Component mounting device and electrical characteristic measurement method for component

Abstract

To provide a component mounting device capable of smoothly measuring electrical characteristics of a component, and an electrical characteristic measurement method for a component.SOLUTION: In electrical characteristic measurement method for a component, a component comprising a characteristic measuring instrument for measuring electrical characteristics of the component placed in a component placement section suctions, using a nozzle, the component being a measuring target, locates the component at a release-position which is set at an upper side of the component placement section (steps ST3 and ST4), then releases the component from the nozzle by causing the nozzle to blow air (step ST5) and placing the component in the component placement section, thereby causing the characteristic measuring instrument to measure the electrical characteristics of the component. The method comprises the steps of: storing error information on a following case, determining that an error has occurred in the case where the electrical characteristics of the component cannot be normally measured by the characteristic measuring instrument although the air blow is performed (step ST9); and, on the basis of the stored error information, changing at least one of two parameters of a height of the desorption position and a duration of the air blow (step ST11).SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a component mounting device that adsorbs components by a nozzle and mounts them on a substrate, and a method for measuring electrical characteristics of components.

Background Art

[0002] A component mounting device produces a mounted substrate by performing a component mounting operation of adsorbing a component supplied by a parts feeder by a nozzle and mounting the adsorbed component on a substrate. There are many types of components used in the production of mounted substrates, and an operator switches the types of components set in the parts feeder at a timing and in an order determined according to an execution program for operating the component mounting device. This component switching operation corresponds to an operation of replacing a reel around which a component tape is wound when the parts feeder is a tape feeder.

[0003] As long as such component switching is performed manually by an operator, it is inevitable that human errors will occur. Therefore, conventionally, some component mounting devices are equipped with a characteristic measuring instrument that measures the electrical characteristics (inductance, capacitance, and resistance) of one of the components by taking out one of the components before actually mounting the components set in the parts feeder on the substrate. (For example, Patent Document 1 below). In the characteristic measuring instrument disclosed in Patent Document 1, a component is placed on a component placement portion having a V-shaped groove shape that becomes narrower downward, and the electrical characteristics of the component are measured by sandwiching the placed component with two electrodes. When the component placement portion has a V-shaped groove shape in this way, it is possible to accommodate the placement of a plurality of types of components having different sizes in a space-saving manner, so that the characteristic measuring instrument can be configured in a compact manner.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When placing a component on a component placement section, usually, after positioning the component adsorbed on a nozzle at an upper position of the component placement section, air is blown through the nozzle to detach the component from the nozzle. As a result, the component drops and is placed on the component placement section. However, if the height for positioning the component is constant regardless of the type of the component, for a small-sized component, the distance and time until it is placed (reaches) on the component placement section become long and it is lightweight. Therefore, even if it is in a horizontal posture when detached from the nozzle, the posture changes during the fall, and an error (placement error) occurs where the measurement of electrical characteristics becomes impossible because the component is greatly tilted or its orientation is changed from the horizontal posture when placed on the component placement section.

[0006] Also, if the duration of air blowing is the same regardless of the type of the component, an error (carry-back error) occurs where, depending on the size of the component, the component cannot be completely detached from the nozzle and is carried back while still adsorbed on the nozzle. When these placement errors and carry-back errors occur, the characteristic measuring device cannot measure the electrical characteristics of that component, and it becomes necessary to adsorb the next component and retry. Therefore, there is a problem in that it takes time for the check-like measurement of electrical characteristics that should be performed quickly, and there is a risk of delaying the progress of the component mounting operation, which is the original operation of the component mounting apparatus.

[0007] Therefore, an object of the present invention is to provide a component mounting apparatus and a method for measuring electrical characteristics of a component that can smoothly measure the electrical characteristics of the component.

Means for Solving the Problems

[0008] The component mounting apparatus of the present invention includes a characteristic measuring instrument that measures the electrical characteristics of components mounted on a component placement unit, a nozzle that adsorbs a component to be measured for electrical characteristics and positions the component at a separation position set above the component placement unit, a blowing means that blows air to the nozzle that has positioned the component at the separation position to separate the component from the nozzle, and a parameter changing means that changes at least one of two parameters, namely the height of the separation position and the duration of the air blow, based on error information regarding the component that has separated from the nozzle and fallen onto the component placement unit.

