JP4369949B2 - Insulation inspection device and insulation inspection method - Google Patents

Description

The present invention relates to a substrate inspection apparatus and a substrate inspection method, and more particularly, to detect a spark generated between wiring patterns in a short circuit inspection of a wiring pattern provided on a substrate and to detect a defective substrate. The present invention relates to a substrate inspection apparatus and a substrate inspection method.
The present invention is not limited to a printed wiring board, but includes, for example, electrical wiring on various substrates such as flexible substrates, multilayer wiring substrates, electrode plates for liquid crystal displays and plasma displays, and package substrates and film carriers for semiconductor packages. In the present specification, these various wiring boards are collectively referred to as “circuit boards”.

Conventionally, a substrate (circuit board) having a plurality of wiring patterns is judged by an insulation inspection device to determine whether each wiring pattern is in good insulation with other wiring patterns (whether sufficient insulation is ensured). Insulation inspection is performed to inspect whether or not the substrate is a non-defective product.
In this insulation test, a voltage is applied to one wiring pattern and the current flowing through the other wiring pattern is measured to calculate the resistance value between these wiring patterns, and the insulation state is inspected from this resistance value. To do.

In the insulation inspection as described above, immediately after a predetermined voltage (applied voltage V) is applied to the wiring pattern, the voltage between the wiring patterns is unstable and a large transient current instantaneously flows between the wiring patterns. After the elapsed time (predetermined time) when the voltage between the patterns is stabilized at the applied voltage V and the current is stabilized, the quality of the insulation state is determined.
However, since a relatively high DC voltage (applied voltage) is applied between the wiring patterns to be inspected, sparks may occur between the wiring patterns after a predetermined time elapses after the voltage is applied. . And there existed a malfunction that the insulation resistance value between wiring patterns changed by this spark.

In order to detect such a spark, an insulation inspection apparatus and an insulation inspection method capable of performing the spark detection disclosed in Patent Document 1 have been proposed.
The principle of the insulation inspection apparatus and method disclosed in Patent Document 1 is that when a spark is generated by measuring a change value of a voltage between wiring patterns during a predetermined time when an applied voltage is applied to the wiring pattern. A spark is detected by detecting a voltage drop.
For example, the graph showing the voltage change shown in FIG. 10 indicates that sparks occurred at time t21 and time t22 in the graph. Thus, by detecting the voltage change and detecting the voltage drop (value obtained by calculating “dv / dt”) due to the spark (locations A and B in the graph), the spark is detected. To detect.

Japanese Patent No. 3546046

However, in the spark detection method disclosed in Patent Document 1, a spark is detected by a voltage drop (a change amount of voltage within a predetermined time) as shown in FIG. 10, but has the following problems. It was.
The voltage drop is detected from the amount of change in voltage. For example, the voltage is measured every Δt time, and between time t23 and time t24 as shown in FIG. 10 (the time between time t23 and time t24 is Δt time). ) Is detected, the voltage change amount increases. As a result, there is a problem that the spark cannot be detected although the spark A actually occurs between the time t3 and the time t4.

  In addition, when detecting a spark, it is necessary to set a level of a voltage drop caused by the occurrence of a spark. However, it is difficult to set the level of this voltage drop. For example, when performing an insulation inspection of a substrate, the applied voltage applied for the inspection is set to 100 V or higher (usually 250 V) and the inspection is executed. The spark generated at this time has a size of approximately 10 V or less (the size of the spark B shown in FIG. 10 is approximately 10 V or less). For this reason, the voltage drop level is set to around 10V. As a result, for an applied voltage of 250 V, a voltage drop of 240 V must be detected, and a change amount of only 4% is detected, and extremely high accuracy is required. This was the reason for the above difficult problems.

  The present invention has been made in view of such circumstances, and submits a substrate inspection apparatus and a substrate inspection method that can reliably detect even a minute spark without calculating the amount of change in voltage. .

In the circuit board on which a plurality of wiring patterns are formed , the insulation inspection apparatus according to the present invention inspects between the wiring pattern set on the upstream side and the wiring pattern set on the downstream side from the plurality of wiring patterns. An insulation inspection apparatus which is selected as a target wiring pattern and performs an insulation inspection between the wiring patterns, and supplies current to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns. An upstream current supply terminal, a downstream current supply terminal connected to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns, the upstream current supply terminal, and the downstream current supply via the terminal, is arranged in series between the current supply means for supplying a voltage between the wiring pattern, the wiring pattern is set to the upstream side and the upstream current supply terminal A resistor corresponding to each of the plurality of wiring patterns, an upstream voltage detection terminal electrically connected to the wiring pattern set on the upstream side, and a downstream side corresponding to each of the plurality of wiring patterns. The downstream voltage detection terminal that is conductively connected to the set wiring pattern, the first voltage detection means that detects the voltage between the upstream voltage detection terminal and the downstream voltage detection terminal, and the inspection object Second voltage detection means for detecting a voltage between the upstream current supply terminal and the upstream voltage detection terminal corresponding to the wiring pattern, and a set value in which the voltage value detected by the second voltage detection means is set in advance And a determination means for determining that a spark is generated between the wiring pattern to be inspected and another wiring pattern.
The insulation inspection apparatus further includes a switching unit, and the switching unit brings the upstream voltage detection terminal and the upstream current supply terminal into a conductive state with the wiring pattern to be inspected , and the downstream voltage the detection terminal and the downstream current supply terminals, characterized by a conductive state and all the wiring patterns other than the wiring pattern of said object.

Further, the insulation inspection apparatus according to the present invention provides a circuit board on which a plurality of wiring patterns are formed , between the wiring pattern set on the upstream side and the wiring pattern set on the downstream side from the plurality of wiring patterns. Is an insulation inspection apparatus that performs an insulation inspection of the wiring pattern, and supplies current to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns. A downstream current supply terminal, an upstream current supply terminal corresponding to each of the plurality of wiring patterns, connected upstream to the wiring pattern set on the upstream side, the upstream current supply terminal, and the downstream current via the supply terminals, serially disposed between the current supply means for supplying a voltage between the wiring pattern, the wiring pattern is set to the downstream side to the downstream current supply terminal Resistors, corresponding to each of the plurality of wiring patterns, downstream voltage detection terminals connected to the wiring patterns set on the downstream side, and corresponding to the plurality of wiring patterns on the upstream side. An upstream voltage detection terminal that is conductively connected to the set wiring pattern, a first voltage detection means that detects a voltage between the upstream voltage detection terminal and the downstream voltage detection terminal, and the inspection object Second voltage detection means for detecting a voltage between the downstream current supply terminal and the downstream voltage detection terminal corresponding to the wiring pattern, and a set value in which the voltage value detected by the second voltage detection means is set in advance And a determination means for determining that a spark is generated between the wiring pattern to be inspected and another wiring pattern.
The insulation inspection apparatus further includes a switching unit, and the switching unit brings the downstream current supply terminal and the downstream voltage detection terminal into a conductive state with the wiring pattern to be inspected , and the upstream current the supply terminal and the upstream-side voltage detection terminal, characterized by a conductive state and all the wiring patterns other than the wiring pattern of said object.

