JPH0378932A - Panel pin cleaning method for color picture tube and its cleaning device - Google Patents

Abstract

PURPOSE:To easily remove praphite solution attached to the surface of a panel pin by stopping at a fixed position with a panel inside face directed just downward to pour water solution thereon through a nozzle which is installed corresponding to the panel pin. CONSTITUTION:When a graphite coated panel 2, held by a carrier 1, is rotationally moved to a panel pin cleaning position and starts rotation with being directed just downward, a movable base 4 is elevated by an air cylinder 3 and stopped when a positioning roller 5 has contact with the seal face 6 of the panel 2. When an extension shaft 11 is rotationally moved by an air cylinder 10, it causes a lever 12 joined thereto to push out a nozzle cap 13 along a guide rail 14 and is stopped in contact with a side wall around the panel pin 15. Followingly, water solution led from the tip of a nozzle 16 via a hose 17 is poured to clean the panel pin 15. It is thus possible to remove graphite solution attached to the surface of the panel pin in an easy method.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a color picture tube panel pin cleaning method for removing graphite liquid adhering to the panel pins in the black matrix creation process of color picture tubes, and the method thereof. This invention relates to a cleaning device.

[Conventional technology]

Normally, the phosphor screen of a color picture tube is made of a graphite film and a light-absorbing film that improves the contrast of the image.
It consists of a phosphor layer that emits light of a different color, and an extremely thin aluminum reflective film provided on the phosphor layer.

In forming the first layer of graphite film, after forming resist stripes or resist dots on the inner surface of the first panel, a shadow mask installed on the side wall of the panel is used to spray the graphite liquid over the entire inner surface of the panel. Graphite also adheres to and remains on the surface of panel pins. Since the spring of the shadow mask is fitted to this panel pin, the graphite adhering to the surface of the panel pin is scraped off and becomes conductive dust inside the picture tube, which can cause sparking inside the tube or clogging of the shadow mask. It will cause the cause.

Therefore, conventional methods for removing graphite from panel pins include mechanically cleaning the surface of the panel pin by rubbing it with a rotating brush, or Japanese Patent Application Laid-open No. 62-21943.
As disclosed in Publication No. 6, a method such as pressing a sponge roller against a panel pin and wiping off the adhering coating liquid is used, but Moe's method causes the brush to wear out and maintenance of the device is troublesome. In addition, if the graphite solids etc. blown away by the brush hit the screen part, there are problems such as creating defects on the black matrix surface, and the latter method causes the sponge roller to deteriorate quickly.
Problems in operation are likely to occur due to replacement or because the device is complicated, and furthermore, there are disadvantages such as liquid splashing from the roller to the screen during the pressure contact process of the sponge roller.

[Problem to be solved by the invention]

Conventional panel pin cleaning devices are constructed in such a way that a cleaning member such as a rotating brush or sponge roller comes into contact with the panel pins, which requires work to replace them as they wear out. Since the method involves applying force or contact, liquid splashes and dust splashes are likely to occur.
There were many problems.

The present invention has been made to solve the above problems, and includes a method and method for cleaning panel pins of color picture tubes that can remove graphite liquid adhering to the surface of panel pins in a simple manner and minimize maintenance work for the device. The purpose of the present invention is to provide such a cleaning device.

[Means to solve the problem]

The method for cleaning panel pins of a color picture tube according to the present invention includes:
Apply graphite liquid, shake off the excess liquid,
After slightly heating the inside of the screen, the panel was stopped in a fixed position with the inner surface facing straight down, and an aqueous solution was poured through a nozzle provided corresponding to the panel pin to wash away the graphite liquid adhering to the pin. It is something.

[Effect]

The method for cleaning panel pins in this invention is to remove a large amount of graphite liquid that accumulates on the peripheral edge of the panel pin due to surface tension after applying graphite by pouring an aqueous solution on it while the graphite liquid is still wet. There is no residue left behind, and there are no structural members that wear out or deteriorate, so maintainability is excellent.

〔Example〕

FIG. 1 is a flowchart of steps applied to a method for cleaning panel pins of a color picture tube according to the present invention. First, a graphite liquid is spray applied to the entire surface of the resist film, including the pixel pattern surface, which is formed on the inner surface of the panel in the area that will become the screen.

Next, the rotation speed of this panel is increased and excess graphite liquid is discharged from the inner surface of the panel by centrifugal force. Thereafter, the rotational speed is lowered to about 3 Orpm, and the infrared heater is used to gradually heat the film to suppress the fluidity of the graphite film within the screen. At this point, the amount of graphite liquid remaining on the surface of the panel pin is extremely large compared to the inside of the screen, so it has not yet dried and is still in a wet state. Subsequently, by pouring an aqueous solution of about 5 to 10 degrees downward onto the plurality of panel pins on the inner surface of the panel, the graphite liquid is washed away. After this, completely dry the panel inner surface and panel pins using an infrared heater.

