JPH10199444A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image quality of high resolution while shortening an axial directional length of an electron gun by constituting an anode of the electron gun with a small number of parts. SOLUTION: A color cathode-ray tube has a shield cup 17 where a bottom surface 171 forming openings 171a, 171b and 171c to respectively pass three electron beams is arranged on the fluorescent screen side of an anode 16, and a focusing electrode 15 has a single opening 152, of which a horizontal plane directional diameter is larger than a vertical plane directional diameter, in a part opposed to the anode 16 to form a main lens, and has a plate-like correcting electrode 151 having three electron beam passing holes 151a, 151b and 151c to respectively pass the three electron beams on the inside in close vicinity to this single opening 152, and the anode 16 has a single opening 162, of which a horizontal plane directional diameter is larger than a vertical plane directional diameter, in a part opposed to the focusing electrode 15 to form the main lens, and three openings 171a, 171b and 171c formed in the bottom surface 171 of the shield cup 17 is made closely adjacent to the single opening 162 of the anode 16.

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 color cathode ray tube provided with an in-line type electron gun which emits three electron beams toward a phosphor screen almost in parallel on a horizontal plane.

[0002]

2. Description of the Related Art A color cathode ray tube used as a monitor tube of a television picture tube or an information terminal has a built-in electron gun for emitting a plurality (generally three) of electron beams at one end of a vacuum envelope, and the other end. A phosphor screen having a plurality of color (the same three) phosphor films coated on its inner surface and a shadow mask which is a color selection electrode provided in close proximity to the phosphor screen is built in, and a plurality of light emitted from the electron gun are provided. A required image is displayed by two-dimensionally scanning the electron beam with a magnetic field generated by a deflection yoke provided outside the vacuum envelope.

The above-mentioned electron gun emits three electron beams along an initial path substantially parallel to a horizontal plane (a so-called three-pole portion), and an electron beam emitted from the first electrode means. A second electrode means including a main lens for peripherally accelerating the electron beam, accelerating and emitting the electron beam in the direction of the phosphor screen, and a shield cup for shielding a leakage magnetic field from the deflection yoke on the final electrode side. Is installed.

FIG. 10 is a sectional view of an essential part for explaining a configuration example of an in-line type electron gun used for a color cathode ray tube, FIG. 11 is a front view taken along the line AA of FIG. 10, and FIG.
FIG. 13 is a cross-sectional view taken along line CC of FIG. 10, FIG. 14 is a cross-sectional view taken along line DD of FIG. 10, and 10 is a cross-sectional view of FIG. Book cathode, 11
Is a first electrode which is an acceleration electrode, and 12 is a second electrode which is a control electrode.
An electrode, 13 is a third electrode, 14 is a fourth electrode, 15 is a fifth electrode as a focusing electrode, 16 is a sixth electrode as an anode, 17 is a shield cup, and 18 is beading glass.

In this electron gun, a first electrode 11, a second electrode 12, a third electrode 13, a fourth electrode 14,
Fifth electrode 15, sixth electrode 16, and shield cup 17
Are arranged in order, and plate-shaped correction electrodes 151 and 161 are provided inside the fifth electrode 15 and the sixth electrode 16, respectively.

The fifth electrode 15, which is a focusing electrode, is divided into two parts, a first divided electrode 15a and a second divided electrode 5b, and a main lens is formed at an opposing portion between the second divided electrode 15b and the sixth electrode 16. ing.

The second divided electrode 15b of the fifth electrode 15 and the sixth
The correction electrode 151 installed inside the electrode 16 has an electron beam passage hole 1 through which three electron beams respectively pass.
51a, 151b, 151c (151c is not shown) are formed, and the correction electrode 161 is provided with an elliptical opening 161b through which the center electron beam passes, and the inner wall of the sixth grid 16 to supply the side electron beam. Semi-elliptical cutouts 161a and 161c (161c is not shown) to be passed are formed.

The above-structured in-line type electron gun operates as follows.

