JP4059291B2 - Insulation inspection apparatus and insulation inspection method - Google Patents

Description

  The present invention relates to an insulation inspection apparatus and an insulation inspection method, and more particularly, to an insulation inspection apparatus and an insulation inspection method capable of quickly and accurately performing an insulation inspection of a circuit board on which a plurality of wiring patterns are formed.

  Conventionally, an insulation inspection of a circuit board having a plurality of wiring patterns is performed by determining whether the insulation state between the wiring patterns is good or not (whether sufficient insulation is ensured). Or whether it is a defective product.

  In such a conventional insulation inspection apparatus, a resistance value between wiring patterns is calculated by applying a relatively high voltage (for example, 200 V) between two wiring patterns to be inspected, and this resistance value is calculated. Based on this, the quality of the insulation state was judged.

  However, in such a conventional insulation inspection apparatus, since inspection is started when a predetermined time has elapsed after application of a predetermined voltage, a spark is generated while the predetermined voltage is applied. In other words, an inaccurate resistance value is calculated, and the quality of the insulation state cannot be accurately determined.

In order to solve such problems, the present inventor has created an insulation inspection apparatus and method disclosed in Patent Document 1 filed earlier.
Patent Publication No. 3546046 (issue date: July 21, 2004) In the insulation inspection apparatus and method disclosed in Patent Document 1, a predetermined DC voltage is applied between a pair of wiring patterns, and a predetermined DC voltage is applied from the start of application. By detecting a voltage changing up to a voltage value, a spark is detected from the voltage change, and a spark is detected by detecting a voltage drop at the time of occurrence of the spark. Thus, by detecting a voltage change during the rising period of the applied voltage, a spark can be detected, and the above-described problems can be solved.

  However, this Patent Document 1 does not include a description relating to an inspection regarding a spark condition or the like.

  Therefore, in consideration of the state of the spark and the like, there has been a demand for the creation of an insulation inspection apparatus and an insulation inspection method that can be more accurately inspected in connection with the spark of the circuit board.

  It is an object of the present invention to provide an insulation inspection apparatus capable of performing a more accurate inspection in connection with the spark of a circuit board.

It is another object of the present invention to provide an insulation inspection method capable of performing a more accurate inspection in connection with a circuit board spark.
More specifically, the purpose of this divisional application is to grant rights to the invention disclosed in the embodiment (particularly paragraph numbers 0110 to 0111) disclosed in [Alternative Example] (6) described later.

In view of the above-described object, an insulation inspection apparatus according to the present invention is an insulation inspection apparatus that performs an insulation inspection of a circuit board on which a plurality of wiring patterns are formed, and one wiring to be inspected from the plurality of wiring patterns. A selection means for selecting a pattern as a first inspection unit and selecting as a second inspection unit by connecting all wiring patterns to be inspected other than the first inspection unit in parallel, the first inspection unit, In order to set a predetermined potential difference between the second inspection section and the second inspection section, the power supply means is connected to the second inspection section and applies a voltage to the second inspection section, and the second inspection section is connected in parallel. The current detection means connected in series with the current detection means, the current value detected by the current detection means flowing between the first inspection section and the second inspection section is compared with a predetermined reference value, and this comparison result The circuit board is And a determination means as good.

Furthermore, an insulation inspection apparatus method according to the present invention is an insulation inspection apparatus method for performing an insulation inspection of a circuit board on which a plurality of wiring patterns are formed, wherein one wiring pattern to be inspected is selected from the plurality of wiring patterns. Selecting as the first inspection unit, selecting all the wiring patterns to be inspected other than the first inspection unit in parallel and selecting as the second inspection unit; and the first inspection unit and the second inspection In order to set a predetermined potential difference between the second inspection unit and a voltage applied to the second inspection unit, and a current to the second inspection unit connected in parallel. A step of connecting the detection means in series, and a current value detected by the current detection means flowing between the first inspection section and the second inspection section is compared with a predetermined reference value, and the circuit is determined by the comparison result. Good substrate And determining as defective.

  Furthermore, the recording medium according to the present invention selects, as a first inspection unit, one wiring pattern to be inspected from the plurality of wiring patterns for a computer that performs insulation inspection of the circuit board on which the plurality of wiring patterns are formed. And a step of connecting all the wiring patterns to be inspected other than the first inspection part in parallel and selecting them as a second inspection part, and a predetermined interval between the first inspection part and the second inspection part. In order to set the potential difference, a step of applying a voltage to the second inspection unit while being connected to the second inspection unit, and a current detection means are connected in series to the second inspection unit connected in parallel. The current value flowing between the first inspection unit and the second inspection unit detected by the step and the current detection unit is compared with a predetermined reference value, and the circuit board is determined to be a good product or a defective product based on the comparison result. Size The method comprising a readable medium having thereon computer circuit board insulation test method program for executing.

  ADVANTAGE OF THE INVENTION According to this invention, the insulation test | inspection apparatus which can test | inspect more accurately in connection with the spark of a circuit board can be provided.

  Furthermore, according to the present invention, it is possible to provide an insulation inspection method capable of inspecting more accurately in connection with the spark of the circuit board.

  Embodiments of an insulation inspection apparatus and an insulation inspection method according to the present invention will be described below with reference to the accompanying drawings. In addition, in the figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  The term “circuit board” described in this application document is not limited to a printed wiring board, but includes, for example, flexible boards, multilayer wiring boards, electrode plates for liquid crystal displays and plasma displays, package boards for semiconductor packages, film carriers, and the like. The board | substrate with which various wiring is given is named generically. That is, the circuit board includes all boards that can be subjected to insulation inspection.

[Insulation inspection equipment]
FIG. 1 is a diagram for explaining an example of a schematic configuration of an insulation inspection apparatus 1 according to the present invention. Here, the insulation inspection apparatus 1 is composed of elements obtained by removing the circuit board 10 to be inspected from the elements shown in FIG. That is, the insulation inspection apparatus 1 includes a control means 9, a display means (monitor) 8, a switch group SWs, a power supply means 3, a first current detection means 4, a second current detection means 5, and a voltage detection means. 6 is provided. The control means 9 includes selection means (also referred to as “SW switching control means”) 2, determination means 7, and storage means 10. The control means 9 is composed of a normal computer, the selection means 2 and the determination means 7 are composed of its CPU, and the storage means 10 is composed of a ROM, a working memory RAM, etc. for storing a computer program for executing this insulation inspection method. . The switch group SWs has a plurality of pairs of a pair of switches SW1 and SW2.

  On the other hand, conductive patterns P1 to P5 (collectively referred to as “P”) are formed on the circuit board 10 to be inspected. In order to simplify the drawing and make it easier to understand, the figure shows five types of wiring patterns as a pattern P: linear wiring patterns P1, P2, T-shaped wiring pattern P3, and cross-shaped wiring patterns P4, P5. Only examples. Here, in the circuit board 10 which is a good product, each of the patterns P1 to P5 is in an electrically independent state and maintains a predetermined insulation resistance between adjacent patterns.

  The insulation inspection apparatus 1 has a plurality of contact pins CP connected to each set of SW1 and SW2 constituting the switch group SWs, and each contact pin is electrically connected to each wiring pattern P1 to P5 of the circuit board 10, respectively. It is possible to inspect the insulation state or conduction state of each wiring pattern.

  The basic principle of the inspection performed by the insulation inspection apparatus 1 is that the pattern P of the circuit board 10 is selected as the first inspection portion T1 and the second inspection portion T2 according to a predetermined rule, and a predetermined voltage is applied to the second inspection portion T2. By detecting the current flowing through the first inspection unit T1 in a state where a predetermined potential difference is generated between the first inspection unit T1 and the second inspection unit T2, a more accurate inspection relating to spark is performed. Is. Here, the first inspecting unit is also referred to as one (single) wiring pattern (“inspected pattern”) to be inspected selected from a plurality of wiring patterns (P1 to P5 in the figure) of the circuit board 10. Say). The second inspection part T2 is composed of all remaining wiring patterns to be inspected other than the first inspection part T1 (also referred to as “all patterns other than the pattern to be inspected”). In the inspection, a plurality of wiring patterns of the circuit board 10 are sequentially selected as the first inspection unit, and an insulation inspection is performed with the second inspection unit each time, and all the wiring patterns are selected as the first inspection unit. Exit when inspected.

  Hereafter, each element which comprises the insulation test | inspection apparatus 1 is demonstrated. The selecting means 2 selects one wiring pattern to be inspected as a first inspection portion (inspected pattern) T1 from among a plurality of wiring patterns that the circuit board 10 has. At the same time, all the remaining wiring patterns to be inspected other than the wiring pattern that is the first inspection unit T1 are selected as the second inspection unit T2. In this state, after performing an insulation inspection between the first inspection unit T1 and the second inspection unit T2, one wiring pattern to be inspected is selected from among the patterns not yet selected as the first inspection unit T1. The first inspection unit T1 is selected, and all remaining wiring patterns to be inspected are selected as the second inspection unit T2. Hereinafter, such steps are repeated.

  A specific selection method uses a switch group SWs having a plurality of switch elements SW1 and SW2 and a selection means (SW switching control means) 2 for switching control of each switch element, and each switch element SW1 by the selection means 2 is used. , SW2 on / off switching operation is performed by selecting a plurality of wiring patterns as either the first inspection unit T1 or the second inspection unit T2.

  For example, in FIG. 2A, the uppermost wiring pattern P1 in the switch group SWs is selected as the first inspection portion (pattern to be inspected) T1, and the wiring patterns P2 to P5 other than the wiring pattern P1 are selected as the second inspection portion ( All patterns other than the pattern to be inspected) are selected as T2. FIG. 2B shows a state in which the wiring pattern P4 is selected as the first inspection part T1, and the wiring patterns P1 to P3, P5 other than the wiring pattern P4 are selected as the second inspection part T2.

  Each contact pin CP electrically connected to each wiring pattern P can be connected to the power supply means 3 via the switch SW1, and the first current detection means 4, the second current detection means 5 and the like via the switch SW2. Connection to the voltage detection means 6 is possible.

  In FIG. 2A, the wiring pattern P1 selected as the first inspection unit T1 is connected to the first current detection means 4 and the second current detection means 5 when the switch SW2 is turned ON, and further to the voltage detection means 6. Connected. The wiring patterns P2 to P5 selected as the second inspection unit T2 are each connected to the power supply means 3 when the switch SW1 is turned on. A switch SWa may be provided in front of the first current detection unit 4 and a switch SWv may be provided in front of the voltage detection unit 6, and the corresponding switch may be turned on at the time of each detection under the control of the control unit 9.

  The wiring patterns P2 to P5 selected as the second inspection unit T2 are electrically connected in parallel to each other through each SW1. By connecting in parallel in this way, all the wiring patterns P2 to P5 of the second inspection portion T2 can be made equipotential, and even if the wiring pattern has a complicated and large area, a spark is generated between the wiring patterns. Can be prevented.

  The selection of the wiring pattern P performed under the control of the selection means 2 is such that the wiring pattern P1 once selected as the first inspection unit T1 is not selected again as the subsequent first inspection unit T1. Is set to For this reason, the first inspection unit T1 sequentially selects all the wiring patterns P one by one.

  The power supply means 3 is connected so that a predetermined voltage can be applied to the second inspection portion T2 via each SW1 in order to set a predetermined potential difference between the first inspection portion T1 and the second inspection portion T2. Has been. The power supply means 3 changes the potential of the second inspection portion T2, and the second inspection portion T2 has a potential different from that of the first inspection portion T1.

  The power supply means 3 is not particularly limited as long as it can generate a predetermined potential difference between the first inspection unit T1 and the second inspection unit T2, and is either a DC power supply or an AC power supply. is not. However, in order to detect a change in current value in the first current detection means 4 described later more accurately, a variable DC power supply is preferable.

  The predetermined potential difference applied by the power supply means 3 is not particularly limited, but is preferably set so as to generate a potential difference of 1 to 10 V / μS. This is because a spark can be accurately detected in a short time by using a potential difference within this range.

  As shown in FIG. 2A, the first current detection means 4 is connected in series to the first inspection section (wiring pattern P1) T1 via the switch SW2 and the contact pin CP, and detects the current of the first inspection section T1. . The first current detection means 4 uses an ammeter that can measure a current value. The current detected by the first current detection means 4 is affected by the potential difference between the first detection unit T1 and the second detection unit T2 when a predetermined voltage is applied to the second inspection unit T2. Current flowing through the first detector T1.

  For this reason, when the current value measured by the first current detection means 4 indicates a current value greater than a predetermined value or a change in current value greater than a predetermined value, the first detection unit T1 and the second detection unit T2 It indicates that a spark has occurred in the meantime. That is, it is possible to detect a spark between the two inspection parts based on the current value measured by the first current detection means 4.

  The first current detection means 4 is not particularly limited as long as it can measure the current value when sparked, but it is preferably capable of detecting a current value of 0.1 to 10 mA. The current value detected by the first current detection means 4 is sent to the determination means 7 described later.

  The second current detection means 5 is connected in series to the first inspection unit T1 and detects the current flowing through it. The second current detection means 5 is common in that the current flowing through the first inspection section T1 can be measured in the same manner as the first current detection means 4 described above, but compared with the first current detection means 5. Thus, it is different in that it has the ability to measure a smaller current.

  By having the second current detection means 5, the value of the current flowing between the first inspection part T1 and the second inspection part T2 can be reliably measured. The resistance value between the inspection part T1 and the second inspection part T2 can be calculated.

  The current measurement capability of the second current detection means 5 is particularly limited as long as the current value necessary for calculating the resistance value between the first and second inspection portions T1 and T2 can be measured. It is preferable that a current value of 0.1 to 20 μA can be detected. The current value measured by the second current detection means 5 is sent to the determination means 7.

  The first current detection means 4 is provided mainly for detecting the occurrence of sparks related to the first inspection section (pattern to be inspected), and the second current detection means 5 is provided between the first inspection section and the second inspection section. It is provided to measure the insulation resistance value between. However, it should be understood that the first current detection means 4 and the second current detection means 5 can be combined with one ammeter depending on the performance of the ammeter used.

  The voltage detection means 6 is connected to the first inspection unit T1 and detects the voltage of the first inspection unit T1. The voltage detection means 6 can use a voltmeter that can measure a voltage value related to the first inspection unit T1. The voltage value measured by the voltage detection means 6 is sent to the determination means 7.

  The judging means 7 receives the measured current value from the first current detecting means 4 and the second current detecting means 5 and the measured voltage value from the voltage detecting means 6, respectively, and the circuit board is determined based on these measured values. Judge whether it is a non-defective product. FIG. 3 is a schematic configuration diagram showing the function of the determination means 7. The determination unit 7 includes a spark detection unit 71, a power calculation unit 73, a resistance calculation unit 74, an insulation determination unit 75, and a transmission unit 72.

  The determination performed by the determination unit 7 is based on the current value from the first current detection unit 4 and is compared with a preset reference value, and spark detection is performed to determine whether the product is good or defective according to the comparison result. This is performed by providing the unit 71. As specific comparison methods performed by the spark detection unit 71, for example, the following three methods may be mentioned.

  As a first method, the current value detected by the first current detection means 4 is directly compared with a reference value, and when the detected current value is larger than a predetermined value, it is determined that a spark has occurred.

  For example, in FIG. 4, the change in the current value indicated by the broken line indicates the change in the non-defective circuit board, and the change in the current value indicated by the solid line indicates the change in the defective circuit board to be inspected. A portion exceeding the value A indicates a spark occurrence location. The reference value A when using the first method is not particularly limited, but is set to 0.1 to 1.0 mA.

  When the determination is made by the first method, the power supply means 3 is a variable voltage power supply, and an appropriate circuit is provided to control the increase in the current value at the moment when the voltage is applied so as not to exceed a predetermined value. It is preferable. The determination means 7 is, for example, an A / D conversion circuit (not shown) that sequentially converts measured current values (analog values) from the first current detection means 4 and the second current detection means 5 into digital current data. From the comparison circuit (not shown) that inputs this digital current data as the digital reference value data of the reference value A and outputs a logic high “1” when the measured digital current data exceeds the digital reference value data. Can be configured.

  As a second method, a non-defective circuit board is used in advance to determine a change in current value as a reference current change value B, and a current value and a reference current change value B when a defective circuit board to be inspected is used. This is a method of obtaining a difference and determining as a spark when the difference is not within a preset allowable range.

  For example, in FIG. 5A, a change in current value indicated by a broken line indicates a change in current value (reference current change value B) in a non-defective circuit board, and a change in current value indicated by a solid line indicates a defective circuit board. The change of the electric current value in is shown. FIG. 5B shows the difference between the measured current value and the reference current change value B shown in FIG. 5A, and a location A where a difference exceeding the allowable range C appears indicates a spark occurrence location. The allowable range C when using the second method is not particularly limited, but is set to ± 0.1 to 1.0 mA.

  The determination means 7 includes, for example, an A / D conversion circuit (not shown) that sequentially converts a measured current value (analog value) from a circuit board to be inspected into digital current data, and an appropriate memory (not shown). The digital reference current change value data of the reference current change value B stored in advance), the digital current data and the corresponding digital reference current change value data read from the memory are input, and the difference data is output. And a comparison circuit (not shown) that outputs a logic high “1” when the difference data exceeds the digital permissible range C data at a subsequent stage of the subtraction circuit. Can be configured.

  As a third method, after the voltage is applied to the first inspection unit T1 by the power supply means 3, the change in current at every predetermined time is calculated, and the increase change (the slope of the change in the current changes from the decrease change in the current value). This is a method of determining as a spark when changing from zero to positive.

  For example, in FIG. 6, a change in current value indicated by a broken line indicates a change in a non-defective circuit board, and a change in current value indicated by a solid line indicates a change in a defective circuit board to be inspected. Although the change in the current value of the non-defective product indicated by the broken line continues to decrease to the right, the change in the current value of the defective product indicated by the solid line is observed at a time t1 at which the current value increases, and this point A is a spark occurrence point. It is shown that.

  For example, between time t1 and time t2, the current value of non-defective products continues to decrease (the amount of change with respect to the previous current value is negative), but on the defective circuit board, the current value increases at time t1 (immediately before). It is understood that a spark is generated due to a plus amount of change with respect to the current value. The criterion for using this third method is that the change in the current value should be zero or more in order to detect when the current value increases, or only a sudden change in the current value is detected. It can also be set to a specific positive change value.

  The determination means 7 includes, for example, an A-D conversion circuit (not shown) that sequentially converts a measured current value (analog value) from a circuit board to be inspected into digital current data, and a differential process on the digital current data. And a determination circuit or a comparison circuit (not shown) for determining whether output data of the differentiation circuit is positive or negative or exceeds a predetermined change value. .

  Referring to FIG. 3 again, the determination unit 7 includes a transmission unit 72 that transmits a spark detection signal when the spark detection unit 71 as described above detects a spark. The transmission unit 73 may be able to visually recognize the spark detection on the display unit 8 to be described later, or may be able to recognize it by hearing using an alarm sound or the like.

  The determination unit 7 includes a power calculation unit 73 and calculates the transition of power when a spark occurs from the current value of the first current detection unit 4 and the voltage value of the voltage detection unit 6. The power calculation unit 73 may be provided with an operation unit, and the calculation method may be set in advance by the user, or may be set so as to be automatically calculated when a spark is detected.

  The power calculation unit 73 uses, for example, a first-in first-out memory FIFO (not shown) having an appropriate memory capacity, and the first current detection means 4 obtained via an appropriate AD converter (not shown). The digital current data from and the digital voltage data from the voltage detection means 6 are sequentially accumulated, and means (not shown) for stopping the accumulation of these data within a predetermined time from the occurrence of the spark is provided. Current data and voltage data for a predetermined time can be secured. By providing the power calculation unit 73, the current detection data, the voltage data for a predetermined time immediately after the occurrence of the spark, and the data indicating which wiring the selecting means 2 has selected as the inspection pattern are used. You can know the status of inspection patterns, power over time, spark size, dielectric breakdown, etc.

  The determination unit 7 includes a resistance calculation unit 74, and calculates a resistance value between the first inspection unit T1 and the second inspection unit T2 from the second current detection unit 5 and the voltage detection unit 6. For example, the resistance calculating unit 74 converts the measured current value from the second current detecting unit 5 and the measured voltage value from the voltage detecting unit 6 into a digital current value by using an appropriate AD converter (not shown). Resistance value data can be obtained by converting to a digital voltage value and using a divider circuit (not shown).

  Thus, by providing the resistance calculation part 74 and the insulation determination part 75, insulation resistance calculation can be performed simultaneously with performing a spark detection test | inspection. The determination means 7 determines whether or not the first inspection portion T1 and the second inspection portion T2 are in an insulated state. The determination means 7 can determine using, for example, a comparator (not shown) that inputs resistance value data and reference resistance value data.

  The calculation results of the power calculation unit 73, resistance calculation unit 74, and insulation determination unit 75 are sent to the transmission unit 72 and displayed on the display unit 8.

  The display means 8 includes current values and voltages detected or calculated by the first current detection means 4, the second current detection means 5, the voltage detection means 6, the power calculation unit 73, the resistance calculation unit 74, and the insulation determination unit 75. It is possible to display on the screen the value, resistance value, power value, and the like, the determination result of the presence / absence of spark and the quality of insulation, and the determination result of non-defective or defective circuit board. The display means 8 can also display the numerical values and states as described above in a time series graph and table. This is because, by displaying in time series in this way, the user of the insulation inspection apparatus 1 can visually check the occurrence and size of the spark.

  The above is description of the structure of embodiment of the insulation test | inspection apparatus 1 concerning this invention.

[Insulation inspection method]
FIG. 7 is a flowchart showing an example of the inspection method of the insulation inspection apparatus according to the present invention. A computer program for executing this inspection method is stored in, for example, the storage means 10, and this insulation inspection is executed under the control of the control means 9.

  First, a circuit board to be inspected is installed in the insulation inspection apparatus 1, and a predetermined value for detecting a spark is set (S1). Here, the second method described above will be described as an example of the spark detection method, but the method is not limited to this method. In order to use the second method, the digital reference current change value data of the reference current change value B, which is the current change value by the non-defective product, and the digital allowable range C data for determining the non-defective product are set in the storage means 10. Keep it.

  Inspection of the target circuit board is started.

  First, the selecting means 2 selects a wiring pattern to be the first inspection part (pattern to be inspected) T1 from a plurality of wiring patterns to be inspected, and selects the remaining wiring pattern as the second inspection part T2 (S2). . The first inspection unit is connected to the first and second current detection means via SW2. The patterns constituting the second inspection unit are respectively connected to the power supply means 3 via SW1. At this time, the plurality of wiring patterns forming the second inspection portion T2 are connected in parallel to each other.

  After the circuit board wiring pattern is selected into two groups of the first inspection portion T1 and the second inspection portion T2, a predetermined voltage is applied to the second inspection portion T2 by the power supply means 3 (S3).

