JPH02208993A - Printed board - Google Patents

Abstract

PURPOSE:To obtain a printed board of excellent solderability on which the leads of an electronic component are set in position by a method wherein adjacent holes very close to each other on the board are connected to each other through a slit whose width is equal to a specified value or more end smaller than the length of minor axis of the hole. CONSTITUTION:A printed board is composed of a printed board main body 1, a first and a second hole, 2 and 3, and a slit 4 which connects the holes 2 and 3 together. Here, the width a of the slit 4 is set larger than 0.5mm and smaller than the length of minor axis of the smaller hole (when the hole is not a right circle, the length of minor axis of the hole). In the substrate main body 1 structured as mentioned above, as the width a is made equal to 0.5mm or more, a die can retain its strength, where a molding die does not collapse or a punch is not broken. And, as the width a is made smaller than the length of short axis of the smaller hole, the slit 4 is small in width and the leads of an electronic component are set in position, and a metal foil provided around the holes is small in cutout, so that a printed board of this design is excellent in solderability.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a printed circuit board.

[Summary of the invention]

By connecting adjacent holes that are very close to each other with a slit having a width of 0.5 au or more and narrower than the short axis of the hole, the lead position of the electronic component is determined, and a printed circuit board with good soldering properties is provided. .

[Conventional technology]

Conventionally, when there are very closely adjacent holes drilled in the printed circuit board body, or when there are holes close to the outline of the printed circuit board body, when punching the holes in the printed circuit board body with a press, metal To prevent damage to the mold, adjacent holes or the outer shape of the printed circuit board body and holes were connected.

Such an example is shown in FIG. FIG. 2(A) shows an example in which two round holes 12 and 13 of the printed circuit board body 11 are connected to form a long hole 14. FIG. 2(B) shows an example in which a round hole 12 and a long hole 15 are connected to form an integral hole 16.

FIG. 2(C) shows an example in which a round hole 12 is adjacent to the outer shape of the printed circuit board body 11, and a notch 17 is formed by connecting the outer shape of the printed circuit board body 11 and the round hole 12.

[Problem H to be solved by the invention] By the way, in such a conventional printed circuit board,
Pudding)! Adjacent holes drilled in the board body or the outer shape of the printed circuit board body and the hole are connected to form a single hole, so because of this connection, when the lead of the electronic component is inserted, its position There was a problem that it could not be determined. Moreover, since there is no metal foil in the connecting portions of the holes, there is a problem that soldering is poor.

The present invention has been made in view of the above, and an object of the present invention is to provide a printed circuit board in which the lead positions of electronic components are determined and the soldering properties are good.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the printed circuit board of the present invention includes a printed circuit board body, first and second holes bored in the printed circuit board body, and a first and second hole formed in the printed circuit board body. a slit connecting the first and second holes, and the width of the slit is 0.5 mm.
In the above manner, the width is set to be smaller than the short diameter of the first and second holes.

(Function) The width of the slit connecting the first and second holes drilled in the printed circuit board body in this way is 0.5 mm or more and smaller than the short diameter of the first and second holes. By setting the slit, the width of the slit is narrow, so the position of the lead of the electronic component is determined, and there are few places where the metal foil provided around the hole is lost, so the soldering properties are good.

〔Example〕

Embodiments of the printed circuit board of the present invention will be described below with reference to the drawings. As shown in FIG. 1(A), the printed circuit board of the present invention includes a printed circuit board main body 1, first and second holes 2.3 bored in the printed circuit board main body l, and the first and second holes 2.3.
and a slit 4 connecting the second hole 2.3. The short axis of the first hole 2 is smaller than that of the second hole 3. The short diameter is used here because the hole is not necessarily a perfect circle. The width a of the slit 4 is 0.5 mm
The diameter is set to be smaller than the short diameter of the first hole 2, which is the smaller one.

The reason why the width a of the slit 4 is set to 0.5 mm or more is that 0.5 nun is the minimum width that can maintain the mold strength without causing the die of the mold to cave in or the punch to break. Furthermore, by making the width a of the slit 4 smaller than the short diameter of the first hole 2, the narrow width of the slit 4 allows the position of the lead of the electronic component to be determined, and the position of the lead of the electronic component is determined. Since there are few parts to be lost, the soldering properties are good.

FIG. 1(B) shows a second embodiment of the printed circuit board of the present invention. The printed circuit board includes a printed circuit board main body 1, and first and second holes 2 formed in the printed circuit board main body 1.
3, and a slit 4 connecting the first and second holes 2.3.
Consists of. The second hole 3 is a long hole, and the short axis of the long hole (the width in the direction orthogonal to the longitudinal direction of the long hole) is smaller than the short axis of the first hole 2. The width a of the slit 4 is 0.5 mm or more, and is set smaller than the breadth of the second hole 3 (elongated hole).

FIG. 1(C) shows a third embodiment of the printed A board of the present invention. The printed circuit board includes a printed circuit board main body 1, and first and second holes 2 formed in the printed circuit board main body 1.
3, and a slit 4 connecting the first and second holes 2.3.
Consists of. The second hole 3 is a long hole. The first hole 2 is arranged in a direction perpendicular to the longitudinal direction of the second hole 3 (long hole). The width a of the slit 4 is 0.5 mm
This is set smaller than the short diameter of the first hole 2.

FIG. 1(D) shows a fourth embodiment of the printed circuit board of the present invention. °The printed circuit board includes a printed circuit board body 1,
It consists of a first hole 2 bored adjacent to the outer shape of the printed circuit board body 1, and a slit 4 connecting the outer shape of the printed circuit board body 1 and the first hole 2. This corresponds to making the size of the second hole 3 of the first embodiment infinite. The width a of the slit 4 is 0.5 mm or more, and is set smaller than the short diameter of the first hole 2.

[Effects of the Invention] As is clear from the above description, the printed circuit board of the present invention includes a printed circuit board body, first and second holes drilled in the printed circuit board body, and the first and second holes. slit connecting the second holes, and the width of the slit is 0.5
By setting the width of the slit to be larger than am and smaller than the short diameter of the first and second holes, the width of the slit is narrow, so the position of the lead of the electronic component is determined, and the place where the metal foil provided around the hole disappears. Since the amount is small, soldering properties are good.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the printed circuit board of the present invention. Figure 1 (A) is for two round holes, and Figure 1 (B) is for two round holes.
shows the case of a round hole and a long hole, FIG. 1(C) shows the case of another round hole and a long hole, and FIG. 1(D) shows the outer shape of the printed circuit board body and the case of a round hole. FIG. 2 is a plan view showing a conventional example. Second
FIG. 2(A) shows the case of a round hole, FIG. 2(B) shows the case of a round hole and a long hole, and FIG. 2(C) shows the outer shape of the printed circuit board body and the case of a round hole. 1−・−・−・・−・・Printed circuit board body 2・・−・・
・・−・−・・First hole 3−・・・・・・・・・・−・−Second hole 4−・−・−・−・−・・Slit (A) 2 ALL Case (B) Case of a round hole and a long hole (A) Case of a round hole (C) Case of another round hole and a long hole (B) Case of a round hole and a long hole (D) Printed version of a Brireto board Fig. 1 (C) A plan view of a commercial example of the present invention in the case of a tatto shape and a round hole. Fig. 2 (C) A plan view of a conventional example in the case of a wood external shape and a round hole.

Claims (1)

[Scope of Claims] Consisting of a printed circuit board body, first and second holes bored in the printed circuit board body, and a slit connecting the first and second holes, the width of the slit is is 0.5 mm or more and smaller than the short diameter of the first and second holes.