Electrical characteristics acquisition device

Abstract

The present disclosure addresses the problem of satisfactorily acquiring an open correction value.　In an electrical characteristic acquiring device according to the present disclosure, an open correction value, which is an electrical characteristic for a case in which a distance between a pair of probes is a length, on an electrode side, of a component to be acquired, is obtained by calculation on the basis of a measured value of the electrical property for a case in which the distance between the pair of probes is a set length, the set length, and the length, on the electrode side, of the component.　Therefore, an open correction value can be acquired accurately even if it is difficult to adjust a gap between the pair of probes.　Further, it is not necessary to measure the open correction value each time the component to be acquired is changed, and the operational efficiency can be improved accordingly.

Description

Technical Field

[0001] The present disclosure relates to an electrical characteristic acquisition device for acquiring the electrical characteristics of electronic components.

Background Art

[0002] Patent Document 1 describes a jig for obtaining an open correction value when obtaining impedance as an electrical characteristic of an electronic component. This jig has a surface made of an insulator and a thickness that varies in multiple stages. With the portion of this jig where the thickness is the same as the length on the electrode side of the component being gripped by a pair of measuring probes, the stray admittance as the open correction value is measured. As a result, the stray admittance when the distance between the pair of measuring probes is the same as the length on the electrode side of the component can be accurately obtained.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] An object of the present disclosure is to obtain an open correction value satisfactorily. Means, Actions, and Effects for Solving the Problems

[0005] In the electrical characteristic acquisition device according to the present disclosure, the open correction value, which is an electrical characteristic when the distance between a pair of measuring probes is the length on the electrode side of the component to be acquired, is obtained by calculation based on the measured value of the electrical characteristic when the distance between the pair of measuring probes is the set length, the set length, and the length on the electrode side of the component to be acquired. Therefore, even when it is difficult to adjust the interval between the pair of measuring probes, the open correction value can be accurately obtained. In addition, every time the component to be acquired changes, it is not necessary to measure the open correction value, and thus the work efficiency can be improved accordingly.

Brief Description of the Drawings

[0006] [Figure 1] This is a perspective view of a mounting machine including an electrical characteristics acquisition device, which is one embodiment of the present disclosure. [Figure 2] This is a perspective view of the main part of the electrical characteristics acquisition device described above. [Figure 3] This is a cross-sectional view of the main part of the electrical characteristics acquisition device described above. [Figure 4] This is a partial plan view of the electrical characteristics acquisition device described above. [Figure 5] This is an air circuit diagram included in the above-mentioned electrical characteristic acquisition device. [Figure 6] This diagram conceptually illustrates the coaxial cable used in the above-mentioned electrical characteristics acquisition device. [Figure 7] This is a cross-sectional view of the same potential section in the coaxial cable described above. [Figure 8] This is a diagram showing the above-mentioned area with the same potential broken down. [Figure 9] This diagram conceptually shows the electrical characteristic measurement circuit of the electrical characteristic acquisition device described above. [Figure 10] This diagram conceptually shows the equivalent circuit of the electrical characteristic measurement circuit described above. [Figure 11] This diagram conceptually shows the components whose electrical characteristics are acquired by the electrical characteristic acquisition device described above. [Figure 12] This figure shows the relative positional relationship between the holding base and the pair of measuring probes when acquiring open-circuit correction values ​​in the above-mentioned electrical characteristics device. [Figure 13] This is a block diagram conceptually representing the area around the control device of the electrical characteristic acquisition device described above. [Figure 14] This is a flowchart showing the electrical characteristic acquisition program stored in the memory unit of the control device described above. [Figure 15] Figure 15A shows the initial state of the electrical characteristic acquisition device, Figure 15B shows the clamped state, Figure 15C shows the measurement state, and Figure 15D shows the disposal state. Embodiment

[0007] Hereinafter, a mounting device including a measuring device as an electrical characteristic acquisition device, which is one embodiment of the present disclosure, will be described in detail with reference to the drawings. [Examples]

[0008] The mounting machine shown in Figure 1 is used to mount components onto a circuit board and includes a main unit 2, a circuit board transport and holding device 4, a component supply device 6, a head moving device 8, etc. The circuit board transport and holding device 4 transports and holds the circuit board P (hereinafter abbreviated as board P) in a horizontal position. In Figure 1, the transport direction of board P is the x-direction, the width direction of board P is the y-direction, and the thickness direction of board P is the z-direction. The y-direction and z-direction are the front-to-back and up-and-down directions of the mounting machine, respectively. These x-direction, y-direction, and z-direction are orthogonal to each other. The component supply device 6 supplies electronic components (hereinafter abbreviated as components) s to be mounted on board P and includes a plurality of tape feeders 14, etc. The head moving device 8 holds the mounting head 16 and moves it in the x, y, and z directions. The mounting head 16 has a suction nozzle 18 that picks up and holds the components s.

