JPH07142003A - Cathode-ray tube and its manufacture - Google Patents

Abstract

PURPOSE:To provide a CRT with high resolution and less moire generation by using a common specification for constitution from a cathode to a main lens formed by a large diameter focusing electrode and a large diameter cathode electrode and preparing cylindrical electrode parts with different offset quantities in electron beam passing aperture mounted in a bottom portion. CONSTITUTION:Electron beams Bs and Bc are incident in a main lens at a space S and then they are incident in electron beam passing apertures 97a, 97b and 97c at the bottom part of a cup electrode 97 by receiving designated focusing. The effective diameter of the main lens is expanded by making the diameters of a focusing electrode 95 and a cathode electrode 96 as large as possible. At this time, deflected quantity of a side electron beam Bs is weak and a point at which three electron beams Bs, Bc are concentrated is elongated in a line since the side electron beam passing apertures 97a, and 97c and offset by d1 in a center electron beam direction. By this constitution, focusing characteristic is improved across the whole electric current area of the electron beam and agreeable resolution can be obtained and moire is reduced in a small electric current area. An electron gun main part is made by common specification regardless of the CRT size so that the specification can match various CRT sizes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube, and in particular, it is possible to obtain good resolution by improving the focus characteristics over the entire phosphor screen and in the entire current region of the electron beam. The present invention relates to a cathode ray tube provided with an electron gun which has a common specification and is compatible with various cathode ray tube sizes, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A color cathode ray tube having a plurality of in-line arranged electron beams is widely used as an image display means of a television receiver or a monitor terminal.

FIG. 7 is a sectional view for explaining the structure of a shadow mask type color cathode ray tube as an example of the color cathode ray tube, wherein 1 is a panel portion which constitutes an image screen, 2 is a neck portion which houses an electron gun, 3 is a funnel portion connecting the panel portion and the neck portion, 4 is a fluorescent surface formed on the inner surface of the panel portion, 5 is a shadow mask, 6 is a mask frame for holding the shadow mask, and 7 is a magnetic shield for shielding an external magnetic field. , 8 is a suspension spring, 9 is an in-line type electron gun, 10 is a deflecting device, 11 is a dental ring / purity magnet, B _C is a center electron beam, and B _S is a side electron beam.

In FIG. 1, a color cathode ray tube of this type has a panel portion 1 having a phosphor screen 4 formed on the inner surface thereof and an electron gun 9.
A vacuum envelope is formed from a neck portion 2 for accommodating the above and a funnel portion 3 connecting the panel portion and the neck portion.

The electron gun housed in the neck portion has a plurality of electrodes such as a cathode, a control electrode, a focusing electrode, and an anode electrode facing the focusing electrode. The focusing lens and the anode electrode form a main lens. A plurality of electron beams that are configured and arranged in-line are emitted toward the phosphor screen 4.

The deflection device provided in the transition region between the funnel portion and the neck portion of the vacuum envelope deflects the three electron beams emitted from the electron gun 9 in both the horizontal and vertical directions of the fluorescent screen 4 to generate shadows. A color image is formed by receiving color selection by the mask 5 and striking the phosphor screen 4.

The shadow mask 5 is welded and fixed to the mask frame 6, and a suspension spring 8 fixed to a part of the outer periphery of the mask frame 6 is locked to a panel pin embedded in the inner wall of the panel 1 to cause fluorescence. It is mounted at a predetermined distance from the surface 4.

FIG. 8 is a side view illustrating an example of an electron gun housed in the neck portion of a color cathode ray tube, in which K is a cathode, 91 is a first electrode, 92 is a second electrode, and 93 is a third electrode. , 94 is a fourth electrode, 95 is a fifth electrode, 96 is a sixth electrode, 97 is a cylindrical electrode, 98 is bead glass, and 99 is a stem.

In the figure, the first electrode 91 to the fourth electrode 9
The control and prefocusing are performed by means of 4, and the main lens is constituted by the fifth electrode 95 which is the focusing electrode and the sixth electrode 96 which is the anode electrode.

The cylindrical electrode 97 is a so-called cup electrode, which is connected to the anode electrode 6 (sixth electrode) to shield the deflection magnetic field and to position the electron gun on the inner wall of the neck portion. An electrode component for fixing the getter is constructed.

In addition to the above-mentioned type, in addition to the above electron gun, it has a cathode, a first electrode, a second electrode, a third electrode, a fourth electrode and a cylindrical electrode, and the second electrode and the third electrode. In addition, there are various types in which the main lens is configured.

FIG. 9 is a side sectional view of an essential part for explaining the electrode structure around the main lens in the conventional electron gun.

In FIG. 9, an anode electrode 96 is connected to the cylindrical electrode 97, and three electron beam passage openings 97a, 97b, 97c are formed in the bottom portion on the anode side. Further, three electron beam passage openings 96a, 96b, 96c are provided on the focusing electrode 95 side of the anode electrode 96, and three electron beam passage openings 95a, 96a, 96b, 96c are provided on the anode electrode side of the focusing electrode 95.
95b and 95c are provided, and a main lens is formed at a portion where the focusing electrode 95 and the anode electrode 96 face each other.

In this type of electron gun, the three electron beams B _S , B _C , and B _S are concentrated at the center of the phosphor screen when there is no deflection.
In order to achieve a so-called static convergence, the central axes of the side electron beam passage openings 96a and 96c of the electron beam passage openings formed in the anode electrode 96 are arranged in the side direction (inline arrangement) with respect to the electron beam interval S incident on the main lens. Direction) is offset by d so as to be symmetrical with the center electron beam axis.

With this configuration, the two side electron beams B _S are bent in the direction of the center electron beam B _C , and the three electron beams are concentrated on the phosphor screen.

In this type of electron gun, as a means for obtaining a good reproduced image from the central portion to the peripheral portion of the phosphor screen, for example, electrodes (second electrode and third electrode) forming a focusing lens are used. A lens provided with an astigmatic lens in the area (Japanese Patent Laid-Open No. 53-18866), in-line 3
The electron beam passage openings of the electrodes (first electrode and second electrode) forming the prefocus lens of the beam electron gun are made vertically long, the shapes of the electrodes are made different, and the aspect ratio of the center electron gun is set to that of the side electron gun. With a smaller size (Japanese Patent Laid-Open No. 51-64368), a non-rotationally symmetric lens is formed by a slit formed on the cathode side of the third electrode of an in-line array electron gun, and the depth of the slit in the axial direction of the electron gun is set. A method in which an electron beam impinges on a fluorescent screen through at least one non-rotationally symmetric lens in which the center electron beam is deeper than the side electron beam (JP-A-60-81736).
No. publication) is known.

The above-mentioned conventional electrodes (first electrode, second electrode, ...) Refer to the electrodes described in the respective publications.

[0018]

The focus characteristic of the cathode ray tube is required to have good resolution in the entire current region of the electron beam over the entire screen composed of the phosphor screen and to cause moire in the low current region. Moreover, there is uniformity in the resolution of the entire screen in the entire current range.

Designing an electron gun that simultaneously satisfies such a plurality of characteristics requires a high level of technology.

According to the research conducted by the present inventors, it is indispensable to provide an electron gun having a combination of a lens with astigmatism and a large-diameter main lens in order to provide the cathode ray tube with the above-mentioned various characteristics. It turned out that

However, there is a limit in the cross-sectional size of the neck portion from the viewpoint of power consumption for generating a deflection magnetic field in the inner diameter of the vacuum envelope accommodating the electron gun, and the outer diameter of the large-diameter main lens is the above-mentioned limit. Be restricted.

In the above-mentioned prior art, the limit structure of substantial enlargement of the aperture of the main lens is not considered under the above restrictions.

Further, in the above-mentioned prior art, no consideration has been given to a structure that simplifies the production of the electrode parts constituting the large-diameter main lens.

