JPH10261372A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube with optimum static convergence of its side beams while holding the focusing characteristic of its electron gun still optimum without a major variation in the focusing characteristic. SOLUTION: The main lens of a second electrode means in an in-line electron gun comprises a cuplike focusing electrode 95 and a cuplike anode electrode 96. The focusing electrode 95 involves a compensating electrode 95-2 having three electron beam passing holes, both outer side holes of which are offset from the center axes of their corresponding electron beams along one plane to compensate the electric field acting on the beams passing therethrough.

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 cathode ray tube of various sizes which facilitates adjustment of static convergence and maintains the best focusing characteristics of an electron gun while maintaining a common main specification. The present invention relates to a color cathode ray tube having an in-line type electron gun capable of coping with the above.

[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 having a plurality of (three in the same) phosphor films applied 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, 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.

FIG. 9 is a cross-sectional view illustrating an example of the structure of a color cathode ray tube.
Is a neck portion for accommodating the electron gun, 3 is a funnel portion connecting the panel portion and the neck portion, 4 is a fluorescent screen, 5 is a shadow mask, 6 is a mask frame, 7 is a magnetic shield, 8 is a mask suspension mechanism, 9 Is an in-line type electron gun, 10 is a deflection yoke, 11 is an internal conductive film, 12 is a shield cup, 1
3 is a contact spring, 14 is a getter, and 15 is a stem pin.

In this color cathode ray tube, a panel 1, a neck 2, and a funnel 3 constitute a vacuum envelope. An electron beam B emitted from an electron gun 9 housed in the neck 2 receives a deflection yoke 10 The screen 1a is two-dimensionally scanned by the horizontal and vertical deflection magnetic fields formed by.

The electron beam B is intensity-modulated by a modulation signal such as a video signal supplied from a stem pin 15, is selected in color by a shadow mask 4 installed immediately before the screen 1a, collides with each phosphor, and is irradiated with a predetermined light. Play a color image of.

FIG. 10 is a partially sectional side view for explaining an example of an in-line type electron gun accommodated in a color cathode ray tube, where K is a cathode, 91 is a first grid electrode, and 92 is a second grid electrode.
A grid electrode, 93 is a third grid electrode, 94 is a fourth grid electrode,
95 is a fifth grid electrode, 95-1 is an inner electrode installed inside the fifth grid electrode, 96 is a sixth grid electrode, 96-1
Is an inner electrode provided inside the sixth grid electrode, 97 is a shield cup, and 98 is beading glass.

In FIG. 1, a cathode K, a first grid electrode 91, a second grid electrode 92, and a third grid electrode 93 constitute first electrode means which is a so-called triode portion.
Fourth grid electrode 94, fifth grid electrode 95, sixth grid electrode 9
6 constitutes a second electrode means for focusing the electron beam from the first electrode on the screen.

In the second electrode means, the fifth grid electrode 95 forms a focusing electrode, and the fifth grid electrode 95 and the sixth grid electrode 96 form a main lens.

In a conventional in-line type electron gun used for a color cathode ray tube, three electron beams are easily focused on the phosphor screen 4 by a correction magnet (not shown) provided on the neck 2 shown in FIG. For this purpose, the side beam in the electron gun (the outer electron beam of the three in-line arranged electron beams, hereinafter simply referred to as the side beam; the central electron beam is simply referred to as the center beam) is positioned on the center beam side. To reduce the distance between the side beams on the phosphor screen inside the electron gun.

When the electrode (grating electrode) constituting the main lens is a non-rotationally symmetric cup-shaped electrode having a long axis in the in-line direction, the static convergence of the side beam can be adjusted by the electrode constituting the main lens (focusing electrode: Fifth grid electrode 95
And the anode electrode: the shape of the opening formed by the inner electrodes 95-1 and 96-1 installed in the cup electrode of the sixth grid electrode 96) and the installation position (distance from the end face of the cup electrode, etc.)
This is done by forming an appropriate electric field.

An example of this kind of prior art is disclosed in Japanese Patent Application Laid-Open No. 4-43532.

[0012]

In the above-mentioned prior art, changing the opening shape and the installation position of the inner electrode changes the entire electric field of the main lens and involves a significant change in focus characteristics. . That is, it is extremely difficult to simultaneously optimize both the focus characteristic and the static convergence.

As described above, in the case of an electron gun having a non-rotationally symmetric electrode constituting the main lens, when the static convergence of the side beam is to be optimized, a change in focus characteristic is large. It is difficult to cope with various sizes of cathode ray tubes while keeping them common.

Further, if the specifications are changed to accommodate various sizes of cathode ray tubes, it is difficult to obtain the best focus characteristics of the electron gun.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to appropriately adjust the static convergence of the side beam while maintaining the best focus characteristic of the electron gun without largely changing the focus characteristic of the electron gun. It is an object of the present invention to provide a color cathode ray tube.

[0016]

The construction of the present invention will be described with reference to the drawings of the embodiments and the reference numerals.

In an in-line type electron gun in which the electrodes constituting the main lens of the electron gun are non-rotationally symmetric, to adjust the static convergence of the side beam, one of the electrodes constituting the main lens (the fifth grid electrode) is used. 95) and the other electrode (sixth grid electrode 96) installed in the inner electrode 95-1.
It is necessary to change the shape of the opening of the inner electrode 96-1 installed in the inside and the installation position thereof. This will change the overall electric field of the main lens.

In the present invention, the change in the electric field of the entire main lens is minimized so that only the electric field at the end (side beam portion) on the cathode side of the electric field on the focusing electrode 95 side is changed. Correction electrode 95-2 having three rotationally symmetric electron beam passage holes (circular openings) in addition to the inner electrode provided inside the focusing electrode
And the electric field acting on the side beam is corrected by offsetting the center of the electron beam passage hole of the side beam from the center of the electron beam in an in-line direction.

Further, in the present invention, a plate-like partitioning electrode 95-3 provided so as to be orthogonal to the horizontal plane is provided near the electron beam passage hole of the side beam of the correction electrode.
Correct the electric field acting on the side beam.

With the above configuration, the offset amount of the electron beam passage hole of the side beam of the correction electrode 95-2 provided inside the focusing electrode, or the partition electrode 95-
By changing the height of the tube axis and the installation position of 3,
Various sizes of cathode ray tubes can be accommodated without changing the specifications of the focusing electrode 95 and the anode electrode 96 constituting the main lens.

Changing the offset amount of the correction electrode 95-2 adjusts the deflection amount of the side beam,
The electron beam passage hole of the side beam of the correction electrode 95-2 is offset to the outside in the in-line arrangement direction, or the partition electrode 95-3 installed near the electron beam passage hole of the side beam is placed on the electron beam passage hole side of the center beam. With this arrangement, the end of the electric field on the side of the focusing electrode 95 is pushed to the opposite side to the center beam, the side beam is deflected to the opposite side to the center beam, and the distance between the side beams on the phosphor screen increases.

Conversely, the electron beam passage hole of the side beam of the correction electrode 95-2 is offset inward in the in-line arrangement direction, or the partition electrode 95-3 installed near the electron beam passage hole of the side beam is connected to the side beam. By disposing it outside the electron beam passage hole, the end of the electric field on the focusing electrode 95 side is pushed to the center beam side, the side beam is deflected to the center beam side, and the distance between the side beams on the phosphor screen is reduced. Become smaller.

Therefore, for a small-sized cathode ray tube,
The electron beam passage hole for the side beam of the correction electrode may be offset inward in the in-line arrangement direction, or a partition electrode may be installed outside the side beam. The holes may be offset outward in the in-line arrangement direction, or a partition electrode may be provided on the center beam side of the side beam.

