JP7546147B2 - Measuring equipment and component placement machines - Google Patents

Description

The present invention relates to a measuring device and a component mounting machine.

Measuring devices are used, for example, to measure the external dimensions and deformation of a part of a measurement object. Patent Document 1 discloses a configuration in which a measuring device is applied to a component mounting machine that mounts components on a board. The measuring device in Patent Document 1 irradiates the measurement object with parallel light and obtains the width of the light-blocked part as a measurement value. The measuring device in Patent Document 1 also includes a tilting device that enables the measurement object to be irradiated with parallel light at multiple irradiation angles. This makes it possible to improve measurement accuracy in response to the tilt of the measurement object.

International Publication No. 2020/070880

In a measuring device configured as described above, if an abnormality occurs in the tilting due to, for example, a foreign object being mixed into the moving part of the tilting device, an error may occur between the specified irradiation angle and the actual irradiation angle. Therefore, it is required that the measuring device maintains proper measurement operation.

The present specification aims to provide a measuring device capable of detecting operational abnormalities in a tilting device, and a component mounting machine equipped with the measuring device.

This specification discloses a measuring device that includes a light-projecting unit that irradiates light onto a measurement object, a tilting device that tilts the light-projecting unit to change the irradiation angle of the light irradiated by the light-projecting unit with respect to the measurement object, a measuring unit that measures the length of the range of the irradiated light that is blocked or reflected by the measurement object, a contour determining unit that determines whether the contour of the measurement object is correct or not based on a plurality of measurement values obtained by the measuring unit at each of a plurality of the irradiation angles changed within a predetermined angle range by tilting using the tilting device, and a detection unit that detects an abnormal operation of the tilting device when an amount of change in the plurality of measurement values is not within an allowable range set based on the designed contour of the measurement object and the angle range of the plurality of the irradiation angles.

With this configuration, it is possible to determine whether the external shape of the object to be measured is correct based on multiple measured values, and to detect the presence or absence of operational abnormalities in the tilting device based on the amount of change in the multiple measured values used in the determination. This makes it possible to prevent measurement errors caused by operational abnormalities in the tilting device and maintain proper measurement operations.

FIG. 2 is a plan view showing a schematic diagram of a component mounting machine including a measuring device. FIG. FIG. 4 is a rear view showing a main part of the measuring device including a tilting device. 1 is a block diagram showing a configuration of a component mounting machine including a measuring device; 4 is a side view showing a lead component held by a holding member. FIG. 11 is a diagram showing a state in which the measurement object is irradiated with irradiation light at a predetermined angle during measurement operation. FIG. 13 is a diagram showing a state in which the irradiation angle of the irradiation light coincides with the tilt angle of the measurement object due to tilting by the tilting device during measurement operation. FIG. 1 is a flowchart showing a measurement process using a measurement device.

An embodiment of the measuring device will be described with reference to the drawings. The measuring device 20 is mounted on a component mounting machine 10 that mounts components on a board 80, for example, and is used to measure the external dimensions and deformation amount of a part of a measurement target.

1. Configuration of the component mounting machine 10 The component mounting machine 10 constitutes a production line for producing board products together with a plurality of types of substrate-related operation machines including, for example, other component mounting machines 10. The substrate-related operation machines constituting the production line may include a printing machine, an inspection device, a reflow furnace, and the like.
1, the component mounting machine 10 includes a board transport device 11. The board transport device 11 sequentially transports the board 80 in a transport direction, and positions the board 80 at a predetermined position within the machine.

The component mounting machine 10 is equipped with a component supplying device 12. The component supplying device 12 supplies components to be mounted on the board 80. The component supplying device 12 is equipped with a feeder 122 in each of a plurality of slots 121. The feeder 122 is, for example, a tape feeder that feeds and moves a carrier tape containing a large number of components, thereby supplying the components so that they can be picked.

