JP2017194410A - Inspection device and inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device capable of making a quality determination on a defect of a conic container with high precision.SOLUTION: The present invention relates to an inspection device 1 which has a first end part 801 on the side of an opening part 81 in a first direction D1 and a second end part 802 on the opposite direction from the opening part 81 in the first direction D1, and detects a defect of a conic container 8 in a conic shape increasing in opening area from the second end part 802 toward the first end part 801, the inspection device comprising: an imaging part 3 which images the conic container 8 from the side of the opening 81; and a calculation part 11 which calculates a detection position image value G as an index of size of an image of the defect F at a detection position based upon a first image reference value K1 as an index of size of the image of a reference defect when the reference detect is imaged by the imaging part 3 at the first end part 801, a second image reference value K2 as an index of size of the image of the reference defect when the reference detect is imaged by the imaging part 3 at the second end part 802, and a defect distance from the second end part 802 to the defect F.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inspection apparatus and an inspection method for inspecting a conical container.

  Conventionally, an inspection device for inspecting the inner surface of a conical container (conical container) is known (see, for example, Patent Document 1). The conical container is formed in a conical shape that is inclined so that the opening area increases toward the opening on one end side in a predetermined direction. The inspection apparatus described in Patent Document 1 inspects defects such as foreign matter and dirt on the inner surface of the container based on an image obtained by imaging the inner surface of the conical container from the opening side.

JP-A-11-271240

  When inspecting a defect in a conical container, the conical container is a three-dimensional object, and the distance from the camera (imaging unit) differs from one end to the other end on the opening side in a predetermined direction. . Therefore, even if the defect has the same size, there is a difference in the size of the defect image captured by the camera depending on the detection position. As a result, when determining the quality of the defect based on the size of the image captured by the camera, even if the defect has the same size, the determination of the quality of the defect differs depending on the detection position of the defect. It was.

  The subject of this invention is providing the inspection apparatus and inspection method which can perform the quality determination of the defect of a cone-shaped container with high precision.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another configuration.

The first invention is the first end (801) on the opening (81) side in the first direction (D1) and the second on the opposite side to the opening (81) in the first direction (D1). And detecting a defect in the conical container (8) having an end portion (802) and having an opening area that increases from the second end portion (802) toward the first end portion (801). An imaging device (3) for imaging the conical container (8) from the opening (81) side, and the imaging unit (3) at the first end (801) When the reference defect is imaged by the first image reference value (K1) that serves as an index of the size of the image of the reference defect, the reference defect is imaged by the imaging unit (3) at the second end (802). A second image reference value (K2) serving as an index of the size of the image of the reference defect in the case of And the defect (F) at the detection position based on the defect distance (a) from the second end (802) to the defect (F) in the second direction (D2) orthogonal to the first direction (D1). An inspection apparatus (1) comprising: a calculation unit (11) that calculates a detection position image value (G) serving as an index of an image size.
A second invention is the inspection device (1) according to the first invention, wherein the conical container (8) is a conical container.
According to a third aspect, in the second aspect, the detection position image value is G, the first image reference value is K1, the second image reference value is K2, and the radius of the opening (81) is set. In the case where r and the defect distance are a, the calculation unit (11) calculates the detected position image value G according to a calculation formula of G = K1− (a / r) × (K2−K1). This is an inspection apparatus (1) characterized by the above.
The fourth invention is the first end (801) on the opening (81) side in the first direction (D1) and the second end opposite to the opening (81) in the first direction (D1). And detecting a defect in the conical container (8) having an end portion (802) and having an opening area that increases from the second end portion (802) toward the first end portion (801). The conical container (8) includes a first end (801) on the opening (81) side in the first direction (D1) and a first direction (D1). An imaging step of imaging the conical container (8) from the opening (81) side, and a second end (802) opposite to the opening (81); Of the size of the image of the reference defect when the reference defect is imaged by the imaging process in the section (801) The first image reference value (K1), and the second image reference value (K2) that serves as an index of the image size of the reference defect when the reference defect is imaged by the imaging process at the second end portion (802). And the defect (F) at the detection position based on the defect distance (a) from the second end (802) to the defect (F) in the second direction (D2) orthogonal to the first direction (D1). And a calculation step of calculating a detection position image value (G) that serves as an index of the size of the image.

  ADVANTAGE OF THE INVENTION According to this invention, the inspection apparatus and inspection method which can perform the quality determination of the defect of a cone-shaped container with high precision can be provided.

