JP4451192B2 - Method for creating inspection data, inspection device for screen printing, and screen printer with inspection function - Google Patents

Description

  The present invention provides a method for creating inspection data for inspecting at least one of a screen-printed printed material and a screen mask, and the screen-printed printed material and the screen mask using the inspection data. The present invention relates to a screen printing inspection apparatus for inspecting at least one of the above, and a screen printing machine with an inspection function provided with the screen printing inspection apparatus.

In mounting electronic components, paste solder is applied to the surface of the substrate prior to mounting the electronic components on the substrate (printed circuit board), and a method of screen printing is widely adopted as the application method. Yes. Further, in order to inspect whether or not the screen printing is performed at an appropriate location, a printing inspection is performed after the printing on the substrate. In this print inspection, the printed circuit board is imaged using an imaging means such as a camera, and the captured image is collated with inspection data input in advance to the inspection apparatus, and solder is printed at the correct position. It is determined whether or not. As a method of creating the inspection data, the pattern opening is correctly formed, and the entire area of the screen mask for screen printing to be used for printing is imaged by the imaging means, and the screen mask is formed based on the captured image. A method of creating inspection data by recognizing the opening and performing image processing, or selecting a substrate that seems to be in a good print state and using this substrate as a master substrate, and using this imaging means as a whole area for the master substrate There is a method of recognizing a printed portion based on the captured image and performing image processing to create inspection data (for example, Patent Document 1).
JP 2002-029033 A

  However, in the conventional method as described above, when creating the inspection data, it is necessary to image the entire area of the screen mask or the master substrate by the imaging means. In order to create precise inspection data for performing highly accurate inspection by such a method, it is necessary to use a relatively high resolution as the imaging means, and accordingly, the opening portion or the printed portion is printed. It takes a long time to recognize the part and the image processing.

  On the other hand, if the speed is increased in order to shorten the time required for the recognition of the opening portion or the printed portion and the image processing, the resolution of the image that can be picked up decreases, and the accuracy during the inspection decreases.

  In addition, as another method, it is generally performed that data for mask creation is used and data for inspection is created from the data for mask creation by data conversion. However, when the data for mask creation is not available This method is not available.

  In view of such circumstances, the present invention does not require mask creation data, and moreover, a method for quickly creating inspection data capable of performing high-accuracy inspection, and using this inspection data It is an object of the present invention to provide a screen printing inspection apparatus capable of performing inspection.

The present invention relates to a method for creating inspection data for inspecting at least one of a printed pattern and a screen mask of an electric circuit board on which solder is printed by screen printing , and is an imaging target comprising the screen mask or the electric circuit board As an image pickup means for picking up an object, a first image pickup means capable of obtaining an image of the object to be picked up at a high speed with a relatively low resolution, and a high resolution but a low speed compared with the first image pickup means. A second imaging unit that obtains an image of the imaging object, the electrical circuit board is imaged by the first imaging unit, and the electrical circuit board is based on the image obtained by the first imaging unit. It recognizes the position of the print part of, to specify the range to be obtained detailed images, position of the opening portion of the screen mask that corresponds to the range that is specified above By imaging by the second imaging means, in which the acquired detailed image data about the opening amount, characterized by creating the test data based on the detailed image data There is .

According to this method, the opening portion of the screen mask corresponding to the designated range for quickly recognizing the position of the printed part of the electric circuit board using the first imaging means and acquiring a detailed image from the position. min Ri by the be imaged by the second imaging means, it is possible to quickly obtain detailed image data for the upper Symbol aperture.

  Therefore, it is possible to quickly create inspection data capable of performing a highly accurate inspection.

The present invention also relates to a screen printing inspection apparatus for creating test data for testing at least one of the print pattern and the screen mask of an electrical circuit board on which the solder is printed by screen printing, screen mask or electrical As an imaging means for imaging an imaging object comprising a circuit board, a first imaging means capable of obtaining an image of the imaging object at a high speed with a relatively low resolution, and a comparison with the first imaging means A second imaging unit that obtains an image of the object to be imaged at a low speed at a high speed, the electric circuit board is imaged by the first imaging unit, and the screen mask is obtained by the second imaging unit. together but being imaged being adapted to imaging data is processed is sent to the image processing unit by the two imaging means, the Based on the position of the print part of the electric circuit board which is recognized from the captured data in one of the imaging means, the range should acquire detailed images is designated, a screen mask corresponding to the specified range an opening portion together with the second imaging means for imaging a, whereby based on the detailed image data for the opening portion thus obtained, the image processing means and Turkey to create data for the inspection It is a feature.

According to this configuration, by using the above SL first imaging unit quickly recognizes the position of the printed portion of the electric circuit board, the screen mask that corresponds to the specified range in order to obtain detailed images from the an opening amount captured by the second imaging means, for the detailed image data captured can create the test data based on, quickly test data that can be performed with high accuracy inspection Can be created.

The screen printing inspection apparatus according to the present invention further includes third imaging means for capturing an image of the electric circuit board on which the solder is printed by screen printing and obtaining inspection data for inspecting the printed pattern of the electric circuit board. The image processing means has a function of inspecting the printed pattern of the electric circuit board by comparing the inspected data obtained by the third image pickup means with the inspection data created by the image processing means. More preferably.

According to this configuration, since the printed pattern of the electric circuit board can be inspected using the inspection data that can be inspected with high accuracy, it is possible to inspect with higher accuracy.

  Still further, in the screen printing inspection apparatus of the present invention, it is more preferable that the third imaging unit and the first imaging unit are the same imaging unit.

  According to this configuration, since the third imaging unit and the first imaging unit are the same, the number of components can be reduced, and the manufacturing cost of the entire apparatus can be reduced.

  The present invention also provides the above-described screen printing inspection apparatus, supporting means for supporting the printed matter, and a printing unit for printing the paste by pushing the paste from the opening portion of the screen mask with a squeegee while the screen mask is disposed on the printed matter. A screen printer with an inspection function characterized by comprising

  As described above, according to the present invention, detailed image data of the opening portion of the screen mask or the printed portion of the printed matter is quickly obtained using the first imaging unit and the second imaging unit. be able to. That is, it is possible to quickly create inspection data capable of performing a highly accurate inspection.

  Preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a screen printing machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the screen printing machine.

  The printing machine 1 includes a frame 10, a printing unit 20, a table unit 30 (supporting means), an inspection unit 40, and a control unit 50 (see FIG. 3).

  The frame 10 forms an outer frame of the printing press 1, and includes a base 11 formed in a substantially rectangular parallelepiped shape disposed at the lower end portion, and four columns 12 upright from four corners on the upper surface of the base 11. The upper frame 13 is connected to the pillar 12, the cross bar 14 is connected to the upper frame 13, and the like.

  A printed circuit board (electric circuit board) W is carried into and out of the printing machine 1 in the X-axis direction (a direction orthogonal to the paper surface in FIG. 1) by a substrate transport device (not shown). One side from the middle part of the printing machine 1 in the Y-axis direction (left-right direction in FIG. 1) is a printing area, the opposite side is an inspection area, a printing unit 20 is arranged in the printing area, and an inspection unit is in the inspection area. 40 is arranged.

  The printing unit 20 is for performing screen printing, and is arranged at a position located in front of the printing machine 1 and includes a squeegee 21. Below the squeegee 21, a screen mask M having an opening formed in accordance with the print pattern is detachably attached.

  The table unit 30 includes a Y-axis table 31, an X-axis table 32, an R-axis table 33, an elevating table 34, and a clamp 35 in order from the bottom. The lower end of the Y-axis table 31 is slidably fitted to a rail 11a disposed on the base 11, and can be moved in the Y-axis direction by a Y-axis servo motor 61 (see FIG. 3). ing. The rail 11a is arranged over the printing area and the inspection area, so that the table unit 30 can move between the two areas. In FIG. 1, the state arranged in the print area is shown by a solid line, and the state arranged in the inspection area is shown by a two-dot chain line.

  The X-axis table 32 is disposed on the Y-axis table 31 and can be moved in the X-axis direction by an X-axis servomotor 62 (see FIG. 3). The R-axis table 33 is disposed on the X-axis table 32 and can be rotated on a horizontal plane by an R-axis servo motor 63. The lift table 34 is disposed on the R-axis table 33 and can be lifted and lowered by a Z-axis servo motor 64 (see FIG. 3). A clamp 35 is disposed on the lifting table 34. The clamp 35 fixes the printed circuit board W on the table unit 30 by sandwiching the side surface of the printed circuit board W (electric circuit board), and only the printed circuit board W is transported by the transport means by releasing the sandwiched state. Make it possible.

  That is, the upper end portion of the table unit 30 can be moved in the X-axis, Y-axis, and Z-axis directions and can be rotated on a horizontal plane, and the printed circuit board W is disposed on the upper end portion in a detachable state. It has become so.

  The inspection unit 40 images the printed circuit board W, and is attached to the crossbar 14 provided in the print area of the frame 10, and includes a substrate recognition camera 41 and a print inspection camera 42 (first imaging means, Third imaging means).

  The board recognition camera 41 recognizes a fiducial mark printed on the printed board W, and recognizes the arrangement position of the printed board W by recognizing this mark.

  The print inspection camera 42 images the printed circuit board W, and recognizes the print pattern of the printed circuit board W by this imaging. The print inspection camera 42 is capable of obtaining an image at a relatively high speed. Specifically, a camera having a relatively wide viewing angle is used. By using this print inspection camera 42, when the printed circuit board W is sequentially imaged and synthesized for each area corresponding to the viewing angle and an image of the entire printed circuit board W is obtained, the number of times of imaging is smaller than that with a narrow viewing angle. Thus, an image of the entire printed circuit board W can be obtained at a relatively high speed.

  In addition to the cameras 41 and 42 provided in the inspection unit 40, a mask recognition camera 43 (second imaging means) is provided in the table unit 30.

  The mask recognition camera 43 captures an image of the screen mask M and recognizes an opening portion of the screen mask M, and is mounted on the lifting table 34 so as to face upward. The mask recognition camera 43 has a narrower viewing angle and a higher resolution than the print inspection camera 42. However, since a high-resolution image is used, the image acquisition speed is low.

  The control unit 50 controls the operation of the printing press 1, and as shown in FIG. 3, the main control unit 51, the motor control circuit 52, the imaging circuit 53, the printing unit control circuit 54, and the input unit. And an output device control circuit 55.

  The main control unit 51 serves as a center for controlling the printing press 1, and includes a calculation unit 51a and a storage unit 51b.

  The calculation unit 51 a is a so-called CPU, and performs calculations related to the control of the printing press 1. The storage unit 51b is a so-called memory, and stores a program necessary for controlling the printing press 1, control data serving as a control reference, and the like. And the calculating part 51a reads the program and control data which were stored in the memory | storage part 51b suitably, calculates the information input from each control circuit 52-56 using these programs and control data, and this calculation result is obtained. These machine elements are controlled by transmitting to various machine elements through each control circuit 52-56.

  The motor control circuit 52 is connected to the Y-axis servo motor 61, the X-axis servo motor 62, the R-axis servo motor 63, and the Z-axis servo motor 64, and receives control data from these servo motors 61 to 64. While transmitting to the calculating part 51a, the control data from the calculating part 51a are transmitted with respect to the said servomotors 61-64. That is, the operation of the servo motors 61 to 64 is controlled by the calculation unit 51a.

  The imaging circuit 53 is connected to the substrate recognition camera 41, the print inspection camera 42, and the mask recognition camera 43. The imaging circuit 53 transmits images captured by these cameras 41 to 43 to the calculation unit 51a, and also calculates the calculation unit. Control data from 51a is transmitted to the cameras 41-43. That is, the operations of the cameras 41 to 43 are controlled by the calculation unit 51a. The image captured by the print inspection camera 42 and the mask recognition camera 43 can be subjected to image processing by the arithmetic unit 51a using a program stored in the storage unit 51b. That is, the main control unit 51 and the imaging circuit 53 constitute an image processing unit.

  The printing unit control circuit 54 is connected to machine elements constituting the printing unit 20 such as an actuator for squeegee driving provided in the printing unit 20, and calculates control data from these machine elements as an arithmetic unit. While transmitting to 51a, the control data from the calculating part 51a are transmitted with respect to the said machine element. That is, the operation of the mechanical element is controlled by the calculation unit 51a.

  The input / output device control circuit 55 is connected to various input / output devices such as a monitor 71, a sensor, and a keyboard, and transmits control data from the input devices of these input / output devices to the arithmetic unit 51a. At the same time, the control data from the calculation unit 51a is transmitted to the output device among the input / output devices.

  Next, a procedure for creating inspection data used for the printing machine 1 will be described with reference to FIG.

  First, the printed circuit board W is carried onto the table unit 30 (step S1), and then the Y-axis servo motor 61 is operated to move the table unit 30 to the inspection area (step S2: the two-dot chain line in FIG. 1). reference).

  In step S3, the printed circuit board W is imaged at a relatively high speed using the print inspection camera 42, and an image of the printed circuit board W is acquired. The acquired image is transmitted to the calculation unit 51a via the imaging circuit 53. The calculation unit 51a stores the data of the image in the storage unit 51b and the input / output device control circuit 55. An image is displayed on the monitor 71 (step S4).

  Based on the image displayed on the monitor 71, the operator recognizes the location where the solder is printed, and in order to obtain a detailed image for the portion where the solder is printed, the range in which the detailed image is acquired is defined by the keyboard and mouse. It designates using input devices, such as (step S5).

  Then, the position of the screen mask M corresponding to the specified range is calculated and recognized by the calculation unit 51 a while moving the table unit 30 to the printing area side, and the recognized portion is imaged using the mask recognition camera 43. Then, a detailed image for creating the inspection pattern is acquired. That is, the position of the opening portion of the screen mask M corresponding to the portion on which the solder is printed is recognized by the calculation unit 51a, and the opening portion of the recognized screen mask M and its periphery are imaged to obtain a detailed image. (Step S6).

  Thereafter, based on the images obtained from the print inspection camera 42 and the mask recognition camera 43, the arithmetic unit 51a performs image processing using a program stored in the storage unit 51b to create inspection data (step S7). ).

  Based on the inspection data, the calculation unit 51a determines the imaging point of the board recognition camera 41 at the time of the inspection of the printed board W, and stores this point in the storage unit 51b (step S8), and then the image at each imaging point. Processing conditions (for example, threshold value, light quantity, etc.) are set (step S9), and inspection execution conditions (for example, inspection determination allowable value, timing for performing inspection, etc.) are determined (step S10).

  In step S11, a print inspection trial of the printed circuit board W is performed. If the result is good (YES in step S12), the creation of the inspection data is finished, and the trial result is bad (NO in step S12). ), Step S9 to step S11 are repeatedly executed while correcting the image processing condition and the inspection change condition until a good trial result is obtained.

  The inspection data created using such a procedure is used as follows when inspecting the printed circuit board W.

  First, the printed circuit board W to be inspected is imaged by the print inspection camera 42, and the data of the imaged image is transmitted to the computing unit 51a as data to be inspected. And in the calculating part 51a, the said test data stored in the memory | storage part 51b are collated with the said to-be-inspected data, and it is determined whether the position of the solder printed on the said printed circuit board W is within a specification. judge.

According to the above configuration, quickly acquires an image of the printed circuit the substrate W, recognizes the solder printed箇plant on the basis of the image, obtaining detailed images from the using the print inspection camera 42 Since the detailed image data about the opening portion of the screen mask M can be acquired by imaging the opening portion of the screen mask corresponding to the designated range with the mask recognition camera 43, the entire area of the screen mask M is uniformly obtained. Compared with a method for obtaining detailed image data, detailed image data of the opening and the printed portion can be obtained quickly.

  Accordingly, it is possible to quickly create inspection data that can accurately inspect the solder printing position of the printed circuit board W.

  Therefore, since the printing position of the solder on the printed circuit board W can be inspected using inspection data with high accuracy, it becomes possible to perform inspection with higher accuracy.

  The print inspection camera 42 not only obtains an image for creating inspection data, but also obtains show inspection data for inspecting the printed circuit board W, so that parts can be shared. Thus, the number of parts can be reduced, and the manufacturing cost of the entire printing press 1 can be reduced.

  The above-described embodiment is a method of indirectly generating inspection data for the printed circuit board W based on the imaging data of the opening portion of the screen mask M for screen printing.

  In addition, the specific structure of the present invention is not limited to the above embodiment, and can be variously changed.

Other embodiments
(1) In the above embodiment, the print inspection camera 42 has obtained an image of the printed circuit board W using a first imaging means, it is not always necessary to acquire an image of the printed circuit board W by the printing inspection camera 42 Alternatively, a scanner may be used as the first imaging unit. For example, as shown in FIG. 5, a computer 81 such as a personal computer and a scanner 82 are used. The scanner 82 scans the printed circuit board W and stores the image data of the printed circuit board W in the computer 81. By transmitting the image data to the printing machine 1, the image of the printed circuit board W may be taken into the printing machine 1. Further, as shown in FIG. 6, a scanner 82 may be directly connected to the printing machine 1, and image data of the printed board W may be taken into the printing machine 1 by scanning the printed board W with the scanner 82. .

  Further, in FIG. 5, inspection data may be created from the image of the printed circuit board W by the computer 81, and the inspection data in the computer 81 may be transmitted to the printing machine 1 or a printing inspection dedicated machine.

(2) In the above embodiment, the range for acquiring a detailed image is specified by manual input by an operator as shown in step S5. However, such a specification may be automatically performed by the calculation unit 51a. . In such a case, the work load can be reduced.

(3) The above embodiment is applicable not only when inspecting the printed circuit board W but also when inspecting the opening state of the opening portion of the screen mask M.

  That is, as another embodiment, the imaging point of the screen mask M is imaged by the mask recognition camera 43 every time printing is performed on a predetermined number of substrates, and changes due to solder in the opening portion and dirt due to solder around the opening portion are inspected. Thus, the print inspection of the printed circuit board W may be indirectly performed, and further, the necessity of cleaning work for the screen mask M may be determined based on the inspection result. In this case, in the steps corresponding to Step S8 to Step S10, the determination of each imaging point at the time of inspection of the screen mask M by the mask recognition camera 43, the image processing condition and the inspection execution condition at each imaging point are determined. Thus, the inspection data for the screen mask M is created without performing steps S11 to S12.

  Moreover, it is applicable also when inspecting the printed matter by various screen printing.

1 is a front view schematically showing an entire screen printing machine according to an embodiment of the present invention. 1 is a plan view schematically showing an entire screen printing machine according to an embodiment of the present invention. It is a block diagram which shows the control part of the screen printer concerning one Embodiment of this invention. It is a flowchart which shows the procedure for producing the data for an inspection concerning one Embodiment of this invention. It is the schematic which shows another example of a 1st imaging means. It is the schematic which shows another example of a 1st imaging means.

1 Printing machine (screen printing machine)
20 Printing unit 21 Squeegee 30 Table unit (supporting means)
42 Print inspection camera (first imaging means, third imaging means)
43 Mask recognition camera (second imaging means)
51 Main control unit (image processing means)
53 Image pickup means control circuit (image processing means)
M screen mask W a printed circuit board (electrical circuit board)

Claims (5)

A method for creating inspection data for inspecting at least one of a printed pattern and a screen mask of an electric circuit board on which solder is printed by screen printing,
As an imaging means for imaging an imaging object comprising a screen mask or an electric circuit board, a first imaging means capable of obtaining an image of the imaging object at a high speed with a relatively low resolution, and the first imaging means Using a second imaging means that obtains an image of the object to be imaged at a low speed compared with the resolution,
Imaging the electrical circuit board by the first imaging means,
Based on the image obtained by the first imaging means, the position of the printed part of the electric circuit board is recognized, and a range in which a detailed image is to be acquired is specified.
The position of the opening portion of the screen mask that corresponds to a range that is the designated by imaging by the second imaging means, obtains the detailed image data with in the opening amount,
A method for creating inspection data, wherein the inspection data is created based on the detailed image data. A screen printing inspection device for creating inspection data for inspecting at least one of a printed pattern and a screen mask of an electric circuit board on which solder is printed by screen printing,
  As an imaging means for imaging an imaging object comprising a screen mask or an electric circuit board, a first imaging means capable of obtaining an image of the imaging object at a high speed with a relatively low resolution, and the first imaging A second imaging means that obtains an image of the imaging object at a low speed but with a higher resolution than the means,
  The electrical circuit board is imaged by the first imaging means, the screen mask is imaged by the second imaging means, and the data imaged by the both imaging means is transmitted to the image processing means for processing. Is supposed to be
  When a range in which a detailed image is to be acquired is designated based on the position of the printed portion of the electric circuit board recognized from the data imaged by the first imaging means, it corresponds to the designated range. The second imaging means images the opening portion of the screen mask, and the image processing means creates the inspection data based on the detailed image data about the opening portion obtained thereby.
  An inspection apparatus for screen printing characterized by the above. A third image pickup means for obtaining an inspection data for inspecting the printed pattern of the electric circuit board by imaging the electric circuit board on which the solder is printed by screen printing;
  The image processing means has a function of inspecting the printed pattern of the electric circuit board by collating data to be inspected obtained by the third imaging means with the inspection data created by the image processing means.
  The screen printing inspection apparatus according to claim 2. 4. The screen printing inspection apparatus according to claim 3, wherein the third imaging means and the first imaging means are the same imaging means. Inspection apparatus for screen printing according to any one of claims 2 to 4,
  A support means for supporting the printed matter;
  A printing unit that prints the paste by pushing the paste from the opening portion of the screen mask with a squeegee in a state where the screen mask is arranged on the printed matter
  A screen printing machine with an inspection function.

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