  In this state, the first current detection unit 4, the second current detection unit 5 and the voltage detection unit 6 connected to the first inspection unit T1 measure the current and voltage of the first inspection unit T1 respectively (S4). . The current value and voltage value measured by the first current detection unit 4, the second current detection unit 5, and the voltage detection unit 6 are sent to the determination unit 7.

  The spark detection unit 71 of the determination unit 7 calculates the difference data based on the current value measured by the first current detection unit 3 and the predetermined reference value (S5).

  It is determined whether or not the difference data exists in the allowable range C data (S6).

  If the difference data is within the allowable range C data, it is determined that there is no spark (no spark detected) (S7). On the other hand, if the difference data is outside the allowable range C data, it is determined that a spark has been detected. (S8).

  If it is determined in step S8 that there is a spark, the circuit board is determined as a defective product (S10). In the case of occurrence of a spark, it is displayed on the display means 8 by the transmission unit 72.

  If no spark is detected, the resistance calculation unit 74 of the determination unit 7 uses the current value and the voltage value from the second current detection unit 5 and the voltage detection unit 6 to perform the first inspection unit T1 and the second inspection unit. The resistance between the parts T2 is calculated. In addition, in this flowchart, although the test | inspection process which performs an insulation test for every completion | finish of a spark test | inspection is shown, an insulation test may be performed before a spark test | inspection, and the test process performed simultaneously with a spark test and an insulation test | inspection .

  The resistance value data calculated by the resistance calculation unit 74 is sent to the insulation determination unit 75. The insulation determination unit 75 compares the calculated resistance value data with preset reference resistance value data to determine the insulation state (S9). If the calculated resistance value data is greater than or equal to the reference resistance value data, it is determined that the circuit board is in an insulated state, and the circuit board is determined to be a non-defective product (S11), and if the calculated resistance value data is less than the reference resistance value data. It is determined that the circuit board is not in an insulated state (S12), and the circuit board is determined as a defective product (S10).

  When it is determined as a defective product, it is displayed on the display means 8 by the transmission unit 72 as in the case of detecting a spark.

  When both the spark inspection and the insulation inspection are completed, the first inspection section T1 and the second inspection section T2 are selected by the selection means 2, and the inspection is repeated until all the wiring patterns are inspected as the first inspection section T1. Is performed (S13).

  When the display means 8 notifies that the product is defective due to the occurrence of a spark, the current value data obtained from the first current detection means 4 and the voltage detection means 6 are obtained by the user or automatically. From the obtained voltage value data, the power calculation unit 73 of the determination means 7 calculates the power value data. At this time, the calculated power value data is displayed on the display means 8.

  For this reason, the user of this insulation test | inspection apparatus 1 can confirm visually the magnitude | size etc. of a spark immediately at the time of a spark generation. The above is the description of the embodiment of the insulation inspection method according to the present invention.

[Advantages and Effects of Insulation Inspection Apparatus and Insulation Inspection Method According to this Embodiment]

(1) In the conventional insulation inspection apparatus, for example, because of the circuit element for forming the apparatus, a voltage drop cannot be detected due to a sudden change in the applied voltage. It was necessary to set a sufficiently long inspection time for starting up to the voltage value. For this reason, as a result, the inspection time required to perform the spark detection is increased.

  According to the insulation inspection apparatus and the insulation inspection method of this embodiment, when a current value is larger than a predetermined value, a spark is generated and it is determined that the product is defective, so that it can be determined efficiently in a shorter time. To.

  Furthermore, according to the insulation inspection apparatus and the insulation inspection method of the present embodiment, since the insulation inspection apparatus has the second current detection means having a different range from the first current detection means, the first current detection means generates a spark. It is possible to detect the leakage current by the second current detection means. For this reason, the insulation inspection and the spark detection inspection can be performed at the same time, and the inspection time can be further shortened.

(2) In the conventional insulation inspection device, for example, with respect to the spark detection method, only the spark detection is performed by observing the transition of the voltage change and detecting the voltage drop, and the situation and the size of the generated spark are analyzed. I couldn't.

  According to the insulation inspection apparatus and the insulation inspection method of the present embodiment, since the insulation inspection apparatus includes the current detection unit, the voltage detection unit, and the display unit, the state of changes in current and voltage when a spark is detected is displayed on the display unit. In addition to being able to display, it is also possible to calculate and display the magnitude (electric power) of the spark. For this reason, it is possible to visually indicate the state of the spark to the user, and to easily grasp the state of the spark.

(3) Particularly in recent years, circuit boards have become more complicated, and wiring patterns have become more complicated. As the wiring pattern becomes more complicated, the area (the size of the net) of the wiring pattern itself has increased. For this reason, when a voltage is applied to the wiring pattern, the wiring pattern itself accumulates charges, and sparks are easily generated. Furthermore, because of the miniaturization of the circuit board itself, sparks due to foreign substances present in the circuit board itself have been easily generated.

  According to the insulation inspection apparatus and the insulation inspection method of the present embodiment, even if the wiring pattern is complicated, or even if the wiring pattern itself is charged, the first current detection means is not affected by this, The current only between the wiring patterns is measured.

  Further, according to the insulation inspection apparatus and the insulation inspection method of the present embodiment, the second inspection unit is formed by connecting all the plurality of wiring patterns other than the wiring pattern of the first inspection unit in parallel. Prevents sparks from occurring between the two inspection units. For this reason, it is possible to prevent the occurrence of sparks in the wiring pattern other than the inspection target.

As described above, the insulation inspection apparatus and the insulation inspection method according to the present embodiment are an apparatus and method for performing an insulation inspection of a circuit board on which a plurality of wiring patterns are formed. The spark can be detected more accurately and the state of the spark can be accurately detected, and the inspection time can be shortened as compared with the prior art.
[Alternative examples]
As mentioned above, although embodiment of the insulation test | inspection apparatus and insulation test | inspection method which concern on this invention was described, this invention is not restrained by this embodiment. It should be understood that additions, deletions, modifications, and the like that can be easily made by those skilled in the art are included in the present invention.

  (1) As the pattern P formed on the circuit board 10, five types of wiring patterns are illustrated. However, the wiring pattern P is not limited to these five types, and the type, number, position, size, shape, and the like of the wiring pattern are not limited to the illustrated wiring pattern. The circuit board 10 is also a multilayer board in which a wiring pattern spreads in a plurality of layers via via holes (via holes).

  (2) In the selection means 9, the determination means 7, the storage means 10 and the like of the control means 9, the respective constituent circuits are illustrated, but the invention is not limited to these. Other circuits that can achieve the purpose of the individual means can be used.

  (3) The pattern P formed on the circuit board 10 is used as a single first inspection part (inspection pattern) and a second inspection part other than the first inspection part (all wiring patterns other than the inspection pattern)). explained. However, the insulation inspection apparatus is an inspection performed between a pattern to be inspected and a pattern adjacent to the pattern that causes insulation failure. To the extent that this purpose can be achieved, “all wiring patterns other than the pattern to be inspected” should be interpreted elastically.

  That is, although the second inspection part is set to “all wiring patterns other than the pattern to be inspected”, even if a pattern that is not likely to cause an insulation failure adjacent to the pattern to be inspected is excluded from the second inspection part. Please be aware that this is the subject of the invention. For example, when the wiring of the circuit board 10 is divided into blocks and the patterns are separated from each other and there is no risk of insulation failure, the first inspection unit and the second inspection are performed in a single block. Parts are defined.

  Similarly, when performing an insulation inspection, except for a pattern that is not likely to approach an adjacent pattern, these patterns are not the targets of the first inspection unit and the second inspection unit.

  Further, in order to escape from the technical scope of the present invention, even if some patterns are removed from the second inspection part without any purpose or effect, such an implementation is an object of the present invention.

  (4) Further, the object of the present invention includes a computer program for causing the computer 9 to execute the insulation inspection method and a recording medium on which the computer program is recorded.

  (5) At each inspection stage, a predetermined voltage is applied from the power supply means 3 to the second inspection portion T2. Therefore, in each inspection stage, a step may be provided in which the charge charged in the second inspection part T2 is discharged.

  (6) The inspection performed by the insulation inspection apparatus 1 selects the pattern P of the circuit board 10 as the first inspection portion T1 and the second inspection portion T2 according to a predetermined rule, and applies a predetermined voltage to the second inspection portion T2. Then, the insulation inspection is performed by detecting the current flowing through the first inspection portion T1 in a state where a predetermined potential difference is generated between the first inspection portion T1 and the second inspection portion T2. Here, the first inspection part is composed of a single wiring pattern to be selected, and the second inspection part T2 is composed of all wiring patterns other than the first inspection part T1. The inspection is completed when each wiring pattern is sequentially selected as the first inspection unit, insulation inspection is performed with the second inspection unit each time, and all wiring patterns are selected as the first inspection unit and inspected. To do.

  For this reason, in order to detect the leakage current flowing through the first inspection portion T1 composed of a single wiring pattern, in FIGS. 1, 2A and 2B, the single wiring pattern T1 is connected between the ground (earth) location. The first current detection means 4 and the second current detection means 5 are connected.

  However, the connection location of the first current detection means 4 and the second current detection means 5 is not limited to this. The leakage current flowing through the first inspection portion T1 formed of a single wiring pattern occurs when a predetermined voltage is applied from the power supply means 3 to the second inspection portion T2 and the first inspection portion T1 has an insulation failure. Leakage current. When there is no insulation failure in the first inspection unit T1, no current flows through the first inspection unit T1 even if a predetermined voltage is applied from the power supply means 3 to the second inspection unit T2.

  Therefore, one or both of the first current detection means 4 and the second current detection means 5 are connected between the power supply means 3 and the second inspection part T2, and the current flowing through the second inspection part T2 is detected. Thus, it is possible to detect the presence or absence of insulation failure in the first inspection portion T1. That is, either one or both of the first current detection means 4 and the second current detection means 5 are arranged between the power supply means 3 and the branch point of each second inspection unit T2 in FIGS. 1, 2A and 2B. You may connect. Also in this case, the current data detected by the first current detection means 4 and the second current detection means 5 is sent to the control means 9.

  The technical scope of the present invention is defined by the description of the appended claims.

FIG. 1 is a schematic configuration diagram of an example of an insulation inspection apparatus according to the present invention. FIG. 2A is a diagram showing an example of a combination of the first inspection unit and the second inspection unit by the selection means of FIG. 1, and the uppermost wiring pattern P1 in the switch group SWs is selected as the first inspection unit T1. The wiring patterns P2 to P5 are selected as the second inspection part T2. FIG. 2A is a diagram showing an example of the combination of the first inspection unit and the second inspection unit by the selection means of FIG. 1, where the wiring pattern P4 is selected as the first inspection unit T1, and the wiring patterns P1 to P3, P5 are selected. A state in which the second inspection unit T2 is selected is shown. FIG. 3 is a schematic configuration diagram illustrating the function of the determination unit of FIG. FIG. 4 is a graph showing changes in current values in non-defective and defective circuit boards. Here, the two-dot broken line indicates the reference value A. FIG. 5A is a graph showing changes in current values in non-defective and defective circuit boards. FIG. 5B shows the difference between the current values shown in FIG. 5A. Here, the two dashed lines indicate the allowable range. FIG. 6 is a graph showing changes in current values in non-defective and defective circuit boards. Here, the state of change at times t1 and t2 is shown. FIG. 7 is a flowchart showing an inspection method executed by the insulation inspection apparatus of FIG.

Explanation of symbols

1: insulation inspection device 2: selection means 3: power supply means 4: first current detection means 5: second current detection means 6: voltage detection means 7: determination means 8: display means 9: Control means 10: Storage means P: Wiring pattern SW: Switch SWs: Switch group T1: First inspection part T2: Second inspection part CP: Contact pin

Claims (3)

  An insulation inspection apparatus for performing an insulation inspection of a circuit board on which a plurality of wiring patterns are formed,
  One wiring pattern to be inspected is selected from the plurality of wiring patterns as a first inspection unit, and all the wiring patterns to be inspected other than the first inspection unit are connected in parallel as a second inspection unit. A selection means to select;
  In order to set a predetermined potential difference between the first inspection unit and the second inspection unit, a power supply means connected to the second inspection unit and applying a voltage to the second inspection unit;
  Current detection means connected in series to the second inspection units connected in parallel;
  A determination that the current detection unit detects a current value flowing between the first inspection unit and the second inspection unit with a predetermined reference value and determines the circuit board as a non-defective product or a defective product based on the comparison result. And an insulation inspection apparatus.   An insulation inspection apparatus method for performing an insulation inspection of a circuit board on which a plurality of wiring patterns are formed,
  One wiring pattern to be inspected is selected from the plurality of wiring patterns as a first inspection unit, and all the wiring patterns to be inspected other than the first inspection unit are connected in parallel as a second inspection unit. A step to elect,
  In order to set a predetermined potential difference between the first inspection unit and the second inspection unit, the step of being connected to the second inspection unit and applying a voltage to the second inspection unit;
  Connecting the current detection means in series to the second inspection units connected in parallel;
  The step of comparing the current value flowing between the first inspection unit and the second inspection unit detected by the current detection unit with a predetermined reference value and determining the circuit board as a non-defective product or a defective product based on the comparison result And an insulation inspection method.   A computer that performs insulation inspection of circuit boards on which multiple wiring patterns are formed.
  One wiring pattern to be inspected is selected from the plurality of wiring patterns as a first inspection unit, and all the wiring patterns to be inspected other than the first inspection unit are connected in parallel as a second inspection unit. A step to elect,
  In order to set a predetermined potential difference between the first inspection unit and the second inspection unit, the step of being connected to the second inspection unit and applying a voltage to the second inspection unit;
  Connecting the current detection means in series to the second inspection units connected in parallel;
  The step of comparing the current value flowing between the first inspection unit and the second inspection unit detected by the current detection unit with a predetermined reference value and determining the circuit board as a non-defective product or a defective product based on the comparison result And a computer-readable recording medium having recorded thereon a circuit board insulation inspection method program.

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