KR100306969B1 - Fluorescent display device and method for manufacturing same - Google Patents

Abstract

(Problem) Absorbs the height deviation of the reinforcement support without using the low melting point paste on the front plate side.

(Solution means) A low melting point paste 13 is applied to the outer circumference of the base substrate 2 on which the anode 8 forming the display pattern is formed, and the support post for reinforcement is located in a place where the anode 8 on the base substrate 2 is avoided. (11) The low melting paste 12 for arranging installation is apply | coated and plasticized. The fixing paste 14 is applied onto the low melting point paste 12, and the reinforcing support 11 is placed on the fixing paste 14, and the fixing paste 14 is fired and solidified. In the low-melting-point paste 12 in which the lid-shaped container part 5 was pressed up and down while facing the base substrate 2, and the fixing paste 14 to which the reinforcing support 11 was fixed was dissolved. It sinks and seals the container part 5 in the outer peripheral part of the base substrate 2, and forms the envelope 1, and makes the base substrate 2 press-contact the reinforcement support 11 to the inner surface of the front plate 3. Between the front and front panel (3).

Description

Fluorescent display tube and its manufacturing method {FLUORESCENT DISPLAY DEVICE AND METHOD FOR MANUFACTURING SAME}

The present invention relates to a fluorescent display tube having a reinforcing support for preventing deformation of the enclosure in which the inside is hermetically maintained in a high vacuum state by atmospheric pressure from the outside, and a manufacturing method thereof.

(Conventional technology)

A typical fluorescent display tube has a lid-shaped container portion formed of a front plate and a frame-shaped side plate on a base substrate, and has a box-shaped envelope that is hermetically maintained in a high vacuum state. Inside the envelope, an anode having a phosphor is formed on the surface of the base substrate, a control electrode is provided above the anode, and a plurality of filamentary cathodes emitting electrons are provided above the control electrode.

In the fluorescent display tube configured as described above, when the filamentary cathode is heated to emit electrons from the cathode, the electrons are accelerated and controlled by the control electrode so that they are dead at the anode. This causes the phosphor to excite and emit the desired display.

By the way, this type of fluorescent display tube has a structure in which a space between the base substrate and the front plate is fixed only to the outer periphery by a frame-shaped side plate, and each substrate (base substrate, front plate, side plate) constituting the envelope is formed. The thickness of the plate is somewhat thickened to gain strength. Specifically, in the conventional fluorescent display tube, the thickness of each substrate is set to 3.5 mm.

However, only by thickening the plate thickness of each board | substrate which comprises an envelope, atmospheric pressure is applied to the wall surface of a base board and a front plate externally, and when used for a long time, a board | substrate will arise and it cannot fully endure external pressure. For this reason, the structure which supports the support board between board | substrates, ie, between a base board and a front plate, is arrange | positioned at several places in an enclosure.

3 is a side cross-sectional view of a conventional fluorescent display tube in which reinforcing pillars are arranged. In Fig. 3, the reinforcement struts 31 are arranged in two positions on the left and right on the base substrate 34 in the envelope 33 so as not to obstruct the display pattern. The reinforcement support 31 is formed in a quadrangular columnar shape, one end surface 31a is fixed to the base substrate 34 by the fixing paste 35, and the other end surface 31b is a low melting point paste ( 36) is fixed to the front plate 37. As the fixing paste 35, the paste for attaching the inside of the control electrode 38 applied to the base substrate 34 is also used. The low melting point paste 36 is applied in advance to the other end surface 31b of the reinforcing support 31.

In manufacturing a fluorescent display tube in which the reinforcement pillars 31 are arranged, the low melting paste 36 is coated on one side of a thin sheet of paper, which is pivoted, and fired, and cut at predetermined intervals (for example, 4 mm). Accordingly, a plurality of quadrangular pillar-shaped reinforcement struts 31 having the low melting point paste 36 coated on the other end surface 31b are created.

In the case of the assembly, one end face 31a of the reinforcing support 31 is placed on the fixing paste 35 applied to the base substrate 34, and then fired and solidified. As a result, one end surface 31a of the reinforcing support 31 is fixed on the base substrate 34. Next, the lid-shaped container part 39 is arrange | positioned on the base substrate 34, and it heats by applying a pressure up and down. As a result, the low melting point paste 40 applied to the base substrate 34 and the low melting point paste 36 applied to the reinforcing support 31 are melted. When the low melting point pastes 40 and 36 are cooled and hardened, the outer circumferential portion of the base substrate 34 and the container portion 39 are fixed to each other, and the other end surface 31b of the reinforcing support 31 is completely covered. It is fixed to the plate 37.

As described above, in the conventional fluorescent display tube, the low melting point paste 36 is applied to the contact surface (the other end surface 31b) of the front plate 37 in the reinforcement strut 31, and the front plate 37 is applied. The height variation of the reinforcement strut 31 at the time of fixation is absorbed by the molten low melting point paste 36.

(Tasks to be solved by the invention)

However, the above-described conventional fluorescent display tube provided with a reinforcing support has a problem as shown below.

(1) Reinforcement struts 31 arranged at two right and left positions of the base substrate 34 in the envelope 33 and arranged at two right and left positions of the base substrate 34. Since it is a structure which preserves furnace intensity | strength, it must enlarge to the dimension of the grade which can support the reinforcement strut 31 independence. Specifically, it is set to about 4 mm x 1.8 mm in width and about 5.4 mm in height. For this reason, when viewing a display from the front plate 37 side, a viewing angle becomes narrow and it is hard to see.

(2) Since the reinforcement strut 31 is formed of a glass substrate having the same light transmittance as that of the respective substrates constituting the envelope 33, the display pattern is not leaked to the side or affected by reflection so that the display is not easily seen. do.

(3) Although the reinforcement support 31 is fixed to the front plate 37 by the low melting point paste 36, the low melting point paste 36 melted at the time of fixation is the other end surface of the support post 31 for reinforcement. Since it penetrates and extends from the periphery of 31b, the viewing angle at the time of observing a display from the front plate 37 side becomes narrow and it is difficult to see.

(4) Since the reinforcement strut 31 arrange | positioned in the envelope 33 is made into a small number, and the board thickness of each board | substrate which comprises the envelope 33 is thickened, the total weight becomes heavy. Specifically, the plate thickness of each of the base substrate 34, the front plate 37, and the side plate 41 is 3.5 mm, and the weight of a 60 mm x 220 mm fluorescent display tube is 270 g.

(5) Since the reinforcing support 31 has a surface (the other end surface 31b) to which the low melting point paste 36 is applied, and an uncoated surface (one end surface 31a), etc., these surfaces are distinguished. Since the process is necessary, it is difficult to automatically align the plurality of reinforcement struts 31 by vibration.

(6) Since the low-melting-point paste 36 is apply | coated to one surface (other end surface 31b) of the reinforcement support 31 by a separate process of creating a reinforcement support, the cost per one support becomes high.

When the low melting point paste 36 applied to the reinforcing support 31 is deleted in order to solve the above problems, reinforcing support which does not come into contact with the front plate 37 occurs due to the deviation of the height of the reinforcement support. Then, there is a problem of not functioning as a reinforcing support post.

In addition, when the thickness and weight of the fluorescent display tube are to be reduced, the number of the reinforcing pillars 31 is insufficient in the conventional fluorescent display tube described above and does not sufficiently endure the external pressure. In this case, it is necessary to arrange the plurality of reinforcing pillars 31 on the base substrate 34 to avoid the position of the display pattern, that is, the anode 32. To this end, the reinforcing support 31 may be made sufficiently small. However, the reinforcing support 31 used in the conventional fluorescent display tube has a low melting point paste 36 on one surface (the other end surface 31b). Since it is applied, it bears to align on the base substrate 2.

Therefore, the present invention has been made in view of the above problems, and it is possible to absorb the height deviation of the reinforcement struts by arranging the reinforcement struts securely in contact with the front plate without using a low melting point paste on the front plate side. It is an object of the present invention to provide a fluorescent display tube and a method for manufacturing the same, which can observe a display without narrowing the viewing angle, and can reduce the thickness, light weight, work efficiency, and cost.

(Means to solve the task)

In order to achieve the above object, the invention of claim 1 includes a box-shaped envelope in which a lid-shaped container portion formed of a front plate and a frame-shaped side plate is sealed at an outer circumference of a base substrate on which an anode forming a display pattern is formed. In the fluorescent display tube, at a location where the anode in the envelope is avoided, a low melting point paste having one end face in contact with the inner face of the front plate and the other end face being applied on the base substrate and the low melting point paste And a reinforcing supporter fixed on the base substrate through a fixing paste containing, as a main component, the crystallized frit glass that is not remelted.

The invention of claim 2 is characterized in that in the fluorescent display tube of claim 1, the support pillar is made by mixing a black pigment with a glass material.

