JPS6337533A - Manufacturing device for phosphor screen of cathode-ray tube - Google Patents

Abstract

PURPOSE:To aim at abatement in developing unevenness, by installing a developing nozzle device made so as to perform stationary reciprocating motion in an array direction of supply openings and a direction orthogonal with this array direction or its one direction and a holding device for a panel making a panel perform its constant speed or intermittent rotational motion centering on the axial center. CONSTITUTION:In this device, there is provided with a panel which holds a panel 1 trying to form a phosphor screen in opposition to a nozzle device 12. This panel holding device 16 is constituted so as to cause the inner surface to be opposed right to an array part of supply openings 11 of the nozzle device 12, namely, a feed pipe 13 and to accord an axial center of the panel 1 with an axis A-A, and to have such a function as to rotate centering on this axial center. The panel holding device 16 is driven, and makes the supply opening 11 perform reciprocating rotation at an angle thetacentering on a straight line L3 according to the feed pipe 13 of the nozzle device 12 while rotating the panel 1 on the axis A-A, while effusion of a developer is carried out toward an inner surface of the panel 1 while doing stationary reciprocating drive with each width Wv along a straight line L1. With this constitution, concentration unevenness is eliminable, thus a high-grade color phosphor screen is securable.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an apparatus for producing a fluorescent surface of a cathode ray tube, and particularly a method for producing a color fluorescent surface of a cathode ray tube by optical baking after pattern exposure treatment on a photosensitizer. The present invention relates to an apparatus for producing a fluorescent surface of a cathode ray tube that performs development, for example, water development.

[Summary of the invention]

The present invention provides a device for producing a fluorescent surface of a cathode ray tube in which development is carried out by spraying a developing solution onto a photosensitizer in the process of producing a fluorescent surface of a cathode ray tube. By moving the panel, rotating the panel, and specifying the relationship of movement between the two, it is possible to perform uniform development over a wide area.

[Conventional technology]

When manufacturing a color phosphor surface for a color cathode ray tube, in the completed cathode ray tube, each electron beam corresponding to, for example, red, green, and blue must land correctly on the corresponding color phosphor pattern on the phosphor surface. It is necessary to paint the fluorescent patterns of each color separately to make it possible.

Therefore, as a method for forming such a color phosphor surface, the means for determining the electron beam arrival position, such as a shadow mask or an aperture grill, which is disposed opposite to the color phosphor surface in a completed cathode ray tube, itself is optically A widely used method of masking is to optically print phosphors of each color and apply different colors.

For example, when producing a color phosphor surface in which a light absorption layer, so-called guard band, for example, a carbon coating film is formed between red, green, and blue phosphor stripes, first, a photosensitizer is applied to the inner surface of the panel part of the cathode ray tube body. For example, PVA (polyvinyl alcohol) to which a photosensitizer has been added is applied, dried, and then an electron beam arrival position determining means, such as an aperture grill, is attached to a predetermined position on the inner surface of the panel, and this is used as an optical mask for correction. Pattern exposure is performed using light whose optical path has been corrected in accordance with the electron beam using a lens, etc. After that, the electron beam arrival position determining means is removed, and the photosensitive material on the inner surface of the panel that has been pattern exposed is developed by spraying water. The parts that were not exposed to light and hardened, that is, the parts that were not exposed to the red, green, and blue electron beams, were removed, and then carbon paint was applied to the entire surface, dried, and the photosensitizer was removed. A light-absorbing guard band made of the carbon coating is formed by performing reversal development that selectively removes the carbon coating on the photosensitive agent along with the photosensitive agent while leaving the carbon coating in the areas to which no agent is attached. Thereafter, a photosensitive agent mixed with a phosphor of one color, for example, a green phosphor, is applied to the entire surface including the guard band formed in the predetermined pattern, dried, and the process is repeated as described above. An electron beam landing position determining means is attached to a predetermined position on the panel, and the electron beam landing position determining means is used as an optical mask to replace the green electron beam with light to determine the landing position of the electron beam at the edge of the completed cathode ray tube. Only the corresponding portions are selectively exposed, ie, pattern exposed, to harden the exposed portions. Thereafter, the electron beam arrival position determining means is removed, and water is sprayed onto the photosensitive agent having the green phosphor to perform a development process in which the portions of the photosensitive agent that have not been exposed and hardened are washed away. A green phosphor pattern in a predetermined pattern is formed, and then similar steps are followed to optically bake and develop other colored phosphors, such as blue phosphor, and then further colored phosphors are formed. Optical printing of a pattern of phosphors, such as red phosphors, is performed and developed to produce a color phosphor surface in which phosphors of each color are formed in a predetermined pattern. When using this method of producing a color fluorescent surface, formation of guard hands,
Furthermore, pattern exposure to a photosensitizer and subsequent water development are performed to form edges of each color, red and blue phosphor patterns.

For example, as shown in FIG. 7, an apparatus for performing such a water development may be used such that the center of the panel (1) is placed opposite the inner surface of the panel fl1 of the cathode ray tube body on which the color fluorescent surface is to be formed. A pickpocket extending in a direction that intersects a straight line 11 at a required angle with respect to the straight line 11 passing through a position separated by a required small distance from the axis 0, and blowing out the developer in a fan shape 7)
In addition to arranging a plurality of Slins S, similar Slins S for blowing out the developer are arranged on both sides of another straight line 12 which is perpendicular to the straight line 121 and separated from the center axis 0 by a required distance. While rotating the part (11 about its central axis O), a developer, that is, water, is spouted from each slit S, and the panel part (
A method is adopted in which a developing solution is sprayed onto the photosensitive agent (2) that has been applied to the inner surface of the photosensitive material (1) and exposed to the required pattern as described above, and the portions that have not been exposed and hardened are washed away. There is. However, when using such a method, there is a problem in that concentric development unevenness tends to occur as the panel (1) rotates. This uneven development, or uneven spraying of the developer, is not as much of a problem with ordinary color cathode ray tubes, but with the recent spread of high-definition color cathode ray tubes, this type of uneven development has become a problem. This is increasing the incidence of defective products. In particular, even uneven development caused by some degree of clogging of the developer outlet due to some cause, such as phosphor powder, increases the incidence of defective products.

In other words, you must always be extremely careful to avoid clogging the developer outlet, and if it does become clogged, you must remove it with great care, which reduces work efficiency. There is a problem with doing so.

[Problem that the invention seeks to solve]

As mentioned above, the present invention solves the problem of uneven development in the development process for a photosensitizer in the production of the fluorescent surface of a cathode ray tube, as well as the problem of the effects of clogging at the developer outlet. Development unevenness has been improved over
Another object of the present invention is to provide an apparatus for producing a fluorescent surface of a cathode ray tube, which reduces the influence of clogging of a developer outlet on uneven development.

[Means for solving problems]

The present invention provides an apparatus for producing a fluorescent surface of a cathode ray tube, which performs a development process by spraying a developing solution, such as water, onto a photosensitizer coated on the inner surface of a panel of a cathode ray tube body and exposed to a desired pattern. A developing nozzle with a small number of developer outlets (all of which are arranged in one direction and which performs constant reciprocating movement in two directions orthogonal to each other, for example, the direction in which the outlet is arranged and the direction orthogonal to this, or one of the two directions) The means and the panel are made to directly face the developing nozzle means, and a means for holding the panel is provided for interlocking constant speed or intermittent rotation about the axis of the panel.

The steady reciprocating motion of the nozzle means is selected to be 1 or more per revolution of the rotational motion of the panel.

[Effect]

As described above, the nozzle means in which the developer outlet is arranged is reciprocated in at least one direction, and the panel (11) is rotated while the developer is blown out to perform the development process. It has been recognized that when the nozzle means is made to reciprocate more than once during one rotation of the nozzle, it is possible to spray an almost even and uniform amount of developer over a wide area, that is, over the entire inner surface of a large screen panel. .

〔Example〕

An embodiment of the device of the present invention will be described with reference to the drawings. 1st
The figure is a side view of an example of the device of the present invention, FIG. 2 is a front view thereof,
FIG. 3 shows its top view.

The device of the present invention is a straight line L that is perpendicular to the A-A direction along a plane including the straight line A-8 having a predetermined inclination with respect to the vertical direction (direction of gravity) and the horizontal direction, and the vertical direction.
A plurality of developer solution, for example, water outlet (1
1) arrange the nozzle means (12) arranged upwardly with the required angle of elevation; (13) is, for example, a developer supply pipe having a plurality of the above-mentioned blow-off ports (11) bored in its wall surface, and this supply pipe (13) is a developer supply pipe (1).
4) through a communication pipe (15). Further, the nozzle means (12) is rotated steadily back and forth at an angle θ, for example θ=100°, about an axis L3 that is separated from the arrangement line L1 of the air outlet (11) by a required distance d, for example d-150 mm. (steady reciprocating motion), and the entire width has a required width Wv, for example WV
” 14 m5+, respectively, to make a steady reciprocating motion. Therefore, now this nozzle means (1
Looking at the trajectory for one outlet (11) in 2),
The trajectory is number 41! For example, a zigzag pattern is drawn from point P1 to P2 as shown by the thick solid line.

