KR100804769B1 - Pump module - Google Patents

Abstract

A pump module is provided to carry out fluid discharge at least twice or more per once fluid suction through lifting motion independent from rotation motion of a piston and gradual down of the piston, thereby achieving effective and fast fluid discharge. A pump module includes a cylinder received in a housing(110) and having an internal space with an inlet and an outlet, a piston(130) carrying out reciprocating motion in the cylinder and formed with an opening groove for alternatively opening the inlet and the outlet according to rotation positions, and a rotation actuator(150) rotating the piston. A linear actuator(140) lifts the piston for drawing in fluid when the inlet is opened and lowers the piston for discharging the fluid when the outlet is opened. A control part(160) controls the rotation actuator and the linear actuator for discharging the fluid via the outlet twice or more after the fluid is drawn in once.

Description

Pump module

1 is a perspective view of a pump module according to an embodiment of the present invention.

2 is an exploded perspective view of FIG. 1.

3 is an exploded perspective view showing a part of the pump module in Figure 2;

4 is a view for explaining a process of the piston descends step by step in FIG.

5 to 8 are views for explaining a fluid discharge process by the pump module shown in FIG.

<Brief description of the major symbols in the drawings>

110. Housing 120. Cylinder

121..intake 122..outlet

130 .. Piston 131 .. Open Home

140.Linear actuator 150.Rotary actuator

160..Control

The present invention relates to a pump module, and more particularly, to a pump module for discharging a fluid to a substrate in the manufacture of various flat panel displays.

A flat panel display (FPD) refers to an image display device that is thinner and lighter than a television or a monitor employing a CRT. Liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), organic light emitting diodes (OLEDs), and the like are developed and used as flat panel displays. have.

Among them, the liquid crystal display is a display device that can display a desired image by controlling the light transmittance of the liquid crystal cells by separately supplying data signals according to the image information to the liquid crystal cells arranged in a matrix form, which is thin, light, and power consumption. It is widely used due to the advantages of over operating voltage and low.

The manufacturing method of the liquid crystal panel generally employ | adopted for such a liquid crystal display is as follows, for example. First, a color filter and a common electrode are patterned on the upper glass substrate, and a thin film transistor (TFT) and a pixel electrode are patterned on the lower glass substrate facing the upper glass substrate. Subsequently, after the alignment films are applied to the substrates, the alignment films are rubbed to provide a pretilt angle and an orientation direction to the liquid crystal molecules of the liquid crystal layer formed therebetween. The seal paste is then applied in a predetermined pattern by a dispenser to any one of the substrates so as to maintain the gap between the substrates while preventing liquid crystals from leaking out and sealing the substrates. In this case, a process of dotting the conductive paste is further performed to connect the common electrode and the pixel electrode respectively formed on the substrates.

Then, after forming a liquid crystal layer between the substrates to manufacture a liquid crystal panel. As a method of forming a liquid crystal layer, the liquid crystal dropping method is mainly used in recent years. The liquid crystal dropping method is a method of dropping a liquid crystal using a liquid crystal dropping device in a space defined by a seal paste of a substrate, then bonding the substrates together, and then curing and bonding the seal paste.

In such a liquid crystal dropping method, in order to sufficiently secure the quality of the liquid crystal panel, it is a main issue to make the liquid crystal drop amount constant for each liquid crystal cell. Therefore, the pump module used in the liquid crystal dropping system needs to have a performance with high ejection accuracy so that quantitative ejection can be performed and excellent performance of ejection amount reproducibility so that the amount to be discharged every time can be constant.

The technical problem of the present invention is to provide a pump module that can not only improve the discharge accuracy of the fluid, but also ensures the discharge amount reproducibility sufficiently.

Pump module according to the present invention for achieving the above object, the cylinder having an inner space, the inlet and outlet are formed on both sides; A piston having an opening groove for rotating and lifting in the state inserted into the cylinder, the opening groove selectively opening the suction port and the discharge port according to the rotation position; A rotary actuator for rotating the piston; A linear actuator for lifting and lowering the piston so that fluid is sucked as the piston is raised when the inlet is opened and fluid is discharged when the piston is lowered when the outlet is opened; And a controller configured to control the rotary actuator and the linear actuator so that the fluid can be discharged two or more times by a predetermined amount after the fluid is sucked through the suction port once.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a pump module according to an embodiment of the present invention, Figure 2 is an exploded perspective view of FIG.

