JPH1056299A - Device recognition unit for mounter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize each device effectively by providing a control means for capturing an image based on signals from various means thereby discriminating the image of each device. SOLUTION: A head unit 5 sucks a plurality of devices and moves relatively to a sensor unit 23 in order to capture the image of respective sucked devices sequentially thus recognizing the device. In this regard, based on signals from a head sensor 25 and a clock signal generation means 32, a start signal generating means 33, a single device end signal generating means 34 and all device end signal generating means 35 set an image capture start timing and an image capture end timing for each sucked device in order to capture the image effectively while discriminating the devices. Control conditions may be adjusted depending on the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting machine constructed so that a head unit having a nozzle member sucks a component such as a chip component and mounts it at a predetermined position on a printed circuit board. The present invention relates to a component recognizing device of a mounting machine for recognizing a component adsorbed on a nozzle member.

[0002]

2. Description of the Related Art Conventionally, a head unit having a nozzle member for mounting components sucks a component such as an IC from a component supply unit, transfers the component onto a printed circuit board positioned at a predetermined position on the printed circuit board. A mounting machine designed to be mounted is generally known. Recently, there has been proposed a mounting machine in which a plurality of nozzle members are arranged in a head unit so as to improve mounting efficiency so that a plurality of components can be transferred at a time.

In such a mounting machine, there is a certain degree of variation in the position of the component when the component is sucked by the nozzle member, and it is required to correct the mounting position in accordance with the shift in the component suction position. For this reason, the picked-up component is recognized to detect a shift in the suction position with respect to the nozzle member, or to detect an abnormality of the component, for example, if the component has a lead, the lead is broken.

[0004] As a device for performing component recognition, for example, a line sensor is installed on a base of a mounting machine, and a head unit after component suction is passed through the line sensor.
There has been proposed an apparatus that irradiates required light for component recognition to a suction component to capture a component image, and performs component recognition based on the captured image.

[0005]

In a mounting machine having a component recognition device using a line sensor as described above and a plurality of nozzle members provided in the head unit, the components are respectively controlled by the nozzle members. After being sucked, the image of each component is continuously captured by the head unit moving linearly with respect to the line sensor.In this case, simply capturing a range including a plurality of components as a series of images, It is difficult to distinguish each component in the captured image, and image processing becomes complicated.

[0006] Further, in the case of component recognition, if the component recognition can be performed while changing the taking speed of the component image, the brightness of the image, etc. according to the type of the component, the efficiency and accuracy of the recognition can be expected to be improved. Conventionally, it is difficult to set the timing for changing the take-in speed or the like for each component, so that such control cannot be performed effectively.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. While moving a head unit with respect to a line sensor, images of a plurality of parts are continuously taken in, and images are formed for each part. Distinctly, properly adjust the start timing and end timing of the image capture,
An object of the present invention is to provide a component recognition device of a mounting machine that can effectively recognize each component.

[0008]

According to the present invention, there is provided a component recognition apparatus for a mounting machine, comprising: a head unit having a plurality of component suction nozzle members arranged in parallel; and a line sensor disposed in a moving path of the head unit. With the head unit and the line sensor being associated with each other, while moving the head unit relative to the line sensor,
In a mounting machine configured to sequentially capture and recognize images of components adsorbed on each nozzle member, a detecting unit for detecting that the head unit has reached a predetermined position, and a moving amount of the head unit are measured. Moving amount measuring means, start timing setting means for setting image capture start timing according to signals from the detecting means and moving amount measuring means, signals from the moving amount measuring means and start timing setting means, and component information. End timing setting means for setting the image capture end timing of each suction component in accordance with the above, and means for performing control for image capture based on signals from the movement amount measuring means, start timing setting means, and end timing setting means. It is provided with.

According to this device, the head unit relatively moves on the line sensor after the components are sucked, so that the images of the components sucked by the plurality of nozzle members of the head unit during this movement period are taken in from the line sensors. And component recognition is performed. At this time, the image capture start timing and the image capture end timing of each suction component are set based on the signals from the detection unit and the movement amount measurement unit, so that the process of capturing the image separately for each component is effectively performed. In addition, it is possible to perform control such as changing control conditions such as the moving speed for each component.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a component recognition device according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show the structure of a mounting machine on which a component recognition device according to the present invention is mounted. As shown in FIG. 1, a conveyor 2 for transporting a printed board is arranged on a base 1 of a mounting machine, and a printed board 3 is transported on the conveyor 2 and stopped at a predetermined mounting work position. It has become. A component supply unit 4 is arranged on the side of the conveyor 2. The component supply unit 4 includes a component supply feeder, for example, a multi-row tape feeder 4.
a.

Above the base 1, a head unit 5 for mounting components is provided. The head unit 5 is movable across the component supply unit 4 and the component mounting unit where the printed circuit board 3 is located.
It can move in the axial direction (the direction of the conveyor 2) and the Y-axis direction (the direction orthogonal to the X-axis on a horizontal plane).

That is, a fixed rail 7 in the Y-axis direction and a ball screw shaft 8 rotated and driven by a Y-axis servomotor 9 are disposed on the base 1, and a head unit is mounted on the fixed rail 7. A support member 11 is provided, and a nut portion 12 provided on the support member 11 is screwed to the ball screw shaft 8. The support member 11 has X
An axial guide member 13 and a ball screw shaft 14 driven by an X-axis servo motor 15 are provided, and the head unit 5 is movably held by the guide member 13,
A nut portion (not shown) provided on the head unit 5 is screwed to the ball screw shaft 14. And
By the operation of the Y-axis servo motor 9, the support member 11
The head unit 5 is moved in the X-axis direction with respect to the support member 11 by the operation of the X-axis servo motor 15 while moving in the axial direction.

The Y-axis servo motor 9 and the X-axis servo motor 15 are provided with position detecting devices 10 and 16 each composed of a rotary encoder, whereby the moving position of the head unit 5 is detected. It has become.

The head unit 5 is provided with a nozzle member 20 for adsorbing chip components. As shown in FIG. 2, in this embodiment, eight nozzle members 20 are provided side by side in the X-axis direction. Each nozzle member 20 moves up and down with respect to the frame of the head unit 5 (movement in the Z-axis direction).
And rotation about the nozzle center axis (R-axis) is enabled, and is operated by a Z-axis servo motor and an R-axis servo motor (not shown). Further, each of these servo motors is provided with a position detecting device to detect the moving position of each nozzle member 20.

Further, a sensor unit 23 for taking in a component image when recognizing the component adsorbed by each nozzle member 20 of the head unit 5 is disposed on the side of the component supply unit 4. ing.

The sensor unit 23 includes a large number of LEDs.
And a sensor body 23b having a line sensor 24. As shown in FIG. 3, the line sensor 24 is an image sensor in which CCD solid-state imaging devices 24a are arranged in a direction (Y-axis direction) orthogonal to the arrangement direction of the nozzle members 20, and is formed in the illumination unit 23a. The part image is taken in one-dimensionally through the slit part.

At the time of mounting, after the components are sucked by the nozzle members 20 of the head unit 5, the arrangement direction of the elements 24a of the line sensor 24 (main scanning direction; Y
The head unit 5 is moved in a direction (sub-scanning direction; X-axis direction; arrow S direction in FIGS. 1 and 2) orthogonal to the axis direction), and is attracted to each nozzle member 20 by the line sensor 24. Images of the component in the main scanning direction are sequentially captured in the sub-scanning direction and output to the image processing unit 30 as a predetermined image signal. Then, when the head unit 5 completely passes over the sensor unit 23, images of all the components that are sucked are captured.

On the base 1 of the mounting machine, the head is located in the movement path of the head unit 5 for component recognition, that is, at a predetermined position on the right side of the movement path of the head unit 5 with respect to the sensor unit 23. A head detection sensor 25 (shown in FIG. 4) is provided as detection means for detecting that the unit 5 has reached a predetermined position with respect to the line sensor 24. Based on the above line sensor 2
4, the timing to start capturing the part image is measured.

Although the overall configuration of the mounting machine configured as described above is omitted, the mounting machine includes a control device having a microcomputer as a component, and includes the Y-axis and X-axis servomotors 9 and 15 and a head. Each suction nozzle 20 of the unit 5
, The Z-axis servo motor, the R-axis servo motor, the line sensor 24 of the sensor unit 23, and the like are all electrically connected to the control device so as to be integrally controlled.

The control device includes an image processing unit 30 and an illumination control unit 60 as shown in FIG.

The image processing unit 30 controls and controls the capture of the component image by the sensor unit 23 and performs component recognition based on the captured image data. The image recognition unit 31 includes a clock signal generation unit. 32, a start signal generating means 33, a one-part end signal generating means 34 and an all-part end signal generating means 35.

The clock signal generating means 32 comprises a frequency dividing counter 40, a comparator 41, a frequency dividing register 42, and first and second gate circuits 43 and 44.
The clock signal in the image processing unit 30 is generated and output by dividing the frequency of the pulse train signal output from the position detection device 16.

More specifically, the number of pulses of the pulse train signal output from the position detecting device 16 is counted by the frequency dividing counter 40, and the frequency dividing register 42
Is compared with a preset count N. When the set count number N is reached, the comparator 4
It outputs a signal of one to one pulse.

That is, with the head unit 5 corresponding to the line sensor 24, the head unit 5 is moved relative to the line sensor 24 by driving the X-axis servo motor 15, The clock signal is generated by dividing the pulse train signal output from the position detecting device 16 by 1 / N times with the movement of the pulse train 5 in the X-axis direction.

The clock signal generating means 32 and the position detecting device 16 constitute a moving amount measuring means for measuring the moving amount of the head unit.

The clock signal generated by the clock signal generating means 32 is output from the comparator 41 to the first and second gate circuits 43 and 44. A detection signal from the head detection sensor 25 is input to the first gate circuit 43, and a clock signal is output from the first gate circuit 43 to the start signal generation unit 33 in accordance with the input of the detection signal. It is supposed to. The second gate circuit 44 receives a later-described fetching start signal output from the start signal generating means 33, and outputs a clock signal from the second gate circuit 44 according to the input of the signal. Unit 23 and one-part end signal generating means 34
Output.

The first gate circuit 43 and the start signal generating means 33 constitute start timing setting means for setting the image capture start timing, and the second gate circuit 44 and the one-part end signal generating means 34 This constitutes an end timing setting means for setting the end timing of image capture of each suction component.

The start signal generating means 33 comprises a capture start counter 46, a comparator 47 and a capture start register 48, and captures the clock signal output from the first gate circuit 43.
The count is made at 6, and the comparator 47 compares the count with the count set in the fetch start register 48 in advance. The count number is set so as to correspond to the moving distance from when the head unit 5 is detected by the head detection sensor 25 to when the head unit 5 reaches just before the sensor unit 23. When the set count is reached, the comparator 47 outputs a capture start signal to the second gate circuit 44. When the capture start signal is output to the second gate circuit 44 in this manner, the output of the clock signal to the sensor unit 23 is started as described above, and the component by the line sensor 24 is synchronized with the clock signal. Capture of an image is started.

The one-component end signal generating means 34 includes a line number counter 49, a comparator 50, and a line number register 51.
The clock signal output from the line number counter 4
The number is counted at 9, and the comparator 50 compares it with the count number set in the line number register 51 in advance. When the set count is reached, the comparator 50 sends a one-part end signal to the all-parts end signal generating means 35, that is, the line sensor 24.
Output a signal indicating that the capture of the component image of one component has been completed.

The count number set in the line number register 51 is set to a value at which one component image can be captured based on the type of the component to be recognized.

The all-parts end signal generating means 35 comprises a parts number counter 52, a comparator 53, and a parts number register 54, and outputs the one-part end signal output from the one-part end signal generating means 34 to the number of parts. Counter 5
The number is counted at 2, and the comparator 53 compares the count with a count previously set in the component count register 54. Then, when the set count number is reached, the comparator 53 sends to the image recognition unit 31 and the lighting switch circuit 62 an end-of-all-parts signal, that is, a signal indicating that the line sensor 24 has finished capturing all part images. Output.

The image recognizing section 31 writes the image data fetched by the line sensor 24 into the image memory in synchronization with the clock signal, and performs predetermined image processing on the image data to recognize the component. Things.

On the other hand, the illumination control section 60 comprises an F / V conversion section 61, an illumination switch circuit 62, and an illumination drive circuit 63, based on a pulse train signal output from the position detection device 16. The light amount of the illumination unit 23a in the sensor unit 23 is adjusted.

More specifically, based on the on-density (or off-density) of the pulse train signal output from the position detecting device 16, a voltage of a predetermined level indicating the rotation speed of the X-axis servomotor 15 is converted to an F / V converter. Drive circuit 63 for lighting from 61
And a current corresponding to the output voltage level is output from the illumination drive circuit 63 to the illumination section 23a. That is, in the above mounting machine, the head unit 5 is controlled by the position detecting means 16 and the F / V converter 61.
Speed detecting means is configured.

The illumination drive circuit 63 includes the F
Voltage level output from / V conversion unit 61 and illumination unit 23
a table that defines a correspondence relationship with the current value supplied to the head unit 5. For example, as shown in FIG. 5, the illuminance on the suction component increases in proportion to the moving speed of the head unit 5. The table is set so that the light amount of the light 23a becomes high. In this table, the brightness of the image captured by the line sensor 24 based on the relative relationship between the moving speed of the head unit 5 and the light amount of the illumination unit 23a is optimal for the image recognition by the image recognition unit 31. Brightness is set to

The detection signal from the head detection sensor 25 and the all component end signal from the all component end signal generating means 35 are input to the illumination switch circuit 62. An ON signal is output to the illumination drive circuit 63 based on the input, and an OFF signal is output to the illumination drive circuit 63 based on the input of the all component end signal. The lighting drive circuit 63 is turned on / off from the lighting switch circuit 62.
Based on the input of the OFF signal, when the ON signal is input, the current supply to the lighting unit 23a is started, while when the OFF signal is input, the current supply is cut off.

Next, the component recognition operation of the mounting machine configured as described above will be described.

When the mounting operation is started in the mounting machine, the head unit 5 is moved to the component supply unit 4 and the components are sucked by the nozzle members 20. When the suction of the component is completed, the head unit 5 is moved with respect to the sensor unit 23 for component recognition. Specifically, after the head unit 5 is set at the right end of the movement path for the sensor unit 23, the head unit 5 is moved leftward (in the direction of the arrow S in FIGS. 1 and 3) from this position.

Then, the movement for component recognition is started as described above, and the head unit 5 is moved to the head detection sensor 25.
When the clock signal is detected, the start signal generator 33 of the image processor 30 starts counting the clock signal output from the clock signal generator 32. Further, in the lighting control unit 60, an ON signal is output from the lighting switch circuit 62 to the lighting drive circuit 63, whereby a current corresponding to the moving speed of the head unit 5 is supplied, and the lighting unit 23a recognizes a component. Is started.

When the count number in the start signal generating means 33 reaches a predetermined count number, the start signal generating means 33 outputs a component image fetch start signal, and the line sensor 24 starts fetching a component image. .

When the capturing of the component image is started, the images of the suction component in the main scanning direction are sequentially captured in the sub-scanning direction at a timing synchronized with the clock signal. Stored in memory. When the counting of the clock signal is started in the one-component end signal generating means 34 and the count reaches a predetermined count, that is, when the image capturing of one component is completed, the one-component end signal generating means 34 An end signal is output. Then, the image capturing of the next component is performed in the same manner, and the image of each component is sequentially captured.

The all-parts end signal generating means 35
, A one-component end signal is counted, and when this count reaches a predetermined count, that is, when the capturing of the component images of all the components is completed, the image recognition unit 31 and the An all-components end signal is output to the lighting switch circuit 62.

When the all-parts end signal is input to the image recognizing unit 31, the image recognizing unit 31 reads out the image data of each component stored in the memory, and performs predetermined image processing on the image data. Thereby, each component adsorbed to the head unit 5 is recognized.

When the all-components end signal is input to the illumination switch circuit 62, an OFF signal is output from the illumination switch circuit 62 to the illumination drive circuit 63 based on the signal, whereby the illumination unit 23a receives the OFF signal. The current supply is cut off, and the illumination unit 23a is turned off.

According to the mounting machine configured as described above, a plurality of components are sucked by the head unit 5, and each sucked component image is sequentially transferred while the head unit 5 is relatively moved with respect to the sensor unit 23. In this case, the component recognition can be performed. In this case, based on signals from the head detection sensor 25 and the clock signal generation unit 32, the start signal generation unit 33 and the one-component end signal generation unit 3
By setting the image capture start timing and the image capture end timing of each suction component by the 4 and all component end signal generating means 35, the process of capturing the image separately for each component is effectively performed.

It is also possible to adjust the control conditions according to the components. For example, when only components having relatively simple shapes that are relatively easy to recognize are mounted, the moving speed of the head unit 5 with respect to the sensor unit 23 is increased to capture component images, thereby shortening the component image capturing time. In addition, when a component having a simple shape and a component having a complicated shape that are relatively easy to recognize are simultaneously attached and mounted, the moving speed of the head unit 5 is set only when capturing the component image of the component having the simple shape. By increasing the height, the component recognition method can be performed such that the moving speed of the head unit 5 with respect to the sensor unit 23 is changed in accordance with the type of the component while continuously capturing each of the suction component images. It can be adopted. Therefore, in the mounting machine of the above embodiment, by adopting such a component recognition method, it is possible to perform component recognition with high accuracy while improving component recognition efficiency.

Further, in the apparatus according to the present embodiment, the illuminating unit is controlled so that the brightness of the image captured by the line sensor 24 becomes optimal for image recognition by the image recognition unit 31 in accordance with the moving speed of the head unit 5. Since the light quantity of the light 23a is adjusted, it is not necessary to perform the approach operation of the head unit for maintaining a constant speed as in the related art. Therefore, the approach space can be reduced, and the degree of freedom of the location of the line sensor can be increased, so that the space saving of the mounting machine can be effectively achieved. In addition, since the run-in operation of the head unit with respect to the line sensor is not necessary, the mounting time can be reduced by the run-in operation as compared with the conventional device, and the mounting efficiency can be improved.

In the conventional apparatus, when the moving speed of the head unit fluctuates, the optimum brightness required for image recognition is determined by the relationship between the moving speed of the head unit and the amount of light emitted. By the way, according to the above-described mounting machine, the component image can be captured with the optimal brightness for image recognition regardless of the moving speed of the head unit 5. Even if the moving speed of the head unit 5 fluctuates, the component recognition accuracy does not deteriorate, and therefore, the component recognition can be performed more accurately than the conventional device.

The above mounting machine is an embodiment of a mounting machine to which an example of the component recognition device according to the present invention is applied.
The specific structure can be appropriately changed without departing from the gist of the present invention. For example, in the above embodiment, the light amount of the illumination unit 23a in the sensor unit 23 is increased in proportion to the moving speed of the head unit 5, but
It is not necessary to set the light amount to be strictly higher in proportion to the moving speed of the head unit 5. For example, depending on the type of components to be recognized, the illumination unit 23 a If accurate component recognition can be performed even if the light amount of the
As the moving speed increases, the light amount of the illumination unit 23a may be increased stepwise. In short, according to the moving speed of the head unit 5, the illuminating unit 2 can capture the component image with the optimum brightness required at the time of image recognition.
What is necessary is just to set the light quantity of 3a.

[0051]

As described above, according to the component recognition apparatus of the present invention, the head unit relatively moves on the line sensor after the component is sucked, so that the head unit is sucked by the plurality of nozzle members provided in the head unit. The image of the component is read from the line sensor and component recognition is performed. At this time, based on signals from the detecting means for detecting that the head unit has reached the predetermined position and the moving amount measuring means for measuring the moving amount of the head unit, the start timing setting means and the end timing setting means Since the capture start timing and the image capture end timing of each suction component are set, it is possible to effectively perform the process of capturing the image separately for each component. Further, it is also possible to perform control such as changing control conditions such as a moving speed for each component sucked by each of the nozzle members,
Efficiency and recognition accuracy of a part image by the line sensor can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a mounting machine to which an example of a component recognition device according to the present invention is applied.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged schematic view of a main part showing a line sensor.

FIG. 4 is a circuit configuration diagram illustrating an image processing unit and an illumination control unit.

FIG. 5 is a graph illustrating a relationship between a moving speed of a head unit and a light amount of an illumination unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Conveyor 3 Printed circuit board 4 Component supply part 5 Head unit 15 X-axis servo motor 16 Position detection means 20 Nozzle member 23 Sensor unit 23a Illumination part 23b Sensor main body part 24 Line sensor 25 Head detection sensor 31 Image recognition part 32 Clock Signal generation means 33 Start signal generation means 34 One-part end signal generation means 35 All-part end signal generation means

Claims (1)

[Claims] A head unit provided with a plurality of nozzle members for picking up parts in parallel, and a line sensor disposed in a movement path of the head unit, wherein the head unit and the line sensor are associated with each other. In a mounting machine configured to sequentially capture and recognize the image of the component adsorbed by each nozzle member while moving the head unit relative to the line sensor in the Detecting means for detecting that the position has been reached; moving amount measuring means for measuring the moving amount of the head unit; and start timing setting for setting an image capturing start timing in accordance with signals from the detecting means and the moving amount measuring means. Means for ending the image capture of each suction component in accordance with signals from the movement amount measuring means and the start timing setting means and the component information. Timing setting means for setting the timing, and means for performing control for image capture based on signals from the moving amount measuring means, the start timing setting means, and the end timing setting means. Machine parts recognition device.