CN110576477B

CN110576477B - Punching cutting die

Info

Publication number: CN110576477B
Application number: CN201910920804.6A
Authority: CN
Inventors: 汪家国
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-06-22
Anticipated expiration: 2039-09-27
Also published as: CN110576477A

Abstract

The utility model provides a die-cut cutting die, die-cut cutting die includes the cutting die main part, the top of cutting die main part is provided with the die-cut face of constituteing by a plurality of sawtooth for die-cut cover brilliant film, cover brilliant film's pressfitting end distributes and has a plurality of terminals that switch on of arranging in proper order. The beneficial effects of this revelation do: the die-cut face composed of a plurality of sawteeth is arranged at the top of the knife die main body of the die-cut knife die and used for die-cutting the chip on film, so that the distance between two adjacent conducting terminals after die-cutting is increased, the short circuit risk caused by residual metal foreign matters is reduced, and the poor lamination end of the chip on film is avoided.

Description

Punching cutting die

Technical Field

The disclosure relates to the technical field of display, in particular to a punching cutting die.

Background

As shown in fig. 1, which is a schematic cross-sectional structure diagram of a conventional die-cutting die 100, for a Chip On Film (COF) laminated product, since the supplied materials of all the COF 10 are generally coiled materials, the conventional die-cutting die 100 is usually required to be die-cut into a required shape, and the die-cut surface of the conventional die-cutting die 100 is smooth and flat.

As shown in fig. 2, which is a schematic cross-sectional structure diagram of the flip-chip film 10 punched by using the conventional punching die 100, generally, a distance between two adjacent conducting terminals 11 disposed at the pressing end of the flip-chip film 10 is relatively narrow, and is usually smaller than 12um, because the conducting terminals 11 are made of copper metal material, when the conventional punching die 100 is used for punching, a metal foreign object 22 generally remains at the end of the conducting terminal 10, and the metal foreign object 22 is prone to cause a short circuit between two adjacent conducting terminals 11, which causes the pressing end of the flip-chip film 10 to generate a defect, thereby affecting the performance of the flip-chip film 10.

In view of the above, it is desirable to provide a new punching die to solve the above technical problems.

Disclosure of Invention

The disclosure provides a punching cutting die, which solves the technical problem that after the existing punching cutting die punches a chip on film, metal foreign matters remained at the tail ends of conducting terminals easily cause short circuit between two adjacent conducting terminals, so that the pressing end of the chip on film generates bad.

In order to solve the above problems, the technical solution provided by the present disclosure is as follows:

the embodiment of the disclosure provides a punching cutting die, which comprises a cutting die main body, wherein a punching surface consisting of a plurality of sawteeth is arranged at the top of the cutting die main body and used for punching a chip on film, and a plurality of sequentially arranged conduction terminals are distributed at the pressing end of the chip on film.

According to the punching cutting die provided by the embodiment of the disclosure, the sawteeth are provided with the first edge and the second edge on the punching surface, the first edge and the second edge are intersected to form the tooth tips of the sawteeth, a groove is formed between every two adjacent sawteeth, and the grooves correspond to the conduction terminals one by one.

According to the punching die provided by the embodiment of the disclosure, the first edge and the second edge are both convex arcs, or the first edge and the second edge are both straight lines.

According to the punching die provided by the embodiment of the disclosure, the first edge and the second edge are symmetrically arranged along a first direction, wherein the first direction is the direction of the central axis of the saw tooth, and the tooth tip is located on the central axis of the saw tooth.

According to the punching cutter die provided by the embodiment of the disclosure, the central axis of the saw tooth is coincident with the central axis between two adjacent conduction terminals.

According to the punching cutter die provided by the embodiment of the disclosure, the distance between one end of the first edge far away from the tooth tip and one end of the second edge far away from the tooth tip in the second direction is equal to the distance between the center lines of two adjacent conduction terminals along the second direction;

wherein the second direction is perpendicular to the first direction.

According to the punching die provided by the embodiment of the disclosure, the maximum distance between the first edge and the second edge in the second direction is 100 um.

According to the punching cutter die provided by the embodiment of the disclosure, the first edge and the second edge are provided with wave-shaped stripes.

According to the punching cutting die provided by the embodiment of the disclosure, the material of the conduction terminal is copper metal.

According to the punching cutter die provided by the embodiment of the disclosure, the material of the punching cutter die is tungsten steel.

The beneficial effects of this revelation do: according to the punching cutting die, the punching face composed of the plurality of sawteeth is arranged at the top of the cutting die main body of the punching cutting die and used for punching the chip on film, so that the distance between two adjacent conducted terminals after punching is increased, the short circuit risk caused by residual metal foreign matters is reduced, and the defect of the lamination end of the chip on film is avoided.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some of the disclosed embodiments, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic cross-sectional structure view of a conventional piercing die of the prior art.

