JPS6273692A - Drawing method for pattern of printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] When forming a pattern for a printed circuit board on which mounted components having a large number of pin terminals are mounted, the present invention corresponds to pin terminals that are unused in the initial stage but may be used in the future. Select the through hole and connect it to the via hole prepared near the mounting area, and connect the other pin terminals through the circuit pattern.
Improving component mounting efficiency by connecting directly to other mounted components.

[Industrial application field]

TECHNICAL FIELD The present invention relates to an improvement in a method for drawing out a pattern on a printed board.

2. Description of the Related Art As semiconductor technology advances, the number of pin terminals of mounted components (for example, circuit components such as LSI, connectors, etc.) mounted on printed boards has increased.

At the initial stage, the pin terminals provided on such mounted components are
Not all of them are used; some pin terminals are reserved for future improvements.

Such printed boards are required not only to be able to mount components at high density, but also to have a small amount of warpage.

[Conventional technology]

FIG. 3 is a perspective view showing a conventional pattern drawer structure for a printed board, FIG. 4 is a rear view of the main part of the conventional example, and FIG. 5 is a rear view of the main part of another conventional example.

The printed board 1 shown in FIG. 3 is a multilayer printed board, and a circuit component (
For example, LSI, etc.) 2 and other circuit components are mounted at a high density, and a connector 3 having a large number of pin terminals for connecting to an external device is mounted on the side edge.

The pin terminal 20 of such a circuit component 2. and connector 3
Conventionally, the pin terminals are pulled out and connected in a pattern as shown below.

FIG. 4 shows a pattern extraction means for the circuit component 2, in which each pin terminal 20 is inserted in a mounting area 2A equal to the projected area for mounting the circuit component 2 in correspondence with the pin terminal 20. A through hole 4 is provided.

In addition, a rectangular via hole area 2a is provided around the four circumferences of this mounting area 2A as shown by dotted lines, and via holes 5 in a number equal to the through holes 4 are arranged, and the corresponding via holes 5 and through holes 4 are provided. and the pattern layer on the back side,
Alternatively, the connection is made by a lead pattern 6 provided in an intermediate pattern layer.

Then, the circuit pattern 7 is drawn out again from the via hole 5 and connected to the terminal of a desired mounted component.

FIG. 5 shows a pattern extracting means for the connector 3. A mounting area 3A having a projected area for mounting the connector 3 has through holes 4 corresponding to the pin terminals into which the respective pin terminals are inserted. It is arranged.

In addition, a rectangular via hole area 3a is provided near the mounting area 3A as shown by the dotted line, and via holes 5 in the same number as the through holes 4 are arranged, and the corresponding via holes 5 and through holes 4 are arranged. , the pattern layer on the back side,
Alternatively, the connection is made by a lead pattern 6 provided in an intermediate pattern layer.

Then, the circuit pattern 7 is drawn out again from the via hole 5 and connected to the terminal of a desired mounted component.

As described above, conventionally, a via hole area is provided in which the via holes 5 are arranged in parallel based on a predetermined parallel standard, and all the via holes 5 are arranged in the drawer pattern 6 and the through hole 4.
Connected to pin terminal via.

By providing a via hole area in this way, when pin terminals that are not used in the initial stage are used in subsequent circuit improvements, the arrangement position of the via holes 5 connected to the pin terminals via the drawer pattern 6 can be adjusted. , easily distinguishable and without direct connection to pin terminals.
Since it is only necessary to connect to the via hole 5, there is an advantage that circuit improvement is easy.

Further, since the via holes 5 are provided corresponding to all the pin terminals, there is an advantage that the connections between the via holes 5 can be changed when changing the circuit.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional printed circuit board pattern drawer structure, there is a via hole area near where the mounted component is mounted, which has an area approximately equal to the mounting area. Alternatively, there is a problem that other patterns cannot be formed, resulting in lower mounting efficiency.

