JPH09298269A - Lead frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead frame structure having a group of lead frames having many pieces, whose structure can solve a deformation problem of the lead frame group involved when the lead frame group is cut off from the lead frame structure to thereby obtain a good quality of lead frames without any deformation. SOLUTION: The lead frame structure 1 comprises a plurality of openings 8 made in a metallic plate at predetermined intervals, a group 6 of multiple lead frames 5 made within the openings 8, and bridges 7 for linkedly holding the lead frame group 6 within the openings 8. Material frames 2 are formed independently for the respective openings 8, a plurality of the material frames 2 are linked together by means of linking bridges 3, and easy-to-separate cutout lines 4 are made in the bridges 3 for linking hold of the lead frame group 6 to be extended up to the material frames 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame structure in which lead frames used in a semiconductor integrated circuit device or the like are attached on multiple sides, and more particularly to a lead frame structure in which lead pins having thin plates and multiple pins are attached on multiple sides. Regarding

[0002]

2. Description of the Related Art A lead frame used in a semiconductor integrated circuit device or the like is made of a thin metal plate and is manufactured by a photoetching method or a punching method using a die. When manufacturing a lead frame using a photo-etching method, in order to improve the manufacturing efficiency of the lead frame, it is common to manufacture a number of lead frames on a single metal plate or a long strip-shaped metal plate. There is.

FIG. 4 shows a general example of a lead frame structure 1 in which a large number of lead frames are multi-faced on a long strip metal plate. As shown in the figure, a long strip-shaped metal plate used as a material has a frame-shaped metal frame 9 having an opening 8.
Then, a lead frame group 6 composed of a plurality of lead frames 5 is formed in each opening 8 by etching. In the example of FIG. 4, two substantially rectangular lead frame groups 6 each including three substantially square lead frames 5 are formed in each opening 8. Also, bridge 7
Serves to connect the lead frame group 6 and the metal frame 9 so that the lead frame group 6 does not fall off from the metal frame 9 in the manufacturing process after etching. When a long strip-shaped metal plate is used as the material, the above-mentioned opening 8, lead frame group 6 and bridge 7 are continuously formed on the metal plate. Even when the metal plate used as the material is a sheet, a plurality of openings 8 and the lead frame group 6 and the bridge 7 are formed in each opening 8 in the same metal plate as in FIG. Is.

Next, the lead frame structure 1 described above
Finally, the individual lead frames 5 are obtained by cutting the lead frame group 6 connected to the metal frame 9 by the bridge 7 from the metal frame 9 and then further cutting the individual lead frame groups 6. , Individual leadframes 5
Is what you get.

Here, from the metal frame 9 to the lead frame group 6
It is general to perform the following steps when disconnecting. That is, a predetermined portion of the lead frame structure 1 is used as a rotation axis, and the metal plate is repeatedly bent up and down based on the rotation axis by a manual or mechanical means to perform a folding motion, thereby separating the metal plate. for that reason,
In order to facilitate the separation work, it is common to form a readily rupturable cut line as a rotation axis along with the formation of the lead frame structure 1 during etching. For example, a rupturable, for example, half-etching cut line is formed from the plate end of the metal frame 9 in a shape orthogonal to the bridge 7 during etching. In the example of FIG. 4, the cut lines 4, 4a, 4b, 4c are formed in the lead frame structure 1 portion on each dotted line shown in the drawing.

Now, a general procedure for separating the lead frame group 6 from the lead frame structure 1 by repeatedly moving up and down on the basis of the rotation axis will be described with reference to FIGS. 4 and 5. First, the cut line 4a in FIG. 4 is cut off, and the metal frame 9a is cut off as shown in FIG. 5 (a). At that time, for example, a portion of the lead frame structure 1 on the right side of the cut line 4a is clamped and fixed by a clamp or the like. Next, the metal frame 9a is manually held, or the metal frame 9a is clamped by a clamp or the like, and as shown in FIG. 6, the cut line 4a is used as a rotation axis, and a folding motion that is repeated up and down movement is performed on the metal frame 9a. It is something to do in the club.

