JP2012091141A - Liquid supply device and liquid supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid supply device and a liquid supply method which can accurately apply a set amount of liquid by preventing a time delay from a start of pressurization until the liquid is pushed out from a supply port, and can improve durability.SOLUTION: The liquid supply device includes a syringe 1 having the supply port 51 of the liquid L, and pushes out the liquid L from the supply port 51 by supplying air into the syringe through a pneumatic circuit 2. The pneumatic circuit 2 includes a first air supply part 5 for supplying air at a set pressure to the syringe 1, a second air supply part 6 for supplying air at a higher pressure than the air at the set pressure. The liquid supply device includes a switching means 4 which switches between a normal supply state for loading the air at a predetermined set pressure on the syringe 1, and a high pressure supply state for loading the air at the higher pressure than the set pressure to the syringe 1. In an initial stage, the high pressure supply state is made by the second air supply part 6, and when the pressure reaches the set pressure, the state is switched to the normal supply state by the first air supply part 5.

Description

  The present invention relates to a liquid supply apparatus and a liquid supply method for supplying 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 liquid supply device, and is supplied to a substrate by a predetermined amount from a supply port of the liquid supply device (Patent Document 1).

  The liquid supply apparatus of Patent Document 1 includes a syringe in which liquid is sealed and provided with a liquid supply port. The liquid is pushed out from the supply port by applying air pressure from the dispense controller to the syringe for a certain period of time. . At this time, the air pressure to be loaded is set to an appropriate value (set value), and the amount of liquid extrusion is adjusted by adjusting the loading time.

JP 2001-104855 A

  When the liquid volume in the syringe is decreased by repeating the extrusion of the liquid, the volume of air in the syringe is increased accordingly. When the volume of air increases in this way, the pressure rise is delayed by the volume. That is, if air pressurization is performed when the liquid in the syringe is full, as shown in FIG. 6, the time from the start of air pressurization until reaching a set value (for example, 200 kPa) (hereinafter, rise time) For example) is 0.049 s. On the other hand, when the volume of air in the syringe increases, the water head difference from the full state becomes maximum. If air pressurization is performed at this time, as shown in FIG. 7, the time from the start of air pressurization until the set value is reached is, for example, 0.240 s, and the rise time is longer than the full state. When the rise time becomes long in this way, there may be a delay in the time until the liquid actually comes out with respect to the extrusion command. If such a delay occurs, there is a risk of fading at the initial stage of application or a liquid pool after application, and the set amount cannot be applied accurately. In particular, in a die bonder in which the time required for one cycle is short and the high speed operation is performed, this delay has a large influence on the whole.

  Conventionally, a method for shortening the rise time has been proposed in order to deal with such a problem. That is, when the set pressure is low (for example, 200 kPa), the start-up becomes dull because pressure is applied at a low pressure. For this reason, by using a large volume solenoid valve, the rising time is shortened by pressurizing with a large volume of air. However, when a large capacity solenoid valve is used, the force applied is increased, and the packing of the solenoid valve is worn and easily damaged. As a result, there is a problem in durability of the solenoid valve, and there is a problem that the control becomes complicated.

  In view of the above problems, the present invention can prevent a time lag from the start of pressurization until the liquid is pushed out from the supply port, can accurately apply a set amount of liquid, and can improve durability. A fluid supply apparatus and a liquid supply method are provided.

  The liquid supply apparatus of the present invention includes a syringe in which a liquid is sealed and provided with a liquid supply port. The liquid is extruded from the supply port by air pressure by supplying air into the syringe via a pneumatic circuit. In the liquid supply apparatus, the pneumatic circuit includes a first air supply unit that supplies air at a set pressure to the syringe, and a second air supply unit that supplies air at a pressure higher than the air at the set pressure to the syringe. And a switching means for switching between a normal supply state in which air of a predetermined set pressure is supplied to the syringe and a high pressure supply state in which air higher in pressure than the set air pressure is loaded on the syringe. The high pressure supply state by the second air supply unit is switched to the normal supply state by the first air supply unit when a set pressure or the vicinity thereof is reached.

  According to the liquid supply apparatus of the present invention, the pneumatic circuit includes a first air supply unit that supplies air at a set pressure and a second air supply unit that supplies air at a pressure higher than the set pressure. That is, two or more pressure systems for supplying different air pressures are provided, high pressure air is supplied by the second air supply unit until the set pressure is reached, and when the set pressure or the vicinity thereof is reached, the first air is supplied. The supply unit switches to the supply of set pressure air. As a result, air that is higher than the set pressure can be loaded in the initial stage, so the speed of the syringe pressure rise can be increased, and the time from the start of pressurization until the set value is reached is shortened. be able to.

  Air pressure detecting means for detecting air pressure is provided, and switching from the second air supply section to the first air supply section can be performed based on the air pressure detected by the air pressure detection means. Thereby, the air pressure can be measured.

  When supplying air from the second air supply unit, there is provided setting means for setting a time to reach the set pressure, and at that time, the switching unit is switched from the second air supply unit to the first air supply unit. Can be switched to.

  The setting means can predict the time to reach the set pressure based on the initial pressurizing force.

  The switching unit can switch from the second air supply unit to the first air supply unit immediately before or when the air pressure detected by the air pressure detection unit reaches a set pressure.

  The liquid supply method of the present invention includes a syringe in which a liquid is sealed and provided with a liquid supply port. The liquid is supplied from the supply port at a predetermined set pressure by supplying air into the syringe via a pneumatic circuit. In the liquid supply method for extruding, normal supply for supplying a set pressure to the syringe when the pressure reaches or close to the set pressure after the high pressure air is supplied to the syringe that supplies higher pressure air than the set pressure air. It is a state.

  According to the liquid supply method of the present invention, high-pressure air is supplied by the second air supply unit until the set pressure is reached, and when the set pressure or the vicinity thereof is reached, the set pressure is supplied by the first air supply unit. Switch to. As a result, air that is higher than the set pressure can be loaded in the initial stage, so the speed of the syringe pressure rise can be increased, and the time from the start of pressurization until the set value is reached is shortened. be able to.

  Since the liquid supply device and the liquid supply method of the present invention can shorten the time from the start of pressurization until reaching the set value, even if the volume of the liquid in the syringe decreases and the proportion of air increases The time delay from the start of pressurization until the liquid is pushed out from the supply port can be suppressed, and a predetermined amount of liquid can be applied accurately. In addition, since at least two systems of pressurization are used, a solenoid valve smaller than the solenoid valve used in one system can be used, the driving force can be reduced, and it is hard to be damaged and has excellent durability. Furthermore, the pressure control only has to switch one of the systems, and there is an advantage that it is simpler than the pressure control of one system.

  When air pressure detecting means for detecting the air pressure is provided, the air pressure can be measured and the switching timing can be made accurate.

  The setting means predicts the time to reach the set pressure based on the initial pressure, and if the switching means switches from the second air supply unit to the first air supply unit at that time, the switching is automatically performed. And can be controlled with high accuracy.

  If the switching means switches from the second air supply unit to the first air supply unit immediately before or when the air pressure reaches the set pressure, the apparatus can be configured in a simple manner.

It is a principal part of the pneumatic circuit diagram of the liquid supply apparatus of this invention. It is a block diagram of the liquid supply apparatus of this invention. It is a flowchart figure which shows the method of apply | coating a liquid with the liquid supply method of this invention. It is a principal part of the pneumatic circuit diagram which shows the method of supplying air to the syringe of the liquid supply apparatus of this invention. It is a graph which shows the relationship between the time in the syringe of the liquid supply apparatus of this invention, and a pressure, and a time chart which shows a pressurization timing. In the conventional liquid supply apparatus, it is a graph which shows the relationship between the air pressure at the time of supplying air in a liquid full state, and time. In the conventional liquid supply apparatus, it is a graph which shows the relationship between the air pressure at the time of supplying air in a liquid empty state, and time.

  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, the liquid L is pushed out from the supply port 51 of the syringe 1 in which the liquid L as an adhesive such as epoxy or silicon is sealed, and applied onto an adhesion site such as a substrate (not shown). .

  As shown in FIG. 1, the liquid supply apparatus includes a syringe 1 in which a liquid L is sealed, a supply port 51 provided in the syringe 1 and serving as an outlet for the liquid L, and a pneumatic circuit for supplying air into the syringe. 2 and air pressure detecting means 3 (see FIG. 2) for detecting the air pressure in the syringe. Then, the liquid L is pushed out from the supply port 51 by air pressure by supplying air into the syringe through the pneumatic circuit 2.

  The syringe 1 has a cylindrical shape, and the liquid L is sealed on the inner peripheral side thereof. A nozzle serving as a supply port 51 is attached to the distal end portion of the syringe 1.

  The air pressure detection means 3 is a publicly known air pressure sensor attached to the side opposite to the supply port in the syringe 1 in this embodiment. The air pressure detection means 3 detects the internal pressure of the syringe 1 and transmits the detected pressure as a radio wave signal.

  The pneumatic circuit 2 includes a first air supply unit 5, a second air supply unit 6, a slight negative pressure supply unit 7, an exhaust unit 8, a switching unit 4 (see FIG. 2), and a setting unit 10 (see FIG. 2). ). The pneumatic circuit 2 is connected to the syringe 1, and a first air supply unit 5, a second air supply unit 6, a slight negative pressure supply unit 7, and an exhaust unit 8 are connected from the branching unit 11.

