JP3329365B2 - Method for forming CRT exterior conductive film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming an outer conductive film of a cathode ray tube, and more particularly to the movement of a cathode ray tube and an application roller when a graphite liquid is applied to an outer surface of a funnel of a cathode ray tube. is there.

[0002]

2. Description of the Related Art Conventionally, an apparatus for applying a graphite liquid to the outer surface of a funnel portion of a cathode ray tube (hereinafter referred to as an "outer conductive film forming apparatus").
That. ) Is, for example, Japanese Utility Model Application Laid-Open No. 2-117649.
An apparatus described in Japanese Patent Application Laid-Open No. H05-205624 and Japanese Patent Application Laid-Open No. H5-205624 is known.

In an apparatus for forming an exterior conductive film according to the technique disclosed in Japanese Utility Model Application Laid-Open No. 2-117649, a cathode ray tube is positioned and fixed with its neck portion directed upward. Then, the coating roller attached to the hand part of the arm installed on the upper part of the CRT is impregnated with the graphite liquid, and the amount of the graphite liquid impregnated in the coating roller is adjusted by the squeezing mechanism. By performing the control, the graphite liquid is applied to the outer surface of the funnel portion of the cathode ray tube.

Further, in an apparatus for forming an exterior conductive film according to the technique disclosed in Japanese Patent Application Laid-Open No. 5-205624,
The cathode ray tube is positioned and fixed with its neck portion directed upward. Then, the application roller attached to the hand part of the arm installed on the upper part of the CRT is impregnated with the graphite liquid, the amount of the graphite liquid impregnated in the application roller is adjusted by a squeezing mechanism, and the end of the application roller is further adjusted. After squeezing only the portion, the application roller is controlled and the application roller is forcibly rotated to apply the graphite liquid to the outer surface of the funnel portion of the CRT. In this prior art, the application finish is detected after the application, and the control of the pressing force of the application roller is performed based on the detection result.

[0005]

However, in the above-described apparatus for forming an exterior conductive film according to the prior art, since the outer surface of the funnel portion of the cathode ray tube which is positioned and fixed has a complicated curved surface, it is installed above the cathode ray tube. The application roller attached to the hand part of the arm is forced to perform a complicated operation of orbiting around the CRT and applying the graphite liquid. Therefore, the application time is long and the working efficiency is not good.

Also, since the cathode ray tube is fixed,
Teaching work of the application roller attached to the hand portion of the arm is a work while rotating, and the work itself is difficult and requires a long time. Further, since there is no specific operation of the application roller, the teaching operation is performed by visual confirmation, which makes the operation itself more difficult and also requires a longer time. Similarly, in the teaching correction, the operation is difficult and requires a long time.

In such a conventional apparatus for forming an exterior conductive film, the uniformity of the film when the exterior conductive film is formed depends on the amount of graphite liquid held by the application roller, the pressing state of the application roller, and the moving speed of the application roller. When these balances are not appropriate, poor graphite sagging and poor graphite fading occur. These (the amount of the graphite liquid held by the application roller, the pressing state, the moving speed, and the like) are often determined by the teaching operation of the application roller. Therefore, the occurrence of graphite sagging failure and graphite fading failure depends on the quality of the teaching work of the application roller.

Further, in the prior art, the impregnation of the coating liquid with the graphite liquid is performed intermittently by the transfer roller, so that the graphite liquid on the coating roller is easily cured, and it is difficult to form a uniform exterior conductive film. In addition, the necessity of frequent replacement of the application roller arises, which lowers the work efficiency.

Further, in the conventional device for forming an exterior conductive film, since the hand portion (coating roller) of the arm is disposed above the head of the device, there is a problem in maintainability.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and simplifies the operation of the application roller attached to the exterior conductive film forming apparatus, thereby simplifying and teaching the operation of teaching the application roller. It is an object of the present invention to provide an apparatus and a method for forming a CRT exterior conductive film capable of improving efficiency, preventing graphite sagging failure and graphite fading failure, and improving maintenance efficiency with high efficiency.

[0011]

According to the present invention, there is provided a method of forming an outer conductive film for a cathode ray tube, which comprises rotating the cathode ray tube and moving an application roller impregnated with a graphite liquid. the a outer conductive film forming method of the Brownian tube the funnel outer surface of the cathode ray tube performing coating of the graphite solution, depending on the application roller
With a corner on the outer surface of the funnel of the CRT
When performing close coating, reduce the rotation speed of the CRT
It is characterized by doing.