Then, the cut line 4b shown in FIG. 5A is cut off, and the metal frame 9b is cut off and removed from the lead frame structure 1 as shown in FIG. 5B. To obtain the lead frame group 6b. Also in this case, for example, the part of the lead frame structure 1 on the right side of the cut line 4b is clamped and fixed by a clamp or the like. Then
The metal frame 9b and the lead frame group 6b are manually held, or sandwiched by a clamp or the like, and the cut line 4b is used as a rotation axis to perform a repeated vertical bending motion on the metal frame 9b and the lead frame group 6b. It is a thing.

Then, the cut line 4c shown in FIG. 5B is similarly cut off, and the metal frame 9c is cut off as shown in FIG. 5C. After that, this procedure is repeated to obtain the lead frame group 6 separated from the lead frame structure 1.

[0009]

At present, the lead frame has a thin plate thickness and tends to have a large number of pins. For example, in lead frames called layers for ceramics packages, the package size is large, the number of pins is from 200 pins to 300 pins or more, and the plate thickness is very thin, about 100 μm to 150 μm. .

Therefore, since the lead frame structure 1 is thin and weak in strength, it is likely to be deformed such as bending even with a slight pressure. In particular, as described above, when the lead frame group 6 is separated from the lead frame structure 1, the lead frame group 6 is repeatedly bent up and down. Therefore, when the lead frame group 6 is moved, an unnecessary force is applied to the lead frame group 6, and the lead frame group 6 is deformed improperly. That is, the lead frame 5 forming the lead frame group 6 is deformed improperly. It is a thing.

An object of the present invention is to provide a lead frame structure having a lead frame group to which multi-pin lead frames having a thin plate thickness are attached, and which is generated when the lead frame group is separated from the lead frame structure. The purpose of the present invention is to provide a lead frame structure in which the above deformation does not occur and to obtain a good quality lead frame free from deformation defects.

[0012]

That is, the present invention provides a plurality of openings formed in a metal plate at predetermined intervals, and a lead frame group formed in the openings and provided with multiple lead frames. In a lead frame structure composed of a bridge for connecting and holding a lead frame group in the opening, an independent material frame is formed for each opening, and the material frames are connected to each other by a connecting bridge, Further, there is provided a lead frame structure characterized in that the bridge, which is substantially parallel to the multiple mounting direction of the lead frame forming the lead frame group, is formed with a rupturable cut line extending to the material frame. By doing so, the above problems are solved.

Further, as a modification of the present invention, a plurality of openings formed in the metal plate at a predetermined interval, a lead frame group to which multiple lead frames are attached and formed in the opening, and the inside of the opening. In a lead frame structure including a bridge for connecting and holding a lead frame group, an independent material frame is formed for each opening, and a plurality of the material frames are connected by a connecting bridge, and the lead is formed. A breakable cut line that is substantially orthogonal to the bridge that is substantially parallel to the multiple mounting direction of the lead frame that forms the frame group is formed, and is parallel to the imposition direction of the lead frame that forms the lead frame group and faces the lead frame group. Which is located between the side of the material frame and the side of the lead frame group facing the side and which is substantially parallel to the imposition direction of the lead frame. Sex score lines, also a lead frame structure, characterized in that formed on each material frame perpendicular to the imposition direction of at least the lead frame,
It can be said that it is effective as a means for solving the above problems.

Further, among the easily breakable cut lines formed on the lead frame structure described above, the metal plate is penetrated at least at the end of the cut line formed substantially parallel to the transport direction of the lead frame structure. It can be said that a lead frame structure having a cutout portion is effective as a means for solving the above problems.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the lead frame structure of the present invention, as shown in FIG. 1, an independent frame (hereinafter referred to as a material frame 2) is provided for each opening 8 formed in the metal plate at a predetermined interval. . In each opening 8, as usual,
A lead frame group 6 composed of the lead frames 5 is formed, and the lead frame group 6 is connected to the material frame 2 by a bridge 7 and held in the opening 8 as in the conventional case. For the sake of convenience of description, the structure composed of the material frame 2, the lead frame group 6 and the bridge 7 shown in FIG. 1 is referred to as a framed lead frame structure 10.

Then, on at least one of the front and back surfaces of the framed lead frame structure 10, cut lines 4 which are easily breakable, for example, half-etched and which are substantially orthogonal to the bridges 7 are formed from the end of the material frame 2. It has been done.
Next, a plurality of lead frame structures 10 with frames are connected to form the lead frame structure 1 of the present invention, and the material frames 2 of the lead frame structures 10 with frames are connected by the connecting bridge 3. are doing.

The number, position and shape of the connecting bridges 3 for connecting the material frames 2 and the positions of the cut lines 4 are not limited to those shown in FIG. 1, but the thickness of the metal plate, the lead frame structure. The lead frame is manufactured by using the photoetching method, although it may be appropriately set in consideration of the bending when the body 1 is conveyed, the width of the material frame, the ease of cutting the connecting bridge described later, and the like. In this case, the lead frame structure 1 of the present invention is formed by an etching process.

Next, the lead frame structure 1 of the present invention
An example of the procedure for separating the lead frame group 6 will be described below. First, the lead frame structure 1 of the present invention is separated for each frame lead frame structure, and as shown in FIG. 2, the individual frame lead frame structures 10 separated from the lead frame structure 1 are separated. obtain. At that time, the connecting bridges 3 that connect the material frames 2 are cut to obtain the individual framed lead frame structures 10. For example, the connecting bridges 3 are cut by a cutter or scissors.

Next, the lead frame group 6 is separated from each of the separated lead frame structures 10 with a frame, which will be described with reference to FIGS. 2 and 3. First, the cut line 4X in FIG. 2 is cut off, and the material frame 2X is cut off as shown in FIG. 3A. At that time, for example, the portion of the framed lead frame structure 10 on the right side of the cut line 4X is clamped and fixed. Then material frame 2X
The material frame 2X portion is held by hand, or the material frame 2X portion is sandwiched by a clamp or the like, and the cut line 4X is used as a rotation axis to perform a repeated vertical movement bending movement on the material frame 2X portion.

Then, the cut line 4Y in FIG. 3A is cut off. As a result, as shown in FIG. 3B, the material frame 2Y portion and the material frame 2Z portion are separated and removed,
In addition, the lead frame group 6Y separated from the framed lead frame structure 10 is obtained.

Here, when cutting at the cutting line 4Y portion, the material frame 2Z portion and the lead frame group 6Y are fixed by a clamp or the like, and then the material frame 2Y portion is manually held or clamped by a clamp or the like. By using the score line 4Y as a rotation axis, a bending motion that is repeated up and down movement is performed on the material frame 2Y portion.

As described above, when the lead frame group 6 is separated from the lead frame structure 1 of the present invention, the material frame 2 may be repeatedly moved up and down, and the lead frame group 6 needs to be repeatedly moved up and down. Absent. Therefore, the lead frame group 6 can be separated from the lead frame structure 1 without applying unnecessary force to the lead frame group 6, and the lead frame group 6 is not deformed. That is, it can be said that the deformation defects that have occurred in the lead frames 5 forming the lead frame group 6 can be prevented.

Next, an embodiment according to claim 2 which is a modification of the present invention will be described with reference to the drawings. An embodiment of the lead frame structure 1 according to claim 2 is shown in FIG. 7, and as described above, an independent material frame 2 is provided for each opening 8 formed in the metal plate at a predetermined interval. The lead frame structure 10 with a frame is used. A lead frame group 6 composed of lead frames 5 is formed in each opening 8 as usual, and the lead frame group 6 is connected to the material frame 2 by a bridge 7 as in the conventional case. It is what is retained.

Then, a cut line 4K which is easily breakable, for example, half-etched, is formed on at least one of the front and back surfaces of the framed lead frame structure 10 so as to be substantially orthogonal to each bridge 7. . Next, a plurality of lead frame structures 10 with frames are connected to form a lead frame structure 1, and the material frames 2 of the lead frame structures 10 with frames are connected by a connecting bridge 3. .

The number, position, and shape of the connecting bridges 3 that connect the material frames 2 to each other and the position of the cut line 4K are determined by the thickness of the metal plate, the bending when the lead frame structure 1 is conveyed, and the material frame. It can be said that it may be set as appropriate in consideration of the width and the ease of cutting the connecting bridge described later. In the example of FIG. 7, the connecting bridge 3 is formed at the end of the metal plate, and the lead frame structure 1 is formed by an etching process.

Next, the side of the material frame 2 that is substantially parallel to the imposition direction of the lead frame 5 that constitutes the lead frame group 6 and faces the lead frame group 6, and the side of the lead frame group 6 that faces this side. As shown in FIG. 7, a breakable cut line 4L that is substantially parallel to the imposition direction of the lead frame 5 is formed at a position between them so as to cross each material frame 2 orthogonal to the imposition direction of the lead frame. are doing. In addition,
As shown in FIG. 7, when the connecting bridge 3 formed at the end portion of the metal plate hangs over the formation portion of the cut line 4L, the cut line 4L is also formed on the connecting bridge 3. Further, a bridge 7 that connects the lead frame group 6 to the material frame 2 is formed also from the metal plate end direction, and the cut line
When 4L is applied, the score line 4L is also formed on the bridge.

Next, an example of a procedure for separating the lead frame group 6 from the lead frame structure 1 shown in FIG. 7 will be described below. First, when the lead frame structure 1 shown in FIG. 7 has a long strip shape, the lead frame structure 1 is cut at the connecting bridge 3 part with a cutter or scissors, as shown in the example of FIG. In addition, the length is appropriately set. In the example of FIG. 8, the lead frame structure 10 with a frame has a length of connecting two pieces. In addition, the lead frame structure 1
It can be said that the lead frame structure 1 does not have to be cut particularly when the lead frame structure 10 is formed on a single-piece metal plate and the number of the framed lead frame structures 10 is small.

Next, the lead frame group 6 is separated from the lead frame structure 1 having an appropriate length shown in FIG. 8, which will be described with reference to FIGS. 8 and 9. First, the cut line 4L of FIG.
As shown in (a), the material frame 2L portion is cut off and removed. At this time, for example, the framed leadframe structure 10 portion sandwiched by the two cut lines 4L is sandwiched and fixed by a clamp. Next, the material frame 2L portion is manually held, or the material frame 2L portion is sandwiched by a clamp or the like, and the cut line 4L is used as a rotation axis to perform a repeated vertical bending motion on the material frame 2L portion.

Next, the material frame 2L is removed, and the connecting bridge 3 for connecting the remaining material frames 2K is cut with a cutting machine or scissors to leave the remaining material as shown in FIG. 9 (b). Frame 2K
To obtain a lead frame group 6 connected by a bridge 7. Next, from the state shown in FIG. 9 (b), cut the 2K part of the material frame
Separate at 4K. As a result, as shown in FIG. 9C, the lead frame group 6 separated from the material frame 2 is obtained.

Here, when the cut line 4K is cut off, the lead frame group 6 is fixed by a clamp or the like, and then the material frame 2K part is manually held or clamped by the clamp or the like to cut the cut line 4K. A bending motion that is repeated up and down movement is performed on the material frame 2K portion with the rotation axis.

As mentioned above, when the lead frame group 6 is separated from the lead frame structure 1 of the present invention, the material frame 2 may be repeatedly moved up and down, and it is necessary to repeatedly move the lead frame group 6 up and down. Absent. Therefore, the lead frame group 6 can be separated from the lead frame structure 1 without applying unnecessary force to the lead frame group 6, and the lead frame group 6 is not deformed. That is, it can be said that the deformation defects that have occurred in the lead frames 5 forming the lead frame group 6 can be prevented.

However, no matter how the lead frame group 6 is fixed, the vibrations when the material frame 2 is repeatedly moved up and down are transmitted to the lead frame group 6, and the internal parts are generated each time the material frame 2 is repeatedly moved up and down. It can be said that the stress may be transmitted to the lead frame group 6 and the lead frame group 6 may be deformed. Therefore, it can be said that it is desirable to reduce the number of repeated vertical movements required for separation. That is,
The invention according to claim 3 provides a lead frame structure in which deformation of the lead frame group 6 is prevented by reducing the number of repeated vertical movements required for separation.

Hereinafter, description will be given based on FIG. 10 schematically showing an embodiment according to claim 3. In the lead frame structure 1 shown in the example of FIG. 10, similar to the lead frame structure 1 according to claim 2, an independent material frame 2 is provided for each opening 8 formed in the metal plate at a predetermined interval. The lead frame structure 10 with a frame is provided. A lead frame group 6 composed of lead frames 5 is formed in each opening 8 as usual, and the lead frame group 6 is connected to the material frame 2 by a bridge 7 as is conventionally done.
It is what is retained within.

Next, a cut line 4K which is easily breakable, for example, half-etched, is formed on at least one of the front and back surfaces of the framed lead frame structure 10 so as to be substantially orthogonal to each bridge 7. . Next, a plurality of lead frame structures 10 with frames are connected to form a lead frame structure 1, and the material frames 2 of the lead frame structures 10 with frames are connected by a connecting bridge 3. .

In the lead frame structure 1 shown in the example of FIG. 10, the connecting bridge 3 is formed at the end of the metal plate, and the lead frame structure 1 is formed by the etching process. .

Next, the side of the material frame 2 that is substantially parallel to the imposition direction of the lead frame 5 that constitutes the lead frame group 6 and faces the lead frame group 6, and the side of the lead frame group 6 that faces this side. As shown in FIG. 10, at a position between them, a breakable line 4L that is substantially parallel to the imposition direction of the lead frame 5, for example, a half-etched cut line 4L,
It is formed so as to cross each material frame 2 orthogonal to the imposition direction of the lead frame. In addition, as shown in FIG. 10, when the connecting bridge 3 formed at the end portion of the metal plate is hooked on the formation portion of the cut line 4L, the cut line 4L is also formed on the connecting bridge 3. Further, when the bridge 7 that connects the lead frame group 6 to the material frame 2 is formed from the end of the metal plate and the cut line 4L is formed, the cut line 4L is also formed on the bridge.

Here, as a feature of the invention according to claim 3, the cut line 4 formed in a direction substantially parallel to the carrying direction of the lead frame structure 1 is provided with a notch portion penetrating the metal plate. Is. For example, in FIG. 10, it is assumed that the lead frame structure 1 is conveyed in the direction indicated by the arrow in the figure. At this time, the lead frame structure 1
As shown in FIG. 10, the notch 11 penetrating the metal plate is provided on each cut line 4L that is substantially parallel to the conveyance direction of
Is provided. The notch 11 penetrating the metal plate is formed when the metal plate is etched to form the lead frame structure 1, similar to, for example, a half-etching easily breakable score line.

Since the notch 11 penetrating the metal plate is provided, it is easy to cut off the cut line 4L. For example, only half-etched lines are cut lines
When 4L is formed, it is necessary to cut 3L at the cut line 4L part.
Suppose that a reciprocating up-and-down motion is required. However, by providing the notch 11 in the score line 4L, the separation can be performed by the repeated vertical movement of about 2 to 2.5 reciprocations. By reducing the number of repeated vertical movements required for disconnection, the vibration transmitted to the lead frame group 6 is reduced, and
It can be said that the internal stress transmitted to the lead frame group 6 due to the repeated vertical movement is reduced, and it is possible to prevent the lead frame group 6 from being deformed.

Next, the reason why the notch 11 is provided in the cut line 4 which is substantially parallel to the transport direction of the lead frame structure 1 will be described below. Lead frame structure 1
It is general to use a transporting roller as a means for transporting. That is, as shown in the example of FIG. 11, the lead frame structure 1 is transported by being mounted on a plurality of transport rollers 12 that are rotated by the driving means. The thick arrows in the figure indicate the transport direction of the lead frame structure 1.

The lead frame structure 1 is carried while being in contact with each carrying roller 12. It can be said that when the lead frame structure 1 passes over the transport rollers 12 while being in contact with the transport rollers 12, the lead frame structure 1 moves up and down in a slightly wavy manner. The score line 4 provided with the notch 11 is structurally weak in order to facilitate cutting as described above. Therefore, for example, when the notch 11 is provided in the cut line 4K that is perpendicular to the carrying direction of the lead frame structure 1 shown in FIG. 10, the cut line 4K is structurally weakened by the vertical movement during carrying. It bends at the portion, and as shown in FIG. 11, a so-called peco defect occurs.

Further, when the notch 11 is provided in the score line 4 which is perpendicular to the carrying direction of the lead frame structure 1 and becomes structurally weak, the vertical movement at the time of carrying is repeated up and down required for the above-mentioned separation. Works in the same way as the
There is a possibility that the lead frame structure 1 may be cut at the four cut lines that are perpendicular to the transport direction.

For this reason, a notch is provided in a cut line formed substantially parallel to the carrying direction of the lead frame structure 1, for example, the cut line 4L shown in FIG. As a result, it is possible to prevent the above-mentioned defective peco and cutting during the transportation.

