JPH0136657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a linear electrode for a fluorescent display tube, which is most suitable for displaying high-density graphics.

Fluorescent display tubes display images at low voltage by projecting electrons emitted from a heated filament-shaped cathode onto an anode whose upper surface is coated with phosphor and selectively given an anode potential. It has many features such as sufficient brightness, low power consumption, ability to be driven directly by LSI, etc., and the ability to emit light in a variety of colors depending on the type of phosphor. Therefore, they are often used as display devices for various electronic devices and electric machines.

Recently, there has been a demand for fluorescent display tubes to display not only numbers and characters but also arbitrary figures, images, etc., and in order to display even more precisely, the display height has increased. Densification is desired. In order to achieve such a high density display, a linear electrode such as a control electrode for selecting each pixel is placed in the space between the cathode and anode in the vacuum container, while maintaining a certain distance from both electrodes, e.g. ~0.5mm,
It is necessary to arrange a large number of them at very fine intervals of 1 mm at most, and to prevent short circuits due to mutual contact, and to take into account elongation due to temperature during use, they must be stretched with an appropriate tension uniformly applied. There is a need.

By the way, in the conventionally proposed manufacturing method of fluorescent display tube linear electrodes for graphic displays, etc.,
Thin wires with a uniform cross section are stretched within the vacuum container, and both ends of each thin wire are led out of the vacuum container as they are to serve as connections with an external circuit. For this reason, the fluorescent display tube manufactured by the conventional manufacturing method has the following disadvantages, and there is a problem in that it is difficult to stably perform high-density display.

(1) It is difficult to connect the lead-out portions at both ends of each thin wire to an external control circuit; that is, the contact area is extremely small, making it difficult to connect by soldering or the like.

(2) The pitch spacing of each thin wire tends to become uneven during manufacturing, making it impossible to set the pitch spacing accurately.

(3) Since the connection parts are led out on both sides, it is necessary to cut out the lead-out parts of unnecessary thin wires that are not related to the connection with the external circuit, but it is difficult to select unnecessary thin wires at that time.

(4) Each thin wire is extremely thin, so it is difficult to apply tension.
It is difficult to give uniform tension to each thin wire.

(5) Because the lead-out portion of each thin wire is thin, it is easy to break after connecting to the outside.

The present invention has been made in view of the above points. Specifically, the present invention is capable of tensioning each thin wire with a uniform and sufficient tension with good reproducibility, without the fear of pitch deviation by setting each thin wire at accurate pitch intervals. linear electrodes for fluorescent display tubes that can stably display high-density displays, facilitate connections with external circuits, and allow unnecessary thin lines to be extremely easily selected and removed. It's in the manufacturing method.

Therefore, the present invention has a linear electrode in which a flat connecting part is integrally formed at both ends of a thin wire electrode part, and the length of the connecting part is long at one end and short at the other end, and the wire electrodes are connected at regular intervals. a step of manufacturing an electrode frame that is connected in parallel to the electrode frames; a step of stacking the two electrode frames so that the lengths of the connecting portions are alternately long and short, and applying tension in the longitudinal direction of the linear electrode; The attached electrode frame is fixed at a fixed spatial position via a spacer fixed on the substrate constituting the vacuum container of the fluorescent display tube so that the connection part and the thin wire electrode part alternately protrude outside the vacuum container. The present invention is characterized by comprising a step of selecting and cutting a thin wire-shaped electrode portion outside the vacuum container.

Hereinafter, a method for manufacturing a linear electrode for a fluorescent display tube according to the present invention will be explained with reference to an embodiment shown in the drawings.

First, as an electrode structure for displaying figures, characters, etc. with high density, there is, for example, an anode with a phosphor layer coated on the upper surface and divided into stripes, and a plurality of electrodes arranged in a direction crossing this anode. There is a method in which a matrix is formed with linear control electrodes and a selected intersection of both electrodes emits light, or a method is formed in which a matrix is formed with a cathode and an anode or a control electrode to select pixels. Here, a method will be described as an example in which pixels are selected by assembling a matrix of anodes divided into stripes and linear control electrodes arranged in a direction crossing the anodes.

1A and 1B are a plan view and a sectional view showing an embodiment of a matrix-type fluorescent display tube provided with linear electrodes by the method of manufacturing linear electrodes according to the present invention, and in the figures, 1 is an insulating The substrate 1 is made of a material such as glass or ceramics, and if the substrate 1 is of a so-called front emission type in which light emission from a phosphor layer is observed through the substrate 1, it must be made of a translucent insulating material. The inner surface of this substrate 1 is etched by photo-etching as shown in FIGS. 2 and 3.
A plurality of anode conductors 2 made of a conductive metal film, for example an Al film, are formed in parallel in a stripe shape. A wide anode terminal portion 2a is continuously formed at one end of each anode conductor 2.
The anode terminal portions 2a of adjacent anode conductors 2 are alternately located on opposite sides. Further, in the case of the front emission type, the anode conductor 2 needs to be formed of a transparent conductive film or a mesh-shaped conductive metal film.

A fusion terminal 3 is formed on the anode terminal portion 2a by printing a conductive glass adhesive made of a conductive metal (for example, Ag) and a low-melting glass (for example, frit glass). Furthermore, a glass adhesive material 4 (for example, frit glass) is printed around the four sides of the substrate 1, and an exhaust pipe H is attached.

As shown in FIG. 4, an anode lead frame 5 having a half-etched portion 5b inside is disposed on the fusion terminal 3. As shown in FIG. That is, each terminal portion 5a of the anode lead frame 5 is positioned on each fusion terminal 3 and pressed against the substrate 1 and the side plates 6, 6, and pressed near the anode terminal portion 2a. Once fired and fused, a crystallized glass adhesive G made of, for example, pyroceram paste, which has a softening point higher than the heating temperature when assembling the fluorescent display tube, is adhered and the terminal portion 5a is fused to the terminal. After that, the inner connecting portion 5c of the anode lead frame 5 is separated from the half-etched portion 5b. A phosphor layer 7 is formed on each anode conductor 2 by electrodeposition. In addition, the outer connecting portion 5d is
Terminal section 5a for connecting to an external control circuit, etc.
It is cut in a predetermined process, leaving behind.

On the other hand, as shown in FIG. 5, the front plate 8 of FIGS.
is installed. Anchors 9a and supports 9b are provided at opposite positions of the cathode mounting frame 9, and a filament-shaped cathode 10 is stretched in a direction perpendicular to the anode conductor 2 between each anchor 9a and support 9b. ing. In addition, the front plate 8
Separately apply glass adhesive 1 to the outer periphery of the four sides of the inner surface of the
1 (for example, fritted glass) is arranged by printing.

Next, the linear electrode 12 as a control electrode disposed between the anode conductor 2 on the substrate 1 side and the cathode 10 on the front plate 8 side will be explained.

As shown in FIG. 6, the linear electrode 12 is formed by etching a conductive metal plate into an electrode frame F. It has one and the other connecting portions 14 and 15 integrally formed in a shape. The length l ₁ in the longitudinal direction of one of the connecting parts 14 is larger than the length l ₂ in the longitudinal direction of the other connecting part 15, and the forming width W of each connecting part 14, 15 is as follows.
The width W of each of the connecting portions 14 and 15 is set to be less than or equal to a predetermined pitch P of the electrode portion 13 of the linear electrode 12 and approximately equal to each other. The linear electrodes 12 are integrally arranged in parallel on the quadrilateral frame 16 at the predetermined pitch interval P, and small holes 17 for positioning and mounting are provided near the connecting portions 14 and 15 of the frame 16.
A plurality of 18 pieces are formed.

As shown in FIG.゜The electrode sealing jig 19 is stacked in an inverted state, as shown in FIG. 7A and B.
It is stretched between the substrate 1 and the front plate 8 using a.
First, the structure of the electrode sealing jig 19 will be explained. The electrode sealing jig 19 includes a rectangular jig plate 20 on which the substrate 1 is positioned and mounted, and engaging pins 20a protruding from four locations on the jig substrate 20.
One and the other support rods 21, 22 that are engaged with and attached to the jig board 20, and the support rods 21,
Left and right male threaded portions 21a provided at both ends of 22,
21b, 22a, 22b, and the two electrode frames F, F are attached according to their sizes, and tension is applied to the electrode frames F, F along the longitudinal direction of the linear electrode 12. The tension members 23 and 24 on the left and right sides are generally configured. The jig board 20 has positioning pins 20b and 2 for positioning the board 1 at three locations.
0c and 20d are erected.

