JP3689551B2 - Viscous fluid application device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a viscous fluid application apparatus that applies viscous fluid to a substrate.
[0002]
[Prior art]
An example of this type of viscous fluid coating apparatus will be described with reference to FIG.
[0003]
In FIG. 1, 1 is a viscous fluid such as an adhesive, 2 is a printed circuit board on which the viscous fluid 1 is applied to an application point, 3 is a table unit for moving and positioning the printed circuit board 2, and 4 is a table unit 3 in the Y-axis direction. A Y robot for moving and positioning, 5 is a dispenser (application head) having a nozzle portion 11 for applying viscous fluid 1, 6 is an application valve, 7 is a recognition camera for recognizing the area of the applied viscous fluid 1, and 8 is An X robot for moving and positioning the coating head 5 and the recognition camera 7 in the X-axis direction, 9 is a test hitting tape used for test hitting mounted on the table unit 3, and 10 is for arbitrarily controlling each of the above-mentioned mechanism units It is a control unit that can.
[0004]
Next, the timing of the coating operation of the conventional viscous fluid coating apparatus will be described.
[0005]
FIGS. 4A and 4B are timing charts created to represent the conventional application timing controlled by the control unit 10, and the solid line shows the speed control state of the vertical movement of the application head 5 and the broken line. Indicates the speed control state of movement of the coating head 5 in the X-axis direction. In the figure, (11) shows the speed state when the coating head 5 is lowered, (12) shows the speed state when the coating head 5 is raised, and (13) shows the Y of the substrate 2 driven by the Y robot 4. The speed state of the movement of the coating head 5 in the X-axis direction by driving the X robot 8 determined in consideration of the movement in the axial direction is shown, and the integral value indicates the movement distance of the coating head 5 between the coating points. ing.
[0006]
FIG. 4A is a timing chart when the movement distance s of the coating head 5 between the coating points. FIG. 4B is a timing chart when the movement distance of the coating head 5 between the coating points is larger than s. It is a timing chart when it is S.
[0007]
4 (a) and 4 (b), (14) shows the timing when the application valve 6 opens when the viscous fluid 1 is discharged to the tip of the nozzle portion 11 of the application head 5. Further, (15) shows a time point when the viscous fluid is applied from the nozzle portion 11 of the coating head 5 to the coating point of the substrate 2 when the coating head 5 is lowered and is at the bottom dead center position.
[0008]
(16) shows the time required from the time when the coating valve 6 is opened to the time (15) when the viscous fluid is applied, which varies depending on the moving distance of the coating head 5 as shown in FIGS. 4 (a) and 4 (b). In FIG. 4A, it takes t, and in FIG. 4B, it takes T larger than t.
[0009]
[Problems to be solved by the invention]
By the way, in the application process of the viscous fluid application device, it is required to apply the viscous fluid without variation in the application amount.
[0010]
However, in the conventional viscous fluid application apparatus as described above, as shown in FIGS. 4A and 4B, the application valve varies depending on the moving distances s and S of the application head 5 between application points of the viscous fluid. The time t and T required to apply and transfer the viscous fluid after opening 6 changes, and as a result, the contractibility of the viscous fluid 1 such as an adhesive, the suction force due to the exhaust pressure of the application valve 6, etc. Since the conditions change, there is a problem that the coating amount varies depending on the movement distances s and S of the coating head 5 between the coating points.
[0011]
The present invention solves the above-mentioned conventional problems, and controls the time required to apply the viscous fluid to the application point on the substrate after opening the application valve, regardless of the distance between the application points. Accordingly, it is an object of the present invention to provide a viscous fluid coating apparatus that can suppress variation in the amount of viscous fluid applied and can stably and accurately apply viscous fluid.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a coating head that can move up and down relative to a substrate and is relatively movable in the horizontal plane direction, and the coating head that is positioned in the horizontal plane direction with respect to the substrate opens the coating valve. In the viscous fluid application device that applies the viscous fluid sent by the substrate onto the application point of the substrate when it is at the bottom dead center position, the application valve opens at the application head regardless of the distance between the application points. Is located at the bottom dead center position and is configured to always have the same timing retroactively from the time when the viscous fluid is applied.
[0013]
According to the present invention, the time required to apply the viscous fluid after opening the application valve is always controlled to be constant regardless of the distance between the application points. The pressure condition can always be kept constant, variation in the amount of viscous fluid applied can be suppressed, and highly accurate viscous fluid can be applied.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a viscous fluid application device according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a viscous fluid coating apparatus used in an embodiment of the present invention, and its basic configuration is as already described in the section of [Prior Art]. That is, the viscous fluid coating apparatus has a coating head 5 that can move up and down with respect to the printed circuit board (substrate) 2 and can move relative to the horizontal plane directions X and Y, and is positioned in the horizontal plane directions X and Y with respect to the substrate 2. The head 5 is configured to apply the viscous fluid 1 sent by opening the application valve 6 onto the application point of the substrate 2 when it is at the bottom dead center position.
