JP2009295856A - Electrolytic capacitor examination method and electrolytic capacitor examination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform an accurate examination by enabling a chuck defect to be detected. <P>SOLUTION: A power source unit 13 is configured by connecting in series a resistor 13b and a DC power source 13c between an anode output terminal 13d and a cathode output terminal 13e. A DC voltage V from the DC power source 13c is applied between an anode terminal 3 and a cathode terminal 4 of an electrolytic capacitor 1 from the power source unit 13. A waveform A between a case 5 of the electrolytic capacitor 1 and the anode output terminal 13d is measured from the application start of the DC voltage V and a determination area B is compared with the waveform A. If the overall waveform A is included in the determination area B, a non-short-circuited state is discriminated with the anode terminal 3 and the case 5 not short-circuited. If the waveform A is not partially included in the determination area B, either a short-circuited state with the anode terminal 3 and the case 5 short-circuited or a non-connected state with the cathode output terminal 13e and the cathode terminal 4 not connected is discriminated or a non-connected state is discriminated with the anode output terminal 13d and the anode terminal 3 not connected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is an electrolytic capacitor inspection method for inspecting the presence or absence of a short circuit between an anode terminal of an electrolytic capacitor formed by enclosing a capacitor element in which an anode terminal and a cathode terminal are erected in a metal case, and the case, And an electrolytic capacitor inspection apparatus.

  As this type of electrolytic capacitor inspection method, an electrolytic capacitor inspection method disclosed in Patent Document 1 below is known. In this method for inspecting an electrolytic capacitor, a short circuit between the case and the lead wire is inspected by applying a voltage between the case made of metal (for example, aluminum) and the lead wire. Although this patent document 1 does not describe a specific configuration of the inspection circuit, for example, as in the inspection circuit 101 shown in FIG. The chuck portion 11a that is in contact with the anode terminal 3, the chuck portion 11b that is in contact with the cathode terminal 4 of the electrolytic capacitor 1 and the chuck portion 11a and the anode 102a of the DC power source 102 are disconnected (connected) A switch 104 that is turned on / off) and a DC voltmeter 105 that measures the voltage between the pair of chuck portions 11a and 11b are generally used.

  In this inspection method using the inspection circuit 101, first, the anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 are chucked by the chuck portions 11 a and 11 b, and then the switch 104 is turned on and the DC power source 102 is used. The electrolytic capacitor 1 is shifted to a fully charged state. Subsequently, the switch 104 is shifted to the OFF state, and the holding voltage of the electrolytic capacitor 1 is measured by the DC voltmeter 105 after a predetermined time has elapsed since the completion of charging. In this case, if a short circuit does not occur between the anode terminal 3 of the electrolytic capacitor 1 and the case 5, the holding voltage is maintained above the threshold value, and a short circuit occurs between the anode terminal 3 and the case 5. Sometimes the holding voltage is below the threshold. Therefore, the presence or absence of a short circuit between the anode terminal 3 of the electrolytic capacitor 1 and the case 5 is inspected by comparing the holding voltage with the threshold value. As another inspection method, as shown in FIG. 11, the anode terminal 3 of the electrolytic capacitor 1 is chucked by the chuck portion 11a, and each probe of the DC resistance meter 111 is brought into contact with the anode terminal 3 and the case 5. A method of inspecting a short circuit state by measuring a resistance value between the anode terminal 3 and the case 5 by using a DC resistance meter 111 is also generally performed.

Japanese Patent No. 2542961 (page 1-2, Fig. 1)

  However, the following problems exist in the above-described electrolytic capacitor inspection method. That is, this electrolytic capacitor inspection method may be performed by an automatic inspection device in an inspection line. In this case, the electrolytic capacitor 1 is normally in an inverted state, that is, the anode terminal 3 and the cathode terminal, with the case 5 side accommodated in each recess of a transfer tray (not shown) having a plurality of recesses formed on the surface. In a state where 4 protrudes upward from the case 5, it is conveyed to the inspection position. Since the transfer tray is formed of a conductive material, the case 5 is in a state of being electrically connected to the transfer tray. Therefore, for example, in the automatic inspection apparatus including the inspection circuit 101 of FIG. 10, the contact of the cathode 102b of the DC power source 102 and the DC voltmeter 105 with respect to the case 5 is performed via the transfer tray. On the other hand, for the anode terminal 3 and the cathode terminal 4, the automatic inspection apparatus first moves the chuck portions 11 a and 11 b above the recess in which the electrolytic capacitor 1 to be inspected is accommodated, and then the anode terminal 3 and The chuck portions 11 a and 11 b are lowered to the cathode terminal 4. Subsequently, the chuck portions 11a and 11b are shifted to the chucked state, and the anode terminal 3 and the cathode terminal 4 are chucked.

  However, with respect to the electrolytic capacitor 1 in which the anode terminal 3 and the cathode terminal 4 are bent greatly, a state occurs in which the chucking of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b is not normally performed. In this case, the electrolytic capacitor 1 is not normally inspected. In the above-described electrolytic capacitor inspection method, the inspection is performed based on a static physical quantity such as a holding voltage of the electrolytic capacitor 1 after a predetermined time has elapsed from the completion of charging and a resistance value between the anode terminal 3 and the case 5. Therefore, when the inspection result that the electrolytic capacitor 1 is defective is obtained, it is distinguished whether the electrolytic capacitor 1 is actually defective or whether the inspection result that the electrolytic capacitor 1 is defective due to a defective chuck is obtained. Have difficulty. Therefore, the above-described electrolytic capacitor inspection method has a problem that an accurate inspection cannot be performed because a chuck failure cannot be detected.

  The present invention has been made to solve such a problem, and it is a main object of the present invention to provide an electrolytic capacitor inspection method and an electrolytic capacitor inspection apparatus capable of detecting a chuck failure and performing an accurate inspection.

  In order to achieve the above object, an electrolytic capacitor inspection method according to claim 1 is an electrolytic capacitor inspection method for inspecting for a short circuit between an anode terminal of the electrolytic capacitor and a case, the anode output terminal and the cathode output. A DC voltage from the DC power source is applied between the anode terminal and the cathode terminal of the electrolytic capacitor from a power source configured by connecting a resistor and a DC power source in series between the terminal, and the case and the The voltage waveform between the anode output terminal of the power supply unit is measured from the start of application of the DC voltage, and a predetermined determination area is compared with the measured voltage waveform. When included in the determination area, it is determined that the anode terminal and the case are not short-circuited, and at least a part of the voltage waveform is not included in the determination area Any of a short circuit state in which the anode terminal and the case are short-circuited and a non-connected state in which the cathode output terminal and the cathode terminal of the power supply unit are disconnected, or the anode of the power supply unit It is determined that the output terminal and the anode terminal are in a disconnected state in which they are disconnected.

  The method for inspecting an electrolytic capacitor according to claim 2 is the method for inspecting an electrolytic capacitor according to claim 1, wherein the anode terminal and the cathode terminal are erected in the case when the voltage waveform is measured. A pressure or vibration is applied between the capacitor element enclosed in the case and the case.

  The electrolytic capacitor inspection apparatus according to claim 3 is an electrolytic capacitor inspection apparatus that inspects for the presence or absence of a short circuit between the anode terminal of the electrolytic capacitor and the case, and chucks the anode terminal and the cathode terminal of the electrolytic capacitor. A resistor and a DC power source are connected in series between a pair of chuck portions and an anode output terminal and a cathode output terminal, and the anode output terminal is connected to one of the pair of chuck portions and the cathode output A power supply having a terminal connected to the other of the pair of chucks; and the case from the start of application of a DC voltage from the DC power supply of the power supply to the electrolytic capacitor chucked by the pair of chucks; A measurement process for measuring a voltage waveform between the power supply unit and the anode output terminal in one channel; a determination area stored in advance; The measured voltage waveform is compared, and when the measured voltage waveform is entirely within the determination area, it is determined that the anode terminal and the case are in a non-shorted state, and the measured When at least part of the voltage waveform is not included in the determination area, the anode terminal and the case are either short-circuited and the cathode output terminal and the cathode terminal are not connected, or the And a measuring device that executes a discrimination process for discriminating that the anode output terminal and the anode terminal are not connected.

  4. The electrolytic capacitor inspection method according to claim 1, and the electrolytic capacitor inspection apparatus according to claim 3, wherein the electrolytic capacitor is connected to the anode output terminal and the cathode output terminal by connecting a resistor and a DC power source in series. A DC voltage is applied between the anode terminal and the cathode terminal, and a voltage waveform between the case and the anode output terminal of the power supply unit is measured from the start of DC voltage application, and the measured voltage waveform is used as a determination area. In comparison, when the entire voltage waveform is within the determination area, it is determined that the anode terminal and the case are not short-circuited, and when at least a part of the voltage waveform is not included in the determination area, the anode Either the short-circuit state in which the terminal and the case are short-circuited or the non-connected state in which the cathode output terminal and the cathode terminal of the power supply unit are disconnected, or the anode output of the power supply unit An anode terminal of the child and the electrolytic capacitor is determined to be in an unconnected state to be disconnected.

  Therefore, according to the electrolytic capacitor inspection method and the electrolytic capacitor inspection apparatus, the quality of the electrolytic capacitor (whether or not the anode terminal and the case are in a short-circuited state) is detected, and the anode output terminal and the anode terminal are And whether the cathode output terminal and the cathode terminal are in the connected state or in the disconnected state can be detected, so that an accurate inspection of the electrolytic capacitor can be performed. In addition, since the electrolytic capacitor can be inspected including the chuck state by using only one channel of the measuring instrument, the apparatus configuration and the inspection method can be simplified.

  According to the method for inspecting an electrolytic capacitor according to claim 2, since the capacitor element can be pressed against the case and inspected, the anode foil and the cathode foil are manufactured by being wound out of the electrolytic paper, Probability of any foil (anode foil or cathode foil) in contact with the case in an electrolytic capacitor (electrolytic capacitor to be determined as defective) having an extremely small distance between the end of the electrolytic paper and the end of each foil As a result, the electrolytic capacitor to be determined as defective can be more reliably determined as defective. In addition, since an aluminum oxide film is present on the inner surface of the case, depending on the electrolytic capacitor, at least one of the foil, the anode terminal, and the cathode terminal is in contact with the case due to manufacturing defects. Even so, the oxide film may be temporarily in an insulating state (high resistance state). Such an electrolytic capacitor (an electrolytic capacitor that should be identified as defective) is determined as a non-defective product when no pressure or vibration is applied, but the oxide film can be physically destroyed by applying pressure or vibration. Thus, it can be determined as a failure.

  The best mode of an electrolytic capacitor inspection method and an electrolytic capacitor inspection device according to the present invention will be described below with reference to the accompanying drawings.

  First, a schematic configuration of the electrolytic capacitor 1 to be inspected will be described with reference to FIG. The electrolytic capacitor 1 has an anode terminal 3 and a cathode terminal 4 connected to an anode foil and a cathode foil (both not shown) cut into predetermined dimensions, respectively, and the anode foil and the cathode foil are connected to an electrolytic paper (not shown). Capacitor element 2 produced by winding in a state of interposing metal, metal case 5 in which capacitor element 2 is accommodated, and a sealing material for sealing capacitor element 2 accommodated in case 5 (one example) As rubber) 6 and a resin film 7 that electrically insulates the peripheral wall of the case 5. Further, the electrolytic capacitor 1 is equivalently connected between the anode terminal 3 and the cathode terminal 4 in a state of being connected in series with the capacitance C and the capacitance C, as shown in FIG. Equivalent series resistance Rs (hereinafter also referred to simply as “resistance Rs”, the resistance value is as small as 0.1Ω or less), leakage resistance R1 existing between the anode terminal 3 and the case 5, and the cathode terminal 4 A leakage resistance R2 existing between the case 5 and the case 5 is provided. In this case, the resistance value of the leakage resistance R1 is very large compared to the resistance value of the leakage resistance R2, and is about several tens of MΩ for a good product.

  Next, the configuration of the electrolytic capacitor inspection apparatus 10 will be described with reference to the drawings.

  As shown in FIG. 1, the electrolytic capacitor inspection apparatus 10 includes a pair of chuck portions 11 a and 11 b, a moving mechanism 12, a power source portion 13, a measuring instrument 14, and a control portion 15. The intervals between the chuck portions 11a and 11b are made to correspond to the interval between the anode terminal 3 and the cathode terminal 4 (the interval between the erected anode terminal 3 and the cathode terminal 4). The chuck portion 11b is configured to be able to chuck the cathode terminals 4 respectively. Further, the chuck portions 11a and 11b operate based on the control signal S1 from the control portion 15, and shift to either the chuck state or the non-chuck state. The moving mechanism 12 operates based on the control signal S2 from the control unit 15 to move the chuck units 11a and 11b three-dimensionally above the inspection position with respect to the electrolytic capacitor 1. As an example, the electrolytic capacitor 1 has a case 5 accommodated in a plurality of recesses formed on the surface of a transfer tray formed of a conductive material in the same manner as in the past, and a plurality of electrolytic capacitors 1 are simultaneously placed in an inspection position in an inverted state. Be transported. The moving mechanism 12 moves the chuck portions 11a and 11b to the electrolytic capacitor 1 to be inspected accommodated in the recess by the control unit 15 based on the control signal S2 from the control unit 15.

  The power supply unit 13 includes a switch 13a, a resistor 13b, and a DC power supply 13c connected in series with each other, and these series circuits are connected between an anode output terminal 13d and a cathode output terminal 13e. In this case, the connection / disconnection state (on / off state) of the switch 13a is controlled by the control signal S3 from the control unit 15. The anode output terminal 13d is connected to the chuck portion 11a, and the cathode output terminal 13e is connected to the chuck portion 11b. In addition, the resistance 13b is regulated to an appropriate numerical value corresponding to the capacitance C of the electrolytic capacitor 1 to be inspected (for example, 50Ω when C is 2200 μF, 200Ω when C is 500 μF), and the DC power supply The electrolytic capacitor 1 is slowly charged by 13c.

  The measuring instrument 14 includes a voltage detection probe 14a connected to the positive input terminal of one channel and a voltage detection probe 14b connected to the negative input terminal of this one channel, and can perform measurement processing and discrimination processing. It is configured. Further, the measuring instrument 14 includes a display unit 14c for displaying a waveform (voltage waveform) A measured in the measurement process and a determination area (area indicated by oblique lines) B stored in advance, and a determination result in the determination process. The indicator 14d which displays is provided. Further, the measuring instrument 14 executes the above-described measurement processing and the like with the input of the control signal S4 from the control unit 15 as a trigger. In this case, in the determination area B, the anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 which is a non-defective product (a state where the anode terminal 3 and the case 5 are not short-circuited) are normally chucked by the chuck portions 11a and 11b. In this state, when the switch 13a of the power supply unit 13 is turned on, the waveform A (the voltage generated in the leakage resistance R1) is measured in one channel of the measuring instrument 14 through the voltage detection probes 14a and 14b. The shape of the area is defined so that all of the waveform A for the good electrolytic capacitor 1 is included in consideration of the variation of the good electrolytic capacitor 1 and the like. Further, the measuring instrument 14 outputs a completion signal S5 to the control unit 15 when the inspection of one electrolytic capacitor 1 is completed.

  The control unit 15 is configured by a CPU or the like, and detects completion of movement of the transport tray to the inspection position or completion of inspection of one electrolytic capacitor 1 to detect the chuck units 11a and 11b, the moving mechanism 12, and the power supply unit 13. Executes control for. Further, the control unit 15 outputs a control signal S4 to the measuring instrument 14 to start measurement processing and the like.

  Next, an electrolytic capacitor inspection method will be described together with the operation of the electrolytic capacitor inspection apparatus 10.

  In the electrolytic capacitor inspection apparatus 10, in the operating state, when the control unit 15 detects the completion of the movement of the new transport tray to the inspection position, the inspection process 50 for the electrolytic capacitor 1 is started (see FIG. 9). In this inspection process, the control unit 15 first outputs a control signal S2 to the moving mechanism 12, and first moves the chuck units 11a and 11b to the position of the electrolytic capacitor 1 to be inspected (step 51). Is completed, the control signal S1 is output to the chuck portions 11a and 11b to shift to the chuck state (step 52). In this case, when the electrolytic capacitor 1 is accommodated in the transfer tray in a normal state and the anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 are not bent (when the bending is within an allowable range). The anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 are chucked by the chuck portions 11a and 11b. On the other hand, when the bending occurring in the anode terminal 3 or the cathode terminal 4 exceeds the allowable range, even if the chuck portions 11a and 11b shift to the chucked state, the anode terminal 3 and the cathode terminal 4 are not in the chuck portions 11a and 11b. Is not chucked. When the chuck part 11a normally chucks the anode terminal 3, the anode output terminal 13d of the power supply part 13 is connected to the anode terminal 3, so that the voltage detection probe 14a in one channel of the measuring instrument 14 also outputs the anode. The anode terminal 3 is connected via the terminal 13d and the chuck portion 11a. When the chuck part 11 b normally chucks the cathode terminal 4, the cathode output terminal 13 e of the power supply part 13 is connected to the cathode terminal 4.

  Next, the control unit 15 outputs a control signal S4 to the measuring instrument 14. Thereby, the measuring instrument 14 performs the measurement process and the discrimination process in this order (step 53). The control unit 15 outputs the control signal S3 to the power supply unit 13 for a predetermined time in synchronization with the output of the control signal S4. As a result, in the power supply unit 13, the switch 13a is shifted (controlled) from the OFF state to the ON state for a predetermined time, and the DC voltage V of the DC power supply 13c is supplied to the anode terminal 3 of the electrolytic capacitor 1 via the resistor 13b and the switch 13a. And is applied between the cathode terminal 4 for a predetermined time.

  In the measurement process, the measuring instrument 14 measures a voltage generated between the case 5 of the electrolytic capacitor 1 and the chuck portion 11a (in this example, the anode terminal 3 of the electrolytic capacitor 1) for a predetermined time, and the waveform A Remember. Thereby, the measurement process is completed. Next, the measuring instrument 14 displays the stored waveform A and the preliminarily stored determination area B on the display unit 14c simultaneously (overlapping) as shown in FIG. Next, the measuring instrument 14 executes a discrimination process. In this determination process, the measuring instrument 14 determines whether or not the entire waveform A is included in the determination area B, and determines that the electrolytic capacitor 1 is a good product when the entire waveform A is included. Further, when at least a part of the waveform A is not included in the determination area B, the electrolytic capacitor 1 is defective or a chuck error occurs in at least one of the chuck of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b. It is determined that (chuck failure) has occurred, and that effect is displayed on the indicator 14d. Thereby, the discrimination process by the measuring instrument 14 is completed.

  This determination process will be described in detail. The electrolytic capacitor 1 is a non-defective product (that is, the anode terminal 3 and the case 5 are not short-circuited), and the anode terminal 3 by the chuck portions 11a and 11b. When the chucking of the cathode terminal 4 is normally performed, the current I is supplied to the electrolytic capacitor 1 from the DC power supply 13c of the power supply unit 13 through the path shown in the right diagram of FIG. For this reason, the electrolytic capacitor 1 is charged with its own capacitance C by the current I. At this time, the waveform A (that is, the voltage generated between the anode terminal 3 and the cathode terminal 4) measured by one channel of the measuring instrument 14 via the voltage detection probes 14a and 14b is divided by the leakage resistors R1 and R2. The voltage waveform generated between both ends of the leakage resistor R1 is defined by the capacitance C, the resistor 13b of the power supply unit 13 and the resistor Rs immediately after the voltage application start (time t1) by the power supply unit 13. Waveform that rises with a time constant (the resistance Rs is extremely small as described above, and is substantially the time constant defined by the capacitance C and the resistor 13b), as shown in the left diagram of FIG. Are included in the determination area B. Therefore, the measuring instrument 14 determines that the electrolytic capacitor 1 is a non-defective product by executing a determination process. Further, the measuring instrument 14 displays on the indicator 14d that the electrolytic capacitor 1 to be inspected is a non-defective product.

  Further, when the cathode terminal 4 of the electrolytic capacitor 1 and the case 5 are short-circuited, the resistance value of the leakage resistance R2 becomes substantially zero as shown in the right diagram in FIG. Therefore, the waveform A measured by the measuring instrument 14 is generated between the anode terminal 3 and the cathode terminal 4 in a state where the chucking of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b is normally performed. Since the voltage is applied to the entire leakage resistance R1, as shown in the left diagram in FIG. 4, from the waveform A (left diagram in FIG. 3) of the electrolytic capacitor 1 in which the cathode terminal 4 and the case 5 are not short-circuited. Also rises to a higher voltage. However, since the resistance value of the leakage resistance R2 is originally small, many electrolytic capacitors 1 are included in the determination area B as shown in the left diagram of FIG. Since the electrolytic capacitor 1 has no problem with the function as a capacitor, the measuring instrument 14 determines that the electrolytic capacitor 1 is a non-defective product and displays the fact on the indicator 14d.

  On the other hand, when the anode terminal 3 of the electrolytic capacitor 1 and the case 5 are short-circuited, the resistance value of the leakage resistance R1 is substantially zero as shown in the right figure of FIG. Therefore, even when the chucking of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b is performed normally, as shown in the left diagram of FIG. It remains at zero volts and does not change. For this reason, the waveform A is not included in the determination area B immediately after the voltage application start (time t1) by the power supply unit 13 (specifically, the voltage is lower than the lower limit voltage value of the determination area B). . Even if the electrolytic capacitor 1 is a non-defective product, as shown in FIG. 6, when a chuck failure (a state in which the cathode terminal 4 is not chucked) occurs in the chuck portion 11b, the electrolytic capacitor 1 by the power source portion 13 is used. Is not charged. Therefore, also in this case, the waveform A measured by the measuring instrument 14 is a voltage lower than the lower limit voltage value of the determination area B without changing from zero volts as shown in the left diagram in FIG. . Therefore, when the waveform A is not included in the determination area B in the form shown in the left diagram of FIG. 5, the measuring instrument 14 is in a state where the anode terminal 3 and the case 5 are short-circuited or the chuck portion. In 11b, it is determined that there is a chuck failure with respect to the cathode terminal 4, and the fact is displayed on the indicator 14d.

  Even if the electrolytic capacitor 1 is a non-defective product, as shown in FIG. 7, when a chuck failure (a state where the anode terminal 3 is not chucked) occurs in the chuck portion 11a, the DC power source 13c of the power source portion 13 is used. , The current I is not supplied to the electrolytic capacitor 1 through the regular path (path shown in FIG. 3), and the path shown in the right diagram in FIG. 7 (internal resistance Ri of the measuring instrument 14 (FIGS. 2 and 7) The current I is supplied in the path including the reference). In this path, the capacitance C is included in a state where the leakage resistance R1 having a very large resistance value is connected in series and the series circuit and the leakage resistance R2 having a small resistance value are connected in parallel. For this reason, the waveform A measured by the measuring instrument 14 is hardly affected by the presence of the capacitance C, and as shown in the left diagram of FIG. Immediately after the start of application (time t1), the voltage rapidly increases and becomes a voltage higher than the upper limit voltage value of the determination area B, and thereafter the waveform gradually decreases. Therefore, when the waveform A is in a state not included in the determination area B in the form shown in the left diagram of FIG. 7, the measuring instrument 14 determines that a chuck failure has occurred in the chuck portion 11 a, and The effect is displayed on the indicator 14d. Note that the waveform A as shown in the left diagram of FIG. 7 indicates that the electrolytic capacitor 1 is in a wrong mounting state in which the electrolytic capacitor 1 is rotated 180 ° from the normal storage state and stored in the concave portion of the transport tray, that is, the cathode in the chuck portion 11a. This also occurs when a chuck failure occurs in the chuck portion 11a in a state where the terminal 4 is to be chucked.

  Further, even when the electrolytic capacitor 1 is a non-defective product and the chucking of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b is normally performed, for example, the electrolytic capacitor 1 is a transfer tray. As shown in the right figure in FIG. 8, the cathode terminal 4 is chucked by the chuck portion 11a and the anode terminal 3 is chucked by the chuck portion 11b due to being housed in the concave portion in the above-described erroneous mounting state. When the measuring instrument 14 is in a reverse state (reverse mounting state), the voltage detector probes 14a and 14b of the measuring instrument 14 are connected between both ends of the leakage resistance R1 whose resistance value is significantly smaller than that of the leakage resistance R1. . For this reason, the waveform A measured by the measuring instrument 14 increases only to a very low voltage although it gradually increases immediately after the start of voltage application (time t1) by the power supply unit 13 as shown in the left diagram of FIG. Therefore, it is lower than the lower limit voltage value of the determination area B. Therefore, when the waveform A is not included in the determination area B in the manner shown in the left diagram of FIG. 8, the measuring instrument 14 has the anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 connected to the chuck portion 11a. , 11b is chucked in the reverse mounting state (reverse polarity), and the fact is displayed on the indicator 14d.

  The measuring instrument 14 outputs a completion signal S5 to the control unit 15 when the measurement process and the discrimination process for one electrolytic capacitor 1 to be inspected are completed. When the completion signal S5 is input, the control unit 15 outputs the control signal S1 to the chuck units 11a and 11b to shift to the non-chuck state (step 54). Next, the control unit 15 determines whether or not an untested electrolytic capacitor 1 is present (step 55). If present, the control unit 15 proceeds to step 51 to determine the electrolytic capacitor 1 to be inspected next. The chuck portions 11a and 11b are moved to positions. The control unit 15 repeats the above steps 51 to 55 to continue the inspection of the electrolytic capacitor 1 accommodated in the transfer tray. On the other hand, when it is determined in step 55 that there is no untested electrolytic capacitor 1, the control unit 15 moves the chuck portions 11a and 11b to the retracted position (step 56). Thereby, the inspection process is completed. Accordingly, the operator observes the display of the indicator 14d of the measuring instrument 14 and the waveform A displayed on the display unit 14c, thereby judging the quality of the electrolytic capacitor 1 and the anode terminal 3 by the chuck units 11a and 11b. Also, it is possible to determine whether the cathode terminal 4 is in a chucked state.

  Thus, in this electrolytic capacitor inspection apparatus 10 and the electrolytic capacitor inspection method executed by this electrolytic capacitor inspection apparatus 10, the resistor 13b and the DC power supply 13c are connected in series between the anode output terminal 13d and the cathode output terminal 13e. A DC voltage V is applied between the anode terminal 3 and the cathode terminal 4 of the electrolytic capacitor 1 from the power supply unit 13 configured as described above, and a waveform A between the case 5 and the anode output terminal 13d of the power supply unit 13 is generated. Measured from the start of application of the DC voltage V (time t1), and the measured waveform A is compared with the determination area B. When the entire waveform A is in the determination area B, the interval between the anode terminal 3 and the case 5 is Is determined to be in a non-short-circuit state, and when at least a part of the waveform A is not included in the determination area B (when it is outside the determination area B), based on the shape of the waveform A, A short-circuited state in which the electrode terminal 3 and the case 5 are short-circuited and a non-connected state in which the cathode output terminal 13e and the cathode terminal 4 of the power supply unit 13 are disconnected (a state in which a chuck failure occurs in the chuck unit 11b). It is determined that the state is either one or a non-connected state in which the anode output terminal 13d of the power supply unit 13 and the anode terminal 3 are not connected (a state in which a chuck failure occurs in the chuck unit 11a).

  Therefore, according to the electrolytic capacitor inspection apparatus 10 and the electrolytic capacitor inspection method, it is possible to detect the quality of the electrolytic capacitor 1 and the chuck failure of the anode terminal 3 and the cathode terminal 4 by the chuck portions 11a and 11b. An accurate inspection for the electrolytic capacitor 1 can be executed. Further, according to the electrolytic capacitor inspection apparatus 10 and the electrolytic capacitor inspection method, the electrolytic capacitor 1 can be inspected including the chuck state by using only one channel of the measuring instrument 14. The apparatus configuration and the inspection method can be simplified.

  In addition, this invention is not limited to said structure. For example, when the DC voltage V is applied from the power supply unit 13 to the electrolytic capacitor 1 and the waveform A is measured by the measuring instrument 14, the control unit 15 outputs the control signal S 2 to the moving mechanism 12. On the other hand, it is also possible to perform control to further move the chuck portions 11a and 11b to the electrolytic capacitor 1 side. As a result, the capacitor element 2 receives pressure from the chuck portions 11 a and 11 b via the anode terminal 3 and the cathode terminal 4 and is pressed against the case 5. For this reason, as a result of the anode foil and the cathode foil being manufactured by being wound with respect to the electrolytic paper, the electrolytic capacitor 1 having a very small distance between the end of the electrolytic paper and the end of each foil (defective) Therefore, it is possible to increase the probability that any one of the foils comes into contact with the case 5, because the capacitor element 2 can be pressed against the case 5 and inspected. It is possible to more reliably determine that the electrolytic capacitor 1 to be determined as defective is defective. Further, since an aluminum oxide film is present on the inner surface of the case 5, depending on the electrolytic capacitor 1, at least one of the foil, the anode terminal 3, and the cathode terminal 4 is in contact with the case 5 due to manufacturing defects. Even in this state, the oxide film may temporarily be in an insulating state (high resistance state). Such an electrolytic capacitor 1 (electrolytic capacitor 1 to be determined as defective) is determined as a non-defective product in the state where no pressure or vibration is applied, but the oxide film is physically destroyed by applying pressure or vibration. Thus, it can be determined as a failure.

  For this reason, the control unit 15 outputs the control signal S2 to the moving mechanism 12, thereby causing the moving mechanism 12 to perform control for moving the chuck units 11a and 11b forward and backward with respect to the electrolytic capacitor 1. it can. According to this configuration, it is possible to apply vibration to the capacitor element 2 of the electrolytic capacitor 1, and it is possible to more reliably determine that the electrolytic capacitor 1 to be determined as defective as described above is defective. it can. In the above example, pressure and vibration are applied to the capacitor element 2 of the electrolytic capacitor 1 by controlling the moving mechanism 12, but a dedicated mechanism (vibration applying unit) for applying pressure and vibration is used. Can also be provided.

1 is a configuration diagram showing a configuration of an electrolytic capacitor 1 and a configuration of an electrolytic capacitor inspection device 10. FIG. 3 is an explanatory diagram for explaining an equivalent circuit of the electrolytic capacitor 1. FIG. FIG. 2 is a partial configuration diagram of the electrolytic capacitor inspection device 10 in a state where the good electrolytic capacitor 1 is normally chucked, and an explanatory diagram for explaining a waveform A and a determination area B displayed on the display unit 14c in this state. The partial block diagram of the electrolytic capacitor inspection apparatus 10 in a state where the electrolytic capacitor 1 in which the cathode terminal 4 is short-circuited with the case 5 is normally chucked, and the waveform A and the determination area B displayed on the display unit 14c in this state are described. It is explanatory drawing for doing. The partial block diagram of the electrolytic capacitor inspection apparatus 10 in a state where the electrolytic capacitor 1 in which the anode terminal 3 is short-circuited with the case 5 is normally chucked, and the waveform A and the determination area B displayed on the display unit 14c in this state are described. It is explanatory drawing for doing. It is a partial block diagram of the electrolytic capacitor inspection apparatus 10 in a state where a chuck failure has occurred in the chuck portion 11b. It is the partial block diagram of the electrolytic capacitor inspection apparatus 10 in the state where the chuck | zipper defect has arisen in the chuck | zipper part 11a, and explanatory drawing for demonstrating the waveform A and the determination area B which are displayed on the display part 14c in this state. Partial configuration diagram of the electrolytic capacitor inspection device 10 in a state where the electrolytic capacitor 1 is chucked in the reversely mounted state (reverse polarity) on the chuck portions 11a and 11b, and the waveform A and the determination area displayed on the display portion 14c in this state It is explanatory drawing for demonstrating B. FIG. 4 is a flowchart showing an inspection process 50 of the electrolytic capacitor inspection device 10. 1 is a configuration diagram of a conventional inspection circuit 101 for an electrolytic capacitor 1. FIG. 2 is a configuration diagram in the case of inspecting the electrolytic capacitor 1 using a DC resistance meter 111. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrolytic capacitor 2 Capacitor element 3 Anode terminal 4 Cathode terminal 5 Case 11a, 11b Chuck part 13 Power supply part 13b Resistance 13c DC power supply 13d Anode output terminal 13e Cathode output terminal 14 Measuring instrument 14a, 14b Voltage detection probe 15 Control part A Waveform ( Voltage waveform)
B Judgment area V DC voltage

Claims (3)

An electrolytic capacitor inspection method for inspecting the presence or absence of a short circuit between the anode terminal of the electrolytic capacitor and the case,
A DC voltage from the DC power supply is applied between the anode terminal and the cathode terminal of the electrolytic capacitor from a power supply unit configured by connecting a resistor and a DC power supply in series between the anode output terminal and the cathode output terminal. A voltage waveform between the case and the anode output terminal of the power supply unit is measured from the start of application of the DC voltage,
A predetermined determination area and the measured voltage waveform are compared, and when the entire voltage waveform is included in the determination area, it is determined that the anode terminal and the case are not short-circuited. When the voltage waveform is not included in the determination area, the anode terminal and the case are short-circuited and the cathode output terminal and the cathode terminal of the power supply unit are not connected. A method for inspecting an electrolytic capacitor that determines that any one of the unconnected states or the unconnected state in which the anode output terminal and the anode terminal of the power supply unit are disconnected from each other.   2. The electrolytic capacitor according to claim 1, wherein, when the voltage waveform is measured, the anode terminal and the cathode terminal are erected and pressure or vibration is applied between the case and the capacitor element enclosed in the case. Inspection method. An electrolytic capacitor inspection device for inspecting the presence or absence of a short circuit between the anode terminal of the electrolytic capacitor and the case,
A pair of chuck portions for chucking the anode terminal and the cathode terminal of the electrolytic capacitor;
A resistor and a DC power source are connected in series between the anode output terminal and the cathode output terminal, the anode output terminal is connected to one of the pair of chuck portions, and the cathode output terminal is connected to the pair of chuck portions. A power supply connected to the other of
One voltage waveform between the case and the anode output terminal of the power supply unit from the start of application of a DC voltage from the DC power supply of the power supply unit to the electrolytic capacitor chucked by the pair of chuck units The measurement processing measured in the channel is compared with the determination area stored in advance and the measured voltage waveform. When the measured voltage waveform is entirely within the determination area, the anode terminal and the case Between the anode terminal and the case is short-circuited and the cathode output terminal when at least part of the measured voltage waveform is not included in the determination area And a determination process for determining whether the anode terminal is in a disconnected state or the anode output terminal and the anode terminal are in a disconnected state Bets and has an electrolytic capacitor testing apparatus comprising a.

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