JP2021051032A - Appearance inspecting apparatus of annular product - Google Patents

Abstract

To provide an appearance inspecting apparatus capable of inspecting appearance of an annular resin product with high accuracy.SOLUTION: An appearance inspecting apparatus includes a conveyance device for horizontally rotating a disk-like glass sheet 11 and conveying an inspection object K supplied onto the glass plate 11 in a rotation direction, a surface imaging device 20 for imaging the surface of the inspection object K conveyed by the conveyance device, and a determination device for processing an image imaged by the surface imaging device 20 and determining the quality of the appearance of the inspection object K. The surface imaging device 20 includes a surface imaging camera 21 arranged above at a surface imaging position P1, a surface side blue illumination part 22 that is arranged between the surface imaging camera 21 and the glass sheet 11 and irradiates the surface of the inspection object K with blue light, a surface side red illumination part 25 that is arranged between the surface side blue illumination part 22 and the glass sheet 11 and irradiates the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object K, and a green irradiation part 26 for surface inspection that is arranged below the glass sheet 11 and emits green light upward.SELECTED DRAWING: Figure 2

Description

The present invention relates to an appearance inspection device that images the appearance of an article using an imaging camera and processes the obtained image to determine the quality of the appearance of the article.

As the above-mentioned visual inspection apparatus, conventionally, the visual inspection apparatus disclosed in Japanese Patent Application Laid-Open No. 2007-64801 (Patent Document 1 below) is known. This visual inspection device inspects the appearance of an electronic component, and displays a transport mechanism that transports the electronic component in a predetermined transport direction and the surface of the electronic component that is transported by the transport mechanism and passes through a predetermined imaging region. The quality of the appearance of the electronic component is determined based on the image pickup mechanism for imaging, the lighting device for illuminating the electronic component transported in the imaging region by the transfer mechanism, and the image of the electronic component captured by the image pickup mechanism. It is provided with a determination processing unit for controlling the operation and a control unit for controlling the operation of the lighting device and the imaging mechanism.

The lighting device has a plurality of light projecting units that irradiate light toward the electronic component, includes a plurality of light projecting means in which the light projecting units are arranged in an annular shape, and each light projecting means is arranged coaxially. At the same time, they are arranged side by side in the axial direction, and at least one of the light projecting means is configured to irradiate the electronic component with light having a color different from that of the other light projecting means.

More specifically, each of the light projecting means includes a first light projecting means, a second light projecting means, and a third light projecting means arranged side by side in the axial direction, and the first light projecting means has its axis. The irradiation light axis of the light projecting unit is arranged so as to be tilted by 15 ° to 35 °, and the second light projecting means is configured to irradiate blue light toward the electronic component. The irradiation light axis of the light projecting unit is arranged so as to be tilted by 40 ° to 50 ° with respect to the axis line, and is configured to irradiate the electronic component with red light. Is arranged so that the irradiation light axis of the light projecting portion is tilted by 55 ° to 75 ° with respect to the axis line, and is configured to irradiate the electronic component with red light.

Further, the imaging mechanism is arranged so that its imaging optical axis is located within the arrangement ring of the light projecting unit of each of the light projecting means, and the control unit controls each of the light projecting means to control the respective light projecting means. Among the light projecting means, a light projecting means that irradiates light of the same color toward the electronic component and irradiates light while the electronic component passes through the imaging region. It is configured to switch to change the color of the light emitted to the electronic component, and controls the imaging mechanism to image the surface of the electronic component for each color of the light emitted to the electronic component. The determination processing unit is configured to perform a pass / fail determination based on each image captured for each color of light applied to the electronic component.

According to this visual inspection device, blue light is irradiated by tilting the irradiation light axis of the light projecting unit by 15 ° to 35 ° (55 ° to 75 ° with respect to the surface of the electronic component) from the central axis of the light projecting means. By doing so, it is possible to more effectively highlight defective portions existing on the surface of electronic components such as cracks and scratches. In addition, the irradiation light axis of the light projecting unit is irradiated with red light at an angle of 40 ° to 50 ° (40 ° to 50 ° with respect to the surface of the electronic component) from the central axis of the light projecting means, and 55 ° to 55 °. By irradiating at an angle of 75 ° (15 ° to 35 ° with respect to the surface of the laminated capacitor), defective parts existing inside the electronic component, such as the raised dielectric and internal electrodes of the laminated capacitor, are more effective. Can be made to stand out.

Thus, in this visual inspection device, by performing the above-mentioned illumination, it is possible to obtain an image in which the defects existing in the electronic components are more emphasized, and based on the image in which each defect is emphasized in this way. By determining the quality of the electronic component, it is possible to perform a more accurate visual inspection according to the characteristics of the electronic component.

Japanese Unexamined Patent Publication No. 2007-64801

By the way, in recent years, high quality performance has been required for all parts, and in particular, annular resin molded products such as O-rings and packings have high appearance properties (unevenness and scratches). Quality performance is required.

Therefore, it is conceivable to apply the visual inspection using the above-mentioned conventional visual inspection device to such a resin product.

However, the above-mentioned conventional visual inspection device has been developed to be compatible with electronic components, more specifically, multilayer capacitors, and although this multilayer capacitor can detect appearance defects with high accuracy. As for the resin molded products such as the O-ring and the packing described above, the appearance defects could not be sufficiently detected to the extent that they were satisfied. That is, most of the resin molded products such as the above-mentioned O-rings and packings have a dark color or black color, and it is therefore necessary to detect irregularities and scratches existing on the surface by using an optical method. Special technological development is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an appearance inspection apparatus capable of inspecting the appearance of a cyclic resin molded product having a dark color or black color with high accuracy. And.

The present invention for solving the above problems
An visual inspection device that inspects the appearance of an annular resin product as an inspection object.
A transport device provided with a transparent disk-shaped glass plate arranged horizontally, the glass plate is rotated horizontally, and the inspection object supplied on the glass plate is conveyed in the rotation direction of the glass plate. When,
A surface imaging device that images the surface of the inspection object transported by the transport device, and
A determination device for processing an image captured by the surface imaging device to determine the quality of the appearance of the inspection object is provided.
The surface imaging device is arranged above the surface imaging position set on the transport path of the inspection object, and images a color image of the surface of the inspection object at the surface imaging position. With the camera
A surface-side blue illumination unit that is above the surface imaging position and is arranged between the surface imaging camera and the glass plate to irradiate the surface of an inspection object at the surface imaging position with blue light. When,
It has an annular light projecting unit that is arranged between the front surface side blue illumination unit and the glass plate and is arranged coaxially with the imaging light axis of the surface imaging camera, and is red from the light projecting unit. A surface-side red illumination unit that illuminates the outer peripheral surface and inner peripheral surface of the inspection object at the surface imaging position by irradiating light toward the center side.
The present invention relates to a visual inspection apparatus including a green illumination unit for surface inspection, which is arranged below the glass plate at the surface imaging position and irradiates green light upward.

