JPH1167127A - Image display device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-life and high-vacuum image display device which can prevent a getter material from creeping around an image display part, can be evacuated to a high vacuum in a short time, and does not cause uneven pressure in the image display device. SOLUTION: A getter material scatter preventing structure 8 having a movable structure is disposed between an image display area, in which a phosphor plate 7 and a filament 12 are arranged, and a getter 5. The getter material scatter prevention structure 8 switches a opened state into a closed state of the image display area, and vice versa. For example, the vertical state of the image display device turns it into an open state (b) and the horizontal state of it turns it into a closed state (a). Thereby, the getter material can be prevented from scattering to the image display area at getter flashing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image display device such as a display device for displaying an image by irradiating a phosphor with an electron beam.

[0002]

2. Description of the Related Art Conventionally, image display devices include liquid crystal, EL, and the like.
(Electroluminescence), plasma, and electron beams. Generally, two types of electron-emitting devices using a thermal potential emitting device and a cold cathode electron-emitting device are known. The cold cathode electron emission device includes a field emission type (hereinafter, referred to as “FE type”) metal / insulating layer / metal type (hereinafter, referred to as “MIM type”), a surface conduction type electron emission device, and the like.

[0003] An example of the FE type is WP Dyke & WW
Dorn, “Field Emission”, Advance in Electron Phys
ics, 8, 89 (1956) or CA Spindt, “Physical
Properties of thin-film field emission cathodes w
ith molybdenium cones ”, J. Appl. Phys., 47, 5248
(1976) are known.

An example of the MIM type is CA Mead, “Oper
ation of Tunnel-Emission Devices ”, J. Appl. Phy
s., 32, 646 (1961) and the like are known.

Examples of the surface conduction electron-emitting device type include:
MI Elinson, Radio Eng. Electron Phys., 10, 1290
(1965).

[0006] In the surface conduction electron-emitting device, electron emission occurs when a current flows in a small-area thin film formed on a substrate in parallel with the film surface. Examples of the surface conduction electron-emitting device include a device using an SnO ₂ thin film by Elinson et al. And a device using an Au thin film [G. Dittmer: Thin Solis F.
ilms, 9, 317 (1972)], based on In ₂ O ₃ / SnO ₂ thin film [M. Hartwell and CG Fonstad: IEEE Trans. E
D Conf., 519 (1975)], using a carbon thin film [Hisashi Araki et al .: Vacuum, Vol. 26, No. 1, page 22, (198)
3)] has been reported.

As a typical example of these surface conduction electron-emitting devices, the above-mentioned M.P. FIG. 3 schematically shows a device configuration of the Hartwell. In the figure, 31 is a substrate. Numeral 34 denotes a conductive thin film, which is formed of a metal oxide thin film or the like formed by sputtering in an H-shaped pattern, and the electron emitting portion 35 is formed by an energization process called energization forming described later. In addition, the element electrode interval L in the figure is 0.5 to 1 mm,
W 'is set to 0.1 mm.

Conventionally, in these surface conduction electron-emitting devices, before the electron emission, the conductive thin film 34 is generally formed with an electron-emitting portion 35 by an energization process called energization forming. That is, the energization forming means applying a DC voltage or a very slow rising voltage through the 32 and 33 at both ends of the conductive thin film 34 and energizing the same to locally destroy, deform or alter the conductive thin film, thereby increasing the electrical high voltage. Electron emission unit 3 in a resistance state
5 is formed. In the electron emitting portion 35, a crack is generated in a part of the conductive thin film 34, and electrons are emitted from the vicinity of the crack.
In the surface conduction type electron-emitting device subjected to the energization forming process, a voltage is applied through 32 and 33 of the conductive thin film 34 and a current is caused to flow through the device, thereby causing the electron-emitting portion 35 to emit electrons. is there.

In an image display device that excites a phosphor using an electron beam emitted from such an electron-emitting device, it is generally important to increase the degree of vacuum in the image display device.

