JPH10214564A - Manufacture of image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance manufacturing efficiency, reduce the thickness of an adhesive resin layer and suppress peeling-off by allowing one side of a front panel to abut against one side having a greater thickness of the adhesive resin layer which is applied to a flat panel in such a manner that one side becomes thicker with inclination of the flat panel in the state in which the front panel is inclined with respect to the flat panel, followed by overlapping with each other, and by hardening the resin layer. SOLUTION: A reinforcing band 10 slightly projecting from a flat panel face 22 can prevent an adhesive resin 13 from flowing out and facilitate positioning of a front panel 8. The adhesive resin 13 having a predetermined viscosity is applied, with movement of nozzles, to the inclined flat panel face 22 of a bulb 11 placed on support mounts 52a, 52b which are different in height from a horizontal level 50. The thickness of the adhesive resin 13 is different on both short sides. After being left for a short time, the front panel 8 inclined at an angle α of 10-20 deg. with respect to the flat panel face 22 abuts on one side 8e thereof against the other side having a greater thickness of the adhesive resin 13, and then, gradually falls by pressing, so that the adhesive resin 13 is hardened by an ultraviolet ray. With this constitution, bubbles is difficult to be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an image display device in which an image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel.

[0002]

2. Description of the Related Art Examples of this type of image display device include a cathode ray tube, a liquid crystal panel, and a plasma display. Normally, a cathode ray tube has a curved image display surface. In particular, a computer display such as a computer display having a flat image display surface has been developed for the purpose of displaying an image with high resolution and little distortion over the entire screen. The front panel, which is overlaid on the flat panel via the adhesive resin layer, not only has the function of reinforcing the image display surface, but also has the function of preventing reflection of external light and the function of preventing charging. Many.

Conventionally, a multilayer structure of a flat panel, an adhesive resin layer, and a front panel constituting an image display surface has been realized by the following manufacturing method. That is, a spacer is arranged around the periphery of the flat panel, and the front panel is placed from above. In this state, the gap between the outer periphery of the flat panel and the front panel is closed with a resin tape and a high-viscosity sealing resin. Then, a low-viscosity adhesive resin is injected from an opening provided in a part to fill a gap between the image display surface and the front panel. After this,
By curing the adhesive resin, a multilayer structure including a flat panel, an adhesive resin layer, and a front panel is formed (for example, see Japanese Patent Application Laid-Open No. 6-20598).

[0004]

However, the above-mentioned conventional manufacturing method has the following problems, and improvements have been demanded. First, in a method of closing (sealing) a peripheral gap between the flat panel and the front panel with a high-viscosity sealing resin, a resin curing step by ultraviolet light or heating, which usually takes about 30 to 90 minutes, involves bonding with the sealing resin. It is required twice for the resin.

On the other hand, in a method of sealing the gap between the flat panel and the front panel at the peripheral portion with a resin tape, the sealing may be incomplete and the injected adhesive resin may leak from the gap before curing.

Further, common problems are that it takes time to inject the adhesive resin into a narrow gap between the flat panel and the front panel, that air bubbles are easily generated in the adhesive resin layer,
There are many problems in terms of production efficiency, such as the necessity of strictly controlling the viscosity of the resin so that the resin reaches the periphery sufficiently.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its object is to provide a flat panel, an adhesive resin layer, and a front panel on an image display surface of an image display device. It is an object of the present invention to provide a method of manufacturing an image display device in which a multilayer structure can be formed efficiently and quality defects such as peeling by an adhesive resin are less likely to occur.

[0008]

A method of manufacturing an image display device according to the present invention is a method of manufacturing an image display device in which an image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel. Forming the adhesive resin layer on the surface of the flat panel, and contacting one side of the front panel with the adhesive resin layer and tilting the front panel with respect to the flat panel. A step of stacking a front panel on the flat panel, and a step of curing the adhesive resin layer after the front panel is stacked on the adhesive resin layer, and a step of forming the adhesive resin layer,
Means for applying the adhesive resin to the surface of the flat panel, and the flat panel so that the layer thickness of the adhesive resin applied to the surface of the flat panel is thinner on one side of the front panel than on one side. Tilting means for tilting.