That is, the thermoelectrons emitted from the three cathodes 10 heated by the heater are supplied to the second electrode 12 as a control electrode by a positive voltage of 400 to 1000 V applied to the first electrode 11 as an acceleration electrode. 3 sucked to the side
A book electron beam is formed. These electron beams pass through the opening in the second electrode 12 and then through the opening in the third electrode 13, and are prefocused by the fourth electrode 14 and the fifth electrode 15, so that the first split of the fifth electrode 5 is performed. The first split electrode 15 of the fifth electrode 15 is focused by the electrode 15a and the second split electrode 15b.
a and 20 to 35 kV applied to the sixth electrode (anode voltage:
(The highest voltage) and the positive voltage of 5 to 10 kV applied to the second divided electrode 15b.
It is supplied to a main lens formed at a portion of the electrode 15 where the second divided electrode 151 and the sixth electrode 16 are opposed to each other.

Thus, the focusing voltages of the electron beams of the present invention are made uniform without reducing the aperture of the main lens, an optimum focus is obtained over the entire screen screen, a good beam spot is obtained, and a high-resolution image quality is obtained. And a color cathode ray tube equipped with an in-line type electron gun.

Japanese Patent Application Laid-Open No. 58-103752 discloses a conventional technique of this type.

[0012]

In the above-mentioned prior art, the anode electrode system is composed of a component (elliptic cylinder component) in which the sixth electrode serving as the anode has at least a single elliptical aperture and three components for passing each electron beam. It was necessary to be composed of a plate-like electrode (correction electrode) having the above-mentioned opening and three electrode parts of a shield cup.

Therefore, the length of the anode electrode (sixth electrode) in the axial direction is increased, and the length of the entire electron gun is hindered from shortening the length of the cathode ray tube itself. There has been a problem that the magnetic field has an adverse effect on the focus characteristic and the shield cup generates heat.

An object of the present invention is to solve the above-mentioned problems of the prior art and to obtain a high-resolution image while shortening the axial length of the anode electrode system by configuring the anode electrode with a small number of parts. To provide a color cathode ray tube having an in-line type electron gun.

[0015]

In order to clarify the configuration of the present invention for achieving the above object, the following description will be made with reference to the embodiment.

That is, according to the first aspect of the present invention, a cathode (10), a control electrode (11), and an acceleration electrode (1) for emitting three electron beams substantially in parallel on a horizontal plane are provided.
A main lens is formed by a first electrode means consisting of 2), a focusing electrode (15) for focusing an electron beam emitted from the first electrode means, and an anode (16) to which the highest voltage is applied. A second electrode means for emitting an electron beam to the phosphor screen by means of a light source, and openings (171a, 171b, 171c) for passing three electron beams respectively on the bottom surface (171) and forming the bottom surface (171) on the anode. (16) A color cathode ray tube having an in-line type electron gun having at least a shield cup (17) provided on the phosphor screen side,
The focusing electrode (15) has a single opening (152) whose diameter in the horizontal plane direction is larger than that in the vertical plane direction at a portion facing the anode (16) forming the main lens,
A flat correction electrode (151) having three electron beam passage holes (151a, 151b, 151c) for allowing the three electron beams to pass therethrough inside the single opening (152); The anode 16 has a single opening (162) in a portion facing the focusing electrode 15 forming the main lens, the diameter in the horizontal plane direction being larger than the diameter in the vertical plane direction.
An in-line type electron gun having three openings (171a, 171b, 171c) formed in the bottom surface of the shield cup (17) and placed near a single opening (162) of the anode (16). It is characterized by having.

As in the configuration of the present invention, the function of a plate-shaped correction electrode provided inside the anode (16) is provided in the opening formed on the bottom surface of the shield cup (17), so that the axial direction of the anode (16) is improved. A color cathode ray tube having a shorter length and a shorter overall length can be obtained.

