JP2943158B2 - Image display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image display device in an image device.

2. Description of the Related Art In an image display device using a linear cathode, an electron beam generated from the linear cathode irradiates a phosphor through a control electrode to emit light, thereby displaying an image.

Here, the linear cathode is stretched in order to generate an electron flow uniformly distributed in the horizontal direction. For this reason, when an external force is applied to the image display device using the linear cathode, the linear cathode
As shown in the figure, a vibration mainly including a simple vibration is started, and continues to oscillate until the damping is completed. When the line cathode vibrates, the amount of the electron beam periodically changes, and as a result, the brightness on the screen periodically changes, and a stable high-quality image cannot be obtained.

Conventionally, as a measure for preventing the vibration of the linear cathode, Japanese Patent Laid-Open Publication No.
There is a cathode control line system as disclosed in Japanese Patent No. 10958. This will be described below with reference to the drawings.

As shown in FIGS. 7 and 8, the cathode control line 18 is
Is stretched in a direction perpendicular to the direction in which the wire cathode 13 is stretched, and is kept at a constant distance from the linear cathode 13. Then, when an external force is applied to this structure, the line cathode 13 starts to vibrate mainly with a single vibration, but when it comes into contact with the cathode control line 18, the vibration is controlled and attenuated to suppress the vibration. Also, the cathode control line
Numerals 18 are provided at predetermined intervals (not at equal intervals), so that resonance caused by secondary vibration of the linear cathode 13 which serves as a node of the cathode control line 18 can be prevented. (See FIG. 9).

Problems to be Solved by the Invention In the above configuration, there are the following problems in order to always obtain a high-quality image.

In an image display device for a display, when a cathode control line is provided in an effective screen, an electric field is disturbed and a uniform electron flow cannot be generated, so that a uniform image cannot be obtained.

Further, when a plurality of line cathodes are used, it is very difficult to make the distance between the cathode control lines and the line cathodes uniform in all the line cathodes. Then, the effect of preventing the vibration of the line cathode varies, and a change in luminance appears on the screen, so that a uniform and high-quality image cannot be obtained.

The present invention has been made in view of the above circumstances, and provides an image display device capable of stably displaying a high-quality image at all times.

Means for Solving the Problems In order to solve the above problems, a first invention of the present invention is:
At one end or both ends of one or more linear cathodes, one or several inorganic substances having holes are penetrated.
It is possible to suppress the vibration of the linear cathode by installing and freely moving the inorganic material having the holes.

A second invention of the present invention is characterized in that a shape memory alloy in which the shape of a coil is stored in advance is penetrated and installed at one end or both ends of one or a plurality of linear cathodes, By freely moving the memory alloy, the vibration of the linear cathode can be suppressed.

According to a third aspect of the present invention, a shape memory alloy in which a shape of a coil having a part in the circumferential direction is stored in advance at one end or both ends of one or a plurality of linear cathodes is provided. The configuration is characterized in that the shape memory alloy is allowed to freely move, thereby suppressing the vibration of the linear cathode.

According to a fourth aspect of the present invention, a shape memory alloy in which the shape of a coil is stored in advance is reversed and then penetrated and installed at one end or both ends of one or more wire cathodes. A feature is that vibration of the linear cathode can be suppressed by freely moving the shape memory alloy.

According to a fifth aspect of the present invention, the shape of a coil in which a part in the circumferential direction is previously intimately stored at one end or both ends of one or a plurality of linear cathodes is reduced by 1 to 2 turns.
The present invention is characterized in that one or several wound shape memory alloys are penetrated and set, and the shape memory alloy is allowed to freely move to suppress the vibration of the linear cathode.

The sixth invention of the present invention provides a shape memory alloy in which the shape of the coil is stored in advance and the number of turns is set to 1 to 2 at one end or both ends of one or a plurality of linear cathodes,
It is characterized in that one or several pieces are penetrated and installed after being reversed, and the vibration of the linear cathode can be suppressed by free movement of the shape memory alloy.

