JPS58165065A - Wire inspector for printed circuit board - Google Patents

Abstract

PURPOSE:To achieve an automatic checking of miswiring easily and quickly without connection of electronic components by determining the adequateness of wiring, reading luminous condition of a phosphor connected to a line whose voltage in a printed wiring is applied as desired. CONSTITUTION:Connection connector pins 4... of inspection connectors 1... connected to LED2a, 2b... are connected to terminals A1, A2... and B1, B2... of a wire to which voltage of a printed circuit board 5 is applied. The lighting condition of LEDs 2a, 2b... is read with detectors 10... having photo sensors 10a, 10b... and the results are binary coded with a coding circuit 15 of an electronic circuit 11. This code is compared with a recognition pattern written into an RAM17 according to a wiring pattern of the circuit board 5 by means of a comparison circuit 16 through a recognition pattern input switch 23 to determine the adequateness of the wiring. The result is displayed or print recorded through a control circuit 18 thereby enabling the automatic checking of miswiring easily and quickly without connection of electronic component parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiring inspection device for printed wiring boards.

Conventionally, a circuit tester or an oscilloscope has been used to check the copper foil line (wiring II) connected on a printed wiring board.However, when checking the line with a circuit tester, the line between two points Although the continuity, non-continuity, resistance value, etc. of the line can be checked, even if the line is sheeted to another line, the line between the two points is inspected as continuity, so there is no need to cover the sheet. There was a drawback that it was not possible to check. Furthermore, since only two points can be checked, the checking process is time-consuming and troublesome. On the other hand, when checking lines using an oscilloscope, after connecting electronic components to a printed wiring board, a predetermined voltage is applied and the voltage waveform of each line is nicked. If there is incorrect wiring such as wire w'-1, there is a drawback that more current than permissible will flow through the electronic/electronic parts, causing damage to the electronic parts.
If there were multiple notes on the line, there was a risk that excessive current would flow not only to the electronic components of the printed wiring board, but also to the power supply circuit or the circuits inside the oscilloscope, causing damage.

This invention was made based on the above circumstances, and its purpose is to easily and quickly check for incorrect wiring without connecting electronic components to a printed wiring board. The purpose of the present invention is to provide a wiring inspection device for printed circuit boards that is capable of
The explanation will be based on. In FIG. 11, numeral 1 shows an external perspective view of an inspection connector for wiring inspection according to the present invention, and this inspection connector has an outer panel similar to an IC (integrated circuit) package. In other words, for example, ceramics etc.
1 device body formed into a rectangular parallelepiped using i material? A pair of light emitting diodes 2.2 facing each other are embedded in both sides of the top surface in the vertical direction at predetermined intervals with their light emitting surfaces exposed on the top surface. Further, a common connection pin 3 as a connection electrode terminal is led out from the side surface of the detection connector main body 1a in the lateral direction.

Furthermore, a pair of connector pins 4.4 are provided at predetermined intervals on both sides of the main body 1af) in the vertical direction, corresponding to the light emitting diodes 2.2, respectively. The connecting connector pin 4 is molded from a conductive metal material, and a pin hole 4& for inserting the common connection pin 3 is provided at the attachment portion to the device body 1&.

FIG. 2 shows a cross-sectional view of the test connector 1, in which one electrode of each light emitting diode 2 is connected to the corresponding connector pin 4 for connection. Furthermore, the other electrode of each light emitting diode 2 is connected to the common connection bin 3 by a conductive member, respectively.

FIG. 3 shows an internal circuit configuration 111 of the foreboard inspection connector 1, in which each of the connection connector bins 4 is connected to the anode electrode 2A &: of the corresponding light emitting diode 2, and the cathode electrode 2BI or They are collectively connected to each other and further electrically connected to the common connection bin 3.

FIG. 14 shows a printed wiring board 5 whose wiring is inspected by one inspection connector 1. As shown in FIG.

That is, electronic component mounting parts A, B, and C for mounting an IC are provided at predetermined positions on the printed wiring board 5, and each of these mounting parts A, B, and C has a mounting hole for mounting an IC. 6 are provided correspondingly to each other. Thus, each connection connector pin 4 of the inspection connector 1 is inserted into each mounting hole 6 of the printed wiring board 5 during wiring inspection, that is, each of the inspection connectors 1 is inserted into each electronic component mounting portion A, B1C. They are designed to be installed respectively. Then, with the inspection connector 1 attached, it is checked whether the wiring on the printed circuit board 5 is correct.

FIG. 5 shows a schematic system configuration diagram of the wiring inspection apparatus of the present application, and reference numeral 7 denotes a conveyance persi driven by a motor (not shown). This conveyor belt 7 is provided with positioning protrusions 7 & at regular intervals, and these protrusions 7 a
A printed wiring board 5 with patterned wiring is placed on the conveyor belt 7 between e7a, and a grounding electrode 7m+ is attached to a predetermined location on the upper surface of the conveyor belt 7. They are wired together and connected to the negative electrode of the battery 8. The positive electrode of this battery 8 is connected to a test terminal 9. On the other hand, detection ato, to, and to are arranged at predetermined positions directly above the transport door, and the light emitted from the light emitting diode 2 of the inspection connector 1 is received here.
It is converted into an electrical signal and sent to the electronic circuit 11. The electronic circuit 11 receives the electrical signal and also receives a control signal 0.0 to move the test terminal 9 to the next connection connector bin 4 of the connector 1. I/! output to the lA structure control unit 12,
Furthermore, when the inspection of all lines of printed fs boards S is completed, a control signal O7 is output to the mechanism control section 13. Each time the control signal 01 is input, the mechanism control section 12 moves the inspection terminal 9 in a predetermined order and electrically connects the tip to the connection connector pin 4. Furthermore, the mechanism control unit 13 receives the input control signal 0! Accordingly, the motor is driven to move the conveyor belt 7 by a predetermined length, that is, the length between the protrusions 7m and 7a.

Figure #1!6 shows a circuit configuration diagram of the above-mentioned wiring inspection device, and shows the electronic component mounting portions m, m, and m of the printed wiring board 5.
There is an inspection connector in each mounting hole 6 of c.

The connector pins 4 for each connection of 1.1 are inserted.

Then, the terminals 1 to 1 of each mounting hole 6 of the wiring board S
The twin wires connected between C @ shall be inspected.
In this case, the printed wiring board 5 is provided with printed wiring as shown by reference numeral 14 indicated by a dashed line in the figure. That is, the 1m terminals 4-1h-Ct are connected to each other to form a GND line, and the terminals, ., 11., and C1, are connected to each other to form a VDD line, and Terminal A, and terminal C8, terminal A
, terminal B, terminal A4, terminal B1, and terminal C- are integrated with each other and correspond to signal lines L, , L, S.
They are wired as L, respectively. Here, each of the light emitting diodes 2 of the test connector 1.1 corresponds to the terminals A1 to C and will be referred to as light emitting diodes 21 to 1m. The detector 10.1010 is provided with a photon +10a~10m corresponding to the light emitting diode 2&~2 layer. The detection signal output from the detector 10.10.10 is indicated by the dashed line. Encoding circuit 1s in the enclosed electronic circuit 11
is input. This encoding circuit 15 performs code conversion of the input detection signal and converts the light emitting diode 2 that is lit.
The light emission state data indicating this is sent to the comparator circuit 16. This comparison circuit 16 receives liIwA sent from the RAM 17.
Pattern data is input, and here the ai@ pattern data and the light emission state data are compared, and if they match, a match signal y is sent to the control circuit, and if they do not match, a mismatch signal n and mismatch data are sent to the control circuit. Output to 18. The control circuit 18 sends the next address signal ==4 to the RAM control circuit 1g each time the match signal y and the mismatch signal n are input.
This control also sends the control signals O8 and II to the mechanism control section 12. Further, when the coincidence signal y is input, the control circuit 18 sends a display signal to display "OKJ" on the display section 20&.
When mismatched data is input, the control circuit 18 outputs a display signal to display "NGJ" indicating incorrect wiring on the display section 20b.Furthermore, the control circuit 18 sends the mismatched data to the printing section 21, and the printing section 21 outputs the same display signal. Data is printed.

The RAM control circuit 1g updates the next address each time the control signal is input, and this updated next address signal is output to the memory M17 to designate the next address.

When a start signal is input to the start switch 22, the multiple RAM control circuit 1 specifies the first address of the RAMI 7 and starts reading out the ll11m pattern data in the RAM 17. Heavy, RAM control circuit 19
performs control to write the introduction pattern data input in response to the operation of the pattern input switch 23 into the corresponding storage area of the wing M17. The RAM 17 is RA
The recognition pattern data sent from the M control circuit 19 is stored, and the stored data is sent to the comparison circuit 16 in accordance with the input address signal.

Next, the operation of the wiring inspection device described above will be explained.

Now, for example, the power line VDD of the printed wiring board 5
and signal lines t, , II t, -Lm shall be checked. Prior to this check, the inspection connector 1 is attached to the printed wiring board 5, and the common connection pin 3 of the inspection connector 1.4゜1 is connected to the corresponding terminal A.
I. Push it into the via hole 41 of the connecting connector vial 4 electrically connected to Bla C1. After this, the conveyor belt 7
The printed wiring board 5 equipped with the test connector 1.1.1 is placed between the protrusions 71.71, and its T-in terminal is electrically connected to the electrode 5. Then, the electrode of the battery 8 and the GND line of the printed wiring board 5 are electrically connected. On the other hand, the recognition pattern data "A" of the signal line L1 is checked by operating the Wtl11 pattern input switch 23.
2.0. Input c2J sequentially. Then, the same data is R
The data is written through the AM control unit 19 to the storage area specified by the row address a of the RAM 17. Similarly, signal line Ll
! @ Recognition pattern data “A3゜BS, OJ,” “A4.A12.O” corresponding to the 14s power supply line VDD, respectively.
When inputting J, [A 16 , l116, and C16J sequentially, each data is stored in RAM 170 row addresses b, a, and
It is written to the storage area specified by i.

When the starship switch 22 is operated after the above-mentioned operation, the RAM control unit 19 also outputs the RAM 17 hair □ drive number, designates the address of the RAM 17, and outputs its lI@pattern data ``, □ A2.020'2J is read out and sent to the comparator circuit 16. At the same time, the mechanism control section 12 is driven, and the test terminal 9 is connected to the terminal A and the connecting connector bin 4 electrically connected. As a result, one signal line L
1 is the voltage of the electric current [8 is applied, the power supply 86 nose diode 2bq common connection bin 3, the terminal is closed by the power supply 8 11
-, a power supply 8, a signal line L1, a terminal C3, a light emitting diode 2hs connection, 11) a closed circuit is formed by a connection bin 3, a GND line, and □1'm*s. Therefore, if there is no abnormality in the light emitting diodes 2 and 2, the light emitting diodes 2 and 2 m will turn on, and the others will turn off. Detector 10.10.10 7 otosen t10&
~1Gm is detected, and the light emission state data "M2°C2J" indicating the lighting of the light emitting diodes 2b and 1h is sent to the comparison circuit 15 via the encoding circuit 14.Then, the comparison circuit 15 compares the light emission state data and the When the recognition pattern data is compared and a matching signal y is output to the control circuit 18 for both data, the control circuit 18 displays "OK" on the display section 201.
” and outputs the display signal “RAmlIK control unit 1
9 to update the address of the RAM 17. At the same time, the mechanism control section 12 is driven by the control signal O3 outputted from the control circuit 18, and the inspection terminal 9 is electrically connected to the connecting connector pin 4 electrically connected to the terminal As, and the same as described above is performed. Signal line L! +7)
:Check is carried out (the above-mentioned signal) If there is an abnormality in the input L1 and the light emitting diodes 2b, 2d, 72g, and 2j are turned on and the other light emitting diodes are turned off/I, this lighting state will be Detector 1o @"1-o"', S10
．． After passing through the encoding circuit 15, the light emission state data "A2.A
4. ! 12. It is sent to the comparator circuit 1-6 as c3J. Here, input recognition pattern data “A2.c2
J, and the mismatch data “C2
", "A4.B12.c3J are output to the control circuit 18. Then, the control circuit 18 outputs a display signal of "NGJ" indicating an abnormality to the display section 20b, and further displays the mismatch data "
C2'', [A4. ]I2. c3J are outputted from the printing section 21, respectively. As shown in FIG. 8, the printing unit 21 prints the mismatched recognition pattern data "C2" and then prints the mismatched light emission state data [A4, B2 . Print C3J all at once. Among this printed data, the recognition pattern data “
'c2J is a signal! 1 Ls is disconnected, that is, the connection between terminal C and terminal A is disconnected. 1J and C3J indicate a state in which the signal 11Lt crosses another line, that is, a state in which the signal #LI and the signal line L1 are connected.

When this printing is completed, the control circuit 18 outputs control signals to the RAM control section xl and mechanism control section 12, respectively, and checking of the line Lm is started.

The same checking operation as described above is also performed for line L, and the recognition pattern data "M3." in the RAM 17 is checked.
115J is read out and compared with the light emitting state data regarding the signal line L in the comparison circuit 16, display or printing is performed according to the comparison result, and then R
At the same time as the address of AMI 7 is updated, the test terminal 9 moves to the checkerboard □ with the signal line Ls. Signal mLss Subsequently, the check operation of the power supply line VDD is completed, and as a result, the check of the signal lines L1 to LS% power supply line Vf)D of the printed wiring board 5 located directly under the detector 10.10.10 is "all". Upon completion, the control signal 0. is output together with the control signal 01 from the control circuit 18.Then, the address specifying the RAMI 7 and the position of the test terminal 96 return to their original initial state, and ,
The mechanism control unit 13 is driven, and the conveyor belt 7 moves between the protrusions 7 &
, 7"""a, and as a result, the final checked printed circuit board Is-board 5 moves to the detector 10.10.
．． 10, and a new check operation for this printed circuit board 5 is started. In this way, the checking operation of the printed wiring board 5 is performed sequentially, and only when there is an abnormality in the line, the abnormal state is classified into disconnection, mismatched recognition pattern data, and light emitting state data that respectively indicate the sheet. As described above, according to this embodiment, since the configuration is such that the Zhu Qian pattern data corresponding to the twin to be checked can be stored in the RAM 17, it is possible to check the lines of any wiring pattern. It is highly versatile because it can be used.

Note that in the above example, the light emitting diode 2h to f1mm of the printed wiring board inspection connector 1.1.1
Detectors io, to, io's 7 adult senna lea~Io
Although the number of detectors 4910 is provided in one-to-one correspondence, the present invention is not limited to this, and it is also possible to provide one detector 4910 and sequentially visit each inspection connector 1 to perform detection. It is also possible to sequentially move the light emitting diode to each light emitting diode 2 &~2 sets. In short, it is only necessary to be able to detect whether all of the light emitting diodes 2 and 2 are lit or not, and for that purpose, it is necessary to perform other tests to inspect other light emitting bodies other than light emitting diodes and photosennas and their light emitting states. A device may also be used.Also, the inspection terminal 9
is configured to move automatically by the drive of the mechanism control section 12, but the electronic circuit 11. is moved after the test terminal 9 is moved by the drive. It is also possible to start the check operation of the line immediately. In this case, a line switch is provided corresponding to each line to be checked, and when the line switch 4: is operated, the corresponding recognition in the RAM 17,
It is also possible to output pattern data.In addition, in the embodiment described above, "NG" is displayed on the display section 19b.
If J is displayed, the discrepancy data is printed on recording paper and used as a reference for repairing the abnormal line after all checks have been completed, but this is not limited to 1. CIET<optical character display device), LCD (liquid brown display device, device), -
Use the song to give a reward.
・,-Well, the above embodiment] ← is "N
Although the configuration is configured so that the automatic road check operation is executed even when a GJ is detected, the system is not limited to this.
” is detected, the inspection may be automatically stopped, and after repairing the line with the abnormality, the check operation may be continued from the line where it was stopped again. At this time, the display Terminal 1 of wiring board S
It is convenient to provide indicators corresponding to C1 and to turn on the indicator corresponding to the terminal of the abnormal line so that the failure location can be immediately seen.

In addition, in the above embodiment, the signal line L is connected to the signal line AM17.
l m L@@Ls, I stored the recognition pattern data to be checked for the power supply twin VDD, but the RAM17
Let me remember it! The lil bar data can be set to 'self' depending on the twin being checked.

Further, in the above embodiment, the connector pins 4 for connecting the test connector 1 are inserted into each mounting hole 6 of the printed wiring board 5 to be mounted, but the mounting location of the connector 1 is not limited to this, and for example, After attaching an IC (integrated circuit) to the printed wiring board 5, attach the connecting connector pins 4 corresponding to each terminal of this IC.As explained above, according to the present invention, the printed wiring board A voltage is applied to any line of the line, a voltage is applied to cause only the light emitting bodies connected to this line to emit light, and the light emitting state of at least the light emitting body to which the voltage is applied is read and the light emitting state data is output. Since we have decided whether the light emitting state data is correct or not and notified the result, it is possible to check for incorrect wiring without connecting electronic components to the printed wiring board. Therefore, electronic components will not be damaged during the checking process.

In addition, you can automatically check for incorrect wiring all at once by simply attaching a connector pin to the electronic component mounting hole where the IC lead is attached and applying a low voltage, for example, 1.5V battery voltage. Therefore, the checking work is easy and the checking time can be shortened. In addition, checking for incorrect wiring has the advantage that wiring stamps can also be inspected in addition to inspecting for disconnections. Also, depending on the display of the light emitting element? Since it is checked logically, the inspection is simple and clear, and erroneous checks can be prevented. Furthermore, since the check for one connection is automatically performed, the check can be performed in a concentrated manner, reducing the burden on the checking operator.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a test connector showing one implementation of the present invention. Fig. 2 is a cross-sectional view of the test connector. Fig. 3 is an internal circuit diagram of the test connector. 5 is a schematic configuration diagram of the wiring inspection device, FIG. 6 is a circuit configuration diagram of the wiring inspection device, No. 781 is a storage state diagram of skin M, and FIG. 8 is a printed stm. 1...Inspection puncta, 2.2a~double...
...Light emitting diode, 3...Common connection bin,
4... Connector tubin for connection, G... Printed wiring board, 7... Conveyor belt, 8...
...Electric noodles, 9...Test terminal, l':- O...Detector, 10&~10■......□
7o) Sensor, 11...Electronic circuit, ts, j4
5p... Encoding circuit, 16..., 11... Comparison circuit, 17... RAM, i@...
... Control circuit, 1.1 ... Wing support control circuit,
20 k h 20 b...Display section, 21...
...Printing section, 23...ll! lW/I4 pattern input switch. Figure 1 Figure 2 Figure 4 et al.

Claims (1)

[Claims] A printed wiring board for inspecting the wiring condition of the printed wiring by electrically connecting a light emitting body to II number of locations on a printed wiring formed on a substrate and applying a voltage to read the light emitting state of the light emitting body. 1. An inspection device for an S-board, comprising a voltage applying means for applying a voltage to an arbitrary line of the printed wiring and causing only a light emitter connected to this line to emit light; At least 8 optical reading means for reading the light emitting state and li of the light emitting body to which a voltage is applied by the voltage applying means and inputting the light emitting state data, and the light emitting state data outputted from the optical reading means. A wiring inspection device for a printed wiring board, characterized in that it is equipped with a determining means for determining whether the wiring is correct or not, and an alarm that notifies you based on the determination result by the determining means.