Further, the insulation inspection method according to the present invention provides a circuit board on which a plurality of wiring patterns are formed , between the wiring pattern set on the upstream side and the wiring pattern set on the downstream side from the plurality of wiring patterns. there is selected as between wiring patterns to be inspected, a insulation test method for performing insulation test between the wiring pattern, the upstream and downstream side of the wiring pattern to be inspected from a plurality of wiring patterns on the circuit board A step of selecting, a step of electrically connecting an upstream current supply terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns, and a downstream side corresponding to each of the plurality of wiring patterns. A resistor is provided between the step of electrically connecting the downstream current supply terminal to the wiring pattern to be set, and the upstream current supply terminal and the wiring pattern set on the upstream side. A step of arranging in series; a step of supplying a voltage between the wiring patterns via the upstream current supply terminal and the downstream current supply terminal; and the upstream side corresponding to each of the plurality of wiring patterns A step of electrically connecting the upstream voltage detection terminal to the wiring pattern set in the step; a step of electrically connecting the downstream voltage detection terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns; A step of detecting a voltage between the upstream voltage detection terminal and the downstream voltage detection terminal by the first voltage detection means, and an upstream corresponding to the wiring pattern to be inspected by the second voltage detection means. A step of detecting a voltage between the side current supply terminal and the upstream voltage detection terminal, and when the voltage value detected by the second voltage detection means exceeds a preset value, Characterized in that it comprises a step of determining a spark generated between the査target wiring pattern and the other wiring patterns.
Further, the insulation inspection method according to the present invention provides a circuit board on which a plurality of wiring patterns are formed , between the wiring pattern set on the upstream side and the wiring pattern set on the downstream side from the plurality of wiring patterns. there is selected as between wiring patterns to be inspected, a insulation test method for performing insulation test between the wiring pattern, the upstream and downstream side of the wiring pattern to be inspected from a plurality of wiring patterns on the circuit board A step of selecting, a step of electrically connecting a downstream current supply terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns, and an upstream side corresponding to each of the plurality of wiring patterns. A resistor between the step of electrically connecting the upstream current supply terminal to the wiring pattern to be set and the downstream current supply terminal and the wiring pattern set on the downstream side A step of serially arranged, through the upstream current supply terminal and the downstream current supply terminals, and supplying a voltage between the wiring patterns, corresponding to each of the plurality of wiring patterns, the downstream A step of conductively connecting a downstream voltage detection terminal to the set wiring pattern, a step of conductively connecting an upstream voltage detection terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns, and A step of detecting a voltage between the upstream voltage detection terminal and the downstream voltage detection terminal by the first voltage detection means; and a downstream side corresponding to the wiring pattern to be inspected by the second voltage detection means. if it exceeds a step of detecting a voltage between the current supply terminal and the second voltage detection terminal, the set value voltage detected by said second voltage detection means is set in advance, the test Characterized in that it comprises a step of determining a spark generated between the target wiring pattern and the other wiring patterns.

According to the first and fifth aspects of the present invention, by measuring the voltage between the upstream current supply terminal and the upstream voltage detection terminal for inspecting the substrate to be inspected, the voltage change due to a minute spark can be assured. It is possible to provide a device to be inspected that can be detected.
According to the second aspect of the present invention, at the time of short circuit inspection, the upstream current supply terminal is brought into conduction with the wiring pattern to be inspected, and the downstream voltage detection terminal and the downstream current supply terminal are all other than the inspection target wiring pattern. Therefore, the spark detection can be efficiently performed by combining the wiring patterns.
According to the third and sixth aspects of the invention, by measuring the voltage between the downstream-side current supply terminal and the downstream-side voltage detection terminal for inspecting the substrate to be inspected, it is possible to reliably change the voltage due to minute sparks. It is possible to provide a device to be inspected that can be detected.
According to the fourth aspect of the present invention, at the time of short circuit inspection, the downstream current supply terminal and the downstream voltage detection terminal are brought into conduction with the wiring pattern to be inspected, and the upstream current supply terminal and the upstream voltage detection terminal are inspected. Since all the wiring patterns other than this wiring pattern are in a conductive state, spark detection can be performed efficiently by combining the wiring patterns.

The best mode for carrying out the present invention will be described.
The present invention relates to an insulation inspection apparatus and method for detecting a spark generated when an insulation inspection is performed on a plurality of wiring patterns formed on a circuit board.
FIG. 1 is a schematic configuration diagram of an embodiment of an insulation inspection apparatus according to the present invention.
The insulation inspection apparatus 1 according to the first embodiment of the present invention includes a current supply unit 2, a first voltage detection unit 3, a current detection unit 4, a second voltage detection unit 5, a control unit 6, a switching unit 7, and a current supply terminal. 8, voltage detection terminal 9 and display means 10 are provided.
In one embodiment shown in FIG. 1, an insulation inspection apparatus 1 of the present invention, a circuit board CB to be inspected, and a cocanto probe CP that electrically connects the insulation inspection apparatus 1 and the circuit board CB are shown. ing.
The insulation inspection apparatus 1 according to the first embodiment detects a spark by using a voltage difference between a current supply terminal connected to the wiring pattern P to be inspected and a voltage measurement terminal. This uses the fact that the current supply terminal and the voltage measurement terminal connected to the wiring pattern P are equipotential as long as no spark occurs.

The circuit board CB shown in FIG. 1 has four wiring patterns P1 to P4. The number and shape of the wiring patterns of the circuit board CB are appropriately set according to the designed circuit board CB.
In the circuit board CB of FIG. 1, a single-shaped wiring pattern P1, a T-shaped wiring pattern P2, and a cross-shaped wiring pattern P3 and P4 are shown.
In FIG. 1, four contact probes CP that are in electrical contact with the wiring patterns P1 to P4 are shown. The contact probe CP connects the insulation inspection apparatus 1 and the circuit board CB so as to be electrically conductive. Further, the arrangement position and the number of the contact probes CP are appropriately set according to the wiring pattern formed on the circuit board CB.
In the embodiment of FIG. 1, the upstream and downstream current supply terminals and the upstream and downstream voltage detection terminals, which will be described later, can be electrically connected to a predetermined inspection position provided on the wiring pattern with a single contact probe CP. However, each of the current supply terminal and the voltage detection terminal may be brought into contact with a predetermined inspection position by two separate contact probes CP.

The current supply means 2 applies a predetermined voltage for performing an insulation test between a wiring pattern to be inspected and another wiring pattern (hereinafter, between inspection objects).
For example, a current controller can be used as the current supply unit 2, but the current supply unit 2 is not particularly limited, and any current supply unit 2 can be used as long as a predetermined voltage can be applied between inspection targets. Can do. In the case of using a current controller, a current is supplied to a predetermined wiring pattern by the current supply means 2 which is a current controller, and a predetermined voltage is applied between inspection objects.
The voltage to be applied by the current supply means 2 is set to 200 to 250 V as described above.

The first voltage detection means 3 detects a voltage between inspection objects. For example, a voltmeter can be used as the first voltage inspecting means 3, but the first voltage inspecting means 3 is not particularly limited as long as it can detect a voltage between inspection objects.
By using the voltage value detected by the first voltage detection means 3 and the current value supplied by the current supply means 2, the resistance value between the inspection objects can be calculated. Further, by using this resistance value, it is possible to inspect the insulation between inspection objects.
The operation of the current supply means 2 is controlled according to the voltage value detected by the first voltage detection means 3.

The current detection means 4 detects a current between inspection objects. For example, an ammeter can be used as the current detection unit 4, but the current detection unit 4 is not particularly limited as long as it can detect a current value flowing between inspection objects.
Although the current value supplied by the current supply means 2 can be determined, the current value between inspection objects can also be detected by using the current detection means 4.

The current supply terminal 8 is connected to each wiring pattern P via a contact probe CP in order to supply current between inspection targets.
The current supply terminal 8 includes an upstream current supply terminal 81 that connects the upstream side (positive electrode side) of the current supply unit 2 and the wiring pattern, and a downstream side (negative electrode side) of the current supply unit 2 or the current detection unit 4 and wiring. A downstream current supply terminal 82 for connecting the pattern P is provided.
As shown in FIG. 1, an upstream current supply terminal 81 and a downstream current supply terminal 82 of the current supply terminal 8 are provided for each wiring pattern P.
Each of the upstream current supply terminal 81 and the downstream current supply terminal 82 has a switching element SW of the switching means 7, and the ON / OFF operation of the switching element SW of the switching means 7 causes the connection state / The unconnected state will be set.
The current supply terminal 8 is provided with a resistance for electrostatic discharge protection.

The voltage detection terminal 9 is connected to each wiring pattern P via a contact probe CP in order to detect a voltage between inspection objects.
The voltage detection terminal 9 includes an upstream voltage detection terminal 91 that connects the upstream side (positive electrode side) of the first voltage detection unit 3 and the wiring pattern P, and a downstream side (negative electrode side) of the first voltage detection unit 3 and wiring. A downstream voltage detection terminal 92 for connecting the pattern P is provided.
As shown in FIG. 1, the upstream voltage detection terminal 91 and the downstream voltage detection terminal 92 of the voltage detection terminal 9 are provided for each wiring pattern P.
Each of the upstream voltage detection terminal 91 and the downstream voltage detection terminal 92 has a switching element SW of the switching means 7 as in the case of the current supply terminal 8, and the switch element SW of the switching means 7 is turned ON / OFF. By the OFF operation, the connected / unconnected state is set.

