JPS6155210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent surface manufacturing device used in the process of manufacturing the fluorescent surface of color cathode ray tubes, and in particular to a device for automatically removing unnecessary phosphor coated on the side wall of a glass panel. This relates to a device for

To explain the process of forming a phosphor film on the inner surface of a glass panel in the manufacturing process of color cathode ray tubes, first, a phosphor film and polyvinyl alcohol are coated on the inner surface of a cleaned rectangular dish-shaped transparent glass panel. A phosphor slurry made photosensitive with dichromate is injected, and the glass panel is rotated at high speed around a straight line passing through the center of the panel and perpendicular to the panel surface to form a phosphor film with a uniform thickness. Make it inside. At this time, the phosphor slurry is also applied to the side walls in the squares of the glass panel, and excess phosphor slurry is shaken off and discharged from the squares of the glass panel. Next, thoroughly dry the phosphor film using an electric heater, and then wash away the unnecessary phosphor film adhering to the square side walls of the glass panel with water.
Sweep it up with a sponge. Air is then blown onto the inner surface of the glass panel to further dry the phosphor film. Next, a shadow mask is attached and ultraviolet rays are irradiated onto the phosphor film from positions corresponding to the deflection points of each color electron beam through the holes in the shadow mask. A latent image is created, and the unexposed areas are then washed away, leaving behind the latent image portions, thereby forming phosphor dots or stripes on the inner surface of the glass panel.

In this series of steps, the apparatus conventionally used in the step of removing unnecessary phosphor films adhering to the square side walls of the glass panel is shown in FIGS. 1 and 2. Fig. 1 is a partial cross-sectional view showing the device at the stage of pouring water for cleaning. In the figure, 1 shows the cross section of a glass panel, and a phosphor slurry is applied to the inner surface of the face surface 1a and dried. A phosphor film 4 made of
A phosphor film 4b is also attached to the inner surface. To clean the unnecessary phosphor film 4b attached to the inner surface of the side wall 1b, the glass panel 1 is held by a panel carrier (not shown) having a rotation axis B inclined at about 75 degrees with respect to the vertical line A. Then, while rotating at 10 to 15 rpm, water is poured from the nozzle 2 onto the inner surface of the side wall 1b. Figure 2 shows the side wall 1 after cleaning as shown in Figure 1.
This is a partial cross-sectional view showing the step of sweeping away the phosphor and moisture remaining on the inner surface of the lens.b This sweeping is performed using a specially shaped sponge shown at 3 in the figure.

Conventionally, unnecessary removal of the phosphor film 4b has been carried out using the above-mentioned apparatus and through the above-described process, but with the method using such an apparatus, the intended inner surface of the side wall 1b cannot be sufficiently cleaned. . Also sponge 3
The sponge 3 becomes dirty quickly, requiring constant cleaning, which is a hassle, and the water contained in the sponge 3 may splash onto the phosphor film 4 on the face surface 1a, or pieces of the sponge 3 may fall. This has disadvantages, such as damaging necessary parts of the phosphor film 4.

The object of the present invention is to eliminate the above-mentioned drawbacks of conventional devices and to provide a device that can reliably clean the inner surface of the side wall 1b and is easy to handle and maintain. This invention achieves the above object by using a suction device to suction and remove moisture and residual phosphor instead of wiping it off with a sponge after pouring water.

The apparatus of the present invention will be explained in more detail below with reference to the drawings. FIG. 3 is a front view showing one embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 or 2 indicate the same parts, and after the cleaning process shown in FIG. (not shown) and is held by approximately 75 mm with respect to the vertical line A as in Fig. 2.
The device of the present invention is shown in contact with the inner surface of the side wall 1b of a glass panel 1 which rotates at a rotational speed of 10 to 15 rpm with a rotation axis B inclined at an angle of .degree. FIG. 4 shows the apparatus of the invention shown in FIG. 3 in a perspective view, and FIGS.
The figure is a side view of the apparatus shown in Figure 3 when viewed from the direction of arrow E. In the figure, 10 is made of a wear-resistant material such as resin, and both sides are formed into an approximately L-shape, with a certain thickness ( For example, about 10 mm), the surface of the side wall contact portion 11 and the surface of the seal surface contact portion 12 at the inner corner of the block 10 are The side wall contact portion 11 is in contact with the inner surface of the side wall 1b of the glass panel 1, and the sealing surface contact portion 12 is in contact with the sealing surface 1c of the glass panel 1.

This contact is made using a suitable elastic mechanism to block 1
This is done by applying forces in the directions of arrows C and D to the glass panel 1, so that contact is always maintained even when the glass panel 1 rotates.

Reference numeral 13 denotes a hole drilled into the thickness of the block 10 so as to penetrate from the vicinity of the intersection of the side wall contact portion 11 and the seal surface contact portion 12 to the surface 10a.
A pipe 14 is inserted into the side of the surface 10a, and a vacuum pipe 15 is connected to the pipe 14.

Furthermore, as mentioned above, the surface of the side wall contact portion 11 has a shape represented by a substantially straight line in the front view shown in FIG. 3, but to give a more specific example, as shown in FIG. An example of a relatively simple structure is one in which the central part of the surface has a curved surface that contacts the inner surface of the side wall 1b in a linear or band-like manner. In these cases, the direction of the contact line or band is approximately parallel to the panel axis, that is, the rotation axis B, as can be seen from the state of contact of the block 10 with the side wall 1b shown in FIG. In addition, a small gap is provided in a part of the periphery of the hole 13 so that all parts of the surface around the hole 13 in the side wall contact part 11 and the seal surface contact part 12 do not come into complete contact with the side wall 1b or the seal surface 1c. Provided for. This gap can be easily obtained by forming the side wall contact portion 11 into a curved surface as in the embodiment shown in FIG.

The operation of the apparatus of the present invention configured as above will be explained. As shown in FIG. 5, after the water has been poured onto the inner surface of the side wall 1b in the step shown in FIG. 1, a large number of water droplets 20 containing phosphor have adhered to the inner surface of the side wall 1b. glass panel 1
When the block 10 rotates, the side wall 1b moves while maintaining contact between the block 10 and the side wall 1b. As the side wall 1b moves in the direction of the arrow F as shown in FIG. 5, water droplets 20 are gathered at the contact portion of the side wall contact portion 11 of the block 10 and collected near the contact portion as shown at 21 in FIG. On the other hand, the vacuum piping 15 is connected to a vacuum pump (not shown), thereby reducing the pressure inside the pipe 14 and the hole 13. Since air flow is sucked in from the gap near the contact area, the water droplets 2
1 passes through the above gap without scattering to other parts.
3 toward the vacuum pipe 15, and as the glass panel 1 rotates, the water droplets 20 are reliably removed. As described above, since the device of the present invention utilizes the suction action, reliable cleaning can be performed without damaging the necessary phosphor film 5. In addition, since the holes 13 are provided in the wall thickness of the block 10, the side wall contact portion 11 and the side wall 1b are connected even when water droplets are absorbed from the corner of the generally rectangular side wall 1b as shown in FIG. The contact between them is maintained, and the above-mentioned gathering of the water droplets 20 and their suction are ensured. This means that glass panel 1
The effect is particularly great when the water droplets 20 are likely to gather at the corners when the roller rotates.

In the embodiments shown in FIGS. 3 and 4, the hole 13 is provided near the intersection of the side wall contact portion 11 and the seal surface contact portion 12, but this allows water droplets on the seal surface 1c to be absorbed at the same time. However, in order to reliably clean the inner surface of the side wall 1b, which is the object of the present invention, it is not necessary to use the methods shown in FIGS. 3 and 4.
It is not necessary to use the structure shown in the figure, and it is also possible to use a structure in which the opening of the hole 13 is located only on the side wall contact portion 11, as shown in the perspective view of FIG. Conversely, in order to more reliably absorb water droplets from both the inner surface of the side wall 1b and the sealing surface 1c, a plurality of holes 13 may be provided as shown in the perspective view of FIG. 8, or a plurality of holes 13 may be provided as shown in the perspective view of FIG. Various structures are conceivable, such as one in which the opening of the hole 13 is enlarged to form a hollow shape.

FIG. 10 is a front view showing an embodiment of a mechanism for pressing the block 10 into contact with the side wall 1b, and also shows a part thereof in a sectional view.
In FIG. 10, the same reference numerals as in FIG. 3 indicate the same parts, and 31 and 32 are arms rotatably connected to the block 10, and it is assumed that the arm 31 is the third arm and the arm 32 is the second arm. 3rd
The other end of arm 31 is part 3 of first arm 33.
The arm 31 is fitted into a hole provided on the side 3a so as to be freely removable and removable, and a spring 38 is provided on the arm 31. Arm 32 is rotatably connected to a portion 33a of arm 33. The first arm 33 has two portions 33a and 33b forming an obtuse angle with each other, and is supported at a fulcrum 34 by a stand 39 so as to be rotatable in a vertical plane. The arm 33 is once at rest with its portion 33b attached to the pin 35 of the tensioning device 36;
The pulling device 36 is connected to an air cylinder 37 fixed to a stand 39.

To explain the operation of the device having such a configuration, initially the pin 35 is lowered by the air cylinder 37 and the device is in the position shown by the two-dot chain line. When suctioning water droplets, the air cylinder 37 raises the pin 35, and the block 10 is lowered by gravity and brought into contact with the side wall 1b of the glass panel 1, which is supported by the chuck 30 and is rotating. This contact is caused by gravity and the spring 3 pushing the arm 31 forward.
It is maintained by the elastic force of 8. Furthermore, block 10
The sled portion 16 is provided to ensure smooth operation when the block 10 descends and starts contact.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and many different designs are possible without departing from the spirit thereof. For example, although the block 10 is constructed from a single thick member, this is not necessarily necessary and it may be constructed by combining a plurality of relatively thin plates.
Further, the hole 13 may be hollow-shaped and surrounded by a combination of thin plates. It goes without saying that the device for pressing the block 10 against the glass panel 1 may be other than the example shown in FIG. In the above explanation, this invention has been explained as a fluorescent surface manufacturing apparatus for color cathode ray tubes, but the apparatus of this invention can also be applied to cathode ray tubes other than color cathode ray tubes to form a coating film other than phosphor on the inner surface of a glass panel. Needless to say, it can also be used for

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing an apparatus in the process of cleaning the side wall of a glass panel, and FIG. 2 is a device for removing moisture and residual phosphor from the side wall of the glass panel after the previous process shown in FIG. 1 is completed. FIG. 3 is a front view showing essential parts of an embodiment of the present invention; FIG. 4 is a perspective view of the device shown in FIG. 3; FIGS. 5 and 6. is a side view of the device shown in FIG. 3, FIG. 7 is a perspective view showing another embodiment of the invention, FIG. 8 is a perspective view showing still another embodiment of the invention, and FIG. 9 is a perspective view showing another embodiment of the invention. FIG. 10 is a front view showing an embodiment of the entire apparatus of the present invention, which is equipped with a device for pressing the portion shown in FIG. 3 against the side wall of the glass panel. . In the figure, 1 is a glass panel, 1a is a face surface of glass panel 1, 1b is a side wall of glass panel 1, 1c is a sealing surface of glass panel 1, 2 is a nozzle, 3 is a sponge, 4 is a phosphor film, and 4b is a Unnecessary phosphor film, 10 is block, 11 is block 10
12 is a seal surface contact portion of the block 10, 13 is a hole, 14 is a pipe, 15 is a vacuum pipe, 16 is a warped portion, 30 is a chuck, 31,3
2 and 33 are respective arms, 34 is a fulcrum, 35 is a pin, 36 is a pulling device, 37 is an air cylinder, 38 is a spring, and 39 is a stand. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A side wall contact portion that contacts the inner surface of the side wall of the cathode ray tube glass panel, a seal surface contact portion that contacts the seal surface of the glass panel, and a suction nozzle that is connected to a vacuum pump via vacuum piping. A fluorescent surface manufacturing apparatus for a cathode ray tube, comprising a suction device and a device for bringing the suction device into contact with the inner surface of the side wall and the sealing surface of the glass panel by gravity and/or elastic pressing force. 2. Claims characterized in that the side wall contact portion and the panel surface contact portion of the suction device are constituted by one member, and the suction nozzle is provided with a hole or a cavity in the one member. 2. The apparatus for producing a fluorescent surface for a cathode ray tube according to item 1. 3. The fluorescent surface manufacturing apparatus for a cathode ray tube according to claim 1 or 2, wherein the opening of the suction nozzle is provided in the side wall contact portion. 4. The cathode ray tube fluorescent surface manufacturing apparatus according to claim 1 or 2, characterized in that the opening of the suction nozzle is provided across both the side wall contact portion and the seal surface contact portion. . 5. The cathode ray tube fluorescent surface manufacturing apparatus according to claim 1 or 2, wherein the suction nozzle has separate openings in both the side wall contact portion and the seal surface contact portion. 6. The contact between the side wall of the glass panel and the side wall contact portion of the suction device is a line contact or a strip contact, and the direction in which the contact line or strip extends is approximately parallel to the axial direction of the glass panel. An apparatus for producing a fluorescent surface of a cathode ray tube according to claim 1. 7 The device for pressing the suction device into contact with the glass panel includes a first arm rotatably supported on a table in a vertical plane, a pulling device coupled to one end of this first arm to raise and lower it, and the above-mentioned device. A power device is fixed to the stand and drives the pulling device, and a second arm has one end rotatably connected to the lower part of the other end of the first arm and the other end rotatably connected to the lower part of the suction device. an arm, one end of which is coupled in a telescopic relationship to the upper portion of the other end of the first arm, the other end of which is rotatably coupled to the upper portion of the suction device, and between the other end and the other end of the first arm; 2. A fluorescent surface manufacturing apparatus for a cathode ray tube according to claim 1, further comprising a third arm provided with a spring.