As a result, the amount of graphite remaining attached to the panel pin is extremely small, and no graphite dust is generated when the mask spring is attached or detached.

FIG. 2 is a configuration diagram showing an embodiment of the panel pin cleaning device according to the present invention.

In the figure, a panel (2) held in a carrier (1)
rotates to the panel pin cleaning position and turns the graphite-coated spring A/f2) directly downward at 10 rpm.
When the rotation begins, the air cylinder (3) raises the movable base (4), and the positioning roller (5) moves the panel (
It stops when it comes into contact with the sealing surface (6) of 2). After this, when the air cylinder (force is activated and the carrier positioning arm (8) descends, the rotating carrier (1)
)'s positioning pin (9) hits this arm (8) and stops rotation. Next, when the air cylinder (10) extends and rotates the shaft (11), the lever (12) connected to this moves the nozzle cap (13) to the guide tray 1v.
Extrude along (14), around panel pin (15) +
7) It stops when it comes into contact with the side wall. Next, Nozzle Chara 7'
A nozzle (16
) from the tip of the hose (17) to 5 to 1
0d is drained to clean the pin 4/L/pin (15).

An electromagnetic pulp (not shown) is connected to the hose (17) that supplies the aqueous solution, and when it is closed after cleaning for about 6 seconds, the above-mentioned mechanisms operate in reverse order, and the movable base (4) detaches from panel (2) and descends to return to the reference position. This completes one cycle of the pin cleaning process, and the carrier (1) rotates again to move to the next drying position using an infrared heater.

2! Fig. IIB is a partially enlarged view for explaining the mutual relationship between the nozzle cap (13) and the panel pin (15) in the panel pin cleaning device shown in Fig. 2, and the structure of the nozzle cap (13) is as follows: A recess (13a) deeper than the height of the panel pin (15) from the side wall of the panel (2)
The recess (13a) is further provided with a nozzle/L/(16) for discharging the aqueous solution. That is, when this nozzle cap (13) moves forward and comes into pressure contact with the panel side wall, the panel pin (13) moves forward as shown by the two-dot chain line.
5) so as to make contact with the U-shape (2a) surrounding it. Therefore, the space for cleaning the panel pin (15) is separated from the screen side of the panel (2), so the aqueous solution that is poured hits the panel pin (15) and scatters, which may cause defects on the screen. Trouble can be avoided.

〔Effect of the invention〕

As described above, according to the present invention, after coating the graphite liquid, the nozzle cap is used to clean and remove the graphite liquid while the panel pin is not dry.
Since the aqueous solution is discharged surrounding the pin, there is no problem of wear or deterioration of the device parts, and the cleaning effect is good and the withstand voltage performance can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a flowchart of the steps applied to the panel pin cleaning method for a color picture tube according to the present invention, FIG. 2 is a block diagram of the panel pin cleaning device of the present invention, and FIG. 3 is a nozzle in the panel pin cleaning device of FIG. 2. It is an explanatory view of mutual relationship between a cap and a panel pin. 11>---Carrier, +2)---Panel, 14)-
- one movable pace, +5) - one roller, (6) shaft - panel sealing surface, (8) - one carrier positioning arm, (13) - nozzle cap, (15) - panel pin, ( 16) --- Nozzle, (17) --- Hose. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A pixel pattern of a resist film is provided on the inner surface of a face panel for a color picture tube, and while the inner surface of the panel is rotated diagonally downward, a plurality of wide-angle sprays are provided facing the center of the panel. Spray the graphite dispersion liquid from the nozzle, then increase the rotation speed of the panel and use centrifugal force to shake off the excess graphite liquid coated on the inner surface of the panel, then heat it with an infrared heater for 10 to 40 seconds, and then After this, the carrier holding the panel is fixed in a fixed position facing straight down, and an aqueous solution is poured from a nozzle close to the panel pin onto the surface of the panel pin that is wet with graphite liquid to clean the graphite liquid attached to the pin. A color picture tube panel pin cleaning method that removes the pins and then dries the entire inner surface of the panel using an infrared heater. (2) A roller that contacts the panel seal surface to determine the height, a carrier positioning arm that determines the direction of the panel pin, and a carrier positioning arm that moves in the direction of multiple panel pins from the center of the panel and surrounds the pins. A nozzle cap that presses against the side wall of the panel and can move forward and backward, a nozzle provided through the nozzle cap, a mechanism that raises and lowers a movable base that holds the above mechanism, and a fixed base mechanism that supports these. A color picture tube panel pin cleaning device featuring: