JPH01194238A - Manufacture of cathode-ray tube with front glass - Google Patents

Abstract

PURPOSE:To prevent exfoliation by forming a frame-shaped adhering and fixing part at the periphery of the gap between a front glass and a cathode-ray tube using an adhering and fixing resin, and by pouring an adhesive resin for adhesion/fixation into the whole gap, followed by hardening. CONSTITUTION:A front glass 3 is installed over the surface of the panel of a cathode-ray tube with a spacer 2 interposed, and the surroundings of the tube and glass are sealed with a tape 6, and an adhering and fixing resin 7 is poured from a hole 4 to a depth of approx. 5mm at the lower long edges. The cathode-ray tube 1 is fixed, ultraviolet rays irradiated, and the resin hardened. Then the cathode-ray tube is tilted 90 deg. to the right, and the resin 7 is poured to a depth of approx. 5mm alike from the hole 4 to the lower shorter edges, followed by hardening. Further the cathode ray tube is tilted 180 deg. to the left, and the resin 7 is poured to shorter edges, followed by hardening. The tube is returned to the initial position, and the resin 7 is poured from the hole 4 so as to fill the whole gap, followed by hardening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a cathode ray tube in which a front glass is fixed to a panel surface.

[Conventional technology]

Conventionally, a cathode ray tube with a front glass is known in which a front glass is fixed to the panel surface of the cathode ray tube with an adhesive fixing resin to provide explosion-proof reinforcement. The manufacturing method for such a cathode ray tube with a front glass is as follows: First, approximately 5 mm square spacers made of polyester are placed at the four corners of the panel surface of the cathode ray tube in a diagonal to create a gap between the cathode ray tube and the front glass. After placing the glass and covering the gap on the outer periphery with tape, adhesive fixing resin is injected from the injection port, and heated or UV irradiated.
This was done by curing the adhesive and fixing resin.

[Problem that the invention seeks to solve]

The conventional cathode ray tube with a front glass described above was mainly manufactured for small tubes of 20-inch class or smaller, but in recent years, as screens have become larger, explosion-proof reinforcement has been applied to large cathode-ray tubes of 30-40 inch class. Alternatively, it has become necessary to install a front glass to provide an anti-glare effect. As cathode ray tubes become larger, the weight of the front glass and adhesive fixing resin increases, and conventionally, the gap around the front glass and cathode ray tube was filled with tape, but due to their weight, adhesive fixing resin injection was used. Occasionally, the tape would peel off and the adhesive fixing resin would leak. As a countermeasure to this problem, there is a method of filling the gap between the front glass and the cathode ray tube with a resin with high adhesive strength (referred to as edging resin) instead of tape to prevent the adhesive fixing resin from leaking from between the front glass and the cathode ray tube. It is taken. However, most of the current edge trimming resins are colored, which significantly impairs the appearance of the outer periphery of the cathode ray tube.Also, there is a difference in the volumetric shrinkage rate during curing between the adhesive fixing resin and the edge trimming resin. There was a problem in that peeling occurred between different resins due to minute differences in shrinkage and differences in coefficient of thermal expansion over a long period of time.

[Means for solving problems]

In the present invention, a frame-shaped adhesive fixing part with a width of 5 mm or more is formed using an adhesive fixing resin for adhesively fixing the front glass to the outer periphery of the gap between the front glass and the cathode ray tube, and then the front glass and the cathode ray tube are bonded to each other. This is a manufacturing method for a cathode ray tube with a front glass, in which adhesive and fixing resin is injected into all gaps between the tubes and the tube is cured and bonded (fixed).

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram for explaining the first manufacturing process of the present invention. First, as shown in FIG. 1(a), a front glass 3 is installed on the panel surface of a cathode ray tube (not shown) with a gap determined by a spacer 2, and the area around the cathode ray tube and the front glass is covered with tape 6. The adhesive fixing resin 7 is poured into the lower long side through the injection port 4 to a depth of about 5 mm. Next, the cathode ray tube 1 is fixed in this state as shown in FIG. 2, and the adhesive and fixing resin is cured by irradiation with ultraviolet rays. Then the first
As shown in Figure (b), the cathode ray tube is tilted to the right by 90°, and adhesive fixing resin 7 is similarly poured into the lower short side to a depth of about 5 mm from the injection port 4, and cured. Further, as shown in Fig. 1(C), tilt the cathode ray tube 180 degrees to the left, inject and harden adhesive fixing resin 7 on the short side, and return the cathode ray tube to its original position. As shown in (d), a frame-shaped hardened adhesive fixing resin 17 is provided on three long and short sides. Finally, adhesive fixing resin 7 is injected from the injection port 4 so as to fill the gap, the injection port is covered with tape, and the resin is cured by irradiation with ultraviolet rays to complete the installation of the front glass. If the frame-shaped part is less than 5 mm, the adhesive strength of the frame-shaped part will be insufficient and resin leakage will occur, so 5 mm or more is required. In the present invention, since the adhesive fixing resin is also used for the frame part, the color can be changed. It is not attached and does not spoil the appearance. Moreover, no peeling occurs at the interface between the frame-shaped portion and the internal resin.

FIG. 3 is a diagram for explaining the second manufacturing process of the present invention. In this example, the injection port 4 is installed on the short side, and after curing one of the long sides, the injection port 14 is newly installed by cutting the adhesive fixing resin, and the short side on the injection port 4 side is cured. , and is used when injecting adhesive and fixing resin into the front surface.

〔Effect of the invention〕

As explained above, the present invention solves the drawback that conventional tape was used to block the area around the front glass and cathode ray tube, so when adhesive fixing resin was injected, the tape peeled off and the adhesive fixing resin leaked. Adhesively fixing it in a frame shape with a fixing resin has the effect of preventing the adhesive fixing resin from leaking.

Furthermore, it also has the effect of preventing peeling at the interface that occurs between different resins, such as the conventional edging resin and adhesive fixing resin.

[Brief explanation of the drawing]

1(a) to 1(d) are front views for explaining the manufacturing process of the first embodiment of the present invention, FIG. 2 is a side view showing one example of the curing method of this embodiment, and FIG. The figure is a front view for explaining a manufacturing method of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Cathode ray tube, 2... Spacer, 3... Front glass, 4.14... Inlet, 6... Tape, 7...
... Adhesive fixing resin, 13... Ultraviolet lamp, 17.
...Cured adhesive fixing resin.

Claims (1)

[Claims] In a manufacturing method for a cathode ray tube with a front glass, in which a front glass is provided on the panel surface of the cathode ray tube via a spacer, and an adhesive fixing resin is injected into the gap and then hardened and bonded, the front glass is attached to the outer periphery of the gap between the front glass and the cathode ray tube. A cathode ray tube with a front glass, characterized in that a frame-shaped adhesive fixing part is formed with an adhesive fixing resin for adhesively fixing glass, and then the adhesive fixing resin is injected into the entire gap, hardened, and adhesively fixed. Production method.