JPH0744331B2 - Coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a coating apparatus for coating a coating agent used for fixing a chip-shaped electronic component on a printed circuit board.

(B) Conventional Technology In the conventional coating device, the coating material in the syringe is coated on the printed circuit board by applying the air pressure from the pressure supply source in the syringe.

Further, as disclosed in JP-A-62-176571, the temperature of a viscous substance (phase in the syringe, etc.) of a cylinder container (phase in the coating agent, etc.) is detected by a temperature detecting means,
There is a technique in which a set amount of a viscous substance is constantly discharged by automatically adjusting the set pressure of the automatic pressure regulating valve according to the temperature change.

However, depending on the amount of the coating material in the syringe, the amount of the coating material to be discharged was erratic even when the pressure corresponding to the temperature change was applied. That is, even if the pressure from the pressure supply source is constant, the above phenomenon occurs due to the effect of the weight due to the difference in the remaining amount of the coating agent.

(C) Problem to be Solved by the Invention It is always to make the discharge amount of the coating agent constant.

(D) Means for Solving the Problems Therefore, the present invention provides a coating device for coating a coating material used for fixing a chip-shaped electronic component on a printed circuit board by controlling the opening / closing of a pressure supply valve. A first storage unit that stores relational data of the number of dischargeable times with respect to the remaining amount of the coating agent, a second storage unit that stores relational data of the discharge amount with respect to the number of discharges, and a third storage unit that stores the standard discharge amount. And the storage means for calculating the already ejected number from the relational data stored in the first memory means based on the remaining amount of the coating agent, and stored in the second memory means based on the already ejected number. A comparison means for calculating an expected ejection amount expected to be ejected next time from the related data, and a comparison for comparing the expected ejection amount calculated by the calculation means with the standard ejection amount stored in the third storage means. Means and In which the discharge amount of the next on the basis of the comparison result by said comparing means is provided and a control device for controlling the pressure supply valve such that the standard ejection amount.

(E) Operation With the above configuration, the calculating means calculates the number of times of previous ejection from the relational data stored in the first storage means based on the remaining amount of the coating agent in the syringe, and also calculates the number of times of previous ejection based on the number of previous ejections. The expected ejection amount for the next ejection is calculated from the relational data stored in the second storage means. Then, the comparison means compares the estimated discharge amount with the third discharge amount.
The standard discharge amount stored in the storage means is compared, and based on the comparison result, the control device controls the pressure supply valve so that the next discharge amount becomes the standard discharge amount.

(F) Example One example of the present invention will be described in detail below with reference to FIGS. 1 to 10.

(1) can be moved in the XY direction, that is, in the horizontal and vertical directions by the X-direction drive motor (2) and Y-direction drive motor (3)
On the XY table, two printed circuit boards (4) and (5) are placed on the table (1) at a predetermined interval.

(6), (7), (8), and (9) are the first, second, third, and fourth coating nozzles located above the XY table (1), and the first and third nozzles (6) and (8). Is a small diameter nozzle, and the second and fourth nozzles (7) and (9) are large diameter nozzles. (1
0, (11), (12) and (13) are syringes filled with an adhesive as a coating agent, and these syringes (10) (11) (12)
(13) is a cam lever (22) (23) of the first, second, third, and fourth via roller receivers (14) (15) (16) (17) and rollers (18) (19) (20) (21). ) (24) (25).

(26) (27) are these cam levers (22) (23) (24)
It is a fulcrum shaft provided at the other end of (25).

Reference numerals (28) and (29) are cams whose circular arc diameter changes for each semicircle. One cam (28) is a cam follower (30) (31)
While holding the first and second cam levers (22) and (23) respectively, the other cam (29) is connected to the cam follower (32).
Third and fourth cam levers (24) and (25) via (33)
Holding

The stopper levers (34) (35) (36) (37) are respectively the first, second, third, fourth cam levers (22) (23) (24) (2).
The cam lever (22), (23), (24), and (25) is arranged at an intermediate position between the contact portion between the nozzle support portion and the cam in (5) so that each cam lever (22) (23) (24) (25) can be held individually.

Reference numeral (38) denotes a pulse motor which is rotated by a motor drive circuit (38A) serving as a drive source for the cams (28) (29), and which includes a drive shaft (41) via a clutch brake unit (39) and a speed reducer (40). ) To give a rotational force.

Then, the rotation of the motor (38) causes the cams (28) (2
9) rotate simultaneously, but solenoids (42) (43) (4
4) If all (45) are not excited, the spring (46)
All stopper levers (34) (35) (36) (37) are cam levers (22) (23) due to the urging force of (47) (48) (49).
Holds (24) and (25).