No consideration is given to the relationship between the so-called cup electrode electron beam passage opening and static convergence.

In the electron gun shown in FIG. 8, the influences of the electric field on the electron beam due to the length of each electrode, the diameter of the electron beam passage opening, etc. are all different. For example, the shape of the electron beam passage opening of the first electrode 91 close to the cathode K influences the spot shape of the electron beam in the small current area, but the shape of the electron beam passage opening of the second electrode 92 is large in the small current area. It affects the spot shape of the electron beam to the basin.

Further, in the case of supplying the anode voltage to the sixth electrode 96 to form the main lens between the fifth electrode 95 and the sixth electrode 96, the fifth electrode 95 and the sixth electrode constituting the main lens The shape of the electron beam passage port 96 has a great influence on the shape of the electron beam spot in the large current region, but the influence on the shape of the electron beam spot in the small current region is smaller than that in the large current region.

The length in the tube axis direction of the fourth electrode 94 of the electron gun affects the magnitude of the optimum focus voltage,
Moreover, the difference between the optimum focus voltages at the time of the small current and the large current is remarkably influenced, but the influence of the length change of the fifth voltage 95 in the tube axis direction is remarkably smaller than that of the fourth electrode 94.

Therefore, in order to optimize each characteristic value of the electron beam, it is necessary to optimize the structure of the electrode that most effectively acts on each characteristic.

However, the diameter of the bright spot drawn by the electron beam spot on the phosphor screen depends on the spherical aberration of the main lens. This spherical aberration can be reduced by increasing the diameter of the main lens.

Further, when the hole pitch of the shadow mask in the direction perpendicular to the electron beam scanning direction of the cathode ray tube is made small or the density of the electron beam scanning lines is made large, the electron beam and the shadow are in particular in a small current region of the electron beam. Since optical interference occurs with the mask, it is necessary to optimize the moire contrast.

Further, a circular electron beam passage opening for passing each electron beam is formed at the bottom of the cylindrical electrode 97, and this electron beam passage opening is for the electron beam after passing through the main lens. In the prior art, which is not independent but affects the passage of the electron beam and the aperture position thereof is simply the S dimension, the static convergence effect in the main lens is reduced.

However, the above-mentioned conventional techniques cannot overcome the above-mentioned various problems.

At present, there are cathode ray tubes of various sizes, and electron guns having specifications corresponding to the sizes of the respective cathode ray tubes are prepared.

In particular, since the above-mentioned static convergence varies greatly depending on the size of the cathode ray tube, for example, in the electron gun having the structure shown in FIG. 9, the electron beam passage opening of the anode electrode is made different in size. There was a limit to the cost reduction because it was prepared for the production of different cathode ray tubes.

The object of the present invention is to solve the above-mentioned problems of the prior art, improve the focus characteristics in the entire current region of the electron beam, and obtain a good resolution.
Reduces moiré in the small current range, makes the main part of the electron gun have a common specification regardless of the cathode ray tube size, and various cathode ray tubes depending on the offset amount of the electron beam passage port formed in the tubular electrode part connected to the anode. An object of the present invention is to provide a cathode ray tube equipped with an electron gun configured to correspond to a size.

[0036]

In order to achieve the above object, an outside of a vacuum comprising a panel section having a phosphor screen, a neck section for accommodating an electron gun, and a funnel section connecting the panel section and the neck section. A cathode ray tube including at least an envelope, an electron gun for emitting a plurality of electron beams contained in the neck portion in an in-line arrangement, and a deflection device provided in a transition region of the funnel portion and the neck portion of the vacuum envelope. In the tube, the electron gun has a main lens composed of a focusing electrode and an anode electrode opposed to the electron gun, and has a plurality of electron beam passage openings at the bottom for passing the electron beams, respectively, and is coaxial with the electron gun axis. A cylindrical electrode part for connecting a member for positioning the electron gun in the vacuum envelope, the cylindrical electrode part being installed between the anode electrode and the fluorescent screen The center of the side electron beam passage openings of the plurality of electron beam passage openings provided on the anode side bottom of the tubular electrode component is offset in the in-line arrangement direction with respect to the electron beam interval incident on the main lens. Characterize.

