JPH1140983A - Board mark recognition device - Google Patents

Abstract

(57) Abstract: Provided is a board mark recognition device that accurately recognizes whether a board mark is marked on a circuit board. A plurality of illumination light sources having different color tones are provided.
Imaging ranges 8a to 8 on the circuit board 10 illuminated by
d is captured by the camera 5, and the captured image is processed by the image processing unit 6 to determine whether or not the board mark 10 is marked on the circuit board 10. When illuminating with the substrate mark 2 or a color tone light having a complementary color relationship with the color of the substrate surface, the luminance difference between the substrate mark 2 and the substrate surface becomes large. Is selectively turned on, or the illuminance of each of the illumination light sources 11 to 13 is adjusted to mix colors with the color light having the maximum luminance difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board mark recognizing device for detecting the presence or absence of a board mark such as a bad mark marked on a circuit board on which components are mounted by an electronic component mounting machine.

[0002]

2. Description of the Related Art As an example of a board mark to be marked on a circuit board, a bad mark indicating a defect is used for detecting the presence or absence of the circuit mark. When a defective circuit pattern is detected in the circuit pattern inspection step in the case of a multiple-panel substrate that has been developed into a plurality of pieces, the bad mark is marked at a predetermined position of the circuit pattern. When carrying this multi-panel board into an electronic component mounting machine and performing component mounting on multiple circuit patterns at once,
The presence or absence of the bad mark is detected by the board mark recognition device, and the operation of mounting the electronic component is controlled so that the component mounting is not performed on the defective circuit pattern having the bad mark.

FIG. 4 shows a conventional structure of the board mark recognition device, which is provided above a carry-in line 7 for a process of mounting a multi-faced board 10 on an electronic component. The board mark recognition device 20 captures a predetermined imaging range 8a to 8d including a marking position of the bad mark 2 set at a predetermined position of each of the plurality of circuit patterns 9a to 9d formed on the multiple substrate 10. A camera 25 to perform image processing of the image captured by the camera 25 and each of the imaging ranges 8a to 8
The image processing unit 26 determines whether or not the bad mark 2 is marked in the area d, an illumination light source 23 for illuminating the imaging ranges 8a to 8d, and an illumination power supply 24 for the illumination light source 23. ing. The bad mark recognition operation by the board mark recognition device 20 having this configuration is executed as follows.

First, an image pickup area 8 illuminated by the illumination light source 23 in a state where the bad mark 2 has not been marked in advance (any of 8a to 8d may be used because they are all under the same conditions) is imaged by the camera 25, and this image pickup is performed. The image is input to the image processing unit 26. The image processing unit 26 calculates the luminance of the input captured image within the imaging range 8 and stores the luminance calculation data without the bad mark 2.

Next, the respective imaging ranges 8a to 8d of the multiple board 10 carried into the component mounting process are sequentially imaged by the camera 25 under the same conditions, and the captured images are input to the image processing unit 26. The image processing unit 26 calculates the luminance of the input captured image and compares it with the stored luminance data without the bad mark 2. In the state where the bad mark 2 is not marked, the brightness in the imaging ranges 8a to 8d is uniform, but as shown in FIG. 5, when the bad mark 2 is marked in the imaging ranges 8a to 8d, , The difference in the luminance level is detected based on the presence or absence of the bad mark 2. Therefore, when the difference between the luminance levels is equal to or more than the predetermined value, it can be recognized that the bad mark 2 is marked.

When the bad mark 2 is detected in the circuit patterns 9a to 9d by the bad mark detection processing, the data of the bad mark detection is transmitted to the component mounting process, whereby the circuit pattern is detected. Component mounting is not executed for the ones marked with bad marks in 9a to 9d, and wasteful component mounting is eliminated and productivity is improved.

[0007]

However, in the illumination light source 23 in the above-mentioned conventional configuration, the color tone and illuminance of the illumination light are fixed, and the color tone of the seal or ink marked as the bad mark 2 is various. In some cases, a difference in luminance level until the mark 2 can be recognized cannot be obtained, and there has been a problem that an operation of detecting the presence or absence of the bad mark 2 is erroneously recognized.