  An appropriate (for example, 200 kPa) air pressure (set pressure) is set in advance to supply the liquid L from the syringe 1, and the first air supply unit 5 applies a set pressure to the syringe 1 from an air generation source (not shown). It is a solenoid valve that supplies air. The second air supply unit 6 is an electromagnetic valve for supplying air having a pressure (for example, 500 kPa) higher than the set pressure air from an air generation source (not shown). The slight negative pressure supply unit 7 is an electromagnetic valve for supplying a slight negative pressure to the syringe 1, and the exhaust unit 8 is an electromagnetic valve for rapidly setting the inside of the syringe to atmospheric pressure.

  The switching means 4 switches between a normal supply state in which air at a set pressure is supplied to the syringe 1 and a high pressure supply state in which air at a pressure higher than the set pressure is supplied to the syringe 1. That is, when the set pressure or the vicinity thereof is reached as the high pressure supply state by the second air supply unit 6 in the initial stage, the normal supply state by the first air supply unit 5 is switched.

  The setting means 10 predicts the time to reach the set pressure based on the initial pressure detected by the air pressure detection means 3 when supplying high-pressure air from the second air supply unit 6. is there. That is, at the initial stage where air is supplied from the second air supply unit 6, the air pressure detecting means 3 can instantaneously measure the air pressure increasing speed in the syringe. The predicted time for the syringe to reach 200 kPa can be determined from the air pressure increase rate. Then, the setting means 10 sends this predicted time to the switching means 4, and at that time, the switching means 4 switches from the second air supply unit 6 to the first air supply unit 5.

  Next, a method for supplying a liquid to a substrate (not shown) using the liquid supply apparatus of the present invention will be described with reference to FIGS. In FIG. 4, the four valves shown in FIG. 1 are simplified. In this embodiment, an appropriate set pressure is set to 200 kPa in advance for supplying the liquid L from the syringe 1. It is assumed that an air pressure of 200 kPa is supplied from the first air supply unit 5 and an air pressure of 500 kPa is supplied from the second air supply unit 6.

  First, as shown in FIG. 4A, the slight negative pressure supply unit 7 is opened, the first air supply unit 5, the second air supply unit 6, and the exhaust unit 8 are closed, and the cylinder is closed. A slight negative pressure is supplied inside (step S1). This is to prevent the liquid from dripping from the supply port 51 by its own weight. Thereafter, as shown in FIG. 4B, the slight negative pressure supply unit 7 is closed, the second air supply unit 6 is opened, and 500 kPa of air is supplied to the syringe 1 (step S2). In this way, since a pressure larger than the set pressure can be applied in the initial stage, the pressure increase speed of the syringe 1 can be increased as shown in FIG. At this time, the air pressure detection means 3 detects the internal pressure of the syringe 1 and transmits the detected pressure to the setting means 10 as a radio wave signal. Thereby, the setting means 10 calculates the pressurization speed (inclination of the graph of FIG. 5), predicts the time t when the syringe 1 reaches the set pressure (200 kPa) based on this (step S3), and switches this. Send to means 4.

  When 500 kPa of air is supplied for time t, the syringe 1 reaches the set pressure or in the vicinity thereof as shown in FIG. 5, and the switching means 4 includes the second air supply section 6 as shown in FIG. 4 (c). Is closed, and the first air supply unit 5 is opened to switch to the normal supply state by the first air supply unit 5. Then, air at a set pressure is supplied until a predetermined amount of the liquid L is supplied (step S4).

  By the way, after supplying the air pressure into the syringe, the liquid L can be cut well by immediately releasing the inside of the syringe to the atmospheric pressure. Therefore, when a predetermined amount of the liquid L is supplied, the first air supply unit 5 is closed and the exhaust unit 8 is opened as shown in FIG. (Step S5). Thereby, the cutting | disconnection of the liquid L can be improved and the liquid L can be apply | coated correctly predetermined amount. In addition to the case where the first air supply unit 5 and the second air supply unit 6 are pressurized as in the present embodiment, only the first air supply unit 5 is provided as in the conventional case (that is, from the high pressure). Even in the pressurizing method (without switching to the set pressure), the liquid L can be cut well by rapidly setting the inside of the syringe to atmospheric pressure.