Another conductive film for a cathode ray tube according to the present invention.
The formation method consists of the operation of rotating the CRT and the graphite liquid.
By moving the impregnated coating roller,
Apply the graphite liquid to the outer surface of the funnel of the CRT
Performing the method of forming an exterior conductive film for a cathode ray tube, wherein
Rotate the round tube outside the funnel of the CRT
For the upper region formed on the neck side on the surface
An upper coating step of applying the graphite liquid by
Rotate the tube to the outer surface of the funnel of the CRT
In the lower region formed on the panel side
Separately from the step coating process, the lower coating step of applying the graphite liquid
Between the upper coating step and the lower coating step.
Moving the application roller between the upper stage and the lower stage
And a moving step.

[0013] The neck of the CRT is directed upward.
In this state, rotate the cathode ray tube around a vertical axis,
First, the graphite liquid is applied to the upper region,
After reducing the amount of the graphite liquid contained in the roller,
It is preferable to apply the lower region.

By rotating the CRT forward, the upper stage
After applying the graphite liquid to the area, the application roller is
Move from the upper stage to the lower stage, reverse rotation of the cathode ray tube
It is preferred that the lower region be coated in this manner.

[0015] The coating roller is used to
When applying near the corner of the funnel outer surface
Preferably, the rotation speed of the cathode ray tube is reduced.
No.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus for forming an exterior conductive film according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the overall configuration of the exterior conductive film forming apparatus according to the present embodiment, and FIG. 2 is a front view of the exterior conductive film forming apparatus shown in FIG. 1 and 2, the apparatus for forming an exterior conductive film according to the present embodiment is a robot having a plurality of rotation axes and the like, and includes a CRT holding section, a graphite liquid application section, a graphite liquid replenishing section, and a control section. Have been.

The CRT holding unit is a general term for each unit having a function of transporting, holding, and rotating the CRT 1, for example, a CRT rotation motor 8, a CRT centering jig 9, a transport pallet. The suction pad 11, the suction pad vertical drive mechanism 12, and the like correspond to this. The graphite liquid application section is a general term for each section having a function of applying the graphite liquid to the CRT 1, and the like.
The arm 4 and the coating roller 2 attached to the hand unit 3 of the arm 4 correspond to the arm 4. The graphite liquid replenishment section
The components having the function of replenishing the application roller 2 with the graphite liquid are collectively referred to as the transfer roller 5, the slit plate 6, the auxiliary roller 7, and the like. The control unit has functions such as inputting a predetermined value to perform an appropriate movement and storing and reproducing data during teaching work in order to control the exterior conductive film forming apparatus which is a robot. And the robot control panel 13 corresponds to this.

The apparatus for forming an exterior conductive film according to the present embodiment comprises:
The graphite liquid can be uniformly applied to the outer surface 1A of the funnel portion of the cathode ray tube 1 by appropriately controlling each of the above members. Hereinafter, the operation of the exterior conductive film forming apparatus will be described.

First, the cathode ray tube 1 is intermittently transported to the graphite coating position by the transport pallet 10 with the panel side facing downward. The CRT 1 thus conveyed is adsorbed by the suction pad 11 and is raised as it is by actuating the suction pad vertical drive mechanism 12, and is then centered by being pressed diagonally by the CRT centering jig 9. ,
After that, it is fixed by the suction pad 11.

The application roller 2 attached to the hand portion 3 of the arm 4 receives the supply of the graphite liquid 14 from the transfer roller 5 and scrapes the excess graphite liquid 14 with the slit plate 6 as shown in FIG. Dropping and waiting in a state where the graphite liquid 14 is kept at an appropriate amount (application roller standby position state 2A)
Is shown in FIG. ). Also, this hand part 3
Automatically and appropriately replaces the application roller 2 (for example,
Replace every 3 hours. ) Is set as follows. The slit plate 6 is formed using a stainless steel plate, the contact surface with the application roller 2 has a curved shape (hereinafter referred to as “R shape”), and the contact angle of the end surface is 1 to 5 degrees. According to the method shown in FIG. 5, since the application roller 2 is appropriately replaced, it is possible to always receive the supply of an appropriate amount of the graphite liquid 14, prevent the graphite liquid 14 from being hardened, and prevent the graphite fading defect. it can. Since the excess graphite liquid 14 on the application roller end surfaces 2B and 2C can be removed by the slit plate 6, the graphite liquid 14 can be efficiently applied to the funnel outer surface 1A of the CRT 1.
As the material of the application roller 2, a sponge roller (for example, # 2610 made by Kanebo) having good water retention and being hard to cure is employed. The size of the application roller 2 is changed according to the size of the cathode ray tube 1 to which the graphite liquid 14 is applied so that the exterior conductive film can be formed in the best condition by changing the diameter and the length.

After the centering of the cathode ray tube 1 is completed, the cathode ray tube 1 is rotated, the application roller 2 which has been waiting is pressed along the funnel outer surface 1A of the cathode ray tube 1, and the graphite liquid 14 is applied to a predetermined area. The exterior conductive film 1B is formed. At this time, the rotation direction of the cathode-ray tube 1 is appropriately combined with the forward rotation and the reverse rotation to obtain a good exterior conductive film 1B.
Is selected, and set and input to the robot control panel 13 in advance. At this time, the rotation speed is also appropriately selected and set. Therefore, in the present embodiment, the rotation speed is appropriately changed (necessary while providing the CRT 1 with forward rotation and reverse rotation appropriately (if it is not necessary, while giving rotation in only one direction)). (If not, at a constant speed), the coating roller 2 is pressed along the funnel outer surface 1A of the cathode ray tube 1 to form a good exterior conductive film 1B.

The rotating operation of the suction pad 11 on which the cathode ray tube 1 is mounted is controlled as one axis of the exterior conductive film forming apparatus, and is completely synchronized with the arm 4, so that the cathode ray tube 1 is rotated to freely set teaching at an arbitrary position. It is possible to do. That is, since the control of the external axis for rotating the cathode ray tube 1 is coordinated with the arm 4 by adding one axis, the rotation angle can be arbitrarily set according to the funnel outer surface 1A of the cathode ray tube 1 and the coating is performed. Teaching work of the roller 2 can be dramatically improved. In addition, the efficiency of the coating operation itself can be increased.
The coating operation can be performed at the same speed as when coating is performed using two arms from both sides of the cathode ray tube. Furthermore, by rotating the cathode ray tube 1,
Since the movement of the arm 4 can be reduced, not only the arm 4 but also the exterior conductive film forming apparatus itself can be reduced.

Next, the graphite liquid 1 is applied to the outer surface 1A of the funnel.
Of Coating Roller 2 and CRT 1 during Coating 4
The rotation pattern will be described. These movement and rotation patterns are programmed in advance in a computer such as a robot control panel 13 for controlling the arm 4 and the like. A specific pattern is shown in FIG. First,
As shown in FIG. 3, the application is started from the point 20 toward the upper stage using the application roller 2 by the normal rotation of the cathode ray tube 1 itself. Then, the cathode ray tube 1 rotates backward from the point 21, and the graphite liquid 14 is applied to a predetermined lower area using the reverse rotation of the cathode ray tube 1 and the application roller 2. 21 'between points 20 and 20'
From 21 to 21, application is performed by moving the application roller 2 without rotating the CRT 1. The order in which the graphite liquid 14 is applied to the CRT 1 is as follows: first, from the upper stage (the neck portion side of the CRT 1), the amount of the graphite liquid 14 contained in the application roller 2 is reduced, and then the lower stage is applied. I do. This prevents the graphite liquid 14 from dripping when the lower layer is applied.

The width of the application roller 2 is, for example, 80 to 150.
mm and appropriately changed according to the size of the CRT 1. In the present embodiment, the upper 70% of the application roller 2 is used when performing the upper application, and the lower 70% of the application roller 2 is used when performing the lower application, so that the overlapping portion is reduced by 20%.
%. FIG. 6 shows an application roller 15 for applying the upper stage of the CRT 1 when the application roller 2 applies the graphite liquid along the funnel outer surface 1A, and the CRT 1
2 shows the state of the application roller 16 for performing application in the lower stage and their overlapping portions. The diameter of the application roller 2 is, for example, 50 to 100 mm.
It is changed appropriately according to the size of. In the application pattern using forward rotation and reverse rotation as in the present embodiment, 6
It is possible to correspond to a cathode ray tube having a size of about 21 inches to 21 inches, and the application time is about 10 to 15 seconds. FIG. 4 shows an application schedule relating to the forward rotation and the reverse rotation speed of the cathode ray tube 1 according to the present embodiment.

In this embodiment, the application of the graphite liquid to small and medium-sized CRTs has been described. However, the present invention is not limited to this. Similar effects can be obtained. For example, when this embodiment is applied to a large cathode ray tube of 24 inches to 32 inches, the application may be performed in a forward direction, a reverse direction, and a forward direction in addition to the middle-stage coating. At this time, the application time is about 15 to 22 seconds. FIG. 7 shows a coating pattern when the present embodiment is applied to a large CRT, and FIG. 8 shows a coating schedule. FIG. 9 shows the CRT 1 when the graphite liquid is applied along the funnel outer surface 1A. An application roller 17 for applying the upper stage, an application roller 18 for applying the lower stage of the cathode ray tube 1, an application roller 19 for applying the middle stage of the cathode ray tube 1, and states of overlapping portions thereof are shown.

Also, at the corner points 22, 23, 24 and 25 on the outer surface of the funnel in FIGS. 3 and 7, since the R shape is particularly small, dripping or blurring of the graphite liquid is likely to occur. Therefore, in such a place, it is necessary to increase the teaching points and perform fine teaching. In the present embodiment, the CRT 1
Is completely synchronized with the movement of the application roller 2, teaching at each point becomes easy, and the time is also reduced to about 1/3 of the conventional time.

