JP5852858B2 - Terminal inspection apparatus and terminal inspection method - Google Patents

Description

  The present invention relates to a terminal inspection apparatus and a terminal inspection method for inspecting whether or not a gap between bifurcated terminals provided in a connector or the like is normal.

  For example, a bifurcated terminal is conventionally used as a terminal mounted on a connector mounted on a vehicle (see, for example, Patent Document 1). As shown in FIG. 10, the bifurcated terminal 11 (hereinafter abbreviated as “terminal 11”) has its tip branched in two directions, and its tips 11a and 11b are rounded. Further, the two tip portions 11a and 11b are provided to be separated by a gap distance d.

  Further, the terminal 11 is manufactured by press punching, and when the terminal 11 is attached to the connector housing, it is necessary to inspect whether or not the gap distance (d shown in FIG. 10) between the end portions 11a and 11b is normal. There is. Since such an inspection needs to inspect a large number of terminals in a short time, an inspection using a terminal inspection apparatus has been conventionally performed.

  FIG. 11 is an explanatory view schematically showing the configuration of a conventional terminal inspection apparatus. As shown in the figure, from the longitudinal direction (axial direction) of the terminal 11 to be measured toward the terminal 11 (arrow r1). A blue light emitting unit 12 that emits blue light, two red light emitting units 13a and 13b that emit red light from directions (arrows r2 and r3) having a predetermined angle with respect to the longitudinal direction of the terminal 11, and photographing And a camera (photographing means) 14 for photographing the light reflected by the terminal 11 (arrow r4). Note that the terminal 11 shown in FIG. 11 is a view of the bifurcated terminal 11 as viewed from the side, and when viewed from the direction of the symbol “A”, it has a bifurcated shape as shown in FIG. And each light emission part 12, 13a, 13b is controlled by control of the light irradiation part 111 provided in the controller 101. FIG.

  In addition, the image captured by the camera 14 is analyzed for blue and red regions by the image analysis unit 112, and the gap calculation unit 113 analyzes the tip portions 11 a and 11 b of the terminal 11 based on the analysis result by the image analysis unit 112. The gap distance d is measured. The pass / fail determination unit 114 determines that the measured gap distance d is a non-defective product when the measured gap distance d is a numerical value within a predetermined range, and determines that the measured product is a defective product when the measured gap distance d is not a numerical value within the predetermined range. . The determination result is displayed on the display 121. The controller 101 further includes a power supply unit 115 for supplying power.

  Next, processing in the image analysis unit 112 and the gap calculation unit 113 illustrated in FIG. 11 will be described. As described above, the blue light emitting unit 12 emits blue light from the axial direction of the terminal 11 toward the distal end direction of the terminal 11, and the two red light emitting units 13a and 13b are respectively in the axial direction of the terminal 11. The light is irradiated from a direction inclined with respect to. Accordingly, since the light is reflected in multiple directions at the rounded tip portions 11a and 11b (see FIG. 10), the images of the tip portions 11a and 11b photographed by the camera 14 are red. In addition, in the regions other than the tip portions 11a and 11b, the blue light irradiated from the axial direction is reflected and taken into the camera 14, so that the image is blue.

  As a result, the image analysis unit 112 can acquire an image in which the tip portions 11a and 11b of the terminal 11 are red and the surroundings are blue as shown in FIG. Can extract the gap distance d by extracting the red region.

  By the way, as described above, since the terminal 11 is manufactured by press punching, the cross-sectional state (the state of the side surface of the terminal 11) can often change depending on the thickness of the plate and the state of the mold at the time of press punching. Hereinafter, the relationship between the operation of the punching process and the cross-sectional state will be described.

  FIG. 12 is an explanatory view showing a state in which a material is punched by press punching. A flat metal material is placed on a die, and the punch is lowered to punch the material. That is, the material is punched in the order of FIGS. 12 (a), (b), and (c).

  FIG. 13 is an explanatory view showing a state of a cross section of the terminal 11 processed by press punching. As shown in the drawing, the cross-section when a plate-shaped metal is punched out is a sag a1 having a smooth curvature, a shear surface a2 having a glossy vertical line, a fracture surface a3 having a shape stripped of material, and It becomes a four-layer structure of burr a4 having jagged edges.