1 and 2, the pump module 100 according to an embodiment of the present invention, in the manufacture of various flat panel display functions to inhale the fluid in a predetermined amount and discharged to the substrate.

The fluid storage container 11 is provided above the pump module 100. Fluid reservoir 11 is filled with a fluid to supply the fluid to the pump module (100). Here, the fluid may be a liquid crystal when the pump module 100 is employed in a liquid crystal dropping apparatus for dropping liquid crystal onto a substrate to form liquid crystal cells.

 The fluid storage container 11 filled with the fluid may be mainly made of a material such as polyethylene so as not to react with the fluid. When the fluid storage container 11 is made of the material described above, it may be deformed by a weak external shock, and thus may be stored in the case 12 made of a rigid material such as stainless steel.

The emulsion storage container 11 is supported by the support 13. The support 13 is formed with a pin 14 having a flow path therein, like a needle. The pin 14 is coupled to one end of the first connector (15). In addition, the other end of the first connecting pipe 15 is coupled to the fluid intake 111 provided in the housing 110 of the pump module 100.

Accordingly, the fluid contained in the fluid reservoir 11 may be introduced into the fluid inlet 111 of the pump module 100 through the pin 14 and the first connecting pipe 15. As the pin 14 is installed in the fluid storage container 11, the fluid storage container 11 is detachable and detachable in the process of inserting and removing the pin 14 into the fluid storage container 11. Replacement of the storage container 11 can be simplified.

The nozzle 16 is provided below the pump module 100. The nozzle 16 is connected by the fluid discharge part 112 and the second connection pipe 17 provided in the housing 110. Accordingly, the fluid discharged from the fluid discharge part 112 may be discharged to the substrate through the nozzle 16 via the second connecting pipe 17. Here, the fluid discharge part 112 may be provided opposite to the fluid suction part 111. In addition, the nozzle 16 may be supported by the support block 102 provided in the bracket 101 of the pump module 100.

As such, the pump module 100 which sucks the fluid supplied from the fluid storage container 11 and discharges it through the nozzle 16 includes, together with the housing 110, a cylinder 120, as shown in FIG. 3. The piston 130 includes a linear actuator 140, a rotary actuator 150, and a controller 160.

The cylinder 120 is received in the interior space through the upper opening of the housing 110. The cylinder 120 has a cylindrical inner space to guide the vertical movement and the rotational movement of the piston 130. The cylinder 120 has an inlet 121 formed at one side thereof, and an outlet 122 formed at an opposite side of the inlet 121.

Here, the inlet 121 is formed to communicate with the fluid inlet 111 of the housing 110, thereby sucking the fluid supplied from the fluid storage container 11 into the cylinder 120. In addition, the discharge port 122 is formed to communicate with the fluid discharge part 112 of the housing 110, thereby discharging the fluid sucked into the cylinder 120 to the outside of the cylinder 120. The discharge port 122 may be disposed to form approximately 180 ° with the suction port 121, but is not limited thereto.

In a state in which the cylinder 120 is accommodated in the housing 110, a cap 115 for blocking the upper opening is installed in the housing 110. The cap 115 has a structure that allows the piston 130 to be inserted into the cylinder 120. In the housing 110, a sealing member 116 is provided on the upper side of the cylinder 120 to prevent leakage of the fluid.

The piston 130 has a cylindrical shape corresponding to the cylinder 120 having a cylindrical inner space and is inserted into the cylinder 120. In this state, the piston 130 is moved up and down by the linear actuator 140, and the rotary motion by the rotary actuator 150. In addition, an opening groove 131 is formed in the piston 130 to selectively open the inlet 121 and the outlet 122 of the cylinder 120 according to the rotational position.

The opening groove 131 is formed to have a predetermined width and length from the lower end to the side of the piston 130. On the other hand, the opening groove 131 is shown to have a V-shape, it may be formed to have a variety of shapes in the range that can selectively open the inlet 121 and the discharge port 122 according to the rotation position.

