JP5687943B2 - Short-circuit inspection apparatus and short-circuit inspection method - Google Patents

Description

  The present invention relates to a short-circuit inspection apparatus and a short-circuit inspection method for inspecting the presence or absence of a short circuit between a plurality of branch wirings extending in a branch shape from a trunk wiring formed on a circuit board.

  As this type of short circuit inspection apparatus, a short circuit inspection apparatus (circuit wiring inspection apparatus) disclosed in Japanese Patent Application Laid-Open No. 2005-300240 is known. This short-circuit inspection apparatus inspects a circuit wiring including a trunk wiring and a plurality of branch wirings extending (extracted) from the trunk wiring in a branch shape, each of which has two end points. A target inspection apparatus, between two end points on the first branch wiring side and between two end points on the second branch wiring side of a pair of adjacent branch wirings (first branch wiring and second branch wiring) Check for short circuit between the two. In addition, in order to enable this short-circuit inspection to be performed, this inspection apparatus is provided between one end point located on the side opposite to the trunk wiring of the first branch wiring and the third branch wiring other than the pair of branch wirings. Measured with a current generator for supplying a test signal (current) to the voltage measuring device, a voltage measuring device connected between two end points on the second branch wiring side, a current supply state from the current generator and a voltage measuring device Control means for determining the presence or absence of a short circuit based on the voltage.

  In the above circuit wiring, when the current is supplied from the current generator and the reading value of the voltage measuring device is 0 V, the end point on the side opposite to the trunk wiring of the first branch wiring → the end point on the trunk wiring side → the trunk wiring → Current flows to the third branch wiring, but current does not flow between the end points on the trunk wiring side and the opposite trunk wiring side of the second branch wiring. Therefore, in this state, in this short-circuit inspection apparatus, the control means determines the distance between the end points on the first branch wiring side based on the current supply state from the current generator and the reading value of the voltage measuring device. It is determined that there is no short circuit between the end points on the second branch wiring side.

  On the other hand, in the above circuit wiring, when a current is supplied from the current generator and the reading value of the voltage measuring device is not 0 V, there is a short-circuit portion between the first branch wiring and the second branch wiring. This is a state in which current flows between the end points of the second branch wiring from the one branch wiring side. This short-circuit current flows in the order of the first branch wiring → the second branch wiring → the trunk wiring → the third branch wiring. Therefore, in this state, in this short-circuit inspection apparatus, the control means determines the distance between the end points on the first branch wiring side based on the current supply state from the current generator and the reading value of the voltage measuring device. It is determined that there is a short circuit between the end points on the second branch wiring side. Thereby, the presence or absence of a short circuit between a pair of adjacent branch wirings among the plurality of branch wirings is inspected.

Japanese Patent Laying-Open No. 2005-300240 (page 6-9, FIG. 2)

  However, the following short circuit inspection apparatus has the following problems to be improved. That is, in this short-circuit inspection apparatus, a pair of branch wirings (first wirings) to be inspected are defined for the first and second branch wirings by defining two end points, that is, an end point on the anti-trunk wiring side and an end point on the trunk wiring side. The voltage measuring device is connected between two end points on the second branch wiring side of the first and second branch wirings). For this reason, the short-circuit inspection apparatus includes a portion between the end point on the trunk wiring side in the first branch wiring and the trunk wiring of the pair of branch wirings, and the second branch wiring of the pair of branch wirings. When a short circuit exists between both parts between the end point on the main wiring side and the main wiring, there is a problem to be improved that it is difficult to inspect the presence or absence of the short circuit.

  This invention is made | formed in view of this subject, and it aims at providing the short circuit inspection apparatus and short circuit inspection method which can test | inspect the short circuit between a pair of branch wiring reliably.

In order to achieve the above object, the short-circuit inspection apparatus according to claim 1, wherein any pair of adjacent branch wirings adjacent to a circuit board on which a plurality of branch wirings extending in a branch shape from the trunk wiring are formed. A short-circuit inspection apparatus for inspecting whether or not there is a short circuit between the inspection branch wirings by using each branch wiring as an inspection branch wiring, wherein the branch wiring is located on at least one of the pair of inspection branch wirings Is defined as an auxiliary branch wiring, and a set of current supply branch wirings is configured by using an arbitrary pair of branch wirings of the pair of inspection branch wirings and auxiliary branch wirings as a set of current supply branch wirings. A set of a current supply unit for supplying a test current from a probing point formed on the front end side of each branch wiring, and an arbitrary pair of branch wirings of the pair of test branch wirings and the auxiliary branch wirings. The current supply branch A pair of branch wirings having at least one branch wiring different from the pair of lines is defined as a voltage measurement branch wiring set, and probing points respectively defined on the leading ends of the branch wirings constituting the voltage measurement branch wiring set A voltage measuring unit that measures a voltage between wirings generated between the pair of test branch wirings, and the predetermined voltage based on the voltage between the wirings measured when the test current is supplied in a state where there is no short circuit between the pair of test branch wirings Measured by the voltage measuring unit in a state in which the inspection current is supplied from the current supply unit to the set of current supply branch wirings from a storage unit that stores a determination range for electrical parameters based on the voltage between the wires A processing unit for inspecting the presence or absence of the short circuit between the pair of inspection branch wirings by comparing the electrical parameter based on the voltage between the wirings and the determination range; There.

The short-circuit inspection device according to claim 2 is the short-circuit inspection device according to claim 1, wherein the voltage measurement is performed when a pair of branch wirings positioned on both sides of the pair of inspection branch wirings are defined as the auxiliary branch wirings. parts are a pair of said pair of test branch wiring and the pair of auxiliary branch wiring with any different that a pair of branch lines of the branch line that make up the set of current supply branch line of all branch wiring The voltage between the wirings is measured as a set of the voltage measuring branch wirings.

  The short-circuit inspection apparatus according to claim 3, wherein the pair of current supply branch wirings is one inspection branch wiring and the pair of auxiliary branch wirings of the pair of inspection branch wirings. Of the test branch wirings, and the set of voltage measurement branch wirings includes the other test branch wiring of the pair of test branch wirings and the pair of auxiliary branch wirings. The auxiliary branch wiring on the other inspection branch wiring side.

According to a fourth aspect of the present invention, in the short-circuit inspection device according to the first aspect, the one branch wiring adjacent to one of the pair of inspection branch wirings is defined as an auxiliary branch wiring. In some cases, the voltage measuring unit is a pair of any pair of branch wirings among all the branch wirings of the pair of test branch wirings and the auxiliary branch wirings, The voltage between the wirings is measured by using a pair of branch wirings having different branch wirings as a set of voltage measurement branch wirings.

In order to achieve the above object, the short-circuit inspection method according to claim 5 is configured such that any pair of adjacent branch wirings adjacent to a circuit board on which a plurality of branch wirings extending in a branch shape from the trunk wiring are formed. A short circuit inspection method for inspecting the presence or absence of a short circuit between the inspection branch wirings using each branch wiring as an inspection branch wiring, wherein the branch wirings are located on at least one inspection branch wiring side of the pair of inspection branch wirings Is defined as an auxiliary branch wiring, and a set of current supply branch wirings is configured by using an arbitrary pair of branch wirings of the pair of inspection branch wirings and auxiliary branch wirings as a set of current supply branch wirings. A test current is supplied from a probing point formed on the tip side of each branch wiring, and a set of any pair of branch wirings of the pair of test branch wirings and the auxiliary branch wirings, the current supply A set of branch wiring and a small A pair of branch wirings having different branch wirings is used as a set of voltage measurement branch wirings, and is generated between the probing points respectively defined on the front ends of the branch wirings constituting the voltage measurement branch wiring set. An electrical parameter based on the inter-wiring voltage defined in advance based on the inter-wiring voltage measured when the inspection current is supplied in the absence of the short circuit between the pair of inspection branch wirings Is compared with the electrical parameter based on the measured inter-wiring voltage, and the presence or absence of the short circuit between the pair of inspection branch wirings is inspected.

  The short-circuit inspection apparatus according to claim 1 and the short-circuit inspection method according to claim 5, wherein when a short-circuit inspection is performed as an inspection branch wiring of a pair of adjacent branch wirings among a plurality of branch wirings, the tip of each branch wiring The current supply unit and the voltage measurement unit are connected using the probing points respectively formed on the units. Therefore, according to the short-circuit inspection apparatus and the short-circuit inspection method, the entire region between the pair of branch wirings as the pair of inspection branch wirings, that is, in the extending direction of one branch wiring of the pair of branch wirings. The presence or absence of occurrence of a short circuit can be reliably inspected between the entire area along the line and the entire area along the extending direction of the other branch wiring.

According to a second aspect of the present invention, a pair of branch wirings located on both sides of the pair of inspection branch wirings are defined as auxiliary branch wirings, and a set of current supply branch wirings to which a current supply unit is connected is configured. A pair of branch wirings different from any of the branch wirings is a set of voltage measurement branch wirings to which the voltage measurement unit is connected. Therefore, according to this short-circuit inspection device, each probing point can be configured to contact the probe of the current supply unit and the voltage measurement unit one by one, so that each branch wiring is formed at a narrow pitch, Even when the pitch between probing points is narrow, unlike the configuration in which two probes are in contact with one land, the probe can be surely brought into contact with the land. It is possible to reliably execute a short-circuit inspection for.

  Further, in the short circuit inspection apparatus according to claim 3, the set of current supply branch wirings includes one inspection branch wiring of the pair of inspection branch wirings and one inspection branch wiring side of the pair of auxiliary branch wirings. A set of voltage measurement branch wirings is composed of an auxiliary branch wiring on the other test branch wiring side of the pair of auxiliary branch wirings and the other test branch wiring of the pair of test branch wirings. Has been. Therefore, according to this short-circuit inspection device, when the pair of inspection branch wirings are not short-circuited, the voltage path for the inter-wiring voltage detected by the voltage measurement unit is the current path for the inspection current supplied from the current supply unit. A configuration in which there is no common path between the voltage path and the current path (a configuration in which there is no common path), and a configuration in which the voltage path overlaps the current path when the pair of test branch wirings are short-circuited (the voltage path and the current path) In which a common path exists between the two. Therefore, according to this short circuit inspection device, the voltage between the wirings measured by the voltage measuring unit is set to zero volts when the pair of inspection branch wirings are not short-circuited, and is not zero volts when the pair of inspection branch wirings are short-circuited. Since the voltage can be set, the determination range can be easily set.

  According to the short circuit inspection apparatus of claim 4, the branch wirings positioned at both ends of the plurality of branch wirings extending in a branch shape from the trunk wiring are also connected to the adjacent branch wiring as the inspection branch wiring. The presence or absence of a short circuit can be inspected.

1 is a configuration diagram showing a configuration of a short-circuit inspection device 1. FIG. FIG. 6 is a connection diagram illustrating a connection state of the current supply unit 2 and the voltage measurement unit 3 to each branch wiring 11 to 14 when the branch wirings 12 and 13 are inspection branch wirings. FIG. 6 is a connection diagram illustrating a connection state of the current supply unit 2 and the voltage measurement unit 3 to each branch wiring 13 to 16 when the branch wirings 14 and 15 are inspection branch wirings. It is a connection diagram which shows the other connection state of the current supply part 2 and the voltage measurement part 3 to each branch wiring 11-14 when the branch wirings 12 and 13 are test | inspection branch wiring. It is a connection diagram which shows the other connection state of the current supply part 2 and the voltage measurement part 3 to each branch wiring 11-14 when the branch wirings 12 and 13 are test | inspection branch wiring. It is a block diagram which shows the structure of 1 A of short circuit inspection apparatuses. It is a connection diagram which shows the other connection state of the current supply part 2 and the voltage measurement part 3 to each branch wiring 12-14 when the branch wirings 12 and 13 are test | inspection branch wiring.

  Hereinafter, embodiments of a short-circuit inspection apparatus and a short-circuit inspection method will be described with reference to the accompanying drawings.

  Initially, the structure of the short circuit inspection apparatus 1 is demonstrated with reference to drawings.

