JPS63108642A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent arising of a hardened unevenness of a cast resin by hardening a transparent resin with it heated, with a hot blast at a given temperature blasted from an inlet for the transparent resin toward between a color cathode- ray tube and a transparent plate. CONSTITUTION:A cast resin 7 is hardened and a glass 3 is laminated and fixed to a faceplate of a color cathode-ray tube 1, by radiating ultraviolet rays of 700m J/cm<2> from a ultraviolet ray light source 6 simultaneously with a hot blast at the temperature of 40 deg.C generated with an electric heater and fan 13a blasting and heating the cast resin 7 from an inlet 4. This enables arising of a hardened unevenness to be prevented, with eliminating a retraction of an unhardened resin 12 near an inlet 4 toward under the inlet 4 along a downflow 11 as the downflow of the cast resin 7 is restrained. Therefore, a faceplate can have a high quality.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a transparent plate such as a safety glass or anti-reflection glass to prevent implosion, which is placed at a predetermined interval in front of the screen of a color cathode ray tube. , relates to a method for manufacturing color cathode ray tubes that are bonded together via a transparent resin.

[Prior art] Figures 4 (a) to (C) show, in order of process, a method of bonding a color cathode ray tube and a transparent plate such as glass placed in front of the screen, in a conventional method of manufacturing a color cathode ray tube. It is a diagram.

First, as shown in m 4 G (a), a transparent resin is poured around the transparent plate (3), which has the same size as the screen (2) of the color cathode ray tube (1) and has approximately the same curvature. A thixotropic ultraviolet curing acrylic resin, that is, a sealing resin (5) is applied to a predetermined width and thickness, leaving only the part that will become the entrance (4).

Next, as shown in FIG. 4(b), the transparent plate (3) is placed in front of the screen (2) of the color fluoroun tube (1) at a predetermined interval. ) by irradiating the transparent plate (3) with ultraviolet light from a chemical lamp-type ultraviolet light source (6) placed in front of the screen (6) to harden the sealing resin (5).
) fixed in front.

Next, after injecting and filling a transparent ultraviolet curable acrylic resin, that is, a casting resin (7) through the injection port (4), as shown in FIG.
) is again irradiated with ultraviolet rays to harden the casting resin (7), thereby bonding and fixing the transparent plate (3) on its entire surface to the screen (2) of the cathode ray tube (1).

[Problems to be Solved by the Invention] Since the conventional method for manufacturing color cathode ray tubes involves the steps described above, during the irradiation with ultraviolet rays as shown in FIG. Due to curing shrinkage, the liquid level (8) of the casting resin (7) drops near the injection port (4), as shown in the enlarged view in FIG. ) occurs. If such curing unevenness (9) occurs, it will interfere with the mosaic structure of the screen (2) of the color fluorine tube (1) due to the difference in refractive index between the casting resin (7) and the surrounding casting resin (7). That part looks sparkling.

In other words, there was a drawback that the screen quality of the color cathode ray tube (1) was significantly deteriorated due to glare.

This invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a color cathode ray tube that can improve the quality of one screen by preventing the occurrence of uneven curing of the casting resin. With the goal.

[Means for Solving the Problems] The method for manufacturing a color cathode ray tube according to the present invention includes blowing hot air at 40 to 80°C from a transparent resin injection port between the color cathode ray tube and the transparent plate, and The transparent resin is cured while being heated with hot air.

[Function] In this invention, by employing hot air heating means as a means for curing the transparent casting resin injected into the space between the color cathode ray tube and the transparent plate laminated thereon,
The downward flow of the casting resin, which is caused by the temperature difference between the color cathode ray tube and the casting resin and the heat radiation from the injection port, is suppressed. Therefore, the uncured resin near the injection port is not drawn downward from the injection port along the downward flow.
The resin is cured uniformly, preventing uneven curing.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the injection molding agent filled between the safety glass and the color CRT to prevent implosion during the manufacturing process of a color CRT according to an embodiment of the present invention. ! 3 is a diagram illustrating a resin curing procedure, and the same components as those shown in FIG. 3 in the same IA are given the same reference numerals. FIG.

