JP4687125B2 - Fluorescent display tube - Google Patents

Description

  The present invention relates to a fluorescent display tube, and more particularly, to a grid electrode mounting structure and a connection structure for performing display control of the fluorescent display tube.

In the conventional fluorescent display tube in which anode electrodes and grid electrodes are arranged in a matrix form, especially in the case of a fluorescent display tube for graphic display with a finer display pitch, the grid electrodes must be arranged at a narrow interval in order to achieve this requirement. It is necessary to arrange.
On the other hand, the grid electrode must always maintain a predetermined distance from the anode electrode and the filament, but thermal deformation occurs due to heating during the manufacturing process and driving, and it is difficult to keep the distance constant.
Therefore, various types of grid electrode mounting structures and connection structures have been proposed in order to deal with these points.

FIG. 4 shows an example of a grid electrode mounting structure and a connection structure of a conventional fluorescent display tube.
4A is a plan view of a part of the fluorescent display tube as viewed from above, FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A, and 11 is a vacuum vessel. A glass substrate that is one surface, 12 is a grid electrode, 13 is crystalline glass, 14 is a bonding wire, and 15 is a wiring conductor.
The grid electrode 12 supports a grid-like control electrode portion 12a that controls electrons emitted from the filament to the anode electrode, the control electrode portion 12a, and a support portion 12b that holds a predetermined distance from the anode electrode. A fixed portion 12c that is fixed and connected to the wiring conductor is integrally formed.

  The grid electrode fixing portion 12 c is fixed to the glass substrate 11 by the crystalline glass 13. Since the crystalline glass 13 is an insulator, it can be applied to a plurality of grid electrodes in a strip shape in common by the crystalline glass 13. The end of the fixed portion 12 c of the grid electrode 12 and the wiring conductor 15 are connected by a bonding wire 14. The fixed portion 12c is such that at least a portion to which a bonding wire is connected is covered with Al, Ni, Au, Ag, or the like so that bonding processing is facilitated.

  In the structure of the grid electrode 12 according to this conventional technique, since the control electrode portion 12a, the support portion 12b, and the fixing portion 12c are integrally formed, the mounting structure and the connection structure are simplified. And since the grid electrode 12 is attached to the glass substrate 11 by applying the crystalline glass 13 to the plurality of grid electrodes in a strip shape in common, there is an advantage that the attaching operation is simplified, but the bonding wire 14 is used. Since the grid wiring pattern is connected, the display area is limited and the manufacturing process is complicated.

Next, a conventional example of a fluorescent display tube having a grid electrode structure without wire bonding is shown in FIG.
In this figure, 21.21..., Grid electrodes, 22.22. ... Are phosphor layers (anode electrodes) arranged in a direction perpendicular to the grid electrodes. The grid electrodes 21, 21,... Are respectively connected to the phosphor layers 22.22. .. Are disposed on the anode substrate with a predetermined gap, and the spacer 23 is fixed to the substrate on the anode side by the crystalline glass 24.
25.25. ... Are grid electrodes 21.21. ... and the land part 26.26 of the grid wiring pattern. Are electrically connected to each other, the tip of which is divided into two forks, one tip to the end of the grid electrode 21.21 ... and the other tip to the printed circuit board. .. Are pressed against the glass substrate by a cover glass 27 so as to be in pressure contact with the land portions 26.26...
Then, a grid electrode driving semiconductor chip 30 and grid wiring lands 26.26. ... are connected.

In this grid electrode installation configuration according to the conventional example, the gap between the grid and the anode electrode can be secured by the spacer 23, and the grid electrode terminal is drawn out by the metal strip 25.25 as described above. Therefore, a signal can be supplied to the grid electrode terminal without using a wire bonding technique.
However, in order to install the grid electrode 21.21, a step for fixing the spacer 23 with the crystalline glass 24 is required, and the metal strip 25 and the metal strip 25 are fixed for drawing out the electrode terminals. A process is required, and the display area is limited by the spacer glass 23 and the metal strip 25 for the process, and the manufacturing process is complicated.

Japanese Patent Application No. 2001-216926 JP-A-5-266835 JP-A-5-266836 Japanese Patent Application No. 6-1111736

  As described above, in the conventional fluorescent display tube mounting structure for grid electrodes especially for phi pitch, those using bonding wires have a problem that the structure is complicated and the assembling work is not easy. In addition, when using an external lead material for the terminal connection part of the grid electrode, a glass spacer or external lead mounting process is required to maintain the grid electrode at a predetermined gap with respect to the anode electrode surface. There is a problem that it is difficult to narrow the electrode interval.

  The present invention has been made in order to reduce such problems, and devised connection and fixing for grid electrodes that are mounted on the anode substrate with a predetermined gap, and the grid electrodes are used for narrowing. The object of the present invention is to make it possible to easily construct a grid structure with intervals and to simplify the manufacturing process as much as possible.

In order to achieve the above-mentioned object, the fluorescent display tube of the present invention has a filament built in a vacuum hermetic container, an anode electrode formed on one surface of a glass container constituting the vacuum hermetic container, and the filament to the anode. In a fluorescent display tube having a grid electrode for controlling electrons emitted to the electrode,
The grid electrode is integrally formed with a control electrode portion, a support portion that can hold the control electrode portion at a predetermined distance from the anode electrode, and a fixing portion, and a fixing portion.
At least a part of the fixed part includes a leg part connected to a grid wiring conductor part formed on one surface of the glass container by a conductive material through a through hole, and includes the support part including the leg part and Most of the fixing part is fixed on the anode electrode substrate with crystalline glass.

In the fluorescent display tube of the present invention, the grid electrode can be formed by a dual wire method on a plurality of wire-shaped metal plates having a substantially rectangular cross section, and the grid interval can be 0.2 to 0.8 mm.
In addition, the grid electrode support portion and the fixing portion are separated into two or more leg portions, and one of the leg portions is directly connected to the grid wiring by the conductive paste, and the grid electrode The plurality of leg portions formed on the electrode fixing portion are configured to be cut leg portions at portions connected to the connecting portion of the grid electrode frame except for the connecting leg portions.

In the fluorescent display tube of the present invention, the control electrode part, the support part, and the fixed part are integrally formed as a grid electrode for controlling electrons emitted from the filament, and are connected to the grid wiring conductor. The fixed portion includes a plurality of legs, and a connection portion and a fixing portion are formed.
Then, the grid wiring conductor formed on the glass substrate and the connection portion are fixed so as to be electrically connected through the through hole, and the support portion and the legs constituting the fixing portion are crystallized with respect to the glass substrate. Since it is fixed with a conductive glass, a special jig is not required when the grid electrode, especially the wire-like grid electrode is mounted on the anode substrate with a predetermined gap, and the manufacturing process is facilitated. Become.

In addition, since the control electrode portion having a narrow grid interval can be connected to the grid wiring conductor without using the wire bonding technique, there is an effect that the display area of the fluorescent display tube is widened and the viewing angle is widened.
Further, according to the present invention, the gap with the anode substrate is ensured by molding the grid electrode, and the grid electrode and the grid wiring pattern are connected through the through hole, and each grid electrode is fixed to the anode substrate. Since it can be integrated by the connecting portion, there is an advantage that the grid pitch is kept uniform and it is stacked by the crystallized glass and does not cause thermal deformation.

That is, since the grid electrode of the present invention integrally forms the control electrode portion, the support portion, and the fixed portion, it is not necessary to provide a special support portion and a fixed portion, and crystalline glass is commonly used for a plurality of grid electrodes. Since it can be attached to a glass substrate simply by applying in a strip shape, the number of components is small, the structure is simple, and the assembly work is facilitated.
Since the connecting leg in the grid electrode fixing part of the present invention is configured to face the connecting part of the grid electrode frame at a predetermined interval, the leg of the leg is cut during assembly. It is possible to prevent deformation and poor connection.

FIG. 1 is a plan view showing an embodiment of the grid electrode 20 of the fluorescent display tube according to the present invention. FIG. 1A is a plan view of the grid electrode 20 fixed on the anode substrate 10, and FIG. It is the side view which made the AA line of a grid electrode the cross section.
In this figure, a plurality of wire-like grid electrodes 20 with a part omitted are plate-like frames made of, for example, 426 alloy (alloy such as 42% nickel, 6% chromium, and iron) as described later. The control electrode portion 20a, the support portion 20b, and the fixing portion 20c are configured by a process such as punching out a predetermined shape and press forming.

Reference numeral 30 denotes an anode electrode portion provided on the upper surface of the anode substrate 10, which is arranged in a stripe shape in a direction orthogonal to the grid electrode 20 in this example so that graphic display is possible. Reference numeral 40 denotes the position of the filaments built in the vacuum vessel in the direction orthogonal to the grid electrode 20.
Each of the anode electrodes 30 is configured by placing a phosphor layer 31 on the upper surface of an anode electrode portion 32, and the anode electrode portion 32 is connected to an anode driving semiconductor chip (not shown).

  In this example, the support portion 20b and the fixing portion 20c at both ends of each grid electrode 20 are separated into a plurality of legs (20x, y) as shown in FIG. Each of the leg portions (20x) is bonded to the intermediate through-hole 60 by a conductive material 50 formed by baking a conductive paste. And it is electrically connected with the grid wiring conductor 70 printed on the surface of the anode substrate 10 through the internal through-hole 60 penetrating the insulating layer 80, and the grid is connected through the wiring pattern as shown by a one-dotted line. The semiconductor chip 100 for driving is connected. The right and left fixing legs (20y) are positioned and fixed on the anode substrate 10 by the crystallized glass 90 together with the intermediate connecting legs (20x).

2 (a) and 2 (b) show an example of a greed frame before placing the grid electrode 20 on the anode substrate, that is, before processing the grid electrode into a grid electrode. A 426 alloy plate is punched into a ladder shape. The shape is shown.
In this example, a wire-like grid is shown in which the interval between the control electrode portions is 0.2 to 0.8 mm, and only one end portion is shown, but both end portions are connecting portions 20f. .
FIG. 2A shows a case where the leg is divided into three forks, and FIG. 2B shows a case where the leg is made into two forks.
Each grid frame is bent and formed along the lines B1 and B2 as shown in FIG. 3 to form the support portion 20b and the fixing portion 20c of the grid electrode 20, and the cut line C1. Thus, the grid electrode part is separated.

In this embodiment, as shown in FIG. 2 (a), both sides of the grid electrode are formed with a three-legged leg portion 20 (x, y) from the support portion 20b to the fixing portion 20c, and a central portion serving as a connection portion. The leg portion 20x is configured to be shorter than the leg portion 20y serving as the left and right fixing portions.
Then, the grid frame is bent as shown in FIG. 3, and the connecting portion 20f is cut off at the cut line C1 before being fixed at a predetermined position on the anode substrate side.
In the case of FIG. 2 (b), which is a bifurcated leg, one connecting leg 20x is shorter than the other fixing leg 20y, and only the leg 20y is cut from the connecting part 20f. The part 20x is connected to the grid wiring conductor by a conductive material.
The cut line C1 is preferably provided with a cut groove or a notch by half-edging or the like so as to be easily separated, but in the case of FIGS. 2A and 2B, it is not always necessary. Absent.

The fluorescent display tube according to the present invention having three legs is formed by first forming an anode wiring pattern and a grid wiring pattern on an anode substrate 10 made of a glass plate by aluminum vapor deposition or the like, and serving as an anode electrode 30. Then, an anode electrode part and a phosphor layer are formed.
Then, the molded grid frame is placed at a predetermined position of the glass anode substrate 10 on which the anode electrode 30 is formed, and silver is a main component at a position corresponding to the center leg portion 20x of each grid electrode 20. The conductive paste is attached by thick film printing. Then, by firing this paste, the connection portion (leg portion 20x) of the grid electrode portion is temporarily fixed on each intermediate through-hole for grid wiring formed in advance on the anode substrate, and the grid electrode and the grid wiring conductor Between the two.

Further, paste containing crystalline glass as a main component so as to cover the conductive material 50, legs, etc., is applied to the entire fixed part including the support part of each grid electrode 20, and is baked by a heating furnace or the like to melt the glass. By doing so, the grid frame is fixed on the anode substrate by crystallized glass.
The conductive paste applied to the connecting leg portion 20x by the thick film printing method can be prevented from flowing out in a wide range by the leg portion 20y, and a short circuit between adjacent grid electrodes can be prevented even in the fine pitch case. It has a function.

Note that the cut-off line C1 of the alternate long and short dash line can be easily cut off from the connecting portion 20f by providing a groove along this line by half-edging in advance.
Further, since the leg portion 20x and the connecting portion 20f are opposed to each other at an interval (about 1.8 mm), the leg portion 20x is prevented from being deformed at the time of separation, so that connection failure of the connection portion due to the conductive paste. Can be prevented.

In the example of FIG. 2 (b), the connecting and fixing leg portion is formed in two forks, the longer leg portion 20y is mainly used for fixing, and the shorter leg portion 20x with respect to the through hole. Configure the connecting part for intermediate.
Since the grid frame of this example has two legs, the grid frame is suitable when priority is given to setting the grid interval narrower.

FIG. 3 shows a perspective view when the grid frame is bent and formed.
In this figure, B1 and B2 are bending lines for constituting the support part, and C1 shows a line for separating the connecting part 21.
When the angle θ between the folding lines B1 and B2 is increased, the display area of the fluorescent display surface can be further increased.

In the above embodiment, both sides of the grid electrode 20 are constituted by three legs 20 (x, y),
Although the conductive paste is applied to the leg 20x at one end of the grid electrode 20, although not shown, the leg 20x at the other end of the grid electrode 20 is used alternately. Electrical connection with the grid wiring pattern may be performed.
In this case, the conductive paste can be applied alternately to the left end portion and the right end portion of the grid electrode 20 arranged in a stripe pattern so as to be electrically connected to the grid wiring pattern. It will be useful when you do.

  The grid electrode mounting structure and connection structure of the present invention is a so-called chip-on-glass (COG) in which a grid for controlling a fluorescent display tube or a semiconductor driving IC for supplying and controlling signals to an anode electrode is mounted on a glass substrate. Alternatively, it can be applied to a so-called chip-in-glass (CIG) type fluorescent display tube in which an IC is mounted in a vacuum container. The grid electrode of the present invention is particularly useful when performing graphic display with a dual wire grid electrode.

The top view and sectional drawing of the attachment structure and connection structure of the grid electrode of embodiment of this invention are shown. The top view of the Example of the grid electrode before the process of this invention is shown. The perspective view at the time of shaping | molding of the grid electrode of this invention is shown. The top view and sectional drawing of the attachment structure and connection structure of a grid electrode of a prior art example are shown. The top view of the attachment structure and connection structure of another grid electrode of a prior art example is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anode substrate 20 Grid electrode 20a Control electrode part, 20b Support part, 20c Fixing part, 20 (x, y) Leg part 30 Anode electrode 40 Filament 50 Conductive material (paste)
60 Through hole 70 Grid wiring conductor 80 Insulating layer 90 Crystalline glass 100 Semiconductor driving chip

Claims (5)

Filaments in a vacuum-tight container,
An anode electrode formed on one surface of a glass container constituting the vacuum hermetic container;
In a fluorescent display tube comprising: a wire-like grid electrode having a substantially rectangular cross section with an interval of 0.2 to 0.8 mm for controlling electrons emitted from the filament to the anode electrode,
The wire-shaped grid electrode has a control electrode part, a support part that can hold the control electrode part at a predetermined interval from the anode electrode, and a fixing part, and a fixing part, and is integrally molded. And
The support portion, and the fixing portion, at the tip of the wire-like grid electrodes, the three legs of the two legs for fixing the left and right legs for the central connection and the leg portions for the connection Formed separately,
The connecting leg, which is shorter than the fixing leg, is formed on one surface of the glass container by a conductive material formed by firing a conductive paste through a through hole. Connected to the grid wiring conductor, and fixed to the anode substrate on which the anode electrode is arranged with crystalline glass , together with the left and right two fixing legs ,
Fluorescent display tube . In the grid frame formed by connecting a plurality of the wire-like grid electrodes by connecting portions connected to the two left and right fixing legs, the left and right fixing legs The fluorescent display tube according to claim 1, wherein each of the fluorescent display tubes is cut . The fluorescent display tube according to claim 2, wherein the grid frame is formed such that a tip of the connecting leg portion and the connecting portion are spaced apart from each other . 4. The fluorescent display tube according to claim 3, wherein a groove for cutting is formed in advance on the two left and right fixing legs of the grid frame by half-edging . Wherein the anode substrate is a semiconductor chip for driving掲置, according to one of claims 1 to 4 wherein the grid conductor and the anode electrode to the semiconductor chip, characterized in that it is connected fluorescent display tube.

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