JPH0245225B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiring system for printed circuit boards that enables common use of fixtures used in an insert tester for automatically testing printed circuit board packages.

The wiring route on the printed board is automatically designed by inputting information on each component to be mounted or information on connecting component terminals to each other. During such automatic design,
Connections that cannot be wired on the printed board itself must be wired manually after the components are mounted. Since such manual wiring increases the product price, it is desirable to improve the proportion of wiring that does not need to be connected by wiring, that is, the wiring rate as much as possible. When a component mounted on a printed board produced in this manner is automatically tested using an in-circuit tester, a fixture is used to electrically connect the component to be tested and the in-circuit tester. Different wiring paths for each printed board require separate fixtures for each printed board, increasing the cost of the in-circuit tester.

[Conventional technology]

Conventionally, when automatically designing the wiring route on a printed board, each printed board is set to maximize the wiring rate, so the wiring route is set completely independently for each printed board. . Therefore, it is difficult to share the fixtures required when testing each printed board with an insert tester, and in many cases it is necessary to provide them independently for each printed board.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in the conventional printed board wiring system, the proportion of fixtures that can be shared among designed printed boards is low, which may impair the economic efficiency of in-circuit testing.

[Means for solving problems]

The problem is that the terminal position information of each component to be mounted on the printed board, the connection information for connecting the component terminals to each other, and the terminal position information of the fixture used by the in-circuit tester that tests the printed board. input, assume each possible wiring route on the printed board that connects the two component terminals to be connected, and determine whether or not the fixture terminal exists on each wiring route. This problem is solved by the present invention, which is characterized by employing a wiring route in which the terminals of the fixture are present.

[Effect]

That is, according to the present invention, when automatically designing the wiring route of a printed board, it is set to pass through the terminal position of a predetermined fixture, so the fixture can be shared for testing many printed boards.
The economical efficiency of the in-circuit tester is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a wiring system of a printed board according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the terminal determination processing process in FIG. 1, and FIGS. d is a diagram illustrating the wiring determination processing process in FIG. 2;

1 to 3d, a central processing unit (CPU) 1 stores information on each component to be mounted on a printed circuit board to be designed and information on interconnecting component terminals in a file (F). 2, then two points, component terminals A and B, to be connected are extracted (step S1 in FIG. 2). Next, central processing unit 1
calculates the intersection point X1 of the horizontal line passing through the extracted point A and the vertical line passing through the point B, and the intersection point X2 of the vertical line passing through the point A and the horizontal line passing through the point B [step S2 and Figure 3a]. Next, the central processing unit 1 extracts the terminal position information of the fixture used by the in-circuit tester that tests the printed board from the file (F) 3, and determines whether the fixture terminals that match the intersection X1 or X2 are mutually connected. (Step S3). If a fixture terminal T1 matching the intersection X1 is detected, the wiring L1 connecting point A and fixture terminal T1 and the wiring L2 connecting fixture terminal T1 and B point are connected to points A and B. is set as the wiring route to be connected, and if fixture terminal T2 that coincides with intersection X2 is detected,
Wiring L3 connecting the point and fixture terminal T2,
Then, a wiring L4 connecting fixture terminal T2 and point B is set as a wiring route connecting points A and B [step S4 and FIG. 3a].

If the fixture terminal T1 or T2 that matches the intersection X1 or X2 is not detected (step S3), point A, intersection X1, point B, and intersection X2 are
The presence or absence of a fixture terminal on each side of the rectangle AX1BX2 whose vertices are AX1BX2 is searched for (step S5). If fixture terminal T3 on side A-X1 is detected, wiring L11 connecting point A and fixture terminal T3, and wiring L1 connecting fixture terminal T3 and point B
2, L21, and L22 are set as the wiring route to connect the A line and the B line, and when the fixture terminal T4 on the side X1-B is detected,
Wiring L1 connecting the point and fixture terminal T4
1, L12, L21, and fixture terminal T
If the wiring L22 connecting point A and point B is set as the wiring route, and the fixture terminal T5 on side A-X2 is detected, the wiring L31 connecting point A and the fixture terminal T5, and Wiring L3 connecting fixture terminal T5 and point B
2, L41, and L42 are set as the wiring route connecting point A and point B, and when fixture terminal T6 on side X2-B is detected, A
Wiring L3 connecting the point and fixture terminal T6
1, L32, L41, and fixture terminal T
Wire L42 connecting 6 and B point is connected to A point and B
A wiring path is set to connect the points (step S4 and FIG. 3b).

If the fixture terminals T3, T4, T5 or T6 on each side of the rectangle AX1BX2 are not detected (step S5), the central processing unit 1
The presence or absence of a fixture terminal existing in AX1BX2 is searched (step S6). If rectangle AX1
When fixture terminal T7 in BX2 is detected, wiring L13, L51 connecting point A and fixture terminal T7, and wiring L52, L43 connecting fixture terminal T7 and point B
is set as a wiring route connecting point A and point B [step S4 and FIG. 3c].

Fixture terminal T inside rectangle AX1BX2
7 is not detected, the central processing unit 1 extends sides A-X2 of rectangle AX1BX2 by a predetermined length to A-X3, and extends sides X1-B by a predetermined length to X1-X4 to form rectangle AX1X4. After configuring [Step S
7 and FIG. 3d], again steps S3 to S6
Repeat. In Figure 3d, the rectangle AX1X4
Fixture terminal T8 was detected on side X3X4 (step S5), so wires L6 and L71 connecting point A and fixture terminal T8,
Then, the wiring L72 connecting the fixture terminal T8 and the point B is set as a wiring route connecting the points A and B [step S4 and FIG. 3d].

The central processing unit 1 repeats the above process for all two points on the printed circuit board to be designed extracted from the file 2 (step S8), and completes setting wiring routes for all two points. Then, the automatic design of the wiring route for the printed board is completed and stored in the file (F)3.

As is clear from the above description, according to this embodiment, the wiring route connecting two points of each component terminal is set to pass through the target fixture terminal, so the fixture used by the in-circuit tester is Can be shared.

Note that FIGS. 1 to 3 d are only one embodiment of the present invention, and the positions of points A and B and the fixture terminals T1 to T8 are not limited to those shown in the figures. Although many other modifications may be considered, the effects of the present invention remain the same in any case.

〔Effect of the invention〕

As described above, according to the present invention, when automatically designing the wiring route of a printed board, the wiring route is set to pass through the terminal position of a predetermined fixture, so the fixture can be used in common for testing many other types of printed boards. This makes it possible to improve the economic efficiency of in-circuit testing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a wiring method of a printed board according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the wiring determination processing process in FIG. 1, and FIG.
FIGS. 3A to 3D are diagrams for explaining the wiring determination processing process in FIG. 2. In the figure, 1 is a central processing unit (CPU), 2 to 4 are files (F), 5 is a storage device (MEM),
A and B indicate component terminals, L1 to L72 indicate wiring routes, and T1 to T8 indicate fixture terminals.

Claims (1)

[Claims] 1. Input the terminal position information of each component to be mounted on the printed board, the connection information for connecting the component terminals to each other, and the terminal position information of the fixture used by the in-circuit tester that tests the printed board, and make the connection. Assuming each possible wiring route on the printed board that connects the two target component terminals, it is determined whether or not there is a terminal of the fixture on each wiring route, and the terminal of the fixture is determined. A wiring method for printed circuit boards characterized by the use of a wiring route in which terminals are present.