As shown in FIG. 1, the current supply terminal 8 and the voltage detection terminal 9 are arranged with four terminals with respect to one contact probe CP in conductive contact with the wiring pattern P. Four switch elements SW that perform ON / OFF control are provided.
In FIG. 1, the switch element that controls the operation of the upstream current supply terminal 81 is denoted by SW1, the switch element that controls the operation of the upstream voltage detection terminal 91 is denoted by SW2, and the operation of the downstream current supply terminal 82 is represented. The switch element that controls the switching is denoted by reference numeral SW3, and the switch element that controls the operation of the downstream voltage detection terminal 92 is denoted by reference numeral SW4.

  The switching means 7 is composed of a plurality of switch elements SW that are conductively connected to the contact probes CP described above. This switching means 7 is based on an operation signal from the control means 6 described later. The ON / OFF operation is controlled.

The second voltage detection means 5 detects the voltages of the upstream current supply terminal 81 and the upstream voltage detection terminal 91. Specifically, the second voltage detection means 5 detects the voltage difference between the upstream current supply terminal 81 and the upstream voltage detection terminal 91.
As shown in FIG. 1, the second voltage detection means 5 includes a comparator 52 that calculates a difference between voltages of the upstream current supply terminal 81 and the upstream voltage detection terminal 91, and a voltmeter 51 that detects the difference. Configured.
The comparator 52 obtains the voltage difference between the upstream current supply terminal 81 and the upstream voltage detection terminal 91, and the voltmeter 51 detects this difference.
Although details will be described later, a spark between the wiring pattern P to be inspected and another wiring pattern is detected based on the voltage value detected by the second voltage detecting means 5.

  The voltage value and current value detected by the first voltage detection means 3, the current detection means 4 and the second voltage detection means 5 are given elapsed time information to the control means 6 described later (as time-series information). Sent.

The control means 6 selects the wiring pattern P to be inspected, detects a spark based on the voltage values from the first voltage detection means 3 and the second voltage detection means 5, and instructs the switching means 7 to operate. Send a signal.
The control means 6 includes a selection means 61, a determination means 62, and a storage means 63 as shown in FIG.

The storage means 63 stores information related to the wiring pattern P of the circuit board CB, information related to inspection points of the wiring pattern P, and information of detected values to be detected.
Information necessary for the insulation inspection is stored in the storage means 63, and by using these pieces of information, the insulation inspection is performed and each detected value to be detected is stored.

The selection means 61 selects the wiring pattern P to be inspected from the plurality of wiring patterns P on the circuit board CB, and specifies the wiring pattern P to be inspected. When the selection means 61 specifies the wiring pattern P to be inspected, the wiring patterns to be subjected to the insulation inspection are sequentially selected.
The selection method of the wiring pattern to be inspected performed by the selection unit 61 is exemplified by a method in which the order of wiring patterns to be inspected is set in the storage unit 63 in advance, and the wiring pattern to be inspected is selected according to this order. Can do. This selection method can adopt the method as described above, but is not particularly limited as long as the wiring patterns to be inspected are selected in order.
The selection of a specific wiring pattern performed by the selection unit 61 is performed by using the switching unit 7. For example, a wiring pattern to be inspected can be selected by performing ON / OFF control of each switch element SW of the switching means 7.
In the insulation inspection apparatus of the first embodiment, the switch element SW is turned on so that the wiring pattern to be inspected is connected to the upstream current supply terminal 81 for connection to the current supply means 2. . At the same time, the switch element SW is turned on so that the upstream voltage detecting means 91 and this wiring pattern are connected.
For example, in the embodiment shown in FIG. 1, when the wiring pattern P1 is an inspection target, the selection means 61 selects the upstream current supply terminal 81 and the upstream voltage detection terminal 91 connected to the wiring pattern P1, and these are selected. Signals that prompt the user to turn on the switch elements SW1 and SW2 of the terminals 81 and 91 are transmitted. When the switching means 7 receives this signal, the switch element SW1 and the switch element SW2 operate.
In this case, a signal is transmitted that prompts the switch SW4 corresponding to a wiring pattern other than the wiring pattern to be inspected (remaining wiring patterns) to be turned on.

As described above, the selection means 61 selects the wiring pattern P to be inspected from the plurality of wiring patterns P on the circuit board CB.
As the wiring pattern P selected by the selection means 61 of the insulation inspection apparatus 1 shown in the first embodiment, one wiring pattern P is selected from a plurality of wiring patterns formed on the circuit board CB. That is, an insulation inspection is performed between one wiring pattern P selected by the selection means 61 and all the remaining wiring patterns P.
Thus, by selecting the wiring pattern P, the insulation inspection can be processed efficiently.

The determination unit 62 determines the occurrence of spark based on the voltage value from the second voltage detection unit 5. The determination performed by the determination means 62 can be set to determine that a spark has occurred if a voltage value detected above the threshold value exceeds the threshold value. It is also possible to set so that the voltage value by the second voltage detection means 5 is compared with the voltage value in the case of a non-defective product, and the occurrence of spark is detected by the difference.
The determination means 62 can also detect a spark from the temporal change amount of the voltage value.
When a spark is detected, a message to that effect is sent to the display means 10 described later.

The control means 6 can be provided with calculation means (not shown) for detecting the size of the spark. When the determination unit 62 detects a spark, the calculation unit calculates the amount of spark energy from the voltage value, elapsed time, and the like. As a result of the calculation means, it is possible to recognize the magnitude of the spark, and to recognize the degree of the magnitude of damage to the circuit board CB.
In particular, in the spark detection method according to the present invention, since the detected voltage can be detected as a voltage change due to only the spark and the current at that time can also be detected, an accurate spark magnitude (= I × V ).

The display means 10 displays the state of insulation inspection. This display means 10 displays the discovery of the spark.
When the calculation means of the control means 6 is set to calculate the spark size, the calculated spark size is also displayed on the display means 10.
The above is description of the structure of the insulation test | inspection apparatus 1 of 1st embodiment which concerns on this invention.

Operation | movement of the insulation test | inspection apparatus 1 of this 1st embodiment is demonstrated.
First, information on the wiring pattern P of the circuit board CB to be inspected is stored in the storage unit 63.
Next, the circuit board CB is arranged at a predetermined inspection position, and a contact probe is arranged at an inspection point on the wiring pattern P formed on the circuit board CB.

When the circuit board CB is prepared, an insulation test is started.
In this case, the selection means 61 selects the wiring pattern P to be inspected. When the selection unit 61 selects a wiring pattern to be inspected, the selection unit 61 specifies the upstream current supply terminal 81 and the upstream voltage detection terminal 91 of the wiring pattern P selected as the inspection target to the switching unit 7. The Then, an operation signal is transmitted from the selection means 61 to the switching means 7 so that the switch elements SW1 and SW2 for connecting the specified upstream current supply terminal 81 and the upstream voltage detection terminal 91 are turned on. Is done.

When the switching means 7 receives a signal relating to the ON / OFF operation of the switch element from the selection means 61, ON / OFF control of the switch element SW is performed according to this signal.
For example, when the wiring pattern P1 is a wiring pattern to be inspected, the switch elements SW1 and SW2 connected to the upstream current supply terminal 81 and the upstream voltage detection terminal 91 corresponding to the wiring pattern P1 are turned ON. At the same time, since the contact probes CP that are in contact with the wiring patterns P2 to P4 other than the wiring pattern P1 are connected to the downstream current supply terminals 82, the downstream current supply terminals 82 are connected. The switch element SW4 is controlled to be turned on.
In this case, the downstream voltage detection terminal 92 corresponding to the wiring pattern P other than the inspection target may be turned on or off by the switch element SW3.

FIG. 2 is an embodiment showing the operating state of the insulation inspection apparatus according to the present invention. In the operation state shown in FIG. 2, as described above, the wiring pattern P1 is selected as an inspection target. For this reason, the switch pattern SW1 and the switch SW2 are turned on in the wiring pattern P1, and the upstream current supply terminal 81 and the upstream voltage detection terminal 91 are connected.
At this time, the wiring patterns P2 to P4 other than the inspection target are connected to the downstream current supply terminal 82 with the switch element SW4 turned ON.
As shown in FIG. 2, the upstream current supply terminal 81 and the upstream voltage detection terminal 91 of the wiring pattern P <b> 1 to be inspected are connected to the second voltage detection means 5.

When the switch element SW as described above is ON or OFF controlled, a current is applied to the wiring pattern P1 to be inspected.
At this time, the second voltage detection means 5 detects a change in the voltage value and transmits the voltage value to the control means 6 with time information relating to the voltage value.

  When the control unit 6 receives the voltage value, the determination unit 62 compares the voltage value with a predetermined threshold value. At this time, if the voltage value is larger than the threshold value, the determination unit 62 determines that a spark has occurred, and the fact is sent to the display unit 10 and displayed.

  FIG. 3 is an example showing a change in voltage value detected by the insulation inspection apparatus of the present invention. FIG. 3 (a) shows a voltage change indicating a spark state between inspection objects, and FIG. 3 (b) shows a voltage change indicating a spark detection state of the insulation inspection apparatus according to the present invention. Yes.

As described above, the insulation inspection apparatus 1 according to the present invention detects a voltage difference between the upstream current supply terminal 81 and the upstream voltage detection terminal 91, and detects a spark based on the difference.
In this case, the first voltage detection means 3 starts to supply current to the wiring pattern P1 from the current supply means 2 (time t1), and the detected voltage value increases (voltage between wiring patterns to be inspected). . Here, when the predetermined voltage value necessary for the insulation test is reached (time t3), the insulation test is executed. FIG. 3 shows that a spark is generated at time t2 during current supply and at time t4 during insulation inspection.
The second voltage detection means 5 detects the voltage between the upstream voltage supply terminal 81 and the upstream current detection terminal 91. In this case, while the current is supplied by the current supply unit 2 (time t1 to time t3), a voltage value depending on the protective resistance is detected, and when a predetermined voltage is applied between the wiring patterns (time t3). Thereafter, the voltage value becomes substantially zero.
In the case shown in FIG. 3, sparks occur at time t2 and time t4. In the insulation inspection apparatus 1 according to the first embodiment of the present invention, the second voltage detection means 5 detects a spark. However, as shown in FIG. 3, when a spark occurs, a sudden voltage change is detected. For example, if a spark occurs between time t1 and time t3 when the wiring pattern to be inspected is charged, the voltage flowing through the protective resistance increases rapidly (time t2). By detecting this sudden increase in voltage, a spark can be detected.
In addition, when a spark (spark at time t4) occurs when an insulation inspection between the wiring pattern to be inspected and another wiring pattern after the charging of the wiring pattern to be inspected is completed, The two-voltage detection means 5 detects a voltage that rises rapidly from a voltage that was substantially zero. In particular, in this case, the voltage detected by the second voltage detecting means 5 is substantially zero while no spark is generated, so that the spark detection is easily performed by the change in the voltage.

  In FIG. 3B, the determination means 62 of the control means 6 shows a threshold value for detecting a spark. For example, a two-dot chain line α (setting α) shown in FIG. 3B is set to a voltage value larger than the voltage value applied to the protective resistance between time t1 and time t3. In the case of this setting α, it is determined that a spark has occurred when the voltage value detected by the second voltage detecting means 5 exceeds the setting value α. In this case, spark detection can be easily performed by setting only the setting α.

Further, in the alternate long and short dash line β (setting β) shown in FIG. 3B, set values that are different from the time t1 to the time t3 and after the time t3 are set. In the case of this setting β, the voltage value applied to the protective resistance in the case of the charge detected by the second voltage detecting means 5 is corrected. Therefore, it is possible to detect the spark with higher accuracy by setting the voltage threshold to be changed according to the elapsed time and the voltage detection result by the first voltage detection means 3 than in the case of the setting α.
These settings α and β are appropriately set by the user, and the specific set values are appropriately set by the user because they are influenced by the resistance value of the protective resistance.

When the control means 6 determines that a spark has occurred, the display means 10 displays that a spark has occurred. At this time, the size of the spark is calculated by the calculation means.
As the magnitude of the spark calculated by the calculating means, it is possible to calculate an area where a voltage value larger than a threshold value for detecting the spark exists. For example, when calculating the size of the spark generated at time t2 shown in FIG. 3B, the size can be calculated by obtaining the area of a place larger than the set value of the setting α (FIG. 3). A portion surrounded by an alternate long and two short dashes line α and a voltage value transition (a portion indicated by oblique lines)).
The size of the spark calculated by the calculation means is also displayed on the display means 10.

As described above, when a spark occurs, it is notified that the spark has occurred, and the size of the spark is calculated, and the size is also displayed simultaneously with the spark. Therefore, the user can easily detect the spark generated during the insulation test by detecting the voltage value, and can also know the magnitude of the spark.
In this insulation inspection apparatus 1, the insulation inspection of one wiring pattern to be inspected and all the remaining wiring patterns is performed. When the insulation inspection of one wiring pattern to be inspected is completed, the following inspection object is obtained. One wiring pattern is selected, and the insulation inspection with all the remaining wiring patterns is repeated. In this way, all the wiring patterns provided on the substrate to be inspected are subjected to insulation inspection as wiring patterns to be inspected.
A substrate to be inspected in which a spark has occurred during the inspection is handled as a defective product.
The above is description of the insulation test | inspection apparatus 1 of 1st embodiment which concerns on this invention.

Next, the insulation inspection apparatus 100 of 2nd embodiment which concerns on this invention is demonstrated.
The difference between the insulation inspection apparatus 100 of the second embodiment and the insulation inspection apparatus 1 of the first embodiment is that the wiring pattern to be inspected has a higher potential (plus side (upstream side)) set between the wiring patterns. Or is connected to the low potential (minus side (downstream side)). In the insulation inspection apparatus 1 of the first embodiment, the wiring pattern to be inspected is connected to a high potential. On the other hand, in the insulation inspection apparatus 100 of the second embodiment, the wiring pattern to be inspected has a low potential. It is connected to the.
The insulation inspection apparatus 100 according to the second embodiment, like the insulation inspection apparatus 1 according to the first embodiment, detects the voltage between the voltage detection terminal and the current supply terminal connected to the wiring pattern to be inspected. , Detect a spark.

FIG. 4 shows a schematic configuration of an insulation inspection apparatus according to the second embodiment of the present invention.
The insulation inspection apparatus 100 according to the second embodiment of the present invention includes a current supply unit 2, a first voltage detection unit 3, a current detection unit 4, a second voltage detection unit 50, a control unit 6, a switching unit 7, and a current supply terminal. 8, voltage detection terminal 9 and display means 10 are provided.
In the second embodiment shown in FIG. 2, as in the first embodiment, the insulation inspection apparatus 100 of the present invention, the circuit board CB to be inspected, the insulation inspection apparatus 1 and the circuit board CB are electrically connected. A Cocanto probe CP is shown connected to.
As described above, the insulation inspection apparatus 100 according to the second embodiment detects a spark by using the voltage difference between the current supply terminal connected to the wiring pattern P to be inspected and the voltage measurement terminal. This uses the fact that the current supply terminal and the voltage measurement terminal connected to the wiring pattern P are equipotential as long as no spark occurs.
In the first embodiment, one wiring pattern is connected to the higher potential side, and all the remaining wiring patterns are connected to the lower potential side to perform an insulation test. On the other hand, in the second embodiment, one wiring pattern is connected to the lower potential side, and all the remaining wiring patterns are connected to the higher potential side to perform the insulation test. For this reason, the connection with respect to a test object is different in the first embodiment and the second embodiment. For this reason, when the structure of 1st embodiment and the structure of 2nd embodiment are the same, detailed description is abbreviate | omitted.

  The circuit board CB shown in FIG. 4 has four wiring patterns P1 to P4, like the circuit board CB shown in FIG. FIG. 4 further shows four contact probes CP that are in electrical contact with the wiring patterns P1 to P4. The contact probe CP connects the insulation inspection apparatus 1 and the circuit board CB so as to be electrically conductive.

As in the case of the first embodiment, the current supply means 2 applies a predetermined voltage for performing an insulation test between a wiring pattern to be inspected and another wiring pattern (hereinafter, between inspection objects). .
The current supply means 2 supplies current to all wiring patterns other than the wiring pattern to be inspected.

The first voltage detection means 3 detects the voltage between the inspection objects as in the case of the first embodiment.
By using the voltage value detected by the first voltage detection means 3 and the current value supplied by the current supply means 2, the resistance value between the inspection objects can be calculated. Further, by using this resistance value, it is possible to inspect the insulation between inspection objects.
The current detection means 4 detects the current between the inspection objects as in the case of the first embodiment.

As in the case of the first embodiment, the current supply terminal 8 is connected to each wiring pattern P via the contact probe CP in order to supply a current between inspection targets.
The current supply terminal 8 includes an upstream current supply terminal 81 that connects the upstream side (positive electrode side) of the current supply unit 2 and the wiring pattern, and a downstream side (negative electrode side) of the current supply unit 2 or the current detection unit 4 and the wiring. A downstream current supply terminal 82 for connecting the pattern P is provided.
As shown in FIG. 3, the upstream current supply terminal 81 and the downstream current supply terminal 82 of the current supply terminal 8 are provided for each wiring pattern P.
Each of the upstream current supply terminal 81 and the downstream current supply terminal 82 has a switching element SW of the switching means 7, and the ON / OFF operation of the switching element SW of the switching means 7 causes the connection state / The unconnected state will be set.
The current supply terminal 8 is provided with a resistance for electrostatic discharge protection.

Similarly to the case of the first embodiment, the voltage detection terminal 9 is connected to each wiring pattern P via a contact probe CP in order to detect a voltage between inspection targets.
The voltage detection terminal 9 includes an upstream voltage detection terminal 91 that connects the upstream side (positive electrode side) of the first voltage detection unit 3 and the wiring pattern P, and a downstream side (negative electrode side) of the first voltage detection unit 3 and wiring. A downstream voltage detection terminal 92 for connecting the pattern P is provided.
As shown in FIG. 3, the upstream voltage detection terminal 91 and the downstream voltage detection terminal 92 of the voltage detection terminal 9 are provided for each wiring pattern P.
Each of the upstream voltage detection terminal 91 and the downstream voltage detection terminal 92 has a switching element SW of the switching means 7 as in the case of the current supply terminal 8, and the switch element SW of the switching means 7 is turned ON / OFF. By the OFF operation, the connected / unconnected state is set.

As in the case of the first embodiment, the current supply terminal 8 and the voltage detection terminal 9 are arranged with four terminals with respect to one contact probe CP that is in conductive contact with the wiring pattern P. Four switch elements SW that perform ON / OFF control of the terminals are provided.
In FIG. 1, the switch element that controls the operation of the upstream current supply terminal 81 is denoted by SW1, the switch element that controls the operation of the upstream voltage detection terminal 91 is denoted by SW2, and the operation of the downstream current supply terminal 82 is represented. The switch element that controls the switching is denoted by reference numeral SW3, and the switch element that controls the operation of the downstream voltage detection terminal 92 is denoted by reference numeral SW4.

  The switching means 7 is composed of a plurality of switch elements SW that are conductively connected to the contact probes CP described above. This switching means 7 is based on an operation signal from the control means 6 described later. The ON / OFF operation is controlled.

The insulation inspection apparatus 100 according to the second embodiment has second switching means 71. The second switching means 71 connects the downstream current supply terminal 82 so as to be equipotential with the upstream current supply terminal 81 or is connected to the downstream side of the first voltage detection means 3 of the first voltage detection means 3. I will let you. In FIG. 4, it is connected to the downstream side of the first voltage detection means 3 and is connected in series to the current detection means 4.
As described above, the second switching unit 71 connects the downstream current supply terminal 82 connected to the wiring pattern to be inspected to the upstream side of the current supply unit 2 or the upstream side of the current detection unit 4. When connected to the upstream side of the supply means 2, it can be equipotential with the upstream current supply terminal 81.
That is, in the insulation inspection apparatus 100 of the second embodiment, all wiring patterns are charged first.
When the second switching means 71 connects the downstream current supply terminal 82 to the upstream side of the current detection means 4, the potential of the wiring pattern to be inspected drops.
For this reason, the second switching means 71 can control the level of the potential of the wiring pattern to be inspected.

In the insulation inspection apparatus 100 of the second embodiment, the potential of the wiring pattern to be inspected can be lowered by the second switching means 71, but it is preferable to provide the voltage control means 2 ′ in order to control this drop.
By providing the voltage control means 2 ′, when the potential of the wiring pattern to be inspected is lowered by the second switching means 71, the amount of the drop can be controlled. By controlling the amount of descent in this way, the potential drop time of the wiring pattern to be inspected is controlled between the wiring pattern to be inspected and other wiring patterns, and the spark is reliably detected during this descent. Will be able to.

The second voltage detection means 50 detects the voltages of the downstream current supply terminal 82 and the downstream voltage detection terminal 92. Specifically, the second voltage detection means 50 detects the voltage difference between the downstream current supply terminal 82 and the downstream voltage detection terminal 92.
As shown in FIG. 3, the second voltage detection means 50 includes a comparator 54 that calculates a difference between the voltages of the downstream current supply terminal 82 and the downstream voltage detection terminal 92 and a voltmeter 53 that detects the difference. Configured.
The comparator 54 obtains the voltage difference between the downstream current supply terminal 82 and the downstream voltage detection terminal 92, and the voltmeter 53 detects this difference.
Although details will be described later, a spark between the wiring pattern P to be inspected and another wiring pattern is detected based on the voltage value detected by the second voltage detecting means 50.

  The voltage value and current value detected by the first voltage detection means 3, the current detection means 4, and the second voltage detection means 5 are given elapsed time information to the control means 6 described later, as in the first embodiment. (As time-series information).

The control means 6 selects the wiring pattern P to be inspected, detects a spark based on the voltage values from the first voltage detection means 3 and the second voltage detection means 5, and instructs the switching means 7 to operate. Send a signal.
As in the case of the first embodiment, the control means 6 performs spark detection based on the voltage values from the first voltage detection means 3 and the second voltage detection means 50, and transmits an instruction signal for the operation of the switching means 7. To do.
The control means 6 includes a selection means 61, a determination means 62, and a storage means 63 as shown in FIG.

The selection means 61 selects the wiring pattern P to be inspected from the plurality of wiring patterns P on the circuit board CB, and specifies the wiring pattern P to be inspected. When the selection means 61 specifies the wiring pattern P to be inspected, the wiring patterns to be subjected to the insulation inspection are sequentially selected.
The selection method of the wiring pattern to be inspected performed by the selection unit 61 is exemplified by a method in which the order of wiring patterns to be inspected is set in the storage unit 63 in advance, and the wiring pattern to be inspected is selected according to this order. Can do. This selection method can adopt the method as described above, but is not particularly limited as long as the wiring patterns to be inspected are selected in order.
The selection of a specific wiring pattern performed by the selection unit 61 is performed by using the switching unit 7. For example, a wiring pattern to be inspected can be selected by performing ON / OFF control of each switch element SW of the switching means 7.
In the insulation inspection apparatus 100 of the second embodiment, the switch element SW3 corresponding to the wiring pattern to be inspected is turned on. At this time, the switch element SW4 may be turned on.
For the remaining wiring patterns that are not selected for inspection, the switch elements SW1 and SW2 corresponding to the wiring patterns are turned on.

  The control means 6 also controls the operation of the second switching means 71 and controls the potential of the wiring pattern to be inspected as described above.

For example, in the embodiment shown in FIG. 5 or FIG. 6, the case where the wiring pattern P1 is an inspection target is shown. In this case, the selection means 61 selects the downstream current supply terminal 82 and the downstream voltage detection terminal 92 connected to the wiring pattern P1, and signals the switch elements SW3 and SW4 of these terminals 82 and 92 to be turned on. Send.
When the switching unit 7 receives this signal, the switch element SW3 and the switch element SW4 operate.
At the same time, a signal that prompts the switch elements SW1 and SW2 corresponding to wiring patterns other than the wiring pattern to be inspected (remaining wiring patterns) to be turned on is transmitted.

As described above, the selection means 61 selects the wiring pattern P to be inspected from the plurality of wiring patterns P on the circuit board CB.
As the wiring pattern P selected by the selection means 61 of the insulation inspection apparatus 100 shown in the second embodiment, one wiring pattern P is selected from a plurality of wiring patterns formed on the circuit board CB. That is, an insulation inspection is performed between one wiring pattern P selected by the selection means 61 and all the remaining wiring patterns P.
Thus, by selecting the wiring pattern P, the insulation inspection can be processed efficiently.

The determination unit 62 determines the occurrence of spark based on the voltage value from the second voltage detection unit 5. The determination performed by the determination means 62 can be set to determine that a spark has occurred if a voltage value detected above the threshold value exceeds the threshold value. It is also possible to set so that the voltage value by the second voltage detection means 5 is compared with the voltage value in the case of a non-defective product, and the occurrence of spark is detected by the difference.
The determination means 62 can also detect a spark from the temporal change amount of the voltage value.
When a spark is detected, a message to that effect is sent to the display means 10 described later.

  The control means 6 can be provided with calculation means (not shown) for detecting the size of the spark. When the determination unit 62 detects a spark, the calculation unit calculates the amount of spark energy from the voltage value, elapsed time, and the like. As a result of the calculation means, it is possible to recognize the magnitude of the spark, and to recognize the degree of the magnitude of damage to the circuit board CB.

The display means 10 displays the state of insulation inspection. This display means 10 displays the discovery of the spark.
When the calculation means of the control means 6 is set to calculate the spark size, the calculated spark size is also displayed on the display means 10.

The operation of the insulation inspection apparatus 100 according to the second embodiment will be described.
First, information on the wiring pattern P of the circuit board CB to be inspected is stored in the storage unit 63.
Next, the circuit board CB is arranged at a predetermined inspection position, and a contact probe is arranged at an inspection point on the wiring pattern P formed on the circuit board CB.

When the circuit board CB is prepared, an insulation test is started.
In this case, the selection means 61 selects the wiring pattern P to be inspected.
When the selection unit 61 selects a wiring pattern to be inspected, the selection unit 61 specifies the downstream current supply terminal 82 and the downstream voltage detection terminal 92 of the wiring pattern P selected as the inspection target to the switching unit 7. The Then, the operation signal is sent from the selection means 61 so that the switch element SW3 and the switch element SW4 for connecting the identified downstream current supply terminal 82 and the downstream voltage detection terminal 92 are turned on. Sent to.

When the switching means 7 receives a signal relating to the ON / OFF operation of the switch element from the selection means 61, ON / OFF control of the switch element SW is performed according to this signal.
For example, when the wiring pattern P1 is a wiring pattern to be inspected, the switch element SW3 and the switch element SW4 connected to the downstream current supply terminal 82 and the downstream voltage detection terminal 92 corresponding to the wiring pattern P1 are turned ON.
At the same time, the contact probes CP that are in contact with the wiring patterns P2 to P4 other than the wiring pattern P1 are connected to the upstream current supply terminal 81 and the upstream voltage detection terminal 91, respectively. The switch element SW1 of the upstream current supply terminal 81 and the switch element SW2 of the upstream voltage detection terminal 91 are controlled to be ON.
In this case, the second switching means 71 operates so as to connect the downstream voltage detection terminal 92 to the upstream side of the current supply means 2 (connected to the A side in FIG. 5).
Although details will be described later, a predetermined voltage is applied to all the wiring patterns by the connection as described above.

FIG. 5 is an embodiment showing the operating state of the insulation inspection apparatus according to the present invention. In the operation state shown in FIG. 5, as described above, the wiring pattern P1 is selected as an inspection target. For this reason, in the wiring pattern P1, the switch element SW3 and the switch SW4 are turned on, and the downstream current supply terminal 82 and the downstream voltage detection terminal 92 are connected.
At this time, the wiring patterns P2 to P4 other than the inspection target are connected to the upstream current supply terminal 81 and the upstream voltage detection terminal 91 with the switch elements SW1 and SW2 turned ON.
Here, as shown in FIG. 5, the downstream current supply terminal 82 of the wiring pattern P <b> 1 to be inspected is connected to the upstream side of the current supply means 2, and the downstream voltage detection terminal 92 is one side of the second voltage detection means 50. Connected to.
When the switch element SW as described above is ON or OFF controlled, charging is started for all the wiring patterns.

When the potentials of all the wiring patterns P reach a predetermined potential, the second switching means 71 is switched to the B side (see FIG. 6). For this reason, the downstream current supply terminal 92 is connected to the second current detection means 4 and the potential of the wiring pattern P1 to be inspected is lowered. In this case, the voltage control means 2 'controls the drop (potential or drop time) of the potential of the wiring pattern to be inspected, and the wiring pattern to be inspected and other wiring patterns even during this voltage drop. A spark in between can be detected.
That is, the potential change (decrease) occurs only in the wiring pattern to be inspected, and a potential difference occurs between the wiring pattern P1 to be inspected and the remaining wiring patterns P2 to P4.
At this time, if there is an insulation failure between inspection objects, a spark occurs. Due to this spark, a current flows into the wiring pattern P1 to be inspected, so that a potential difference is generated between the downstream current detection terminal 82 and the downstream voltage detection terminal 92.
As a result, the second voltage detection means 50 detects the voltage resulting from this spark.

Next, after the second switching means 71 is switched from the switch A side to the B side and a sufficient time has elapsed, that is, the potential of the wiring pattern to be inspected decreases to substantially zero, Even if a spark occurs between inspection targets after a predetermined potential difference occurs, current caused by the spark flows into the wiring pattern P1 to be inspected. For this reason, a potential difference occurs between the downstream current detection terminal 82 and the downstream voltage detection terminal 92.
As a result, the second voltage detection means 50 detects the voltage resulting from this spark.

  When the control unit 6 receives the voltage value from the second voltage detection unit 50, the determination unit 62 compares the voltage value with a predetermined threshold value. At this time, if the voltage value is larger than the threshold value, the determining means 62 determines that a spark has occurred, and sends a message to that effect to the display means 10 for display.

  FIG. 7 shows an example of a change in voltage value detected by the insulation inspection apparatus of the present invention. FIG. 7A shows a voltage change indicating a spark state between inspection objects, and FIG. 7B shows a voltage change indicating a spark detection state of the insulation inspection apparatus according to the present invention. Yes.

As described above, the insulation inspection apparatus 100 according to the present invention detects a voltage difference between the downstream current supply terminal 82 and the downstream voltage detection terminal 92 of the wiring pattern to be inspected, and detects a spark based on the difference. .
In this case, as shown in FIG. 6, the first voltage detection means 3 increases its voltage value (to be inspected) after the current supply means 2 starts supplying current to all the wiring patterns (time t5). All wiring patterns are raised to a predetermined potential).
Here, when the predetermined voltage value necessary for the insulation inspection is reached (time t6), the second switching means 71 connects the switch to the B side in order to lower the potential of the wiring pattern to be inspected (time t7). Then, as shown in FIG. 7A, the voltage value decreases and reaches substantially zero (time t9).
At this time, as shown in FIG. 7A, when a spark occurs at time t8, a current due to the spark flows through the downstream voltage supply terminal 82. Then, a potential difference is generated between the downstream current supply terminal 82 and the downstream voltage detection terminal 92. As a result, the second voltage detecting means 50 detects the voltage of this potential difference. For this reason, when a spark occurs at time t8, the second voltage detecting means 50 detects a voltage change due to the spark.
The time between the time t6 and the time t7 is not particularly set, and is appropriately set by the user. However, it is preferable to shorten the time as much as possible in order to shorten the inspection time. The voltage control means 2 ′ controls the potential drop at time t7 and time t9.

When the voltage of the wiring pattern to be inspected becomes substantially zero, the potential difference between the inspection objects is set to a predetermined inspection voltage, and the insulation inspection is started. In this case, when no spark is generated, the second voltage detection means 50 does not cause a difference in potential between the downstream current supply terminal 82 and the downstream voltage detection terminal 92. For this reason, the second voltage detection means 50 has a potential difference of zero and detects zero voltage.
At this time, when a spark occurs between inspection targets, in this case as well, a current flows into the wiring pattern to be inspected, and the second voltage detection unit 50 detects a change in voltage.
In FIG. 7B, a spark occurs at time t10. Also in this case, the occurrence of a spark causes a current to flow into the wiring pattern to be inspected, and a voltage is generated between the downstream current supply terminal 82 and the downstream voltage detection terminal 92 due to the inflow of this current. . Then, the second voltage detection unit 50 detects this voltage and transmits a voltage value to the control unit 6.
In particular, in the case of such a spark detection, a spark (such as a time t10) generated when the potential of the wiring pattern to be inspected is reduced to obtain a predetermined voltage and a subsequent insulation inspection is performed. In this case, the second voltage detection means 5 detects a voltage that rapidly increases from a voltage that is substantially zero. For this reason, spark detection is easily performed.

  In FIG.7 (b), the determination means 62 of the control means 6 sets and shows the threshold value for detecting a spark. For example, a two-dot chain line α (setting α) shown in FIG. 7B is set to a voltage value larger than the voltage value applied to the protective resistance between time t7 and time t9. In the case of this setting α, it is determined that a spark has occurred when the voltage value detected by the second voltage detecting means 5 exceeds the setting value α. In this case, spark detection can be easily performed by setting only the setting α.

Further, in the alternate long and short dash line β (set β) shown in FIG. 7B, set values that are different from time t5 to time t7 and after time t7 are set. In the case of this setting β, the voltage value applied to the protective resistance in the case of the charge detected by the second voltage detecting means 5 is corrected. For this reason, it becomes possible to detect the spark with higher accuracy than in the case of the setting α.
These settings α and β are appropriately set by the user, and the specific set values are appropriately set by the user because they are influenced by the resistance value of the protective resistance.
In the case of this setting β, it is possible to detect the spark with higher accuracy by setting the voltage threshold to be changed according to the elapsed time and the voltage detection result by the first voltage detection means 3 compared to the setting α. become able to.

When the control means 6 determines that a spark has occurred, the display means 10 displays that a spark has occurred. At this time, the size of the spark is calculated by the calculation means.
As the magnitude of the spark calculated by the calculating means, it is possible to calculate an area where a voltage value larger than a threshold value for detecting the spark exists. For example, when calculating the size of the spark generated at time t8 shown in FIG. 7, the size can be calculated by obtaining the area of a place larger than the set value of the setting α (FIG. 7B). ) And a portion surrounded by a two-dot chain line α and a voltage value transition (a portion indicated by oblique lines)).
The size of the spark calculated by the calculation means is also displayed on the display means 10.

As described above, when a spark occurs, it is notified that the spark has occurred, and the size of the spark is calculated, and the size is also displayed simultaneously with the spark. Therefore, the user can easily detect the spark generated during the insulation test by detecting the voltage value, and can also know the magnitude of the spark.
In this insulation inspection apparatus 100, the insulation inspection of one wiring pattern to be inspected and all the remaining wiring patterns is performed, and when the insulation inspection of one wiring pattern to be inspected is completed, the next inspection target is One wiring pattern is selected, and the insulation inspection with all the remaining wiring patterns is repeated. In this way, all the wiring patterns provided on the substrate to be inspected are subjected to insulation inspection as wiring patterns to be inspected.
A substrate to be inspected in which a spark has occurred during the inspection is handled as a defective product.
The above is the description of the insulation inspection apparatus 100 according to the second embodiment of the present invention.

FIG. 8 shows a schematic configuration of an insulation inspection apparatus 101 according to the third embodiment of the present invention. The insulation inspection apparatus 101 according to the third embodiment is basically formed in the same manner as the insulation inspection apparatus 100 according to the second embodiment. However, the second switching unit included in the insulation inspection apparatus 100 according to the second embodiment. 71 is not provided.
In the insulation inspection apparatus 100 according to the second embodiment, the voltage drop of the wiring pattern to be inspected is performed using the second switching unit 71. However, in the insulation inspection apparatus 101 according to the third embodiment, the wiring to be inspected is inspected. The pattern potential is controlled by using this voltage control means 2 '.
More specifically, in the insulation inspection apparatus 101 of the third embodiment, the voltage control means 2 ′ and the current supply means 2 are set to obtain the same potential when a predetermined potential is applied to all the wiring patterns. Next, when the potential of the wiring pattern to be inspected is lowered, the voltage control means 2 'is controlled so as to have a potential lower than the potential of the current supply means 2, thereby lowering the potential of the wiring pattern to be inspected. Let
The insulation inspection apparatus 101 according to the third embodiment is the same as the inspection method except that the method of lowering the potential of the wiring pattern to be inspected is different from the case of using the second switching means 71 of the insulation inspection apparatus 100 according to the second embodiment Are the same and will not be described.
Note that the position to which the voltage control means 2 ′ of the insulation inspection apparatus 101 of the third embodiment is connected is not limited to the position shown in FIG. 8, and the downstream current detection terminal 82 of the wiring pattern to be inspected There is no particular limitation as long as the potential applied to the downstream side voltage detection terminal 92 can be controlled.

The insulation inspection apparatus 1 of the first embodiment, the insulation inspection apparatus 100 of the second embodiment, and the insulation inspection apparatus 101 of the third embodiment are set on the upstream side or the downstream side connected to the wiring pattern to be inspected. A spark is detected by detecting a voltage between the current supply terminal, the voltage detection terminal, and the terminal.
For this reason, it is possible to detect a slight voltage change caused by the spark in all three insulation inspection devices, and a more accurate inspection can be performed.
In the drawings showing the schematic configuration of the insulation inspection apparatus according to the first to third embodiments, when detecting a voltage between the voltage detection terminal and the current supply terminal, a resistance and a switch element for electrostatic discharge (ESD) protection Although configured to detect a voltage including SW, the accuracy of voltage detection can be further improved by not including the resistance of the switch element SW. In this case, for example, by providing two upstream voltage detection terminals, upstream current supply terminals, two downstream voltage detection terminals, and two downstream current supply terminals, the resistance component of the switch element SW is eliminated. Can do.

The spark detection device according to the present invention detects a spark by detecting the potential between the current supply terminal and the voltage detection terminal as described above. The current supply terminal, the voltage detection terminal, and the switch element Is not limited to the switch circuit configuration shown in FIG. For example, in the switch circuit configuration shown in FIG. 9B, based on the switch circuit configuration in FIG. 9A, the upstream current supply terminal 81, the downstream current supply terminal 82, the upstream voltage detection terminal 91, and the downstream Each of the side voltage detection terminals 92 is provided with a resistance R for electrostatic discharge protection.
Further, in the switch circuit configuration shown in FIG. 9C, the current supply terminal 8 and the voltage detection terminal 9 are each connected to one resistor R, and the upstream side and the downstream side are connected in parallel. .
Any switch circuit configuration shown in FIG. 9 can be appropriately changed by the user, and is not limited to the circuit configuration shown in FIG. 9A described in this specification.

It is a schematic structure figure showing one embodiment of an insulation inspection device concerning the present invention. It is one Embodiment which shows the operation state of the insulation test | inspection apparatus which concerns on this invention. It is one Example which shows the change of the voltage value which the insulation test | inspection apparatus of this invention detects. FIG. 3 (a) shows a voltage change indicating a spark state between inspection objects, and FIG. 3 (b) shows a voltage change indicating a spark detection state of the insulation inspection apparatus according to the present invention. Yes. The schematic structure of the insulation test | inspection apparatus of 2nd embodiment which concerns on this invention is shown. It is one Embodiment which shows the operation state of the insulation test | inspection apparatus of 2nd embodiment which concerns on this invention. A state where current is supplied to all the wiring patterns to be inspected is shown. It is one Embodiment which shows the operation state of the insulation test | inspection apparatus of 2nd embodiment which concerns on this invention. The voltage between inspection objects becomes a predetermined voltage, and shows a state where an insulation inspection is performed. It is one Example which shows the change of the voltage value which the insulation test | inspection apparatus of this invention detects, (a) has shown the voltage change which shows the state of the spark between test objects, (b) is the present invention. The voltage change which shows the state of the spark detection of the insulation inspection apparatus which concerns is shown. The schematic structure of the insulation test | inspection apparatus of 3rd embodiment which concerns on this invention is shown. The schematic block diagram of the electric current supply terminal in the spark detection apparatus of this invention, a voltage detection terminal, and a switch element is shown. It is one Example which shows a mode that the change of the voltage in the conventional spark detection apparatus was detected.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Insulation inspection apparatus 100 of 1st embodiment ... Insulation inspection apparatus 101 of 2nd embodiment ... Insulation inspection apparatus 2 of 3rd embodiment ... Current supply means 3 ... ... First voltage detection means 4 ... Current detection means 5 ... Second voltage detection means 50 ... Second voltage detection means 6 ... Control means 7 ... ··· Switching means 71 ··· Second switching means 81 ··· Upstream current supply terminal 82 ··· Downstream current supply terminal 91 ··· Upstream voltage detection terminal 92 ··· Downstream side Voltage detection terminal P: Wiring pattern

Claims (6)

In the circuit board in which a plurality of wiring patterns are formed, from the plurality of wiring patterns, between the wiring pattern set on the downstream side and the wiring pattern set on the upstream side is selected as between wiring patterns to be inspected , An insulation inspection apparatus for performing an insulation inspection between the wiring patterns,
An upstream current supply terminal for supplying current to the wiring pattern set on the upstream side, corresponding to each of the plurality of wiring patterns;
A downstream-side current supply terminal that is conductively connected to the wiring pattern set on the downstream side, corresponding to each of the plurality of wiring patterns;
Through the upstream current supply terminal and the downstream current supply terminal, a current supply means for supplying a voltage between the wiring patterns,
A resistor which is arranged in series between the wiring pattern set in the upstream and the upstream current supply terminal,
An upstream voltage detection terminal that is conductively connected to the wiring pattern set on the upstream side, corresponding to each of the plurality of wiring patterns,
A downstream voltage detection terminal that is conductively connected to the wiring pattern set on the downstream side, corresponding to each of the plurality of wiring patterns;
A first voltage detecting means for detecting a voltage between the upstream-side voltage detecting terminal and the downstream voltage detecting terminal,
Second voltage detection means for detecting a voltage between the upstream current supply terminal and the upstream voltage detection terminal corresponding to the wiring pattern to be inspected;
And a determination unit that determines that a spark is generated between the wiring pattern to be inspected and another wiring pattern when a voltage value detected by the second voltage detection unit exceeds a preset value. insulation test apparatus characterized by. The insulation inspection apparatus further includes a switching unit, and the switching unit includes:
The upstream voltage detection terminal and the upstream current supply terminal are connected to the wiring pattern to be inspected , and
The downstream voltage detecting terminal and the downstream current supply terminals, insulation inspection apparatus according to claim 1, characterized in that a conductive state and all the wiring patterns other than the wiring pattern of said object. In the circuit board in which a plurality of wiring patterns are formed, from the plurality of wiring patterns, between the wiring pattern set on the downstream side and the wiring pattern set on the upstream side is selected as between wiring patterns to be inspected An insulation inspection apparatus for performing an insulation inspection of the wiring pattern,
A downstream current supply terminal for supplying a current to the wiring pattern set on the downstream side, corresponding to each of the plurality of wiring patterns;
An upstream-side current supply terminal that is electrically connected to the wiring pattern set on the upstream side, corresponding to each of the plurality of wiring patterns;
Current supply means for supplying a voltage between the wiring patterns via the upstream current supply terminal and the downstream current supply terminal;
A resistor which is arranged in series between the wiring pattern set in said downstream side to the downstream current supply terminal,
A downstream voltage detection terminal that is conductively connected to the wiring pattern set on the downstream side, corresponding to each of the plurality of wiring patterns;
An upstream voltage detection terminal that is conductively connected to the wiring pattern set on the upstream side, corresponding to each of the plurality of wiring patterns,
A first voltage detecting means for detecting a voltage between the upstream-side voltage detecting terminal and the downstream voltage detecting terminal,
Second voltage detection means for detecting a voltage between a downstream current supply terminal and a downstream voltage detection terminal corresponding to the wiring pattern to be inspected;
And a determination unit that determines that a spark is generated between the wiring pattern to be inspected and another wiring pattern when a voltage value detected by the second voltage detection unit exceeds a preset value. insulation test apparatus characterized by. The insulation inspection apparatus further includes a switching unit, and the switching unit includes:
The downstream current supply terminal and the downstream voltage detection terminal are connected to the wiring pattern to be inspected , and
4. The insulation inspection apparatus according to claim 3, wherein the upstream current supply terminal and the upstream voltage detection terminal are brought into conduction with all wiring patterns other than the wiring pattern to be inspected. In the circuit board in which a plurality of wiring patterns are formed, from the plurality of wiring patterns, between the wiring pattern set on the downstream side and the wiring pattern set on the upstream side is selected as between wiring patterns to be inspected An insulation inspection method for performing an insulation inspection between the wiring patterns,
Selecting an upstream and downstream wiring pattern to be inspected from a plurality of wiring patterns on the circuit board;
A step of electrically connecting an upstream current supply terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns;
A step of conductively connecting a downstream current supply terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns;
Placing a resistor in series between the upstream current supply terminal and the wiring pattern set on the upstream side;
Supplying a voltage between the wiring patterns via the upstream current supply terminal and the downstream current supply terminal;
A step of electrically connecting an upstream voltage detection terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns;
A step of electrically connecting a downstream voltage detection terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns;
A step of detecting a voltage between the upstream voltage detection terminal and the downstream voltage detection terminal by a first voltage detection means;
A step of detecting a voltage between the upstream current supply terminal and the upstream voltage detection terminal corresponding to the wiring pattern to be inspected by the second voltage detection means;
And determining that a spark has occurred between the wiring pattern to be inspected and another wiring pattern when the voltage value detected by the second voltage detecting means exceeds a preset value. Insulation inspection method characterized by. In the circuit board in which a plurality of wiring patterns are formed, from the plurality of wiring patterns, between the wiring pattern set on the downstream side and the wiring pattern set on the upstream side is selected as between wiring patterns to be inspected An insulation inspection method for performing an insulation inspection between the wiring patterns,
Selecting an upstream and downstream wiring pattern to be inspected from a plurality of wiring patterns on the circuit board;
A step of conductively connecting a downstream current supply terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns;
A step of electrically connecting an upstream current supply terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns;
Placing a resistor in series between the downstream current supply terminal and the wiring pattern set on the downstream side;
Supplying a voltage between the wiring patterns via the upstream current supply terminal and the downstream current supply terminal ;
A step of electrically connecting a downstream voltage detection terminal to the wiring pattern set on the downstream side corresponding to each of the plurality of wiring patterns;
A step of electrically connecting an upstream voltage detection terminal to the wiring pattern set on the upstream side corresponding to each of the plurality of wiring patterns;
A step of detecting a voltage between the upstream voltage detection terminal and the downstream voltage detection terminal by a first voltage detection means;
A step of detecting a voltage between the downstream current supply terminal and the downstream voltage detection terminal corresponding to the wiring pattern to be inspected by the second voltage detection means;
And determining that a spark has occurred between the wiring pattern to be inspected and another wiring pattern when the voltage value detected by the second voltage detecting means exceeds a preset value. Insulation inspection method characterized by.

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