JP2624153B2 - Exposure equipment for color picture tubes - Google Patents

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 a color picture tube.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view of an example of a conventional color picture tube. Generally, a color picture tube is, as shown in FIG.
Three electron beams 6A, 6B, 6 emitted from the electron gun
The C scans the screen with the deflection magnetic field of the deflection yoke 7 and passes through the shadow mask opening 8 over the entire surface of the scan screen and collides with the corresponding red, green, and blue phosphor dots, thereby achieving desired light emission. Is performed to form a color image. In this case, if the three electron beams 6A, 6B, and 6C that have passed through the shadow mask opening 8 accurately strike the corresponding three color phosphor dots, light emission of a desired color is performed. Is not accurately located at the respective arrival positions of the electron beams 6A, 6B, 6C,
The adjacent phosphor dots also emit light, and the color purity is reduced.

Therefore, in general, in the exposure step of forming the phosphor dots, as shown in FIG. 6, the exposure is performed such that the final trajectory of the electron beam reaching the phosphor dots coincides with the exposure light source for arranging the phosphor dots. The system is provided with an optical correction plate 3 for each color of red, green, and blue to perform exposure.

In this exposure method, since the optical correction plate 3 formed of a continuous curved surface is used, the displacement between the phosphor dots and the electron beam (hereinafter, referred to as mislanding).
When the arrangement of the phosphor dots of three colors red, green and blue and the arrangement of the electron beams are coincident, it is usually difficult to simultaneously adjust the horizontal mislanding and the vertical mislanding over the entire screen. In Japanese Patent Publication No. 60-41819 (known example 1), the axis of an ultra-high pressure mercury lamp is placed in the inline beam arrangement direction, and exposure is performed by using a straight central slit opening and a curved outer slit opening orthogonally arranged on the axis. Technology, Japanese Patent Laid-Open No. 1-264136
Japanese Patent Application Laid-Open Publication No. H11-133873 discloses a technique in which a slit including a light transmitting portion and a light shielding portion is provided in which the direction perpendicular to the long axis of the light source is a long axis, and the light transmitting portion is curved toward the light source or the panel. ing.

[0005]

In the conventional exposure method of the prior art 1, the same adjustment is performed for the green light emitting phosphor dots corresponding to the center dot and the red and blue light emitting phosphor dots corresponding to both side dots. Since an optical filter and the same optical correction plate are used, it is difficult to make the phosphor dot diameters of the three colors uniform at any point on the phosphor screen. However, there is a problem that the correction of the arrangement in the vertical direction cannot be performed.

[0006] On the other hand, in the exposure method of the known example 2, mislanding is corrected by both the optical correction plate and the light shielding plate having a slit opening for the light source (generally called ΔS correction). However, since the correction of the side dot arrangement is performed only with the optical correction plate as in the past, there is a limit to this correction, and it is difficult to arrange the phosphor dots with the highest density over the entire screen. is there.

It is an object of the present invention to provide a fluorescent dot trio of three colors in which the horizontal and vertical directions are sufficiently corrected, the fluorescent dots can be arranged densely over the entire screen, and a clear and high quality image can be obtained. An object of the present invention is to provide a picture tube exposure apparatus capable of forming a surface.

[0008]

According to the present invention, there is provided an exposure apparatus for a color picture tube according to the present invention, wherein a light from a light source is slit, an optical correction plate, and light control are applied to a coating of a photosensitive resin or a phosphor slurry formed on an inner surface of a panel. After passing through a filter and irradiating through a shadow mask, after printing a dot pattern corresponding to the light transmission of the shadow mask, in a color picture tube exposure apparatus for developing to form a non-light emitting layer or phosphor layer, The light source is fixed at a predetermined position, the slit has an opening, and the opening is movably provided with a slit driving mechanism for matching the opening with a predetermined position relative to the light source. only becomes, the blue by the slit drive mechanism, and wherein the red, to form the dot pattern by changing the position of the slit aperture at a predetermined sequence for each of the three colors of the exposure process green That.

(1) The drive mechanism connects the slit to the
The slit is opened by rotating the rotary shaft parallel to the axis of the light source.
The position of the section is changed.

(2) The openings of the slits are respectively formed corresponding to the exposure of three colors, and the driving mechanism is provided with the slot.
The slit is moved to change the position of the slit opening, so that the opening corresponding to the color to be exposed matches the light source.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of an exposure apparatus according to a first embodiment of the present invention, and FIGS. 2A to 2C show a light source unit for explaining an exposure method using the exposure apparatus shown in FIG. It is sectional drawing. As shown in FIG. 1, the exposure apparatus according to the first embodiment of the present invention includes a light source unit including a mercury lamp 2 serving as a light source , a slit 1 and a roller 12 serving as a slit driving mechanism, and a light source unit and an exposure panel 5. And an optical correction plate 3 and a light-transmitting filter 4 arranged in the middle of the above. Mercury lamp 2 as a light source
The light emitted from the exposure panel 5 passes through the optical correction plate 3 and the light control filter 4 from the slit opening of the slit 1.
To reach. When exposing the corresponding portions of the phosphor dots corresponding to the three colors to the exposure panel 5, the slit 1 is rotated by the rollers 12 so as to have a predetermined angle. First, as shown in FIG. 2A, the slit 1 is horizontally arranged at an interval of h from the mercury lamp 2, and the green corresponding portion as the center dot is exposed. Next, FIG.
As shown in (b), the slit 1 is rotated by θ so that the red corresponding portion is higher around the green corresponding portion, and the red corresponding portion is exposed. Next, as shown in FIG.
Is rotated in the opposite direction by θ to expose the blue dot corresponding portion.

FIGS. 3A to 3C are plan views showing the arrangement of phosphor dots on the phosphor screen for explaining the effect of correction according to the embodiment of the present invention. In this way, by rotating the slit 1 in the opposite direction around the green at the time of exposure to the phosphor dot corresponding portion by rotating the red and blue by θ in opposite directions, the conventional red (R) and green (G) shown in FIG. , Blue (B) phosphor dot trio at four corners can be corrected by .DELTA.y in the vertical direction for both R and B side dots as shown in FIG. 3B. When a picture tube with a size of 15 inches was prepared with h = 4 mm and θ = 20 °, a change of Δy = 11 μm was recognized.

On the other hand, as shown in FIG. 3C, the horizontal correction .DELTA.Z of both R and B side dots is performed by the optical correction plate 3. FIG.

As described above, conventionally, the correction in both the horizontal direction and the vertical direction is performed only by the optical correction plate 3, but in the present embodiment, the correction in the horizontal direction and the correction in the vertical direction are performed by independent methods. Since it can be designed, the degree of freedom is increased, and the phosphor dots can be arranged more densely over the entire screen.

FIG. 4 is a perspective view showing a schematic configuration of an exposure apparatus according to a second embodiment of the present invention, and FIG. 5 is a plan view of the slit shown in FIG. A second embodiment of the present invention, as shown in FIG.
Only the configuration of the light source section is different from that of the first embodiment shown in FIG. 1, and the other configuration is the same. As shown in FIG. 5, the slit 11 of the light source unit is provided with a green exposure aperture 11a, a red exposure aperture 11b, and a blue exposure aperture 11c corresponding to red, green, and blue, respectively. Here, the green exposure aperture 11a is a rectangular aperture formed on the center line of the slit 11, and the red exposure aperture 11b and the blue exposure aperture 11c have their center points on the center line of the slit 11. The openings on both sides are in the shape of a square with an inclination of ψ with respect to the center line, and the red exposure aperture 11b and the blue exposure aperture 11c are green exposure apertures 11a.
Are formed so as to be line-symmetric with respect to the center line with respect to.