[0009] The method for measuring the electrical characteristics of components of the present invention is a method for measuring the electrical characteristics of components in which a component mounting apparatus equipped with a characteristic measuring instrument that measures the electrical characteristics of components mounted on a component placement unit adsorbs a component to be measured with a nozzle and positions it at a separation position set above the component placement unit, then blows air to the nozzle to separate the component from the nozzle, and places the component on the component placement unit to cause the characteristic measuring instrument to measure the electrical characteristics of the component. When an error occurs because the electrical characteristics of the component could not be measured normally by the characteristic measuring instrument even though the air blow was performed, an error information storage step for storing that information, and a parameter changing step for changing at least one of two parameters, namely the height of the separation position and the duration of the air blow, based on the error information stored in the error information storage step.

Advantages of the Invention

[0010] According to the present invention, the measurement of the electrical characteristics of components can be performed smoothly.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

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Figure 8

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Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a component mounting apparatus 1 according to an embodiment of the present invention. The component mounting apparatus 1 is an apparatus that repeatedly executes a component mounting operation of mounting components BH on a substrate KB sent from an upstream process and carrying it out to a downstream process

[0013] The component mounting device 1 includes a substrate transfer unit 12 composed of a pair of conveyors on a base 11. The substrate transfer unit 12 transfers the substrate KB in the horizontal direction and positions it at a predetermined working position. In the present embodiment, the direction in which the substrate transfer unit 12 transfers the substrate KB (the left - right direction as viewed by the operator OP) is defined as the X - direction, the direction orthogonal to the X - direction in the horizontal plane (the front - rear direction as viewed by the operator OP) is defined as the Y - direction, and the up - down direction is defined as the Z - direction.

[0014] A feeder base 11F is provided at the Y - direction end of the base 11. A plurality of tape feeders 13 are arranged side by side in the X - direction on the feeder base 11F. The tape feeder 13 is a parts feeder that supplies the component BH using a component tape BT in which the component BH is stored. The tape feeder 13 pulls out the component tape BT wound around the reel RL and conveys it forward (i.e., toward the substrate KB positioned by the substrate transfer unit 12), and supplies the component BH to the component take - out position 13K set at the upper front part.

[0015] A head movement mechanism 14 is provided on the base 11. The head movement mechanism 14 includes a fixed beam 14a fixed to the base 11 and extending in the Y - direction, and a moving beam 14b extending in the X - direction and movable in the Y - direction with respect to the fixed beam 14a. A mounting head 15 is attached to the moving beam 14b. The head movement mechanism 14 moves the moving beam 14b in the Y - direction with respect to the fixed beam 14a and moves the mounting head 15 in the X - direction with respect to the moving beam 14b, thereby moving the mounting head 15 within the XY plane (horizontal plane).

[0016] In FIG. 3, the mounting head 15 includes a plurality of lifting shafts 16 extending downward. A nozzle 17 is attached to the lower end of each lifting shaft 16. The mounting head 15 can individually lift and lower the plurality of nozzles 17 via the lifting shafts 16 by a built - in nozzle drive mechanism 15A, and can also rotate around the vertical axis.

[0017] In FIG. 3, a nozzle conduit 21 is formed inside each nozzle 17 and the lifting shaft 16 to which the nozzle 17 is attached. Each nozzle conduit 21 is connected to a pipe 22 extending outside the lifting shaft 16. Each pipe 22 is connected to a negative pressure source 24 and a positive pressure source 25 via a control valve 23 provided outside the mounting head 15.

[0018] The control valve 23 operates to connect the nozzle conduit 21 to the negative pressure source 24 to supply negative pressure to the nozzle conduit 21, thereby generating a vacuum adsorption force at the lower end of the nozzle 17. Further, the control valve 23 operates to connect the nozzle conduit 21 to the positive pressure source 25 to supply positive pressure to the nozzle conduit 21, thereby causing an air blow to eject air from the lower end of the nozzle 17.

