JP7307520B2 - Appearance inspection device for circular products - Google Patents

Description

TECHNICAL FIELD The present invention relates to an appearance inspection apparatus that takes an image of the appearance of an article using an imaging camera, processes the obtained image, and determines the quality of the appearance of the article.

2. Description of the Related Art Conventionally, a visual inspection apparatus disclosed in Japanese Patent Laying-Open No. 2007-64801 (Patent Document 1 below) is known as the visual inspection apparatus described above. This appearance inspection apparatus inspects the appearance of an electronic component, and comprises a transport mechanism that transports the electronic component in a predetermined transport direction, and a surface of the electronic component that is transported by the transport mechanism and passes through a predetermined imaging area. Determining whether the appearance of the electronic component is good or bad based on an imaging mechanism that captures an image, a lighting device that illuminates the electronic component transported within the imaging area by the transport mechanism, and an image of the electronic component captured by the imaging mechanism. and a control unit for controlling the operation of the illumination device and the imaging mechanism.

The illumination device has a plurality of light projecting units that irradiate light toward the electronic component, and a plurality of light projecting units in which the light projecting units are arranged in an annular shape, and the light projecting units are coaxially arranged. At least one of the light projecting means is configured to irradiate the electronic component with light of a color different from that of the other light projecting means.

More specifically, each of the light projecting means comprises a first light projecting means, a second light projecting means, and a third light projecting means arranged in parallel in the axial direction, and the first light projecting means is arranged along its axis. is arranged so that the irradiation optical axis of the light projecting unit is inclined by 15° to 35° with respect to the electronic component, and is configured to irradiate blue light toward the electronic component, wherein the second light projecting means The third light projecting means is arranged such that the irradiation optical axis of the light projecting portion is inclined by 40° to 50° with respect to the axis thereof, and is configured to irradiate the electronic component with red light. is arranged such that the irradiation optical axis of the light projecting portion is inclined by 55° to 75° with respect to the axis thereof, and is configured to irradiate the electronic component with red light.

Further, the imaging mechanism is arranged such that its imaging optical axis is positioned within the arrangement ring of the light projecting units of the light projecting means, and the control unit controls the light projecting means to Among the light projecting means, the light projecting means for projecting light of the same color irradiates the electronic component with light, and the light projecting means for projecting light while the electronic component is passing through the imaging region. It is configured to change the color of the light irradiated to the electronic component by switching, and to control the imaging mechanism to capture an image of the surface of the electronic component for each color of the light irradiated to the electronic component. and the determination processing unit is configured to perform quality determination based on each image captured for each color of light irradiated to the electronic component.

According to this appearance inspection device, the blue light is irradiated with the irradiation optical axis of the light projecting part tilted from the central axis of the light projecting means by 15° to 35° (55° to 75° with respect to the surface of the electronic component). By doing so, it is possible to effectively highlight defective portions such as cracks and scratches existing on the surface of the electronic component. In addition, the red light is irradiated with the irradiation optical axis of the light projecting part tilted from the central axis of the light projecting means by 40° to 50° (40° to 50° with respect to the surface of the electronic component). By irradiating at an angle of 75° (15° to 35° with respect to the surface of the multilayer capacitor), it is possible to more effectively remove defects that exist inside electronic components, such as the floating of the laminated dielectric and internal electrodes of the multilayer capacitor. can be highlighted.

Thus, in this visual inspection apparatus, by performing the illumination as described above, it is possible to obtain an image in which the defects present in the electronic component are emphasized. By determining whether the electronic component is good or bad, it is possible to perform a more accurate visual inspection according to the characteristics of the electronic component.

Japanese Patent Application Laid-Open No. 2007-64801

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

Therefore, it is conceivable to apply visual inspection using the above-described conventional visual inspection apparatus to such resin products as well.

