JPH09199024A - Exposure equipment for fluorescent screen formation of color cathode ray tubes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exposure device, which can form a clearance of black color absorbing layers or a phosphor layer into the shape hard to generate a distortion over the whole of a fluorescent surface by providing two or more of light source parts. SOLUTION: A light source unit 30 is provided under a support base 19 for positioning a panel 1, which forms a case part of a color cathode-ray tube. An optical lens system 21 for approximating the light, which is emitted from the light source unit 30, to the path of an electron beam emitted from an electron gun of a color cathode-ray tube and a correcting filter 22 for correcting the distribution of quantity of light in the inner surface of the panel 1, which is positioned by the support base 19, are arranged over the light source unit 30. In the light source unit 30, two linear light sources 31a, 31b such as straight tubular extra-high pressure mercury lamps are arranged in the direction of the panel 1. These two light sources 31a, 31b are arranged so as to obtain patterns, which are displaced and overlapped with each other in the radiating direction of the panel 1. Quantity of light is thereby increased, and a fluorescent surface, which can shorten the time to be required for burning of pattern and which is hard to produce the deterioration of color purity, can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus for forming a fluorescent screen of a color cathode ray tube.

[0002]

2. Description of the Related Art Generally, a color cathode ray tube has an envelope composed of a panel 1 and a funnel 2 as shown in FIG. 3, and a fluorescent screen 3 is provided on the inner surface of the panel 1 and the fluorescent screen 3 is provided on the fluorescent screen 3. Opposed to each other, a shadow mask 4 having a large number of openings formed therein is arranged. On the other hand, in the neck 5 of the funnel 2, an electron gun 7 that emits the three electron beams 6 is arranged. Then, the three electron beams 6 emitted from the electron gun 7 are deflected by a deflecting device (not shown) mounted outside the funnel 2, and the shadow mask 4 is
The fluorescent screen 3 is horizontally and vertically scanned through the screen to form a structure for displaying a color image.

As the phosphor screen 3 of such a color cathode ray tube, as shown in FIGS. 4 and 5, light is emitted in blue, green and red so as to be embedded in the space between the black light absorption layers 9 in a matrix or stripe form. Dot or stripe 3
The black matrix type or black stripe type phosphor screen 3 in which the color phosphor layers 10B, 10G and 10R are provided in a predetermined arrangement, and as shown in FIG. 6 and FIG. There is a phosphor screen 3 provided with three-color phosphor layers 10B, 10G, and 10R in a predetermined arrangement.

Conventionally, these phosphor screens 3 are formed by a photo printing method.

That is, for the black matrix type or black stripe type phosphor screen 3, FIG.
As shown in FIG. 1, first, a photosensitive agent is applied to the inner surface of the panel 1 and dried to form a photosensitive film 12, and then the shadow mask 4 is attached to the panel 1 on which the photosensitive film 12 is formed. By exposing the photosensitive film 12 through the pattern, a pattern corresponding to the openings 13 of the shadow mask 4 is printed on the photosensitive film 12. Then, the photosensitive film 12 having this pattern printed thereon is developed to remove the unexposed portion, and a resist 14 having a dot-shaped or stripe-shaped pattern is formed as shown in FIG. Next, as shown in (c), a black paint for forming a light absorbing layer is applied to the inner surface of the panel 1 on which the resist 14 is formed and dried to form a black paint layer 15. Then this black paint layer 1
5 is removed together with the resist 14 to form a matrix- or stripe-shaped black light absorbing layer 9 on the inner surface of the panel 1 as shown in FIG.

Thereafter, a photosensitive phosphor slurry containing a phosphor and a photosensitizer as a main component is applied to the inner surface of the panel 1 on which the black light absorbing layer 9 is formed and dried, as shown in (e). Then, a photosensitive fluorescent substance slurry layer 17 is formed, and then a shadow mask 4 is attached to the panel 1 on which the photosensitive fluorescent substance slurry layer 17 is formed, and the photosensitive fluorescent substance slurry layer is inserted through the shadow mask 4. By exposing 17 to the photosensitive phosphor slurry layer 17, a pattern corresponding to the openings 13 of the shadow mask 4 is printed. Then, the baked photosensitive phosphor slurry layer 17 of this pattern is developed to remove the unexposed portion, and as shown in (f), a predetermined gap is formed in the matrix- or stripe-shaped black light absorbing layer 9. A dot-shaped or stripe-shaped phosphor layer of any one color, for example, a blue phosphor layer 10B is formed. Further, by repeating the process of forming the blue phosphor layer 10B for the green and red phosphors, as shown in (g), green and red phosphors are formed in predetermined gaps of the matrix- or stripe-shaped black light absorption layer 9. The body layers 10G and 10R are formed.

The phosphor screen having no black light absorbing layer is formed by repeating the phosphor layer forming step for the three-color phosphor layer.

In the above-described phosphor screen forming method, the opening 1 of the shadow mask 4 is formed in the photosensitive member layer such as the photosensitive film 12 and the photosensitive phosphor slurry layer 17 formed on the inner surface of the panel 1.
When printing a pattern corresponding to No. 3 (see FIGS. 8A and 8E), the exposure apparatus shown in FIG. 9 is used.

In this exposure apparatus, a light source section 20 is provided below a support table 19 for positioning and supporting the panel 1, and an orbit of light from the light source section 20 is emitted from the electron gun on the light source section 20. An optical lens system 21 such as a correction lens that approximates the orbit of No. 2 and a correction filter 22 that corrects the light amount distribution with respect to the inner surface of the panel 1 are arranged. In the light source unit 20, a single linear light source 23 composed of a straight-tube ultra-high pressure mercury lamp or the like is arranged. In FIG. 9, reference numeral 24 is a photosensitive member layer such as a photosensitive film and a photosensitive phosphor slurry layer formed on the inner surface of the panel 1.

[0010]

As described above, the fluorescent surface of the color cathode ray tube is formed by the photo printing method, and the photosensitive member layer such as the photosensitive film or the photosensitive phosphor slurry layer formed on the inner surface of the panel is formed. An exposure device is used to print a pattern corresponding to the openings of the shadow mask. In this exposure apparatus, a light source section is provided below a support base that positions and supports the panel.

However, since the above-described conventional exposure apparatus has only one light source in the light source section, for example, a black light absorption layer in a matrix or a phosphor layer in a dot is formed by using a shadow mask having circular openings. In this case, the gap (matrix hole) between the black light absorbing layers in the peripheral portion of the phosphor screen or the phosphor layer is distorted into an elliptical shape having the minor axis in the emission direction of the phosphor screen. The reason why the gap between the black light absorption layers and the phosphor layer in the peripheral portion of the phosphor screen are distorted in an elliptical shape is that light is emitted from one light source 23 in the peripheral portion of the panel 1 as shown in FIG. Light 25
Reaches the photosensitive member layer 24 on the inner surface of the panel 1 diagonally crossing the circular opening 13 of the shadow mask 4, and the pattern 2b printed on the photosensitive member layer 24 has an elliptical shape with the minor axis in the radial direction of the panel 1. This is because it is distorted.

When the gap between the black light absorption layers or the phosphor layer is distorted into an elliptical shape in the peripheral portion of the phosphor screen as described above, the landing of the electron beam on the phosphor layer is deviated, and the color purity and the white uniformity deteriorate. And the image quality is degraded.

The present invention has been made to solve the above problems, and provides an exposure apparatus capable of forming a gap between the black light absorbing layers or a phosphor layer in a shape with less distortion over the entire phosphor screen. The purpose is to configure.

[0014]

An exposure for forming a fluorescent screen of a color cathode ray tube having a light source section for emitting light for printing a pattern corresponding to an opening of a shadow mask on a photosensitive member layer formed on an inner surface of a panel. In the device, the light source unit,
It was composed of two or more light sources so as to obtain a pattern in which the photosensitive member layer was shifted and overlapped in the radiation direction of the panel.

Further, the two or more light sources are arranged so as to be shifted in the panel direction.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an exposure apparatus for forming a fluorescent screen, which is one form thereof. In this exposure apparatus, a light source section 30 is provided below a support table 19 for positioning the panel 1 which constitutes the envelope of the color cathode ray tube, and the light source section 3 is provided on the light source section 30.
0, an optical lens system 21 such as a correction lens that approximates the orbit of an electron beam emitted from an electron gun of a color cathode ray tube, and a light amount distribution with respect to the inner surface of the panel 1 positioned on the support table 19. A correction filter 22 that corrects

In particular, in this exposure apparatus, the light source section 30 includes a first straight tube-shaped ultra-high pressure mercury lamp and the like.
The second two linear light sources 31a and 31b are arranged in the panel direction (up and down).

In this exposure apparatus, a shadow is formed on a panel 1 on which a photosensitive member layer 24 such as a photosensitive film for forming a light absorbing layer or a phosphor slurry layer for forming a three-color phosphor layer is formed on the inner surface. The mask 4 is mounted and positioned on the support 19, and the light emitted from the light source 30 is directed to the photosensitive member layer 24 on the inner surface of the panel 1 which is positioned and supported by the support 19 and the optical lens system 21 and the correction filter 22. Also, it is used in the case of irradiating through the shadow mask 4 and printing a pattern corresponding to the openings of the shadow mask 4 on the photosensitive member layer 24 to form a light absorbing layer or a three-color phosphor layer.

In this case, when the two linear light sources 31a and 31b are vertically arranged in the light source unit 30 as described above, the light emission center of the light source unit 30 becomes two points, and for example, a shadow mask having a circular opening is used. When a matrix-shaped light absorption layer or a dot-shaped three-color phosphor layer is formed on the inner surface of the panel 1, as shown in FIG. Light 33 from the linear light source 31a
The light 33b from the second linear light source 31b can be applied to a while being shifted in the radiation direction of the panel 1. In this case, the light 33a, 33b from the respective light sources 31a, 31b
Respectively obliquely traverse the openings 13 of the shadow mask 4, and therefore, as shown in (b), the patterns 34a, 3b which are printed on the photosensitive member layer 24 by the light from the respective light sources.
4b has an elliptical shape having a minor axis in the radial direction of the panel, but since the patterns 34a and 34b are printed while being displaced in the minor axis direction, a pattern 35 close to a perfect circle is obtained, resulting in a matrix shape. The gap (matrix hole) of the light absorption layer and the dot-shaped three-color phosphor layer can be formed into a desired circular shape, and a phosphor screen that does not deteriorate in color purity or white uniformity can be formed.

Further, by arranging the two light sources in this way, the amount of light increases, and the time required for pattern printing can be shortened.

In the above embodiment, the case where two light sources are arranged in the light source section has been described.
More than one light source may be arranged.

In the above embodiment, the case where the matrix-shaped light absorption layer or the dot-shaped phosphor layer is formed has been described. However, the present invention has a stripe-shaped light absorption layer or a stripe-shaped phosphor. It is also applicable when forming a layer.

[0024]

In the exposure apparatus for forming the fluorescent screen of the color cathode ray tube, which is provided with the light source section for emitting the light for printing the pattern corresponding to the opening of the shadow mask on the photosensitive member layer formed on the inner surface of the panel, If the light source part is composed of two or more light sources so that overlapping patterns are obtained by shifting in the radiation direction of the panel, the gap of the light absorption layer or the phosphor layer is formed into a desired shape with less distortion over the entire phosphor screen. Therefore, it is possible to form a phosphor screen that does not cause deterioration in color purity or white uniformity due to landing shift of the electron beam with respect to the phosphor layer. In addition, the increase in the amount of light can shorten the time required for pattern printing.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a fluorescent screen forming exposure apparatus that is an embodiment of the present invention.

FIG. 2A and FIG. 2B are views for explaining the operation of the exposure apparatus.

FIG. 3 is a diagram showing a configuration of a color cathode ray tube.

FIG. 4 (a) is a plan view showing the structure of a phosphor screen composed of a matrix-shaped black light absorption layer and dot-shaped three-color phosphor layers, and FIG. 4 (b) is a sectional view thereof.

FIG. 5 (a) is a plan view showing the structure of a phosphor screen composed of a stripe-shaped black light absorption layer and a stripe-shaped three-color phosphor layer, and FIG. 5 (b) is a sectional view thereof.

FIG. 6 (a) is a plan view showing the structure of a phosphor screen composed of a dot-shaped three-color phosphor layer, and FIG. 6 (b) is a sectional view thereof.

FIG. 7 (a) is a plan view showing the structure of a phosphor screen composed of a stripe-shaped three-color phosphor layer, and FIG. 7 (b) is a sectional view thereof.

8A to 8G are views for explaining a method of forming a phosphor screen including the matrix- or stripe-shaped black light absorption layer and the dot- or stripe-shaped three-color phosphor layer, respectively. Is.

FIG. 9 is a diagram showing a configuration of a conventional exposure apparatus for forming a fluorescent screen.

FIG. 10A and FIG. 10B are views for explaining the operation of the conventional exposure apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 4 ... Shadow mask 13 ... Opening 24 ... Photosensitive member layer 30 ... Light source part 31a, 31b ... Light source

Claims (2)

[Claims] 1. An exposure device for forming a fluorescent screen of a color cathode ray tube, comprising: a light source unit that emits light for printing a pattern corresponding to an opening of a shadow mask on a photosensitive member layer formed on an inner surface of a panel. An exposure apparatus for forming a fluorescent screen of a color cathode ray tube, wherein the light source section is composed of two or more light sources so that a pattern overlapping the photosensitive member layer in the radiation direction of the panel can be obtained. 2. The exposure apparatus for forming a fluorescent screen of a color cathode ray tube according to claim 1, wherein two or more light sources are arranged so as to be displaced in the panel direction.