According to this method of manufacturing an image display device, the adhesive resin is injected before the front panel is overlaid on the adhesive resin layer, so that the peripheral portion of the flat panel can be sufficiently introduced without strictly controlling the viscosity of the adhesive resin. As the adhesive resin spreads,
The injection time of the adhesive resin is reduced. Further, the resin curing process is shortened to only one time using only the adhesive resin, and further, in the step of forming the adhesive resin, the thickness of the adhesive resin on the side opposite to the layer thickness of the adhesive resin on the side where one side of the front panel is brought into contact. Since the layer thickness is reduced, bubbles are less likely to be generated between the panels.

[0010] The method of manufacturing an image display device according to the present invention is a method of manufacturing an image display device, wherein the image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel. A step of forming the adhesive resin layer on the surface of the panel, a step of overlapping the front panel on the adhesive resin layer formed on the surface of the flat panel, and after the front panel is overlaid on the adhesive resin layer, Curing the adhesive resin layer, wherein the step of laminating the front panel is such that one side of the front panel is in contact with the adhesive resin layer and the front panel is inclined with respect to the flat panel. Then, the front panel is rotated in a direction in which the inclination becomes smaller around a contact portion between the front panel and the adhesive resin layer, and the front panel and the adhesive resin layer are rotated. Contact distance of, holds the front panel until 1 / 2-3 / 4 of the front panel width of the contact distance direction.

According to this method of manufacturing an image display device, the front panel is connected until the contact distance between the front panel and the adhesive resin layer becomes 1/2 to 3/4 of the front panel width in the contact distance direction. , Air bubbles are less likely to be generated between the panels.

Further, the method of manufacturing an image display device according to the present invention is a method of manufacturing an image display device, wherein the image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel. A step of forming the adhesive resin layer on the surface of the panel, a step of overlapping the front panel on the adhesive resin layer formed on the surface of the flat panel, and after the front panel is overlaid on the adhesive resin layer, Curing the adhesive resin layer, wherein the step of forming the adhesive resin layer on the surface of the flat panel and the step of stacking the front panel are simultaneously performed in an interlocked manner.

According to this method of manufacturing an image display device, the step of forming the adhesive resin layer on the surface of the flat panel and the step of stacking the front panel are performed simultaneously and simultaneously, so that the manufacturing time is reduced, In addition, entry of foreign matter and the like can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a cathode ray tube will be described below with reference to the drawings.

First, the structural features of the cathode ray tube of the present embodiment will be described. As shown in FIG. 1, the cathode ray tube according to the present embodiment is provided with a bulb 11 having a flat panel portion whose image display surface is made of a flat glass material, and is provided inside the bulb so as to face the inner surface of the image display surface. Flat shadow mask 5 and reinforcing band 1 fixed to the outer periphery of flat panel portion 3
0.

The bulb 11 includes, in addition to the flat panel section 3, a neck section 2 containing an electron gun, and a funnel section 1 made of a glass material and extending therefrom and connected to the flat panel section 3.
And The flat panel portion 3 is not a simple flat plate, but has a wall portion 9 made of a glass material integrally formed with the flat panel portion 3. The wall portion 9 extends substantially perpendicularly from the periphery of the flat panel portion 3 and is adhered to the funnel portion 1 with the glass adhesive 4.

The strength of the valve 11 is improved by the wall portion 9. That is, when there is no wall portion 9 and the peripheral portion of the flat panel portion 3 is directly bonded to the funnel portion 1, when a pressure is vertically applied to the flat panel portion 3, a strong stress is applied to the bonded portion or its vicinity. Occurs, and the valve 11 is easily broken from this portion. On the other hand, in the case of the structure shown in FIG. 1, the wall portion 9 absorbs such stress, and therefore is not easily broken. The mechanical strength against external force is further strengthened by a reinforcing band 10 fixed to the outer periphery of the wall portion 9.

The shadow mask 5 is supported in a state where a tensile stress is applied to the frame 6, and the frame 6
It is detachably mounted on the inner surface of the wall portion 9 by a mask spring 12 provided at the location. FIG. 2 is a partially cutaway perspective view of the frame 6 and the shadow mask 5 stretched over the frame.

As described above, the reason why the tensile stress is applied to the shadow mask 5 is that the shadow mask 5 is operated during the operation.
This is to maintain the flatness of the shadow mask 5 even if the temperature of the mask becomes high and thermal expansion occurs. Normal,
During operation, the temperature of the shadow mask 5 rises to about 100 ° C. due to collision of an electron beam from an electron gun. Therefore, the magnitude of the tensile stress given to the shadow mask 5 in advance is adjusted to such an extent that the flatness does not collapse even at such a temperature. For example, 5-50 kg /
A tensile stress of mm ² is applied.

As shown in FIG. 1, a phosphor screen 7 for color display is formed on the inner surface of the flat panel section 3. The planar shadow mask 5 is opposed to the phosphor screen 7, and both are arranged substantially in parallel.
The distance between the planar shadow mask 5 and the phosphor screen 7 is adjusted within a range of about 2 mm to 30 mm. The frame 6 supporting the shadow mask 5 is a mask spring 1
By being detachably attached to the inner surface of the glass wall portion 9 via the second member 2, the phosphor screen 7 can be formed efficiently. That is, operations such as fixing and cleaning after irradiating the phosphor through the shadow mask 5 can be performed with the shadow mask 5 removed.

Since the planar shadow mask 5 can be made thinner than a curved shadow mask, the pitch of apertures formed in the shadow mask 5 can be narrowed, and as a result, high resolution can be realized. Is done. For example, the thickness of the shadow mask 5 is 0.02 mm, the aperture pitch is 0.25 mm, and the aperture diameter is 0.1 m.
m.

The flat panel portion 3 has a substantially uniform thickness at a portion where the phosphor screen 7 is formed on the inner surface. This prevents a difference in the optical characteristics of the flat panel portion 3 between the central portion and the peripheral portion of the screen.
It is preferable that the thickness is set in the range of 5 mm to 20 mm.

A front panel 8 made of transparent glass or a transparent resin such as an acrylic resin is adhered to the surface of the flat panel portion 3. That is, an adhesive resin layer having a relatively low hardness (about 0.3 mm in thickness) is formed on the surface of the flat panel section 3, and the front panel 8 is overlaid on this adhesive resin layer.
The front panel 8 receives an impact applied to the screen of the cathode ray tube from the outside, and the adhesive resin layer absorbs the impact. Therefore, by attaching the front panel 8,
The image display surface of the bulb 11 is substantially reinforced. Therefore, the flat panel portion 3 can be made thinner than when the front panel 8 is not attached.

By performing special processing on the front panel 8, various functions can be provided. For example, when the front panel 8 is mainly made of a transparent resin plate,
By increasing the surface hardness by the surface treatment and improving the scratch resistance or the abrasion resistance, scratches due to dust and the like can be suppressed. Alternatively, the visibility of a display image can be improved by forming an anti-reflection film on the surface for suppressing the reflection of a light beam incident from the outside, or by forming fine irregularities on the surface for irregular reflection.

Further, by imparting appropriate conductivity to the front panel 8, it is possible to prevent the flat panel portion 3 from being charged and to reduce the user's discomfort due to the discharge. The adhesive resin layer may have conductivity. Furthermore, by adjusting the light transmittance to an appropriate value by adding an additive to the glass material or the transparent resin material of the front panel 8, the image display surface can be more easily adjusted than adjusting the light transmittance of the flat panel portion 3 itself. Can be adjusted. This also contributes to improving the production yield of the valve 11.

Although the various functions as described above are basically independent functions, by forming a multilayer film on the front panel 8 or forming the front panel 8 into a multilayer structure, one front panel 8 can be formed. These functions can be combined. A film having multiple functions may be formed on the front panel 8.

FIG. 3 is a partial cross-sectional view showing that a front panel 8 having a multilayer structure has an adhesive resin 13 attached to a flat panel portion 3 of a valve.
2 schematically shows a state in which the sheet is adhered via the layer of FIG. The front panel 8 includes a panel body 8a, a conductive layer 8b, and a high hardness layer 8c. Adhesive resin 13 and adhesion (sticking)
The method will be described later.

The panel body 8a for obtaining an antistatic function
The conductive layer 8b formed on the inner surface of the substrate is made of powdered tin oxide (SnO ₂ ) and silicon oxide (SiO ₂ ), which are conductive materials. In order to obtain a sufficient antistatic function, the conductive layer 8
It is desirable that b has a conductivity of at least 5 × 10 ⁻⁴ S / cm. It is desirable that the conductive layer 8b be grounded via the reinforcing band 10 with a conductive tape or the like.

The high hardness layer 8c formed on the outer surface of the panel body 8a to increase the surface hardness is coated with a thin film of a polymer having a siloxane bond similar to the molecular skeleton of glass by a silicone hard coat treatment. It is formed in. Specifically, an alkoxysilane-based composition, for example, a material containing an alkyltrialkoxysilane, or a material further containing a silane coupling agent is applied to the surface of the panel body 8a, and dried and heated to form an alkoxysilane. Is hydrolyzed and polymerized to form the high hardness layer 8c. In order to further increase the hardness and durability, the high hardness layer 8c is preferably formed of a material obtained by mixing colloidal silica with a hydrolyzate of alkyl trialkoxysilane.