According to a seventh aspect of the present invention, there is provided a shape memory alloy in which the shape of a ring which has been previously adhered to both ends is stored at one end or both ends of one or a plurality of linear cathodes.
One or several pieces are penetrated and installed, and the shape memory alloy is allowed to freely move to suppress the vibration of the linear cathode.

An eighth invention of the present invention is characterized in that a coil of a spring material having a part in the circumferential direction closely attached to one end or both ends of one or a plurality of linear cathodes is penetrated and installed, By freely moving the shape memory alloy, vibration of the linear cathode can be suppressed.

A ninth invention of the present invention is characterized in that one or several rings of a spring material whose both end surfaces are in close contact are penetrated and installed at one or both ends of one or more linear cathodes. The vibration of the linear cathode can be suppressed by free movement of the shape memory alloy.

According to a tenth aspect of the present invention, one or more insulating inorganic substances having holes are provided at one end or both ends of one or a plurality of linear cathodes, and the insulating cathode having the holes is provided. By freely moving the inorganic material, the vibration of the linear cathode can be suppressed.

An eleventh invention of the present invention is that one or several inorganic materials of the same material as the wire cathode having a hole are penetrated and installed at one end or both ends of one or more wire cathodes, By virtue of free movement of the same inorganic material as the line cathode having holes, vibration of the line cathode can be suppressed.

Operation The operation of the first invention of the present invention is as described above, by penetrating and installing an inorganic substance having a hole at one end or both ends of the line cathode, the vibration of the line cathode due to an external force applied to the image display device is reduced. When this occurs, the inorganic substance having the holes immediately causes free movement and absorbs vibration energy, thereby suppressing the vibration of the linear cathode. In addition, since the inorganic substance having the holes is placed on the effective screen and is securely in contact with the linear cathode by weight, there is no variation in the vibration preventing effect, no change in luminance occurs on the screen, and stable. It provides high quality images.

A feature of the operation of the second invention of the present invention resides in that the inorganic substance having the holes is a shape memory alloy in which the shape of the coil is stored in advance, and can be penetrated and installed after the wire cathode is stretched. Pulling the shape memory alloy in the axial direction of the coil, widening the gap between the wires, fitting the gap to all the gaps with the wire cathode, placing the shape memory alloy on the wire cathode, and then setting the shape memory When the alloy is heated, the gap between the return lines is reduced to the conventional memory shape, so that the shape memory alloy can be prevented from coming off from the wire cathode. The operation of the first embodiment of the present invention is the same as that of the first embodiment.

The feature of the operation of the third invention of the present invention is that, since the shape of the shape memory alloy is a coil in which a part in the circumferential direction is in close contact, the space between the lines of the shape memory alloy is widened and the shape memory alloy is installed on the line cathode. Thereafter, when the shape memory alloy is heated, the shape memory alloy returns to the conventional memory shape, and a part in the circumferential direction of the coil is securely adhered to eliminate the gap, so that the shape memory alloy is completely prevented from coming off from the linear cathode. You can do it. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

The feature of the operation of the fourth invention of the present invention is that, after reversing the shape memory alloy in which the shape of the coil is stored, the line between the shape memory alloys is expanded and the coil is installed on the line cathode. When the shape memory alloy is heated, the gap in the circumferential direction of the coil is forcibly eliminated during the return of the conventional memory shape, so that the shape memory alloy can be completely prevented from coming off from the linear cathode. is there. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

The feature of the operation of the fifth invention of the present invention is that the memory shape of the shape memory alloy is a coil in which a part of the shape in the circumferential direction is in close contact and the number of turns is 1 to 2, so that the distance between the lines of the shape memory alloy is reduced. When installed on the linear cathode, the shape memory alloy can be inserted and installed from one direction without twisting. Thereafter, when the shape memory alloy is heated, the shape memory alloy returns to the conventional memory shape, and a part in the circumferential direction of the coil is securely adhered to eliminate the gap, so that the shape memory alloy is completely prevented from coming off from the linear cathode. You can do it. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