Further, according to the present invention, a vacuum envelope comprising a panel portion having a phosphor screen, a neck portion for accommodating an electron gun and a funnel portion connecting the panel portion and the neck portion, and a vacuum envelope in the neck portion are provided. In a cathode ray tube including at least an electron gun for emitting a plurality of contained electron beams in an in-line arrangement, and a deflection device provided in a transition region of a funnel portion and a neck portion of the vacuum envelope, the electron gun is focused. A main lens is constituted by an anode electrode facing the electrode, and with an internal electrode for focusing control so as to have a plurality of electron beam passage openings inside at least one of the focusing electrode and the anode electrode, The bottom surface has a plurality of electron beam passage openings for passing the plurality of electron beams, and the phosphor screen is connected to the anode electrode coaxially with the electron gun axis. A plurality of electron beams provided on the anode side bottom portion of the tubular electrode component, which is provided with a tubular electrode component for mounting a member for positioning the electron gun in the vacuum envelope. The center of the side electron beam passage opening of the passage opening is offset in the in-line arrangement direction with respect to the interval of the electron beams incident on the main lens.

Further, according to the present invention, the internal electrode provided in the anode electrode is replaced with an electron beam passage opening formed in the bottom of the cylindrical electrode, and a side electron beam passage opening of the electron beam passage formed in the cylindrical electrode is replaced. Is centered in the in-line arrangement direction with respect to the electron beam interval incident on the main lens.

The focusing electrode and the anode electrode are basically made as large as possible in the direction perpendicular to the in-line arrangement direction.

At this time, particularly in the case of having an internal electrode, the degree of concentration of the side electron beam is increased by constructing the internal electrode inside the electrode.

Further, according to the present invention, a vacuum envelope comprising a panel portion having a phosphor screen, a neck portion for accommodating an electron gun, and a funnel portion connecting the panel portion and the neck portion, and a vacuum envelope in the neck portion are provided. An electron gun for emitting a plurality of contained electron beams in an in-line arrangement, and a method for manufacturing a cathode ray tube including at least a funnel portion of the vacuum envelope and a deflecting device which is provided in a transition region of a neck portion, in a bottom portion, A plurality of electron beam passage openings for passing the plurality of electron beams, respectively, are provided coaxially with the electron gun axis, connected to the anode electrode, and installed between the phosphor screen and the electron beam inside the vacuum envelope. The constituent electrodes of the electron gun except for the tubular electrode component for attaching the member for positioning the gun are prepared as common specifications for the cathode ray tube size, and the tubular electrode component is prepared. By connecting the plurality of electron beam passage port formed in the bottom made different offset amount of the inline direction the tubular electrode component on the anode, characterized in that to correspond to the desired cathode ray tube sizes.

[0042]

With the above-described structure of the present invention, the specifications from the cathode to the main lens composed of the large-diameter focusing electrode and the large-diameter anode electrode are common, and the offset of the electron beam passage opening formed at the bottom is provided. By preparing a plurality of tubular electrode parts with different amounts, it is possible to deal with cathode ray tubes of various sizes with high resolution and reduced generation of moire.

The electron beam passage opening formed at the bottom of this cylindrical electrode component is such that when the side electron beam passage hole is offset inward in the in-line arranging direction from the electron beam interval incident on the main lens, the side electron beam passes through the center electron. When the light beam is strongly deflected in the beam direction and, conversely, it is offset outward in the in-line arrangement direction, this deflection amount becomes small.

Therefore, it is formed at the bottom of the cylindrical electrode so that it is offset inward in the in-line arrangement direction when it is applied to a small-sized cathode ray tube, and is offset outward in the in-line arrangement direction when it is applied to a large-sized cathode ray tube. The position of the electron beam passage opening is changed.

