JP5666278B2 - Liquid supply device - Google Patents

Description

  The present invention relates to a liquid supply apparatus that supplies a liquid such as an adhesive.

  In the electronic component mounting field, when an electronic component is fixed to a substrate, a liquid as an adhesive is applied to the substrate. A liquid such as an adhesive is sealed in a syringe, and air is introduced into the syringe, whereby the liquid is supplied to the substrate by a predetermined amount from the discharge port of the syringe (Patent Documents 1 and 2). The liquid supply devices of Patent Document 1 and Patent Document 2 include a controller that controls the pressure of air supplied to the syringe, the supply time of air, and the like.

  That is, as shown in FIG. 5, the syringe 100 provided with the discharge port 101 for the liquid L is connected to the dispense controller 103 via a pipe 102 (for example, a length of 1 m and an inner diameter of 3 mm). The dispense controller 103 includes a regulator that sets an appropriate air pressure applied to the syringe 100, an on-off valve, a CPU, and the like. Then, the air pressure and the load time are adjusted by the CPU to control the extrusion amount of the liquid L, and the air is sent to the syringe 100 with the open / close valve opened. Thereby, the liquid L is quantitatively discharged from the syringe for a certain time. Thereafter, the air in the syringe is exhausted at the end of the air supply.

JP 2001-104855 A JP 2010-253376 A

  In a pipe having a length of 1 m and an inner diameter of 3 mm, about 7 cc of air exists. Further, when mounting a small work such as an LED chip, a small syringe 100 in which about 7 cc of liquid is enclosed is often used. For this reason, if the pipe 102 having the dimensions described above is used, air corresponding to one syringe is interposed in the pipe 102. For this reason, a time lag occurs between the push-out command of the dispense controller 103 and the pressure rising on the syringe side, and the rise in the syringe 100 (time from the start of air pressurization until the inside of the syringe reaches the set value) is increased. It becomes dull. Therefore, there is a problem that a delay occurs in the time from the extrusion command until the liquid L is actually supplied from the discharge port 101, and a small amount of coating cannot be controlled.

  When mounting a small work as described above, the time for which the on-off valve in the dispense controller is open is, for example, 20 msec, and pressure is applied in an extremely short time. In this case, a delay in propagation of the piping may cause a delay in the pressure increase of the syringe, and the syringe may fall before the set pressure is reached (air in the syringe is exhausted). Thus, it was difficult to control the inside of the syringe to the set pressure in a very short time.

  Further, in order to prevent a delay in the increase in the pressure of the syringe due to this propagation delay, it is necessary to speed up the time until the internal pressure of the pipe 102 increases. In this case, it is necessary to enlarge the on-off valve built in the dispense controller 103 was there.

  In view of the above problems, the present invention provides a fluid supply device capable of accurately applying a set amount of liquid by preventing a time delay from the start of pressurization until the liquid is pushed out from a discharge port.

The liquid supply device of the present invention includes a syringe from which liquid is discharged from its discharge port, and supplies a pressurized fluid from a fluid supply source to the syringe in an open state to discharge the liquid from the discharge port, and supplies the fluid in a closed state. An on-off valve that stops supply of fluid from the source to the syringe, and the on-off valve can switch between an air supply state that is open and an air exhaust state that is closed, and at least the fluid supply source Is disposed at a position separated from the syringe, and the fluid discharge port of the on- off valve is directly connected to the side opposite to the discharge port of the syringe, and the on-off valve is integrated with the syringe. The internal air pressure rises and the liquid is discharged from the discharge port, and the discharge from the liquid discharge port is stopped by setting the inside of the syringe to a negative pressure state in the air exhaust state of the on-off valve .

  According to the liquid supply apparatus of the present invention, the fluid discharge port of the on-off valve and the counter discharge port side of the syringe are connected. Usually, the on-off valve is built in a dispense controller that is connected to a syringe via a pipe. On the other hand, in the present invention, the on-off valve is connected to the syringe, and by opening the on-off valve, fluid can be supplied to the syringe without piping, and the liquid can be discharged from the discharge port. Can do. Thereby, it is not necessary to consider the rise of the air for the piping, and it is possible to prevent a delay in the pressure increase of the syringe with respect to the extrusion command. In addition, a dispense controller that has been conventionally required is not required.

  The syringe can be moved so that the discharge port corresponds to the liquid supply site, and can be applied to, for example, a die bonder.

  The discharge port may have an inner diameter of 0.1 mm to 2.0 mm.

  Since the liquid supply apparatus of the present invention can prevent a delay in pressure increase with respect to the extrusion command, it prevents the time delay from the start of pressurization until the liquid is pushed out from the discharge port, and accurately applies a set amount of liquid. it can. Furthermore, since it is not necessary to consider the rise of air for the amount of piping, there is an advantage that an on-off valve with a small flow rate can be used. Furthermore, since the dispense controller that has been conventionally required is not required, space can be saved and cost can be reduced.

  When the on-off valve is integrated with the syringe, the syringe and the on-off valve are not connected via a pipe, so that a delay in the pressure increase of the syringe can be prevented with high accuracy.

  When the liquid supply apparatus of the present invention is applied to a die bonder, the accuracy of the amount of adhesive applied can be improved when a chip is bonded to a lead frame, a substrate or the like.

  In a small work such as an LED chip, a discharge port having an inner diameter of about 0.1 mm may be used. Even in such a case, the accuracy of the adhesive application amount can be improved.

It is a fragmentary sectional view of the liquid supply apparatus of this invention. It is a figure which shows the JIS symbol of the on-off valve of the liquid supply apparatus of this invention. It is a top view of the liquid supply apparatus of this invention. It is a pneumatic circuit diagram of the liquid supply apparatus of this invention. It is a simplified diagram showing a conventional liquid supply device.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  This liquid supply apparatus is an apparatus for supplying an adhesive applied on a substrate in order to mount an electronic component such as a semiconductor chip on a circuit board. That is, as shown in FIG. 1, the liquid supply device includes a syringe 1 in which a liquid L as an adhesive such as epoxy or silicon is sealed, and the liquid L is pushed out from the discharge port 53 of the syringe 1 and is not illustrated. It is applied on an adhesion site such as a substrate. In the present embodiment, the syringe 1 is moved by a driving unit (not shown) so that the discharge port 53 is located on the adhesion site.

  As shown in FIG. 1, the liquid supply device includes a syringe 1 in which a liquid L is sealed, and a pneumatic circuit 60 (see FIG. 4) that supplies pressurized fluid (pressurized air in the present embodiment) into the syringe. It has. Then, by supplying air into the syringe through the pneumatic circuit 60, the liquid L is pushed out from the discharge port 53 (the tip of the nozzle 51 described later) by air pressure.

  The syringe 1 includes a cylindrical main body 50 in which the liquid L is sealed on the inner peripheral side, and a nozzle 51 that narrows the flow path of the liquid L downward (supply side) from the lower end of the main body 50. ing. Although simplified in FIG. 1, the nozzle 51 and the main body 50 are separated from each other, and the nozzle 51 is detachably attached to the lower end of the main body 50. The tip portion (lower end portion) of the nozzle 51 is a discharge port 53 serving as an outlet for the liquid L. In addition, as a structure of the syringe 1, the main-body part 50 and the nozzle 51 may be an integral structure. In the present embodiment, the syringe 1 can be filled with 5 cc of liquid L, and the inner diameter D of the discharge port 53 is 0.1 mm to 2.0 mm.

  In the syringe, on the side opposite to the discharge port 53 for the liquid L, a plunger 54 having a conical portion whose diameter is reduced downward is slidably fitted in the longitudinal direction of the syringe. By supplying air to a space 55 formed between the plunger 54 and the block body 21 to be described later, the plunger 54 is pushed down and the liquid L can be pushed out from the discharge port 53.

  The on-off valve (solenoid valve) 2 is provided on the side opposite to the discharge port of the syringe 1. As the on-off valve 2, as shown in FIG. 2, a publicly known three-port type is used. As shown in FIG. 3, a pipe 6 for introducing air from an air supply source (not shown) is attached to the P (supply) port 3, and a weak negative pressure (for example, 0 to 0) is connected to the R (exhaust) port 4. A pipe 7 for applying −5 kPa) is attached. The on-off valve 2 can be used either normally open or normally closed. When supplying the liquid, the P port 3 and the A port 5 are connected, the R port 4 is closed, and air is supplied from the fluid supply source 30 (see FIG. 4) to the space 55 of the syringe 1 via the pipe 6. Thereby, the air pressure in the syringe rises, and the liquid L is discharged from the discharge port 53 when the pressure reaches a predetermined pressure. When stopping the supply of the liquid L, the P port 3 is closed, the A (syringe) port 5 and the R port 4 are connected, and a weak negative pressure (for example, 0 to -5 kPa) is applied. Accordingly, the liquid L can be stopped from being discharged from the discharge port 53, and the liquid L can be sucked to prevent the liquid L from dripping from the discharge port 53.

