JPH0331105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus that can always optimally control the amount of adhesive applied when temporarily fixing chip parts to a substrate.

<Prior Art> When applying an adhesive for temporarily fixing chip parts to a substrate, a dispenser is often used which applies positive pressure inside a syringe to push out the adhesive. When using this dispenser, the adhesive can be replenished by replacing the syringe filled with the adhesive using a cartridge method, which has the advantage of simplifying management work.

By the way, in a device that applies positive pressure primarily to the inside of the syringe, when the amount of adhesive remaining in the syringe decreases, the air space that expands as the amount of adhesive decreases acts as a damper. As a result, there is a problem that the discharge amount decreases.

Therefore, conventionally, an opening signal for a solenoid valve that controls the pressure application time is applied to an adder, and the remaining amount of adhesive in the syringe is indirectly determined from the value displayed by this adder. The remaining amount of adhesive is estimated empirically and a pressure application switch using a digital switch or the like is manually adjusted to prevent excess or deficiency of the applied amount.

<Problems to be Solved by the Invention> However, in the case where manual adjustments are made by an operator as described above, human monitoring is required even when automatically operating an adhesive applicator, for example. It is not possible to reduce man-hours, and chip parts may shift or fall due to insufficient coating amount due to incorrect switch adjustment, or
There was a problem in that excessive coating amount caused soldering defects, which adversely affected quality.

The present invention has been made to solve these conventional problems, and provides a control device that can apply a predetermined amount of adhesive without excess or deficiency, regardless of the remaining amount of adhesive (number of applications). The purpose is to improve the reliability of coating equipment.

<Means for Solving the Problems> In order to achieve the above object, the present invention supplies positive air pressure through the electromagnetic valve into the syringe filled with adhesive, thereby responding to the opening time of the electromagnetic valve. an adhesive coating device configured to dispense and apply an amount of adhesive from a syringe onto a substrate; A memory that stores the opening time of the electromagnetic valve in relation to the number of times the adhesive is applied, and the opening time of the electromagnetic valve is calculated from the stored contents of the memory based on the number of times of application accumulated by the pulse counter, and the opening time of the electromagnetic valve is corresponding to the opening time. The adhesive comprises: an arithmetic processing device that outputs an opening time control signal; and a controller that controls application time of the opening signal supplied to the electromagnetic valve based on the opening time control signal output from the arithmetic processing device. It constitutes a coating device.

<Function> With this configuration, the application time of the positive air pressure supplied into the syringe (the opening time of the electromagnetic valve) can be automatically adjusted according to the actual application amount (the amount of adhesive remaining in the syringe). This is corrected to ensure that just the right amount of adhesive is discharged.

<Example> An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of essential parts showing an embodiment of an adhesive applicator according to the present invention. An electromagnetic valve 5 is interposed in the middle of the air passage 4 that connects it to an air tank (not shown), and positive air pressure is applied to the inside of the syringe 3 via the electromagnetic valve 5.

An open time timing signal is supplied at predetermined intervals from a control section of the applicator main body (not shown) to the controller 7, which supplies a drive signal to the switching element 6 that opens and closes the energizing circuit of the electromagnetic valve 5. The width of the drive pulse applied to the switching element 6 (opening time of the electromagnetic valve 5) is controlled based on the timing signal and an opening time control signal output from an arithmetic processing unit 8, which will be described later. Further, a pulse counter 9 is connected to the output terminal of the controller 7.
By connecting the input end of the syringe 3, an integrated signal of the number of applications corresponding to the amount of adhesive consumed from the time when the syringe 3 is replaced to that time is supplied to the arithmetic processing unit 8.

The arithmetic processing unit 8 is connected to a memory 10 that stores in advance an optimal map of the cumulative number of applications versus the electromagnetic valve opening time (pressure application time), and calculates the map based on the cumulative signal output from the pulse counter 9. Calculate the optimal basic opening time. A temperature sensor 11 detects the internal temperature of the syringe 3.
After correcting the optimum basic opening time based on the output of , a signal corresponding to the corrected optimum opening time is supplied to the controller 7 as an opening time control signal. 12 is a reset switch for the pulse counter 9.

