JP2001035422A - Cathode-ray tube and display device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube and display device capable of suppressing distortion of the screen originating from electrostatic charging on a junction member and reducing the discharge current which flows into an electron gun from a getter supporting structure. SOLUTION: A cathode-ray tube includes a getter spring 13 as a getter supporting structure equipped with a first metal plate 11 fixed to an electron gun, a second metal plate 12 to hold a getter material 19, and a junction member 13 having resistivity whereto the first 11 and second metal plates 12 are coupled, wherein the junction member 13 is arranged so that the distance between the two metal plates 11 and 12 as creeping on the surface of the member 13 is made longer than the straight distance L between the plates 11 and 12.

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 a display device using the same.

[0002]

2. Description of the Related Art In a cathode ray tube, for example, an internal conductive film to which a high voltage is applied is formed over an inner surface of a funnel glass and a part of a neck portion. And the like, and supplies a high voltage to this high-voltage electrode. The above-mentioned internal conductive film also functions as a resistor layer for controlling a discharge current. When the discharge current generated in the cathode ray tube flows to the high-voltage electrode through the internal conductive film, a discharge occurs between the high-voltage electrode and the low-voltage electrode adjacent thereto, thereby temporarily distorting an image or causing a discharge to flow to the low-voltage electrode. When the current reaches the cathode of the electron gun, a malfunction such as damaging the cathode or damaging a drive circuit connected to the cathode may occur. For this reason, the above-mentioned internal conductive film controls the discharge current generated in the cathode ray tube, thereby preventing the above problem from occurring.

On the other hand, from the electron gun in the cathode ray tube to the inner surface of the funnel glass on which the above-mentioned internal conductive film is formed,
2. Description of the Related Art There is known a cathode ray tube provided with a getter spring made of a band-shaped metal plate that holds a getter material made of a material such as barium (Ba) at one end for maintaining a degree of vacuum in the cathode ray tube. In such a cathode ray tube, when the getter material is discharged, the discharge current flows through the getter spring to the high-voltage electrode of the electron gun, which may cause the above-described problem. For this reason, for example,
By relaying the getter spring by a relay member made of an insulating material like a cathode ray tube disclosed in 23052 publication or the like, the discharge current from the getter material is prevented from flowing to the high-voltage electrode of the electron gun, This prevents image distortion and prevents damage to the drive circuit.

[0004]

However, in the cathode ray tube having the getter spring relayed by the relay member made of the insulating material, for example, an error in assembling the getter spring, an error in mounting the getter spring to the electron gun, etc. Due to the above, when the electron beam emitted from the electron gun passes near the relay member, a part of the electron beam is directly irradiated to the relay member, or a slight leak beam which is a repulsive electron of the electron beam is generated. The relay member may be irradiated, and thereby the relay member is charged. When the relay member is charged, the trajectory of the electron beam passing through the vicinity of the relay member is bent by an electric field from the relay member, and distortion of a raster, which is a scanning trajectory of the electron beam on the phosphor screen, may occur. . The distortion of the raster is particularly remarkable when dirt is attached to the relay member. The dirt on the relay member is caused not only by foreign matter mixed in the cathode ray tube but also by gettering of the getter material, for example. Barium oxide (BaO)
It is also caused by For this reason, the contamination of the relay member tends to increase over time with the use of the cathode ray tube.

[0005] In order to solve the above-mentioned problems, it can be solved to some extent by improving the assembling accuracy of the getter spring, the mounting position of the getter spring to the electron gun, and the like, or by providing a metal shield on the relay member. Although it can be considered, there is a disadvantage that the number of assembling steps and the number of parts increase. Further, in order to prevent the distortion of the raster caused by the charging of the relay member, it is conceivable to use a conductive member as the relay member. Although the charging can be prevented, there is a disadvantage that the peak value of the discharge current flowing from the getter material to the electron gun through the getter spring increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a cathode ray tube capable of reducing a discharge current flowing into an electron gun from a getter supporting structure while suppressing distortion of a screen due to charging of a relay member. It is an object to provide a display device.

[0007]

According to the present invention, a first metal member fixed to an electron gun, a second metal member holding a getter material, and the first and second metal members are provided. A cathode ray tube having a getter supporting structure including a relay member made of a resistive or insulating material connected to each other, wherein the relay member is provided between the first and second metal members. The distance along the surface is longer than the linear distance between the first and second metal members.

[0008] The relay member is made of a resistive ceramic.

[0009] The relay member has a volume resistance of about 10 ² Ω · cm to about 10 ¹² Ω · cm at 20 ° C.

[0010] The relay member has a volume resistance of about 10 ⁴ Ω · cm to about 10 ¹⁰ Ω · cm at 20 ° C.

[0011] On the surface of the relay member, irregularities are provided between the connecting portions with the first and second metal members.

[0012] A plurality of grooves are formed around the junction member along a space between the joints with the first and second metal members.

The relay member may be made of iron, manganese, alumina, forsterite, steatite or zirconia.
Neodymium or titanium oxide is added.

The first and second metal members are formed of strip-shaped metal plates, and are respectively connected to the relay member by rivets.

The getter support structure is provided along an inner wall of the funnel glass, and the relay member is located near a deflection range of an electron beam emitted from the electron gun.

Further, in the display device according to the present invention, the first metal member fixed to the electron gun, the second metal member holding the getter material, and the first and second metal members are respectively provided. A cathode ray tube having a getter supporting structure having a connected resistive relay member; and controlling emission, focusing, and acceleration of an electron beam by the electron gun based on a video signal, and controlling deflection of the electron beam. A display circuit comprising a driving circuit, wherein a distance between the first and second metal members along a surface of the relay member is between the first and second metal members. Is longer than the straight line distance.

Further, according to the present invention, a first metal member fixed to an electron gun, a second metal member holding a getter material, and the first and second metal members are respectively connected. A cathode ray tube having a getter supporting structure including an insulating relay member, wherein the relay member has a distance between the first and second metal members along a surface of the relay member between the first and second metal members. The length is longer than the linear distance between the second metal member.

In the present invention, when a discharge to the getter material occurs, a discharge current tends to flow from the second metal member toward the first metal member. At this time, since a resistive relay member exists between the second metal member and the first metal member, the current flowing on the surface of the resistive relay member is reduced by the distance along the surface of the relay member. Since the length is longer than the linear distance between the first and second metal members, it becomes difficult to flow, and the magnitude of the current reaching the high-voltage electrode of the electron gun is suppressed. In addition, since the relay member is resistive, the relay member does not become charged because it has conductivity. Similarly, when the relay member is insulative, the relay member is charged, but the discharge current that tends to flow to the surface is difficult to flow because the distance along the surface is extended, and the high-voltage electrode of the electron gun is difficult to discharge. Is suppressed. Furthermore, the surface of the relay member is not made a smooth curved surface or the like to extend the distance along the surface, but by providing irregularities or grooves, the effect of reducing the discharge current flowing on the surface is great.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an example of a configuration of a display device to which the present invention is applied. As shown in FIG. 1, the display device 1 includes a cathode ray tube 2, a tuner circuit 31, a video receiving circuit 32, a video output circuit 33, a synchronous deflection circuit 34, a color signal circuit, which constitute a driving circuit for driving the cathode ray tube 2. 35, medium / low voltage generating circuit 36 and high voltage generating circuit 3
7 are provided.

The cathode ray tube 2 has a panel glass 3 and a funnel glass 4. The panel glass 3 and the funnel glass 4 are fused via a frit glass 8. The inner surface of the panel glass 3 is irradiated with an electron beam to form, for example, a phosphor layer 5 that respectively fluoresces red, green, and blue, and the other surface of the phosphor layer 5 includes, for example, aluminum. An evaporation layer 6 is formed. Further, an aperture grille 7 for selecting colors of three electron beams is provided in the panel glass 2 at a predetermined distance from the aluminum deposition layer 6.

An inner conductive film 9 made of, for example, a carbon film is formed on the inner wall of the funnel glass 4 of the cathode ray tube 2, and an electron gun 51 is built in the neck 4 a of the funnel glass 4. The internal conductive film 9 is electrically connected to an anode button (not shown) provided on the funnel glass 4 and is also electrically connected to the electron gun 51. A deflection yoke 61 for generating a magnetic field that deflects the electron beam emitted from the electron gun 51 in the horizontal and vertical directions is provided on the outer periphery of the funnel glass 4 of the cathode ray tube 2.

A getter spring 10 as a getter supporting structure is provided from the electron gun 51 along the inner wall of the funnel glass 4 of the cathode ray tube 2.