  As shown in FIG. 1, the short circuit inspection apparatus 1 includes a current supply unit 2, a voltage measurement unit 3, a storage unit 4, a processing unit 5, and a display unit 6, and one side of the trunk wiring M (right side in the figure). Branches at both ends with respect to a circuit board (not shown) on which a plurality of (six as an example in this example) branch wirings 11, 12, 13, 14, 15, 16 are formed in a branch shape. An arbitrary pair of adjacent branch wirings among the branch wirings 12 to 15 excluding the wirings 11 and 16 are used as inspection branch wirings, and a pair of branch wirings located on both sides of the pair of branch wirings as inspection branch wirings. As auxiliary branch wiring, the presence or absence of a short circuit between each inspection branch wiring is inspected. Further, the short-circuit inspection apparatus 1 has the lands 21, 22, 23, 24, and 25 formed at the tip portions of the branch wirings 11, 12, 13, 14, 15, 16 when the pair of branch wirings are inspected. 26 are used as probing points.

  The current supply unit 2 includes, as an example, a current source 2a and a pair of probes (current supply probes) 2b and 2c. The current supply unit 2 is controlled by the processing unit 5 and inspected between the probes 2b and 2c (DC current or AC current). In this example, a direct current (I) is output as an example. The current supply unit 2 outputs current data Di indicating the current value of the test current I to the processing unit 5 when the test current I is being output between the probes 2b and 2c.

  As an example, the voltage measurement unit 3 includes a voltmeter 3a and a pair of probes (voltage detection probes) 3b and 3c, and measures a voltage V between the probes 3b and 3c. Further, the voltage measuring unit 3 outputs voltage data Dv indicating the voltage value of the measured voltage V to the processing unit 5. The storage unit 4 is composed of, for example, a semiconductor memory such as a ROM or a RAM, or a hard disk device, and is used in an operation program for a later-described CPU constituting the processing unit 5 or a later-described short-circuit inspection process by the processing unit 5. Determination data Dref indicating the determination range to be performed is stored in advance.

  As an example, the processing unit 5 is configured using a CPU, and performs operation control on the current supply unit 2, a short circuit inspection process, and a display process on the result of the short circuit inspection process. The display unit 6 includes a display device such as an LCD as an example, and displays the result of the short circuit inspection process on the screen.

  Next, a short-circuit inspection method for the branch wirings 12 to 15 using the short-circuit inspection apparatus 1 will be described with reference to the drawings, together with the operation of the short-circuit inspection apparatus 1.

  Note that there are three pairs of branch wirings 12 and 13, branch wirings 13 and 14, and branch wirings 14 and 15 as a pair of adjacent branch wirings among the branch wirings 12 to 15 serving as inspection branch wirings. A pair of branch wirings that serve as auxiliary branch wirings for each set is defined in advance as follows.

  When the pair of branch wirings 12 and 13 are inspection branch wirings, the branch wiring 11 located on one side of the branch wirings 12 and 13 and the branch wirings 14 to 16 located on the other side of the branch wirings 12 and 13 Is defined as a pair of branch wirings as auxiliary branch wirings located on both sides of the branch wirings 12 and 13. When the pair of branch wirings 13 and 14 are inspection branch wirings, any one of the branch wirings 11 and 12 located on one side of the branch wirings 13 and 14 (for example, the branch wiring 12) and Any one branch wiring (for example, branch wiring 15) of the branch wirings 15 and 16 positioned on the other side of the branch wirings 12 and 13 is an auxiliary branch wiring positioned on both sides of the branch wirings 13 and 14. As a pair of branch lines. Further, when the pair of branch wirings 14 and 15 are inspection branch wirings, any one of the branch wirings 11 to 13 located on one side of the branch wirings 14 and 15 (for example, the branch wiring 13) and The branch wirings 16 located on the other side of the branch wirings 14 and 15 are defined as a pair of branch wirings as auxiliary branch wirings located on both sides of the branch wirings 14 and 15.

  Next, a current is supplied to any pair of branch wirings among the pair of inspection branch wirings and all branch wirings (four branch wirings) of the pair of auxiliary branch wirings defined for the pair of inspection branch wirings. A pair of branch wirings connected to the current supply unit 2 as a pair of branch wirings and different from any of the pair of current supply branch wirings among all the branch wirings of the pair of test branch wirings and the pair of auxiliary branch wirings The voltage measurement unit 3 is connected with the (set of the remaining two branch lines) as a set of voltage measurement branch lines.

  Specifically, when the pair of branch wirings 12 and 13 are inspection branch wirings and the pair of branch wirings 11 and 14 are auxiliary branch wirings, as an example, as shown in FIG. The pair of branch wirings 13 and 14 out of 11 to 14 is set as a set of current supply branch wirings, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 23 and 24 of the pair of branch wirings 13 and 14, respectively. To do. In addition, a pair of branch wirings 11 and 12 (a pair of the remaining two branch wirings 11 and 12) different from any of the current supply branch wiring sets among the branch wirings 11 to 14 is set as a voltage measurement branch wiring set. The probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 21 and 22 of the pair of branch wirings 11 and 12, respectively. In this case, the current supply unit 2 and the voltage measurement unit 3 can be connected by exchanging each branch wiring constituting the current supply branch wiring set and each branch wiring constituting the voltage measurement branch wiring set.

  When the pair of branch wirings 13 and 14 are inspection branch wirings and the pair of branch wirings 12 and 15 are auxiliary branch wirings, as shown in FIG. 1, as an example, these four branch wirings 12 to 15 are used. The pair of branch wirings 14 and 15 is a set of current supply branch wirings, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 24 and 25, respectively. Further, the remaining pair of branch lines 12 and 13 is set as a set of voltage measurement branch lines, and the probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 22 and 23, respectively. In this case, the current supply unit 2 and the voltage measurement unit 3 can be connected by exchanging each branch wiring constituting the current supply branch wiring set and each branch wiring constituting the voltage measurement branch wiring set.

  When the pair of branch wirings 14 and 15 are inspection branch wirings and the pair of branch wirings 13 and 16 are auxiliary branch wirings, as shown in FIG. 3, as an example, these four branch wirings 13 to 16 are used. The pair of branch wires 15 and 16 is set as a set of current supply branch wires, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 25 and 26, respectively. Further, the remaining pair of branch lines 13 and 14 is set as a set of voltage measurement branch lines, and the probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 23 and 24, respectively. In this case, the current supply unit 2 and the voltage measurement unit 3 can be connected by exchanging each branch wiring constituting the current supply branch wiring set and each branch wiring constituting the voltage measurement branch wiring set.

  Connection of the current supply unit 2 to one set of current supply branch lines thus defined and connection of the voltage measurement unit 3 to one set of voltage measurement branch lines corresponding to the set of current supply branch lines In the short circuit inspection apparatus 1, the processing unit 5 causes the current supply unit 2 to start supplying the inspection current I between a pair of branch wirings as a set of current supply branch wirings, Current data Di indicating the current value of the inspection current I is input from the supply unit 2.

  When the current value of the inspection current I indicated by the input current data Di is not zero, the processing unit 5 determines that the inspection current I is normally supplied from the current supply unit 2 to the set of current supply branch lines. Then, the short circuit inspection process is executed. In this short-circuit inspection process, the processing unit 5 receives the voltage data Dv from the voltage measurement unit 3, and receives determination data Dref corresponding to the current set of voltage measurement branch wires and the set of current supply branch wires from the storage unit 4. Read and compare the voltage value of the voltage V indicated by the voltage data Dv (inter-wiring voltage generated between a pair of branch wirings as a set of voltage measurement branch wirings) with the determination range indicated by the determination data Dref.

  As an example, as shown in FIG. 1, a pair of branch wirings 13 and 14 are defined as inspection branch wirings, a pair of branch wirings 12 and 15 are defined as auxiliary branch wirings, and a pair of branch wirings 14 and 15 is further defined. An example will be described in which a set of current supply branch wirings and a pair of the remaining pair of branch wirings 12 and 13 are set as voltage measurement branch wirings. In this example, when the branch lines 13 and 14 as the inspection branch lines are not short-circuited (when the short-circuit pattern SC does not exist), a set of current supply branch lines (branch lines) from the current supply unit 2 14 and 15) is supplied to a current path (a path from the land 24 to the land 25 via the branch wiring 14, the trunk wiring M, and the branch wiring 15) indicated by a solid line in FIG. Although there is a common path between the current path and the voltage path to which the voltage measuring unit 3 is connected (the path from the land 22 to the land 23 via the branch wiring 12, the trunk wiring M, and the branch wiring 13). Since it does not exist, the inspection current I does not flow through this voltage path. As a result, the voltage value of the voltage V measured by the voltage measuring unit 3 becomes zero volts, and voltage data Dv indicating this voltage value is input to the processing unit 5.

  On the other hand, when the branch wirings 13 and 14 as the inspection branch wiring are short-circuited (when the short-circuit pattern SC exists), the above-described current path (current path indicated by a solid line in FIG. 1). In addition, another new current path indicated by a broken line in the figure (from the land 24 to the land 25 via the branch wiring 14, the short-circuit pattern SC, a part of the branch wiring 13, the trunk wiring M and the branch wiring 15) Route) is formed. A part of the branch wiring 13 exists as a common path between the other current path and the voltage path described above. For this reason, in this common path (a part of the branch wiring 13), a voltage drop occurs due to a part of the inspection current I flowing, and the voltage value of the voltage V measured by the voltage measuring unit 3 is zero volts. The voltage data Dv indicating this voltage value is input to the processing unit 5.

  Therefore, the voltage value (zero volt in this example) indicated by the voltage data Dv when the branch wirings 13 and 14 as the inspection branch wiring are not short-circuited (when the branch wirings 13 and 14 are in a normal state). , And a voltage value (a voltage value that is not zero volts) indicated by voltage data Dv when the branch wirings 13 and 14 are short-circuited (when the branch wirings 13 and 14 are defective). ) Based on the electrical parameter (in this example, this voltage value itself is this electrical parameter), the voltage value indicated by the voltage data Dv when the branch wirings 13 and 14 are not short-circuited is included. A determination range that does not include the voltage value indicated by the voltage data Dv when the branch wirings 13 and 14 are short-circuited is determined as an example and stored in the storage unit 4 as determination data Dref. Thereby, the processing unit 5 compares the determination range indicated by the determination data Dref read from the storage unit 4 with the voltage value of the voltage V, and when the voltage value of the voltage V is included in the determination range, When it is determined that the branch lines 13 and 14 are not short-circuited (no short-circuit pattern is present) and the voltage V is not included in the determination range, the branch lines 13 and 14 are short-circuited. It is determined that there is a short circuit pattern SC. Thereby, the short circuit inspection process is completed.

  The voltage value indicated by the voltage data Dv when the branch lines 13 and 14 are not short-circuited is not included, and the voltage value indicated by the voltage data Dv when the branch lines 13 and 14 are short-circuited. It is also possible to determine determination data Dref by determining a determination range to be included. In this case, the processing unit 5 compares the determination range indicated by the determination data Dref read from the storage unit 4 with the voltage value of the voltage V. When the voltage value of the voltage V is not included in the determination range, When it is determined that the branch lines 13 and 14 are not short-circuited (no short-circuit pattern is present) and the voltage value V is included in the determination range, the branch lines 13 and 14 are short-circuited. It is determined that there is a short circuit pattern SC.

  Finally, the processing unit 5 executes display processing and causes the display unit 6 to display the result of the short circuit inspection processing. As a result, the short circuit inspection for each branch wiring 13 and 14 as the inspection branch wiring is completed. In the short circuit inspection apparatus 1, the other pair of branch wirings are used as the inspection branch wirings, and as shown in FIGS. 2 and 3, the current supply unit 2 is connected to the corresponding set of current supply branch wirings, and the voltage measurement unit 3 The processing unit 5 operates as described above to execute the short circuit inspection process and display the result of the short circuit inspection process on the display unit 6 every time it is connected to the corresponding voltage measurement branch wiring set. Therefore, in this short circuit inspection apparatus 1, by confirming the contents displayed on the display unit 6, between the pair of branch wirings (between the branch wirings 12 and 13, between the branch wirings 13 and 14, and the branch wiring) (Between 14 and 15), it is possible to inspect whether or not a short circuit has occurred.