When the small diameter nozzles (6) and (8) are selected here, the solenoids (42) and (44) are excited as shown in FIG. 5 and resist the springs (46) and (48) against the stopper lever (34). ) (36) releases the holding of the first and third cam levers (22) and (24), and the small diameter parts of the cams (28) and (29) move to the cam follower (30).
The nozzles (6) and (8) are brought close to the printed circuit boards (4) and (5) at the timing of being located at (32), and the adhesive is supplied. Change the position of the printed circuit board (4) (5) by changing the cam (2
8) (29) Each nozzle (6) (7) (8) by the large diameter part
This is done by horizontally moving the XY table (1) when (9) is pulled up.

At this time, the pressure inside the syringes (10), (11), (12) and (13) is increased to increase the pressure in the nozzles (6) (7) (8) (9).
Supply of adhesive to the tip, solenoid (42) (43) (4
4) (45) stopper levers (34) (35) (36) (3
Also perform the switching operation in 7).

(50) ... is a line sensor that constantly detects the amount of adhesive in the syringes (10), (11), (12) and (13), and is installed in the syringes (10) (11) (12) (13). Float (5
1) Detect the position of ... to detect the remaining amount of adhesive.

(52) is a keyboard (53) as an input device for setting various data, and screen selection keys (5
5) An operation unit composed of a start key (56) for starting the coating device, which produces various data by operating each key of the keyboard (53).

Reference numeral (57) denotes a CPU as a control device, which responds to each key operation and performs given control relating to various data settings and control relating to a coating operation based on various information.

(58) is a RAM as a storage means for storing various setting data set by the keyboard (53).

Reference numeral (59) is a ROM that stores a program related to the coating operation.

(60) is an air valve as a pressure supply valve that sends air from an air source (61) as a pressure supply source to the syringe (10), and the pressurizing time or the pressurizing force is changed by a command from the CPU (57). It

(62) is an interface.

(63) is a discharge start timing sensor, which receives the discharge start signal output from the sensor (63),
U (57) causes the coating device to perform a discharging operation.

The operation will be described in detail below with reference to the drawings.

FIG. 6 is a graph showing the relationship between the total amount of discharge and the amount of adhesive remaining in the syringe (10) during a series of coating operations. This relational data is stored in a predetermined area in the RAM (58).

First, when the start key (56) of the operation unit (52) is pressed, the coating device starts the coating operation according to the flowchart shown in FIG. 7 under the control of the CPU (57). Then, according to the coating data shown in FIG. 8, that is, the discharge ports (not shown) of the coating nozzles (6) and (8) selected at the _first coating position (X ₁ , Y ₁ ) based on the contents of the nozzle selection data. ) Moves the XY table (1) so that XY comes. Here, the selection by the content of the nozzle selection data is selected by "0" and "1" shown in FIG. That is, the small diameter nozzles (6) and (8) are used in the case of "0", and the large diameter nozzles (7) and (9) are used in the case of "1".

When the position setting is completed, the pulse motor (38) as a drive source is rotated by the motor drive circuit (38A) to rotate the cams (28) (29). A coating head (not shown) moves up and down in response to the rotation of the cams (28) (29). At this time, the cam (28) (29) is rotated by the rotation of the pulse motor (38).
Rotate at the same time, but this time the small diameter nozzle (6)
When (8) is selected, as shown in FIG. 5, the solenoids (42) and (44) are excited to resist the springs (46) and (48) by the stopper levers (34) and (36). When the third cam levers (22) and (24) are released, and the small diameter portions of the cams (28) and (29) are positioned on the cam followers (30) and (32), the nozzles (6) and (8) move to the printed circuit board ( 4) Adhesive is supplied near (5).

The following operations are performed when the adhesive is supplied. That is, the remaining amount of adhesive in the syringe (10) is measured by the line sensor (50).
The discharge number up to that time is detected by the CPU (5
Calculated by the calculation means (not shown) in 7), and the result is RAM
It is stored in a predetermined area in (58) and is displayed on the screen of the monitor television (54).

Then, based on the relationship data of the relationship diagram of the discharge amount with respect to the total discharge number stored in the RAM (58) shown in FIG. 9 from the discharge number, the expected discharge amount at the next discharge is calculated by the calculating means. Then, when the expected discharge amount becomes smaller than the standard discharge amount by the comparison means (not shown), the rate of increase correction of the pressurization time or the applied pressure is calculated by the calculation means (not shown) in the CPU (57). It is calculated from the following formula.