[0009] Reference numeral 20 indicates a camera. The camera 20 captures an image of the component s held by the suction nozzle 18, and based on the image captured by the camera 20, it is determined whether or not the component s is intended to be mounted on the circuit board P. Reference numeral 22 indicates a measuring device. The measuring device 22 measures the electrical characteristics of the component s. The electrical characteristics of the component s include L (inductance), C (capacitance), R (resistance), X (reactance), Z' (impedance), etc., and one or more of these are measured by the measuring device 22.

[0010] The measuring device 22 is mounted on the mounting machine and is provided on the main body of the circuit board transport and holding device 4 via a storage box 26. A waste passage 28 is provided between the storage box 26 and the measuring device 22, and the components s whose electrical characteristics have been measured are stored in the storage box 26 via the waste passage 28. The measuring device 22 is height-adjustable and mounted on the storage box 26. As shown in Figures 2 and 3, a base portion 30 is engaged with the storage box 26 so as to be vertically movable, and a measuring table 29 is detachably held on the base portion 30 by fastening parts 31 (see Figures 3 and 4), including bolts and nuts, etc. (hereinafter, fastening parts broadly include parts that fasten two members together). These base portion 30 and measuring table 29 are vertically movable as a single unit. In addition, the measuring table 29 and the base portion 30 are provided with through holes 29a and 30a, respectively, that can communicate with the waste passage 28 (see Figures 3 and 4).

[0011] As shown in Figures 2 to 4, the measuring device 22 includes the measuring table 29 and base portion 30, a holding table 32 capable of holding the part s, a pair of measuring probes 37 consisting of a stator 34 and a movable element 36, a holding table moving device 40 for moving the holding table 32, a movable element moving device 41 as an approach / separation device for moving the movable element 36 closer to and further away from the stator 34, a measuring section 42 (see Figure 4), etc. In this embodiment, as shown in Figures 11(a) and (b), the part s has electrodes sp1 and sp2 at both ends and can be gripped by the pair of measuring probes 37, and can be, for example, a corner chip. The part s as a corner chip can be, for example, as shown in Figure 11(b), generally forming a rectangle in plan view, and the length d on the side having electrodes sp1 and sp2 at both ends is referred to as the electrode side length d of the part s.

[0012] The holding base 32 includes a component placement part 44 and a placement part holder 46 that holds the component placement part 44. A V-groove 44c is formed in the component placement part 44, and the component s is placed thereon. The component placement part 44 abuts against the placement part holder 46 and is fixed by a fastening part 47. Further, the placement part holder 46 abuts against the measurement table 29 via a stopper 90 (see FIG. 3), and as described above, the measurement table 29 is fixed to the base part 30 by a fastening part 31. And the component placement part 44, the placement part holder 46, the stopper 90, the measurement table 29, the base part 30, the fastening parts 31 and 47, etc. are made of a conductive material, which is a material having conductivity. Also, the base part 30 is grounded. Thus, the component placement part 44 is grounded. And thereby, for the component s placed on the component placement part 44, static elimination can be performed.

[0013] The stator 34 and the rotor 36 each have opposing surfaces 34f and 36f that face each other, and the component s is gripped by these pair of opposing surfaces 34f and 36f. The stator 34 is held by a stator holder 55, and the stator holder 55 is fixed to the measurement table 29. The rotor 36 is integrally and movably held by a rotor holder 56, and the rotor holder 56 is provided movably with respect to the measurement table 29. Thereby, the rotor 36 can approach and separate from the stator 34.

[0014] The opposing surface 36f of the rotor 36 has a shape that can enter the V-groove 44c formed on the upper surface of the holding base 32. In other words, it generally forms a triangular shape corresponding to the V-groove 44c. Therefore, the rotor 36 can grip the component s placed in the V-groove 44c together with the stator 34. Further, the rotor 36 includes a front end part 36a including the opposing surface 36f, and the front end part 36a has a shape that protrudes downward from the middle part 36b. The outer surface of the front end part 36a is close to the inner surface of the V-groove 44c, but the middle part 36b has a shape that is largely separated from the inner surface of the V-groove 44c.

[0015] As shown in Fig. 4 and the like, a coaxial cable portion 58 is connected to the stator holder 55 via a bracket 57, and a coaxial cable portion 60 is connected to the mover holder 56 via a bracket 59. Since the stator holder 55, the stator 34, the mover holder 56, the mover 36, and the brackets 57 and 59 are all made of conductive materials, the stator 34, the mover 36 and the coaxial cable portions 58 and 60 are electrically connected. Further, an electrical characteristic measurement circuit 61 is formed by the stator 34, the mover 36, etc., the coaxial cable portions 58 and 60, the measurement unit 42, etc.