In general, a getter is used to maintain the inside of a sealed airtight container at a high vacuum. The getter is in a partially open container, for example, as an evaporable getter.
A getter material such as Ba, Sr, or Mg is stored, and the getter material is heated by induction heating, electric heating, or the like, and is evaporated (hereinafter, referred to as “evaporation”).
By causing the getter material to adhere to the airtight container by flashing), residual gas and the like in the apparatus are adsorbed by the attached getter material, and the degree of vacuum in the apparatus is maintained.

FIG. 4 shows an example of a conventional image display device.
In FIG. 4, reference numerals 20 and 21 denote substrates made of an insulating material such as glass, on which a phosphor 36 is formed. Hereinafter, the substrate 20 is referred to as a rear plate, and the substrate 21 is referred to as a face plate. Rear plate 20 and face plate 21
Is sealed with an outer frame 25 made of an insulating material such as glass and a low-melting glass or the like, and forms an airtight container by sealing the exhaust pipe 40. The atmospheric pressure applied to the container is
5 supported. A getter 50 is held in the container by a jig 52 held by the getter in the container (hereinafter referred to as a getter holding jig 52). Getter 50
A getter material scattering prevention structure 70 is provided between the fluorescent material 36 and the image display portion having the filament 37 in order to prevent the getter material from entering the image display portion. Exhaust pipe 4
After evacuating the container by zero, the exhaust pipe is sealed. Thereafter, the getter 50 is flashed to complete the image display device. Reference numeral 37 denotes a filament which is an electron beam generating source. Thermions generated by heating the filament 37 are accelerated by the control grid 38 and collide with the phosphor to display an image.

[0012]

However, the image display device having the above configuration has the following problems.

In the structure for preventing the scattering of the getter material, when the getter material is flashed, the getter adheres to an electron beam generating source disposed in the apparatus, wiring for driving the electron beam generating source, a fluorescent material, etc. Although it is provided in order not to cause a decrease in line generation performance, a decrease in luminance, etc., in order to prevent the getter material from sneaking into the image display portion, the getter material scattering prevention structure is made as large as possible, and the shielding effect is increased. There is a need to.

On the other hand, in order to efficiently exhaust the inside of the image display device by the getter flash surface after the getter flash, it is necessary to increase the conductance (easy flow of gas molecules) in the getter material scattering prevention structure. If the conductance is low, a pressure distribution occurs in the image display device,
This is because the life of the image display device is shortened.

However, if the wall for preventing the scattering of the getter material is enlarged in order to prevent the getter material from sneaking into the image display portion, the conductance is reduced and the exhaust capability is reduced, which has been a problem.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the purpose of the present invention. Provided is a long-life, high-vacuum image display device in which a getter material can be evacuated to a high vacuum in a short time without sneaking into an image display unit, and which does not cause pressure unevenness inside the image display device.

That is, according to the present invention, there is provided an airtight container including a face plate and a rear plate disposed opposite to the face plate, means for generating an electron beam in the airtight container, A phosphor for displaying an image by irradiation, an evaporable getter, and a getter material scattering prevention structure for preventing the getter material evaporated from the getter from scattering to an area where the phosphor and the electron beam generating means are arranged. In the image display device, the getter material scattering preventing structure is a movable structure, and is disposed between the region where the phosphor and the electron beam generating means are disposed and the getter, and the opening of the airtight container is provided. An image display device is provided, wherein switching between a state and a closed state is performed by the getter material scattering prevention structure.

In the image display apparatus according to the present invention, the getter material scattering preventing structure may be structured so as to be rotated by its own weight about a rotation axis. In this case, it is preferable that the center of gravity of the structure for preventing scattering of the getter material and the center of gravity of the rotating shaft be different from each other.

In the image display device according to the present invention, the means for generating the electron beam may be a surface conduction electron-emitting device.

Further, in the image display device of the present invention, the getter material scattering prevention structure includes a magnetic material, and the switching between the open state and the closed state of the getter scattering prevention structure is performed by applying and releasing an external magnetic field. It can also be.

Further, in the image display device of the present invention, the getter material scattering prevention structure includes an elastic body, the getter material scattering prevention structure is held in an open state by a restoring force of the elastic body, and the getter material scattering prevention structure is applied by an external magnetic field. A structure in which the getter material scattering prevention structure is in a closed state may be adopted.

Further, according to the present invention, a first step of forming an airtight container including a face plate having a phosphor serving as a display surface and a rear plate disposed opposite to the face plate, A second step of exhausting the inside of the container, and a third step of heating and evaporating the getter to make the inside of the hermetic container a high vacuum state, wherein the second step includes: The method for manufacturing an image display device is provided, wherein the getter material scattering prevention structure is opened, and the getter material scattering prevention structure is closed in the third step.

In the method for manufacturing an image display device according to the present invention, the getter material scattering preventing structure is configured to be rotated by its own weight about a rotation axis, and in the second step, the closed container is set in an upright state. The getter material scattering prevention structure can be in an open state, and in the third step, the closed container is in a horizontal state, so that the getter material scattering prevention structure can be in a closed state.

In the method for manufacturing an image display device according to the present invention, the getter material scattering prevention structure is a structure including a magnetic material, and in the second step, the getter material scattering prevention structure is applied by applying an external magnetic field. In the third step, the getter material scattering prevention structure can be closed by releasing the external magnetic field in the third step.

In the method for manufacturing an image display device according to the present invention, the getter material scattering prevention structure is a structure including a magnetic material, and in the second step, the getter material scattering prevention structure is released by releasing an external magnetic field. In the third step, the getter material scattering prevention structure may be opened by applying an external magnetic field in the third step.

According to the image display device of the present invention, since the movable getter material scattering prevention structure is installed in the airtight container and between the image display unit and the getter, the getter material scattering prevention is performed when the getter flush is performed. By turning the structure to the closed position and performing the getter flash, scattering of the getter material to the image display unit can be prevented. Furthermore, after flashing the getter material, the exhaust from the image display unit is turned by turning the getter material scattering prevention structure to the position of the open state,
It can be performed with high conductance. Thereby, when the getter material is flashed, the getter material does not move around to the image display unit, and when the image display device after the getter material is flashed is set to a high vacuum, there is no pressure unevenness in the image display device. A high vacuum, long life image display device can be obtained.

[0027]

FIG. 1 shows an example of an image display device according to the present invention. 1A and 1B are main cross-sectional views showing an example of the image display device of the present invention. In FIG. 1, 1
Is a substrate (rear plate) made of an insulator, and 2 is a substrate (face plate) made of an insulator, on which a phosphor 7 is formed. 3 is an outer frame made of an insulating material, 4 is an exhaust pipe, and the rear plate 1 and the face plate 2 are
Are sealed with the outer frame 3 with a low melting point glass or the like at an interval of. The container is evacuated by a vacuum pump through an exhaust pipe 4 and then sealed to form an airtight container. Reference numeral 5 denotes an evaporable getter for evacuating and maintaining the container at a high vacuum, and reference numeral 6 denotes a jig provided to prevent the frame from being damaged by heat generated when the getter 5 is flushed. A getter material scattering prevention structure 8 is arranged between the getter 5 and an image display area composed of the phosphor 7 and the filament 12.
The getter material scattering prevention structure 8 includes a rotating body 9, a shaft 10, and a shaft support (not shown). The shaft support 11 is bonded to the rear plate 1, the face plate 2, or both plates. I have. The rotator 9 rotates by its own weight, and can open or close the getter and the image display unit, or can be movable. This is provided so that the getter material is not scattered on the image display unit when the getter material is flashed. As a turning method, the image display device can be turned by its own weight by making it vertical or horizontal. Although the thickness of the rotator depends on the thickness of the image display device, it is preferable that the rotator be as thin as possible in order to increase the conductance at the time of evacuation, but it is preferably about 0.1 to 1 mm in terms of structure. Reference numeral 12 denotes a filament as an electron beam generating means, and reference numeral 13 denotes a control grid for controlling electrons generated from the filament 12.

