JPS5922338B2 - Method for manufacturing fluorescent surface of beam index color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a phosphor surface for obtaining a beam index signal for a beam index type color picture tube.

As shown in FIG. 1, the beam index type color picture tube uses a metal backing made of aluminum or the like provided inside a band-shaped three primary color phosphor 2 coated on the inner surface of the picture tube panel 1 in order to obtain a beam index signal. On top of layer 3,
It has a fluorescent material 4 for detecting a band-shaped index signal.

The red R of the three primary color phosphors 2 is applied to the band coating pitch that intersects the electron beam e of the index signal detection phosphor 4.
One pitch method in which one index signal detection phosphor 4 is applied to the first pitch of green, blue, and blue; three phosphors are applied corresponding to each of the three primary color phosphors 2R, G, and B. Pitch method, the relationship between the two pitches of the three primary color phosphors and the four pitches of the index signal detection phosphor is a non-integer, for example, IL.
There are pitch, 3/4 pitch force types, etc.

The index light output signal Z obtained by stimulating these index signal detection phosphors 4 with an electron beam e is passed through a peephole provided in the funnel part of the picture tube and sent to a photoelectric conversion tube provided outside the funnel. The position of the three primary color phosphors 2 is predicted and the colors are synchronized.

The method for manufacturing the fluorescent surface of the beam index color picture tube described above is almost the same as that of the fluorescent surface of the normal shadow mask color picture tube.
, B, and R, in the order of three primary color band-like phosphors 2, an organic base layer 5 such as acrylic resin, and an aluminum metal back layer 3 by vacuum deposition, and then, on the back side of the aluminum metal back 3, polyvinyl, alcohol, and heavy A suspension of the index signal detection phosphor 4 containing a photosensitizer such as ammonium chromate is spin-coated and dried, then fluoresced using the same mask used to bake the three primary color phosphors 2, and immediately It is developed with water and the unsolidified portion is washed away to form a linear group of phosphors 4 for index signal detection.

However, in the conventional method of forming a phosphor for index signal detection as described above, the film of the aluminum metal bag 3 is directly washed with water during development, so the film of the aluminum metal bag 3 may be damaged. development water pressure must be made as weak as possible.

Therefore, a sharp linear group of index signal detection phosphors 4 is not formed, and as a result, as shown in FIG. 2, the adjacent signals l and i are not completely independent, resulting in unclear distinction. This method has the disadvantage that only a noisy index signal can be obtained.

In addition, since both the aluminum metal back layer 3 and the organic base layer 5 are extremely thin, they cannot block the penetration of water, and when the suspension is applied, the organic base layer 5 for the metal back is easily destroyed by the water that has entered. Occurs under severe dry conditions,
Further, there is a drawback that the minute particles of the index signal detection phosphor 4 pass through the aluminum metal back film 3 together with water, reducing the color purity of the three primary color phosphors 2.

The present invention provides a fluorescent manufacturing method that eliminates the above-mentioned disadvantages.

That is, according to the embodiment of the present invention, as shown in FIG. 3, a metal back layer 3 made of aluminum or the like is coated with a water-resistant acrylic emulsion film 6 or a silane compound water-resistant film 6 in advance. The layer 3 is protected by the phenomenon of linear group formation of the phosphor 4 for detecting the index signal, and at the same time, the phosphor 4 for detecting water and the index signal is protected by the film of the aluminum metal back 3, the organic base layer 5 and the trichromatic fluorescer. This prevents the light from penetrating into the light body 2.

Embodiments of the present invention will be explained in more detail below with reference to FIGS. 3 and 4.

In FIG. 3, band-shaped phosphors 2 of three colors, red, R, green, and blue, are coated at regular intervals on the inner surface of a panel 1 forming a color picture tube envelope.

Subsequently, an organic base layer 5 is attached on the band-shaped phosphor 2 obtained as described above, and aluminum is vapor-deposited to form a metal back layer 3.
form.

Further, on this metal back layer 3, that is, on the surface on the electron beam scanning side, an organic coating 6 made of acrylic emulsion is applied.
form.

The most suitable acrylic emulsion for the embodiments of the present invention is AC-61 (trade name) manufactured by Rohm & Haus.

This acrylic emulsion AC-61 is formed into a film by thermal polymerization at a temperature of 18° C. or higher.

The resulting film is extremely hard, dense, and has excellent water and alkali resistance.

Other AC-61 is not water resistant, but the company's C-72 (
Effective for acrylic emulsions such as product name).

That is, a 1% to 10% aqueous solution of the above-mentioned acrylic emulsion is prepared, spin coated on the panel after the aluminum metal backing is finished, and immediately spin at high speed to make the film uniform and shake off the excess.

At the same time, rapid heating is performed to cause thermal polymerization to form an acrylic resin film on the aluminum metal back.

The faster the thermal polymerization rate and the higher the solids content of the aqueous solution, the more excellent the water resistance can be obtained.

Subsequently, the index signal detection phosphor 4 and PVA,
After applying a suspension of the above-mentioned phosphor made of ADC-based photosensitizer or the like and drying the film, it was exposed to light using the same mask used for the three primary color phosphors 2, and developed with water. For example, a band-shaped phosphor for index signal detection is obtained, matching the red-band phosphor.

According to this method, the organic coating prevents water from penetrating under the metal back during development and protects the metal back layer, making it possible to increase water pressure.

Therefore, development with sharp edges of the band-shaped phosphor becomes possible, and sharp linear groups can be obtained.

In the example, an acrylic emulsion film was used as the organic film 6, but CHs Si (0CH3)s, C
A similar effect can be obtained by using a silane compound coating such as H35ic13.

As described above, according to the present invention, it is possible to obtain a beam index type phosphor surface that can separate index signals well and prevent a decrease in color purity, and the effects thereof are excellent.

[Brief explanation of the drawing]

Figure 1 shows the coating state of the fluorescent surface of a conventional beam index color picture tube before baking, and Figure 2 shows the beam index signal obtained from the light direction of the conventional beam index color picture tube. FIG. 3 is a diagram showing the coating state of the fluorescent surface of the beam index color picture tube according to the present invention before baking, and FIG. 4 is a diagram showing the beam index produced by the fluorescent direction manufacturing method of the present invention. FIG. 2 is a diagram showing a beam index signal obtained from a fluorescent surface of a power-type color picture tube. 1... Panel, 2... Fluorescent material, 3...
... Metal back layer, 4 ... Fluorescent material for beam index signal detection, 6 ... Acrylic emulsion coating.

Claims (1)

[Claims] 1. In a method for manufacturing a fluorescent surface of a beam index type color picture tube, in which a fluorescent material for detecting an index signal is applied on the surface of the metal back layer on which the electron beam is scanned, a fluorescent material for detecting the index signal is applied on the metal back layer. 1. A method for manufacturing a fluorescent surface of a beam index type color picture tube, which comprises forming a film of an acrylic emulsion or a silane compound on the metal back before coating the metal back.