According to the visual inspection device of this aspect (first aspect), the annular resin product to be inspected is appropriately supplied onto the glass plate of the transfer device, and is conveyed in the rotation direction by the horizontal rotation of the glass plate. .. Then, a color image of the surface of the inspection object is imaged by the surface imaging camera at the surface imaging position, and the quality of the appearance of the inspection object is determined by the determination device based on the captured color image.

At the surface imaging position, the surface of the inspection object is illuminated by the blue light emitted from the front surface side blue illumination unit, and the surface of the inspection object is illuminated by the red light emitted from the surface side red illumination unit. The outer peripheral surface and the inner peripheral surface on the side are illuminated. Further, a green light directed upward is emitted from a green illumination unit for surface inspection provided below the glass plate, and the inspection object is illuminated with this green light as a backlight.

The blue light emitted from the front surface side blue illumination unit is easily scattered, and therefore has the characteristic that the amount of reflected light from the inspection object is small, and the red light emitted from the front surface side red illumination unit is scattered. Therefore, it is difficult, and therefore, it has a characteristic that the amount of reflected light from the inspection object is large. On the other hand, it is difficult to obtain the reflected light amount on the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object, and conversely, the reflected light amount is easily obtained on the surfaces other than the outer peripheral surface and the inner peripheral surface of the inspection object.

According to the surface imaging apparatus according to the present invention, the outer peripheral surface and the inner peripheral surface of an inspection object whose amount of reflected light is difficult to be locally obtained is irradiated with red light having low scattering property, thereby irradiating the outer peripheral surface and the inner peripheral surface. An appropriate amount of reflected light capable of detecting recesses and scratches existing on the peripheral surface can be guided to the surface imaging camera. Further, by irradiating the surface other than the outer peripheral surface and the inner peripheral surface of the inspection object, which is easy to obtain the amount of reflected light, with blue light having high scattering property, the recesses and scratches existing on the surface can be detected appropriately. The amount of reflected light can be guided to the surface imaging camera. Further, by illuminating green light other than blue and red as a backlight, the outline of the inspection object can be projected. For example, an annular resin molded product tends to have burrs on the outer peripheral surface and the inner peripheral surface during molding, but the presence or absence of burrs can be detected by analyzing the contour shape projected by the backlight.

Thus, according to the visual inspection apparatus according to the present invention, when there are recesses or scratches on the surface including the outer peripheral surface and the inner peripheral surface of the annular resin product, the recesses and scratches are emphasized and the recesses and scratches are emphasized. When burrs are present on the outer peripheral surface or the inner peripheral surface, a color image in which the burrs are emphasized is captured by the surface imaging camera. Whether or not there is a burr can be determined with high accuracy. In particular, in the case of a dark-colored or black resin molded product, it is difficult to detect recesses and scratches by illumination with white light, but according to the visual inspection apparatus according to the present invention, such a dark-colored or black resin molded product is used. Even in the case of a product, the presence or absence of recesses and scratches can be detected with high accuracy.

In the first aspect, the surface-side blue illumination unit includes a first surface-side blue illumination unit arranged on the upper side and a second surface-side blue illumination unit arranged on the lower side.
The first surface-side blue illumination unit has an annular light projection unit arranged coaxially with the image pickup optical axis of the surface image pickup camera, and is blue toward the surface image pickup position below the light projection unit. Configured to irradiate light
The second surface-side blue illumination unit is a dome-shaped reflective member having an opening at the lower end and an opening at the upper end through which the light emitted from the light projecting portion of the first surface-side blue illumination unit passes. It has a reflective member whose inner surface is a diffuse reflection surface, and an annular light projecting portion which is arranged on the lower edge portion of the reflective member and irradiates blue light toward the inner surface of the reflective member. It is possible to adopt an embodiment configured to irradiate the light emitted from the light projecting unit and reflected by the diffuse reflection surface toward the surface imaging position.

As in this aspect (second aspect), by illuminating the cyclic resin product by the first surface side blue illuminating unit and the second surface side blue illuminating unit, the surface can be illuminated more uniformly, and the recesses and the recesses can be illuminated. If there are scratches, these can be emphasized more.

The visual inspection device according to the first or second aspect further includes a back surface imaging device that images the back surface of the inspection object transported by the transport device.
The back surface imaging device is arranged below the glass plate at the back surface imaging position set on the transport path of the inspection object, and captures a color image of the back surface of the inspection object at the back surface imaging position. Backside imaging camera and
A backside blue illumination unit that is below the backside imaging position and is disposed between the backside imaging camera and the glass plate to irradiate the back surface of an inspection object at the backside imaging position with blue light. When,
It has an annular light projecting unit that is arranged between the back surface side blue illumination unit and the glass plate and is arranged coaxially with the imaging light axis of the back surface imaging camera, and is red from the light projecting unit. A red illumination unit on the back surface side that illuminates the outer peripheral surface and the inner peripheral surface on the back surface side of the inspection object at the back surface imaging position by irradiating light toward the center side.
At the back surface imaging position, a green illumination unit for back surface inspection, which is arranged above the glass plate and irradiates green light downward, is provided.
The determination device can further take an aspect configured to process an image captured by the back surface imaging device to determine the quality of the appearance of the inspection object.

The back surface imaging device in this aspect (third aspect) has a configuration in which the front surface imaging device is turned upside down, and according to the visual inspection device provided with the back surface imaging device, the outer peripheral surface of the annular resin product is provided. When there are recesses or scratches on the back surface including the inner peripheral surface, the recesses or scratches can be detected with high accuracy. Further, when burrs are present on the outer peripheral surface and the inner peripheral surface, the burrs can be reliably detected.

Further, in the visual inspection device of the third aspect, the back surface side blue illumination unit includes a first back surface side blue illumination unit arranged on the lower side and a second back surface side blue illumination unit arranged on the upper side. Consists of
The first back surface side blue illumination unit has an annular light projection unit arranged coaxially with the image pickup optical axis of the back surface imaging camera, and is blue toward the back surface imaging position above the light projection unit. Configured to irradiate light
The second back surface side blue illumination unit is a dome-shaped reflective member having an opening at the upper end portion and an opening at the lower end portion through which light emitted from the light projecting portion of the first back surface side blue illumination unit passes. It has a reflective member whose inner surface is a diffuse reflection surface, and an annular light projecting portion which is arranged on the lower edge portion of the reflective member and irradiates blue light toward the inner surface of the reflective member. It is possible to adopt an embodiment configured to irradiate the light emitted from the light projecting unit and reflected by the diffuse reflection surface toward the back surface imaging position.

As in this aspect (fourth aspect), by illuminating the annular resin product with the first back surface side blue illumination unit and the second back surface side blue illumination unit, the back surface can be illuminated more uniformly, and the recesses and recesses can be illuminated. If there are scratches, these can be emphasized more.

Further, in any one of the first to fourth aspects, the visual inspection device further includes an outer surface imaging device that images the outer surface of the inspection object transported by the transport device.
The outer surface imaging device is arranged above the glass plate at an outer surface imaging position set on the transport path of the inspection object, and is an outer surface of the inspection object located at the outer surface imaging position. An outer surface imaging camera that captures images and
Below the outer surface imaging camera, the reflected light reflected from the outer surface of the inspection object is imaged on the outer surface, which are arranged at equal intervals radially around the vertical axis passing through the center point of the outer surface imaging position. Multiple prisms with optical paths leading to the camera
It has an annular light projecting unit that is arranged between the prism and the glass plate and is arranged coaxially with the vertical axis, and emits red light from the light projecting unit toward the center side. The outer surface inspection red illumination unit for illuminating the outer surface of the inspection object at the outer surface imaging position is provided.
The determination device can further take an aspect configured to process the image captured by the outer surface imaging device to determine the quality of the appearance of the inspection object.

The outer surface imaging device in this aspect (fifth aspect) is a device that literally images the outer surface of the cyclic resin product which is the inspection target. Since this outer surface is a side surface close to a glass plate, the image cannot be directly captured by the outer surface imaging camera, and it is difficult to illuminate with a sufficient amount of light.

Therefore, in this outer surface imaging device, red illumination light, which is difficult to scatter reflected light, is used as illumination light, and a light projecting portion that irradiates the red light is arranged in an annular shape to form an outer surface of the annular inspection object. Was illuminated with red light. Further, a plurality of prisms having an optical path for guiding the reflected light reflected from the outer surface of the inspection object to the outer surface imaging camera are radially centered on the vertical axis passing through the center point of the outer surface imaging position. Arranged at intervals.

Thus, according to this outer surface imaging device, since the outer surface, which is the inspection site, is illuminated with red light, a sufficient amount of reflected light reflected by the outer surface is transmitted through the prism. It can be guided to the outer side imaging camera. Therefore, when there are recesses or scratches on the outer surface of the inspection object, an image in which the recesses or scratches are emphasized is captured by the outer surface imaging camera, whereby the determination device can capture the inspection target. Whether or not there are recesses or scratches on the outer side surface can be determined with high accuracy.

Further, the outer surface imaging device according to the fifth aspect is further arranged above the outer surface imaging position and inside the prism, and directs red light toward the lower outer surface imaging position. The upper emphasized illumination part for the outer surface to irradiate,
At the outer surface imaging position, it is possible to adopt an embodiment in which the outer surface is provided below the glass plate and is provided with a lower emphasized illumination unit for the outer surface that irradiates red light upward.

In this aspect (sixth aspect), the outer surface of the inspection object is illuminated obliquely by the upper emphasized illumination unit for the outer surface and the lower emphasized illumination unit for the outer surface, so that recesses and scratches are formed on the outer surface. If present, the recesses and scratches can be emphasized to be more prominent.

Further, in any one of the first to sixth aspects, the visual inspection device further includes an inner surface imaging device that images the inner surface of the inspection object transported by the transport device.
The inner surface imaging device is arranged above the glass plate at the inner surface imaging position set on the transport path of the inspection object, and is an inner surface of the inspection object located at the inner surface imaging position. An inner side imaging camera that captures images and
Below the inner side surface imaging camera, the reflected light reflected from the inner side surface of the inspection object is imaged on the inner side surface, which is arranged at equal intervals radially around the vertical axis passing through the center point of the inner side surface imaging position. Multiple prisms with optical paths leading to the camera
It has an annular light projecting unit that is arranged between the prism and the glass plate and is arranged coaxially with the vertical axis, and emits red light from the light projecting unit toward the center side. A red illumination unit for internal surface inspection that illuminates the inner surface of the inspection object at the inner surface imaging position is provided.
The determination device can further take an aspect configured to process the image captured by the inner surface imaging device to determine the quality of the appearance of the inspection object.

The inner surface imaging device in this aspect (seventh aspect) is a device that literally images the inner surface of the annular resin product which is the inspection target, but like the outer surface imaging device, the inner surface is a glass plate. Since the side surface is close to the above, the image cannot be directly captured by the inner side imaging camera, and it is difficult to illuminate with a sufficient amount of light.

Therefore, in this inner surface imaging device, as in the case of the outer surface imaging device, red illumination light that is difficult to scatter reflected light is used as illumination light, and light projecting portions that irradiate the red light are arranged in an annular shape. , The inner surface of the annular inspection object was illuminated with red light. Further, a plurality of prisms having an optical path formed to guide the reflected light reflected from the inner side surface of the inspection object to the inner side surface imaging camera are radially centered on a vertical axis passing through the center point of the inner side surface imaging position. Arranged at intervals.

Thus, according to this inner surface imaging device, since the inner surface, which is the inspection site, is illuminated with red light as in the outer surface imaging device, a sufficient amount of reflected light reflected by the inner surface is reflected. Can be guided to the inner surface imaging camera via the prism. Therefore, when there are recesses or scratches on the inner surface of the inspection object, an image in which the recesses or scratches are emphasized is captured by the inner surface imaging camera, whereby the determination device can capture the inspection target. Whether or not there are recesses or scratches on the inner surface can be determined with high accuracy.

Further, the inner side surface imaging device according to the seventh aspect is further arranged above the inner side surface imaging position and inside the prism, and directs red light toward the lower inner side surface imaging position. The upper emphasized illumination part for the inner side to irradiate,
At the inner side surface imaging position, it is possible to adopt an embodiment in which the inner side surface is provided below the glass plate and the inner side surface is provided with a lower emphasized illumination unit for irradiating red light upward.

In this aspect (eighth aspect), the inner side surface of the inspection object is illuminated obliquely by the inner side surface upper emphasized illumination unit and the inner side surface lower emphasis illumination unit, so that recesses and scratches are formed on the inner surface surface. If present, the recesses and scratches can be emphasized to be more prominent.

As described above, according to the visual inspection apparatus according to the present invention, when there are recesses or scratches on the surface including the outer peripheral surface and the inner peripheral surface of the annular resin product, the recesses and scratches are emphasized. When burrs are present on the outer peripheral surface or the inner peripheral surface, a color image in which the burrs are emphasized is captured by the surface imaging camera. Alternatively, it is possible to determine with high accuracy whether or not there is a burr. In particular, in the case of a dark-colored or black resin molded product, it is difficult to detect recesses and scratches by illumination with white light, but according to the visual inspection apparatus according to the present invention, such a dark-colored or black resin molded product is used. Even in the case of a product, the presence or absence of recesses and scratches can be detected with high accuracy.

