JP2548451B2 - Black resin layer transfer sheet and anode forming method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a black resin layer transfer sheet capable of efficiently forming a metal back layer capable of preventing doming and halation of a cathode ray tube, and an anode formation using the same. It is about the method.

2. Description of the Related Art In the manufacturing process of a conventional cathode ray tube anode for a color television, a glass substrate that constitutes a phosphor screen is subjected to an appropriate surface treatment, and then PVA-ammonium dichromate photosensitive liquid is used.
Pattern exposure and development were carried out, a black material such as graphite was flown, and lifted off to form a black matrix layer.

In order to form the phosphor pattern, the steps of applying, drying, exposing, developing and drying a slurry in which a phosphor pigment is dispersed in PVA-ammonium dichromate photosensitive solution are repeated three times to form R, G, and B layers. The process of doing was used.

After further forming the phosphor layer, an organic polymer film containing nitrocellulose or the like is formed in order to obtain a mirror-finished metal film, and then a metal back layer is formed by a vacuum deposition method, a sputtering method, etc. It was fired and decomposed to form a phosphor screen.

Also, in the shadow mask color tube, 15 to 20% of the electron beam normally passes through the shadow mask, causing the phosphor to emit light, and the remaining 80 to 85% of the electron beam collides with the shadow mask and raises the temperature of the shadow mask. As a result, the shadow mask thermally expands and thermally deforms in a convex shape in the panel face direction (this phenomenon is called doming). When this phenomenon occurs, the positional relationship between the mask hole and the face panel shifts, and in extreme cases color Misalignment occurred.

Further, in order to prevent the above doming, the black resin layer is formed on the metal back layer by a spray method or the like for the purpose of suppressing halation.

Problems to be Solved by the Invention The process of forming the above-described anode having a black resin layer has a very long and complicated process and requires a large-sized device, which causes a cost increase.

That is, as a countermeasure against doming and halation, if a black resin film is formed on the back surface of the aluminum film of the metal back layer, it is easy to absorb the radiant heat from the mask at the time of image output and the heat reflection from the aluminum surface is reduced. The temperature rise is suppressed. Therefore, the doming level can be improved and the black floating level can be improved.

However, in this case, if the coating state of the black resin layer is not uniform, a large difference occurs in the electron beam transmission efficiency,
For this reason, uneven brightness is caused.

Conventionally, the black resin layer is generally formed by applying an acrylic emulsion onto the metal back layer by spraying or the like to form a barrier layer and then applying a graphite slurry from above onto the graphite layer to form a graphite film. Since this is a general method, the thickness of the black resin layer obtained tends to be non-uniform. Therefore, for example, in the thick film portion of the black resin layer, the organic portion contained therein is not smoothly discharged when the phosphor screen is baked, which causes the aluminum film of the metal back layer to swell.

The swelling of the metal back layer and the rupture of the swelling are
The cause is the pressure of the decomposition gas of organic substances generated from the lower surface of the metal back layer during firing.

Means for Solving the Problems Means for solving the above problems are as follows.

A black resin transfer sheet is formed by applying a black resin layer on a substrate sheet having a good releasability in the presence of a resin containing a black substance. Then, the black resin layer on the black layer transfer sheet is transferred onto the metal back layer. After the metal back layer having the black layer is formed by transfer, the organic material is fired to form the anode.

Action The action of the above means is as follows.

By coating, it is possible to easily form a black resin layer having a uniform thickness on the substrate sheet and having an arbitrary thickness.

The black resin layer of this black resin transfer sheet is pressed against a metal back layer on a glass substrate such as a face plate via an adhesive layer, and then the substrate sheet is peeled off. Peeling occurs between the layers and the black resin layer is transferred to the metal back layer side.

If a depolymerizable material is selected as the material of the transferred black layer, it is thermally decomposed by rapid heating in the firing step, and only the black substance remains on the metal back layer.

As a result, the swelling of the metal back layer or the rupture of the swelling is completely prevented.

According to the above means, a black resin layer having a required thickness can be easily and uniformly applied and formed on the support surface, and a black resin layer having no thickness unevenness can be easily formed on the surface of the metal back layer.

Examples Hereinafter, a black resin layer transfer sheet of the present invention, a method for producing the same, and a method for forming an anode will be described with reference to the drawings.

First Embodiment The outline of this embodiment will be described first, and then the details will be described.

FIG. 1 is a sectional view of an essential part of an embodiment of a black resin layer transfer sheet of the present invention.

In FIG. 1, 1 is a support having excellent mechanical strength and solvent resistance, and various resin films such as polyethylene terephthalate, polyimide, polyamide, polyethylene, polypropylene are used, and the thickness of the film is 3-10
The range of 0 μm, preferably 5 to 50 μm is suitable.

Reference numeral 2 denotes a release layer formed on the substrate sheet, and a thin layer made of a material having excellent release properties such as silicone, fluorine, acrylic, and wax is used.

However, if the transferability of the black resin layer is good, the release layer is not always necessary.

3 is a black resin layer, which is a thin black resin layer of 2 to 3 μm containing graphite and carbon. As the binder for the black resin layer, a depolymerizable resin is used, and acrylic resin is preferable.

In this way, the black resin layer transfer sheet 5 is formed.

2 shows that the black layer transfer sheet 5 shown in FIG. 1 is pressed against the black stripes 8, the phosphor layers 9 and the metal back layer 6 formed on the glass substrate 7 via the adhesive layer 4, The substrate sheet 1 having the release layer 2 is peeled off,
The black resin layer on the black layer transfer sheet 5 is replaced with the metal back layer 3
Shown is the state of the transfer.

The black resin layer 3, which will be described in detail later, has good adhesiveness to the metal back layer 6, and to the release layer 2,
Since the adhesiveness is extremely weak, the black resin layer 3 is separated from the release layer 2 and transferred onto the metal back layer 6. Thus,
An anode having the intended black resin layer 3 is formed on the metal back layer 6.

 The present embodiment will be described in more detail below.

The thickness of the substrate sheet 1 is usually about 3 to 100 μm, preferably 5 to 50 μm, and 25 μm in this embodiment.

The adhesive layer 2 is formed by applying silicon resin to a thickness of 1 μm.

The black resin layer 3 was obtained by adding 50 parts by weight of graphite having an average particle size of 1 μm, 5 parts by weight of carbon black, and 1000 parts by weight of toluene as a solvent to 100 parts by weight of the acrylic resin as a base material, and using a homomixer. The coating material obtained by kneading for 20 minutes was applied to the release layer 2 on the substrate sheet with a wire bar.
It is applied to the surface to a thickness of 2 μm after drying.
On the black resin layer 3, an acrylic resin (isobutyl methacrylate) as an adhesive 4 is applied to a thickness of 3 μm.

As shown in FIG. 2, the black resin layer 3 formed on the release layer 2 is pressure-transferred onto the metal back layer 6, the support 1 is peeled off, and the black resin layer 3 is formed on the glass substrate 7. Formed an anode having.

For comparison with this example, an anode prepared by a conventional spray method (hereinafter, this anode is referred to as a comparative example) was prepared.

The anodes of this example and comparative example obtained as described above were fired at 450 ° C. for 1 hour in order to remove organic components.

As a result, in the case of the present embodiment, the organic substances contained in the adhesive layer 4 and the like are completely burned and thermally decomposed, and the aluminum film which is the metal back layer has no swelling at all, which is extremely high. A good surface condition was maintained, and the binder of the black resin layer was completely pyrolyzed to form a black layer of graphite or the like, and a good anode was obtained.

On the other hand, in the anode of the comparative example, large swelling occurred in a part of the aluminum film, and some of the swelling resulted in rupture. A possible cause of this is uneven thickness of the black resin layer.

As described above, in this example, the black resin layer has a uniform thickness and can be controlled to the minimum thickness of the required black layer, while the black layer is formed by the spray of the comparative example. In this method, it is difficult to control the thickness, and the thick portion is damaged such as swelling burst.

The metal film obtained in this example has sufficient characteristics as a metal back layer of a cathode ray tube, and further, due to the effect of a black layer such as graphite, doming is suppressed, and secondary electrons are also contained in the black layer. Was absorbed into the film and an extremely clear image was obtained.

In this embodiment, after forming a phosphor screen on a glass substrate by a conventional technique, an organic film is formed for smoothing the surface of the phosphor layer, and the glass substrate is introduced into a vapor deposition apparatus to perform aluminum vapor deposition, Further, as compared with the conventional process in which the black resin layer is sprayed on the aluminum film to form the black layer, the number of steps and the cost can be significantly reduced.

It was also confirmed that a good metal back layer can be obtained even when the metal film is nickel.

When the adhesiveness of the substrate sheet to the black resin layer is extremely poor, the black resin layer is transferred without forming a release layer. Furthermore, a part of the black resin layer may be transferred by causing cohesive failure in the black resin layer.

Second Example A silicon film having a thickness of 1 μm was applied on a substrate sheet 1 of a PET film having a thickness of 12 μm to form a release layer 2.
On this release layer 2, a black resin layer 3 having the following composition was applied to a thickness of 3 μm.

The above-mentioned black layer transfer sheet was pressure-bonded via an adhesive layer (acrylic resin) formed on the metal back layer on the fluorescent surface formed on the glass substrate to prepare a metal back having a black layer. Then, it was fired at 450 ° C., and the optical characteristics such as doming and halation were measured as an anode of the cathode ray tube, and good results were obtained. Further, no blisters were observed in the metal film after firing, and the adhesion strength of the black substance to the metal film was satisfactory.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, it has become possible to form a black resin layer having an extremely uniform thickness, which has been experienced so far.

Further, according to the present invention, the metal back layer can be formed with a high yield, and the black resin layer formed on the metal back layer suppresses the doming phenomenon and further contributes to secondary electron countermeasures, thereby significantly improving the image quality. Can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a black resin layer transfer sheet of the present invention, and FIG. 2 is a process diagram of forming an anode using the black resin layer transfer sheet of FIG. 1 ... Support, 2 ... Release layer, 3 ... Black resin layer, 4 ... Adhesive layer, 6 ... Metal back layer, 7 ... Face glass, 8 ... Black stripe, 9 ... Phosphor layer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Noboru Aikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-3-254040 (JP, A)

Claims (7)

(57) [Claims] 1. A black resin layer transfer sheet comprising a black resin layer transferred on a metal back layer formed on a phosphor layer on a sheet. 2. The black resin layer transfer sheet according to claim 1, wherein the black resin layer contains at least graphite and carbon. 3. The black resin layer transfer sheet according to claim 1, wherein the binder contained in the black resin layer is a depolymerizable organic material. 4. The black resin layer transfer sheet according to claim 1, wherein the binder is an acrylic resin. 5. The black resin layer transfer sheet according to claim 1, wherein a release layer is interposed between the sheet and the black resin layer. 6. The black resin layer transfer sheet according to claim 1, wherein the black resin layer on the black resin layer transfer sheet is attached to a metal back layer on a glass substrate via an adhesive. A method for forming an anode, which comprises pressing and then peeling the black resin layer transfer sheet between the sheet and the black resin layer to transfer the black resin layer onto the metal back layer. 7. The method for forming an anode according to claim 6, wherein the adhesive is a depolymerizable material.