FIG. 2 is a diagram showing a configuration around the neck portion 4a of the cathode ray tube 2 shown in FIG. As shown in FIG. 2, the electron gun 51 includes a first electrode G1, a second electrode G2, and a third electrode G3 which are sequentially arranged in common for three cathodes KR, KG, and KB corresponding to red, green, and blue. It has an electrode G3, a fourth electrode G4, and a fifth electrode G5, and a shield cup 53 is provided at the tip of the fifth electrode G5. The first electrode G1, the second electrode G2, the third electrode G3, the fourth electrode G4, and the fifth electrode G5 are respectively fixedly supported by a support member 54 made of an insulating material such as glass. The third electrode G3 and the fifth electrode G5 are connected, for example, to the conductive line 55
And an anode voltage is supplied to the third electrode G3 and the fifth electrode G5. This anode voltage is a high voltage supplied from an anode button (not shown) provided on the funnel glass 4 through the internal conductive film 9.

The fourth electrode G4 is electrically connected to a terminal pin 52 penetrating the stem portion 4b of the neck portion 4a of the funnel glass 4 by a conductive wire 56, and the second electrode G2 is connected to the terminal pin 52 and the conductive wire 57. The first, second, and fourth electrodes G1 are electrically connected, and the first electrode G1 is electrically connected to the terminal pin 52 by a conductive line 58.
1, G2 and G4 are supplied with medium / low voltage through each terminal pin 52.

As shown in FIG. 2, the end of the first metal plate is fixed to the shield cup 53 of the electron gun 51, and the getter spring 10 is arranged along the inner wall of the funnel glass 4. The structure of the getter spring 10 will be described later.

The driving circuit for driving the cathode ray tube 2 includes, for example, a tuner circuit 31, a video receiving circuit 32, a video output circuit 33, a synchronous deflection circuit 34, a color signal circuit 35, a medium / low voltage generating circuit 36 and a high voltage generating circuit 37. have. The tuner circuit 31 is, for example, a circuit that selects a desired reception channel from a television signal of a predetermined frequency band obtained by a reception antenna, converts the channel into an intermediate frequency signal 31s, and outputs the intermediate frequency signal 31s. The video receiving circuit 32, for example, amplifies and detects the intermediate frequency signal 31s to convert it into a color video signal,
A luminance signal Y is created from the color video signal, and the luminance signal Y is output to the video output circuit 33. The video receiving circuit 32 outputs the color video signal as a signal 32sa to the synchronous deflection circuit 34 and the color signal circuit 35.

The video output circuit 33 generates RGB signals to be supplied to the respective cathodes KR, KG, KB of the electron gun 51 from the luminance signal Y and the color difference signals RY, GY, BY. Is output. The color signal circuit 35 creates color difference signals R-Y, G-Y, and B-Y based on the color video signal 32sa input from the video reception circuit 32, and outputs it to the video output circuit 33.

The synchronous deflection circuit 34 separates the vertical and horizontal synchronization signals from the color video signal 32sa input from the video reception circuit 32, and outputs a vertical deflection sawtooth signal synchronized with the vertical synchronization signal. And a horizontal deflection circuit for generating a horizontal deflection sawtooth signal synchronized with a horizontal synchronization signal. The vertical deflection circuit and the horizontal deflection circuit are composed of a vertical deflection coil and a horizontal deflection coil of the deflection yoke 61. Are output to the respective coils. The medium / low voltage generating circuit 36 supplies the medium / low voltage to the electron gun 51 through the terminal pin 6 of the cathode ray tube 2 from a horizontal output signal input from the horizontal deflection circuit of the synchronous deflection circuit 34 using a flyback transformer, for example. Output voltage.
The high-voltage generating circuit 37 uses a flyback transformer to generate a high voltage of, for example, about 30 kV to be applied to the anode button of the cathode ray tube 2 from a horizontal output signal input from the horizontal deflection circuit of the synchronous deflection circuit 34. appear.

In the display device 1 having the above configuration, for example, each of the cathodes KR, KG, KB of the electron gun 51 based on a television signal of a desired frequency selected by the tuner circuit 31.
Electrons are emitted from the first to fifth electrodes G1 of the electron gun 51.
To G5, a voltage is applied to each of them to focus and accelerate the electron beam, and the phosphor layers 5
Is irradiated. At the same time, a magnetic field for deflecting the electron beam in the vertical and horizontal directions is generated from the deflection yoke 61, and the electron beam scans the phosphor layer 5.

Description of the Getter Spring FIG. 3 is a diagram showing the structure of the above-mentioned getter spring, and FIG. 4 is an enlarged sectional view showing the periphery of the relay member 13. As shown in FIG. 3, the getter spring 10 has a first metal plate 11, a second metal plate, and a relay member 13.

The first metal plate 11 is made of, for example, a band-shaped thin metal plate made of a metal material such as a copper plate. One end of the first metal plate 11 is connected to the shield cup 53 of the electron gun 51 by, for example, spot welding or brazing. The other end is connected to the relay member 13 by means. The second metal plate 12 is formed of, for example, a band-shaped thin metal plate made of a metal material such as a copper plate, and has, at one end, a getter material 19 made of, for example, barium (Ba), and has the other end relayed. It is connected to the member 13. Also, the second metal plate 1
2, a contactor 21 made of the same material as that of the second metal plate 12 is provided.
Is in contact with the internal conductive film 9 of the cathode ray tube 2 as shown in FIG.

As shown in FIG. 4, the first and second metal plates 11 and 12 are connected to the relay member 13 so as to be separated by a linear distance L between both ends of the first and second metal plates 11 and 12. Is placed against. First and second metal plates 11,
12 are formed with mounting holes 11a and 12a, respectively, and the relay member 13 is formed with through holes 13c and 13d corresponding to the mounting holes 11a and 12a, respectively. The connection member 12 and the relay member 13 are connected and fixed by rivets 17, 18 inserted into the mounting holes 11a, 12a and the through holes 13c, 13d, respectively. Further, engaging holes 11b and 12b are formed in the first and second metal plates 11 and 12, respectively, and protrusions 13a and 13b are formed in the relay member 13 corresponding to the engaging holes 11b and 12b, respectively. And the engagement holes 11b,
12b and the projections 13a, 13b, the first
In addition, the rotation of the second metal plates 11 and 12 with respect to the relay member 13 is restricted.

As shown in FIG. 1, the relay member 13 is located near the deflection area of the electron beam B emitted from the electron gun 51. Also, as shown in FIG.
A plurality of grooves 13e are formed on the outer periphery of 3 along the end portions of the first and second metal plates 11 and 12. Since a plurality of grooves 13e are formed on the surface of the relay member 13, the distance between the ends of the first and second metal plates 11, 12 along the surface of the relay member 13 (hereinafter referred to as creepage distance). Is longer than the linear distance L. For example, in the structure shown in FIG. 4, the linear distance L is 5 mm,
The creepage distance is about 10 mm. Also, the relay member 1
The formation area and the non-formation area of the third groove 13e have substantially the same sectional area.

Further, the relay member 13 is made of, for example, a resistive (conductive) ceramic. Specifically, the relay member 13 is made of a material such as alumina, forsterite, steatite, or zirconia,
Conductivity is provided by a resistive ceramic to which an oxide such as neodymium or titanium is added. The volume resistance value of the relay member 13 is, for example, about 10 ² Ω · cm to about 10 ¹² Ω · cm at 20 ° C., and preferably about 10 ⁴ Ω · cm to about 10 ¹⁰ Ω · cm. is there.

In the cathode ray tube 2 provided with the getter spring 10 described above, for example, when the inner surface of the cathode ray tube 2 is charged up, for example, a discharge may occur in the getter material 19. The current caused by this discharge reaches the relay member 13 through the second metal plate 12. Relay member 13
Since is conductive, the current transmitted from the second metal plate 12 flows inside and on the surface of the relay member 13 and tends to flow to the first metal plate 11. The discharge current flowing to the first metal plate 11 flows to the fifth electrode G5, which is the high-voltage electrode of the electron gun 51, and temporarily distorts the image of the cathode ray tube 2 or the adjacent relatively low-voltage fourth electrode. G4 and the third electrode G
3, the electrodes fall to the low-voltage second and first electrodes G2 and G1 to damage the cathodes KR, KG and KB, and to the stem portion 4b.
Through the terminal pins 52 penetrating the drive circuit, and may damage the drive circuit.