Further, by rotating the cathode ray tube 1 forward and backward, the operating range of the arm 4 can be reduced, so that the application of the graphite liquid 14 can be performed in a short time, and the efficiency can be improved by 25% or more. Can be achieved. In addition, since the arm 4 is not mounted on the upper part but mounted, it is possible to improve the maintainability and reduce the size. Further, as described above, the operating range of the arm 4 can be reduced, and the overall apparatus can be reduced in size and efficiency, so that a highly productive manufacturing line can be constructed. .

[0029]

As described above, according to the apparatus for forming an exterior conductive film of a cathode ray tube according to the present invention, the operation of the application roller can be simplified by rotating the cathode ray tube. It is possible to simplify the operation and improve the operation efficiency, to prevent the sagging failure of the graphite and the fading graphite, to improve the efficiency of the entire apparatus and to improve the maintainability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a cathode ray tube exterior conductive film forming apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the exterior conductive film forming apparatus shown in FIG. 1;

FIG. 3 shows an example of an exterior conductive film forming apparatus shown in FIG.
Diagram showing the application trajectory when applying an exterior conductive film to small and medium-sized cathode ray tubes

FIG. 4 is a diagram showing a coating schedule relating to a forward rotation speed and a reverse rotation speed of the cathode ray tube in FIG. 3;

FIG. 5 is a view for explaining a process of supplying a graphite liquid to a coating roller in the exterior conductive film forming apparatus shown in FIG. 1;

FIG. 6 is a view for explaining a state in which coating is performed by pressing an application roller in the exterior conductive film forming apparatus shown in FIG. 1 against an outer surface of a funnel portion of a small or medium-sized CRT;

FIG. 7 shows an example of an exterior conductive film forming apparatus shown in FIG.
Diagram showing the application trajectory when applying an exterior conductive film to a large cathode ray tube

FIG. 8 is a diagram showing a coating schedule relating to the forward rotation speed and the reverse rotation speed of the cathode ray tube in FIG. 7;

9 is a view for explaining a state in which the application roller in the apparatus for forming an exterior conductive film illustrated in FIG. 1 is pressed against the outer surface of the funnel of the large CRT to perform application.

[Explanation of symbols]

Reference Signs List 1 CRT 1A Funnel outer surface 2 Coating roller 2B Coating roller end surface 2C Coating roller end surface 14 Graphite liquid 22, 23, 24, 25 Corner portion of funnel outer surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 9/20

Claims (5)

(57) [Claims] And operation 1. A rotating cathode-ray tube, the operation and moving the application roller impregnated with graphite solution, the outer conductive film formed of Brownian tube to perform coating of the graphite solution to the funnel outer surface of said cathode ray tube a method, wherein the cathode ray tube of the funnel by the application roller
When applying near the corner of the outer surface,
Cathode-ray tube characterized by reducing the rotation speed of the tube
The method of forming an exterior conductive film . 2. An operation for rotating a cathode ray tube, and a graphite liquid.
By moving the application roller impregnated with
Coating the graphite liquid on the outer surface of the funnel of the CRT
A method of forming an exterior conductive film for a cathode ray tube, wherein the cathode ray tube is rotated so that the funnel of the cathode ray tube is rotated.
Upper region formed on the neck side on the outer surface of the
An upper coating step of applying the graphite liquid to the CRT, and rotating the CRT to a funnel of the CRT.
In the lower area formed on the panel side on the outer surface of the
On the other hand, the graphite liquid is applied separately from the upper application step.
Between the lower coating step and the upper coating step and the lower coating step.
Moving the application roller between the upper stage and the lower stage
A method for forming an exterior conductive film of a cathode ray tube , comprising a moving step . 3. The cathode ray tube has a neck portion directed upward.
In the state, the cathode ray tube is rotated around a vertical axis,
First, the graphite liquid is applied to the upper region,
After reducing the amount of the graphite liquid contained in the cloth roller,
The method for forming an exterior conductive film for a brown tube according to claim 2, wherein the lower region is coated . 4. The method according to claim 1, wherein the cathode ray tube is rotated forward and the upper stage is rotated.
After applying the graphite liquid to the area, the application roller is moved forward.
Move from the upper stage to the lower stage and rotate the CRT in reverse
The method for forming an outer conductive film for a brown tube according to claim 3, wherein the lower region is applied by coating . 5. A cathode ray tube according to claim 1 , wherein
When applying near the corner of the outer surface of the funnel
To, to decelerate the rotation speed of said cathode ray tube, according to claim 2
5. The method for forming an exterior conductive film of a cathode ray tube according to any one of 4 .