JPS60216431A - Anode substrate and manufacture of the same - Google Patents

Abstract

PURPOSE:To reduce the steps of manufacturing processes, simplify the facilities and easily extract external leads by utilizing line conductors such as carbon fibers as the anode. CONSTITUTION:An anode substrate is manufactured by that the carbon fiber 2b is continuously coated with phosphor material using the carbon fiber 2b as the anode material, the carbon fibers 2b are arranged with predetermined pitch on a glass substrate 20 coated with a low melting point glass on the line and the binder made of phosphor material is baked simultaneously with fixing of carbon fibers 2b with low melting point glass. Thereby, manufacturing steps can be reduced and simplified. Moreover, a photomask which is required for photoetching is no longer necessary and therefore manufacturing steps can be reduced and facilities can also be simplified. Since a part of carbon fiber 2b is directly guided to the outside of vacuum case not illustrated as the anode lead, such lead wire can be extracted easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an anode substrate used in a dot matrix type fluorescent display tube and a method for manufacturing the same.

[Prior art]

Conventionally, the anode substrate used in this type of fluorescent display tube uses thin film technology, thick film technology, or a combination of these technologies, and is a wiring layer on a substrate such as glass.

It is manufactured by sequentially depositing an insulating layer, an anode dot pattern layer, and a phosphor layer. Conventional anode substrates manufactured using this technique have the advantage of being able to form extremely fine dot matrix patterns; and equipment required.

(2) During these steps, an interface such as an oxide film is likely to be formed on the surface of the conductor layer.

(3) Since it is a thin film or thick film substrate, leads for connecting the display tube and external circuit must be attached separately during the process of forming the display tube.

(4) This substrate is in contact with the members forming the vacuum vessel, so a thick substrate is required to prevent breakage due to external pressure and maintain important dimensions such as the gap between the grid and the cathode and the gap between the anode and the cathode. do.

There were drawbacks such as.

[Summary of the invention]

In view of the above points, the present invention has been made in order to eliminate such conventional drawbacks.By using a linear conductor such as carbon fiber as an anode, the present invention aims to reduce the manufacturing process and requires less equipment. It is an object of the present invention to provide an anode substrate and a method for manufacturing the same, which can simplify the process and allow easy removal of external leads. Hereinafter, the present invention will be explained in detail using Examples.

〔Example〕

FIG. 1 is a diagram for explaining the principle of a method of manufacturing an anode substrate according to an embodiment of the present invention. In the figure, 1 is a rotating drum on which carbon fibers 2 are wound in multiple threads (four threads in this example) as a linear conductor, and 3 is a rotating drum in which the carbon fibers 2 are drawn out from the rotating drum 1 and are placed in an electroplating tank (to be described later). An intermediate roller 4 is an electrodeposition bath for coating the entire surface of the carbon fibers 2 drawn out from the drum 1 through the intermediate roller 3, and this electrodeposition bath 4 contains fluorescent material. A roller 6 and an electrode plate 7 which guide the carbon fibers 2 from the intermediate roller 3 into the electrodeposited liquid 5 in which a light material is suspended are disposed facing each other, and these carbon ff! A predetermined voltage is applied between the carbon fibers 182 and the electrode plate 7 by a power source 8 to coat the entire surface of each carbon fiber 2 with the phosphor. In this case, the positive electrode of the power source 8 is connected to the rotating drum 1 on which the carbon fiber 2 is wound in multiple threads,
The negative electrode is connected to the electrode plate 7 in the electrodeposition bath 4 .

