JP2001079473A - Coating nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately discharge a viscous liquid in good response by a simple system. SOLUTION: In a coating nozzle for coating by discharging a bond in a syringe by air pressure, a bond-coating nozzle 30 comprises a cylinder body 30a in communication with the syringe and a discharge part 31 mounted in the cylinder body and provided with a bond discharge opening. In the discharge part 31, a discharge control valve comprising a valve seat 30d, a valve element 32 and a spring 33 is installed. The discharge control valve is provided with an end face 31d holding position of the valve element 32 and a notch part 31C capable of functioning as a flow passage for the bond at the time of discharge. By this constitution, liquid drippings at the time of stopping discharge are avoided by a simple constitution and a coating nozzle for a viscous liquid that can appropriately discharge the viscous liquid in a good response is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous fluid application nozzle for ejecting and applying a viscous fluid such as a bond for bonding electronic parts.

[0002]

2. Description of the Related Art A bond used for bonding an electronic component to a substrate is applied to a predetermined position on the substrate before mounting the electronic component. The application of the bond is performed by a dispenser, and a dispenser that discharges the bond by air pressure is widely used. This pneumatic dispenser applies air pressure to a syringe storing a bond, and discharges the bond from a discharge nozzle mounted on the syringe by the air pressure.

[0003]

In this bond application, it is required that a proper amount of bond corresponding to the type of electronic component is correctly discharged within a predetermined discharge time. However, in the pneumatic dispenser used for applying the bond, it is difficult to completely stop the discharge of the bond at the time of the stop command of the discharge operation, and a so-called liquid dripping phenomenon in which a small amount of the bond is discharged even after the stop command is liable to occur. For this reason, conventionally, it is necessary to separately provide a liquid dripping prevention mechanism such as a mechanism for evacuating the inside of the syringe when the discharge operation is stopped in order to prevent liquid dripping, resulting in a complicated mechanism of the entire dispenser and an increase in cost. There was a point.

Accordingly, an object of the present invention is to provide a viscous fluid application nozzle capable of appropriately discharging a viscous fluid with a simple mechanism and with good responsiveness.

[0005]

A viscous fluid application nozzle according to the present invention is a viscous fluid application nozzle for discharging and applying a viscous fluid stored in a container by pressurizing the viscous fluid with air pressure. A pipe mounted to communicate with the container, a discharge section mounted at a lower end of the pipe and provided with a discharge port for viscous fluid, and a valve built in the discharge section to elastically press a valve body against a valve seat. A discharge control valve that permits the flow of viscous fluid from the pipe to the discharge section only when the air pressure is pressurized to a predetermined value or more, and the discharge control valve holds the position of the valve body And a notch formed around the holding surface and serving as a viscous fluid flow path when the discharge control valve is opened.

According to the present invention, the valve is resiliently pressed against the valve seat, which is built in the discharge portion for discharging the viscous fluid, so that the discharge portion is released from the pipe only when the air pressure is increased to a predetermined value or more. A discharge control valve that allows the flow of viscous fluid to the discharge control valve, a holding surface that holds the position of the valve element in the discharge control valve,
By providing a cutout formed around this holding surface and serving as a flow path for viscous fluid when the discharge control valve is opened, there is no liquid dripping at the time of stopping the discharge with a simple mechanism, and the viscous fluid can be properly responsive. A viscous fluid application nozzle that can be discharged is realized.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of an apparatus for applying a bond according to an embodiment of the present invention, FIG. 2 is a side view of a syringe of the apparatus for applying the bond, FIG. FIG. 3B is a partial sectional view of a coating nozzle of the same bond, and FIGS. 4A and 4B are partial sectional views of a coating nozzle of the same bond.

First, the overall structure of a bond applying apparatus will be described with reference to FIG. In FIG. 1, the main body frame 11
A transparent cover box 12 is covered on the upper part of the box, and components described below are arranged inside the cover box 12. Reference numeral 13 denotes an X table, and 14 denotes a Y table disposed on both sides of the X table 13 so as to be orthogonal to the X table.
Is installed. The application head 15 holds a plurality of syringes 16 and the camera 10. The structure of the syringe 16 will be described later.