On the other hand, the panel holding means (11) holding the panel (11) on which a fluorescent surface is to be formed faces the nozzle means (12).
6). This panel holding means (16) holds the panel +1) on an axis A as shown in FIG. - The panel (1) is constructed so that its axis coincides with A and has the function of rotating around this axis.

In such a configuration, the panel holding means (16) is driven to rotate the panel (1) on the axis A-A while the supply pipe (13) of the nozzle means (12) and therefore the air outlet (
11) is rotated reciprocatingly at an angle θ about the straight line L3, and is constantly reciprocated along the straight line L1 with a width Wv, thereby blowing out the developer toward the inner surface of the panel (1).

In this case, the distance between the air outlet (11) and the inner surface of the panel (11) is 150 to 215III11.

In this configuration, the rotation speed (per minute) of the panel (1) is
For example, the number of air outlets (11) of the nozzle means (12) is 20, the distance between the nozzle means (12) and the panel (1) is about 187++ us, and the nozzle means (12) is 1 The moving width Wv in the direction is 14 g+s, the vertical reciprocation speed is 15 reciprocations per minute, the steady reciprocation speed (scanning speed) about the straight line L3 is 40 reciprocations per minute, and development is performed for 40 to 50 seconds.

In this configuration, by changing the relationship between the number of rotations of the panel (1) about the axis A-A and the number of steady horizontal reciprocating movements (hereinafter referred to as horizontal reciprocating scans) of the nozzle means (12), the panel (1) Figures 5 and 6 are computer simulations of the irradiation state (irradiation trajectory) of the developer on a surface corresponding to the inner surface of the substrate.

FIG. 5 shows a case where four horizontal reciprocating scans are performed in response to the rotation of the panel (1). Also, Fig. 6 shows intermittent rotation in which the panel (1) is stopped every 45° rotation, and the air outlet (11) is opened during one rotation. In the case of I8 horizontal reciprocating scanning, almost no density unevenness occurs in the wide area shown by the chain line A in any case.In contrast, in Figures 8 and 9, the number of horizontal reciprocating scans of the nozzle is , when the number of rotations of the panel is increased. In this case, density unevenness occurs completely. FIGS. 8 and 9 show cases where the panel +1) is rotated two times and four times for one horizontal reciprocating scan, respectively.

As is clear from this, compared to the number of rotations of panel (1),
When selecting the number of nozzle reciprocating scans to be 1 or more,
It can be seen that uniform developer irradiation can be obtained over a wide range.

Incidentally, in the above-mentioned example, both the horizontal reciprocating scan and the regular reciprocating movement up and down were performed, and the density unevenness in the irradiation of the developer could be satisfactorily eliminated in either case.

〔Effect of the invention〕

As described above, according to the present invention, the inner surface of the panel (1) can be uniformly irradiated with the developer, and since the uniform irradiation range is wide, it can be applied reliably even to large-screen panels. This device can be used to develop photosensitizers to create color phosphor surfaces.The color phosphor surfaces of cathode ray tubes can be reliably coated with the phosphor patterns of each color in the required pattern. As a result, a high-quality color fluorescent surface can be obtained, which is suitable for producing a color fluorescent surface in a high-definition cathode ray tube.

In addition, since the distribution of developer irradiation is uniform, even if the developer outlet (11) of the nozzle is slightly clogged, the incidence of defective products is reduced, improving yield and improving work efficiency. can be achieved.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of an example of an apparatus for producing a color fluorescent surface according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a top view thereof, and Fig. 4 shows the locus of the developer outlet. 5, 6, 8, and 9 are diagrams of developer irradiation trajectories on the panel surface, respectively, and FIG. 7 is an explanatory diagram of the conventional apparatus. (11 is the panel, (11) is the developer outlet, (12) is the nozzle means, and (16) is the panel holding means. Figure 1) Figure 2: Irradiation locus of the liquid on the V flannel surface Figure 5: Layout of conventional equipment Figure 7: One shellfish on the flannel surface ]Figure 8

Claims (1)

[Scope of Claims] An apparatus for producing a fluorescent surface of a cathode ray tube, which performs a development process by spraying a developer onto a photosensitizer that has been applied to the inner surface of a panel of a cathode ray tube body and has been exposed to a desired pattern, a developing nozzle means in which a plurality of developer outlet ports are arranged and constantly reciprocated in two or one direction perpendicular to each other; and holding means for rotating the panel at a constant speed or intermittently about the axis of the panel, and the number of reciprocations of the steady reciprocating movement of the nozzle is 1 or more for one rotation of the rotational movement of the panel. An apparatus for producing a fluorescent surface of a cathode ray tube, characterized in that it has been selected as follows.