It is a top view which showed the schematic structure of the appearance inspection apparatus which concerns on one Embodiment of this invention by a partial block diagram. It is a vertical cross-sectional view which showed the main structure of the surface image pickup apparatus which concerns on this embodiment. It is explanatory drawing which showed the image image | positioned with the surface image pickup apparatus which concerns on this embodiment. It is a vertical cross-sectional view which showed the main structure of the back surface imaging apparatus which concerns on this embodiment. It is explanatory drawing which showed the image image | positioned with the back surface imaging apparatus which concerns on this embodiment. It is a vertical cross-sectional view which showed the main structure of the outer surface image pickup apparatus which concerns on this embodiment. It is explanatory drawing which showed the image image | positioned with the outer surface image pickup apparatus which concerns on this embodiment. It is a vertical cross-sectional view which showed the main structure of the inner side image pickup apparatus which concerns on this embodiment. It is explanatory drawing which showed the image image | positioned with the inner surface image pickup apparatus which concerns on this embodiment.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of a visual inspection apparatus according to an embodiment of the present invention in a partial block diagram.

As shown in FIG. 1, the visual inspection device 1 of this example is composed of an operation mechanism unit 5, a determination device 70, and a control device 80, and the operation mechanism unit 5 includes a transfer device 10 for transporting an inspection object K. The transport device 10 is composed of a front surface image pickup device 20, a back surface image pickup device 30, an outer surface image pickup device 40, an inner side surface image pickup device 50, a non-defective product recovery device 60, and a defective product recovery device 65 sequentially arranged along the transport direction of the transport device 10. To. The determination device 70 and the control device 80 are composed of a computer including a CPU, RAM, ROM, and the like.

[Transport device]
The transport device 10 is composed of a transparent disk-shaped glass plate 11 arranged horizontally and a drive motor 12 for horizontally rotating the glass plate 11, and is provided on the upstream side (not shown). ), The inspection object K sequentially supplied onto the glass plate 11 is conveyed in the rotation direction of the glass plate 11. In this example, cyclic resin molded products such as O-rings, gaskets, and packings are the objects to be inspected.

[Surface imaging device]
As shown in FIG. 2, the surface imaging device 20 includes a surface imaging camera 21, a surface-side blue illumination unit 22, a surface-side red illumination unit 25, and a surface inspection green illumination unit 26. It said surface imaging camera 21 is disposed above the inspection object K surface imaging position P ₁ which is set on the transport path of the color image of the inspection object K surface located on the surface image pickup position P ₁ To image. The surface imaging camera 21 is a so-called color camera equipped with a 3-COMS image sensor.

The surface blue illumination unit 22, the a top surface imaging position P _1, in between the glass plate 11 and the surface imaging camera 21, a first surface blue illumination unit 23 which is disposed on the upper side , And a second surface-side blue illumination unit 24 arranged on the lower side. The first surface-side blue illumination unit 23 includes a plurality of light projection units 23b arranged coaxially and annularly with the image pickup light axis of the surface image pickup camera 21, and a cup having an open upper surface and lower surface for supporting the light projection unit 23b. consists Jo supports 23a, light projecting portion 23b is disposed on the bottom surface of the recess of the support member 23a, irradiates blue light having directivity toward the surface imaging position P ₁ of the lower.

The second surface-side blue illumination unit 24 is a dome-shaped reflective member having an opening at the lower end and an opening at the upper end to which the support 23a is connected, and the inner surface is a diffuse reflection surface. The reflective member 24a, the ring member 24b provided at the lower end of the reflective member 24a, and the upper surface of the ring member 24b, which is annularly arranged in the reflective member 24a, is formed on the inner surface of the reflective member 24a. It is composed of a plurality of light projecting units 24c that irradiate blue light toward the light. The blue light emitted from the light projecting unit 24c is reflected by the diffuse reflecting surface of the reflecting member 24a, it is radiated toward the surface imaging position P ₁ as no uniform light directivity.

The surface-side red illumination unit 25 is a ring-shaped support 25a arranged coaxially with the imaging optical axis of the surface imaging camera 21 between the second surface-side blue illumination unit 24 and the glass plate 11. , And a plurality of light projecting portions 25b which are arranged in an annular shape on the inner peripheral surface of the support 25a and irradiate red light having directivity toward the center side of the support 25a. Light emitted from the light projecting unit 25b mainly illuminate the outer and inner peripheral surfaces of the surface of the inspection object K located on the surface imaging position P _1.

The green illumination unit 26 for surface inspection _{is arranged below the glass plate 11 at the surface imaging position P 1} , is arranged in a multi-row, multi-column plane shape, and is green toward the upper side. It is composed of a plurality of light projecting portions 26b that irradiate light, a cup-shaped support 26a having an open upper surface that supports the light projecting portion 26b, and a diffusion plate 26c that closes the upper surface of the support body 26a. The surface inspection green illumination unit 26 functions as a backlight of the inspection object K on the surface imaging position P ₁ is illuminated with no uniform light directivity from below mirror the contours of the inspection object K ..

[Back side imager]
As shown in FIG. 4, the back surface imaging device 30 has a configuration in which the front surface imaging device 20 is turned upside down, and includes a back surface imaging camera 31, a back surface side blue illumination unit 32, a back surface side red illumination unit 35, and a back surface. It is configured to include a green lighting unit 36 for inspection. The back surface imaging camera 31 is _{arranged below the back surface imaging position P 2} set on the transport path of the inspection object K, and captures a color image of the back surface of the inspection object K at the back surface imaging position P _2. Take an image. The back surface imaging camera 31 is a so-called color camera equipped with a 3-COMS image sensor.

The back surface side blue illumination unit 32 is a first back surface side blue illumination unit that is above the back surface imaging position P ₂ and is arranged on the lower side between the back surface imaging camera 31 and the glass plate 11. It is composed of 33 and a second back surface side blue illumination unit 34 arranged on the upper side. The first back surface side blue illumination unit 33 includes a plurality of light projecting units 33b arranged coaxially and annularly with the image pickup light axis of the back surface imaging camera 31, and a cup having an open upper surface and lower surface supporting the light projecting unit 33b. consists Jo of support 33a, the light projecting portion 33b is disposed in the recess bottom surface of the support member 33a, is irradiated with blue light having directivity toward above the back of the image position P _2.

Further, the second back surface side blue illumination unit 34 is a reflective member having an inverted dome shape having an opening at the upper end and an opening at the lower end to which the support 33a is connected, and the inner surface is diffused. The reflective member 34a serving as a reflective surface, the ring member 34b provided at the upper end of the reflective member 34a, and the lower surface of the ring member 34b, which is annularly arranged in the reflective member 34a, is the reflective member. It is composed of a plurality of light projecting units 34c that irradiate blue light toward the inner surface of 34a. The blue light emitted from the light projecting unit 34c is reflected by the diffuse reflecting surface of the reflecting member 34a, is radiated toward the back of the image position P ₂ as no uniform light directivity.

The back surface side red illumination unit 35 is a ring-shaped support 35a arranged coaxially with the imaging optical axis of the back surface imaging camera 31 between the second back surface side blue illumination unit 34 and the glass plate 11. , And a plurality of light projecting portions 35b which are arranged in an annular shape on the inner peripheral surface of the support 35a and irradiate red light having directivity toward the center side of the support 35a. Light emitted from the light projecting unit 35b mainly illuminate the outer and inner peripheral surfaces of the back side of the inspection object K which are in the back imaging position P _2.

The back test green illumination unit 36, in the surface imaging position P _2, intended to be disposed above the glass plate 11 is disposed in the plane of the multi-row multi-column, a green downward It is composed of a plurality of light projecting portions 36b that irradiate light, a cup-shaped support 36a having an open lower surface that supports the light projecting portion 36b, and a diffusion plate 36c that closes the lower surface of the support 36a. The backside inspection green illumination unit 36 functions as a backlight of the inspection object K on the back imaging position P ₂ is illuminated with no uniform light directivity from above imaging an outline of the inspection object K ..

[Outer surface imaging device]
As shown in FIG. 6, the outer surface imaging device 40 includes an outer surface imaging camera 41, a light guide unit 42, a red illumination unit 45 for outer surface inspection, an upper emphasis illumination unit 46 for the outer surface, and a lower emphasis for the outer surface. It is configured to include a lighting unit 47.

The outer side surface imaging camera 41, the outer surface imaging position P ₃ which is set on the conveying path of the inspection object K, is disposed above said glass plate 11 lies on the outer side surface imaging position P ₃ An image of the outer surface of the inspection object K is taken. The outer surface imaging camera 41 may be a color camera like the front surface imaging camera 21 and the back surface imaging camera 31, but since it captures a single color image, it is a monochrome camera due to cost requirements. Is preferable.

The light guide portion 42 is arranged below the outer surface imaging camera 41, and has a disc-shaped transparent support plate 43 and six prisms 44 fixed to the lower surface of the support plate 43. It is composed of and. Each prism 44, the outer surface being equally spaced radially around a vertical axis passing through the center point of the imaging position P _3, the first prism 44a and positioned inside which is positioned radially outwardly of the respective support plates 43 The second prism 44b is formed, and the outer inner surface of the first prism 44a and the inner inner surface of the second prism 44b are reflective surfaces, respectively. Thus, in this prism 44, the reflected light reflected from the outer surface of the inspection object K enters the first prism 44a, is reflected on the outer inner surface thereof, and then enters the second prism 44b. Then, it is reflected by the inner surface of the inner surface and enters the outer surface imaging camera 41 via the support plate 43 (see the two-point chain line shown in FIG. 6).

The red illumination unit 45 for inspection of the outer surface is a ring-shaped support 45a arranged coaxially with the vertical axis between the light guide unit 42 and the glass plate 11, and the inside of the support 45a. A plurality of light projecting portions 45b are provided on the peripheral surface in an annular shape in two upper and lower stages and irradiating red light having directivity toward the center side of the support 45a. Light emitted from the light projecting unit 45b mainly illuminate the outer surface and the inner surface of the inspection object K located in the outer side surface imaging position P _3.

It said outer surface for the upper enhancement illumination unit 46 is a above said outer surface imaging position P _3, is disposed inside of the prism 44, toward the red light to the outer side surface imaging position P ₃ of the lower It is composed of a plurality of light emitting portions 46b to be irradiated, a cup-shaped support 46a having an open lower surface for supporting the light projecting portion 46b, and a diffusion plate 46c for closing the lower surface of the support 46a. The outer surface for the upper enhancement illumination unit 46 illuminates the inspection object K which lies outside surface imaging position P ₃ with no homogeneous light directivity from above.

The outer side surface for the lower enhancement illumination unit 47 in the outer side surface imaging position P _3, is arranged below the glass plate 11, a plurality of light projecting unit 47b for irradiating red light upward, It is composed of a cup-shaped support 47a having an open upper surface that supports the light projecting portion 47b, and a diffusion plate 47c that closes the upper surface of the support 47a. The outer surface for the lower enhancement illumination unit 47 illuminates the inspection object K which lies outside surface imaging position P ₃ with no homogeneous light directivity from below.

[Inner side imager]
The inner side image pickup device 50 has a configuration in which the outer side surface image pickup device 40 is shifted upward, and as shown in FIG. 8, the inner side surface image pickup camera 51, the light guide unit 52, and the red illumination for inner side surface inspection are provided. It is configured to include a portion 55, an upper highlighting illumination portion 56 for the inner side surface, and a lower highlighting illumination portion 57 for the inner side surface.

The inner surface imaging camera 51, the inner surface image pickup position P ₄ that are set on the conveying path of the inspection object K, is disposed above said glass plate 11 lies on the inner surface image pickup position P ₄ An image of the inner surface of the inspection object K is taken. The inner side image pickup camera 41 may be a color camera like the front surface image pickup camera 21 and the back surface image pickup camera 31, but since it captures a single color image, it is a monochrome camera due to cost reasons. Is preferable.

The light guide portion 52 is arranged below the inner side surface imaging camera 51, and has a disc-shaped transparent support plate 53 and six prisms 54 fixed to the lower surface of the support plate 53. It is composed of and. Each prism 54 is radially disposed at equal intervals around a vertical axis passing through the center point of the inner surface image pickup position P _4, the first prism 54a and positioned inside which is positioned radially outwardly of the respective support plates 53 The second prism 54b is formed, and the outer inner surface of the first prism 54a and the inner inner surface of the second prism 54b are reflective surfaces, respectively. Thus, in this prism 54, the reflected light reflected from the outer surface of the inspection object K enters the first prism 54a, is reflected by the outer inner surface thereof, and then enters the second prism 54b. Then, it is reflected by the inner surface of the inner surface and enters the inner side surface imaging camera 51 via the support plate 53 (see the two-point chain line shown in FIG. 8).

The red illumination unit 55 for inner surface inspection is a ring-shaped support 55a arranged coaxially with the vertical axis between the light guide unit 52 and the glass plate 11, and the inside of the support 55a. A plurality of light projecting portions 55b are provided on the peripheral surface in an annular shape in two upper and lower stages and irradiating red light having directivity toward the center side of the support 55a. Light emitted from the light projecting unit 55b mainly illuminate the outer surface and the inner surface of the inspection object K which lies the inner surface imaging position P _4.

The inner surface for the upper enhancement illumination unit 56 is an upward from the inner surface image pickup position P _4, disposed inside of the prism 54, toward the red light to the inner surface image pickup position P ₄ of the lower It is composed of a plurality of light emitting portions 56b to be irradiated, a cup-shaped support 56a having an open lower surface for supporting the light projecting portion 56b, and a diffusion plate 56c for closing the lower surface of the support 56a. The inner surface for the upper enhancement illumination unit 56 illuminates with no homogeneous light directivity of the inspection object K located on the inner surface image pickup position P ₄ from above.

The inner surface for the lower enhancement illumination unit 57 in the inner surface image pickup position P _4, is disposed below the glass plate 11, a plurality of light projecting unit 57b for irradiating red light upward, It is composed of a cup-shaped support 57a having an open upper surface that supports the light projecting portion 57b, and a diffusion plate 57c that closes the upper surface of the support 57a. The inner surface for the lower enhancement illumination unit 57 illuminates the inspection object K located on the inner surface imaging position P ₄ with no homogeneous light directivity from below.

[Good product collection device and defective product collection device]
The non-defective product recovery device 60 and the defective product recovery device 65 each have a nozzle that discharges compressed air from the center of the glass plate 11 in the radial direction outward, and a nozzle that discharges compressed air from the nozzle in the radial direction. It is equipped with a collection box for collecting the inspection object K blown to the outside. Then, under the control of the control device 80, the non-defective product collection device 60 collects the inspection object K determined to be a non-defective product, and the defective product collection device 65 collects the inspection object K determined to be a defective product. ..

[Judgment device]
The determination device 70 processes each image captured by the front surface imaging device 20, the back surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50, and, for example, from the brightness level of the obtained image, It is determined whether or not there are recesses or scratches on the inspection object K, and whether or not there are burrs from the contour shape of the image. If there are no recesses, scratches or burrs, it is judged as a non-defective product. However, if any of recesses, scratches, and burrs is present, it is determined to be a defective product. Then, the determination device 70 transmits the determination result to the control device 80.

[Control device]
The control device 80 controls the operations of the transport device 10, the front surface imaging device 20, the back surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50, and according to the determination result transmitted from the determination device 70. The operation of the non-defective product collection device 60 and the defective product collection device 65 is controlled.

According to the appearance inspection device 1 of this example having the above configuration, the appearance of the cyclic resin product which is the inspection target K is inspected as follows.

That is, the inspection object K is sequentially supplied onto the glass plate 11 of the transport device 10 from an appropriate supply device (not shown) provided on the upstream side, and the rotation direction of the glass plate 11 (indicated by the arrow shown in FIG. 1). It is conveyed in the direction) and sequentially passes through the front surface imaging device 20, the back surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50.

Then, the front surface imaging device 20, the back surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50 capture images of the front surface, the back surface, the outer surface, and the inner surface of the inspection object K, and the images are captured. Is transmitted to the determination device 70.

Specifically, the in surface imaging device 20, the surface image pickup position at P _1, the surface-side blue illumination unit 22 which the inspection object K is composed of a first surface blue illumination part 23 and a second surface blue illumination unit 24 , The surface image pickup camera 21 captures a color image of the surface of the surface while being illuminated by the surface side red illumination unit 25 and the surface inspection green illumination unit 26.

That is, directional blue light is emitted from the first surface side blue illumination unit 23 to the upper surface of the inspection object K, and the blue light diffused from the second surface side blue illumination unit 24 is the inspection object. The upper surface of K is irradiated, and these lights illuminate the upper surface of the inspection object K. Further, directional red light is emitted from the surface-side red illumination unit 25 to the outer peripheral surface and the inner peripheral surface of the inspection object K on the surface side. Further, green light from the surface inspection green illumination unit 26 irradiates the inspection object K from below as a backlight. Thus, the inspection object K illuminated in this way is imaged by the surface imaging camera 21, the background portion FGa is green, and the outer peripheral portion and inner peripheral portion FGb are red, as shown in FIG. A color image FG in which the upper surface portions FGc and FGb are blue can be obtained.

Since blue light is easily scattered, it has a characteristic that the amount of reflected light from the inspection object K is small, and since red light is difficult to scatter, it has a characteristic that the amount of reflected light from the inspection object K is large. On the other hand, due to the shape characteristics of the inspection object K, it is difficult to obtain the amount of reflected light on the outer peripheral surface and the inner peripheral surface on the surface side thereof, and conversely, the amount of reflected light can be obtained on the surfaces other than the outer peripheral surface and the inner peripheral surface of the inspection object. It tends to be easy to get rid of.

Therefore, as described above, by irradiating the outer peripheral surface and the inner peripheral surface of the inspection object K for which it is difficult to obtain the amount of reflected light with red light having low scattering property, the concave portions existing on the outer peripheral surface and the inner peripheral surface are irradiated. And an appropriate amount of reflected light capable of detecting scratches can be guided to the surface imaging camera 21. Further, by irradiating the surface other than the outer peripheral surface and the inner peripheral surface of the inspection object K, in which the amount of reflected light can be easily obtained, with highly scatterable blue light, recesses and scratches existing on the surface can be detected. An appropriate amount of reflected light can be guided to the surface imaging camera 21. Further, by illuminating the inspection object K with green light other than blue and red as a backlight, the outline of the inspection object K can be projected, and when burrs are present on the outer peripheral surface and the inner peripheral surface of the inspection object K, the inspection object K can be projected. , The shape of this burr is projected as the outline of the inspection object K.

Thus, in the surface imaging device 20, when there are recesses and scratches on the surface of the inspection object K, an image in which the recesses and scratches are emphasized can be obtained, and the outer peripheral surface of the inspection object K can be obtained. And when burrs are present on the inner peripheral surface, an image in which the burrs are emphasized can be obtained. Then, the determination device 70 determines whether or not there are defects such as recesses, scratches, and burrs on the surface of the inspection object K based on such an image, so that the determination can be performed with high accuracy. it can.

Also in the back imaging device 30, similarly to the surface imaging device 20, in the back imaging position P _2, the back surface of the inspection object K is composed of the first back side blue illumination unit 33 and the second back side blue illumination unit 34 A color image of the back surface is captured by the back surface imaging camera 31 in a state of being illuminated by the side blue illumination unit 32, the back surface side red illumination unit 35, and the back surface inspection green illumination unit 36.

That is, directional blue light is emitted from the first back surface side blue illumination unit 33 to the lower surface of the inspection object K, and the blue light diffused from the second back surface side blue illumination unit 34 is the inspection object. The lower surface of K is irradiated, and these lights illuminate the lower surface of the inspection object K. Further, the directional red light is emitted from the back surface side red illumination unit 35 to the outer peripheral surface and the inner peripheral surface on the back surface side of the inspection object K. Further, green light is emitted from above the inspection object K as a backlight from the back surface inspection green illumination unit 36. Thus, the inspection object K illuminated in this way is imaged by the back surface imaging camera 31, and as shown in FIG. 5, the background portion RGa is green, and the outer peripheral portion and inner peripheral portion RGb are red. A color image RG in which the lower surface portions RGc and RGb are blue can be obtained.

As described above, by irradiating the outer peripheral surface and inner peripheral surface of the inspection object K for which it is difficult to obtain the amount of reflected light with red light having low scattering property, recesses and scratches existing on the outer peripheral surface and inner peripheral surface are present. An appropriate amount of reflected light that can detect the above can be guided to the back surface imaging camera 31. Further, by irradiating the back surface other than the outer peripheral surface and the inner peripheral surface of the inspection object K where the amount of reflected light can be easily obtained with highly scatterable blue light, recesses and scratches existing on the back surface can be detected. An appropriate amount of reflected light can be guided to the back surface imaging camera 31. Further, by illuminating the inspection object K with green light other than blue and red as a backlight, the outline of the inspection object K can be projected, and when burrs are present on the outer peripheral surface and the inner peripheral surface of the inspection object K, the inspection object K can be projected. , The shape of this burr is projected as the outline of the inspection object.

Thus, in the back surface imaging device 30, when there are recesses and scratches on the back surface of the inspection object K, an image in which the recesses and scratches are emphasized can be obtained, and the outer peripheral surface of the inspection object K can be obtained. And when burrs are present on the inner peripheral surface, an image in which the burrs are emphasized can be obtained. Then, the determination device 70 determines whether or not there are defects such as recesses, scratches, and burrs on the back surface of the inspection object K based on such an image, so that the determination can be performed with high accuracy. it can.

Further, in the outer side surface image pickup apparatus 40, in the outer side surface imaging position P _3, red light having directivity from said outer surface inspection red illumination unit 45 is irradiated on the outer surface and inner surface of the inspection object K The homogeneous red light diffused from the outer surface-upper-enhanced illumination unit 46 is applied to the upper outer surface and the inner surface of the inspection object K, and the same from the outer-surface lower-enhanced illumination unit 47. The diffused homogeneous red light is applied to the lower outer surface and inner surface of the inspection object K.

Then, the reflected light reflected from the outer surface of the inspection object K illuminated as described above is input to the outer surface imaging camera 41 via the first prism 44a, the second prism 44b, and the support plate 43. A monochrome image as shown in FIG. 7 is captured by the outer surface imaging camera 41.

Since the outer surface of the inspection object K is a side surface close to the glass plate 11, the image cannot be directly captured by the outer surface imaging camera 41. However, by providing the light guide portion 42, the inspection object K can be inspected. An image of the outer surface can be captured. Further, although it is difficult to illuminate the outer surface of the inspection object K with a sufficient amount of light, the outer surface imaging device 40 uses red illumination light as the illumination light, which is difficult for reflected light to scatter, and uses this red light. Since the outer surface of the inspection object K is irradiated, a sufficient amount of reflected light reflected by the outer surface can be guided to the outer surface imaging camera 41. Further, by illuminating the outer surface of the inspection object K from an angle with the upper red illumination unit 46 for the outer surface and the lower red illumination unit 47 for the outer surface, when there are recesses or scratches on the outer surface, The recesses and scratches can be emphasized to be more prominent.

Thus, in the outer surface imaging device 40, when there are recesses and scratches on the outer surface of the inspection object K, an image in which the recesses and scratches are emphasized can be obtained. Then, the determination device 70 determines whether or not there is a defect such as a recess or a scratch on the outer surface of the inspection object K based on such an image, so that the determination can be performed with high accuracy. ..

Further, the inner surface imaging device 50, in the inner surface image pickup position P _4, red light having directivity from the inner surface inspection red illumination unit 55 is irradiated on the outer surface and inner surface of the inspection object K, The homogeneous red light diffused from the inner side surface emphasized illumination unit 56 is irradiated to the upper outer surface and the inner surface of the inspection object K, and is also diffused from the inner side surface lower emphasis illumination unit 57. The homogeneous red light is applied to the lower outer surface and inner surface of the inspection object K.

Then, the reflected light reflected from the inner side surface of the inspection object K illuminated as described above is input to the inner side surface imaging camera 51 via the first prism 54a, the second prism 54b, and the support plate 53. A monochrome image as shown in FIG. 9 is captured by the inner surface imaging camera 51.

Since the inner surface of the inspection object K is a side surface close to the glass plate 11, the image cannot be directly captured by the inner surface imaging camera 51. However, by providing the light guide portion 52, the inspection object K can be inspected. An image of the inner surface can be taken. Further, although it is difficult to illuminate the inner surface of the inspection object K with a sufficient amount of light, the inner surface imaging device 50 uses red illumination light as the illumination light, which is difficult for reflected light to scatter, and uses this red light. Since the inner surface of the inspection object K is irradiated, a sufficient amount of reflected light reflected by the inner surface can be guided to the inner surface imaging camera 51. Further, when the outer surface of the inspection object K is obliquely illuminated by the upper red illumination unit 56 for the inner surface and the lower red illumination unit 57 for the inner surface, when there are recesses or scratches on the outer surface, The recesses and scratches can be emphasized to be more prominent.

Thus, in the inner surface imaging device 50, when the concave portion and the scratch are present on the outer surface of the inspection object K, an image in which the concave portion and the scratch are emphasized can be obtained. Then, the determination device 70 determines whether or not there is a defect such as a recess or a scratch on the outer surface of the inspection object K based on such an image, so that the determination can be performed with high accuracy. ..

Then, as described above, the determination device 70 determines the inspection target object K based on the images captured by the front surface imaging device 20, the back surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50, respectively. It is determined whether or not there is a defect, and the determination result is transmitted to the control device 80. Then, the control device 80 receives this determination result, and for the inspection object K for which no defect is detected, drives the non-defective product collection device 60 at the timing when the inspection object K reaches the non-defective product collection device 60. Then, the inspection object K is collected, and for the inspection object K in which a defect is detected, the defective product collection device 65 is driven at the timing when the inspection object K reaches the defective product collection device 65. Then, the inspection object K is collected.

As described in detail above, according to the appearance inspection device 1 of this example, there are defects such as recesses, scratches, burrs, etc. on the front and back surfaces including the outer peripheral surface and the inner peripheral surface of the inspection object K, which is an annular resin product. When this is done, this can be detected with high accuracy and sorted. In particular, in the case of a dark-colored or black resin molded product, it is difficult to detect recesses and scratches by illumination with white light, but according to the visual inspection device 1 of this example, such a dark-colored or black resin molded product is used. Even in the case of a product, the presence or absence of recesses and scratches can be detected with high accuracy.

Although one embodiment of the present invention has been described above, the specific embodiments that the present invention can take are not limited to those of the above examples.

For example, in the above example, six prisms 44 are provided as the light guide portion 42, and six prisms 54 are provided as the light guide portion 52, but the number of prisms 44 and 54 is not limited to this, and 2 It suffices if the above number is provided.