According to the invention of claim 3, a low melting paste is applied to the outer circumference of the base substrate on which the anode constituting the display pattern is formed, and a low melting paste for arranging the reinforcing struts is applied to a location which avoids the anode on the base substrate. And a fixing paste containing, as a main component, crystallized frit glass that is not remelted on a low melting point paste applied to a location away from the anode on the base substrate, and standing the reinforcing supporter on the fixing paste. By firing and fixing the fixing paste, and pressing and heating the lid-shaped container part of the front plate and the frame-shaped side plate in the state facing the base substrate and heating the upper and lower portions. A wear paste is settled in the low melting paste so that the outer periphery of the base substrate And sealing the container portion to form the envelope, is brought into contact with the pressure for holding the reinforcement on an inner surface of the face plate characterized in that the fixedly installed between the base plate and the front plate.

1 is a side cross-sectional view showing an embodiment of a fluorescent display tube according to the present invention;

FIG. 2 is a view showing a manufacturing process of arranging reinforcing pillars of the fluorescent display tubes (a) to (e);

3 is a side cross-sectional view of a fluorescent display tube with a conventional reinforcing supporter;

"Description of Symbols for Major Parts of Drawings"

1: Envelope 2: Base board 3: Front panel

4: side plate 5: container 8: anode

11: Reinforcement post 12: Low melting point paste 14: Pasting paste

(Embodiment of invention)

1 is a side cross-sectional view showing an embodiment of a fluorescent display tube according to the present invention.

The fluorescent display tube has an enclosure 1 in which the inside is hermetically sealed in a high vacuum state, and has a structure in which various electrodes and the like are housed therein.

The envelope 1 includes a base substrate 2 made of a glass substrate, a front plate 3, and a frame-shaped side plate 4, respectively. The envelope 1 forms a lid-shaped container portion 5 by means of an insulating and translucent front plate 3 and an insulating frame-shaped side plate 4, and an insulating base substrate 2 By enclosing the container portion 5 with the sealant on the outer circumference of the c), the inside is exhausted in a high vacuum state and hermetically maintained.

An anode conductor 6 made of Al or the like is formed on the inner surface of the base substrate 2, and a phosphor layer 7 is deposited on the anode conductor 6, and a predetermined patterned anode 8, which is individually divided, is formed. Forming. A mesh-shaped control electrode 9 is provided above the anode 8, for example, and a filament-shaped cathode 10 is provided above the control electrode 9. The filament-shaped cathode 10 emits electrons by heating, and the control electrode 9 accelerates and controls the electrons emitted from the filament-shaped cathode 10 toward the anode 8 forming a display pattern.

On the base substrate 2 in the envelope 1, quadrilateral columnar thin reinforcement struts 11 are arranged in a plurality of places. Each reinforcing sheet 11 is fixedly installed between the base board 2 and the front plate 3 while being in pressure contact with the front plate 3 to avoid the anode 8 forming the display pattern so as not to obstruct the display. do. Specifically, in the case of manufacturing a 60 mm x 220 mm fluorescent display tube, 34 reinforcing paper columns 11 are arranged.

The reinforcing support column 11 is formed slightly higher than the height of the side plate 4, and the outer dimension is set smaller than the conventional one. As a specific external dimension, it is set to width 1mm x 1mm, and height 4.4mm. The reinforcement holding column 11 is not limited to a quadrangular columnar shape, but may be a shape such as other polygonal columnar shapes or columnar shapes.

The reinforcing support column 11 is press-molded by mixing black pigment with glass material, for example. Accordingly, the reinforcing sheet 11 is formed in the same color as the background of the base substrate 2, and when the display is observed from the front plate 3 side, each reinforcing sheet 11 is the base substrate. We are buried in background of (2) and are not outstanding. In addition, since the light emission of the display pattern is not leaked from the side surface or affected by reflection, the display is easier to see than the conventional fluorescent display tube shown in FIG. 3 and has excellent visibility.

The low melting point paste 12 as a fixing agent is applied to the position where the reinforcing sheet 11 on the base substrate 2 is arranged. The low melting point paste 12 applies the low melting point paste 13 to the outer peripheral portion of the base substrate 2 when the container portion 5 is fixed to the base substrate 2 to form the envelope 1. Is done with.

As the low melting point paste 12, one having a softening point of 380 ° C. containing frit glass as a main component is used.

On the low melting paste 12, a fixing paste 14 for fixing the one end surface 11a of the reinforcing sheet 11 is applied. The fixing paste 14 is carried out together with the application of the paste for attaching the paste for fixing the control electrode 9 to the base substrate 2. The fixing paste 14 mainly contains crystallized frit glass which does not remelt once solidified. The same fastening paste is also used for the fastening paste of the control electrode 9.