The high hardness layer 8c formed as described above
Not only increases the surface hardness of the front panel 8 but also functions as a non-reflective film. As a result, the phenomenon that the image displayed on the screen becomes difficult to see due to the reflection of the light beam incident from the outside is prevented or reduced. Further, in order to control the light transmittance of the front panel 8, a black dye or pigment is dispersed in the panel body 8a as an additive. By adjusting the dispersion state of the additive, a light transmittance value in a preferable range (for example, 90% to 40%) can be obtained. In addition, as an example, the thickness of the panel main body 8a is set to 2.4.
mm, the thickness of the conductive layer 8b and the high hardness layer 8c is about 0.01 mm. The conductive layer 8b may be formed on the outer surface of the front panel main body 8a. In this case, it is desirable that the conductive layer 8b be formed between the front panel main body 8a and the high hardness layer 8c. This is because the conductive layer 8b has a high refractive index, and if formed on the surface, specular reflection becomes strong, and the display image may be difficult to see.

Next, a method of stacking (ie, adhering) the above-described front panel to the flat panel portion of the valve via an adhesive layer will be described with reference to some embodiments and drawings.

(Embodiment 1) FIGS. 4 to 8 show a first embodiment of the present invention.
1 shows a method for manufacturing an image display device according to an embodiment.

As shown in FIG. 4, a reinforcing band (hereinafter also referred to as "shrink band") 10 fixed around the wall portion 9 of the valve 11 by shrink fitting is attached to the valve 1.
It was mounted so as to protrude from the flat panel surface 22 by about 2.0 mm. The mounting position of the conventional shrink band 10 was a position retracted from the flat panel surface 22 by 5 to 20 mm. Thus, the shrink band 10
Is projected from the flat panel surface 22 to prevent the adhesive resin 13 applied to the flat panel surface 22 from flowing out around the bulb 11 (the wall portion 9) when the front panel 8 is adhered to the flat panel surface 22. In addition, the positioning of the front panel 8 is facilitated. Furthermore, the protruding shrink band 10 can protect the edge of the front panel 8 from external impact.

Next, the flat panel surface 22 was polished with an abrasive (for example, "Selox" (trade name)) or the like, and then a surface finish for removing dirt and dust by wiping with alcohol, wiping with an empty cloth, or the like was performed. Also, the bonding surface 8d of the front panel 8 was also subjected to only the surface finishing described above. In addition, on the surface of the front panel 8 (the side opposite to the adhesive surface), an ultraviolet-permeable protective sheet 24 (for example, “SPV-224 transparent” (trade name) manufactured by Nitto Denko Corporation)
Is attached in advance.

Next, a resin tape having a width of about 20 mm, for example, a polyethylene terephthalate film tape 27
(For example, "Polyester Tape No.
31B "(trade name)) so as to protrude from the front end surface of the shrink band 10 by about 7 mm.
I stuck it around. Thereby, a wall for preventing the adhesive resin 13 from leaking is formed. In the step of positioning one side of the front panel 8 on the inner wall of the shrink band 10 described below, the adhesive resin of the tape 27 protrudes from the front end face of the shrink band 10 to facilitate the positioning. Is not provided.

Next, in order to prevent the adhesive resin from leaking from the joint portion 25 (see the plan view of FIG. 5) of the shrink band 10, a high-viscosity ultraviolet curable resin (for example, “UVU-1002S” manufactured by Sanyo Chemical Industries, Ltd.) (Trade name)) was applied to this portion to perform clogging. The order of the plugging step and the wall forming step may be interchanged,
By leaving the plugging step, the gap between the mylar tape 27 and the shrink band 10 constituting the wall can also be plugged at the same time.

