JPH03250531A - Manufacturing method of front glass adhesive type cathode ray tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a front glass that is effective for preventing implosion of cathode ray tubes for large televisions and for preventing reflection of high-definition display tubes for information processing equipment. The present invention relates to a method for manufacturing a front glass adhesive type cathode ray tube that can be simply and easily adhered to the outer surface of a cathode ray tube panel.

[Prior Art] Japanese Patent Application Laid-Open No. 61-200651 discloses a method in which the inner surface of the front glass is brought close to the outer surface of the panel of a cathode ray tube, a predetermined distance is set between the two, and the periphery thereof is watertightly sealed with an adhesive. A technique has been disclosed in which the space surrounded by the panel, front glass, and sealant is then filled with adhesive and the adhesive is cured, but the sealant is selected to prevent the adhesive from leaking. One of the key points is that silicone resin, which is mechanically strong and satisfies watertight properties, is used as the sealant.

However, if you decide to use a mechanically strong sealant,
It takes a long time to cure, requires heating, and requires a large amount of sealant, which increases the number of man-hours. Additionally, if a mechanically strong sealant is used, when the adhesive is injected and cured, the adhesive will shrink and the bond between the adhesive and the front glass, or between the adhesive and the outside of the panel, may peel off. In some cases, such inconveniences may occur. Additionally, if the sealant is applied widely to the gap between the outer surface of the panel and the periphery of the front glass in order to mechanically strengthen the sealant, the sealant will spread to the display area of the fluorescent surface, making it difficult to see the periphery of the image. occurs.

[Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional problems and provides a method for manufacturing a front glass adhesive type cathode ray tube that does not require the sealant to be mechanically strong. purpose.

[Means for Solving the Problems] In order to achieve the above object, the present invention involves applying a sealant to the periphery of the front glass or the corresponding periphery of the outer surface of the panel, and applying a sealant to the outer surface of the panel. The work of bringing the inner surfaces of the front glass close together and setting a predetermined distance between them, and the work of filling the adhesive into the space surrounded by the panel, the front glass, and the sealant while maintaining the distance are performed in sequence. mosquito,
Alternatively, the work of bringing the inner surface of the front glass close to the outer surface of the panel and setting a predetermined distance between the two, and the work of applying a sealant to the gap between the peripheral edges of the outer surface of the panel and the inner surface of the front glass, respectively;
After filling the space surrounded by the panel, front glass, and sealant with adhesive while maintaining the above distance, the adhesive is cured, and the cathode ray tube is sealed. I decided to glue the front glass to the outside of the panel.

[Function] The above-mentioned sealing agent has two roles. One is to seal the gap between the opposing peripheral edges of the outer surface of the panel and the inner surface of the front glass of the cathode ray tube, and to seal the gap formed inside by this sealing. After the adhesive is injected into the space, watertightness is maintained to prevent the adhesive from leaking from the space until the adhesive hardens.
Another method is to maintain a predetermined distance between the outer surface of the cathode ray tube panel and the inner surface of the front glass after the adhesive is injected and until the adhesive hardens. Both functions are temporary and are no longer needed after the adhesive hardens. Therefore, if the role played by the sealant can be compensated for by other means between the time the adhesive is injected and the adhesive hardens, the sealant will become unnecessary, or It is possible to lower the required characteristics and make it easier to use. In the present invention, one of the two roles that the sealant should play is to maintain the distance between the outer surface of the cathode ray tube panel and the inner surface of the front glass at a predetermined dimension from the time the adhesive is injected until the adhesive hardens. By using a holding jig instead,
Make it unnecessary. If this holding jig is designed to support the cathode ray tube in a specified state and position using the mounting lugs currently attached to all cathode ray tubes, it will be possible to maintain a specified distance between the outer surface of the panel and the inner surface of the front glass. You can also set
The method of using the jig itself becomes extremely simple, and it becomes possible to mechanize the entire work.

If the above method is used, the number of work steps will be reduced, and problems such as peeling between the adhesive and the front glass or between the adhesive and the outer surface of the cathode ray tube panel will not occur, and the sealant will not be applied to the display area of the fluorescent surface. There is no problem in which the edges of the image become difficult to see due to spreading.

Furthermore, by using an ultraviolet curable resin as the adhesive or sealant, it is possible to greatly simplify the curing process. It should be noted that if the ultraviolet curable resin is used as a sealant with a relatively high viscosity, and as an adhesive to be injected into the space later, a relatively low viscosity one is used, and one work process according to the present invention is adopted. can be carried out extremely easily and efficiently.

[Example] Fig. 1 is a partially sectional side view of an example of the present invention.
In the figure, 1 is the front glass, 2 is the cathode ray tube, 3 is the sealant, and 4
5 is an adhesive, 5 is a panel of the cathode ray tube, and 8 is a mounting lug that is tightly attached to the four corners of the panel skirt portion of the cathode ray tube 2 using reinforcing bands to prevent implosion. The embodiment shown here has a completely flat outer panel surface and a completely rectangular (
The four corners are given radii of curvature),
Therefore, the front glass can also be used as a raw material by cutting ordinary window glass material into rectangular shapes. Further, according to the present invention, since the width of the sealant applied to the periphery of the front glass can be narrow, the area of the front glass can be made considerably smaller than the area of the cathode ray tube panel. Significant price reductions can be achieved.

As shown in a perspective view in FIG. 2, a front glass 1 with a thickness of about 3 mm is coated with a multi-layer vapor-deposited film to reduce reflection on its outer surface, and has a width of about 3 mm on three sides excluding the upper edge of the inner peripheral edge. As shown in the figure, a suitably viscous ultraviolet curable resin is applied as a sealant 3 in the form of a strip about 2 cm in height.

Thereafter, the front glass 1 is relatively moved in the direction indicated by the arrow A in the figure, and is set to be close to the cathode ray tube 2 by about 1 mm. At this time, the sealant 3 is crushed and widened, and at the same time seals the gap between the opposing peripheral edges of the front glass 1 and the panel 5 of the cathode ray tube 2 in a watertight manner. In this work, a holding jig 6 shown in FIG. 3 is used. A front glass support jig 7 is provided as a part of the holding jig 6, and supports the front glass 1, which has been coated with a sealant 3 on the inner peripheral edge in advance, using its outer surface and side surfaces as guides. . Next, a cathode ray tube support jig 9 is provided as a part of the holding jig 6 to support the cathode ray tube 2.

In this case, the mounting lug 8 already attached to the cathode ray tube 2 is used to support the weight, support posture, and support position of the cathode ray tube 2. The upper mounting lug 8 is engaged with the upper cathode ray tube support jig 9 so that it will not come off the jig 9 due to the torque caused by gravity acting on the cathode ray tube 2. In this way, the distance from the mounting lug 8 to the outer surface (and therefore to the inner surface) of the front glass 1 is naturally constant 8, which is convenient for mounting the cathode ray tube in the apparatus. The entire holding jig 6 is tilted approximately 20 degrees, and the cathode ray tube 2
The sealing agent 3 is compressed to a thickness of about 1 mm by the component force of the weight. The holding jig 6 has a hole approximately the same size as the front glass 1, as shown by the broken line. Through this hole, ultraviolet rays are irradiated from the right side in FIG. 3 to harden the sealant 3. In this state, next, the inner surface of the front glass 1,
Adhesive 4 (
This is also an ultraviolet curable resin, but its viscosity is considerably lower than that of the sealant 3), which is injected from above and filled. At this time, since the watertightness of the sealant 3 is maintained well, the distance between the front glass 1 and the panel 5 is set to a predetermined value due to the weight of the cathode ray tube 2, and the sealant 3 is crimped. The watertightness will not deteriorate because of this. However, if the holding jig 6 is not used, the front glass 1
Since the distance between the panels 5 and 5 is not maintained and the panel 5 spreads out, and the sealing agent 3 is not pressed, watertightness cannot be maintained and the adhesive 4 leaks. After filling adhesive 4, sealant 3
The adhesive 4 is cured and completed by irradiating ultraviolet rays in the same manner as in the case of . In the above embodiment, the sealant 3 is attached to the front glass 10.
I applied it to the periphery.

The sealant 3 may be applied to the panel 5 side. In addition, after setting a predetermined distance between the front glass l and the panel 5 using the holding jig 6, in that state, apply the sealant 3 from the outside so as to fill the gap between the peripheral edges of both. It may be made watertight by doing so. In order to simplify and facilitate the work process, it is convenient to use an ultraviolet curable resin as the sealant or adhesive, but a thermosetting resin or the like may also be used.

Further, as the sealant 3, double-sided adhesive foamed plastic tape or non-adhesive flexible rubber tape can be used.

[Effects of the Invention] As explained above, according to the present invention, the adhesive is filled while maintaining the distance between the front glass and the panel at a predetermined value using the holding jig, so the peripheral edge can be sealed watertightly. The work is extremely easy because the sealant to be attached does not need to be mechanically strong, and the sealant does not protrude and spread to the periphery of the display portion of the fluorescent surface, making it unsightly.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of an embodiment of the present invention, FIG. 2 is a perspective view for explaining the manufacturing method, and FIG. 3 is a side view for explaining the holding jig according to the present invention. It is a diagram. 1. Front glass, 2. Cathode ray tube, 3. Sealing agent, 4. Adhesive, 5. Cathode ray tube panel, 6. Holding jig, 7. Front glass support. jig,
8th ■ Figure 8 - Manshi right rug

Claims (1)

[Claims] 1. In a method for manufacturing a front glass bonded cathode ray tube in which a front glass is bonded to the outer surface of a panel of a cathode ray tube bulb with an adhesive, the periphery of the inner surface of the front glass or the corresponding periphery of the outer surface of the panel. There are two steps: applying a sealant to the panel, bringing the inner surface of the front glass close to the outer surface of the panel and setting a predetermined distance between the two, and maintaining the distance between the panel, the front glass, and the sealant. 1. A method for manufacturing a front glass-adhesive cathode ray tube, comprising a series of steps of sequentially performing an operation of filling an adhesive into a space with an adhesive and curing the adhesive. 2. In the manufacturing method of a front glass adhesive type cathode ray tube in which a front glass is bonded to the outer surface of a panel of a cathode ray tube bulb with adhesive, there are two steps: bringing the inner surface of the front glass close to the outer surface of the panel and setting a predetermined distance between the two; , Applying adhesive to the gap between the peripheral edges of each inner surface of the front glass, and filling the space surrounded by the panel, the front glass, and the sealant with adhesive while maintaining the distance. 1. A method for manufacturing a front glass-bonded cathode ray tube, comprising a series of steps of sequentially performing an operation and an operation of curing the adhesive. 3. The method for manufacturing a front glass adhesive type cathode ray tube according to claim 1 or 2, wherein at least one of the sealant and the adhesive is an ultraviolet curable resin. 4. When holding the inner surface of the front glass close to the outer surface of the panel and setting a predetermined distance between the two, use the mounting lugs of the cathode ray tube as a reference surface when holding the outer surface of the cathode ray tube panel in a predetermined position. 4. The method of manufacturing a front glass-bonded cathode ray tube according to claim 1, wherein: