JPS6020426A - Phosphor printing method - Google Patents

Abstract

PURPOSE:To improve the productionability considerably by forming black stripes on one face of a glass plate then printing R, G, B phosphors alternatively in the gaps to produce a phosphor screen. CONSTITUTION:Print inks 2, 3, 4 of phosphors R, G, B are fed to a plurality of phosphor stripe grooves in a gravure print 8, then a rubber branket 5 is moved over the gravure print 8 to transfer each phosphor stripe 2', 3', 4' simultaneously to the rubber blanket 5 which is compression moved over a glass plate 6 thus to print each phosphor stripe 2'', 3'', 4'' simultaneously onto a glass plate 6 pre-formed with black stripes then thermally hardened under the condition of 150 deg.CX10-20min. to complete printing. Consequently, only one gravure print is required to simplify adjusting of positional accuracy of stripes while print inks can be hardened at once to improve the productionability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cathodoluminescence display tube 2 in which a fluorescent surface is excited by an electron beam emitted from a cathode to emit light in video information equipment such as a fluorescent display tube and a cathode ray tube. The present invention relates to a novel phosphor printing method that can be used for display devices.

Structure of conventional examples and their problems Conventionally, as typified by the fluorescent surface of cathode ray tubes, the method of forming sibrax drives and phosphor stripes was by optical printing method based on coating, exposure, and development. be. Post-processing includes coating with lacquer and vapor deposition of aluminum to produce a fluorescent surface.

On the other hand, in recent years, printing methods have been researched and developed as a method for producing phosphor surfaces, particularly as a method for forming graffiti stripes and phosphor stripes. Screen printing is a typical printing method, but blank drives and phosphor stripes are extremely narrow, ranging from tens to hundreds of microns in width.
Furthermore, the spacing between them is also inappropriate. Moreover, especially
Since phosphor stripes require not only 1) precision but also thickness precision, the screen printing method used for forming thick film circuits cannot be used at all. That is, the luminance of the phosphor becomes insufficient, and the white balance and color purity deteriorate. Since the substrate to be printed is a hard and rigid material such as glass, research is being conducted on the Grapua offset printing method and the Tambo printing (octopus printing) method, which are based on the offset printing method.

Purpose of the Invention The purpose of the present invention is to provide a phosphor stripe with good dimensional accuracy in terms of width and thickness, with no missing phosphors and sufficient luminance, and with a high white color purity. The object of the present invention is to provide a phosphor printing method with good ηr.Another object of the present invention is to use the printing method to greatly improve productivity compared to conventional optical printing methods.

Structure of the Invention In the present invention, as a printing method, a phosphor stripe is formed in a gravure offset printing method. The black stripe is gravure offset 1-
Either printing method or offset printing method can be used. On the other hand, there is also a tampo printing method in which the printing material is formed in a concave curved shape, but it has major drawbacks such as a small printing area and poor printing accuracy, and is therefore unsuitable. Therefore, in the structure of the present invention, first, a black stripe is formed on one side of a flat glass plate as a printing medium by a gravure offset printing method or an offset printing method. next,
Each phosphor R and G was printed in the gap between the black stripes using a gravure offset printing method.

A fluorescent surface is produced by printing B' (H) alternately.

Then, as post-processing, lacquer liquid application and aluminum vapor deposition are applied to complete the process.

DESCRIPTION OF EMBODIMENTS The content of the present invention is that in order to form phosphor stripes with high precision in its configuration, first, each phosphor printing ink was alternately and sequentially supplied to a gravure plate having a plurality of stripe grooves. This is a phosphor printing method using a gravure offset printing machine, characterized in that each of the phosphor printing inks is then simultaneously transferred onto a rubber plunket surface, and further transferred simultaneously onto a substrate surface.

More specifically, the following method is generally used to form phosphor stripes using this gravure offset printing method.

That is, among each fluorescent stripe, a gravure plate having a plurality of stripe grooves for supplying one type of fluorescent printing ink is first supplied with one type of fluorescent printing ink, for example, fluorescent R printing ink, and then rubber is applied. It is transferred onto a blanket surface and finally onto a printing substrate, such as a flat glass surface, and cured by ultraviolet light or heat to form phosphor R stripes. next,
The gravure plate or the flat glass plate that is the printing target is moved, and at the same time as the fluorescent R stripes are formed, for example, fluorescent G printing ink is supplied to the gravure plate, and then transferred onto the rubber plate surface. Further, the phosphor G stripes are transferred onto a flat glass surface, and the material is cured by ultraviolet rays or heat to complete the process. In the same manner, the formation of phosphor B stripes is completed.

On the other hand, as an embodiment of the present invention, the phosphors R, G
, B on a gravure plate having a plurality of striped grooves,
After supplying each fluorescent printing ink alternately and sequentially, at the same time,
The most important feature is that it can be transferred onto the rubber blanket surface and also onto the glass surface at the same time. .

Depending on the size, there are the following advantages.

(1) In order to adjust the position of each phosphor stripe, it is not necessary to move the gravure plate or printing substrate with high precision.

(2) There is no need for multiple gravure plates, ie, one for each phosphor stripe.

(3) After printing, each phosphor stripe can be cured at once, which is economical.

In the present invention, the gravure plate includes aluminum,
A metal plate made by etching a metal plate such as copper can be used. Moreover, a roll-shaped metal roll can also be used. Furthermore, if high striping accuracy is not required, a resin plate can also be used. 1. As the fluorescent printing ink, either an ultraviolet curing type or a thermosetting type can be used. The latter thermosetting type printing ink was used in the present invention. On the other hand, the printing machine may be either a gravure offset printing machine or an automatic offset proofing machine.The materials and printing equipment used in the embodiments of the present invention will be described below.

(1) Printing Ink Plaque Printing Ink Specifications Nigella Eye 1- (Reagent: manufactured by Hanui Kagaku ■) 20wt%, Vehicle (alkyd resin and phenolic resin) s□wt%, Diluent (toluene: manufactured by Hankai Kagaku ■) Small amount of fluorescence Body printing ink specifications: each phosphor (reagent, synthetic ophtonics) eowt%, vehicle (alkyd resin and 7-enol resin) 4wt%, diluent (1-luene:
Relative viscosity: 5o
O~3oo.

(2) Gravure plate A 1 mm thick copper plate was coated with 1 to 2 microns of photosensitizer, and after drying, a predetermined phosphor stripe grooved turn film was placed in a vacuum and ultraviolet rays were applied. Irradiate and harden. Next, it was etched by spraying with an etching solution of ferric chloride (concentration: 42 wt%), washed with pure water, and dried.

(3) Printing machine Since the gravure offset printing machine is a custom-made product and is not commercially available, printing was carried out using an automatic offset/gutter proofing machine (Ouchihon Screen Manufacturing ■B: 1cy-123 series).

(4) Rubber blanket The rubber plaque and gutter attached to the printing machine include:
The following were used.

Rubber blanket (manufactured by Kinyosha ■: Metal Shower M)
46) On the other hand, as a flat glass plate, 250 mm x 200 mm x
Soda glass (manufactured by Nippon Special Glass) with a thickness of 3 to 4 mm was used.

The printing conditions during gravure off-hit printing are as follows: (1) The transfer conditions of the printing ink from the gravure plate onto the rubber planket surface are Q, 2mπ (plate pressure), (2) From the rubber planken 1-side When the transfer conditions of the printing ink onto the flat glass surface were o, 1 mm (printing pressure), both the stripe precision of the phosphor stripe and the black stripe, that is, the stripe reproducibility, was the best.

Under the above conditions, each fluorescent printing ink was supplied to a copper gravure plate, and then transferred onto the comb blank surface.
Furthermore, it was transferred onto a flat glass surface and the stripe width was 16.
0~180μ, /(1--yia'thickness: 10~20
μ phosphor stripes could be formed by gravure offset printing. And heat curing condition = 150″
After sufficiently curing with CX for 10 to 20 minutes, the luminescent characteristics of the phosphor were confirmed using an iUV lamp (manufactured by Toshiba ■). Also,
After applying lacquer and depositing aluminum to create a fluorescent surface, 1
The anode voltage was set to 4 in a vacuum of 0-7 to 1 O-8 tOrr.
When excited with an electron beam under conditions of ~10 KV, the luminance was sufficient, and the color purity and white balance were also good, and it was found to be suitable for practical use.

FIGS. 1 and 2 respectively show an example of forming a phosphor strip I/live by a general gravure offset printing method and an example of forming a phosphor stripe by the gravure offset printing method of the present invention.

In FIG. 1, after a fluorescent R printing ink 2 is supplied to a plurality of fluorescent stripe grooves of a gravure plate 1, a rubber blanket 6 is compressed and moved over the gravure plate 1, and the fluorescent R stripes are 2' is transferred to the rubber blanket 6, and the rubber blanket 5 is compressed and moved over the flat glass 6 to print and form the phosphor R stripe 2' on the flat glass 6, and heat cured at 150''C for 10 to 20 minutes. and complete.

Next, after moving the gravure plate 1 or the flat glass 6, fluorescent G printing ink is printed in the same manner to form fluorescent G stripes. Thereafter, the phosphor B stripes are printed and formed in the same manner to complete the final printing.

In FIG. 2, printing inks 2, 3, 4 of phosphors R, G, and B are applied to a plurality of phosphor stripe grooves of the gravure plate 8.
After supplying each phosphor stripe 2', by moving the rubber blanket 5 over the gravure plate 8,
, 3', 4'i are simultaneously transferred to the rubber blanket 5, and the rubber blanket 6 is further compressed and moved on the flat glass 6, so that each phosphor stripe 2'', 3'', 4'' is simultaneously transferred onto the flat glass 6. Printing and thermosetting conditions: 160°C
The printing is completed by heat curing in 10 to 20 minutes. Note that in FIGS. 1 and 2, 7 is a placket stripe.

Effects of the Invention As described above, according to the present invention, only one gravure plate is required,
It is easy to adjust the positional accuracy of trenches and stripes, and the printing ink can be cured all at once, making it economical. Therefore, the productivity is extremely good, and an extremely high industrial value can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view and a perspective view showing an example of forming phosphor stripes by a general gravure offset printing method, and FIG. 2 is a sectional view and perspective view showing an example of forming phosphor stripes by the gravure offset printing method of the present invention. FIG. 2.3.4... Fluorescent printing ink, 6...
... Rubber plankeno 1-16 ... Printing material, 8.
...Gravure version. Name of agent: Attorney Toshio Nakao and 1 other person 1st
Figure et al? Figure 62

Claims (1)

[Claims] A phosphor R is applied to a gravure plate having a plurality of stripe grooves.
2. After alternately supplying each phosphor printing ink of phosphor G and phosphor B, the phosphor printing ink is transferred onto the rubber blanket surface, and further transferred onto the broken printing surface. A phosphor printing method characterized by: