JPH04129127A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To dispose drainage from a panel as preventing splashing in the periphery by exhausting liquid, which is pooled in a corner part by declining one corner part of a panel downward after the desired liquid is spread out in the panel, via a suction nozzle. CONSTITUTION:Panel 1 being held by a panel clamp mechanism is made so as its inner face to turn upward and desired liquid 3 is poured in the panel 1 via a pouring nozzle 11. Next the panel 1 is autorotated so as the liquid 3 to be spread uniformly all over the surface in the panel. Next the panel 1 is declined for instance by about theta=10 deg.-15 deg. so as its one corner part 1a to turn downward. The liquid 3 being pooled in this corner part 1a is exhausted toward outside via a suction nozzle 12. As drainage through this nozzle 12, all of the liquid 3 in the panel 1 is not exhausted but one part is left. That is the liquid 3 is exhausted so as its left amount to become as less as possible. Next the left small amount of liquid 3 is exhausted as a natural fall by revolution of the panel 1, and disposal of the drainage is completed. Thereby it is possible to prevent the liquid 3 from splashing in the periphery and avoid bad effect to peripheral instruments. When the liquid is reused after recovery, it is possible to utilize usual splashed amount effectively and reduce waste of the liquid.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a cathode ray tube, particularly in a phosphor screen manufacturing process, after injecting a desired liquid into the panel and distributing it over the entire surface.
This invention relates to a treatment method for draining excess liquid from a panel.

[Summary of the invention]

In a method for manufacturing a cathode ray tube, the present invention involves injecting a liquid into a panel, rotating the panel to spread the liquid over the entire surface, and then tilting one corner of the panel downward to remove the liquid that accumulates in the corner. By discharging the liquid through the suction nozzle, it is possible to prevent the liquid from scattering especially when the liquid is drained, and to avoid adverse effects on peripheral equipment.

[Conventional technology]

When creating a phosphor screen for a color cathode ray tube, a desired liquid such as PVAg light liquid, carbon slurry, phosphor slurry of each color, or warm water is injected into the panel according to each process, and after distributing it over the entire surface, the excess is removed. The process involves draining the liquid. Conventionally, as shown in Fig. 6, the panel (1)
With the inner surface facing upward, inject the desired liquid (3) into the inner surface of the panel (1) through the injection nozzle (2) (A), then rotate the panel (1) and pour the liquid (3) over the entire surface of the panel. ) is evenly distributed (B in the same figure), the panel (1) is rotated and the excess liquid (3) in the panel (1) is drained by gravity (C in the same figure) .

[Problem to be solved by the invention]

However, as mentioned above, the conventional method of injecting the desired liquid (3) into the panel (1) and then simply rotating the panel (1) and draining the liquid by gravity does not allow the liquid (3) to flow around the liquid (3). There was an inconvenience that the scattering was severe and had an adverse effect on peripheral equipment.

In view of the above-mentioned points, the present invention provides a method for manufacturing a cathode ray tube that makes it possible to treat liquid drained from the panel while particularly preventing the liquid from scattering to the surrounding area.

[Means to solve the problem]

The present invention involves injecting a liquid (3) into a panel (1), rotating the panel (1) to spread the liquid (3) over the entire surface, and turning one corner (1a) of the panel (1) downward. The suction nozzle (12)
Allow it to drain through.

[Effect]

In the method of the present invention, a desired liquid (3) is placed in the panel (1).
), then tilt one corner of the panel (1) downward to remove the liquid (3) that collects in the corner (1a).
) through the suction nozzle (12),
This prevents liquid from splashing onto peripheral equipment when draining.

In addition, if all the liquid (3) accumulated inside the panel (1) is sucked up by the suction nozzle (12), it will affect the film thickness when forming a uniform film (4) of the liquid (3) on the inner surface of the panel. However, in this example, the suction nozzle (12) is used to suck up the remaining amount as much as possible, and with a small amount of liquid (3) remaining, the panel (1) is rotated to remove the small amount of liquid (3).
3) is discharged, it is possible to prevent it from scattering to the surrounding area, and at the same time, the coating film (4) formed on the inner surface of the panel can be discharged.
Does not affect the film thickness. Furthermore, since the liquid is prevented from scattering, the liquid (3) is not wasted when the liquid (3) is collected and reused.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, to make this example easier to understand. An example of a process for creating a color phosphor screen for a color cathode ray tube will be described. A PVP (polyvinylpyrrolidone) photosensitive solution is injected into the inner surface of the cathode ray tube panel to form a PVP photosensitive film with a uniform thickness. After drying, the color selection electrode is used as an optical mask to expose the film, and the color is developed by washing with water to create each color. A striped resist layer is formed at positions corresponding to . Next, carbon slurry is injected over the entire surface including the resist layer to form a uniform carbon film.
After drying, a reversal agent such as hydrogen peroxide is injected and reversal development is performed (that is, the resist layer and the carbon layer thereon are lifted off) to form a predetermined pattern of carbon stripes, ie, black stripes. Next, PV inside the panel
A (polyvinyl alcohol) g light liquid is injected to form a PVA photoresist film with a uniform thickness, and after drying, exposure corresponding to two colors, for example red and blue, is performed using the color selection electrode as an optical mask, followed by washing with water, etc. A resist layer is formed in the areas corresponding to the two colors red and blue. Then, a green phosphor slurry is applied, and after drying, external exposure is performed from the front of the panel. Next, a reversal agent such as hydrogen peroxide is injected and reversal development is performed (that is, the resist layer and the phosphor slurry thereon are lifted off) to form green phosphor stripes at positions between predetermined carbon stripes. Thereafter, red phosphor stripes and blue phosphor stripes are formed at positions between respective predetermined carbon stripes in the same manner (external exposure, reverse development, etc.). Next, after hot water is injected to raise the temperature of the panel, an interlayer film (primal) is formed, and then an M metal back is formed to form the desired color phosphor screen.