[0016] As shown in Fig. 3, an air passage 70 is formed in a member on the stator side {for example, one or more of the upper part of the stator 34, the portion of the stator holder 55 above the stator 34, and the measurement table 29}, and is connected to air cylinders 72 and 74 as fluid pressure cylinders. An opening 70a of the air passage 70 is formed to face the opposing surface 36f of the mover 36. Further, an ionizer 76 is provided in the air passage 70. The ionizer 76 generates corona discharge to ionize air.

[0017] As shown in Fig. 5, the air cylinder 72 is a drive source of the holder moving device 40, and a placement portion holder 46 is connected to the piston rod 72p (see Fig. 5) of the air cylinder 72. A solenoid valve device 80 is provided between the two air chambers 72a and 72b of the air cylinder 72, the air source 78, the air passage 70, and the filter (atmosphere). By controlling the solenoid valve device 80, the movement of the placement portion holder 46 (holder 32) is controlled.

[0018] The air cylinder 74 is a drive source of the mover moving device 41, and the mover holder 56 is connected to the piston rod 74p. The air chambers 74a and 74b of the air cylinder 74 are connected to the air source 78, the air passage 70, and the filter (atmosphere) via a solenoid valve device 82. By controlling the solenoid valve device 82, the movement of the mover holder 56 (mover 36) is controlled. Further, when the holder 32 moves forward and the mover 36 moves backward, air is supplied from the air cylinders 72 and 74 to the air passage 70 and discharged from the opening 70a toward the mover 36.

[0019] A pair of guide rods 86 and 87 extending in the y-direction are provided on the holding base 32 and the movable element holder 56, and a pair of guide rods 88 and 89 extending in the y-direction are provided on the movable element holder 56 and the measuring base 29. Furthermore, these guide rods 86, 87, 88, and 89 (see Figure 2) allow the holding base 32 and the movable element 36 to move relative to each other in the y-direction with respect to the measuring base 29, and also allow the holding base 32 and the movable element 36 to move relative to each other in the y-direction.

[0020] Furthermore, as shown in Figure 3, a stopper 92 is provided on the stator side of the movable element holder 56, and a stopper 90 is provided on the part of the measuring table 29 that holds the stator holder 55. The stopper 92 defines the limit of proximity between the movable element holder 56 and the holding table 32 (mounting part holder 46), and the stopper 90 defines the limit of proximity between the stator 34 (measuring table 29) and the holding table 32.

[0021] The support base 32 is moved by the support base moving device 40 between a position in contact with the stopper 90 and a position in contact with the stopper 92. When the support base 32 is in the position in contact with the stopper 90, and the pair of measuring probes 37 are spaced apart (the movable probe 36 is spaced apart from the stator 34), at least a part of the support base 32 is located between the pair of measuring probes 37, and the support base 32 is in close proximity to the pair of measuring probes 37. When the support base 32 is in the position in contact with the stopper 92, the support base 32 is not located between the pair of measuring probes 37, and is at least a set distance a (see Figure 12) away from at least one of the pair of measuring probes 37 (the movable probe 36).

[0022] On the other hand, as shown in Figure 4, the surface of the measuring platform 29 and the surface of the base 30 are electrically connected by an earth wire 132. An earth wire is also connected to the base 30, thereby eliminating static electricity from the entire measuring device 22.

[0023] In the electrical characteristics measurement circuit 61, as shown in Figure 4, the coaxial cable sections 58 and 60 each contain two coaxial cables 58a, 58b and two coaxial cables 60a, 60b, respectively. The coaxial cables 58a, 58b and 60a, 60b each have the same structure and, as shown in Figure 6, include an internal conductor 140, an insulator (dielectric) 142, an external conductor 144, a protective coating 146, etc., arranged coaxially. The external conductor 144 is often formed from braided copper wire, which is made by weaving copper wires into a mesh, and is usually connected to the ground. By providing the external conductor 144, leakage of the transmitted signal to the outside is suppressed. For this reason, the copper wire of the external conductor 144 can be called a shield wire. Furthermore, the internal conductor 140, insulator 142, and external conductor 144 are covered with a protective coating 146.

[0024] In this embodiment, the electrical characteristics of component s are measured by the automatic balanced bridge method, and the coaxial cables 58a, 58b, 60a, and 60b are connected by the four-terminal pair measurement method. However, the method for measuring the electrical characteristics of component s and the method for connecting the coaxial cable sections 58 and 60 are not limited to the automatic balanced bridge method and the four-terminal pair measurement method.

