JPH06223713A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To carry out a numerous sort and small quantity production economically, easily, and at a high yield, by providing plural automatic quick disconnecting devices for panel and shaft, an automatic transfer device, and an exposing device to operate full-automatically including the regulation of the parts of the devices. CONSTITUTION:A means to control and to manage the full process of forming a fluorescent screen of the panel inner surface of a cathode-ray tube automatically is provided. Plural sets of automatic quick disconnecting devices 16 and 17 to install or to separate a shadow mask to a panel automatically under the management of the above means, and an automatic transfer device to transfer to a conveying device in order to render a specific combination of both members at any time are provided. Furthermore, an exposing device 1 to operate full-automatically devices 2 to 10 to form a black matrix and phosphor film group of three primary colors on the inner surface of the panel by using a means to discriminate and store the sorts and the specifications of the tube concurrently, including the regulation of the parts, is provided. And the exposing for the forming works is carried out in order automatically without using the manual work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic manufacturing method suitable for small-lot production of a wide variety of high-definition color cathode ray tubes and the like, which are large in size and still in relatively low demand.

[0002]

2. Description of the Related Art Since the use and usage of color cathode ray tubes have expanded more and more in recent years, at least for the black matrix, at least in the process of forming the fluorescent surface on the inner surface of the panel of the color cathode ray tube, A line of fully-automatic manufacturing devices, each equipped with a dedicated exposure device for the three primary color phosphor films, a total of four exposure devices, and having a continuous seat designation type, has been generally used. In such a line, for example, 6 consecutive seats are usually used at the same time, and a total of about 24 exposure apparatuses are common.
One type of color cathode ray tube can be easily manufactured in 400 to 1000 pieces per day.

In the case where a single product type is easily mass-produced but the product type is switched by the above-mentioned automatic line, at least one exposure device for black matrix, three for fluorescent film and a total of four exposure devices are used. It requires switching, and requires a huge number of man-hours. When switching to a product with significantly different specifications,
Unless the corresponding dimensions are perfectly matched among the four exposure apparatuses, the holes of the black matrix (actually, these holes emit light on the screen of the fluorescent film located thereunder, that is, on the electron gun side). (Which affects the area) may deviate from the position of the fine fluorescent film, and especially in the case of ultra-high definition tubes, etc., for which demand is increasing in recent years, it is necessary to perform the above switching and adjustment. Even the days were even needed. In addition,
The black matrix is formed by first forming a photoresist film on the inner surface of the panel, exposing it through the holes of the shadow mask combined with the panel, and leaving the photoresist film at the exposed portions, and then the black matrix graphite on the entire surface. After forming a film, the photoresist film is developed and exfoliated, and the graphite film corresponding to the holes formed so as to overlap the photoresist film is lifted off together with the photoresist film.

[0006] Further, although the black matrix and the fluorescent substance film were formed on the same exposure apparatus in some cases as a trial or an experiment, as shown in FIG. 2, a black matrix forming photoresist was used. The film thickness is about 1 μm, whereas the film thickness of the photosensitive phosphor film is about 30 μm. However, when exposing the phosphor film, it was necessary to bring the exposure light source closer to the panel by 0.3 to 0.6 mm. In FIG. 2, 11 is the inner surface of the panel, 12 is the shadow mask, 12a is the center of the holes of the shadow mask, 13a is the center of the light source at the time of exposure of the photoresist film for forming the black matrix, and 13b is the time of exposure of the fluorescent film. The center of the light source, 13c is the variation size of the center position of the light source corresponding to the film thickness difference of the film to be exposed, 14 is the fine phosphor film of one primary color, 14a is the exposure center of the fine phosphor film at the time of exposure, 15
Is a black matrix, and 15a is an exposure center at the time of exposure to the photoresist film for forming a black matrix. Further, in the case of a dot-type fluorescent surface, the diameter of the fluorescent substance film dot formed on the electron gun side is larger than the hole diameter of the black matrix, and therefore the diameter of the exposure light source must be different, and Currently, the mainstream is the in-line method in which electron guns for each color are arranged slightly apart on one plane in the direction in which the electron beams for the three primary colors are focused on the fluorescent surface. It is arranged so as to correspond to the center of the panel, and the light source position is shifted laterally from the center of the panel for red and blue devices. Conventionally, for mass production equipment, for black matrix formation and phosphor film formation. For use,
It has become common to use different dedicated exposure devices.

[0005]

Although it can be said that ordinary color cathode ray tubes are now completely mass-produced products, on the other hand, diversification of varieties also progresses, and it is necessary to mass-produce all tube types. Do not mean. There are varieties that can produce less than 1000 pieces per month, such as ultra-high-definition tubes that have a very high definition and are not in much demand yet. If they are manufactured in the mass production equipment as described above, the switching man-hours will be too much and it will not be possible. It was economical, and the trial production facility had problems such as poor yield and too many man-hours.

