JPS5819227B2 - Wiring inspection method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wiring inspection method for printed boards and the like.

2. Description of the Related Art A method shown in FIG. 1 is known as a wiring inspection method for automatically inspecting wiring on a printed circuit board or the like using an electronic device.

The wiring inspection method will be explained below using a schematic block diagram of FIG. 1.

In FIG. 1, 1 is connection reference data, 2 is a checkpoint storage circuit, 3 is a voltage application circuit, 4 is a circuit to be tested, 5 is a test circuit, 6 is a comparison circuit, 7 is test result data, 8-1
5 indicates an information line.

The terminals to be checked in the circuit under test 4 are stored in the checkpoint storage circuit 2 in order of the terminal coordinates of the circuit under test from the smallest number.

The checkpoint storage circuit 2 selects one of the check terminals and sends the coordinate information of this check terminal to the voltage application circuit 3 via the information line 8.

Voltage application circuit 3 applies voltage to designated terminals.

Note that the coordinate information is also sent to the detection circuit 5 via the information line 11, and the detection circuit 5 scans terminals other than the terminal designated by this coordinate information, detects and stores the terminal where voltage is present.

The detection circuit 5 sends the coordinates of the detected voltage to the checkpoint storage circuit 2 via the information line 12, thereby preventing the redundant application of voltage to check terminals that have already been inspected, thereby improving inspection efficiency. ing.

The connection reference data 1 is data indicating the coordinates of terminals to be connected to each other, and the comparison circuit 6 compares this connection reference data 1 with the detection data stored in the detection circuit 5, and the result is used as the inspection result data 7. Output as .

Next, a method for outputting test result data 7 based on connection reference data 1 and detection data will be explained using the data example shown in FIG.

Note that in FIG. 2, a, b, and c. d and e are the circuit under test 4
Let it indicate the terminal coordinates at .

In FIG. 2, ■ is connection reference data and represents the coordinates of terminals to be connected to each other, and the coordinate order is the order of the coordinates of the circuit under test 4 with the smallest number.

0 is detection data from the detection circuit 5 and indicates the coordinates of terminals actually connected in the circuit under test 4.

The comparison circuit 6 outputs the test result (2) from the above data (2) and 0.

The meaning of the data EEEI (2) indicates that the wiring for the terminal coordinate e is insufficient or disconnected.

However, with only the inspection result data of ①, terminal e, terminals a and b are detected.

It is not possible to determine whether the wiring between terminals c and d is insufficient or disconnected.

Therefore, it is inconvenient for maintenance, such as not being able to determine in advance the required wiring length for areas where wiring is insufficient.

An object of the present invention is to provide a wiring inspection method that solves the conventional problems as described above.

This purpose consists of connection reference data consisting of information in which the coordinates of multiple terminals to be connected to each other are chained in a predetermined coordinate order, and a collection of coordinates of a series of terminals that are actually connected on the printed board. In a wiring inspection method that inspects printed circuit board wiring by comparing detection data, in addition to the connection reference data and detection data, the coordinates of a plurality of terminals to be connected to each other are determined from information chained in the wiring connection order. Prepare connection order data and detect wiring shortages (or disconnections) based on the connection standard data and detection data.
After extracting certain terminal information, point out the mating connection terminal that should originally be connected to the terminal with the missing wiring (or disconnection) based on the information on the terminal with the missing wiring (or disconnection) and the connection order data. This is achieved by making sure to do the following.

Next, the wiring inspection method of the present invention will be explained with reference to the drawings.

In addition to the conventional connection reference data and detection data, the wiring inspection method of the present invention prepares connection order data 16 shown by dotted lines in FIG. This is what is output.

The method of the present invention for outputting test result data T from connection reference data, detection data, and connection order data will be explained with reference to FIG.

From the data of ■ and [phase] shown in Figure 3, □ can only be obtained from the inspection result data of the ward entrance, as already explained in Figure 2.
It is only known that there is a shortage or disconnection in the wiring to terminal e, but in the present invention, by referring to the connection order data 16, it is found that b is connected to terminal e, and the inspection result data 7 is is output.

Note that the connection order data 16 is generally required in the manufacturing process of printed circuit boards, etc., and does not need to be newly created for wiring inspection.

As explained above, according to the wiring inspection method of the present invention, if there is insufficient wiring or a disconnection between the terminals of the circuit to be inspected, it can be determined in advance which terminal and which terminal has the insufficient wiring or disconnection from the inspection result data. This has the effect of making maintenance work easier.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a wiring inspection method to which the present invention is applied, FIG. 2 is an example of inspection result data according to a conventional method, and FIG. 3 is an example of inspection result data according to the method of the present invention. In the figure, 1 is connection reference data, 2 is a checkpoint storage circuit, 3 is a voltage application circuit, 4 is a circuit under test, 5 is a detection circuit, 6 is a comparison circuit, 7 is test result data, 8 to 15
indicates an information line, and 16 indicates connection order data.

Claims (1)

[Claims] 1 connection standard data consisting of information in which the coordinates of multiple terminals to be connected to each other are chained in a predetermined coordinate order;
In a wiring inspection method that inspects wiring on a printed board by comparing it with detection data consisting of a set of coordinates of a series of terminals actually connected on a printed board, in addition to the connection reference data and detection data, Connection order data consisting of information in which the coordinates of a plurality of terminals to be connected to each other are chained in the wiring connection order is prepared, and information on terminals with insufficient wiring (or disconnection) is determined based on the connection reference data and detection data. After extraction, the corresponding wiring is insufficient (or disconnected)
A wiring inspection method characterized in that a mating connection terminal that should originally be connected to the terminal with insufficient wiring (or disconnection) is pointed out based on certain terminal information and the connection order data.