[0025] As shown in Figure 8, the internal conductors 140 of the coaxial cables 58a and 58b are each connected to one (identical) probe-side connector 58c, and the probe-side connector 58c is attached to the bracket 57. The internal conductors 140 of the coaxial cables 60a and 60b are also connected to one probe-side connector 60c, and the probe-side connector 60c is attached to the bracket 59.

[0026] Furthermore, the other ends of the coaxial cables 58a, 58b and 60a, 60b, respectively, which are the detection unit side connection parts 58p, 58q, 60p, 60q, are connected to the terminals Hc, Hp, Lc, and Lp of the measurement unit 42, as shown in Figures 4 and 9.

[0027] As conceptually shown in Figure 9, an AC power supply is connected to the coaxial cable 58a. The output of the AC power supply is supplied to the inner conductor 140 of the coaxial cable 58a and returned via the outer conductor 144. In the coaxial cable 58b, the potential difference between the inner conductor 140 and the outer conductor 144 is detected as the voltage value applied to component s.

[0028] In coaxial cable 60a, the current flowing between the inner conductor 140 and the outer conductor 144 is obtained as the current value flowing through component s. More precisely, the potential difference across a resistor with resistance value Rx (not shown) provided between the inner conductor 140 and the outer conductor 144 is obtained, and the current flowing through the resistor is obtained based on that potential difference and the resistance value Rx. In coaxial cable 60b, the potential difference between the inner conductor 140 and the outer conductor 144 is detected, and the components of the measuring unit 42 (oscillator, etc., not shown) are controlled so that the detected potential difference becomes 0. As a result, the current flowing through the resistor and the current flowing through component s become the same, and the current flowing through the resistor obtained at terminal Lc in that state is taken as the current value flowing through component s.

[0029] Each of the coaxial cables 58a, 58b, 60a, and 60b is provided with a potential zone 150, where the outer conductors 144 of each coaxial cable 58a, 58b, 60a, and 60b are electrically connected to one another. As shown in Figures 7 and 8, the protective coating 146 is removed from each of the coaxial cables 58a, 58b, 60a, and 60b, and copper foil tape 152 is wrapped around the exposed outer conductor 144, and solder 154 is applied. In other words, the coaxial cables 58a, 58b, 60a, and 60b are located at the vertices of a rectangle, and adjacent cables are connected to each other by solder 154. In addition, the parts where the protective coating 146 has been removed are covered with a protective tube 156.

[0030] Thus, in the same potential section 150, as shown in Figure 9, the outer conductors 144 of the coaxial cables 58a, 58b, 60a, and 60b can be energized with each other, and the potential of each outer conductor 144 can be made the same. The outer conductors 144 of the coaxial cables 58a, 58b, 60a, and 60b are all at the same ground potential.

[0031] In this way, when coaxial cables 58a, 58b, 60a, and 60b are connected using the four-terminal pair measurement method, the current flowing through component s and the voltage applied to component s are measured by separate circuits. Furthermore, since the currents flowing through the inner conductor 140 and the outer conductor 144 are in opposite directions, the generation of magnetic flux in the inner conductor 140 and the outer conductor 144 can be suppressed. As a result, the current and voltage flowing through component s can be measured with high accuracy. Moreover, by providing a uniform potential section 150, the outer conductors 144 of multiple coaxial cables 58 and 60 are brought to the same ground potential, which reduces noise and allows for stable detection of the electrical characteristics of component s.

[0032] However, the electrical characteristic measurement circuit (hereinafter sometimes simply referred to as the measurement circuit) 61 is a part specifically provided in this measuring device 22 and can be called a test fixture (accessory). On the other hand, when the electrical characteristics of a component s are acquired in the measurement circuit 61, if current is supplied to the cable sections 58, 60, etc., electrical disturbances occur in parts other than the component s, affecting the measured electrical characteristics, which are the electrical characteristics of the component s measured by the measurement section 42. In order to minimize this effect, disturbances (residual impedance, stray admittance) are determined, and the measured electrical characteristics are corrected to obtain the final electrical characteristics of the component s.

[0033] Figure 10 shows the equivalent circuit of this measurement circuit (test fixture) 61. In the equivalent circuit, it is assumed that a resistor 160 and an inductor 161 are located in series with the pair of measuring elements 37 (stator 34 and movable element 36), and a resistor 162 and a capacitor 163 are located in parallel with the pair of measuring elements 37. The residual impedance of the measurement circuit 61 is the impedance that occurs in series with component s, and the stray admittance is the reciprocal of the impedance that occurs between component s and the pair of measuring elements 37 in parallel. It can be assumed that the residual impedance occurs in resistor 160 and inductor 161 in the equivalent circuit, and the stray admittance occurs in resistor 162 and capacitor 163.