Reference numeral 9 denotes an intermediate roller that arranges and guides the carbon fibers 2A coated with a phosphor in the electrodeposition tank 4, and 10 a phosphor coated on the two carbon fibers guided through the intermediate row 29. This is a peeling mechanism for peeling off unnecessary portions of the phosphor. This peeling mechanism 10 is composed of a pair of metal fittings 11 and 12 that are disposed opposite to each other on both sides of the two carbon fibers, and a container 13 for storing the peeled phosphor. By moving the .12 in the direction of the arrow shown in the figure and bringing it into contact with both sides of the two carbon fibers, only the phosphor that becomes the fluorescent surface on the two carbon fibers is left for each unit length. All other phosphors on the surfaces to which the two carbon fibers are attached and the part that will become the anode lead are peeled off. 14 is the peeling mechanism 10
The carbon fibers 2B from which the phosphors of the main parts have been removed are arranged at a predetermined pitch on a glass substrate 20 coated with low melting point glass, and these carbon fibers 2B are temporarily fixed by the low melting point glass. The fixing mechanism 14 includes a plurality of presser fittings 15m and 15b.
When the glass substrate 20 coated with low-melting glass in advance is pushed out and set at the lower position of the carbon fiber 82B, the six presser metal fittings 15m and 15b are urged in the direction of the arrow shown, and these metal fittings 15a are pressed.

15b, the carbon fibers 2B are pushed into the low melting point glass on the glass substrate 20 and temporarily fixed. Note that the glass substrate 20 is pushed by an extrusion device (not shown) in the direction of the arrow shown in the temporary fixing mechanism 1.
The bubbles are pushed out sequentially to the set position of 4.

Further, 16 is a cutter mechanism consisting of a pair of cutters 17 and 18 for cutting each carbon fiber 2B temporarily fixed on the glass substrate 20 and separating each substrate, and 19 is a cutter mechanism 19 for cutting the carbon fibers 2B temporarily fixed on the glass substrate 20. The separated glass substrate 20 is transferred to a carrier (not shown) and heat-treated in an electric furnace. At the same time as the binder in the light body is burned, the low melting point glass is fired, and each carbon fiber 2B is fixed to the low melting point glass.

Therefore, when manufacturing an anode substrate, when a voltage is applied between the power source 8 and the rotating drum 1 and the electrode plate 7 in the electrodeposition tank 4, the carbon fibers 2 wound in multiple strips around the drum 1 are A potential of is applied. In this state, when each carbon fiber 2 drawn out from the rotating drum 1 is continuously fed into the electrodeposition bath 4 via the intermediate roller 3, the phosphor is electrodeposited on the entire surface of these carbon fibers 2. While being thoroughly coated, it is sent to a peeling mechanism 10 via an intermediate roller 9. At this time, in the peeling mechanism 10, the pair of metal fittings 11 and 12 are moved in the direction of the arrow shown in the figure to remove each carbon fiber 2A coated with the phosphor.
When both surfaces of the carbon fibers are brought into contact with each other, all unnecessary portions of the phosphor are removed, leaving only the phosphor that forms the fluorescent surface on each of the two carbon fibers. Then, when each carbon fiber 2B from which unnecessary portions of the fluorescent material have been removed is sent to the temporary fixing mechanism 14, this mechanism 14 moves the glass substrate 20 coated with low melting point glass to the extrusion device in the direction of the arrow shown in the figure. When extruded and set, each carbon fiber 2B is pushed into the low melting point glass on the glass substrate 20 using presser fittings 15m and 15b and temporarily fixed. Next, the glass substrate 20
The cutter mechanism 16 cuts each carbon fiber 2B temporarily fixed on the top.
After cutting and separating the glass substrate 20', the glass substrate 20 is transferred to the stain air furnace 19 by a carrier and heat-treated. As a result, the low melting point glass to which each of the carbon fibers 2B on the glass substrate 20 is temporarily fixed is fired, and at the same time, the binder in the phosphor coated on each carbon fiber 2B is burned. It is possible to manufacture an anode substrate in which a phosphor layer is continuously formed on the portion that becomes the phosphor surface of each of the carbon fibers 2B, each of which is fixed with a low melting point glass.

FIGS. 2(&) and 2(b) are a partial cross-sectional view showing the schematic structure of a fluorescent display tube using the anode substrate manufactured in this way, and a cross-sectional view taken along the line I--I. Here, 21 is an anode substrate manufactured by the method described above, and a glass substrate 2
A large number of carbon fibers 2B1 + 2B2, .
Fluorescent layers 231, 232, .
A part of ... is led out as an anode lead.