The linear actuator 140 raises and lowers the piston 130 to allow suction and discharge of the fluid. That is, the linear actuator 140 generates suction force in the cylinder 120 as the piston 130 is raised when the suction port 121 is opened, thereby allowing the fluid to be sucked, and when the discharge port 122 is opened. As the 130 is lowered, the earth output is generated in the cylinder 120 so that the fluid can be discharged.

The amount of fluid discharged in this way depends on the range of motion reciprocating between the top dead center where the piston 130 has stopped at the upper side and the bottom dead center which has been stopped at the lower side, that is, the stroke length of the piston 130. The longer the stroke length of the piston 130, the greater the amount of fluid discharged. On the contrary, the shorter the stroke length of the piston 130, the smaller the amount of fluid discharged.

Thus, according to the present embodiment, the linear actuator 140 is configured to adjust the stroke length of the piston 130 so that the amount of fluid discharged as desired. In addition, the linear actuator 140 is configured to independently lift and move the piston 130 while the piston 130 rotates by the rotary actuator 150. Accordingly, since the lifting and lowering motion of the piston 130 by the linear actuator 140 is not affected by the rotary actuator 150, not only can the discharge accuracy of the fluid be improved, but also the discharge amount reproducibility can be sufficiently secured. have.

In addition, as shown in FIG. 4, the linear actuator 140 may move the piston in at least two stages or more within a range of motion in which the piston 130 may move up and down, that is, the entire stroke length of the piston 130. To be lowered, it is controlled by the controller 160 to be described later.

The linear actuator 140 may include, for example, a piezoelectric element. When the piezoelectric element uses the reverse piezoelectric effect, it can cause mechanical displacement by using electricity as input energy. Since the piezoelectric element is capable of high precision control of the micro displacement and has a fast response, the piezoelectric element may finely adjust the amount of fluid discharged through the nozzle 16 and may be advantageous for quickly discharging the fluid. In addition, the piezoelectric element may have advantages in minimizing mechanical errors in the pump module 100 to further increase the discharge accuracy of the fluid.

As such, when the linear actuator 140 includes a piezoelectric element, the piezoelectric element may be coupled to the upper end of the piston 130. Here, the piezoelectric element is installed to extend downward when voltage is applied, and to generate a displacement that contracts upward in its original state when no voltage is applied. Therefore, the piston 130 is able to reciprocate up and down. On the other hand, the linear actuator 140 may be configured to include a linear motor as another example.

The rotary actuator 150 provides a rotational force to the piston 130 and rotates it so that the opening groove 131 opens the inlet 121 and the outlet 122 of the cylinder 120 according to the rotational position of the piston 130. Selectively open.

In detail, the rotary actuator 150 rotates the piston 130 so that the opening groove 131 opens the inlet 121 so that the fluid can be sucked into the lower space in the cylinder 120 through the inlet 121. . In addition, the rotary actuator 150 allows the opening groove 131 to escape from the inlet 121 and close the inlet 121 while opening the outlet 122 while the fluid is sucked into the lower space in the cylinder 120. The piston 130 is rotated to allow the fluid to be discharged through the discharge port 122. That is, the rotary actuator 150 allows the piston 130 to act as a valve for controlling the suction and discharge state of the fluid. In this embodiment, the rotary actuator 150 is configured to be able to reverse the rotation of the piston (130).

The rotary actuator 150 may be configured to include a rotary motor 151 capable of forward and reverse rotation, as shown. In this case, the rotating shaft of the rotating motor 151 is fixedly coupled to the rotating member 152 rotatably installed on the fixing part 103 so that the rotating force from the rotating motor 151 can be transmitted to the piston 130, The head 153 provided with the linear actuator 140 installed above the piston 130 may be fixedly coupled to the rotating member 152. On the other hand, the rotary actuator 150 is not limited to what is shown, as long as it can rotate the piston 130 may be any.

The controller 160 is for controlling the suction and discharge process of the fluid according to the rotation and lifting motion of the piston 130. That is, the controller 160 controls the rotary actuator 150 to rotate the piston 130 so that the open groove 131 can selectively open the inlet 121 and the outlet 122, while the inlet 121 By controlling the linear actuator 140 to raise the piston 130 at the time of opening) and to lower the piston 130 at the time of opening of the discharge port 122, the suction and discharge of the fluid are controlled.

