JP3119112B2 - Exposure method - 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 and an exposure method for forming a fluorescent screen of a color cathode ray tube, and more particularly, to an exposure pattern in a horizontal axis direction of a screen which is formed asymmetrically with respect to a center axis of a panel, and which uses an electron beam by geomagnetism. The present invention relates to an exposure apparatus and an exposure method suitable for forming a phosphor screen that is aligned with a beam landing pattern.

[0002]

2. Description of the Related Art In general, as shown in FIG. 3, a shadow mask type color cathode ray tube is provided on an inner surface of a panel 2 constituting a front portion of an envelope 1 so as to face a shadow mask 3 disposed inside the panel. As a result, a fluorescent screen 4 is formed, and an electron beam emitted from an electron gun 5 disposed at the neck of the envelope 1 is deflected by a magnetic field by a deflection yoke 6, and the fluorescent screen 4 is The image is displayed on the phosphor screen by scanning. The fluorescent screen of this color cathode ray tube is formed by a photoengraving method. That is, a phosphor slurry containing a phosphor, polyvinyl alcohol and dichromate as main components is applied to the inner surface of the panel, dried to form a phosphor slurry layer, and then a shadow mask is attached to the exposure apparatus. Exposure. After the exposure is completed, the phosphor slurry layer is developed to form a phosphor layer that is baked through the electron beam passage holes of the shadow mask. The phosphor layers are sequentially formed for the three colors of R and GB to form a phosphor screen composed of the three color phosphor layers R, G and B.

As shown in FIG. 4, an exposure apparatus used for forming the three-color phosphor layer includes a table 7 for positioning and supporting a panel 2 as disclosed in Japanese Patent Application Laid-Open No. 1-283736. In order to form a three-color phosphor layer via the shadow mask 3 in which the electron beam passage holes are arranged in a predetermined pattern,
A light source 9 is formed by arranging a long light-emitting body 8 such as an ultra-high pressure mercury lamp whose longitudinal direction is the vertical axis direction of the screen. The exposure apparatus includes a correction lens 10 for approximating the trajectory of light from the light source 9 to the trajectory of the electron beam, and a panel 2.
A light control filter 11 for correcting the light amount distribution with respect to the inner surface is provided between the panel 2 and the light source 9. As shown in FIG. 5, the light source 9 is provided with a slit plate 13 having an opening 12 having an arc-shaped outer peripheral portion whose longitudinal direction is perpendicular to the longitudinal direction of the luminous body 8.

[0004]

However, in the exposure by the exposure apparatus having the above-described structure, the adjustment of the exposure pattern in the horizontal axis direction of the phosphor screen serving as the screen can be adjusted and set by the length of the opening. The exposure pattern in the vertical axis direction at the central portion and the peripheral portion in the axial direction cannot be adjusted. However,
When used in the northern hemisphere and when used in the southern hemisphere, the landing pattern of the electron beam is in the peripheral portion of the screen S as shown in FIG. In the southern hemisphere magnetic field, the right side of the horizontal axis moves in a direction in which the right side becomes wider in the vertical direction, and the left side moves in a direction in which the left side becomes narrower in the vertical direction. Therefore, it is necessary to prepare a correction lens that does not match the exposure pattern of the phosphor and to match the landing pattern of each electron beam, and to adjust the purity according to the place of use. However, there is a problem in that the color cathode ray tube cannot cope with the correction lens alone, and it is difficult to adjust the purity.

An object of the present invention is to solve the above-mentioned problem by disposing the apparent position of the light source at the outer periphery of the slit asymmetrically so that the exposure pattern in the horizontal axis direction of the screen can be shifted to the center axis of the panel. It is an object of the present invention to provide an exposure apparatus and an exposure method which are formed asymmetrically with respect to the laser beam and are suitable for forming a phosphor screen which is matched with a landing pattern of an electron beam due to terrestrial magnetism.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a light source having a slit plate formed with an opening and an arc-shaped outer peripheral portion orthogonal to a long light-emitting body which is long in a vertical axis direction of a screen, and positioning and mounting the panel. A table, and an exposure apparatus provided with a correction lens and a light control filter between a light source and a panel, wherein a means for arranging the arc-shaped outer peripheral portion of the slit plate symmetrically or asymmetrically in the longitudinal direction with respect to the center of the opening is provided. An exposure apparatus is provided. Further, the means for arranging the outer peripheral portion of the slit plate symmetrically or asymmetrically in the longitudinal direction with respect to the center of the opening is configured to rotate and arrange the slit plate having the parabolic outer peripheral portion in the longitudinal direction of the opening. It is desirable to have.
In addition, a phosphor screen having a predetermined arrangement of phosphor layers on the inner surface of a panel of a color cathode ray tube is provided by a light source having a slit plate formed with an opening and an arc-shaped outer periphery orthogonal to a long light-emitting body that is long in a vertical axis direction of a screen. In the exposing method, the arc-shaped outer peripheral portion of the slit plate is arranged and exposed symmetrically or asymmetrically in the longitudinal direction with respect to the center of the opening, and the exposure pattern in the horizontal axis direction of the screen is exposed to the panel central axis. An exposure method for forming an asymmetric arrangement of phosphor screens is provided.

[0007]

According to the above arrangement, exposure can be performed by disposing the outer peripheral portion of the slit plate symmetrically or asymmetrically in the longitudinal direction with respect to the center of the opening. Therefore, during the exposure for forming the fluorescent screen of the color cathode ray tube used in the environment of the neutralizing magnetic field which is not affected by the terrestrial magnetism, if the exposure is performed by symmetrically arranging the outer peripheral portion of the slit plate at the center of the opening, the exposure landing The pattern can be formed symmetrically at the center of the screen. In addition, the landing pattern of the electron beam is such that the right side of the screen approaches the central axis in the horizontal direction and the left side is asymmetric so that the left side is away from the central axis. If the slit plate is rotated about the tube axis of the illuminant and the opening is inclined to the right and arranged for exposure, the exposure landing pattern is formed in the direction coinciding with the electron beam landing pattern. At the time of exposure for forming the fluorescent screen of the color cathode ray tube used in the environment of the southern hemisphere magnetic field, if the slit plate is rotated around the tube axis of the illuminator, and the opening is inclined to the left and exposed,
An exposure landing pattern in a direction coinciding with the landing pattern of the electron beam by the southern hemisphere magnetic field is obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. The overall configuration of the exposure apparatus for a color cathode ray tube according to the present invention is substantially the same as that of the conventional one, and is characterized by the configuration of the slit plate of the light source. That is, the light source 14
As shown in FIG. 1, a slit plate 15 of a predetermined width and length having a parabolic outer periphery is provided along the outer periphery of a long luminous body 8 formed of an ultra-high pressure mercury lamp, and the slit plate 15 is During the exposure, the luminous body 8 is set by the setting handle 16.
It is configured to be able to set by rotating by a predetermined angle around the tube axis of. According to the exposure apparatus of this embodiment, as shown in FIG. 2, during exposure for forming a fluorescent screen of a color cathode ray tube used in a neutralizing magnetic field environment unaffected by terrestrial magnetism, the slit plate 15 If exposure is performed symmetrically at the center, the exposure landing pattern 17 can be formed symmetrically at the center of the screen (FIG. 2A). Also, during the exposure for forming the fluorescent screen of the color cathode ray tube used in the environment of the northern hemisphere magnetic field in which the landing pattern of the electron beam is such that the right side of the screen S approaches the central axis in the horizontal direction and the left side asymmetrically moves away from the central axis. If the slit plate 15 is rotated about the tube axis of the light emitting body 8 and the opening is inclined to the right side and exposed, the exposure landing pattern 18 is formed in the direction coinciding with the landing pattern of the electron beam. (FIG. 2B). At the time of exposure for forming the fluorescent screen of the color cathode ray tube used in the environment of the southern hemisphere magnetic field, the slit plate 15 is rotated around the tube axis of the luminous body 8 and the opening is inclined to the left to expose. , An exposure landing pattern 19 in a direction coinciding with the landing pattern of the electron beam by the southern hemisphere magnetic field is obtained.

As described above, according to this embodiment, a color cathode ray tube having a phosphor screen that matches the landing pattern of an electron beam due to the influence of the terrestrial magnetism can be obtained only by inclining the slit plate by a predetermined amount. A color cathode ray tube whose purity can be easily adjusted without preparing a lens can be provided. Above, an example of an exposure apparatus and an exposure method having a light source that can rotate a slit plate having a parabolic arc-shaped outer peripheral portion around a tube axis of a light emitting body and arrange openings symmetrically or asymmetrically, The present invention is not limited to this example. For example, an opening device such as an exposure apparatus in which three types of slit plates are arranged on a rotating disk and this disk is rotated to allow a predetermined slit plate to be switched and arranged on the luminous body. An exposure apparatus having a configuration in which the parts can be arranged symmetrically or asymmetrically as required may be used.

[0010]

According to the exposure apparatus and the exposure method of the present invention, the color having the phosphor screen which matches the landing pattern of the electron beam under the influence of the terrestrial magnetism can be obtained simply by switching the opening of the slit plate symmetrically or asymmetrically. Since a cathode ray tube is obtained, it is possible to provide a color cathode ray tube whose purity can be easily adjusted without preparing various kinds of correction lenses.

[Brief description of the drawings]

FIG. 1 is a perspective view of a light source of an exposure apparatus according to an embodiment of the present invention.

FIGS. 2A and 2B are views of a screen for explaining an exposure pattern formation by the exposure apparatus of the present invention. FIG. 2A shows a color cathode ray tube for a neutralizing magnetic field. FIG. 2B shows a color cathode ray tube for a northern hemisphere magnetic field. Color cathode ray tube

FIG. 3 is a cross-sectional view of a general color cathode ray tube.

FIG. 4 is a schematic cross-sectional view showing a configuration of a general exposure apparatus.

FIG. 5 is a perspective view of a light source of a conventional exposure apparatus.

FIG. 6 is a diagram of a screen for explaining a landing pattern of an electron beam in a geomagnetic environment.

[Explanation of symbols]

2 Panel 3 Shadow mask 4 Phosphor screen 8 Light-emitting body 10 Correction lens 11 Dimming filter 14 Light source 15 Slit plate 16 Setting handle (means for disposing the slit plate asymmetrically) S screen

Claims (1)

(57) [Claims] A phosphor layer is arranged in a predetermined arrangement on the inner surface of a panel of a color cathode ray tube by a light source having an opening perpendicular to a long light emitting body long in a vertical axis direction of a screen and a slit plate formed in an arc-shaped outer peripheral part. In an exposure method for forming a phosphor screen, an arc-shaped outer peripheral portion of the slit plate is arranged and exposed in a longitudinal direction with respect to a center of the opening, and an exposure pattern in a horizontal axis direction of a screen is aligned with a panel central axis. An exposure method, wherein a phosphor screen having an asymmetric arrangement is formed.