JPH0883575A - Color picture tube - Google Patents

Abstract

PURPOSE: To prevent the degradation of a breakdown voltage characteristic by an electric potential difference by electrically connecting a resistor to conductive contactors contacting with an inner wall of a neck, and bringing electric potentials near to each other. CONSTITUTION: An envelope to which a panel 7 composed of glass and a funnel 1 of a funnel shape are integrally joined, is provided, and a phosphor screen 8 composed of a three-color phosphor layer to emit light of blue, green and red is arranged on an inside surface of the panel 7. A shadow mask 6 is arranged on the inside so as to be opposed to this screen 8. An electron gun 20 to emit three electron beams 4B, 4G and 4R which are composed of a center beam 4G and a pair of side beams 4B and 4R passing through the same horizontal plane and are arranged in a row, is arranged in a neck 2 composed of glass of the funnel 1. A resistor 21 is also arranged in the neck 2 along the electron gun 20. Then, since the resistor 21 is electrically connected to a single or plural conductive contactors contacting with an inner wall of the neck 2, an electric potential difference between them can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube, and more particularly to a color picture tube having improved withstand voltage characteristics.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, in a color picture tube, three electron beams 4B, 4G and 4R emitted from an electron gun 3 arranged in a neck 2 of a funnel 1 are directed to the outside of the funnel 1. It is deflected by the magnetic field generated by the attached deflection yoke 5, the three electron beams 4B, 4G, 4R thereof are selected by the shadow mask 6, and the phosphor screen 8 formed on the inner surface of the panel 7 is horizontally and vertically scanned. As a result, a structure for displaying a color image is formed.

In such a color picture tube, in particular, the electron gun 3 is an in-line type electron gun which emits three electron beams arranged in a line consisting of a center beam passing through the same horizontal plane and a pair of side beams. 5 (a)
And a pincushion type horizontal deflection magnetic field 10 shown in (b).
There is a self-convergence in-line type color picture tube which self-focuses the three electron beams arranged in a row in combination with H and a deflection yoke which generates a barrel type vertical deflection magnetic field of 10V. This color picture tube can reduce the power consumption, contributes greatly to the improvement of the quality and performance of the color picture tube, and is the mainstream of the color picture tubes currently generally used. In FIGS. 5A and 5B, 4G is a center beam, and 4B and 4R are a pair of side beams.

However, in this self-convergence in-line type color picture tube, since the magnetic field generated by the deflection yoke is a non-uniform magnetic field in which the horizontal deflection magnetic field 10H is a pincushion type and the vertical deflection magnetic field 10V is a barrel type, the deflection angle is However, there is a problem in that the cross-sectional shape of the electron beam is distorted (deflection distortion) with the increase of the pulse width, and the resolution of the peripheral portion of the screen deteriorates. That is, as shown in FIG. 6, the beam spot 11a at the center of the screen can be formed into a substantially perfect circle,
The beam spot 11b in the peripheral portion of the screen has a low-luminance halo portion 13 extending in the vertical direction in addition to the elliptical high-luminance core portion 12 elongated in the horizontal direction, and the resolution in the peripheral portion of the screen is significantly deteriorated. The distortion of the beam spot at the peripheral portion of the screen is caused by the nonuniformity of the deflection magnetic field as shown in FIG.
Side beams 4R in (a) and (b), 4R
This is caused by the weakening of the horizontal focusing and the strengthening of the vertical focusing, as indicated by '.

As one of the means for improving the deterioration of resolution due to such deflection distortion, Japanese Unexamined Patent Application Publication No. Sho 64-64 relating to the present inventor.
JP-A-38947 discloses an electron gun shown in FIG. 7. This electron gun has three cathodes KB in a row,
KG, KR, first to sixth electrodes G1 to G6 of integral structure, which are sequentially arranged from the cathodes KB, KG, and KR in the phosphor screen direction, the shield cup C attached to the sixth electrode G6, and the fifth and fifth electrodes. It is formed in a structure having two intermediate electrodes Gm1 and Gm2 arranged between the six electrodes G5 and G6.