That is, in order to achieve the above object, the first invention according to claim 1 generates three electron beams and transmits these electron beams to initial paths parallel to each other on a horizontal plane. A cathode ray line equipped with an in-line type electron gun having first electrode means for directing the electron beam along the screen and second electrode means including an electrode constituting a main lens for focusing the electron beam on the screen. In the tube, the main lens of the second electrode means of the in-line type electron gun comprises a cup-shaped focusing electrode 95 and a cup-shaped anode electrode 96 as well, and three electron beams pass through the focusing electrode 95. Providing a correction electrode 95-2 having a hole and offsetting the center of the outer electron beam passage hole from the center axis of the electron beam along the horizontal plane;
It is characterized in that an electric field acting on a passing electron beam is corrected.

With this configuration, it is possible to provide a color cathode ray tube in which the static convergence of the side beam is optimized while maintaining the best focus characteristics of the electron gun without largely changing the focus characteristics of the electron gun. Become.

According to a second aspect of the present invention, there is provided a method for generating three electron beams and directing these electron beams on a screen along initial paths parallel to each other on a horizontal plane. A color cathode-ray tube including an in-line type electron gun having a first electrode means and a second electrode means including an electrode constituting a main lens for focusing the electron beam on a screen; The main lens of the second electrode means comprises a cup-shaped focusing electrode 95 and a cup-shaped anode electrode 96 as well, and has a correction electrode 95-2 having three electron beam passage holes inside the focusing electrode 95. And a plate-like partitioning electrode 95-3 provided so as to be orthogonal to the horizontal plane near the electron beam passage hole outside the correction electrode 95-2. And correcting the electric field acting on the electron beams passing through.

According to this configuration, it is also possible to provide a color cathode ray tube in which the static convergence of the side beam is optimized while maintaining the best focus characteristic of the electron gun without largely changing the focus characteristic of the electron gun. Becomes

As described above, various sizes of cathode ray tubes can be handled while keeping the main specifications of the electron gun common.

[0029]

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

FIG. 1 is a sectional view in the in-line direction for explaining a main part of an in-line type electron gun used in a first embodiment of a color cathode ray tube according to the present invention. FIG. It is a front view, 95 is a focusing electrode, 95-1
Are installed in the focusing electrode 95 and the beam passing holes a, b, c
, An inner electrode 95-2, a correction electrode 95-2,
Reference numerals a, 95b, and 95c denote electron beam passing holes formed in the correction electrode 95-2, 96 denotes an anode electrode, and 96-1 denotes a beam passing hole a ', b', and c 'formed in the anode electrode 96. Inner electrode, 97 is a shield cup, 97a,
97b and 97c are beam passing holes formed in the shield cup 97, Bc is a center beam, Bs is a side beam, S is a beam interval before entering the main lens, d1 is a center of the side beam Bs and an electron beam passing hole 95a. , 95
This is the offset amount from the center of c.

In FIGS. 1 and 2, a main lens is formed in a region opposed to the focusing electrode 95 and the anode electrode 96, and electron beams (center beam Bc and side beam Bs) are incident on the main lens at an interval S to perform a focusing operation. , The side beam Bs is deflected in the direction of the center beam Bc.

According to this embodiment, the electron beam passage hole 95 for the side beam Bs formed in the correction electrode 95-2.
a and 95c are offset by d1 outward from the center axis of the electron beam in the in-line direction.
Of the electric field on the cathode side is an electric field that receives a force that deflects the side beam BS in a direction opposite to the direction of the center beam Bc. For this reason, the amount by which the center beam Bc after passing through the main lens is deflected toward the center beam is reduced,
The distance between the side beams on the phosphor screen increases.

As described above, the distance between the side beams on the phosphor screen can be adjusted by changing the offset amount d1, so that the best characteristics of the electron gun can be obtained without largely changing the focus characteristics of the electron gun. It is possible to provide a color cathode ray tube in which the static convergence of the side beam is optimized while maintaining the focus characteristics, and it is possible to cope with various sizes of cathode ray tubes while keeping the main specifications of the electron gun common.

FIG. 3 is a sectional view in the in-line direction for explaining a main part of the in-line type electron gun used in the second embodiment of the color cathode ray tube according to the present invention. FIG. In the front view, the same reference numerals as those in FIGS. 1 and 2 correspond to the same parts.

Most of the structure of this embodiment is substantially the same as that of the above embodiment, except that the electron beam of the side beam Bs in the electron beam passage hole of the correction electrode 95-2 installed inside the focusing electrode 95. Position the center of the beam passage hole in the side beam B
The difference is that the center axis of s is offset by d2 toward the center beam Bc.

In this configuration, when the side beam Bs enters the main lens, the side beam Bs receives a force deflected toward the center beam Bc. For this reason,
The amount of the side beam Bs deflected toward the center beam Bc after passing through the main lens increases, and the distance between the side beams Bs on the phosphor screen decreases.

Since the distance between the side beams Bs on the phosphor screen can be adjusted by changing the offset amount d2, the best focus of the electron gun can be obtained without largely changing the focus characteristics of the electron gun. It is possible to provide a color cathode ray tube in which static convergence of the side beam Bs is optimized while maintaining characteristics.
It can support various sizes of cathode ray tubes while keeping the main specifications of the electron gun common.

FIG. 5 is a sectional view in the in-line direction for explaining a main part of the in-line type electron gun used in the third embodiment of the color cathode ray tube according to the present invention. FIG. In the front view, the same reference numerals as those in FIGS. 1 to 5 correspond to the same parts.

Most of the configuration of this embodiment is substantially the same as that of each of the above embodiments, except that the electron beam of the side beam is included in the electron beam passage hole of the correction electrode 95-2 installed inside the focusing electrode 95. The difference is that a partition plate 95-3 is provided near the center beam Bc near the beam passage hole. The three electron beam passage holes 95a, 95b, and 95c formed in the correction electrode 95-2 are all to be rotated as in the above-described embodiments, and their centers coincide with the center of the electron beam.

In this configuration, the side beam Bs is
When it enters the main lens, it receives a force deflected to the opposite side of the center beam. For this reason, the amount by which the side beam Bs after passing through the main lens is deflected toward the center beam Bc decreases, and the distance between the side beams on the phosphor screen can be adjusted.

The partition plate 95-3 is provided with a correction electrode 95-2.
And a plate body perpendicular to the in-line direction implanted in the tube axis direction (fluorescent screen direction). The distance d3 to the inner wall of the focusing electrode 95 and the height h1 in the tube axis direction are changed to change the side on the fluorescent screen. The distance between the beams can be adjusted.

Since the distance between the side beams on the phosphor screen can be adjusted by changing the distance d3 and / or the height h1, the electron gun can be adjusted without largely changing the focus characteristics of the electron gun. It is possible to provide a color cathode ray tube with optimized static convergence of the side beam while maintaining the best focus characteristics of Can respond.

FIG. 7 is a sectional view in an in-line direction for explaining a main part of an in-line type electron gun used in a fourth embodiment of a color cathode ray tube according to the present invention. FIG. 8 is a sectional view of a focusing electrode viewed from the direction AA in FIG. In the front view, the same reference numerals as those in FIGS. 5 and 6 correspond to the same parts.

Most of the configuration of this embodiment is substantially the same as that of the above embodiment, except that the side beam electron beam is formed in the electron beam passage hole of the correction electrode 95-2 installed inside the focusing electrode 95. The difference is that a partition plate 95-3 is provided outside the side beam Bc near the passage hole.

In this configuration, the side beam Bs is
When it enters the main lens, it receives a force deflected to the center beam side. For this reason, the amount by which the side beam Bs after passing through the main lens is deflected toward the center beam Bc increases, and the distance between the side beams on the phosphor screen can be adjusted.

The partition plate 95-3 is made of a plate perpendicular to the in-line direction, which is erected from the correction electrode 95-2 in the tube axis direction (the direction of the fluorescent screen), similarly to the embodiment described with reference to FIG. By changing the distance d4 from the inner wall of the focusing electrode 95 and the height h2 in the tube axis direction, the distance between the side beams on the phosphor screen can be adjusted.

Since the distance between the side beams on the phosphor screen can be adjusted by changing the distance d4 and / or the height h2, the electron gun can be adjusted without largely changing the focus characteristics of the electron gun. It is possible to provide a color cathode ray tube with optimized static convergence of the side beam while maintaining the best focus characteristics of Can respond.

In the above embodiment, the shape of the electron beam passage hole formed in the correction electrode 95 is circular.
The present invention is not limited to this, but may be any rotationally symmetric type.

[0049]

As described above, according to the present invention,
Regardless of the size of the cathode ray tube, the center axis of the electron beam passage hole of the side beam formed in the correction electrode is offset in any direction of the in-line direction while keeping the configuration of the main part common, and the offset is performed. By changing the amount, or by installing a partition plate on any side in the in-line direction near the electron beam passage hole of the side beam, by changing the position of this partition plate and the height in the tube axis direction, Since static convergence suitable for various cathode ray tube sizes can be obtained without substantially changing the focus characteristics, a color cathode ray tube capable of always displaying high-quality images can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view in the in-line direction illustrating a main part of an in-line type electron gun used in a first embodiment of a color cathode ray tube according to the present invention.

FIG. 2 is a front view of a focusing electrode viewed from a direction AA in FIG. 1;

FIG. 3 is an in-line direction sectional view for explaining a main part of an in-line type electron gun used in a second embodiment of the color cathode ray tube according to the present invention.

FIG. 4 is a front view of the focusing electrode viewed from a direction AA in FIG. 3;

FIG. 5 is an in-line direction sectional view for explaining a main part of an in-line type electron gun used in a third embodiment of the color cathode ray tube according to the present invention.

FIG. 6 is a front view of the focusing electrode seen from the direction AA in FIG. 5;

FIG. 7 is a sectional view in the in-line direction for explaining a main part of an in-line type electron gun used in a fourth embodiment of the color cathode ray tube according to the present invention.

FIG. 8 is a front view of the focusing electrode as viewed from a direction AA in FIG. 7;

FIG. 9 is a cross-sectional view illustrating a structural example of a color cathode ray tube.

FIG. 10 is a partially sectional side view illustrating an example of an in-line type electron gun accommodated in a color cathode ray tube.

[Explanation of symbols]

95 Focusing Electrode 95-1 Inner Electrode Formed in Focusing Electrode 95 to Form Beam Passing Holes a, b, c 95-2 Correction Electrodes 95a, 95b, 95c Electron Beam Passing Hole Formed in Correction Electrode 95-2 96 Anode electrode 96-1 Inner electrode provided in anode electrode 96 to form beam passage holes a ', b', c '97 Shield cups 97a, 97b, 97c Beam passage holes formed in shield cup 97 Bc center Beam Bs Side beam S Beam interval before entering the main lens d1, d2 Offset amount between the center of the side beam Bs and the center of the electron beam passage holes 95a and 95c.

Claims (2)

[Claims] A first electrode means for generating three electron beams and directing these electron beams on a screen along initial paths parallel to each other on a horizontal plane; A second electrode means including an electrode constituting a main lens for focusing on a color cathode ray tube having an in-line type electron gun, wherein the main lens of the second electrode means of the in-line type electron gun is a cup. And a correction electrode having three electron beam passage holes inside the focusing electrode and the center of the outer electron beam passage hole from the center axis of the electron beam. A color cathode ray tube, wherein the color cathode ray tube is offset along the horizontal plane to correct an electric field acting on a passing electron beam. 2. A first electrode means for generating three electron beams and directing these electron beams on a screen along initial paths parallel to each other on a horizontal plane; A second electrode means including an electrode constituting a main lens for focusing on a color cathode ray tube having an in-line type electron gun, wherein the main lens of the second electrode means of the in-line type electron gun is a cup. A correction electrode, which is composed of a cup-shaped focusing electrode and a cup-shaped anode electrode, and has three electron beam passing holes inside the focusing electrode, and the one horizontal plane near the electron beam passing hole outside the correction electrode. And a plate-like partitioning electrode provided so as to be orthogonal to the color cathode, wherein an electric field acting on an electron beam passing through the outer electron beam passage hole is corrected. Wire tube.