JPH04218248A - Plate type display unit and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a highly accurate electrode body structure which will hardly cause mechanical distortion in the case of manufacturing as compared with a prior press fitting fixation, and realize a plate type display unit capable of high quality image display by carrying out electrode fixation by fixing a pin, a ring and a support plate together by means of welding while using a laser beam arid/or the like. CONSTITUTION:A pin 48 and a support plate 47 are constituted of metal. The edge part of the pin 48 is connected to the support plate 47 by means of butt weld while using a method such as a laser welding, so that it is implanted without causing distortion or deformation to the support plate 47. Furthermore, this pin 48 carries out through engagement between control electrodes 44, 45 and 46 and spacers 41, 42 and 43, and also projects up to the rear side of an electrode substrate 35. After an insulating sleeve 49 and a metallic ring 50 as a fixing means are embedded in the other edge part of the pin 48, the ring 50 and the pin 48 are fixed by means of the laser welding.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device using an electron beam and a method for manufacturing the same.

0002

2. Description of the Related Art In conventional flat panel display devices, most of the electron beam control electrodes are bonded and fixed using low melting point molten glass, and the electrodes are also insulated. In this configuration, the capacitance between the electrodes increases, which increases power consumption during driving, which poses a serious problem in terms of products.In order to solve the above problem, the applicant used a ring-shaped spacer as an insulating member to control the A new flat panel display device was proposed in Japanese Patent Application No. 1-33994 in which the insulating member is partially disposed between electrodes to reduce the area and capacitance of the insulating member.

[0003] The following is a precedent example of this, Japanese Patent Application No. 1-339.
I will explain No. 94. Figure 9 shows patent application No. 1-339.
6 is a block diagram of a flat panel display device related to electrode fixation shown in FIG. 6 of No. 94. 1 is a face plate formed with an anode 2 containing phosphor on its inner surface. Reference numeral 3 denotes a metal rear container, which together with the face plate 1 forms a vacuum container. 4 is a linear cathode. 6, 7, and 8 are electron beam control electrodes. 9, 10, 11, and 12 are ring-shaped insulating spacers, 13 is an electrode substrate, 14 is an electrode holding plate, and 15 is a fixing pin. The fixing pin 15 is press-fitted into the electrode holding plate. The electron beam 16 emitted from the cathode 4 passes through the control electrode, collides with the anode 2, and emits light.

0004

In the flat panel display device described above, the fixing pins 15 are inserted from behind the electrode substrate and press-fitted into the electrode holding plate 14. The problem with this configuration is that the fixing pin 15 is press-fitted into the electrode holding plate 14, which deforms the electrode holding plate 14 and changes the electric field distribution, which changes the trajectory of the electron beam and impairs the image quality. There was a problem of deterioration.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the flat panel display device of the present invention has the fixing pins of the electrode structure implanted in the electrode holding means in advance, and the fixing members fitted into the pins. After that, the pin and the fixing member are joined and fixed by laser welding.

[0006]

[Operation] When the final connection of the entire electrode assembly is made by using a mechanical method to securely connect the pin that penetrates the electrode assembly to the fixing member, deformation and distortion will occur. By melting and joining the fixing member with the pin using non-contact laser welding, the electrode holding means is prevented from being deformed or strained due to conventional coupling, and a highly accurate electrode structure is realized. be.

[0007]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view of a flat panel display device of the present invention. Figure 2 shows
FIG. 2 is a cross-sectional view when the cross-sectional position is shifted in a direction perpendicular to the plane of the paper in FIG. 1; FIG. 3 is a sectional view taken along line XX in FIG. Figure 4,
FIG. 5 is a manufacturing process diagram of the electrode structure.

In FIG. 1, a face plate 30 has a phosphor 31 formed as an anode on its inner surface. A metal dome container 32 is joined to the face plate 30 by a frit seal 33 to form a vacuum container. 34a to 34e are electrode support posts. As shown in FIG. 3, the posts 34a to 34e are installed around the phosphor 31. As shown in FIG. 2, the height of each post is such that when viewed in the direction of arrow A--A in FIG. 3, the post located at the center position is lower than the post located at the end position.

Reference numeral 35 denotes an electrode substrate, and a rib 36 for increasing rigidity is fixed to the electrode substrate 35 by a metal fitting 37 on the back side. On the anode side of the electrode substrate 35, supports 38 made of an insulating material are arranged at a predetermined pitch. 39
is a linear cathode and is stretched by a spring 40. The cathode 39 is brought into contact with the support 38 . 41,
42 and 43 are ring-shaped spacers made of an insulating material. 44, 45, and 46 are beam control electrodes made of thin metal plates. A plurality of electron beam passage holes are formed in this electrode.

Reference numeral 47 denotes a holding plate as electrode holding means, which is in contact with the control electrode 46. The holding plate 47 is made thicker than the control electrode to increase rigidity. In this configuration, the retaining plate 4
7 is a separate member from the control electrode 46, but the control electrode 46
It is also possible to use it together.