The X-table 13 and the Y-table 14, which are moving tables, have motors Mx and My and motors Mx and M.
A ball screw 18 and the like that are driven to rotate by y are provided, and when the motors Mx and My are driven, the head 15 moves horizontally in the X direction and the Y direction. It should be noted that only a part of the motors Mx and My and the ball screw 18 are shown for convenience of drawing.

Below the moving path of the coating head 15, a pair of right and left bar-shaped guide rails 19a and 19b are provided. On the inner surfaces of the guide rails 19a and 19b, a conveyor belt 21 for transporting the substrate 20 is provided. A clamper 19c is provided at the center of one of the guide rails 19a, and presses the substrate 20 against the other guide rail 19b for positioning. Then, a bond is applied to the substrate 20 positioned as described above.

Next, referring to FIG. 2 and FIG.
Syringe 16 which is a container for bond application attached to 5
Will be described. As shown in FIG. 2, the syringe 16 is a cylindrical container, and a bond 1 that is a viscous fluid is stored inside the syringe 16. An application nozzle 30 is mounted on the lower end of the syringe 16. Application nozzle 3
In the lower end portion of the discharge portion 3, a discharge portion 3 provided with a discharge port for bonding is provided.
1 is detachably mounted. The syringe 16 is connected to an air pressurizing means (not shown).
The bond 1 is discharged from the lower end of the substrate 1.

Next, the structure of the application nozzle 30 will be described. As shown in FIG. 3, the application nozzle 30 has a structure in which a discharge unit 31 is attached to a lower end of a tube 30a provided with an inner hole 30b. In the upper part of the tube 30, a brim portion 30c
When the application nozzle 30 is mounted on the syringe 16, the upper end of the tube 30 a is inserted into the hole provided at the lower part of the syringe 16 up to the flange 30 c. In this mounted state, the tube 30a communicates with the syringe 16 via the inner hole 30b.

The discharge portion 31 has an inner hole penetrating from the upper end to the lower end, and the inner hole 31a at the lower end is a discharge hole for discharging a bond. A spring 33 is housed in the inner hole 31b at the intermediate portion, and the spring 33 urges the spherical valve body 32 upward. The diameter of the lower end of the inner hole 30b of the tube 30a is narrowed, and the end surface thereof is a conical valve seat 30d. The valve seat 30d, the valve body 32 and the spring 33 form a discharge control valve built in the discharge part 31.

The valve body 32 is moved by a spring 33 to the valve seat 3.
0d, and a downward force acting on the valve body 32 by the pressure in the inner hole 30b is applied to the spring 33.
Only when it is greater than the urging force, the valve body 32 is pushed down. That is, by appropriately setting the relationship between the magnitude of the air pressure applied in the syringe 16 and the strength of the spring 33, the bond 1 can be discharged from the inner hole 30b only when the air pressure is increased to a predetermined value or more. Inner hole 31
b. At times other than pressurization, the valve body 32 is pressed by the valve seat 30d to close the flow path, whereby the movement of the bond 1 is blocked. That is, the discharge of the bond from the tube 30a to the discharge unit 31 is controlled only by the change in the pressure in the inner hole 30b without performing the opening and closing drive from the outside.

FIG. 3 (b) shows an AA cross section, in which a cross-shaped notch 31c is provided around the inner hole 31b. The notch 31c is used for the bond 1 flowing into the discharge portion 31 from the inner hole 30b when the valve body 32 is pushed down.
Function as a flow path. By providing the notch 31c, it is possible to increase the cross-sectional area of the flow path at the time of discharging the bond, reduce the pipeline resistance, and discharge the bond 1 smoothly.