In this electron gun, the main lens which finally focuses the three electron beams on the phosphor screen is the fifth electrode G5 as the focusing electrode, the two intermediate electrodes Gm1 and Gm2, and the second accelerating electrode as the final accelerating electrode. Consists of 6 electrodes G6, part 2
The anode high voltage Eb supplied to the final accelerating electrode G6 is supplied to each of the intermediate electrodes Gm1 and Gm2 by dividing the voltage into a predetermined voltage by a resistor 15 arranged along the electron gun to serve as a focusing electrode. The fifth electrode G5 has a dynamic focus voltage V superposed on a constant DC voltage and a parabolic AC voltage which changes in synchronization with the deflection of the electron beam by the deflection yoke.
D (focusing voltage) is supplied.

With this structure, the main lens of the electron gun has the first electrode G5 and the intermediate electrode Gm1 facing the fifth electrode G5, which strongly focus the electron beam relatively vertically. Second quadrupole lens is formed, and by the intermediate electrode Gm2 and the sixth electrode G6 facing the intermediate electrode Gm2, the second electron beam diverges strongly in the vertical direction.
Quadrupole lens is formed. The first and second quadrupole lenses are balanced when the electron beam is directed to the central part of the screen, and a beam spot having a substantially circular shape is obtained in the central part of the screen. On the other hand, when the light is deflected to the peripheral portion of the screen, the focusing voltage of the fifth electrode G5 rises and the fifth electrode G5
Since the potential difference between the intermediate electrode Gm1 and the intermediate electrode Gm1 becomes small, the first quadrupole lens becomes weak, and the electron beam is relatively strongly affected by the second quadrupole lens. This cancels the deflection distortion caused by the strong vertical focusing.

By the way, in the electron gun having such a structure, it is necessary to stably supply a predetermined voltage to the intermediate electrodes Gm1 and Gm2 forming the main lens. When the voltages of the intermediate electrodes Gm1 and Gm2 change, the equilibrium between the first quadrupole lens and the second quadrupole lens is disturbed at the center of the screen, the beam spot becomes non-circular, and the focus characteristic deteriorates. Also, the change of the beam spot in the center of the screen is
The peripheral portion of the screen is also affected, and desired characteristics cannot be obtained even in the peripheral portion of the screen.

However, these intermediate electrodes Gm1, Gm2
The resistor 15 that supplies a predetermined voltage to the electron gun is arranged inside the thin neck made of glass along the electron gun and is close to the inner wall of the neck, so that the resistor 15 is always exposed to a strong electric field, and the withstand voltage is severe. Below. Particularly, the intermediate terminal portions 16 and 17 of the resistor 15 for supplying a predetermined voltage to the intermediate electrodes Gm1 and Gm2.
(See FIG. 7) is relatively close to the portion to which the anode high voltage is applied. Therefore, the surface potential of the inner wall of the neck near these intermediate terminal portions 16 and 17 is considerably high, and a large potential difference is generated between the surface potentials of the inner wall of the neck facing the intermediate terminal portions 16 and 17. As a result, a leak current may flow between the intermediate terminal portions 16 and 17 and the inner wall of the neck due to fine dust or burrs, and spark discharge may occur.
Withstand voltage characteristics are likely to deteriorate. In this case, the resistor 15
Since the resistance value between the high voltage input terminal portion 18 and the intermediate terminal portions 16 and 17 is apparently small, the potentials of the intermediate electrodes Gm1 and Gm2 become higher than the original potentials, and the focus characteristics are deteriorated. Become.

