JP3058110B2 - Wiring connection structure and wiring connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring connection structure and a wiring connection method for wiring between conductors, and more particularly to a grid for a fluorescent display tube using a three-dimensional grid as a display for a car audio, VTR, measuring instrument, or the like. The present invention relates to a wiring connection structure and a wiring connection method that are optimally used for connection between the wiring and a wiring of an anode substrate.

[0002]

2. Description of the Related Art A fluorescent display tube emits electrons emitted from a cathode to a phosphor on an anode to excite the phosphor to emit light, thereby obtaining a desired display. A grid is provided between the cathode and the anode in this type of fluorescent display tube to accelerate and control electrons emitted from the cathode toward the phosphor.

When a positive voltage is applied to the grid, electrons emitted from the cathode are accelerated and diffused toward the anode.
On the other hand, when a negative voltage is applied, electrons guided to the anode are cut off to erase the display.

By the way, as a grid of such a fluorescent display tube, a grid formed of a mesh stainless steel plate is most often used. However, the configuration using the mesh grid has the following problems.

[0005] (1) The mesh grid is hollowly arranged to cover the anode while being supported by several legs. For this reason, problems such as uneven brightness due to thermal deformation at the time of driving and short-circuit due to contact with an anode or a cathode are caused.

(2) Since the mesh grid is disposed so as to cover the entire surface of the phosphor, a part of the emitted light is blocked by the frame of the grid, which causes a reduction in the amount of light and uneven brightness.

(3) When a positive voltage is applied to one of the adjacent grids and a negative voltage is applied to the other grid, a lower portion of the grid to which the negative voltage is applied is provided near the boundary between the two grids. With respect to the phosphor positioned at the position (1), electrons are attracted to the grid to which a positive voltage is applied, and some of the electrons are taken in, causing leakage light emission. For this reason,
In a portion where the display pattern is dense, it is difficult to divide the grid without causing leakage light emission.

In view of the above, a fluorescent display tube having a rib grid structure disclosed in Japanese Patent Application Laid-Open No. 8-31348 is known as a fluorescent display tube having a grid structure which solves the above problem. FIG. 3 is a plan view in which a part of the fluorescent display tube having the rib grid structure is cut away, FIG. 4 is a sectional view taken along line AA in FIG. 3, and FIG.
6 is a perspective view of a grid connection rib, and FIG. 6 is a sectional view taken along line BB of FIG.

This fluorescent display tube has a box-shaped envelope 1 whose inside is kept airtight in a high vacuum state. As shown in FIG. 3, the envelope 1 includes an anode substrate 2 having an insulating property, a flat plate (front plate) 3a having an insulating property and a light transmitting property, and a frame-shaped side face plate 3b having an insulating property. And a lid-shaped container portion 3 formed. The envelope is made of a glass substrate, and the container 3 is sealed to the outer peripheral portion of the anode substrate 2 with a sealing agent, and is evacuated and sealed to keep the inside airtight in a high vacuum state. Have been.

As shown in FIGS. 4 and 6, an anode wiring pattern 4 made of a conductive material such as Al
And the grid wiring pattern 5 are each formed in a predetermined pattern shape. On the anode substrate 2, an insulating layer 7 having through holes 6 a and 6 b is formed so as to cover the anode wiring pattern 4 and the grid wiring pattern 5.

As shown in FIG. 4, the through hole 6a is
It is formed for each segment 8a constituting the display pattern 8, and a part of the anode wiring pattern 4 is exposed. As shown in FIG. 6, the through-hole 6b is also formed at a place for electrically connecting the grid wiring conductor 11 and the grid 19, which will be described later, and a part of the grid wiring pattern 5 is exposed. ing.

As shown in FIG. 4, the through-hole 6a in which the anode wiring pattern 4 is exposed is made of a conductive material 9 such as Ag.
Has been filled in. Similarly, the through-hole 6b exposed by the grid wiring pattern 5 is also filled with a conductive material 10 such as Ag, as shown in FIG. The grid wiring conductor 11 is formed by the grid wiring pattern 5 and the conductive material 10.