As described above, the main specifications of the electron gun are common, and only the cylindrical electrodes having different opening positions of the electron beam passage holes are prepared for the required cathode ray tube size. Can be easily manufactured.

As a result, the cost for manufacturing the cathode ray tube can be significantly reduced.

[0047]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a side sectional view of a main part of a built-in electron gun for explaining a first embodiment of a cathode ray tube according to the present invention.
Reference numeral 95 is a focusing electrode, 95a, 95b and 95c are electron beam passage openings formed on the anode side of the focusing electrode, 96 is an anode electrode,
96a, 96b and 96c are electron beam passage openings formed on the focusing electrode side of the anode electrode, 97 is a cup electrode which is a cylindrical electrode, 97a, 97b and 97c are electron beam passage openings formed at the bottom of the cup electrode, and B _C Is the center electron beam, B
_S is a side electron beam, S is a focusing electrode 95 and an anode electrode 9.
Distance of the electron beam entering the main lens formed opposite part of 6, the side electron beam passage hole 97a of the d ₁ is an electron beam passage port formed in the bottom of the cup electrode, 97c
Is the offset amount.

In the figure, the electron beams B _S and B _C are incident on the main lens at a distance S, receive the required focusing and are formed by electron beam passage openings 97a and 97 formed at the bottom of the cup electrode 97.
It enters b and 97c. The focusing electrode 95 and the anode electrode 96 are made as large as possible to enlarge the effective diameter of the main lens.

At this time, the side electron beam passage port 97
Since a and 97c are offset by d _{1 in the} direction of the center electron beam, the deflection amount of the side electron beam B _S is weak, and the point where the three electron beams B _S and B _C are concentrated becomes long.

It can be said that the electron gun having the structure of this embodiment is suitable for a relatively large-sized cathode ray tube.

FIG. 2 is a side sectional view of the main part of the built-in electron gun for explaining the second embodiment of the cathode ray tube according to the present invention.
The same parts as those in FIG. 1 are designated by the same reference numerals.

This embodiment differs from the first embodiment in that the side electron beam passage openings of the electron beam passage openings 97a, 97b, 97c formed at the bottom of the cup electrode 97 are far from the center electron beam. Since the side electron beam B is offset by d _{2 in the} direction,
The deflection amount of _S becomes strong, and the point where the three electron beams B _S and B _C are concentrated becomes short.

It can be said that the electron gun having the structure of this embodiment is suitable for a relatively small size cathode ray tube.

FIG. 3 is a side sectional view of the main part of the built-in electron gun for explaining the third embodiment of the cathode ray tube according to the present invention, and FIG. 4 is a front view seen from the direction of arrow AA in FIG. The same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, the focusing electrode 95 and the anode electrode 96 are used.
The present invention is applied to an electron gun of a type in which internal electrodes 95-1 and 96-1 for focusing control are respectively arranged inside.

Internal electrodes 95-1 and 96-1 for focusing control
Have the same shape, for example, the internal electrode 96 of the anode electrode 96.
As shown in FIG. 4, -1 is a center electron beam passage opening b which is a vertically long opening, and side electron beam passage openings a and c.
Together with the inner wall of the anode electrode 96 also forms a substantially vertically long opening. The focusing electrode 95 and the anode electrode 96 are made as large as possible to enlarge the effective diameter of the main lens.

The electron beam passage openings 97a, 97b and 97c formed at the bottom of the cup electrode 97 are circular openings,
On the converging electrode 95 and the electron beam interval S incident on the main lens formed by the facing surfaces of the anode electrode 96, the side of the electron beam passage hole 97a, 97c is d ₃ only inline outwardly, i.e. the center electron beam B Offset away from _C.

As a result, the deflection amount of the side electron beam B _S becomes weak, and the point where the three electron beams B _S and B _C are concentrated becomes long.

It can be said that the electron gun having the structure of this embodiment is suitable for a relatively large-sized cathode ray tube.