According to a second aspect of the present invention, there is provided a cathode (10) for emitting three electron beams substantially parallel to one horizontal plane, a control electrode (11), and an accelerating electrode (12). A main lens is formed at an opposing portion of the first electrode means, the focusing electrode (15) for focusing the electron beam emitted from the first electrode means, and the anode (19) to which the highest voltage is applied, and the electron beam is formed. In a color cathode ray tube having an in-line type electron gun having at least a second electrode means for emitting light to a phosphor screen, the focusing electrode (15) is provided at a portion facing the anode (16) forming the main lens. Three electrons having a single opening (152) whose diameter in the horizontal plane direction is larger than the diameter in the vertical plane direction and allowing the three electron beams to pass through the inside near the single opening (152), respectively. Beam passage hole (1 1a, 151b, has a plate-shaped first correction electrode having 151c) (151), said anode (19), said focusing electrode (1 forming the main lens
(5) an anode part (191) having a single opening (193) whose diameter in the horizontal plane direction is larger than the diameter in the vertical plane direction
A shield cup part (192) integrally formed with the anode part (191) and extending toward the fluorescent screen side;
The bottom of the shield cup portion (192) is formed close to the single opening (194) of (1), and the openings (171a, 171b, 171) through which three electron beams pass respectively.
c) and an in-line type electron gun composed of a flat second correction electrode (193).

According to the construction of the present invention, the anode part (191)
And the shield cup part (192) can be integrally formed, and the number of electrode parts can be reduced by attaching the flat second correction electrode (193) to the boundary between the anode part (191) and the shield cup part (192). In addition, the assembly operation is simplified, the axial length of the anode 16 is reduced, and a color cathode ray tube having a short overall length is obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to examples.

FIG. 1 is a partial sectional view illustrating an embodiment of an electron gun used for a color cathode ray tube according to the present invention.

FIG. 2 is a bottom view of the shield cup as viewed from the line AA in FIG. 1, and FIG. 3 is a front view of the anode along the line BB in FIG.

1 to 3, the same reference numerals as those in FIG. 9 correspond to the same parts.

In this embodiment, the sixth electrode 16 serving as the anode is formed into a cylindrical member having a single opening 162 having a single opening 162 opposed to the single opening of the second split electrode 15b of the fifth electrode 15 serving as the focusing electrode. And a shield cup 17
Is fixed by welding. On the bottom surface 171 of the shield cup 17, three openings 171a, 171b, 171c for passing three electron beams respectively are formed, and these three openings 171a, 171b, 1 are formed.
The bottom surface 171 having the function of a plate-shaped correction electrode in the prior art is provided on the bottom surface 171 having the base 71c.

As shown in FIG. 2, the shape of the opening formed in the bottom surface 171 of the shield cup 17 is such that the opening 171b through which the center electron beam passes is formed as a vertically long elliptical shape.
Openings 171a, 171 through which side electron beams pass
c is a vertically long elliptical shape having a slightly larger horizontal diameter than the opening 171b.

As shown in FIG. 3, the correction electrode 171 viewed from the focusing electrode 15 side is the same as in FIG. 10, and has the same function as the three electron beam correction electrodes.

The bottom surface 17 of the shield cup 17
The shape of the opening formed in 1 is not limited to that shown in FIG.

FIGS. 4, 5 and 6 are bottom views of the shield cup for explaining another example of the shape of the opening formed on the bottom face of the shield cup of the electron gun using the color cathode ray tube according to the present invention. The same reference numerals as 2 correspond to the same parts.

FIG. 4 shows a circular opening 171a, 171b, 171c formed in the bottom surface of the shield cup 17, FIG.
Is a vertically long rectangular shape.

These apertures may be selected and adopted depending on the color cathode ray tube to be applied and the characteristics of the electron gun.

FIG. 7 is a cross-sectional view illustrating the structure of the anode for explaining another embodiment of the electron gun used in the color cathode ray tube according to the present invention, and FIG. 8 is a front view viewed from the direction of the line BB in FIG. Reference numeral 19 denotes an anode, 191 denotes an anode portion, 192 denotes a shield cup portion, 193 denotes a correction electrode, and 194 denotes a single hole.

In this embodiment, the focusing electrode 15 has a single aperture 15 whose diameter in the horizontal plane is larger than that in the vertical direction at the portion facing the anode 19 forming the main lens, as in the previous embodiment.
And a flat correction electrode 151 having three electron beam passage holes 151a, 151b, and 151c for allowing the three electron beams to pass therethrough in the vicinity of the single opening 152. .