The feature of the operation of the sixth invention of the present invention is that after the shape memory alloy having the number of turns of 1 to 2 is stored and the shape memory alloy is reversed, the space between the shape memory alloys is widened and the coil is installed on the wire cathode. In doing so, the shape memory alloy can be inserted and installed from one direction without twisting, and when the shape memory alloy is subsequently heated, the coil circle is forcibly entrained while returning to the conventional memory shape. Since the circumferential gap is eliminated, the shape memory alloy can be completely prevented from coming off from the wire cathode. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

A feature of the operation of the seventh invention of the present invention is that the inorganic substance having the hole is a shape memory alloy in which the shape of a ring in which both end surfaces are in close contact is stored in advance, and can be penetrated and installed after stretching the wire cathode. It is in. Pulling the shape memory alloy in the circumferential direction of the ring, widening the gap between both end faces, installing the shape memory alloy on the wire cathode by incorporating the gap into the wire cathode, and then removing the shape memory alloy By heating, the shape returns to the conventional memory shape, the gap between both end faces is eliminated, and the shape memory alloy can be prevented from coming off from the linear cathode. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

The feature of the operation of the eighth invention of the present invention is that the inorganic material having the hole is a coil of a spring material in which a part in the circumferential direction is in close contact, and can be penetrated and installed after stretching the wire cathode. . The coil of the spring material penetrates through the wire cathode by fitting all the gaps to the wire cathode in a state where a tension is applied to the coil of the spring material in the axial direction of the coil to widen the gap between the wires. However, by eliminating the tensile force of the coil in the axial direction, a gap between the wires is eliminated, and the coil of the spring material can be prevented from coming off from the wire cathode. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

A feature of the operation of the ninth aspect of the present invention is that the inorganic material having the hole is a ring of a spring material in which both end faces are in close contact, and can be penetrated and installed after the wire cathode is stretched. In a state where a tension is applied to the ring of the spring material in the circumferential direction of the ring to widen the gap between both end faces, the ring of the spring material is installed on the wire cathode by incorporating the wire cathode from the gap, Eliminating the circumferential tensile force of the ring eliminates the gap between both end faces, thereby preventing the ring of the spring material from coming off the wire cathode. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

According to a tenth aspect of the present invention, the inorganic substance having the holes is an insulator, and can electrically maintain insulation even when another structure such as a control electrode contacts the insulator having the holes. Therefore, the electrical insulation between the line cathode and the structure is maintained. Further, brittle fracture due to diffusion of metal into the wire cathode, which is an insulating inorganic substance, can be prevented, and mechanical reliability can be improved. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

The feature of the operation of the eleventh aspect of the present invention is that the inorganic material having the holes is made of the same material as the linear cathode, and the hardness and the crystalline state are the same as those of the linear cathode, so the inorganic material having the linear cathode and the holes Abrasion due to friction between the wire and the cathode, and brittle fracture due to diffusion of metal into the wire cathode is eliminated, thereby improving mechanical reliability. The prevention of the vibration of the line cathode is the same as the operation of the first invention of the present invention.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a linear cathode-spreading structure of an image display device according to a first embodiment of the present invention. FIG. 1 shows only the structure of one end of the linear cathode 2, but the other end has the same shape. The height of the linear cathode 2 is regulated by a height regulating bar 5, and is further positioned in the Y direction by a Y direction positioning frame 6. And each line cathode 2a,
2B, 2C and 2D are tensioned by a linear cathode spring 7 and stretched. In addition, the line cathode 2 is provided with an inorganic material 3a, 3b, 3c, 3d having holes (the hole is larger than the wire diameter of the line cathode). A frame 4 having a groove in the vertical direction of the linear cathode 2 is provided with the frame 3 interposed therebetween.

Consider a case in which an external force such as vibration or impact is applied to the image display device having the linear-cathode stretching portion configured as described above. When an external force is applied, the linear cathode 2 starts oscillating at each natural frequency. Simultaneously with the start of vibration, the linear cathode 2
B. The holes penetrated and installed in 2h, 2d
(A), (b), (c), and (d) cause free motion, and the vibration energy of the linear cathode (2) is converted into free kinetic energy of the inorganic material (3) having the holes, and the vibration of the linear cathode (2) is immediately attenuated. Stop. In addition, the inorganic substance 3 having the hole moves on the linear cathode 2 with free movement, but the position thereof is regulated by the frame 4 having the groove, thereby preventing the inorganic substance 3 having the hole from entering the effective screen. .

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an attachment structure to the wire cathode 2 when the inorganic material having the hole is a shape memory alloy in which the shape of the coil is stored in advance. FIG. 2A shows the memory shape of the shape memory alloy coil 8. The shape memory alloy coil 8 is pulled in the axial direction of the coil to widen the gap between the wires (FIG. B). The coil 8 made of shape memory alloy is penetrated and installed in the wire cathode 2 while being twisted so as to fit the gaps between all the wires (FIGS. C and D). Next, the shape memory alloy coil 8 is heated to return to the conventional memory shape, and the gap between the wires is reduced, so that the wire 8 can be prevented from coming off from the wire cathode 2 (FIG. E). Vibration prevention of the wire cathode 2 and the shape memory alloy coil 8
Is the same as that in the first embodiment.

The third embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a mounting structure to the linear cathode 2 when the inorganic material having the hole is a coil 9 made of a shape memory alloy in which a part in the circumferential direction is in close contact. Figure A is
The memory shape of the shape memory alloy coil 9 that is partially adhered in the circumferential direction is shown. The shape memory alloy coil 9 which is partially adhered in the circumferential direction is pulled in the axial direction of the coil to widen the gap between the wires (FIG. B). The coil 9 made of a shape memory alloy, which is partially adhered in the circumferential direction, is penetrated and installed so as to fit the gap between all the wires into the wire cathode 2 while being twisted (C,
D figure). Next, by heating the shape memory alloy coil 9 in which the part in the circumferential direction is closely contacted, the shape is returned to the conventional memory shape, and the part in the circumferential direction of the coil is securely adhered to eliminate the gap. It is possible to completely prevent detachment from the cathode 2 (FIG. E). The prevention of vibration of the linear cathode 2 and the position regulation of the shape memory alloy coil 9 in which a part in the circumferential direction is in close contact are the same as in the first embodiment.

Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a structure in which the inorganic material having the holes is a shape memory alloy coil 8 and is attached to the wire cathode 2 after being reversed. FIG. 2A shows the memory shape of the shape memory alloy coil 8. Said shape memory alloy coil 8
Is reversed, and then pulled in the axial direction of the coil to widen the gap between the wires to form a shape memory alloy inverted coil 10 (FIG. B).
The reversing coil 10 made of shape memory alloy is penetrated and installed in the wire cathode 2 while being twisted so as to fit the gaps between all the wires (FIGS. C and D). Next, the shape memory alloy reversing coil 1
By heating 0, the gap in the circumferential direction of the coil is forcibly eliminated during the return to the conventional memory shape, so that the coil can be completely prevented from coming off from the linear cathode 2 (FIG. E). . The prevention of vibration of the linear cathode 2 and the position regulation of the shape memory alloy reversing coil 10 are the same as in the first embodiment.

Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows that the inorganic material having the holes is a shape memory alloy in which the shape of the coil is stored in advance, and the number of turns is 1 to 2;
FIG. 3 shows a structure for attaching to the linear cathode 2 when wound. Figure A shows a shape memory alloy contact coil (1-2
Volume 11) shows a memory shape. The close contact coil (1 or 2 turns) 11 made of shape memory alloy is pulled in the axial direction of the coil to widen the gap between the wires (FIG. B). The close contact coil made of the shape memory alloy inserted into the wire cathode 2 from the gap between the wires (1 to 2 turns)
11 penetrate and install. At that time, the shape memory alloy contact coil (1 or 2 turns) 11 is inserted from one direction without twisting.
Can be installed, improving workability (C, D). Next, the shape memory alloy contact coil (1 to 2 turns) 11 is heated to return to the conventional memory shape without a gap between the wires, and the wire is brought into close contact with the conventional shape. (FIG. E). Incidentally, the shape memory alloy contact coil (1 or 2 turns) 11 may be used by being reversed. The vibration prevention of the linear cathode 2 and the position regulation of the shape memory alloy contact coil (1 to 2 turns) 11 are the same as in the first embodiment.

Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 6 shows a structure for attaching to the linear cathode 2 when the inorganic substance having the hole is a shape memory alloy in which the shape of a ring whose both end surfaces are in close contact is stored in advance. FIG. 1A shows a memory shape of the shape memory metal ring 12. The shape memory alloy ring 12 is pulled in the circumferential direction of the ring to widen the distance between the lines (FIG. B). The shape memory alloy ring 12 is inserted into the wire cathode 2 through the gap between the both end faces.
Penetrate and install. At that time, the shape memory alloy ring 12
Can be inserted and installed from one direction without twisting (Figures C and D). Next, the shape memory alloy ring 1
By heating 2, it returns to the conventional memorized shape, and the gap between both end faces is eliminated and adhered to each other, so that the cathode 2 can be prevented from coming off. (Figure E). The vibration prevention of the linear cathode 2 and the close contact coil (1
2) 11 is the same as that of the embodiment shown in FIG.

In the case where the inorganic material having the hole is a coil made of a spring material whose part in the circumferential direction is in close contact, the mounting structure to the linear cathode 2 is the same as that shown in FIG. However, in this case, it is necessary to continuously apply a tensile force to the coil of the spring material in the axial direction of the coil during the penetration and installation into the linear cathode 2. The vibration prevention of the linear cathode 2 and the position regulation of the shape memory alloy contact coil (1 to 2 turns) 11 are the same as in the first embodiment.

When the inorganic material having the hole is a ring of a spring material whose both end surfaces are in close contact with each other, the mounting structure to the linear cathode 2 is the sixth structure.
It is the same as the figure. However, in this case, it is necessary to continuously apply a tensile force to the ring of the spring material in the circumferential direction of the ring during the penetration and installation into the linear cathode 2. The line cathode 2
Vibration prevention and the shape memory alloy contact coil (1-2
The position regulation of the winding 11 is the same as in the first embodiment.

When the inorganic material having the holes is made of the same material as the insulator or the wire cathode, it is the same as in the first embodiment.

In the above embodiment, the material of the shape memory alloy is a Ni / Ti alloy, the insulating inorganic material is ceramic, and the same inorganic material as the linear cathode is tungsten.

Effects of the Invention As described above, according to the first aspect of the present invention, when vibration of the line cathode due to external force applied to the image display device occurs,
By penetrating and installing the inorganic material having a hole at one end or both ends of the line cathode, the inorganic material having the hole immediately causes free movement and absorbs vibration energy, thereby suppressing the vibration of the line cathode. . In addition, since the inorganic substance having the holes is placed and regulated on the effective screen and is securely in contact with the line cathode by weight, there is no variation in the vibration prevention effect, and no change in luminance occurs on the screen. And a stable high-quality image can be provided.

