JP2002225145A - Cathode ray tube and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the adhesive strength of a surface treated film. SOLUTION: A surface treated film with an anti-reflection function to an outdoor light is applied to the display face of a panel for a cathode ray tube and heated. As heating conditions for the surface treated film, the film is left alone at a heating temperature of 50 to 70 deg.C for at least 40 hours. Consequently, the adhesive strength of the surface treated film to the display face of the panel is enhanced by performing the described thermal treatment, that is, about 1.6 to 2.2 times as high as the adhesive strength obtained by a conventional method. Besides, the surface treated film also functions as a reinforcing film and an explosion-proof film, so that the panel of such a structure that the thickness of glass is small can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube and a method of manufacturing the cathode ray tube. Specifically, by heating the surface treatment film adhered to the display surface of the panel under predetermined conditions, the adhesive strength of the surface treatment film to the panel display surface can be increased.

[0002]

2. Description of the Related Art As shown in FIG. 5, a cathode ray tube (CRT) comprises a panel 12 coated with a phosphor and a funnel 14 in which an electron gun is housed. As a completed product of the panel 12, as shown in FIG. 6, a well-known stripe-shaped R, G, B phosphor 16 is formed on the inner surface thereof, and an aperture grille as a color selection mechanism is formed. (AG) 18 is fixed.

The display surface (tube surface) 12a of the panel 12 includes:
Surface treatment is performed to prevent the charging of the display surface 12a and to improve the light emission luminance of the phosphor by absorbing or scattering external light. As is well known, the surface treatment film 20 has an antistatic function and an antireflection function.

As shown in FIG. 7, a surface treatment film 20 coated with an adhesive 22 is used, and is adhered over the panel display surface 12a. A pressure roller (rubber roller) 24 is used as a sticking jig, and the surface treatment film 20 is pressed against the panel display surface 12a via the pressure roller and moved, so that the surface treatment film 20 is applied to the panel display surface 12a. Is affixed.

[0005]

By the way, in recent years, the tendency of the cathode ray tube to be thin has increased, and the thickness of the glass material constituting the panel 12 and the funnel 14 has been reduced as much as possible. Accordingly, the surface treatment film 20 attached to the surface of the panel display surface 12a also has an antistatic function,
In addition to the antireflection function, it has been required to provide a reinforcing function for the panel 12. Panel display surface 12a
In general, the reinforcing function is performed by the adhesive strength of the surface treatment film 20.

FIG. 8 shows measurement data of the adhesive strength of the surface treatment film 20. In the case where an acrylic resin is used as the adhesive, the adhesive is made of the same material from different adhesive manufacturers A, B, C and D. The adhesive strength when the adhesive 22 is used is shown.

This measurement data is obtained when the surface treatment film 20 is adhered by the conventional method, which is different from the conventional method in that the surface treatment film 20 is adhered to the panel display surface 12a while being pressed by the pressure roller 24. , Room temperature (20-30
C.), and this panel 12 was used as an article to be measured. The measurement method was based on “JISZ0237”, and was measured 30 minutes or 24 hours after the surface treatment film 20 was attached (adhered).

As is clear from FIG. 8, although there is some variation depending on the adhesive maker, the value of the adhesive strength is
It exists in the range of 1.33 kg / 25 mm to 2.07 kg / 25 mm.

As described above, this measured value is slightly too low to aim at the reinforcing effect on the panel 12. When a CRT having a small thickness is used, it is preferable that the measured value is at least 2.07 kg / 25 mm or more.

Therefore, the present invention has solved such a conventional problem, and in particular, it is possible to increase the bonding strength by 1.5 times or more only by adding a step of performing a heat treatment after sticking. A cathode ray tube having a tube manufacturing method and a surface treatment film having a predetermined adhesive strength is proposed.

[0011]

According to a first aspect of the present invention, there is provided a method for manufacturing a cathode ray tube, comprising the steps of: attaching a surface treatment film to a display surface of a panel of the cathode ray tube; A method of manufacturing a tube, wherein after applying a surface treatment film to the panel display surface, by performing heat treatment under predetermined heating conditions, the adhesive strength of the surface treatment film to the panel display surface is enhanced. It is characterized by having done.