The anode 19 has a single opening 194 whose diameter in the horizontal plane is larger than that in the vertical direction, facing the single opening of the second split electrode 15b of the focusing electrode 15 forming the main lens. An anode part 191 and a shield cup part 19 formed integrally with the anode part 191 and extending toward the phosphor screen side;
2 and a flat correction electrode 193 having openings 19a, 19b, and 19c that form the bottom of the shield cup portion 192 near the single opening 194 of the anode portion 191 and allow three electron beams to pass therethrough. It is configured.

According to the present embodiment, the anode portion 191 and the shield cup portion 192 can be integrally formed, and the plate-shaped second correction electrode 193 is attached to the boundary between the anode portion 191 and the shield cup portion 192 so as to form an electrode. The number of parts is reduced, the assembly operation is simplified, the axial length of the anode 16 is shortened, and a color cathode ray tube having a short overall length is obtained.

In the above embodiment, the cathode 10, the first electrode 11, the second electrode 12, the third electrode 13, the fourth electrode 14,
Fifth electrode 15 (first divided electrode 15a, second divided electrode 15
b) An example of a so-called bi-potential type electron gun composed of the sixth electrode 16 and the shield cup 17 and forming a main lens at each opposing portion of the first divided electrode 15a, the second divided electrode 15b and the fifth electrode 16 However, the present invention is not limited to this, and includes, for example, a cathode, a first electrode, a second electrode, a third electrode, a fourth electrode, and a shield cup, and includes a portion facing the third electrode and the fourth electrode. The present invention can be similarly applied to various types of electron guns such as a so-called unipotential electron gun constituting the main lens.

FIG. 9 is a cross-sectional view for explaining an example of the overall structure of a color cathode ray tube according to the present invention. Reference numeral 21 denotes a panel portion, 22 denotes a funnel portion, 23 denotes a neck portion, 24 denotes a phosphor film, and 25 denotes a shadow. Mask, 26 is a mask frame,
27 is a magnetic shield, 28 is a shadow mask suspension mechanism,
29 is an inline electron gun, 30 is a deflection yoke, 31 is a beam correction device, 32 is an internal conductive film, 33 is a tension band, 34 is a stem pin, and 35 is a getter.

In this color cathode ray tube, a vacuum envelope is formed by the panel portion 21 and the neck portion 23, and the funnel portion 23 connecting the panel portion 21 and the neck portion 23.

On the inner surface of the panel portion 21, a so-called display screen having a phosphor film 24 coated with phosphors of three colors is formed.
An electron gun 29 for emitting three electron beams in-line is housed inside the neck portion 23, and the panel portion 21
A shadow mask 25 having a large number of apertures or blinds is provided near the phosphor film 24.

Bc and Bs indicate electron beams, and a deflection yoke 30 is provided in a transition region between the funnel 22 and the neck 23.

The getter 35 is supported by the tip of a getter support spring, one end of which is fixed to the shield cup of the electron gun 29. The getter 35 evaporates and scatters the getter material in the inner space of the vacuum envelope, thereby forming the vacuum envelope. It is used to increase the degree of vacuum in the vessel, and is welded to the shield cup during the assembly process of the electron gun.

The three electron beams emitted from the electron gun 29 are deflected in two directions, horizontal and vertical, by a vertical and horizontal deflecting magnetic field generated by a deflection yoke 30, and are selected by an electron beam passage hole of the shadow mask 25. Then, a color image is formed on the phosphor film 24 by colliding with each phosphor.

The electron gun used in this color cathode ray tube has the anode and shield cup structure described in the above embodiment, and has a reduced length in the tube axis direction and an anode portion having a shield cup or a shield cup function. Is positioned close to the main lens direction, the influence of the leakage magnetic field of the deflection yoke on the focus of the electron beam is reduced, and the heat generation of the shield cup is reduced.

As a result, the image quality formed on the phosphor film is greatly improved, and a high-quality color image can be obtained.

[0044]

As described above, according to the present invention,
By constructing the anode electrode with a small number of parts, the axial length of the anode electrode system is shortened, the focus performance is prevented from deteriorating due to the leakage magnetic field of the deflection yoke, and the heat generation of the shield cup is reduced. Image quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view illustrating an embodiment of an electron gun used in a color cathode ray tube according to the present invention.