In addition, since the via hole area is a printed circuit board with many holes and the via holes are arranged in parallel, there is a risk of warping in the via hole area. There is a problem in that it interferes with parallel insertion.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, the present invention, as shown in FIG. 1 or FIG. Of the through-holes 4 into which pin terminals are inserted, the through-holes 41 for unused terminals are connected to the via holes 51 provided near the mounting areas 2A and 3A via the lead-out patterns 6, The through hole 4 is directly connected to other mounted components via the circuit pattern 7.

[Effect]

According to the above means of the present invention, only a small number of via holes 5 are present in the vicinity of the mounted component, so that in addition to the mounting area, almost no via hole area is required.

Therefore, it is possible to mount other components close to the mounting area, and the mounting efficiency of the printed circuit board is improved.

Furthermore, since there are fewer via holes, the strength of the printed circuit board does not decrease, and there is less risk of warping of the printed circuit board.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a rear view of the main parts of one embodiment of the present invention, and FIG. 2 is a rear view of the main parts of another embodiment.

FIG. 4 shows a pattern extracting means for the circuit component 2 shown in FIG. A through hole 4 into which a terminal 20 is inserted is provided.

Among the through holes 4 into which pin terminals arranged in the mounting area 2A of the mounted component are inserted, the unused terminal through holes 41 corresponding to the pin terminals 20 that are not used in the initial stage are as follows.
It is connected via the drawer pattern 6 to a via hole 51 provided near the mounting area 2A.

The other through holes 4 are directly connected to the mounted components of the invention via the circuit pattern 7.

FIG. 2 shows a pattern extracting means of the connector 3 shown in FIG. A through hole 4 is provided for inserting a terminal.

Among the through-holes 4 into which pin terminals are inserted in the via-hole area 3a of the mounted component, unused terminal through-holes 41 corresponding to pin terminals that are not used in the initial stage are inserted into the vicinity of the mounting area 3A through the lead-out pattern 6. It is connected to a via hole 51 provided in the.

The other through holes 4 are directly connected to the mounted components of the invention via the circuit pattern 7.

As mentioned above, circuit components 2. Since only a small number of via holes 5 are present in the vicinity of the connector 3, almost no via hole area is required in addition to the mounting area 2A for the circuit component 2 and the mounting area 3A for the connector 3.

Therefore, these circuit components 2. Other components can be mounted close to the connector 3, improving printed board mounting efficiency.

Furthermore, since there are significantly fewer via holes 5 than in the conventional structure, the strength of the printed circuit board does not decrease, and there is little risk of the printed board warping in this area.

〔Effect of the invention〕

As explained above, in order to facilitate future circuit improvements, the present invention allows only pin terminals that are unused in the initial stage but may be used in the future to be connected to the vicinity of the mounting area via through holes. It is connected to the provided via hole, and it is possible to mount other components in close proximity to the mounted component that has a large number of pin terminals, which improves the mounting efficiency of the printed board and prevents warping of the printed board. There is little risk of this occurring, and there is no problem in parallel insertion of printed circuit boards into housings, etc.
It has excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a rear view of essential parts of one embodiment of the present invention, FIG. 2 is a rear view of essential parts of another embodiment, FIG. 3 is a perspective view showing a conventional pattern drawer structure of a printed board, and FIG. 4 5 is a rear view of the main parts of the conventional example, and FIG. 5 is a rear view of the main parts of another conventional example. In the figure, 1 is a printed board, 2 is a circuit component, 3 is a connector, 2A, 3A are mounting areas, 2a, 3a are via hole areas, 4 is a through hole, 5.51 is a via hole, 6 is a drawer pattern, 7 41 indicates a circuit pattern, and 41 indicates a through hole for an unused terminal.

Claims (1)

[Claims] A mounted component having a large number of pin terminals is mounted on a printed board (one
), among the through holes (4) into which the pin terminals arranged in the mounting area of the mounted component are inserted, the through holes (41) for unused terminals are inserted through the drawer pattern (6). It is characterized in that it is connected to a via hole (51) provided near the mounting area, and other through holes (4) are directly connected to other mounted components via the circuit pattern (7). How to draw out patterns on printed boards.