1 Visual inspection device 10 Conveyor device 20 Surface imaging device 21 Surface imaging camera 22 Surface side blue lighting unit 23 1st surface side blue lighting unit 24 2nd surface side blue lighting unit 25 Surface side red lighting unit 26 Green lighting unit for surface inspection 30 Back side imaging device 31 Back side imaging camera 32 Back side blue lighting unit 33 1st back side blue lighting unit 34 2nd back side blue lighting unit 35 Back side red lighting unit 36 Back side inspection green lighting unit 40 External side imaging device 41 Outside Side imaging camera 42 Light guide 45 Red lighting for outer side inspection 46 Upper highlighted lighting for outer side 47 Lower highlighted lighting for outer side 50 Inner side imager 51 Inner side imaging camera 52 Light guide 55 Inner side inspection Red lighting unit 56 Upper lighting unit for inner side surface 57 Lower emphasized lighting unit for inner side surface 60 Good product recovery device 65 Defective product recovery device 70 Judgment device 80 Control device

Claims (8)

An visual inspection device that inspects the appearance of an annular resin product as an inspection object.
A transport device provided with a transparent disk-shaped glass plate arranged horizontally, the glass plate is rotated horizontally, and the inspection object supplied on the glass plate is conveyed in the rotation direction of the glass plate. When,
A surface imaging device that images the surface of the inspection object transported by the transport device, and
A determination device for processing an image captured by the surface imaging device to determine the quality of the appearance of the inspection object is provided.
The surface imaging device is arranged above the surface imaging position set on the transport path of the inspection object, and images a color image of the surface of the inspection object at the surface imaging position. With the camera
A surface-side blue illumination unit that is above the surface imaging position and is arranged between the surface imaging camera and the glass plate to irradiate the surface of an inspection object at the surface imaging position with blue light. When,
It has an annular light projecting unit that is arranged between the front surface side blue illumination unit and the glass plate and is arranged coaxially with the imaging light axis of the surface imaging camera, and is red from the light projecting unit. A surface-side red illumination unit that illuminates the outer peripheral surface and inner peripheral surface of the inspection object at the surface imaging position by irradiating light toward the center side.
An appearance inspection apparatus characterized in that, at the surface imaging position, a green illumination unit for surface inspection is provided below the glass plate and irradiates green light upward. The front surface side blue illumination unit includes a first surface side blue illumination unit arranged on the upper side and a second surface side blue illumination unit arranged on the lower side.
The first surface-side blue illumination unit has an annular light projection unit arranged coaxially with the image pickup optical axis of the surface image pickup camera, and is blue toward the surface image pickup position below the light projection unit. Configured to irradiate light
The second surface-side blue illumination unit is a dome-shaped reflective member having an opening at the lower end and an opening at the upper end through which the light emitted from the light projecting portion of the first surface-side blue illumination unit passes. It has a reflective member whose inner surface is a diffuse reflection surface, and an annular light projecting portion which is arranged on the lower edge portion of the reflective member and irradiates blue light toward the inner surface of the reflective member. The visual inspection apparatus according to claim 1, wherein the light projected from the light projecting unit and reflected by the diffuse reflection surface is irradiated toward the surface imaging position. The visual inspection device further includes a back surface imaging device that images the back surface of the inspection object transported by the transport device.
The back surface imaging device is arranged below the glass plate at the back surface imaging position set on the transport path of the inspection object, and captures a color image of the back surface of the inspection object at the back surface imaging position. Backside imaging camera and
A backside blue illumination unit that is below the backside imaging position and is disposed between the backside imaging camera and the glass plate to irradiate the back surface of an inspection object at the backside imaging position with blue light. When,
It has an annular light projecting unit that is arranged between the back surface side blue illumination unit and the glass plate and is arranged coaxially with the imaging light axis of the back surface imaging camera, and is red from the light projecting unit. A red illumination unit on the back surface side that illuminates the outer peripheral surface and the inner peripheral surface on the back surface side of the inspection object at the back surface imaging position by irradiating light toward the center side.
At the back surface imaging position, a green illumination unit for back surface inspection, which is arranged above the glass plate and irradiates green light downward, is provided.
The first or second aspect of the invention, wherein the determination device is further configured to process an image captured by the back surface imaging device to determine the quality of the appearance of the inspection object. Visual inspection equipment. The back surface side blue illumination unit includes a first back surface side blue illumination unit arranged on the lower side and a second back surface side blue illumination unit arranged on the upper side.
The first back surface side blue illumination unit has an annular light projection unit arranged coaxially with the image pickup optical axis of the back surface imaging camera, and is blue toward the back surface imaging position above the light projection unit. Configured to irradiate light
The second back surface side blue illumination unit is a dome-shaped reflecting member having an opening at the upper end portion and an opening at the lower end portion through which light emitted from the light projecting portion of the first back surface side blue illumination unit passes. It has a reflective member whose inner surface is a diffuse reflection surface, and an annular light projecting portion which is arranged on the lower edge portion of the reflective member and irradiates blue light toward the inner surface of the reflective member. The visual inspection apparatus according to claim 3, wherein the light is emitted from the light projecting unit and reflected by the diffuse reflection surface so as to irradiate the light toward the back surface imaging position. The visual inspection device further includes an outer surface imaging device that images the outer surface of the inspection object transported by the transport device.
The outer surface imaging device is arranged above the glass plate at an outer surface imaging position set on the transport path of the inspection object, and is an outer surface of the inspection object located at the outer surface imaging position. An outer surface imaging camera that captures images and
Below the outer surface imaging camera, the reflected light reflected from the outer surface of the inspection object is imaged on the outer surface, which are arranged at equal intervals radially around the vertical axis passing through the center point of the outer surface imaging position. Multiple prisms with optical paths leading to the camera
It has an annular light projecting unit that is arranged between the prism and the glass plate and is arranged coaxially with the vertical axis, and emits red light from the light projecting unit toward the center side. A red illumination unit for inspection of the outer surface, which mainly illuminates the outer surface of the inspection object at the imaging position of the outer surface, is provided.
The first to fourth aspects of the invention, wherein the determination device is further configured to process an image captured by the outer surface imaging device to determine the quality of the appearance of the inspection object. Any of the visual inspection equipment. The outer surface imaging device is further above the outer surface imaging position, is arranged inside the prism, and emits red light toward the lower outer surface imaging position. Lighting part and
The fifth aspect of the present invention, wherein the outer surface imaging position includes a lower emphasized illumination unit for the outer surface, which is arranged below the glass plate and irradiates red light upward. Visual inspection equipment. The visual inspection device further includes an inner surface imaging device that images the inner surface of the inspection object transported by the transport device.
The inner surface imaging device is arranged above the glass plate at the inner surface imaging position set on the transport path of the inspection object, and is an inner surface of the inspection object located at the inner surface imaging position. An inner side imaging camera that captures images and
Below the inner side surface imaging camera, the reflected light reflected from the inner side surface of the inspection object is imaged on the inner side surface, which is arranged at equal intervals radially around the vertical axis passing through the center point of the inner side surface imaging position. Multiple prisms with optical paths leading to the camera
It has an annular light projecting unit that is arranged between the prism and the glass plate and is arranged coaxially with the vertical axis, and emits red light from the light projecting unit toward the center side. A red illumination unit for internal surface inspection that illuminates the inner surface of the inspection object at the inner surface imaging position is provided.
The first to sixth aspects of the invention, wherein the determination device is further configured to process an image captured by the inner surface imaging device to determine the quality of the appearance of the inspection object. Any of the visual inspection equipment. The inner side surface imaging device is further above the inner side surface imaging position, is arranged inside the prism, and irradiates red light toward the lower inner side surface imaging position. Lighting part and
The seventh aspect of claim 7, wherein the inner side surface imaging position is provided below the glass plate and includes an inner side surface emphasized illumination unit that irradiates red light upward. Visual inspection equipment.

Images