In the present embodiment, the current flowing on the surface of the relay member 13 is difficult to flow because the creepage distance of the relay member 13 is extended, and the current flows straight because the plurality of grooves 13e are formed. It becomes harder to flow than it flows. On the other hand, since the substantial cross-sectional area of the relay member 13 is the same as the case where the plurality of grooves 13e of the relay member 13 are not formed, the second metal plate 12 to the first metal plate 11
The peak value of the discharge current flowing through the relay member 13 is suppressed. As a result, the electron gun 51 is moved from the first metal plate 11.
The peak value of the discharge current flowing through the fifth electrode G5 can be suppressed.

On the other hand, since the relay member 13 has conductivity, a part of the electron beam emitted from the electron gun 51 is directly applied to the relay member 13 or a slight leakage beam which is a repulsive electron of the electron beam B is generated. Even when the relay member 13 is irradiated, the relay member 13 is not charged. Thus, the trajectory of the electron beam B passing near the relay member 13 is not bent, and the generation of image distortion (raster distortion) on the phosphor screen of the electron beam can be prevented.

As described above, according to the present embodiment, by imparting conductivity to the relay member 13, it is possible to prevent the relay member 13 from being charged and to prevent the occurrence of raster distortion. Further, the assembly accuracy of the getter spring 10 and the assembly accuracy of the getter spring 10 to the cathode ray tube 2 can be reduced. As a result, floating of the getter spring 10 from the inner wall of the funnel glass 4 and deformation,
More room for twisting and easier handling. In addition, according to the present embodiment, by forming the plurality of grooves 13e on the outer periphery of the relay member 13, it is possible to suppress the peak value of the discharge current flowing into the fifth electrode G5, which is the high voltage electrode of the electron gun 1. it can. In this embodiment, the relay member 1
3, the surface of the relay member 13 is formed as a discontinuous surface, such as a plurality of grooves 13e, instead of simply extending the length of the relay member 13. 13 has a great effect of preventing a discharge current flowing through the surface. As a result, according to the present embodiment, it is possible to suppress the occurrence of problems such as the image of the cathode ray tube 2 being temporarily distorted, the cathodes KR, KG, and KB being damaged, and the driving circuit of the cathode ray tube 2 being damaged. Further, it is possible to reduce the cost required for a discharge countermeasure for adding a spark gap or the like to the drive circuit of the cathode ray tube 2.

Next, verification results of the effect of suppressing the distortion of the raster and the effect of suppressing the discharge current in the cathode ray tube having the above configuration will be described. First, the results of verifying the effect of suppressing the distortion of the raster by using the relay member 13 as a resistive material will be described. FIGS. 5 and 6 show the electron gun 5 of the cathode ray tube 2.
1 deflects the electron beam B from the funnel glass 4
CRT 2 when scanning inside a circle formed by the inner wall of
FIG. 5 shows the result immediately after the start of use of the cathode ray tube 2 (before aging), and FIG. 6 shows the result obtained by visually observing the image formed on the phosphor layer 5 of FIG.
The results after a lapse of time (after aging) are shown.

The observations before and after aging were made for the following reasons. That is, the contamination of the relay member 13 is caused by the fact that the barium (Ba) of the flashed getter material 19 is absorbed by the gas in the cathode ray tube 2 and the barium oxide (BaO)
This barium oxide is insulated and has a charging property.
For this reason, if the barium oxide increases with the use of the cathode ray tube 2 and adheres to the relay member 13, the relay member 13 is likely to be charged, and the distortion of the raster may increase. is there.

The results shown in FIGS. 5 and 6 show that in Example 1, a resistive ceramic having a volume resistivity of about 10 ⁴ Ω · cm (for example, a metal oxide was added to forsterite to impart conductivity) Relay member 1 made of
3 is used. Example 2 has a volume resistance value of about 1
0 of ⁸ Omega · cm resistant ceramic (e.g., a metal oxide obtained by imparting conductivity is added to the zirconium) is a case where a relay member 13 made. Example 3
This is a case where a relay member 13 made of a resistive ceramic having a volume resistance of approximately 10 ¹² Ω · cm (for example, a material obtained by adding a metal oxide to alumina to impart conductivity) is used.
Comparative Example 1 is a case where the relay member 13 made of an insulating ceramic (for example, alumina) having an estimated volume resistance of about 10 ¹⁷ Ω · cm or more is used.