However, the conventional visual inspection apparatus described above was developed to be adapted to electronic components, more specifically multilayer capacitors. However, it has not been possible to satisfactorily detect defects in the appearance of resin molded products such as O-rings and packings. That is, many of the resin molded products such as the O-rings and packings have a dark color or black color. special technical development is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an appearance inspection apparatus capable of inspecting the appearance of even a circular resin molded product having a dark color or black color with high precision. and

The present invention for solving the above problems is
An appearance inspection device for inspecting the appearance of a circular resin product as an inspection object,
A conveying device comprising a horizontally arranged transparent disk-shaped glass plate, horizontally rotating the glass plate, and conveying the inspection object supplied on the glass plate in the rotating direction of the glass plate. and,
a surface imaging device for imaging the surface of the inspection object transported by the transport device;
a determination device that processes the image captured by the surface imaging device and determines whether the appearance of the inspection object is good or bad;
The surface imaging device is disposed above a surface imaging position set on the transport path of the inspection object, and captures a color image of the surface of the inspection object located at the surface imaging position. camera and
A front-side blue illumination unit disposed above the front-surface imaging position and between the front-surface imaging camera and the glass plate for irradiating the surface of the inspection object at the front-surface imaging position with blue light. and,
An annular light projecting part is provided between the front-side blue illumination part and the glass plate and coaxial with the imaging optical axis of the surface imaging camera, and a red light is emitted from the light projecting part. a surface-side red illumination unit that irradiates light toward the center to illuminate the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object located at the surface imaging position;
The present invention relates to an appearance inspection apparatus including a surface inspection green illumination unit that is disposed below the glass plate at the surface imaging position and emits green light upward.

According to the appearance inspection apparatus of this aspect (first aspect), the annular resin product to be inspected is appropriately supplied onto the glass plate of the conveying device, and is conveyed in the rotation direction by the horizontal rotation of the glass plate. . A color image of the surface of the object to be inspected is picked up by the surface image pickup camera at the surface image pickup position, and the quality of the appearance is judged by the judging device based on the picked color image.

At the surface imaging position, the surface of the inspection object is illuminated with blue light emitted from the front-side blue illumination unit, and the surface of the inspection object is illuminated with red light emitted from the front-side red illumination unit. The outer peripheral surface and the inner peripheral surface of the side are illuminated. In addition, a green illumination unit for surface inspection provided below the glass plate emits upward green light, and the object to be inspected is illuminated with this green light as a backlight.

The blue light emitted from the front-side blue illumination section is easily scattered, and thus the amount of reflected light from the inspection object is small, and the red light emitted from the front-side red illumination section is scattered. Therefore, it has a characteristic that a large amount of light is reflected from the object to be inspected. On the other hand, it is difficult to obtain the amount of reflected light from the outer and inner peripheral surfaces of the object to be inspected.

According to the surface imaging device according to the present invention, by irradiating the outer peripheral surface and the inner peripheral surface of the inspection object where it is difficult to obtain the amount of reflected light locally with red light with low scattering, the outer peripheral surface and the inner peripheral surface can be obtained. An appropriate amount of reflected light that can detect recesses and flaws present on the peripheral surface can be guided to the surface imaging camera. In addition, by irradiating highly scattering blue light on surfaces other than the outer peripheral surface and the inner peripheral surface of the inspection object, where the amount of reflected light is easy to obtain, a moderate amount of light that can detect concave portions and scratches existing on the surface is applied. A small amount of reflected light can be directed to the surface imaging camera. In addition, by illuminating with green light other than blue and red as a backlight, the outline of the inspection object can be projected. For example, an annular molded resin product is likely to have burrs on its outer and inner peripheral surfaces 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 appearance 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 or 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 concave portions and flaws with illumination using white light. 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 comprises a first surface-side blue illumination unit provided on the upper side and a second surface-side blue illumination unit provided on the lower side,
The first surface-side blue illumination unit has an annular light projecting unit arranged coaxially with the imaging optical axis of the surface imaging camera, and emits blue light from the light projecting unit toward the surface imaging position below. configured to emit light;
The second surface-side blue illumination unit is a dome-shaped reflecting member having an opening at the lower end and an opening at the upper end through which the light emitted from the light-projecting unit of the first surface-side blue illumination unit passes. a reflecting member having an inner surface serving as a diffuse reflection surface; and an annular light projecting portion disposed at the lower edge of the reflecting member and emitting blue light toward the inner surface of the reflecting member, It is possible to employ a mode in which light emitted from the light projecting section and reflected by the diffuse reflection surface is emitted toward the front surface imaging position.

