JPH10255684A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube having an electron gun having uniform characteristic in which the holding force of a plate electrode to a multiform glass is improved without using a part such as reinforcing member to reduce the space change between adjacent electrodes. SOLUTION: In this color cathode-ray tube, a planting part to a multiform glass on the peripheral part of a plate part 17' having a number of electron beam passing holes is formed of the first planting parts 17a raised from the plate part 17' in symmetric positions with respect to each of the electron beam passing holes situated on both side parts of an electron beam passing hole, and second planting parts 17b raised from the plate part 17' in symmetric positions with respect to the electron beam passing hole situated in the center part, and the first planting parts 17a and the second planting parts 17b are planted on the multiform glass in positions differed in tube axial direction Z-Z.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode-ray tube, and more particularly, to a multi-foam glass in which a plurality of electrodes including at least one plate-like electrode having a plurality of electron beam passage holes formed on a horizontal plane are formed. The present invention relates to a color cathode ray tube provided with an electron gun fixed to a color cathode ray tube.

[0002]

2. Description of the Related Art A color cathode ray tube used as a television picture tube or a monitor tube of an information terminal has an electron gun for emitting a plurality (generally three) of electron beams at one end of a vacuum envelope. A phosphor screen in which phosphors of a plurality of colors (the same three colors) are applied in a mosaic shape on the inner surface of the end, and a shadow mask which is a color selection electrode disposed close to the phosphor screen are built in. A required image is displayed by two-dimensionally scanning a plurality of electron beams emitted on a horizontal plane, that is, in-line, by a magnetic field generated by a deflection yoke provided outside the vacuum envelope.

FIG. 4 is a cross-sectional view illustrating an example of the structure of a three-electron beam type color cathode ray tube to which the present invention is applied, wherein 1 is a panel section, 1a is a screen, and 2 is an in-line emitting three electron beams. A neck portion for accommodating an in-line electron gun to be connected, a funnel portion for connecting the panel portion and the neck portion, a fluorescent screen, a shadow mask, a mask frame, and an electron beam from an external magnetic field such as terrestrial magnetism. A magnetic shield for shielding, 8 a mask suspension mechanism, 9 an in-line type electron gun, 10 a deflection yoke externally provided in the transition region between the funnel section 3 and the neck section 2, and 11 an external part for correcting electron beam centering and color purity. A correction magnetic device, 12 is an internal conductive film for introducing a high voltage from a high-voltage terminal (not shown) installed through the funnel, and 13 is an operating voltage of the electron gun and a display signal. That stem 14 tension bands for blast contraction for tightening the connection area of the panel portion and the funnel portion, 15 is a getter for increasing the vacuum degree of the vacuum envelope.

In this color cathode ray tube, a panel 1, a neck 2 and a funnel 3 constitute a vacuum envelope, and an electron beam B (a central electron beam) emitted from an electron gun 9 housed in the neck 2 Bc, both sides electron beam Bs × 2)
The image is reproduced by two-dimensionally scanning the phosphor screen applied inside the screen 1a by the horizontal and vertical deflection magnetic fields formed by the deflection yoke 10.

That is, the electron beam B (central electron beam Bc, both-sided electron beam Bs × 2) is a color signal of red (outer beam), green (center beam), and blue (outer beam) supplied from the stem pin 13 and has an intensity. The color is modulated and selected by the shadow mask 4 placed immediately before the phosphor screen 4 and collides with each phosphor to reproduce a predetermined color image.

FIG. 5 is a side view illustrating an example of the configuration of an in-line electron gun used in the color cathode ray tube shown in FIG. 4, wherein 16 is a cathode structure, 17 is a first electrode, and 18 is a second electrode.
The electrode, 19 is a third electrode, 20 is a fourth electrode, 21 is a fifth electrode, 22 is a sixth electrode, and 23 is multi-form glass. Although a shield cup is attached to the sixth electrode 22, it is not shown.

In FIG. 1, a cathode structure 16 and a first electrode 1 are shown.
A so-called tripolar portion for forming an electron beam with the seventh and second electrodes 18 is formed, and a fifth lens 21 and a sixth electrode 22 form a main lens.

Each electrode is provided with a planting portion for planting in the multi-form glass 23 around each of the electrodes, and the planting portion is buried and fixed while heating and softening the multi-form glass at the time of assembly.

In this electron gun, the first electrode 17 and the second electrode 1
Reference numeral 8 denotes a plate-like electrode. This plate-like electrode is formed by projecting a portion to be implanted on the multi-form glass 23 around a plate-like portion 17 'in which three electron beam passage holes are formed.
That is, the multi-form glass 23 is provided on the first electrode 17.
An implanted portion 17a is implanted on the second electrode 18, and an implanted portion 18a is integrally formed on the periphery of the plate-shaped portion.