  As shown in FIG. 1, a block body 21 is attached to the on-off valve 2. The block body 21 is fitted inside the syringe 1 on the side opposite to the discharge port via an O-ring 22, and the on-off valve 2 is fixed integrally with the lid member 20 of the syringe 1. The block body 21 is provided with a hole (not shown) that communicates with the A port 5 of the on-off valve 2. Air can be introduced into the space 55 in the syringe through this hole. An air filter 23 is attached to the block body 21.

  By the way, the on-off valve 2 is provided in the pneumatic circuit 60, so that a dispense controller which has been conventionally required is not required. That is, the on-off valve 2 of the liquid supply apparatus of the present invention is connected to a fluid supply source 30 as shown in FIG. 4, and the fluid supply source 30 is connected to the CPU 32 of the main body apparatus. The fluid supply source 30 includes a compressor, a regulator, and the like, and is controlled so that air is supplied from the compressor and the output voltage and output current to the on-off valve 2 are kept constant by the regulator.

  In the present invention, the fluid discharge port of the on-off valve 2 and the counter discharge port side of the syringe 1 are connected, and by opening the on-off valve 2, fluid can be supplied to the syringe 1 without piping. The liquid L can be discharged from the discharge port 53. Accordingly, it is not necessary to consider the rise of air for the pipe, and a delay in the pressure increase of the syringe 1 with respect to the extrusion command can be prevented. Therefore, the time from the start of pressurization until the liquid L is pushed out from the discharge port 53 A set amount of liquid can be accurately applied while preventing delay. Furthermore, since it is not necessary to consider the rise of the air for the amount of piping, there is an advantage that the on-off valve 2 having a small flow rate can be used. In addition, since the dispense controller that has been conventionally required is not required, space can be saved and costs can be reduced.

  Since the fluid discharge port of the on-off valve 2 is directly connected to the side opposite to the discharge port of the syringe 1 and the on-off valve 2 is integrated with the syringe 1, the syringe 1 and the on-off valve 2 are connected via a pipe. There is nothing. Thereby, the delay of the pressure rise of the syringe 1 can be prevented with high accuracy.

  Since the syringe 1 is moved so that the discharge port 53 is located at a position corresponding to the liquid supply site, for example, when applied to a die bonder, the amount of adhesive applied when the chip is bonded to a lead frame, a substrate, or the like. Accuracy can be improved.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the embodiment, the discharge port 53 is positioned above the liquid supply position. Although the syringe 1 moves as described above, the syringe 1 may be fixed and the liquid supply position side may move.

1 Syringe 2 Pneumatic Circuit 20 Lid Member 53 Discharge Port 60 Pneumatic Circuit D Inner Diameter L Liquid

Claims (3)

The syringe from which the liquid is discharged from the discharge port, and the pressurized fluid from the fluid supply source in the open state are supplied to the syringe to discharge the liquid from the discharge port, and the fluid from the fluid supply source to the syringe in the closed state An on-off valve for stopping supply, and the on-off valve has three ports of a supply port, an exhaust port, and a syringe port, and an air supply source is attached to the supply port via a pipe, Is equipped with a pipe for applying negative pressure, and it is possible to switch between an air supply state that is open and an air exhaust state that is closed,
Disposing at least a fluid supply source at a position spaced from the syringe;
The fluid discharge port of the on-off valve is directly connected to the side opposite to the syringe outlet, the on-off valve is integrated with the syringe , the supply port and the syringe port are connected and the exhaust port is closed in the air supply state of the on-off valve When the air pressure in the syringe rises and liquid is discharged from the discharge port, the exhaust port and the syringe port are connected in the air exhaust state of the on-off valve , the supply port is closed, and the syringe is in a negative pressure state to discharge the liquid Discharge from the liquid supply device is stopped. 2. The liquid supply apparatus according to claim 1, wherein the syringe moves so that the discharge port is located at a position corresponding to the liquid supply site . The liquid supply apparatus according to claim 1 , wherein the discharge port has an inner diameter of 0.1 mm to 2.0 mm .

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