It is a figure showing the whole defect inspection device 1 composition of an embodiment. It is a figure explaining the method of calculating the detection position image value G used as the parameter | index of the magnitude | size of the defect F of the conical container 8, Comprising: (a) is a side view of the conical container 8, (b) is a conical container 8 It is a figure at the time of seeing from the opening part 81 side.

(Embodiment)
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating an overall configuration of a defect inspection apparatus 1 according to an embodiment. FIG. 2 is a diagram for explaining a method for calculating a detection position image value G that is an index of the size of the defect F of the conical container 8, wherein (a) is a side view of the conical container 8, and (b). These are figures at the time of seeing the conical container 8 from the opening part 81 side.

  As shown in FIG. 1, the defect inspection apparatus 1 as an inspection apparatus of the present embodiment is an apparatus for inspecting defects on the inner surface of the conical container 8. As shown in FIG. 1, an opening 81 is formed at one end of the conical container 8, and a top 83 is formed at the other end of the conical container 8. The conical container 8 is formed in a conical shape having an opening area that increases from the top 83 toward the opening 81.

  As shown in FIGS. 2A and 2B, the conical container 8 has a first end 801 and a second end 802. The first end 801 is an end on the opening 81 side in the conical axis direction D1 (first direction) of the conical container 8. The second end 802 is an end on the opposite side of the opening 81 in the conical axis direction D1 (first direction) of the conical container 8. In the conical container 8, the opening 81 has a circular shape, and the opening area gradually increases as the body 82 moves from the first end 801 on the opening 81 side toward the second end 802 on the top 83 side. It is formed as follows.

  In this embodiment, the conical container 8 is a conical packaging container etc. which are arrange | positioned along the outer surface of the cone of an ice cream, for example. The conical container 8 is formed of, for example, paper or film. Examples of defects on the inner surface of the conical container 8 include a hole, a foreign object, dirt, and a flaw.

  As shown in FIG. 1, the defect inspection apparatus 1 includes a conveyance belt 2 that conveys a conical container 8, a camera 3 that serves as an imaging unit disposed above a predetermined position of the conveyance belt 2, and a first illumination unit 4. The 2nd illumination part 5, the container detection sensor 6, and the control part 10 are provided.

  As shown in FIG. 1, the transport belt 2 transports the conical container 8 in the transport direction P. A container regulating member 21 is fixed to the upper surface of the conveyor belt 2. The container regulating member 21 is composed of a pair of bar-shaped bar members 21 a and 21 a, and is arranged in a substantially V shape with the apex portion spaced apart along the inclined side surface of the conical container 8. The conical container 8 is disposed between the pair of bar members 21 a and 21 a on the upper surface of the conveyor belt 2 and is conveyed along with the movement of the conveyor belt 2 in a state where the position in the conveyance direction P is regulated with respect to the conveyor belt 2. It is moved in the direction P.

  The camera 3 is disposed on the opening 81 side in the conical container 8 and images the conical container 8 from the opening 81 side. The direction in which the camera 3 images the conical container 8 coincides with the conical axis direction D1. The camera 3 is an area camera that arranges CCD elements and the like in the vertical and horizontal directions and captures an image two-dimensionally. The camera 3 images all areas on the inner surface of the conical container 8 from the opening 81 side of the conical container 8.

  The first illumination unit 4 is disposed on the opening 81 side (first end 801 side) of the conical container 8 imaged by the camera 3, and irradiates the inner surface of the conical container 8 from the opening 81 side of the conical container 8. Ring lighting.

  The 2nd illumination part 5 is arrange | positioned at the top part 83 side (2nd end part 802 side) of the conical container 8 imaged with the camera 3, and irradiates the conical container 8 from the top part 83 side (2nd end part 802 side). Surface lighting. In the present embodiment, the top 83 of the conical container 8 is provided with a top hole 83a that is as small as a needle hole. By irradiating the conical container 8 with the second illumination unit 5, when the conical container 8 is imaged by the camera 3, by detecting the top hole 83 a of the top 83 of the conical container 8, the opening 81 of the conical container 8 is detected. A center 803 (see FIGS. 2A and 2B) can be detected.

  The container detection sensor 6 is disposed in front (upstream side) of the conveyance direction P of the conveyance belt 2 with respect to the imaging position A by the camera 3. The container detection sensor 6 is connected to the control unit 10 and outputs a detection signal to the control unit 10 when the tip of the conical container 8 arrives.

  The control unit 10 controls the camera 3, the first illumination unit 4, and the second illumination unit 5. When receiving the detection signal from the container detection sensor 6, the control unit 10 operates the camera 3 in accordance with the time for which the conical container 8 passes through the imaging position A. At the same time, the control unit 10 controls the first illumination unit 4 and the second illumination unit 5 to irradiate the conical container 8.

The control unit 10 includes a calculation unit 11. Based on the first image reference value K1, the second image reference value K2, and the defect distance a, the calculation unit 11 uses the following calculation formula (1) to detect as an index of the image size of the defect F at the detection position. A position image value G is calculated. The radius of the opening 81 of the conical container 8 is r.
G = K1- (a / r) × (K2-K1) (1)

The first image reference value K1 is a reference value that serves as an index of the size of the reference defect image when the reference defect is imaged by the camera 3 at the first end 801 of the conical container 8.
The second image reference value K2 is a reference value that serves as an index of the size of the reference defect image when the reference defect is imaged by the camera 3 at the second end 802 of the conical container 8.
The first image reference value K1 and the second image reference value K2 vary depending on conditions such as the distance between the camera 3 and the conical container 8, and are stored in advance in a storage unit (not shown) based on experimental data or the like. .

  In the present embodiment, the first image reference value K1 and the second image reference value K2 are resolution values in an image captured by the camera 3, for example. The resolution value means the minimum unit in the image captured by the camera 3 and is the length of one side of one square pixel when captured by the camera 3.

  As shown in FIG. 2, the resolution value of the first image reference value K1 is the length of one side of one pixel at the first end 801 on the opening 81 side of the conical container 8. The first end 801 is located at a position closest to the camera 3 in the conical container 8. In the present embodiment, for example, in the opening 81 of the first end 801 of the conical container 8, the resolution value is 0.05 mm.

  As shown in FIG. 2, the resolution value of the second image reference value K2 is the length of one side of one pixel at the second end 802 on the top 83 side of the conical container 8. The second end 802 is located at a position farthest from the camera 3 in the conical container 8. In the present embodiment, for example, at the top 83 of the second end 802 of the conical container 8, the resolution value is 0.1 mm.

  In the present embodiment, in the conical container 8, the resolution value (first image reference value K1) of the position (first end portion 801) that is the closest to the camera 3 and the position that is the farthest from the camera 3 (first image). The resolution value difference (K2−K1) is calculated based on the resolution value (second image reference value K2) of the two end portions 802), and the cone is determined by the defect distance a of the defect F captured by the camera 3. The resolution value of the defect F existing between the first end 801 and the second end 802 in the conical axis direction D1 of the container 8 is calculated.

  The defect distance a is a distance from the center 803 (second end 802) of the opening 81 to the defect F in the radial direction D2 (second direction) of the opening 81 (when viewed from the opening 81 side). The radial direction D2 of the opening 81 is orthogonal to the conical axis direction D1 of the conical container 8. In the present embodiment, the defect distance a is calculated from the distance from the top hole 83a (the center 803 of the opening 81) of the conical container 8 irradiated to the second illumination unit 5 and imaged by the camera 3 to the defect F. The The top hole 83a may not be provided in the conical container 8, and the defect distance a depends on the distance from the center position (center 803) of the diameter of the opening 81 of the conical container 8 imaged by the camera 3, for example. It may be calculated.

  The calculation unit 11 uses the defect distance a to calculate the ratio (a / r) between the radius r of the opening 81 of the conical container 8 and the defect distance a from the center 803 of the opening 81 of the conical container 8 to the defect F. Is calculated, and the ratio of the difference (K2−K1) between the second image reference value K2 and the first image reference value K1 is calculated, whereby the first image reference value K1 or the second image at the detection position of the defect F is calculated. A relative image value from the image reference value K2 can be calculated.

  As described above, the calculation unit 11 calculates the radius r of the opening 81 of the conical container 8 and the defect distance a from the center 803 of the opening 81 of the conical container 8 to the defect F according to the above calculation formula (1). Of the detected position image by subtracting the ratio of the difference (K2−K1) between the second image reference value K2 and the first image reference value K1 from the first image reference value K1. The value G is calculated.

Next, operation | movement of the defect inspection apparatus 1 of embodiment is demonstrated.
First, when the conical container 8 placed on the transport belt 2 is transported in the transport direction P, the control unit 10 detects the transported conical container 8 at the imaging position A and the first illumination unit 4 and the second illumination. Control is performed so that the cone container 8 is irradiated by the unit 5 and an image is taken by the camera 3 from the opening 81 side of the cone container 8.

  Thereby, the camera 3 images the inner surface of the conical container 8 from the opening 81 side of the conical container 8, images the top hole 83 a of the top 83 of the conical container 8, and a defect F on the inner surface of the conical container 8. In some cases, the defect F is imaged (imaging process).

  Based on the first image reference value K1, the second image reference value K2, and the defect distance a, the calculation unit 11 of the control unit 10 calculates a detection position image value G that serves as an index of the image size of the defect F at the detection position. calculate. The calculation unit 11 calculates the detection position image value G of the defect F by the above-described calculation formula (1) [G = K1− (a / r) × (K2−K1)] (calculation step).

In the present embodiment, as shown in FIG. 2A, for example, the resolution value of the first image reference value K1 is 0.05 mm, and the resolution value as the second image reference value K2 is 0.1 mm. . Further, for example, when the defect F is on the central side surface in the conical axis direction D1 of the conical container 8, the defect distance a is r / 2.
Therefore, K1 = 0.05 mm, K2 = 0.1 mm, and a = r / 2 are substituted into the above formula (1) [G = K1− (a / r) × (K2−K1)].
Accordingly, the detection position image value G = 0.1 mm− (r / 2) / r × (0.1 mm−0.05 mm) = 0.075 mm can be calculated.

  When the pixel (area value) at the detection position is multiplied based on the detection position image value G, the following detection position correction calculation value is obtained. Here, for comparison, calculated values after correction of pixels at the position of the opening 81 of the first end 801, the position of the detection position 804, and the position of the top 83 of the second end 802 are obtained. Before the correction calculation, the number of pixels captured by the camera 3 of the defect F at each position is 400 pixels (20 × 20) at the first end 801 and 177 pixels (20 × 20) at the detection position 804. 13.3 × 13.3), and the second end 802 has 100 pixels (10 × 10).

At the position of the opening 81 of the first end 801, the first end calculation value is 400 pixels × [0.05 (resolution value) × 0.05 (resolution value)] (resolution value) after correction. According to the calculation formula, 1.0 mm ² is obtained.
At the detection position 804, the detection position correction calculation value after correction is 1.0 mm ^{2 according} to the calculation formula of 177 pixels × [0.075 (resolution value) × 0.075 (resolution value)].
At the position of the top portion 83 of the second end portion 802, the second end portion calculated value is 1 by the calculation formula of 100 pixels × [0.1 (resolution value) × 0.1 (resolution value)] after correction. the .0mm ^2.
That is, by correcting in this way, when the size of the defect F of the conical container 8 is the same, the size of the defect F becomes the same calculation value regardless of the position of the defect F of the conical container 8.

After calculating the detection position image value G by the calculation unit 11, the control unit 10 calculates the detection position correction calculation value based on the detection position image value G as described above, and the detection position correction calculation value is determined as a determination threshold (for example, 1.0 mm ² ) or more. When it is equal to or greater than the determination threshold, the control unit 10 determines that the defect of the conical container 8 is defective. When it is determined that the conical container is a non-defective product, the conical container 8 is sorted by an air reject device (not shown) that ejects air from the air ejection nozzle on the downstream side of the transport belt 2. Collected as good products outside. On the other hand, when it is determined that the conical container is defective, the conical container 8 transported to the transport belt 2 is collected as a defective product on the downstream side of the transport belt 2 without air being ejected by the air reject device. Is done.

  Conventionally, for example, a square defect with a side of 1 mm has the same distance from the camera 3 at the opening 81 of the first end 801 and the top 83 of the second end 802 in the conical container 8. Even for a 1 mm square defect, the number of pixels of the image captured by the camera 3 is 400 pixels (20 × 20) at the first end 801 and 100 pixels (10 × 10 6) at the second end 802. ).

  Conventionally, in such a case, when the threshold value for defective defects of the conical container 8 is set to 100 pixels, a square defect having a side of 1 mm at the second end 802 is imaged by the camera 3. The image has 100 pixels (10 × 10), and is determined to be defective. On the other hand, a square defect having a side of 0.5 mm at the first end 801 is also determined to be defective because the image captured by the camera 3 has 100 pixels (10 × 10). Therefore, conventionally, in the conical container 8, a square defect having a side of 0.5 mm that is determined to be a non-defective product has been determined to be defective.

  On the other hand, in this embodiment, as described above, when the size of the defect F of the conical container 8 is the same, the size of the defect F is the same regardless of the position of the defect F of the conical container 8. Calculated value. Thereby, the magnitude | size of the defect F can be determined irrespective of the position of the defect F of the conical container 8. FIG. Therefore, the quality of the defect F of the conical container 8 can be determined with high accuracy using the same threshold value.

As described above, the invention of the embodiment has the following effects.
(1) The calculation unit 11 of the defect inspection apparatus 1 detects a detection position that serves as an index of the image size of the defect F at the detection position based on the first image reference value K1, the second image reference value K2, and the defect distance a. An image value G is calculated.
Therefore, when the size of the defect F in the conical container 8 is the same, the size of the image of the defect F is corrected using the detection position image value G calculated by the calculation unit 11, thereby Regardless of the position of the defect F, the defect F has the same number of pixels. Thereby, regardless of the position of the defect F of the conical container 8, the quality determination of the defect F can be performed with high accuracy.

(2) The conical container 8 is formed in a conical shape. As a result, the opening 81 is circular and the body 82 is inclined at a constant inclination angle, and the apex 83 can accurately measure the defect distance a in the radial direction D2 (second direction) of the opening 81. The image of the defect F of the conical container 8 can be corrected with high accuracy.

(3) When the detection position image value is G, the first image reference value is K1, the second image reference value is K2, the radius of the opening 81 of the conical container 8 is r, and the defect distance is a The calculation unit 11 calculates the detected position image value G according to the calculation formula (1) of G = K1− (a / r) × (K2−K1). Therefore, the detection position image value G can be accurately calculated by the calculation unit 11 and the image of the defect F of the conical container 8 can be corrected with high accuracy.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as in the modifications described later, and these are also included in the present invention. Within the technical scope. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. It should be noted that the above-described embodiment and modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(Deformation)
(1) Although the conical container 8 has been described as an example of the conical container in the above-described embodiment, the present invention is not limited to this. Examples of the cone-shaped container include a pyramid container having a rectangular opening, a truncated cone container obtained by cutting a conical container along a plane parallel to the opening to remove a small cone, and a pyramid container at the opening. It may be a truncated pyramid container obtained by cutting along a parallel plane and removing a small pyramid portion. For example, the conical container may be a conical cup whose opening area increases toward the opening.

(2) In the above-described embodiment, the defect inspection apparatus 1 images and inspects the defect F on the inner surface of the conical container 8, but is not limited thereto. When the conical container is, for example, a permeable film, the defect inspection apparatus may inspect and inspect defects on the outer surface of the conical container.

1 Defect inspection equipment (inspection equipment)
3 Camera (imaging part)
8 Conical container (conical container)
81 Opening part 11 Calculation part 801 1st edge part 802 2nd edge part 803 Center (2nd edge part)
D1 Conical axis direction (first direction)
D2 radial direction (second direction)
F Defect G Detection position image value K1 First image reference value K2 Second image reference value a Defect distance

Claims (4)

A first end on the opening side in the first direction, and a second end on the opposite side of the opening in the first direction, from the second end toward the first end. An inspection apparatus for detecting defects in a conical container whose opening area increases according to
An imaging unit for imaging the conical container from the opening side;
The first image reference value that is an index of the size of the image of the reference defect when the reference defect is imaged by the imaging unit at the first end, and the reference defect is imaged by the imaging unit at the second end. Based on the second image reference value, which is an index of the size of the image of the reference defect, and the defect distance from the second end portion to the defect in the second direction orthogonal to the first direction. A calculation unit that calculates a detection position image value that serves as an index of the size of the image of the defect,
Inspection device characterized by The inspection apparatus according to claim 1,
The conical container is a conical container;
Inspection device characterized by The inspection apparatus according to claim 2,
The calculation is performed when the detected position image value is G, the first image reference value is K1, the second image reference value is K2, the radius of the opening is r, and the defect distance is a. The unit calculates the detected position image value G by a calculation formula of G = K1- (a / r) × (K2-K1).
Inspection device characterized by A first end on the opening side in the first direction, and a second end on the opposite side of the opening in the first direction, from the second end toward the first end. An inspection method for detecting defects in a conical container having an opening area that increases in accordance with
An imaging step of imaging the conical container from the opening side;
The first image reference value that is an index of the size of the image of the reference defect when the reference defect is imaged by the imaging process at the first end, and the reference defect is imaged by the imaging process at the second end. Based on the second image reference value, which is an index of the size of the image of the reference defect, and the defect distance from the second end portion to the defect in the second direction orthogonal to the first direction. A calculation step of calculating a detection position image value that is an index of the size of the image of the defect,
Inspection method characterized by

Images