As shown in FIGS. 3 and 4, a conductive material 12 such as graphite is formed in the shape of a segment 8a on a conductive material 9 filling a through hole 6a exposed by the anode wiring pattern 4. The phosphor layer 13 is formed on the conductive material 12 in the shape of the segment 8a. The anode conductor 14 is constituted by the anode wiring pattern 4 and the conductive materials 9 and 12.

As shown in FIG. 3 and FIG.
Are provided around the phosphor layer 13 made of an insulating member.
The height is formed higher than that. As a result, an anode partitioned for each segment 8a is formed. Each segment 8a is integrally connected by a rib 15 in one display pattern unit.

As shown in FIGS. 3 and 5, the ribs 15 for each display pattern 8 are connected to one segment via two leading ribs 16 integrally formed in parallel with the ribs 15 at the same height. 8a is extended out of the anode substrate 2 by a predetermined distance and is led out. The lead-out rib 16 is a lead-out rib 1
Grid connection rib 17 integrally formed at the same height as 6
Linked to Then, the rib 1 for each display pattern 8
5, on the top surfaces 15a, 16a, 17a of the lead-out ribs 16 and the grid connection ribs 17, a conductive layer 18 is formed by printing as shown in FIGS. ing.

As shown in FIG. 3, a plurality of filamentary cathodes 20 are provided above the display pattern 8 in the envelope 1 so as to face the display pattern 8. Each cathode 20 emits electrons toward the display pattern 8 by heating control.

According to the fluorescent display tube adopting the grid structure, the grid 19 can be divided at the dense portion of the display pattern 8 without causing leakage light emission, the degree of freedom of the display pattern 8 is increased, and the display pattern 8 is surely increased. Acceleration and cutoff of electrons can be controlled.

When the above-described rib grid structure is adopted in a fluorescent display tube, as shown in FIG. 6, a conductive layer 18 serving as a grid 19 is formed on the top surface 15a of the rib 15, whereas Wiring conductor 11 is insulating layer 7
Are formed on the back surface, and the heights of the two layers are different, and a step is generated.

For this reason, for example, wiring at a portion where the ribs intersect, wiring between terminals on the substrate while avoiding parts such as the cathode support, and external terminals on the substrate for connection to an external circuit. In the case of performing wiring between them, it is necessary to connect between the conductive layer 18 that becomes the grid 19 and the grid wiring conductor 11 formed on the back side of the insulating layer 7.

Therefore, as shown in FIG.
The conductive paste 21 is poured into the frame 15b of the rib 15 by a dispenser with the protrusion 17c extending from the base 6 into the frame 15 of the rib 15 serving as a guide.
The grid 19 and the grid wiring conductor 11 are electrically connected via the.

The method of forming the wiring structure will be further described. First, a frame-shaped grid connection rib 17 is formed by printing so as to surround the conductive material 10 on the grid wiring conductor 11 in the through hole 6b. At this time, the rib 15
And the lead-out rib 16 is also formed by printing. By repeating this printing and drying a plurality of times, fine and high ribs are formed vertically and accurately. Next, each rib 15, 1
A conductive layer 18 is provided on the top surfaces 15a, 16a and 17a of
Is printed as a thick film to form a grid 19. Thereafter, the inside of the frame 17b of the grid connection rib 17 is dispensed by a dispenser.
Is poured into the conductive paste 21. Thereby, the conductive paste 2 is provided between the grid 19 and the grid wiring conductor 11.
1 electrically.

[0022]

However, the above-mentioned conventional grid wiring structure has the following problems.

(1) In the case where wiring connection is performed using a dispenser, if the number of wiring connection points increases, wiring connection must be performed for each point, which takes a very long time and reduces productivity. . In addition, it is possible to jumper a plurality of points at a time by using a dispenser having a plurality of needles, but at present, the usable range is limited to, for example, 50 mm × 50 mm. Therefore, in order to perform wiring connection of all points, it was necessary to perform the operation in a plurality of times. Further, even when the dispenser head is a multi-head, the head becomes very expensive.