Next, as shown in FIGS. 6A and 6B, an adhesive resin (for example, “UVU-1002” manufactured by Sanyo Chemical Industries, Ltd.)
(Trade name) 13 is applied so as to spread over the entire surface of the flat panel surface 22. The means for applying the adhesive resin 13 to the flat panel surface 22 includes, for example, a pipe 16b having a diameter of 16 mm having a plurality of supply tubes 48a and a plurality (30 to 50) of outlet pipes 48c having a diameter of 2 mm connected at intervals of 7 mm. The adhesive resin 13 is applied to the flat panel surface 22 by moving the nozzle 48 from one short side to the other short side of the flat panel surface 22 at a constant speed. At this time, as shown in FIG. 4, a jig body 51 having a horizontal surface 50 and a jig body 5
1 from the horizontal surface 50 provided on the horizontal surface 50
The flat panel surface 22 is tilted by mounting the valve 11 on tilting means 55 including support stands 52a and 52b having different heights up to 1a. As a result, the flat panel surface 2
The layer thickness of the adhesive resin 13 applied to the second panel 2 is smaller on the side opposite to the one side 8 e of the front panel 8. At this time, for example, in the case of a 41 cm tube CRT, the inclination angle θ of the flat panel surface 22 is about 1 degree, the resin amount of the adhesive resin 13 is about 0.1 ml / cm ^{2 on} average, and the viscosity of the adhesive resin 13 is It is set to about 130 cps. Under this condition, the layer thickness of the adhesive resin 13 is 1.2 m on one side 8 e of the front panel 8.
m, and 0.5 mm on the opposite side, so that the generation of air bubbles when the front panel 8 is attached to the flat panel surface 22 can be prevented.

As for the layer thickness of the adhesive resin 13, the ratio of the layer thickness between the thickest side of one side 8e of the front panel 8 and the thinner side opposite thereto is preferably about 7: 3. If this ratio is too large, the front panel 8 will be
It takes a long time to work down from the state of being inclined with respect to 2 until it becomes parallel, and the work efficiency is reduced. Also,
If the pitch of the outlet pipes 48c connected to the pipes 48b is too small, the resin coming out of the adjacent outlet pipes 48c will stick together before being dropped on the flat panel, and the coating cannot be performed normally. On the other hand, if the pitch of the outlet pipes 48c is too large, a region where the adhesive resin 13 does not spread over the flat panel surface 22 between the pitches is generated, and air bubbles are easily generated between the flat panel surface 22 and the front panel 8. . Further, the method of applying the adhesive resin 13 is not limited to the method using the nozzle 48 to which the plurality of outlet pipes 48c are connected as in the above-described embodiment, but the outlet is provided at the center of the flat panel surface 22 using one nozzle. There are a method of supplying a fixed amount, and a method of moving the nozzle in a circle from the center to the periphery. However, in the method of supplying a fixed amount to the central portion of the flat panel surface 22, it is necessary to maintain the viscosity of the adhesive resin sufficiently low so that the adhesive resin reaches the periphery.

Thereafter, in order to spread the entire surface of the flat panel surface 22 so that there is no uncoated portion of the adhesive resin 13, the flat panel surface 22 having the coated adhesive resin 13 is left in an inclined state for about 30 seconds. .

Next, as shown in FIG. 4, one side 8e of the front panel 8 is bonded with the inclination angle α of the bonding surface 8d of the front panel 8 to the flat panel surface 22 inclined at 10 to 20 °. The layer was brought into contact with the resin 13 layer. At this time, the end face of one side 8 e of the front panel 8 is brought into contact with the inner wall of the shrink band 10 protruding from the flat panel surface 22,
The front panel 8 can be positioned with respect to the flat panel surface 22 by aligning the end faces on both sides of e with the inner wall of the shrink band 10. In addition, one side 8 of the front panel 8 on the side to be brought into contact with the inner wall of the shrink band 10
As for e, if the longer side is used instead of the shorter side of the flat panel surface 22, bubbles are less likely to be generated. When the inclination angle α is smaller than 10 °, bubbles are easily generated, and the preferable inclination angle α is about 10 to 20 °.

Then, the front panel 8 is
It gradually fell down until it became parallel to 2. At this time, one side 8e of the front panel 8 which first contacted the layer of the adhesive resin 13
By gradually pressing the front panel 8 from the other side to the other side, bubbles in the layer of the adhesive resin 13 can easily escape. For example, using the vacuum suction mechanism 53 shown in FIG. 7, the front panel 8 sucked by the suction portion 53a of the vacuum suction mechanism 53 is placed at a predetermined position on the flat panel surface 22. It is necessary to release the vacuum and remove the front panel 8 from the suction portion 53a. For a moment when the vacuum is released, the front panel 8 is slightly lifted while being suctioned by the suction portion 53a,
Air is drawn into the adhesive resin 1 as shown in FIG.
The comb-like portion 13a is formed at the end of the third layer, and bubbles are easily generated between the flat panel surface 22 and the front panel 8. Therefore, as shown in FIG. 7, when the contact distance L1 between the front panel 8 and the adhesive resin 13 becomes about 2/3 of the width L2 of the front panel 8, the pressure on the front panel 8 is reduced. Then, the flat panel surface 22 and the front panel 8 are left standing by the weight of the front panel 8 until the plane panel surface 22 and the front panel 8 become substantially parallel (about 3 seconds). As a result, as shown in FIG. 8B, a layer of the adhesive resin 13 without the comb-like portion 13a is formed, and the entrainment of the air is eliminated.
The generation of bubbles between the panels can be reduced. Although the method of pressing the front panel 8 has been described for the case where the thickness of the adhesive resin 13 applied to the flat panel surface 22 is different, the method for pressing the front panel 8 can also be applied to the case where the thickness of the adhesive resin 13 is uniform.