In the example of FIG. 10, the notch 11 is provided at both ends of the cut line 4L, but the place where the notch 11 penetrating the metal plate is also provided in the middle of the cut line 4L. I do not care. However, if the number of notches 11 is too large, the notch line 4L becomes structurally weak. Therefore, in consideration of the thickness of the metal plate, the length of the notch line 4, etc., the place and number of the notches 11 are appropriately set. It is desirable to set.

Next, when the individual lead frame groups 6 are obtained from the lead frame structure 1 according to claim 3, as described above, the individual lead frames from the lead frame structure 1 according to claim 1 or 2 are obtained. A procedure similar to that for obtaining the group 6 is performed. For example, when the individual lead frame groups 6 are obtained from the lead frame structure 1 shown in the example of FIG. 10, the same procedure as in FIGS. 7 to 9 is performed.

It is needless to say that the embodiment of the present invention is not limited to the above drawings and description, and various modifications can be made based on the spirit of the present invention. For example, an easily breakable score line may be formed in the connecting bridge 3 and the connecting bridge 3 may be cut without using a cutter or scissors.

[0046]

When the lead frame group is separated from the lead frame structure of the present invention, the lead frame group can be separated without applying unnecessary force.
That is, the present invention solves the problem of deformation of the lead frame group that occurs when the lead frame group is separated from the lead frame structure, which has occurred in the conventional lead frame structure. The present invention solves the problem of deformation that has occurred in the lead frames forming the lead frame group, and is practically excellent in obtaining a good quality lead frame that is free from deformation defects.

[0047]

[Brief description of drawings]

FIG. 1 is a plan view showing one embodiment of a lead frame structure of the present invention.

FIG. 2 is a plan view showing an example of a main part of the lead frame structure of the present invention.

3 (a) and 3 (b) are explanatory views showing an example of separation of the lead frame group from the lead frame structure of the present invention in the order of steps.

FIG. 4 is a plan view showing an example of a conventional lead frame structure.

5A to 5C are explanatory views showing an example of the separation of the lead frame group from the conventional lead frame structure in the order of steps.

FIG. 6 is a cross-sectional view showing an example of separation from the lead frame structure.

FIG. 7 is a plan view showing another embodiment of the lead frame structure of the present invention.

FIG. 8 is a plan view showing a main part of another embodiment of the lead frame structure of the present invention.

9A to 9C are explanatory views showing an example of the separation of the lead frame group from another embodiment of the lead frame structure of the present invention in the order of steps.

FIG. 10 is a plan view showing a main part of another embodiment of the lead frame structure of the present invention.

FIG. 11 is an explanatory diagram illustrating an example of a lead frame structure that is transported on a transport roller.

[Explanation of symbols]

 1 Lead Frame Structure 2 Material Frame 3 Connection Bridge 4 Cut Line 5 Lead Frame 6 Lead Frame Group 7 Bridge 8 Opening 9 Metal Frame 10 Lead Frame Structure with Frame 11 Notch 12 Transport Roller

Claims (3)

[Claims] 1. A plurality of openings formed in a metal plate at predetermined intervals, a lead frame group formed in the opening and provided with multiple lead frames, and a lead frame group connected and held in the opening. In a lead frame structure including a bridge that forms an independent material frame for each opening, and connects the material frames to each other with a connecting bridge, and forms a lead frame group. 2. A lead frame structure, wherein an easily rupturable cut line is extended to the material frame in the bridge substantially parallel to the multi-direction attachment direction. 2. A plurality of openings formed in a metal plate at predetermined intervals, a lead frame group formed in the opening and provided with multiple lead frames, and a lead frame group connected and held in the opening. In a lead frame structure including a bridge that forms an independent material frame for each of the openings, and connects the material frames to each other with a connecting bridge, and forms a lead frame group. A side of the material frame that forms a breakable cut line that is substantially orthogonal to the bridge that is substantially parallel to the multiple imposition direction of the frame and that is parallel to the imposition direction of the lead frame that constitutes the lead frame group and that faces the lead frame group And a line between the side and the opposite side of the lead frame group, which is easy to break and is substantially parallel to the imposition direction of the lead frame. Lead frame structure, characterized in that also formed in each material frame perpendicular to the imposition direction of the lead frame. 3. Of the easily breakable score lines formed on the lead frame structure according to claim 1 or 2, at least at an end portion of the score line formed substantially parallel to the transport direction of the lead frame structure. A lead frame structure having a cutout portion penetrating a metal plate.