FIG. 2 is a bottom view of the shield cup seen from line AA in FIG. 1;

FIG. 3 is a front view of the anode along the line BB in FIG. 1;

FIG. 4 is a bottom view of a shield cup illustrating another example of the shape of an opening formed in the bottom surface of the shield cup of the electron gun used in the color cathode ray tube according to the present invention.

FIG. 5 is a bottom view of the shield cup for explaining still another example of the shape of the opening formed on the bottom face of the shield cup of the electron gun used in the color cathode ray tube according to the present invention.

FIG. 6 is a bottom view of the shield cup for explaining still another example of the shape of the opening formed on the bottom face of the shield cup of the electron gun used in the color cathode ray tube according to the present invention.

FIG. 7 is a cross-sectional view illustrating a configuration of an anode for explaining another embodiment of the electron gun used in the color cathode ray tube according to the present invention.

FIG. 8 is a front view as seen from the direction of the line BB in FIG. 7;

FIG. 9 is a cross-sectional view illustrating an example of the overall structure of a color cathode ray tube according to the present invention.

FIG. 10 is a sectional view of an essential part for explaining a configuration example of an in-line type electron gun used for a color cathode ray tube.

FIG. 11 is a front view as seen from line AA of FIG. 10;

FIG. 12 is a sectional view taken along line BB of FIG. 10;

FIG. 13 is a front view as seen from line CC of FIG. 10;

FIG. 14 is a sectional view taken along the line DD in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Three cathodes incorporating a heater 11 First electrode which is an accelerating electrode 12 Second electrode which is a control electrode 13 Third electrode 14 Fourth electrode 15 Fifth electrode 151 which is a focusing electrode 151,161 Plate-shaped correction electrode 16 Sixth electrode 17 as an anode 17 Shield cup 171 Bottom surface of shield cup 171a, 171b, 171c Opening 18 Beading glass 19 Anode 191 Anode 192 Shield cup 193 Correction electrode 194 Single opening.

Claims (2)

[Claims] A first electrode comprising a cathode for emitting three electron beams substantially parallel to one horizontal plane, a control electrode and an accelerating electrode;
And a second lens for emitting the electron beam to the phosphor screen by forming a main lens at an opposing portion between the electrode means, the focusing electrode for focusing the electron beam emitted from the first electrode means, and the anode to which the highest voltage is applied. In a color cathode ray tube having an in-line type electron gun having at least electrode means and a shield cup in which a bottom surface is formed with an opening through which the three electron beams respectively pass and the bottom surface is provided on the phosphor screen side of the anode, The focusing electrode has a single opening whose diameter in the horizontal plane direction is larger than the diameter in the vertical plane direction at a portion facing the anode forming the main lens, and the inside of the focusing electrode is close to the single opening. A plate-shaped correction electrode having three electron beam passage holes through which each of the electron beams passes, wherein the anode is disposed in a horizontal plane direction at a portion facing the focusing electrode forming the main lens. Having an in-line type electron gun having a single opening that is larger than the diameter in the vertical plane direction, and three openings formed in the bottom surface of the shield cup being placed close to the single opening of the anode. A color cathode ray tube characterized by the above. 2. A first electrode comprising a cathode for emitting three electron beams substantially parallel to one horizontal plane, a control electrode and an accelerating electrode.
And a second lens for emitting the electron beam to the phosphor screen by forming a main lens at an opposing portion between the electrode means, the focusing electrode for focusing the electron beam emitted from the first electrode means, and the anode to which the highest voltage is applied. A color cathode ray tube including an in-line type electron gun having at least an electrode means, wherein the focusing electrode has a diameter in a horizontal plane direction larger than a diameter in a vertical plane direction at a portion facing the anode forming the main lens. A flat plate-shaped first correction electrode having a single opening and having three electron beam passage holes for allowing the three electron beams to pass therethrough in the vicinity of the single opening; An anode section having a single opening whose diameter in the horizontal plane direction is larger than the diameter in the vertical plane direction at the portion facing the focusing electrode forming the main lens, and integrally formed with the anode section and extending to the phosphor screen side. To shield An in-line configuration comprising: a bottom portion of the shield cup portion adjacent to a single opening of the anode portion; and a flat plate-shaped second correction electrode having openings through which three electron beams pass. A color cathode ray tube comprising a type electron gun.