TW581829B - Wire spring grip, lead frame carrier belt and plating system - Google Patents

Abstract

A wire spring grip for an IC lead frame and a lead frame carrier belt are described. The grip 20 comprises a wire formed to provide two parallel arms extending from a curved, central portion 22 of the wire. The curved portion 22 is angled from the plane including the portions of the arms immediately adjacent the curved portion 22 to form a gripping portion. The end of each arm is angled to form an arm tip portion 23 for engaging with a belt web 100 so as to support the grip 20. The arms of the grip extend from their ends and form a coil 24 having a plurality of turns. Between each coil 24 and the curved portion 22, each arm is angled to form an engagement portion 25 for biasing the arms against the tension in the spring coils. The grips are supported on the belt 100 with a portion of the arms substantially parallel with the belt web.

Description

581829 ---- Case No. 8 ^ 123674 Moon and Moon_Revision V. Description of the Invention (1) Field of the Invention The present invention relates to a semiconducting cymbal 1C lead frame, a clamping tape, and more particularly to such a type used in a tape. Tape to use p-drop method to strip or tape to plated electronic components. BACKGROUND OF THE INVENTION In the electronic component packaging industry, leads are plated so as to protrude from the insulating packaging layer before use. The leads are generally round wires or flat tips drawn from a plate-shaped material. All shapes must be plated with wires, such as copper or iron alloys, in order to resist corrosion and provide mechanical protection, and to facilitate the combination of beta welding and other components. In the latter example, a lead made of iron alloy is used as an example. Copper was plated with tin before flushing the cloth. Conventional key bonding methods, such as shelf-friendly barrel plating, have been replaced by some methods, in which components to be plated are conveyed on a conveyor belt via a serial processing station. Meerkat Patent No. 5 34 8 43 discloses a contact element for electronically packaged electronic components. The element to be plated is rotated through a plurality of processing stations, including a continuous flexible conveyor belt (made of conductive material). The main electric recording bath, where the conveyor belt is used as the electrode of the galvanic current system, the revealed conveyor belt is composed of a non-recording steel belt, which runs in a horizontal alignment loop and the belt net is vertical. A part of this belt net supports a component. The belt (refer to the figure, the bottom end of the carousel 1 forms a row of elastic misalignment fingers 2, and its pedestal 3 is suitable for the combination of a horizontal cam (for the thin clip fingers on the staggered side of the belt). The carousel is fixed The two cams can separate the fingers, the loading device is inserted into the elastic clamping finger 2 in the winter component tape 4, the cam protrusion 3 is separated, and the elastic clamping finger 2 loses the component tape 4 'and is then supported by the belt. The processing station moves these parts after camming on the fingers to remove the component tape 4 to be plated.

Page 6 581829 123674 of the pulp. Modification of the year _ V. Description of the invention (The disadvantage of the structure of the magic figure 1 is that the elastic clamping means that the friction force that can be applied is very small, and the low clamping force limits the transportable components of the belt. The maximum weight, in addition, after the use of Changs, the clamping force of the elastic clamping finger is reduced, because the elastic clamping finger and the component belt are formed, so-once the clamping force has been reduced to an insufficient level, The entire component belt must be replaced. The P drip conveyor belt of the above-mentioned U.S. patent has been improved, and it is disclosed that a component belt with a movable clamping device is provided, which is a stainless steel leaf spring (pictured). One end of the leaf spring 5 has a suspension 6 extending at a right angle. The suspension 6 is inserted into a slot 7 in the conveyor belt 1 and contacts the front of the conveyor belt 1 to fix the spring. Each reed spring 5 is scaled at right angles. The extension spring finger & extension curved portion 9 extends toward the bottom of the belt net, wherein it passes through the hole 10, and the bent end 11 of the zen spring finger 8 is hooked on the edge of the hole so that it is biased on the belt and becomes Flat end 丨 1 extends to the bottom edge of the belt to lift The clamping device, the spring finger can be coaxed in a way similar to the United States patent 453483 rose holding fingers for automatic loading and unloading. The leaf-shaped spring spring clamping finger is better than the US patent 453483. Including once the holding force is insufficient, each finger can be replaced. ★ Fingers can be manually removed from the belt, mounted, the gripping force of the 窠 -shaped structure holding the finger is still low, so it will soon be insufficient. Therefore, it should be replaced frequently. Among the conventional iC lead frame conveyor belts, the maximum load is about 30ag / 5cn (belt) or i6Gg / holding point, which is insufficient for the roll-to-roll plating process. In AEM Pte's new style patent case No. 2074865, 'Reveal a # alternating belt, the conveyor belt 1 is similar to the previous new style shown in Figure 3b' The clamping device is composed of a plurality of stainless copper wire springs 12, With a cross-section diameter of about 1.2 mm, the wire spring 12 is shaped like a leaf spring of the coil 3a.

581829

The mode clamp is positioned, and the center part of each curve of each wire spring 12 is bent twice, and enters the groove of the conveyor belt 1 to become a suspension 6a. The two arms of the spring extend through the conveyor belt 1 at a right angle, and each arm forms a sequence of spring coils 14 at its Yin Yang section, with approximately 2.5 turns, the top of the loop ^ is on the conveyor belt 1, and the end of the arm is on the conveyor belt The bottom of 丨 extends through two vertical slots 15 (circle 31 >), at its tip 16, the arm is bay to form two wire gripping fingers to replace the leaf-shaped single wide end u, the wire spring can be seen The cross section (side view) of the clamping device is roughly the same as that of the leaf spring clamping device. Except for the spring coil, the wire spring clamping device is better than the leaf spring clamping device. The force increased by about 200 g / grip point. The coil in the spring clamping device will increase the force applied to the groove and the belt downward. 'In order to open the finger, you must press the curtain upward in the plane of the band gauge to lift the gap between the crossbow and the belt net. The tension in the spring is determined by the extreme pressure that can be applied to the spring to open the clamping finger. The finger must be opened to a certain degree to replace the clamping device. Therefore, the negative prayer / unloading machine and must be considered. Capacity and easy removal of practical factors such as the clamping device can determine the maximum clamping force. All of the above cases have the appearance of long beard, long beard refers to the tendency of the remaining genus such as tin to grow thin crystal protrusions on its surface. When the speed of the belt passing through the electroplating device increases, the long term tendency is greatly increased. Long beard is not good, because its appearance is not beautiful and it will cause erosion when it appears in the electroplating bath. Long class will also have short bead, especially when the lead density is high. Summary of the invention The purpose of the present invention is to overcome at least part of the problems of the conventional products described above. '' Especially the object of the present invention is to provide a wire spring holding

Page 8 581829 ___ Case No. 8 & 1236T4 Mu Yuea Amendment __ V. Description of the invention (4) 丨 Fewer clamping points, and if necessary to maintain a high clamping force on the I c lead frame, it can be easily opened And instead, the present invention provides a wire clip pen holder for lead frame wheel feeding, which includes a wire to provide two prosthetic arms extending from a curved portion, and one part of each arm is formed in a wire with a plurality of turns, In the rain, the bent portion forms a loss-holding portion of the spring clip. In the present invention, because the central part of the wire forms a clamping finger, so the rounded edges of Jk appear or the length is reduced or substantially reduced. 0 The end of each arm forms a connecting part to connect the clip to the lead frame conveyor belt 6 The end of each arm It can be angled to form an arm tip portion, which can be combined with a belt net to support the tip. Each tip portion can be formed to include a plane adjacent to the arm portion. Forming about 90. ± 2. The angle b The test curve part can be with the plane, which includes the arm part adjacent to the bay curve part to form the clamping part. The crossbow curve part and the plane surrounding the adjacent arm form about ± 2. Angle. Between each coil and the crossbow part, an angle is formed between each of the arms to form a joint part. The arm is subjected to the tension of the wire, and the angle formed by the arm part in the bent part of each coil is about 127. ± 2❶. Each arm of the wire spring has a coil containing at least 3 turns. The angle formed between each arm and the two adjacent parts of each coil is greater than 90. It is preferable that the angle formed between the two parts of the arms adjacent to each line 'is about 132 ± 2. . The wire may have a cross-sectional diameter of about 1 mm. ^ The invention also provides-a tape or lead frame, and a tape including a plurality of wire bombs.

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The belt has a row of holes' which have parallel edges aligned with the edges of the belt and a close edge to accommodate the missing crossbows. The band has a row of parallel holes with an axis and band edges aligned in parallel, and a central portion near the band to accommodate the tip portions of the clips. In the clips of the belt, a portion of the arms of the coil phase may extend toward the edges of the belt approximately parallel to the web of the belt. In another feature of the present invention, an IC outfit plating system is provided, which includes: a plurality of process stations and a horizontal conveyor including a belt with a vertical net, and including a detachable misalignment finger, which can be based on the above-mentioned wire spring folder. The system may have a plurality of rollers located below the conveyor to support the 1 (:) package below. The system includes an automatic loading and unloading station, each including at least two rolls to feed and store 1C lead frame strips. Detailed description of the invention refers to® 30: 43, 41), the belt of the present invention has a plurality of clips 20 made of stainless copper 316 spring wire, and the design of the belt 10 ¾ is slightly different from that of the conventional conveyor belt 1 to adapt to the wire spring clip of the present invention. In one embodiment, each clip is formed of a stainless steel wire, and has a cross-sectional diameter of about 1 ππη. In the face 4a, the formed wire can provide a parallel arm of 2 commissions to 3mm, and the central part 22 from the substantially semicircular The extended 'central portion 22 forms about 117 with the corresponding arm portion. An angle to form a clamping portion 22, and the ends of each arm are angled to form an arm tip portion 23 that is approximately 5.5 mm long, and a coil 24 of approximately 3.5 inm radius is formed in each arm 21, which is close to the tip portion 23, The loop has approximately 3.5 turns. Each arm between each coil 24 and the central portion 22 is angled to form a joint portion 25 to allow the arm to withstand the tension of the coil, from the coil to the bent portion in the arm

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The length of the wire is about 13.7mm, and the length from the bent part of the cymbal to the clamping part is about 8m. The angular tolerance of the present invention is ± 2. The size is approximately ± 0.2 mm. The detachable future 2G can be supported on the belt 100 by inserting the tip portion 23 into a row of parallel holes 26 (take the upper portion of the belt 10G), and a plurality of parallel feces can be set under the belt 100 , Square or rectangular hole to hold the holding part 2 2 'grind each to turn part 2? Up and inward to withstand the tension of the line 圏 24' through the 墀 hole 2 7 to lean against the front of the belt, by By using a cam to press the bonding portion 25, the clamping portion 22 can be removed from the belt 100 to form a lead frame for receiving the component strip, and then the bonding portion 25 can be removed by pressing the bonding portion 25. This can be achieved manually. The leadframe or component strip conveyor belt of the present invention can be used in conjunction with a conventional p-full strip electroplating system (such as that of U.S. Patent No. 4,534,843). Reference is now made to circle 5 seal 9 to explain a special electroplating system according to the present invention. The present invention An electroplating system has been invented, including a plurality of modules or process stations using a module structure. FIG. 5 shows a single process station 30 according to an embodiment, a cover 31, a storage tank, and a supply pipe to burn the station 32. Provide liquid pan or gas pan, upper lid 3m provides openable lid 33 to release the control button, etc. The station itself can be a plating bath, covered with an openable mushroom 34, the lid 34 can be transparent or have a viewable The see-through portion 35 and the cover 34 are generally made of polypropylene, and a belt (not shown) for conveying the element strip passes through the side groove 36 and the station 32. The electric key system of the present invention has a plurality of such stations or similar process stations, including (but not limited to) at least one station can be executed, enlarged, electrically washed, anodized, the main water source is used for wetting, and the spray is used. Sprinkle and / or high-pressure spray of deionized water for all electrical degreasing, acid etching, welding keys