As a means for improving the deterioration of the withstand voltage characteristic of the electron gun, Japanese Patent Publication No. Sho 63-10859 discloses that a low voltage electrode of the electron gun is wrapped with a metal ring and the metal ring is heated to form a neck. A metal vapor deposition film is formed on the inner wall, and electrostatic induction between the metal ring and this metal vapor deposition film causes the surface potential of the neck inner wall of the metal vapor deposition film forming portion to be substantially the same as that of the low voltage electrode, and the surface of the neck inner wall A method of lowering the potential is shown. However, in this method, the decrease in the surface potential is limited to the portion where the metal vapor deposition film is formed and is localized, so that it is difficult to sufficiently compensate the withstand voltage characteristics.

[0011]

As described above, the three electron beams emitted from the electron gun and arranged in one row and passing through the same horizontal plane are arranged in a row so that the horizontal deflection magnetic field is a pincushion type and the vertical deflection magnetic field is a barrel type. A self-convergence in-line type color picture tube that is deflected by a magnetic field of a deflection yoke that generates a magnetic field has a problem that the cross-sectional shape of an electron beam is distorted as the deflection angle increases, and the resolution at the peripheral portion of the screen deteriorates.

As a means for improving the deterioration of resolution due to the deflection distortion, two intermediate electrodes are arranged between the focusing electrode and the final accelerating electrode which form the main lens of the electron gun, and the final electrode is attached to the intermediate electrode. The anode high voltage supplied to the accelerating electrode is divided by a resistor arranged in the neck along the electron gun to supply a predetermined voltage, and a constant DC voltage is supplied to the focusing electrode in synchronization with the deflection of the deflection yoke. There is a color picture tube that is adapted to supply a dynamic focus voltage in which a parabolic AC voltage that changes with time is superimposed.

However, when the resistor is arranged along the electron gun in this manner, the resistor approaches the inner wall of the neck,
Since the inner wall of the neck facing the intermediate terminal portion that supplies a predetermined voltage to the intermediate electrode is relatively close to the portion to which the high voltage of the anode is applied, there is a gap between these intermediate terminals and the surface potential of the inner wall of the neck facing the intermediate terminal. A large potential difference occurs, and the withstand voltage characteristics are likely to deteriorate. Also, in this case, the resistance value between the high voltage input terminal portion and the intermediate terminal portion of the resistor is apparently reduced,
There is a problem that the potential of the intermediate electrode becomes higher than the original potential, leading to deterioration of focus characteristics.

The present invention has been made to solve the above-mentioned problems, and the main gun for finally focusing the electron beam on the phosphor screen comprises a focusing electrode, an intermediate electrode and a final accelerating electrode. A resistor is arranged along this line, and in the color picture tube configured to divide the anode high voltage applied to the final acceleration electrode by this resistor to supply a predetermined voltage to the intermediate electrode, a predetermined voltage is applied to the intermediate electrode. An object of the present invention is to prevent deterioration of withstand voltage characteristics due to a potential difference between the intermediate terminal portion of the supplied resistor and the surface potential of the inner wall of the neck that faces the resistor.

[0015]

A main lens, which is arranged in a glass neck and focuses an electron beam emitted from an electron beam generator onto a phosphor screen, the main lens being at least the electron beam. An electron gun including a focusing electrode, one or more intermediate electrodes, and a final accelerating electrode sequentially arranged in the phosphor screen direction from the generator side, and a final accelerating electrode disposed along the electron gun in the neck. A color picture tube comprising a resistor for resistively dividing a high voltage applied to the intermediate electrode to supply a predetermined voltage to the intermediate electrode, and one or more conductive contacts for contacting the resistor with the inner wall of the neck. Electrically connected to.