FIG. 5 is a side sectional view of the main part of the built-in electron gun for explaining the fourth embodiment of the cathode ray tube according to the present invention, and FIG. 6 is a front view seen from the direction of arrow AA in FIG. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals.

Similar to the third embodiment, this embodiment is an electron gun of the type in which focusing control electrodes 95-1 and 96-1 for focusing control are arranged inside the focusing electrode 95 and the anode electrode 96, respectively. The invention is applied.

Also in this embodiment, as in the third embodiment, the focusing control inner electrodes 95-1 and 96-1 have the same shape. For example, the inner electrode 96-1 of the anode electrode 96 is shown in FIG. , The center electron beam passage opening b is a vertically long opening, and the side electron beam passage openings a and c are the anode electrodes 96.
It also has a substantially vertical opening with the inner wall.

The electron beam passage openings 97a, 97b, 97c formed at the bottom of the cup electrode 97 are circular openings,
With respect to the electron beam interval S incident on the main lens formed by the facing surface of the focusing electrode 95 and the anode electrode 96, the side electron beam passage openings 97a and 97c are d ₃ inward in the inline arrangement direction, that is, the center electron beam B It is offset toward _C.

As a result, the deflection amount of the side electron beam B _S becomes strong, and the point where the three electron beams B _S and B _C are concentrated becomes short.

It can be said that the electron gun having the structure of this embodiment is suitable for a relatively small size cathode ray tube.

The internal electrode provided on the anode electrode 96 in the third and fourth embodiments may be replaced with the shape of the electron beam passage opening provided at the bottom of the cup electrode 97, and the position of the opening is inline. A desired beam deflection amount can be selected by offsetting a predetermined amount to the outside or inside of the direction, and the concentration point of the static convergence of the three electron gun beams can be set to the required position.

The present invention is not limited to the above embodiment, but a member, a getter or the like for positioning the electron gun in the vacuum envelope is provided on the phosphor screen side of the electrode forming the main lens. An electron gun having an electrode part for attachment, or a cathode ray tube and a color cathode ray tube having various electron guns having a structure for attaching a member for positioning the electron gun as a part of the anode, a getter, etc. Needless to say, it can be applied to the cathode ray tube.

[0069]

As described above, according to the present invention,
Focus characteristics can be improved in the entire current range of the electron beam, good resolution can be obtained, moiré in the small current range can be reduced, and the main part of the electron gun has a common specification regardless of the cathode ray tube size. It is possible to provide a cathode ray tube including an electron gun configured to correspond to various cathode ray tube sizes depending on an offset amount of an electron beam passage opening formed in a tubular electrode part connected to an anode.

Further, according to the manufacturing method of the present invention, the main specifications of the electron gun are made common, which is effective in cost reduction.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a built-in electron gun for explaining a first embodiment of a cathode ray tube according to the present invention.

FIG. 2 is a side sectional view of a main part of a built-in electron gun for explaining a second embodiment of the cathode ray tube according to the present invention.

FIG. 3 is a side sectional view of a main part of a built-in electron gun for explaining a third embodiment of the cathode ray tube according to the present invention.

FIG. 4 is a plan view of the built-in electron gun for explaining the third embodiment of the cathode ray tube according to the present invention as seen from the direction AA of FIG.

FIG. 5 is a side sectional view of a main part of a built-in electron gun for explaining a fourth embodiment of the cathode ray tube according to the present invention.

FIG. 6 is a plan view of the built-in electron gun for explaining the fourth embodiment of the cathode ray tube according to the present invention as seen from the direction AA of FIG.

FIG. 7 is a cross-sectional view illustrating the structure of a shadow mask type color cathode ray tube as an example of the color cathode ray tube.

FIG. 8 is a side view illustrating an example of an electron gun housed in a neck portion of a color cathode ray tube.

FIG. 9 is a side sectional view of an essential part for explaining an electrode configuration around a main lens in a conventional electron gun.