According to a third aspect of the present invention, there is provided a cathode ray tube having a surface treatment film adhered to a panel display surface, and the adhesion strength of the surface treatment film to the panel display surface is 2. 30 kg / 25 mm or more.

In the present invention, after attaching the surface treatment film,
Heat treatment is performed instead of being left in a room temperature environment.
Specifically, at a heating temperature of 50 ° C. or more and 70 ° C. or less, 4
A heat treatment step of leaving for 0 hour or more is performed.

By performing this heat treatment, the adhesion between the adhesive applied to the surface treatment film and the panel display surface (tube surface) is improved, and the adhesive strength is increased. Thereby, it was possible to obtain an adhesive strength 1.5 times or more (2.30 kg / 25 mm or more) as compared with the related art. If 1.5 times or more of the adhesive strength is obtained compared to the conventional one, it will function sufficiently as a thin CRT explosion-proof film. Therefore, in addition to the original functions of antistatic function and antireflection function, surface treatment with a reinforcing function This means that a film has been formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a cathode ray tube and a method of manufacturing the same according to the present invention will be described in detail with reference to the drawings. The cathode ray tube according to the present invention has the same structure as the conventional structure shown in FIG. Therefore, as shown in the conceptual diagram of FIG.
Both are fixed by a frit seal, and a stripe-like phosphor 16 is formed on the inner surface of the panel 12, for example. An electron gun (not shown) is sealed in the neck of the funnel 14. Panel 12
The surface treatment film 20 is attached to the display surface 12a. The adhesive strength of the surface treatment film 20 stuck on the panel display surface 12a to the panel display surface 12a is 1.5 times or more that of a conventional one, specifically, 2.30 kg / 25 mm or more. Details will be described later.

FIG. 1 shows a surface treatment film 2 applicable to the present invention.
0 shows an embodiment. In this embodiment, a transparent polyethylene terephthalate resin material (PET) is used as the base material 31.
Material). The adhesive 22 is applied to the entire lower surface of the base material 31. As the adhesive 22, the same acrylic adhesive as that of the related art is used.

An anti-reflection layer 40 having a multilayer structure is formed on the upper surface of the base material 31 via a hard coat layer 32 for reinforcement using a sputtering apparatus or the like. In this example, a case of a five-layer structure is used, and the first silicon oxide (SiOx) is used.
A layer 41, a second layer 42 of indium tin oxide (ITO) functioning as an antistatic layer, a third layer 43 of silicon dioxide, a fourth layer 44 of ITO, and a fifth layer 45 of silicon dioxide. The multilayer antireflection layer 40 sequentially formed in this order is configured.

The final surface (uppermost surface) is coated with an antifouling film 50 made of a fluororesin to form a surface treatment film 20.
Is configured. The antireflection layer 40 may have a three-layer structure instead of a five-layer structure, or any other multilayer structure. The overall thickness of the surface treatment film 20 is 0.1 to 1.0 m
m.

The surface treatment film 20 having such a multilayer film structure is adhered to the panel display surface 12a. Panel display surface 12a
The same method as that of the conventional method can be used for the method of sticking to the substrate. Therefore, also in this embodiment, as shown in FIG. 2, the pressure-sensitive adhesive roller 24 is used to adhere to the panel display surface 12a. The panel display surface 12a is cleaned as a pretreatment for sticking, and dust and organic substances attached to the panel display surface 12a are removed. Then, the drying process of the panel display surface 12a is performed. The above-mentioned surface treatment film 20 is pressure-bonded and adhered to the dried panel display surface 12 a using a pressure roller 24. After crimping, the process moves to the heating step.

The heat treatment is performed in a heating furnace using a time of 40 hours to 50 hours. The heating temperature is 50 ° C. or more and 70 ° C. or less. Here, the adhesive 2
It turned out that the adaptation to the panel display surface 12a of No. 2 was not sufficient. At 70 ° C. or higher, it was found that the substrate 31 and the multilayer antireflection layer 40 were apt to wrinkle.

The experiment is a continuous heating at 50 ° C. for 48 hours. Next, the measurement results of the adhesive strength of the surface treatment film 20 at that time will be described. As described above, the measurement of the adhesive strength
ISZ0237 "standard, after heating for 48 hours,
The measurement is carried out at room temperature for 30 minutes or after 24 hours. The experiment was performed after 24 hours.