[0016]

As described above, when the resistor disposed in the neck along the electron gun is electrically connected to the one or more conductive contacts that contact the inner wall of the neck, the conductive contact is obtained. The surface potential of the inner wall of the neck in the portion in contact with can be brought close to the potential of the resistor in the connecting portion of the conductive contact to reduce the potential difference between them. As a result, it is possible to prevent the deterioration of the withstand voltage characteristic due to a large potential difference between the intermediate terminal portion of the resistor and the surface potential of the inner wall of the neck that faces the conventional problem.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 2 shows a color picture tube which is one of the embodiments. This color picture tube has an envelope in which a panel 7 made of glass and a funnel-shaped funnel 1 made of glass are integrally joined, and the inner surface of the panel 7 emits blue, green, and red light. A phosphor screen 8 composed of a color phosphor layer is provided, and a shadow mask 6 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. On the other hand, inside the neck 2 made of glass of the funnel 1, a center beam 4G and a pair of side beams 4B that pass on the same horizontal plane.
, 4R arranged in a row in three electron beams 4B, 4G,
An electron gun 20 that emits 4R is arranged. Further, a resistor 21 is arranged in the neck 2 along the electron gun 20. The electron gun 20 and the resistor 21 will be described later. Further, the large-diameter portion 23 of the funnel 1 is provided with an anode terminal 24, and the large-diameter portion 23 of the funnel 1 is further provided.
From the inner surface of the inner surface of the neck to the inner surface of the adjacent portion of the neck 2
5 are provided. Then, the three electron beams 4B, 4G, 4R emitted from the electron gun 20 are deflected by a magnetic field generated by a deflecting device 5 mounted outside the funnel 1 to horizontally and vertically scan the phosphor screen 8. Is formed into a structure for displaying a color image.

The electron gun 21 is shown in FIGS. 1 and 2 (b).
As shown in FIG. 3, three cathodes KB, KG, KR arranged in a line in the horizontal direction (X-axis direction), and these cathodes KB
, KG and KR are separately heated by three heaters H (shown in FIG. 2B), and the first to sixth integrated structures are sequentially arranged from the cathodes KB, KG and KR in the phosphor screen direction. Electrodes G1 to G6, a shield cup C attached to the phosphor screen side of the sixth electrode G6, and two intermediate electrodes Gm1 having an integrated structure arranged between the fifth electrode G5 and the sixth electrode G6, Gm2, its heater H, cathodes KB, KG, KR, first to sixth electrodes G1
To G6 and the intermediate electrodes Gm1 and Gm2 are a pair of glass rods 2.
It is formed in a structure integrally fixed by 6.

The first and second electrodes G1 and G2 are plate electrodes having a relatively small plate thickness, and third to sixth electrodes G3 to G6.
Is a tubular electrode formed by abutting a plurality of cup-shaped electrodes, and the two intermediate electrodes Gm1 and Gm2 are plate electrodes having a relatively thin plate thickness.

The first and second electrodes G1 and G2 are
Corresponding to the three cathodes KB, KG, KR arranged in a row, three relatively small circular electron beam passage holes are formed in the horizontal direction. On the surface of the third electrode G3 facing the second electrode G2, there are three circular electron beam passage holes larger than the electron beam passage holes of the second electrode G2, and the fourth electrode G4 of the third electrode G3. On the opposite surface of, the larger three circular electron beam passage holes are similarly formed. Fourth
The electrode G4 is similarly formed with three circular electron beam passage holes of the same size as the electron beam passage holes on the surface of the third electrode G3 facing the fourth electrode G4. Fourth of fifth electrode G5
Three circular electron beam passage holes of the same size as the electron beam passage hole of the fourth electrode G4 are formed on the surface facing the electrode G4 and the intermediate portion, and the surface of the fifth electrode G5 facing the intermediate electrode Gm1 is also formed. Are similarly formed with three circular or non-circular electron beam passage holes. The intermediate electrodes Gm1 and Gm2 are provided with three circular electron beam passage holes of the same size as the electron beam passage holes on the surface of the fifth electrode G5 facing the fourth electrode G4. Since the pair of side beam passage holes of the intermediate electrode Gm2 concentrates the three electron beams, the arrangement direction of the electron beam passage holes (the arrangement direction of the three electron beams) with respect to the pair of side beam passage holes of the intermediate electrode Gm1. Eccentric to the outside). On the surface of the sixth electrode G6 facing the intermediate electrode Gm2, the same three circular or non-circular electron beam holes as the electron beam holes of the surface of the fifth electrode G5 facing the intermediate electrode Gm1 are similarly formed. Has been done. Also, this sixth electrode G6
On the side of the shield cup C, three circular electron beam passage holes having the same size as the electron beam passage holes of the intermediate electrode Gm1 are similarly formed. Further, three circular electron beam passage holes of the same size are similarly formed on the bottom of the shield cup C.