[0034] The residual impedance Zs can be obtained as the impedance measured by the measuring unit 42 when the pair of measuring probes 37 are in contact with each other. The residual impedance can be called a short-circuit correction value. In this embodiment, the solenoid valve device 80 and the solenoid valve device 82 are controlled to bring the movable element 36 closer to the stator 34, causing them to come into contact with each other, and the retaining base 32 is retracted until it abuts the stopper 92, separating it from the pair of measuring probes 37. The retaining base 32 is made of a conductive material, but when it is retracted to a position behind the front end 36a of the movable element 36, the distance between the movable element 36 of the pair of measuring probes 37 and the retaining base 32 becomes greater than or equal to a set distance, and the influence of the retaining base 32 on the value measured by the measuring unit 42 becomes small. In this state, the measuring unit 42 obtains a short-circuit correction value as the residual impedance Zs.

[0035] The residual impedance Zs can be expressed in the equivalent circuit of Figure 10 as shown in the following equation. Rs is the resistance value, which is the electrical characteristic of resistor 160, and jLsω is the impedance, which is the electrical characteristic of coil 161. Zs = Rs + jLs ω

[0036] Floating admittance can be obtained by measuring it with the measuring unit 42 when the distance between a pair of measuring probes 37 is the length d on the electrode side of the component s of the object whose electrical characteristics are to be measured (the object to be acquired). However, in this embodiment, the movable element 36 is made to move closer to and further away from the stator 34 by the drive of the air cylinder 74. Therefore, it is difficult to adjust the distance between the pair of measuring probes 37 to length d. Accordingly, in this embodiment, in the steady state of the measuring device 22, that is, when the movable element 36 is in the retracted end position, in other words, when the distance between the pair of measuring probes 37 is a predetermined set length x, the floating admittance (which can be called the reference floating admittance) Yox is measured by the measuring unit 42 and stored in advance. Then, an open correction value is obtained based on the reference floating admittance Yox, the set length x, and the electrode-side length d of the component s. The set length x, which is the distance between the pair of measuring probes 37 in the initial state of the measuring device 22 (when the movable element 36 is in the retracted end position), is often known, but if it is not known, it can be obtained by actually measuring it.

[0037] When acquiring the reference floating admittance Yox, as shown in Figure 12, with the pair of measuring probes 37 separated, the solenoid valve device 80 controls the holder 32 to a retracted end position where it contacts the stopper 92.

[0038] If, for example, the pair of measuring probes 37 are separated and the holder 32 is located between them, the holder 32, which is made of a conductive material, will be in close proximity to or in contact with the pair of measuring probes 37, and the presence of the holder 32 will affect the measurement value (floating admittance) obtained by the measuring unit 42.

[0039] Furthermore, it is desirable to maintain conditions as similar as possible when measuring the reference suspended admittance Yox and when measuring the electrical characteristics of component s. For example, it is desirable to set the thickness of the air layer between the pair of measuring probes 37 to approximately the same level. In other words, it is desirable to make the amount of air per unit length between the pair of measuring probes 37 the same.

[0040] Therefore, when measuring the reference floating admittance Yox, the holder 32 is moved to a retracted end position that contacts the stopper 92 and is not located between the pair of measuring probes 37. In this state, the holder 32 is separated from the movable element 36 by a set distance a or more, and the influence of the measuring section 42 of the holder 32 on the measurement value can be reduced.

[0041] The reference stray admittance Yox can be expressed as shown in the following equation, where C is the capacitance of capacitor 163 and Ro is the resistance of resistor 162. Yox = jCω + 1 / Ro In the above equation, the resistance value Ro is the resistance of air, which occurs between a pair of spaced-apart measuring elements 37, and is therefore a very large value. For this reason, 1 / Ro can be considered to be approximately 0. From the above, the reference floating admittance Yox can be expressed as shown in the following equation. Yox≒jCω

[0042] On the other hand, it is known that the capacitance C of a capacitor is inversely proportional to the distance between a pair of electrodes. Therefore, based on the reference floating admittance Yox measured by the measuring unit 42 when the distance between the pair of measuring probes 37 is a set length x, the open correction value, which is the floating admittance (which can be called the component-corresponding floating admittance) Yod when the length is d, can be calculated according to the following formula. Yod = Yox·x / d···(1)

[0043] Furthermore, the following equation holds between the short-circuit correction value Zs, the open-circuit correction value Yod, the measurement impedance Zm which is the measurement electrical characteristic measured by the measurement unit 42 while the component s is held by a pair of measuring probes 37, and the final impedance Zdut of the component s. Zdut(Zm-Zs)Yod+(Zm-Zs)=Zdut Rearranging the above equation, the final impedance Zdut of component s can be expressed by the following equation. Zdut=(Zm-Zs) / {1-(Zm-Zs)Yod}···(2)

[0044] Thus, in this embodiment, regardless of the length d of the electrode side of component s, an open-circuit correction value can be obtained by calculation.