According to the present exemplary embodiment, the controller 160 rotates the linear actuator 140 and rotates so that the fluid may be discharged at a set amount two or more times through the discharge port 122 after the fluid is sucked once through the suction port 121. Actuator 150 is controlled.

The suction and discharge process of the liquid crystal by the controller 160 will be described below with reference to FIGS. 5 to 8.

First, as shown in FIG. 5, the control unit 160 positions the open groove 131 of the piston 130 in the inlet 121 by the rotary actuator 150. When the inlet 121 is opened, the controller 160 raises the piston 130 to the point A by the linear actuator 140 to generate a suction force in the cylinder 120. In this case, the distance traveled to the point A of the piston 130 is a distance at which the fluid can be sucked to the extent that the fluid can be discharged at least twice a predetermined amount. Through the above-described process, the fluid may be sucked once into the lower space in the cylinder 120 through the inlet 121.

Next, as shown in FIG. 6, the controller 160 is positioned at the discharge port 122 by rotating the opening groove 131 from the suction port 121 by, for example, 180 ° counterclockwise by the rotary actuator 150. Let's do it. When the discharge port 122 is opened, the controller 160 lowers the piston 130 from the point A to the point B by the linear actuator 140 to apply the earth output to the fluid sucked into the cylinder 120. At this time, the distance that the piston 130 moves from the point A to the point B is the distance that the fluid can be discharged once in a set amount. Through the above-described process, the fluid may be discharged once to the outside of the cylinder 120 through the discharge port 122 in a set amount.

Next, as shown in FIGS. 7 and 8, the controller 160 opens and closes the discharge port 122 while the suction port 121 is continuously closed by the rotary actuator 150, and while the discharge port 122 is closed. When opened, the piston 130 is lowered by the linear actuator 140. Then, the fluid can be discharged once more in the set amount, that is, the fluid for the second time.

In detail, as shown in FIG. 7, after the fluid is discharged once by the above-described process, the controller 160 opens the opening groove 131 from the discharge port 122 by the rotary actuator 150. Rotate 90 ° toward). That is, the controller 160 positions the open groove 131 to correspond to the inner wall of the cylinder 120 between the suction port 121 and the discharge port 122, thereby closing both the suction port 121 and the discharge port 122. will be.

At this time, the controller 160 is rotated 90 ° of the opening groove 131 for the closing of the inlet 121 and discharge 122 122 180 ° rotation direction of the opening groove 131 for one-time discharge of the fluid to be described above The direction of rotation can be controlled to be opposite to. For example, when the control unit 160 rotates the opening groove 131 by 180 ° counterclockwise for one time discharge of the fluid, the control unit 160 watches the opening groove 131 for closing the inlet 121 and the outlet 122. The direction of rotation can be controlled to rotate 90 ° in the direction. This is to allow the rotation directions of the opening grooves 131 for the fluid discharge to be the same while the fluid is discharged two or more times, so that the discharge precision and discharge amount reproducibility of the fluid can be further improved.

Meanwhile, the controller 160 has a 90 ° rotational direction of the opening groove 131 for closing the inlet 121 and the discharge port 122 the same as the 180 ° rotational direction of the opening groove 131 for one-time discharge of the fluid. It is also possible to control the direction of rotation so that it is not necessarily limited thereto.

In addition, the controller 160 rotates the opening groove 131 by 90 ° from the discharge port 122 toward the suction port 121 by the rotary actuator 150, and the height of the piston 130 is increased after one discharge of the fluid. It is preferable to control the linear actuator 140 to maintain the state down to the point B. This is to allow the pressure applied to the fluid remaining in the cylinder 120 to be maintained after the fluid is discharged once, so that fluid discharge precision and discharge amount reproducibility can be sufficiently secured during subsequent fluid discharge.

With the opening groove 131 rotated by 90 ° between the inlet 121 and the outlet 122 by the above-described process, as shown in FIG. 8, the controller 160 is opened by the rotary actuator 150. 131 is rotated 90 degrees to reposition the discharge port 122. When the discharge port 122 is opened, the control unit 160 lowers the piston 130 from the next step, that is, from the point B to the point C by the linear actuator 140. At this time, the distance that the piston 130 moves from point B to point C is the distance that the fluid can be discharged once in a set amount. When the above-described process, the fluid can be discharged a second time in the set amount.