The implants 17a and 18a are provided so as to project in parallel with or parallel to the plane of the plate-like portion in which the electron beam passage holes are formed.

In the case of an electrode composed of a plurality of electrode parts or cylindrical members, such as the third electrode 19 to the sixth electrode 22, the portion to be implanted in the multi-form glass is an implanted part separate from the electrode. Is welded to the outer periphery.

FIG. 6 is an explanatory view of a configuration example of a plate-like electrode used in the electron gun shown in FIG. 5, wherein 17 is a first electrode, 17a is an implanted portion, and three electron beam passage holes. Are formed integrally with the periphery of the plate-shaped portion 17 'in which the implanted portion 17a is formed. The implanted portion 17a is located at an intermediate portion of the electron beam passage hole formed in the plate-shaped portion 17' with respect to a straight line passing through the electron beam passage hole. Point A, which is symmetrical and rises from the plate-like portion, is taken from straight lines 17R and 17B perpendicular to a horizontal line (a straight line connecting the three electron beam passage holes) XX passing through the electron beam passage holes at both ends. Is also located near the straight line 17G passing through the central electron beam passage hole.

Such an implanted portion 17a is embedded and fixed in a multi-form glass together with other electrodes to constitute an electron gun. The second electrode 18 has the same structure.

[0014]

As described above, in the electron gun used in the conventional color cathode ray tube, the first
The electrode 17 and the second electrode 18 are fixed to the multi-form glass 23 on one plane orthogonal to the multi-form glass 23. Therefore, if there is a temperature change in the manufacturing process of the color cathode ray tube, the first electrode 17 is distorted by thermal expansion and thermal contraction at the portion where the multi-form glass 23 is implanted, displaced from a predetermined position, and displaced from the adjacent electrode. The distance may fluctuate or the above-mentioned distortion may remain to change the distance between adjacent electrodes when an external impact is applied after the completion of the color cathode ray tube.

Such a change in the distance between the first electrode 17 and the cathode structure 16 or the distance between the first electrode 17 and the second electrode 18 changes the cut-off characteristic or takes out from the cathode when an external impact is applied. A change in the amount of current of the electron beam generated causes a change in brightness and chromaticity of the screen, thereby deteriorating image quality.

In order to solve such a displacement of the plate-like electrode, there has been proposed one using a reinforcing member separate from the plate-like electrode as disclosed in Japanese Patent Application Laid-Open No. 5-61950. .

In the plate-shaped electrode disclosed in this publication, a reinforcing member is welded to the plate-shaped electrode, and the implanted portion formed on the plate-shaped electrode and the welded reinforcing member are buried at intervals in the tube axis direction. With this configuration, contact with an adjacent electrode due to deformation of the plate-like electrode is prevented.

However, providing such a reinforcing member separately increases the number of parts and increases the number of welding steps, and if the welding accuracy varies, it is difficult to maintain uniform overall characteristics of the electron gun. There is.

An object of the present invention is to solve the above-mentioned problems of the prior art and to improve the holding force of a plate-like electrode on a multi-form glass without using a component such as a reinforcing member, thereby improving the distance between adjacent electrodes. An object of the present invention is to provide a color cathode ray tube provided with an electron gun having uniform characteristics by reducing a change in interval.

[0020]

In order to achieve the above-mentioned object, the present invention is configured to embed and fix a plate-shaped electrode in a multi-form glass at different positions in a tube axis direction. The implanted portion is formed at a position where the displacement of the installation portion does not change the position of the electron beam passage holes on both sides of the plurality of electron beam passage holes formed in the plate electrode in the tube axis direction.

That is, a first invention according to claim 1 is a multi-form glass formed on a peripheral portion of a plate-like portion having a plurality of electron beam passage holes for passing a plurality of electron beams generated on one horizontal plane. A plurality of electrodes including at least one plate-like electrode having a projecting portion projecting therefrom are arranged at predetermined intervals along a tube axis, and the planting portion of the plate-like electrode is implanted together with the planting portions of other electrodes. In a color cathode ray tube having an electron gun implanted and fixed integrally on a multi-form glass, an electron beam passing portion in which plate-shaped electrodes constituting the electron gun are located on both sides of the electron beam passage hole is provided. A first planted portion that rises from the plate portion at a position symmetrical with respect to each of the holes; and a second plant that rises from the plate portion at a position that is symmetrical with respect to the electron beam passage hole located at the central portion.
Wherein the first planting portion and the second planting portion are planted on the multi-form glass at different positions in the tube axis direction.

According to the structure of the present invention, since the plate-like electrode is embedded and fixed in each multi-form glass at a pair of implanted portions separated in the tube axis direction, the plate-like portion of the plate-like electrode due to thermal deformation is fixed. The displacement in the axial direction is suppressed, the distance between adjacent electrodes is prevented from fluctuating, and the electrode position can be prevented from changing due to an external impact.

According to a second aspect of the present invention, there is provided the electron beam passage hole according to the first aspect, wherein an outer end of the first implanted portion rising from the plate-like portion is located at the both side portions. And is located outside a line perpendicular to the horizontal plane passing through.

Further, a third aspect of the present invention provides a third aspect of the present invention,
In the first invention, an outer end of the first planting portion rising from the plate portion is located on a line perpendicular to the horizontal plane passing through the electron beam passage holes located on the both side portions. .

According to the second and third aspects of the present invention,
The deformation of the implanted part suppresses the displacement of the part where the electron beam passage hole formed in the plate-shaped electrode part is displaced, it can avoid the variation of cut-off characteristics of multiple electron beams, and also prevents the electrode position from changing due to external impact it can.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to examples. Here, an example of the first electrode of the electron gun will be described with respect to a color cathode ray tube including an electron gun having a first electrode and a second electrode as plate electrodes, but the same applies to the second electrode. It is. Further, as long as it is a plate-like electrode, it can be similarly applied to other electrodes.

FIG. 1 is a side view of an electron gun for explaining an embodiment of a color cathode ray tube according to the present invention, wherein 16 is a cathode structure, 17 is a first electrode, 17 'is a plate-like portion, and 17a
Is a first implanted portion, 17b is a second implanted portion, 18 is a second electrode, 18a is a first implanted portion, 18b is a second implanted portion,
9 is a third electrode, 20 is a fourth electrode, 21 is a fifth electrode, 22
Is a sixth electrode, and 23 is a multi-form glass. Although a shield cup is attached to the sixth electrode 22, it is not shown in the figure as in FIG.

In the figure, the cathode structure 16 and the first electrode 1 are shown.
The seventh and second electrodes 18 constitute a triode for forming an electron beam, and the fifth electrode 21 and the sixth electrode 22 form a main lens.

Each electrode is provided with a planting portion around the periphery thereof for planting in the multiform glass 23, and the planting portion is buried and fixed in a state where the multiform glass is heated and softened at the time of assembly.

That is, the first electrode 17 has a first implanted portion 17a and a second implanted portion 17b which are implanted in the multi-form glass 23, and the second electrode 18 has a first implanted portion 18a.
a and the second planting portion 18b are respectively formed integrally with and protrude from the periphery of the plate portion.

Each of the first implanted portion 17a and the second implanted portion 17b, and the first implanted portion 18a and the second implanted portion 18b have an electron beam passage hole. Projections are provided in parallel with the plane of the plate-like portion 17 'and at an interval in the tube axis direction.

In the case of an electrode composed of a plurality of electrode parts or a cylindrical member, such as the third electrode 19 to the sixth electrode 22, the part to be implanted in the multi-form glass is formed separately from the electrode. Welded.

FIGS. 2A and 2B are explanatory diagrams of a first configuration example of the first electrode in FIG. 1, wherein FIG. 2A is a front view and FIG. 2B is a side view.

As shown in the figure, the first electrode 17 passes through a plate-like portion 17 'having three electron beam passage holes and the three electron beam passage holes of the plate-like portion 17'. It is composed of a first implanted portion 17a and a second implanted portion 17b formed so as to protrude at positions symmetrical with respect to the straight line XX.

Then, as shown in FIG.
Is formed on straight lines 17R and 17B passing through the electron beam passage holes on both sides at right angles to the straight line XX passing through the three electron beam passage holes, and the second implantation portion 17b is formed on the 3rd line. It is formed on a straight line 17G passing through the central electron beam passage hole at right angles to the straight line passing through the electron beam passage holes.

The point A where the first planting portion 17a rises from the plate-like portion 17 'is located outside the straight lines 17R and 17B passing through the electron beam passage holes on both sides. By setting the rising portion A at this position, when the plate-like portion 17 'is going to be deformed due to thermal expansion or thermal contraction, the deflection of the electron beam passage holes on both outer sides is suppressed. In addition, the position of the point A has an effect of causing equivalent stress to the three electron beam passage holes formed in the electrode.

As shown in FIG. 3B, the first implanted portion 17a and the second implanted portion 17b are protruded at a distance d along the pipe axis Z-Z. These planting members are buried and fixed at positions separated from the beading glass in the tube axis direction.

According to this configuration, the first electrode 17 has an improved holding force at the portion where the first electrode 17 is planted in the multi-form glass, and suppresses a fluctuation in the interval between the first electrode 17 and the adjacent electrode due to thermal expansion or contraction or an external impact. A change in the position of the three electron beam passage holes in the axial direction of the tube is also avoided.