[0019] When a vacuum adsorption force is generated at the lower end of the nozzle 17, the mounting head 15 can adsorb the component BH to the lower end of the nozzle 17. Further, when air is ejected from the lower end of the nozzle 17, the mounting head 15 can detach the component BH adsorbed to the lower end of the nozzle 17 from the nozzle 17. Thus, in the present embodiment, the negative pressure source 24 and the control valve 23 serve as an adsorption means 26 for adsorbing the component BH to the nozzle 17, and the positive pressure source 25 and the control valve 23 serve as a blow means 27 for causing an air blow to detach the component BH from the nozzle 17 (FIG. 3).

[0020] In FIG. 3, a flow sensor 28 is interposed between the nozzle conduit 21 of each pipe 22 and the control valve 23. Each flow sensor 28 measures the flow rate of air in the corresponding nozzle conduit 21.

[0021] As shown in FIGS. 1 and 2, a characteristic measuring device 29 is attached to the feeder base 11F beside the tape feeder 13. The characteristic measuring device 29 will be described later.

[0022] As shown in FIG. 4, the control device 30 included in the component mounting device 1 includes a storage unit 30a and an operation control unit 30b. The storage unit 30a stores an execution program PG for the component mounting operation performed by the component mounting device 1 and component data BD. The component data BD includes size data and the like for each type of component BH that the component mounting device 1 plans to use, as well as data on electrical characteristics (inductance, capacitance, resistance).

[0023] The operation control unit 30b reads the execution program PG and the component data BD from the storage unit 30a, and controls the operations of each part including the substrate transfer unit 12, the tape feeder 13, the head movement mechanism 14, the nozzle drive mechanism 15A of the mounting head 15, and the control valve 23. Specifically, the operation control unit 30b causes the substrate transfer unit 12 to perform the operations of transferring and positioning the substrate KB, and causes the tape feeder 13 to supply components to the component extraction position 13K. Also, the operation control unit 30b causes the head movement mechanism 14 to perform the operation of moving the mounting head 15, and causes the nozzle drive mechanism 15A of the mounting head 15 to perform the raising and rotation of the nozzle 17. The operation control unit 30b also causes the control valve 23 to perform the adsorption and detachment (air blow) of the component BH to and from the nozzle 17.

[0024] Information on the air flow rate inside the nozzle 17 (specifically, inside the pipe 22 connected to the nozzle 17) measured by the flow rate sensor 28 is input to the control device 30 (FIG. 4). The control device 30 can identify the state in which the nozzle 17 is adsorbing the component BH and the state in which the component BH is not being adsorbed based on the air flow rate inside the nozzle 17 measured by the flow rate sensor 28.

[0025] When the component mounting operation is started in the component mounting device 1 having such a configuration, first, the substrate transfer unit 12 operates to carry in the substrate KB supplied from the upstream process and position it at the working position. When the substrate KB is positioned at the working position, a plurality of tape feeders 13 each operate to perform a component supply operation, and the head movement mechanism 14 repeatedly executes the transfer operation of the component BH to the mounting head 15.

[0026] The transfer operation of the mounting head 15 consists of a pickup operation of sucking and picking up the component BH supplied by the tape feeder 13 to the component take-out position 13K by the nozzle 17, and after the pickup operation, moving above the substrate KB and detaching the component BH from the nozzle 17 and mounting it on the substrate KB. When the mounting head 15 finishes the transfer operation, the substrate transfer unit 12 operates to carry out the substrate KB to the downstream process, and the component mounting work per one substrate KB is completed.

[0027] Next, the characteristic measuring device 29 will be described. The characteristic measuring device 29 is a device that measures the electrical characteristics of the component BH mounted on the substrate KB. When new production starts, when component depletion occurs and the component BH is replenished, when the type of the component BH is switched due to a model change, etc., the component mounting device 1 measures the electrical characteristics of the newly set component BH before it is mounted on the substrate KB, and transmits the obtained electrical characteristic data (measurement data) to the control device 30.

[0028] In FIGS. 5(a) and 5(b), the characteristic measuring device 29 includes a housing 31 that extends as a whole along the YZ plane. A T-slider 32 extending in the Y direction is provided on the lower surface of the housing 31. By inserting this T-slider 32 into the T-slider rail 11T provided on the upper surface of the feeder base 11F from the rear (FIG. 5(a) → FIG. 5(b)), the housing 31 (that is, the characteristic measuring device 29) can be attached to the feeder base 11F (FIG. 5(b)). When the housing 31 is attached to the feeder base 11F, a plug 33 provided at the lower rear part of the housing 31 fits into a socket 11S provided at the rear part of the feeder base 11F (FIG. 5(a) → FIG. 5(b)), and the characteristic measuring device 29 is in a state of being electrically and signal-transmission connected to the control device 30.

[0029] In FIGS. 6(a) and 6(b), the characteristic measuring device 29 includes a V-block 41, a fixed electrode 42, and a movable electrode 43 at the upper front of the housing 31. FIGS. 6(a) and 6(b) are a perspective view and a plan view of a portion as seen from the arrow A in FIG. 5(a), FIG. 7(a) is a cross-sectional view as seen from the arrow B-B in FIG. 6(b), and FIG. 7(b) is a cross-sectional view as seen from the arrow C-C in FIG. 7(a).

[0030] In FIGS. 6(a) and 7(b), the V-block 41 has a V-shaped groove portion having a pair of inclined surfaces 41S arranged in a V shape facing each other in the width direction (X direction) of the housing 31. This V-shaped groove portion serves as a component mounting portion 41B on which a component BH to be measured for electrical characteristics is mounted.

[0031] In FIGS. 6(a), 6(b), and 7(a), a fixed electrode holding block 44 is arranged in front of the V-block 41, and the fixed electrode 42 is held on the upper part of the fixed electrode holding block 44 in a posture extending in the Y direction. The rear end surface 42M of the fixed electrode 42 is located at a position coinciding with the rear surface 44M of the fixed electrode holding block 44 and is exposed on the V-block 41 side. The fixed electrode holding block 44 is fixed to the housing 31, and the fixed electrode 42 is immovable with respect to the housing 31.

[0032] In FIGS. 6(a), 6(b), and 7(a), a movable electrode holding block 45 is arranged behind the V-block 41. The movable electrode 43 is held on the upper part of the movable electrode holding block 45 in a posture extending in the Y direction. The front portion of the movable electrode 43 forms a protruding portion 43T protruding in front of the movable electrode holding block 45. The front end surface 43M of the protruding portion 43T is located in front of the front surface 45M of the movable electrode holding block 45.

[0033] In FIG. 6(a), the protruding portion 43T of the movable electrode 43 has an inverted triangular shape with two V-shaped surfaces along the pair of inclined surfaces 41S of the V-block 41. The apex portion at the lower end of the front end surface 43M of the protruding portion 43T is located near the bottom of the V of the V-block 41.

[0034] In FIG. 6(b), the fixed electrode 42 and the movable electrode 43 are connected to a measurement circuit 46 provided in the housing 31. The measurement circuit 46 is a circuit that measures the electrical characteristics of the component BH placed on the component mounting portion 41B. When the fixed electrode 42 and the movable electrode 43 are each in contact with two electrodes provided in the component BH, the measurement circuit 46 starts measuring the electrical characteristics of the component BH.

[0035] The V-block 41 and the movable electrode holding block 45 are each movable in the Y direction behind the fixed electrode holding block 44 (proximable and separable with respect to the fixed electrode holding block 44). The V-block 41 is connected to a V-block moving actuator 41K composed of a cylinder or the like, and the movable electrode 43 (directly, the movable electrode holding block 45) is connected to a movable electrode moving actuator 43K composed of a cylinder or the like (FIG. 7(a)). The V-block 41 moves the V-block moving actuator 41K in the Y direction, and the movable electrode 43 is moved in the Y direction by the movable electrode moving actuator 43K. The control device 30 controls the operations of the V-block moving actuator 41K and the movable electrode moving actuator 43K respectively (FIG. 4).

[0036] When causing the characteristic measuring device 29 to measure the electrical characteristics of the component BH, the control device 30 adsorbs the component BH to be measured to the nozzle 17, then moves the mounting head 15, and positions the component BH above the component mounting portion 41B. When the component BH is positioned above the component mounting portion 41B, the nozzle 17 is rotated so that the two electrodes (component electrodes BHD) of the component BH are aligned in the Y direction (FIG. 6(a)). After adjusting the posture of the component BH, the nozzle 17 is lowered to position the component BH at a position (detachment position RP) where the height H of the bottom surface of the component BH (here, the downward distance from the upper surface of the V-block 41) becomes a predetermined detachment height L (FIGS. 8(a) and 9(a)). Note that FIGS. 8(a) and 9(b) show examples in which the sizes of the component BH are different from each other.

[0037] The separation height L, which is the height H of the bottom surface of the component BH at the separation position RP, is a value that can vary depending on changes in the parameters described later and also varies depending on the size (type) of the component BH. However, as an initial value, it is set as a common value regardless of the size of the component BH (see FIGS. 8(a) and 9(a)). The data of this separation height L is stored in the storage unit 30a.

[0038] When the control device 30 positions the component BH at a height where the height H of its bottom surface becomes the separation height L (FIGS. 8(a) and 9(a)), it causes the nozzle 17 to blow air at that position. As a result, the component BH receives a downward biasing force from the air BA ejected from the nozzle 17, detaches from the nozzle 17, and falls downward to be placed on the component placement portion 41B of the characteristic measuring device 29 (FIGS. 8(b), 9(b), and 10(a)).

[0039] When the component BH is placed on the component placement portion 41B in an ideal posture, as shown in FIGS. 8(b) and 9(b), the component BH is in a substantially horizontal posture. However, even if it is slightly tilted from the horizontal posture, the component BH can be placed on the pair of inclined surfaces 41S. Near the lower end portions (near the bottom of the V shape) of each of the pair of inclined surfaces 41S, they are formed in a stepped shape, so that even a component BH with a small size can be placed in a horizontal posture.

[0040] After a certain time has elapsed since the component BH is detached from the nozzle 17, the control device 30 operates the movable electrode moving actuator 43K to move the movable electrode 43 forward (FIG. 10(a) → FIG. 10(b)), and stops the movement of the movable electrode 43 when the component BH pushed forward by the front end surface 43M of the protruding portion 43T (the front-side component electrode BHD) comes into contact with the fixed electrode 42. As a result, the component BH is in a state of being sandwiched between the fixed electrode 42 and the movable electrode 43 (FIG. 10(b)).

[0041] When the fixed electrode 42 and the movable electrode 43 come into contact with the two electrodes (component electrodes BHD) of component BH in this way, the measurement circuit 46 starts measuring the electrical characteristics of component BH. When the measurement of the electrical characteristics of component BH is completed, the measurement circuit 46 transmits the data obtained by the measurement (electrical characteristic data of component BH) to the control device 30.

[0042] In FIG. 4, the control device 30 includes a determination unit 30c and a parameter change unit 30d in addition to the aforementioned storage unit 30a and operation control unit 30b. When the electrical characteristic data of component BH is sent from the characteristic measuring device 29, the determination unit 30c receives the sent electrical characteristic data as measurement data, and reads out the electrical characteristic data of component BH corresponding to that component BH from the component data BD in the storage unit 30a with reference to the execution program PG, and uses this as the reference data. Then, the measurement data is compared with the reference data to determine whether the measurement data and the reference data match (whether the measurement data is within a certain allowable value based on the reference data).

[0043] When the determination unit 30c determines that the measurement data and the reference data match, the operation control unit 30b executes the component mounting operation assuming that there is no error in the type of component BH set. On the other hand, when the determination unit 30c determines that the measurement data and the reference data do not match, the operation control unit 30b assumes that there is an error in the type of component BH set, and without executing the component mounting operation (or interrupting the component mounting operation), notifies the operator OP of a warning that the correct component BH should be reset.

[0044] The determination unit 30c also determines that an error (an error whose content is that the electrical characteristics of component BH were not measured normally or the measurement itself was not performed) has occurred when it detects that the measurement data received from the characteristic measuring device 29 shows an obviously abnormal value. When the determination unit 30c determines that such an error has occurred, the operation control unit 30b does not execute the component mounting operation, adsorbs the next component BH, retries the measurement of the electrical characteristics, and performs an operation to identify the type of the occurred error.

[0045] The types of errors in which the measurement data shows clearly abnormal values include placement errors and carry-back errors. A placement error occurs when the component BH that has fallen off the nozzle 17 is greatly tilted on the component placement section 41B (Fig. 11(a)) or its orientation has changed significantly (Fig. 11(b)), so that the component BH cannot be clamped in a normal posture by the fixed electrode 42 and the movable electrode 43. A carry-back error occurs when the operation to detach the component BH from the nozzle 17 (air blow) has been performed, but the component BH remains attached to the nozzle 17.

[0046] When the determination unit 30c determines that an error has occurred, in order to identify the type of the error, it causes the nozzle 17 that has adsorbed the component BH that is the target of the error to perform an air suction operation, and examines the air flow rate detected by the flow rate sensor 28. As a result, when the detected air flow rate is much lower than the reference value (the standard air flow rate that can be obtained when the nozzle 17 is not adsorbing the component BH), it can be known that the nozzle 17 is adsorbing the component BH, and from this, the type of error that has occurred can be identified as a carry-back error. On the other hand, when the air flow rate detected by the flow rate sensor 28 is at the reference value level, it can be known that the component BH has been detached from the nozzle 17, and the cause of the error is due to the abnormal placement state of the component BH in the component placement section 41B. Therefore, the type of error that has occurred can be identified as a placement error.

[0047] Note that the component BH that has been the object of electrical characteristic measurement by the characteristic measuring instrument 29 as described above is discarded regardless of the measurement result. The discarded component BH is discarded by the control device 30 operating the V-block moving actuator 41K and the movable electrode moving actuator 43K to move both the V-block 41 and the movable electrode 43 backward. Thereby, the component BH clamped by the fixed electrode 42 and the movable electrode 43 falls downward from the recovery passage 47 (Fig. 7(a)) and is accommodated in a recovery box (not shown).

[0048] Based on the error information regarding the component mounting part 41B of the component BH that has detached from the nozzle 17 and fallen (whether the type of error that occurred is a mounting error or a carry - away error, and furthermore, what is the occurrence frequency of these errors), the parameter changing unit 30d changes at least one of the two parameters: the height of the detachment position RP (detachment height L) and the duration of the air blow.

[0049] For example, as a result of aggregating the occurrence frequencies of the errors that occurred for each type and taking statistics, if it is found that the occurrence frequency of the mounting error tends to be high, the parameter changing unit 30d increases the detachment height L (the height of the detachment position RP). Thereby, the distance and time from when the component BH detaches from the nozzle 17 until it reaches the component mounting part 41B can be shortened. So, the probability that the posture and orientation of the component BH that has detached from the nozzle 17 change significantly before reaching the component mounting part 41B is reduced, and the occurrence frequency of the mounting error decreases. Also, if it is found that the occurrence frequency of the carry - away error tends to be high, the parameter changing unit 30d increases the duration of the air blow. Thereby, the probability that the component BH detaches from the nozzle 17 is increased, and the occurrence frequency of the carry - away error decreases.

[0050] The parameter changing unit 30d changes the parameters (detachment height L and duration of the air blow) for each type of component BH. Therefore, even when there are many types of component BH, fine control (control when detaching the component BH from the nozzle 17) according to the type (especially the size) of the component BH can be performed, and it becomes difficult for both the mounting error and the carry - away error to occur themselves. Thereby, when an error occurs, the frequency of adsorbing the next component BH and retrying can be reduced, and the inconvenience that the progress of the component mounting operation, which is the original operation of the component mounting apparatus 1, is delayed because it takes time for the measurement of the check - like electrical characteristics that should be performed quickly is eliminated.

[0051] Next, using the flowchart of FIG. 12, the measurement procedure (component electrical characteristic measurement method) of the electrical characteristics of component BH performed by component mounting device 1 will be described. The control device 30 of component mounting device 1 monitors the occurrence of events such as component replacement while executing the execution program PG, and determines whether it is necessary to measure (LCR measurement) the electrical characteristics of component BH (whether an event that requires LCR measurement has occurred) (step ST1. First determination step). And when it is determined that LCR measurement is necessary, correct electrical characteristic data of component BH is read out in accordance with the execution program PG, and two parameters, the separation height L defined at that time and the duration of air blow, as parameters when detaching component BH from nozzle 17, are read out from storage unit 30a (step ST2. Parameter reading step).

