JPH08250026A - Light exposure device and light exposure method - Google Patents

Abstract

PURPOSE: To obtain a light exposure device and a light exposure method, which makes light exposure intensity uniform over the whole area of a panel, and can make a black matrix film provided with an uniform opening section which is turned out to be areas for forming the respective colors of fluorescent substance dots only by adjusting the inclination of a filter in response to the amount of deviation of a light source out of the center of the panel. CONSTITUTION: The device is equipped with a light source 4, a support table which positions a panel mounted with a shadow mask, and rest it, and with a correction lens and a filter 7 located between the aforesaid light source and panel. In the aforesaid light exposure device, the device is also equipped with an inclination mechanisms 8a and 8b which inclines the aforesaid filter 7 by its specified quantity in response to the aforesaid light source 4 at the time of light exposure for forming fluorescent substances for the three colors of red, green and blue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus used for forming a phosphor screen of a color cathode ray tube, and more particularly to forming a black matrix film having a uniform opening which becomes a three-color phosphor dot forming region of a dot type color cathode ray tube. The present invention relates to a suitable exposure apparatus and exposure method.

[0002]

2. Description of the Related Art Generally, in a color cathode ray tube, a phosphor screen in which red, green, and blue phosphor dots are regularly arranged is formed on the inner surface of the panel so as to face a shadow mask mounted inside the panel. . Then, the three electron beams emitted from the electron gun are deflected in the horizontal and vertical directions by the magnetic field formed by the deflection yoke attached to the outside, and the phosphor screen is scanned to emit light to display a color image. There is. Therefore, in order to display a color image with good color purity on this phosphor screen, the respective phosphor dots are arranged uniformly and regularly over the entire screen, and in order to improve the contrast, formation of each phosphor dot is performed. A black matrix film having an opening is formed in the phosphor dot formation region for the purpose of controlling the region and not emitting light between the phosphor dots.

By the way, the formation of the black matrix film having the openings is formed by sequentially exposing and printing through the shadow mask using the same exposure apparatus for each phosphor dot formation region of each color. Therefore, as an exposure device used for forming the black matrix film, since the orbit of the light emitted from the light source is approximated to the orbit of the electron beam to form each phosphor dot forming region by exposure, each phosphor dot forming region is formed. The position of the light source is changed every time.

In this exposure apparatus, as shown in FIG. 4, an orbit of light emitted from the light source 4 is emitted between a panel 1 and a light source 4 which are mounted on a table 3 with a shadow mask 2 mounted thereon. A correction lens 5 for approximating the trajectory of the beam is arranged together with the light control filter 6, and the light source 4 uses the panel 1 during the exposure of the green phosphor dot forming area to be the center dot.
At the position 4G on the center line of, the red and blue phosphor dot forming areas to be the side dots are arranged at positions 4R and 4B displaced from the center line of the panel 1 to the left and right in the arrangement direction of the phosphor dots, respectively. Is being exposed. Therefore, according to this exposure apparatus, when exposing, for example, a blue phosphor dot formation region, the position of the light source 4 is at the position 4B displaced leftward from the center of the panel 1 as shown in FIG. The distances D1 and D2 between the left side portion 1L and the right side portion 1R and the light source 4 are D1 <D2, and the relationship between the exposure intensities L1 and L2 of the left side portion 1L of the panel 1 and the right side portion 1R is L.
Since 1> L2, the area of the opening of the black matrix film becomes nonuniform.

Therefore, as disclosed in JP-A-64-38942, a dimming filter whose light transmittance distribution is asymmetric with respect to the center of the dimming filter is used, and blue and red of side dots are used. When the phosphor dot formation area is exposed, the dimming filter is arranged 180 ° symmetrically with respect to the displacement of the light source, and when the light source at the center dot green phosphor dot exposure is located at the center, the dimming control is performed. A method of exposing by rotating a filter has been proposed.

[0006]

However, in the above-mentioned exposure method, since the light transmittance distribution changes depending on the displacement amount of the light source, there are several kinds of light transmittance distributions depending on the size of the panel and the characteristics of the exposure apparatus. There is a problem that it is necessary to prepare an optical filter, and a complicated work is required to replace or adjust the light control filter. Further, it is also difficult to manufacture a dimming filter having an asymmetric light transmittance distribution with high precision, and a complicated mechanism such as a rotating mechanism of the dimming filter when the light source position is located in the center is required. there were.
The object of the present invention corresponds to the displacement amount from the center of the light source,
By simply adjusting the amount of inclination of the light control filter, the exposure intensity can be made uniform over the entire panel surface, and a black matrix film having uniform openings to become phosphor dot forming regions of each color can be formed. An object is to provide an exposure apparatus and an exposure method that are simple and have good workability.

[0007]

According to the present invention, there is provided a light source, a table on which a panel having a shadow mask mounted thereon is positioned and mounted, a correction lens is provided between the light source and the panel, In an exposure device equipped with a light control filter, movable means for holding the light control filter by inclining a predetermined amount respectively corresponding to the position of the light source at the time of exposure for forming three color phosphors of red, green and blue. Provided is an exposure apparatus provided. Further, the movable means comprises a holder of the light control filter and a tilting mechanism of the holder, or the movable means has a rotary table in which three light control filters are arranged by pretilting a predetermined amount, and It is desirable that it comprises a mechanism for rotating the rotary table to position and hold the light control filter at a predetermined position.

Further, according to the present invention, a panel having a shadow mask is positioned and placed on a table, and the position of the light source is changed between the light source and the panel via a correction lens and a dimming filter. In the exposure method for forming a black matrix film having openings for sequentially forming red, green, and blue three-color phosphors, the position of the light source at the time of exposure for forming red, green, and blue three-color phosphors Corresponding to the above, there is provided an exposure method of exposing each of the light control filters by inclining them by a predetermined amount.

[0009]

According to the above construction, the light control filter has a characteristic that the light transmittance increases when it is brought closer to the light source, and decreases when it is moved farther away. To move away, that is, when the red phosphor dot forming area where the light source is displaced to the right is exposed, it goes down to the left,
When exposing the blue phosphor dot forming area where the light source is displaced to the left side, tilt the dimming filter respectively to the lower right, and hold the dimming filter horizontally when exposing the green phosphor dot forming area in the center of the light source. It is possible to form the black matrix film having the openings of the phosphor dot forming regions of the respective colors that are uniform over the entire panel surface. Therefore, it is not necessary to prepare a dimming filter having several kinds of transmittance distributions depending on the size of the panel and the characteristics of the exposure apparatus, and it is not necessary to replace or adjust the dimming filter, and to manufacture asymmetrical light transmittance distributions. It is not necessary to manufacture a difficult light control filter, and it is possible to provide an exposure apparatus having a simple configuration that does not require a complicated mechanism such as a rotation mechanism of the light control filter when the light source position is located in the center.

[0010]

EXAMPLES Examples of the exposure apparatus of the present invention will be described below.
This will be described with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The exposure apparatus of one embodiment of the present invention is configured in the same manner as the conventional example except for the light control filter section, and the light control filter 7 includes a light source 4 as shown in FIG.
Is attached to a holder 9 provided with tilting mechanisms 8a and 8b capable of vertically moving the positions of both ends in the displacement direction of. The black matrix film is formed by the exposure apparatus of this embodiment as follows. That is, as shown in FIG. 2, during exposure of the green phosphor dot forming region where the light source 4 is located at 4G on the center line of the panel, the holders 9 are set so that the positions of the tilting mechanisms 8a and 8b at both ends are at the same height. While holding it horizontally, the light control filter 7 is disposed horizontally (FIG. 2a), and when the blue phosphor dot forming area at the position 4B where the light source 4 is displaced to the left is exposed, the tilting mechanism 8a at the left end is raised. , The right end tilting mechanism 8b is lowered, the holder 9 is tilted downward to the right and held, the light control filter 7 is tilted by a predetermined amount (FIG. 2b), and the light source 4 is displaced to the right at the 4R position. At the time of exposure to the red phosphor dot forming area at, the tilting mechanism 8a at the left end portion is lowered, the tilting mechanism 8b at the right end portion is raised, and the holder 9 is held tilted downward to the left and held.
Are tilted by a predetermined amount (FIG. 2c) and exposed.

By performing the exposure as described above, the intensity of the exposure intensity on the inner surface of the panel caused by the change in the distance between the light source and the inner surface of the panel due to the displacement of the light source causes the light transmission depending on the distance from the light source of the light control filter. The opening of the black matrix film is formed with uniform exposure intensity over the entire inner surface of the panel, which is corrected by the increase or decrease of the rate. An exposure apparatus according to another embodiment of the present invention is
As shown in FIG. 3, a rotary table 10 in which three dimming filters 7a, 7b, 7c are respectively arranged horizontally, downwardly to the right, and downwardly to the left is provided. At the time of exposure of the body dot formation area, the rotary table 10 can be rotated to easily dispose a predetermined light control filter at the exposure position, and similar to the above-described embodiment, a uniform opening is formed on the entire inner surface of the panel. A black matrix film having the same can be formed.

As described above, the opening which becomes the three-color phosphor dot forming region in the left-right direction is provided by the exposure device having the tilting mechanism for moving up and down both ends of the holder of the light control filter and the rotary table in which the three light control filters are disposed in the tilted manner. Although the example of forming the black matrix film in which the parts are arranged has been described, the present invention is not limited to the above example. For example, a mechanism for rotating and tilting a rotating shaft provided at the center of the holder of the light control filter as a center is provided. The variation of the exposure intensity caused by the difference in the distance between the light source and the panel due to the displacement of the light source, such as the formation of phosphor dots in which the arrangement of the three-color phosphor dots is arranged in a triangular shape with the exposure device provided, It can also be applied to those that are corrected by inclination.

[0013]

According to the present invention, it is not necessary to prepare a dimming filter having several kinds of transmittance distributions depending on the size of the panel and the characteristics of the exposure apparatus, and it is not necessary to replace or adjust the dimming filter. It is not necessary to manufacture a dimming filter that has a difficult light transmittance distribution that is difficult to manufacture, and exposure with a simple structure that does not require a complicated mechanism such as a rotating mechanism of the dimming filter when the light source position is located in the center The apparatus can form a black matrix film having a uniform opening of each color phosphor dot formation region, and can provide a color cathode ray tube having a phosphor screen in which normal phosphor dots are arranged over the entire screen.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a light control filter section of an exposure apparatus that is an embodiment of the present invention.

2A to 2C are schematic cross-sectional views for explaining the positional relationship between the light control filter and the light source in the present invention.

FIG. 3 is a schematic perspective view of a light control filter section of an exposure apparatus according to another embodiment of the present invention.

FIG. 4 is a schematic sectional view of a conventional general exposure apparatus.

FIG. 5 is a schematic sectional view for explaining a change in exposure intensity depending on the position of a light source.

[Explanation of symbols]

 4 Light source 7, 7a, 7b, 7c Light control filter 8a, 8b Inclination mechanism 9 Holder 10 Rotating table 4G Position of light source when exposing green phosphor dot 4B Position of light source when exposing blue phosphor dot 4R Red phosphor dot exposure Position of the light source at time

Claims (4)

[Claims] 1. An exposure apparatus comprising a light source, a table disposed above the light source and a panel on which a shadow mask is mounted and positioned and mounted, and a correction lens and a dimming filter between the light source and the panel. An exposure apparatus, which comprises movable means for holding the light control filters by inclining them by a predetermined amount in correspondence with the position of the light source at the time of exposure for forming three-color phosphors of red, green, and blue. . 2. The exposure apparatus according to claim 1, wherein the movable means comprises a holder for a light control filter and a tilting mechanism for the holder. 3. The movable means is tilted in advance by a predetermined amount, and
2. The exposure apparatus according to claim 1, comprising a rotary table on which a plurality of light control filters are arranged, and a mechanism for rotating the rotary table to position and hold the light control filter at a predetermined position. 4. A panel equipped with a shadow mask is positioned and placed on a table, and the position of the light source is sequentially changed between a light source and the panel through a correction lens and a light control filter, and red, green, and In an exposure method for forming a black matrix film having an opening to be a blue three-color phosphor forming region, the adjustment is performed corresponding to the position of the light source at the time of exposure for forming the red, green and blue three-color phosphors. An exposure method, which comprises exposing the optical filter by inclining it by a predetermined amount.