JP3840964B2 - Paste applicator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paste application apparatus that applies a high-viscosity paste, and more particularly to a paste discharge mechanism of a paste application apparatus.
[0002]
[Prior art]
When manufacturing a semiconductor device or a display, a paste coating apparatus that applies a high-viscosity paste is used in various processes. For example, in a manufacturing process of a color plasma display, a paste coating apparatus is used when a frit agent for bonding a front substrate and a rear substrate is applied.
[0003]
FIG. 5 shows an outline of the paste application operation when the paste is discharged and when it is not discharged by the conventional paste applying apparatus.
[0004]
A paste application device having a paste tank 1, a shutter 22, a nozzle 6, a shutter receiver 24, and a shutter opening / closing cylinder 12 is installed in a three-axis robot, and is set in advance on a glass substrate 14 fixed to an application stage. The robot runs on top and performs an operation of applying the paste 13. By filling the paste 13 and pressurizing the sealed paste tank 1 and operating the cylinder 12, the paste 13 in the paste tank 1 is discharged and the paste 13 is applied.
[0005]
That is, as shown in FIG. 5A, when the shutter 22 is open, the paste 13 is applied from the inside of the paste tank 1 to the glass substrate 14 through the paste passage hole 23 of the shutter, the opening 27 of the shutter receiver 24 and the nozzle hole 18. Is done.
[0006]
Further, as shown in FIG. 5B, when the shutter 22 is moved in the right direction in the drawing by the cylinder 12 and the shutter 22 is closed, the paste passage hole 23 is blocked and the paste application is interrupted.
[0007]
[Problems to be solved by the invention]
However, in the conventional method, particularly when the paste is applied in the form of a broken line, even if the shutter 22 is closed, the paste 13 remaining from the shutter 22 to the nozzle 6 cannot be pressure-controlled, so the paste to which the remaining paste 13 has already been applied. As shown in FIG. 5 (B), a paste pool 29 is generated at the tip of the nozzle 6, and as shown in FIG. 5 (C), stringing 25 and paste balls 26 are generated. There is a disadvantage that the broken line shape and the variation in the coating length occur.
[0008]
Accordingly, an object of the present invention is to provide a paste application device having a paste discharge mechanism in which such stringing and paste balls do not occur.
[0009]
[Means for Solving the Problems]
A feature of the present invention is that it has a coating nozzle, a shutter receiver on the coating nozzle, and a shutter on the shutter receiver, and the shutter is opened when the paste passage hole of the shutter coincides with the nozzle hole of the coating nozzle. The paste is provided with a paste discharge mechanism in which the paste is applied, the shutter moves in the horizontal direction, the paste passage hole of the shutter is separated from the nozzle hole of the application nozzle, the shutter is closed, and the paste is not applied In the coating apparatus, a shutter protrusion is provided on the surface of the shutter near the paste passage hole and at a position in the moving direction where the shutter is in the closed state from the open state, and the moving direction of the shutter is on the surface of the shutter receiver The shutter protrusion slides in a saddle-fitting structure in the width / depth direction, and one end communicates with the nozzle hole. The grooves shutter projection provided a mobile paste application apparatus that performs for opening and closing of said shutter while the shutter projection is slid by fitted to the shutter projection groove.
[0010]
Here, it is preferable that the shutter protrusion has a cylindrical shape from the viewpoint of facilitating closing and sliding of the end.
[0011]
The paste passage hole is circular, and the shortest distance between the paste passage hole and the shutter protrusion is preferably 0 or more and 3/2 or less of the diameter of the circle.
[0012]
Further, the shutter receiver is provided with a paste leak tray, and the paste can flow out from the other end of the shutter projection groove to the paste leak tray.
[0013]
Further, it is practically preferable that an opening is provided in the shutter receiver, and one end of the shutter projection groove communicates with the nozzle hole through the opening.
[0014]
Furthermore, it is preferable that the opening of the shutter receiver has a circular shape having the same diameter as the upper end of the nozzle hole, and the width of the shutter projection groove is smaller than the diameter.
[0015]
Further, the paste passage hole of the shutter may have a circular shape having the same diameter as the opening of the shutter receiver and the upper end of the nozzle hole.
[0016]
Further, the shutter may be configured to have a rectangular plate material, and a longitudinal direction thereof may be a moving direction. In this case, an end portion of the rectangular plate material is formed by superimposing a plurality of plate materials, and a notch portion coupled to the cylinder can be provided here.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a paste coating apparatus according to an embodiment of the present invention. FIG. 2 is a paste application operation diagram of the paste discharge mechanism according to the embodiment of the present invention. FIG. 2 (A) shows a paste discharge time, and FIG. 2 (B) shows a paste non-discharge time.
[0018]
FIG. 3 is a component diagram of the shutter according to the embodiment of the present invention, FIG. 3 (A) is a top view, and FIG. 3 (B) is a side view. FIG. 4 is a component diagram of the shutter receiver according to the embodiment of the present invention. FIG. 4 (A) is a top view and FIG. 4 (B) is a side view.
