JPS61142629A - Cathode-ray tube and manufacture of the same - Google Patents

Abstract

PURPOSE:To make easy the bonding work and improve productivity and bonding property by using unsaturated ester as the bridge agent of bonding agent used for bonding the non-reflective transparent plate to the face plate and adjusting viscosity of bonding agent before it is hardened to a lower value. CONSTITUTION:Content of unsaturated ester of bridge agent is adjusted to the range of 5-15wt% so that viscocity of bonding agent 3', before it is hardened, for bonding the non-reflective transparent plate 14 to the face plate 2 of the CRT is within the range of 1.5-6.0. The bonding work for the face plate 2 and non-reflective transparent plate 4 can be done esily and productivity and bonding property can also be improved by adjusting viscocity of unsaturated ester to the range of 2.0-3.0 at 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cathode ray tube in which a front non-reflection transparent plate is bonded to the face plate portion of a cathode ray tube body, and a method for manufacturing the same.

[Background of the invention]

Conventionally, this type of bonded cathode ray tube with a non-reflective transparent plate (hereinafter referred to as glass) has a face plate portion 2 of a cathode ray tube body 1 made of unsaturated polyester resin, epoxy resin, or silicone resin, as shown in FIG. A front non-reflective glass 4 was adhesively disposed with an adhesive 3 such as the like interposed therebetween.

The structure of a cathode ray tube in which glass is bonded to the front surface of the face plate is, for example, the structure of the Japanese Utility Model Publication No. 48-425.
It is described in detail in Publication No. 28 and the like.

However, from the table, in a cathode ray tube configured as described above, if an unsaturated polyester resin (the main resin is unsaturated polyester and the crosslinking agent is styrene) is used for the adhesive 3, the cost of the adhesive 3 will be low. The resin viscosity during adhesion is 2.
At 5° C., the temperature was about 6 poise or more, and it was necessary to set the preheating temperature of the resin liquid and the face plate portion 2 high to prevent molding. On the other hand, the viscosity can be lowered by increasing the amount of styrene added, but when the amount of styrene added increases, it polymerizes alone in addition to reacting with the unsaturated polyester main chain to produce polystyrene. However, while the refractive index of cured unsaturated polyester resin is in the range of 1.5O-L54, the refractive index of polystyrene is 1.55 or more, and a difference in refractive index occurs between the two. As a result, the cathode ray tube was activated and the phosphor screen emitted light! This difference in refractive index causes a phenomenon in which the screen projected on the front non-reflective glass 4 sparkles (9parkl/varnish sparkle), resulting in a problem of deterioration of image quality. Further, when the viscosity is lowered by lowering the molecular weight of the unsaturated polyester, there is a problem in that the adhesive strength is lowered and the front non-reflective glass 4 becomes easily peeled off. Furthermore, when an epoxy resin is used for the adhesive 3, there are problems in that the adhesive 3 becomes expensive and turns yellow due to ultraviolet rays after long-term use, reducing image quality. Ta. Maku,
When a silicone resin is used, there is a problem in that the front non-reflective glass 4 easily peels off because the silicone resin has hygroscopic properties.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to adjust the viscosity of the adhesive before curing to a low level to facilitate the bonding work between the face plate portion and the non-reflective glass. An object of the present invention is to provide a cathode ray tube that is easy to manufacture and has improved productivity and adhesiveness, and a method for manufacturing the same.

Another object of the present invention is to provide a cathode ray tube and a method for manufacturing the same, which prevent the generation of sparkles by adjusting the refractive index difference between the main agent and the crosslinking agent constituting the adhesive, and provide a high-quality image. It is about providing.

[Summary of the invention]

In order to achieve such an object, the present invention uses an unsaturated polyester main chain as an adhesive as a main ingredient, styrene and an unsaturated ester as a crosslinking agent, and sets the viscosity of the adhesive before curing to 1.5 to 6.0. This is to adjust to the poise range.

In addition, in the manufacturing method of the present invention, anti-reflective glasses are disposed facing each other with a gap interposed in the face plate portion, and the gap is formed by an unsaturated polyester main chain, styrene, and an unsaturated ester. When a resin liquid adjusted to within the range of 6.0 poise is injected and heat treated, the face plate portion and the non-reflective glass are bonded and solidified.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

FIG. 2 is a sectional view of essential parts showing an embodiment of the cathode ray tube according to the present invention. In the figure, the face plate portion 2 of the cathode ray tube body 1 has a phosphor screen 1b on the inner surface of the panel 11, and a shadow mask 1C and an electron gun structure 1d facing the phosphor screen 1b. Approximately 65vt$ chain and approximately 25vt styrene as crosslinker.
A non-reflective glass 4 is bonded and disposed with an adhesive containing about IQvt% of an unsaturated ester having a molecular weight of 200 to 1000, such as diptyl maleate, for example.

In this case, as the unsaturated ester, in addition to diptyl maleate, for example, maleic acid ester, hexamalic acid ester, etc. are suitable. In this case, the adhesive 3' is prepared by adding diptyl maleate having a molecular weight of 228 as a crosslinking agent (K), and applying cathode rays to the resin liquid whose viscosity before curing is adjusted to about 25 poise at 25°C. It is injected between the tube body 1 and the non-reflective glass 4 and hardened.

In such a configuration, the adhesive 3' has an unsaturated polyester main chain as a main ingredient and a resin liquid before curing.

Since it is composed of styrene and diptyl maleate with a molecular weight of 228 as a crosslinking agent, the viscosity is 25.
Since the resin liquid is adjusted to the above-mentioned gap G
Fills every nook and cranny with adhesive strength.

Curing can be performed by lowering the preheating temperature without changing the curing temperature. Further, when the preheating temperature is lowered, the amount of curing agent added can be increased, so that curing can be performed at low temperature and in a short time.

In addition, in such a configuration, the adhesive 3' has an unsaturated polyester main chain as a main ingredient, a refractive index L50°, styrene as a crosslinking agent, a refractive index of 1.54, and diptyl maleate, a refractive index of 1.45. Moreover, since diptyl maleate has a double bond in its molecule, it prevents the polymerization of only styrene alone, that is, the formation of polystyrene (refractive index: 1.55 or more), and the combination of diptyl maleate and styrene is prevented. will be polymerized. As a result,
The refractive index of the polymer of styrene and diptyl maleate is approximately 1.504 degrees, which is adjusted to a value close to the refractive index of the unsaturated polyester main chain, 1.50. Therefore, there is no refractive index difference within the adhesive 3', and the generation of sparkles caused by this refractive index difference can be reliably prevented.

In addition, in the above-mentioned embodiment, the adhesive 3' consists of an unsaturated polyester main chain of about 65vt$ and a styrene of about 25vt$.
tl and diptyl maleate as an unsaturated ester with a molecular weight of 228 was set at approximately 10vt%, but of these contents, the content of the unsaturated ester with a molecular weight of 228 was determined by the viscosity of the adhesive 3' before curing at 25°C. 1.5-6.0
It is appropriately selected within the range of 5 to 15vt so that it is within the range of . In other words, if the viscosity before curing is less than 1.5 poise, the preheating temperature can be lowered, but the resin liquid is more likely to leak and the curing temperature must be raised, which is dangerous and reduces workability. It's inappropriate. Furthermore, if the viscosity exceeds 6.0 poise, it becomes difficult to mold unless the preheating temperature is set high, and the viscosity thickens quickly, reducing workability. Furthermore, if it is injected at a high viscosity, air bubbles will not come out and uneven curing will occur, resulting in a decrease in quality and reliability as in the conventional structure. Therefore, the content of the unsaturated ester is adjusted to be in the range of 5 to 15 tqb so that the viscosity of the adhesive 3' before curing is in the range of 1.5 to 6.0. By adjusting the content of this unsaturated ester to have a viscosity in the go-ao range at 25° C., it becomes possible to cure the adhesive with stable quality and to widen the working margin. In particular, very good effects can be obtained by setting the viscosity to 25 poise.

Next, a method for manufacturing the cathode ray tube constructed as described above will be explained.

FIGS. 3 and 4 are diagrams for explaining the method of manufacturing a cathode ray tube according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. First, as shown in FIG. 3, a spacer 5 is placed on the periphery of the face plate part 20 with the face plate part 2 of the cathode ray tube body 1 facing upward, and then a non-reflective glass 4 is placed on top of the spacer 5. It is arranged to face part 2. Next, a tape 6 made of a synthetic resin material is wrapped around the non-reflective glass 4 and the panel 1a of the cathode ray tube body 1. At this time, a gap G formed between the non-reflective glass 4 and the face plate portion 2
An injection port T connected to the tape 6 is provided in a part of the tape 6. Next, the cathode ray tube main body 1 is preheated to about 40C, and as shown in FIG. Saturated polyester resin liquid (unsaturated polyester main chain 6
5wt4. About 25 vt% styrene, about 10 vtl of sifthyl maleate) 9 and cobalt heptathenate housed in the second container 1o were added at about 0.02 v to the resin liquid 9.
t% and Permec N as methyl ethyl ketone peroxide to the resin liquid 9 and a hardening agent 11 consisting of about 3wt1 while heating the dispenser 1 to about 40C.
After supplying a predetermined amount into the tank 2 and sufficiently stirring it by the mixer 13, the liquid is injected into the injection port T using the injection jig, and after filling, the injection lower is sealed. Next, the entire cathode ray tube body 1 is approximately 6
The filled unsaturated polyester resin liquid 9 is cured by heating at 0° C. for about 1.5 hours to adhere the non-reflective glass 4. Thereafter, the injection lower and the excess portion of the tape 6 described above are removed to complete the process.