FIG. 2 is a schematic cross-sectional view of a flip-chip film die-cut by the conventional die-cutting die shown in FIG. 1;

fig. 3 is a schematic cross-sectional structure diagram of a flip chip on film before die cutting according to an embodiment of the disclosure;

fig. 4 is a schematic cross-sectional view illustrating a punching die according to an embodiment of the disclosure;

FIG. 5 is a schematic cross-sectional view of the flip-chip film die-cut by the die-cutting die shown in FIG. 4;

fig. 6 is a schematic cross-sectional view of another embodiment of a piercing die according to the present disclosure;

fig. 7 is a schematic cross-sectional structure view of the flip chip film die-cut by the die-cutting die in fig. 6.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the disclosure may be practiced. Directional phrases used in this disclosure, such as [ upper ], [ lower ], [ front ], [ back ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terms used are used for the purpose of illustration and understanding of the present disclosure, and are not used to limit the present disclosure. In the drawings, elements having similar structures are denoted by the same reference numerals.

After the flip chip is punched by the punching cutter die in the prior art, a metal foreign matter generally remains at the tail end of the conduction terminal, and the metal foreign matter easily causes short circuit between two adjacent conduction terminals, so that the flip chip pressing end is poor.

As shown in fig. 3, which is a schematic cross-sectional structure of the flip chip film 20 before die cutting according to the embodiment of the present disclosure, a plurality of sequentially arranged conduction terminals 21 are distributed at a press-fit end of the flip chip film 20, each of the conduction terminals 21 has the same shape and size, and a distance between every two adjacent conduction terminals 21 is equal, in the embodiment of the present disclosure, the conduction terminals 21 before die cutting have a rectangular shape.

As shown in fig. 4, which is a schematic cross-sectional structure view of a die-cutting die 200 according to an embodiment of the present disclosure, the die-cutting die 200 includes a die main body 201, and a die-cutting surface formed by a plurality of saw teeth 202 is disposed on a top of the die main body 201 for die-cutting the chip on film 20.

Specifically, each of the saw teeth 202 has a first side 2021 and a second side 2022 on the punching surface, and the first side 2021 and the second side 2022 intersect to form a tooth tip D of the saw tooth 202, in the embodiment of the present disclosure, the first side 2021 and the second side 2022 are symmetrically arranged along the first direction y, so that the tooth tip D is located on the central axis a of the saw tooth 202, so that the shape and the size of each of the conduction terminals 21 punched by the punching blade die 200 are kept the same.

A groove 203 is formed between every two adjacent sawteeth 202, the groove 203 is V-shaped, and the grooves 203 correspond to the conduction terminals 21 one by one, so that the number of the grooves 203 is equal to the number of the conduction terminals 21. It can be understood that the tooth tips D extend into the gap formed by the ends of every two adjacent conductive terminals 21, and the punching plane punches off partial areas located at both sides of the ends of the conductive terminals 21, as shown in fig. 5, which is a schematic cross-sectional structure of the flip-chip film 20 punched by using the punching die 200, and a pointed-angle-shaped structure is formed at the ends of the conductive terminals 21, and preferably, the tooth tips D extend into the center line b between every two adjacent conductive terminals 21, so that the ends of the conductive terminals 21 are in a symmetrical structure.

It should be noted that, if the first direction y is a direction of a central axis a of the saw tooth 202, the second direction x is perpendicular to the first direction y, and the central axis a of the saw tooth 202 coincides with a central axis b between two adjacent conduction terminals 21.

As shown in fig. 4, the first side 2021 and the second side 2022 are both smooth straight lines, the saw teeth 202 have a triangular cross-sectional shape, and as shown in fig. 5, after the flip chip 20 is die-cut by using the die-cutting die 200 shown in fig. 4, the cross-sectional shape of the ends of the conductive terminals 21 is triangular, compared with the prior art, the distance between the ends of every two adjacent conductive terminals 21 along the second direction x is increased, and since the metallic foreign objects 22 are likely to remain at the ends of the conductive terminals 21 after the conductive terminals 21 are die-cut, in the embodiment of the present disclosure, the remaining metallic foreign objects 22 cannot communicate with the two adjacent conductive terminals 21 due to the increased distance, so as to avoid short circuit between the ends of the two adjacent conductive terminals 21.

Specifically, the distance between the ends of every two adjacent conductive terminals 21 along the second direction x is 12-100um, that is, the maximum distance between the first side 2021 and the second side 2022 in the second direction x is 100 um.

Further, the distance between the end of the first edge 2021 away from the tooth tip D and the end of the second edge 2022 away from the tooth tip D in the second direction x is equal to the distance between the center lines c of two adjacent conductive terminals 21 along the second direction x, so as to ensure that the die cutting die 200 can cut off the bonding end of the flip chip film 20 except for the conductive terminals 21.

