JPS62113334A - Manufacture of explosion-proof cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent a peeling phenomenon from occurring between a front surface plate and adhesion resin, by composing ultraviolet-ray hardened resin of high-molecular compound having a photosensitive group. CONSTITUTION:As ultraviolet-ray hardened resin, photosensitive epoxy resin is obtained in a structural formula, in which OH groups of epoxy resin obtained by polycondensing epichlorohydrin and bisphenol A are esterified with cinnamic acid and cinnamoyl groups photosensitive to light are made pendant on the resin. The obtained photosensitive epoxy resin is hardened by radiating ultravio let rays of a definite wavelength in use of a chemical lamp. This manufacturing method enables a contraction rate of ultraviolet-ray hardened resin 9 to be suppressed under 1%, and therefore a peeling phenomenon does not occur be tween a front surface plate 5 and a boundary plane.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a protective glass plate for preventing danger from implosion or an anti-reflection plate for reducing eye fatigue on the front surface of the luminescent screen of a cathode ray tube. The present invention relates to a method of manufacturing an explosion-proof cathode ray tube equipped with such a device.

[Prior Art] A conventional protective glass plate for a cathode ray tube is manufactured according to the steps shown in FIGS. 1 to 5.

FIG. 1 is a plan view of the cathode ray tube, FIG. 2 is a front view of the cathode ray tube, and FIGS. 3 to 5 are manufacturing process diagrams taken along the line A--5 in FIG. 2.

First, as shown in FIG. 2, one spacer (4) having a predetermined height is placed at each of the four corners of the front surface (2a) of the face panel (2) of the cathode ray tube (1). Next, as shown in Figure 3, place the cathode ray tube (
A front plate (5) having approximately the same size and curvature as the front surface (2a) of the face panel (2) of 1) is arranged, and an inlet member (6) is arranged between the face panel (2) and the front plate (S). An air vent member (sword) is provided.Furthermore, after positioning the front plate (5) with respect to the face panel (21), the front plate (5) is crimped onto the spacer (4).

In this state, as shown in Figure 4, the face panel ('2
From the outer circumference (2b) of J to the front plate (5),
Wrap the polyester cheese (8) around it. At this time, the portion of the polyester chive (8) protruding from the convex side of the front plate (5) is bent to the convex side of the front plate (5). Then, remove the part of the wrapped polyester tape (8) that covers the inlet member (6) and the air handling member (7), and remove the face from the inlet member (6) as shown in FIG. The adhesive resin (9) is injected and filled into the gap between the panel (2) and the front plate (5).

After that, the inlet member (6) and the air vent member (sword) are closed, the adhesive resin (9) is cured by ultraviolet irradiation, and finally the front plate (5) of the polyester tape (8) is closed.
Remove the convexly bent part of the front plate (
By cleaning the surface of step 5), an explosion-proof cathode ray tube is manufactured.

As mentioned above, conventional explosion-proof cathode ray tubes have a front plate (
5) are attached to the face panel (2) with adhesive resin (9) at intervals corresponding to the height of the spacers (4), so that the cathode ray tube (1) can be reinforced and the cathode ray tube (1) Even if the glass is damaged, disasters caused by broken glass during implosion can be prevented.

[Problems to be Solved by the Invention] However, the ultraviolet curable resin used in the production of conventional explosion-proof cathode ray tubes as described above is of a so-called photopolymerizable composition type, and mainly contains monomers such as methyl methacrylate. , a binder polymer (prepolymer) such as polyvinyl alcohol, and a polymerization initiator such as benzoin ether. However, the polymerization initiator is photolyzed by ultraviolet irradiation, generating radicals and polymerizing the monomer, so the density of the resin increases due to ultraviolet irradiation, and the resin shrinks after curing. As a result, there has been a drawback that in the peripheral area where the adhesion to the face panel is poor, peeling occurs between the front plate and the adhesive resin due to distortion due to shrinkage.

Therefore, the present invention was made to solve the above-mentioned problems, and it is possible to manufacture an excellent explosion-proof cathode ray tube without peeling between the front plate and the adhesive resin, which was a bottleneck in manufacturing. The purpose is to provide a method.

[Means for Solving the Problems] The present invention provides a method for bonding a protective glass plate for explosion-proofing using an ultraviolet curable resin on the front surface of a luminescent screen of a cathode m-tube. The present invention relates to a method for manufacturing an explosion-proof cathode ray tube, which is made of a polymer compound having a group.

[Function] In the polymer compound having a photosensitive group of the present invention, the photosensitive group is activated by ultraviolet irradiation, and a crosslinking effect is caused in the activated photosensitive group portion. However, compared to conventional adhesive resins in which monomers polymerize to form a polymer compound and cure, the difference in density before and after curing is extremely small because it is a crosslinking reaction between polymer compounds, and therefore the resin itself shrinks. is very small.

[Example 1] Next, a method for manufacturing an explosion-proof cathode ray tube according to the present invention will be described in detail, but the present invention is not limited to this example.

Example 1 A photosensitive resin having the structure of the formula: epoxy resin Go obtained by condensation polymerization of epichlorohydrin and bisphenol A as an ultraviolet curable resin is esterified with cinnamic acid to have a photosensitive cinnamoyl group pendant in the resin. I obtained a synthetic epoxy resin.

The obtained photosensitive epoxy resin was irradiated with ultraviolet rays having a wavelength of 250 to 400 nm for 60 minutes using a chemical lamp to cure the photosensitive epoxy resin.

The shrinkage rate of the cured photosensitive epoxy resin was determined from the density difference of the resins and was 1.0%.

No peeling occurred at the interface with the front plate.

Example 2 Using polyvinyl alcohol containing a styrylpyridium compound represented by Natsushi CH2-C1l+- as an ultraviolet curable resin, the photosensitive epoxy resin was cured by irradiating it with ultraviolet rays with a wavelength of 250 to 400 nm for 30 minutes using a chemical lamp. I let it happen.

The shrinkage rate of the cured epoxy resin was determined from the difference in resin density and was 0.7%, and no peeling occurred at the interface with the front plate.

Comparative Example 1 An explosion-proof cathode ray screen was prepared in the same manner as in Example 1, except that a conventional ultraviolet curing resin consisting of 80 parts of methyl methacrylate monomer, 15 parts of polyvinyl alcohol prepolymer, and 5 parts of benzoin ether as a polymerization initiator was used. Manufactured.

The shrinkage rate of the cured photosensitive resin was determined to be 4.7%, and peeling occurred at the interface with the spacer, and the peeling gradually spread, resulting in no commercial value.

Comparative Example 2 In place of the styrylpyridinium compound and polyvinyl alcohol used in Example 2, 70 parts of methyl methacrylate monomer and 7 parts of polyvinyl alcohol prepolymer were used.
An explosion-proof cathode ray tube was manufactured in the same manner as in Example 2, except that a conventional ultraviolet curing resin consisting of 5 parts and azobisisobutyronitrile was used as a polymerization initiator.

The shrinkage rate of the cured photosensitive resin was determined to be 4%, and peeling occurred from the interface with the spacer and the interface between the photosensitive resin and the injection port member, making it impossible to bond the front plate together. .

In addition, although the above example shows the case where safety protection plates for explosion-proofing are bonded together, the same effect can be obtained when bonding so-called anti-reflection plates that have an anti-reflection plate on the front surface of the protection plates. Needless to say, it plays.

[Effects of the Invention] As described above, according to the method for manufacturing an explosion-proof cathode ray tube of the present invention, the shrinkage rate of the ultraviolet curing resin can be suppressed to 1% or less, so that peeling at the interface with the front plate is prevented. does not occur. Therefore, the front plate can be bonded together with high efficiency, and explosion-proof cathode ray tubes can be produced in large quantities at low cost.

[Brief explanation of drawings]

FIG. 1 is a plan view of the cathode ray tube, FIG. 2 is a front view of the cathode ray tube, and FIGS. 3 to 5 are manufacturing process diagrams taken along the line AA' in FIG. 2. (Drawing codes) (1): Cathode ray tube (2J: Face panel (2a): Front of face panel (2b): Outer periphery of face panel (3): Funnel (4) Varnish spacer (5): Front plate (6) ): Inlet member (7): Air filter member (8): Polyester tape (9): Ultraviolet curing resin Agent Yusai Oiwa Masu 1
Figure, i'2 figure

Claims (1)

[Claims] (1) A method of bonding a protective glass plate for explosion protection to the front surface of a cathode ray tube luminescent screen using an ultraviolet curable resin, characterized in that the ultraviolet curable resin is a polymeric compound having a photosensitive group. A method for manufacturing an explosion-proof cathode ray tube.