Further, two observation examples are shown for the case where styrofoam, which is a kind of synthetic resin containing bubbles, is baked on the surface of the relay member 13 of each of Examples 1 to 3 and Comparative Example 1. In addition, one observation example was shown for each case where the styrofoam was not baked. Note that the reason why the styrofoam is baked on the surface of the relay member 13 is that the relay member 13 is easily charged. This is because it is impossible to observe the influence of the charging without baking the styrofoam.

The circle 102 shown in FIG. 5 and FIG.
The outline of the trajectory of the electron beam on the phosphor layer 6, the trapezoid 104 is the shadow of the relay member 13 on the phosphor layer 6, and the hatched area 105 is the electron beam B due to the charging of the relay member 13.
3 shows a region on the phosphor layer 6 where the trajectory is bent and no light is emitted. Further, A, B, C, shown in FIGS.
D is the result of the determination of the degree of raster distortion, and indicates that A is the best, B and C are inferior in the order of raster distortion, and D is the worst.

5 and 6, when Examples 1 to 3 and Comparative Example 1 are compared, it is understood that the use of the relay member made of insulating ceramic causes a large bending of the trajectory of the electron beam B. That is, in Examples 1 to 3, charging is suppressed by using a relay ceramic as a resistive ceramic, and as a result, raster distortion can be suppressed.
Further, in the comparison between the first and second embodiments and the third embodiment, when the volume resistance value increases as in the third embodiment, the effect of suppressing charging is reduced and the degree of raster distortion is deteriorated. Understand. According to the observation results, the volume resistance value is approximately 10 ⁴ Ω · c.
The degree of raster distortion was excellent when the value was not less than m and not more than about 10 ¹⁰ Ω · cm.

In comparison of the results of FIG. 5 and FIG. 6, the degree of raster distortion in Comparative Example 1 is greatly deteriorated before aging and after aging, but is substantially different between Examples 1 to 3. It turns out that there is no. That is, when the relay member is contaminated with BaO in accordance with the use of the cathode ray tube 2, the charging increases in Comparative Example 1, but in Examples 1 to 3.
In the third embodiment, charging is suppressed. Thus, by providing the relay member 13 with conductivity, even if the relay member 13 is contaminated with BaO or the like, the effect of suppressing the raster distortion does not decrease.

Next, a description will be given of a verification result of a discharge current suppressing effect by extending the creepage distance by making the surface shape of the relay member 13 uneven. Table 1 shows the results of measuring the average discharge current flowing from the getter spring 10 to the fifth electrode of the electron gun 51.

[0047]

[Table 1]

In Table 1, according to the first embodiment, as shown in FIG. 7, for example, the distance L ₀ between the ends of the first and second metal plates 11 and 12 in the getter spring 10 is 5 mm, for example. The uneven portion 13 on the surface of the relay member 13
It is a measurement result of the average discharge current in the case of forming the f and setting the creepage distance X to 6 mm and using a resistive ceramic having a volume resistance value of 10 ⁴ and 10 ^{6 for} the relay member 13. In the second embodiment, for example, as shown in FIG. 8, the distance L ₀ between the end portions of the first and second metal plates 11 and 12 in the getter spring 10 is, for example, 5 mm. A plurality of grooves 13g are formed to make the creepage distance X 10 mm, and the relay member 13 has a volume resistance value of about 1
0 is ⁴ and the measurement results of the average discharge current in the case of using the ^{106-resistant} ceramic. Comparative Example 1 is, for example,
As shown in FIG. 9, the first and second metal plates 11, 12
End distance L ₀ is, for example, a 5 mm, the surface of the relay member 201 is flat, i.e., the creeping distance X 5
mm, and the relay member 201 has a volume resistance of about 10
It is a measurement result of the average discharge current when using ⁴ and 10 ⁶ resistive ceramics. Comparative Example 2 includes, for example, as shown in FIG. 10, first and second metal plates 11 and 12.
End distance L ₀ of, for example, a 25 mm, surface flat of the relay member 202, i.e., the creeping distance X and 25 mm, and a volume resistance value resistor of about 10 ⁴ and 10 ⁶ to the relay member 202 5 shows a measurement result of an average discharge current when a conductive ceramic is used. Comparative Example 3 is a measurement result of an average discharge current when the shape of the relay member is the same as that of Comparative Example 1 and an insulating ceramic having a volume resistance value of 10 ¹⁷ is used for the relay member.