It is an object of the present invention to provide a board mark recognition apparatus with improved recognition accuracy for detecting the presence or absence of a board mark.

[0009]

A first aspect of the present invention for achieving the above object illuminates a predetermined imaging range including a marking position of a board mark set at a predetermined position on a circuit board, and adjusts the imaging range. In a board mark recognition device that detects whether a board mark is marked at the marking position by detecting a luminance difference between a board surface of a captured image and a marking position of the board mark, the color tone of the board mark or A complementary color light source for illuminating the imaging range with illumination light having a color complementary to the color of the substrate surface is provided.

According to the above configuration, when the complementary color light source illuminates the imaging range by illuminating with the illumination light having a color complementary to the color of the substrate mark or the color of the substrate surface,
Since the luminance in the captured image on the side having a complementary color relationship with the color tone of the illumination light decreases, the luminance difference between the substrate mark and the substrate surface increases, and when the substrate mark is marked at the marking position, it is marked. The difference from when there is no board mark becomes clear, and the recognition accuracy for determining whether or not the board mark is marked can be improved.

The second invention of the present application illuminates a predetermined imaging range including a marking position of a substrate mark set at a predetermined position on a circuit board, and marks the substrate surface of the image obtained by capturing the imaging range with the marking of the substrate mark. In a board mark recognition device that recognizes whether or not a board mark is marked at the marking position by detecting a luminance difference from a position, a plurality of illumination light sources that irradiate illumination light having different tones to the imaging range. And illumination control means for controlling the lighting state of each of the plurality of illumination light sources.

According to the above configuration, the plurality of illumination light sources for irradiating illumination lights having different color tones are controlled by the illumination control means, and the plurality of illumination light sources are selectively turned on.
Alternatively, by adjusting the illuminance of each illumination light source to generate mixed-color light, it is possible to illuminate with a color tone that is complementary to or close to the color tone of the substrate mark or the surface of the substrate. Is reduced, the luminance difference between the substrate mark and the substrate surface is increased, and the recognition accuracy for determining whether the substrate mark is marked at the marking position can be improved.

[0013] The illumination control means in the above configuration can be configured to selectively light an illumination light source having a color tone that maximizes a luminance difference between the substrate mark and the substrate surface from among the plurality of illumination light sources. Since the color tone of the mark or the substrate surface can be known in advance, a plurality of illumination light sources that emit color tone light that maximizes the difference in brightness between the substrate mark and the substrate surface are provided, and the color tone of the substrate mark or the substrate surface changes. The recognition accuracy can be improved by selectively turning on the illumination light source in accordance with.

Further, the illumination control means sequentially turns on the plurality of illumination light sources, and compares the detected value of the luminance difference between the substrate mark and the substrate surface when illuminated by each of the illumination light sources, so that the luminance difference is maximized. It can be configured to automatically select the illumination light source of the color tone, and the color control light source that obtains the maximum luminance difference from the comparison of the luminance difference between the substrate mark and the substrate surface each time the plurality of illumination light sources are turned on by the illumination control means. By selecting one of the illumination light sources, it is possible to automatically select an illumination light source that emits optimal color tone light from a plurality of illumination light sources.

Further, the illumination control means can be configured so that the illuminance of each of the plurality of illumination light sources can be adjusted so that the luminance difference between the substrate mark and the substrate surface is maximized, and the plurality of illumination light sources having different color tones are provided. By adjusting the respective illuminances, it is possible to generate a color tone light having a complementary color relationship with the color tone of the substrate mark or the substrate surface by additive color mixture of light, and the substrate mark due to a decrease in luminance on the side having the complementary color relationship. The state where the luminance difference between the substrate and the substrate surface is maximized,
The recognition accuracy of the substrate mark can be improved.

Further, the illumination control means can be configured so as to sequentially change the illuminance of the plurality of light sources and automatically adjust the color mixture state so that the luminance difference between the mark and the substrate surface is maximized. By illuminating each of the plurality of illumination light sources by means and determining the illuminance of each of the illumination light sources at which the luminance difference between the substrate mark and the substrate surface is maximized by the mixed illumination light, an optimal color tone is emitted. The illuminance of each illumination light source can be automatically set.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. In the present embodiment, when a defective circuit pattern is detected in a circuit pattern inspection process of a multiple board in which a plurality of independent circuit patterns are formed on one substrate, the defective circuit pattern is detected. A bad mark is marked at a predetermined position, and the presence or absence of the bad mark is detected when the multiple substrate is transported to the electronic component mounting process, so that the component mounting is not performed on the circuit pattern having the bad mark. This is configured as a substrate mark recognition device for performing the following. That is, the target substrate mark in the present embodiment refers to the bad mark, and the same can be applied to other substrate marks marked with a seal, ink, or the like on the substrate for some kind of identification. .

FIG. 1 shows the configuration of a substrate mark recognition apparatus according to an embodiment of the present invention.
A plurality of circuit patterns 9a to 9d, which are arranged above a transfer line 7 on which a multi-panel board (circuit board) 10 is conveyed to an electronic component mounting process, and formed on the multi-panel board 10
Predetermined imaging ranges 8 a to 8 including marking positions of bad marks (substrate marks) 2 set at respective predetermined positions
A camera 5 for picking up an image 8d, an image processing unit 6 for processing a picked-up image input from the camera 5 to determine the presence or absence of the bad mark 2, and a multi-plane substrate 10 for the image pickup ranges 8a to 8d. A plurality of complementary light illuminating light sources 11 to 13 for irradiating light of a color tone having a complementary color relationship to the color of the substrate surface or the bad mark 2;
An illumination control unit (illumination control means) 4 for controlling the lighting state of each of the light emitting devices 2 and 13 is provided.

With the above configuration, the multi-panel substrate 10 conveyed on the conveying line 7 is illuminated by the complementary light illumination light sources 11 to 13 and the imaging range 8 of each of the circuit patterns 9a to 9d.
a to 8d are captured by the camera 5, and the captured image is subjected to image processing by the image processing unit 6 to recognize the presence of the bad mark 2. When the bad mark 2 is detected, the recognition data is transmitted to the electronic component mounting process. Send out.

For example, by irradiating light of a color tone having a complementary color relationship with the color tone of the substrate surface from the complementary color illumination light sources 11 to 13, the luminance of the substrate surface having a complementary color relationship with the illumination light is reduced. The luminance difference between the bad mark 2 and the substrate surface in the image captured by the camera 5 increases,
The existence of the bad mark 2 can be clearly recognized.
As shown in a specific example, when the color tone of the substrate surface of the multiple substrate 10 is green and the bad mark 2 is marked in red, the complementary color illumination light sources 11 to 13 emit red light which is a complementary color to the green color of the substrate surface. When illumination light is set to be applied and the imaging range 8a to 8d is captured using a monochrome CCD camera as the camera 5, the bad mark 2 on the captured image has high luminance due to the same color illumination light, while ,
Since the luminance of the substrate surface having a complementary color relationship is low, the luminance difference between the bad mark 2 and the substrate surface is large.

By performing the operation of recognizing the bad mark 2 on the multiple substrate 10 by using the substrate mark recognizing device 1 having the above-described configuration, the luminance difference between the substrate surface and the bad mark 2 is emphasized. The accuracy of recognition of the mark 2 is improved, and the production of a board that does not execute useless component mounting in the component mounting process is realized by bad mark recognition without erroneous recognition.

The configurations of the first to fourth embodiments in which the complementary color illumination light sources 11 to 13 emit complementary light corresponding to the bad tone of the bad mark 2 or the substrate surface will be described below.

(First Embodiment) In FIG. 1, the color tone of the light emitted from the complementary color illumination light sources 11 to 13 is configured to be different from each other, so that the color tone has a complementary color relationship with the color tone of the bad mark 2 or the substrate surface. Complementary light source 1 for irradiating light
A switching operation is performed from the illumination control unit 4 so that any one of 1, 12, and 13 is turned on. For example, when the complementary light illumination light source 11 is configured to emit red light, the complementary light illumination light source 12 is green, and the complementary light illumination light source 12 is configured to emit blue light,
In a state where the bad mark 2 is marked in red on the green substrate surface, the complementary light illumination light source 1 that emits red light
When the illumination control unit 4 is operated so that 1 lights up, the luminance of the green substrate surface which is complementary to the red light decreases,
Since the luminance difference from the red bad mark 2 becomes large, when a monochrome CCD camera is adopted as the camera 5,
When the image processing unit 6 performs image processing, a large difference occurs between the brightness levels of the bad mark 2 and the substrate surface, and the imaging ranges 8a to 8
When the luminance level within d is calculated, a clear difference is detected in the calculated value depending on whether or not the bad mark 2 is marked, so that highly accurate bad mark recognition is realized.

The complementary color illumination light sources 11 to 13 shown in FIG.
Although an example is shown in which the LEDs are configured with LEDs of each emission color, a colored lamp, a lamp having a color filter, or the like can also be used. Further, it is possible to arrange more light sources by changing the color tone of the light to be irradiated. Since the color tone of the substrate surface and the color tone of the bad mark 2 can be known in advance, the complementary color light corresponding to each color tone number can be known. Can be configured using a plurality of light sources that irradiate light.

The camera 5 may be a color camera or an optical sensor. Further, by providing a filter or the like that selectively transmits only light in a specific wavelength band, the luminance difference can be further emphasized.

(Second Embodiment) In the first embodiment, it is a manual operation to select the optimum color tone light source from the plurality of complementary color illumination light sources 11 to 13; The configuration is such that an optimal color light source can be selected by operation. The procedure for controlling the automatic selection will be described below with reference to the flowchart of FIG. Note that this processing procedure is executed by the illumination control unit 4. Also, S1, S2... Shown in FIG.

Before describing the processing procedure, the symbols described in the flowchart will be described.

The variable D (i) is the illumination light source 11, 1
2 and 13 are individually turned on to indicate the absolute value of the luminance difference between the bad mark 2 and the substrate surface in the image data picked up by the camera 5, and i represents each complementary color illumination light source 11, 12, 1
3, for example, D (11) is a complementary color light source 11
Is the absolute value of the luminance difference when is turned on. The variable Dmax indicates the maximum value of D (i).

First, D (11), D (12), D (1
In order to initialize 3) and Dmax, 0 is input to each (S1). Next, in order to execute a loop three times for each of the complementary light illumination light sources 11 to 13 using the variable i as a repetition variable, first, control is performed so that i is 11, that is, the complementary light illumination light source 11 is turned on. Each time, as i + 1, the lighting of the complementary color illumination light sources 12, 13 is sequentially switched (S2). The complementary-color illumination light source i (the first-time complementary-color illumination light source 11) that is lit by this processing is lit and the multi-panel substrate 10 is illuminated with the color tone set to the complementary-color illumination light source i (S3), so that the imaging range 8 ( All of the conditions are the same, and any of 8a to 8d may be used).

The picked-up image is input to the image processing unit 6, and the image processing unit 6 calculates the absolute value D (i) of the luminance difference between the bad mark 2 and the substrate surface (S4). Initial absolute value D
(I) = D (11). This operation value D (i) is represented by Dm
a (D) is input as Dmax (S6), and Dma is input if D (i)> Dmax.
D (i) indicating x is stored. In the first loop, since Dmax = 0 due to the above initialization, since D (i)> Dmax, i = 11 is stored, and D (11) is stored as Dmax.

Returning to the step (S2), i + 1 is set as i.
Is input, the complementary light illumination light source 12 is turned on, and the processing of executing steps (S4) to (S6) is repeated. Similarly, the complementary light illumination light source 13 is similarly repeated.
The i that has reached max is turned on (S7). When the number of the complementary color illumination light sources 11 to 13 is larger than that of the configuration of the present embodiment, by executing the same repetitive processing, a light source having a color tone that can obtain the maximum luminance difference between the bad mark 2 and the substrate surface is obtained. Can be selected automatically.

(Third Embodiment) In FIG. 1, the complementary color light sources 11 to 13 are configured to irradiate different color tones, and the illumination control unit 4 controls the complementary color light sources 11 to 13 respectively. Are configured so that the illuminance of each can be adjusted individually. For example, the complementary light illumination light source 11 is formed as a light source that emits red light, the complementary light illumination light source 12 is formed as a light source that emits green light, and the complementary light illumination light source 13 is formed as a light source that emits blue light. By adjusting the illuminance, the multi-panel substrate 10 can be illuminated with illumination light of a desired color tone by additive color mixture of light.

With the above configuration, each of the complementary color light sources 11 to 11
13 to adjust the illuminance of the substrate surface or bad mark 2
When the illumination can be performed with the color tone and the complementary color relationship or the color tone light close to the complementary color relationship, the state where the luminance difference between the substrate surface and the bad mark 2 is largest is obtained, and the presence or absence of the bad mark 2 can be accurately determined from the image captured by the camera 5. Can be well recognized.

Since the color tone of the substrate surface of the multi-cavity substrate 10 and the color tone of the bad mark 2 can be known in advance, each complementary color illumination light source 11 which can obtain the maximum luminance difference from the combination of the color tone of the substrate surface and the bad mark 2 can be obtained. By acquiring experimentally the illuminance adjustment data of Nos. To 13 in advance and storing the data in the illumination control unit, each of the complementary light illumination light sources 11 to 13 is turned on in an optimal illuminance adjustment state from the combination of the color tones. You can also.

(Fourth Embodiment) In the third embodiment, the illuminance adjustment for obtaining the optimum color light from the plurality of complementary light illumination light sources 11 to 13 is a manual operation. The illuminance can be adjusted to a state where optimal color light can be obtained by an operation. The processing procedure for controlling the automatic illuminance adjustment will be described below with reference to the flowchart in FIG. Note that this processing procedure is executed by the illumination control unit 4. Also, S11 and S1 shown in FIG.
2 are step numbers of the processing procedure, which coincide with the numbers described in the text.

Before describing the processing procedure, the symbols described in the flowchart will be described.

The variable D ₀ indicates the absolute value of the luminance difference between the bad mark 2 and the substrate surface in the image data captured by the camera 5, and Dmax indicates the maximum value of D ₀ . Further, a variable R indicates a complementary light illuminating light source 11 for irradiating red light, a variable G indicates a complementary light illuminating light source 12 for irradiating green light, and a variable B indicates a complementary light illuminating light source 13 for irradiating blue light.
The numerical value of 5 indicates the illuminance of each of the complementary light illumination light sources 11, 12, and 13 for irradiating the R, G, and B colors.

First, to initialize D ₀ and Dmax, 0 is input to each of them (S11). Next, R,
Complementary color illumination light sources 11, 12, 13 for irradiating G and B colors
Are sequentially changed from 0 to 255 (S12 to S1).
4), in each case, the image processing unit 6 from the image captured by the camera 5 to measure the brightness difference of the bad mark 2 and the substrate surface, and calculates the absolute value D ₀ of the luminance difference (S1
5). The absolute value D ₀ of the computed luminance difference is compared to Dmax (S16), D ₀ is when a D _0> Dmax
Is input as the maximum value Dmax of the luminance difference, and R, G, and B indicating this Dmax are stored (S
17).

The above procedure is repeated every time the illuminance is increased in the order of B, G, and R. When the illuminance of R finally reaches 255, R, R, which is finally stored as the maximum value Dmax of the luminance difference,
Illumination light of a color tone mixed with the illuminance of each of G and B is determined, and recognition of the bad mark 2 is started in a state of being illuminated thereby (S18).

In the above processing procedure, the illuminance is changed in 255 steps. However, the present invention is not limited to this. The illuminance can be set arbitrarily in consideration of processing time, recognition accuracy, and the like. Further, the color tone of the light emitted from each of the complementary color illumination light sources 11 to 13 may be configured by combining other color tones or increasing the number of light sources.

[0041]

As described above, according to the first aspect of the present invention, the imaging range is illuminated from the complementary color illumination light source with illumination light having a color complementary to the color of the substrate mark or the color of the substrate surface. When the image is taken, the luminance on the side that is in a complementary color relationship with the illumination light on the substrate mark or the substrate surface in the captured image decreases, so the luminance difference between the substrate mark and the substrate surface increases,
There is a large difference in the luminance difference between the marking position and the substrate surface between when the substrate mark is marked at the marking position and when it is not marked, and the recognition accuracy for determining whether the substrate mark is marked is improved. Can be improved.

According to the second aspect of the present invention, a plurality of illumination light sources for irradiating illumination lights having different color tones are controlled by the illumination control means to selectively light the plurality of illumination light sources, or By adjusting the illuminance of the illumination light source to generate mixed-color light, it is possible to illuminate with a color tone that is complementary to or close to the color tone of the substrate mark or the substrate surface, so that the luminance on the side with the complementary color relationship decreases. Therefore, the luminance difference between the substrate mark and the substrate surface increases,
It is possible to improve recognition accuracy for determining whether or not the substrate mark is marked at the marking position.

The plurality of illumination light sources are selectively turned on,
Alternatively, the operation of adjusting the illuminance of each illumination light source to generate mixed-color light can be adjusted to an optimal state by automatic control by the illumination control unit, eliminating setting variations due to manual operation, and enabling stable recognition. Can be set to

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a substrate mark recognition device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure for automatically selecting an optimal illumination light source from a plurality of illumination light sources having different color tones.

FIG. 3 is a flowchart showing a processing procedure for automatically adjusting the illuminance of each of a plurality of illumination light sources having different color tones so as to obtain optimal color light.

FIG. 4 is a perspective view showing a configuration of a substrate mark recognition device according to the related art.

FIG. 5 is a diagram illustrating detection of a luminance difference between a bad mark and a substrate surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Board mark recognition apparatus 2 Bad mark (board mark) 4 Illumination control part (illumination control means) 5 Camera 6 Image processing part 7 Carry-in line 8a-8d Imaging range 9a-9d Circuit pattern 10 Multi-panel board (circuit board) 11- 13 Complementary color illumination light source

Claims (6)

[Claims] 1. A predetermined imaging range including a marking position of a board mark set at a predetermined position on a circuit board is illuminated,
A board mark recognition device that recognizes whether or not a board mark is marked at the marking position by detecting a luminance difference between a board surface of an image obtained by capturing the imaging range and a marking position of the board mark. A substrate mark recognizing device, comprising: a complementary color illumination light source for illuminating the imaging range with illumination light having a color that is complementary to a color of a mark or a color of a substrate surface. 2. Illuminating a predetermined imaging range including a marking position of a board mark set at a predetermined position on a circuit board,
A board mark recognition device that recognizes whether or not a board mark is marked at the marking position by detecting a luminance difference between the board surface of the image obtained by capturing the imaging range and the marking position of the board mark. A substrate mark recognizing device, comprising: a plurality of illumination light sources for irradiating the imaging range with different illumination lights; and illumination control means for controlling a lighting state of each of the plurality of illumination light sources. 3. The illumination control means according to claim 2, wherein the illumination control means is configured to selectively light an illumination light source having a color tone with a maximum difference in luminance between the substrate mark and the substrate surface from among the plurality of illumination light sources. Board mark recognition device. 4. The illumination control means sequentially turns on a plurality of illumination light sources, compares the detected value of the luminance difference between the substrate mark and the substrate surface when illuminated by each of the illumination light sources, and determines that the luminance difference is maximum. The substrate mark recognition device according to claim 2, wherein the device is configured to automatically select an illumination light source having a different color tone. 5. The substrate mark recognition device according to claim 2, wherein the illumination control means is configured to adjust the illuminance of each of the plurality of illumination light sources so that the luminance difference between the substrate mark and the substrate surface is maximized. . 6. The illumination control means is configured to sequentially change the illuminance of a plurality of illumination light sources and automatically adjust a color mixing state so that a luminance difference between a mark and a substrate surface is maximized. The board mark recognition device described in the above.