CN219842967U - Bending prevention device of lead frame - Google Patents
Bending prevention device of lead frame Download PDFInfo
- Publication number
- CN219842967U CN219842967U CN202320371487.9U CN202320371487U CN219842967U CN 219842967 U CN219842967 U CN 219842967U CN 202320371487 U CN202320371487 U CN 202320371487U CN 219842967 U CN219842967 U CN 219842967U
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- China
- Prior art keywords
- lead frame
- magnetic
- bending prevention
- magnetic flux
- prevention device
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- 238000005452 bending Methods 0.000 title claims abstract description 25
- 230000002265 prevention Effects 0.000 title claims abstract description 19
- 230000005291 magnetic effect Effects 0.000 claims abstract description 98
- 230000004907 flux Effects 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000005484 gravity Effects 0.000 claims abstract description 18
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Lead Frames For Integrated Circuits (AREA)
Abstract
A bending prevention apparatus of a lead frame, comprising: the magnetic components are used for generating magnetic fields, magnetic flux passing through the lead frame continuously changes along with the transmission movement of the lead frame, and the direction of partial culture force generated by the lead frame under the change of the magnetic flux is opposite to the gravity direction of the lead frame. Since the position of the lead frame is continuously changed in the transmission process, the corresponding magnetic flux is also continuously changed, and according to Lenz's law, when the magnetic flux of the lead frame is changed, induced current which obstructs the change of the magnetic flux can be generated in the lead frame, so that partial ampere force which is correspondingly generated by the induced current is opposite to the gravity direction of the lead frame through arrangement, and the lead frame is effectively prevented from being bent due to the gravity.
Description
Technical Field
The utility model relates to the technical field of integrated circuit packaging, in particular to an anti-bending device of a lead frame.
Background
In the packaging process of the integrated circuit, the lead frame provides mechanical and electrical connection between the integrated circuit and the circuit board. Typically, to meet the functional requirements of die attach and soldering, it is necessary to plate a metal layer on the characteristic areas of the leadframe, such as the pedestals and pins. After the chip connection and the wire bonding are completed, the chip and the metal bonding wires are required to be packaged by using packaging materials, so that the internal structure is protected.
However, there are still problems with the current lead frames during the transfer process.
Disclosure of Invention
The utility model solves the technical problem of providing a bending-preventing device of a lead frame, so as to prevent the lead frame from bending in the transmission process.
In order to solve the above problems, the present utility model provides an anti-bending device for a lead frame, comprising: the magnetic components are used for generating magnetic fields, magnetic flux passing through the lead frame continuously changes along with the transmission movement of the lead frame, and the direction of partial culture force generated by the lead frame under the change of the magnetic flux is opposite to the gravity direction of the lead frame.
Optionally, the magnetic component is a permanent magnet.
Optionally, the magnetic component is an electromagnet structure.
Optionally, the magnetic assembly includes: an electromagnetic iron core; and the electromagnetic winding is wound on the surface of the electromagnetic iron core.
Optionally, the plurality of magnetic components are arranged at intervals along the direction of the transmission path of the lead frame.
Optionally, the method further comprises: and the controller is electrically connected with the magnetic assemblies respectively and used for controlling the starting and closing of the magnetic assemblies.
Optionally, the method further comprises: and the gap sensor is arranged between the adjacent magnetic assemblies and is electrically connected with the controller.
Optionally, the gap sensor includes: and an infrared sensor.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
the bending prevention device of the lead frame in the technical scheme of the utility model comprises: and the magnetic components are used for generating magnetic fields, the magnetic flux passing through the lead frame continuously changes along with the transmission movement of the lead frame, and the direction of partial ampere force generated by the lead frame under the change of the magnetic flux is opposite to the gravity direction of the lead frame. Since the position of the lead frame is continuously changed in the transmission process, the corresponding magnetic flux is also continuously changed, and according to Lenz's law, when the magnetic flux of the lead frame is changed, induced current which obstructs the change of the magnetic flux can be generated in the lead frame, so that partial ampere force which is correspondingly generated by the induced current is opposite to the gravity direction of the lead frame through arrangement, and the lead frame is effectively prevented from being bent due to the gravity.
Further, the method further comprises the following steps: and the gap sensor is arranged between the adjacent magnetic assemblies and is electrically connected with the controller. When the gap sensor detects that the lead frame reaches the corresponding area, the controller controls the corresponding magnetic component to be started, and when the gap sensor detects that the lead frame passes through the corresponding area, the controller controls the corresponding magnetic component to be closed, so that the energy-saving effect is achieved.
Drawings
Fig. 1 is a schematic view of a structure of a lead frame at the time of transfer;
fig. 2 is a schematic structural view of a bending prevention device of a lead frame according to an embodiment of the present utility model;
fig. 3 is a schematic structural view of a bending prevention device for a lead frame according to another embodiment of the present utility model.
Detailed Description
As described in the background, there are still many problems with the current lead frames during the transfer process. The following will make a detailed description with reference to the accompanying drawings.
Fig. 1 is a schematic view of a structure of a lead frame at the time of transfer.
At present, the lead frame is made of metal (such as iron, copper or aluminum), and part of the metal is soft, so that the lead frame can be removed during the stamping or etching process, and the weight of the lead frame can be increased during the electroplating process. Therefore, when the lead frame is transported, the lead frame is easily bent at the portion where the lead frame is supported and suspended (as shown in fig. 1) due to the problems of materials, structures, dead weights and the like, and then the lowest point of the bending is easily scratched, and the image recognition is affected.
On the basis, the utility model provides a bending prevention device of a lead frame, which comprises the following components: and the magnetic components are used for generating magnetic fields, the magnetic flux passing through the lead frame continuously changes along with the transmission movement of the lead frame, and the ampere force generated by the lead frame under the change of the magnetic flux is opposite to the gravity direction of the lead frame. Since the position of the lead frame is continuously changed in the transmission process, the corresponding magnetic flux is also continuously changed, and according to Lenz's law, when the magnetic flux of the lead frame is changed, induced current which obstructs the change of the magnetic flux can be generated in the lead frame, so that partial ampere force which is correspondingly generated by the induced current is opposite to the gravity direction of the lead frame through arrangement, and the lead frame is effectively prevented from being bent due to the gravity.
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Exemplary embodiments of the present utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Fig. 2 is a schematic structural view of a bending prevention device for a lead frame according to an embodiment of the present utility model.
Referring to fig. 2, a bending prevention device for a lead frame includes: a plurality of magnetic components 102, wherein the magnetic components 102 are used for generating a magnetic field, the magnetic flux passing through the lead frame 101 continuously changes along with the transmission movement of the lead frame 101, and the direction of ampere force generated by the lead frame 101 under the change of the magnetic flux is opposite to the gravity direction of the lead frame 101.
In this embodiment, since the position of the lead frame 101 is continuously changed during the transmission process, and the corresponding magnetic flux is also continuously changed, it is known from lenz's law that when the magnetic flux of the lead frame 101 is changed, an induced current that blocks the change of the magnetic flux is generated in the lead frame 101, so that a part of ampere force generated by the induced current is opposite to the gravity direction of the lead frame 101, thereby effectively preventing the lead frame 101 from being bent due to gravity.
In this embodiment, the magnetic component 102 is an electromagnet structure.
In other embodiments, the magnetic assembly 102 may also be a permanent magnet.
In this embodiment, the magnetic component 102 is disposed on the upper side of the lead frame 101.
In this embodiment, the magnetic components 102 are arranged at intervals along the direction of the transmission path of the lead frame 101.
In this embodiment, since the magnetic components 102 are disposed on the upper side of the lead frame 101, the magnetic field strength of the plurality of magnetic components 102 gradually decreases along the direction of the transmission path of the lead frame 101. Since the magnetic field strength of the magnetic component 102 is continuously reduced along with the transmission of the lead frame 101, the magnetic flux received by the lead frame 101 is also continuously reduced, and it is known from lenz's law that the magnetic field of the induced current generated in the lead frame 101 is required to block the change of the magnetic flux causing the induced current, and the ampere force generated by the induced current is required to block the magnetic flux of the lead frame 101 from continuously decreasing. The magnetic field strength of the magnetic component 102 continuously decreases with increasing distance, at this time, the closer the lead frame 101 is to the magnetic component 102, the stronger the magnetic field strength received by the lead frame 101 is, and the larger the magnetic flux correspondingly passes through the lead frame 101, so that at this time, a part of ampere force induced current will pull the lead frame 101 upwards to counteract a part of self gravity of the lead frame 101, thereby effectively preventing the lead frame 101 from bending due to gravity.
With continued reference to fig. 2, in this embodiment, the magnetic assembly 102 includes: an electromagnetic core 1021; and an electromagnetic winding 1022 wound around the surface of the electromagnetic core 1021.
In the present embodiment, it is known from the magnetic effect of the current that a magnetic field is generated around the electromagnetic winding 1022 after the current is applied, and the free atoms in the electromagnetic core 1021 are induced after the electromagnetic core 1021 is inserted into the electromagnetic winding 1022, so that the corresponding magnetic field strength is increased.
With continued reference to fig. 2, in this embodiment, the magnetic assembly 102 further includes: and the electromagnetic iron core 1021 is fixedly connected with the first supporting piece and the second supporting piece respectively.
In this embodiment, the electromagnetic core 1021 has a "U" shape.
With continued reference to fig. 2, in this embodiment, the method further includes: and the controller 103 is electrically connected with the magnetic assemblies 102 respectively and used for controlling the starting and closing of each magnetic assembly 102.
In this embodiment, further comprising: a gap sensor 104 disposed between adjacent magnetic assemblies 102, the gap sensor 104 being electrically connected to the controller 103.
In this embodiment, the controller 103 may set: when the gap sensor 104 detects that the lead frame 101 reaches the corresponding area, the controller 103 controls the corresponding magnetic component 102 to be started, and when the gap sensor 103 detects that the lead frame 101 passes the corresponding area, the controller 103 controls the corresponding magnetic component 102 to be closed, so that the energy-saving effect is achieved.
In this embodiment, the gap sensor 104 employs an infrared sensor.
Fig. 3 is a schematic structural view of a bending prevention device for a lead frame according to another embodiment of the present utility model.
In this embodiment, the description of the bending prevention device for the lead frame is continued based on the above embodiment, and the rest is the same as the above embodiment, except that: the magnetic assembly 102 is disposed on the underside of the leadframe 101. The following will make a detailed description with reference to the accompanying drawings.
Referring to fig. 3, the magnetic assembly 102 is disposed on the underside of the conveyor belt.
In this embodiment, since the magnetic components 102 are disposed on the lower side of the lead frame 101, the magnetic field strength of a plurality of the magnetic components 102 gradually increases along the direction of the transmission path of the lead frame 101. Since the magnetic field strength of the magnetic component 102 is continuously increased along with the transmission of the lead frame 101, the magnetic flux received by the lead frame 101 is also continuously increased, and it is known from lenz's law that the magnetic field of the induced current generated in the lead frame 101 is required to block the change of the magnetic flux causing the induced current, and the ampere force generated by the induced current is required to block the continuous increase of the magnetic flux of the lead frame 101. The magnetic field strength of the magnetic component 102 is continuously increased along with the increase of the distance, at this time, the more the lead frame 101 is far away from the magnetic component 102, the weaker the magnetic field strength received by the lead frame 101 is, and the smaller the magnetic flux correspondingly passing through the lead frame 101 is, so that at this time, part of ampere force induced current will pull the lead frame 101 upwards to counteract part of self gravity of the lead frame 101, thereby effectively preventing the lead frame 101 from bending due to gravity.
Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (8)
1. A bending prevention device of a lead frame, comprising:
the magnetic components are used for generating magnetic fields, magnetic flux passing through the lead frame continuously changes along with the transmission movement of the lead frame, and the direction of partial culture force generated by the lead frame under the change of the magnetic flux is opposite to the gravity direction of the lead frame.
2. The bending prevention apparatus according to claim 1, wherein the magnetic component is a permanent magnet.
3. The bending prevention device of a lead frame according to claim 1, wherein the magnetic component is an electromagnet structure.
4. The bending prevention apparatus of claim 3, wherein said magnetic assembly comprises: an electromagnetic iron core; and the electromagnetic winding is wound on the surface of the electromagnetic iron core.
5. The bending prevention apparatus according to claim 1, wherein a plurality of the magnetic components are arranged at intervals along a direction of a transmission path of the lead frame.
6. The bending prevention device of the lead frame according to claim 1, further comprising: and the controller is electrically connected with the magnetic assemblies respectively and used for controlling the starting and closing of the magnetic assemblies.
7. The bending prevention apparatus of a lead frame according to claim 6, further comprising: and the gap sensor is arranged between the adjacent magnetic assemblies and is electrically connected with the controller.
8. The bending prevention apparatus of a lead frame according to claim 7, wherein the gap sensor comprises: and an infrared sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320371487.9U CN219842967U (en) | 2023-02-27 | 2023-02-27 | Bending prevention device of lead frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320371487.9U CN219842967U (en) | 2023-02-27 | 2023-02-27 | Bending prevention device of lead frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219842967U true CN219842967U (en) | 2023-10-17 |
Family
ID=88305901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320371487.9U Active CN219842967U (en) | 2023-02-27 | 2023-02-27 | Bending prevention device of lead frame |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219842967U (en) |
-
2023
- 2023-02-27 CN CN202320371487.9U patent/CN219842967U/en active Active
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