JPS5823144A - Formation of fluorescent screen for cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a fluorescent screen, which is provided with thin black-light absorbing parts having a small width and finely-chiseled side edges, by forming residual photosensitive resin layer parts, which restrict the width of the said thin black-light absorbing parts dividedly in two times. CONSTITUTION:After a first photosensitive resin layer 12 is formed by applying a photosensitive resin over a glass panel 11, the layer 12 is subjected to the first exposure carried out through an electron-beam-reaching-position determination mask 13, and is subjected to a development treatment. Next, the unexposed parts of the layer 12 are removed, and the remaining parts of the layer 12 are hardened so as to form stripped first residual photosensitive resin layer parts 12'. Following that, a photosensitive resin is appied over the whole surfaces of the parts 12' to form a second photosensitive layer 16, the layer 16 is subjected to exposure carried out through the mask 13 in the same manner as the first exposure, and a development and a hardening treatment are performed so as to form second residual photosensitive resin layer parts 16'. Next, thin black- light absorbing parts 17' are formed by means of the photosensitive resin layer parts 12' and 16'. After that, phosphors with various emission colors are provided on the parts 17', in order, so as to complete a fluorescent screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a fluorescent surface of a cathode ray tube, and more particularly to a method of forming a fluorescent surface in which a black light absorbing portion is arranged between each color value light body in a color cathode ray tube. ,.

The phosphor surface of a color cathode ray tube is formed by disposing striped or dot-shaped phosphors of each color. A method in which a black light absorbing portion is arranged between live or individual phosphor dots has been proposed.

In forming such a fluorescent surface having a black light absorbing portion, first the black light absorbing portion is formed on the glass panel, and then predetermined color emitting fluorescents are applied to the portion of the glass panel where the black light absorbing portion is not formed. A light body portion is formed.

For example, in the case of a phosphor surface having striped phosphors, a large number of black light absorbing strips of a predetermined width are first formed on a glass panel, and then each color light is emitted between each strip of black light absorbing regions. Fluorescent stripes that emit light are formed one after another. The conventional method for forming such a fluorescent surface will be explained using the process diagram of FIG. 1 and FIG. 2. As shown in FIG. 1A,
A photosensitive resin layer such as polyvinyl alcohol is applied over the entire surface of the glass panel to form a photosensitive resin layer, and an electron beam having a large number of pores and slits is applied to this photosensitive resin layer. Exposure is performed by applying light through a mask for determining the destination position. In this exposure, as shown in FIG. 2, the photosensitive resin layer is first exposed through the slit of the mask 3.
The light 5R that reaches the arrival position of the red light generation electron beam is irradiated, then the light tC that reaches the arrival position of the green light generation electron beam is irradiated, and then the light tC that reaches the arrival position of the blue light generation electron beam is irradiated. This is done by irradiating the light that reaches it. In this case, the light sources for each party, 5-R, , li'G, and sB are not only fixed, but also their respective positions are slightly moved to irradiate each party 5R, 5G, and iB twice. It may also be done in separate sessions. Next, the exposed photosensitive resin layer is developed to remove the areas that were not exposed to more than a predetermined amount of light, and dried, resulting in striped residual photosensitivity as shown in Figure 1B. A resin layer portion 2' is formed.

Next, as shown in FIG. 3C, a black material 6, for example, a mixture of carboxylic acid and water glass, is applied over the entire surface of the exposed portion of the glass panel l and the remaining photosensitive resin layer portion 2'. ,
dry. Then, by treating this with periodic acid (HIOII) or the like to remove the residual photosensitive resin layer 2' together with a part of the black material B applied thereon, the result shown in the first diagram is The black material A remaining on the glass panel 1 forms striped black light absorbing portions 6'.

Thereafter, phosphor stripes for emitting light of each color are arranged between the black light absorbing strips 6' on the glass panel 1 to complete the phosphor surface.

Here, the width of the striped black light absorbing portion 6', the neatness of the side edges,
Uniformity over the entire fluorescent surface is determined by the formation status of the residual photosensitive resin layer 2', and is therefore determined by the light amount distribution characteristics during exposure of the photosensitive resin layer 2 and the development and drying conditions. It will be done. Conventionally, various considerations have been made to the shape and position of the light source in order to obtain desired characteristics regarding the light intensity distribution. ), if the width of each black light absorbing strip 6' is required to be small (for example, 50 μm or less), the mutual influence of light from adjacent slits of the mask during exposure becomes strong. Therefore, this mutual influence is suppressed as much as possible, and the amount of light is suitable for forming well the residual photosensitive resin layer portion 2' of a predetermined width for forming the striped black light absorbing portion 6' of small width. It is difficult to obtain the distribution characteristics, and for this reason, it is difficult to obtain the narrow black light absorbing portion 6 with a small width.
It was difficult to form a fluorescent surface having a good condition.

For example, when exposing with a fixed light source, the light intensity distribution at each exposed area in the center of the glass panel will be as shown by curve a in Figure 3A, and in order to suppress the mutual influence mentioned above, the slope of curve a Since it is difficult to increase the width of the steep part of the
Striped black light absorbing portion 6 with a small width, for example, 50 μm or less
In order to increase the width d of the residual photosensitive resin layer 2' in order to obtain the width d, the width d must be defined using the gentle slope part of the light intensity distribution curve a, and the side edge It becomes impossible to form the parts neatly. In addition, when the light source is moved and the exposure is performed in two parts, the overall light intensity distribution in each exposed area at the center of the glass panel becomes as shown in the curve shown in Figure 3B, for example. The width d of the residual photosensitive resin layer 2' to obtain the striped black light absorbing part 6' with a small width of . Otherwise, the side edges cannot be made neat. Striped black light absorption section 6
The side edges of ' are formed according to the side edges of the residual photosensitive resin layer section 2', so in any of the above cases,
It is not possible to obtain striped black light absorbing portions 6' with neat side edges.

In view of the above, the present invention has been developed by forming the residual photosensitive resin layer portion that regulates the width of the striped black light absorbing portion in two steps, thereby forming the striped black light absorbing portion with a small width. A residual photosensitive resin layer having the width necessary to form a small area can be obtained by demarcating its side edges using a steep part of the exposure light distribution curve, and as a result, a small The present invention proposes a method for forming a fluorescent surface of a cathode ray tube, which can obtain a fluorescent surface on which striped black light absorbing portions are formed, each having a width of 100 mm and neat side edges. Embodiments of the present invention will be described below with reference to FIG. 9 and subsequent drawings.

An example of the method for forming a fluorescent surface of a cathode ray tube according to the present invention is described in the ninth section.
The explanation will be given according to the process diagram shown in the figure. First of all,
A first photosensitive resin layer 12 is formed by coating the entire surface of a glass panel with a photosensitive resin such as polyvinyl alcohol, and a large number of pores are formed in this first photosensitive resin layer 12. A first exposure is performed by applying light through a mask having a slit for determining the electron beam arrival position. In this first exposure, as shown in FIG.
First, the light /&R that reaches the arrival position Pr of the electron beam for generating red light is irradiated, then the light 15G that reaches the arrival position Pg of the electron beam for generating green light is irradiated, and then the blue light This is done by irradiating the light 75B that reaches the arrival position Pb of the generation electron beam, but at this time, the light emission 15R
The 115G and /3B light sources are arranged in such a direction that the light emitted from them R1/SG and IsB reaches the left half of each position PrXPg and Pb in the figure, respectively. Next, the exposed photosensitive resin layer 12 is subjected to a development process to remove the portions that have not been exposed to a predetermined amount of light, and is then subjected to a hardening process and dried, as shown in FIG. A striped first residual photosensitive resin layer portion/2' is formed. This first residual photosensitive resin layer part/2' forms approximately half of each residual photosensitive resin layer part to be finally obtained, and its width is relatively small; The side edge, in this case the left side edge /2e, regulates one side edge of the striped black light absorbing portion to be formed later. Next, as shown in Fig. q. A second photosensitive resin layer 16 is formed, and the second photosensitive resin layer is exposed to light using the same mask for determining the electron beam arrival position as in the first exposure. I do. As shown in FIG. 6, this second exposure is performed in the same manner as the first exposure. p,,/! Q and lsB, but at this time light emission /SR, /,! The light sources tQ and /j13 are moved from their positions during the first exposure, and
11 Next, the exposed second photosensitive resin layer L is arranged in such a direction that the SR175G and the L-B reach the right half side in the figure of each of the above-mentioned positions Pr, Pg, and Pb. A developing process is performed to remove the portions that are not exposed to a predetermined amount of light, and a hardening process is performed and dried to form the first residual photosensitive resin layer part/2' as shown in the second diagram.
In addition, a second residual photosensitive resin layer portion /A' having a stripe shape is also formed. This second residual photosensitive resin layer portion t b / forms approximately the remaining half of each residual photosensitive resin layer portion to be finally obtained, and has a relatively small width. One side edge, in this case, the right side edge /l, e, will restrict the other side edge of the striped black light absorbing portion that will be formed later. A desired striped residual photosensitive resin layer portion is formed by these first and second residual photosensitive resin layer portions /2' and /&'.