(2) A step of forming a grid on the top surface of the rib and a step of electrically connecting the grid and the grid wiring conductor are separately required. It takes time to finish.

(3) Since the ribs do not contribute to the display, the smaller the area, the better. However, since the projecting portion of the insulating material that guides the conductive paste to be poured into the frame covers the conductive material on the grid wiring conductor, the connection area of the conductive material with the conductive paste that is poured into the frame is reduced, and the connection failure is reduced. May be invited.

(4) Since the conductive paste is poured into the frame without protruding from the rib frame, a part of the rib is extended to a position close to the conductive material in the frame to form a protruding portion. The overall shape of the ribs is complicated and difficult to manufacture.

In view of the above, the present invention has been made in view of the above-mentioned problems, and the formation of the grid and the electrical connection between the grid and the grid wiring conductor can be reliably performed without causing a connection failure. An object of the present invention is to provide a wiring connection structure and a wiring connection method that can reduce the number of steps to reduce wiring time and reduce cost.

[0028]

In order to achieve the above object, the present invention is directed to an insulating substrate provided facing a cathode, and each segment of a display pattern formed on the substrate. A part of each anode conductor, and an insulating layer formed on the substrate with a through hole such that a part of the grid wiring conductor formed on the substrate faces each segment, and each segment of the display pattern A phosphor layer formed on the anode conductor in a shape corresponding to the above, a rib made of an insulating member printed and formed around the phosphor layer, and surrounding the grid wiring conductor facing the through hole. In a wiring connection structure comprising a frame-shaped rib made of an insulating member integrally formed on the substrate so as to be connected to the rib at the same height as the rib, a top surface of each of the ribs and the frame Condition The ribs in the frame conductive layer and wherein the printed formed integrally.

According to a second aspect of the present invention, in the wiring connection structure of the first aspect, at least a part of the grid wiring conductor is formed close to a side wall surface in the frame.

According to a third aspect of the present invention, there is provided an insulating substrate opposed to a cathode, a part of an anode conductor for each segment of a display pattern formed on the substrate, and a portion formed on the substrate. An insulating layer having a through hole is formed on the substrate such that a part of the grid wiring conductor faces each, and a phosphor layer is formed on the anode conductor in a shape corresponding to each segment of the display pattern, A rib made of an insulating member is printed and formed around the phosphor layer, and the insulating member is formed on the substrate so as to be connected to the rib at the same height as the rib so as to surround the grid wiring conductor facing the through hole. Frame-shaped ribs are formed integrally by printing, using a plate having a hole having a shape that matches the outer shape of each of the ribs,
A conductive layer is poured from the hole into the top surface of each of the ribs and into the frame of the frame-shaped rib, and is integrally formed by printing.

According to a fourth aspect of the present invention, in the wiring connection method of the third aspect, the conductive layer comprises a mixture of fine metal powder, fine powder frit glass, and a vehicle made of a gelling agent. I do.

In the present invention, the grid wiring pattern 5 having a predetermined pattern is formed on the anode substrate 2 and the through-hole 6 is formed so that the grid wiring pattern 5 faces the wiring position.
An insulating layer 7 having b is formed on the anode substrate 2. Then, the through-hole 6b is filled with a conductive material 28, and a frame-like grid connection rib 27 is printed on the insulating layer 7 so as to surround the conductive material 28 on the through-hole 6b.
The grid connection ribs 27 are integrally connected to the ribs forming the display pattern via the lead-out ribs 16 formed at the same time by printing. And the top surface 16 of each rib 16, 27
The conductive paste 17 is integrally formed by printing on the inside 27 a of the grid connection rib 27 and the inside 27 b of the grid connection rib 27. This allows
The formation of the grid 31 and the electrical connection between the grid 31 and the grid wiring conductor 29 are uniformly performed.

[0033]

FIG. 1 is a partially enlarged sectional view showing an embodiment of a fluorescent display tube to which a wiring connection structure and a wiring connection method according to the present invention are applied. FIG. 2 is a cross-sectional view of the enclosed grid connection rib, and FIG. 2 is a perspective view of the grid connection rib and the plate. 5 and 6
The same configurations as those of the conventional fluorescent display tube having a rib grid structure shown in FIG.

As shown in FIG. 3, the grid connecting rib 27 according to this embodiment is formed in a frame shape having a predetermined width and opened in a square shape, and is the same as the conventional grid connecting rib 17 shown in FIG. The projection 17c of the inside 17b of the frame is cut off.

The conductive material 28 formed on the grid wiring pattern 5 in the through hole 6b is exposed in the frame 27b of the grid connecting rib 27. The conductive material 28 is
The grid wiring pattern 5 is formed over the entire surface of the frame 27 b of the grid connection rib 27 on the anode substrate 2.
Together, they constitute a grid wiring conductor 29.

The shape of the grid connection rib 27 may be any shape as long as it is formed in an open frame shape and there is no extra protrusion in the frame 27b, and its outer shape is limited to a square shape. is not. Also, the conductive material 28 may be formed on the grid wiring pattern 5 at least partially in proximity to the side wall surface 27c of the inside 27b of the frame of the grid connection rib 27.

The top surface 15a of the rib 15, the top surface 16a of the lead-out rib 16, the top surface 27a of the grid connection rib 27, and the inside 27b of the frame are formed at the same height.
The conductive paste 30 is formed by printing.

As the conductive paste 30, for example, a particle size of 1
A mixture of a fine metal powder of Al, Ag, Au or the like having a size of μm or less, a fine powder frit glass, and a vehicle made of a gelling agent is used.

On the top surface 15a of the rib 15 for each segment 8a, a grid 31 made of a conductive paste 30 is formed. At the same time, the grid 31 and the grid wiring conductor 29 are electrically connected by the conductive paste 30. Connected.

Next, a method of manufacturing the above-configured fluorescent display tube will be described, including a wiring method between the grid 31 and the grid wiring conductor 29.

First, a conductive material 9 such as Al is patterned on the anode substrate 2 to form an anode wiring pattern 4 having a predetermined pattern shape.
Then, the grid wiring pattern 5 is formed by printing. Next, through holes 6a and 6b are formed on anode substrate 2 so as to cover anode wiring pattern 4 and grid wiring pattern 5.
The attached insulating layer 7 is formed by printing.

At this time, the insulating layer 7 is printed and formed so that the through holes 6a and 6b are located at the connection points between the segments 8a constituting the display pattern 8 and the grid 29 and the grid wiring conductor 11, respectively. .

Next, a conductive material 9 such as Ag is printed and formed in the through holes 6a of the insulating layer 7 located in each segment 8a to fill the through holes 6a. At the same time, a conductive material 28 such as Ag is printed and formed in the through hole 6b located at the wiring location between the grid 31 and the grid wiring conductor 29 to fill the through hole 6b.

In this state, the ribs 15 made of an insulating material are formed by printing with a predetermined width. As a result, an anode partitioned for each segment 8a is formed. At this time, the lead-out rib 16
The printing of the grid connection ribs 27 is also performed uniformly in the same process. Then, a conductive material 12 such as graphite is formed on the filled conductive material 9 by printing in the shape of the segment 8a, and a phosphor layer 13 is formed on the conductive material 12 by printing in the shape of the segment 8a.

Note that the ribs (ribs 15,
The printing of the derivation rib 16 and the grid connection rib 27)
Printing and drying are repeated a plurality of times because the height at which printing can be performed at one time is limited. Thereby, the rib 15 of the display pattern shape divided for each segment 8a, the derivation rib 1
6 and the grid connection ribs 27 are uniformly printed at a predetermined height.