[0011] 48 is a pin for fixing the electrode. pin 48
The retaining plate 47 is made of metal, and the ends of the pins 48 are butt welded to the retaining plate 47 by a method such as laser welding, so that they are implanted without distortion or deformation. The pins 48 penetrate the control electrodes 44 , 45 , 46 and the spacers 41 , 42 , 43 and protrude to the back of the electrode substrate 35 .

Reference numeral 49 is an insulating sleeve that is fitted onto the pin 48. Reference numeral 50 denotes a ring as a fixing means. The ring 50 is made of metal, and after being fitted onto the pin 48, the ring 50 and the pin 48 are fixed by laser welding using a manufacturing method described later. This structure holds the control electrodes (44 to 46) fixed and forms an electrode structure. The pins 48 are arranged at predetermined intervals on the holding plate 47 to partially fix the control electrode. The electrode substrate 35 has electrode support posts 34a to 3 disposed around it.
It is fixed at 4e.

The cathode 39 is heated to extract electrons, which pass through the beam control electrodes 44 to 46 and then collide with the anode 2 to which a high voltage is applied to emit light.

FIG. 4 is an enlarged cross-sectional view of the electrode assembly 55 during the assembly process. Reference numeral 60 denotes a support stand as a first support means, which has high rigidity and forms a concave curved surface in this configuration. Reference numeral 61 denotes a press base as a second support means. The press base 61 has high rigidity, and in FIG. 4, the surface that comes into contact with the electrode substrate 35 forms a convex curved surface on the electrode substrate 35 side.

A pressure means (not shown) applies a weight to the press base 61 to press the electrode assembly against the support base 60 to bend it into a predetermined curved shape, and a predetermined pressure is applied to the entire electrode assembly. 62 is a leaf spring that presses the electrode fixing ring 50. The pressure of the leaf spring 62 on the ring 50 is set to be smaller than the pressure on the electrode assembly. Other parts are shown in Figure 1.
Since it is the same as that, the configuration description will be omitted.

Next, the process will be described. The electrode assembly 55 from the holding plate 47 to the electrode substrate 35 is placed on the support stand 60. The sleeve 49 and the fixing ring 50 are fitted onto the pin 48. The fit between the pin 48 and the ring 50 is such that there is a gap for smooth insertion. Further, the pin is made to protrude slightly from the surface of the ring 50. In this state, the plate spring 62 presses the ring 50 toward the electrode substrate 35 side.

Next, the laser beam 63 is irradiated onto the head of the pin 48 or the fitting portion between the pin 48 and the ring 50 to remove the pin 4.
8 and the ring 50 are melted and joined. FIG. 5 shows a state in which the pin 48 and the ring 50 are joined. The pin 48 and ring 50 are melted and integrally joined. After this bonding and fixation, the plate spring 62 and the press base 62 are removed, and the assembly of the electrode assembly 55 is completed. Since the electrode substrate 35 has high rigidity, the control electrode has a shape that follows the electrode substrate 35 after the electrode is fixed. Further, by reducing the pressure of the leaf spring 62, local distortion of the pin 48 fixing portion can be prevented, and a highly accurate electrode structure can be realized.

FIGS. 6 to 7 show other embodiments of the control electrode fixing structure. 60, 61, 62, 63 are control electrodes, 64
is implanted into the electrode 60 with a metal pin. A metal ring 65 serves as an electrode fixing means, and is inserted into the tip of the metal pin 64. 66, 67, 68, and 69 are insulating spacers.

The metal pin 64 and the ring 65 have a structure in which a portion of the tip of the metal pin 64 and a portion of the ring 65 are melted and bonded using a laser beam. A YAG laser is used as the laser, and 1
．． 2 pulses of 10PPS with 1 joule of energy
Good welding results have been obtained by shot irradiation.

FIG. 7 is a view taken along arrow A in FIG. In this configuration in which only a part of the tip of the metal pin 64 is melted and joined, compared to melting the entire tip of the pin, the irradiation energy is smaller, and the amount of thermal expansion in the pin axial direction when the pin is melted is reduced. The shrinkage length of the pin after melting is reduced, the variation in the fixing force of the laminated electrode is reduced, and a highly accurate electrode can be obtained.

FIG. 8 shows a structure in which the laser beam is irradiated again to other parts of the tip of the pin to increase the bonding force between the pin and the ring. In this way, if a part of the pin tip and the ring are fixed in advance and then the other parts are melted and fixed, the dimensional variation in the pin fixing part will be eliminated, and the laminated electrode assembly accuracy will be increased. can be achieved.

[0022]

[Effects of the Invention] As clarified above, the present invention has a structure in which an electron beam control electrode is assembled and fixed by a fixing pin and a ring-shaped spacer, and the electrode structure with the fixing pin passed through is fixed as a whole. During the electrode fixing process, the pin and fixing ring are inserted without stress or deformation, and then the pin and ring are welded and fixed using a laser beam. This makes it possible to manufacture a flat panel display device with a built-in highly accurate electrode structure, thereby realizing a flat panel display device capable of displaying high quality images.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of an embodiment of a flat panel display device of the present invention.

