Glue dispensing device and method thereof

A glue dispensing device comprises a base, a pressure control unit, a quantitative glue supply unit and a glue dispensing needle. The base comprises a pressure control chamber and a glue tube body, the pressure control chamber is located inside the base, the glue tube body extends from one end of the base to the other end, and the glue tube body penetrates the pressure control chamber. The pressure control unit is coupled to the pressure control chamber. The quantitative glue supply unit is disposed at one end of the base body and is coupled to the glue tube body. The glue dispensing needle is disposed at the other end of the base and is coupled to the glue tube body. The glue dispensing device uses the pressure change of the pressure control chamber to deform the glue tube body, thereby achieving quantitative glue dispensing effect with accuracy and stability. In addition, a glue dispensing method is also disclosed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a glue dispensing device and a glue dispensing method, and more particularly, to a glue dispensing device and a glue dispensing method capable of dispensing quantitative glue with accuracy and stability.

2. Description of the Prior Art

The bonding technology is commonly used in the semiconductor industry. The bonding technology is to apply glue to the chip or the substrate where it is to be bonded, and then place another chip or substrate at the desired bonding position, so that the chip and the substrate are bonded to each other, or the chips are bonded to each other.

The existing glue dispensing device includes a main body, a glue supply unit and at least one glue dispensing needle, and the main body has at least one glue discharging channel. One end of the glue discharging channel is coupled to the glue supply unit, and the other end of the glue discharging channel is coupled to the glue dispensing needle. The glue supply unit provides glue, and the glue flows to the glue dispensing needle through the glue discharging channel for the glue dispensing process.

Although the existing glue dispensing device can achieve the effect of glue dispensing, there are still many shortcomings, such as:

Disadvantage 1: After the glue reaches the dispensing needle, the glue can only flow out of the dispensing needle with the aid of gravity and the pushing force of the subsequent glue to break through the surface tension. However, when the glue just breaks through the surface tension of the needle and flows out of the glue dispensing needle, the initial amount of glue output will be large and abnormal since the accumulated pressure is released, and the amount of glue output will gradually decrease after a period of time. The amount of glue output tends to stable gradually when the glue dispensing process moves on. When the glue dispensing process is stopped, the residual pressure of the needle will be slowly released, causing some residual glue to flow out slowly.

As mentioned above, it is difficult for the glue dispensing needle to stably control the glue output at the beginning or end of the glue dispensing process.

Disadvantage 2: Glue is a viscous fluid, so the flow rate or the amount of the glue may be affected by external environmental factors such as the machine itself, temperature and humidity during the bonding process, or the glue supply unit, and the glue output will tend to inaccurate and not quantitative.

As described above, in view of the shortcomings of the conventional technology that cannot provide stable and accurate means to dispense glue, it is necessary to seek improvement of prior art techniques.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, after years of researches and efforts, the inventor of the present invention has successfully developed the glue dispensing device and the glue dispensing method of the present application.

The present invention discloses a glue dispensing device, which comprises a base, a pressure control unit, a quantitative glue supply unit and a glue dispensing needle. The base comprises a pressure control chamber and a glue tube body, the pressure control chamber is located inside the base, the glue tube body extends from one end of the base to the other end, and the glue tube body penetrates the pressure control chamber. The pressure control unit is coupled to the pressure control chamber. The quantitative glue supply unit is disposed at one end of the base body and is coupled to the glue tube body. The glue dispensing needle is disposed at the other end of the base and is coupled to the glue tube body.

In an embodiment of the present invention, the glue tube body is an elastic tube body or a rubber tube.

In an embodiment of the present invention, the pressure control unit is a pressure regulating device.

In an embodiment of the present invention, the pressure control unit is coupled to the pressure control chamber through a joint.

In an embodiment of the present invention, the quantitative glue supply unit is a single screw pump, a mono pump or a piston pump.

In an embodiment of the present invention, the quantitative glue supply unit comprises a rotor and a stator, the stator is located outside the rotor, the stator is an elastic body, and the rotor is an eccentric screw.

In an embodiment of the present invention, a glue quantity sensing unit is disposed on the glue dispensing needle to sense a glue output of the glue dispensing needle.

The present invention discloses a glue dispensing device comprises a base and a glue dispensing needle. The base comprises a pressure control chamber and a glue tube body, wherein the pressure control chamber is located inside the base, the glue tube body extends from one end of the base to the other end, and the glue tube body penetrates the pressure control chamber. The glue dispensing needle is disposed at one end of the base and coupled to the glue tube body.

The present invention discloses a glue dispensing method, comprising the following steps of: a quantitative glue supply unit providing a glue to a glue dispensing needle through a glue tube body; when the glue of the glue dispensing needle is about to break through the surface tension and flow out of the dispensing needle, a pressure control unit providing a pressurized air to a pressure control chamber, so as to increase the pressure inside the pressure control chamber to pressurize the glue tube body, and to make the pressurized glue tube body to compress inward, causing the glue inside the glue tube body to be squeezed to the glue dispensing needle, thereby allowing the glue to overcome the surface tension to be stably output to the dispensing needle; and when a glue output of the glue dispensing needle reaches a required glue output, the pressure control unit stops providing the pressurized air to the pressure control chamber, allowing the pressure control chamber to return to a normal pressure state, and the glue tube body to return to an unpressurized state.

In an embodiment of the present invention, if the pressure inside the pressure control chamber cannot overcome the surface tension after the glue tube body is pressurized, the pressure control unit can provide the pressurized air to the pressure control chamber again or continuously, so as to increase the pressure inside the pressure control chamber to squeeze the glue tube body further to overcome the surface tension, thereby squeezing more glue to the glue dispensing needle.

With the above-mentioned glue dispensing device and the dispensing method, and using the pressure change of the pressure control chamber to deform the glue tube body, the present invention can achieve quantitative glue dispensing effect with accuracy and stability.

REFERENCE NUMERALS

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In order to enable those skilled in the art to fully understand the technical features, content and advantages of the present invention and the effects that can be achieved, the present invention is hereby described in detail as follows in the form of embodiments in conjunction with the drawings. The purpose of the drawings used is only for illustration and auxiliary description, and may not necessarily be the real scale and precise configuration after the implementation of the present invention. Therefore, the proportion and configuration relationship of the attached drawings should not be interpreted or limited to the scope of rights in actual implementation will be described first.

Please refer toFIG.1for a schematic view of a glue dispensing device according to an embodiment of the present invention. As shown in the figure, the glue dispensing device includes a base10, a pressure control unit11, a quantitative glue supply unit12, a glue dispensing needle13, and a glue quantity sensing unit14.

The base10comprises a pressure control chamber100and a glue tube body101. The pressure control chamber100is located inside the base10. The glue tube body101is located inside the base10and extends from one end of the base10to the other end, and the glue tube body101penetrates the pressure control chamber100. The glue tube body101is an elastic tube body or a rubber tube.

The pressure control unit11is an air compressor. The pressure control unit11is coupled to the pressure control chamber100of the base10through a joint102. The joint102can be a valve body, a two-way valve or a tube body.

The quantitative glue supply unit12is disposed at one end of the base10and is coupled to the glue tube body101. The quantitative glue supply unit12is a mono pump or a piston pump. In an embodiment, the quantitative glue supply unit12is a mono pump, it includes a rotor121and a stator120, and the stator120is located outside the rotor121. The stator120is an elastic body. The rotor121is an eccentric screw. When the rotor121rotates, a chamber with the same cross-sectional area will be formed, and the liquid transported in the chamber will be divided into individual packets, so the quantitative glue supply unit12has the advantage of stable glue supply, and is not affected by the machine itself or external environmental factors during the bonding process.

When the quantitative glue supply unit12is a piston pump, the piston pump may be a single piston pump, a horizontal piston pump, an axial piston pump, or a radial piston pump. The single-piston pump comprises an eccentric wheel, a piston, a spring, a cylinder, and two one-way valves. A closed volume is formed between the piston and the cylinder bore. The horizontal piston pump mainly comprises a plurality of pistons (3 pistons or 6 pistons) installed in parallel, and a crankshaft is used to directly push the piston to move back and forth through the connecting rod slider or the eccentric shaft to provide the hydraulic pressure of suction and discharge. The axial piston pump is a piston pump in which the moving direction of the piston is parallel to the central axis of the cylinder. The radial piston pumps are divided into two types: pressure-driven oil supply type and self-priming oil type. The radial pistons are divided into two categories: pump valve distribution and axial distribution.

In an embodiment, the quantitative glue supply unit12is a piston pump, the piston pump maybe a positive displacement pump or a reciprocating pump. The piston pump makes the fluid flow by using the pressure difference generated by the reciprocating motion of the piston in the piston cylinder, which causes the change of the sealing volume in the piston cylinder. Therefore, the delivery volume or flow rate of the fluid can be controlled by adjusting the pressure difference. Thus the piston pump can provide a quantitative amount of glue through the control of the pressure difference, and is not affected by the machine itself or external environmental factors during the bonding process.

The glue dispensing needle13is disposed at the other end of the base10and is coupled with the glue tube body101.

The glue quantity sensing unit14is disposed on the glue dispensing needle13to sense the glue output from the dispensing needle13. The glue sensing unit14can be a proximity switch, a capacitive sensor, or an optical sensor. The glue sensing unit14is electrically connected to the pressure control unit11.

Please refer toFIG.2for a schematic view of a pressure control chamber of the glue dispensing device in a pressurized state according to an embodiment of the present invention. As shown in the figure, before the glue dispensing process, the glue sensing unit14sends a glue dispensing signal to the pressure control unit11, and the pressure control unit11provides a pressurized air. The pressurized air enters the inside of the pressure control chamber100through the joint102to increase the pressure inside the pressure control chamber100, and the pressurized air compresses the glue tube body101to push it further inward, so as to squeeze the glue inside the glue tube body101to the dispensing needle13, thereby increasing the amount of glue at the dispensing needle13, and making the glue overcome the surface tension to be able to flow out of the dispensing needle13, and in a very short time, the amount of glue output will be increased to a stable output, so that problems in the prior art such as the glue output at the initial stage of glue dispensing will slowly increase and the glue could overflow in the subsequent process can be eliminated.

If the pressure inside the pressure control chamber100cannot overcome the surface tension after the glue tube body101is pressurized, the pressure control unit11can provide the pressurized air to the pressure control chamber100again or continuously, so as to increase the pressure inside the pressure control chamber100to squeeze the glue tube body101further to overcome the surface tension, thereby squeezing more glue to the glue dispensing needle13.

In addition, after the glue has been dispensed for a period of time, when the glue sensing unit14sends a signal to the pressure control unit11to indicate that the amount of glue dispensed has reached the standard, the internal pressure of the pressure control chamber100is gradually restored to an original unpressurized state, and the glue tube body101is gradually restored to the state where it is not squeezed. The internal pressure of the pressure control chamber100can be released to the pressure control unit11through the joint102, so that the internal pressure of the pressure control chamber100can return to the original unpressurized state.

The quantitative glue supply unit12can supply glue stably and quantitatively, so the glue dispensing speed of the dispensing needle13can be maintained stable, and the glue flow rate can be maintained stable, thereby achieving accurate and quantitative effects.

If the glue sensing unit14senses that the glue output of the dispensing needle13is not normal and maintenance is required, for example, the dispensing needle13is blocked or stained, or the dispensing needs to be stopped during the dispensing process. Then the glue sensing unit14sends an alerting signal to the pressure control unit11.

Please refer toFIG.3for a schematic view of the pressure control chamber of the glue dispensing device in a decompressed state according to an embodiment of the present invention. As shown in the figure, the pressure control unit11provides a negative pressure (suction) to the pressure control chamber100through the joint102to reduce the internal pressure of the pressure control chamber100. The glue tube body101is affected by the low pressure of the pressure control chamber100and expands outward, so that the glue stays inside the glue tube body101, and the glue dispensing needle13stops dispensing the glue. Then a person can clean, repair or replace the dispensing needle13.

If the glue sensing unit14senses that the glue is still flowing out of the dispensing needle13, the glue sensing unit14sends an alerting signal to the pressure control unit11, and the pressure control unit11further provides negative pressure to decrease the pressure inside the pressure control chamber100again. The internal pressure of the pressure control chamber100is controlled to make the glue pipe body101expand more, so as to further prevent the glue from flowing out of the glue dispensing needle13.

As mentioned above, if the pressure control chamber100is not decompressed enough to prevent the glue from flowing out of the dispensing needle13after the above negative pressure is provided, the pressure control unit11can again or continuously provide negative pressure to the pressure control chamber100to reduce the pressure inside the pressure control chamber100, so that the glue tube body101expands more, thereby preventing the glue from flowing out of the dispensing needle13.

When the above maintenance, cleaning or replacement is completed, the pressure control unit11stops decompressing, the internal pressure of the pressure control chamber100is gradually restored to the initial state which it was not decompressed, and the glue tube body101is gradually restored to an unexpanded state. The pressure control unit11provides a positive pressure to the pressure control chamber100through the joint102, or external air flows into the pressure control chamber100through the joint102, so as to restore the internal pressure of the pressure control chamber100to the initial state which it was not decompressed, and allow the glue to flow out of the dispensing needle13.

A glue dispensing method according to an embodiment of the present invention comprises the steps of:

Step 1: dispensing glue stably, please refer toFIG.1again. The quantitative glue supply unit12provides glue to the glue dispensing needle13through the glue tube body101.

Step 2: dispensing quantitative glue precisely, please refer toFIG.2again. The glue sensing unit14sends a glue dispensing signal to the pressure control unit11, and the pressure control unit11provides a pressurized air. The pressurized air enters the inside of the pressure control chamber100through the joint102to increase the pressure inside the pressure control chamber100, and the pressurized air compresses the glue tube body101to push it further inward, so as to squeeze the glue inside the glue tube body101to the dispensing needle13, thereby increasing the amount of glue at the dispensing needle13, and making the glue overcome the surface tension to be able to flow out of the dispensing needle13with a normal flow rate, and in a very short time, the amount of glue output will be increased to a stable output.

If the pressure inside the pressure control chamber100cannot overcome the surface tension after the glue tube body101is pressurized, the pressure control unit11can provide the pressurized air to the pressure control chamber100again or continuously, so as to increase the pressure inside the pressure control chamber100to squeeze the glue tube body101further to overcome the surface tension, thereby squeezing more glue to the glue dispensing needle13.

Step 3: restoring the pressure of pressure control chamber100to a normal pressure. When the glue sensing unit14sends a signal to the pressure control unit11to indicate that the amount of glue dispensed has reached the standard, the internal pressure of the pressure control chamber100is gradually restored to an original unpressurized state, and the glue tube body101is gradually restored to the state where it is not squeezed. The internal pressure of the pressure control chamber100can be released to the pressure control unit11through the joint102, so that the internal pressure of the pressure control chamber100can return to the original unpressurized state.

Step 4: stopping glue dispensing or doing maintenance, please refer toFIG.3again. When the glue sensing unit14senses that the glue output of the dispensing needle13is not normal and maintenance is required, for example, the dispensing needle13is blocked or stained, or the dispensing needs to be stopped for maintenance or replacement. The pressure control unit11provides a negative pressure to the pressure control chamber100to reduce the internal pressure of the pressure control chamber100. The glue tube body101is affected by the low pressure of the pressure control chamber100and expands outward, so that the glue stays inside the glue tube body101, and the glue dispensing needle13stops dispensing the glue. Then a person can clean, repair or replace the dispensing needle13.

If the glue is still flowing out of the dispensing needle13, the pressure control unit11further provides negative pressure to decrease the pressure again. The internal pressure of the pressure control chamber100is controlled to make the glue pipe body101expand more, so as to further prevent the glue from flowing out of the glue dispensing needle13.

Step 5: restoring the pressure of pressure control chamber100to a normal pressure. When the glue sensing unit14sends a signal to the pressure control unit11to indicate that there is no abnormality found in the glue dispensing needle13, the pressure control unit11stops providing negative pressure, and the internal pressure of the pressure control chamber100is gradually restored to the initial state which it was not decompressed, and the glue tube body101is gradually restored to an unexpanded state. The external air can flow into the pressure control chamber100through the joint102, so as to restore the internal pressure of the pressure control chamber100to the initial state which it was not decompressed (that is, the normal pressure state).

As mentioned above, the present invention uses the pressure change of the pressure control chamber100to deform the glue tube body100, thereby achieving quantitative glue dispensing effect with accuracy and stability.

The above descriptions are only exemplary, and are used to illustrate the preferred embodiments of the technical content of the present invention, but are not intended to limit the present invention. Equivalent replacements, modifications or alterations made by those skilled in the art based on the teachings of the contents disclosed in the specification are included in the claims of the present invention without departing from the scope of the present invention.