[0019]
First, referring to FIG. 1, in a paste application apparatus, an impeller 10 for stirring paste is provided in a paste tank 1 for storing a paste 13, and an air supply port 11 is provided above.
[0020]
Below the paste tank 1, a paste discharge mechanism is coupled. This paste discharge mechanism includes a shutter receiver 4, a shutter 2 that moves in a horizontal direction (left and right in the figure) by a cylinder 12, that is, an opening / closing operation by the cylinder 12, and a nozzle 6.
[0021]
Next, referring to FIG. 2 (A), the paste application apparatus shown in FIG. 1 is installed in a three-axis robot, and the robot moves on a preset application locus on a glass substrate 14 fixed to the application stage. It travels and the operation | movement which apply | coats the paste 13 is performed.
[0022]
That is, the paste 13 is filled, the inside of the sealed paste tank 1 is pressurized, the cylinder 12 is operated, the shutter 2 is opened, and the paste 13 in the paste tank 1 is discharged, onto the substrate 14. Apply.
[0023]
A shutter projection 3 is provided on the surface (lower surface in the figure) of the shutter 2 in the vicinity of the paste passage hole 7 of the shutter 2 and in the moving direction (right direction in the figure) where the shutter is changed from the open state to the closed state. 4 (the upper surface in the figure) extends in the moving direction of the shutter 2, the shutter protrusion 3 slides in a squeezed structure in the width and depth directions, and one end of the shutter projects into the nozzle hole 18 of the nozzle 6. The shutter projection groove 5 communicated through the receiving opening 17 is provided, and the shutter projection 3 is engaged with the shutter projection groove 5 and is slid and moved for the opening / closing operation of the shutter. Therefore, even in the open state of FIG. 2A, the paste 13 is also present in a small portion of the shutter projection groove 5 between the opening 17 of the shutter receiver 4 and the shutter projection 3.
[0024]
In this embodiment, the shape of the upper end of the nozzle hole 18 of the nozzle 6 and the opening 17 of the shutter receiver 4 are circular with the same diameter D, and both are always located in the same planar shape. The paste passage hole 7 of the shutter 2 is also circular with the same diameter D as the nozzle hole 18 and the opening 17. When the paste passage hole 7 is located in the same plane shape as the nozzle hole 18 and the opening 17, it is in an open state, and when the shutter moves laterally and the paste passage hole 7 is completely removed from the nozzle hole 18 and the opening 17. Closed.
[0025]
Thereafter, as shown in FIG. 2B, the shutter 2 is moved rightward in the drawing by the cylinder 12 to close the shutter 2 so that the paste 13 is not discharged.
[0026]
At this time, the volume of the shutter projection groove 5 between the opening 17 of the shutter receiver 4 and the shutter projection 3 is increased, and the paste 13 remaining in the nozzle hole 18 is drawn so that the paste 13 is filled therein. Therefore, the paste 13 at the tip of the nozzle 6 is in a recessed state 19 and is in a so-called good state.
[0027]
Referring to FIG. 3, the shutter 2 has a paste passage hole 7 through which the paste 13 passes from the inside of the paste tank 1 when the shutter 2 is open, and a cylindrical shutter protrusion in the vicinity of the direction in which the shutter 2 closes. 3 are integrally formed.
[0028]
The shortest distance L between the circular paste passage hole 7 having the diameter D and the shutter protrusion 3 may be zero. That is, the outer shapes of the paste passage hole 7 and the shutter protrusion 3 may be in contact with each other in a planar shape. On the other hand, in order to increase the ratio of the volume of the shutter projection groove 5 in the closed state to the volume of the shutter projection groove 5 in the open state to obtain a practical residual paste pulling effect, the shortest interval L is set at the paste passage hole 7. The diameter D is preferably 3/2 or less.
[0029]
Further, the shutter 2 is configured to have a rectangular plate material, the longitudinal direction thereof is the moving direction, and the end portion of the plate material provided with the notch portion 16 coupled to the cylinder is deformed by superimposing two plate materials. Does not occur.
[0030]
With reference to FIG. 4, the shutter receiver 4 is formed with a shutter projection groove 5 extending from the opening 17 so that the shutter projection 3 of the shutter 2 can be fitted and slid therethrough.
[0031]
The shutter protrusion 3 and the shutter protrusion groove 5 are fitted and surface-polished so that the paste 13 does not ooze out from the front and rear of the shutter 2 by opening / closing operation by driving the cylinder 12 and pressure feeding of the paste 13. Considering the wear of the shutter 2 and the shutter receiver 4 after continuous use, a form in which a paste leak tray 8 is formed on the shutter receiver 4 and the opening 17 and the paste leak tray 8 are connected by the groove 5 for the shutter protrusion It has become. In other words, the paste leak tray 8 receives the leakage of the paste from the wear of the shutter and the gap between the shutter and the shutter receiver that is created when used for a long period of time.
[0032]
As described with reference to FIG. 2, the volume of the shutter projection groove 4 terminated by the shutter projection 3 from the paste passage hole 7 is changed by combining the above and opening and closing the shutter 2.
[0033]
Further, before applying the paste, the shutter 2 blocks the paste passage hole 7, and pressure is controlled from the air supply port 11 while stirring the paste 13 inside the paste tank 1 with the impeller 10 inside the tank. The compressed air is pumped into the tank to prepare for paste application.
[0034]
When the glass substrate 14 is fixed and reaches the application start point on the preset application locus, the paste application unit opens the shutter 2 by the operation of the cylinder 12 and passes through the paste passage hole 7 formed in the shutter 2. The paste 13 starts to be discharged.
[0035]
From the application start point to the application end point, the paste application can be selected from a continuous solid line shape and an intermittent broken line shape, and the cylinder 12 is driven to close the shutter 2. .
[0036]
As described above, when the shutter 2 is closed, the paste passage hole 7 is blocked and the paste application is interrupted, and at the same time, the distance of the shutter projection groove 5 from the paste passage hole 7 to the shutter projection 3 is increased. Since the paste 13 staying from the nozzle 6 to the nozzle 6 is attracted in that direction, the paste 13 at the tip of the nozzle 6 is attracted into the nozzle 6.
[0037]
【The invention's effect】
In this way, particularly when the paste application is performed in a broken line shape, the shutter protrusion 3 also moves simultaneously when the shutter 2 is closed. As a result, the distance of the shutter projection groove 5 from the paste passage hole 7 to the shutter projection 3 is increased, and the space in which the paste 13 remaining in the nozzle 6 from the shutter 2 wraps around, that is, the volume of the shutter projection groove 5 is expanded. Therefore, since the paste 13 at the tip of the nozzle 6 is attracted into the nozzle 6, the cutting with the already applied paste 13 is improved, and the stringing 15 and the paste balls 16 are not generated.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a paste coating apparatus according to an embodiment of the present invention.
FIGS. 2A and 2B are diagrams illustrating a paste application operation of the paste discharge mechanism according to the embodiment of the present invention, where FIG. 2A illustrates a paste discharge time, and FIG.
FIG. 3 is a component diagram of the shutter according to the embodiment of the present invention, (A) is a top view;
4A and 4B are part views of the shutter receiver according to the embodiment of the present invention, in which FIG. 4A is a top view and FIG. 4B is a side view.
FIG. 5 is a paste application operation diagram of a paste discharge mechanism in a conventional paste application apparatus, where (A) shows when a paste is discharged, (B) shows when no paste is discharged, and (C) shows its disadvantages. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paste tank 2 Shutter 3 Shutter protrusion 4 Shutter receiver 5 Shutter protrusion groove 6 Nozzle 7 Paste passage hole 8 Paste leak tray 10 Impeller 11 Air supply port 12 Shutter opening / closing cylinder 13 Paste 14 Glass substrate 16 Notch portion 17 Opening of shutter receiver 18 Nozzle hole 19 Recessed state 22 Shutter 23 Paste passage hole 24 Shutter receiver 25 Threading 26 Paste ball 27 Shutter receiver opening 29 Paste pool

Claims (9)

It has a coating nozzle, a shutter receiver on the coating nozzle, and a shutter on the shutter receiver, and when the paste passage hole of the shutter coincides with the nozzle hole of the coating nozzle, the shutter is opened to apply the paste. In the paste application apparatus provided with a paste discharge mechanism, the shutter moves laterally, the paste passage hole of the shutter moves away from the nozzle hole of the application nozzle, and the shutter is closed to prevent the paste from being applied. A shutter projection is provided on the surface of the shutter in the vicinity of the passage hole and in the moving direction where the shutter is in the closed state from the open state, and the surface of the shutter receiver extends in the moving direction of the shutter, For shutter projections where the shutter projection slides in a saddle-fitting structure in the width / depth direction and one end communicates with the nozzle hole The provided, paste coater, characterized in that said shutter projection was to perform the movement for the opening and closing operation of the shutter while sliding by fitted to the shutter projection groove. The paste coating apparatus according to claim 1, wherein the shutter protrusion has a cylindrical shape. The paste according to claim 1, wherein the paste passage hole has a circular shape, and the shortest distance between the paste passage hole and the shutter projection is not less than 0 and not more than 3/2 of the diameter of the circle. Coating device. 2. The paste application apparatus according to claim 1, wherein a paste leak receiving tray is provided in the shutter receiver, and paste flows out from the other end of the shutter projection groove to the paste leak receiving tray. The paste coating apparatus according to claim 1, wherein one end of the shutter projection groove communicates with the nozzle hole through the opening of the shutter receiver. 2. The paste coating apparatus according to claim 1, wherein the opening of the shutter receiver has a circular shape having the same diameter as the upper end of the nozzle hole, and the width of the groove for shutter projection is smaller than the diameter. The paste application device according to claim 6, wherein the paste passage hole of the shutter has a circular shape having the same diameter as the opening of the shutter receiver and the upper end of the nozzle hole. The paste applying apparatus according to claim 1, wherein the shutter has a rectangular plate material, and a longitudinal direction thereof is a moving direction. 9. The paste coating apparatus according to claim 8, wherein a plurality of plate materials are overlapped at an end portion of the rectangular plate material, and a notch portion coupled to the cylinder is provided here.

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