[Explanation of symbols]

95 Focusing Electrode 95a, 95b, 95c Electron Beam Passing Port of Focusing Electrode 96 Anode Electrode 96a, 96b, 96c Electron Beam Passing Port of Anode 97 Cylindrical Electrode 97-1 Bottom of Cylindrical Electrode 97a, 97b, 97c Cylindrical Electrode Electron beam passage opening.

Claims (4)

[Claims] 1. A vacuum envelope comprising a panel section having a phosphor screen, a neck section for accommodating an electron gun, and a funnel section connecting the panel section and the neck section, and a plurality of vacuum envelopes accommodated in the neck section. In a cathode ray tube including at least an electron gun for emitting an electron beam in an in-line arrangement, and a deflection device externally mounted on a transition region of a funnel portion and a neck portion of the vacuum envelope, the electron gun includes a focusing electrode and a focusing electrode. A main lens is composed of a focusing electrode and an anode electrode facing the focusing electrode, and a bottom has a plurality of electron beam passage openings for passing the plurality of electron beams, respectively, and is connected to the anode electrode coaxially with the electron gun axis. And a tubular electrode component for installing a member for positioning the electron gun in the vacuum envelope, the tubular electrode component being installed between the fluorescent electrode and the fluorescent screen. A cathode line characterized in that the center of a side electron beam passage opening of a plurality of electron beam passage openings provided on the anode side bottom portion is offset in the in-line arrangement direction with respect to an electron beam interval incident on the main lens. tube. 2. A vacuum envelope comprising a panel portion having a phosphor screen, a neck portion for accommodating an electron gun, and a funnel portion connecting the panel portion and the neck portion, and a plurality of vacuum envelopes accommodated in the neck portion. In a cathode ray tube including at least an electron gun that emits an electron beam in an in-line arrangement, and a deflection device that is packaged in a transition region of a funnel portion and a neck portion of the vacuum envelope, the electron gun includes a focusing electrode, A main lens is constituted by the focusing electrode and an anode electrode facing the focusing electrode, and an internal electrode for focusing control is provided so as to have a plurality of electron beam passage openings inside at least one of the focusing electrode and the anode electrode, The bottom has a plurality of electron beam passage openings for passing the plurality of electron beams, respectively, and is connected to the anode electrode coaxially with the electron gun axis to connect with the phosphor screen. A cylindrical electrode part for mounting a member for positioning the electron gun in the vacuum envelope, the plurality of electron beam passages provided on the anode side bottom of the cylindrical electrode part. A cathode ray tube, wherein a center of a side electron beam passage opening of the mouth is offset in an in-line arrangement direction with respect to an electron beam interval incident on the main lens. 3. The electron beam passage opening formed in the tubular electrode according to claim 2, wherein the internal electrode provided in the anode electrode is replaced by the shape and position of the electron beam passage opening formed in the bottom portion of the tubular electrode. The center of the side electron beam passage opening of the above is offset in the in-line arrangement direction with respect to the electron beam interval incident on the main lens. 4. A vacuum envelope comprising a panel portion having a phosphor screen, a neck portion for accommodating an electron gun, and a funnel portion connecting the panel portion and the neck portion, and a plurality of vacuum envelopes accommodated in the neck portion. An electron gun for emitting an electron beam in an in-line arrangement, and a method for manufacturing a cathode ray tube comprising at least a deflection device external to a transition region of a funnel portion and a neck portion of the vacuum envelope, wherein the plurality of electron beams are provided on a bottom portion. Has a plurality of electron beam passage openings for passing the respective electron beams, and is installed between the anode electrode coaxially with the electron gun axis and the fluorescent screen to position the electron gun in the vacuum envelope. The constituent electrodes of the electron gun except the tubular electrode component for attaching the member for performing are prepared as common specifications for the cathode ray tube size, and are formed on the bottom of the tubular electrode component. A method of manufacturing a cathode ray tube, characterized in that a corresponding cathode ray tube size is accommodated by connecting the cylindrical electrode parts having different offset amounts in the in-line arrangement direction of several electron beam passage openings to the anode. .