Dispensing device and dispensing method suitable for various conductive adhesives

Abstract

The invention discloses an adhesive dispensing device and an adhesive dispensing method suitable for various conductive adhesives. The adhesive dispensing device comprises a needle tube shell, three needle tubes contained in the needle tube shell, three needle heads and three sets of sliding block systems connected with the three needle tubes correspondingly, reset springs and limiting blocks. The needle tube shells are connected with dispensing equipment, the three needle tubes are used for placing different types of conductive adhesives, and the three needle heads are used for dispensing; the sliding block system comprises a first sliding block, a second sliding block and a third sliding block, the first sliding block is connected with dispensing equipment, the third sliding block is connected with the needle tubes, the first sliding block is connected with the third sliding block through the second sliding block, the reset spring and the limiting block are arranged between the needle tube shell and the three needle tubes, and the limiting block limits the lowest position of the third sliding block in the vertical direction. The reset spring elastically supports the third sliding block. The adhesive dispensing device can be suitable for various micro-assembly processes, the requirement that the same product needs to use various conductive adhesives can be met, and frequent replacement of adhesive pipes is avoided.

Description

Technical Field

[0001] This invention belongs to the field of micro-assembly technology, specifically relating to a dispensing device and dispensing method suitable for various types of conductive adhesives. Background Technology

[0002] With the continuous development of electronic packaging technology, microwave components are constantly evolving towards miniaturization, high density, high reliability, high performance, and mass production. This places higher demands on product controllability, high consistency, high reliability, and high production efficiency. In response to this trend, most micro-assembled products are now produced automatically. However, due to performance and process requirements, the chips in most products need to be bonded using multiple conductive adhesives. Existing dispensing devices can only use one type of conductive adhesive at a time, requiring syringe replacements, which affects product quality and efficiency. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a dispensing device and method suitable for multiple types of conductive adhesives. This dispensing equipment is applicable to various micro-assembly processes, can meet the needs of using multiple types of conductive adhesives for the same product, and avoids frequent replacement of adhesive tubes, effectively improving the operational efficiency of micro-assembly processes and improving product quality.

[0004] To achieve the above objectives, one aspect of the present invention provides a dispensing device suitable for various types of conductive adhesives, comprising a needle housing, three needles housed within the needle housing, three needles respectively connected to the three needles, three sets of sliding block systems, a return spring, and a limiting block;

[0005] The syringe shell is connected to the dispensing equipment and is used to install the dispensing device on the dispensing equipment. The three syringes are the same size and are used to put different types of conductive adhesive. The three needles are used to contact the surface of the product to be dispensed and to perform the dispensing operation using the conductive adhesive placed in the corresponding syringe.

[0006] The sliding block system includes a first sliding block, a second sliding block, and a third sliding block. The first sliding block is connected to the dispensing device, the third sliding block is connected to the needle tube, and the second sliding block connects the first sliding block and the third sliding block. A return spring and a limiting block are disposed between the needle tube housing and the three needle tubes. The limiting block is used to limit the lowest position of the third sliding block in the vertical direction, and the return spring is used to provide elastic support for the third sliding block.

[0007] The sliding block system, return spring, and limit block work together to allow for the interchange of the target needle tube and needle to be used. The first sliding block can move up and down vertically under the control of the dispensing equipment. The movement of the first sliding block is transmitted to the third sliding block through the second sliding block. When the first sliding block moves downward, the return spring is compressed, and the third sliding block drives the corresponding needle tube to move downward until it contacts the limit block. Thus, the target needle tube and needle to be used move downward to the lowest position. When the first sliding block moves upward, the return spring releases its elasticity, pushing the third sliding block to drive the unused needle tube and needle to move upward, forming a height difference with the target needle tube and needle to be used.

[0008] Preferably, the device further includes a knob, and the needle housing and the knob are an integral structure. The knob is used to connect the needle housing to the dispensing equipment.

[0009] Preferably, the device further includes a needle tip, which is connected to the needle shell via a threaded structure.

[0010] Preferably, the limiting block is installed in a preset slot on the inner wall of the syringe shell. By limiting the lowest position of the third sliding block, the three syringes maintain a preset height difference in the initial state, thus preventing the needles from colliding with each other.

[0011] Preferably, the inner wall of the syringe shell is provided with a guide groove, and the third sliding block can move up and down along the guide groove.

[0012] Preferably, the third sliding block is connected to the needle tube by an interference fit and a snap-locking mechanism, and the needle tube and the needle tip are tightly screwed together by threads to form a rigid transmission chain of the third sliding block, the needle tube, and the needle tip.

[0013] Another aspect of the present invention provides a dispensing method suitable for multiple types of conductive adhesives, using the above-described dispensing apparatus to dispense multiple types of conductive adhesives, characterized in that it includes:

[0014] Inject the conductive adhesive into the syringe, and select a dispensing needle suitable for the conductive adhesive and the surface of the product to be dispensed;

[0015] Install the dispensing device on the dispensing equipment;

[0016] The dispensing operation is performed under the control of the dispensing equipment.

[0017] Preferably, the dispensing operation includes an initial positioning stage, a power transmission stage, and a stable dispensing stage.

[0018] During the initial positioning phase, the three sets of sliding block systems maintain a fixed height difference under the constraint of the limit blocks. The third sliding block corresponding to the target needle tube to be used is in the lowest position, and the corresponding needle tip contacts the adhesive surface. The other two sets of unused third sliding blocks are in a high position under the elastic support of the return spring, and the corresponding needle tip is higher than the adhesive surface.

[0019] During the power transmission phase, the dispensing equipment controls the first sliding block corresponding to the target needle tube to be used to move downward, the reset spring is compressed, the third sliding block moves downward until it contacts the limit block, so that the corresponding needle falls down to the dispensing surface. At the same time, the first sliding block corresponding to the original target needle tube is raised upward, the reset spring releases its elasticity, and pushes the third sliding block to move the needle tube upward, returning it to the high position.

[0020] During the stable dispensing stage, the limiting block provides rigid support to counteract the reaction force during dispensing, ensuring that the sliding block system remains stable and the needle position does not shift. The dispensing equipment controls the dispensing pressure and speed, and the conductive adhesive is evenly extruded through the needle to complete the dispensing operation.

[0021] Preferably, the appropriate needle is selected based on the viscosity of the conductive adhesive and the required amount of adhesive at the application site.

[0022] Preferably, the needle is a straight needle or a curved needle. When the area to be glued is obstructed or when glue needs to be applied to the side wall of the housing, a curved needle is selected for glue application.

[0023] According to the above-described aspects of the present invention, the dispensing apparatus and dispensing method applicable to multiple types of conductive adhesives are dispensing equipment applicable to various micro-assembly processes. They can meet the needs of using multiple types of conductive adhesives for the same product, while avoiding frequent replacement of adhesive tubes, effectively improving the operating efficiency of micro-assembly processes and improving product quality. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0025] Figure 1 This is an exploded view of a dispensing device for various types of conductive adhesives according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the syringe shell according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of a dispensing device for various types of conductive adhesives according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] One embodiment of the present invention provides a dispensing device suitable for various types of conductive adhesives, such as... Figure 1-3 As shown, the dispensing device of this embodiment includes a needle shell 1, a knob 2, a return spring 4, a needle head 6, a limiting block 10, three needles 3, three needles 5, and three sets of sliding block systems. The needle shell 1 and the knob 2 are an integral structure. The knob 2 is used to connect the needle shell 1 to the dispensing equipment. The needle head 6 protects the needles 5. Both the needle head 6 and the needle shell 1 have threaded structures to connect them.

[0030] Three identical syringes 3 can hold different types of conductive adhesives, such as 84-1L, nano-silver, and 8456. Three needles 5 and three sets of sliding block systems are connected to the three syringes 3 respectively. The three sets of sliding block systems include a first sliding block 7, a second sliding block 8, and a third sliding block 9. A height difference is created by a return spring 4, the first sliding block 7, the second sliding block 8, the third sliding block 9, and a limiting block 10, allowing the three syringes to be interchanged. The first sliding block 7 is located at the top of the syringe shell 1. The third sliding block 9 is connected to the syringe 3, and the second sliding block 8 connects the first sliding block 7 and the third sliding block 9. The vertical position of the three syringes 3 is fixed by the limiting block 10. The first sliding block 7 is connected and controlled by the dispensing module of the dispensing equipment. It works with the second sliding block 8, the third sliding block 9, and the return spring 4 to change the Z-axis direction of the needle 5, creating a height difference to allow for the interchange of the syringes 3 and needles 5. That is, the needle 5 to be used is fixed at the lowest point by the control of the sliding block system and the return spring 4, and the dispensing operation begins, while other unused needles 5 are at the higher point.

[0031] The working principle of the sliding block system and the mechanism of needle following movement are explained in detail below.

[0032] The sliding block system includes a first sliding block 7, a second sliding block 8, and a third sliding block 9, which work together with the return spring 4 and the limit block 10 to achieve precise control of the needle position. Among them, the first sliding block 7, as the "power connection end" of the system, is rigidly connected to the dispensing module of the dispensing equipment at its top end. It is the core component that receives the displacement signal of the dispensing equipment and transmits the driving force. Its movement trajectory can be precisely controlled by the dispensing equipment program.

[0033] The second sliding block 8 serves as an "intermediate transmission hub." It is flexibly connected to the bottom of the first sliding block 7 and the top of the third sliding block 9 via a snap-fit ​​mechanism. This allows the Z-axis movement (up and down movement) of the first sliding block 7 to be smoothly transmitted to the third sliding block 9. At the same time, it buffers the minor vibrations during the operation of the dispensing equipment and prevents needle displacement deviation.

[0034] The third sliding block 9 is an "execution connection end". Its bottom is fixedly attached to the outer wall of the needle tube 3. Each needle tube corresponds to an independent third sliding block 9, which can directly drive the needle tube 3 and the needle 5 to move synchronously in the Z-axis direction.

[0035] The limiting block 10 is installed in a preset slot on the inner wall of the syringe shell 1 to provide a fixed "positioning reference" for the 3-group sliding block system. By limiting the maximum downward movement (lowest position) of the third sliding block 9, it ensures that the 3 syringes 3 maintain a preset height difference in the initial state and avoids the needles from colliding with each other.

[0036] The following movement of needle 5 relies on the rigid connection of "slider-needle-needle" and precise coordination with the dispensing equipment program. The specific implementation includes three key steps to ensure that the needle displacement is completely synchronized with the program instructions:

[0037] 1. Rigid connection ensures synchronous displacement: The third sliding block 9 and the needle tube 3 are connected by "interference fit + snap locking". The needle tube 3 and the needle 5 are tightly screwed together by threads to form a rigid transmission chain of "sliding block 3 → needle tube → needle". Every Z-axis displacement of the third sliding block 9 will be directly transmitted to the needle 5 through the needle tube 3 without displacement lag or deviation, ensuring that the movement trajectory of the needle 5 and the third sliding block 9 is completely consistent.

[0038] 2. Reset spring controls motion precision: The reset spring 4 is sleeved between the third sliding block 9 and the needle tube shell 1. Its elasticity parameter, elastic coefficient, and compression stroke are precisely calculated: When the first sliding block 7 applies pressure, the spring compresses at a uniform speed, causing the needle 5 to move down smoothly, avoiding the needle hitting the dispensing surface of the product due to excessive speed; when the first sliding block 7 is lifted, the spring rebounds at a uniform speed, and the needle 5 moves up slowly, preventing conductive adhesive from dripping due to inertia and ensuring dispensing quality.

[0039] 3. Intelligent following through program linkage: The dispensing equipment program pre-stores the "position parameters" (including Z-axis coordinates, dispensing angle, and travel distance) of the three needles 5. When the sliding block system triggers a switch, the program synchronously calls the parameters of the corresponding needle: If a curved needle is used (for sidewall dispensing scenarios), the program will synchronously adjust the moving angle of the first sliding block 7. Through the flexible transmission of the second sliding block 8, the third sliding block 9 drives the curved needle to finely adjust its tilt angle (0-45° adjustable) to ensure that the bevel of the needle fits the sidewall to be dispensed. If a needle with a different inner diameter is used (to adapt to conductive adhesives of different viscosities), the program will automatically correct the downward movement distance of the third sliding block 9 to compensate for the difference in needle length and ensure that the distance between the dispensing port and the working surface is always consistent (error ≤ 0.1mm).

[0040] This invention also provides a dispensing method suitable for various types of conductive adhesives. The dispensing device described above is used to dispense various types of conductive adhesives, and includes the following steps:

[0041] S1. First, inject the conductive adhesive into the syringe. Up to three different conductive adhesives can be used. Insert the three syringes into the limiting block 10 and the return spring 4, put on the syringe shell 1, fix the syringe head 6 and the knob 2, and at the same time select the needle 5 that is suitable for the conductive adhesive and the surface of the product to be glued.

[0042] S2, Install the device on the dispensing equipment;

[0043] S3, Adjust the horizontal height of the dispensing device and perform needle calibration and other operations;

[0044] S4, Pre-dispense glue on the pre-dispensing tray;

[0045] S5, under the control of the dispensing equipment, performs dispensing operations on the product according to a pre-programmed procedure (specifying the different parameters, conductive adhesive, and needle for each dispensing location). The dispensing module can be programmed to specify the type of conductive adhesive used at each dispensing location, the corresponding needle, and the different dispensing parameters.

[0046] During the dispensing operation, the sliding block system achieves the orderly switching of the three syringes through a linkage mechanism of "power transmission - spring reset - limit locking". The core principle is divided into the following three stages:

[0047] 1. Initial positioning stage: After the device is assembled, the three sets of sliding block systems maintain a fixed height difference under the constraint of the limit block 10. The third sliding block 9 corresponding to the target needle tube to be used is in the "lowest limit position", and the needle 5 connected to it just contacts the dispensing working surface. The other two sets of unused third sliding blocks 9 are in the "high position standby" state under the elastic support of the return spring 4, with the needle 5 5-8mm higher than the working surface to avoid contact with the product or worktable.

[0048] 2. Power Transmission Stage: When the dispensing equipment program triggers the "needle switching" command, the dispensing module drives the first sliding block 7 to move along the Z-axis. If a needle in high-position standby mode needs to be activated, the first sliding block 7 applies downward pressure, which is transmitted to the corresponding third sliding block 9 through the second sliding block 8. This compresses the reset spring 4, causing the third sliding block 9 to break through the initial high position and move down along the guide groove on the inner wall of the needle shell 1 until it contacts the limit block 10. At this time, the needle tip 5 of the needle falls precisely onto the working surface. Simultaneously, the first sliding block 7 corresponding to the original target needle rises upward, the reset spring 4 releases its elasticity, and pushes the third sliding block 9 to move the needle upward, returning it to the "high-position standby" state.

[0049] 3. Stable dispensing stage: After the third sliding block 9 of the target needle contacts the limiting block 10, the limiting block 10 provides rigid support to counteract the reaction force during dispensing, ensuring that the sliding block system remains stable and the position of the needle 5 does not shift; at this time, the dispensing equipment controls the dispensing pressure and speed according to the preset program, and the conductive adhesive is evenly extruded through the needle 5 to complete the dispensing operation at this part.

[0050] Needle 5 comes in different types and sizes. By selecting the correct and appropriate needle, it can be used for conductive adhesives of various viscosities. There are many types of needle 5 with different inner and outer diameters, including high precision and general-purpose needles. They can be selected according to different viscosities and adhesive volume requirements.

[0051] Both syringe 3 and needle 5 are replaceable and combinable, enabling the application of multiple conductive adhesives for the same product in a single application without the need for frequent changes of dispensing needles and syringes. For example, if a product requires three types of conductive adhesive, they can be placed in three separate syringes, and the corresponding needle can be selected according to the viscosity of the three conductive adhesives and the amount of adhesive required at the application site.

[0052] The needle's inner and outer diameters can be of different sizes, and it can be either a straight or curved needle to meet the needs of different products. Normally, if there are no other components or housing obstructing the dispensing area, a straight needle can be used perpendicularly to the dispensing location. However, if there are obstructions in some areas, or if dispensing needs to be done on the side wall of the housing, a curved needle must be used. Different combinations of needles and syringes can meet the needs of a wider range of dispensing processes.

[0053] The dispensing apparatus and dispensing method for various types of conductive adhesives according to embodiments of the present invention have the following beneficial effects:

[0054] a) This invention solves the problem of frequent needle and conductive adhesive replacements during the dispensing process due to the use of multiple conductive adhesives for the same product; the device and method of this invention can basically complete the dispensing in a single operation, thus improving efficiency.

[0055] b) The device of this invention has a reasonable structural design and is easy to manufacture. By changing three different syringes and using a pre-programmed procedure, multiple conductive adhesives can be applied in one go without changing the syringes, saving time and cost.

[0056] Taking a certain TR product as an example, according to the process requirements, this product requires three types of conductive adhesive (84-1L, 8456, and H20E) to attach the chip. Previously, conventional dispensing devices were used, which consisted of a single needle connected to the dispensing module on the dispensing equipment. Only one type of adhesive could be dispensed at a time, and the needle and syringe needed to be changed after each application of the three types of adhesive to prevent cross-contamination. Additionally, three separate programs needed to be written to alternately meet the requirements of the three types of adhesive. However, using the device of this invention, it can work in conjunction with the dispensing module and program of the dispensing equipment. A single program can be created, placing different conductive adhesives in different syringes. By switching between different syringes, the entire dispensing process can be completed in one go, saving time spent on changing syringes, cleaning, and calling up programs.

[0057] Because of existing technology, if a product uses multiple conductive adhesives, each time the conductive adhesive is changed, the program, needle and syringe need to be changed, and re-alignment and calibration are required. At the same time, the warming and curing of the conductive adhesive also requires more time. Therefore, with the device and method of the present invention, up to three different conductive adhesives can be dispensed at once, and different syringes are used to dispense the adhesive to the part to be dispensed.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dispensing device suitable for various types of conductive adhesives, characterized in that, It includes a needle shell, three needles housed inside the needle shell, three needles connected to the three needles respectively, three sets of sliding block systems, a return spring, and a limit block; The syringe shell is connected to the dispensing equipment and is used to install the dispensing device on the dispensing equipment. The three syringes are the same size and are used to put different types of conductive adhesive. The three needles are used to contact the surface of the product to be dispensed and to perform the dispensing operation using the conductive adhesive placed in the corresponding syringe. The sliding block system includes a first sliding block, a second sliding block, and a third sliding block. The first sliding block is connected to the dispensing device, the third sliding block is connected to the needle tube, and the second sliding block connects the first sliding block and the third sliding block. A return spring and a limiting block are disposed between the needle tube housing and the three needle tubes. The limiting block is used to limit the lowest position of the third sliding block in the vertical direction, and the return spring is used to provide elastic support for the third sliding block. The sliding block system, return spring, and limit block work together to allow for the interchange of the target needle tube and needle to be used. The first sliding block can move up and down vertically under the control of the dispensing equipment. The movement of the first sliding block is transmitted to the third sliding block through the second sliding block. When the first sliding block moves downward, the return spring is compressed, and the third sliding block drives the corresponding needle tube to move downward until it contacts the limit block. Thus, the target needle tube and needle to be used move downward to the lowest position. When the first sliding block moves upward, the return spring releases its elasticity, pushing the third sliding block to drive the unused needle tube and needle to move upward, forming a height difference with the target needle tube and needle to be used.

2. The dispensing device as described in claim 1, characterized in that, It also includes a knob, with the syringe housing and knob being an integral structure. The knob is used to connect the syringe housing to the dispensing equipment.

3. The dispensing device as described in claim 1 or 2, characterized in that, It also includes a needle tip, which is connected to the needle shell via a threaded structure.

4. The dispensing device as described in claim 1 or 2, characterized in that, The limiting block is installed in a preset slot on the inner wall of the syringe shell. By limiting the lowest position of the third sliding block, it ensures that the three syringes maintain a preset height difference in the initial state and avoids the needles from colliding with each other.

5. The dispensing device as described in claim 1 or 2, characterized in that, The inner wall of the syringe shell is provided with a guide groove, and the third sliding block can move up and down along the guide groove.

6. The dispensing device as described in claim 1 or 2, characterized in that, The third sliding block is connected to the needle tube by an interference fit and a snap-lock mechanism. The needle tube and the needle tip are tightly screwed together by threads, forming a rigid transmission chain of the third sliding block, the needle tube, and the needle tip.

7. A dispensing method applicable to various types of conductive adhesives, characterized in that, The method of dispensing multiple types of conductive adhesives using the dispensing apparatus according to any one of claims 1-6 includes: Inject the conductive adhesive into the syringe, and select a dispensing needle suitable for the conductive adhesive and the surface of the product to be dispensed; Install the dispensing device on the dispensing equipment; The dispensing operation is performed under the control of the dispensing equipment.

8. The method as described in claim 7, characterized in that, The dispensing operation includes the initial positioning stage, the power transmission stage, and the stabilization dispensing stage. During the initial positioning phase, the three sets of sliding block systems maintain a fixed height difference under the constraint of the limit blocks. The third sliding block corresponding to the target needle tube to be used is in the lowest position, and the corresponding needle tip contacts the adhesive surface. The other two sets of unused third sliding blocks are in a high position under the elastic support of the return spring, and the corresponding needle tip is higher than the adhesive surface. During the power transmission phase, the dispensing equipment controls the first sliding block corresponding to the target needle tube to be used to move downward, the reset spring is compressed, the third sliding block moves downward until it contacts the limit block, so that the corresponding needle falls down to the dispensing surface. At the same time, the first sliding block corresponding to the original target needle tube is raised upward, the reset spring releases its elasticity, and pushes the third sliding block to move the needle tube upward, returning it to the high position. During the stable dispensing stage, the limiting block provides rigid support to counteract the reaction force during dispensing, ensuring that the sliding block system remains stable and the needle position does not shift. The dispensing equipment controls the dispensing pressure and speed, and the conductive adhesive is evenly extruded through the needle to complete the dispensing operation.

9. The method as described in claim 7 or 8, characterized in that, Select the appropriate needle based on the viscosity of the conductive adhesive and the required amount of adhesive at the application site.

10. The method as described in claim 7 or 8, characterized in that, The needle can be a straight needle or a curved needle. When the area to be glued is obstructed or when glue needs to be applied to the side wall of the housing, a curved needle should be selected for glue application.

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