Therefore, in this example, P in the phosphor screen forming process is
This is a case where it is applied to the injection of liquids such as VA photosensitive liquid, reversal agent, and hot water, and the discharge of such liquids from the panel.

That is, in this example, as shown in Fig. 1, the panel [1] held by the panel clamp mechanism is held with its inner surface facing upward, and a desired liquid (according to the process) is poured into the panel (1). (PVA photosensitive liquid, reversal agent, warm water, etc.) (3) is injected through the injection nozzle (11) (A in the same figure). Next, the panel (1) is rotated so that the liquid (3) is evenly distributed over the entire surface of the panel (FIG. B).

Next, one corner (Ia) of the panel (1) is tilted at an angle of θ=10° to 15°, for example, so that one corner (Ia) faces downward, and the liquid (3) accumulated at this corner R (la) is removed using a suction nozzle ( 12) to the outside. This suction nozzle (1
Drainage through 2) drains all the liquid in panel (1) (3).
) rather than discharging it, some of it remains. In other words, the liquid (3) is drained so that the remaining amount of liquid (3) is as small as possible (C in the same figure).

Next, the panel (1) is rotated and the remaining small amount of liquid (3
) is discharged by gravity, completing the drainage treatment (D in the same figure)
.

According to the final method, when a desired liquid (3) is injected into the panel (1) and then the excess liquid (3) in the panel [1] is discharged, the remaining amount is minimized by the suction nozzle (12). By draining the liquid until the panel (1) is rotated and draining the small amount of liquid (3) that remains inside the panel due to natural fall, the liquid is prevented from scattering to the surrounding area as in the conventional method. , adverse effects on peripheral devices are avoided.

Furthermore, when draining liquid using the suction nozzle (12), the panel (1) is placed so that one corner (1a) faces downward, and the suction nozzle (12) is inserted into the corner (1a) to suck the liquid. , most of the liquid can be drained leaving only a small amount. By leaving a small amount of the liquid (3) inside the panel (1) by draining the liquid using the suction nozzle (12), the thickness of the coating film (4), for example, when forming a PVA photoresist film using the liquid (3), can be increased. In other words, it is possible to form a PVA photoresist film having a uniform thickness without affecting the PVA photoresist film. Furthermore, when the liquid (3) is collected and reused, scattering is avoided, so less liquid [3] is wasted.

Next, an apparatus for performing liquid injection and liquid recovery (drainage) processing according to this embodiment will be explained using FIGS. 2 and 3.

wooden! t(10) has a first arm (13) with an injection nozzle (11) attached to its tip and a second arm (14) with a suction nozzle (12) similarly attached to its tip,
A robot (15) in which each arm (13) and (14) can selectively rotate in a direction along a vertical plane, and a collection hood (16) installed close to the robot (15).
).

Each arm (13) and (14) of the robot (15) is
It is L-shaped when viewed from above, and each end is a support (17〉
The injection nozzle (11) and the suction nozzle (12) are respectively attached to the other end of the nozzle, and the injection nozzle (11) and the suction nozzle (12) are attached to the other end of the nozzle. Each nozzle (11)
and (12) are X in the plane including the L-shaped arm so that the setting position can be adjusted according to panels with different types of pipes.
Position setting hand GH (
arms (13) and (14) via arms (19) and (20);
). Cylinders (21) and (22) for rotating the arms (13) and (14) are connected to each arm (13) and (14). Here, each arm (13) and (14) is placed at a position inclined at 15 degrees with respect to the horizontal (solid line position) and at a position inclined at 30 degrees (dashed line position), as shown in FIG.
Rotate between two positions. The 151 tilted position is used when the nozzles (11) and (12) enter the panel (1) to inject the desired liquid (3) and suck this liquid, and the 30° tilted position ) The nozzles (11) and (12) are separated from each other and stand by. A sleeve hose (not shown) for supplying a desired liquid (3) is connected to the injection nozzle (11). Similarly, a hose for suctioning and discharging the desired liquid (3) is connected to the suction nozzle (12), and a bellows pump is used as the suction pump. In addition, a suction nozzle (
12) is formed by inserting the nozzle body (26) into the hollow head part (25) that communicates with the hose (24) as shown in Figure 4, but in order to prevent the sucked liquid (3) from flowing back, The inner end of the nozzle body (26) is formed to protrude inward from the inner bottom surface of the hollow head (25) by a predetermined distance d (for example, about 1 Q mm).

On the other hand, the recovery hood (16) has a cylindrical body with a narrowed rear end, and has a guide rail (29) on the pedestal (28).
It is arranged so that it can move forward and backward at an inclination of, for example, 15 degrees. At the retracted position of the recovery hood (16) (Fig. 3 thin line position (16,)), the nozzle (11), <12)
The thin line in Figure 3 (1) is far enough away from the forward position.
In 6□)), the revolving panel [1] is the collection hood (16
). This recovery hood (16)
A hose (30) for collecting the liquid (3) and discharging it to the outside is attached to the. In addition, (32) is a weight, (23) and (34) are arms (13), (
14) This is a bar for determining the 15° inclined position and the 30° inclined position.

Although not shown, the panel (1) is held by a lamp head that is rotatable and revolving, and is provided at the tip of an arm that rotates in a horizontal plane of the panel clamp device. A panel clamp device has a plurality of arms arranged radially around a rotating main shaft, and a clamp head is attached to the tip of each arm.
1) It is configured to be a mechanism for holding the four sides in a pinching manner so that it can be used commonly for different types of panels. This device (10) is installed at a predetermined position around this panel clamp device Z,
.

In this device (10), when injecting the desired liquid (3) into the inner surface of the panel (1), the arm (14) of the suction nozzle (12) waits at a position inclined by 30 degrees by the cylinder (22), and The collection hood (16) is also waiting in the retracted position (16,). and injection nozzle (
The arm (13) of 11) is 1 by the cylinder (21).
It is brought to a 5° inclined position and a desired liquid (3) is injected into the panel [1] from the injection nozzle (11). After injection, the arm (14) of the injection nozzle (11) is rotated to a 30° inclined position and is on standby, during which time the panel [1] rotates and the liquid (3) is evenly distributed over the entire surface of the panel.

Next, the panel (1) is rotated to a position where it is tilted 15 degrees with one corner (1a) facing downward, and then the suction nozzle (
The arm (14) of 12) is rotated to a 15° inclined position, and the suction nozzle (12) is just inserted into its corner portion (1a) (see FIG. 5). Next, the liquid (3) accumulated in the corner portion (1a) is discharged 8 through the suction nozzle (12). The swelling and drainage is stopped with a small amount of liquid (3) remaining in the panel (1), and the arm (14) is returned to the 30° inclined position.

Next, the recovery hood (16) is advanced to the fixed position (162), and in synchronization with this, the panel (1) revolves and the panel (
1) enters the collection hood (16), the liquid (3) slightly remaining in the panel [1] falls naturally and falls into the collection hood (16).
16) is discharged inside. When the recovery of the liquid [3] is completed, the recovery hood (16) returns to its original position (16□).

According to this device (10), the liquid (
3) Injection and drainage can be performed at the same location. In the liquid drainage process, first, the amount of liquid (3) remaining in the panel (1) is reduced as much as possible using the suction nozzle (12), and then the remaining liquid is drained by rotating the panel (11). Since the panel (1) is inserted into the recovery hood (16), the amount of liquid discharged due to gravity is small, and the liquid is discharged inside the recovery hood (16), which together reduces the amount of liquid released into the surrounding area. Scattering can be reliably prevented. Also, the liquid can be reused without wasting it.

In addition, this device (10) also has arms (13) and (14).
) The position of each nozzle (11) and (12) can be adjusted by adjusting the position setting means (19) and (20) at the tips of the nozzles (11) and (12). be able to.

〔Effect of the invention〕

According to the present invention, in the step of creating a phosphor screen of a cathode ray tube,
After injecting the desired liquid into the panel and distributing it uniformly over the entire surface, when draining the excess liquid inside the panel, it is possible to prevent the liquid from scattering to the surrounding area, thereby preventing damage to surrounding equipment. Negative effects can be avoided. In addition, when collecting and reusing the liquid, it is possible to effectively use only the amount that is scattered, which can reduce waste of liquid3.

[Brief explanation of drawings]

1st TsJA-D is a process diagram showing an example of the method of the present invention,
Figures 2 and 3 are a perspective view and a side view of the device according to the present invention, Figure 4 is a sectional view showing an example of a suction nozzle, Figure 5 is a perspective view of the suction state, and Figures 6A-C are FIG. 2 is a process diagram showing a conventional liquid drainage method. (1) is the panel, (support)] is the injection nozzle, (3) is the liquid,
(11) is an injection nozzle, (12) is a suction nozzle, (16)
) is a collection hood. Agent Hidemori Matsukuma Hontsuyakusa° [Process diagram Figure 1 Figure 4! 2 Motion Luxury and Relaxation February a] Figure 5 Figure 6

Claims (1)

[Claims] Injecting a liquid into the panel, rotating the panel on its own axis to spread the liquid over the entire surface, and tilting one corner of the panel downward to suck out the liquid that accumulates in the corner. A method for manufacturing a cathode ray tube, characterized in that the cathode ray tube is discharged through a nozzle.