Next, by a pressing mechanism (not shown) different from the vacuum suction mechanism 53, for example, a circular or elliptical aluminum or Teflon resin or the like is used to reduce the thickness variation of the adhesive resin 13. 20 kg (19 g / cm ² ) to 60 kg on front panel 8 via a plate
(47 g / cm ² ) with a uniform pressure of
By holding in a direction perpendicular to 2 for 10 seconds, bubbles generated together with the excess adhesive resin 13 are released, and a predetermined thickness of the adhesive resin 13 can be obtained. As a result, a clear image can be displayed, and since the conventional spacer is not used, the pressure can be evenly applied to the front panel 8, and the gap between the flat panel surface 22 and the front panel 8 can be substantially reduced. Can be uniform. The method of pressing the front panel 8 by the pressing mechanism has been described for the case where the layer thickness of the adhesive resin 13 applied to the flat panel surface 22 is different. Applicable. Incidentally, when the layer of the adhesive resin 13 is applied with a substantially uniform layer thickness, the ratio of trapping air bubbles in the finished product is 30 to 50%, but the layer thickness of the adhesive resin 13 applied to the flat panel surface 22 is small. Was almost zero according to the method of the present embodiment.

Thereafter, the adhesive resin 13 was cured by irradiating ultraviolet rays having an irradiation energy of 500 to 1800 mJ / cm ² . In this embodiment, the adhesive resin 13 is used.
UV curable resin was used as the material, but instead of this, a thermosetting resin (for example, the main agent: Fine Polymers Co., Ltd.)
Epifine 9235 manufactured by Fine Polymers Co., Ltd., and a curing agent may be used.

Finally, as a finish, the resin tape 27 for the wall stuck around the shrink band 10 was removed. At this time, if there is the adhesive resin 13 protruding above the surface of the front panel 8, if the adhesive resin 13 is cut off together with the resin tape 27 using a cutter or the like, the unnecessary adhesive resin 13 is effectively removed.
Can be removed. Further, the adhesive resin 13 overflowing onto the front panel 8 was removed together with the surface protection sheet 24, and the step of attaching the front panel 8 was completed. When the front panel 8 has a conductive layer, the front panel 8 and the shrink band 1 are connected with a conductive tape or the like after the attaching step.
Conduction with 0 is established.

(Embodiment 2) FIG. 9 shows a method of manufacturing an image display device according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that the adhesive resin 13 is applied to the flat panel surface 22. The difference is that the step of forming the layer and the step of superimposing the front panel 8 on the layer of the adhesive resin 13 formed on the flat panel surface 22 are simultaneously performed, thereby shortening the manufacturing time and preventing the entry of foreign matter and the like. .

That is, the end face of one side 8e of the front panel 8 is brought into contact with the inner wall of the shrink band 10 of the valve 11 mounted on the tilting means 55 shown in FIG. Angle α of the bonding surface 8d of
Is tilted to 10 to 20 °. Next, an injection port for injecting the adhesive resin 13 has a width of 2 mm and a length of 300 mm in the gap 54 between the flat panel surface 22 and the front panel 8.
mm of the front panel 8 abutted on the inner wall of the shrink band 10 from the end face side of the one side 8e of the front panel 8 while the adhesive resin 13 is being injected. Move. On the other hand, the front panel 8 moves in conjunction with the movement of the nozzle 49, with the end surface of the one side 8e abutting on the inner wall of the shrink band 10 as a fulcrum, in a direction in which the inclination angle α becomes smaller than the set inclination angle α. Rotate to Z. At this time, the amount of the adhesive resin 13 injected from the nozzle 49 is large on the side where the front panel 8 is in contact with the inner wall of the shrink band 10, and is reduced as it moves. In this method in which the manufacturing time is shortened and no foreign matter or the like is mixed, the method in which the layer thickness of the adhesive resin 13 applied to the flat panel surface 22 is different has been described. It can also be applied to things. By the way, the valve 1 can be
In the method of injecting the layer of the adhesive resin 13 by inclining 1, the generation of bubbles is reduced as compared with the method of injecting the layer of the adhesive resin 13 without inclining the valve 11.

After that, the front panel 8 is removed from the suction portion 53a of the vacuum suction mechanism 53 by using the vacuum suction mechanism 53 shown in FIG. 7. From this step onward, it is as described in the first embodiment. .

Next, on the basis of the method of the first embodiment and the second embodiment, the layer thickness of the adhesive resin 13 between the front panel 8 and the flat panel surface 22 is improved, and the adhesive resin is improved. A description will be given of another embodiment in which the layer 13 is improved to be less likely to peel off.

Next, a description will be given of an improvement that makes it difficult for the layer of the adhesive resin 13 to peel off. For the reasons mentioned above,
It is preferable that the layer of the adhesive resin 13 is thin (1.00 mm or less).
Of the layer easily occurs. In particular, when a product (image display device or a computer equipped with the same) is transported or stored in a container, the ambient temperature may rise to about 70 ° C. At this time, the layer of the adhesive resin 13 is peeled off. Is easy to occur.

In this embodiment, the step of applying the adhesive resin 13 to the flat panel surface 22 is performed under a temperature condition higher than room temperature in order to make it difficult for the layer of the adhesive resin 13 to peel off as described above. That is, as a result of the experiment,
The temperature of the flat panel surface 22 when applying is 5 to 20 ° C.
In this case, while the peeling of the layer of the adhesive resin 13 occurred at 70 to 100 ° C., the temperature of the flat panel surface 22 was reduced to 40 to 5 ° C.
When the adhesive resin 13 is applied while maintaining at 0 ° C.,
It was found that the temperature at which peeling occurred was 110 ° C. or higher.

If the upper limit temperature of the product during transportation and storage is 75 ° C., the adhesive resin 13 is applied while the temperature of the flat panel surface 22 is maintained at 30 ° C.
It was also found that no delamination occurred. Therefore, the application process of the adhesive resin 13 is performed at a temperature higher than room temperature (30 to 50 ° C.).
The method is not limited to this, and the adhesive resin 13 may be applied after the flat panel surface 22 is heated. The above effect can be obtained by applying the adhesive resin 13 while maintaining the temperature of the flat panel surface 22 at least at 30 to 50 ° C. In the plugging step described in the first embodiment, if a thermosetting resin is used as the plugging resin for preventing resin leakage, the plugging resin can be simultaneously cured when the flat panel surface 22 is heated. It is possible.

The embodiment in which the present invention is applied to a cathode ray tube has been described above with reference to the embodiments. However, the present invention is not limited to the cathode ray tube, but may be a plasma display panel (PDP),
It can be widely applied to an image display device having a flat display surface such as a liquid crystal panel (LCD), an EL, a vacuum display (VFD), and a micro cathode display. In the case of these image display devices, a wall for preventing leakage of the adhesive resin may be formed using a resin frame member or the like instead of the shrink band of the cathode ray tube.

[0053]

As described above, according to the present invention,
Since the front panel having functions such as reinforcement and anti-reflection can be efficiently attached to the surface of the flat panel of the image display device, it is possible to contribute to improvement of the manufacturing efficiency of the image display device and eventually to cost reduction. Further, since the occurrence of peeling of the resin layer can be suppressed while the thickness of the adhesive resin layer between the flat panel surface and the front panel is made thinner than before, the image display device is advantageous in terms of quality and reliability. Can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cathode ray tube included in an image display device according to an embodiment of the present invention as viewed from a side.

FIG. 2 is a partially cutaway perspective view showing a planar shadow mask and its frame provided in the cathode ray tube of FIG. 1;

3 is a partial cross-sectional view showing a multilayer structure including a front panel including a conductive film and an anti-reflection film of the cathode ray tube of FIG. 1, an adhesive resin layer, and a flat panel.

FIG. 4 is a side view of a cathode ray tube showing a first embodiment of the method according to the present invention for attaching a front panel to a flat panel portion of a bulb.

5 is a plan view of the cathode ray tube of FIG. 4 as viewed from an image display surface.