In Table 1, a comparison between Comparative Example 1 and Comparative Example 3 reveals that the relay member is made of resistive ceramic.
It can be seen that the discharge current increases. Comparing Example 1 and Example 2 with Comparative Example 1, it is understood that the discharge current is suppressed by increasing the creepage distance X of the relay member 13. Furthermore, in comparison between Example 1 and Example 2,
It can be seen that the longer the creepage distance X, the greater the effect of suppressing the discharge current. As can be seen from Comparative Example 3 and Example 2, extend the creeping distance X of the relay member 13 twice between the ends a distance L _0, and approximately 10 ⁴ volume resistivity in the relay member 13, 10
By using about ⁶ resistive ceramics, the same discharge current as that of the relay member using insulating ceramics can be obtained.

Further, as can be seen from Comparative Example 2, the discharge current can be suppressed by extending the length while keeping the surface shape of the relay member flat, but as in Example 2,
It can be seen that the longer the creepage distance X is formed by forming a plurality of grooves 13g in the relay member 13, the greater the effect of suppressing the discharge current. This is because the first metal plate 12
The current flowing toward the metal plate 11 is relatively easy to flow when the surface shape of the relay member is linear, and the current hardly flows when the surface of the relay member 13 is discontinuously formed by the plurality of grooves 13g. Because it becomes. For this reason, a greater effect of suppressing the discharge current can be obtained by making the surface of the relay member 13 discontinuous than by simply increasing the length of the relay member.

As described above, according to the above-described verification results, the screen of the cathode ray tube 2 caused by the charging of the relay member 13 is formed by using the resistive ceramic having the optimum resistance value for the relay member 13 of the getter sprig 10. Can be suppressed.
In addition, by providing irregularities on the surface of the relay member 13 to extend the creepage distance, the electron gun 51 can be moved from the getter sprig 10.
The discharge current to the fifth electrode G5 can be suppressed. In this case, rather than simply extending the creepage distance of the relay member 13, the discharge current can be more effectively suppressed by forming and extending irregularities and a plurality of grooves,
There is no need to extend the length of the relay member 13. For this reason, the material cost required for the relay member 13 can be reduced, and if the length of the relay member 13 is long, it becomes difficult to make the relay member 13 along the inner wall of the funnel glass 4, but such a problem occurs. Can be avoided. Furthermore, as a result of reducing the discharge current to the electron gun 51, it is possible to reduce the cost required for countermeasures against discharge of the drive circuit connected to the electron gun 51, for example, the addition of a spark gap or the like.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the constituent material of the relay member 13 is a resistive ceramic. However, for example, when the problem of image distortion of the cathode ray tube due to charging of the relay member 13 does not occur, the constituent material of the relay member 13 is used. May be an insulating ceramic. In this case, by forming the same irregularities and grooves on the surface of the insulating ceramic as in the above embodiment, the discharge current to the electron gun 51 can be reduced.

[0053]

According to the present invention, image distortion due to charging of the relay member of the getter supporting structure can be prevented to suppress the distortion of the screen of the cathode ray tube, and the discharge flowing to the electron gun through the getter supporting structure. It is possible to suppress the current.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a configuration of a display device to which the present invention is applied.

FIG. 2 is a diagram showing a configuration around a neck portion 4a of the cathode ray tube 2 shown in FIG.

FIG. 3 is a diagram illustrating a configuration of a getter spring.

FIG. 4 is an enlarged sectional view showing a periphery of a relay member 13;

FIG. 5 shows an image formed on the phosphor layer 5 of the cathode ray tube 2 when the electron beam B from the electron gun 51 of the cathode ray tube 2 is deflected and scanned within a circle formed by the inner wall of the funnel glass 4. FIG. 7 is a view showing a result before aging, in which is visually observed.

FIG. 6 shows an image formed on the phosphor layer 5 of the cathode ray tube 2 when the electron beam B from the electron gun 51 of the cathode ray tube 2 is deflected and scanned within a circle formed by the inner wall of the funnel glass 4. FIG. 9 is a view showing the result after aging by visually observing.

FIG. 7 is a view showing another structural example of the relay member according to the present invention.

FIG. 8 is a view showing still another structural example of the relay member according to the present invention.

FIG. 9 is a diagram illustrating an example of the structure of a relay member as a comparative example.