[0052] After the control device 30 reads out the two parameters, it adsorbs the component BH to be measured and takes it out from the tape feeder 13 (step ST3. Component adsorption step), moves it above the component placement unit 41B of the characteristic measuring device 29, and then lowers the nozzle 17 to position the component BH at a predetermined height (step ST4. Positioning step). At this time, the height of the component BH to be positioned is set to the height corresponding to the parameter (separation height L) read out in step ST2.

[0053] After the control device 30 positions the component BH to be measured above the component placement unit 41B, it causes the nozzle 17 to be subjected to air blow by the blowing means 27 (step ST5. Air blow step), and detaches the component BH from the nozzle 17. The duration of the air blow performed at this time is set to the time corresponding to the parameter (duration of air blow) read out in step ST2.

[0054] When the control device 30 causes the nozzle 17 to perform air blowing to separate the component BH from the nozzle 17, it then causes the characteristic measuring device 29 to measure the electrical characteristics (step ST6. LCR measurement process). When the LCR measurement by the characteristic measuring device 29 is completed and measurement data is sent from the characteristic measuring device 29, the control device 30 determines whether an error has occurred in the LCR measurement based on whether an abnormality is recognized in the measurement data (step ST7. Second determination process). As a result, if it is determined that no error has occurred, it is considered that the LCR measurement of the component BH has been successful, and the process returns to step ST1 to newly start monitoring for the occurrence of an event. On the other hand, if it is determined in step ST7 that an error has occurred in the LCR measurement, after specifying the type of the occurred error in the above-described manner (step ST8. Error type specifying process), the information on the specified error type is stored in the storage unit 30a as error information (step ST9. Error information storage process).

[0055] After the control device 30 stores the error information in the storage unit 30a, it determines whether the total number of error occurrences has reached a predetermined reference number (step ST10. Third determination process). If the total number of error occurrences has not reached the predetermined reference number, the process returns to step ST3 without changing the parameters to perform component adsorption for the next trial. If the total number of error occurrences has reached the reference number in step ST10, the parameter changing unit 30d changes the parameters based on the above-described manner (step ST11. Parameter changing process). Then, after changing the parameters, the process returns to step ST1 to newly start monitoring for the occurrence of an event.

[0056] As described above, the component mounting device 1 in this embodiment includes a characteristic measuring instrument 29 that measures the electrical characteristics of the component BH placed on the component placement section 41B, a nozzle 17 that adsorbs the component BH whose electrical characteristics are to be measured and positions the component BH at a separation position RP set above the component placement section 41B, a blowing means 27 that causes an air blow to be performed on the nozzle 17 with the component BH positioned at the separation position RP to separate the component BH from the nozzle 17, and a parameter changing section 30d as a parameter changing means that changes at least one of two parameters, i.e., the height of the separation position RP (separation height L) and the duration of the air blow, based on error information regarding the component BH that has separated from the nozzle 17 and fallen onto the component placement section 41B.

[0057] When measuring the electrical characteristics of the component BH, the component mounting device 1 adsorbs the component BH to be measured with the nozzle 17 and positions it at the separation position RP set above the component placement section 41B (steps ST3 and ST4). Then, an air blow is performed on the nozzle 17 to separate the component BH from the nozzle 17 (step ST5), and the component BH is placed on the component placement section 41B so that the characteristic measuring instrument 29 can measure the electrical characteristics of the component BH. If an error occurs when the electrical characteristics of the component BH cannot be normally measured by the characteristic measuring instrument 29 despite the air blow being performed, the information is stored (step ST9). Based on the stored error information, at least one of two parameters, i.e., the height of the separation position (separation height L) and the duration of the air blow, is changed (step ST11).