The left and right tension members 23 and 24 have a symmetrical shape, and each has a small hole 1 for positioning and attaching the two electrode frames F and F on the upper surface thereof.
Multiple mounting pins 25 and 26 that pass through 7 and 18
and the electrode frames F, F to the tension members 23, 24.
It has presser plates 27 and 28 for fixing to.

Furthermore, the support rods 21 and 22 are made of a material (for example,
Molded by sus304).

As shown in FIGS. 7A and 7B, a transparent or opaque insulating material such as glass is attached to both ends of the inner surface of the substrate 1 on which the anode conductor 2 is already formed using a glass adhesive (for example, fritted glass). The molded long plate-shaped spacers 29 and 30 are temporarily fixed. Then, the board 1 is placed on the jig board 20 with the spacers 29 and 30 on top, and the board 1 is placed between the three positioning pins 20b and 20.
c, position it closer to 20d. Note that the side plates 6, 6 at the upper and lower positions of the substrate 1 are bonded to the glass adhesive 4.
(See Figure 3).

Next, as shown in FIG. 6, the other electrode frame F is stacked on top of one electrode frame F in a 180° inverted state, and as shown in FIGS. Align the small hole 17 for positioning and mounting on the small hole 18 for positioning and mounting on the other side. Therefore, the short connecting portions 15 of one electrode frame F are positioned between the long connecting portions 14, 14 of the other electrode frame F such that they are alternately long and short, and the adjacent thin wire electrode portions 13 are They are arranged in parallel at constant minute intervals (half of the predetermined pitch interval P).

Next, the laminated one and the other electrode frames F,
The small holes 17 and 18 for positioning and mounting F are shown in Fig.
As shown in B, attach the mounting pin 2 to the tension members 23 and 24.
5, 26, and presser plates 27, 28.
Fix it with. In this manner, with the two electrode frames F and F stretched between the tension members 23 and 24, the support rods 21 and 22 are attached and fixed to the jig substrate 20 via the engagement pins 20a.

Subsequently, the left and right side plates 31, 31 are placed on the substrate 1 from above the electrode frame F via the glass adhesive 4, and the front plate 8 is placed on the cathode 1.
It is placed on the side plates 6, 6, 31, 31 at the four corners with the electrode frames F facing downward.

In this state, both ends of the thin wire-shaped electrode portion 13 of the electrode frame F are placed on spacers 29 and 30, as shown in FIGS. 7A and 7B and FIG. 8.
Further, as shown in FIG. 8, long connecting portions 14 and thin wire-shaped electrode portions 13 are arranged alternately between the left and right side plates 31, 31 and the substrate 1.

Next, after pressing and fixing from the top and bottom with clips, etc.
The electrode sealing jig 19 is placed in a furnace as it is and subjected to heating and baking treatment. That is, by heating, the front plate 8, the side plates 6, 6, 31, 31, the substrate 1, and the electrode frame F are fixed and hermetically sealed. After that, the exhaust is operated through the exhaust pipe H.
During this sealing process of sealing and forming a vacuum container, since the coefficient of thermal expansion of the support rods 21 and 22 is several times larger than that of the electrode frames F and F, the support rods 21 and 22 are heated. As the tube expands, both ends of the electrode frames F, F are appropriately pulled in opposite left and right directions, and sufficient tension is applied to prevent sagging during operation of the fluorescent display tube.

Therefore, the tensioned electrode frames F, F of the completed fluorescent display tube are located at the spatial position between the substrate 1 and the front plate 8 via the spacers 29, 30, as shown in FIG. 1B. As shown in FIG. 8, both a long connection part 14 and a short connection part 15 are drawn out from the outside of the stretched and formed vacuum container.

Next, each short connection part 15 of the two electrode frames F, F is cut and removed at the position of the thin wire electrode part 13, and long connection parts are arranged at a predetermined pitch interval P as shown in FIG. 1A. 14 only on the left and right side plates 31, 31
and placed outside the vacuum container. Then, terminals of external control circuits are connected to the connecting portions 14 by soldering or the like, and the frame body 16 that connects the connecting portions 14 is cut and removed.