In the above configuration, when the coating device is operated, the integrated value of the number of coatings at that time is supplied to the arithmetic processing device 8. The arithmetic processing unit 8 reads the optimum basic opening time from the memory 10 based on the integrated value supplied from the pulse counter 9, corrects the optimum basic opening time based on the temperature signal output from the temperature sensor 11, and obtains the optimum basic opening time. The controller 7 outputs an open time control signal responsive to the optimum open time, and at the time the open time timing signal is supplied, a drive signal having a pulse width responsive to the open time control signal is supplied from the controller 7 to the switching element 6.

Further, the electromagnetic valve 5 is opened when the switching element 6 is on, and applies positive air pressure supplied from an air tank (not shown) to the syringe 3. Therefore, when positive air pressure is applied via the electromagnetic valve 5, the internal pressure of the syringe 3 increases and the adhesive is forcibly extruded and applied onto the substrate 2.

On the other hand, as shown in FIG. 2, the memory stores map data in which the application time is gradually increased as the number of times of application (integrated value) increases. Therefore, even if the number of applications increases and the volume of the air chamber inside the syringe 3 increases, the pulse width of the drive signal output from the controller 7 increases, the opening time of the electromagnetic valve 5 becomes longer, and the syringe 3 The application time of positive pressure becomes longer. Therefore, even if the number of applications increases and the remaining amount of adhesive decreases, and the volume of the air chamber increases accordingly, the application time of positive pressure will be extended by an amount corresponding to this increase in volume. Therefore, a predetermined amount of adhesive is always discharged (applied).

Generally, as the temperature rises, the viscosity of the adhesive decreases and the amount of application (discharge amount) tends to increase. Therefore, in order to prevent variations in the application amount due to such temperature changes, a temperature sensor 11 is provided to detect the temperature inside the syringe 3 (adhesive temperature) as shown in the embodiment. By correcting the opening time control signal supplied to the controller 7 in accordance with the output of the controller 11, it is desirable to improve the control accuracy of the coating amount. Furthermore, if the amount of adhesive applied is changed, or if the specifications of the adhesive are changed, the map data may be changed accordingly.

<Effects of the Invention> As explained above, according to the present invention, as the number of adhesive applications increases, the opening time of the electromagnetic valve is automatically lengthened to lengthen the application time of positive air pressure. Because of this, even if the remaining amount of adhesive decreases and the volume of the air chamber inside the syringe increases, a predetermined amount of adhesive is always discharged, so the amount applied to the substrate can be maintained at a predetermined value. Can be done.
In addition, since there is no need for manual adjustment work as in the past, it is possible to prevent quality deterioration due to adjustment errors.Furthermore, there is no need to manually monitor the coating equipment, so automatic operation can save labor. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an embodiment of an adhesive coating apparatus according to the present invention, and FIG. 2 is a data map stored in the memory. 2... Board, 3... Syringe, 4... Air passage, 5... Solenoid valve, 6... Switching element, 7... Controller, 8... Arithmetic processing unit,
9...Pulse counter, 10...Memory, 11...
...Temperature sensor, 12...Reset switch.

Claims (1)

[Claims] 1. By supplying positive air pressure into a syringe filled with adhesive via a solenoid valve, an amount of adhesive corresponding to the opening time of the solenoid valve is discharged from inside the syringe onto a substrate. The adhesive applicator is configured to apply an adhesive using a pulse counter that adds up the number of applications by adding open signals applied to the electromagnetic valve, and a pulse counter that stores the opening time of the electromagnetic valve corresponding to the number of times the adhesive is applied. a memory, an arithmetic processing device that calculates an opening time of the electromagnetic valve from the memory contents of the memory based on the number of applications accumulated by the pulse counter, and outputs an opening time control signal corresponding to the opening time; An adhesive application device comprising: a controller that controls an application time of an opening signal supplied to the electromagnetic valve based on an opening time control signal output from a processing device. 2. The adhesive according to claim 1, wherein the arithmetic processing device has a temperature correction function that increases or decreases the opening time control signal supplied to the controller according to the temperature inside the syringe. Agent applicator.