A face glass 24 forming a vacuum container is sealed on the anode substrate 21 with a low melting point glass 25. Inside this vacuum container, control bridges 261, 262 each having a structure divided in a direction (Y direction) orthogonal to the arrangement direction (X direction) of each carbon fiber 2B1, 2B2, etc. arranged on the anode substrate 21. ．． ... are arranged at a predetermined pitch, and a plurality of electron-emitting cathodes 27 are arranged above these control grids. Also, a part of each carbon fiber 2B1 r 2B2 +... fixed on the anode substrate 21 is directly led out of the vacuum container, and each control grid 261, 262,...
・And a part of the cathode 2T is connected to the face glass 24 by each of the carbon fibers 2Bl r 2B2 + ・・
... constitutes a matrix-structured fluorescent display tube. In FIG. 2, reference numeral 28 indicates a spacer glass forming a part of the face glass 24, and 29 indicates the control grids 261, 262, .・
... and a low melting point glass for sealing and supporting the cathode 27.

Such a fluorescent display tube is made of carbon fiber 21h in the X direction.
+2B2. ... and the control grid 261 in the Y direction
By selectively driving . . . 262, .
Each carbon fiber 2B1+ 2B is controlled by ゜...
Colliding with 21..., those carbon fibers 2Ih +
2B2 + phosphor layer 231 coated on...
, 232, . . . can emit light in a dot shape to display an arbitrary pattern.

In this way, according to the anode substrate of the above-described embodiment, carbon fibers are used as the anode material, the carbon fibers are continuously coated with a phosphor, and the carbon fibers are coated with low melting point glass on the line. The phosphors can be manufactured by arranging them at a predetermined pitch on a glass substrate, and simultaneously burning the binder in the phosphors and fixing the carbon fibers using low-melting glass. Therefore, the number of manufacturing steps is extremely reduced and simplified, and the photomasks, chemicals, etc. required for photoetching are no longer required, and therefore, the number of manufacturing steps is reduced and the equipment is simplified.

In addition, the anode substrate that forms part of the vacuum vessel is usually easily deflected by external pressure, and the grid, cathode, and anode
Since the gap between the cathodes varies unevenly, a relatively thick substrate is required, but according to the anode substrate of the above example, a large number of carbon fibers are attached to the tensile side of the substrate due to external pressure. Since it has a fixed structure, it is possible to use a thinner board with the same dimensions as before. Therefore, uniform light emission can be obtained, and a matrix fluorescent display tube that is thinner than conventional ones can be obtained. Furthermore, since display tubes of different sizes can be manufactured by simply changing the size of the glass substrate using the same equipment, there are fewer setup changes, and costs can be reduced. Further, since a portion of each carbon fiber on the anode substrate can be directly led out of the vacuum vessel as an anode lead, the structure for taking out the lead becomes easy. Furthermore, the rotating drum 1 and the intermediate roller 3 of the above embodiment continuously apply the fluorescent material to the carbon fibers.
Another advantage is that by simply providing an electrodeposition tank 4 for each luminescent color of the phosphor, it is possible to easily produce multiple colors.

FIGS. 3(a) and 3(b) are sectional views of main parts showing a specific example of the lead extraction structure in the above embodiment, and their ■-■
FIG. That is, when carbon fiber is used as an anode, there is a practical problem in directly soldering a part of the anode to an external circuit, for example, a printed circuit board. Therefore, in Fig. 3, a large number of carbon fibers 2B112B2 +...
A dual in-line type lead extraction structure is adopted in which these carbon fibers are taken out from both sides of the anode substrate 21 where... are arranged, and resin connectors 30 are attached to both sides of the anode substrate 21 with an adhesive 31 such as epoxy. Glue and
Each of the carbon fibers 2
By clamping a portion of Bl+ 2B2 +... to establish electrical continuity, a portion of these clip pins 32 can be attached to a printed circuit board (not shown) as an external lead. .

In this case, each clip pin 3 attached to the connector 30
Since the pitch of 2 is narrow, these clip pins 32 are arranged in a staggered manner. Further, each connector 30 has a fitting part 30a that can be fitted with a part of the anode board 21 on the side surface, and a predetermined gap is formed on the top surface of the fitting part 30a in correspondence with the holding piece 33 of each clip pin 32. A portion 30b is formed.

Therefore, with such a lead extraction structure, the display tube can be easily and reliably attached to an external circuit such as a printed circuit board.

In the case of FIG. 3, each clip pin 32 arranged on the connector 30 is used to lead out a part of each carbon fiber 2B+ + 2B2 +... on the anode substrate 21 to the outside. These clip pins 3
2 may be mounted on the printed circuit board and directly derived.

In the embodiments described above, carbon fibers that do not form an interface with the phosphor layer are used as the linear conductors of the anode, but metal wires other than carbon fibers can also be used as the linear conductors. Further, the substrate is not limited to glass, but may be metal or an insulating material such as ceramic, as long as the coefficient of thermal expansion is considered. Furthermore, the application of the low melting point glass onto the substrate may be by flat coating) or by strip coating, and it goes without saying that the present invention can be modified in many ways.

〔Effect of the invention〕

As explained above, according to the present invention, by using a linear conductor such as carbon fiber as an anode, the manufacturing process can be reduced compared to the case of manufacturing with conventional thin films, thick films, etc. In addition to this, it is also possible to simplify the equipment. In addition, since the structure has a large number of linear conductors arranged on the substrate, the influence of deflection due to external pressure on the substrate is reduced, which allows the substrate to be made thinner and provides uniform light emission. . Furthermore, since a portion of each linear conductor on the substrate can be directly led out, there are excellent effects such as ease of taking out the leads.

[Brief explanation of drawings]

FIG. 1 is a principle explanatory diagram for explaining the method for manufacturing an anode substrate according to an embodiment of the present invention, and FIGS. 2(a) and (
b) is a partial sectional view showing the schematic structure of a fluorescent display tube using the anode substrate manufactured according to the above example, and its sectional view taken along the line I-I; FIG. 2 is a sectional view of a main part showing a specific example of a lead extraction structure in an embodiment, and a sectional view thereof taken along the line ■-■. 1...Rotating drum, 2 + 2B1+ 2B2 +
- Carbon fiber (linear conductor), 3... Intermediate roller, 4... Electrodeposition bath, 5... Electrodeposition liquid, 6...
・Roller, 1... O electrode plate, 8... Power supply, 9...
- Intermediate roller, 10... Peeling mechanism, 14... Temporary fixing mechanism, 16... Cutter mechanism, 19... Electric furnace, 20... Glass substrate, 21... anode substrate,
22...Low melting point glass, 231,232,"...
Fluorescent layer, 24...Face glass, 25...
φ low melting point glass, 261,262. ...Control grid, 27...Cathode. Patent Applicant Ise Electronics Co., Ltd. Agent Kazuki Yamakawa (and 2 others) 15- No. 2 (0) No. 3 (G) ■j (b) 4 Figure (b)

Claims (2)

[Claims] (1) Linear conductors such as carbon fibers are arranged at a predetermined pitch as anodes on a substrate such as glass, and
An anode substrate characterized in that a fluorescent material is continuously coated on the surface of these linear conductors, and a portion of each linear conductor is taken out as an anode lead. (2) A step of continuously applying a fluorescent material to the entire surface of a linear conductor such as carbon fiber, and a step of applying fluorescent material to unnecessary parts of the fluorescent material applied to the linear conductor in this step. a step of peeling off only the body, a step of arranging the linear conductors at a predetermined pitch on a substrate coated with low melting point glass in advance, and temporarily fixing these linear conductors to the low melting point glass; and a step of temporarily fixing the linear conductors to the low melting point glass. A step of cutting each of the linear conductors temporarily fixed onto each substrate, and a step of burning the binder in the phosphor applied to each of the linear conductors and simultaneously firing the low melting point glass to cut each of the linear conductors into pieces. 1. A method for manufacturing an anode substrate, comprising the step of fixing a conductor on the substrate.