles.
Therefore, by adjusting the two-pole magnets 11a and 11b,
By moving the three electron beams in the same direction by the same amount in the entire area of the screen, it is possible to correctly hit the defined phosphor through an arbitrary hole of the shadow mask. Meanwhile, 4
The pole magnets 12a and 12b and the six-pole magnets 13a and 13b have the magnetic pole configurations shown in FIGS. 11 and 12, respectively. The strength of the magnetic field is changed by the mutual opening angle, and the magnetic field is set by setting the entire rotation angle. Direction can be changed. Therefore, a four-pole magnet 12
By setting a and 12b, the electron beams (corresponding to red and blue) only on both sides of the electron gun 6 are moved by the same amount in different directions over the entire screen, and only the both sides of the electron gun 6 are moved as shown in FIG. Convergence of the electron beams (red, blue). Further, the electron beams (red and blue) only on both sides of the electron gun 6 are moved by the same amount in the same direction over the entire screen by the six-pole magnets 13a and 13b, and as shown in FIG. (Red, blue) and the central electron beam (green).

Thus, the two-pole magnets 11a, 11b,
The color purity and convergence over the entire screen can be adjusted by the 12a, 12b, and 6-pole magnets 13a, 13b. After the adjustment is completed, the retaining ring 15 is tightened and the entire CP magnet 10 is fixed. . However, in the color cathode ray tube of the in-line self-convergence system, since the emission port of the electron beam of the electron gun 6 is arranged in-line around the neck tube axis, for example, the heat of the electron gun 6 and the CP magnet 10 due to changes, an electron beam of both sides as shown in FIG. 13 is often deviated in the lateral direction.

[0007]

The conventional color cathode ray tube is constructed as described above.
If the convergence shift occurs after the magnet 10 is adjusted and fixed, the stop ring 15 must be loosened and adjusted again.If the magnet 10 is incorporated in a TV set or a computer display monitor set, readjustment work must be performed. It was difficult to do. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a color CRT device provided with a convergence correction device capable of easily correcting a convergence deviation from the outside. .

[0008]

A color cathode ray tube apparatus according to the present invention is formed in a color cathode ray tube main body with three electron beams which are arranged in an annular shape around a neck portion and are emitted in-line around the neck tube axis. in addition to the convergence device for focusing on fluorescent surface, the neck outer
At equal intervals along the inner circumference of the convergence device
Has four coils arranged in each of the adjacent coils
Generate the same amount of magnetic field in different directions, centering around the neck tube axis
To generate a four-pole magnetic field,
Ash includes a convergence correction apparatus adapted to correct
Nodea Ru.

[0009]

[Function] The convergence correction device is provided around the neck portion .
The four coils arranged at equal intervals along the inner periphery of the convergence device, the by generating a magnetic field in the same amount and opposite direction to generate a quadrupole magnetic field centered on the neck tube axis Rukoto, correcting the defocusing of each side electron beam with respect to the central electron beam, a color cathode ray tube even when incorporated in a television set, it is easily row Ukoto readjustments convergence from the outside.

[0010]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention, in which a CP magnet 10 has three sets of magnets, that is, a two-pole magnet.
11a, 11b, 4-pole magnets 12a, 12b, 6-pole magnets 13a, 13b
And spacers 14a, 14b, 14 for regulating the magnet spacing of each set.
c, it is composed of a 14d, co and that to prevent rotation of the entire the stop ring 15 is secured across the neck 5 by tightening the screws 16, the point constituting the convergence device traditional device Is the same as

In FIG. 1, a convergence correction device 20 which is a feature of the present invention is mounted on the inner peripheral portion of the CP magnet 10 and is mounted together with the CP magnet 10 on the outer periphery of the neck portion 5 of the color cathode ray tube. Convergence correction device 20, as shown in detail in FIG. 2, the neck
Along the inner peripheral surface of the non-magnetic cylinder 21 attached to the outer periphery of the part ,
Four coils 22a, 22b, 22c, 22d wound spirally
Are arranged at equal intervals. And each coil 22
a, 22b, 22c, and 22d are connected in series as shown in FIG. 3 and are supplied with electricity from the outside through a connector 23 with a lead wire, so as to have the same direction and different direction as the coils adjacent around the neck portion of the color cathode ray tube. , And a quadrupole magnetic field centered on the neck tube axis.

Therefore, these coils 22a, 22b,
A four-pole magnetic field as shown in FIG. 4 is formed by the 22c and 22d with respect to three electron beams arranged in-line around the tube axis in the neck portion 5 of the color CRT. Therefore, by setting the magnetic field distribution by these coils, the electron beams (red and blue) on both sides of the electron gun 6 can be changed as shown in FIG.
By moving a predetermined amount in the directions a and b, the convergence deviation of the two-sided electron beam shown in FIG. 13 can be corrected.
Therefore, even after the color cathode ray tube is adjusted, for example, after being incorporated in a television or a display monitor, if a convergence deviation occurs, it can be easily corrected from outside.

FIG. 5 shows a convergence correction coil.
An example provided outside the convergence device is shown for reference . In this example, the convergence correction device 30 is C
Attached to the side of P magnet 10, CP magnet 10
Also attached to the neck part 5 of the color CRT. As shown in FIG. 6, the convergence correction device 30 has grooves formed at 90-degree intervals in a rectangular non-magnetic plate 31 having a through hole 31a at the center, and four coils 32a, 32 b, 32c, 32d and is obtained by respectively disposed, examples each coil 32a, 32b, 32c, the 32d described above
As shown in FIG. 7, when the coils are connected in series in the same manner as the respective coils and are energized from the outside through the connector 33 with a lead wire, a magnetic field in the same direction and different direction as the coils adjacent around the neck portion of the color cathode ray tube is generated. and is configured to generate a quadrupole magnetic field around the neck tube axis, both sides electron beams (red and blue) are made to allow correct convergence deviation from the outside.

[0014] In the above example, the case where the coils of the convergence correction device is arranged in a diagonal direction,
Orientation of its course, the number of turns and the coil, various ones seen for the presence or absence of the core inside the coil
It seems.

[0015]

As it is evident from the foregoing description, according to the color cathode ray tube apparatus of the present invention, four of the neck outer periphery of the color cathode ray tube main body, which is arranged to generate a quadrupole magnetic field around the neck tube axis The convergence correction device that supplies an electric signal to these coils from outside and corrects the convergence deviation of the electron beam is provided, so even if the convergence adjustment is completed once and incorporated into a TV set, etc. The convergence deviation can be easily corrected from outside.

In addition, the above structure of the present invention particularly has four
Coils are evenly spaced along the inner circumference of the convergence device
Since it is arranged and configured to generate the same amount of different magnetic field in each adjacent coil, the convergence deviation in the in-line color CRT can be controlled by external signal operation without making any special changes to the conventional device. Correction can be made easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a convergence correction device which is a feature of the present invention.

FIG. 3 is a circuit diagram showing an example of a method of connecting coils of the convergence correction device in FIG. 2;

FIG. 4 is a diagram illustrating the operation of the convergence correction device of FIG. 2;

FIG. 5 shows a convergence correction coil.
It is a reference drawing showing the example provided outside the storage device .

[6] approximate showing a configuration of a convergence correction apparatus of FIG. 5
It is a schematic diagram.

FIG. 7 is a diagram illustrating the operation of the convergence correction device of FIG. 6;

FIG. 8 is a side view showing a schematic structure of a conventional color cathode ray tube.

FIG. 9 is a main part side view showing a conventional convergence device.

FIG. 10 is a diagram illustrating the operation of a two-pole magnet in a conventional convergence device.

FIG. 11 is a diagram illustrating the operation of a four-pole magnet in a conventional convergence device.

FIG. 12 is a diagram illustrating the operation of a six-pole magnet in a conventional convergence device.

FIG. 13 is a diagram showing a state of convergence of electron beams on both sides of the electron gun.

FIG. 14 is a diagram showing a state of convergence between a center electron beam and electron beams on both sides of an electron gun.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color cathode ray tube main body 2 Phosphor screen 3 Panel 4 Funnel 5 Neck 6 Electron gun 7 Base 8 Shadow mask 9 Deflection yoke 10 CP magnet 11a, 11b 2-pole magnet 12a, 12b 4-pole magnet 13a, 13b 6-pole magnet 14a, 14b, 14c, 14d Spacer 15 Stop ring 16 Screw 20 Convergence correction device 21 Non-magnetic cylinder 22a, 22b, 22c, 22d Coil 23 Lead wire with connector 30 Convergence correction device 31 Non-magnetic plate 31a Groove 32a, 32b, 32c, 32d Coil 33 Lead wire with connector

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Claims (1)

(57) [Claims] 1. An electron gun which is arranged in a neck portion of a color cathode ray tube main body and generates three electron beams in-line around a neck portion tube axis. A convergence device for converging the electron beam on a phosphor screen formed on the color cathode ray tube main body ;
Four cores arranged at equal intervals along the inner circumference of the
And generate the same amount of magnetic field in different directions in each adjacent coil
By, of generating a four-pole magnetic field around the neck tube axis
And a convergence correction device adapted to correct the defocusing of the electron beam.