[Fig. 2] A cross-sectional view of main parts of an embodiment of a flat panel display device of the present invention.

[Fig. 3] Cross-sectional view at the X-X cross-sectional position of the embodiment device in Fig. 1

[Fig. 4] Explanatory diagram of the manufacturing process of the electrode structure of the example device

[Fig. 5] Explanatory diagram of the manufacturing process of the electrode structure of the example device

[Figure 6]
Explanatory diagram of the manufacturing process of the electrode structure of another example device

[Figure 7]
View from arrow A in Figure 6

FIG. 8 is an explanatory diagram of the manufacturing process of the electrode structure of still another example device.

[Figure 9] Cross-sectional view of main parts of a conventional flat panel display device

[Explanation of symbols]

30 Face plate 31 Anode 32 Metal dome container 35 Electrode substrate 39 Cathode 41, 42, 43 Spacer 44, 45, 46 Beam control electrode 47 Holding plate 48 pin 50 ring 55 Electrode structure 60 Support stand 61 Pressing table 62 Leaf spring

Claims (10)

[Claims] 1. A flat panel display device comprising an electron source, an electron beam control electrode, and an anode containing a phosphor inside a vacuum container, the beam control electrode comprising a plurality of thin metal plates, and the electrode. It is composed of a spacer made of an insulating material disposed between the electrode holding means and a plurality of metal pins implanted therein, and the electrode holding means and the beam control electrode are arranged in this order from the anode side, and the holding means A pin implanted in the pin is passed through the beam control electrode and the spacer, and a fixing means is provided to fit into the pin and hold the control electrode group, and the tip of the pin and the fixing means are laser welded. A flat panel display device characterized by being fixed. 2. The flat panel display device according to claim 1, wherein the beam control electrode also serves as electrode holding means. 3. A flat panel display device comprising an electron source, an electron beam control electrode, and an anode containing a phosphor inside a vacuum container, the beam control electrode comprising a plurality of thin metal plates, and the electrode. It is composed of a spacer made of an insulating material disposed between the electrode holding means and a plurality of metal pins implanted therein, and the electrode holding means and the beam control electrode are arranged in this order from the anode side, and the holding means A pin implanted in the pin is passed through the beam control electrode and the spacer, and a fixing means is provided for fitting the pin and holding the control electrode group, and a part of the tip of the pin and the fixing means are connected by a laser beam. A flat display device characterized by being fixed by welding. 4. A flat panel display device comprising an electron source, an electron beam control electrode, and an anode containing a phosphor inside a vacuum container, the beam control electrode comprising a plurality of thin metal plates; It is composed of a spacer made of an insulating material disposed between the electrode holding means and a plurality of metal pins implanted therein, and the electrode holding means and the beam control electrode are arranged in this order from the anode side, and the holding means A pin implanted in the pin is passed through the beam control electrode and the spacer, and a fixing means is provided for fitting the pin and holding the control electrode group, and a part of the tip of the pin and the fixing means are connected by a laser beam. A method for manufacturing a flat panel display device, characterized in that after fixing by welding, the tip of the pin is irradiated with a laser beam at least once to strengthen the bonding force between the pin and the fixing means. 5. A flat panel display device comprising an electron source, an electron beam control electrode, and an anode including a phosphor inside a vacuum container, the electron beam control electrode being connected to an electrode substrate and a plurality of thin metal plates. It consists of a beam control electrode made of a plate, a spacer made of an insulating material disposed between the electrodes, and an electrode holding means in which a plurality of metal pins are implanted. , arranged in the order of the electrode substrate, and a pin implanted in the holding means penetrates the beam control electrode, the spacer, and the electrode substrate,
A flat panel display device characterized in that a fixing means is provided which is inserted into the pin and holds the control electrode group, and the pin and the fixing means are fixed by laser welding. 6. The flat panel display device according to claim 5, wherein a beam control electrode serves both as the electrode holding means and the electrode substrate. 7. The flat panel display device according to claim 5, wherein the electrode substrate has greater rigidity than other electrode members. 8. A beam control electrode composed of a plurality of thin metal plates between an electrode substrate and an electrode holding means, a spacer made of an insulating material disposed between the electrodes, and a spacer implanted on the electrode holding means. An electrode structure comprising a pin made of a metal material that penetrates to the electrode substrate, and a fixing means that is inserted into the pin from the back side of the electrode substrate and holds the control electrode group,
A first support means having a predetermined shape and high rigidity is brought into contact with the surface of the electrode holding means, and a second support means having a predetermined shape and high rigidity is brought into contact from behind the electrode substrate, thereby forming the electrode structure. A method for manufacturing a flat panel display device, comprising: applying a predetermined load to the fixing means; applying a predetermined load to the fixing means to press it against the electrode substrate; and laser welding the pins and the fixing means. 9. The method of manufacturing a flat panel display device according to claim 8, wherein the support means has a curved shape. 10. The method of manufacturing a flat panel display device according to claim 8, wherein the pressure applied by the fixing means is made smaller than the pressure applied by the electrode structure.