The shape of the notch 31c is adjusted so that the position of the valve body 32 in the inner hole 31b is maintained.
That is, the position of the valve body 32 is brought into contact with the valve body 32 and
The shape is such that the end face 31d held at the center of b is secured. As a result, the valve element 32 is always in the valve seat 30d.
Is maintained at the position where the sealing property is maintained by ensuring a good contact state with the nozzle, and the discharge control operation can be reliably performed. Here, a cross-shaped example is shown as the shape of the notch 31c, but the shape is not limited to this, and any shape may be used as long as the cross-sectional area is increased while securing the holding surface of the valve body 32.

Next, the discharge control operation of the coating nozzle 30 will be described with reference to FIG. When the air pressure is applied to the syringe 16, the pressure P is applied to the inner hole 36b as shown in FIG. This pressure pushes the valve body 32 downward against the upward biasing force of the spring 3, and a gap is created between the valve body 32 and the valve seat 30d. Then, the bond in the inner hole 30b moves to the discharge unit 31 through this gap. At this time, since the notch 31c is formed in the discharge part 31, the bond smoothly moves to the inner hole 31b without receiving a large resistance, and is discharged from the discharge port 31a.

FIG. 4B shows a state in which pressurization into the syringe 16 is stopped. When the pressure in the inner hole 30b is released, the valve body 32 is elastically pressed by the spring 33 against the valve seat 30d. Thereby, the movement of the bond from the inner hole 30b to the discharge unit 31 is blocked, and the discharge of the bond is stopped. This discharge control valve mechanism has a discharge port 3
Since the setting is made immediately before 1a, the amount of the bond remaining in the discharge portion 31 when the discharge is stopped is extremely small, and therefore, the response when the discharge is stopped is excellent, and the bond flows out of the discharge port 31a after the discharge is stopped. The generation of dripping liquid is prevented.

As described above, by incorporating the discharge control valve for controlling the discharge of the bond immediately before the discharge port 31a, the bond can be easily removed by a simple mechanism without providing a conventionally required mechanism such as a vacuum suction device. It is possible to prevent liquid dripping at the time of stopping the discharge and perform proper discharge of the bond.

[0020]

According to the present invention, the valve body is built in the discharge portion for discharging the viscous fluid, and the valve body is elastically pressed against the valve seat, so that the pipe is removed from the pipe only when the air pressure is increased to a predetermined value or more. A discharge control valve for allowing the flow of the viscous fluid to the discharge section, a holding surface for holding the position of the valve element in the discharge control valve, and a viscous fluid formed around the holding surface when the discharge control valve is opened. By providing the cut-out portion serving as the flow path of the above, a viscous fluid application nozzle that has no liquid dripping at the time of stopping the discharge and has good responsiveness is realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bond application device according to an embodiment of the present invention.

FIG. 2 is a side view of a syringe of the bond applying apparatus according to the embodiment of the present invention.

3A is a side sectional view of a bond application nozzle according to an embodiment of the present invention. FIG. 3B is a partial cross-sectional view of a bond application nozzle according to an embodiment of the present invention.

4A is a partial cross-sectional view of a bond application nozzle according to an embodiment of the present invention. FIG. 4B is a partial cross-sectional view of a bond application nozzle according to an embodiment of the present invention.

[Description of Signs] 1 Bond 16 Syringe 30 Application nozzle 30a Tube 30d Valve seat 31 Discharge part 31a Discharge port 31b Inner hole 31c Notch 32 Valve body 33 Spring

Claims (1)

[Claims] 1. A viscous fluid application nozzle for discharging and applying a viscous fluid stored in a container by pressurizing the container with air pressure, the tube being attached to the container and communicating with the container, and the tube A discharge portion provided with a viscous fluid discharge port attached to the lower end of the valve, and when the air pressure is increased to a predetermined value or more by elastically pressing a valve body built into the discharge portion against a valve seat. A discharge control valve for permitting the flow of viscous fluid from the pipe to the discharge section, a holding surface for holding the position of the valve body on the discharge control valve, and a discharge formed around the holding surface. A viscous fluid application nozzle provided with a notch serving as a viscous fluid flow path when the control valve is opened.