JP4905960B2 - Relay inspection device and board inspection device - Google Patents

Description

  The present invention relates to a relay inspection apparatus and a board inspection apparatus capable of inspecting erroneous mounting of a relay to be inspected mounted on a circuit board.

As a relay inspection apparatus, a circuit board inspection apparatus disclosed by the applicant in Japanese Patent Laid-Open No. 2006-153619 is known. In this circuit board inspection apparatus, the inspection unit outputs an inspection signal to an electronic component such as a relay mounted on the circuit board, and measures the resistance value of the electronic component. The inspection unit determines the quality of the electronic component by comparing the measured resistance value with the reference value for inspection. In this case, for example, when the inspection target relay is out of order, even if a drive voltage is supplied to the coil portion, the contact portion does not operate normally and maintains a non-contact state. For this reason, in that case, the measured resistance value of the contact portion exceeds the reference value. Therefore, in this circuit board inspection apparatus, it is possible to detect, for example, a relay failure by setting an allowable upper limit resistance value of a normally operating contact portion as a reference value. .
2006-153619 (page 5-7, FIG. 1)

  However, this circuit board inspection apparatus has the following problems to be improved. That is, in this circuit board inspection apparatus, the quality of the relay to be inspected is determined based on the resistance value of the contact portion. On the other hand, there are a plurality of types (specifications) of relays that have the same shape but different rated voltages of the coil portions. For this reason, relays with different specifications may be erroneously mounted on the circuit board. At this time, for example, when a relay having a rated voltage lower than the voltage value of the drive voltage supplied to the coil portion during inspection is erroneously mounted, the contact portion operates normally even though an extra current flows in the coil portion. For this reason, in this case, as a result of the measured resistance value of the contact portion being lower than the reference value, it is determined that a non-defective relay is correctly mounted as the inspection target relay. Therefore, in this circuit board inspection apparatus, when a relay having a different specification is erroneously mounted, there is a possibility that the erroneous mounting may be missed, and it is preferable to improve this point.

  The present invention has been made in view of such a problem to be improved, and a main object of the present invention is to provide a relay inspection apparatus and a board inspection apparatus that can inspect for erroneous mounting of relays having different specifications.

  In order to achieve the above object, the relay inspection apparatus according to claim 1 is a power supply unit that supplies a voltage to a coil unit of a relay to be inspected mounted on a circuit board, and the voltage is supplied to the coil unit. The current detection unit for detecting the current flowing through the coil unit is compared with the current value of the detected current and a predetermined reference current value, and the mounting of the inspection target relay is poor based on the comparison result And a determination unit for determining that.

  The relay inspection apparatus according to claim 2 is the relay inspection apparatus according to claim 1, wherein the determination unit has a current value of the detected current exceeding an upper limit current value defined in advance as the reference current value. Sometimes it is determined that the relay to be inspected is defective.

  The relay inspection apparatus according to claim 3 is the relay inspection apparatus according to claim 1 or 2, wherein the determination unit is configured such that a current value of the detected current is lower than a lower limit current value defined in advance as the reference current value. The mounting of the inspection object relay is determined to be defective.

  A relay inspection device according to claim 4 is the relay inspection device according to claim 1, further comprising a resistance value detection unit that detects a resistance value between a pair of contact portions of the relay to be inspected, and the determination unit includes the voltage When the current value of the detected current is within the range of the upper limit current value and the lower limit current value respectively defined in advance as the reference current value, and the detected resistance value The relay inspection apparatus according to claim 1, wherein the inspection object relay is determined to be a non-defective product when is less than a predetermined reference resistance value.

  A substrate inspection apparatus according to a fifth aspect includes the relay inspection apparatus according to any one of the first to fourth aspects.

  According to the relay inspection apparatus of claim 1, the determination unit compares the current value of the current flowing through the coil portion of the inspection target relay with a predetermined reference current value, and based on the comparison result, the inspection target relay Therefore, it is possible to reliably inspect for erroneous mounting of relays having different specifications.

  According to the relay inspection apparatus of claim 2, when the determination unit determines that the inspection target relay is mounted poorly when the current value of the current flowing through the coil portion of the inspection target relay exceeds the upper limit current value. Therefore, it is possible to surely inspect the erroneous mounting of a relay having a rated voltage lower than that of the relay to be mounted.

  According to the relay inspection apparatus of claim 3, when the determination unit determines that the mounting of the inspection target relay is defective when the current value of the current flowing through the coil portion of the inspection target relay is lower than the lower limit current value. Therefore, it is possible to surely inspect for erroneous mounting of a relay having a rated voltage higher than that of the relay to be mounted.

  According to the relay inspection apparatus of claim 4, the determination unit is configured such that the current value of the current flowing through the coil portion of the relay to be inspected is within the range between the upper limit current value and the lower limit current value, and the detected resistance value is the reference resistance. By determining that the relay to be inspected is a non-defective product when the value is less than or equal to the value, the quality of the relay itself can be reliably inspected.

  According to the board inspection apparatus of the fifth aspect, the same effect as the above-described relay inspection apparatus can be obtained.

  The best mode of a relay inspection apparatus and a board inspection apparatus according to the present invention will be described below with reference to the accompanying drawings.

  First, the configuration of the board inspection apparatus 1 to which the relay inspection apparatus and the board inspection apparatus according to the present invention are applied will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the substrate inspection apparatus 1 includes a pair of probes P1, P1, a pair of probes P2, P2, a pair of probes P3, P3, a voltage source 2, a current detection unit 3, a current source 4, and a voltage detection. Unit 5, storage unit 6, display unit 7, operation unit 8, and CPU 9. The relay 100 as the inspection target mounted on the circuit board 200 and the mounting quality (hereinafter referred to collectively as “good / bad”). Is also configured to be inspectable. The relay 100 includes a coil part 101 and a contact part 102. In this case, as the relay 100, there are a plurality of specifications with different rated voltages even though the shape is the same, and the coil resistance value Rm of the coil portion 101 for each relay is, for example, a relay with a rated voltage of 5V. If it is 150Ω, if it is a 12V relay, it is specified as 700Ω, and if it is a 24V relay, it is specified as 2900Ω. The higher the rated voltage, the larger the value.

  The pair of probes P1 and P1 are probes used to supply a DC voltage Vt to the coil unit 101 of the relay 100, and are connected to one end 101a (or one end 101a) of the coil unit 101 when the relay 100 is inspected. Circuit pattern) and the other end 101b (or a circuit pattern connected to the other end 101b). The pair of probes P2 and P2 are probes used to supply a direct current It to the contact portion 102, and when the relay 100 is inspected, a circuit pattern connected to one end 102a (or one end 102a) of the contact portion 102. ) And the other end 102b (or a circuit pattern connected to the other end 102b). The pair of probes P3 and P3 are probes used to detect the voltage of the contact portion 102, and when the relay 100 is inspected, one end 102a of the contact portion 102 (or a circuit pattern connected to the one end 102a) and others. The end 102b (or the circuit pattern connected to the other end 102b) is brought into contact with each other.

  The voltage source 2 corresponds to a power supply unit in the present invention, and generates and outputs a voltage Vt having a voltage value set from, for example, 5V, 12V, and 24V, under the control of the CPU 9. The current detection unit 3 includes a detection resistor, an A / D conversion circuit (not shown), and the like, and a current Id that flows through the coil unit 101 when the voltage Vt is supplied to the coil unit 101 of the relay 100. Is detected and current data Di is output. The current source 4 supplies the current It to the contact portion 102 of the relay 100 according to the control of the CPU 9 and maintains the current value at a set constant value (for example, 20 mA). The voltage detection unit 5 includes an A / D conversion circuit (not shown) and the like, and a voltage generated between both ends 102a and 102b of the contact unit 102 when the current It is supplied to the contact unit 102. Vd is detected and voltage data Dv is output.

  The storage unit 6 stores an operation program for the CPU 9 and also includes a reference current value Is1 (upper limit current value in the present invention) and a reference current value Is2 (lower limit current value in the present invention) used for determining whether the relay 100 is mounted. A plurality of sets are stored. In this case, both reference current values Is1, Is2 are defined in advance according to the type of relay 100 and the rated voltage. The reference current value Is1 means an upper limit current value allowed as a current flowing through the coil unit 101 when a voltage Vt having a voltage value equal to the rated voltage of the relay 100 is supplied to the coil unit 101. The reference current value Is1 Means a lower limit current value allowed as a current flowing in the coil unit 101 at that time. Furthermore, the storage unit 6 stores a reference resistance value Rs (for example, 10Ω) used for determining whether the mounted relay 100 itself is good or bad. For example, the display unit 7 is configured to include an LCD (Liquid Crystal Dispray) panel, and the CPU 9 displays the relay 100 itself and various images showing the quality of mounting, and the resistance value Rr between both ends 102a and 102b of the contact unit 102. Display according to the control. The operation unit 8 includes a start switch for starting inspection, a voltage value setting switch for setting the voltage value of the voltage Vt, a reference current value setting switch for setting the reference current values Is1 and Is2, and a current It current. Various switches such as a current value setting switch for setting a value and a reference resistance value setting switch for setting a reference resistance value Rs are provided, and an operation signal So corresponding to each switch operation is output to the CPU 9. .

  The CPU 9 corresponds to a determination unit in the present invention, determines whether the relay 100 is good or bad, and outputs image data Dg to the display unit 7 to display various images. Further, the CPU 9 outputs the control signal Sc1 to the voltage source 2 to output the voltage Vt having the set voltage value, and also outputs the control signal Sc2 to the current source 4 to be set. A current It having a current value is output. Further, the CPU 9 measures the resistance value Rr of the contact portion 102 based on the voltage data Dv output from the voltage detection unit 5 and the current value of the current It output to the current source 4. Furthermore, the CPU 9 executes the determination process 20 shown in FIG. 2 when the operation signal So corresponding to the start switch of the operation unit 8 is output.

  Next, a quality determination method for the relay 100 executed using the board inspection apparatus 1 will be described with reference to the drawings.

  First, the voltage value setting switch of the operation unit 8 is operated to set the voltage value of the voltage Vt so as to match the specification (rated voltage) of the relay 100 to be inspected, and the reference current value setting switch is operated. Reference current values Is1 and Is2 are set. At this time, the CPU 9 specifies the reference current values Is1 and Is2 based on the operation signal So corresponding to the setting content output from the operation unit 8 and stores the reference current values Is1 and Is2 in the storage unit 6. Next, by operating the start switch, the CPU 9 executes the determination process (inspection process) 20 shown in FIG. 2 according to the operation program stored in the storage unit 6.

  In this determination process 20, the CPU 9 first brings the pair of probes P 1 and P 1 into contact with both ends 101 a and 101 b of the coil portion 101, and the pair of probes P 2 and P 2 and the pair of probes P 3 and P 3 on the contact portion 102. It is made to contact both ends 102a and 102b. Thereafter, the CPU 9 causes the voltage source 2 to output the voltage Vt having the voltage value set by outputting the control signal Sc1 (step 21). Thereby, the voltage Vt is supplied to the coil part 101 via a pair of probe P1, P1. At this time, the current detection unit 3 detects the current Id flowing through the coil unit 101 and outputs current data Di. Next, the CPU 9 specifies the current value Im of the current Id based on the current data Di (step 22). Subsequently, the CPU 9 reads the set reference current values Is1 and Is2 from the storage unit 6 (step 23), and determines whether or not the current value Im exceeds the reference current value Is1 (step 24). In this case, when the relay 100 having the specification to be mounted (that is, the relay 100 having a rated voltage equal to the voltage value of the voltage Vt) is correctly mounted on the circuit board 200 (for example, 12V with respect to the voltage Vt of 12V). When the rated voltage relay 100 is mounted on the circuit board 200), the current value Im is equal to or less than the reference current value Is1. When the current value Im is equal to or less than the reference current value Is1, the CPU 9 determines whether or not the current value Im is less than the reference current value Is2 (step 25). In this case, when the relay 100 having the specification to be mounted is mounted on the circuit board 200, the current value Im becomes equal to or higher than the reference current value Is2. When the current value Im is equal to or greater than the reference current value Is2, the CPU 9 outputs a control signal Sc2 to the current source 4 to output a current It having a set current value (step 26). Thereby, the current It is supplied to the contact portion 102 via the pair of probes P2 and P2. At this time, the voltage detection unit 5 detects the voltage Vd between both ends 102a and 102b of the contact unit 102 via the pair of probes P3 and P3, and outputs voltage data Dv. Next, the CPU 9 calculates a resistance value Rr of the contact portion 102 based on the voltage data Dv and the current value of the current It (step 27).

  Next, the CPU 9 reads the reference resistance value Rs set by the operation signal So from the storage unit 6 (step 28), and determines whether or not the resistance value Rr exceeds the reference resistance value Rs (step 29). In this case, when the relay 100 is operating normally, the contact portion 102 is in a contact state, and the resistance value Rr becomes equal to or less than the reference resistance value Rs. When the resistance value Rr is equal to or less than the reference resistance value Rs, the CPU 9 determines that the relay 100 is a non-defective product (step 30). Next, the CPU 9 outputs the image data Dg to the display unit 7 and displays the resistance value Rr together with, for example, “good” indicating the determination result (step 31). When the contact of the contact portion 102 is insufficient even when the relay 100 is determined to be a non-defective product, the resistance value Rr is, for example, several hundred mΩ larger than the resistance value of 10 mΩ when the contact is sufficient. There may be a resistance value of about. Therefore, the user can recognize that the contact portion 102 is insufficiently contacted (the relay 100 is becoming defective) by checking the displayed resistance value Rr. In step 29, when the relay 100 is out of order, the contact 102 is in a non-contact state, and the resistance value Rr is larger than the reference resistance value Rs. At this time, the CPU 9 determines that the relay 100 is defective (step 32), outputs the image data Dg to the display unit 7, and displays, for example, “defective” characters indicating the determination result (step 33). ).

  On the other hand, when the relay 100 having a rated voltage lower than the rated voltage to be mounted in step 24 (that is, the relay 100 having a rated voltage lower than the voltage value of the voltage Vt) is mounted on the circuit board 200 (for example, When the relay 100 having a rated voltage of 5V with respect to the voltage Vt of 12V is erroneously mounted on the circuit board 200), since the coil resistance value Rm of the coil portion 101 is small, the current value Im exceeds the reference current value Is1. It becomes. At this time, the CPU 9 stops the output of the control signal Sc1 to the voltage source 2 and immediately stops the output of the voltage Vt (step 34), and the relay 100 having a different specification (rated voltage) is connected to the circuit board 200. It is determined that it is mounted incorrectly (mounting failure) (step 35). Subsequently, the CPU 9 outputs the image data Dg to the display unit 7 to display, for example, “Mounting failure” characters indicating the determination result (Step 36).

  In step 25, when the relay 100 having a rated voltage higher than the rated voltage to be mounted (that is, the relay 100 having a rated voltage higher than the voltage value of the voltage Vt) is mounted on the circuit board 200 (for example, When the relay 100 having a rated voltage of 24V with respect to the voltage Vt of 12V is erroneously mounted on the circuit board 200), since the coil resistance value Rm of the coil portion 101 is large, the current value Im becomes less than the reference current value Is2. . At this time, the CPU 9 stops the output of the control signal Sc1 to the voltage source 2 and immediately stops the output of the voltage Vt (step 37), and the relay 100 having a different specification (rated voltage) is connected to the circuit board 200. It is determined that it is mounted incorrectly (mounting failure) (step 38). Subsequently, the CPU 9 outputs the image data Dg to the display unit 7 to display, for example, “Mounting failure” characters indicating the determination result (Step 36). Thus, the determination process 20 ends.

  Thus, according to this board inspection apparatus 1, the CPU 9 compares the current value Im of the current Id flowing through the coil unit 101 with the reference current values Is1, Is2, and mounts the relay 100 based on the comparison result. By determining that it is defective, it is possible to reliably inspect the erroneous mounting of the relay 100 having different specifications.

  Further, according to the board inspection apparatus 1, the CPU 9 determines that the mounting of the relay 100 is defective when the current value Im of the current Id exceeds the reference current value Is1, and thus the relay 100 to be mounted. In addition, it is possible to reliably inspect erroneous mounting of the relay 100 having a low rated voltage.

  Further, according to the board inspection apparatus 1, the CPU 9 determines that the mounting of the relay 100 is defective when the current value Im of the current Id is lower than the reference current value Is2, and thus the relay 100 to be mounted. In addition, the erroneous mounting of the relay 100 having a high rated voltage can be reliably inspected.

  Further, according to the board inspection apparatus 1, the CPU 9 relays when the current value Im of the current Id is in the range of the reference current value Is1 or less and the reference current value Is2 or less and the resistance value Rr is the reference resistance value Rs or less. By determining that 100 is a non-defective product, the quality of the relay 100 itself can be reliably inspected.

  In addition, this invention is not limited to said structure. For example, with respect to the current detection unit that detects the current Id flowing through the coil unit 101, the current Id having a current value exceeding the reference current value Is1 flows or the current Id having a current value lower than the reference current value Is2 flows. It can also be composed of a comparator (comparator) that detects the presence. In addition, the configuration in which the voltage value of the voltage Vt is set by the various setting switches at the time of inspection has been described. Prior to the inspection, the voltage value of the voltage Vt, the reference current values Is1, Is2, the current value of the current It, and the reference resistance value Rs are set. The CPU 9 stores in advance the specifications of the relay to be inspected (for example, the rated voltage) in the operation unit 8 or is incorporated in the operation program of the CPU 9 in advance, so that the CPU 9 can relay the relay to be inspected. It is also possible to adopt a configuration in which the voltage value of the voltage Vt is set so as to conform to the 100 specifications and the inspection based on the reference current values Is1 and Is2 is automatically performed. Further, when the voltage Vt is supplied to the coil unit 101 of the relay 100 with respect to the CPU 9, the detected current value Im of the current Id is within the range of the reference current value Is1 and the reference current value Is2. The relay 100 is determined to be defective when the resistance value Rr exceeds the reference resistance value Rs, and the relay 100 is determined to be defective even when the current value Im exceeds the reference current value Is1 or less than the reference current value Is2. It can also be judged.

1 is a block diagram showing a configuration of a substrate inspection apparatus 1. FIG. It is a flowchart of the determination process 20 performed by CPU9 of the board | substrate inspection apparatus 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board inspection device 2 Voltage source 3 Current detection part 9 CPU
DESCRIPTION OF SYMBOLS 100 Relay 101 Coil part 102 Contact part 200 Circuit board Id Current Im Current value Is1, Is2 Reference current value Rr Resistance value Rs Reference resistance value Vt Voltage

Claims (5)

  A power supply unit that supplies a voltage to a coil unit of a relay to be inspected mounted on a circuit board; a current detection unit that detects a current flowing through the coil unit when the voltage is supplied to the coil unit; A relay inspection apparatus comprising: a determination unit that compares a current value of a detected current with a predetermined reference current value and determines that the inspection target relay is mounted poorly based on the comparison result.   The relay inspection according to claim 1, wherein the determination unit determines that mounting of the inspection target relay is defective when a current value of the detected current exceeds an upper limit current value defined in advance as the reference current value. apparatus.   3. The determination unit according to claim 1, wherein when the current value of the detected current is lower than a lower limit current value defined in advance as the reference current value, the inspection target relay is determined to be defective. Relay inspection device.   A resistance value detection unit that detects a resistance value between a pair of contact portions of the relay to be inspected, and the determination unit is a current value of the detected current when the voltage is supplied to the coil unit. Is in the range of the upper limit current value and the lower limit current value respectively defined as the reference current values, and the inspected relay is determined to be non-defective when the detected resistance value is equal to or less than the predetermined reference resistance value. The relay inspection apparatus according to claim 1.   A board inspection apparatus comprising the relay inspection apparatus according to claim 1.

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