[0058] In the component mounting device 1 and the method for measuring the electrical characteristics of the component BH in this embodiment, based on the error information regarding the component mounting portion 41B of the component BH that has fallen off and dropped from the nozzle 17, at least one of the two parameters, namely the height of the detachment position RP (detachment height L) and the duration of the air blow, is changed. Therefore, even if an error occurs in the characteristic measuring device 29, the parameters are automatically changed so as to improve this situation. For this reason, even if an error occurs once or continuously several times at first, this will gradually be corrected, and finally the frequency of error occurrence will become extremely low, enabling stable measurement of the electrical characteristics of the component BH. Thus, according to the component mounting device 1 and the method for measuring the electrical characteristics of the component BH in this embodiment, the electrical characteristics of the component BH can be carried out smoothly, and it is possible to prevent the occurrence of artificial mistakes during the replacement of the component BH and the like that may occur when the operator OP performs it manually.

[0059] As described above, in the component mounting device 1 and the method for measuring the electrical characteristics of the component BH in this embodiment, even if an error occurs in the characteristic measuring device 29, this will gradually be corrected, and the electrical characteristics of the component BH can be carried out smoothly.

[0060] Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described ones, and various modifications and the like are possible. For example, in the above-described embodiment, the parts feeder is assumed to be the tape feeder 13, but this is just an example, and the parts feeder is not limited to the tape feeder 13, and it may be a tray feeder, a stick feeder, or the like.

[0061] Also, in the above-described embodiment, the component mounting portion 41B formed in the V-shaped block 41 has a V-shaped in a side view, but as long as it has a shape that becomes narrower downward, it does not necessarily have to be V-shaped. Also, in the above-described embodiment, the detachment height L is assumed to be the downward distance from the upper surface of the V-shaped block 41, but this is just an example, and it may be the upward height from the lowest part of the V-shape or the like.

[0062] Also, in the above-described embodiment, the parameter change unit 30d records the occurrence state of errors, takes statistics, grasps the occurrence frequency for each error type, and when it determines that it is better to change the parameter (in the above embodiment, when the cumulative number of occurrences of errors for each type reaches a predetermined reference number), it changes the parameter. However, it may be configured to change the parameter every time an error occurrence is detected by the determination unit 30c (that is, without taking statistics).

Industrial Applicability

[0063] Provided are a component mounting device and a method for measuring electrical characteristics of a component that can smoothly measure electrical characteristics of a component.

Explanation of Signs

[0064] 1 Component mounting device 13 Tape feeder 14 Head movement mechanism 15 Mounting head 17 Nozzle 27 Blowing means 28 Flow rate sensor 29 Characteristic measuring instrument 30 Control device 30c Determination unit 30d Parameter change unit (change means) 41 V-block 41B Component placement part 42 Fixed electrode 43 Movable electrode 46 Measurement circuit RP Release position BH Component

Claims

1. A characteristic measuring instrument for measuring the electrical characteristics of components placed on a component placement section, a nozzle that adsorbs a component to be measured for electrical characteristics and positions the component at a detachment position set above the component placement section, a blowing means for causing air blowing to the nozzle that has positioned the component at the detachment position to detach the component from the nozzle, parameter changing means for changing at least one of two parameters, namely the height of the detachment position and the duration of the air blowing, based on error information regarding the component that has detached from the nozzle and fallen onto the component placement section, A component mounting apparatus comprising the above.

2. The component mounting apparatus according to claim 1, wherein the component placement section has a groove shape that narrows in width downward.

3. The component mounting apparatus according to claim 1, wherein the groove shape is a V shape.

4. The component mounting apparatus according to claim 1, wherein the parameter changing means changes at least one of the height of the detachment position and the duration of the air blowing for each type of component to be measured.

5. A method for measuring the electrical characteristics of a component, in which a component mounting apparatus equipped with a characteristic measuring instrument for measuring the electrical characteristics of components placed on a component placement section adsorbs a component to be measured with a nozzle and positions it at a detachment position set above the component placement section, then causes air blowing to the nozzle to detach the component from the nozzle, and places the component on the component placement section to cause the characteristic measuring instrument to measure the electrical characteristics of the component. The method includes: an error information storage step of storing information assuming that an error has occurred when the electrical characteristics of the component cannot be measured normally by the characteristic measuring instrument despite the air blowing being performed; a parameter changing step of changing at least one of two parameters, namely the height of the detachment position and the duration of the air blowing, based on the error information stored in the error information storage step; A method for measuring the electrical characteristics of a component having the above.

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