After the fluid is discharged a second time, if the amount of fluid remaining in the cylinder 120 is larger than the amount to be discharged once more in the set amount, the control unit 160 allows the fluid to be discharged in the set amount three times. do. At this time, the controller 160 causes the fluid to be discharged in the same process as the fluid is discharged a second time.

That is, the controller 160 rotates the open groove 131 from the discharge port 122 to the suction port 121 by the rotary actuator 150 to close both the discharge port 122 and the suction port 121. At this time, the controller 160 controls the linear actuator 140 to maintain the state in which the height of the piston 130 is lowered after two discharges of the fluid. Next, the controller 160 rotates the opening groove 131 by 90 ° by the rotary actuator 150 to reposition the discharge groove 122. When the discharge opening 122 is opened, the fluid is discharged by the linear actuator 140. The piston 130 is lowered to be discharged once at a set amount. Then, the fluid can be discharged the third time.

As described above, according to the present invention, after the fluid is sucked once by the control unit 160, the fluid is controlled to be discharged at least twice in a set amount in a state where the fluid is not further sucked. As a result, more efficient and rapid fluid discharging may be possible as compared with repeatedly performing the process of sucking and discharging the fluid once. In addition, according to the present invention, since the piston 130 discharges the fluid reciprocating the 90 ° angle range from the second time the fluid is discharged, the piston rotates 360 ° for the discharge of the fluid. Not only the required time can be sufficiently secured, but also the error of the discharge amount due to the machining error of the piston every discharge can be reduced. Therefore, the ejection accuracy and ejection reproducibility of the fluid can be improved.

If the amount of fluid remaining in the cylinder 120 is less than the amount to be discharged once more in the set amount, but the situation is to continue to discharge the fluid, the controller 160 is rotated as shown in FIG. The open groove 131 is positioned to the inlet 121 by the actuator 150. When the inlet 121 is opened, the controller 160 raises the piston 120 to the point A by the linear actuator 140, thereby allowing new fluid to be sucked into the cylinder 120 through the inlet 121. . In this state in which the fluid is newly sucked, the fluid discharge process may be performed in the same manner as described above.

Meanwhile, the controller 160 moves the opening groove 131 of the piston 130 to a position capable of closing both the suction port 121 and the discharge port 122 from the second time the fluid is discharged in the above-described process. It is also possible to control the rotary actuator 150 so that the process of making it can be omitted. That is, the controller 160 positions the open groove 131 in the inlet 121, raises the piston 130 to allow the fluid to be sucked once, and then places the open groove 131 in the outlet 122. In addition, the rotary actuator 150 and the linear actuator 140 may be controlled to lower the piston 130 step by step in proportion to the number of discharges.

In detail, as shown in FIG. 5, the controller 160 positions the opening groove 131 of the piston 130 at the suction port 121, and then raises the piston 130 to a point A, thereby allowing fluid to flow through the suction port. Through the 121 to be sucked into the lower space in the cylinder 120 once. Next, as shown in FIG. 6, the control unit 160 rotates the opening groove 131 by 180 ° from the suction port 121 to position the discharge port 122, and then moves the piston 130 from the A point to the B point. By lowering the fluid, the fluid can be discharged once to the outside of the cylinder 120 through the discharge port 122 in a set amount.

Subsequently, the controller 160 maintains the piston 130 at the point B while the opening groove 131 is positioned at the discharge port 122 while omitting the process illustrated in FIG. 7. In this state, as shown in FIG. 8, the controller 160 lowers the piston 130 from the B point to the C point, so that the fluid flows out of the cylinder 120 through the discharge port 122 in a set amount. Allow two discharges.

After the fluid is discharged a second time, if the amount of fluid remaining in the cylinder 120 is larger than the amount to be discharged once more in the set amount, the controller 160 is the same process as the fluid is discharged a second time By allowing the fluid to be discharged, the fluid can be discharged the third time at a set amount. As such, as the fluid is discharged by the controller 160, according to the present invention, the time required for one discharge may be sufficiently secured, as compared with the rotation of the piston by 360 ° for the fluid discharge. For each discharge, the error of the discharge amount due to the machining error of the piston can be further reduced. Therefore, the ejection accuracy and ejection reproducibility of the fluid can be improved.

