JP3501164B2 - Substrate frame and split groove forming method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate frame and a method for forming the split groove, in which the split groove can be reliably formed with high accuracy and the printed circuit board can be easily separated.

[0002]

2. Description of the Related Art As shown in FIG. 6, a substrate frame 9 comprises a printed circuit board 90 to be separated, a connecting frame 96, and a tie bar 901 connecting both. This tie bar 90
Formed on both sides of 1 by punching, drilling, etc.
A hole 91 having a curved portion 910 is formed.
As shown in FIGS. 6 and 7, the printed circuit board 90 has a chip mounting portion 9 for mounting a semiconductor chip or the like in the central portion.
5 and a conductor pattern 94 for electrically connecting this to the through hole 97.

On both sides of the tie bar 901, as shown in FIG. 6, a hole 91 having a curved portion 910 is formed. In addition, split grooves 93 for dividing the printed circuit board 90 into individual pieces are formed on both front and back surfaces of the tie bar 901. As shown in FIGS. 6 and 7, the split groove 93 is provided on the line connecting the curved portions 910 in the punched holes 91 located on both sides of the tie bar 901. As shown in FIG. 5, the split groove 93 is formed in a substantially V shape on the front and back surfaces of the printed circuit board 90 by the cutter 8.

[0004]

However, the above-mentioned conventional technique has the following problems. That is, as shown in FIGS. 5 and 7, the split groove 93 is formed in the curved portion 91 of the punched hole 91.
It is formed by the cutter 8 with 0 as a starting point 930.
However, since the starting point 930 is the curved portion 910, the cutter 8 may slip along the curved line.

Therefore, the split groove 93 may not be formed accurately. If the dividing groove 93 is not accurately formed, the printed circuit board 90 is formed along the dividing groove 93.
And the tie bar 901 are separated, and the printed circuit board 90
It becomes difficult to divide into individual pieces.

When the cutter 8 is used for processing, if the starting point 930 is not easily determined due to the slip, it is difficult to form the split groove 93. The present invention is
The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a substrate frame and a method for forming a split groove thereof, in which split grooves can be reliably formed with high accuracy and a cutter can be easily divided into individual pieces.

[0007]

According to the present invention, a printed circuit board to be singulated, a connecting frame, and a tie bar for connecting the two are formed. On both sides of the tie bar, a punched hole having a curved portion is formed by punching or drilling. With respect to the printed circuit board frame, on the front and back surfaces of the tie bar at the curved part,
When forming a split groove with a cutter, a guide hole having a semicircular shape or the like is provided in advance in the curved portion, and the split groove is formed with the cutter from the guide hole as a starting point. There is a method of forming.

In the present invention, the most important point is that a guide hole having a semicircular shape or the like is provided in advance in the curved portion, and a split groove is formed by a cutter starting from the guide hole. The guide hole is a starting point when the split groove is formed by the cutter, and is a portion which plays a role of positioning for abutting the guide hole to perform cutting. This guide hole is
There is an opening on the side of the hole, and in the curved part of the hole,
It is formed as a notch of various shapes such as a semicircle, an ellipse, and a horn.

A plurality of the guide holes are simultaneously formed, for example, by punching a part of the tie bar at the same time as forming the punched hole or by drilling. Alternatively, it is formed before and after forming the punched hole. The width of the guide hole is preferably 0.5 to 2 mm, for example.
If it is less than 0.5 mm, it will be difficult to insert the cutting edge of the cutter, while the outline of the printed circuit board exceeding 2 mm will be poor.

The split grooves are formed on both front and back surfaces of the printed circuit board. For example, in a printed circuit board having a thickness of 1.6 mm, the split groove has a line width of about 0.5 mm. Also,
The cross-sectional shape is substantially V-shaped, and the spread angle is, for example, 20 to 6
It is preferably 0 degree. If it is less than 20 degrees, it becomes difficult to form the split grooves, while if it exceeds 60 degrees, it becomes difficult to form cracks or separate into individual pieces.
The connecting frame is provided with, for example, sprocket holes and alignment marks necessary for carrying the substrate frame or for alignment.

Next, by the method of forming the split groove, for example, a printed circuit board to be singulated, a connecting frame, and tie bars for connecting the two are formed, and a board having curved holes on both sides of the tie bar is formed. In the frame, the front and back surfaces of the tie bar have a split groove provided between the curved portions, and the end of the split groove is formed with a semicircular guide hole or the like that opens into the hole. It is possible to manufacture a substrate frame characterized by the above.

[0012]

[Operation and effect] In the split groove forming method of the present invention,
A semicircular guide hole is provided in advance in the curved portion. Therefore, when forming the split groove starting from the curved portion of the punched hole, the tip of the cutter is brought into contact with the guide hole, and the cutter is moved forward from this point to form the split groove on both the front and back surfaces of the tie bar. To do. Therefore, the cutter does not slip at the curved portion. Therefore, the split groove can be reliably formed with high accuracy.