The production of the image display device is performed as follows. A low-melting glass is applied in advance on the face plate 2 and the rear plate 1, the outer frame 3, the shaft support 11 of the getter material scattering prevention structure 8, and the exhaust pipe 4.
The shaft support 11, the outer frame 3, the exhaust pipe 4, the filament 12, and the control grid 13 of the getter material scattering prevention structure 8 are arranged between the face plate 2 and the rear plate 1 by a positioning jig at the positions, and a low melting glass is provided. Is fired to fix the member. After the fixation, the inside of the airtight container is evacuated using a vacuum pump by the exhaust pipe 4, and when the pressure reaches about 1 × 10 ⁻⁶ Torr, the exhaust pipe 4 is sealed. Getter 5
Performs baking while the airtight container is evacuated by the exhaust pipe 4,
Degas. After sealing the exhaust pipe 4, the airtight container is kept horizontal to the ground as shown in FIG. 2 (a) so that the rotating body 9 of the getter material scattering prevention structure 8 is parallel to the thickness direction of the airtight container. Then, the getter 5 is energized through the getter holding rod 6 to flash the getter material, and the getter material is attached to the surface of the face plate, the rear plate, the outer frame, the rotating body, and the like.

At this time, the getter 5 and the image display area are closed by the rotating body 9 of the getter material scattering preventing structure 8, so that the getter material does not go around the image display section. Next, after the getter flush, the airtight container is kept perpendicular to the ground as shown in FIG. 1B, so that the getter 5 and the image display area are rotated by the rotating body 9 of the getter material scattering prevention structure 8 by its own weight, and the opening is opened. Because of the state, the image display area is evacuated by the attached getter material, and the degree of vacuum is maintained.
Therefore, the rotating body can be smoothly rotated by its own weight by not making the rotation axis of the rotating body 9 coincide with the center of gravity of the rotating body. Thus, an image display device can be manufactured.

The image display device of the present invention is not particularly limited as long as the interval between the face plate and the rear plate is necessary to excite the phosphor with an electron beam and display an image.

In the image display device of the present invention, the getter to be used may be of an evaporating type, and its main components are, for example, Ba (barium), Ca (calcium), Sr (strontium), Ti (titanium). , Zr
(Zirconium), Nb (niobium), Cr (chromium),
Examples include, but are not limited to, Fe (iron) and Ni (nickel). Also, the method of flashing the getter includes methods such as energization heating and induction heating, but is not particularly limited.

The getter material scattering prevention structure of the present invention has a movable structure. The movable structure refers to a structure that is in an open state in a step of exhausting the inside of the hermetic container, and is in a closed state in a step of making the inside of the hermetic container a high vacuum state by heating and evaporating the getter. . Here, the open state means that the airtight container is in an open state with respect to the exhaust port, and refers to a state as shown in FIG. Further, the closed state means that the airtight container is in a closed state with respect to the exhaust port, and refers to a state as shown in FIG.

The getter material scattering prevention structure of the present invention may be any type as long as it is a movable type, and is preferably a structure that turns around its own axis by its own weight. However, it is possible to switch between an open state and a closed state. There is no particular limitation as long as it has a structure such as a slide. Further, the position of the exhaust pipe is not limited to the arrangement shown in FIG. 1 and may be arranged on the face plate side or the rear plate side.

In the image display device of the present invention, the fixing device is fixed with the low-melting glass such as the getter holding jig, the getter material scattering prevention wall, the outer frame, the face plate and the rear plate. There is no particular limitation as long as it is a sealing material and a fixing material that can keep the image display device airtight, but a material that does not emit a gas that degrades the degree of vacuum and quality of the airtight container is preferable.

In the image display device of the present invention, the means for generating electrons include a thermionic source generated by heating the filament as described above, a cold cathode electron such as the surface conduction electron-emitting device and a field emission device. Any of them can be used.