[0016]
Unlike the conventional example, the control unit 10 in the first embodiment of the present invention sets the opening timing of the coating valve 6 in the horizontal plane directions X and Y with respect to the coating point of the substrate 2 of the coating head 5 as shown in FIG. With respect to the positioning position (17), the moving position of the coating head 5 with respect to the coating point of the substrate 2 is set to a time point (18) when the constant movement amount X remains.
[0017]
The meanings of the solid line and broken line graphs shown in broken lines and (11) to (15) in the timing chart of FIG. 2 are the same as those shown in FIG. The same applies to the case of. In the present embodiment, the application head 5 applies the viscous fluid to the application point of the substrate 2 (15), then rises (12), and then moves in the X-axis direction toward the next application point. At this time, considering the movement of the substrate 2 in the Y-axis direction, the speed state is determined as shown in (13).
[0018]
After moving the distance x between the application points, the application head 5 reaches the positioning position (17), descends there (11), reaches the bottom dead center position, and applies the viscous fluid 1 to the application point of the substrate 2 ( 15).
[0019]
The timing for opening the application valve 6 shown by (18) in FIG. 2 is set at the point (18) when the application head 5 reaches the position before the distance X with respect to the positioning position (17) as described above. Yes.
[0020]
Therefore, by taking the timing of opening the application valve 6 as described above, the time required from when the application valve 6 is opened until the viscous fluid 1 is applied is always constant regardless of the distance x between the application points. It is possible to control, variation in the application amount of the viscous fluid 1 can be suppressed, and high-precision application can be performed.
[0021]
FIG. 3 shows a second embodiment of the present invention, and the controller 10 is different from the conventional example in that the application valve 6 is opened (18), and the application head 5 is at the bottom dead center position to apply the viscous fluid. It is configured to set to a time point before a certain time T _{0 of the} time point (15) to be performed.
[0022]
Therefore, by taking the timing of opening the application valve 6 as described above, the time required from when the application valve 6 is opened until the viscous fluid 1 is applied is always constant regardless of the distance x between the application points. It is possible to control, variation in the application amount of the viscous fluid 1 can be suppressed, and high-precision application can be performed.
[0023]
The present invention can be configured in various ways other than those shown in the above embodiments. For example, the present invention can be applied to a viscous fluid coating apparatus of a type in which the coating head 5 moves in both the X and Y directions to apply the viscous fluid 1 onto the coating point of the substrate 2 that is stopped.
[0024]
【The invention's effect】
According to the present invention, the time required from when the coating valve is opened until the viscous fluid is applied can be constantly controlled regardless of the distance between the application points. Variations can be suppressed and stable and highly accurate viscous fluid can be applied.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a viscous fluid coating apparatus.
FIG. 2 is a timing chart showing operating states of a coating head and a coating valve in the viscous fluid coating apparatus of the first embodiment.
FIG. 3 is a timing chart showing operating states of a coating head and a coating valve in the viscous fluid coating apparatus of the second embodiment.
FIGS. 4A and 4B are timing charts showing operating states of a coating head and a coating valve in a conventional viscous fluid coating apparatus. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Viscous fluid 2 Substrate 5 Application head 6 Application valve 10 Control part

Claims (3)

The coating head, which has a coating head that can move up and down relative to the substrate and can be moved relative to the horizontal plane, is positioned at the horizontal plane with respect to the substrate. In a viscous fluid application device that applies onto the application point of the substrate when in position, the application head opens at the bottom dead center position to apply viscous fluid regardless of the distance between application points. A viscous fluid coating apparatus characterized by being configured to always have the same timing retroactively. The timing at which the coating valve opens is set at a point in time when the movement position of the coating head with respect to the coating point of the substrate remains a certain amount of movement relative to the positioning position in the horizontal plane with respect to the coating point of the substrate of the coating head. Item 2. The viscous fluid coating apparatus according to Item 1. 2. The viscous fluid coating apparatus according to claim 1, wherein the timing at which the coating valve is opened is set to a time point a predetermined time before the time when the coating head is at the bottom dead center position and the viscous fluid is applied.

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