[0045] The mounting machine includes a control device 200. As shown in Figure 13, the control device 200 includes a computer-based controller 202 and a plurality of drive circuits 204. The controller 202 includes an execution unit 210, a storage unit 212, an input / output unit 214, etc. The input / output unit 214 is connected to a substrate transport and holding device 4, a component supply device 6, and a head moving device 8, each via the drive circuits 204, as well as to solenoid valve devices 80, 82 of the holding base moving device 40 and the movable element moving device 41. In addition, a measuring unit 42, a display 216, a movable element position sensor 218, a holding base position sensor 220, a nozzle height sensor 222, etc. are connected.

[0046] In this embodiment, the memory unit 212 stores the set length x, the reference stray admittance Yox for the set length x, and the short-circuit correction value Zs. In addition, as work plan information, the shape of the component s from which the impedance is acquired (for example, including the length on the electrode side), the default value of the impedance, etc., are input via an input device (not shown) and stored in the memory unit 212 or a memory unit other than the memory unit 212.

[0047] The electrical characteristics of component s are measured by executing the electrical characteristics measurement program shown in the flowchart of Figure 14. The solenoid valve devices 80 and 82 are controlled based on the output signals of the movable element position sensor 218, the holder base position sensor 220, etc. The measurement results can be displayed on the display 216. The measuring device 22 is always in the initial state shown in Figure 15A. The movable element 36 is in the retracted end position, and the holder base 32 is in the forward end position, i.e., in contact with the stopper 90.

[0048] In Step 1 (hereinafter abbreviated as S1; the same applies to the other steps), it is determined whether or not a command to measure the electrical characteristics of component s has been issued. For example, if a command to measure the electrical characteristics of component s has been issued, such as when a changeover is performed, the determination is YES.

[0049] In S2, the open correction value Yod for component s is determined according to equation (1). The reference stray admittance Yox, the set length x, and the length d on the electrode side of the component to be acquired, which is the component whose impedance will be acquired next, stored in the memory unit 212 are read, and the component-corresponding stray admittance Yod is acquired according to equation (1) when the distance between the pair of measuring probes 37 is the length d on the electrode side of the component to be acquired.

[0050] Next, in S3, the mounting head 16 is moved. The mounting head 16 reaches the V-groove 44c, the suction nozzle 18 is lowered, the part s is released, and the part s is placed on the V-groove 44c. In S4, the movable element 36 is advanced by the control of the solenoid valve device 82, and as shown in Figure 15B, the part s is clamped by the movable element 36 and the stator 34. In S5, as shown in Figure 15C, the retaining base 32 is retracted by the control of the solenoid valve device 80 until it contacts the stopper 92. The retaining base 32 reaches a position where it does not come into contact with the part s or the movable element 36.

[0051] In S6, the component s is released by the suction nozzle 18 and placed on the V-groove 44c. The system waits for the set static discharge time to elapse. The static discharge time is the time required to remove static electricity charged on the component s, and is predetermined. When the elapsed time reaches the static discharge time, the judgment in S6 becomes YES, and in S7, the measured impedance Zm of the component s is measured. Then, in S8, the measured impedance Zm, the open-circuit correction value Yod obtained in S2, and the short-circuit correction value Zs stored in the memory unit 212 are substituted into equation (2) to obtain the final impedance Zdut of the component s. The final impedance Zdut can also be displayed on the display 216, or it can be compared with a default value, and the comparison result can be displayed on the display 216.

[0052] Then, after the final impedance Zdut of component s is obtained, in S9, the movable element 36 is retracted, and component s, which was gripped between the movable element 36 and the stator 34, is released. In addition, as the movable element 36 retracts, air is supplied from the opening 70a to the opposing surface 36f of the movable element 36 from diagonally above. As a result, even if component s is adhering to the opposing surface 36f, component s can be easily removed.

[0053] In S10, as shown in Figure 15D, the retaining base 32 is retracted. The space between the movable element 36 and the stator 34 is connected to the waste passage 28, allowing the parts s to be placed in the storage box 26. After the retaining base 32 is retracted until it contacts the stopper 92, in S11, the retaining base 32 is advanced and positioned between the pair of opposing surfaces 34f and 36f. The space above the V-groove 44c is made available, allowing parts s to be placed, and the system returns to the initial state shown in Figure 15A. In addition, as the retaining base 32 advances, air containing ions is supplied to the opposing surface 36f of the movable element 36, thus enabling static elimination of the opposing surface 36f.

[0054] As described above, in this embodiment, the open-circuit correction value is accurately obtained. As a result, the final impedance of component s can be obtained with high accuracy. Even if the component s being measured has a small impedance, its impedance can be measured with high accuracy. Furthermore, the open-loop correction value can be quickly and easily obtained through calculation, even if the target component s changes and the length of the electrode side changes. There is no need to adjust the spacing between the pair of measuring probes 37 each time to obtain the open-loop correction value. As a result, a decrease in work efficiency can be suppressed.

[0055] In this embodiment, the processing unit is configured by the control device 200, etc., and the electrical characteristic acquisition device is configured by the control device 200 and the measuring device 22, etc. Furthermore, the open correction value acquisition unit is configured by the storage unit 212, the part of the control device 200 that stores S2, the part that executes it, etc.

[0056] Note that S8 can be executed after S11. Furthermore, although the above embodiment described a case in which the measuring device as an electrical characteristic acquisition device is provided on the mounting machine, the measuring device can be used independently instead of being provided on the mounting machine.

[0057] Furthermore, while the above embodiment described the case where impedance is obtained as an electrical characteristic, other electrical characteristics such as resistance and reactance can also be obtained, not just impedance.

[0058] In addition to the embodiments described above, this disclosure can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. [Explanation of Symbols]

[0059] 22: Measuring device 32: Holding base 34: Stator 36: Movable element 42: Measuring section 44: Component mounting section 57, 59: Bracket 58, 60: Coaxial cable section 58a, 58b, 60a, 60b: Coaxial cable 61: Electrical characteristic measurement circuit 150: Same potential section 200: Control device 202: Memory section Claimable configuration

[0060] (1) An electrical characteristic acquisition device mounted on a mounting machine that picks up components supplied by a component supply device and mounts them on a circuit board, wherein a pair of measuring probes grip the components to acquire the electrical characteristics of the components, A measuring unit for measuring the electrical characteristics of the aforementioned component, An open-circuit correction value acquisition unit calculates and acquires an open-circuit correction value for the electrical characteristics measured by the measuring unit when the distance between the pair of measuring probes is a predetermined set length, based on the set length and the length on the electrode side of the component, where the distance between the pair of measuring probes is the length on the electrode side of the component. A processing unit that corrects the measured electrical characteristics, which are the electrical characteristics of the component measured by the measuring unit, with at least the open-circuit correction value acquired by the open-circuit correction value acquisition unit to obtain the final electrical characteristics of the component. An electrical characteristics acquisition device, including one.

[0061] The component is one that can be grasped by a pair of measuring probes and has a pair of electrodes facing each other. The length of the component on the side where the pair of electrodes are positioned facing each other is called the electrode side length.

[0062] The final electrical characteristics are those output by this electrical characteristics acquisition device and can be referred to as output electrical characteristics. These final electrical characteristics are closer to the true electrical characteristics of the component than the measured electrical characteristics.

[0063] (2) The electrical characteristic acquisition device according to item (1), wherein the open correction value acquisition unit acquires the open correction value by calculation based on the floating admittance as an electrical characteristic measured by the measurement unit when the distance between the pair of measuring probes is the set length, the set length, and the length on the electrode side of the component, so as the floating admittance when the distance between the pair of measuring probes is the length on the electrode side of the component.

[0064] The measurement unit corrects the measurement impedance, which is the measurement electrical characteristic, by at least an open-circuit correction value to obtain the final impedance, which is the final electrical characteristic of the component.

[0065] (3) The electrical characteristic acquisition device according to item (2), which includes a storage unit that stores in advance the set length and a reference floating admittance which is the floating admittance measured by the measuring unit when the distance between the pair of measuring probes is the set length.

[0066] The open correction value acquisition unit calculates and acquires an open correction value (component-corresponding floating admittance, which is the floating admittance when the distance between a pair of measuring probes is the length on the electrode side of the component) based on the length of the electrode side of the component to be measured (acquisition target), the set length stored in the memory unit, and the reference floating admittance.

[0067] (4) The electrical characteristic acquisition device includes an approach / separation device that moves the pair of measuring probes closer together and further apart, The electrical characteristic acquisition device according to any one of items (1) to (3), wherein the approach / separation device includes a fluid pressure cylinder.

[0068] The fluid pressure cylinder can be an air cylinder, a hydraulic cylinder, etc. When the approach / separation device includes a fluid pressure cylinder, cost reduction can be achieved compared to when it includes a motor.

[0069] (5) The electrical characteristic acquisition device is movable between a position between the pair of measuring probes and a position away from the pair of measuring probes, and includes a holder capable of holding the components, The electrical characteristic acquisition device according to any one of items (1) to (4), wherein the measuring unit measures the electrical characteristics when the distance between the pair of measuring probes is the set length and the holding base is in a position away from the pair of measuring probes.

[0070] (6) The pair of measuring probes are capable of gripping the part placed on the part placement section of the holding base by approaching each other, At a position between the pair of measuring probes, at least a portion of the holding base is located between the pair of measuring probes. The electrical characteristic acquisition device according to item (5), wherein, at the aforementioned detached position, the distance between the holding base and at least one of the pair of measuring probes is greater than or equal to a set distance.

[0071] In the electrical characteristic acquisition device described in this section, the distance between the measuring probe closer to the holder (movable probe 36 in the above embodiment) and the holder is greater than or equal to the set distance a.

[0072] (7) The pair of measuring probes and the measuring unit are connected by two coaxial cables, An electrical characteristic acquisition device according to any one of items (1) to (6), wherein the two coaxial cables are connected to the measurement unit by a four-terminal pair measurement method.

[0073] (8) The electrical characteristics acquisition device is A pair of coaxial cable sections connected to each of the pair of measuring probes, A single potential section is provided in the pair of coaxial cable sections, electrically connecting the outer conductors of each of the multiple coaxial cables included in the pair of coaxial cable sections to each other and making them at the same potential. An electrical characterization apparatus as described in any one of items (1) through (7), including the following:

[0074] (9) An electrical characteristic acquisition device mounted on a mounting machine that picks up components supplied by a component supply device and mounts them on a circuit board, wherein a pair of measuring probes grip the components to acquire the impedance as an electrical characteristic of the components, A measuring unit for measuring the electrical characteristics of the aforementioned component, A processing unit that corrects the measured impedance, which is the impedance as an electrical characteristic of the component measured by the measuring unit, by at least an open-circuit correction value to obtain the final impedance of the component. Includes, An electrical characteristic acquisition device including an open-circuit correction value acquisition unit that calculates and acquires the stray admittance as an electrical characteristic measured by the measuring unit when the distance between the pair of measuring probes is a predetermined set length, the set length, and the length on the electrode side of the component, as the open-circuit correction value when the distance between the pair of measuring probes is the length on the electrode side of the component. The electrical characteristics acquisition device described in this section may employ any one of the technical features described in section (1) through (8). Furthermore, the electrical characteristic acquisition device does not necessarily need to be installed on the mounting machine and can be used independently.

[0075] (11) A method for obtaining open-circuit correction values ​​used when acquiring the electrical characteristics of a component, A measurement step in which the electrical characteristics are measured by a measuring unit when the distance between a pair of measuring probes is a predetermined set length, An open-circuit correction value acquisition step is performed to acquire the electrical characteristics when the distance between the pair of measuring probes is the length on the electrode side of the component, based on the electrical characteristics measured in the measurement step, the set length, and the length on the electrode side of the component, as the open-circuit correction value. A method for obtaining open correction values, including the method described above.

[0076] The open correction value acquisition method described in this section may employ any of the technical features described in (1) through (10).

Claims

1. An electrical characteristic acquisition device is mounted on a mounting machine that picks up components supplied by a component supply device and mounts them onto a circuit board, and acquires the electrical characteristics of the components by having a pair of measuring probes grip the components, The component is a corner chip that is generally rectangular in shape when viewed from above, and has electrodes positioned opposite each other at each of its two ends in one direction. A measuring unit for measuring the electrical characteristics of the aforementioned component, A reference stray admittance as an electrical characteristic measured by the measuring unit when the distance between the pair of measuring probes is a predetermined set length, and an open correction value acquisition unit that calculates and acquires the stray admittance as an electrical characteristic when the distance between the pair of measuring probes is the length of the part in one direction, based on the set length and the length of the part in one direction, as an open correction value. A processing unit that corrects the measured electrical characteristics, which are the electrical characteristics of the component measured by the measuring unit, with at least the open-circuit correction value acquired by the open-circuit correction value acquisition unit to obtain the final electrical characteristics of the component. An electrical characteristics acquisition device, including one.

2. The electrical characteristic acquisition device according to claim 1, which includes a storage unit that stores in advance the set length and the reference floating admittance measured by the measuring unit when the distance between the pair of measuring probes is the set length.

3. The electrical characteristic acquisition device includes an approach / separation device that moves the pair of measuring probes closer together and further apart. The electrical characteristic acquisition device according to claim 1 or 2, wherein the approach / separation device includes a fluid pressure cylinder.

4. It includes a holder that is movable between a position between the pair of measuring probes and a position away from the pair of measuring probes, and that can hold the component, The electrical characteristic acquisition device according to any one of claims 1 to 3, wherein the measuring unit measures the reference floating admittance when the distance between the pair of measuring probes is the set length and the holding base is in a position away from between the pair of measuring probes.

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