  Thus, in this short circuit inspection apparatus 1 and the short circuit inspection method, each of the branch wirings 11 to 16 is subjected to a short circuit inspection when any pair of adjacent branch wirings among the plurality of branch wirings 12 to 15 is used as the inspection branch wiring. The current supply unit 2 and the voltage measurement unit 3 are connected using the lands 21 to 26 respectively formed at the front end portions as the probing points. Therefore, according to the short-circuit inspection apparatus 1 and the short-circuit inspection method, the extending direction in one branch wiring of the pair of branch wirings extends over the entire area between the pair of branch wirings as the pair of inspection branch wirings. It is possible to reliably inspect the occurrence of a short circuit between the entire area along the line and the entire area along the extending direction of the other branch wiring.

Further, in this short circuit inspection apparatus 1, a pair of branch wirings positioned on both sides of a pair of inspection branch wirings are defined as auxiliary branch wirings (as shown in FIG. 1, for a pair of inspection branch wirings 13 and 14, A pair of branch wirings (in this example, branch wirings 12 and 15 are defined as auxiliary branch wirings) located on both sides thereof, and branch wirings 14 constituting a set of current supply branch wirings to which the current supply unit 2 is connected. , 15 is a set of a pair of branch wirings 12 and 13, which is a set of voltage measurement branch wirings to which the voltage measuring unit 3 is connected. Therefore, according to this short circuit inspection apparatus 1, since it can be set as the structure which contacts each land 22-25 one by one, each branch wiring 11-16 is formed with a narrow pitch, and each land 21 Unlike the configuration in which two probes are in contact with one land even if the pitch between .about.26 is narrow, each branch wiring formed with a narrow pitch can be obtained as a result of the probe being able to contact the land with certainty. The short circuit inspection for 12 to 15 can be reliably executed.

  In the short circuit inspection apparatus 1, the current supply branch wiring set includes one inspection branch wiring 14 of the pair of inspection branch wirings 13 and 14 and one inspection of the pair of auxiliary branch wirings 12 and 15. The auxiliary branch wiring 15 on the side of the branch wiring 14 is composed of a voltage measurement branch wiring of the other inspection branch wiring 13 and the pair of auxiliary branch wirings 12 and 15 of the pair of inspection branch wirings 13 and 14. This is composed of the auxiliary branch wiring 12 on the other inspection branch wiring 13 side. Therefore, according to this short circuit inspection apparatus 1, when the pair of inspection branch wires 13 and 14 are not short-circuited, the inspection current supplied from the current supply unit 2 is the voltage path for the voltage V detected by the voltage measurement unit 3. The current path for I is not overlapped at all (a configuration in which there is no common path between the voltage path and the current path), and when the pair of test branch wires 13 and 14 are short-circuited, the voltage path becomes the current path. An overlapping configuration (a configuration in which a common path exists between the voltage path and the current path) can be employed. Therefore, according to this short circuit inspection apparatus 1, the voltage V measured by the voltage measuring unit 3 is set to zero volts when the pair of inspection branch lines 13 and 14 are not short-circuited, and the pair of inspection branch lines 13 and 14 Since the voltage can be set to a voltage other than zero volts when short-circuited, the determination range can be easily set.

  In addition, it is not limited to said structure. For example, in a configuration in which a pair of branch wirings positioned on both sides of a pair of test branch wirings are defined as auxiliary branch wirings, as shown in FIG. A set of measurement branch lines (in the figure, a set of current supply branch lines is taken as an example), and a pair of auxiliary branch lines 11 and 14 positioned on both sides of the pair of test branch lines 12 and 13 is set as a set of current supply branch lines and a voltage. It is also possible to adopt a configuration in which the remaining set of measurement branch wiring sets (in the figure, a set of voltage measurement branch wirings as an example). Further, as shown in FIG. 5, the probes 2 b and 2 c of the current supply unit 2 and the probes 3 b and 3 c of the voltage measuring unit 3 with respect to the lands 21, 22, 23 and 24 of the branch wirings 11, 12, 13 and 14. Are connected alternately (in this example, the probe 3b, probe 2b, probe 3c, and probe 2c are connected in this order from the land 21 side) and the current supply branch wiring set and the voltage measurement branch wiring. It is also possible to adopt a configuration that defines a set of

  4 and 5, the voltage path for the voltage measurement unit 3 and the current path for the current supply unit 2 are always set regardless of whether or not the pair of test branch wires 12 and 13 are short-circuited. In some cases, they overlap (a common path exists). However, in any of the configurations shown in FIGS. 4 and 5, the voltage V measured by the voltage measuring unit 3 is different between when the pair of test branch wires 12 and 13 are short-circuited and when they are not short-circuited. To do. For this reason, by defining the determination range in advance so as to distinguish the difference in the voltage V depending on the presence or absence of this short circuit, the tip of each branch wiring 11 to 14 can be used in any of the configurations shown in FIGS. Each of the lands 21 to 24 formed in each part is used as a probing point to inspect whether there is a short circuit between a pair of adjacent branch wirings (between a pair of inspection branch wirings 12 and 13 as an example in each figure). And the same effects as those of the short circuit inspection apparatus 1 described above can be obtained.

  In addition, the example in which the pair of branch wirings positioned on both sides of the pair of test branch wirings is defined as the auxiliary branch wiring has been described above, but one branch wiring adjacent to one test branch wiring side of the pair of test branch wirings. It is also possible to adopt a configuration in which is defined as auxiliary branch wiring. Hereinafter, a short circuit inspection apparatus 1A employing this configuration will be described with reference to FIG.

  First, the configuration of the short circuit inspection apparatus 1A will be described. The short-circuit inspection apparatus 1A and the short-circuit inspection apparatus 1 are the same in the configuration of the apparatus except that the auxiliary branch wirings for the pair of inspection branch wirings are mainly different as described above. For this reason, about the same structure as the short circuit inspection apparatus 1, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  1 A of short circuit inspection apparatuses are equipped with the electric current supply part 2, the voltage measurement part 3, the memory | storage part 4, the process part 5, and the display part 6, and are extended in the branch shape to one side (the right side in the figure) of the trunk wiring M. Of all the branch wires 11 to 15 with respect to a circuit board (not shown) on which a plurality of branch wires 11, 12, 13, 14, 15 are formed (in this example, five are shown as an example). Each of the adjacent branch wirings of each of the inspection branch wirings is used as a test branch wiring, and one of the pair of branch wirings that are used as the test branch wiring is adjacent to one of the test branch wirings as an auxiliary branch wiring. Check for short circuit between branch wires. Similarly to the short-circuit inspection apparatus 1, the short-circuit inspection apparatus 1A uses the probing points for the lands 21, 22, 23, 24, and 25 formed at the tips of the branch wirings 11, 12, 13, 14, and 15, respectively. Use as

  Next, a short circuit inspection method for a plurality of branch lines (each branch line 11 to 15) using the short circuit inspection apparatus 1A will be described together with the operation of the short circuit inspection apparatus 1A.

  As a pair of adjacent branch wirings among the branch wirings 11 to 15 serving as inspection branch wirings, branch wirings 11 and 12, branch wirings 12 and 13, branch wirings 13 and 14, and branch wirings 14 and 15 are included. Although there are four sets, one branch wiring that is an auxiliary branch wiring for each group is defined in advance as follows.

  When the pair of branch wirings 11 and 12 are inspection branch wirings, the branch wiring 13 adjacent to one branch wiring 12 of the branch wirings 11 and 12 is defined as the auxiliary branch wiring. When the pair of branch wirings 12 and 13 are inspection branch wirings, the branch wiring 14 adjacent to one branch wiring 13 of the branch wirings 12 and 13 and the branch wiring 11 adjacent to the other branch wiring 12 are Either (for example, the branch wiring 14) is defined as the auxiliary branch wiring. When the pair of branch wirings 13 and 14 are inspection branch wirings, the branch wiring 15 adjacent to one branch wiring 14 side of the branch wirings 13 and 14 and the branch wiring 12 adjacent to the other branch wiring 13 side are connected. Either (for example, the branch wiring 15) is defined as the auxiliary branch wiring. When the pair of branch wirings 14 and 15 are inspection branch wirings, the branch wiring 13 adjacent to one branch wiring 14 of the branch wirings 14 and 15 is defined as the auxiliary branch wiring.

  Next, an arbitrary pair of branch wirings among a pair of test branch wirings and all branch wirings (three branch wirings) of one auxiliary branch wiring defined for the pair is used as a current supply branch wiring set. In addition to connecting the current supply unit 2, the voltage measurement unit 3 is connected using a pair of branch wires different from one set of current supply branch wires as a set of voltage measurement branch wires.

  For example, when the pair of branch wirings 11 and 12 are inspection branch wirings and the branch wiring 13 is an auxiliary branch wiring, although not shown, as an example, an arbitrary pair of these three branch wirings 11 to 13 is used. A pair of branch wires (for example, branch wires 12 and 13) is used as a set of current supply branch wires, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 22 and 23 of the pair of branch wires 12 and 13, respectively. . In addition, a pair of branch wirings (for example, branch wirings 11 and 13) in which one branch wiring is different from the pair of current supply branch wirings among the branch wirings 11 to 13 is set as a pair of voltage measurement branch wirings. The probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 21 and 23 of the branch wirings 11 and 13, respectively.

  Further, when the pair of branch wirings 12 and 13 are inspection branch wirings and one branch wiring 14 is an auxiliary branch wiring, as shown in FIG. 6, as an example, among these three branch wirings 12 to 14 The pair of branch wires 13 and 14 is set as a set of current supply branch wires, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 23 and 24 of the pair of branch wires 13 and 14, respectively. In addition, a pair of branch wirings (for example, branch wirings 12 and 14) in which one branch wiring is different from the pair of current supply branch wirings among the branch wirings 12 to 14 is set as a pair of voltage measurement branch wirings. The probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 22 and 24 of the branch wirings 12 and 14, respectively.

  Further, when the pair of branch wirings 13 and 14 are inspection branch wirings and one branch wiring 15 is an auxiliary branch wiring, although not shown, as an example, a pair of these three branch wirings 13 to 15 is a pair. A pair of branch wirings 13 and 14 is used as a set of current supply branch wirings, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 23 and 24 of the pair of branch wirings 13 and 14, respectively. In addition, a pair of branch wirings (for example, branch wirings 13 and 15) in which one branch wiring is different from the pair of current supply branch wirings among the branch wirings 13 to 15 is set as a pair of voltage measurement branch wirings. The probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 23 and 25 of the branch wirings 13 and 15, respectively.

  Further, when the pair of branch wirings 14 and 15 are inspection branch wirings and one branch wiring 13 is an auxiliary branch wiring, although not shown, as an example, a pair of these three branch wirings 13 to 15 is a pair. A pair of branch wirings 14 and 15 is used as a set of current supply branch wirings, and the probes 2b and 2c of the current supply unit 2 are connected to the lands 24 and 25 of the pair of branch wirings 14 and 15, respectively. In addition, a pair of branch wirings (for example, branch wirings 13 and 15) in which one branch wiring is different from the pair of current supply branch wirings among the branch wirings 13 to 15 is set as a pair of voltage measurement branch wirings. The probes 3b and 3c of the voltage measuring unit 3 are connected to the lands 23 and 25 of the branch wirings 13 and 15, respectively.

  Connection of the current supply unit 2 to one set of current supply branch lines thus defined and connection of the voltage measurement unit 3 to one set of voltage measurement branch lines corresponding to the set of current supply branch lines In the short circuit inspection apparatus 1, the processing unit 5 causes the current supply unit 2 to start supplying the inspection current I between a pair of branch wirings as a set of current supply branch wirings, Current data Di indicating the current value of the inspection current I is input from the supply unit 2.

  When the current value of the inspection current I indicated by the input current data Di is not zero, the processing unit 5 determines that the inspection current I is normally supplied from the current supply unit 2 to the set of current supply branch lines. Then, the short circuit inspection process is executed. In this short-circuit inspection process, the processing unit 5 receives the voltage data Dv from the voltage measurement unit 3, and receives determination data Dref corresponding to the current set of voltage measurement branch wires and the set of current supply branch wires from the storage unit 4. Read and compare the voltage value of the voltage V (voltage generated between a pair of branch wirings as a set of voltage measurement branch wirings) indicated by the voltage data Dv with the determination range indicated by the determination data Dref.

  As an example, as shown in FIG. 6, a pair of branch wirings 12 and 13 are defined as inspection branch wirings, one branch wiring 14 is defined as an auxiliary branch wiring, and a pair of branch wirings 13 and 14 is further supplied with current. An example in which a pair of branch wirings 12 and 14 is used as a set of voltage measurement branch wirings will be described. In this example, when the branch wires 12 and 13 as the inspection branch wires are not short-circuited (when no short-circuit pattern exists), a set of current supply branch wires (branch wires 13) is supplied from the current supply unit 2. , 14) flows in a current path indicated by a solid line (a path from the land 23 to the land 24 via the branch wiring 13, the trunk wiring M, and the branch wiring 14). . In this example, this current path includes a voltage path (a path from the land 22 to the land 24 via the branch wiring 12, the trunk wiring M, and the branch wiring 14) to which the voltage measuring unit 3 is connected, and the trunk wiring M. A part and the branch wiring 14 overlap (a part of the trunk wiring M and the branch wiring 14 are shared as a common path). Therefore, the voltage measuring unit 3 measures a voltage drop caused by the inspection current I flowing through the common path of the current path and the voltage path as the voltage V, and voltage data Dv indicating the voltage value of the voltage V Is output to the processing unit 5.

  On the other hand, when the branch wirings 12 and 13 serving as the inspection branch wiring are short-circuited (when the short-circuit pattern SC exists), the above-described current path (path indicated by a solid line in FIG. 6). In addition to this, another new current path indicated by a broken line in the figure (from the land 23 to the branch wiring 13, the short-circuit pattern SC, a part of the branch wiring 12, the trunk wiring M and the branch wiring 14 to the land 24) Route) is formed. For this reason, the common path between the current path and the voltage path changes, and the voltage drop caused by the inspection current I flowing through the common path after the change also changes and is output from the voltage measuring unit 3 to the processing unit 5. The voltage value of the voltage V indicated by the voltage data Dv also changes.

  Therefore, the voltage value indicated by the voltage data Dv when the branch wirings 12 and 13 as the inspection branch wiring are not short-circuited (when the branch wirings 12 and 13 are in a normal state), and the branch wiring 12. , 13 are short-circuited (when each branch wiring 12, 13 is in a defective state), based on the voltage value indicated by voltage data Dv, each branch wiring 12, 13 is not short-circuited The determination value Dref is determined by determining a determination range that includes the voltage value indicated by the voltage data Dv and does not include the voltage value indicated by the voltage data Dv when the branch wirings 12 and 13 are short-circuited. Is stored in the storage unit 4 as follows. Thereby, the processing unit 5 compares the determination range indicated by the determination data Dref read from the storage unit 4 with the voltage value of the voltage V, and when the voltage value of the voltage V is included in the determination range, When it is determined that the branch wirings 12 and 13 are not short-circuited (no short-circuit pattern exists) and the voltage value of the voltage V is not included in the determination range, the branch wirings 12 and 13 are short-circuited. It is determined that there is a short circuit pattern SC. Thereby, the short circuit inspection process is completed.

  The voltage value indicated by the voltage data Dv when the branch lines 12 and 13 are not short-circuited is not included, and the voltage value indicated by the voltage data Dv when the branch lines 12 and 13 are short-circuited is not included. It is also possible to determine a determination range that includes “” and use it as the determination data Dref. In this case, the processing unit 5 compares the determination range indicated by the determination data Dref read from the storage unit 4 with the voltage value of the voltage V. When the voltage value of the voltage V is not included in the determination range, When it is determined that the branch wirings 12 and 13 are not short-circuited (no short-circuit pattern exists) and the voltage value of the voltage V is included in the determination range, the branch wirings 12 and 13 are short-circuited. It is determined that there is a short circuit pattern SC.

  Finally, the processing unit 5 executes display processing and causes the display unit 6 to display the result of the short circuit inspection processing. Thereby, the short circuit inspection for each branch wiring 12 and 13 as the inspection branch wiring is completed. In the short-circuit inspection apparatus 1A, the other pair of branch wirings are used as inspection branch wirings, the current supply unit 2 is connected to the corresponding set of current supply branch wirings, and the voltage measurement unit 3 is connected to the corresponding voltage measurement branch wiring set. Each time the connection is made, the processing unit 5 operates as described above to execute the short circuit inspection process, and display the result of the short circuit inspection process on the display unit 6. Therefore, also in this short circuit inspection apparatus 1A, in the same manner as the short circuit inspection apparatus 1, by confirming the contents displayed on the display unit 6, whether or not a short circuit has occurred between the pair of branch wirings as the inspection branch wirings. It is possible to inspect.

  Thus, also in this short circuit inspection apparatus 1A, when performing a short circuit inspection as an inspection branch wiring of any pair of adjacent branch wirings among the plurality of branch wirings 11 to 15, the tip portions of the respective branch wirings 11 to 15 The current supply unit 2 and the voltage measurement unit 3 are connected by using the lands 21 to 25 respectively formed as the probing points. Therefore, according to this short circuit inspection apparatus 1A, as in the case of the short circuit inspection apparatus 1, any position along the extending direction in one branch wiring of the pair of branch wirings as the inspection branch wiring and the other Even if a short circuit occurs between any positions along the extending direction of the branch wiring (even if the short circuit pattern SC exists), the occurrence of the short circuit can be reliably inspected. Furthermore, according to this short circuit inspection apparatus 1A, the branch wirings 11 and 15 located on both sides of the plurality of branch wirings 11 to 15 are also checked for the presence or absence of a short circuit between adjacent branch wirings as the inspection branch wiring. Can be inspected.

  In the configuration in which one branch wiring adjacent to one of the pair of inspection branch wirings 12 and 13 is defined as an auxiliary branch wiring, for example, as shown in FIG. The branch wiring (branch wiring 13) located in the middle of all the branch wirings of the inspection branch wirings 12 and 13 and the auxiliary branch wiring 14 is replaced with a current supply branch wiring set (branch wirings 13 and 14) and a voltage measurement branch wiring. As a common branch line for the set (branch lines 12, 13), the probes 2b, 2c, 3b, 3c of the current supply unit 2 and the voltage measurement unit 3 are connected to the land of each branch line (branch lines 12, 13, 14). A configuration of connecting to (lands 22, 23, 24) can also be adopted.

  Also in this configuration, since the lands 21 to 25 respectively formed at the tips of the branch wirings 11 to 15 are used as probing points, the extension in one branch wiring of the pair of branch wirings as the inspection branch wirings Even if a short circuit occurs between any position along the direction and any position along the extending direction of the other branch wiring, the occurrence of the short circuit can be reliably inspected. Further, the branch wirings 11 and 15 located on both sides of the plurality of branch wirings can also be inspected for the presence or absence of a short circuit between adjacent branch wirings as the inspection branch wiring.

  Further, in the short-circuit inspection devices 1 and 1A described above, a configuration in which the voltage V itself is used as an electrical parameter based on the voltage V measured by the voltage measuring unit 3 (the voltage V and a determination specified in advance corresponding to the voltage V). A range (voltage value range) is compared and the presence or absence of a short circuit is inspected), but the resistance calculated based on the voltage V and the inspection current I as an electrical parameter based on the voltage V A configuration using values (resistance values between a pair of branch wires constituting a set of voltage measurement branch wires) can also be adopted.

DESCRIPTION OF SYMBOLS 1 Short circuit inspection apparatus 2 Current supply part 3 Voltage measurement part 5 Processing part 11-16 Branch wiring 13,14 Inspection branch wiring 12,15 Auxiliary branch wiring 21-26 Land (probing point)
I Inspection current M Trunk wiring

Claims (5)

A short circuit between the inspection branch wirings using a pair of adjacent branch wirings among the branch wirings as inspection branch wirings for a circuit board on which a plurality of branch wirings extending in a branch shape from the trunk wiring are formed. A short-circuit inspection device for inspecting the presence or absence of
When the branch wiring located on at least one of the pair of inspection branch wirings is defined as an auxiliary branch wiring,
An arbitrary pair of branch wirings of the pair of inspection branch wirings and auxiliary branch wirings is defined as a current supply branch wiring set, and formed on the front end side of each branch wiring constituting the current supply branch wiring set, respectively. A current supply for supplying the inspection current from the probing point that has been made,
An arbitrary pair of branch wirings of the pair of test branch wirings and the auxiliary branch wirings, wherein a pair of branch wirings different from the current supply branch wiring set by at least one branch wiring is a voltage. As a measurement branch wiring set, a voltage measurement unit that measures a voltage between wirings generated between probing points respectively defined on the front end side of each branch wiring constituting the voltage measurement branch wiring set,
A determination range for electrical parameters based on the inter-wiring voltage defined in advance based on the inter-wiring voltage measured when the inspection current is supplied in a state where the short-circuit does not occur between the pair of inspection branch wirings is stored. A storage unit;
Comparing the determination range with the electrical parameter based on the inter-wiring voltage measured by the voltage measuring unit in a state in which the inspection current is supplied from the current supply unit to the set of current supply branch wires Thus, a short circuit inspection apparatus comprising: a processing unit that inspects the presence or absence of the short circuit between the pair of inspection branch wirings. When a pair of branch wirings located on both sides of the pair of inspection branch wirings are defined as the auxiliary branch wirings,
Said voltage measuring unit, said pair of test branch wiring and the pair of with any different that a pair of branch lines of the branch line that make up the set of current supply branch line of all the branch lines of the auxiliary branch wiring The short circuit inspection apparatus according to claim 1, wherein the voltage between the wirings is measured with the set of voltage measurement branch wirings as a set. The set of current supply branch wirings includes one inspection branch wiring of the pair of inspection branch wirings and auxiliary branch wiring on the one inspection branch wiring side of the pair of auxiliary branch wirings,
The set of voltage measurement branch lines includes the other test branch line of the pair of test branch lines and the auxiliary branch line on the other test branch line side of the pair of auxiliary branch lines. Item 3. The short circuit inspection device according to item 2. When one branch wiring adjacent to one inspection branch wiring of the pair of inspection branch wirings is defined as an auxiliary branch wiring,
The voltage measuring unit is a pair of any pair of branch wirings among all the branch wirings of the pair of test branch wirings and the auxiliary branch wirings, and the set of current supply branch wirings and one branch wiring are The short circuit inspection apparatus according to claim 1, wherein the voltage between the wirings is measured by using a pair of different branch wirings as a set of voltage measurement branch wirings. A short circuit between the inspection branch wirings using a pair of adjacent branch wirings among the branch wirings as inspection branch wirings for a circuit board on which a plurality of branch wirings extending in a branch shape from the trunk wiring are formed. A short-circuit inspection method for inspecting the presence or absence of
When the branch wiring located on at least one of the pair of inspection branch wirings is defined as an auxiliary branch wiring,
An arbitrary pair of branch wirings of the pair of inspection branch wirings and auxiliary branch wirings is defined as a current supply branch wiring set, and formed on the front end side of each branch wiring constituting the current supply branch wiring set, respectively. Supply inspection current from the probing point
An arbitrary pair of branch wirings of the pair of test branch wirings and the auxiliary branch wirings, wherein a pair of branch wirings different from the current supply branch wiring set by at least one branch wiring is a voltage. As a set of measurement branch wiring, measure the voltage between wirings generated between the probing points respectively defined on the tip side of each branch wiring constituting the set of voltage measurement branch wiring,
A determination range for the electrical parameter based on the inter-wiring voltage defined in advance based on the inter-wiring voltage measured when the inspection current is supplied in a state where the short-circuit does not occur between the pair of inspection branch wirings and the measurement A short circuit inspection method for inspecting the presence or absence of the short circuit between the pair of inspection branch wirings by comparing the electrical parameters based on the inter-wiring voltage.

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