JPH0969338A - Method of making fluorescent face of color image pickup device, and its exposure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To land a three-electron beam arranged in one row correctly on a three-color phosphor layer, by tilting the a light source and a lamp house so that the side of the axis of a panel may come to the panel more than the opposite side, and baking a pattern corresponding to the opening of the shadow mask on a photosensitive fluorescent face forming film. SOLUTION: An inline type of three-color phosphor layer is made by arranging a light source 13 and a lamp house 17 in the positions of a center beam and a pair of side beams for the photosensitive fluorescent face forming film 18 at the inner face of a panel 7, and baking the film 18 on the opening pattern of a shadow mask 6. The light source 13 and the house 17 are arranged, being shifted by S1 horizontally from the center axis zp of the panel 7 so that it may correspond to the side beam. Each correction lens 14 and 15 and a filter 30 are shifted by S2. The light source 13 and the house 17 are rotated and are inclined so that the side of the axis zp may come close to the panel 7 and that the opposite side may go away. The three-color phosphor layer being made this way improves the landing property of an electron beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a fluorescent screen of a color picture tube and an exposure apparatus therefor, and more particularly to a color picture receiving apparatus for improving the landing characteristics of an electron beam on a three-color phosphor layer of an in-line type picture tube. The present invention relates to a fluorescent screen forming method for a tube and an exposure apparatus for the same.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, an in-line type color picture tube has, in a neck 2 of an envelope 1, a row of a center beam 3G and a pair of side beams 3B and 3R which pass on the same horizontal plane. 3 electron beams 3B and 3G
, 3R emitting electron gun 4 is provided.
The three electron beams 3B, 3G and 3R emitted from the device are deflected by the magnetic field generated by the deflecting device 5 mounted outside the envelope 1, and the fluorescent light formed on the inner surface of the panel 7 is opposed to the shadow mask 6. By scanning the surface 8 horizontally and vertically, a structure for displaying a color image is formed. At present, in such an in-line type color picture tube, the magnetic field generated by the electron gun 4 and the deflecting device 5 is appropriately set so that the three electron beams 3B, 3G and 3R are concentrated at one point over the entire screen. Convergence is realized.

Phosphor screen 8 of the in-line type color picture tube
In a typical TV picture tube, a vertically elongated striped light absorption layer and a vertically elongated striped three-color phosphor layer provided so as to be embedded in a gap between the light absorption layers. In particular, in a high-definition inline type color picture tube used for a terminal for information processing, as shown in FIG. 8, a matrix-shaped light absorption layer 10 having a circular matrix hole and a matrix-shaped light absorption layer 10 are embedded. Circular dot-shaped three-color phosphor layers 11B, 11 provided on the
It is a black matrix type phosphor screen consisting of G and 11R.

This phosphor screen is formed by a photographic printing method, first a matrix light absorbing layer 10 is formed, and then the phosphor layer 1 is formed in the matrix hole of this light absorbing layer 10.
It is formed by the method of forming 1B, 11G and 11R. The light absorbing layer 10 is formed by forming a film of a photosensitizer on the inner surface of the panel, baking a pattern corresponding to the openings of the shadow mask on the film of the photosensitizer, and developing the pattern to correspond to the openings of the shadow mask. After forming the resist consisting of the pattern, the light absorbing layer forming paint is applied to the inner surface of the panel on which the resist is formed, and the film of the light absorbing layer forming paint formed on the resist is peeled off. It is formed by In this case, the portion where the resist is peeled off is a matrix hole. Further, the phosphor layers 11B, 11G, and 11R are formed by using the light absorption layer 10 described above.
On the inner surface of the formed panel, a film of a phosphor slurry containing a photosensitizer and a phosphor as a main component is formed, and a pattern corresponding to the opening of the shadow mask is baked on the film of the phosphor slurry and developed. , A dot-shaped phosphor layer of any one color is formed in a predetermined matrix hole. Then, the phosphor layer forming method is repeated for three-color phosphors.

Conventionally, an exposure apparatus has been used for pattern printing on a photosensitive fluorescent screen forming coating such as the above-mentioned photosensitive coating or fluorescent slurry coating. This exposure apparatus includes an in-line type color picture tube under a support table for positioning and supporting a panel having the above-mentioned photosensitive phosphor screen forming film formed on its inner surface and facing the photosensitive phosphor screen forming film and having a shadow mask mounted thereon. A light source is arranged so as to be movable together with a lamp house that houses the light source at a position corresponding to a row of three electron beams emitted from the electron gun. The lamp house is provided with slit-shaped openings that transmit the light emitted from the light source. Further, a pair of side beam-corresponding ΔS correction lenses for approximating the emitted light from the light source to the trajectory of the electron beam in the direction of the panel positioned and supported by the support from the light source, and γ-ΔP for correcting with the movement of the deflection center. A correction lens, a correction filter for correcting the light amount distribution on the inner surface of the panel, and the like are arranged. The ΔS correction lens, the γ-ΔP correction lens and the correction filter move together with the light source.

When the matrix-shaped light absorbing layer is formed by this exposure apparatus, the light source is provided for each lamp house, the center beam emitted from the electron gun, and the pair of side beams to the panel positioned and supported by the support table. Sequentially moving to positions corresponding to the three electron beams arranged in a line, and at each moving position, a pattern corresponding to the opening of the shadow mask is continuously printed on the photosensitive agent coating formed on the inner surface of the panel. (3 times). When forming the three-color phosphor layer, the light source is moved to the position corresponding to any one of the three electron beams arranged in a row for each lamp house, and the phosphor slurry applied and formed on the inner surface of the panel. This is done by baking a pattern on the coating that corresponds to the openings in the shadow mask.

In this exposure apparatus, when the light source is arranged at a position corresponding to the center beam to perform exposure,
As shown in (a), the light source 13 and the ΔS correction lens 14,
The γ-ΔP correction lens 15 and the correction filter (not shown) are arranged on the central axis zp of the panel 7 which is positioned and supported by the support 16, but the light source 13 is arranged at a position corresponding to the pair of side beams. When performing exposure, as shown in (b) and (c), the correction lenses 14 and 15 and the correction filter (not shown) with respect to the horizontal movement distance S1 of the light source 13 and the lamp house 17. Is performed by moving S2 in the horizontal direction. The moving distance S1 of the light source 13 and the moving distances S2 of the correction lenses 14 and 15 and the correction filter differ depending on the distance Sg between the three constituent electron guns of the electron gun, but are generally S1> S2. In FIG. 9, reference numeral 18 denotes a photosensitive phosphor screen forming film such as a photosensitizer film and a phosphor slurry film formed on the inner surface of the panel 7.

[0008]

As described above, the fluorescent screen of the high-definition in-line color picture tube used in the terminal for information processing has a circular shape so as to be embedded in the circular matrix hole of the matrix light absorbing layer. It is formed in a black matrix type in which a dot-shaped three-color phosphor layer is provided. In such a color picture tube, in order to improve the image characteristics such as white uniformity and brightness uniformity on the entire screen, each matrix hole of the matrix light absorption layer provided with the three-color phosphor layer is provided. For the provided three-color phosphor layer,
It is necessary to ensure that the three electron beams land correctly. For that purpose, the light emitted from the light source through the slit-shaped opening of the lamp house is accurately approximated to the trajectory of the electron beam emitted from the electron gun,
It is necessary to design and manufacture the γ-ΔP correction lens and the ΔS correction lens of the exposure device used for forming the fluorescent screen.

However, the γ-ΔP correction lens is an aspherical lens having a complicated curved surface, and three types of correction lenses are required to satisfy the landing characteristics of the center beam and the pair of side beams. Is. However, designing and manufacturing such three types of correction lenses has problems in terms of cost and accuracy of design and manufacture, and in general, a correction lens designed to satisfy the landing characteristics of the center beam is It is also used when exposing by arranging a light source at a position corresponding to a pair of side beams. Therefore, although the landing characteristics of the center beam can be sufficiently corrected, the landing characteristics of the pair of side beams cannot be sufficiently corrected. The landing characteristics of the pair of side beams can be corrected to some extent by appropriately selecting the angle of the inclined surface of the ΔS correction lens. But this Δ
Even if it is corrected by the S correction lens, as shown in FIG.
The matrix holes of the light absorption layer corresponding to the center beam and the phosphor layer 11G can be formed substantially concentrically with respect to the spots 19B, 19G, and 19R of the three electron beams.
The matrix holes and the phosphor layers 11B and 11R corresponding to the pair of side beams are spots 19 of three electron beams.
The axes B, 19G, and 19R are displaced in the directions perpendicular to each other and opposite to each other.

This is because the vertical deflection magnetic field of the deflection device for deflecting the electron beam is a barrel type and the horizontal deflection magnetic field is a pincushion type, and the force exerted by the three electron beams of this deflection magnetic field is
The main cause is that the center beam and the pair of side beams are different.

The present invention has been made to solve the above-mentioned problems, and a method for forming a phosphor screen in which three electron beams arranged in a row in an in-line type color picture tube land correctly on a phosphor layer of three colors and a method of forming the same. The purpose is to obtain an exposure apparatus.

[0012]

A light source is arranged at a position corresponding to one row of three electron beams consisting of a center beam and a pair of side beams emitted from an electron gun of an in-line type color picture tube. , A pattern corresponding to the opening of the shadow mask is formed on the photosensitive phosphor screen forming film formed on the inner surface of the panel by the light emitted from this light source through the slit-shaped opening provided in the lamp house housing this light source. In the method of forming a phosphor screen of a color picture tube to be baked, when the pattern is printed by arranging the light source at the position corresponding to the side beam emission position, the panel center axis side of the light source and the lamp house is from the opposite side. Also, incline it so that it approaches the panel, and print the pattern corresponding to the aperture of the shadow mask on the photosensitive phosphor screen forming film. It was.

Further, the in-line type color picture tube is arranged on the inner surface of the panel at a position corresponding to the three electron beams emitted from the electron gun in the same plane and passing through the same plane and consisting of a pair of side beams. A color picture tube having a light source for emitting light for printing a pattern corresponding to the opening of the shadow mask on the photosensitive fluorescent surface forming coating, and the light source is housed in a lamp house provided with slit-shaped openings. In the exposure apparatus for forming a fluorescent screen, the light source and the lamp house are formed to be tiltable in the arrangement direction of the light source corresponding to the three electron beams arranged in a line.

Here, the position corresponding to the three electron beams arranged in a line consisting of a center beam and a pair of side beams passing on the same plane, which is described as the position of the light source, is
It indicates the passage position of the center beam and the pair of side beams at a position near the end of the electron gun of the in-line type color cathode ray tube on the side of the fluorescent screen.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the main steps of a black matrix type phosphor screen forming method in which a circular dot-shaped three-color phosphor layer is provided in a circular matrix hole of a matrix light absorption layer.

As shown in FIG. 1A, the black matrix type phosphor screen is first formed on the inner surface of the panel 7.
A photosensitizer containing polyvinyl alcohol (PVA) and ammonium dichromate (ADC) as main components is applied and dried to form a film 20 of the photosensitizer. Then, a shadow mask 6 is formed on the inside of the panel 7 on which the photosensitive film 20 is formed.
And a pattern corresponding to the circular opening 21 of the shadow mask 6 is printed on the photosensitive film 20 by the exposure device described later. This pattern printing is performed three times by sequentially arranging the light source of the exposure apparatus at a position corresponding to the three electron beams arranged in a line consisting of the center beam and a pair of side beams emitted from the electron gun of the in-line type color picture tube. It is done by doing. Next, the photosensitizer film 20 having the above pattern baked is developed to remove the unexposed portion, and a resist 22 having a pattern corresponding to the opening of the shadow mask is formed as shown in FIG. Next, the light absorbing layer forming paint is applied to the inner surface of the panel 7 on which the resist 22 is formed and dried to form a light absorbing paint layer 23 as shown in FIG. Next, with the release agent, the resist 22 and the light absorbing paint layer 23 applied thereon are peeled off.
As shown in, the matrix-shaped light absorption layer 10 having the circular matrix holes 24 is formed.

Thereafter, a phosphor slurry containing PVA, ADC and, for example, a blue phosphor as a main component is applied to the inner surface of the panel 7 on which the light absorption layer 10 is formed, dried and then shown in (e). Thus, the coating 26 of the phosphor slurry is formed. Then, the shadow mask 6 is attached to the inside of the panel 7 on which the phosphor slurry coating 26 is formed, and a pattern corresponding to the openings 21 of the shadow mask 6 is printed on the phosphor slurry coating 26 by an exposure device described later. This pattern printing is performed by arranging the light source of the exposure apparatus at a position corresponding to one side beam of the three electron beams arranged in a row and emitted from the electron gun of the in-line type color picture tube. Next, the baked phosphor slurry coating 26 having the above pattern is developed to remove an unexposed portion,
As shown in (f), a circular dot-shaped blue phosphor layer 11B is formed in a predetermined matrix hole of the light absorption layer 10. Further, the steps of forming the blue phosphor layer 11B are sequentially repeated for the green phosphor and the red phosphor, and as shown in (g), circular dot-shaped green phosphor layer 11G and red phosphor layer are formed in predetermined matrix holes, respectively. 11R is formed.

The matrix light absorbing layers 10 and 3
The exposure apparatus shown in FIG. 2 is used to form the color phosphor layers 11B, 11G, and 11R. This exposure apparatus has a panel 7
Has a support base 16 for positioning and supporting
The light source 13 is moved together with the lamp house 17 housing this light source 13 to a position corresponding to the three electron beams arranged in a line consisting of the center beam and a pair of side beams emitted from the electron gun of the in-line type color picture tube at the bottom of the And it is arranged so that it can be tilted. The lamp house 17 is provided with a slit-shaped opening 28 that transmits the light emitted from the light source 13 toward the panel 7 positioned and supported by the support table 16. Further, a pair of side beams that makes the light 29 emitted from the light source 13 through the slit-shaped opening 28 of the lamp house 17 in the direction of the panel 7 positioned and supported by the support 16 approximate the trajectory of the electron beam. A corresponding ΔS correction lens 14, a γ-ΔP correction lens 15 that performs correction accompanying the movement of the deflection center, and a correction filter 3 that corrects the light amount distribution on the inner surface of the panel 7.
0 and the like are arranged. The correction lenses 14 and 15 and the correction filter 30 are arranged horizontally and move together with the light source 13 in the same direction. Note that FIG.
Reference numeral 18 denotes a photosensitive phosphor screen forming film such as a photosensitizer film and a phosphor slurry film formed on the inner surface of the panel 7.

FIG. 3 shows the arrangement of the light source and the lamp house of the above exposure apparatus when forming the light absorption layer and the three-color phosphor layer. When arranging the light source 13 and the lamp house 17 at positions corresponding to the center beam for exposure,
As shown in FIG. 3 (a), the light source 13 and the lamp house 17 are horizontally arranged on the central axis zp of the panel 7 which is positioned and supported by the support base 16. With respect to the light source 13 and the lamp house 17, ΔS correction lens 14, γ-ΔP
The correction lens 15 and the correction filter 30 are located coaxially with the light source 13 on the central axis zp of the panel 7. On the other hand, when the light source 13 and the lamp house 17 are arranged at positions corresponding to the pair of side beams for exposure, the light source 13 and the lamp house 17 are supported as shown in (b) and (c). The panel 7 positioned and supported by the table 16 is arranged at a position moved by S1 in the horizontal direction with respect to the central axis zp of the panel 7, and the .DELTA.S correction lens 14, .gamma. , S2 are moved in the same direction as the light source 13 with respect to the central axis zp of the panel 7. The moving distance is S1> S2. Moreover, in this case, the light source 13 and the lamp house 17 are rotated about the central axis of the panel 7 by rotating the axis of light passing through the center of the light source 13 orthogonal to the arrangement direction of the light source 13 corresponding to the center beam and the pair of side beams. z
The p side approaches the panel 7 positioned and supported by the support 16 and the opposite side tilts away. This light source 13
The inclination angle of the lamp house 17 differs depending on the tube type.

By the way, when the phosphor layer is formed in the matrix-shaped light absorbing layer and the matrix hole of the light absorbing layer as described above, the light source 13 and the light source 13 arranged at positions corresponding to the pair of side beams. When the lamp house 17 in which the slit-shaped opening 28 that transmits the radiant light from is transmitted is tilted, the light emission center of the light source 13 that exposes the peripheral portion on the arrangement side of the light source 13 with respect to the central axis zp of the panel 7 is opposite. The light emission center of the light source 13 that exposes the side becomes largely different. That is, as shown in FIG. 3A, when the light source 13 and the lamp house 17 are horizontally arranged on the central axis zp of the panel 7 corresponding to the center beam for exposure, the light emission center of the light source 13 becomes a slit. The center of the light source 13 located on the central axis of the circular aperture is the emission center, but when the light source 13 and the lamp house 17 are arranged and tilted at the positions corresponding to the pair of side beams, as shown in FIG. The light emitting center 32a of the light source 13 that exposes the peripheral portion on the side where the light source 13 is arranged with respect to the central axis of the panel
The light emitting center 32b of the light source 13 that rises to the panel side from the center 33 of 3 and exposes the peripheral portion on the opposite side descends to the opposite side of the panel.

As a result, as shown in FIG. 5, the light 29a reaching the peripheral portion of the inner surface of the panel 7 from the light emission center 32a that has risen to the panel 7 side, through the opening 21 of the shadow mask 6.
Is more outward in the vertical direction (y-axis direction) than in the case where the light source and the lamp house are horizontally arranged as in the conventional case and the center of the light source is the emission center. On the contrary, the light 29b reaching the peripheral portion of the inner surface of the panel 7 from the emission center 32b descending to the opposite side of the panel 7 through the opening 21 of the shadow mask 6 is more vertical than when the center 33 of the light source 13 is the emission center. It becomes the direction inside. Therefore, when the light source 13 and the lamp house 17 are arranged at the positions corresponding to the pair of side beams as described above, if the light source 13 and the lamp house 17 are tilted, a pair of side beams generated by the conventional phosphor screen forming method will be generated. By correcting the vertical shifts of the matrix holes and the phosphor layer corresponding to the pair of side beams with respect to the spots, as shown in FIG. 6, the spots 19B and 19R of the pair of side beams are paired with the side beams corresponding to the pair of side beams. 11B and 11R of matrix hole and phosphor layer
Can be concentrically formed at appropriate positions. The matrix hole corresponding to the center beam and the phosphor layer 11G are formed concentrically as in the conventional case.

For example, the light source 13 and the lamp house 17
Even if the beam is tilted a few degrees, the vertical landing displacement of a pair of side beams (several .mu.m to 20 .mu.m) that occurred in the past
Can be sufficiently corrected. As a result, the landing characteristics of the electron beam on the three-color phosphor layers 11B, 11G, and 11R are improved over the entire screen, and a color picture tube that displays a good image can be obtained.

When the light source 13 and the lamp house 17 are tilted when the light source 13 is arranged at a position corresponding to the pair of side beams as described above and the lamp house 17 is tilted, the beam spots 19B and 19R of the pair of side beams are tilted. The pair of side-beam-compatible matrix holes and the phosphor layers 11B and 11R are also displaced in the horizontal direction, and the displacement in the horizontal direction adjusts the angle of the inclined surface of the ΔS correction lens 14 and the movement amount S2 as appropriate. By doing so, it can be sufficiently corrected.