Next, each of the ribs (the rib 15, the lead-out rib 1)
6. Hole 32 matching the shape of grid connection rib 27)
The printing of the conductive paste 30 is performed using a plate 32 having a, as shown in FIG. That is, with the hole 32a positioned at the rib forming position, the plate 32 is pressed from above by a squeegee (not shown), the squeegee is moved along the plate surface, and the conductive paste 30 is poured into the hole 32a.

Thus, the rib 1 for each segment 8a
5 on the top surface 15a of the conductive paste 30
1 is formed. At the same time, the grid 31 and the grid wiring conductor 29 are electrically connected via the conductive paste 30.

In the example of FIG. 3, the grid wiring pattern 5
Are connected to the external terminals 33 of the anode substrate 2 for each display pattern 8 through the back side of the insulating layer 7 located below the cathode support member indicated by a dashed line. The grid 31 made of the conductive paste 30 is electrically connected to the grid wiring conductor 29 via the conductive paste 30.

Here, a frame on which the filament cathode 20 is stretched is assembled in a separate step from the above operation. Then, the bottom peripheral surface of the side plate 3b in the container portion 3 is
The anode substrate 2 and the container 3 are positioned at the outer periphery of the anode substrate 2 to which the low melting point paste is applied, and the anode substrate 2 and the container 3 are pressurized from above and below. The container 1 is assembled. Thereafter, the inside of the envelope 1 is evacuated to a high vacuum state and sealed to complete the fluorescent display tube.

As described above, according to the above-described embodiment, the frame-like grid connection rib 27 is formed of an insulating member, and the top surface 27a of the grid connection rib 27 and the inside of the frame 27b are formed.
Since the conductive paste 30 is directly printed on the ribs 15, the grid 31 is formed on the ribs 15 and the grid 31 on the ribs 15 is formed.
And the grid wiring conductors 29 on the anode substrate 2 can be electrically connected all at once, so that two working steps can be completed in one step. As a result, the time required for forming and wiring the grid can be significantly reduced as compared with the conventional case, the productivity can be improved, and the processing cost can be reduced.

In the frame 27b of the grid connection rib 27 on which the conductive paste 30 is printed, there is no extra projection (projection 17c) as shown in FIG. 5, and the shape of the rib is simplified. The ribs can be easily formed by printing.

Conductive material 2 forming grid wiring conductor 11
8 is formed over the entire surface of the inside 27b of the frame of the grid connection rib 27. Accordingly, the entire surface of the conductive material 28 serves as a connection surface for wiring, and the conductive paste 30 poured into the frame 27b is naturally guided to the conductive material 28 along the side wall surface 27c of the frame 27b. A sufficient connection area is secured even with the conductive paste 30 of
1 and the connection between the grid 31 and the grid wiring conductor 29 can be uniformly performed. As a result, it is possible to realize a highly reliable wiring connection excellent in conductivity with a very low possibility of causing a connection failure.

As the conductive paste 30, a jelly-like mixture obtained by mixing fine metal powder, fine powder frit glass, and a vehicle made of a gelling agent is used. Low shear stress. Therefore, the conductive paste 30 can be easily guided to the holes 32a of the plate 32 by a squeegee to perform printing in a desired shape. Further, after printing, the conductive paste 30 can be stably held without losing its shape at the time of printing due to the viscosity of the conductive paste 30.

By the way, the wiring connection structure and the wiring connection method according to the above embodiment have been described by taking as an example a case where the invention is applied to a fluorescent display tube. Can be applied.

[0055]

As is apparent from the above description, according to the present invention, the formation of the conductive layer on the top surface of the frame-shaped rib and the electric connection between this conductive layer and the grid wiring conductor on the substrate are performed. Connections can be made uniformly, and two work processes can be completed in one process. As a result, the time required for forming and wiring the conductive layer or grid on the ribs can be significantly reduced as compared with the related art,
The productivity is improved, and the processing cost can be reduced.

Since there is no extra protrusion in the frame of the rib on which the conductive paste is printed and the shape of the rib is simplified as compared with the related art, the rib can be easily formed by printing.

