JPH0746578B2 - Electronic beam generator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam generator, in particular, a cathode electrode formed of a linear electrode.

2. Description of the Related Art This type of electron beam generator is considered to be used as an electron source in a flat panel display device such as a television receiver or a terminal display of a computer, and is conventionally configured as shown in FIG. Has been done. The linear cathode electrode 1 is stretched between the supporting members 2 and 3 arranged at a predetermined interval by applying a predetermined tension, and the cathode electrode 1 is centered at predetermined intervals on both sides thereof. A back electrode 4 and a flat plate-shaped electron beam extraction electrode 5 having a large number of small holes formed therein.
And are provided. In the operation, thermoelectrons are emitted from the linear cathode electrode 1 heated to a high temperature, and a predetermined potential is applied to the electron beam extraction electrode 5, thereby generating an electron beam toward the front side F.

Problems to be Solved by the Invention In such a conventional configuration, when the distance S between the supporting members 2 and 3 is increased, the linear cathode electrode 1 fixes the supporting members 2 and 3 with only a small impact. The string vibrates as an end.
When the cathode electrode 1 vibrates in this manner, the emission current fluctuates, so that in the case of a display device of a television receiver, uneven brightness occurs and the image quality is degraded. Further, the vibrated cathode electrode 1 is replaced by the back electrode 4
If the cathode electrode 1 comes into contact with the electron beam extraction electrode 5 and is short-circuited, the cathode electrode 1 is disconnected.

Therefore, as shown in FIG. 12, projections 6 _{1 to} 6 _{3 made of} an insulating material are provided from the back electrode 4 side to the cathode electrode 1 side,
It is considered that the protrusions 6 _{1 to} 6 ₃ are brought into contact with the cathode electrode 1 to suppress the string vibration, but the heights of the protrusions 6 _{1 to} 6 _{3 from} the back electrode 4 are l ₁ , l ₂ , l ₃ uniformly aligned is no steward properly, since only a high two places ones of the projections ₆₁ through ₃ does not contact the cathode electrode 1, in reality is not sufficient function as a suppressing member vibration is there.

An object of the present invention is to provide an electron beam generator capable of sufficiently suppressing unnecessary vibration of the linear cathode electrode 1.

Means for Solving the Problems In the electron beam generator of the present invention, an electron beam extraction electrode is arranged in front of a linear cathode electrode, and a plurality of position regulating members abutting behind the cathode electrode are provided as cathodes. The position regulating members are provided at predetermined intervals in the longitudinal direction of the electrode, and the central portion of the cathode electrode is extruded and stretched so as to project toward the front side, and the electron beam extraction electrode is curved along the cathode electrode. It is characterized by that.

Operation According to this configuration, the cathode electrode is pushed and stretched by the position restricting member so that the central portion projects toward the front side, so that the cathode electrodes on both sides of the central portion of the cathode electrode are gradually retracted and positioned. The position regulating member is stretched in a state of being pressed against the regulating member, and the entire position regulating member contacts the cathode electrode.

Furthermore, since the electron beam extraction electrode is curved along the cathode electrode, the distance between the cathode electrode and the electron beam extraction electrode becomes uniform, and the electron beam extraction amount in the length direction of the cathode electrode becomes uniform.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

1 and 2 show an electron beam generator according to the present invention,
The components having the same functions as those in FIG. 11 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, 7 _{1 to} 7 ₇ are rod-shaped position regulating members whose tips are in contact with the back of the cathode electrode 1 and are made of quartz glass, and their base ends are held as shown in FIG. It has a cantilever structure that is connected at the portion 8. Position control member 7 _1
7-7 is the position regulating member 7 ₁ to 7 _3, 7 ₅ to 7 ₇ on both sides thereof in a central position regulating member 7 ₄ as in the first view is retracted gradually,
The cathode height regulating member 9 ₁ and 9 as the central portion of the cathode electrode 1 between ₂ position regulating member 7 _{1-7 7} is pushed to the front side F has been stretched. Further, the back electrode 4 and the electron beam extraction electrode 5 also follow the extrusion of the cathode electrode 1,
It protrudes to the front side F and is curved.

With this configuration, when the back electrode 4, the electron beam extraction electrode 5, and the holding portion 8 are attached at predetermined positions,
Each position regulating member 7 _{1-7 7} be between the cathode of the height control member 9 ₁ and 9 ₂ as shown in FIG. 1 and FIG. 2, the cathode electrode 1 of the position of the cathode height regulating member 9 ₁ position regulating Member 7 ₁ , 7 ₂ ,
The cathode electrode 1 at the position of the cathode height regulating member 9 ₂ is gradually pushed out to the front side F through 7 ₃ and 7 ₄ in order, and gradually through the position regulating members 7 ₇ , 7 ₆ , 7 ₅ and 7 _4. It is pushed to the front side F, the cathode electrodes 1 are stretched extruded to the front side F, each position regulating member 7 _{1-7 7} reliably contacts the cathode electrode 1.