[0025]

When the fluorescent screen of the in-line type color picture tube is formed, the light source is arranged at the position corresponding to the side beam emission position, and the opening of the shadow mask is formed in the photosensitive fluorescent screen forming film formed on the inner surface of the panel. When burning the pattern corresponding to, when the light source and the lamp house are tilted so that the central axis side of the panel approaches the panel and the opposite side moves away from the panel, the matrix holes of the matrix-shaped light absorption layer and The dot-shaped phosphor layer can be formed concentrically at an appropriate position. As a result, the landing characteristics of the electron beam on the three-color phosphor layer are improved over the entire screen, and a color picture tube that displays a good image can be obtained.

[Brief description of drawings]

1A to 1G are diagrams showing main steps of a phosphor screen forming method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an exposure apparatus used for forming the fluorescent screen.

3 (a) to 3 (c) are diagrams showing arrangement states of a light source and a lamp house of the exposure apparatus, respectively.

FIG. 4 is a diagram for explaining movement of a light emission center due to inclination of the light source.

FIG. 5 is a diagram for explaining a positional change of light reaching the peripheral portion of the inner surface of the panel due to the inclination of the light source.

FIG. 6 is a diagram for explaining landing characteristics of a phosphor screen formed by the above method.

FIG. 7 is a diagram showing a configuration of an in-line type color picture tube.

FIG. 8 (a) is a plan view showing the structure of the fluorescent screen of the color picture tube, and FIG. 8 (b) is a sectional view thereof.

9 (a) to 9 (c) are views showing arrangement states of a light source and a lamp house of a conventional exposure apparatus, respectively.

FIG. 10 is a diagram for explaining landing characteristics of a fluorescent screen formed in the conventional exposure apparatus.

[Explanation of symbols]

 6 ... Shadow mask 7 ... Panel 10 ... Light absorption layer 11B, 11G. 1 R ... Three-color phosphor layer 13 ... Light source 14 ... .DELTA.S correction lens 15 ... .gamma .-. DELTA.P correction lens 16 ... Support stand 17 ... Lamp house 18 ... Photosensitive phosphor screen forming film 20 ... Photosensitive agent film 24 ... Matrix hole 26 ... Coating of phosphor slurry 28 ... Slit-shaped openings 30 ... Correction filter

Claims (2)

[Claims] 1. A light source is arranged at a position corresponding to a row of three electron beams consisting of a center beam and a pair of side beams which are emitted from an electron gun of an in-line type color picture tube and are arranged from the light source. A color image in which a pattern corresponding to the opening of the shadow mask is printed on the photosensitive phosphor screen forming film formed on the inner surface of the panel by the light emitted through the slit-like opening provided in the lamp house containing this light source. In the method for forming a fluorescent screen of a tube, when the light source is arranged at a position corresponding to a side beam emission position and the pattern is baked, the light source and the lamp house are arranged on the panel center axis side of the light source and the lamp house more than the opposite side. The pattern corresponding to the aperture of the shadow mask is printed on the photosensitive phosphor screen forming film by inclining it so that it approaches the panel. A phosphor screen forming method of the color picture tube according to Rukoto features. 2. An in-line type color picture tube is provided at a position corresponding to a row of three electron beams consisting of a center beam and a pair of side beams emitted from an electron gun of the in-line color picture tube, and is formed on the inner surface of the panel. A color picture tube having a light source for emitting light for printing a pattern corresponding to the opening of the shadow mask on the photosensitive fluorescent surface forming coating, and the light source is housed in a lamp house provided with slit-shaped openings. In the exposure apparatus for forming a fluorescent screen, the light source and the lamp house are formed to be tiltable in the arrangement direction of the light sources corresponding to the three electron beams arranged in a row. apparatus.