FIG. 3 is a front view for explaining a second configuration example of the first electrode in FIG. 1, and shows three points A which are rising portions from the plate-like portion 17 'of the first implanted member 17a. Are placed on straight lines 17R and 17B passing through the electron beam passing holes on both sides at right angles to the straight line XX passing through the electron beam passing hole. Other configurations are the same as those of the first example shown in FIG.

In the first example, the point A, which is the rising portion of the first implanted portion 17a, is at right angles to the straight line XX passing through the three electron beam passage holes and the straight line 17 passing through the electron beam passage holes on both sides.
Although placed outside R and 17B, in the second example, they are placed on the straight lines 17R and 17B.

By arranging the point A on the straight lines 17R and 17B, when the plate-like portion 17 'is to be deformed due to thermal expansion or thermal contraction in the same manner as in the first example, the electron beams on both outer sides are deformed. The displacement of the passage hole portion is suppressed, and the first electrode 17
The holding force of the planted part on the multi-form glass 23 is improved, the fluctuation of the distance between adjacent electrodes due to thermal expansion or contraction or external impact is suppressed, and the three electron beam passage holes are connected to each other. Axial position changes are also avoided.

On the other hand, the point A is located inside the straight lines 17R and 17B as shown in FIG.
When it is placed on the G side, the portions where the electron beam passage holes are formed on both sides of the plate-shaped portion 17 ′ are curved around the implanted portion with the multi-form glass as a result of thermal expansion or thermal contraction, so that the electron beam of the adjacent electrode is bent. The axis of the passage hole is deviated, and the distance between adjacent electrodes fluctuates.

According to the first configuration example and the second configuration example of the first electrode according to the present invention, the axial deviation of the electron beam passage hole and the fluctuation of the interval between the adjacent electrodes are suppressed, and the cutting is performed. An off-characteristics does not fluctuate, and an electron gun having characteristics with no variation can be configured.

As described above, the structure of the first electrode can be similarly applied to the second electrode, and can be applied to other electrodes as long as they are plate-like electrodes.

The present invention is applicable not only to a color cathode ray tube having an electron gun of the type shown in the above embodiment, but also to any type of cathode ray tube having an electron gun having a plate-like electrode. Can be similarly applied.

[0046]

As described above, according to the present invention,
Improves the holding power of the implanted part of the plate electrode on the multi-form glass without increasing the number of parts, suppresses position fluctuation due to thermal expansion or position change due to external force, and avoids variation in cutoff characteristics Thus, a high-quality color image can be reproduced by preventing a heat change of the completed color cathode ray tube or a change in chromaticity due to the application of an external force.

[Brief description of the drawings]

FIG. 1 is a side view of an electron gun for explaining one embodiment of a color cathode ray tube according to the present invention.

FIG. 2 is an explanatory diagram of a first configuration example of a first electrode in FIG. 1;

FIG. 3 is a front view illustrating a second configuration example of the first electrode in FIG. 1;

FIG. 4 is a cross-sectional view illustrating a structural example of a three-electron beam type color cathode ray tube to which the present invention is applied.

5 is a side view illustrating a configuration example of an in-line electron gun used in the color cathode ray tube shown in FIG.

6 is an explanatory diagram of a configuration example of a plate-like electrode used in the electron gun shown in FIG.

[Explanation of symbols]

 Reference Signs List 16 cathode structure 17 first electrode 17 'plate-like portion 17a first implanted portion 17b second implanted portion 18 second electrode 18a first implanted portion 18b second implanted portion 19 third electrode 20th Four electrodes 21 Fifth electrode 22 Sixth electrode 23 Beading glass.

Claims (3)

[Claims] At least one of a plurality of projecting portions formed on a multi-form glass is provided at a periphery of a plate-like portion having a plurality of electron beam passage holes for passing a plurality of electron beams generated on a horizontal plane. A plurality of electrodes including a plate-like electrode were arranged at predetermined intervals along the tube axis, and the planted portion of the plate-like electrode was planted together with the planted portions of other electrodes on beading glass and fixed integrally. In a color cathode-ray tube having an electron gun, the plate-shaped portions constituting the electron gun are symmetrical with respect to each of the electron beam passage holes located on both sides of the electron beam passage hole. The first to rise from
The first planting portion and the second planting portion each comprising a planting portion and a second planting portion rising from the plate-like portion at a position symmetrical with respect to the electron beam passage hole located at the center. Are implanted in the multi-form glass at different positions in the tube axis direction. 2. The method according to claim 1, wherein an outer end of the first implant portion rising from the plate-like portion is located outside a line perpendicular to the horizontal plane passing through the electron beam passage holes located on the both side portions. The color cathode ray tube according to claim 1, wherein 3. An outer end of the first planting portion rising from the plate-like portion is located on a line perpendicular to the horizontal plane passing through electron beam passage holes located on both side portions. The color cathode ray tube according to claim 1.