Further, according to the second aspect of the present invention, since the inorganic material having the holes is a shape memory alloy in which the shape of the coil is stored in advance, it is possible to penetrate and install the wire cathode after stretching the wire cathode. Pulling the shape memory alloy in the axial direction of the coil, widening the gap between the wires, fitting the gap to all the gaps with the wire cathode, placing the shape memory alloy on the wire cathode, and then setting the shape memory When the alloy is heated, the gap between the return lines is reduced to the conventional memory shape, so that the shape memory alloy can be prevented from coming off from the wire cathode. The effect of preventing the vibration of the line cathode is the same as the effect of the first invention of the present invention.

According to the third aspect of the present invention, since the memory shape of the shape memory alloy is a coil in which a part in the circumferential direction is in close contact, the line interval of the shape memory alloy is widened and the shape memory alloy is installed on the wire cathode. Thereafter, when the shape memory alloy is heated, the shape memory alloy returns to the conventional memory shape, and a part of the coil in the circumferential direction is securely adhered to eliminate the gap, so that the shape memory alloy is securely prevented from coming off from the linear cathode. You can do it. The prevention of the line cathode vibration is the same as the effect of the first invention of the present invention.

Further, according to the second aspect of the present invention, after reversing the shape memory alloy storing the shape of the coil, the wire between the shape memory alloys is widened and installed on the wire cathode. When the memory alloy is heated, the gap in the circumferential direction of the coil is forcibly eliminated while returning to the conventional memory shape, so that the shape memory alloy can be completely prevented from coming off from the wire cathode. . The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

According to the fifth aspect of the present invention, since the memory shape of the shape memory alloy is a coil in which a part in the circumferential direction is in close contact and the number of turns is one to two, the line shape of the shape memory alloy is reduced. When installing the shape memory alloy on the linear cathode, the shape memory alloy can be inserted and installed from one direction without twisting. Thereafter, when the shape memory alloy is heated, the shape memory alloy returns to the conventional memory shape, and a part in the circumferential direction of the coil is securely adhered to eliminate the gap, so that the shape memory alloy is completely prevented from coming off from the linear cathode. You can do it. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

Further, according to the sixth aspect of the present invention, after the shape memory alloy having the number of turns of 1 to 2 is stored by reversing the shape memory alloy, the distance between the shape memory alloy lines is increased, and When installing, the shape memory alloy can be inserted and installed from one direction without twisting, and when the shape memory alloy is subsequently heated, the coil is forcibly inserted while returning to the conventional memory shape. Since the circumferential gap is eliminated, it is possible to completely prevent the shape memory alloy from coming off the wire cathode. The prevention of the vibration of the line cathode is the same as the first effect of the present invention.

Further, according to the seventh aspect of the present invention, the inorganic material having the hole is a shape memory alloy in which the shape of a ring in which both end faces are in advance is stored, and the inorganic material having the hole can be penetrated and installed after the wire cathode is stretched. It is in. Pulling the shape memory alloy in the circumferential direction of the ring, widening the gap between both end faces, installing the shape memory alloy on the wire cathode by incorporating the gap into the wire cathode, and then removing the shape memory alloy By heating, the shape returns to the conventional memory shape, the gap between both end faces is eliminated, and the shape memory alloy can be prevented from coming off from the linear cathode. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

Further, according to the eighth invention of the present invention, the inorganic material having the hole is a coil of a spring material that is partially adhered in a circumferential direction, and can be penetrated and installed after stretching the wire cathode. . The coil of the spring material penetrates through the wire cathode by fitting all the gaps to the wire cathode in a state where a tension is applied to the coil of the spring material in the axial direction of the coil to widen the gap between the wires. However, by eliminating the tensile force of the coil in the axial direction, the gap between the wires is eliminated, and the coil of the spring material can be prevented from coming off from the wire cathode. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

According to a ninth aspect of the present invention, there is provided a ring of a spring material in which the inorganic material having the hole is in close contact with both end surfaces, and the ring can be penetrated and installed after the wire cathode is stretched. In a state where a tension is applied to the ring of the spring material in the circumferential direction of the ring to widen the gap between both end surfaces, the ring of the spring material is installed on the wire cathode by incorporating the wire cathode from the gap, Eliminating the circumferential tensile force of the ring eliminates the gap between both end faces, thereby preventing the ring of the spring material from coming off the wire cathode. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

Further, according to the tenth aspect of the present invention, the inorganic substance having the holes is an insulator, and even if another structure such as a control electrode contacts the insulator having the holes, the insulation is electrically maintained. it can. Therefore, the electrical insulation between the line cathode and the structure is maintained. Further, since it is an insulating inorganic substance, brittle fracture due to diffusion of metal into the wire cathode can be prevented, and mechanical reliability can be improved. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

According to the eleventh aspect of the present invention, the inorganic material having the holes is the same material as the linear cathode, and the hardness and the crystalline state are the same as those of the linear cathode. Wear due to friction can be reduced, and brittle fracture due to diffusion of metal into the wire cathode is eliminated, so that mechanical reliability can be improved. The prevention of the vibration of the line cathode is the same as the effect of the first invention of the present invention.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a linear cathode spanning portion of an image display device according to a first embodiment of the present invention, and FIG.
FIG. 3 is a structural view of a shape memory alloy coil attached to a linear cathode in the third embodiment of the present invention. FIG. 3 is a perspective view of the shape memory alloy coil having a part in the circumferential direction in close contact with the third embodiment of the present invention. FIG. 4 is a view showing a structure for attaching a shape memory alloy reversing coil to a line cathode according to a fourth embodiment of the present invention, and FIG. 5 is a diagram showing a fifth embodiment of the present invention. FIG. 6 is a diagram showing a structure of attaching a shape memory alloy contact coil (1 or 2 turns) to a wire cathode in FIG. 6; FIG. 6 is an attachment of a shape memory alloy ring to a wire cathode in a sixth embodiment of the present invention; FIG. 7 is a partial perspective view of a conventional cathode control line system for preventing line cathode vibration, and FIG.
The figure is a partial front view of the conventional cathode control line system of the linear cathode vibration prevention measure, FIG. 9 is the vibration mode diagram of the line cathode in the conventional cathode control line system of the linear cathode vibration prevention measure, and FIG. It is a vibration mode diagram of a cathode. 1 ... Back electrode, 2a-2d ... Line cathode, 3a-3d ...
... Inorganic substance having holes, 4 ... Frame body having grooves, 5 ... Height regulating bar, 6 ... Y direction positioning frame body, 7 ... Line cathode spring, 8 ... Coils made of shape memory alloy, 9 ... ... Coil made of shape memory alloy in which a part in the circumferential direction is in close contact, 10 ... Reversal coil made of shape memory alloy, 11 ... Adhesive coil made of shape memory alloy (1 or 2 turns), 12 ... Ring made of shape memory alloy .

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-204302 (JP, A) JP-A-61-171035 (JP, A) JP-A-59-94334 (JP, A) Patent 2776527 (JP, A B2) Patent 2778089 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 31/12-31/15 H01J 29/04

Claims (4)

(57) [Claims] 1. An image display device having one or a plurality of linear cathodes, wherein one or a plurality of holes are previously formed at one end or both ends of said one or a plurality of linear cathodes. An image display device, wherein a shape memory alloy having a shape stored therein is installed in a state where the linear cathode is passed through the hole so that free movement is possible. 2. The image display device according to claim 1, wherein said shape memory alloy is a shape memory alloy in which a shape of a coil is stored in advance. 3. The image display device according to claim 1, wherein the shape memory alloy is a shape memory alloy in which a shape of a coil partially adhered in a circumferential direction is stored in advance. 4. The image display device according to claim 1, wherein said shape memory alloy is a shape memory alloy in which the shape of a ring whose both end surfaces are in close contact is stored in advance.