  In the present invention, the pneumatic circuit 2 includes a first air supply unit 5 that supplies air having a set pressure, and a second air supply unit 6 that supplies air having a pressure higher than the set pressure. That is, two or more pressure systems for supplying different air pressures are provided, high pressure air is supplied by the second air supply unit 6 until the set pressure is reached, and the first pressure is reached when the set pressure or the vicinity thereof is reached. The air supply unit 5 switches to supply of set pressure air. As a result, air having a pressure higher than the set pressure can be loaded at the initial stage, so that the pressure increase speed of the syringe 1 can be increased, and the time from the start of pressurization to the set value being shortened. can do. Therefore, even if the volume of the liquid in the syringe is reduced and the proportion of air is increased, the time delay from the start of pressurization until the liquid is pushed out from the supply port 51 can be suppressed. Can be applied. In addition, since at least two systems of pressurization are used, a solenoid valve smaller than the solenoid valve used in one system can be used, the driving force can be reduced, and it is hard to be damaged and has excellent durability. Furthermore, the pressure control only has to switch one of the systems, and there is an advantage that it is simpler than the pressure control of one system.

  Air pressure detecting means 3 for detecting air pressure is provided, and switching from the second air supply section 6 to the first air supply section 5 is performed based on the air pressure detected by the air pressure detection means 3. . Thereby, the air pressure in the syringe can be measured and the switching timing can be made accurate.

  When supplying pressurized air from the second air supply unit 6, it is provided with setting means 10 for predicting the time to reach the set pressure based on the initial pressurizing force, at which time the switching means 4 is the second air supply unit 6 is switched to the first air supply unit 5. Thereby, switching can be performed automatically and control can be performed with high accuracy.

  As another embodiment, the timing at which the switching unit 4 switches from the first air supply unit 5 to the second air supply unit 6 is determined from the set pressure, the experience value of the pressurization speed based on the size of the syringe 1, or the like. It is possible to predict the time to reach up to and store the time in the setting means 10 for switching.

  As still another embodiment, the timing at which the switching unit 4 switches from the first air supply unit 5 to the second air supply unit 6 is the air detected by the air pressure detection unit 3 without setting the time. It is switched immediately before or when the pressure reaches the set pressure. In this way, it is not necessary to provide the setting means 10, and the apparatus can be made simple.

  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, the position of the air pressure detecting means 3 is not limited to the position of the embodiment. The location is arbitrary, such as being provided at the supply port 51. The set pressure pressurized by the first air supply unit 5 and the air pressure pressurized by the second air supply unit 6 are arbitrary. In the embodiment, the pressurization of the two systems of the first air supply unit 5 and the second air supply unit 6 is performed, but the pressurization is performed by three or more systems of the third air supply unit, the fourth air supply unit,. There may be. The slight negative pressure supply unit 7 and the exhaust unit 8 may be omitted.

DESCRIPTION OF SYMBOLS 1 Syringe 2 Pneumatic circuit 3 Air pressure detection means 4 Switching means 5 1st air supply part 6 2nd air supply part 10 Setting means 51 Supply port L Liquid

Claims (6)

In a liquid supply apparatus that includes a syringe in which a liquid is sealed and provided with a liquid supply port, and pushes the liquid from the supply port with air pressure by supplying air into the syringe through a pneumatic circuit.
The pneumatic circuit includes a first air supply unit that supplies air of a set pressure to the syringe, and a second air supply unit that supplies air of higher pressure than the air of the set pressure to the syringe,
A switching means for switching between a normal supply state in which air of a predetermined set pressure is loaded on the syringe and a high pressure supply state in which air higher in pressure than the set air pressure is loaded on the syringe;
The liquid supply apparatus according to claim 1, wherein when the set pressure or the vicinity thereof is reached as a high pressure supply state by the second air supply unit in an initial stage, the liquid supply device is switched to a normal supply state by the first air supply unit.   An air pressure detection means for detecting an air pressure is provided, and switching from the second air supply section to the first air supply section is performed based on the air pressure detected by the air pressure detection means. Item 2. The liquid supply apparatus according to Item 1.   When supplying air from the second air supply unit, there is provided setting means for setting a time to reach the set pressure, and at that time, the switching unit is switched from the second air supply unit to the first air supply unit. The liquid supply device according to claim 1 or 2, wherein the liquid supply device is switched to.   4. The liquid supply apparatus according to claim 3, wherein the setting means predicts a time required to reach the set pressure based on an initial pressurizing force.   The switching unit switches from the second air supply unit to the first air supply unit immediately before or when the air pressure detected by the air pressure detection unit reaches a set pressure. Item 3. A liquid supply apparatus according to item 1 or 2. In a liquid supply method comprising a syringe in which liquid is enclosed and provided with a liquid supply port, and extruding liquid from the supply port at a predetermined set pressure by supplying air into the syringe via a pneumatic circuit,
After a high pressure supply state in which the syringe is loaded with higher pressure air than the set pressure air,
A liquid supply method, wherein a normal supply state in which a set pressure is applied to the syringe when a set pressure or a vicinity thereof is reached.

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