CN112635424A

CN112635424A - Lead frame for chip packaging

Info

Publication number: CN112635424A
Application number: CN201910954475.7A
Authority: CN
Inventors: 王浩
Original assignee: Wuxi Xinkui Mechanical Equipment Co ltd
Current assignee: Wuxi Xinkui Mechanical Equipment Co ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2021-04-09

Abstract

The invention discloses a lead frame for chip packaging, in particular to the field of chip packaging, which comprises a lead frame integrated sheet and a lead frame, wherein the lead frame comprises a frame body, the side surface of the frame body is provided with a limiting groove, the inner side of the frame body is integrally formed with an outer leg, the end part of the outer leg is integrally formed with a connecting rib, the inner side of the frame body is integrally formed with a fixed leg, the side surface of the connecting rib is integrally formed with an inner leg, the top surface of the inner leg is provided with a first fixed hole, the end part of the fixed leg is integrally formed with a middle island, the top surface of the middle island is provided with a second fixed hole, and the top surface of the inner leg is bonded with a fixed adhesive tape. According to the invention, the lead frame integrated sheet is composed of a plurality of lead frames, and two connecting plates are connected between two adjacent lead frames, so that the lead frame integrated sheet with different quantities can be selected according to requirements, and the two lead frames are connected by using the connecting plates, so that the use quantity of materials can be reduced, the manufacturing cost is reduced, and the practicability of the equipment is increased.

Description

Lead frame for chip packaging

Technical Field

The invention relates to the technical field of chip packaging, in particular to a lead frame for chip packaging.

Background

The lead frame is used as a chip carrier of an integrated circuit, is a key structural member for realizing the electrical connection between a lead-out end of an internal circuit of a chip and an external lead by means of a bonding material to form an electrical circuit, plays a role of a bridge connected with an external lead, needs to be used in most semiconductor integrated blocks, and is an important basic material in the electronic information industry.

The packaging process comprises the steps of fixing a gold layer or a silver layer on the back surface of a product sheet at the central part with a gold-plated layer at the center of a foot rest by using a high-temperature welding method, then routing and communicating gold wires or aluminum wires between electrode points of a welded and fixed wafer and pins, then firmly sealing the whole main body by using plastic or glass, cutting off the outer frame of the foot rest, further bending the pins to form so as to facilitate insertion welding or sticking welding, and obtaining the required elements.

In addition, the existing lead frame directly fixes the chip on the middle island of the lead frame, so that the chip can be dropped in the processing process.

Therefore, it is desirable to provide a lead frame with stable chip fixing and low production cost.

Disclosure of Invention

In order to overcome the above-mentioned defects in the prior art, embodiments of the present invention provide a lead frame for chip packaging, which can be connected by a connection board to reduce the number of materials used and the manufacturing cost, and through the action of the second fixing hole, the device can stably fix a chip, so that the chip is prevented from falling off from the surface of the middle island due to shaking of the device during use, and the problems in the background art are solved.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a lead frame for chip package, includes lead frame integrated chip and lead frame, the lead frame includes the framework, the spacing groove has been seted up to the side of framework, the inboard integrated into one piece of framework has outer leg, the tip integrated into one piece of outer leg has even muscle, the inboard integrated into one piece of framework has the fixed leg, the side integrated into one piece of even muscle has the inner leg, first fixed orifices has been seted up to the top surface of inner leg, the tip integrated into one piece of fixed leg has the middle part island, the second fixed orifices has been seted up to the top surface of middle part island, the top surface of inner leg bonds and has the fixed sticky tape, the side integrated into one piece of lead frame has the connecting plate, the separating tank has been seted up to the upper and lower two sides of connecting plate.

In a preferred embodiment, the lead frame integrated sheet is composed of a plurality of lead frames, and two connecting plates are connected between two adjacent lead frames.

In a preferred embodiment, the number of the limiting grooves is four, and the limiting grooves are uniformly distributed on the front side surface and the rear side surface of the lead frame.

In a preferred embodiment, the number of the outer legs corresponds to the number of the inner legs, and each outer leg corresponds to the position of one inner leg on the other side of the connecting rib.

In a preferred embodiment, the first fixing hole is located near the top surface of the inner leg of the rim.

In a preferred embodiment, the second fixing hole is located on the top surface of the middle island.

In a preferred embodiment, the fixing adhesive tapes are positioned on the top surfaces of the inner legs at two sides of the middle island.

In a preferred embodiment, the separation grooves are located on the upper and lower surfaces of both ends of the connection plate, and the depth of the separation grooves is one eighth of the thickness of the connection plate.

The invention has the technical effects and advantages that:

1. according to the invention, the lead frame integrated sheet is composed of a plurality of lead frames, and two connecting plates are connected between two adjacent lead frames, so that the lead frame integrated sheet with different quantities can be selected according to the requirement, and the two lead frames are connected by using the connecting plates, so that the use quantity of materials can be reduced, the manufacturing cost is reduced, and the practicability of the equipment is increased;

2. according to the invention, the four limiting grooves are uniformly distributed on the front side and the rear side of the lead frame, so that the lead frame can be fixed through the four limiting grooves on the sides of the lead frame when in use, and the damage of the lead frame when in use due to the fact that the position cannot be fixed is avoided, thereby increasing the use cost and increasing the practicability of the equipment;

3. according to the invention, the number of the outer legs corresponds to that of the inner legs, and each outer leg corresponds to the position of one inner leg on the other side surface of the connecting rib, so that each inner leg corresponds to one outer leg after the rib is cut on the equipment, the phenomenon that the equipment cannot work normally due to the fact that the positions of the outer legs and the inner legs do not correspond is avoided, and the practicability of the equipment is increased.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a schematic diagram of a single lead frame structure of the present invention.

FIG. 4 is a schematic view of the structure of FIG. 1A according to the present invention.

FIG. 5 is a schematic view of the structure at B of FIG. 2 according to the present invention.

The reference signs are: 1. a lead frame integrated sheet; 2. a lead frame; 21. a frame body; 22. a limiting groove; 23. an outer leg; 24. connecting the ribs; 25. a fixed leg; 26. an inner leg; 261. a first fixing hole; 27. a middle island; 271. a second fixing hole; 28. fixing the adhesive tape; 3. a connecting plate; 31. and (4) a separation groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The lead frame for chip packaging as shown in fig. 1-5 comprises a lead frame integrated sheet 1 and a lead frame 2, wherein the lead frame 2 comprises a frame body 21, a limiting groove 22 is formed in the side surface of the frame body 21, an outer leg 23 is integrally formed in the inner side of the frame body 21, a connecting rib 24 is integrally formed at the end part of the outer leg 23, a fixing leg 25 is integrally formed in the inner side of the frame body 21, an inner leg 26 is integrally formed in the side surface of the connecting rib 24, a first fixing hole 261 is formed in the top surface of the inner leg 26, a middle island 27 is integrally formed at the end part of the fixing leg 25, a second fixing hole 271 is formed in the top surface of the middle island 27, a fixing tape 28 is bonded on the top surface of the inner leg 26, a connecting plate 3 is integrally formed in the side surface of the lead frame 2.

Referring to the attached figures 1-2 of the specification: the lead frame integrated chip 1 is composed of a plurality of lead frames 2, and two connecting plates 3 are connected between two adjacent lead frames 2.

Referring to the description of figure 3: the number of the limiting grooves 22 is four, and the limiting grooves are uniformly distributed on the front side surface and the rear side surface of the lead frame 2.

Referring to the description of figure 3: the number of outer legs 23 corresponds to the number of inner legs 26, and each outer leg 23 corresponds to the position of one inner leg 26 at the other side of the tie bar 24.

Referring to the description of figure 3: the first fixing hole 261 is located near the top surface of the rim inner leg 26.

The specific implementation mode is as follows: through having set up first fixed orifices 261 and being located the top surface that is close to marginal inner leg 26, realized can make that the resin can be fixed more firm through setting up of first fixed orifices 261 when encapsulating lead frame 2, avoided breaking away from with equipment because of fixed unstable resin that appears, cause equipment to damage, increased the practicality of equipment.

Referring to the description of figure 3: the second fixing hole 271 is located on the top surface of the middle island 27.

The specific implementation mode is as follows: through having set up the top surface that second fixed orifices 271 is located middle part island 27, realized can be through the effect of second fixed orifices 271 for equipment can be with the stable fixed of chip, has avoided shaking the surface that appears the chip from middle part island 27 and has come off because of equipment when using, has increased the stability of equipment.

Referring to the description of figure 3: the securing tape 28 is located on the top surface of the inner leg 26 on either side of the central island 27.

The specific implementation mode is as follows: through having set up the top surface that sticky tape 28 is located leg 26 in middle part island 27 both sides, realized because the inner leg 26 of middle part island 27 both sides is the longest, so leg 26 warp easily appears, can effectually avoid leg 26 to appear warping after using sticky tape 28 to fix inner leg 26, increased the practicality of equipment.

Referring to the description figures 1-2 and 4-5: the separating grooves 31 are positioned on the upper and lower surfaces of both ends of the connecting plate 3, and the depth of the separating grooves 31 is one eighth of the thickness of the connecting plate 3.

The specific implementation mode is as follows: through having set up the upper and lower two sides that separation tank 31 is located connecting plate 3 both ends, and the degree of depth of separation tank 31 is one eighth of 3 thickness of connecting plate, has realized that can be more convenient parts two adjacent lead frame 2, has increased the practicality of equipment.

The working principle is as follows:

a preparation stage: the equipment is first transported to the place of use and then installed into the operating equipment.

The working stage is as follows: firstly, under the action of an operating device, the adjacent lead frames 2 are separated, then silver liquid is coated on the surface of the middle island 27, then the chip is pressed on the surface of the middle island 27, then the chip is connected with the end part of the inner leg 26 by a lead, then the middle part of the device is covered by resin, then the device is subjected to rib cutting, and then the outer leg 23 is bent into a preset shape.

And (5) finishing: firstly, the processed equipment is packaged in a centralized way, and then the equipment is transported to a designated place.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;

and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims

1. A lead frame for chip packaging, comprising a lead frame integrated chip (1) and a lead frame (2), characterized in that: the lead frame (2) comprises a frame body (21), a limit groove (22) is arranged on the side surface of the frame body (21), an outer leg (23) is integrally formed on the inner side of the frame body (21), a connecting rib (24) is integrally formed at the end part of the outer leg (23), the inner side of the frame body (21) is integrally formed with a fixed leg (25), the side surface of the connecting rib (24) is integrally formed with an inner leg (26), the top surface of the inner leg (26) is provided with a first fixing hole (261), the end part of the fixing leg (25) is integrally formed with a middle island (27), the top surface of the middle island (27) is provided with a second fixing hole (271), the top surface of the inner leg (26) is bonded with a fixing adhesive tape (28), the side face of the lead frame (2) is integrally formed with a connecting plate (3), and separating grooves (31) are formed in the upper face and the lower face of the connecting plate (3).

2. The lead frame for chip packaging according to claim 1, wherein: the lead frame integrated chip (1) is composed of a plurality of lead frames (2), and two connecting plates (3) are connected between every two adjacent lead frames (2).

3. The lead frame for chip packaging according to claim 1, wherein: the number of the limiting grooves (22) is four, and the limiting grooves are uniformly distributed on the front side face and the rear side face of the lead frame (2).

4. The lead frame for chip packaging according to claim 1, wherein: the number of the outer legs (23) corresponds to the number of the inner legs (26), and each outer leg (23) corresponds to the position of one inner leg (26) on the other side face of the connecting rib (24).

5. The lead frame for chip packaging according to claim 1, wherein: the first securing aperture (261) is located proximate to a top surface of the marginal inner leg (26).

6. The lead frame for chip packaging according to claim 1, wherein: the second fixing hole (271) is positioned on the top surface of the middle island (27).

7. The lead frame for chip packaging according to claim 1, wherein: the fixing adhesive tape (28) is positioned on the top surfaces of the inner legs (26) at two sides of the middle island (27).

8. The lead frame for chip packaging according to claim 1, wherein: the separating grooves (31) are positioned on the upper surface and the lower surface of the two ends of the connecting plate (3), and the depth of the separating grooves (31) is one eighth of the thickness of the connecting plate (3).