As shown in FIG. 3A, the center of the panel display surface 12a has a band shape in the horizontal scanning direction.
The strip is cut to a width of mm, and this strip is used as a surface treatment film piece 20a to be measured. Then, as shown in FIG. 3B, the end face 52 of the surface treatment film piece 20a is picked up and hooked on the measuring equipment 54. When the measuring device 54 is pulled up in this state, the strength at which the surface-treated film piece 20a peels off from the panel display surface 12a is measured as the adhesive strength.

FIG. 4 shows the measurement results. FIG. 4 shows the adhesive strength according to the conventional method, the adhesive strength according to the present invention, and the adhesive strength ratio between the conventional and the present invention. As the adhesive 22, an acrylic resin is used as shown in FIG. There are four adhesive manufacturers (A, B, C, D) as in the past. As a result, the bond strength was at least 2.30 kg / 25 mm, indicating that the bond strength was further increased to 1.6 times the maximum bond strength obtained by the conventional method. The maximum value is 2.2 times, and the highest value of the adhesive strength is 3.63 kg / 2 by the adhesive maker A.
5 mm was recorded.

With an adhesive strength of not less than 2.30 kg / 25 mm, the surface treatment film 20 has an antistatic function and a reflection function, which are the original functions, even if the panel 12 has a reduced glass thickness. In addition to the prevention function, it also functions as a reinforcing film and an explosion-proof film, and it has been found that a sufficient reinforcing effect can be obtained.

[0025]

As described above, the method for manufacturing a cathode ray tube according to the present invention is characterized in that a heat treatment is performed after a surface treatment film is adhered to a panel display surface. The cathode ray tube according to the present invention has an adhesive strength of 2.3.
It is characterized by having a surface treatment film of 0 kg / 25 mm or more.

According to this, it was found that the familiarity between the panel display surface and the adhesive was improved by the heat treatment, and the adhesive strength could be significantly increased. This allows the surface treatment film to function as a reinforcing film and an explosion-proof film in addition to the antistatic function and the antireflection function, which are the original functions, and a sufficient reinforcing effect can be achieved. Therefore, the surface treatment film has a feature that it can be provided with a reinforcing and explosion-proof function in addition to an antistatic function and an antireflection function only through a simple processing step of heating. Therefore, the present invention is very suitable for application to a cathode ray tube such as a cathode ray tube of a television receiver or a monitor cathode ray tube of a computer or the like, and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a layer structure showing an embodiment of a surface treatment film used in a method of manufacturing a cathode ray tube according to the present invention.

FIG. 2 is a view showing a step of pressing a surface treatment film on a panel display surface of the cathode ray tube according to the present invention.

FIG. 3 is a diagram showing an example of measuring the adhesive strength of a surface-treated film.

FIG. 4 is a diagram showing an example of measurement data showing a result of measuring an adhesive strength.

FIG. 5 is a configuration diagram of a CRT.

FIG. 6 is a sectional view of the panel.

FIG. 7 is a view showing a pressure bonding step of the surface treatment film.

FIG. 8 is a diagram showing a measurement result of a conventional adhesive strength.

[Explanation of symbols]

10: cathode ray tube (CRT), 12: panel, 1
2a: panel display surface, 14: funnel, 16
... Phosphor, 20 ... Surface treatment film, 22 ... Adhesive, 31 ... Equipment, 32 ... Hard coat material, 40
... Anti-reflection layer

Claims (3)

[Claims] 1. A method for manufacturing a cathode ray tube, wherein a surface treatment film is attached to a display surface of a panel of a cathode ray tube, wherein the surface treatment film is attached to a display surface of the panel, and then heated under a predetermined heating condition. Thereby enhancing the adhesive strength of the surface treatment film to the panel display surface. 2. The heating condition for the surface treatment film is 5
2. The method for producing a cathode ray tube according to claim 1, wherein the cathode ray tube is left at a heating temperature of 0 ° C. or more and 70 ° C. or less for 40 hours or more. 3. A cathode ray tube having a surface treatment film adhered to a panel display surface, wherein an adhesion strength of the surface treatment film to the panel display surface is 2.30 kg / 25 mm or more. .