Each reinforcing sheet 11 is fixed on the fixing paste 14 through the low melting point paste 12 having one end face 11a fixed to the base substrate 2, and the other end face 11b being the front plate. It is fixed between the base substrate 2 and the front plate 3 in the state of being in pressure contact with the inner surface of (3), and supports between the base substrate 2 and the front plate 3. This prevents the envelope 1 from being deformed by atmospheric pressure from the outside.

Next, the manufacturing method of the fluorescent display tube by the said structure is demonstrated. First, an anode 8 partitioned into a predetermined shape forming a display pattern is formed on the base substrate 2. More specifically, although not specifically illustrated, wiring is formed by patterning Al on the base substrate 2, and an insulating layer with through holes is printed on the base substrate 2. The through hole of the insulating layer is filled with an Ag paste to form an anode conductor 6 on the through hole, and a phosphor layer 7 is printed on the anode conductor 6.

Next, a low melting paste 13 is applied to the outer circumference of the base substrate 2 on which the anode 8 is formed. At this time, the low-melting-point paste 12 is also applied to the place where the reinforcing sheet 11 on the base substrate 2 is arranged, and the low-melting-point pastes 12 and 13 are plasticized (Fig. 2 (a)). Subsequently, a paste for attaching the paste for fixing the control electrode 9 to the base substrate 2 is applied onto the base substrate 2. At this time, the paste for pasting is used as the fixing paste 14, and is applied together on the low melting point paste 12 in which the reinforcing sheet 11 is arranged (Fig. 2 (b)).

Next, the control electrode 9 is placed on the inner paste, and the control electrode 9 is fixed to the base substrate 2. Subsequently, one end surface 11a of the reinforcing sheet 11 is placed on the fixing paste 14, and the reinforcing sheet 11 is mounted on the fixing paste 14 to be temporarily fixed. (c)). An automatic alignment device (not shown) is used to mount the reinforcing support column 11 onto the fixing paste 14. In the automatic sorter, a plurality of reinforcing supporters 11 are distributed in accordance with the arrangement position by vibration, and automatic sorting is performed in unison. Thereafter, the fixing paste 14 is baked and solidified. Accordingly, one end surface 11a of each reinforcing sheet 11 is fixed on the fixing paste 14.

Here, in a separate process from the above work, the frame in which the filament-shaped cathode 10 is provided is tightened. Then, the bottom circumferential surface of the side plate 4 in the container portion 5 is positioned at the outer circumference of the coated base substrate 2 of the low melting point paste 13 (Fig. 2 (d)), and the base substrate ( 2) and the container portion 5 are pressed up and down to seal the outer periphery of the base substrate 2 and the container portion 5 to assemble the envelope 1 (Fig. 2 (e)).

Here, in the assembling operation of the envelope 1, the tapered reinforcing sheet 11 is fixed to the fixing paste 14 solidified on the lower surface (the other end surface 11b), and the base substrate 2 ) And the container portion 5 by applying a force up and down, the fixing paste 14 sinks in the low melting point paste 12 melted by the pressing force of the front plate 3 (Fig. 2 (e)). . As a result, the height deviation of the reinforcing sheet 11 is absorbed.

Thereafter, the inside of the enclosure 1 is evacuated and sealed in a high vacuum state, thereby completing the fluorescent display tube.

As described above, according to the fluorescent display tube of the above embodiment, the reinforcement support 11 fixed to the fixing paste 14 solidified on the base substrate 2 is melted at the time of firing when the envelope 1 is assembled. It is pushed into the low melting paste 12.

Therefore, without applying the low melting point paste to the surface of the front plate 3 side of the reinforcing sheet 11 as before, the height variation of the reinforcing sheet 11 is applied to the base substrate 2 side. It can be absorbed by the melting point paste 12, and can be fixedly installed between the base substrate 2 and the front plate 3 in a state in which each reinforcing sheet 11 is firmly in contact with the front plate 3. have.

Since the reinforcement holding column 11 as a component does not need to be distinguished from the upper and lower sides as in the prior art, it can be automatically aligned at the same time by the automatic sorter.

Each reinforcement column 11 has a thinner outer dimension than the conventional one, and a low melting point paste is not used between the reinforcement column 11 and the front plate 3, so that the low melting point paste is drooped as in the prior art. The restriction of the viewing angle due to this can be reduced as compared with the conventional fluorescent display tube shown in FIG.

The reinforcing support column 11 is made of only a glass material, and since it is not necessary to apply a low melting point paste to one surface in advance as in the prior art, the cost can be reduced.