The rotator according to the present invention may be configured as shown in FIGS. In FIG. 6, the rotating body 9
The lower end is connected to the rear plate 1 by a rotating shaft 10 and is rotatable by an external force. Further, an elastic body 41 is provided between the rotating body 9 and the rear plate 1. Reference numeral 41 denotes a configuration in which a force is applied in a direction of pushing down the rotating body 9 onto the rear plate 1. The rotating body 9 is entirely made of a magnetic body, or a magnetic body 40 is provided in a part thereof. The elastic body 41 can be compressed and raised by applying a strong magnetic field from outside. . With such a configuration, the external magnetic field 42 is applied at the time of getter flash, and the rotating body 9 is erected to be in the closed state, thereby preventing the getter material from contaminating the image display unit. After the getter flash, the external magnetic field 42
Is removed, the elastic body 41 is rested on the rear plate 1 by the restoring force, and high exhaust conductance can be realized.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing a part of an image display device used in one embodiment of the present invention,
FIG. 1B is a cross-sectional view of a part of the image display device according to the present embodiment during driving. In FIG. 1, 1 is a rear plate, 2 is a face plate, and 3 is an outer frame. For these, blue plate glass was used. The face plate 2 and the rear plate 1 are sealed with a low-melting glass (LS3081 manufactured by Nippon Electric Glass Co., Ltd.) via an outer frame. Sealing was performed at 410 ° C. using an electric furnace. A W-line filament 12 as an electron source, a control grid 13 for controlling the electron beam, a phosphor 7 formed on an anode (not shown), a rotating body 9 having a getter material scattering prevention structure, and a rotating shaft 10 are provided in the container.
Are arranged by a shaft support (not shown). Reference numeral 5 denotes a getter for evacuating and maintaining the image display device in a high vacuum. Reference numeral 6 denotes a getter holding rod, which is provided to prevent damage to the outer frame due to heat at the time of getter flash and to supply current to the getter. , Penetrating the outer frame and being taken out. The face plate 2 and the rear plate 1 have an outer frame thickness of 10 mm
Held at intervals. The thickness of the rotating body 9 of the getter material scattering preventing structure was 1 mm, the length was 11 mm, and the rotating shaft 10 was set at a height of 8 mm from the rear plate side. The hermetically sealed container produced by sealing is evacuated by a vacuum pump through an exhaust pipe 4 and subsequently heated and degassed by a hot plate. When the degree of vacuum becomes 1 × 10 ⁻⁶ Torr or less, the exhaust pipe is evacuated with a gas burner. It was sealed by heating (closed cutting).

Subsequently, the airtight container is laid down as shown in FIG. 1A, and the rotating body 9 having the getter material scattering prevention structure is positioned between the getter and the region where the fluorescent material and the filament as the electron beam generating means are arranged. When was closed, the getter 5 was energized to flush the getter material.

Next, the image display device thus formed is erected as shown in FIG. 1B, and an open state is formed between the getter and the region where the fluorescent material and the filament as the electron beam generating means are arranged. By doing so, the degree of vacuum is maintained by the exhaust by the getter material.

In the image display device obtained by the configuration of the above embodiment, the pressure difference between the getter flash surface and the area where the fluorescent material and the filament as the electron beam generating means are arranged was small and good. In addition, the degree of vacuum in the image display device was kept high and the life was improved. In addition, it was confirmed that the getter material did not enter the region where the fluorescent material and the filament as the electron beam generating means were arranged, and that a favorable display could be performed.

(Embodiment 2) In this embodiment, a device using, for example, a surface conduction electron-emitting device as an electron beam generating source will be described with reference to FIG. FIG. 2A is a schematic plan view showing a main part of an image display device using a surface conduction electron-emitting device, and FIG. It is B schematic sectional drawing.