It is understood that the size of the tip angle α of the saw tooth 202 is not too large nor too small, for example, when the tip angle α of the saw tooth 202 is too large, the size of the end of the conduction terminal 21 remaining without being punched out is too small, resulting in unnecessary waste; on the contrary, when the tooth tip angle α of the saw tooth 202 is too small, the end of the conduction terminal 21 remaining without being punched out is too large in size, so that the distance between the ends of the adjacent two conduction terminals 21 is slightly small, and there is a large risk of short circuit between the ends of the adjacent two conduction terminals 21 due to the remaining metal foreign matter 22.

Further, as shown in fig. 6, which is a schematic cross-sectional structure view of another trimming die 200 provided in the present disclosure, the first side 2021 and the second side 2022 may also be convex arcs, and as shown in fig. 7, after the flip-chip film 20 is trimmed by using the trimming die 200 in fig. 6, a dimension of the ends of the through terminals 21 in the second direction x is further decreased, so that a distance between every two adjacent ends of the through terminals 21 along the second direction x is further increased. Of course, in other embodiments, the first side 2021 and the second side 2022 may have other shapes, and the disclosed embodiments should not be limited thereto.

Furthermore, the first side 2021 and the second side 2022 are provided with a wavy stripe to increase the roughness of the end of the conduction terminal 21 properly, because the metal foreign matter 22 generally remains at the end edge of the conduction terminal 21, if the end surface of the conduction terminal 21 is relatively smooth, the metal foreign matter 22 is easy to slide down to a gap formed between two adjacent conduction terminals 21, so that a short circuit is easy to occur between two adjacent conduction terminals 21, and therefore the risk of the metal foreign matter 22 sliding down can be reduced due to the arrangement of the wavy stripe. It should be noted that the embodiments of the present disclosure are not limited to the wavy stripes, and a plurality of microstructures with smaller size, such as protrusions or grooves, disposed on the first side 2021 and the second side 2022 may also meet the requirement.

In the embodiment of the present disclosure, the material of the conduction terminal 21 is copper metal, and the material of the punching die 200 is tungsten steel.

After the die cutting die 200 finishes die cutting the flip chip 20, the metal foreign matters 22 remaining at the ends of the conductive terminals 21 are cleaned to completely remove the metal foreign matters 22.

The beneficial effects are that: according to the punching cutting die provided by the embodiment of the invention, the punching surface consisting of the plurality of sawteeth is arranged at the top of the cutting die main body of the punching cutting die and is used for punching the chip on film, so that the distance between the tail ends of two adjacent conducting terminals after punching is increased, the short circuit risk caused by residual metal foreign matters is reduced, and the defect of the laminating end of the chip on film is avoided.

In summary, although the present disclosure has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so that the scope of the present disclosure is defined by the appended claims.

Claims

1. The utility model provides a die-cut cutting die, its characterized in that, die-cut cutting die includes the cutting die main part, the top of cutting die main part is provided with the die-cut face of constituteing by a plurality of sawtooth for die-cut cover the brilliant film, cover the pressfitting end distribution of brilliant film and have a plurality of terminals that switch on of arranging in proper order, the face of punching is used for will lieing in switch on the subregion of the terminal both sides of terminal and cut out, with the terminal that switches on forms the closed angle form structure.

2. The die-cutting die according to claim 1, wherein said serrations have first and second edges on said die-cutting face, said first and second edges intersecting to form tips of said serrations, and a groove is formed between each adjacent two of said serrations, said grooves corresponding one-by-one to said conduction terminals.

3. The die cutting die of claim 2, wherein said first edge and said second edge are both convex arcs or said first edge and said second edge are both straight lines.

4. The die cutting die of claim 2 wherein said first edge and said second edge are symmetrically disposed along a first direction, wherein said first direction is in the direction of the central axis of said serrations, and wherein said tips are located on the central axis of said serrations.

5. The die cutting die according to claim 4, wherein a central axis of the saw-tooth coincides with a central axis between two adjacent conduction terminals.

6. The die-cutting die according to claim 4, wherein a distance between an end of the first edge far from the tine point and an end of the second edge far from the tine point in the second direction is equal to a distance between center lines of two adjacent conductive terminals along the second direction;

wherein the second direction is perpendicular to the first direction.

7. The die cutter die of claim 6, wherein the maximum distance between the first edge and the second edge in the second direction is 100 um.

8. The die cutter die according to claim 2, wherein the first edge and the second edge are provided with wavy striations.

9. The die cutter die according to claim 1, wherein the material of the conduction terminal is copper metal.

10. The piercing die of claim 1, wherein the material of the piercing die is tungsten steel.