JP2002343284A - Grid structure and fluorescent character display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an interval between grids adjacently provided and correspond with the dense arrangement of an anode. SOLUTION: Plural support parts 5 are provided along an outer periphery 1 of a rectangular grid G. The support part 5 is in a shape of a rectangle, and an end thereof is connected to the outer periphery 1 of an electrode part 3. When using the grid G separated, a connection part 6 is cut off and the support part 5 is bent. The support part 5 is bent in a locus, containing the linearly outer periphery 1 and along a surface vertical, with respect to the electrode part 3. The support part 5 works as a support leg for holding the electrode part 3 at a predetermined height. It is not necessary to enlarge the interval between the adjacent grids, and the interval between the anodes 4 and 5 can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a grid electrode used for a fluorescent display tube, and more particularly, to a grid structure in which a plurality of grids are integrally formed in the same frame. The present invention relates to a grid structure in which the intervals between grids can be reduced as much as possible in accordance with the increase in density, and to a fluorescent display tube using such a grid structure.

[0002]

2. Description of the Related Art A general fluorescent display tube has an envelope whose inside is maintained in a high vacuum state. Inside the envelope, an anode is formed on the upper surface of the anode substrate that forms a part of the envelope. The anode includes an anode conductor formed on an anode substrate and a phosphor provided on the anode conductor. Further, in the envelope, a grid is disposed above the anode, and a filament cathode serving as an electron source is disposed further above the grid.

In recent years, high display performance has been demanded for display elements. In the technical field of fluorescent display tubes, there is a tendency that a high display density is required to improve display performance, and that light emission patterns provided at a high display density are driven independently of each other. This means that it is necessary to arrange the anodes at a high density, and that it is necessary to reduce the arrangement intervals of grids provided corresponding to the anodes in order to control the driving of the anodes.

The grid is a metal part in which a support tab is integrally formed around a mesh-shaped electrode portion, and is generally manufactured by etching. At the time of assembling the fluorescent display tube, the tab is bent to be a supporting leg, and is placed on the anode substrate so that the electrode portion is placed on the anode conductor.

In a fluorescent display tube having a large number of grids,
A grid structure as schematically shown in FIG. 5 may be used. In this grid structure, a plurality of grids G (1, 2, 3,...) Are fixedly connected to a frame (frame-shaped body) 100 by connecting portions (not shown). In manufacturing a fluorescent display tube using a grid structure, first, each grid is cut off and held in a holding mold having a holding portion corresponding to each grid. The holding type is provided with a magnet, and the separated grids are held in a predetermined arrangement. Next, the support tab is formed by bending the tab of each grid held by the holding die by pressing. The processed grid is transported together with the holding mold onto the anode substrate on which the anode has been formed in a separate step, and is positioned and fixed on the anode substrate in alignment with the anode.

FIG. 3 is a plan view showing a connection relationship between adjacent grids in a conventional frame structure and a relationship with an anode (phosphor), and FIG. 4 is a partially enlarged view of an example of the conventional frame structure. It is. As shown in FIGS. 3 and 4A, the peripheral frame 1 of the grid G is in the same plane as the grid G.
The tabs 2 extending vertically from 0 include those 2b that are connected to adjacent grids and those that are not 2a. As shown in FIG. 4B, adjacent grids G
Tabs 2b connected to grids G1, G2
2 are cut along a direction substantially parallel to the outer circumference 1 and are further bent downward along a plane substantially perpendicular to the outer circumference 1 of the grids G1 and G2 and the electrode portion 3 to form supporting legs.

As shown in FIGS. 3 and 4 (a), the interval between two adjacent grids G1, G2 is determined by the cut dimensions and the cut allowance of the tabs 2a, 2b serving as support legs.
It cannot be reduced below a certain value. That is, since the dimensions of the tabs 2a and 2b serving as the support legs are dimensions that determine the height of the electrode portion 3 supported on the anode, the dimensions must be set to a predetermined size. , G
2 cannot be reduced, and the anode density cannot be increased.

[0008]

SUMMARY OF THE INVENTION The present invention provides a grid structure which can be adapted to the arrangement of high-density anodes because the distance between adjacent grids can be reduced, and a fluorescent display tube using such a grid structure. It is intended to be.

[0009]

According to a first aspect of the present invention, there is provided a grid structure which is formed integrally with an electrode portion and an outer periphery of the electrode portion so as to be located on the same plane as the electrode portion, and is later bent. In a grid structure including a grid having a support portion provided for supporting an electrode portion, in a grid structure in which a plurality of the grids are integrally connected, the support portion is formed in a longitudinal shape along the outer periphery of the electrode portion. And one end thereof is connected to the outer periphery of the electrode portion.

According to a second aspect of the present invention, there is provided a fluorescent display tube, comprising: a grid having an electrode portion and a support having a longitudinal shape extending along the outer periphery of the electrode portion and having one end connected to the outer periphery of the electrode portion. The support portion is bent along a locus along the surface including the outer periphery and perpendicular to the substrate, and is placed on the upper surface of the substrate on which the anode is formed.

According to a third aspect of the present invention, there is provided a grid structure having a substantially planar electrode portion having a linear outer periphery, and one end integrated with the outer periphery of the electrode portion so as to be located on the same plane as the electrode portion. A grid having a support portion having a longitudinal shape connected to the support portion, which is bent along a trajectory along a plane perpendicular to the electrode portion, including the outer periphery, and provided for supporting the electrode portion, wherein the grid before bending is provided. It is characterized in that a plurality of the grids arranged with a support portion therebetween are integrally connected to a frame.

According to a fourth aspect of the present invention, there is provided a fluorescent display tube having a substantially planar electrode portion having a linear outer periphery, and one end provided at one end of the outer periphery of the electrode portion so as to be located on the same plane as the electrode portion. A grid having a longitudinally-shaped support portion integrally connected and a support portion bent including a locus along a plane perpendicular to the electrode portion, including the outer periphery, was placed on the upper surface of the substrate on which the anode was formed. It is characterized by:

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the relationship between two adjacent grids G1, G2 and anodes 4, 5 (phosphor) in the frame structure of this example. Although two grids G1 and G2 are shown in FIG. 1, there may be three or more grids, and these grids are connected to form a frame structure as a whole.
FIG. 2 is a partially enlarged view of the frame structure of the present example, particularly showing the shape and bending direction of the support portion 5 (tab) different from the conventional one.

The grid G is a rectangular electrode member having a linear outer periphery 1. A substantially planar electrode portion 3
A plurality of support portions 5 are provided on the outer periphery 1 of the (mesh portion). Each support portion 5 is a member having a long shape (for example, a strip shape in this example), one end of which is connected to the outer periphery 1 of the electrode portion 3 and the other portion is disposed along the outer periphery 1 of the electrode portion 3. . Before cutting the connecting portion of the frame or bending the support portion 5, the support portion 5 and the electrode portion 3 are formed so as to be located on the same plane.

As shown in FIGS. 2A and 2B,
When the grids G are used separately, the connecting portions 6 connecting the grids are cut, and the supporting portions 5 are bent. The downward bending direction of the support portion 5 is different from the conventional one, and as shown by an arrow in FIG.
And is bent with a locus along a plane perpendicular to the electrode portion 3. Thereby, the support part 5 becomes a support leg for holding the electrode part 3 at a predetermined height.

As described above, the grid G of the present embodiment has the outer periphery 1
Is bent so as to rotate along the outer periphery 1, so that the interval between adjacent grids G, G needs to be widened as in the prior art in order to arrange the support portions 5. In addition, the interval between the electrode portions 3 of the grid can be reduced. Therefore, as shown in FIG. 1, the interval between the adjacent anodes 4 and 5 (phosphors) respectively corresponding to the two adjacent grids G1 and G2 can be reduced. For example, the distance between adjacent anodes was about 2.8 mm in the related art, but in this example, the other conditions were all about the same, and could be about 2.2 mm.

The procedure for fabricating a fluorescent display tube using the grid structure of the present embodiment is the same as that of the related art. The grid which is taken out of the grid structure and the supporting portion is bent is set at a predetermined position on the anode substrate of the fluorescent display tube, and is disposed under the insulating layer of the anode substrate and exposed to the wiring terminal exposed at the position. Are connected by a conductive adhesive.

In this embodiment, the grid is rectangular, and a strip-shaped support portion is provided along the outer circumference on a straight line, and the support portion is bent in a manner to be pivoted downward. But,
The outer periphery of the grid is not limited to a straight line. For example, substantially the same effect as in the first example can be obtained by bending the outer periphery of the grid into a curved shape and the supporting portion into a correspondingly curved shape and turning the supporting portion downward in the same manner as in the first example. Is obtained.

[0019]

According to the grid structure of the present invention, since the elongated supporting portion disposed along the outer periphery of the electrode portion is connected to the outer periphery of the electrode portion at one end, the elongated supporting portion is provided. The part can be bent so as to be pivoted along the outer periphery, and the distance between adjacent grids can be made smaller than before. Therefore, the distance between the adjacent anodes (phosphors) respectively corresponding to two adjacent grids can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first example of an embodiment of the present invention.

FIG. 2A is a partial perspective view showing a first example of the embodiment of the present invention, and is a view before a grid electrode is separated;
(B) is a partial perspective view showing a first example of an embodiment of the present invention, and is a view after a grid electrode is cut off.

FIG. 3 is a plan view showing a part of a conventional grid structure.

FIG. 4A is a partial perspective view showing a conventional example before a grid electrode is cut off, and FIG. 4B is a partial perspective view showing a conventional example after a grid electrode is cut off. It is.

FIG. 5 is a conceptual diagram for explaining a general grid structure.

[Explanation of symbols]

 G… Grid 1… Outer circumference 3… Electrode part 5… Support part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoyuki Exit 629 Oshiba, Mobara-shi, Chiba Futaba Electronics Co., Ltd. F-term (reference) 5C036 EE03 EE19 EF01 EF03 EF05 EF07 EF08 EG02 EG15 EH04

Claims (4)

[Claims] 1. A grid having an electrode part and a support part integrally molded on the outer periphery of the electrode part so as to be located on the same plane as the electrode part, and later bent to be used for supporting the electrode part, In a grid structure in which a plurality of the grids are integrally connected, the support portion is formed in a longitudinal shape along an outer periphery of the electrode portion, and one end thereof is connected to an outer periphery of the electrode portion. A structure for a grid, characterized in that: 2. A grid having an electrode portion and a support portion having a longitudinal shape along the outer periphery of the electrode portion and having one end connected to the outer periphery of the electrode portion, the grid being perpendicular to the electrode portion and extending along a plane including the outer periphery. What folded the support part with a locus,
A fluorescent display tube mounted on the upper surface of the substrate on which the anode is formed. 3. A substantially planar electrode portion having a linear outer periphery, and a longitudinal support portion integrally connected at one end to the outer periphery of the electrode portion so as to be located on the same plane as the electrode portion. And a grid having a support portion including the outer periphery and bent along a plane perpendicular to the electrode portion and used for supporting the electrode portion, wherein a plurality of the support portions are arranged between the support portions before bending. A grid structure, wherein the grid is integrally connected to a frame. 4. A substantially planar electrode portion having a linear outer periphery, and a longitudinal support portion integrally connected at one end to the outer periphery of the electrode portion so as to be located on the same plane as the electrode portion. A fluorescent display tube, comprising: a grid having a supporting portion including the outer periphery and bent along a plane perpendicular to an electrode portion, on a substrate on which an anode is formed.