In the fluorescent display tube manufactured in this way, as shown in FIG.
3 and the striped anode conductor 2 can form a high-density matrix, and the electrode portion 13 will not sag even during lighting, making it possible to perform a high-density graphic display without display unevenness.

Incidentally, in the above embodiment, only the control electrode is formed with a linear electrode, and an example is shown in which a striped anode conductor is formed on the inner surface of the substrate to form a matrix. It is also possible to form a matrix by forming linear electrodes on the anode conductor, and in that case, the ends of the thin wire-shaped anode conductors may be made into a wide flat shape. In addition, when changing the size of the electrode frame, it is necessary to replace the tension member,
Needless to say, this can be handled by moving the tension member relative to the support rod.

As explained above, according to the present invention, an electrode frame is made in which linear electrodes, in which flat long and short connection parts are integrally formed at both ends of a thin wire electrode part, are connected in parallel at regular intervals. Two frames are stacked so that the connection parts are alternately long and short, and tension is applied, and the connection parts and thin wire-shaped electrode parts are alternately exposed at a fixed spatial position and outside the vacuum vessel through the spacer on the substrate. After that, I selected the outer thin wire electrode part and cut it.
Various features and effects described below can be obtained.

(1) The area of the connection part of each linear electrode is much larger than that of a thin wire electrode part, and since the connection parts can be distributed to the left and right side plates, the distance between the connection parts can be widened, and the connection part and the outside can be controlled connection with the circuit,
In other words, the connection by soldering etc. becomes easy and reliable, and it is difficult to break even after connection.

(2) Since the connecting portion of each linear electrode is wider than the thin wire electrode portion, the pitch interval of the connecting portion can be set accurately without deviation.

(3) Unnecessary parts unrelated to connection with the outside are the short connection parts, which are easy to select, and the cut parts are thin wire electrode parts, which are easy to cut and remove, so they can be selectively removed. Work efficiency can be improved.

(4) Each thin wire electrode has a wide connection section, so compared to conventional thin wire electrodes, it is more uniform and can reproducibly apply sufficient tension without sagging even when the fluorescent display tube is operated. be able to.

[Brief explanation of drawings]

FIG. 1A is a plan view of an embodiment of a fluorescent display tube provided with a linear electrode by the method for manufacturing a linear electrode according to the present invention, and FIG. 2 is an explanatory diagram showing the pattern of the anode conductor formed on the inner surface of the substrate, FIG. 3 is a side view of the substrate in the direction of the arrow in FIG. 2, and FIG. 4 is an anode of the anode conductor. 5 is an explanatory diagram showing the cathode attached to the front plate, FIG. 6 is a perspective view illustrating the stacking of two electrode frames, and FIG. 7A is an explanatory diagram illustrating the stacking of two electrode frames. A plan view of the electrode sealing jig with the electrode frame attached,
FIG. 7B is a perspective view of the jig, and FIG. 8 is an explanatory diagram showing the positional relationship between the side plate, the spacer, and the two electrode frames. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Anode conductor, 6, 31... Side plate, 7... Phosphor layer, 8... Front plate, 10...
Cathode, F, F...Two electrode frames, 12...
Linear electrode as a control electrode, 13... Thin wire electrode part, 14, 15... Long and short connection parts, 17, 18
... Small hole for positioning and mounting, P ... Predetermined pitch interval of linear electrodes, W ... Formation width of connection part, 19 ... Electrode sealing jig, 20 ... Jig substrate, 21, 22 ...
Support rods, 23, 24... tension members.

Claims (1)

[Claims] 1. An electrode frame in which linear electrodes are connected in parallel at regular intervals, in which flat connecting portions are integrally formed at both ends of a thin wire electrode portion, and the length of the connecting portion is long at one end and short at the other end. a step of stacking the two electrode frames so that the lengths of the connecting portions are alternately long and short and applying tension in the longitudinal direction of the linear electrode; and a step of applying tension to the electrode frame in the longitudinal direction of the linear electrode; A step of fixing a substrate constituting a vacuum container of a fluorescent display tube so that a connecting portion and a thin wire-like electrode portion alternately protrude outside the vacuum container at a fixed spatial position via a spacer fixed to the substrate, and the vacuum container 1. A method for manufacturing a linear electrode for a fluorescent display tube, comprising the step of selecting and cutting an outer thin wire electrode portion of the electrode.