Further, when the discharge amount becomes larger than the standard discharge amount, the rate of pressurization time or the correction correction of the applied pressure is calculated by the following equation.

In addition, X ₍₁₎ and X ₍₂₎ in the above two equations respectively represent the standard pressurization time or pressure, and the corrected pressurization time or pressure.

Further, when the discharge amount is the same as the standard discharge amount, the set pressurizing time or the set pressurizing force is maintained.

For example, when (A) shown in FIG. 1 is used as the remaining amount of adhesive in the syringe (10), the number of discharges up to that time is obtained based on the relational data shown in FIG. 6 (FIG. 6 (A ′)). ), The expected ejection amount for the next ejection is calculated from the ejection number (A ′) based on the relational data in FIG. 9 (FIG. 9 (A ″)), and the value (A ″) is the standard ejection amount (B). ″), The increase correction is performed using the equation (I), and each component stored in the RAM (58) of FIG. 10 is added to the calculated pressurizing time or pressurizing force. Based on the data indicating the standard discharge amount for (1), the optimum amount of adhesive is discharged by applying pressure to the syringe (10) for the time or pressure obtained by multiplying the pressurizing time or pressure by the standard discharge amount. Since the standard discharge amount of the first part is "1" from Fig. 10, the corrected pressurizing time or pressure should be adjusted as it is. It's fine. The tenth
In the figure, “1” indicates the standard discharge amount, and “2” indicates twice the standard discharge amount. The same applies hereinafter.

Hereinafter, this operation is sequentially repeated to complete the application of the optimum amount of adhesive. At this time, the number of ejections is sequentially subtracted from the content of the total number of ejections. That is, standard discharge rate "1"
In the case of 1, the total number of ejections is subtracted from "-1", and in the case of "2", "-2" is subtracted. The same applies hereinafter. Then, when the subtraction from the total number of discharges continues and reaches a certain set number of discharges,
The adhesive is automatically replenished in the syringe (10), the operator is informed to replenish the adhesive, and the application device is stopped.

The method for detecting the remaining amount of the adhesive in the syringe (10) is not limited to this embodiment, and for example, after the ultrasonic waves transmitted from the sensor propagate in the air and reach the liquid surface, The remaining amount of the adhesive may be recognized by converting the distance from the sensor to the liquid surface from the time until it returns to the sensor.

Also, the remaining amount of adhesive in the syringe (10) can be detected by measuring the air flow rate during decompression, measuring the decompression time, measuring the weight of the syringe, measuring the volume of the adhesive in the syringe, etc. It may be done.

In addition, make sure that the syringe (1
The line sensor (50) can be omitted if the adhesive in (0) is filled up. That is, it is possible to recognize the number of ejections up to that time by sequentially subtracting from the total number of ejections at the time of fullness.

(G) Effect of the Invention With the above configuration, regardless of the remaining amount in the syringe,
The optimum amount of adhesive can always be discharged.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a coating apparatus to which an embodiment of the present invention is applied, FIGS. 2 and 3 are perspective views and a plan view showing the coating mechanism, and FIGS. 4 and 5 are operation states of a cam lever. FIG. 6, FIG. 6 is a relationship diagram of the total number of discharges with respect to the remaining amount of the adhesive, FIG. 7 is a flowchart showing a coating operation, FIG. 8 is a diagram showing a program relating to the coating operation, and FIG. Shows the relationship of the discharge amount with respect to the total number of discharges, and FIG. 10 shows the standard discharge amount for each component. (10) (11) (12) (13) …… syringe, (50) …… line sensor, (57) …… CPU, (58) …… RAM, (60)
…… Air valve, (61) …… Air source, (63) …… Discharge start timing sensor.

Claims (1)

[Claims] 1. A coating apparatus for coating a coating material used for fixing a chip-shaped electronic component on a printed circuit board by controlling the opening and closing of a pressure supply valve, wherein A first storage means for storing the relational data, a second storage means for storing the relational data of the ejection amount with respect to the number of ejections, and a third storage means for storing the standard ejection amount.
And the storage means for calculating the already ejected number from the relational data stored in the first memory means based on the remaining amount of the coating agent, and stored in the second memory means based on the already ejected number. A comparison means for calculating an expected ejection amount expected to be ejected next time from the related data, and a comparison for comparing the expected ejection amount calculated by the calculation means with the standard ejection amount stored in the third storage means. And a control device that controls the pressure supply valve so that the next discharge amount becomes the standard discharge amount based on the comparison result by the comparison device.