According to this table method, the viscosity of the adhesive 3' before curing is 2
．． Since the resin liquid 9 adjusted to 5 points and 9 degrees is used, the preheating temperature of the cathode ray tube body 1 and the resin liquid 9 before injection, which was conventionally set at 45 to 50 degrees Celsius, is about 10 degrees lower.
The temperature can be as low as 5 to 40°C. By lowering the preheating temperature, it is possible to increase the amount of curing agent added, so the curing temperature is about 3 hours at about 60℃ at the conventional curing temperature of about 100℃.
This can be significantly reduced to approximately 1.5 hours at ℃, making it possible to cure the adhesive at low temperatures and in a short time.

〔Effect of the invention〕

As explained above, according to the present invention, by adjusting the viscosity of the adhesive before curing to be low by using an unsaturated ester as a crosslinking agent of the adhesive, the preheating temperature and curing temperature can be reduced. Addition of the agent facilitates the bonding work, improves adhesive properties, and improves productivity. In addition, since the unsaturated ester has a double bond, it eliminates the difference in refractive index between the base material and the crosslinking agent, which have significantly different refractive indexes, and ensures the generation of sparkles. It has extremely excellent effects such as preventing the occurrence of high-quality images and providing high-quality images.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an example of a conventional non-reflective glass-bonded cathode ray tube, FIG. 2 is a sectional view of a main part of an example of a non-reflective glass-bonded cathode ray tube according to the present invention, and Fourth
The figure is a diagram for explaining a method of manufacturing a non-reflective glass-bonded cathode ray tube according to the present invention. 1...Cathode ray tube main body, 2...Face plate part, 3'...Glue, 4...Non-reflective fj shirasu 5...Spacer. Agent Patent Attorney Akio Takahashi (-''ゝFigure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A cathode ray tube in which a non-reflective transparent plate is adhered to the face plate portion of a cathode ray tube body with an adhesive interposed therebetween, wherein the adhesive has an unsaturated polyester main chain as a main ingredient and a crosslinking agent. contains styrene and unsaturated ester, and the viscosity of the adhesive before curing is set to be low. 2. The unsaturated ester has a molecular weight of 200 to 1000.
The cathode ray tube according to claim 1, characterized in that the cathode ray tube is an unsaturated ester of. 3. The viscosity of the adhesive before curing is 1.5 at 25°C.
3. The cathode ray tube according to claim 1 or 2, wherein the cathode ray tube is set in a range of 6.0 to 6.0 poise. 4. The viscosity of the adhesive before curing is 2.0 at 25°C.
3. The cathode ray tube according to claim 1 or 2, wherein the cathode ray tube is set in a range of 3.0 to 3.0 poise. 5. The cathode ray tube according to claim 1 or 2, wherein the viscosity of the adhesive before curing is set to 25 poise at 25°C. 6. In a cathode ray tube in which a non-reflective glass is adhered to the face plate portion of the cathode ray tube body using an adhesive, a non-reflective transparent plate is attached to the face plate portion of the cathode ray tube body with gaps at regular intervals. a step of arranging them facing each other; a step of preheating the cathode ray tube body; and a step of preheating a resin liquid and a curing agent made of an unsaturated polyester main chain, styrene and unsaturated ester and adjusted to have a low viscosity, and injecting the same into the gap. and a step of heating the cathode ray tube body to harden the resin liquid and bonding and arranging the face plate portion and non-reflective glass. 7. The unsaturated ester has a molecular weight of 200 to 1000.
7. The method for manufacturing a cathode ray tube according to claim 6, wherein the unsaturated ester is an unsaturated ester. 8. The viscosity of the resin liquid at 25°C is 1.5 to 6.
8. The method for manufacturing a cathode ray tube according to claim 6 or 7, wherein the cathode ray tube is produced in a range of 0 poise. 9. The viscosity of the resin liquid at 25°C is 2.0 to 3.
8. The method for manufacturing a cathode ray tube according to claim 6 or 7, wherein the cathode ray tube is produced in a range of 0 poise. 10. The method for manufacturing a cathode ray tube according to claim 6 or 7, characterized in that the viscosity of the resin liquid is set to 2.5 poise at 25°C.