IHB ih " ^ 1-. 581829

V. Description of the invention (7), neutral, Lee air knife, drying, buffering, peeling, etc., can be added according to the desired process and product or replace other baths or stations. There is an autoloader at the + end of the station or module line, and the rain unloader at the one end. Circle 6 shows a partial section of the production line. A belt 1 输送 0 conveying a roll of lead frame 40 is horizontally suspended, while the belt net is vertical. Belt 100 rotates lead frame 40 by clamping 20, and lanthanum 5 shows 3 At least a part of the different stations, and the tape broadcasting sequence passes through the pre-drip processing station 41, the buffer station 42 and the electroplating process station 4a. In the present invention, the guide frame is not only supported by the belt clamp, but the I branch is above a plurality of spaced rollers 44 (only one is shown in circle 6). The height of the roller 44 can be changed by the cylinder actuator 4 & In order to adapt to different sizes of the lead frame, the system of this embodiment is used to support the lead frame on the top and bottom surfaces to ensure that there is no dripping even after long-term use & circles 7, 8 respectively show the automatic loading of the present invention and the driver The side view and front view of 50. The automatic implanter is equipped with a double roll system to continue to supply components to the belt 100. The roll A and roll B have their own roller system, which can be actuated by the compression cylinder 52. The tension roller 51 is tilted against the lead frame by the X and Y indexers 53 of the clamp 53a, and the position of the indexer $ 3 can be moved to pick up the lead frame from the roll A or pin B. The stud wire frame can also be loaded manually, provided with a height adjustment tape drive 54, and the manual lead frame 55 is loaded on top, and the tape drive 54 or the roll A and B upward indexer 56 supplies the lead frame strip, which An air gripper 57'58 is used to provide a lead frame strip to the opening fingers of the belt 100, which is driven by wheels 59 in a continuous loop manner, and a cam system (not shown) is used to automatically open the fingers.

Page 12 581829 窠 号 89123674 _Mou Yueri Chrome Zheng V. Description of the invention (8) At the other end of the continuous circuit with 100 is the unloading station, including the automatic roll-to-roll unloader 60, the drive wheel cooperates with the loader The wheels 59 of the SO are driven by the belt 100, and the lead frame strip is unloaded_62 to manually load the lead frame. The tension roller 63 driven by compressed air stores the lead frame strip sent from the conveyor via the roller 64. The unloading station also has The two roll systems A and 6 continue to unload the strips from the carousel via the roller 64 and the tension roller 63. The plating system of the present invention is suitable for strip-to-strip and roll-to-roll plating. The conveyor can support heavy packages or narrow-rail rod-shaped lead frames such as T0220 packages. The system performs operations such as welding and plating and fills various packages, such as DIP, SOLC, PLCC, QFP and TO devices. The autoloader supports 2 cassettes vertically to load the bar into the conveyor, and the lead frame can be supported from below and above by the roller. The spring clip device of the present invention has a clamping force comparable to that of a conventional wire clip, and has fewer point joints per bit length. The belt of the present invention provides a clamping force of about 300 g per clamping point. Compared with the 2 full turns of the conventional 槔 spring clip, the Ming spring clip has 3 full turns in each completed energy. The extra turns in the wire coil can increase the life of the clip by about 10%. The characteristic of the spring clip is the cross section of the wire arm_combination part. When the combination part is used, it cooperates with the clamp on the belt, and the big bow is parallel to the belt net, so that the clamp can be easily removed when replacing. Therefore, the spring clip of the present invention can increase the ease of maintenance. Although the actual examples of the present invention have been obtained, those skilled in the art can understand that various improvements can be made without departing from the scope of the present invention as defined in the appended patent application scope. In particular, it can be changed according to the size of the wire spring clip. angle.

581829 Cable number S9123674 Car plate Modification «Simplified description of the drawings Brief description of the drawings The invention will be described in detail below with reference to the portrayal diagrams and examples, where: 酺 1: It is a part of the stand 艟 according to the conventional ic strip conveyor. Circles 2a and 2b: Front and side views of a 1C leadframe conveyor belt and clip according to another example of conventional use ^ Circle 3a ·· Sideview and side view of a 1C leadframe conveyor belt and clip according to another example of conventional meaning front view. Circle 3b: Shows the side view and front view circle of the 1C lead frame conveyor belt clip according to the second example of circle 2. Figure 3c: shows a side view and a front view of a 1C leadframe conveyor belt and clip according to the present invention. Circles 4a, 4b: The front and side views of the 1C lead frame conveyor belt according to the present invention are shown, respectively. Circle 5: A three-dimensional circle showing a general process module forming part of a roll-to-roll or strip-to-strip processing system according to another feature of the present invention. Circle 6: is a partial side-view circle of the module system according to an embodiment. FIG. 7 is a view of a driver of a loading station according to an embodiment of the invention. Figure 8: Front view of the circle 7 drive. Figure 9: Front view of the unloading station according to one example embodiment. Pictorial description: Carousel belt-1 elastic misfit finger ------ 2 convex part __________ element belt-4 leaf spring -------- 5 hanging object _________ hanging object --- 6a product -------------- 7 spring means ________ 9-hole 10 test bend end _________ wire spring-a 12 crossbow central part --- 13 spring Coil _______ ΜΠΗ · 581829 [Case No. 89123674_Year Month Revised _ Schematic description of the vertical slot _ one; [5 tip one-one-one-16 single > wide end one,-11 clips- --- 2〇 Parallel arm --------- 21 Central (clamping) part-22 Tip part-23 Coil ----------- 24 Joint part ---- 25 Parallel hole one -艺 6 孔 ------------- 27 Belt ----- ^ ------ 100 Process Station——30 Cover ----------- 31 Station ------------- 32 cover ----- 33 cover ----------- 34 see-through section ------- 35 through side slot-- -3 ^ 6 lead frame --------- 40 processing station --------- 41 buffer station one-42 electroplating process station ----- 43 roller ------- ---- 44

Actuator --- 45 (loader) meal actuator-50 rolls ----------- A, B tension roller _51 compression cylinder ------- 52 indexer- ------ 53 pliers ------ 53a with driver ------- 54 lead frame --- 55 indexer ------- 56 cooler holder ---- -57, 58 Lufeng ----- 59 ^ Unloader ------ " 60 medium moving wheel ----------- ^ 61 tension roller-63 rate wheel -------- --- 64

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Claims (1)

~ Correction and amendment of the replacement _year f-89123R7A, which is the remarks VI. The scope of the patent application. The wire spring clip of the frame conveyor belt, the cool extension of the two arms, the U number of coils of each arm, bend Misconduct. The wire spring clip of item 1 of the n-month patent scope, the ^ ^ Λ f part is used to connect the clip to the lead frame conveyor belt. • A & wire spring clip of item 2 of the patent scope, 4 I = degree to form a tip portion of the arm with a network knot. • A wire spring clip of item 3 of the patent scope, which includes Partially adjacent planes form 90. • = The line of any one of items 1 to 4 of Shenyan's patent scope. The curved part can be formed with the plane, which includes the curved part ′ to form the clamping part. 6. The wire spring clip of item 5 in the scope of patent application, including the plane formation of adjacent arms, is 117 ± 2. Angle 7. As in any one of claims 1 to 4 of the scope of the patent application, each arm is angled between each coil and the bent portion to make the arm withstand the tension of the coil. 8. If the wire spring clip of item 7 of the patent application scope, the angle formed by the coil and the ridge part is 127. ± 2. 9. The wire of any one of items 1 to 4 of the patent application park. Each arm of the spring has a coil containing at least 3 turns. 10 · If one of the arms in any of the items 1 to 4 of the scope of the patent application is formed between the two adjacent parts of each coil, a part is formed in the formed spring clip. The ends of the arms are formed + the ends of the arms can be combined To support the clip. Each tip part can be at an angle of 2 °. Spring clip, in which the curved part and the package of the adjacent arm part. Wire spring clip, in which a joint is formed. The middle arm part is in each wire. 〇 Spring clip, where the wire spring clip, where the angle is greater than 90 ° ± Page 16 581829 K is the wire spring clip of item 10 of the patent application scope, in which the coil is adjacent to each coil, and the angle formed between the two parts of the arm is 132. ± 2. . • The wire spring clip according to any one of claims 1 to 4, wherein 13 has a cross-sectional diameter of lm®. • A carousel 1C or lead frame tape including a plurality of wire springs as in any one of the previously applied special scope items 1 to 12. • 1 Please refer to the belt of item 13 of the patent, where the belt has a row of holes An axis is aligned parallel to the edge of the band, and close to its side to accommodate the curved portion of the clip. 15.Ϊ: The belt of any one of the 13th or 14th of the patent scope, wherein the belt has a row of parallel holes with an axis aligned parallel to the edge of the belt, and close to the central portion of the belt net to receive the tip portion of the clip. •: The band for patent application No. 13 or 14, in which each clip I in the band, a part of each arm adjacent to the coil may extend toward the parallel to the band net. ΙΜΙΙ Page 17