Frame conveying track of discrete device DFN packaging production line

Abstract

The utility model provides a frame conveying track of a discrete device DFN packaging production line, which is used for carrying a frame to be installed and welded, a clamping and moving device for clamping and moving the frame is arranged on the frame conveying track, the frame conveying track comprises a fixed track and a variable track, and the fixed track and the variable track are arranged in parallel. The variable track adjusts the distance from the fixed track, the upper surfaces of the fixed track and the variable track form a frame slideway, and a frame is conveyed in the frame slideway; the clamping and moving device comprises a linear motor parallel to the variable track, a plurality of rotor seats are arranged on the linear motor in a sliding mode, clamping jaws are arranged on the rotor seats, the variable track is wrapped with the clamping jaws, and the clamping jaws are vertically clamped on the side edges of the frame. By arranging the width-adjustable frame conveying track, the adaptability of the production line to different frames is improved, the packaging production capacity of a packaging production line without a carrier is improved, and the application range of the production line is greatly widened.

Description

Technical Field

[0001] The utility model relates to a packaging mechanism for discrete devices, in particular to a frame conveying track of a discrete device DFN packaging production line. Background Art

[0002] In discrete device packaging, DFN packaging is a new type of pinless packaging, using advanced double-sided or square flat lead-free packaging. In the existing discrete device assembly welding process, a carrier-type packaging form with a graphite boat as a carrier is usually used. At the beginning of the assembly welding process, the frame is laid flat on the carrier, and packaging operations such as crystal extraction, crystal bonding, glue dispensing, and glue brushing are completed on the carrier. When transferring parts, the main operation is to carry out the transfer of the carrier.

[0003] In the existing new packaging form such as DFN, because the frame form is different from the conventional discrete device frame in the prior art, the existing frame has a certain thickness, so the frame has higher strength and rigidity. In order to improve the packaging efficiency and packaging accuracy, it is necessary to develop a carrier-free packaging form.

[0004] In DFN packaging production, if you consider packaging the frame without a carrier, you need to fully consider the adaptability of the production line to the frame, mainly considering how the production line adapts to frames of different widths. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to make the same production line in a DFN assembly welding packaging production line adapt to frames of different models and widths. The utility model provides a frame conveying track of a discrete device DFN packaging production line to solve the above problem.

[0006] The utility model solves the technical problem by adopting the following technical solution: a frame conveying track of a discrete device DFN packaging production line, which is used for carrying frames to be assembled and welded; a clamping and moving device for clamping and moving the frames is arranged on the frame conveying track; the frame conveying track comprises a fixed track and a variable track, the fixed track and the variable track are arranged in parallel, the variable track adjusts the distance with the fixed track, the upper surfaces of the fixed track and the variable track form a frame slideway, and the frames are transported in the frame slideway; the clamping and moving device comprises a linear motor arranged parallel to the variable track, a plurality of mover seats are slidably arranged on the linear motor, a clamping claw is arranged on the mover seat, the clamping claw is outwrapped on the variable track and clamped on the side of the frame up and down.

[0007] Furthermore: the frame transmission track is also provided with a spacing adjustment mechanism, and the spacing adjustment mechanism includes a plurality of adjustment screws arranged perpendicular to the variable track, and an adjustment nut and an adjustment motor are installed on the adjustment screw. The adjustment nut is fixedly connected to the variable track, and the adjustment motor drives the adjustment screw to rotate and then drives the adjustment nut to move, thereby realizing the distance adjustment between the variable track and the fixed track.

[0008] Furthermore, an alignment cylinder is installed on the fixed track, and the alignment cylinder pushes the frame on the frame slide toward the variable track so that the edge of the frame is close to the inner side of the variable track.

[0009] The beneficial effect of the utility model is that the frame conveying track of the discrete device DFN packaging production line of the utility model increases the adaptability of the production line to different frames by setting a frame conveying track with adjustable width, improves the packaging production capacity of the carrier-free packaging production line, and greatly improves the application scope of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 This is a schematic diagram of the overall structure of the entire process of a DFN packaging assembly welding packaging production line for discrete devices of the utility model;

[0012] Figure 2 yes Figure 1 Schematic diagram of the structure and appearance of the center material delivery platform, glue brushing station, and mounting station;

[0013] Figure 3 It is a schematic diagram of the structure of the frame conveying track and the clamping moving device;

[0014] Figure 4 It is a structural diagram of the frame conveying track and the spacing adjustment mechanism;

[0015] Figure 5 It is a structural diagram of the lower brush glue seat;

[0016] Figure 6 It is a structural diagram of the upper glue brushing station;

[0017] Figures 7 to 9 It is a structural diagram of the dispensing station.

[0018] In the figure, 1, frame transmission track, 2, frame, 3, material delivery platform, 4, glue brushing station, 5, mounting station, 6, glue dispensing station, 7, jumper packaging station, 8, welding station, 9, fixed track, 10, variable track, 11, linear motor, 12, mover seat, 13, clamping claw, 14, clamping moving device, 15, adjusting screw, 16, adjusting nut, 17, adjusting motor, 18, spacing adjustment mechanism, 19, frame bearing seat, 20, carrier lifting screw, 21. Carrier lifting nut, 22. Carrier lifting motor, 23. Carrier lifting slider, 24. Carrier lifting rail, 25. Carrier lifting mechanism, 26. Glue brushing lifting mechanism, 27. Glue brushing steel mesh, 28. Brush head, 29. Alignment cylinder, 601. Fixed frame, 602. Vertical frame, 603. Horizontal frame, 604. Glue dispensing cylinder, 605. Tracking wheel, 606. Tracking track, 607. Pull spring, 608. Glue dispensing head, 609. Detection camera. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0022] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0023] like Figure 1 As shown, the utility model provides a welding packaging production line for discrete device DFN packaging, including a frame transmission track 1, which is used to circulate and transport frames 2 to be welded, and a clamping and moving device 14 for clamping and moving the frames 2 is arranged on the frame transmission track 1; a material delivery platform 3, which is arranged at the starting end of the frame transmission track 1, and the grouped frames 2 are delivered to the frame transmission track 1 one by one; a glue brushing station 4, which is arranged at the rear of the material delivery platform 3 along the transmission direction of the frame transmission track 1, and the frames 2 on the frame transmission track 1 are glued online; a mounting station 5, which is arranged at the rear of the glue brushing station 4 along the transmission direction of the frame transmission track 1 , chip mounting is performed on the frame 2 on which glue has been applied on the frame transmission track 1; a glue dispensing station 6 is arranged at the rear of the mounting station 5 along the transmission direction of the frame transmission track 1, and glue is performed on the upper surface of the chip on which the frame 2 has been mounted on the frame transmission track 1; a jumper packaging station 7 is arranged at the rear of the glue dispensing station 6 along the transmission direction of the frame transmission track 1, a jumper is obtained by CLIP punching, and the jumper is mounted on the upper surface of the chip of the frame 2 on the frame transmission track 1; a welding station 8 is arranged at the rear of the jumper packaging station 7 along the transmission direction of the frame transmission track 1, and the assembled frame 2 is welded.

[0024] The packaging production line of the present application is aimed at packaging a DFN type frame 2. This type of frame 2 packaging mainly includes applying glue on the frame 2, mounting the chip to the corresponding position of the frame 2 that has been glued, applying glue on the chip again, mounting the jumper wire on the chip, and finally completing the soldering and curing.

[0025] Frame 2 is directly transferred on frame transfer track 1, without setting graphite carrier, and processes such as glue brushing, glue dispensing, and mounting are directly operated on frame 2, effectively avoiding the low transfer efficiency, low heat transfer efficiency, low transfer accuracy and other disadvantages in the traditional solid crystal process with graphite carrier. In addition, in the technical solution of this application, in view of the flatness and regularity of frame 2, the glue brushing process is adopted in the glue application of the front-end frame 2, which can apply glue to all PAD points at one time, and the size and shape of the glue dots can be controlled, which greatly improves the gluing efficiency of frame 2.

[0026] After the chip is mounted, glue is applied on the chip by dispensing before the jumper packaging, taking into account factors such as inconsistent chip thickness after mounting and positive pressure sensitivity on the chip surface. This ensures the consistency of packaging and the qualified rate of packaged devices, and improves the packaging quality.

[0027] like Figures 2 to 6 As shown, the frame transmission track 1 includes a fixed track 9 and a variable track 10, the fixed track 9 and the variable track 10 are arranged in parallel, the variable track 10 adjusts the distance from the fixed track 9, the upper surfaces of the fixed track 9 and the variable track 10 form a frame slide, and the frame 2 is transmitted in the frame slide; the frame transmission track 1 also includes a clamping and moving device 14, the clamping and moving device 14 includes a linear motor 11 arranged parallel to the variable track 10, a plurality of mover seats 12 are slidably arranged on the linear motor 11, and a clamping claw 13 is arranged on the mover seat 12, and the clamping claw 13 is wrapped around the variable track 10 and clamped on the side of the frame 2 up and down.

[0028] The frame transmission track 1 is also provided with a spacing adjustment mechanism 18, and the spacing adjustment mechanism 18 includes a plurality of adjustment screws 15 arranged perpendicular to the variable track 10, and an adjustment nut 16 and an adjustment motor 17 are installed on the adjustment screw 15. The adjustment nut 16 is fixedly connected to the variable track 10, and the adjustment motor 17 drives the adjustment screw 15 to rotate and then drives the adjustment nut 16 to move, so as to realize the distance adjustment between the variable track 10 and the fixed track 9.

[0029] Since the frame 2 is directly placed in the frame transfer track 1 for transmission, the different lengths of different frames 2 will not affect the placement of the frame 2 in the frame transfer track 1, but the widths of different frames 2 will affect the installation of the frame 2 in the frame transfer track 1. In order to adapt to frames 2 in DFN packages of different specifications and ensure greater adaptability of the packaging production line, the frame transfer track 1 is set to a combination of a fixed track 9 and a variable track 10, wherein the variable track 10 can adjust the distance from the fixed track 9, so that it can adapt to frames 2 of different widths, thereby improving the adaptability of the packaging production line to frames 2 of different specifications.

[0030] The clamping and moving device 14 is used to move and transport the frame 2 located in the frame slide, and the method of pretending to outsource the variable track 10 can, on the one hand, ensure that the upper and lower clamping claws 13 can reliably clamp the frame 2, and on the other hand, the frame 2 is still flat and snugly located in the frame slide while being clamped, which can avoid deformation and bending of the frame 2. Especially when the chip is mounted on the frame 2, the flatness of the frame 2 itself is more important. It is necessary to ensure that the frame 2 always remains flat during the transmission movement and the mounting and gluing process to avoid the displacement of other components on the frame 2 such as chips and jumpers, and to avoid the occurrence of unqualified phenomena such as point offset or package misalignment.

[0031] The glue brushing station 4 includes an upper glue brushing platform and a lower glue brushing seat, and the lower glue brushing seat includes a frame bearing seat 19 arranged between the variable track 10 and the fixed track 9, and a platform lifting mechanism 25 is arranged below the frame bearing seat 19 to drive it to move up and down, and the platform lifting mechanism 25 includes a vertically arranged platform lifting screw 20, a platform lifting nut 21 installed on the platform lifting screw 20, a platform lifting motor 22 installed on the platform lifting screw 20, a vertically fixed platform lifting slider 23 and a platform lifting slide rail 24 vertically slidably arranged on the platform lifting slider 23 and fixedly connected to the platform lifting nut 21; the frame bearing seat 19 is fixedly arranged at the top of the platform lifting slide rail 24, and the frame bearing seat 19 lifts the frame 2 in the frame slide upward to separate it from the frame slide and approach the upper glue brushing platform above.

[0032] Considering that the upper glue brushing station needs to be pressed onto the frame 2 to complete the glue brushing operation, if the frame 2 is directly glued in the frame slide, since the bottom of the frame 2 in the frame slide is not supported by the entire bottom surface, the positive pressure of the upper glue brushing station will easily cause the frame 2 to deform on the one hand, and on the other hand, the positive pressure of the pressing will easily cause the deformation of the frame slide, resulting in reduced packaging accuracy and even causing the device to fail.

[0033] The technical solution of the present application is to set a lifting frame support seat 19 below the frame slideway at the glue brushing station 4. When waiting for glue brushing, the frame support seat 19 is located at a low position, below the frame slideway. When the frame 2 is transferred to the glue brushing station 4, the frame 2 is located above the frame support seat 19.

[0034] When preparing to apply glue, the frame supporting seat 19 is lifted upward and lifts the frame 2 upward to separate it from the frame slide, and the upper glue-brushing platform can press the frame 2 on the frame supporting seat 19. Since the frame 2 is supported by the entire bottom surface on the frame supporting seat 19, the frame 2 will not be deformed when the upper glue-brushing platform is pressed. Moreover, since the frame 2 is separated from the frame slide, the frame slide will not be deformed either, thereby ensuring the packaging accuracy and improving the packaging quality.

[0035] The upper glue brushing platform includes a glue brushing lifting mechanism 26, a glue brushing steel mesh 27 installed on the glue brushing lifting mechanism 26, and a brush head 28 arranged in the glue brushing steel mesh 27. The brush head 28 reciprocates back and forth along the upper surface of the glue brushing steel mesh 27 under the drive of the reciprocating drive mechanism; the glue brushing steel mesh 27 is arranged above the frame supporting seat 19 and approaches or moves away from the frame supporting seat 19 under the drive of the glue brushing lifting mechanism 26.

[0036] The glue brushing lifting mechanism 26 can be a module mechanism of a screw slider or various driving mechanisms such as a cylinder, and is mainly used to realize the function of pressing the glue brushing steel mesh 27 against the frame 2. The specific structure of this glue brushing lifting mechanism 26 has been maturely applied in this field, so the specific structure is not repeated. After the pressing of the glue brushing steel mesh 27 is completed, the brush head 28 moves back and forth under the drive of the reciprocating driving mechanism to complete the glue application.

[0037] Similarly, the reciprocating drive mechanism can adopt various driving modes such as belt drive, and the specific structure has been maturely applied in this field, so the specific structure will not be described in detail.

[0038] On the fixed track 9 , an alignment cylinder 29 is installed at the position of the glue brushing station 4 , and the alignment cylinder 29 pushes the frame 2 on the frame slide toward the variable track 10 so that the edge of the frame 2 is close to the inner side of the variable track 10 .

[0039] At the glue brushing station 4, the frame 2 needs to be lifted up by the frame bearing seat 19 and then pressed and glued. In order to ensure the position accuracy of the frame 2 on the frame bearing seat 19, the alignment cylinder 29 is selected to be installed. When the frame 2 moves to the glue brushing station 4, the position accuracy of its length direction is ensured by the clamping moving device 14, and the alignment cylinder 29 pushes the frame 2 in place to make it close to the inner side of the variable track 10 to ensure its position accuracy in the width direction, so that the accurate positioning of the frame 2 on the frame bearing seat 19 can be ensured, and the precise glue application in the glue brushing process can be ensured.

[0040] One mounting station 5 and one glue dispensing station 6 form a mounting group; along the transmission direction of the frame transmission track 1, a plurality of mounting groups are arranged between the glue applying station 4 and the jumper packaging station 7.

[0041] Since the cycle time of the gluing process and the mounting process is significantly higher than that of the glue brushing or jumper packaging, multiple mounting groups are configured. Within the mounting group, a mounting station 5 and a gluing station 6 can be assigned to handle a part of the PAD points. Multiple mounting groups jointly complete the mounting and gluing work of the PAD points of the entire frame 2, reducing the overall cycle time of the mounting station 5 and the gluing station 6 and improving the packaging efficiency of the production line.

[0042] like Figures 7 to 9 As shown, the glue dispensing station 6 includes a fixed frame 601, a vertical frame 602, a horizontal frame 603 and a glue dispensing cylinder 604 installed on the horizontal frame 603, the vertical frame 602 is installed on the fixed frame 601 along the vertical sliding direction, and the horizontal frame 603 is installed on the vertical frame 602 along the horizontal sliding direction;

[0043] The fixed frame 601 is provided with a tracking wheel 605, the transverse frame 603 is provided with a tracking track 606, the tracking wheel 605 abuts against the tracking track 606 in the transverse direction, the fixed frame 601 is provided with a pulling spring 607, and the pulling spring 607 pulls the transverse frame 603 in the transverse direction;

[0044] The tracking track 606 is vertical at the top and inclined at the bottom toward the tracking wheel 605. The dispensing cylinder 604 is inclined, and the inclination direction of the dispensing cylinder 604 is in the same direction as the lower inclination direction of the tracking track 606. A dispensing head 608 is provided at the bottom of the dispensing cylinder 604, and a detection camera 609 is provided on the vertical frame 602. The detection camera 609 is provided directly above the dispensing head 608.

[0045] In the dispensing device designed by this patent, the vertical frame 602 moves in the vertical direction on the fixed frame 601, driving the horizontal frame 603 and the dispensing cylinder 604 to move in the vertical direction, which is the basis for the drop dispensing and lifting disengagement of the dispensing operation. At the same time, the horizontal frame 603 is moving back and forth horizontally relative to the vertical frame 602. Due to the presence of the pulling spring 607, the tracking wheel 605 is always kept in contact with the tracking track 606. The shape of the tracking track 606 will limit the horizontal position of the horizontal frame 603 at different vertical heights in the horizontal direction. Such a composite action will enable the dispensing cylinder 604 to obtain the effect of vertical dispensing and oblique disengagement. Specifically, the tracking track 606 is in the shape of a vertical upper portion and an inclined lower portion toward the tracking wheel 605. When the glue dispensing cylinder 604 extends downward to dispense glue, the tracking wheel 605 contacts the upper vertical area of ​​the tracking track 606. At this time, the horizontal frame 603 does not move horizontally, and the glue dispensing cylinder 604 is in a vertical downward glue dispensing movement mode; when the glue dispensing cylinder 604 moves upward, that is, it leaves the glue dispensing point, the tracking wheel 605 contacts the lower inclined area of ​​the tracking track 606. At this time, the horizontal frame 603 is offset in the horizontal direction. Combined with the horizontal frame 603 being driven in the vertical direction of the vertical frame 602, the comprehensive movement trajectory of the glue dispensing cylinder 604 is an oblique movement. The glue dispensing cylinder 604 can quickly leave the glue dispensing area. On the one hand, it can facilitate the molding of the glue points and optimize the later packaging effect. On the other hand, it can shorten the cycle time of glue dispensing and separation, directly improve the packaging efficiency, and increase the number of packages per unit time.

[0046] In the vertically arranged direct-acting dispensing method of the prior art, since the dispensing cylinder 604 is vertically arranged directly below the driving device, the detection camera 609 for detecting the packaging process is generally arranged on the side of the dispensing cylinder 604 so as to avoid the position of the dispensing cylinder 604. During the packaging process, usually glue is dispensed first, and then the camera moves to the top of the glue point for photo detection, and then moves to the next position to be dispensed after confirmation.

[0047] In the present application, due to the inclined setting of the dispensing cylinder 604, a certain space is reserved above the dispensing head 608, and a detection camera 609 is set directly above the dispensing head 608. The detection camera is set above the vertical frame and does not move with the horizontal frame 603. It is always directly above the glue point of the dispensing head 608. In this way, when the dispensing head 608 completes the dispensing, since the dispensing cylinder 604 is detached obliquely during the detachment process, the dispensing head 608 will also offset the position of the glue point just dispensed during the detachment process. The detection camera 609 located directly above the glue point can take pictures and detect them in time. If qualified, it can enter the next dispensing station 6 to continue the dispensing operation.

[0048] In this design, after the dispensing is completed, the dispensing cylinder 604 moves obliquely and leaves the detection camera 609 for detection, avoiding the need for separate alignment and photo detection in the prior art, shortening the cycle time by about half, and directly doubling the packaging efficiency.

[0049] A welding packaging process for DFN packaging of discrete devices, using a welding packaging production line for DFN packaging, the packaging steps are as follows: S1, frame glue brushing, forming glue points at each PAD point of the frame 2 by a glue brushing process; S2, wafer mounting, mounting the chip on the blue film to the PAD point on the frame 2; S3, glue dispensing, making glue points on the chip of the frame 2 by a glue dispensing process; S4, jumper packaging, mounting the jumper at the glue point on the chip; S5, soldering, soldering and curing the assembled frame 2.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A frame conveying track of a discrete device DFN packaging production line, used for carrying frames (2) to be welded, a clamping and moving device (14) for clamping and moving the frame (2) is arranged on the frame conveying track (1), characterized in that: The frame transmission track (1) comprises a fixed track (9) and a variable track (10), the fixed track (9) and the variable track (10) are arranged in parallel, the variable track (10) adjusts the distance from the fixed track (9), the upper surfaces of the fixed track (9) and the variable track (10) form a frame slideway, and the frame (2) is transported in the frame slideway; the clamping and moving device (14) comprises a linear motor (11) arranged parallel to the variable track (10), a plurality of mover seats (12) are slidably arranged on the linear motor (11), a clamping claw (13) is arranged on the mover seat (12), and the clamping claw (13) is wrapped around the variable track (10) and clamped on the side of the frame (2) up and down.

2. The frame conveying track of a discrete device DFN packaging production line according to claim 1, characterized in that: The frame transport track (1) is further provided with a spacing adjustment mechanism (18), the spacing adjustment mechanism (18) comprising a plurality of adjustment screws (15) arranged perpendicular to the variable track (10), an adjustment nut (16) and an adjustment motor (17) being mounted on the adjustment screw (15), the adjustment nut (16) being fixedly connected to the variable track (10), the adjustment motor (17) driving the adjustment screw (15) to rotate and thereby driving the adjustment nut (16) to move, thereby achieving distance adjustment between the variable track (10) and the fixed track (9).

3. The frame conveying track of the discrete device DFN packaging production line according to claim 2, characterized in that: An alignment cylinder (29) is installed on the fixed track (9), and the alignment cylinder (29) pushes the frame (2) on the frame slide toward the variable track (10) so that the edge of the frame (2) is closely attached to the inner side of the variable track (10).

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