  Here, since the surface of the shear plane a2 is flat, the irradiated light is regularly reflected. That is, the blue light irradiated from the axial direction of the terminal 11 is linearly reflected and enters the camera 14. On the other hand, since the fracture surface a3 has unevenness on the surface, the irradiated light is diffusely reflected. That is, red light irradiated from a direction inclined with respect to the terminal 11 is diffusely reflected in multiple directions, and a part of the red light enters the camera 14. Therefore, in the image photographed by the camera 14, the shear plane a2 portion includes a large amount of blue component, and the fracture surface a3 includes a portion including a large amount of red component.

  On the other hand, in a press punching machine, the above four-layer structure may change greatly depending on the size of the clearance between the die and the punch (the distance between the peripheral surface of the die and the peripheral surface of the punch). Are known. Specifically, when the clearance is appropriate, the four-layer structure shown in FIG. 13 is obtained, but when the clearance is too small, a secondary shear surface a5 is generated as shown in FIG. 14 (a). To do. At this time, since the secondary shear surface a5 has many irregularities on the surface, neither red nor blue is condensed, and the entire image taken by the camera 14 becomes dark. Further, when the clearance is excessive, the area of the fracture surface a3 is widened as shown in FIG. 14B, and the image captured by the camera 14 has many red areas.

  Accordingly, as shown in FIGS. 14A and 14B, the blue and red regions of the image photographed by the camera 14 change depending on the state of the cross section of the terminal 11, and the red region and the blue region are fixed on a constant basis. If the gap distance d between the tip portions 11a and 11b is determined by determining the region, there may be a case where the measurement accuracy includes a large error, and there is a problem that measurement cannot be performed depending on the situation. Note that the side surface states shown in FIGS. 14A and 14B are both non-defective as the terminal 11 and do not cause any problem in practice.

  Further, if the die and punch clearance shown in FIG. 12 are kept constant, the above problem is reduced, but the clearance changes every time the machine tool is maintained, and it is not easy to keep it constant. .

JP 2009-245605 A

  As described above, in the conventional terminal inspection apparatus, since the light reflection characteristics change according to the state of the side surface of the terminal 11, when the gap distance d between the tips 11a and 11b is measured with the same reference, the measurement is performed. There were problems that accuracy was lowered and measurement itself could not be performed.

  The present invention has been made to solve such a conventional problem, and the object of the present invention is to provide a high-accuracy gap between the tip portions even when the state of the side surface of the bifurcated terminal changes. It is an object of the present invention to provide a terminal inspection device and a terminal inspection method capable of measuring the gap distance.

In order to achieve the above object, a terminal inspection apparatus according to claim 1 of the present application is a terminal inspection apparatus for inspecting a gap between bifurcated terminals from an axial direction parallel to the longitudinal direction of the bifurcated terminals. A first irradiating means for irradiating a first color light (for example, blue light) toward the bifurcated terminal; and a second color from the direction inclined by a predetermined angle with respect to the axial direction toward the bifurcated terminal. A second irradiating means for irradiating light (for example, red light), a first chromatic light irradiated on the bifurcated terminal, and a photographing means for photographing reflected light of the second chromatic light; and the photographing means. A gap calculating means for extracting the first color light and the second color light from the image photographed in step, and obtaining a gap distance between the bifurcated terminals based on the extraction result, the gap calculating means in response to a side surface state of the forked terminal The bifurcated hue becoming the determining threshold value as an edge portion of the tip portion of the terminal is set, based on the hue detecting the edge of the tip, a plurality of gaps for obtaining the distance between the edges of the two tips A storage unit for storing a calculation program, wherein the gap state calculation program corresponding to the determined side surface state is determined based on the extraction result of the first color light and the second color light. Is used to determine the gap distance between the forked terminals.

According to a second aspect of the present invention, the gap calculating means includes the first color included in an image of a gap area between the tips of the bifurcated terminals of the image taken by the photographing means. The side surface state is classified according to the amount of the color component of light and the color component of the second color light.

In the invention according to claim 3 , the gap calculation means divides the gap area into an upper area and a lower area by a center line in a direction parallel to a line connecting the two tip portions. The upper region or the lower region is selected as a selection area based on the color component of the upper region and the color component of the lower component, and the side surface state is determined based on the color component of the selected selection area. And

The invention according to claim 4 is characterized in that the first color light is blue light and the second color light is red light.

