JP4445087B2 - Cleaning method for image recognition device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cleaning an image recognition device in an electronic component mounting machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electronic component mounting machine that vacuum-sucks an electronic component to a predetermined position on a substrate by using a suction nozzle has been widely used.
[0003]
In this case, the image recognition device detects the relative positional relationship between the position of the suction nozzle and the electronic component sucked by the suction nozzle, corrects the relative positional relationship, and mounts the electronic component on the substrate. I have to.
[0004]
The image recognition device includes a cover glass arranged substantially horizontally with a substantially square plate-like body, and a camera that is arranged below the cover glass and monitors the upper side, and the range above the cover glass is a wall. Surrounded by the body, a plurality of light sources for illumination are arranged inside the wall body, illuminate the electronic component conveyed above the cover glass, and the camera displays an image of the electronic component from below through the cover glass. To be recognized.
[0005]
In order for the camera to accurately capture the image of the electronic component, it is desirable that the cover glass is always kept in a highly transparent state, but as time passes, dust gradually accumulates on the upper surface of the cover glass. If the dust is left unattended, the accuracy with which the camera recognizes the position of the electronic component is reduced or cannot be recognized, and the electronic component may not be correctly mounted on the substrate.
[0006]
In order to prevent such a reduction in the recognition accuracy of the camera, conventionally, an operator regularly cleans the upper surface of the cover glass by manual work, but the cover glass is expensive and is placed inside the wall body. Since it is located, cleaning of the cover glass needs to be performed carefully and in a narrow wall, and the cleaning operation is not easy. In addition, since the dust accumulation state is difficult to observe from the outside, there is a problem that the accumulated dust is left and a recognition error of the camera occurs.
[0007]
[Problems to be solved by the invention]
On the other hand, there is known an electronic component mounting machine in which an air blow device is installed in the vicinity of an image recognition device and the air blow device automatically performs blow cleaning.
[0008]
According to such blow cleaning, the image recognition device can be easily cleaned without damaging the cover glass, but the electronic component mounting machine moves within a certain range during the electronic component mounting operation. It is necessary to install the air blowing device so as not to interfere with the electronic component mounting machine moving in this way, the installation space is limited by the shape of the electronic component mounting machine, and part of the upper surface of the cover glass is not blown sufficiently In some cases, it was impossible to perform proper blow cleaning.
[0009]
Moreover, if a dedicated air blow device is installed, there is a problem that the cost of the electronic component mounting machine increases.
[0010]
In view of such a problem, the present invention provides a cleaning method for an image recognition apparatus capable of sufficiently and inexpensively cleaning dust accumulated on the upper surface of a cover glass regardless of the shape of the electronic component mounting machine. The purpose is to provide.
[0011]
[Means for Solving the Problems]
According to the present invention, the head unit that can move in the XY direction between the electronic component supply unit and the electronic component mounting unit can be moved in the Z direction and can be rotated about the θ axis. A slide shaft that is supported and detachably supports a suction nozzle that vacuum-sucks an electronic component at its tip, and an intake / exhaust unit that is connected to the slide shaft via a pipe and sucks and exhausts air from the tip of the slide shaft And an image recognition device that detects a position of an electronic component sucked by a suction nozzle attached to the tip of the slide shaft, and a cleaning method for an image recognition device in an electronic component mounting machine comprising: The position of the image recognition device is approached, and the compressed air supplied from the slide shaft tip by the intake / exhaust means is recognized by the image. By discharging with respect to location, the cleaning method for an image recognition apparatus characterized by blowing clean the image recognition device is intended to achieve the above object.
[0012]
Alternatively, a cleaning nozzle may be attached to the tip of the slide shaft, and the compressed air may be discharged from a discharge port of the cleaning nozzle to perform the blow cleaning.
[0013]
Further, the blow cleaning may be performed by discharging the compressed air from an outlet of the cleaning nozzle in at least one direction of obliquely downward, substantially horizontal, and substantially vertically downward.
[0014]
Furthermore, the blow cleaning may be performed while rotating the slide shaft around the θ axis.
[0015]
The image recognition apparatus includes a cover glass provided substantially horizontally and a wall body surrounding the upper periphery of the cover glass, and the slide shaft or the cleaning nozzle is disposed on the wall from above. The head unit is moved in the XY direction within a range where the slide shaft or the cleaning nozzle and the wall body maintain a certain distance while being lowered to the inside of the body and approaching the cover glass. However, the upper surface of the cover glass may be blow-cleaned.
[0016]
Further, the blow cleaning may be automatically performed after a certain time.
[0017]
Furthermore, the blow cleaning may be performed in conjunction with an operation of a power switch of the electronic component mounting machine.
[0018]
According to the present invention, it is possible to remove dust accumulated by sufficiently blowing and cleaning the image recognition apparatus with compressed air.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
[0020]
As shown in FIG. 1, an electronic component mounting machine 10 for carrying out a method according to an example of an embodiment of the present invention includes a tape feeder 12 at an electronic component supply position, and a substrate 14 at an electronic component mounting position. Is supported by the head unit 16 that is movable in the XY direction between the head unit 16 so as to be movable in the Z direction and rotatable about the θ axis. A slide shaft 22 that removably supports the suction nozzle 20 for the purpose, an intake / exhaust means 26 that is connected to the slide shaft 22 via a pipe line 24 and sucks and exhausts air from the slide shaft tip 22A, and the slide shaft tip An image recognition device 28 for detecting the position of the electronic component 18 sucked by the suction nozzle 20 attached to 22A, and a nozzle for holding a replacement nozzle A box 30, be configured with a, a cover glass 28A upper surface of the image recognition apparatus 28, the slide shaft tip 22A is that so as to blow clean with compressed air ejected.
[0021]
The electronic component mounting machine 10 is an operation provided with a control means 32 for controlling the mounting operation of the electronic component 18 and the cleaning operation of the image recognition device 28, and a power switch of the electronic component mounting machine 10. And a panel 34.
[0022]
As shown in FIG. 2, the suction nozzle 20 has a locking groove 20 </ b> A for inserting into and removing from the slide shaft 22 from below, and a flange portion 20 </ b> B for locking to the nozzle box 30. Yes.
[0023]
The slide shaft 22 is a hollow pipe-like member arranged in the vertical direction and can be ventilated from the upper end to the tip 22A.
[0024]
A lock mechanism (not shown) having a click ball is provided inside the vicinity of the tip 22A, and the click ball locks the locking groove 20A of the suction nozzle 20 by the click mechanism, and Thus, the slide shaft 22 can lock the suction nozzle 20 and can be released.
[0025]
One end of the pipe line 24 is a flexible tube connected to the intake / exhaust means 26, and the other end is connected to the upper end of the slide shaft 22.
[0026]
The intake / exhaust means 26 includes a negative pressure generator 26A, a compressor 26B, an electromagnetic valve 26C, and a pipe 26D.
[0027]
The negative pressure generator 26A and the compressor 26B are connected to the electromagnetic valve 26C through the pipe 26D, respectively.
[0028]
The electromagnetic valve 26C is supported by the head unit 16 in the vicinity of the upper end of the slide shaft 22, and has an intake / exhaust port to which one end of the piping 24 is connected. By switching the valve, the negative pressure is generated. Intake by the vessel 26A or exhaust by the compressor 26B can be selectively transmitted to the slide shaft 22.
[0029]
As shown in FIGS. 1 and 2, the image recognition device 28 is a substantially square plate-like body that is disposed substantially horizontally and is disposed below the cover glass 28A, and monitors the upper side. A camera 28B, an upper wall body 28C and a lower wall body 28D that are arranged in a vertical direction so as to surround the upper and lower sides of the cover glass 28A, and a plurality of pieces installed inside the upper wall body 28C and the lower wall body 28D. An upper illumination light source 29A and a lower illumination light source 29B made of LEDs, and a half mirror 28E disposed at an inclination between the cover glass 28A and the camera 28B are configured.
[0030]
The upper illumination light source 29A is installed on the inner side of all four surfaces of the upper wall 28C.
[0031]
The lower illumination light source 29B is laid only inside one of the four surfaces of the lower wall 28D, and one surface of the lower wall 28D where the lower illumination light source 29B is laid is the upper wall. Projecting to 28C.
[0032]
The half mirror 28E is disposed so as to reflect the illumination light of the lower illumination light source 29B upward.
[0033]
As shown in FIG. 1, the nozzle box 30 can lock the flange portion 20 </ b> B of the suction nozzle 20, and the suction nozzle 20 and the slide shaft 22 are detachable.
[0034]
The control means 32 is connected to the head unit 16 and controls movement of the head unit 16 in the XY direction, movement of the slide shaft 22 in the Z-axis direction, and movement around the θ axis. In addition, it is connected to the electromagnetic valve 26C of the intake / exhaust means 26 so that the transfer of intake / exhaust from the intake / exhaust means 26 to the slide shaft 22 can be controlled.
[0035]
The operation panel 34 includes a power switch of the electronic component mounting machine 10 and an image recognition device cleaning switch (both not shown), and is connected to the control means 32.
[0036]
Next, for the convenience of describing the operation of cleaning the image recognition device 28 in the electronic component mounting machine 10, the operation of mounting the electronic component will be described first.
[0037]
When the electronic component 18 is mounted on the substrate 14 by the electronic component mounting machine 10, the control means 32 moves the head unit 16 in the XY direction so that the slide shaft 22 is moved to the tape feeder 12. The suction nozzle 20 is moved down together with the slide shaft 22 to bring the lower end of the suction nozzle 20 closer to the electronic component 18 and then the electromagnetic valve 26C of the intake / exhaust means 26 is driven. Then, intake air from the negative pressure generator 26 </ b> A is transmitted to the slide shaft 22 and the suction nozzle 20, and the electronic component 18 is vacuum-sucked to the lower end of the suction nozzle 20.
[0038]
Next, after raising the suction nozzle 20 and the electronic component 18 together with the slide shaft 22, the head unit 16 is moved in the XY direction, and the electronic component 18 is moved to the image recognition device 28. It is located above the cover glass 28A.
[0039]
The image recognition device 28 illuminates the electronic component 18 with the upper illumination light source 29A and the lower illumination light source 29B, and recognizes an image of the electronic component 18 with the camera 28B through the cover glass 28A. The relative position in the XY direction of the electronic component 18 with respect to the slide shaft 22 and the relative phase angle around the θ axis are detected.
[0040]
Based on the detection result, the control means 32 rotates the slide shaft 22 to correct the phase angle of the electronic component 18 around the θ axis, and the electronic component 18 is moved relative to the slide shaft 22. While correcting the relative position in the XY direction, the head unit 16 is moved in the XY direction to transport the electronic component 18 to above the substrate 14.
[0041]
Next, together with the slide shaft 22, the suction nozzle 20 and the electronic component 18 are lowered to bring the electronic component 18 close to a predetermined position on the substrate 14, and then the electromagnetic of the intake / exhaust means 26. The valve 26C is driven, the compressed air from the compressor 26B is supplied to the slide shaft 22 and the suction nozzle 20, the compressed air is discharged from the lower end of the suction nozzle 20, and the electronic component 18 is released. Thus, the mounting of the electronic component 18 on the substrate 14 is completed.
[0042]
Next, the action at the time of cleaning of the image recognition device 28 in the electronic component mounting machine 10 will be described.
[0043]
Dust gradually accumulates on the cover glass 28 </ b> A of the image recognition device 28, and when the accumulated dust is left, the camera 28 </ b> B erroneously recognizes the image of the electronic component 18 and the electronic component with respect to the slide shaft 22. The correction of the relative position of the 18 in the XY direction and the correction of the phase angle around the θ axis may not be performed correctly, and the electronic component 18 may not be mounted at a predetermined position on the substrate 14.
[0044]
In order to prevent such a mounting error of the electronic component 18 on the substrate 14, an operator periodically turns on an image recognition device cleaning switch of the operation panel 34, and the control means 32 receives the image recognition device. When the cleaning 28 is executed, the cleaning is executed according to the flowchart shown in FIG.
[0045]
When the electromagnetic valve 26C of the intake / exhaust means 26 does not transmit the intake air from the negative pressure generator 26A to the slide shaft 22 and the suction nozzle 20, the control means 32 causes the suction nozzle 20 to transmit the electronic component. 18 is determined not to be sucked, and the suction nozzle 20 is moved toward the nozzle box 30 in order to remove the suction nozzle 20 from the slide shaft 22 and return it to the nozzle box 30.
[0046]
When it is determined that the electronic component 18 is attracted to the suction nozzle 20, the control unit 32 moves the suction nozzle 20 to the nozzle box 30 after the mounting of the electronic component 18 on the substrate 14 is completed. Move towards.
[0047]
When the slide shaft 22 is raised in the nozzle box 30 while the flange portion 20B of the suction nozzle 20 is locked, the click ball of the slide shaft 22 resists the urging force of the suction nozzle 20. The suction nozzle 20 is released from the locking groove 20 </ b> A, and the released suction nozzle 20 is stored in the nozzle box 30.
[0048]
Next, after the slide shaft 22 from which the suction nozzle 20 has been removed is moved to above the cover glass 28A of the image recognition device 28, the slide shaft 22 is lowered to the inside of the upper wall 28C, and the slide shaft 22 is moved down. The tip 22A of the image recognition device 28 is brought close to the center of the upper surface of the cover glass 28A.
[0049]
In this state, when the electromagnetic valve 26C of the intake / exhaust means 26 is driven to supply the compressed air from the compressor 26B to the slide shaft 22, the compressed air is supplied to the slide shaft 22 as shown in FIG. Blow cleaning is performed by blowing away dust deposited on the upper surface of the cover glass 28A from the front end 22A, and blown up and blown up. The upper wall 28C of the image recognition device 28 To the outside.
[0050]
Since the slide shaft 22 descends to the inside of the upper wall 22C and approaches the cover glass 28A to perform blow cleaning, the upper surface of the cover glass 28A is sufficiently blow cleaned.
[0051]
Since the discharge hole at the tip 22A of the slide shaft 22 is wider than the hole at the tip of the suction nozzle 20, as compared with the case where blow cleaning is performed while the suction nozzle 20 remains engaged with the slide shaft 22. More compressed air can be discharged, and efficient blow cleaning is performed.
[0052]
When blow cleaning is performed for a certain period of time, the electromagnetic valve 26C of the intake / exhaust means 26 is driven to stop the supply of compressed air to the slide shaft 22 by the compressor 26B, and the slide shaft 22 is raised. In order to mount the suction nozzle 20, the suction nozzle 20 is moved toward the nozzle box 30.
[0053]
Among the suction nozzles stored in the nozzle box 30, after moving the slide shaft 22 to above the suction nozzle suitable for the electronic component to be mounted, when the slide shaft 22 is lowered, The click ball engages with the locking groove 20 </ b> A of the suction nozzle 20, whereby the suction nozzle 20 engages with the slide shaft 22, and the operation of attaching the suction nozzle 20 to the slide shaft 22 is completed.
[0054]
Thereafter, normal electronic component mounting work is resumed.
[0055]
According to the example of the present embodiment, the upper surface of the cover glass 28A of the image recognition device 28 is used by utilizing the slide shaft 22 and the intake / exhaust means 26, which are used for normal electronic component mounting work. Dust accumulated on the upper surface of the cover glass 28A, which can be sufficiently blow-cleaned and difficult to remove by hand, can be easily removed, and does not require a dedicated air blowing device or the like. Blow cleaning can be performed at a low cost.
[0056]
In the example of the present embodiment, an operator periodically operates the image recognition device cleaning switch of the operation panel 34 to cause the control means 32 to perform blow cleaning of the image recognition device 28. However, the present invention is not limited to this, and the blow cleaning is executed when a power switch (not shown) of the electronic component mounting machine 10 provided on the operation panel 34 is turned on. Alternatively, when the power switch is turned off, the blow cleaning may be performed for a certain time, and the power may be actually turned off after the blow cleaning is completed.
[0057]
Further, the image recognition device 28 may be automatically cleaned by the control means 32 after a certain period of time.
[0058]
In this way, the blow cleaning of the image recognition device 28 is executed in conjunction with the operation of the power switch of the electronic component mounting machine 10, and automatically by the control means 32 after a certain time. As a result, the operator forgets to periodically operate the image recognition device cleaning switch, the dust accumulated on the upper surface of the cover glass 28A is left unattended, and the camera 28B erroneously displays the image of the electronic component 18. The situation of recognition can be avoided reliably.
[0059]
Furthermore, in the example of the present embodiment, the blow cleaning is performed by removing the suction nozzle 20 from the slide shaft 22 and directly discharging compressed air from the tip 22A of the slide shaft 22. When the discharge hole at the tip of the suction nozzle 20 is large enough to perform the blow cleaning, the blow cleaning may be performed with the suction nozzle 20 attached to the slide shaft 22. Good.
[0060]
Next, a second example of the embodiment of the present invention will be described.
[0061]
As shown in FIG. 4, the second example of the present embodiment is characterized in that the cleaning is performed by attaching a cleaning nozzle 36 to the slide shaft 22 as compared with the first example of the embodiment.
[0062]
Since the other components are the same as those in the first example of the embodiment, the same reference numerals as those in FIG. 1 and FIG.
[0063]
As shown in FIG. 4, the cleaning nozzle 36 has a plurality of discharge holes for discharging the compressed air in the circumferential direction at an appropriate interval in the circumferential direction in addition to the vertically downward direction, in addition to the vertically downward direction. It is characterized by having.
[0064]
Since the structure and method for attaching and detaching the cleaning nozzle 36 and the slide shaft 22 are the same as those of the suction nozzle 20, description thereof will be omitted.
[0065]
Next, the operation of the second example of the present embodiment will be described.
[0066]
When the image recognition device 28 is cleaned manually or automatically, the control means 32 returns the suction nozzle 20 to the nozzle box 30 and then returns the nozzle, as in the first example of the embodiment. The cleaning nozzle 36 stored in the box 30 is attached to the slide shaft 22, and the cleaning nozzle 36 is moved above the cover glass 28 </ b> A of the image recognition device 28.
[0067]
Next, the slide shaft 22 is lowered into the upper wall 28 </ b> C of the image recognition device 28, and the cleaning nozzle 36 is brought close to the upper surface of the cover glass 28 </ b> A of the image recognition device 28.
[0068]
In this state, the cleaning nozzle 36 is rotated around the θ axis together with the slide shaft 22, and the upper illumination light source 29A provided with the slide shaft 22 and the cleaning nozzle 36 inside the upper wall 28C. The slide shaft 22 and the cleaning nozzle 36 are horizontally moved in the XY direction within a range that keeps a certain distance from the inside of the upper wall 28C so as not to come into contact with the upper wall 28C. The electromagnetic valve 26C of the exhaust means 26 is driven to supply compressed air from the compressor 26B to the slide shaft 22 and the cleaning nozzle 36, and this compressed air is supplied from the discharge hole of the cleaning nozzle 36 to the cover. Blow cleaning is performed by discharging onto the upper surface of the glass 28A.
[0069]
Since the cleaning nozzle 36 has a discharge hole for discharging the compressed air not only vertically downward but also obliquely downward and horizontally, the tip 22A of the slide shaft 22 discharges the compressed air only vertically downward. For the first example of the embodiment, blow cleaning is performed over a wide range without being biased toward the center of the cover glass 28A, and air is agitated in a complicated manner in the upper wall 28C. The dust soared by the compressed air can be discharged to the outside of the upper wall 28C without blowing up at a specific position.
[0070]
Further, the vertically downward and obliquely downward discharge ports of the cleaning nozzle 36 are located below the tip 22A of the slide shaft 22 and are closer to the upper surface of the cover glass 28A than in the first example of the embodiment. Since compressed air can be discharged from the position where it carried out, efficient blow cleaning can be performed.
[0071]
Furthermore, dust accumulated on the upper illumination light source 29A can be blow-cleaned by compressed air discharged in the horizontal direction.
[0072]
Furthermore, by rotating the cleaning nozzle 36 around the θ axis and performing blow cleaning while horizontally moving in the XY direction, the blow cleaning is not further biased, and the entire range of the cover glass 28A is obtained. In addition, the air in the upper wall 28C is further agitated in a more complicated manner, so that the dust that has risen by the compressed air does not accumulate in the upper wall 28C and moves to the outside of the upper wall 28C. Can be discharged.
[0073]
Note that, as in the second example of the embodiment of the present invention, even if the cleaning nozzle 36 is rotated around the θ axis and is horizontally moved in the XY direction, blow cleaning is not performed. When the blow cleaning is not sufficiently biased and performed over the entire range of the cover glass 28A, the cleaning nozzle 36 is either rotated around the θ axis or moved horizontally in the XY direction. Blow cleaning may be performed with the above movement, or the blow cleaning may be performed in a state where the cleaning nozzle 36 approaches and stays close to the upper vicinity of the center of the cover glass 28A.
[0074]
【The invention's effect】
According to the present invention, dust that accumulates on the cover glass of the image recognition device can be easily blown and sufficiently cleaned at low cost by using intake / exhaust means, a slide shaft, and the like that are used for mounting electronic components. The excellent effect of being able to do is brought about.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of an electronic component mounting machine according to a first example of an embodiment of the present invention. FIG. 2 is a cross-sectional view showing main parts of the slide shaft, suction nozzle, and image recognition apparatus. 3] Flow chart showing the flow of the cleaning method of the image recognition apparatus. [FIG. 4] Cross-sectional view showing the main part of the cleaning nozzle according to the second example of the embodiment of the present invention.
DESCRIPTION OF SYMBOLS 10 ... Electronic component mounting machine 12 ... Tape feeder 14 ... Board | substrate 16 ... Head unit 18 ... Electronic component 20 ... Adsorption nozzle 20A ... Locking groove 22 ... Slide shaft 22A ... Tip 24 ... Pipe line 26 ... Intake / exhaust means 26A ... Negative pressure Generator 26B ... Compressor 26C ... Solenoid valve 26D ... Piping 28 ... Image recognition device 28A ... Cover glass 28B ... Camera 28C ... Upper wall 28D ... Lower wall 28E ... Half mirror 29A ... Upper illumination light source 29B ... Lower illumination light source 30 ... Nozzle box 32 ... Control means 34 ... Operation panel 36 ... Nozzle for cleaning

Claims (5)

The head unit, which is movable in the XY direction between the electronic component supply position and the electronic component mounting position, is supported so as to be movable in the Z direction and rotatable about the θ axis. A slide shaft that detachably supports a suction nozzle for vacuum suction, an intake / exhaust means that is connected to the slide shaft via a pipe line and sucks and exhausts air from the slide shaft tip, and a suction nozzle that is attached to the slide shaft tip In the cleaning method of the image recognition device in the electronic component mounting machine comprising: an image recognition device that detects the position of the electronic component attracted by
Attached to the slide shaft tip instead a cleaning nozzle having a plurality of discharge ports for discharging the compressed air obliquely downward and a horizontal Direction and vertically downward to the suction nozzle,
The cleaning nozzle is brought closer to the image recognition apparatus, the intake and exhaust of compressed air supplied by means of a plurality of ejection ports of the nozzles for the cleaning and the obliquely downward with respect to the image recognition device the horizontal Direction And cleaning the image recognition device by blow-cleaning the image recognition device.   The image recognition apparatus cleaning method according to claim 1, wherein the blow cleaning is performed while rotating the cleaning nozzle around the θ axis.   3. The image recognition device according to claim 1, wherein the image recognition device includes a cover glass provided substantially horizontally and a wall body surrounding the upper periphery of the cover glass, and the cleaning nozzle is disposed from above. While moving the head unit in the XY direction within a range in which the head unit is lowered to the inside of the wall body to approach the cover glass and the cleaning nozzle and the wall body maintain a certain distance, A method for cleaning an image recognition apparatus, comprising blow-cleaning an upper surface of a cover glass.   4. The cleaning method for an image recognition apparatus according to claim 1, wherein the blow cleaning is automatically performed after a predetermined time.   5. The image recognition apparatus cleaning method according to claim 1, wherein the blow cleaning is performed in conjunction with an operation of a power switch of the electronic component mounting machine.

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