FIG. 1 shows the state after the steps in FIGS. 4(a) and 4(b), in which hot air of 40°C generated by the TL thermal heater and fan (1:Ia) is injected into the injection port ( 4) is sprayed onto the casting resin (7) and heated, and at the same time, the ultraviolet light source (6) is irradiated with ultraviolet rays of 700 mJ/cs2 to harden the casting resin (7). 3) is pasted and fixed on the screen (2) of the color cathode ray tube (1).

When using such a curing method, (11) in Figure 2
Since the downward flow of the casting resin (7) as shown in is suppressed, the uncured resin (12) near the injection port (4) descends i%!
(11) and is not drawn below the injection port (4), thereby preventing uneven curing.
We can manufacture explosion-proof color cathode ray tubes with high screen quality.

FIG. 3 shows another embodiment of the present invention, in which an antireflection glass (14) having an antireflection film is attached to a color cathode ray tube (1).
In front of the screen (2), place a spacer (1
This anti-reflection glass (1
4) and a color cathode ray tube (1) are fixed with a polyester tape (16) wrapped around them.

Then, a part of the polyester tape (16) is removed to form a resin injection port (4).
) is injected and filled with thermosetting two-component silicone resin (7).

Next, this color cathode ray tube (1) is placed in a curing furnace at 60°C (not shown), and hot air at 80°C is applied to the injection port ( 4) and then spray it onto the cast silicone resin (7).
By humidifying for about 2 hours, the cast silicone resin (7) is cured, and the antireflection glass (14) and the color cathode ray tube (1) are bonded and fixed.

Also in the case of the other embodiment described above, a color cathode ray tube with high screen quality can be manufactured without any curing unevenness occurring near the injection port (4).

In addition, in each of the above examples, ultraviolet curable acrylic resin and thermosetting silicone resin were used as the casting resin (7), but ultraviolet curable silicone resin, thermosetting polyester resin, thermosetting resin A similar effect can be obtained by using a UV-curable epoxy resin, an ultraviolet-curable urethane resin, or the like.

In addition, the transparent plate may be a transparent plastic plate such as a transparent acrylic plate other than the glass shown in each of the embodiments described above.

[Effects of the Invention] As described above, according to the present invention, the downward flow of the resin that occurs due to the temperature difference between the color cathode ray tube and the cast transparent resin and the curing shrinkage of the resin, and the downward flow of the resin. Since it is possible to prevent the uncured resin from being drawn in by the flow, it is possible to prevent uneven curing, that is, the occurrence of glare, caused by the difference in refractive index in the vicinity of injection, and it is therefore possible to obtain a color cathode ray tube with extremely excellent screen quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an embodiment of the method of this invention;
Figure 2 is a diagram for explaining the flow that occurs in the casting resin during curing, Figure 3 is a perspective view of the main part showing another embodiment, and Figures 4 (a) to (C) are steps of the conventional method. FIG. 5 is a perspective view of the main parts shown in order, and FIG. 5 is an enlarged sectional view of the main parts for explaining the drawbacks of the conventional method. (1)--Color cathode ray tube, (2)...Screen, (
:l), (4)...Transparent plate (safety glass, anti-reflection glass), (7)...Transparent casting resin, (13)...
Hot air generator. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) After laminating a color cathode ray tube and a transparent plate such as glass placed at a predetermined interval in front of the screen of this color cathode ray tube in such a way that a transparent resin injection port is left only in a part of the periphery, In a method for manufacturing a color cathode ray tube, in which a transparent resin is injected and filled from the injection port, and then the transparent resin is cured while the injection port is left open, the transparent resin filled between the cathode ray tube and the transparent plate is , 40-80° sprayed from the above injection port
A method for producing a color cathode ray tube characterized by curing while heating with hot air. (2) The method for manufacturing a color cathode ray tube according to claim 1, wherein the transparent plate is a safety glass for preventing implosion of the cathode ray tube. (3) The method for manufacturing a color cathode ray tube according to claim 1, wherein the transparent plate is antireflection glass.