Since the reinforcing column 11 is formed in the same color as the background of the base substrate 2, when the display is observed from the front plate 3 side, each reinforcing column 11 is the base substrate 2. Buried in the background of the inconspicuous. In addition, it is possible to provide a fluorescent display tube that is easier to see and has better visibility than the conventional fluorescent display tube shown in FIG. 3 without the light emission of the display pattern leaking to the side or affected by reflection.

Since a plurality of reinforcing paper columns 11 having a smaller external dimension than the related art are arranged in the enclosure 1, the fluorescent display tube can be thinner and lighter than the conventional one. Specifically, in the case of manufacturing a 60 mm x 220 mm fluorescent display tube, the reinforcing sheet arranged in the envelope 1 has a width of 4 mm x 1.8 mm, a height of 5.4 mm, a width of 1 mm x 1 mm, and a height of 4.4 mm. Becomes smaller.

As a result, the plate thickness of each substrate (base substrate 2, front plate 3, side plate 4) constituting the envelope 1 becomes thinner from conventional 3.5 mm to 1.8 mm, and the side plate. The height of 4 is also lowered from 5.2 mm to 4 mm. As a result, the weight of the fluorescent display tube can be reduced from 270 g to 150 g.

Further, the height of the side plate 4 is lowered, and the thickness of the base board 2 and the front plate 3 is thinner, so that the vertical viewing angle is wider than that of the conventional fluorescent display tube.

As will be apparent from the above description, according to the present invention, it is possible to absorb the height deviation of the reinforcing supporters without applying the low melting point paste to the surface of the front plate side of the reinforcing paper holders as in the related art. Can be fixedly installed between the base board and the front plate in a state where the front panel is firmly in contact with the front panel.

Since the reinforcement paper as a part does not require the distinction between the upper and lower sides as in the prior art, it can be automatically aligned at the same time by the automatic sorter.

Since the low melting point paste is not used between the reinforcing sheet and the front plate, even if the outer dimension of the reinforcing sheet is thinner than before, the viewing angle is limited less than that of the conventional fluorescent display tube. can do.

In addition, by providing a plurality of reinforcing pillars arranged in the enclosure and thinner than conventional ones, the thickness and weight of the fluorescent display tube can be reduced.

Since the reinforcing sheet is formed of only a glass material, and there is no need to apply a low melting point paste on one side in advance as in the prior art, cost reduction can be achieved.

Since the reinforcing sheet is formed in the same color as the background of the base board, each reinforcing sheet is buried in the background of the base board when the display is observed from the front plate side.

In addition, it is possible to provide a fluorescent display tube which is easy to see and is easier to see than the conventional fluorescent display tube without being emitted from the side surface or affected by reflection.

Claims (3)

The outer periphery of the base substrate on which the anode constituting the display pattern is formed is provided with a box-shaped envelope in which a lid-shaped container portion formed of a front plate and a frame-shaped side plate is sealed, and a reinforcement is provided at a location avoiding the anode in the envelope. In a fluorescent display tube in which one end surface of the prop is in contact with the inner surface of the front plate and the other end is fixed on the base substrate, The reinforcing sheet is composed of a paste composed mainly of a low melting point frit glass coated on the base substrate of the other end surface (hereinafter referred to as a "low melting point paste") and a non-remelted crystallized frit glass applied to the low melting point paste. The fluorescent display tube is fixed on the base substrate through a fixing paste containing a main component. The fluorescent display tube according to claim 1, wherein the reinforcing sheet is formed by mixing black pigment of glass material. The outer periphery of the base substrate on which the anode constituting the display pattern is formed is provided with a box-shaped envelope in which a lid-shaped container portion formed of a front plate and a frame-shaped side plate is sealed, and a reinforcement is provided at a location avoiding the anode in the envelope. In the manufacturing method of the fluorescent display tube in which one end surface of the prop is in contact with the inner surface of the front plate and the other end is fixed on the base substrate, A low melting paste is applied to the outer circumference of the base substrate on which the anode constituting the display pattern is formed, and a low melting paste for arranging the reinforcing sheet is applied to the portion avoiding the anode on the base substrate to plasticize the base substrate. A fixing paste containing a crystallized frit glass which is not remelted on a low melting point paste applied to a location where the anode is avoided on the top is applied, and the reinforcing sheet is placed on the fixing paste to form the fixing paste. Firing and solidifying, pressurizing and heating the lid-shaped container part made up of the front plate and the frame-shaped side plate up and down in a state of facing the base substrate and heating the fixing paste to which the reinforcing sheet is fixed; It sinks in the middle and seals the said container part to the outer peripheral part of the said base substrate. To form an envelope, and the reinforcing sheet is pressed against the inner surface of the front plate and fixedly installed between the base substrate and the front plate.

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