The terminal inspection method according to claim 5 is a terminal inspection method for inspecting a gap between the bifurcated terminals, from the axial direction parallel to the longitudinal direction of the bifurcated terminals, toward the bifurcated terminals. A first color light irradiation step of irradiating the color light of the second color light, and a second color light irradiation step of irradiating the second color light toward the bifurcated terminal from a direction inclined at a predetermined angle with respect to the axial direction; From the photographing step of photographing the first chromatic light irradiated on the bifurcated terminal and the reflected light of the second chromatic light by the photographing means, and the first colored light from the image photographed by the photographing means The second color light is extracted, and based on the extraction result, an appropriate gap calculation program is selected from a storage unit that stores a plurality of gap calculation programs according to the side surface state of the bifurcated terminal, Using this gap calculation program And a gap calculation step for determining a gap distance crotch shape terminal, the clearance calculation program, in response to said side surface state, the hue becoming the determining threshold value as an edge portion of the tip portion of the bifurcated terminal sets And a program for detecting an edge of the tip portion based on the hue and calculating a distance between the edges of the two tip portions .

According to the first and fifth aspects of the present invention, the first color light is irradiated from the axial direction of the bifurcated terminal, the second color light is irradiated from the direction inclined with respect to the axial direction, and the reflected light thereof. The edge of the tip portion of the bifurcated terminal is detected based on the image obtained by photographing the two, and the gap between the tip portions is obtained based on the edges of the two tip portions. At this time, the side shape of the tip is estimated from the captured image, and the gap is calculated using a gap calculation program corresponding to the estimated side shape. Therefore, even when the side surface state of the bifurcated terminal is different, the edge of the tip portion can be obtained with high accuracy, and it is possible to determine whether the product is good or defective with high accuracy.

Furthermore , a hue as a threshold is set in each gap calculation program, and the edge of the tip is obtained with reference to this hue, so that the distance between the edges can be obtained with high accuracy.

In the invention of claim 2 , the side surface state is classified based on the color components included in the image of the gap region between the two tip portions of the bifurcated terminal. In other words, since the color component of the gap region changes according to the side surface state of the bifurcated terminal, the side surface state can be classified with high accuracy by using this color component.

In the invention of claim 3 , the gap area is divided into an upper area and a lower area, and a selection area for determining the side face state is selected based on the color component of each area. Can be classified.

In the invention of claim 4 , since the first color light is blue light and the second color light is red light, the edge of the tip can be detected with high accuracy from the relationship between the contrast between the two, As a result, it becomes possible to obtain | require the clearance gap of a terminal front-end | tip part with high precision.

It is a block diagram which shows the structure of the terminal inspection apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows typically each terminal image of A state-D state image | photographed with the terminal test | inspection apparatus which concerns on embodiment of this invention. It is a figure which shows the hue distribution of each terminal image of A state-D state image | photographed with the terminal inspection apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows typically the image image | photographed with the terminal image | photographed with the terminal inspection apparatus which concerns on embodiment of this invention, and a clearance gap. It is a flowchart which shows the process sequence of the terminal inspection apparatus which concerns on 1st, 2nd embodiment of this invention. It is a flowchart which shows the terminal selection process of the terminal inspection apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the image area | region at the time of performing a color inspection process of the terminal inspection apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the terminal selection process of the terminal inspection apparatus which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows the image area | region at the time of performing a color test | inspection process of the terminal test | inspection apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the conventional terminal inspection apparatus. It is explanatory drawing which shows the front-end | tip part of the terminal test | inspected with the terminal test | inspection apparatus which concerns on this invention. It is explanatory drawing which shows a mode that a terminal is manufactured by press punching. It is explanatory drawing which shows the normal cross section of the terminal manufactured by press punching. It is explanatory drawing which shows the mode of a terminal cross section when the clearance of a press punching machine is large and small.

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

[Description of Configuration of First Embodiment]
FIG. 1 is a block diagram showing a configuration of a terminal inspection apparatus according to an embodiment of the present invention. As shown in FIG. 1, the terminal inspection apparatus includes a blue light emitting unit (irradiating blue light (first color light) from the longitudinal direction (axial direction) of the terminal 11 to be measured toward the terminal 11. (First irradiating means) 12 and two red light emitting sections (second irradiating means) 13 a that irradiate red light (second colored light) from a direction having a predetermined angle with respect to the longitudinal direction of the terminal 11. , 13b, and a camera (photographing means) 14 for photographing by introducing light reflected by the terminal 11. These are controlled by the controller 21.

  The controller 21 outputs a control signal to the blue light emitting unit 12 and the red light emitting units 13a and 13b to control the light irradiation, and analyzes the image captured by the camera 14 to analyze the blue light. And an image analysis unit 23 for detecting a region where red light is present, and a side surface state (details will be described later) of the terminal based on the red light region and the blue light region detected by the image analysis unit 23 And a terminal selection unit 24.

  Furthermore, a storage unit for storing a clearance calculation program for each terminal state is included, and when the terminal state is selected by the terminal selection unit 24, a clearance calculation program corresponding to the selected terminal state is read, and this clearance A gap calculation unit (gap calculation means) 25 that calculates a gap distance d between the distal end portions 11a and 11b by executing a calculation program, and this terminal according to the size of the gap distance d obtained by the gap calculation unit 25 A pass / fail judgment unit 26 that judges whether 11 is a non-defective product or a defective product. Moreover, the power supply part 27 which supplies the electric power for operating the controller 21 is provided.

  Further, the controller 21 is connected to the display device 31, and the image taken by the camera 14 and the determination result by the quality determination unit 26 are displayed on the display device 31. The controller 21 shown in FIG. 1 can be configured as an integrated computer including a central processing unit (CPU) and storage means such as a RAM, a ROM, and a hard disk.

[Terminal side condition]
Next, the relationship between the side surface state of the terminal 11 and the blue region and red region included in the image captured by the camera 14 will be described. The side surface state of the terminal 11 includes the normal state shown in FIG. 13 (hereinafter referred to as “A state”) and the state where the secondary shear surface a5 shown in FIG. 14A exists (hereinafter referred to as “B state”). ”), A state in which there are many fractured surfaces a3 shown in FIG. 14B (hereinafter referred to as“ C state ”), and a state in which the tip of the terminal 11 is blanked (hereinafter referred to as“ D state ”). Separated. The A state, the B state, and the C state are different from each other only in the state of the side surface, and are all non-defective, and the tip portion of the D state is also removed, but there is no practical problem as a terminal. Handle as good.

  FIG. 2A is an explanatory diagram showing an image taken by the camera 14 when the side surface of the terminal 11 is in the A state, and the tip portions 11a and 11b are red (however, a part on the upper side). The other part is blue.

  FIG. 2B is an explanatory diagram showing an image taken by the camera 14 when the side surface of the terminal 11 is in the B state, and the center portion of each of the tip portions 11a and 11b is an image that is dark. In addition, the gap region between the tip portions 11a and 11b is also a dark image. That is, in the B state, there is a secondary shear surface a5 (see FIG. 14B), but since there are many irregularities on this surface, the overall blue and red colors are not condensed on the camera 14. The whole image becomes dark.

  FIG. 2C is an explanatory view showing an image photographed by the camera 14 when the side surface of the terminal 11 is in the C state, the tip portions 11a and 11b are red, and the same applies to the gap region. The image is reddish.

  FIG. 2D is an explanatory view showing an image photographed by the camera 14 when the side surface of the terminal 11 is in the D state, and the hollow portions of the tip portions 11a and 11b are displayed in blue.

  And in the terminal inspection apparatus which concerns on this embodiment, it is estimated from the hue of the whole image whether the side surface state of a terminal belongs to the A state, B state, C state, or D state mentioned above, and the estimated side surface state Based on the above, the gap distance d (see FIG. 10) between the tip portions 11a and 11b is calculated using the respective gap calculation programs. Specifically, the gap distance d is calculated by changing the color extraction conditions for detecting the edges of the tips 11a and 11b for each side state.

[Description of color extraction conditions]
Next, color extraction conditions in the A state, the B state, the C state, and the D state will be described with reference to FIGS. FIG. 3 is an explanatory diagram showing the relationship between the distribution of hues included in an image photographed by the camera 14 and the hue circle, and FIG. 4 is an explanatory diagram showing an area for obtaining reflected light.

  FIG. 3A shows the hue distribution included in the image taken by the camera 14 when the tip portions 11a and 11b of the terminal 11 are in the A state, and the curve p1 indicates the light in the region q2 shown in FIG. The terminal reflected light distribution as the distribution is shown, and the curve p2 shows the gap reflected light distribution as the light distribution in the region q1 shown in FIG. Also, the horizontal axis shows the hue circle, and changes from left to right in the order of “green” “yellow” “red” “purple” “blue” “light blue” “green”. And the right end of the ring. In FIG. 3A, the curve p1 has a peak in a region where the hue is “red”, and the curve p2 has a peak in a region where the hue is “blue”. Therefore, the edge portion e of the distal end portion 11a (the boundary between the distal end portion 11a and the region q1 serving as the gap portion) has a hue indicated by reference sign e1 in FIG.

  FIG. 3B shows the hue distribution included in the image photographed by the camera 14 when the tip portions 11a and 11b of the terminal 11 are in the B state, and the curve p3 is a terminal that is the light distribution in the region q2. The reflected light distribution is shown, and the curve p4 shows the gap reflected light distribution that is the light distribution in the region q1. As described above, in the B state, the light reflected by the tip portions 11a and 11b tends to be dark. Therefore, the curve p3 has a peak in a region where the hue is slightly shifted from “red” to “blue”. Yes. The curve p4 has a peak in a region where the hue is slightly shifted from “blue” to “red”. In this case, the edge portion e of the distal end portion 11a has a hue indicated by a symbol e2 in FIG.

  FIG. 3C shows the hue distribution included in the image taken by the camera 14 when the tip portions 11a and 11b of the terminal 11 are in the C state, and the curve p5 is a terminal that is the light distribution in the region q2. The reflected light distribution is shown, and the curve p6 shows the gap reflected light distribution which is the light distribution in the region q1. As described above, in the C state, the light reflected by the tip portions 11a and 11b tends to be red. Therefore, the curve p5 has a peak in a region where the hue is slightly shifted from “red” to the “yellow” side. ing. The curve p6 has a peak in a region where the hue is shifted from “blue” to “red”. In this case, the edge portion e of the distal end portion 11a has a hue indicated by a symbol e3 in FIG.

  FIG. 3D shows the hue distribution included in the image photographed by the camera 14 when the tip portions 11a and 11b of the terminal 11 are in the D state, and the curve p7 is a terminal that is the light distribution in the region q2. The reflected light distribution is shown, and the curve p8 shows the gap reflected light distribution that is the light distribution in the region q1. As described above, in the D state, the light reflected by the tip portions 11a and 11b tends to be blue. Therefore, the curve p7 has a peak in a region where the hue is slightly shifted from “red” to “blue”. Yes. The curve p8 has a peak in a region where the hue is shifted from “blue” to “green”. In this case, the edge portion e of the distal end portion 11a has a hue indicated by a symbol e4 in FIG.

  And the edge of the front-end | tip part 11a can be recognized on the basis of the hue shown to above-mentioned e1-e4 for every terminal state. That is, in the present embodiment, edge detection corresponding to the terminal state is performed by changing the color extraction condition of the terminal 11 for each state based on the characteristics of the above four states. Then, a gap measurement process based on the detected edge is executed.

[Description of Operation of First Embodiment]
Next, the processing operation of the terminal inspection apparatus according to the first embodiment of the present invention will be described with reference to the flowcharts shown in FIGS.

  When the gap inspection of the terminal 11 is started, the light irradiation unit shown in FIG. 1 irradiates the blue light from the blue light emitting unit 12 toward the terminal 11 and the terminals from the two red light emitting units 13a and 13b. 11 is irradiated with red light.

  The camera 14 captures the light reflected by the terminal 11 and outputs the captured image data to the image analysis unit 23. This image is displayed on the display 31. Further, the image analysis unit 23 detects the hue included in the image, and the gap calculation unit 25 further detects the edges of the two end portions 11a and 11b of the terminal 11 from the relationship between the detected hue and the reference hue. Is detected. In this process, since the edge e1 shown in FIG. 3A is set, the gap calculation unit 25 detects the edge of each of the tip portions 11a and 11b using this edge e1, and sets the gap distance d. Obtained (step S11 in FIG. 5).

  Then, it is determined whether or not the obtained gap distance d is within a preset good product range (step S12), and if it is determined that it is within the good product range (YES in step S12). The pass / fail judgment unit 26 judges that the terminal 11 is a non-defective product. The determination result is displayed on the display 31.

  On the other hand, if it is determined that the gap distance d obtained in step S11 is not within the non-defective range (NO in step S12), terminal selection processing is executed in step S14.

  Hereinafter, a detailed processing procedure of the terminal selection processing will be described with reference to a flowchart shown in FIG. First, the image analysis unit 23 inspects the hue of the image in the gap region (region R1 shown in FIG. 7) between the tip portions 11a and 11b of the terminal 11 (step S31).

  Next, the image analysis unit 23 evaluates the “blue” component of the hue included in the gap region R1, and determines whether the hue of “blue” is greater than the threshold (step S32). If it is determined that the hue of “blue” is equal to or greater than the threshold value (Hi in step S32), the terminal selection unit 24 determines that the side surface of the terminal 11 is in the D state (step S34). Therefore, the tip portions 11a and 11b of the terminal 11 are detected using the hue of the edge e4 shown in FIG.

  On the other hand, when it is determined in the process of step S32 that the hue of “blue” is less than the threshold (Low in step S32), the image analysis unit 23 performs the “red” component of the hue included in the gap region R1. Is evaluated and it is determined whether or not the hue of “red” is greater than the threshold (step S33). If it is determined that the hue of “red” is equal to or greater than the threshold (Hi in Step S33), the terminal selection unit 24 determines that the side surface of the terminal 11 is in the C state (Step S35). Therefore, the tip portions 11a and 11b of the terminal 11 are detected using the hue of the edge e3 shown in FIG.

  If it is determined in step S33 that the hue of “red” is less than the threshold (Low in step S33), the terminal selection unit 24 determines that the side surface of the terminal 11 is in the B state. (Step S36). Therefore, the tip portions 11a and 11b of the terminal 11 are detected using the hue of the edge e2 shown in FIG.

  And based on each state determined by the process of step S34, S35, S36, either one of the edges e2-e4 is selected, and the gap | interval calculating part 25 uses the selected edge, and between front-end | tip parts 11a and 11b Is obtained (step S15 in FIG. 5). Thereafter, it is determined whether or not the obtained gap distance d is within a non-defective range (step S16). If it is within this range, it is determined that the terminal 11 is non-defective (step S13). Otherwise, it is determined that the terminal 11 is a defective product (step S17).

  Thus, the gap can be measured with high accuracy by inspecting the gap based on the condition according to the state of the side surface of the terminal.

  As described above, in the terminal inspection apparatus according to the first embodiment, when the gap distance d between the terminals 11 is measured using the reference threshold value, and it is determined that the product is not a good product, it is regarded as a defective product. Instead, according to the state of the side surface of the terminal 11, the condition for calculating the gap distance d is set and the gap distance d is calculated again. Therefore, it is possible to reduce the probability of erroneously determining a non-defective product as a defective product, and to inspect the state of the tip portion of the terminal 11 with higher accuracy.

  In addition, since a non-defective product or a defective product can be determined regardless of the processing conditions of the press punching machine, frequent setting adjustments by the operator are unnecessary. Furthermore, line stoppage due to erroneous determination of an image can be reduced, and operating efficiency can be improved.

[Description of Second Embodiment]
Next, a second embodiment of the terminal inspection apparatus according to this embodiment will be described. The apparatus configuration is the same as that in FIG. 1 described above, and only the processing procedure of step S14 in the flowchart shown in FIG. 5 is different in the second embodiment. Hereinafter, the processing procedure of the terminal inspection apparatus according to the second embodiment will be described with reference to the flowchart shown in FIG.

  First, the image analysis unit 23 classifies the gap regions of the tip portions 11a and 11b of the terminal 11 in the vertical direction (upper gap region R2a and lower gap region R2b shown in FIG. 9), and the hue of the image in each gap region. Is inspected (step S51).

  Next, the image analysis unit 23 detects the “blue” component and the “red” component included in the upper gap region R2a and the lower gap region R2b. Here, the hue of “blue” is defined in 256 levels from 0 to 255, and similarly, the hue of “red” is defined in 256 levels from 0 to 255.

  Then, in the process of step S52, component evaluation of each hue is performed, and a selection area is selected based on the evaluation result (step S54). Specifically, when the blue component amount included in the upper gap region R2a exceeds “220”, the upper gap region R2a is selected as the selection area. Further, when the blue component amount included in the upper gap region R2a is “220” or less and the blue component amount included in the lower gap region R2b exceeds “220”, the lower gap region R2b is selected. Select as area.

  Furthermore, when the blue component amount is “220” or less in both the upper and lower portions and the red component amount included in the upper gap region R2a exceeds “80”, the upper gap region R2a is selected as the selection area. When the red component amount contained in the upper gap region R2a is “80” or less and the red component amount contained in the lower gap region R2b exceeds “80”, the lower gap region R2b is selected. Select as area.

  In cases other than the above, the amount of blue component contained in the upper gap region R2a is compared with the amount of blue component contained in the lower gap region R2b (step S53). It selects as a selection area (step S54). Thereafter, using the image of the selected sorting area, it is determined whether the side surface state of the terminal 11 is the B state, the C state, or the D state by the processes in steps S55 to S61 described below.

  First, in step S55, a first selection process is executed. In this process, it is determined whether or not the blue component amount in the image (hereinafter simply referred to as “image”) of the selected region (R2a or R2b) exceeds “210”. If it exceeds “210”, it is determined that the side surface of the terminal 11 is in the D state (step S62). That is, when the degree of blue color in the image is large, it is determined that the terminal 11 is in the D state because there is a high possibility that the terminal 11 has a gap as shown in FIG.

  In step S56, the second sorting process is executed. In this process, it is determined whether or not the red component amount in the image exceeds “95”. If it exceeds “95”, it is determined that the side surface of the terminal 11 is in the C state (step S63). That is, when the degree of red in the image is large, as shown in FIGS. 14B and 2C, it is highly likely that the area of the fractured surface is large, so it is determined that the state is the C state. .

  In step S57, a third sorting process is executed. In this process, it is determined whether or not the blue component amount in the image exceeds “160”. That is, it is determined whether or not the amount of blue component exceeds “160” under the condition that the red component is “95” or less. If “160” is exceeded, it is determined that the side surface of the terminal 11 is in the D state (step S62).

  In step S58, the fourth sorting process is executed. In this process, it is determined whether or not the red component amount in the image exceeds “60”. That is, it is determined whether or not the red component amount exceeds “60” under the condition that the blue component is “160” or less. If it exceeds “60”, it is determined that the side surface of the terminal 11 is in the B state (step S64). That is, when the red component in the image is present to some extent and the blue component amount is low, it can be determined that the entire image is dark, so as shown in FIGS. 14 (a) and 2 (b), Since there is a high possibility that the area of the shear plane is large, it is determined that the state is the B state.

  In step S59, the fifth sorting process is executed. In this process, it is determined whether or not the blue component amount in the image exceeds “140”. That is, it is determined whether or not the blue component amount exceeds “140” under the condition that the red component is “60” or less. If it exceeds “140”, it is determined that the side surface of the terminal 11 is in the D state (step S62).

  In step S60, a sixth sorting process is executed. In this process, it is determined whether or not the blue component amount in the image exceeds “80”. If it exceeds “80”, it is determined that the side surface of the terminal 11 is in the B state (step S64).

  In step S61, a seventh sorting process is executed. In this process, it is determined whether or not the red component amount in the image exceeds “40”. That is, it is determined whether the red component amount exceeds “40” under the condition that the blue component is “80” or less. If it exceeds “40”, it is determined that the side surface of the terminal 11 is in the C state (step S63). On the other hand, if it is “40” or less, it is determined that the side surface of the terminal 11 is in the B state (step S64).

  Thus, by discriminating over a plurality of stages based on the blue component amount and the red component amount contained in the image of the selected region (R1a or R1b), the B state, the C state, Alternatively, the D state can be classified. The subsequent processing is the same as the processing in steps S15 to S17 shown in FIG.

  As described above, in the terminal inspection apparatus according to the second embodiment, when the gap distance d of the terminal 11 is measured using the reference threshold value, and it is determined that the terminal 11 is not a good product, it is regarded as a defective product. Instead, the condition for calculating the gap is set according to the state of the side surface of the terminal 11 and the gap distance d is calculated again. Therefore, the probability of misjudging a non-defective product as a defective product is reduced, and the accuracy is increased. The state of the tip of the terminal 11 can be inspected.

  In addition, since a non-defective product or a defective product can be determined regardless of the processing conditions of the press punching machine, frequent setting adjustments by the operator are unnecessary. Furthermore, line stoppage due to erroneous determination of an image can be reduced, and operating efficiency can be improved.

  The terminal inspection apparatus and the terminal inspection method of the present invention have been described above based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit is an arbitrary configuration having the same function. Can be replaced with something.

  For example, in the above-described embodiment, an example in which blue light is used as the first color light and red light is used as the second color light has been described. However, the present invention is not limited to this, and the color contrast is not limited thereto. Any other color light can be used as long as the color can be identified using.

  In the above-described embodiment, the example in which the side surface state of the terminal 11 is classified into four states of the A state, the B state, the C state, and the D state has been described. It is possible to classify into the above, and it is also possible to classify into two or three states.

  The present invention can be used to measure the gap distance with high accuracy regardless of the side surface state of the terminal.

11 Bifurcated terminal (terminal)
11a, 11b Tip part 12 Blue light emitting part 13a, 13b Red light emitting part 14 Camera 21 Controller 22 Light irradiation part 23 Image analysis part 24 Terminal selection part 25 Gap calculation part 26 Pass / fail judgment part 27 Power supply part 31 Display R1 Gap area R2a Upper gap area R2b Lower gap area

Claims (5)

In the terminal inspection device that inspects the gap between the bifurcated terminals,
A first irradiating means for irradiating first colored light toward the bifurcated terminal from an axial direction parallel to the longitudinal direction of the bifurcated terminal;
Second irradiating means for irradiating the second colored light from the direction inclined at a predetermined angle with respect to the axial direction toward the bifurcated terminal;
Photographing means for photographing the first color light irradiated on the bifurcated terminal and the reflected light of the second color light;
A gap calculation means for extracting the first color light and the second color light from the image shot by the shooting means, and obtaining a gap distance between the bifurcated terminals based on the extraction result;
With
The gap calculation means includes
According to the side surface state of the bifurcated terminal, a hue that serves as a threshold for determining the edge portion of the tip of the bifurcated terminal is set, and based on this hue, the edge of the tip is detected, A storage unit for storing a plurality of gap calculation programs for obtaining the distance between the edges of the tip part ,
Based on the extraction results of the first color light and the second color light, the side surface state is determined, and the clearance distance between the bifurcated terminals is determined using the clearance calculation program corresponding to the determined side surface state. A terminal inspection device characterized by obtaining The gap calculation means includes a color component of the first color light included in an image of a gap area between the tips of the bifurcated terminals of an image photographed by the photographing means, and a second The terminal inspection apparatus according to claim 1 , wherein the side surface state is classified according to a color component amount of color light . The gap calculation means divides the gap area into an upper area and a lower area by a center line in a direction parallel to a line connecting the two tip portions, and a color component of the upper area and a lower side Based on the color component of the component, select the upper area or the lower area as the selection area,
The terminal inspection apparatus according to claim 2 , wherein the side surface state is determined based on a color component of the selected sorting area . 4. The terminal inspection device according to claim 1, wherein the first color light is blue light, and the second color light is red light . 5. In the terminal inspection method for inspecting the gap between the forked terminals,
A first chromatic light irradiation step of irradiating the first chromatic light toward the bifurcated terminal from an axial direction parallel to the longitudinal direction of the bifurcated terminal;
A second color light irradiation step of irradiating second color light toward the bifurcated terminal from a direction inclined by a predetermined angle with respect to the axial direction;
A photographing step of photographing the first color light and the reflected light of the second color light applied to the bifurcated terminal with a photographing unit;
The first color light and the second color light are extracted from the image photographed by the photographing means, and a plurality of gap calculation programs corresponding to the side surface state of the bifurcated terminal are stored based on the extraction result. A gap calculation step of selecting an appropriate gap calculation program from the storage unit to obtain the gap distance of the bifurcated terminal using the gap calculation program;
With
According to the side surface state, the gap calculation program sets a hue that serves as a threshold value for determining the edge portion of the tip portion of the bifurcated terminal, and detects the edge of the tip portion based on the hue. A program that calculates the distance between the edges of two tips
Terminal inspection method characterized by this.

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