Next, as shown in FIG. A black substance 17 consisting of a liquid is applied over the entire surface and dried. Then, this is treated with periodic acid (HIO41) or the like to form the first and second residual photosensitive resin layer portions 12' and /A.
After removing the black material 17 coated on it, as shown in FIG. ' to form. Thereafter, phosphor stripes for red light, green light, and blue light are sequentially arranged between each strip of black light absorbing section 7' on the glass panel // to complete the fluorescent surface. . .

In the above-mentioned process, the light amount distribution at each exposed portion during the first exposure and the second exposure becomes as shown by curves C/ and C2 in FIG. 7, respectively. The width d of each residual photosensitive resin layer portion/2' obtained by the first exposure and development of the first photosensitive resin layer 12 may be relatively small.

This first residual photosensitive resin layer portion/2' can have its side edge defined by a portion where the slope of the light intensity distribution curve CI is modest, and thus has a neat and sharp side edge. It is said that it was done. Further, each second residual photosensitive resin layer portion 11. obtained by the second exposure and development of the second photosensitive resin layer/6. Since the width d2 of / may be relatively small, the side edge of the second residual photosensitive resin layer portion 76' can be defined by a portion where the light intensity distribution curve C2 has a steep slope. Therefore, it is said to have a neat and sharp side edge. And, for example, ri0
Width d of the striped residual photosensitive resin layer portion necessary to form a striped black light absorbing portion with a small width of μm or less. But, the -th
and the second residual photosensitive resin layer part /2' and t6/, and as a result, the striped residual photosensitive resin layer part with the desired width do forms a neat side edge part /2'.
2e and /Ae. As a result, a striped black light absorbing portion 77' with a small width is formed between each striped residual photosensitive resin layer portion with a neat and sharp side edge regulated by side edges /2e and /be. It will be done. Experimental results show that it is possible to easily form a striped black light absorbing portion having a width of 03 m and neat line portions on both sides.

As explained above, according to the method according to the present invention.

Even when the pitch of the pore-like slits of the mask for determining the electron beam arrival position is small and a thin black light absorbing portion with a small width is required, stripes are used to regulate both side edges of the thin black light absorbing portion. The side edge of the residual photosensitive resin layer can be defined by the steep part of the exposure light distribution curve, making it possible to create a neat and sharp cut. It is possible to obtain a fluorescent surface in which striped black light absorbing portions with sharply cut side edges are formed. In addition, since the residual photosensitive resin layer is formed by approximately half each in two exposure and development steps, it is possible to reduce the amount of light I in each exposure step, and the widening part of the tail of the light amount distribution curve The level of this can be reduced, and the negative effects caused by the widening part of the hem can be reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing each step of a conventional method for forming a fluorescent surface of a cathode ray tube, and Figures 2 and 3 are used to explain the exposure process in the conventional method of forming a fluorescent surface of a cathode ray tube. Figure, 1st
The figure is a sectional view showing each step of an example of the method for forming a fluorescent surface of a cathode ray tube according to the present invention, and FIGS. FIG. 3 is a diagram used to explain an exposure process. In the figure, // is a glass panel, 12 and /6 are photosensitive resin layers, /:l' and /A' are residual photosensitive resin layer parts, 13 is a mask for determining the electron beam arrival position, /4' is a slit ,
/7 is a black material, and /7' is a striped black light absorbing portion.

Claims (1)

[Claims] A first photosensitive resin layer is formed on a glass panel, and then light is irradiated from a first predetermined direction through a mask for determining the electron beam arrival position having a large number of pore-like slits. exposing one photosensitive resin layer to light, and then developing the exposed first photosensitive resin layer to control one side edge of each striped black light absorbing portion to be formed on the glass panel. A first residual photosensitive resin layer is formed, and then a second photosensitive resin layer is formed on the glass panel on which the first residual photosensitive resin layer is formed, and then a second photosensitive resin layer is formed through the mask. The second photosensitive resin layer is exposed by irradiating light in a second predetermined direction, and then the exposed second photosensitive resin layer is developed to form each of the striped black light absorbing portions. A second residual photosensitive resin layer is formed to regulate the other side edge of the black light absorbing strip. and then removing said first and second residual photopolymer layer parts along with said black material also applied thereon to form a residual black material on said glass cinel. The cathode ray tube is constructed of a cathode ray tube in which each of the striped black light absorbing portions is formed using the black material, and then a predetermined phosphor portion is formed between each of the striped black light absorbing portions on the glass plate (flannel). How to form a light surface 1゜