If the amount of fluid remaining in the cylinder 120 is less than the amount to be discharged once more by the set amount, but the situation is to continue to discharge the fluid, the controller 160 is opened as shown in FIG. After positioning the groove 131 to the inlet 121, the piston 120 is raised to the point A so that the fluid can be freshly sucked into the cylinder 120 through the inlet 121.

As described above, according to the present invention, since the fluid may be discharged at least twice in a set amount after the fluid is sucked once and the fluid is not additionally sucked, the process of sucking and discharging the fluid once In comparison with repetitive performance, more efficient and rapid fluid discharge can be enabled.

Further, according to the present invention, the fluid is discharged while the piston discharges the fluid while the piston is reciprocally rotating in the 90 ° angle range, or the fluid is discharged while the piston descends stepwise while the discharge port is opened. In comparison with the rotation of the piston by 360 °, not only the time required for one discharge can be sufficiently secured, but also the error of the discharge amount due to the machining error of the piston can be reduced every time.

In addition, since the piston moves up and down independently of the rotational movement of the piston, and the fluid can be discharged as the piston descends in proportion to the number of discharges, the discharge accuracy can be improved and the discharge amount reproducibility is sufficiently secured. Can be. Therefore, if applied to dropping the liquid crystal in the liquid crystal panel may be effective in securing the quality of the liquid crystal panel.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (9)

delete A cylinder having an inner space and having inlets and outlets formed on both sides thereof; A piston having an opening groove for rotating and lifting in the state inserted into the cylinder, the opening groove selectively opening the suction port and the discharge port according to the rotation position; A rotary actuator for rotating the piston; A linear actuator for lifting and lowering the piston so that fluid is sucked as the piston is raised when the inlet is opened and fluid is discharged when the piston is lowered when the outlet is opened; And And a controller configured to control the rotary actuator and the linear actuator so that the fluid can be discharged at a predetermined amount two or more times after the fluid is sucked through the suction port once. The control unit, After placing the open groove in the inlet and raising the piston so that the fluid can be sucked once, the open groove is placed in the discharge port and the piston is lowered so that the fluid can be discharged once in a set amount. And controlling the rotary actuator and the linear actuator to open and close the discharge port while keeping the suction port closed, and to lower the piston so that the fluid can be discharged at least once in a set amount when the discharge port is opened. Pump module. The method of claim 2, The control unit, And controlling the rotary actuator to move the opening groove between a position corresponding to the inner wall of the cylinder and a position corresponding to the discharge port in order to open and close the discharge port while the suction port is kept closed. Pump module. The method of claim 2 or 3, The control unit, The linear actuator may be lowered in proportion to the number of discharges, and the linear actuator may be maintained in a lowered state while the opening groove is moved to close the discharge port after the discharge of the fluid. Pump module, characterized in that for controlling. The method of claim 4, wherein The control unit, And the rotational actuator is controlled so that the directions for rotating the opening grooves may be all the same while the fluid is discharged two or more times in a predetermined amount through the discharge port. A cylinder having an inner space and having inlets and outlets formed on both sides thereof; A piston having an opening groove for rotating and lifting in the state inserted into the cylinder, the opening groove selectively opening the suction port and the discharge port according to the rotation position; A rotary actuator for rotating the piston; A linear actuator for lifting and lowering the piston so that fluid is sucked as the piston is raised when the inlet is opened and fluid is discharged when the piston is lowered when the outlet is opened; And And a controller configured to control the rotary actuator and the linear actuator so that the fluid can be discharged at a predetermined amount two or more times after the fluid is sucked through the suction port once. The control unit, Position the open groove in the inlet and raise the piston to allow fluid to be sucked once, then place the open groove in the discharge port, and then lower the piston stepwise in proportion to the number of discharges; A pump module for controlling an actuator and a linear actuator. The method according to claim 2 or 6, And said linear actuator comprises a piezoelectric element. The method according to claim 2 or 6, The linear actuator pump module, characterized in that it comprises a linear motor. The method according to claim 2 or 6, The rotary actuator is a pump module, characterized in that it comprises a rotary motor.

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