JPH09262525A - Apparatus for film coating and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the amt. of spraying const. and to make uniform coating possible by a method wherein a sub-storage means for a coating liq. is arranged above a spray means and the coating liq. is fed to the spray means from a main storage means for the coating liq. through the sub-storage means for the coating liq. in an apparatus wherein film coating is performed by scanning the spray means. SOLUTION: In this film coating apparatus for applying an anti-reflective film 2 on the surface of a face panel 3 of a CRT 1, a sub-storage means for a coating liq. 18 (a sub-tank) is fixed above the vertical part of a supporting part 14 for a spray gun with a screw 19, etc. In addition, a main storage means for the coating liq. 8 (a main tank) filled with the coating liq. for an anti- reflective film 2 is arranged on the reference floor to make it possible to feed the coating liq. 11 into the sub-tank 18 through a coating liq. feeding pipe 16 and a pump 7. In addition, a spray means 6 contg. the spray gun 4 and the sub-tank 18 is held by means of a robot through a robot hand part 5 and the anti-reflective film 2 is formed on the face panel 3 by scanning it in the X and Y axial directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a film coating apparatus and a film coating method for coating an antireflection film or an antistatic film formed on a face panel surface of a cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube (hereinafter referred to as CRT).
CRT with anti-reflection, anti-glare, and anti-reflection film with light absorption properties applied by spraying etc.
Is widely used.

Such an antireflection film 2 is made of C as shown in FIG.
First layer on the face panel 3 of RT1 with a spray gun etc.
Tin oxide (SnO_Two) 12, silicon oxide (S
iO _Two) 13 sequentially in 2 or 4 layers with 0.2 to 0.4 μ
to form the antireflection film 2 by coating to a thickness of about m
It has been made to.

Such an antireflection film 2 is applied by a film application device as shown in FIGS. 7 and 8. FIG. 7 is a schematic explanatory view for explaining a conventional coating method of an antireflection film, and FIG. 8 is a perspective view of a nozzle portion. In FIGS. 7 and 8, three spray guns 4 are arranged side by side on a horizontal portion of a spray gun supporting portion 14 formed in an inverted T shape, and a robot hand portion 5 is mounted on an upper portion of a vertical portion. ing.

The robot hand portion 5 is held by, for example, a 6-axis robot (not shown), and the spray means 6 including the spray gun 4 and the spray gun support portion 14 is arranged along the X axis of the face panel 3 of the CRT 1 which is the object to be coated. Scanning is performed as shown in FIG. That is, the scanning locus 15 is moved in the Y-axis direction at a position where the left and right side edges 3L and 3R of the face panel 3 are exceeded, and X is arranged at a pitch such that the antireflection film 2 is uniformly applied onto the face panel 3 surface. Scanning is performed so that scanning lines are alternately reflected in the axial direction.

The main tank 8 filled with the coating liquid 11 is arranged on the floor, and the coating liquid 11 is supplied to the spray gun 4 from the main tank 8 via a pump 7 arranged between the coating liquid supply pipes 16. . The air source 9 is also arranged on the floor, and spray air is supplied from the air source 9 to the spray gun 4 through the air pipe 17. Incidentally, 10 is an air pressure gauge. The air pipe 17 and the coating liquid supply pipe 16 are made flexible, and the spray means 6 is easily movable in the X and Y axis directions.

[0007]

In the conventional film coating apparatus and film coating method as described above, when the scanning direction of the raster of the CRT 1 is the X axis and the direction orthogonal to the raster is the Y axis,
For example, assuming that the height dimension of the CRT 1 in the Y-axis direction is H ₃ , the amount by which the center of the nozzle of the spray gun 4 moves in the Y-axis direction in FIG. 7 is considered based on the height of the liquid level of the main tank 8 in FIG. Then, we have to move H ₃ = H ₂ −H ₁ . Also, in the X-axis direction, as described in the scanning, the CRT
It must be moved by an amount greater than the X-axis dimension of 1.

Recently, CRTs have been improved in definition, and for TV sets, MUSE (Multiple-Nyqus).
It is horizontally long and has a large size corresponding to ist Sampling Encode). For this reason, the movement range of the spray gun 4 is increased, and the coating area is greatly increased.

Due to such a cause, the height difference H ₂ -H ₁ between the main tank 8 for storing the coating liquid 11 and the center of the nozzle of the spray gun causes the discharge amount of the coating liquid 11 from the pump 7 and the spray gun 4. The discharge amount from the nozzle fluctuates and CR
There was a problem that a uniform reflection film could not be applied to the face panel 3 surface of T1.

The present invention is intended to provide a film coating apparatus and a film coating method which solve the above problems, and the problem is that the height difference between the spray gun and the coating liquid supply source is always constant. A sub-tank that moves together with the spray gun is arranged so that the coating liquid is supplied to the spray gun through the sub-tank, and a uniform antireflection film is applied to the face panel surface of the CRT 1. It is a thing.

[0011]

As shown in FIG. 1, the film coating apparatus of the present invention scans the spray means 6 facing the surface 3 to be coated in the primary and secondary surface directions. In the film coating apparatus configured to coat the film 2 on the surface 3 to be coated, the spraying means 6 and the sub-coating liquid storage means 18 to be scanned are disposed above the spraying means 6. The coating solution 11 is supplied from the main coating solution storage means 8 to the spray means 6 via the sub-coating solution storage means 18.

According to the film coating apparatus and the film coating method of the present invention, the distance between the center position of the nozzle of the spray gun and the sub-tank 18 which is the sub-coating liquid storage means is kept constant, so that the constant coating liquid 11 is supplied from the sub-tank 18. Is discharged and a uniform coating film can be easily obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case in which an antireflection film 2 is applied to the surface of a face panel 3 of a CRT 1 as a film applying apparatus and a film applying method of the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a schematic view of a main part of the film coating apparatus of the present invention,
Shows a similar perspective view, and the portions corresponding to those in FIG. 6 to FIG.

In FIG. 1 and FIG. 2, there are, for example, three spray guns 4 facing the face panel 3 of the CRT 1 on the surface of the object to be coated.
Is disposed in the horizontal portion of the substantially T-shaped spray gun support portion 14. A sub-coating liquid storage means (hereinafter referred to as a sub tank) 18 is fixed to the upper portion of the vertical portion of the spray gun support portion 14 with a screw 19 or the like. There are also two vertical grooves 2 in the vertical part.
2 is formed so that the mounting position in the vertical portion of the sub tank 18 can be adjusted. A robot hand portion 5 is attached to the side of the vertical portion opposite to the sub-tank attachment surface.

On the standard floor, the coating liquid 1 for the antireflection film 2
A main coating liquid storage means (hereinafter referred to as a main tank) 8 filled with 1 is provided, and the sub tank 1 is provided from the upper cover side of the sub tank 18 via a coating liquid supply pipe 16 and a pump 7.
The coating liquid 11 is supplied to the inside of the container 8. The capacity of the sub tank 18 is, for example, width × length × height 80 mm × 80 mm × 120 mm
The coating liquid 11 is filled to a height of about 100 mm. Reference numeral 20 denotes a return pipe for returning the coating liquid 11 overflowing from the sub tank 18 to the main tank 8, which is taken out from the upper side wall of the sub tank 18.

A nozzle liquid supply pipe 21 for supplying the coating liquid 11 to each of the spray guns 4, 4, 4 is led out from the side surface of the sub tank 18 and connected to each spray gun.

Air is supplied to the spray guns 4, 4 and 4 from an air source 9 through an air pressure gauge 10 and an air pipe 17 and mixed with a coating liquid 11 to be sprayed from the nozzle tips of the spray guns 4, 4 and 4. Spray the coating solution.

A spray means 6 including a sub-tank 18 which is vertically slidably attached to the vertical portions of the spray guns 4, 4, 4 and the spray gun support portion 14 has a robot hand portion 5 as a robot (not shown). Face panel 3 of the CRT 1 by gripping with and scanning in the X and Y axis directions as indicated by the arrows.
An antireflection film 2 is formed on top.

According to the above-mentioned configuration, the CRT 1 in which the same scanning as that described in FIG. 8 of the conventional example is enlarged or laterally elongated.
Even if it is performed along the face panel 3 of the above, the distance between the center of the nozzles of the spray guns 4, 4 and 4 and the liquid surface of the sub tank 18 is kept constant, so that the main tank 8 of the coating liquid 11 and the nozzles of the spray gun 4 are maintained. A constant discharge amount can be obtained regardless of the height difference, and a uniform coating film can be easily formed. The control method of the discharge amount is as follows.
It is possible to change the position by sliding along 2 and screwing with the screw 19. Further, in the remote control, the discharge amount can be easily changed by changing the air pressure of the spray guns 4, 4, 4.

Another structure of the film coating apparatus of the present invention will be described with reference to FIGS. FIG. 3 is an assembled perspective view showing another configuration of the sub tank 18 used in the film coating apparatus of this example. Parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals, and redundant description will be omitted. In FIG. 3, the cover portion 25 of the sub-tank 18 is formed in a pyramid shape, and the nozzle liquid supply pipes 21 and 21 are provided.
1, 21 are taken out from the lower positions of the left and right side walls and the front side wall of the sub tank 18.

In the sub tank 18 described above, the coating liquid 1
1 is configured to supply the coating liquid 11 from the main tank 8 via the pump 7 so as to fill the top of the pyramid portion of the cover portion 25.

FIG. 4 shows still another structure of the sub-tank 4 of this embodiment, in which a bend pipe 24 is planted on the cover portion 25 and the coating liquid 11 is filled up to a position where the bend pipe 24 reaches a predetermined position. It was done by.

With the above construction, as shown in the side sectional view of the sub-tank 18 in FIG. 5A, the area 23 in contact with the air 26 in the vicinity of the pyramid portion of the cover 25 becomes small, so that the spray means 6 can be moved in the X and Y axis directions. It is possible to reduce the fluctuation of the liquid level in the sub-tank during the scanning.

In the above structure, the bend pipe 2 is attached to the cover portion 25.
4 is provided upright and the cover portion 25 is formed into a pyramid shape. In short, as shown in FIGS. 5A and 5B, it suffices to reduce the contact area of the liquid surface of the coating liquid 11 with the air, and as shown in FIG. 5B. The pyramidal portion of the portion 25 may be concave. Further, in this example, the film coating apparatus and method for the anti-reflection film of the CRT have been described, but the present invention is effective when applied to the case where the film is uniformly applied to the object to be coated having a large coating area.

[0025]

According to the film coating apparatus and the film coating method of the present invention, the height difference between the main tank and the spray gun is greatly increased by keeping the distance between the nozzle center position of the spray gun and the liquid level of the sub tank constant. Even if the object to be coated varies, the coating liquid from the spray gun has a constant discharge amount, and uniform coating is possible.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a film coating apparatus of the present invention.

FIG. 2 is a perspective view of the film coating apparatus of the present invention.

FIG. 3 is another perspective assembly view of the film coating apparatus of the present invention.

FIG. 4 is a side sectional view of a sub tank used in the film coating apparatus of the present invention.

FIG. 5 is a structural explanatory view of a sub tank of the present invention.

FIG. 6 is a film formation explanatory diagram of an antireflection film of a conventional CRT.

FIG. 7 is an explanatory diagram of a conventional film coating method.

FIG. 8 is a configuration diagram of a conventional film coating apparatus.

[Explanation of symbols]

1 CRT, 2 antireflection film, 3 face panel, 4
Spray gun, 6 spraying means, 8 main tanks,
14 spray gun support, 18 sub tank

Claims (4)

[Claims] 1. A film coating apparatus configured to scan a spray means arranged opposite to a surface of an object to be coated in the primary and secondary surface directions to apply a film onto the surface of the object to be coated. A sub-coating liquid storage means to be scanned with the spraying means is arranged above the spraying means, and the coating liquid is supplied from the main coating liquid storage means to the spraying means via the sub-coating liquid storage means. A film coating apparatus characterized by the above. 2. The film coating apparatus according to claim 1, wherein the sub-coating liquid storage means is provided with height adjusting means. 3. The film coating apparatus according to claim 1, wherein the sub-coating liquid storage means is provided with a shake preventing means for reducing a contact area between the coating liquid and air. 4. A film coating method, wherein a spraying device arranged opposite to the surface of the object to be coated is scanned in the primary and secondary surface directions to apply the film on the surface of the object to be coated. A film coating method, characterized in that the sub-coating liquid storage means of the spraying means is provided and the coating liquid is supplied from the main coating liquid storage means to the spraying means via the sub-coating liquid storage means.