According to the present invention, the above problems do not occur,
An object of the present invention is to provide a manufacturing method of a color cathode ray tube capable of efficiently producing a wide variety of products in small quantities, including products with high specifications, with a high yield.

[0007]

In order to solve the above problems, the present invention comprises means for automatically controlling and managing all steps of forming a fluorescent surface on the inner surface of a panel of a color cathode ray tube. Under control, automatically attach a shadow mask to the panel, or separate the shadow mask already attached to the panel from the panel, a plurality of sets of automatic attachment / detachment devices, a specific panel, and a specific first attached to it. The panel and the shadow mask are synchronized with the movement of both so that the combination with the shadow mask of can be reproduced at any time when desired.
Separately, a plurality of automatic transfer devices that are placed on or removed from the transfer device are used together with a means for automatically identifying and storing the type and specifications of pipes when they are put into the process, and , A black matrix and a group of fine fluorescent film for each of the three primary colors are formed by a photolithography technique, and an exposure apparatus that automatically operates including adjustment of each part of the apparatus necessary for each forming operation described above. With one unit, the exposure for each forming operation was sequentially and completely automatically performed without using any manpower.

In practice, in practice, the exposure apparatus uses a phosphor film corresponding to the film thickness difference between the relatively thin black matrix forming photoresist film and the relatively thick photosensitive phosphor film. At the time of exposure, the distance from the light source of the exposure device to the panel is automatically shortened by a predetermined length as compared with the time of exposure of the photoresist film (for this reason, for example, a predetermined thickness is provided in the optical path from the light source of the exposure device to the panel. , A glass flat plate with a predetermined refractive index is automatically inserted in parallel with the panel seal surface) mechanism, or in-line type electron gun compatible with the light source position at the time of exposure according to the color type of the phosphor film, In the center of green, when red and blue, a mechanism to automatically move to the opposite lateral side, respectively, is provided.In order to stabilize the exposure light source for a long time, Light source for exposure equipment when forming a fluorescent surface Then, the long arc ultra-high pressure mercury lamp is covered with an approximately semi-cylindrical or flat shading plate installed at a specified distance from the arc, and the shading plate is orthogonal to the mercury lamp tube axis (that is, the arc length direction). A slit for light transmission is provided, and all of these are arranged in a direction orthogonal to the tube axis of the mercury lamp.
It is swung by a stroke determined according to the type of pipe, and the slit width is variable according to the stroke length of the swing.
Further, both or one of the slit width and the stroke length of the swing of the light shielding plate is automatically changed according to the tube type during the exposure of the photoresist film and the exposure of the photosensitive fluorescent substance film. Installed by adding a mechanism.

[0009]

[Function] Before and after each exposure operation, it is necessary to apply a photoresist film and each color fluorescent film and to develop and remove these films. Therefore, automatic transfer used for transportation to and from these work points. It may be necessary to add the equipment and the necessary automatic attachment / detachment equipment before and after this equipment, but the initial installation price of the exposure equipment, especially the lens system is expensive, or when the prototype equipment is manually transported. Considering the soaring wages of the workers in the above, it is enough to get the price. In addition, the optical lens system used in the exposure apparatus is very delicate, and as a result, it is easy for each exposure table to have its own peculiarity, which has conventionally been a cause of requiring a long time to switch the product type. In the present invention, there is only one exposure apparatus
Since there is only a table, even if the optical system has a habit, the work of adjusting to adapt to the habit only needs to be performed once for each product type. Therefore, the adjustment work can be optimally performed, and the product yield is improved.

[0010]

EXAMPLES When actually implementing the present invention, in a factory where a large number of automatic mass production lines as described above are already installed,
For example, 24 used in one of these automatic mass production lines
Each of the exposure apparatuses is newly modified by adding new necessary equipment to the exposure apparatus according to the present invention to produce a variety of products such as 2
It is more economical to use a line that enables parallel production of four types of products (for example, the automatic attachment / detachment device, the automatic transfer device, and the transfer device can be used as they are). FIG. 1 shows an example in which a production line for high-mix low-volume production has been remodeled to accommodate a cathode ray tube for ultra-high definition color graphics with a pitch of 0.28 mm or less. This line has an index time of 30 seconds
With 24 seats and 24 types, the number of starts per seat is 120. 24 in actual use
Any number of products may be used as long as they are less than or equal to the product type, and if a plurality of seats are assigned to the same product according to the required number of productions, it is possible to finely correspond to the production plan. In FIG. 1, 1 is an automatic exposure apparatus according to the present invention, and 24 automatic development apparatuses attached to the automatic exposure apparatus, which collect the waste liquid for each type of film by removing the unexposed uncured portion from each exposed film. Automatic exposure line equipped with transfer device, 2 photoresist coating machine (12 positions), 3 graphite film coating machine (24 positions), 4 green fluorescent film coating machine (24 positions), 5 red color Fluorescent film coating machine (24 positions), 6 is a blue fluorescent film coating machine (24 positions), 7 is a panel cleaning machine (12 positions), 8 is a leaving place (30 positions), 9 is a metal back to be performed later. A filming machine (24 positions) for forming a smooth and easily thermally decomposed organic smooth film on a film such as a fluorescent substance prior to film formation is a shadow mask cleaning machine. In addition, a shadow mask is combined with the panel when it is put into the fluorescent surface forming line. An automatic shadow mask mounting device 16 and an automatic shadow mask detaching device 17 are arranged at the illustrated positions.

As described above, in order to modify the exposure apparatus, a lens system switching mechanism corresponding to the three primary colors of the fluorescent substance (for the photoresist film for forming a black matrix, the position corresponding to the panel center in the present invention is also used). This is the same as the conventional equipment that arranges a light source and exposes only once), and a mechanism that moves the light source position laterally during exposure according to the type of color of the phosphor film that supports in-line electron guns. To shorten the distance between the light source and the panel at the time of exposing the optical film by about 0.3 to 0.6 mm corresponding to the film thickness difference between the black matrix and the fluorescent film (for example, insert a glass flat plate into the optical path). Mechanism, mechanism that switches the light amount correction filter to correct and uniform the exposure illuminance fluctuation due to the distance change from the light source on the panel surface, slit width of the light shield plate of the long arc ultra-high pressure mercury lamp and the stroke length of oscillation Additional installation of such mechanism for switching depending on varieties is required. The long arc ultra-high pressure mercury lamp is used as a dot-type light source for forming the fluorescent surface because it uses a slit in the light-shielding plate. High-pressure mercury lamps require direct-current lighting and a light source position fluctuation correction device, and have a relatively short life and high price.
This is because the long arc ultra-high pressure mercury lamp can be lit by alternating current, has a long life, and is extremely convenient for manufacturing a television picture tube using a striped fluorescent surface.

[0012]

As described above, according to the present invention, it is possible to economically and relatively easily produce a large quantity of a wide variety of products suitable for a slightly special color cathode ray tube in the present situation that the production quantity is relatively small. You will be able to perform with a high yield.

[Brief description of drawings]

FIG. 1 shows a schematic structure of a fluorescent surface forming line for multi-product small-quantity production in which an existing fluorescent surface forming line for six mass-produced single products is modified into a line capable of simultaneous parallel production of 24 kinds according to the present invention. It is a figure.

FIG. 2 is a diagram showing that it is necessary to change the distance between the light source and the panel during exposure of the photoresist film for forming a black matrix and during exposure of the photosensitive fluorescent substance film.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Automatic exposure line consisting of 24 automatic exposure devices according to the present invention and devices associated therewith, 2 ... Photoresist coating machine, 3 ... Graphite film coating machine, 4 ... Green fluorescent film coating machine,
5 ... Red fluorescent film coating machine, 6 ... Blue fluorescent film coating machine, 7 ... Panel cleaning machine, 8 ... Standing place, 9 ... Filming machine, 10 ... Shadow mask cleaning machine, 16 ...
Automatic shadow mask mounting device, 17 ... Automatic shadow mask detaching device.

Claims (3)

[Claims] 1. A plurality of automatic attachment / detachment devices for automatically attaching a shadow mask to a panel or separating an already attached shadow mask from a panel in a step of forming a fluorescent surface on the inner surface of the panel of a color cathode ray tube. , A plurality of automatic transfer devices for separately loading or unloading the panel and the shadow mask on a carrier device while synchronizing the movement of both the particular panel and the particular shadow mask initially attached to it. And a means for automatically identifying and storing the type and specification of the tube at the time of inputting into the process, a black matrix and three groups of fluorescent film groups are formed on the inner surface of the panel by photolithography technology. In order to do so, the exposure for each forming operation is sequentially and completely automatically performed by one exposure apparatus that automatically operates according to each forming operation. Color cathode ray tube manufacturing method which is characterized in that the. 2. An exposure device during exposure of a fluorescent film compared to during exposure of a photoresist film, corresponding to a film thickness difference between a relatively thin photoresist film for forming a black matrix and a relatively thick photosensitive phosphor film. 2. The method of manufacturing a color cathode ray tube according to claim 1, wherein the distance from the light source to the panel is automatically shortened by a predetermined length. 3. A long arc ultra-high pressure mercury lamp is separated from an arc for a specified length as a light source of an exposure device for forming a fluorescent surface composed of dot-shaped three-color fluorescent films repeatedly arranged in a predetermined order. It is covered with a semi-cylindrical or flat light-shielding plate that is installed on the light-shielding plate, and the light-shielding plate is provided with a slit for light transmission orthogonal to the axis of the mercury lamp tube. 3. A structure is used in which a corresponding stroke is determined and the slit width is made variable according to the stroke length of the oscillation.
A method for manufacturing the described color cathode ray tube.