The resistor 21 is arranged along one glass rod 26 which integrally fixes the respective electrodes of the electron gun 20.
A high voltage input terminal portion 28 is provided at one end portion, a ground connection terminal portion 29 is provided at the other end portion, and four intermediate terminal portions 30a to 30d are provided at an intermediate portion. These four intermediate terminal portions 30a to 30d
Of these, the two intermediate terminal portions 30c and 30d are arranged such that the intermediate terminal portions 30a and 30b are sandwiched therebetween.
It is installed close to a and 30b. The high voltage input terminal portion 28 is connected to an anode terminal provided on a large-diameter portion of the funnel through an inner conductive film 25 provided on the inner surface of the funnel, and the ground connection terminal portion 29 connects the stem pin 31 to It is grounded either directly or via a variable resistor 32 arranged outside the tube. Also, of the four intermediate terminal portions 30a to 30d, two intermediate terminal portions 30a, 30d
b are connected to the intermediate electrodes Gm1 and Gm2 of the electron gun 21, respectively.

Further, in this color picture tube, the intermediate terminal portions 30a, 3 connected to the intermediate electrodes Gm1, Gm2 are provided.
0b is provided with two conductive contacts 34a, 34b which come into contact with the inner wall of the neck 2 at a portion opposite to 0b.
Intermediate terminal portions 30c provided close to 0a and 30b,
It is connected to 30d.

In such a structure, a voltage in which a video signal corresponding to an image is superimposed on a DC voltage of about 180 V is applied to each of the cathodes KB, KG and KR of the electron gun 20, and the first electrode G1 is grounded. The second electrode G2 and the fourth electrode G4 are connected in the tube, and a voltage of about 800 V is also connected in the tube to the third electrode G3 and the fifth electrode G5 (focusing electrode).
A dynamic focus voltage VD in which a parabolic AC voltage that changes in synchronization with the deflection of the electron beam by the deflection yoke is superimposed on a DC voltage of approximately 8 to 9 kV is applied via the stem pin 31 at the end of the neck 2, respectively. It Further, an anode high voltage Eb of about 30 kV is applied to the sixth electrode G6 (final acceleration electrode) via the anode terminal, the inner conductive film 25 and the like. Further, a resistor 2 is provided on the intermediate electrodes Gm1 and Gm2.
The anode high voltage supplied to the high voltage input terminal portion 28 at one end of 1 is resistance-divided, and the intermediate terminal portions 30a and 30b
Voltages of about 40% and about 65% of the anode high voltage are applied, respectively.

By applying such a voltage, the electron gun 20 forms an electron beam generating portion by the cathodes KB, KG, KR and the first and second electrodes G1, G2, and the second, third electrodes G2, A prefocus lens is formed by G3, and an auxiliary lens is formed by the third to fifth electrodes G3 to G5.
The fifth lens G5, the two intermediate electrodes Gm1 and Gm2, and the sixth electrode G6 form a main lens. This main lens is
A first quadrupole lens for focusing the electron beam formed by the cup electrode G5T on the side of the fifth electrode G5 on the side of the intermediate electrode Gm1 and the intermediate electrode Gm1 relatively more strongly in the vertical direction than in the horizontal direction, and the intermediate electrode Gm2. A second quadrupole lens which relatively diverges the electron beam formed by the sixth electrode G6 and the cup electrode G7B on the side of the intermediate electrode Gm2 more strongly in the vertical direction than in the horizontal direction. The formation of such a quadrupole lens is performed by adjusting the plate thickness of the electron beam passage hole forming surface of the cup electrode G5T of the fifth electrode G5 on the side of the intermediate electrode Gm1 and the cup electrode G7B of the sixth electrode G6 on the side of the intermediate electrode Gm2. 1.0mm or less,
It can be formed by increasing the lens curvature in the horizontal direction and making the lens strength in the horizontal direction relatively weaker than that in the vertical direction.

By forming the above-mentioned electron lens, the cathode K
The electron beams emitted from B, KG and KR form a crossover in the vicinity of the first and second electrodes G1 and G2 and then diverge, and are formed by the prefocus lens formed by the second and third electrodes G2 and G3. Pre-focused by the third
Through the auxiliary lens formed by the fifth electrodes G3 to G5, and then finally focused on the phosphor screen by the main lens formed between the fifth and sixth electrodes G5, G6.

In this case, the two quadrupole lenses of the main lens are in an equilibrium state when the electron beam goes to the center of the phosphor screen without being deflected by the deflection yoke.
A substantially circular beam spot is formed on the phosphor screen. On the other hand, when the electron beam is deflected by the magnetic field generated by the deflection yoke and moves toward the peripheral portion of the phosphor screen, the AC voltage component of the dynamic focus voltage applied to the fifth electrode G5 rises and the fifth electrode The potential difference between G5 and the intermediate electrode Gm1 becomes small, and the lens action of the first quadrupole lens formed by the fifth electrode G5 and the intermediate electrode Gm1 becomes weak. As a result, the lens action of the second quadrupole lens formed by the intermediate electrode Gm2 and the sixth grid G6 becomes relatively strong, and the electron beam becomes relatively vertically focused by the magnetic field generated by the deflection yoke. Offset the deflection distortion of. As a result, a small circular beam spot without distortion can be formed on the entire surface of the phosphor screen.

By the way, in general, when a high anode high voltage is applied to the final acceleration electrode of the electron gun through the inner conductive film provided on the inner surface of the funnel, the inner conductive film on the inner surface of the neck made of glass is not provided. The part is electrostatically charged. The surface potential of the inner surface of the neck due to this charging is generally uniform in the material of the neck and has a smooth inner wall. Therefore, as indicated by a line 36 in FIG. The potential gradient gradually decreases in the direction of the stem that seals the end, and the potential becomes almost 0 near the stem pin.

However, like the color picture tube of this example, two conductive contacts that contact the inner wall of the neck 2 at the portion facing the intermediate terminal portions 30a and 30b of the resistor 21 connected to the intermediate electrodes Gm1 and Gm2. 34a and 34b to the intermediate terminal portion 30
It is provided close to the intermediate terminal portion 30a which is connected to the intermediate terminal portions 30c and 30d which are provided so as to sandwich a and 30b and which supplies the intermediate electrode Gm1 with a voltage of about 40% of the anode high voltage. The intermediate terminal portion 30c is supplied with a slightly lower anode high voltage of about 35% and the intermediate electrode Gm2 is supplied with an anode high voltage of about 65%.
When a voltage of about 70% of the anode high voltage, which is slightly higher than that, is applied to the intermediate terminal portion 30d provided close to the surface of the inner surface of the neck 2 where the conductive contacts 34a and 34b come into contact with each other. The potential is forced to be approximately the same potential as the conductive contacts 34a, 34b. Thereby, the conductive contact 3
As shown by the broken line 37 in FIG. 3, the conductive surface of the conductive contacts 34a, 34b is
The potential gradient gradually changes between b and approaches the potential of the intermediate terminal portions 30a and 30b of the potential gradient of the resistor shown by the broken line 38.