Therefore, each of the position regulating members 7 _{1 to} 7 ₇ is connected to the cathode electrode 1.
The position where the cathode electrode 1 abuts becomes a node of the vibration of the cathode electrode 1, the natural frequency of the vibration rises and the amplitude becomes smaller, and the vibration of the cathode electrode 1 is less likely to occur compared to the conventional one, and the vibration is attenuated in a short time. However, the risk of disconnection of the cathode electrode 1 is greatly reduced, and the reliability is improved.

Further, since the distance between the electron beam extraction electrode 5 and the cathode electrode 1 is uniform in the length direction of the cathode electrode 1, the electron beam passage hole 10 of the electron beam extraction electrode 5 is formed.
The amount of the electron beam taken out from is uniform in the longitudinal direction of the cathode electrode 1.

3 to 9 are electron beam generators 11 in FIG.
An example in which is incorporated into a flat panel display device will be described. In FIGS. 3 and 4, an electron beam generator 11 is housed in the rear part of a casing 15 surrounded by a face plate 12, side walls 13 and a back plate 14, and a plurality of electron beam generators 11 are provided as ones corresponding to the cathode electrode 1. The cathode electrodes 1a to 1d are long in the vertical direction V of the face plate 12 and arranged in the horizontal direction H to be stretched. The position regulating member 7 _{1-7 7} and the holding portion 8 is constituted by a vibration insulating member 16. As shown in detail in FIG. 5, the vibration isolator 16 has first and first window portions 17a to 17d extending in the longitudinal direction of the cathode electrodes 1a to 1d formed in the arrangement direction of the cathode electrodes 1a to 1d. 2 fixed plate 18a, 18b superposed is configured, as the position regulating member 7 _{1-7 7} each window 17a~17d are formed, one end of FIG. 6 of the rod-shaped body 19 of quartz glass As described above, it is sandwiched between the first and second fixing plates 18a and 18b. An insulating spacer (not shown) is interposed between the vibration isolator 16 and the back electrode 4. The electron beam extraction electrode 5 has a large number of electron beam passage holes as shown in FIG.
Eighth between the take-out electrode plates 21a, 21b, 21c on which 20 is formed
As shown in the figure, the windows 22a, 22b, 22c, and 22d are overlapped with each other with an insulating spacer 23 interposed therebetween. In FIGS. 3 and 4, 24 _{1 to} 24 ₅ are horizontal deflection electrodes, 25 is a phosphor provided on the inner surface of the face plate 12, 26 is the face plate 12 and the horizontal deflection electrodes 24a to 24e. It is a support provided between them. 27a and 27b are cathode electrodes 1a to 1
A spring body that gives tension to d and is provided for each cathode electrode 1a to 1d. Reference numerals 28a to 28e are holding members having a curved surface 29 as shown in FIG. 9, and the curved surface 29 is located between the electron beam extraction electrode 5 and each horizontal deflection electrode 24a to 24e on the electron beam extraction electrode 5 side. It is installed. The anti-vibration body 16, the extraction electrodes 21a to 21c, and the insulating spacer 23 until the inside of the casing 15 is evacuated are shown in FIG. 5, FIG. 7, and FIG.
As can be seen from the figure, all of them are flat plates that are not curved, but when the inside of the casing 15 is evacuated by being interposed between the back electrode 4 and the holding members 28a to 28e, the back plate 14 is replaced by the casing 15 By bending the inside of the back electrode 4, a pressing force toward the face plate 12 acts on the back electrode 4 and the horizontal deflection electrode
Curved surface of each holding member 28a-28e supported by 24a-24e
It is pressed against 29 and elastically deforms along the curved surface 29, and as shown in FIG. 4, the back electrode 4, the electron beam extraction electrode 5,
Front F position regulating member 7 _{1-7 7} and the cathode electrode 1b is
Then, it is pushed out so as to protrude toward the central portion. The same applies to the cathode electrodes 1a, 1c, 1d.

In the flat-panel display device thus configured, when a predetermined potential is applied to each electrode and the cathode electrodes 1a to 1d are heated, thermoelectrons are emitted from the cathode electrodes 1a to 1d and pass through the electron beam extraction electrode 5. The electron beam is phosphor
It hits 25 and emits light. The vibration isolator 16 is a position regulating member 7 _{1 to} 7 ₇
Since the rod-shaped body 19 that is a cantilever structure is easily elastically deformed, even if there is an error in the mounting position when the rod-shaped body 19 is sandwiched between the first and second fixing plates 18a and 18b, it is possible to ensure Can be brought into contact with the cathode electrodes 1a to 1d. further,
With this cantilever structure, it is possible to prevent damage to the rod-shaped body 19 due to a difference in thermal expansion between the rod-shaped body 19 and the first and second fixing plates 18a and 18b when a thermal process during manufacturing is applied. . Rod-shaped body using quartz glass as a material with low thermal conductivity
For configuring the 19, the temperature of the cathode electrode 1a~1d heat of the cathode electrode 1a~1d is conducted to the side of the position regulating member 7 _{1-7 7} nor as significantly reduced.

In the above-described embodiment, the cathode electrodes 1a to 1d and the electron beam extraction electrode 5 are extruded to the front side F through the holding members 28a to 28e having the curved surface 29, which are the holding members 28a to 28e.
It can also be achieved by using a flat surface without the curved surface 29 and using each insulating spacer 23 in the electron beam extraction electrode 5 as shown in FIG.

FIG. 10 is a cross-sectional view of the insulating spacer 23 in the vertical direction V before being incorporated in the casing 15. The cathode electrode 1a is provided on both surfaces of the core material 30.
Insulating film 31 is applied so that both ends in the longitudinal direction of ~ 1d are thick and the central part is thin.By using this insulating spacer 23, the back plate 14 is bent when the casing 15 is evacuated. The cathode electrodes 1a to 1d and the extraction electrodes 21a to 21c adjacent to the insulating spacer 23 can be pushed out to the front side F.

Effects of the Invention As described above, according to the present invention, since the cathode electrode is extruded and stretched by the position regulating member so as to project toward the front side toward the center, all the position regulating members are surely brought into contact with the cathode electrode, and the respective contact members Since the contact position becomes a node of the vibration of the cathode electrode, the natural frequency of the vibration increases and the amplitude becomes smaller, the vibration of the cathode electrode is less likely to occur compared to the conventional one, and the vibration is attenuated in a short time. The risk of wire breakage is greatly reduced and reliability is improved.

Furthermore, since the electron beam extraction electrode is curved along the cathode electrode, the distance between the cathode electrode and the electron beam extraction electrode becomes uniform, and the electron beam extraction amount in the lengthwise direction of the cathode electrode becomes uniform. In combination with the reduction of electrode vibration, when used in a flat panel display device, the uneven brightness is reduced and the image quality is significantly improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the electron beam generator of the present invention, FIG. 2 is a view taken along the line XX 'in FIG. 1, and FIG. 3 is an electron beam generator in FIG. FIG. 4 is a horizontal cross-sectional view of a flat panel display device in which FIG.
FIG. 5 is a cross-sectional view taken along the line Y ′, FIG. 5 is an external perspective view of the vibration isolator in FIG. 3, FIG. 6 is a view taken along the line ZZ ′ in FIG. 5, and FIG. 7 is FIG. 8 is an external perspective view of the extraction electrode in FIG. 8, FIG. 8 is an external perspective view of the insulating spacer in FIG. 3, and FIG. 9 is an external perspective view of the holding member in FIG.
FIG. 10 is a sectional view of an insulating spacer in another embodiment, FIG.
FIG. 12 is a sectional view showing the basic structure of a conventional electron beam generator, and FIG. 12 is a sectional view of a conventional example in which a part of FIG. 11 is improved. 1, 1a to 1d ... Cathode electrode, 4 ... Back electrode, 5 ... Electron beam extraction electrode, 7 _{1 to} 7 ₇ ... Position regulating member, 8 ... Holding portion,
9 ₁ , 9 ₂ ... Cathode height regulating member, 10 ... Electron beam passage hole, 11 ... Electron beam generator, 12 ... Face plate,
14 ... Back plate, 15 ... Casing, 16 ... Anti-vibration body, 21a-21c ...
Extraction electrode, 23 ... Insulating spacer, 24a-24e ... Horizontal deflection plate, 28a-28e ... Holding member, 29 ... Curved surface.

Claims (4)

[Claims] 1. An electron beam extraction electrode is arranged in front of a linear cathode electrode, and a plurality of position regulating members which come into contact with the back of the cathode electrode are provided at predetermined intervals in the longitudinal direction of the cathode electrode. An electron beam generator in which a central portion of a cathode electrode is pushed out by a restricting member so as to project toward the front side, and the electron beam extraction electrode is curved along the cathode electrode. 2. A holding part for supporting a position regulating member and an electron beam extraction electrode are overlapped and pressed against a curved surface of the holding member so that the cathode electrode and the electron beam extraction electrode are projected forward. The electron beam generator according to claim 1. 3. The electron beam generator according to claim 1, wherein the position regulating member is formed of a quartz glass material having a small thermal conductivity. 4. The electron beam generator according to claim 1, wherein each position regulating member is supported by a cantilever structure.