JPH0652288B2 - Wiring inspection device - Google Patents

Description

The present invention relates to a wiring inspection device, and more particularly to a wiring inspection device for inspecting a wiring pattern such as a printed circuit board for correctness.

[Common technology]

In general, the wiring inspection equipment checks the actual connection between the terminals specified by the wiring based on the regular wiring data of the inspected product There are two tests, an insulation test to check that there is no connection with the terminal.

[Prior Art] A conventional wiring inspection device conducts a continuity test between a leading terminal of each wiring and a terminal connected to the leading terminal for each wiring data, and stores a non-conducting terminal as a defective conduction terminal. ,
Insulation test terminal data to be the target of the insulation test is created by the terminal having poor continuity and the lead terminal of each wiring.

Select an arbitrary insulation test terminal and apply the test voltage to that terminal to take in the voltage of all other insulation test terminals at the same time to perform one-to-many insulation test, and the voltage is lower than the preset judgment voltage. If it is not connected, it is judged that it is not connected, and if it is higher, it is judged that one of the terminals acquired at the same time is connected.

When it is judged that the terminals are connected, the voltage is successively taken in one terminal in order to perform a one-to-one insulation test, the same judgment is made, and the connected terminals are detected and stored as a defective insulation terminal.

Next, the selected terminal and the terminal judged to be connected to the terminal are deleted from the insulation inspection terminal data, and the insulation inspection is continued until there is no insulation inspection terminal data.

The wiring of the inspected product is checked for correctness by comparing and verifying the defective continuity terminal and the defective insulation terminal with the regular wiring data.

[Problems to be solved by the invention]

The above-mentioned conventional wiring inspection device performs a continuity test for each wiring data, and determines the connection is performed by performing a one-to-many insulation inspection with the conduction failure terminal and the leading terminal of each wiring data as insulation inspection terminal data. In case of 1: 1 insulation test. If there is a defective continuity terminal, the one-to-one insulation test is again conducted between the terminals inspected by the continuity test, so this one-to-one insulation test is a wasteful test, and there is a drawback that it spends more time than necessary .

[Means for solving problems]

The wiring inspection apparatus of the present invention includes a wiring data storage unit that stores regular wiring data and wiring numbers regarding a product to be inspected, which is composed of a plurality of pieces of terminal data indicating the presence or absence of connection by wiring.
An inspection voltage applying unit for applying an inspection voltage to any one terminal of the inspected product, an inspection terminal connecting unit for connecting an arbitrary terminal of the inspected product to a reference resistance, and a detection voltage by the reference resistance are set in advance. A determination unit that determines the presence or absence of wiring between arbitrary terminals of the inspected product based on whether the determination voltage is higher than the determined voltage, and a terminal number of the terminal that is determined to be non-conductive by the determination unit and the terminal. Continuity failure terminal storage means for storing the wiring number of the wire as a pair and storing it as terminal data; continuity check data and insulation test data from the terminal data stored in the poor contact terminal storage means and the regular wiring data of the inspected product. The inspection data creating means for creating the inspection data, the inspection data created by the inspection data creating means, and the determination result by the determining means are collated, and if there is an abnormality, the inspection data is output. Configured to include a result output unit.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

The wiring inspection apparatus shown in FIG. 1 has a hard disk 2 in which the regular wiring data of the inspected product 1 is registered, a printer 3 for outputting the inspection result, and a terminal 4 for inputting the product name of the inspected product. A central control unit 5 comprising a so-called microcomputer, memory, etc. connected to the test voltage, and a test voltage input from a positive output of a test voltage source 6 whose − output is grounded in response to an applied terminal command signal a from the central control unit 5. an inspection voltage applying section 7 for outputting c to one designated terminal of the inspection object 1,
A test terminal for receiving a test terminal command signal b from the central control unit 5 and simultaneously connecting one or more designated terminals of the DUT 1 to the + input terminal of the comparator 11 and the other end of the reference resistor 9 whose one end is grounded. The connection portion 8 is compared with the detection voltage d from the inspection terminal connection portion 8 input to the + input terminal and the output voltage from the + output of the determination voltage source 10 with the − output input to the − input terminal grounded. As the determination signal e, a logic 1 indicating continuity when the voltage at the + input terminal is higher than the voltage at the − input terminal is −
This is achieved by including a comparator 11 that outputs a logic 0 indicating insulation to the central control unit 5 when the voltage at the input terminal is higher.