The grid wiring conductor is formed at least partially in proximity to the side wall surface in the frame of the grid connection rib, and the conductive paste poured into the frame is transmitted along the side wall surface in the frame and naturally formed. And the wiring conductor, the formation of the grid and the connection between the grid and the grid wiring conductor can be performed uniformly with a sufficient connection area even with a small amount of conductive paste. Therefore, there is very little risk of inferior connection, excellent electrical conductivity, and highly reliable wiring connection can be realized.

As the conductive paste, a jelly-like mixture of fine metal powder, fine powder frit glass, and a vehicle made of a gelling agent is used, so that the shear stress of the conductive paste during printing is reduced. small. For this reason, printing of a desired shape can be easily performed, and after printing, the shape at the time of printing is lost due to the viscosity of the conductive paste, and the printing can be stably maintained.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of a fluorescent display tube to which a wiring connection structure and a wiring connection method according to the present invention are applied;

FIG. 2 is a perspective view of a grid connection rib and a plate.

FIG. 3 is a partial plan view in which a part of a fluorescent display tube having a rib grid structure is cut away.

FIG. 4 is an enlarged sectional view taken along a line AA in FIG. 3;

FIG. 5 is a perspective view of a grid connecting rib in a conventional fluorescent display tube having a rib grid structure.

FIG. 6 is an enlarged sectional view taken along the line BB in FIG. 3;

[Explanation of symbols]

2 ... Anode substrate, 4 ... Anode wiring pattern, 5 ... Grid wiring pattern, 6a, 6b ... Through hole, 7 ... Insulating layer,
8: display pattern, 8a: segment, 9, 12, 28
... Conductive material, 13 ... Phosphor layer, 14 ... Anode conductor, 15 ... Rib, 15a ... Top surface, 16 ... Derivation rib, 16a ... Top surface, 27 ... Grid connection rib, 27a ... Top surface, 27
b: inside the frame, 29: grid wiring conductor, 30: conductive paste, 31: grid, 32: plate, 32a: hole.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeo Muto 629 Oshiba, Mobara-shi, Chiba Futaba Electronics Industry Co., Ltd. 56) References JP-A-8-31348 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 31/15 H01J 9/14

Claims (4)

(57) [Claims] 1. An insulating substrate provided facing a cathode, a part of an anode conductor for each segment of a display pattern formed on the substrate, and a grid wiring formed on the substrate. An insulating layer formed on the substrate with a through hole such that a part of the conductor faces each other, and a phosphor layer formed on the anode conductor in a shape corresponding to each segment of the display pattern, A rib made of an insulating member printed around the phosphor layer, and integrated with the rib at the same height as the rib so as to surround the grid wiring conductor facing the through hole; In a wiring connection structure provided with frame-shaped ribs made of an insulating member formed by printing, a conductive layer is integrally formed on the top surface of each of the ribs and the frame of the frame-shaped ribs. Features Wiring connection structure. 2. The wiring connection structure according to claim 1, wherein at least a part of said grid wiring conductor is formed close to a side wall surface in said frame. 3. A substrate having an insulating property opposed to a cathode, a part of an anode conductor for each segment of a display pattern formed on the substrate, and a part of a grid wiring conductor formed on the substrate. Forming an insulating layer having a through-hole on the substrate so as to partially face each other, forming a phosphor layer on the anode conductor in a shape corresponding to each segment of the display pattern; A rib made of an insulating member is formed by printing on the periphery, and a frame-like frame made of an insulating member is formed on the substrate so as to be connected to the rib at the same height as the rib so as to surround the grid wiring conductor facing the through hole. The ribs are integrally formed by printing, and a conductive layer is poured from the holes into the top surface of each of the ribs and the frame of the frame-shaped rib using a plate having a hole having a shape matching the outer shape of each of the ribs. One Wiring connection method characterized by printing formed. 4. The wiring connection method according to claim 3, wherein the conductive layer comprises a mixture of fine metal powder, fine powder frit glass, and a vehicle made of a gelling agent.