JPH0221545A - Display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a display device used in television receivers, computer terminal displays, and the like.

Conventional technology A conventional display device will be explained below based on the drawings.

As a conventional display device, for example, Japanese Patent Application No. 61-265
No. 104 and Japanese Patent Application No. 61-269422. FIG. 8 is a side sectional view of the display device proposed in the above application, and FIG. 9 is a plan sectional view taken along the XX' plane. In FIG. 8, the display device has a back electrode 4 and an electron beam extraction electrode 5 disposed at the rear of a vacuum envelope 7 with a phosphor screen 6 formed inside the display surface so as to sandwich a cathode 1 therebetween. Two insulating spacers 9 and lO sandwich a plurality of guide fibers 8 that regulate the position of the cathode 1 in order to regulate the relative position.
is installed. Furthermore, the electron beam extraction electrode 5
After that, two control electrodes 13 and 14 whose spacing is regulated by two insulating spacers 11 and 12 are arranged one after another, and behind them, as shown in FIG. A planar horizontal deflection electrode 16 having a plurality of needle-like pillars 16a perpendicular to the paper surface of FIG.
It is placed perpendicular to the plane of the diagram.

In addition, the cathode 1 is fixed to both sides of the insulating holder 150.
It is fixed to the tip of a letter-shaped leaf spring 17 and is stretched. Further, a back plate 18 is hermetically fixed to the vacuum envelope 7 so as to be in contact with the back electrode 4. After assembling as shown in FIG. 8, when the inside of the vacuum envelope 7 is evacuated, the back plate 18, the insulating spacers 9 and 10, and the electron beam are moved along the shape of the insulating holder 15 as shown in FIG. Extraction electrode 5, insulating spacers 11 and 12, control electrodes 13 and 1
4 transforms. With this deformation, the cathode 1 has a guiding fiber 8 sandwiched between two insulating spacers 9 and 10.
The electrode 4 is stretched between the back electrode 4 and the electron beam extraction electrode 5 with a predetermined distance therebetween. Thereafter, in order to vent the gas inside the vacuum envelope 7, a baking process is performed in which the entire vacuum envelope 7 is heated to about 300° C. while the inside of the vacuum envelope 7 is kept evacuated. After this, the cathode I is activated and aged to complete the display device.

Problem to be Solved by the Invention However, in the above configuration, the electron beam extraction electrode 5 and the control electrodes 13 and 14 are made of thin metal plates, and the insulating spacer 9
．． 10, 11 and 12 are made of alumina or glass-based insulating material, and the back electrode 4 and horizontal deflection electrode 16 are made of glass-based insulating material.

Further, the vacuum envelope 7 is also made of glass. Usually, a metal plate has a larger thermal expansion coefficient than a glass-based material, and when a non-magnetic metal material is used, the difference in thermal expansion coefficient between the metal plate and the glass-based material is about 100 to 150×10 −7 . Therefore, when the inside of the vacuum envelope 7 is evacuated in the baking process, atmospheric pressure acts on the electrodes inside the vacuum envelope 7, and when heated in the baking process in that state, the insulating spacers 9, 10, 11, and 12 In contrast, the electrode plates 5.13 and 14 formed of metal plates try to expand further, but the electrode plates 5.13 and 14 formed of metal plates are connected to the insulating spacers 9.10.11 and 12. The friction between the two creates a force that prevents expansion. For this reason,
The electrode plates 5.13 and 14 are deformed and many minute wrinkles occur. When wrinkles occur, the electron beam passing holes formed in the electrode plate become tilted or the spacing between the electron beam passing holes becomes irregular, which changes the trajectory of the electron beam, making it impossible to obtain high-quality images. was occurring.

An object of the present invention is to provide a display B rR that solves the problems of such conventional display devices.

Means for Solving the Problems The present invention as claimed in claim 1 provides at least a back electrode, a cathode, and laminated electrode plates in a vacuum envelope including a front plate having a phosphor screen formed on the inner surface and a back plate. a plurality of supporting walls that support atmospheric pressure acting on the vacuum envelope; and a recess having a predetermined curvature that forms a convex shape in the cathode longitudinal direction of the back electrode inside the vacuum envelope. a member, a pressing means for pressing the laminated electrode plate against the back electrode;
The display device includes a support plate that supports the pressing means from the front plate side, and the back plate side of the support plate is formed in a shape having a curvature comparable to that of the concave member.