FIG. 2 is a detailed circuit diagram of the inspection voltage applying section 7 shown in FIG. 1. From the decoder 42 to which the application terminal command signal a is input, the relay 12 in the application terminal selection relay group 43 to the relay 21 are connected. The applied relay drive signal f is individually output to the coil of each relay, and any one of the ten relays from the relay 12 to the relay 21 is driven and its contact is closed. Undriven relay contacts are open.

The common sides of the contacts of the ten relays, relays 12 to 21, are all connected to the common line and the inspection voltage c is applied.

The normally open sides of the contacts of the relays 12 to 21 are individually connected to the terminals 32 to 41, respectively.

1 corresponding to the terminal designated by the applied terminal command signal a
The relays are driven, the contacts of the relays are closed, and the inspection voltage c is applied to the designated terminal. (A terminal to which the inspection voltage is applied is hereinafter referred to as an application terminal.) FIG. 3 is a detailed circuit diagram of the inspection terminal connecting portion 8 shown in FIG. 1, in which the inspection terminal is input from the latch circuit 44 to which the inspection terminal command signal b is input. Relay 22 to relay 3 of selection relay group 45
The inspection relay drive signal g is individually output to the coils of each of the 10 relays 1 to 10 of the relay 31 from the relay 22.
One or a plurality of designated relays are simultaneously driven from among the relays, and their contacts are closed. Undriven relay contacts are open.

The common sides of the ten relay contacts of the relays 22 to 31 are all connected to the common line and output the detection voltage d.

The normally open sides of the contacts of the relays 22 to 31 are individually connected to the terminals 32 to 41, respectively.

The relay corresponding to one or a plurality of terminals designated by the inspection terminal command signal b is driven, the contacts of the relay are closed, and the detection voltage d is output from the designated terminal. (A terminal that outputs a detection voltage is hereinafter referred to as an inspection terminal.) Next, the operation of this embodiment will be described with reference to the drawings.

FIG. 4 is a conceptual diagram of inspection data creation by the central control unit 5,
FIG. 5 is a flowchart showing a wiring inspection processing procedure of the central control unit, FIG. 6 is a flowchart showing a continuity inspection processing procedure in one net by the central control unit 5, and FIG. 7 is an insulation inspection processing procedure. A flow chart, FIG. 8 is a wiring diagram of a regular inspected product, FIG. 9 is a wiring diagram of a defective inspected product, FIG. 10 is a regular wiring data and wiring number of the inspected product, and FIG. Net data created from regular wiring data and wiring numbers in FIG. 10, FIG. 12 is FIG. 10, independent terminal data created from regular wiring data and wiring numbers, and FIG. 13 is regular wiring in FIG. Leading terminal data created from the data and wiring numbers, FIG. 14 is a defective conduction terminal data detected by performing a continuity test of the defective inspection object of FIG. 9, and FIG. 15 is an independent diagram of FIG. Terminal data and beginning of Fig. 13 Child data and insulation test data created from a conduction failure terminal data in FIG. 14, FIG. 16 is the output of the inspection result of the printer of the article to be inspected with a defect Figure 9.

Here, the symbol * 1 shown in FIGS. 10 and 12 means a wiring number.

As shown in FIG. 5, the central controller controls the wiring data corresponding to the product name of the inspected product designated from the terminal 4 (see
(Fig.) Is read out from the hard disk, and only the data which forms a net by connecting a plurality of terminals with wiring is selected from the wiring data and the wiring number to create net data (Fig. 11) which becomes continuity inspection data. .

Next, independent terminal data (FIG. 12) is created by collecting only independent terminals that are not connected to other terminals. The head terminal of each net is extracted from the already created net data (FIG. 11) to create head terminal data (FIG. 13).

Next, a continuity test is performed based on the net data (Fig. 11). The continuity inspection procedure will be described with reference to FIG. 11th
In the case of the net data of (1) shown in the figure, the central control unit 5 first assigns the application terminal command signal a and the inspection terminal command signal b in order to designate the terminal 34 as the application terminal and to make the terminal 32 the inspection terminal. Output. In the case of the regular inspected product shown in FIG. 8, since there is continuity, the logic 11 is output from the comparator 11.

Next, the application terminal is set to the terminal 35 and the conduction with the terminal 32 is checked. Similarly, the application terminal is sequentially moved to the terminal 36 and the terminal 37 to check the continuity with the terminal 32. In the case of the regular inspected product shown in FIG. 8, since the net is normally constructed, the logic 1 is output from the comparator. First
Similarly, for the net of (2) in FIG. 1, the terminal 41 is designated as the application terminal and the terminal 38 is designated as the inspection terminal to confirm the conduction.

Here, a case will be described in which the continuity inspection is performed on the defective inspection object shown in FIG. First, the terminal 34 is designated as the application terminal and the terminal 32 is designated as the inspection terminal. At this time, since there is no conduction, the comparator 11 outputs a logic 0, and the central control unit 5 registers the terminal 34 in the conduction failure terminal data as the conduction failure terminal. (FIG. 14- (1)) Next, the terminal 34 is additionally set as an inspection terminal. (The inspection terminals at this point are the terminals 32 and 34.) Next, the terminal 35 is set as an application terminal and the conduction is confirmed. Similarly, only when there is a conduction failure, the application terminal at that time is additionally set as the inspection terminal and the application terminal is updated, and when there is no failure, only the application terminal is updated.

In the case of the inspected product of FIG. 9, there is no conduction even when the terminal 37 is set as the application terminal, so the terminal 37 is also registered in the conduction failure terminal data. (FIG. 14- (2)) The central control unit 5 outputs the terminal of the defective portion to the printer 3 when the continuity inspection for one net is completed and the conduction defect is detected. (FIG. 16- (1)) Next, the central control unit 5 controls the independent terminal data (FIG. 12), the head terminal data (FIG. 13), and the conduction failure terminal data (14th embodiment).
Insulation inspection data is created from the figure. In the case of the regular inspected product shown in FIG. 8, the independent terminal data and the head terminal data are combined, and in the case of the defective inspected product shown in FIG. The insulation inspection data is as shown in.

Next, the central control unit 5 executes an insulation test. The procedure of the insulation inspection is as shown in FIG. 7, but the procedure of the insulation inspection will be described by taking the inspected product of FIG. 9 as an example. First, the central control unit 5 designates the terminal 32 as the application terminal, designates all the other terminals in the insulation inspection data (that is, the terminals 33, 34, 37, 38, 39, 40) as the inspection terminals and checks the output of the comparator 11. To do. At this time, since there is conduction between the terminal 32 and the terminal 40, the comparator outputs a logic 1, so that the central control unit 5 recognizes that the terminal 32 has a poor insulation with any of the other terminals, and then the inspection terminal is connected to the terminal. Check the insulation by setting each terminal from 33 to 40. However, since it can be understood from the wiring number of the terminal data that the terminal 32, the terminal 34, and the terminal 37 are defective terminals of the same net, the above confirmation is not performed for the terminal 34 and the terminal 37. Here, when the terminal 40 is set as the inspection terminal, the comparator 11 outputs a logic 1 because there is continuity with the terminal 32. Therefore, the central control unit 5 outputs the application terminal and the inspection terminal at this time to the printer. (FIG. 16- (2)) Alternatively, the terminal 40 detected as a terminal having a poor insulation and the terminal 32 of the application terminal are deleted from the insulation inspection data. In the same manner, the applied terminals are sequentially updated to inspect for insulation failure with other terminals in the insulation inspection data.

In the case of the product to be inspected in FIG. 9, since there is continuity between the terminal 37 and the terminal 38 as well, it is detected as an insulation failure and output to the printer. (Fig. 16- (3)) When the insulation inspection of all terminals in the insulation inspection data is completed, the wiring inspection of the inspected product is completed.

The number of inspections and judgments of the inspected product shown in FIG.
However, in the case of the present embodiment, it is 16 times.

〔The invention's effect〕

The wiring inspection apparatus of the present invention detects the insulation failure location when there is a conduction failure terminal and insulation failure by storing the terminal number and the wiring number of the wiring including the terminal as a pair as the terminal data. In addition, since the inspection can be completed with the minimum necessary number of times of judgment by the comparator, there is an effect that the inspection time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of an inspection voltage applying section shown in FIG. 1, and FIG. 3 is a detailed circuit diagram of an inspection terminal connecting section shown in FIG. , FIG. 4 is a conceptual diagram of inspection data generation, FIG. 5 is a flowchart showing a wiring inspection processing procedure of the central control unit, FIG. 6 is a flowchart showing a continuity inspection processing procedure in one net, and FIG. FIG. 8 is a flow chart showing the processing procedure of the insulation inspection, FIG. 8 is a wiring diagram of a regular inspected product, FIG. 9 is a wiring diagram of a defective inspected product, and FIG. 10 is a regular wiring data of the inspected product. 1
1 is net data created from the regular wiring data of FIG. 10, FIG. 12 is independent terminal data created from the regular wiring data of FIG. 10, and FIG. 13 is the regular wiring data of FIG. FIG. 14 is a top terminal data generated from FIG. 14, FIG. 14 is a terminal data with a defective continuity detected by conducting a continuity test of the defective inspection product, and FIG. The insulation inspection data created from the leading terminal data of FIG. 13 and the conduction failure terminal data of FIG. 14, and FIG. 16 are the output of the inspection results of the defective inspected product of FIG. 9 to the printer. 1 ... Inspected product, 2 ... Hard disk, 3 ... Printer, 4 ... Terminal, 5 ... Central control unit, 6 ... Inspection voltage source, 7 ... Inspection voltage applying unit, 8 ... Inspection terminal connection Part, 9 ... Reference resistance, 10 ... Judgment voltage source, 11 ... Comparator, 12-31 ... Relay, 32-41 ... Terminal, 42 ... Decoder, 43 ... Applied terminal selection relay group, 44 ... ... latch circuit, 45 ... inspection terminal selection relay group, a ... applied terminal command signal, b ... inspection terminal command signal, c ... inspection voltage, d ... detection voltage, e ... judgment signal, f ... Applied relay drive signal, g ... Inspection relay drive signal.

Claims (1)

[Claims] 1. A wiring data storage means for storing regular wiring data and a wiring number relating to a product to be inspected, which is composed of a plurality of terminal data indicating the presence or absence of connection by wiring, and inspects any one terminal of the product to be inspected. Inspection voltage applying means for applying a voltage, inspection terminal connecting means for connecting an arbitrary terminal of the inspected product to a reference resistance, and whether the inspection voltage by the reference resistance is higher than a preset judgment voltage or not. Judgment means for judging the presence / absence of wiring between arbitrary terminals of the inspected product, pairing the terminal number of the terminal judged to have no continuity by the judgment means and the wiring number of the wiring including the terminal as terminal data Continuity test data and insulation test data are created from the poor conduction terminal storage means to be stored, the terminal data stored in the poor conduction terminal storage means, and the regular wiring data of the inspected product. Wiring comprising: inspection data creating means; and inspection result output means for collating the inspection data created by the inspection data creating means with the determination result of the determining means and outputting the content when there is an abnormality Inspection device.