As described above, the green exposure aperture 11a, the red exposure aperture 11b, and the blue exposure aperture 11c corresponding to each color.
3C, both the R and B side dots can be corrected by ΔZ in the horizontal direction, as shown in FIG. 3C. When a picture tube with a size of 15 inches was prepared with 作成 = 10 °, a change of ΔZ = 10 μm was recognized.

On the other hand, in the second embodiment, as shown in FIG. 3B, the vertical correction Δy on both sides of R and B is
This is performed by the optical correction plate 3.

As described above, in the second embodiment as well, the correction in the horizontal direction and the correction in the vertical direction can be designed by independent methods as in the first embodiment, so that the same effect as in the first embodiment can be obtained. Can be

Although the first and second embodiments of the exposure apparatus according to the present invention have been described above, the phosphor screen of the panel formed by using this exposure apparatus can be arranged with more densely arranged phosphor dots over the entire screen. Therefore, a color picture tube using this panel has an effect that a clear high-quality image can be obtained.

[0021]

As described above, according to the present invention, the relative position of the aperture of the light source unit with respect to the light source is changed for each color exposure process or the shape of the slit aperture is changed for each color exposure process. The correction of the position of both red and blue side dots is divided into vertical and horizontal directions by using a picture tube exposure device that can adopt either of these methods. Since the position and shape or the shape of the slit opening can be changed independently by the optical correction plate, a design with a high degree of freedom is possible, and a phosphor screen with more densely arranged phosphor dots over the entire screen can be used. There is an effect that it can be formed.

Accordingly, there is an effect that a color picture tube of a clear and high quality image can be obtained by the fluorescent screen of the exposure panel formed by the exposure apparatus.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an exposure apparatus according to a first embodiment of the present invention.

FIGS. 2A to 2C are cross-sectional views of a light source unit for explaining an exposure method using the exposure apparatus of FIG.

FIGS. 3A to 3C are plan views showing the arrangement of phosphor dots on a phosphor screen for explaining the effect of correction according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a schematic configuration of an exposure apparatus according to a second embodiment of the present invention.

FIG. 5 is a plan view of the slit of FIG. 4;

FIG. 6 is a perspective view showing a schematic configuration of an example of a conventional color picture tube exposure apparatus.

FIG. 7 is a cross-sectional view of an example of a conventional color picture tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Slit 2 Mercury lamp 3 Optical correction plate 4 Dimming filter 5 Exposure panel 6A, 6B, 6C Electron beam 7 Polarization yoke 8 Shadow mask opening 9 Electron beam deflection point 11a Green exposure opening 11b Red exposure Hole for blue exposure 11c Hole for blue exposure 12 Roller

Claims (3)

(57) [Claims] 1. A method according to claim 1, wherein a light from a light source is passed through a slit, an optical correction plate, and a light control filter through a shadow mask to irradiate the photosensitive resin or phosphor slurry coating film formed on the inner surface of the panel with the shadow. After printing a dot pattern corresponding to the light transmission of the mask, in a color picture tube exposure apparatus that develops and forms a non-light emitting layer or a phosphor layer, the light source is fixed at a predetermined position, and the slit is an aperture. Having a slit drive mechanism for matching the opening with a predetermined relationship with the light source, and movably provided. The slit drive mechanism provides blue, red, and green light. An exposure apparatus for a color picture tube, wherein the dot pattern is formed in a predetermined arrangement by changing the position of a slit opening for each exposure step for each of three colors. 2. The driving mechanism according to claim 1, wherein the driving mechanism connects the slit to the light source.
Of the slit opening by rotating the rotary shaft parallel to the axis of the
2. The exposure apparatus for a color picture tube according to claim 1, wherein the position is changed. 3. An opening portion of the slit is formed corresponding to exposure of three colors, respectively, and the driving mechanism is provided with the slit.
2. The exposure apparatus for a color picture tube according to claim 1, wherein the position of the slit opening is changed by moving the light source so that the opening corresponding to the color to be exposed matches the light source.