TW200307139A - Apparatus and method for examining insulation of circuit board - Google Patents

Abstract

A kind of insulation examining apparatus is disclosed in the present invention, which adds DC voltage in between the wirings of circuit board to conduct the examination of insulation characteristic of the wirings, capable of truly preventing the circuit board having spark occurrence during insulation examination from being mixed into the circuit boards judged as the excellent products. The variable voltage source 2 of the insulation examining apparatus passes through the switch circuit 4; and a voltage meter 3 is used to measure the voltage added to the wirings Pi at the determined moment after adding a determined DC voltage to the determined wirings Pi (i=1, 2, 3, 4, 5). In addition, a current meter 5 is used to measure the current I flowing between the wirings. A control apparatus 6 calculates the insulation resistance value based on these two measured values so as to determine if the circuit board passes or fails according to the insulation resistance value. However, once there is spark generated in between the wirings caused by the added voltage, the spark detection circuit 7 can be used to check whether the spark is occurred or not. Thus, the circuit board having the occurrence of spark can be directly judged as the unqualified product by the control apparatus 6 without using the insulation resistance value to judge whether the circuit board is qualified or not.

Description

200307139

FIELD OF THE INVENTION The present invention relates to a liquid crystal and plasma method of a thunder pole cup, which is printed with thunder, and shows crying. In the past years, the color edge inspection device and the insulation inspection party have used the insulation inspection equipment with multiple wirings to connect to each wiring: "Li Mianxian County" only "Men + +, /, other wiring Whether the insulation is good (whether Baoxun has sufficient insulation), whether the board is good. Broken wood detection circuit base Fig. 4 is a schematic diagram of the basic structure of a conventional insulation inspection device. The insulation device 1 includes: a voltage for applying a high voltage v between the apricot contacts (e.g., the distribution of an elephant, ιοί of P2 > ^ „Λ, π ρ Τη ^ ^ m, connected to the above-mentioned wiring P i ; Gate 2 of the field voltage voltmeter P1 DO ^ ^ ^ on the switch 1 0 3, for measuring the wiring, between the 'motorized current' ammeter 104, and based on the voltmeter and ammeter The control device 10 which calculates the resistance value R (v / n and the resistance value R to determine whether the insulation is good or not) is outputted from the 104 output. A ^ Here, the edge check I is set to 1 and once The control device 105 turns on the switch 103, and the output voltage of the variable voltage source 101 is applied to the wiring ", P2, the wiring value measured by the voltmeter 102, and the voltage value between the wiring and the current meter 104 The measured current value flowing between the wirings P1 and p2 is input to the control device 105. The control device 105 applies a wheel-out voltage of the variable voltage source 101 between the wirings p1 and p2, and then determines Time basis

200307139 V. Description of the invention (2) The detected voltage value V and current value] Calculate the wiring resistance value (insulation resistance value) R = V / I, the electrical of the door If it is not more than the predetermined threshold value Ref set in advance? No u ^ H ^ mKel, to determine the circuit board. That is, if the prepared insulation resistance value R is above the threshold value Ref =, the device 105 judges that the insulation condition between the wirings P1 and P2 is good, and when the insulation resistance value R does not reach the threshold value Ref, It is determined that the insulation condition between the wirings P1 and P2 is defective. … 105 / After the output voltage of the variable voltage source 丨 〇1 is applied between wiring p1 and P2, it is not immediately judged whether the insulation is good or not, because, as shown in Figure 5, the wiring p 丨The voltage v has just been applied between P2 and P2, and the voltage between the wirings is still in an unstable state (the area where the voltage rises in FIG. 5 (a) ^). Also, there is an instant between wirings p 丨 and p2. A large transient current flows. Therefore, it is necessary to judge whether the insulation condition is good after the voltage between the wirings P1 and P2 is stabilized at the applied voltage V and the current is also stable at a predetermined time 12. SUMMARY OF THE INVENTION However, since a high-voltage DC voltage is applied between the wirings P 1 and P 2 to be inspected, a spark will occur between the wirings after the voltage is applied until a predetermined time 12 elapses. As a result, there is a problem that the insulation resistance value between the wirings P1 and P2 changes. For example, in FIG. 5, if a spark occurs at time 11 'as shown by the dotted line A, the voltage between the wirings will drop sharply in an instant'

2014-5547-PF (Nl) .ptd Page 6 200307139 V. Description of the invention (3) Rising again, meanwhile, as shown by the dotted line B, a large current flows at an instant, and the insulation resistance value R is The moment the spark occurs almost becomes 0Q, and then it gradually increases. ° After the spark occurs, 'because the voltage between the wirings increases toward the applied voltage v, the current flowing between the wirings P1 and P2 decreases, so , The insulation resistance value R between the wiring PI and P2 will increase. However, as the insulation electrical limit R changes due to sparks, as shown by the dotted lines C and D, the increased waveform is also in an unstable state. In this way, as shown by the dashed line c, at the inspection time 12 ', if the insulation resistance value R is equal to or higher than the product grade value R ef, the circuit board can be judged to be a good product. As shown by the dashed line D, the insulation resistance value r is greater than the critical value Ref If it is small, the circuit board is judged to be defective. ^ Because the insulation resistance value R due to sparks is smaller than the critical value Re f, the circuit board can be judged to be a defective product at the detection time t2 even with a conventional insulation inspection method, so this situation does not exist What a special question. However, in the case where the insulation resistance value R is above the critical value Re as shown by the dotted line C, the circuit board is judged as a good product at the detection time 12 according to a conventional insulation inspection method, so Among circuit boards judged to be excellent products, circuit boards whose insulation resistance value R changes due to sparks during the insulation inspection, and circuit boards which are not ', x' are mixed together. Because of the spark resistance and the edge resistance, the circuit board where R changes will be more + due to the occurrence of sparks, which will cause some f damage. Therefore, compared with the circuit board that does not generate sparks, the reliability of the product will be reduced. , Then it will appear on this = installing circuit parts or checking the installed components; =

2014-5547-PF (Nl) ptd

200307139 V. Description of the invention (4) ---- The problem of circuit-based problems arises due to thermal, electrical, and mechanical fatigue. ~ A circuit board judged to be a good product by an insulation inspection device, and then it becomes a defective product ', which will significantly reduce the reliability of the insulation inspection device. Therefore, it is necessary to try to prevent the circuit boards whose insulation resistance value R is changed due to the occurrence of sparks during the insulation inspection, and the circuit boards which are not in this case mixed together, which may be judged as a good circuit board. occur. An object of the present invention is to provide an insulation inspection device and an insulation inspection method for a circuit board, which can ensure that a circuit substrate on which a spark has occurred is distinguished as a defective product. Means for Solving the Problem The insulation inspection device for a circuit board of the present invention applies a predetermined DC voltage between wirings, and a predetermined time when the voltage between the wirings is stable, based on the voltage value and the voltage caused by the applied voltage. The current value flowing between the wirings is used to calculate the resistance value between the wirings, and then the circuit board is judged to be good based on the resistance value. It is characterized by including a spark detection device that detects The spark generated between the wirings caused by the voltage; and the judging device, once the spark detection is detected by the spark detecting device, judges that the circuit board is defective. According to another aspect of the present invention, in the method for inspecting the insulation of a circuit board of the present invention, a predetermined DC voltage is applied between wirings, and a predetermined time when the voltage between the wirings is stable, according to the voltage value and the voltage applied by ^^ ii im 2014-5547-PF (Nl) ptd ^ 'chu〇 百'-200307139 V. Description of the invention (5) = Description: The value of the current flowing between f is calculated. It is characterized by: Spark thorns that occur between the wires until the voltage is stable due to the applied voltage = anvil strips and once a spark is detected, the circuit is judged whether the step board is good based on the resistance value The substrate is defective. According to the above invention, a predetermined DC voltage is applied between the wirings, and when the voltage between the wirings is stable at a predetermined time, the voltage value V between 2 and the current flowing between the wirings is detected. value! , And then calculate the insulation resistance value R = v / j between this wiring based on the 检测 k * solid detection value. By comparing this insulation resistance value R with a preset threshold value Ref, then = whether the circuit board is good or not Make judgments. That is, if the insulation resistance is above the threshold value Ref, the circuit board is judged to be a good product, and if the insulation resistance value R is smaller than the threshold value Ref, the circuit board is judged to be a defective product.

In addition, during the insulation inspection of the circuit board based on the above-mentioned insulation resistance value, once a predetermined DC voltage is applied between the wirings and the voltage between the lines is stable at a predetermined time, once it occurs between the lines After a spark is generated, the occurrence of the spark can be detected without judging whether the circuit board is good or not based on the resistance value, and the electric substrate on which the spark has occurred is directly judged as a defective product. Accordingly, it is possible to reliably prevent the occurrence of sparks in the circuit board which is judged to be a good product through the insulation inspection.

200307139 V. Description of the invention (6) Moreover, the application of a predetermined surface potential between the lines of the present invention to apply a predetermined DC voltage plus the above-mentioned DC voltage which is smaller than a large-area spark that occurs and is also caused by The time required for stabilization is short. Therefore, the time can be judged well, and the spark is measured on the surface when the wiring with a large spark specific area is required. Moreover, the present invention includes an operating device for describing a predetermined time. And at any time, based on this feature, you can make a good judgment on the time to monitor whether the reliability has been improved. Because the shortened circuit is DC and DC, yes, so the wire is used as wiring, etc. The root causes the voltage to be reduced when the substrate pressure is large and the accumulated substrate is small. According to the above short inspection, the area of the spark and the potential of the damage current voltage is large. The wiring is used as an insulation inspection device. In the above configuration, the wiring with a small area can also be made as this. When the high potential is applied to the spark current flowing when it occurs, it is possible to reduce the resistance value of the wiring at the voltage between the wirings from zero to high to determine the circuit board time. Voltage change, wiring with a small area detects the fire based on the change in voltage. The circuit board's insulation inspection device can also accurately check the circuit board. It can also change the circuit board ’s goodness. Good established: set arbitrarily. The device is used to delay the occurrence of sparks on the circuit board, because it can be longer. And the other side, the product (circuit board) has been inspected, and the household is broken at a fixed time d. It can be known that the effect of the inspection is 2014.5547-PF (Nl) .ptd Page 10, 200307139 V. Description of the invention ( 7) rate. Therefore, it is necessary to perform a judgment on the balance of the results, and the present detection device, and the judgment device. With a predetermined cycle, the signal and the spark of the substrate insulation are accurately and accurately generated. Moreover, the process control device and control are no longer checked. In addition, a spark is detected. According to the occurrence of this special spark, many circuit bases are set to operate at fixed timings. The circuit of the invention can be freely set to include the application of a voltage to the signal. Method,. Based on these effective detection. The invented circuit set ends the sign as soon as the circuit base is inspected later, because the board can be omitted and the inspection device can be omitted, which can be combined with the above-mentioned sampling method when the substrate is lowered. The spark inspection process of the substrate, the inspection time of the board's insulation circuit can be changed after the inspection of the product, the insulation inspection, the above-mentioned rules to determine the sampling of flower detection, and the reliability of the circuit board can be installed when applied. The voltage-increasing spark generator can keep the device set. In addition, if the voltage is lowered, it is good to check the fire. The spark generated by the above-mentioned spark voltage test includes pressing the sum, the above, the above-mentioned electric drop to detect the occurrence of flowers. Instead, the edge inspection method for the circuit board is ended, and the inspection process is performed once the board is inspected. There is an inspection process for the circuit board being inspected, so in particular, it has a better inspection efficiency. Embodiment 1 FIG. 1 is a schematic structural view of an embodiment of an insulation inspection device according to the present invention.

200307139

Insulation inspection m. For each of the self-contained wires P1 to P5, which is not shown, is used in conventional techniques to determine whether the insulation status with other wiring is good. When all wirings P1 to P5 and other wirings are confirmed, When the insulation conditions between the two are good, it is possible to electrify: the substrate is excellent A ', and when there is only one part of the watch that has a poor insulation condition, the circuit substrate is judged to be defective. In addition, in order to solve the problem caused by the occurrence of the above-mentioned sparks, a structure capable of detecting that a spark has occurred between the wirings during the insulation inspection and determining that the circuit board is a defective product when a spark is detected . The insulation inspection device 1 includes a variable voltage source 2, a voltmeter 3, a switch circuit 4 connected to wirings P1 to p5 provided on a circuit board (not shown), an ammeter 5, a control device 6, and a spark detection circuit 7. , D / A converter 8, A / D converter 9 and 10. Further, the D / A converter 8 converts a control signal (numerical signal for controlling the output voltage) output from the control device 6 to the variable voltage source 2 into an analog signal. The A / D converter 9 converts a voltage detection signal (analog signal) input from the voltmeter 3 to the control device 6 into a numerical signal, and the A / D converter 1 is a current input from the ammeter 5 to the control device 6 The detection signal (analog 5 tiger) is converted into a numerical signal. The inspection apparatus 1 is basically constituted by adding a spark detection circuit 7 to the conventional insulation inspection apparatus 100 shown in Fig. 4. That is, the variable voltage source 21, the voltmeter 3, the switch circuit 4, the ammeter 5, and the control device 6 of the insulation inspection device 1 correspond to the variable voltage source 101, the voltmeter 102, and the switch of the insulation inspection device 100, respectively. Circuit 103, ammeter 104 and control

2014-5547-PF (Nl) ptd page 12 200307139 & Invention Description (9) Manufacturing device 1 0 5, but from 1 Although Figure 4: The function is basically the same. . + The conventional insulation inspection device 丨 χ ^ line is used as an example to detect the eyebrows 1 0 〇, and the principle of 2 pairs of columns is explained, and the right circuit board is formed on the real circuit board. The insulation between the wirings being inspected is the technical principle of this invention. The same principle is used to check the embodiments of the invention. T is also set to 5 for the well-known, as indicated by ^ 下 疋'、 / ， 了 " Explain that the inspection of the original Wangli, combining the number of lines of the I line to carry out p' Lyou wiring p 1 ~ P 5 also select the appropriate wiring entry can also detail this inspection principle. … Times, for most of the wiring quilts: ί 2. P2 is a linear wiring with contacts at both ends. W is a ϋ wiring with contacts, and _ and P 5 are 4 tops. The small ones are: Ten sons open 7 Wiring. The large area of each area of the wiring Pb P5 PI = P2 < P3 < P4 = P5 The content of this area will be described in detail later.

And 'I ’m different based on the number of wirings. The switching circuit 103 in the inspection device 100 is composed of 1 switch. ^ ^ ^ ^ ^ The structure of the switching circuit 4 is changed to / In the embodiment, “all, q, μ, +, and admittance are called the local switching group switch SWi (i = i, 2, ... 5), and the above-mentioned switching switches are connected by each matched, variable voltage source 2 ^, 0 r of the switches TiU, (, 2, ... 5) are composed of 1 ~ 1,2, ... 5) and Ml (1 = 1,2, ... 5) connected to the ammeter 5. Variable voltage source 2 is used to apply the existing voltage (hereinafter referred to as the test voltage) between the wire * ^ Φ / ¾ r, ν nr ^ ^. And the wiring of the door inspection object,

; D / A by D / A converter 8

200307139 V. Description of the Invention (ίο) Conversion: 5 sets of control signals whose output voltage can be controlled. I ΐ of the door is used to measure high-potential wiring and low-potential wiring. "The pressure gauge 3 measures the electrical repeat information. It is input to the control device 6 after" D conversion and 9 conversion "and" A / D conversion. " 5) As the wiring to be inspected, the wiring of each wiring: ~ circuit 4, according to a preset combination, can be the wiring Pi (1 = 1, 2, ... P i and the insulation inspection device 1 side) as described above ^千 彳 查; / i __: the positive switch T1, and the negative switch Μι on the L Λ J flow meter 5. Similarly, the transfer switch = ^ pin 2 "5 connected to the positive pole of the variable power supply ~ And the negative switches M2 to M5 that connect the wiring P2 to P5 to the ammeter 5. The switches n to T5, M2 to the intestine of the switching circuit 4, and the control device 6 control their switching. 疋 由 = The ammeter 5 is used to measure the exchange of 'crying 10: · 1' between the voltage-applied wiring. After the current value measured by the ammeter 5 is A / D converted to 10 and A / D conversion is performed, It is input into the control device 6. "The cremation inspection circuit 7 'is used to detect what happens due to the application of voltage: one is as shown in Fig. 5 (a). 'Once the cremation is caused by the application of the DC voltage v, the output voltage of the variable voltage source 2 will suddenly decrease, so if the voltage change is detected, it can be detected whether the spark passes the inspection circuit 7, for example, by sampling Hold the circuit and compare the sparks: the structure is that the voltage seven can be sampled at a predetermined cycle; sampling is performed and the previous voltage signal and the current voltage signal ^ = car parent, once a drop in the voltage waveform is detected (this time the voltage Compared with the last time

200307139 V. Description of the invention (π) When the pressure is small), the signal of spark occurrence is output. This spark detection signal is input to the control device 6. The control device 6 includes a switching control device 61 that performs 0N / 0FF (switching) switching of each of the switches T1 to T5 and M5 of the switching circuit 4, a voltage value detected by the voltmeter 3 and a voltage detected by the ammeter 5. A value calculation device 62 for calculating the insulation resistance value R, and a determination device 63 for determining whether the insulation status is good or not based on the resistance value R calculated by the resistance value calculation device 62 and a signal output from the spark detection circuit 7. In this embodiment, as shown in Table 1, the switching control device 61 performs switching control of 0 N / 0 F F on each of the switches T1 to T5 and M1 to M5. Table 1

SW1 SW2 SW3 SW4 SW5 T1 Ml T2 M2 T3 M3 T4 M4 T5 M5 1st ON — — ON — ON — ON 2nd — — ON — — ON — ON — ON 3rd — — — — — — — One ON — ON 4th — — — — — — ON — — ON That is, in order to check the insulation status of wiring P1 and other wirings P2 to P5, all switches M2 to M5 are turned on (0N) and the wiring is turned on. After P2 to P5 are at a low potential, turn on the switch T1 to make the wiring P1 at a high potential (the first inspection). Thus, in this embodiment, the insulation inspection between the wirings P1 and P2, P1 and P3, P1 and P4, and P1 and P5 can be performed simultaneously. this is

2014-5547-PF (Nl) ptd Page 15 200307139 V. Description of the invention (12) -------- Because the insulation inspection device of this embodiment cannot detect which wiring it is, even Sparks have occurred, but the circuit board can be distinguished as a defective product as long as a spark is detected, so it is sufficient if a spark is detected between any wiring. In this way, since the insulation inspection between the wiring P1 and the other wirings P2 to P5 can be performed at the same time, 'for the insulation inspection of the wiring P1 and the other wirings p2 to P5, use! This inspection can complete the five inspections required for the insulation inspection between the individual wirings, which can greatly reduce the time required for the insulation inspection. The same applies to the second and subsequent inspections. Secondly, in order to check the insulation of the wiring P2 and other wirings p3 to p5, after all the switches M3 to M5 are turned on and the wirings p3 to P5 are at a low potential, the switch T 2 is turned on to make the wiring p 2 at High potential (second check). Here, the switch M1 is not turned on because the wiring PI and P2 have been subjected to an insulation inspection during the} th inspection. Next, in order to check the insulation status of wiring P3 and other wirings P4 and p5, 'while switches M4 and M5 are turned on, and wirings P4 and P5 are at a low potential, while turning on switch T3, wiring P3 is at a high level. Potential (3rd check). Then, in order to check the insulation of the wiring P4 and wiring p5, while the switch M5 is turned on so that the wiring P5 is at a low potential, the switch is turned on so that the wire P4 is at a high potential (the fourth inspection). To control the 0N / 0FF (on and off) of each switch mentioned above, the following points are also considered. w Since the wirings P1 to P5 each have an electrostatic capacitance, at the time when the spark is about to start, the positive voltage corresponding to the voltage VSps (see Figure 5) at the start of the spark.

2014-5547-PF (Nl) .ptd 'Page' * --- 200307139 V. Description of the invention (13): Wide charge, wiring from electricity to high potential (distribution connected to the positive contact of electricity source 2: Γ In the case where the area / capacitance is proportional to the area of the wiring, the wiring is used in the case of high potential, and the wiring of the area). Because when the wiring of the product 7 is large, the wiring of the large i is used as the high spark current when the wiring is high, the wire and so on must be beared, and when the wiring with a larger area is used as the high potential Case: Compared with :, brother, and bit, you can judge the time in advance, J 2 wiring as high power, and G voltage due to sparks ^ short inspection time. j 差) 'A large-area wiring is smaller than a small-area wiring. (: Vsps_Ning detects sparks based on voltage changes, -Λ j, s. Therefore, since it is a high potential, it is difficult to fire M' If the area is Therefore, in this embodiment, “Skin 2” is tested. When performing the insulation inspection as described above, the above-mentioned conditions are used, and further, the wiring with a large area is regarded as a low potential. The wiring with a small area is used as High potential. For example, in the first inspection in Table 1, the other wirings P2 ~ ρ5 with a large area will have wiring P1 with a smaller area than wiring? 1. Turn on the positive pole switch to become low. The potential will be taken as the high potential. Page 17 2014.5547-PF (Nl) .ptd 200307139 V. Description of the invention (14)-The resistance value is set to 6 2 'The voltage v and ammeter measured according to voltmeter 3 5 Calculate the resistance value R (= v / I) by measuring the measured current I. The judging device 63 has a timer 63a, and the timer 63a is used to count from the time t0 when the test voltage is applied between the wirings. The time elapsed passes through the predetermined time when the voltage of the wiring is stable. (Refer to FIG. 5) The calculated insulation resistance value r is compared with a preset threshold value 讦 smaller to determine whether the insulation state is good. That is, when the calculated j resistance value R is above the threshold value 讦When the

The edge condition is good ', and if the temple is below the critical value Rref, it is judged that the insulation state between wirings is defective. The judging device 63 determines whether the insulation state is good based on the above-mentioned insulation resistance value! ^ Once a fire detection number from the spark detection circuit 7 is input, it is no longer necessary to determine whether the insulation state is based on the insulation resistance value 1 ^. Good, but the circuit board is directly judged as a defective product. This is because it is considered that the circuit board that has sparked during the insulation inspection may be damaged by the c-worker. Therefore, the reliability of the insulation characteristics of the circuit board is reduced, and the sample can prevent such trust. Unreliable electricity = soil board mixed into circuit board judged to be good by insulation inspection

From the process shown in the nursery 2

As shown in Figure 2, the test voltage applied to the wiring contact of the inspection object (step # 1) is based on the table! The setting conditions of% SW and SW5 during the i-th inspection in the

200307139

2 .... 5), the positive switch D i (i = 1, 9 R λ # 3), turn on in order to check js μ π ^ 2, ... 5) in sequence (step # 2, by the timing second line) When the test voltage is applied at the same time, when the leaves of the field τ 牙 w bda are started (step # 4). (Ϊΐ # 5ΓΛ count to a predetermined count value (count value corresponding to time t2 step # 5) 'The voltage is measured Value ¥ sum = the voltage value V and the current 丨 _ 瞀 + ^ # (vstep # 6), and then according to the determination of the fire resistance I open the resistance value R (step # 7). Then, YES), then judge the Is there any cremation in the circuit beauty (the circuit board in step # 8 is defective (step # 9). Φ Ye Zeng = no spark has occurred (No in step # 8), then determine whether the resistance value R of ft f is critical If the value Rref is greater than (step, bar, and taste resistance value R is greater than the critical value Rref (YES in step # ι〇)), it is determined that the insulation status of the wiring is good (step # ιι), such as below the critical value Rref ( Step # 10 muscle), the defective product is judged (Step # 9). Then, the fourth time (between wiring p 4 and p 5) of Table 1 is checked, and if from step # 1 to step # 1 1 Processing is not over Step # 12 ⑽), then return to Step # 1 'The above-mentioned process is repeatedly performed for the remaining number of inspections, and if all the inspections shown in Table 1 are completed, the above-mentioned process is ended (YES in Step # 12)' The circuit board is judged to be a good product (step # 1 3), and the entire insulation inspection is terminated. In this way, the resistance value R can be calculated at a predetermined time when the voltage of the wiring is stable, and the resistance value R can be compared by The size of the threshold value is used to judge whether the insulation of the wiring is good, and the sparks occurring between the wirings can be detected before the above judgment is made.

200307139 V. Description of the invention (16) When the spark is sparked, the circuit beauty is directly judged because the board is judged to be excellent p σ: the board is defective, so it can prevent the occurrence of sparks in the circuit board ... due to the insulation inspection t and This is not the case with an electrically-generated circuit board. The reliability of the circuit board caused by the tower substrate is sometimes reduced, and the counter value is used to determine whether the spark break occurs. "1; a predetermined time in a fixed state, to judge that the circuit board is defective at the time of„. After the imaginary step 1ΓΛ 'is shown in FIG. 3', after completing the steps with the above embodiment, it is determined whether a spark has occurred ~ f_4's processing step # 25 N0), then _ $ t ° If a spark occurs (step The circuit board of α break 4 is defective (step # 33). If no spark occurs (YES in step # 25), count " cattle_7,), and measure the voltage V and current I (v Step # 27) 'Calculate the resistance step # 28 according to this voltage value ¥ and current 1', and then judge whether the calculated resistance value 1 is at the critical value.

Above Rref (step # 29), if the above-mentioned resistance value R is set above the critical value (YES in step # 29), it is judged that the insulation status of the wiring room is good (step # 30). When the processing is completed (YES in step # 31), the circuit board is judged to be a good product (step # 32), and the insulation inspection is ended. If the resistance value R is smaller than the critical value (N0 in step # 29) ', it is judged that the circuit board is defective (step # 33). However, the spark does not only occur during the transition period immediately after the voltage is applied (voltage 2014-5547-PF (Nl) .ptd 200307139 V. Description of the invention (17) rising period), it may also occur during the voltage stabilization period . In this case, as described above, a circuit board having a spark in the stable period up to time t2 is judged as a defective product. However, when a voltage is continuously applied after time 12, For the circuit board where sparks are generated after the time 12 described above, it may occur that if the insulation is determined to be qualified at time t2, it is also judged to be a good product. In this way, the circuit board judged to be a good product is mixed again. For example, when the inspector of the shipping destination of the circuit board performs a new insulation inspection on the substrate after the time mark of the time 7: 2. A circuit board that is judged to be a defective product, and if the number of defective products is relatively large compared to the number of good products, the reliability of the product (circuit board) will be impaired. Therefore, as long as the insulation inspection potential μ is delayed, it must be seen from the inside of the beast-it is regarded as 1 = til the break time, it can be in a long time ^ = whether cremation has occurred, so that the trust of the product can be improved. 2 4 Incheon = In this case, because the time required for one insulation inspection is increased, the inspection efficiency is reduced. Borrowing this is exactly the same; 5 West +,, ^ Set one, as shown in the figure] Zanyou & 々Wei Wei, on the structure of the above-mentioned embodiment, set the operation equipment magic two and the configuration line in the second "inspector The time setting for changing the judgment time is set to 64: r :: charge = check accuracy (the trust of the product 4 — f is good, and the judgment device 11 is taken into full consideration to change the judgment. The balance between the inspection efficiency It is composed of operation buttons for executing the operation device 11. For example, a group of people can delay the judgment of the time of eight α, and based on the above time t2, it can be advanced or can be set by a predetermined ": every time the button is pressed once 'Judge a time between k 寸 or a delay delayed at time t 2

2014-5547-PF (Nl) ptd page 21 200307139 V. Description of the invention (18) structure. According to this structure, as shown in FIG. 5, when the time 13 that is a predetermined time delay from the time 12 is set as the judgment time, because it can be detected that it is not detected in the above embodiment, between time t 2 and time 13 Sparks (as shown by the dotted line E), so that the circuit board is judged to be defective, which can reduce the time when the circuit board is shipped as described above, and the inspector re-insulates the substrate. The circuit board 'judged to be a defective product can improve the reliability of the product. Effects of the Invention According to the insulation inspection device for a circuit board according to the present invention, since a predetermined DC voltage is applied between wirings, a current flowing between the wirings is detected at the same time as the current caused by the applied voltage is detected. Detect the current coming from to calculate the insulation resistance value between this wiring, and then judge whether the circuit board is good according to this resistance value, and when there is a gap between the wiring due to the applied voltage When a spark occurs, the circuit board is judged directly as “No”. Therefore, it is possible to surely prevent a circuit board where a spark is generated from being mixed into a circuit board judged to be a good product based on resistance value judgment. "^ And i According to the present invention, since a given direct current is applied between the wirings ^ ^ ^ 上述 The above-mentioned direct current is applied with a wiring having a small area as a high potential [so, the spark current flowing when a spark occurs is smaller than that of a large area. Wiring acts as a potential for 鬲 potential, which can reduce the damage caused by sparks, wiring, etc., and the time required for χ to connect a ^ 4 i 因为 due to the lightning between the applied DC voltage lines will be less than the area Large wiring as high

200307139 V. Description of the invention (19) The situation of the potential is shorter, so that it can be judged in advance whether the circuit substrate is good based on the above resistance value, thereby shortening the inspection time. Furthermore, in the case of detecting sparks based on a change in voltage, the wiring with a small area is larger than the wiring with a large area due to the voltage change due to the occurrence of the spark. Therefore, it is possible to accurately use the wiring with a small area as a high potential. Spark detected. In addition, the present invention is also provided with an operating device for changing the above-mentioned predetermined time for judging whether the circuit board is good or not, so that the reliability of the product and the balance of the inspection effect can be taken into consideration, and the above-mentioned predetermined time can be freely set.

2014-5547-PF (Nl) ptd page 23 200307139 Brief description of the drawings Fig. 1 is a schematic structural diagram of an embodiment of an insulation inspection device according to the present invention. Figure 2 is a flowchart of the insulation inspection method. FIG. 3 is a flowchart of another embodiment of the insulation inspection method. FIG. 4 is a schematic structural diagram of a conventional insulation inspection device. Fig. 5 is a diagram showing changes in voltage between wirings, current flowing between wirings, and resistance values. DESCRIPTION OF SYMBOLS 2 Voltage source 4 Switching circuit 6 Control device 8 D / A converter 1 0 A / D converter 61 Conversion control device 6 3 Judging device 6 4 Time setting device 1 0 1 Voltage source 1 Insulation inspection device 3 Voltmeter 5 Ammeter 7 Spark detection circuit 9 A / D converter 11 Operating device 62 Resistance value calculation device 6 3 a Timer 1 0 0 Insulation device 1 0 2 Voltmeter 1 0 3 Switch 1 0 4 Ammeter 1 0 5 Control device

2014-5547-PF (Nl) .ptd Page 24

Claims (1)

200307139 VI. Application for patent scope 1 · A fixed DC moment, according to the characteristics of the resistance value and the characteristics of the spark flowing between the wires. If the wiring is judged, then judge 2. If it is applied, among them, the area with a small area is 3 If applied, among them, 4 at a predetermined time. If applied, where the voltage detection spark judgment occurs. 5. If applied, in which the voltage of the circuit board is sampled, and the above-mentioned voltage value and current value are used to determine the circuit. The test device includes: a test device, which is set with the generated spark. Once the circuit board is patented, the scope of the patent is to the above. Wiring as a high power patent also covers the use of the device to operate. The scope of the patent claims the above-mentioned spark detection device, the breaking device, the scope of the patent claims the above-mentioned spark detection device, according to 2014-5547-PF (Nl) ptd page 25, Pakistan, taste inspection device, between the wiring, the voltage between the existing wiring is stable when the voltage of the predetermined force application port voltage caused by the above wiring, out of the above wiring The resistance value between the substrates is good, and the root cause is: measure the spark voltage caused by the above detection device caused by the application of the above-mentioned detection device. The circuit board's insulation test has a predetermined DC voltage applied between time and time. 1 Apply the above DC voltage. The circuit board's absolute change to determine whether or not the circuit board is good: 2: The insulation test device for the circuit board of item 1 includes:-It is installed to detect the above-mentioned applied voltage; and it is judged that there is a spark when the applied voltage suddenly drops. The test device for the insulation inspection and testing of the circuit board includes: ~ Sampling the applied voltage at a predetermined cycle · 200307139 Comparison device 6. Compare the number of people with the number of persons applying for the patent application. In addition, it also includes a process control device. The board Λ insulation inspection device detects that a spark has occurred, and does not perform the inspection of the circuit board although the cremation detection device-once inspection. The inspection process of moxibustion ends with a DC voltage of 7 · — a kind of insulation inspection of the circuit board, and a given time is applied between the above wiring and the second wiring. According to the above voltage value and the predetermined value when applied = j Based on the current value flowing between the lines, the resistance value in the wiring caused by the above 1 is calculated to determine whether the circuit board is the resistance value between f, and it is further characterized by including the following steps: The spark has been drawn away, and the spark occurred between the above wirings; and the voltage is stable. Once a spark is detected, if the circuit board is good, Xiao judges whether the tube is judged based on the resistance value. Patent Application Scope 7]: V: / Board is defective. The method for determining the insulation of the circuit board and the circuit board may be arbitrarily set in advance. If the board is a good predetermined time, it can be 9 • As the seventh method of the scope of patent application, which is based on the insulation inspection of the circuit board to detect the applied voltage 10. If the scope of the patent application is 4 :: drop to detect the spark occur. In the method, when a spark is detected, the insulation inspection method of the circuit board is inspected. If there is a chemical compound, the end of the circuit board