In FIG. 2, reference numeral 1 denotes a substrate made of an insulating material such as glass, and the substrate 1 is hereinafter referred to as a rear plate. The surface conduction electron-emitting devices are arranged in a matrix on the rear plate 1 to form an electron beam generator 15.

Reference numeral 2 denotes a substrate made of the same insulating material as that of the rear plate 1. A phosphor 17 and a metal back 16 made of aluminum are formed in this order from the substrate side. Hereinafter, the substrate 2 is referred to as a face plate. The rear plate 1 and the face plate 2 are sealed with an outer frame 3 made of an insulating material such as glass and a low-melting glass (LS3081 manufactured by NEC Corporation), and form a vacuum container with a space of 4 mm. I have. Reference numeral 8 denotes a getter scattering prevention structure, which includes a rotating body 9 and a rotating shaft 1.
0, a shaft support 11 and a rear plate 1
And the face plate 2. The thickness of the rotating body 9 was 1 mm, and the length was 5 mm. Other members were assembled in the same manner as in Example 1. The getter is a nitrogen-doped Ba-Al-Ni getter, which is baked by external heating. Thereafter, the rotator 9 closes the space between the getter and the region where the phosphor and the electron beam generating means are disposed, and then externally heats the getter 5 by applying current.
Heated to 00 ° C. and flashed. Further, the container was erected, and the rotating body 9 opened the space between the getter and the region where the phosphor and the electron beam generating means were arranged, thereby completing the image display device.

In the image display device configured as described above, electrons emitted from the surface conduction electron-emitting device are applied to a voltage (1 to 1) applied to a metal back made of aluminum applied to the face plate 2. 10 kV), and is collided with the face plate to display an image.

It was found that the image display device obtained by the configuration of the above embodiment can obtain the same effect as that of the first embodiment. Furthermore, there is no getter wrap around the electron beam generator,
No luminance unevenness occurred.

(Embodiment 3) A third embodiment of the present invention employing a getter material scattering prevention structure provided with a magnetic material will be described with reference to FIGS. 5, 6A and 6B. FIG. 6 is a sectional view in FIG. 5A-B. 5 and 6, the configuration other than the getter material scattering prevention structure is the same as that of the second embodiment.

In this embodiment, the structure for preventing the getter material from scattering includes a rotating shaft 9 in contact with the rotating body 9 and the rear plate, a magnetic body 40 attached to both ends of the rotating body 9, and a spring having one of the springs fixed to the rear plate 1. 41.

In this embodiment, a Ni thin plate having a thickness of 0.2 mm and a width of 10 mm was used as the magnetic body 40 by attaching it to one side of the rotating body 9.

As the magnetic material 40, a metal such as Fe or Co, an alloy containing a rare earth element, or the like may be used.
Further, a magnetic thin film formed on one or both sides of the rotating body 9 by vacuum deposition, sputtering, plating, or the like may be used.

Further, the rotating body 9 itself can be made of a magnetic material.

With such a configuration, the strength of the spring is adjusted so that the rotating body 9 falls down on the rear plate 1 by the restoring force of the spring 41 in the normal state. By applying a sufficient magnetic field 42 from the outside, the couple acting on the magnetic body 40 exceeds the restoring force of the spring 41, and the rotating body 9 stands up and can separate the space where the getter material scatters from the space where the image display element is located. Becomes After this state, the getter 5 is energized to flash the getter material to form a getter flash surface 43.

As the external magnetic field 42, an Sm-Co type or Nd
Although a strong permanent magnet based on -Fe was used, an electromagnet may be used.

After the end of the getter flash, the external magnetic field 42 is removed, and the rotating body 9 falls over the rear plate 1 again by the restoring force of the spring 41, so that the exhaust conductance can be increased.

By using such a mechanism, it is possible to maintain a higher degree of vacuum inside the display even when the display is used near a horizontal state in addition to the first and second embodiments.

[0055]

As described above, in the image display apparatus, by disposing the movable getter material scattering preventing structure between the area where the fluorescent material and the filament as the electron beam generating means are arranged and the getter, During getter flash, the getter material does not wrap around the phosphor or electron beam generating means, and the conductance between the area where the phosphor and the filament as the electron beam generating means are arranged and the getter material can be high, so that image display is performed. A long-life image display device without unevenness or reduction in the degree of vacuum in the device can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are schematic sectional views showing an embodiment of the image display device of the present invention.

FIGS. 2A and 2B are diagrams showing an image display device according to an embodiment of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along a line AB in FIG.

FIG. 3 is a plan view of the surface conduction electron-emitting device.

FIG. 4 is a cross-sectional view illustrating an example of a conventional image display device.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear plate 2 Face plate 3 Outer frame 4 Exhaust pipe 5 Getter 6 Getter holding bar 7 Phosphor 8 Getter material scattering prevention structure 9 Rotating body 10 Rotating shaft 11 Shaft support 12 Filament 13 Control grid 15 Electron beam generator 16 Metal back 17 Phosphor 31 Substrate 32 Conductive thin film end 33 Conductive thin film end 34 Conductive thin film 35 Electron beam emitting part 36 Phosphor 37 Filament 38 Control grid 40 Magnetic body 41 Spring 42 External magnetic field 43 Getter surface 50 Getter 52 Jig 70 Getter material scattering prevention structure

Claims (10)

[Claims] 1. An airtight container including a face plate and a rear plate disposed opposite to the face plate, means for generating an electron beam in the airtight container, and displaying an image by irradiating the electron beam. Image obtained by arranging a phosphor to be emitted, an evaporable getter, and a getter material scattering prevention structure for preventing the getter material evaporated from the getter from scattering to a region where the phosphor and the electron beam generating means are arranged. In the display device, the getter material scattering prevention structure is a movable structure, and is disposed between the region where the phosphor and the electron beam generating means are disposed and the getter, and the open state and the closed state of the hermetic container. The image display device is characterized in that the switching of the image is performed by the getter material scattering prevention structure. 2. The image display device according to claim 1, wherein the getter material scattering prevention structure is rotated by its own weight about a rotation axis. 3. The image display device according to claim 2, wherein a center of gravity of the getter material scattering prevention structure and a center of gravity of the rotating shaft are located at different positions. 4. The image display device according to claim 1, wherein said means for generating an electron beam is a surface conduction electron-emitting device. 5. The getter material scattering prevention structure includes a magnetic material, and switching between the open state and the closed state of the getter scattering prevention structure is performed by applying and releasing an external magnetic field. The image display device as described in the above. 6. The getter material scattering prevention structure includes an elastic body, the getter material scattering prevention structure is kept open by the restoring force of the elastic body, and the getter material scattering prevention structure is closed by application of an external magnetic field. The image display device according to claim 1, wherein the image display device is in a state. 7. A first step of forming an airtight container including a face plate having a phosphor serving as a display surface and a rear plate disposed opposite to the face plate, and a step of evacuating the airtight container. In a method for manufacturing an image display device, the method further comprises: a second step; and a third step of heating and evaporating the getter to make the inside of the hermetic container a high vacuum state. Wherein the getter material scattering preventing structure is closed in the third step. 8. The getter material scattering prevention structure is configured to rotate around its own axis by its own weight around the rotation axis, and the getter material scattering prevention structure is opened by setting the closed container upright in the second step. The method according to claim 7, wherein in the third step, the getter material scattering prevention structure is closed by setting the closed container in a horizontal state. 9. The getter material scattering prevention structure has a structure including a magnetic material, and in the second step, the getter material scattering prevention structure is opened by applying an external magnetic field. 8. The method according to claim 7, wherein the getter material scattering prevention structure is closed by releasing the magnetic field. 10. The getter material scattering prevention structure is a structure including a magnetic material, and in the second step, the getter material scattering prevention structure is closed by releasing an external magnetic field;
8. The method according to claim 7, wherein in the third step, the getter material scattering prevention structure is opened by applying an external magnetic field.