The present invention according to claim 2 provides a vacuum envelope including a front plate having a phosphor screen formed on the inner surface and a back plate, at least a back electrode, a cathode, laminated electrode plates, and the vacuum envelope. a concave member having a predetermined curvature that forms a longitudinal direction of the cathode of the back electrode into a convex shape inside the vacuum envelope; The display device includes a pressing means for pressing the electrode plate against the back electrode, and a pressing portion of the pressing means has a pressing width and a pressing height that gradually become smaller from an end in the longitudinal direction of the cathode to a central portion.

action The present invention has the following effects based on the above configuration.

In other words, the atmospheric pressure that acts on the vacuum envelope does not act directly on the stacked electrode plates, and the stacked electrode plates are pressed by a pressing means that is sufficiently small compared to atmospheric pressure and that a uniform pressing force is applied in the longitudinal direction of the cathode. Because the electrode plate and the insulating spacer are pressed against the back electrode plate by the There is no slippage between the electrode plate and the spacer, and no force that would deform the electrode plate is applied, so that a display device that displays good images can be obtained.

Embodiments Below, embodiments of a display device according to the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a display device according to an embodiment of the present invention, and FIG. 2 is a sectional view perpendicular to the sectional view of the display device in FIG.

The display device 101 includes an electrode assembly 103 within a vacuum envelope 102.
It is configured by arranging. The vacuum envelope 102 includes a front plate 105 having a fluorescent screen 104 formed on its inner surface, and a back plate 10 made of a metal plate having a coefficient of thermal expansion of approximately 10xto-''.
6, and a side wall 107 that is located between the front plate 105 and the back plate 106 and surrounds the outer periphery thereof is airtightly bonded. The electrode structure 103 includes a back electrode 108 and an insulating spacer 10
9, a cathode 112 stretched by a spring 111, electrode plates 115 and 116 laminated via insulating spacers 113 and 114, a pressing means 117, and a support plate 118 that supports the pressing means 117.
, a support wall 119, a needle-shaped support 120 planted on the front plate 105 side of the support wall 119, and a plurality of convex support members 121a- as concave members provided on the end of the support wall 119 on the back plate 106 side. 121h. Support member 12
1a to 121h are insulating spacers 109, 113 and 1
14, passes through the electrode plates 115 and 116, the pressing means 117, and the support plate 118, and comes into contact with the back electrode 108. The length of the convex portion of the support members 121a-121h is the cathode]
The center portions of the support members 121a to 121h are lowered in the longitudinal direction, and the envelopes of the end faces of the support members 121a to 121h are configured to have a concave shape with a predetermined curvature. The back plate 108 side of the support plate 118 is formed into a concave shape that approximates the concave envelope line of the end faces of the support members 121a to 121h. Front plate 105, side wall 107, back electrode 108, support wall 119
are the same glass-based material, and the insulating spacer 109.113
and 114 are made of alumina or glass-based material, and have a thermal expansion coefficient of 70 to 100 The coefficient is 170-200
It is X10-7. FIG. 3 is a detailed perspective view of the pressing means 117. The pressing means 117 is formed by bending a thin metal plate, and includes pressing parts 122 and 123 and a base part 124. The pressing parts 122 and 123 are divided into predetermined pressing widths, and press springs 122a to 122n and 123a to 12
3n is formed, and the pedestal part 124 has pressing parts 122 and 1.
23 divided pressure springs 122a to 122n and 1
Slits 124a to 124n-+ are formed in units corresponding to the division widths 23a to 123n.

Next, the operation of the above embodiment having the above configuration will be explained.

When the inside of the vacuum envelope 102 is evacuated, the vacuum envelope 10
2, the back plate 106 and the back electrode 108 are attached to the support members 121a-121 as shown in FIG.
Deflects along the concave envelope line of the h end face. On the other hand, the guide fiber 110, the insulating spacers 113 and 114, and the electrode plates 115 and 116 held between the insulating spacers 109 are pressed by the pressing means 117 and curved into a concave shape along the back electrode 108. Here, the pressing force of the pressing means 117 is set uniformly in the longitudinal direction of the cathode at less than half the atmospheric pressure. If the baking process is carried out under such conditions,
Since the electrode plates 115.116 have a larger coefficient of thermal expansion than the insulating spacers 109.113 and 114, the electrode plates 115.
116 is an insulating spacer]09.It expands from 113 and 114.

However, since the pressing force of the pressing means 117 is small, the electrode plate 1
15, 116 slip between the insulating spacers 109, 113, and 114, and the electrode plates 115, 116 are not deformed by frictional force.

Next, a second embodiment of the display device according to the present invention will be described based on the drawings.

4 is a sectional view of a display device according to the second embodiment, and FIG. 5 is a sectional view perpendicular to the sectional view of the display device of FIG. 4. Guide fiber 11 sandwiched between insulating spacers 109
0. Pressing means 125 for pressing electrode plates 115 and 116 stacked together with insulating spacers 113 and 114 on back electrode 10B is supported by support means 12B. The support means 126 is formed of a flat plate. Pressing means 1
A detailed perspective view of 25 is shown in Fig. 6, and a side view thereof is shown in Fig. 7.
As shown in the figure. The pressing means 125 is formed by bending a thin metal plate, and includes pressing parts 127 and 128 and a base part 129. The pressing portions 127 and 128 are divided into predetermined widths, and pressing springs 127a to 127n and 128a to 128n are formed.

The pressing springs 127a-127n and 128a-128n have predetermined pressing widths 127ay-127ny and 128ay.
~128ny and predetermined pressing height 127az ~ 127nz
and 128az to 128nz. Pressure springs l 27a to 127n and! 28a=128n pressing height 127az ~127nz and 128az ~1
28nz is set to approximately match the concave envelope line of the end faces of the support members 121a to 121h. Also,
Pressing widths 127ay to 127ny and 128ay to 128 of pressing springs 127a to 127n and 128a to 128n
ny is pressing height 127az to 127nz and 128az
It is set so that the change in the pressing force caused by the change in the frequency of 128 nz is absorbed, and the pressing force in the longitudinal direction of the cathode 112 becomes almost uniform. The operation and effects of this second embodiment are similar to those of the first embodiment.

Effects of the Invention The present invention, which has the above-described configuration, has the advantage that a large force due to atmospheric pressure does not act on the electrode plate placed inside the vacuum envelope, and
Since the electrode plate is pressed with a force smaller than atmospheric pressure and uniform in the longitudinal direction of the cathode, the electrode plate will not be deformed or wrinkled during the baking process, resulting in a display that displays a good image. You can get the equipment. Furthermore, in the present invention, there is no problem even if there is a difference in thermal expansion coefficient between the electrode materials placed inside the vacuum envelope, so it is possible to use a non-magnetic metal material that has a large difference in thermal expansion coefficient from a glass-based material. This makes it possible to eliminate landing defects of electron beams due to magnetization, and to obtain a display device that displays stable and good images.

[Brief explanation of the drawing]

1 is a cross-sectional view of a display device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the display device perpendicular to the cross-sectional view of the display device in FIG. 1, and FIG. FIG. 4 is a detailed perspective view of the pressing means of the display device, and FIG. 4 is a sectional view of the display device according to the second embodiment of the present invention. 5 is a sectional view of the display device perpendicular to the sectional view of the display device in FIG. 4; FIG. 6 is a detailed perspective view of the pressing means of the display device; and FIG. 7 is a detailed perspective view of the pressing means of the display device. 8 is a side sectional view of a conventional display device, and FIG. 9 is a side sectional view of a conventional display device.
The figure is a plan sectional view of the display device. 101...Display device, 102...Vacuum envelope, 10
4... Fluorescent screen, 105... Front plate, 106... Back plate, 108... Back electrode, 112... Cathode, 115.116... 9 electrode plate, 117, 125◆-pressing means , 11B... Supporting plate, 119... Supporting wall, 1
21a-121h---Support member (concave member), 127.
128...pressing part, 127ay to 127ny, 128
ay~128ny...pressing width, 127az-127n
z, 128az-128nz...pressing height. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure IU / Figure 2! :2 So Figure 7

Claims (2)

[Claims] (1) A vacuum envelope including a front plate with a fluorescent screen formed on the inner surface and a back plate, at least a back electrode and a cathode,
a stacked electrode plate, a plurality of support walls that support atmospheric pressure acting on the vacuum envelope, and a predetermined portion of the back electrode that is formed in a convex shape in the cathode longitudinal direction on the inside of the vacuum envelope. a concave member having a curvature of A display device characterized in that the display device is formed in a shape having a curvature comparable to that of the concave member. (2) At least a back electrode and a cathode in a vacuum envelope including a front plate with a fluorescent screen formed on the inner surface and a back plate,
a stacked electrode plate, a plurality of support walls that support atmospheric pressure acting on the vacuum envelope, and a predetermined portion of the back electrode that is formed in a convex shape in the cathode longitudinal direction on the inside of the vacuum envelope. a concave member having a curvature of A display device characterized by having: