CN217426733U

CN217426733U - clip copper sheet and strip

Info

Publication number: CN217426733U
Application number: CN202220649710.7U
Authority: CN
Inventors: 潘龙慧; 付巍巍; 王李发; 李勇
Original assignee: Ningbo Dezhou Precision Electronic Co ltd
Current assignee: Ningbo Dezhou Precision Electronic Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-09-13
Anticipated expiration: 2032-03-23

Abstract

The utility model provides a clip copper sheet and strip, including the copper sheet body, the both ends of copper sheet body are provided with first connecting portion and the second connecting portion that are used for respectively being connected with chip and lead wire frame line, copper sheet body middle part is provided with the changeover portion with first connecting portion and/or second connecting portion parallel and level, be provided with the cross-over bridge between changeover portion and first connecting portion and the second connecting portion respectively, two changeover bridges upwards protruding and with first connecting portion or second connecting portion dislocation arrangement. The two transition bridges are arranged in the scheme, so that the span length of the transition bridges can be shortened, the transition bridges form a structure similar to a convex rib instead of a plane structure, and meanwhile, a groove structure is formed between the two transition bridges, and a plastic part can be clamped at the groove structure to prevent the clip copper sheet from dislocating during injection molding.

Description

clip copper sheet and strip

Technical Field

The utility model relates to a wiring structure of semiconductor chip lead frame especially relates to a clip copper sheet and strip.

Background

The lead frame is a carrier for providing mechanical support for the chip, and the lead frame serves as a conductive medium to play a role of a bridge for connecting the chip with an external wire. The lead frame and the packaging shell together emit heat generated by the chip during working to the outside to form a heat radiation channel. Lead frames, which are important basic materials in the electronic information industry, are required in most of the semiconductor integrated blocks. The lead frame has the functions of bearing the chip, connecting the internal chip with an external circuit board for electric signals, installing and fixing electronic devices and the like. The clip copper sheet is a bridging structure for connecting the lead frame and the chip, and replaces a standard lead bonding mode between the chip and the lead to a certain extent, so that a unique packaging resistance value, higher current magnitude and better heat-conducting property can be obtained.

Chinese patent CN114156253A discloses a clip copper sheet and a strip, the scheme includes a plate-shaped copper sheet body, wherein two ends of the copper sheet body are provided with connecting parts and are respectively connected with chip contacts and lead frame contacts, part of the plate between the two connecting parts protrudes upwards to form a transition bridge structure, the transition bridge structure is used for preventing the contact between the copper sheet body and other components, however, the chip contacts and the lead frame contacts are possibly far apart, the transition bridge structure with larger spanning distance is weaker in strength and is easy to break, and the lead frame and the chip therein need to be subjected to injection molding packaging treatment, the stitch of the lead frame is left outside the injection molding square block and then is bent, a pulling force is formed on the stitch in the bending process to pull the stitch, meanwhile, the metal piece and the plastic are not tightly attached, the pulling of the pins can be transmitted to the clip copper sheet, and then the clip copper is misplaced and disconnected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a clip copper sheet and strip for solve the lower and easy problem of dislocating of clip copper sheet structural strength.

The clip copper sheet comprises a copper sheet body, wherein a first connecting portion and a second connecting portion which are respectively used for being connected with a chip and a lead frame line are arranged at two ends of the copper sheet body, a transition section which is parallel to the first connecting portion and/or the second connecting portion is arranged in the middle of the copper sheet body, transition bridges are respectively arranged between the transition section and the first connecting portion and between the transition section and the second connecting portion, and the two transition bridges are upwards protruded and are arranged in a staggered mode with the first connecting portion or the second connecting portion.

The two transition bridges are arranged in the scheme, so that the crossing length of the transition bridges can be shortened, and the transition bridges form a structure similar to a convex rib instead of a plane structure. Meanwhile, a groove structure is formed between the two transition bridges, and a plastic part can be clamped at the groove structure to prevent the clip copper sheet from dislocating when injection molding is carried out.

Preferably, two sides of the transition bridge are extended with connecting pins, the connecting pins are provided with cutting positions, and the cutting positions and the side edges of the transition bridge are arranged at intervals.

Preferably, the first and second connecting portions are flush.

Preferably, the first connecting portion and the second connecting portion are provided with U-shaped openings.

Preferably, a strip-shaped hole is formed in the transition bridge, and the length square of the strip-shaped hole is parallel to the opening direction of the U-shaped opening.

The containing strip comprises a strip body, wherein mounting holes are arranged in an array on the strip body, the mounting holes are connected with the clip copper sheet, and the copper sheet body is connected with the mounting holes through connecting pins.

Preferably, protruding pieces are arranged on two sides of the tape body in the length direction, the protruding direction of each protruding piece is consistent with the protruding direction of the copper sheet body relative to the tape body, and the protruding height of each protruding piece is larger than that of the copper sheet body.

Preferably, the lug is arranged in the punched hole, one end of the lug is connected with the hole edge of the punched hole, and the lug is in a right-angle folded plate structure.

Preferably, the punching hole is provided with a process notch at the position close to the hole edge of the suspension end of the lug.

Preferably, the belt body is arranged in a furled shape, one side surface of the belt body close to the furled axis is a burr surface, and the protruding piece and the copper sheet body protrude towards the furled axis.

Drawings

FIG. 1 is a schematic structural diagram of a clip copper sheet;

FIG. 2 is a schematic cross-sectional view of a clip copper sheet;

FIG. 3 is a schematic view of the structure of the strip;

FIG. 4 is an enlarged view of the portion A of FIG. 3;

FIG. 5 is a cross-sectional view of a tab;

FIG. 6 is a schematic view of the rolled-up state of the tape;

description of reference numerals: 10. a copper sheet body; 11. a first connection portion; 12. a second connecting portion; 13. a transition section; 14. a transition bridge; 15. a connecting pin; 151. a cutting-off position; 16. a U-shaped opening; 17. a strip-shaped hole; 20. a belt body; 21. mounting holes; 22. a tab; 23. punching a hole; 231. a process gap; 24. burred surface; 30. and (5) winding the axis.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be noted that the terms "bottom", "outside", "front and back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the using state of the sole, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

As shown in fig. 2, a clip copper sheet includes a copper sheet body 10, a first connection portion 11 and a second connection portion 12, which are used for being connected to a chip and a lead frame line, are disposed at two ends of the copper sheet body 10, a transition section 13, which is flush with the first connection portion 11 and/or the second connection portion 12, is disposed in the middle of the copper sheet body 10, transition bridges 14 are disposed between the transition section 13 and the first connection portion 11 and/or the second connection portion 12, and the two transition bridges 14 protrude upward and are arranged in a staggered manner with the first connection portion 11 or the second connection portion 12.

Two transition bridges 14 are arranged in the scheme, the two transition bridges 14 are short in size in the connecting direction, a structure similar to a convex rib is formed, the structural strength of the convex rib is high, and the position of the transition bridge 14 cannot be broken even if the copper sheet body 10 is pulled. When the stitch that bends is moulded plastics to the completion, can form a pulling force along stitch length direction to the stitch, this pulling force transmits to copper sheet body 10 department along the stitch, and because formed the recess between two transition bridges 14, the working of plastics just can fill into in the recess during moulding plastics, and the cell wall place face of recess is perpendicular with the pulling force direction, can effectively utilize the joint power between working of plastics and the recess to overcome the pulling force like this and not rely on the adhesive force between the two, effectively prevent clip copper sheet dislocation like this.

As shown in fig. 1, connecting legs 15 are cantilevered from both sides of the transition bridge 14, a cutting position 151 is disposed on the connecting legs 15, and the cutting position 151 is spaced apart from the side edges of the transition bridge 14. Like this with copper sheet body 10 can be connected with the carrier through connecting foot 15, have partial connection foot 15 to remain at copper sheet body 10 when cutting off connection foot 15 and carrier separation, one avoids cutting the position apart from copper sheet body 10 too closely to cause the destruction of copper sheet body, and it is fixed with the material formation joint of moulding plastics to utilize remaining connection foot 15.

As shown in fig. 2, the first connecting portion 11 and the second connecting portion 12 are flush. This facilitates the connection of chip contacts and leadframe contacts that are arranged at equal heights.

As shown in fig. 1, the first connecting portion 11 and the second connecting portion 12 are provided with U-shaped openings 16. Because the copper sheet body 10 usually contacts with the plane through the bonding of conducting resin, and too big or too much conducting resin of the contact surface of the copper sheet body 10 just leads to the conducting resin can't extrude from between copper sheet body 10 and the contact, the copper sheet body 10 just easily takes place to slide on the conducting resin and leads to connecting the dislocation or even fail, influences the connection precision. The U-shaped opening 16 can divide the connecting surface, so that the conductive adhesive can be extruded to the U-shaped opening 16 in time, and the conductive adhesive can form limit matching with the U-shaped opening 16 after being solidified.

As shown in fig. 1, a strip-shaped hole 17 is formed in the transition bridge 14, and the length of the strip-shaped hole 17 is square and parallel to the opening direction of the U-shaped opening 16. Part working of plastics just can fill in bar hole 17 when moulding plastics like this and form the bar post structure, because have the tensile joint structure of sufficient overcoming the direction of connection on the copper sheet body 10, consequently set up bar hole 17 direction unanimous with the direction of connection, the longer pore wall in bar hole just can form the joint force of perpendicular to direction of connection like this.

As shown in FIG. 3, the contained strip comprises a strip body 20, wherein mounting holes 21 are arranged on the strip body 20 in an array mode, the mounting holes 21 are connected with the clip copper sheet, and the copper sheet body 10 is connected with the mounting holes 21 through connecting pins 15. In the above scheme, the tape body 20 is a carrier of the copper sheet body 10, and the copper sheet body 10 is punched on a flat copper tape during processing, and then the copper sheet body 10 is separated for use.

Preferably, protruding pieces 22 are arranged on two sides of the tape body 20 in the length direction, the protruding direction of the protruding pieces 22 is consistent with the protruding direction of the copper sheet body 10 relative to the tape body 20, and the protruding height of the protruding pieces 22 is greater than the protruding height of the copper sheet body 10. Generally, the tape 20 needs to be rolled up for storage or transportation, if the copper sheet body 10 directly contacts the surface of the adjacent tape 20, which is likely to cause damage to the copper sheet body 10, the protruding piece 22 is disposed, and the protruding piece 22 will contact the surface of the tape 20 before the copper sheet body 10 contacts the surface of the tape 20, so as to prevent the copper sheet body 10 from being squeezed during rolling up for storage.

As shown in fig. 5, the tab 22 is disposed in the punched hole 23, one end of the tab 22 is engaged with the hole edge of the punched hole 23, and the tab 22 has a right-angled flap structure. According to the scheme, the punching hole 23 is formed in the original flat belt body 20 through punching, part of materials in the original punching hole 23 can be warped to form the protruding piece 22, and the protruding piece 22 in the right-angle folded plate-shaped structure can guarantee the structural strength and prevent the copper sheet body 10 from being touched with the surface of the belt body 20 due to excessive compression when the protruding piece 22 is in surface contact with the surface of the belt body 20 after being rolled.

As shown in fig. 4, a process notch 231 is formed at the position of the punching hole 23 adjacent to the hole edge of the suspension end of the lug 22. Since the protruding tab 22 is directly punched out from the punching hole 23, the overhanging end of the protruding tab 22 and the hole edge of the punching hole 23 are easily torn, so that the process notch 231 is provided to prevent the tearing by punching, and the process notches 231 can be asymmetrically arranged, which facilitates the identification of the front and back sides of the position of the protruding tab 22.

As shown in fig. 6, the belt body 20 is disposed in a winding shape, one side of the belt body 20 close to the winding axis 30 is a burr surface 24, and the protruding direction of the protruding piece 22 and the copper sheet body 10 faces the winding axis 30. When the clip copper sheet is used, the lower surface of the copper sheet body 10 needs to be attached to the chip, so that the burr surface 24 of the strip can be prevented from contacting the chip when the strip is used.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims

1. The utility model provides a clip copper sheet, includes copper sheet body (10), the both ends of copper sheet body (10) are provided with first connecting portion (11) and second connecting portion (12) that are used for being connected with chip and lead wire frame line respectively, its characterized in that: the copper sheet body (10) middle part is provided with transition section (13) with first connecting portion (11) and/or second connecting portion (12) parallel and level, be provided with respectively between transition section (13) and first connecting portion (11) and second connecting portion (12) and cross bridge (14), two cross bridge (14) upwards protruding and with first connecting portion (11) or second connecting portion (12) dislocation arrangement.

2. The clip copper sheet of claim 1, wherein: two sides of the transition bridge (14) are extended with connecting pins (15), the connecting pins (15) are provided with cutting positions (151), and the cutting positions (151) and the side edges of the transition bridge (14) are arranged at intervals.

3. The clip copper sheet of claim 2, wherein: the first connecting portion (11) and the second connecting portion (12) are flush.

4. The clip copper sheet of claim 3, wherein: the first connecting part (11) and the second connecting part (12) are provided with U-shaped openings (16).

5. The clip copper sheet of claim 4, wherein: a strip-shaped hole (17) is formed in the transition bridge (14), and the length of the strip-shaped hole (17) is square and parallel to the opening direction of the U-shaped opening (16).

6. A strip comprising the clip copper sheet of claim 2 or 3 or 4 or 5, which comprises a strip body (20), wherein the strip body (20) is provided with mounting holes (21) in an array, the mounting holes (21) are connected with the clip copper sheet of any one of claims 2 to 5, and the copper sheet body (10) is connected with the mounting holes (21) through connecting pins (15).

7. The strip according to claim 6, wherein: protruding pieces (22) are arranged on two sides of the tape body (20) in the length direction, the protruding direction of each protruding piece (22) is consistent with the protruding direction of the copper sheet body (10) relative to the tape body (20), and the protruding height of each protruding piece (22) is larger than that of the copper sheet body (10).

8. The strip according to claim 7, wherein: the lug (22) is arranged in the punching hole (23), one end of the lug (22) is connected with the hole edge of the punching hole (23), and the lug (22) is of a right-angle folded plate-shaped structure.

9. The strip according to claim 8, wherein: and a process notch (231) is formed in the position, close to the hole edge of the suspension end of the lug (22), of the stamping hole (23).

10. The strip according to claim 9, wherein: the band body (20) is arranged in a furled mode, one side face, close to the furled axle center (30), of the band body (20) is a burr face (24), and the protruding pieces (22) and the protruding direction of the copper sheet body (10) face the furled axle center (30).