As a result, the potential difference between the intermediate terminals 30a and 30b connected to the intermediate electrodes Gm1 and Gm2 and the inner wall of the neck 2 at the portions facing each other becomes small, and the intermediate terminal portion and the inner wall of the neck of the conventional resistor are generated. It is possible to improve the withstand voltage characteristics by suppressing the leak current between the two.

In the above embodiment, the number of conductive contacts that contact the inner wall of the neck is two, but this conductive contact is
The number is not limited to two, and may be one or three or more.

Further, in the above embodiment, the intermediate contact portion is provided separately from the intermediate terminal portion connected to the intermediate electrode to connect the conductive contact. However, this conductive contact is connected to the intermediate electrode. May be directly connected to.

In the above embodiment, the color picture tube provided with the electron gun for applying the dynamic focus voltage to the fifth electrode has been described, but the present invention includes the electron gun for not applying the dynamic focus voltage to the fifth electrode. It can also be applied to color picture tubes.

[0034]

The main lens for focusing the electron beam emitted from the electron beam generator on the phosphor screen is at least one focusing electrode sequentially arranged in the phosphor screen direction from the electron beam generator side. The electron gun consisting of the intermediate electrode and the final accelerating electrode and the glass neck along with the electron gun are arranged, and the high voltage applied to the final accelerating electrode is resistance-divided to apply a predetermined voltage to the intermediate electrode. In a color picture tube including a supplying resistor, when the resistor is electrically connected to one or more conductive contacts that contact the inner wall of the neck, the inner wall of the neck that contacts the conductive contact is formed. It is possible to reduce the potential difference between them by bringing the surface potential of the element closer to the potential of the resistor at the connecting portion of the conductive contact. As a result, it is possible to prevent the deterioration of the withstand voltage characteristic caused by the leakage current flowing due to the potential difference between the intermediate terminal portion of the resistor and the surface potential of the inner wall of the neck that faces the conventional problem.

[Brief description of drawings]

1 (a) and 1 (b) are diagrams showing the configuration of an electron gun of a color picture tube which is an embodiment of the present invention.

FIG. 2 (a) is a view showing a configuration of a color picture tube which is an embodiment of the present invention, and FIG. 2 (b) is a view showing a neck portion in which the electron gun is arranged.

FIG. 3 is a diagram for explaining a potential gradient of a neck inner wall of a color picture tube which is an embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional color picture tube.

5 (a) is a diagram showing a pincushion type horizontal deflection magnetic field, and FIG. 5 (b) is a diagram showing a barrel type vertical deflection magnetic field.

FIG. 6 is a diagram showing a beam spot shape on a screen.

7 (a) and 7 (b) are diagrams showing a configuration of a conventional electron gun of a color picture tube, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Funnel 2 ... Neck 4B, 4G, 4R ... 3 Electron beam 8 ... Phosphor screen 20 ... Electron gun 21 ... Resistor 26 ... Glass rod 28 ... High voltage input terminal 29 ... Ground connection terminal 30a-30 ... Intermediate Terminal portions 34a, 34b ... Conductive contacts Gm1 ... Intermediate electrode Gm2 ... Intermediate electrode G5 ... Fifth electrode G6 ... Sixth electrode

Claims (1)

[Claims] 1. A main lens, which is disposed in a neck made of glass and focuses an electron beam emitted from an electron beam generator onto a phosphor screen, the main lens being at least the electron beam generator side. To an electron gun including a focusing electrode, one or more intermediate electrodes and a final accelerating electrode sequentially arranged in the phosphor screen direction, and the final accelerating electrode disposed along the electron gun in the neck. A color picture tube comprising a resistor for dividing a high voltage applied to the intermediate electrode to supply a predetermined voltage to the intermediate electrode, wherein the resistor is one or a plurality of conductive members contacting the inner wall of the neck. A color picture tube characterized by being electrically connected to a contact.