Since the guide hole is provided, when the printed board and the tie bar are cut in the split groove to divide the printed board into individual pieces, the cuts are formed in the guide holes formed at both ends of the split groove. Occurs starting from. Therefore, the above division is extremely easy. Therefore, according to the present invention, it is possible to provide a board frame and a method for forming the split groove, in which the split groove can be reliably formed with high accuracy and the printed board can be easily separated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A substrate frame and a method of forming a split groove thereof according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the board frame 1 includes a printed board 10 to be separated into pieces, a connecting frame 16, and a tie bar 101 connecting the both. Above tie bar 101
A punching hole 11 having a curved portion 110 provided by punching or drilling is formed on both sides of the punching hole.

In the curved portion 110, as shown in FIGS. 1 and 2, split grooves 13 are formed by the cutter 8 on both front and back surfaces of the tie bar 101. In addition, the curved portion 110 is provided with a semicircular guide hole 12 in advance. Then, the split groove 13 is formed by the cutter 8 starting from the guide hole 12. As shown in FIGS. 1 and 4, the guide hole 12 serves as a starting point 130 when the split groove 13 is formed by the cutter 8 and also serves to position the cutter 8.

The guide hole 12 is, as shown in FIG.
The curved portion 1 of the hole 11 is opened on the side of the hole 11
It is formed on 10 as a notch such as a semicircle. The guide hole 12 is formed at the same time when the punched hole 11 is formed.
A part of 1 is simultaneously formed using a die for punching. The opening width of the guide hole 12 is about 1.0 mm, which is substantially the same as the width of the cutting edge of the cutter 8.

As shown in FIG. 2, the split groove 13 has a depth of about 0.5 mm in the printed circuit board 10 having a thickness of 1.6 mm, for example. The cross-sectional shape is approximately V
It is in the shape of a letter and its spread angle is about 30 degrees. The split groove 13
Is used to separate the printed circuit boards 10 to be diced into individual printed circuit boards 10, for example, immediately before the final product inspection. As shown in FIG.
A sprocket hole 160 for alignment is formed as shown in FIG.

As shown in FIG. 3, the tie bar 101 is formed in a thread-wound shape between the curved portions 110 which are the tips of the punched holes 11. Printed circuit board 1
0 has a chip mounting portion 15 in the central portion as shown in FIGS. In addition, the conductor pattern 14 for electrically connecting the chip mounting portion 15 and the through hole 17
However, a large number are formed on both front and back surfaces of the printed circuit board 10.

The substrate frame 1 is made of a glass epoxy composite member. The printed circuit board 10 is attached to the tie bar 1
When separating from 01 and separating into individual pieces, for example, a force is applied to the tie bar 101 side and the both are divided at the above-mentioned split groove 13 portion.

Next, the function and effect will be described. In this example, as shown in FIG. 1, the curved portion 110 has a semicircular guide hole 12 in advance. Therefore, when forming the split groove 13 with the curved portion 110 of the punched hole 11 as the starting point, the tip of the cutter 8 is brought into contact with the guide hole 12, and the starting point 102 is used to move the cutter 8 forward to move the tie bar 101. The split grooves 13 are formed on both the front and back surfaces of.

Therefore, the cutter 8 does not slip at the curved portion 110. Therefore, the split groove 13 can be reliably formed with high accuracy. Further, since the guide hole 12 is provided, the printed circuit board 10 and the tie bar 101 are separated from each other in the split groove 13 so as to separate the printed circuit board 10 from each other.
When dividing into individual pieces, the above-mentioned division occurs with the guide holes 12 formed at both ends of the split groove 13 as starting points. Therefore, the above division is extremely easy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state of forming a split groove starting from a guide hole in a split groove forming method according to an embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a substrate frame according to the embodiment.

FIG. 4 is a plan view of a main part of a substrate frame according to the embodiment.

FIG. 5 is a cross-sectional view showing a state of forming a split groove in a conventional example.

FIG. 6 is a plan view of a conventional board frame.

FIG. 7 is an explanatory view showing a problem at the time of forming a split groove in the conventional split groove forming method.

[Explanation of symbols]

1. ． ． Board frame, 10. ． ． Printed board, 101. ． ． Tie bar, 11. ． ． Hole, 110. ． ． Curved part, 12. ． ． Guide hole, 13. ． ． Split groove, 16. ． ． Connection frame, 8. ． ． cutter,

Claims (2)

(57) [Claims] 1. A board frame comprising a printed board to be singulated, a connecting frame, and tie bars for connecting the two, and piers having curved portions formed on both sides of the tie bar by punching or drilling. On the other hand, when forming a split groove with a cutter on both front and back surfaces of the tie bar in the curved portion, a semi-circular guide hole is previously provided in the curved portion,
A method for forming a split groove in a substrate frame, characterized in that the split groove is formed by a cutter starting from the guide hole. 2. A board frame comprising a printed circuit board to be singulated, a connecting frame, and tie bars for connecting the two, and on both sides of the tie bar, a hole having a curved portion is formed. Has a split groove provided between the curved portions, and a semicircular guide hole or the like opening to the punched hole is formed at an end of the split groove. flame.