FIG. 10 is a diagram showing another example of the structure of the relay member as a comparative example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Cathode ray tube, 3 ... Panel glass, 4 ...
Funnel glass, 5 phosphor layer, 10 getter spring, 11 first metal plate, 12 second metal plate, 13
... Relay member, 13e ... Groove, 51 ... Electron gun, 31 ... Tuner circuit, 32 ... Video receiving circuit, 33 ... Video output circuit,
34: Synchronous deflection circuit, 35: Color signal circuit, 36: Medium / low voltage generation circuit, 37: High voltage generation circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiji Hagiwara Parkridge, New Jersey, USA Sony Drive (no address) Inside Sony Electronics Inc. (72) Inventor Michihisa Yano 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5C032 JJ11 JJ13

Claims (21)

[Claims] 1. A first metal member fixed to an electron gun, a second metal member holding a getter material, and a resistance connected to the first and second metal members. A cathode ray tube having a getter supporting structure provided with a relay member, wherein the relay member has a distance between the first and second metal members along a surface of the relay member between the first and second metal members. A cathode ray tube that is longer than a linear distance between the metal member and the metal member. 2. The cathode ray tube according to claim 1, wherein said relay member is made of a resistive ceramic. 3. The cathode ray tube according to claim 2, wherein the relay member has a volume resistance of about 10 ² Ω · cm to about 10 ¹² Ω · cm at 20 ° C. 4. The cathode ray tube according to claim 2, wherein said relay member has a volume resistance of about 10 ⁴ Ω · cm to about 10 ¹⁰ Ω · cm at 20 ° C. 5. The cathode ray tube according to claim 1, wherein an irregularity is provided on a surface of the relay member along a connection portion between the relay member and the first and second metal members. 6. The cathode ray tube according to claim 1, wherein a plurality of grooves are formed around the relay member along a connection portion between the first and second metal members. 7. The relay member is made of iron, manganese, alumina, forsterite, steatite or zirconia.
3. The cathode ray tube according to claim 2, wherein an oxide of neodymium or titanium is added. 8. The cathode ray tube according to claim 1, wherein said first and second metal members are formed of strip-shaped metal plates, and are respectively connected to said relay members by rivets. 9. The method according to claim 1, wherein the getter supporting structure is provided along an inner wall of a funnel glass, and the relay member is located near a deflection range of an electron beam emitted from the electron gun. Cathode ray tube. 10. A first metal member fixed to an electron gun, a second metal member holding a getter material, and
And a cathode ray tube having a getter support structure including a resistive relay member to which the second metal member is connected, and controlling emission, focusing, and acceleration of an electron beam by the electron gun based on a video signal. And a driving circuit for controlling electron beam deflection, wherein the distance between the first and second metal members along the surface of the relay member is the first distance. And a display device which is longer than a linear distance between the display device and the second metal member. 11. The display device according to claim 10, wherein said relay member is made of resistive ceramic. 12. The display device according to claim 10, wherein said relay member has a volume resistance of about 10 ² Ω · cm to about 10 ¹² Ω · cm at 20 ° C. 13. The display device according to claim 10, wherein said relay member has a volume resistance of about 10 ⁴ Ω · cm to about 10 ¹⁰ Ω · cm at 20 ° C. 14. The display device according to claim 10, wherein an irregularity is provided on a surface of the relay member along a portion between the connecting portions with the first and second metal members. 15. The display device according to claim 10, wherein a plurality of grooves are formed around the connection member along a portion between the connection portions with the first and second metal members. 16. The display device according to claim 11, wherein said relay member is made of alumina, forsterite, steatite or zirconia to which iron, manganese, neodymium or titanium oxide is added. 17. The apparatus according to claim 10, wherein the getter supporting structure is provided along an inner wall of a funnel glass, and the relay member is located near a deflection range of an electron beam emitted from the electron gun. Display device. 18. A first metal member fixed to an electron gun, a second metal member holding a getter material, and a first metal member.
A cathode ray tube having a getter supporting structure including an insulating relay member to which the first and second metal members are connected, wherein the relay member is a relay member between the first and second metal members. Wherein the distance along the surface of the cathode ray tube is longer than the linear distance between the first and second metal members. 19. The cathode ray tube according to claim 18, wherein said relay member is made of an insulating ceramic. 20. The cathode ray tube according to claim 18, wherein the surface of the relay member is provided with irregularities along a portion between the connection portions with the first and second metal members. 21. The cathode ray tube according to claim 18, wherein a plurality of grooves are formed around the relay member along a connection portion between the relay member and the first and second metal members.