6 is a plan view and a side view showing a step of applying an adhesive resin to the surface of the flat panel in the cathode ray tube of FIG.

FIG. 7 is a side view showing a step of attaching a front panel to a flat panel portion of the bulb in the cathode ray tube of FIG.

FIG. 8 is a plan view showing an adhesive resin layer on a flat panel portion in the method of FIG. 7;

FIG. 9 is a side view of a cathode ray tube showing a second embodiment of the method according to the present invention for attaching a front panel to a flat panel portion of a bulb.

[Explanation of symbols]

 Reference Signs List 3 flat panel portion 8 front panel 8e one side of front panel 10 reinforcing band (shrink band) 13 adhesive resin 22 flat panel surface 24 surface protection sheet 27 resin tape 48, 49 nozzle (means for applying adhesive resin 13) 55 inclining means

Claims (9)

[Claims] 1. A method for manufacturing an image display device, wherein an image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel, wherein the adhesive resin layer is formed on a surface of the flat panel. A step of contacting one side of the front panel with the adhesive resin layer and tilting the front panel with respect to the flat panel, and then stacking the front panel on the flat panel; and After the front panel is overlaid, a step of curing the adhesive resin layer, the step of forming the adhesive resin layer, means for applying the adhesive resin on the surface of the flat panel,
An image display device comprising: a tilting means for tilting the flat panel so that the layer thickness of the adhesive resin applied to the surface of the flat panel is smaller on one side of the front panel than on the other side. Manufacturing method. 2. The step of stacking the front panel on the flat panel includes: holding one side of the front panel in contact with the adhesive resin layer and tilting the front panel with respect to the flat panel. Then, the front panel is rotated in a direction in which the inclination becomes smaller about a contact portion between the front panel and the adhesive resin layer as a fulcrum, and the contact distance between the front panel and the adhesive resin layer is reduced by the contact distance. 2. The method according to claim 1, wherein the front panel is held until the front panel width becomes 1/2 to 3/4 of the front panel width in the distance direction. 3. The method according to claim 1, wherein the step of forming the adhesive resin layer is performed under a temperature condition higher than room temperature. 4. When forming the adhesive resin layer on the surface of the flat panel, at least the temperature of the surface of the flat panel is maintained at 30 to 50 ° C.
4. The method for manufacturing an image display device according to claim 3. 5. Prior to the step of curing the adhesive resin layer, the front panel is pressed toward the surface of the flat panel, and the pressing of the front panel is performed via a circular or elliptical pressure plate. The method for manufacturing an image display device according to any one of claims 1 to 4, wherein: 6. Before the step of forming the adhesive resin layer,
Around the flat panel, a reinforcing band is attached so as to protrude from the surface of the flat panel, the surface of the flat panel is polished, and the surface of the adhesive surface of the front panel is finished, and further, around the reinforcing band, 6. The method according to claim 1, wherein a wall for preventing leakage of the adhesive resin is formed so as to protrude from a front end surface of the reinforcing band. 7. The method according to claim 1, wherein the front panel has a surface protection sheet, and after the step of curing the adhesive resin, the surface protection sheet is removed. A method for manufacturing an image display device. 8. A method for manufacturing an image display device in which an image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel, wherein the adhesive resin layer is formed on a surface of the flat panel. A step of stacking the front panel on the adhesive resin layer formed on the surface of the flat panel, and after the front panel is stacked on the adhesive resin layer,
Curing the adhesive resin layer, wherein the step of laminating the front panel is such that one side of the front panel is in contact with the adhesive resin layer and the front panel is inclined with respect to the flat panel. Then, the front panel is rotated in a direction in which the inclination becomes smaller around a contact portion between the front panel and the adhesive resin layer as a fulcrum, and a contact distance between the front panel and the adhesive resin layer is reduced. And holding the front panel until the width of the front panel becomes 1/2 to 3/4 of the width of the front panel in the contact distance direction. 9. A method for manufacturing an image display device in which an image display surface has a multilayer structure of a flat panel, an adhesive resin layer, and a front panel, wherein a step of forming an adhesive resin layer on the surface of the flat panel And a step of laminating the front panel on the adhesive resin layer formed on the surface of the flat panel, and a step of curing the adhesive resin layer after the front panel is laminated on the adhesive resin layer, A method for manufacturing an image display device, wherein a step of forming an adhesive resin layer on a surface of the flat panel and a step of stacking the front panel are performed simultaneously in conjunction with each other.