In addition, the component supply device 12 supplies relatively large electronic components, such as lead components, arranged on a tray 123. The component supply device 12 stores multiple trays 123 in a storage shelf 124 that is partitioned in the vertical direction, and pulls out a specific tray 123 according to the mounting process to supply electronic components such as lead components.

The component mounting machine 10 is equipped with a component transfer device 13. The component transfer device 13 transfers the components supplied by the component supply device 12 to a predetermined mounting position on the board 80. The component transfer device 13 is equipped with a head drive device 131, a movable table 132, a mounting head 133, and a suction nozzle 134. The head drive device 131 moves the movable table 132 in the horizontal direction (X direction and Y direction) by a linear motion mechanism. The mounting head 133 is removably fixed to the movable table 132 by a clamp member (not shown), and is arranged to be movable horizontally within the machine.

The mounting head 133 supports multiple suction nozzles 134 that are rotatable and movable up and down. The suction nozzles 134 pick up and hold the components 92 supplied by the feeder 122. The suction nozzles 134 use the supplied negative pressure air to pick up the components supplied by the feeder 122. A chuck that holds the components by gripping them may be used as a member attached to the mounting head 133 to hold the components.

The component mounting machine 10 is equipped with a component camera 14 and a board camera 15. The component camera 14 and the board camera 15 are digital imaging devices having imaging elements such as CMOS. The component camera 14 and the board camera 15 capture images based on a control signal and send image data acquired by the capture. The component camera 14 is configured to be able to capture images of the component held by the suction nozzle 134 from below. The board camera 15 is mounted on a moving stage 132 so as to be movable horizontally integrally with the mounting head 133. The board camera 15 is configured to be able to capture images of the board 80 from above.

In addition to imaging the surface of the substrate 80, the substrate camera 15 can also image various devices within the movable range of the movable stage 132. For example, in this embodiment, the substrate camera 15 can image a reference mark 27 provided on the upper part of the measuring device 20 by placing it within the camera's field of view as shown in Figure 4. In this way, the substrate camera 15 can be used to image different imaging targets in order to obtain image data to be used for various image processing.

As shown in Figure 1, the component mounting machine 10 is equipped with a control device 16. The control device 16 is mainly composed of a CPU, various memories, a control circuit, and a storage device. The control device 16 stores various data such as a control program used to control the mounting process. The control program indicates the mounting position, mounting angle, and mounting order of the components to be mounted on the board 80 during the mounting process.

The control device 16 executes a process for recognizing the holding state of the components held by each of the multiple suction nozzles 134. Specifically, the control device 16 processes image data acquired by imaging with the component camera 14, and recognizes the position and angle of each component relative to the reference position of the mounting head 133. In addition, depending on the type of component, for example, the control device 16 may determine whether the component is a normal component suitable for mounting processing or a defective component unsuitable for mounting processing based on the results of measurement processing using the measuring device 20.

The control device 16 controls the component mounting operation by the mounting head 133 based on the control program to execute the mounting process. Here, the mounting process includes a process of repeating a PP cycle (pick-and-place cycle) including a picking operation and a mounting operation multiple times. The above-mentioned "picking operation" is an operation of picking up a component supplied by the component supply device 12 with the suction nozzle 134.

2. Configuration of the measuring device 20 As shown in Fig. 2, the measuring device 20 includes a base 21 that supports a device main body. The base 21 includes a mounting frame 22 that is detachably fixed to the component mounting machine 10. The base 21 includes a tilting device 30. A light projecting unit 23 that projects light onto the measurement target and a light receiving unit 24 are fixed to the upper portion of the tilting device 30 in a predetermined positional relationship. In this embodiment, the light projecting unit 23 projects parallel light 25 having a predetermined width in the vertical direction in a direction parallel to the upper surface of the tilting device 30. The vertical width of the parallel light 25 is set to be wider than the external dimension of the measurement target in the vertical direction.

In addition, the parallel light 25 irradiated from the light projector 23 has its optical path bent by a plurality of optical members 26 so that it passes through the measurement area and reaches the light receiver 24. The optical members 26 are, for example, mirrors or prisms. The light receiver 24 receives the part of the irradiated light (parallel light 25) irradiated by the light projector 23 that is not blocked by the measurement object. In other words, when the measurement object is inserted into the measurement area, the light receiving state of the light receiver 24 changes.

The light receiving unit 24 receives at least a portion of the parallel light 25 using an imaging element such as a CMOS, and outputs an electrical signal according to the range of the received light. The light receiving unit 24 may also focus the irradiated light (parallel light 25) with a lens and output an electrical signal according to its brightness. This allows the measurement unit 51 of the measurement control device 50, which will be described later, to measure the external dimensions of the measurement object, as well as the amount of deformation or tilt angle in the vertical direction of the measurement object, based on the electrical signal input from the light receiving unit 24.

The upper surface of the measuring device 20 is provided with a plurality of reference marks 27 that are in a specified positional relationship with the parallel light 25 in the measurement area. In detail, the plurality of reference marks 27 are provided above the two optical members 26, and indicate the direction of the optical path of the parallel light 25 in the measurement area located between the two optical members 26. The control device 16 of the component mounting machine 10 acquires the position of the parallel light 25 irradiated in the measuring device 20 based on the image data acquired by imaging the plurality of reference marks 27 with the board camera 15, and the position of the board camera 15 at the time of imaging.

The tilting device 30 of the measuring device 20 tilts the light-projecting unit 23 so as to change the irradiation angle of the light (parallel light 25) emitted by the light-projecting unit 23 with respect to the measurement object. In this embodiment, the tilting device 30 is configured to tilt the light-projecting unit 23 and the light-receiving unit 24 together. Specifically, the tilting device 30 includes a holding member 31, a bracket 32, an angle adjustment unit 33, and a drive unit 40. The holding member 31 holds the light-projecting unit 23 and the light-receiving unit 24 in a predetermined positional relationship.

As shown in Figure 3, the holding member 31 and the bracket 32 are supported on the base 21 via an axis 34 so as to be able to tilt together in the vertical direction. The angle adjustment unit 33 is provided between the holding member 31 and the bracket 32 in the vertical direction. The angle adjustment unit 33 is formed, for example, of a bolt and a nut, and maintains the angle of the holding member 31 relative to the bracket 32. The angle adjustment unit 33 is configured so that the angle of the holding member 31 relative to the bracket 32 can be adjusted according to the amount of rotation by rotating the bolt relative to the nut.

The drive unit 40 is a unit that tilts the holding member 31. The drive unit 40 includes a motor 41, a cam 42, and a cam follower 43. The motor 41 is provided on the base 21. The motor 41 is a stepping motor or a servo motor that has a rotation angle sensor that detects the rotation angle, and is driven to rotate in response to the power supplied. The rotational drive force output by the motor 41 is reduced through a plurality of gears 44 and transmitted to the cam 42.

The cam 42 is rotatably mounted on the base 21, and has a cam surface 421 formed on its outer circumferential surface. An eccentric cam, an elliptical cam, or the like can be used as the cam 42. The cam follower 43 is directly or indirectly mounted on the holding member 31, and contacts the cam surface 421 of the cam 42. In this embodiment, the cam follower 43 is indirectly mounted on the holding member 31 via the bracket 32. The cam follower 43 is pressed toward the cam 42 by the weight of the holding member 31, and is constantly in contact with the cam surface 421.

The drive unit 40 reciprocates the cam follower 43 in the vertical direction, which is the tilt direction of the holding member 31, by rotating the cam 42, and tilts the holding member 31 and the bracket 32 in a vertical reciprocating manner around the shaft 34 as a fulcrum. In the measurement operation, the drive unit 40 supplies power to the motor 41 so that the cam 42 rotates once, for example based on the output signal of the rotation angle sensor of the motor 41. As a result, the holding member 31 tilts once in the vertical direction from the initial angle before tilting, returns to the initial angle and is stopped.

4, the measuring device 20 includes a measurement control device 50 that controls the operation of the light projecting unit 23, the light receiving unit 24, and the drive unit 40. The measurement control device 50 is mainly composed of a CPU, various memories, a control circuit, and a storage device. The measurement control device 50 executes a measurement process to measure the external dimensions of the measurement target based on a command input from, for example, the control device 16 of the component mounting machine 10.

In the above measurement process, first, parallel light 25 is output from the light-projecting unit 23, and the parallel light is irradiated onto the measurement object in the measurement area. Then, in this state, the tilting device 30 is operated to change the irradiation angle of the parallel light 25 with respect to the measurement object, and the measurement value at each irradiation angle is obtained from the light-receiving unit 24. This measurement value corresponds to the width of the portion of the parallel light 25 that is blocked by the measurement object. The measurement control device 50 measures the external dimensions of the measurement object in the vertical direction based on the minimum value of the fluctuating measurement values.

Here, the measurement process as described above is performed, for example, when the component to be mounted on the board 80 in the mounting process is a lead component 90, in order to inspect whether the external shape of the lead component 90 is normal. As shown in FIG. 5, the lead component 90 has a number of leads 92 arranged side by side on two or four sides of a rectangular component body 91. The measurement target is the lead row 95 of the lead component 90 (the number of leads 92 arranged in a row).

The control device 16 of the component mounting machine 10 moves the mounting head 133 so that the lead row 95 of the lead component 90 held by the suction nozzle 134 is positioned in the measurement area of the measuring device 20, and commands the measuring device 20 to perform a measurement process. Based on the results of the measurement process, the control device 16 then inspects the external shape of the lead component 90 in the mounting process, in particular the flatness of the lead row 95. If the flatness of the lead row 95 is not within the acceptable range, the control device 16 determines that some of the multiple leads 92 of the lead component 90 cannot be electrically joined to the board 80, and that the component is unsuitable for mounting.

As shown in FIG. 4, the measurement control device 50 includes a measurement unit 51 and an external shape determination unit 52. The measurement unit 51 measures the length of the range of the irradiated light that is blocked or reflected by the measurement object. In this embodiment, the measurement unit 51 measures the length of the range of the parallel light 25 that is blocked by the lead row 95 based on the light receiving state of the light receiving unit 24, as shown in FIG. 6 and FIG. 7. In addition, the measurement unit 51 may additionally measure the deformation amount or tilt angle of the measurement object (lead row 95) in a specified direction (up and down in this embodiment) based on the external dimensions obtained by measurement.

The external shape determination unit 52 determines whether the external shape of the measurement object is correct or not based on multiple measurement values acquired by the measurement unit 51 at each of multiple irradiation angles changed within a predetermined angle range by tilting the tilting device 30. More specifically, the external shape determination unit 52 acquires the minimum value of the multiple measurement values as the external dimension of the measurement object. The external shape determination unit 52 determines whether the external shape of the measurement object is correct or not based on the acquired external dimensions.

In the measuring device 20 configured as described above, if an abnormality occurs in the tilting due to, for example, a foreign object being mixed in the movable part of the tilting device 30, an error may occur between the specified irradiation angle and the actual irradiation angle. Specifically, if a foreign object is sandwiched between the base 21 and the bracket 32 and the cam follower 43 separates from the cam surface 421 of the cam 42, an abnormality occurs in the tilting. In this case, even if the drive unit 40 is operated, the angle of the holding member 31 does not change, and as a result, the irradiation angle of the parallel light 25 with respect to the measurement object does not change.

In this way, if an abnormality occurs in the tilting by the tilting device 30, it is expected that the external shape determination unit 52 will erroneously determine that a normal measurement target is defective, or conversely, erroneously determine that a defective measurement target is normal. For this reason, it is required that the measuring device 20 maintains proper measurement operation. In response to this, for example, it is conceivable to provide a sensor that detects the tilting of the holding member 31 relative to the base 21, but there is a concern that the cost of adding an additional sensor, etc. will increase.

Therefore, the measuring device 20 of this embodiment employs a configuration capable of detecting an operational abnormality of the tilting device 30 using multiple measured values acquired when the measurement process is executed. Specifically, the measurement control device 50 of the measuring device 20 includes a detection unit 53, as shown in FIG. 4. The detection unit 53 detects an operational abnormality of the tilting device 30 when the amount of change in the multiple measured values is not within an acceptable range set based on the designed outer shape of the measurement object and the angle range of the multiple irradiation angles. The above "amount of change in the multiple measured values" refers to the difference between the maximum and minimum values of the multiple measured values.

The detection means of the detection unit 53 utilizes the fact that when an abnormality occurs in the tilting by the tilting device 30, the irradiation angle of the parallel light 25 with respect to the measurement object does not change or the amount of change becomes small, and the amount of change in the acquired measurement values becomes zero or is smaller than the expected amount of change. However, since it is similarly expected that the amount of change in the multiple measurement values will be small when the measurement object has an abnormal shape, the detection unit 53 determines whether the operation of the tilting device 30 is normal or abnormal depending on whether the amount of change is within the acceptable range.

Here, in this embodiment, the tolerance is set to a range from the ideal amount of change to the ideal amount of change multiplied by a predetermined coefficient. The above "ideal amount of change" is the amount of change in multiple measurement values obtained by the measurement unit 51 when parallel light 25 is irradiated at multiple irradiation angles to a measurement object having a designed outer shape. In other words, the ideal amount of change is the theoretical amount of change obtained when it is assumed that a measurement process is performed on a measurement object having an ideal outer shape.

The above-mentioned predetermined coefficient is set as a ratio to the ideal change amount so that the change amount obtained when the measurement process is performed on a measurement target with an assumed abnormal outer shape is within the tolerance range. For example, the predetermined coefficient is set based on the ratio between the change amount of multiple measured values obtained by the measurement unit 51 when the measurement target has an abnormal outer shape (i.e., an outer shape in which a part of the measurement target is deformed by a first deformation amount equal to the design outer dimension) in a specified direction (up and down in this embodiment) and the ideal change amount when the irradiation light is irradiated at multiple irradiation angles. The predetermined coefficient K may be set to a number between 0.1 and 0.9.

3. Measurement Processing by Measuring Device 20 The measurement processing by measuring device 20 configured as described above will now be described. In the mounting process, control device 16 of component mounting machine 10 causes suction nozzle 134 to pick up lead component 90 from tray 123, and then captures an image of lead component 90 from below with component camera 14. Then, control device 16 recognizes the holding state of lead component 90 by suction nozzle 134, including the position of lead component 90 and the angle with respect to the central axis of suction nozzle 134.

Based on the holding state of the lead component 90 and the installation position of the measuring device 20, the control device 16 moves the mounting head 133 so that the lead row 95 on one side of the lead component 90 falls within the measurement area of the measuring device 20. In this state, the control device 16 commands the measuring device 20 to execute a measurement process. As a result, the measuring device 20 executes the measurement process as shown in FIG. 8.

The measurement control device 50 of the measuring device 20 executes a measurement operation (S11). This measurement operation outputs parallel light 25 from the light projecting unit 23 and rotates the motor 41 of the drive unit 40 to rotate the cam 42 once. As a result, the light projecting unit 23 and the light receiving unit 24 installed on the holding member 31 tilt back and forth once around the axis 34 as a fulcrum while maintaining a predetermined positional relationship.

At this time, the measurement unit 51 captures the light receiving signal of the light receiving unit 24 at each of the multiple irradiation angles changed within the predetermined angle range Ar by tilting the tilting device 30. As a result, the measurement unit 51 obtains the measurement value V of the width of the portion of the parallel light 25 at each of the multiple irradiation angles that is blocked by the lead row 95.

Next, the external shape determination unit 52 determines whether the external shape of the measurement object is correct or not based on the multiple measurement values V acquired by the measurement unit 51 (S20). In detail, the external shape determination unit 52 acquires the minimum value Vn of the multiple measurement values V as the external dimension W of the lead row 95 (S21). As described above, the irradiation angle is changed with respect to the stationary lead row 95 in the measurement area because even a normal lead row 95 without bending does not necessarily have a length direction that coincides with the horizontal direction.

Specifically, even when a normal lead row 95 is the measurement target, the lead row 95 may be inclined relative to the horizontal direction depending on the holding posture of the lead component 90 by the suction nozzle 134. It is also assumed that the normal lead row 95 may be inclined with a predetermined overall flatness relative to the component body 91 of the lead component 90. Here, as shown in FIG. 7, when the irradiation angle of the parallel light 25 coincides with the inclination angle of the lead row 95, the width of the portion of the parallel light 25 blocked by the lead row 95 becomes the minimum. Therefore, the measurement unit 51 obtains the minimum value Vn of the multiple measurement values V obtained in the measurement operation (S11) as described above as the outer dimension W of the lead row 95.

Then, the external shape determination unit 52 determines whether the external shape of the lead string 95 is correct or not based on whether the acquired external dimension W is within a preset allowable error range (S22). If the external dimension W is within the allowable error range (S22: Yes), the external shape determination unit 52 determines that the lead string 95 is correct and assigns "1 (True)" to the determination flag (S23). On the other hand, if the external dimension W is not within the allowable error range (S22: No), the external shape determination unit 52 determines that the lead string 95 is defective and assigns "0 (False)" to the determination flag (S24).

Next, the detection unit 53 judges whether the operation of the tilting device 30 is correct or not based on the change Mc of the multiple measured values V acquired by the measurement unit 51 (S30). In detail, the detection unit 53 calculates the change Mc of the multiple measured values V (S31). The change Mc is the difference between the maximum value Vx and the minimum value Vn of the multiple measured values V (Mc = Vx - Vn). Here, it is assumed that the irradiation angle of the parallel light 25 with respect to the lead row 95 is changed within a predetermined angle range Ar by the tilt of the tilting device 30, and the angle when the parallel light 25 is most inclined with respect to the lead row 95 is θ. Then, when the length L of the lead row 95 is sufficiently large compared to the width W, the maximum value Vx of the measured values V can be approximated to L sin θ.

In an environment where the tilting device 30 is operating normally, the closer the measurement object is to the ideal outer shape, the smaller the minimum value Vn becomes and approaches the design width W, and therefore the greater the change Mc. On the other hand, the more the measurement object deforms from the ideal shape, the greater the difference between the minimum value Vn and the design width W, and therefore the smaller the change Mc becomes. However, even if the lead row 95 has an abnormal outer shape, a certain amount of change Mc will occur. In contrast, in an environment where an abnormality occurs in the tilting by the tilting device 30, it is expected that the change Mc of the multiple measurement values V will be very small.

The detection unit 53 then determines whether the change Mc is within the tolerance Tr (S32). This tolerance Tr is set in advance so as to include the minimum change Mc that can be calculated even if the lead row 95 has an abnormal shape, on the premise that the irradiation angle of the parallel light 25 is changed within a predetermined angle range Ar by tilting the tilting device 30 during the measurement operation (S11). In this embodiment, the tolerance Tr is set to the range from the ideal change Md to the amount obtained by multiplying the ideal change Md by a predetermined coefficient K. Here, the predetermined coefficient K is set to, for example, 0.5.

If the amount of change Mc is within the allowable range Tr (S32: Yes), the detection unit 53 determines that the operation of the tilting device 30 is normal. Furthermore, if the result of the shape correctness determination (S20) is normal, that is, the determination flag is 1 (True) (S33: Yes), the detection unit 53 records the result that the shape of the lead row 95 to be measured is normal and that the operation of the tilting device 30 is normal (S34).

On the other hand, if the result of the shape correctness judgment (S20) is abnormal, i.e., the judgment flag is 0 (False) (S33: No), the detection unit 53 records the result that the shape of the lead row 95 being measured is abnormal and the operation of the tilting device 30 is normal (S35). In response to this result, the control device 16 of the component mounting machine 10 executes a response process for the defective component (S41). In this response process for the defective component, for example, the lead component 90 held by the suction nozzle 134 is disposed of in a specified disposal location, or a specified repair process is executed.

If the amount of change Mc is not within the allowable range Tr (S32: No), the detection unit 53 determines that the tilting device 30 is malfunctioning. Therefore, regardless of the result of the shape correctness determination (S20), the detection unit 53 records the result that the correctness of the shape of the lead row 95 to be measured is unknown and that a malfunction has occurred in the tilting device 30 (S36). In response to this result, the control device 16 of the component mounting machine 10 interrupts the mounting process of the lead components 90 and executes a notification process, such as notifying the operator to perform maintenance on the measuring device 20 (S42).

This encourages the worker to perform maintenance of the measuring device 20, for example by cleaning the moving parts of the tilting device 30, and it is expected that foreign matter will be removed early. When the maintenance of the measuring device 20 is completed, the suspended mounting process is resumed. The above measurement process is performed for each lead row 95 on each side of the lead component 90.

With this configuration, it is possible to determine whether the external shape of the measurement target (lead row 95) is correct based on multiple measurement values V (S20), and to detect the presence or absence of operational abnormalities in the tilting device 30 based on the amount of change Mc in the multiple measurement values V used in the determination (S30). This makes it possible to prevent measurement errors caused by operational abnormalities in the tilting device 30 and maintain proper measurement operations.

4. Modifications of the embodiment 4-1. Regarding the measurement object In the embodiment, the measurement object is the lead row 95 of the lead component 90. In the measurement process, the measurement unit 51 judges the suitability of the mounting process based on the outer dimension W, i.e., based on the flatness of the lead row 95. In addition to judging the suitability of the outer dimension W, the measurement unit 51 may measure the deformation amount or tilt angle of the lead row 95 in a specified direction based on the outer dimension W, and judge the suitability of each mounting process. Furthermore, the measurement object may be, in addition to the lead row 95 of the lead component 90, a predetermined portion of the component body 91, for example, or a predetermined portion of a component that does not have leads 92.

4-2. Regarding the measuring device 20 In the embodiment, the measuring device 20 is installed inside the component mounting machine 10. However, the measuring device 20 may be used in a device other than the component mounting machine 10. Specifically, the measuring device 20 may be applied to a work robot that stores various components on the tray 123. Furthermore, the measuring device 20 may be applied to a device that automatically performs maintenance and management of the suction nozzle 134, and may be used to inspect the external shape of the tip of the suction nozzle 134, for example.

In addition, the irradiation direction of the parallel light 25 of the measuring device 20 is not limited to the horizontal direction, but can be set to the vertical direction, etc., depending on the shape and posture of the measurement object. In addition, the parallel light 25 may be applied as irradiation light other than laser light. Alternatively, the measuring device 20 may irradiate the measurement object with irradiation light other than the parallel light 25, and the measuring unit 51 may measure the length of the range in which the irradiated light is reflected by the measurement object. For example, the measuring unit 51 may acquire image data from an imaging element that receives the reflected light, and measure the dimension of the measurement object in a specified direction by image processing.

In the embodiment, the detection unit 53 detects an abnormality in the operation of the tilting device 30 based on the amount of change Mc in the multiple measured values V. In addition, the detection unit 53 may take into account the defect rate of the measurement object and determine that an operational abnormality has occurred in the measuring device 20 when, for example, the measurement object is determined to be abnormal a predetermined number of times in succession.

10: Component mounting machine, 20: Measuring device, 21: Base, 23: Light projecting unit, 24: Light receiving unit, 25: Parallel light, 30: Tilting device, 31: Holding member, 40: Drive unit, 42: Cam, 43: Cam follower, 50: Measurement control device, 51: Measurement unit, 52: External shape determination unit, 53: Detection unit, 90: Component (lead component), 91: Component body, 92: Lead, 95: Lead row (measurement target)

Claims (12)

a light projection unit that irradiates a measurement object with light;
a tilting device that tilts the light projecting unit so as to change an irradiation angle of the light projected by the light projecting unit with respect to the measurement object;
a measurement unit that measures a length of a range of the irradiated light that is blocked or reflected by the measurement object;
an external shape determination unit that determines whether the external shape of the measurement target is correct or not based on a plurality of measurement values acquired by the measurement unit at each of a plurality of irradiation angles changed within a predetermined angle range by tilting the tilting device;
a detection unit that detects that an operation of the tilting device is abnormal when a change amount of the plurality of measurement values is not within an allowable range that is set based on a design outer shape of the measurement object and the angle range of the plurality of irradiation angles;
A measuring device comprising: The light projecting unit projects parallel light having a width greater than an outer dimension of the measurement target in a specified direction as the irradiation light,
The measurement device further includes a light receiving unit that receives a portion of the irradiated light that is not blocked by the measurement object,
The tilting device tilts the light projecting unit and the light receiving unit together,
The measurement device according to claim 1 , wherein the measurement section measures a length of a range of the irradiated light that is blocked by the measurement object based on a light receiving state of the light receiving section. The tilting device is
a holding member that is tiltably supported on a base and holds the light projecting unit and the light receiving unit in a predetermined positional relationship;
A drive unit that tilts the holding member;
The measurement device of claim 2 . the drive unit includes a cam rotatably provided on the base, and a cam follower provided on the holding member and in contact with a cam surface of the cam,
The measuring device according to claim 3 , wherein the drive unit tilts the holding member by causing the cam follower to reciprocate in a tilting direction of the holding member by rotation of the cam. The measuring device according to any one of claims 2 to 4, wherein the external shape determination unit acquires the minimum value among the plurality of measured values as the external dimension of the object to be measured, and determines whether the external shape of the object to be measured is correct or not based on the acquired external dimension. A measuring device as described in any one of claims 2 to 5, wherein the tolerance range is set to a range from an ideal change in the multiple measurement values obtained by the measuring unit when the irradiation light is irradiated at multiple irradiation angles to an amount obtained by multiplying the ideal change by a predetermined coefficient. The measurement device according to claim 6, wherein the predetermined coefficient is set based on a ratio between the amount of change in the multiple measurement values obtained by the measurement unit when the irradiation light is irradiated at multiple irradiation angles to the measurement object having an abnormal outer shape in which a part of the measurement object is deformed in the specified direction by a first deformation amount equal to the design outer dimension, and the ideal amount of change. The measuring device described in claim 6 or 7, wherein the predetermined coefficient is set to a number between 0.1 and 0.9. The measuring device according to any one of claims 2-8, wherein the measuring unit acquires the minimum value among the plurality of measured values as the external dimension of the object to be measured, and measures the amount of deformation in the specified direction based on the acquired external dimension. A measuring device as claimed in any one of claims 2 to 9, wherein the measuring unit measures the inclination angle of the object to be measured in the specified direction based on the irradiation angle when the minimum value among the multiple measurement values is obtained. A component mounting machine comprising the measuring device according to any one of claims 1 to 10, which mounts components on a board,
The component mounting machine, wherein the measurement target is a predetermined portion of the component. The component is a lead component having a plurality of leads arranged side by side on a component body,
12. The component mounting machine according to claim 11, wherein the measurement target is a lead row of the lead component.

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