As in this aspect (second aspect), by illuminating the annular resin product with the first surface-side blue illumination unit and the second surface-side blue illumination unit, the surface can be more uniformly illuminated, and the recesses and If blemishes are present, they can be more accentuated.

The appearance inspection apparatus according to the first or second aspect further includes a back surface imaging device that captures an image of the back surface of the inspection object transported by the transport device,
The back surface imaging device is disposed below the glass plate at a 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. a backside imaging camera that
A rear-side blue illumination unit disposed below the rear-surface imaging position and between the rear-surface imaging camera and the glass plate for irradiating the rear surface of the inspection object at the rear-surface imaging position with blue light. and,
An annular light projecting part is provided between the rear-side blue illumination part and the glass plate and is arranged coaxially with the imaging optical axis of the back imaging camera, and a red light is emitted from the light projecting part. a back-side red illumination unit that irradiates light toward the center to mainly illuminate the outer and inner peripheral surfaces of the back side of the inspection object located at the back-side imaging position;
a back surface inspection green illumination unit disposed above the glass plate at the back surface imaging position and emitting green light downward;
The judging device may further process the image picked up by the backside imaging device to judge whether the appearance of the object to be inspected is good or bad.

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 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. Moreover, when burrs are present on the outer peripheral surface and the inner peripheral surface, the burrs can be reliably detected.

Further, in the appearance inspection apparatus of the third aspect, the back side blue illumination section includes a first back side blue illumination section arranged on the lower side and a second back side blue illumination section arranged on the upper side. consists of
The first rear-side blue illumination section has an annular light-projecting section arranged coaxially with the imaging optical axis of the rear-surface imaging camera, and emits blue light from the light-projecting section toward the rear-surface imaging position above. configured to emit light;
The second back-side blue illumination unit is a dome-shaped reflecting member having an opening at its upper end and an opening at its lower end through which the light emitted from the light-projecting unit of the first back-side blue illumination unit passes. a reflecting member having an inner surface serving as a diffuse reflection surface; and an annular light projecting portion disposed at the lower edge of the reflecting member and emitting blue light toward the inner surface of the reflecting member, It is possible to employ a mode in which the light emitted from the light projecting section and reflected by the diffuse reflection surface is emitted toward the rear surface imaging position.

As in this aspect (fourth aspect), by illuminating the annular resin product with the first back-side blue illumination unit and the second back-side blue illumination unit, the back surface can be more uniformly illuminated, and the recesses and If blemishes are present, they can be more accentuated.

In addition, in any one of the first to fourth aspects, the appearance inspection apparatus further includes an outer surface imaging device for imaging the outer surface of the inspection object transported by the transport device,
The outer surface imaging device is disposed above the glass plate at an outer surface imaging position set on the transport path of the inspection object, and measures the outer surface of the inspection object at the outer surface imaging position. an outer surface imaging camera that captures an image;
below the outer surface imaging camera, arranged radially at equal intervals around a vertical axis passing through the center point of the outer surface imaging position, and capturing the reflected light reflected from the outer surface of the inspection object; a plurality of prisms formed with optical paths leading to the camera;
An annular light projecting part is provided between the prism and the glass plate and coaxial with the vertical axis, and red light is emitted from the light projecting part toward the center. a lateral surface inspection red illumination unit for illuminating the lateral surface of the inspection object located at the lateral surface imaging position;
The determination device may further process the image captured by the outer surface imaging device to determine whether the appearance of the object to be inspected is good or bad.

The outer surface imaging device in this aspect (fifth aspect) is literally an apparatus for imaging the outer surface of the annular resin product, which is the object to be inspected. Since this outer surface is a side surface close to the 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 apparatus, red illumination light, whose reflected light is less likely to scatter, is used as the illumination light, and the light projecting units that irradiate the red light are arranged in a ring to was illuminated with red light. In addition, a plurality of prisms formed with optical paths for guiding reflected light reflected from the outer surface of the inspection object to the outer surface imaging camera are arranged radially about a vertical axis passing through the center point of the outer surface imaging position. placed at intervals.

Thus, according to this outer surface imaging apparatus, since the outer surface, which is the part to be inspected, is illuminated with red light, a sufficient amount of reflected light reflected by the outer surface is captured via the prism. It can lead to a lateral view camera. Therefore, when there is a concave portion or a scratch on the outer surface of the inspection object, an image in which the concave portion or the scratch is emphasized is captured by the outer surface imaging camera. It is possible to determine with high accuracy whether or not there is a concave portion or a scratch on the outer surface.

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 downward to the outer surface imaging position. an upper highlighting illumination unit for the outer surface to be illuminated;
In the outer surface imaging position, it is possible to employ an aspect including an outer surface lower highlighting illumination section that is disposed below the glass plate and emits red light upward.

In this aspect (sixth aspect), the outer surface of the object to be inspected is obliquely illuminated by the outer surface upper emphasizing illumination unit and the outer surface lower emphasizing illumination unit, so that recesses and scratches are not formed on the outer surface. If they exist, they can be emphasized so as to make them more conspicuous.

Further, in any one of the first to sixth aspects, the appearance inspection apparatus further includes an inner surface imaging device for imaging the inner surface of the inspection object transported by the transport device,
The inner surface imaging device is disposed above the glass plate at an inner surface imaging position set on the transport path of the inspection object, and measures the inner surface of the inspection object at the inner surface imaging position. an inner side imaging camera that captures an image;
Under the inner surface imaging camera, the inner surface imaging camera is arranged radially at equal intervals around a vertical axis passing through the center point of the inner surface imaging position, and the reflected light reflected from the inner surface of the inspection object is imaged. a plurality of prisms formed with optical paths leading to the camera;
An annular light projecting part is provided between the prism and the glass plate and coaxial with the vertical axis, and red light is emitted from the light projecting part toward the center. and an inner surface inspection red illumination unit that illuminates the inner surface of the inspection object located at the inner surface imaging position,
The determination device may further process the image captured by the inner surface imaging device to determine whether the appearance of the object to be inspected is good or bad.

The inner surface imaging device in this aspect (seventh aspect) is literally a device for imaging the inner surface of the annular resin product that is the object to be inspected. , 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, similarly to the above-described outer surface imaging device, red illumination light that is less likely to scatter reflected light is used as illumination light, and the light projecting units that irradiate the red light are arranged in an annular shape. , the inner surface of the annular test object is illuminated with red light. Further, a plurality of prisms formed with optical paths for guiding light reflected from the inner surface of the inspection object to the inner surface imaging camera are arranged radially about a vertical axis passing through the center point of the inner surface imaging position. placed at intervals.

Thus, according to this inner surface imaging device, as with the outer surface imaging device, since the inner surface, which is the inspection site, is illuminated with red light, a sufficient amount of reflected light is reflected by the inner surface. can be directed through the prism to the inner side view camera. Therefore, when there is a concave portion or a scratch on the inner surface of the inspection object, an image in which the concave portion or the scratch is emphasized is captured by the inner surface imaging camera. It is possible to determine with high accuracy whether or not there is a concave portion or a scratch on the inner surface.

Further, the inner surface imaging device according to the seventh aspect is further arranged above the inner surface imaging position and inside the prism, and directs red light downward to the inner surface imaging position. an upper highlighting illumination unit for the inner surface to be illuminated;
At the inner surface imaging position, an aspect may be adopted in which an inner surface lower emphasizing illumination unit is disposed below the glass plate and emits red light upward.

In this aspect (eighth aspect), the inner surface of the object to be inspected is obliquely illuminated by the inner surface upper emphasizing illumination unit and the inner surface lower emphasizing illumination unit, so that the inner surface is free from recesses and scratches. If they exist, they can be emphasized so as to make them more conspicuous.

As described above, according to the appearance 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 If burrs are present on the outer or inner peripheral surface, the surface imaging camera captures a color image in which the burrs are emphasized. 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 concave portions and flaws with illumination using white light. Even in the case of a product, the presence or absence of recesses and scratches can be detected with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS It is the top view which showed the schematic structure of the visual inspection apparatus which concerns on one Embodiment of this invention with the block diagram partially. 1 is a longitudinal sectional view showing main structures of a surface imaging device according to this embodiment; FIG. It is an explanatory view showing an image captured by the surface imaging device according to the present embodiment. FIG. 2 is a vertical cross-sectional view showing the main structure of the back imaging device according to the embodiment; FIG. 4 is an explanatory diagram showing an image captured by the back surface imaging device according to the embodiment; FIG. 2 is a vertical cross-sectional view showing the main structure of the outer surface imaging device according to this embodiment; It is an explanatory view showing an image captured by the outer surface imaging device according to the present embodiment. FIG. 2 is a vertical cross-sectional view showing the main structure of the inner side imaging device according to the present embodiment; It is an explanatory view showing an image captured by the inner surface imaging device according to the present 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 one embodiment of the present invention, partly in a block diagram.

As shown in FIG. 1, the visual inspection apparatus 1 of this example includes an operation mechanism section 5, a determination device 70, and a control device 80. The operation mechanism section 5 includes a transport device 10 for transporting an inspection object K, It comprises a front surface imaging device 20, a rear surface imaging device 30, an outer surface imaging device 40, an inner surface imaging device 50, a non-defective product recovery device 60, and a defective product recovery device 65, which are sequentially arranged along the transport direction of the transport device 10. be. Incidentally, the determination device 70 and the control device 80 are composed of a computer including a CPU, a RAM, a ROM, and the like.

[Conveyor]
The conveying device 10 is composed of a horizontally arranged transparent disc-shaped glass plate 11 and a drive motor 12 for horizontally rotating the glass plate 11. A feeding device (not shown) is provided on the upstream side. ) onto the glass plate 11 is conveyed in the rotation direction of the glass plate 11 . In this example, the objects to be inspected are circular resin molded products such as O-rings, gaskets, and packings.

[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 . The surface imaging camera 21 is disposed above a surface imaging position _P1 set on the transport path of the inspection object K, and is a color image of the surface of the inspection object K located at the surface imaging position _P1 . is imaged. The surface imaging camera 21 is a so-called color camera equipped with a 3-COMS image sensor.

The front-side blue illumination unit 22 is above the front-side imaging position _P1 , and is a first front-side blue illumination unit 23 disposed on the upper side between the front-side imaging camera 21 and the glass plate 11. , 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-projecting units 23b arranged in a ring coaxially with the imaging optical axis of the surface-imaging camera 21, and a cup with an open upper surface and a lower surface that supports the light-projecting units 23b. The light projecting part 23b is arranged on the bottom surface of the concave portion of the support 23a, and irradiates directional blue light toward the surface imaging position _P1 below.

The second surface-side blue illumination part 24 is a dome-shaped reflecting 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 serves as a diffuse reflection surface. a reflecting member 24a, a ring member 24b provided at the lower end of the reflecting member 24a, and an upper surface of the ring member 24b and annularly disposed within the reflecting member 24a. and a plurality of light projecting units 24c for irradiating blue light. The blue light emitted from the light projecting portion 24c is reflected by the diffuse reflection surface of the reflecting member 24a, and then emitted toward the surface imaging position _P1 as uniform light with no directivity.

The front-side red illumination section 25 is a ring-shaped support 25a disposed coaxially with the imaging optical axis of the front-surface imaging camera 21 between the second front-side blue illumination section 24 and the glass plate 11. , and a plurality of light projecting portions 25b that are annularly arranged on the inner peripheral surface of the support 25a and emit red light having directivity toward the center of the support 25a. The light emitted from the light projecting portion 25b mainly illuminates the outer peripheral surface and the inner peripheral surface of the inspection object K located at the front surface imaging position _P1 .

The front surface inspection green illumination unit 26 is arranged below the glass plate 11 at the front surface imaging position _P1 , and is arranged in a plane with many rows and columns. It is composed of a plurality of light projecting portions 26b for irradiating light, a cup-shaped support 26a with an open upper surface supporting the light projecting portions 26b, and a diffuser plate 26c closing the upper surface of the support 26a. The surface inspection green illumination unit 26 functions as a backlight that illuminates the inspection object K located at the surface imaging position _P1 from below with uniform light having no directivity to project the outline of the inspection object K. .

[Back imaging device]
As shown in FIG. 4, the back imaging device 30 has a configuration in which the front imaging device 20 is turned upside down. 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 _P2 set on the transport path of the inspection object K, and captures a color image of the back surface of the inspection object K located at the back surface imaging position _P2 . Take an image. Incidentally, this back imaging camera 31 is a so-called color camera equipped with a 3-COMS image sensor.

The rear-side blue illumination section 32 is a first rear-side blue illumination section arranged above the rear-surface imaging position _P2 and below between the rear-surface imaging camera 31 and the glass plate 11. 33, and a second rear-side blue illumination unit 34 disposed on the upper side. The first rear-side blue illumination unit 33 includes a plurality of light-projecting units 33b arranged in an annular shape coaxially with the imaging optical axis of the rear-surface imaging camera 31, and a cup having an open upper surface and a lower surface that supports the light-projecting units 33b. The light projecting part 33b is arranged on the bottom surface of the concave portion of the support 33a, and irradiates blue light having directivity toward the rear surface imaging position _P2 above.

In addition, the second back-side blue illumination part 34 is a reflection member having an inverted dome shape, which has an opening at the upper end and an opening at the lower end to which the support 33a is connected, and the inner surface of which is diffused. A reflecting member 34a serving as a reflecting surface, a ring member 34b provided at the upper end of the reflecting member 34a, and a lower surface of the ring member 34b, which is annularly disposed within the reflecting member 34a. It is composed of a plurality of light projecting portions 34c for irradiating blue light toward the inner surface of 34a. The blue light emitted from the light projecting portion 34c is reflected by the diffuse reflection surface of the reflecting member 34a, and then emitted toward the rear surface imaging position _P2 as uniform light with no directivity.

The back-side red illumination section 35 is a ring-shaped support 35a disposed coaxially with the imaging optical axis of the back-side imaging camera 31 between the second back-side blue illumination section 34 and the glass plate 11. , and a plurality of light projecting portions 35b which are annularly arranged on the inner peripheral surface of the support 35a and emit red light having directivity toward the center of the support 35a. The light emitted from the light projecting portion 35b mainly illuminates the outer peripheral surface and the inner peripheral surface on the back side of the inspection object K located at the back imaging position _P2 .

The back surface inspection green illumination unit 36 is arranged above the glass plate 11 at the front surface imaging position _P2 , and is arranged in a multi-row, multi-column planar shape. It is composed of a plurality of light projecting portions 36b for irradiating light, a cup-shaped support 36a with an open lower surface supporting the light projecting portions 36b, and a diffusion plate 36c closing the lower surface of the support 36a. The back surface inspection green illumination unit 36 functions as a backlight that illuminates the inspection object K located at the back surface imaging position _P2 with uniform light having no directivity from above to project the outline of the inspection object K. .

[Outside imaging device]
As shown in FIG. 6, the outer surface imaging device 40 includes an outer surface imaging camera 41, a light guide section 42, an outer surface inspection red illumination section 45, an outer upper side enhancement illumination section 46, and an outer lower side enhancement illumination section. It is configured with an illumination unit 47 .

The outer surface imaging camera 41 is disposed above the glass plate 11 at an outer surface imaging position _P3 set on the transport path of the inspection object K, and is located at the outer surface imaging position _P3 . An image of the outer surface of the inspection object K is captured. The outer surface imaging camera 41 may be a color camera like the front surface imaging camera 21 and the rear surface imaging camera 31, but since it takes a monochromatic image, it is a monochrome camera in terms of cost. is preferred.

The light guide section 42 is arranged below the outer surface imaging camera 41, and includes a disk-shaped transparent support plate 43 and six prisms 44 fixed to the lower surface of the support plate 43. Consists of The prisms 44 are arranged radially at regular intervals around a vertical axis passing through the center point of the outer surface imaging position _P3 , and are positioned radially outwardly of the support plate 43 and radially inwardly of the first prisms 44a. The outer inner surface of the first prism 44a and the inner inner surface of the second prism 44b are respectively reflecting surfaces. 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 by the outer inner surface, and enters the second prism 44b. Then, the light is reflected by the inner surface of the inner side thereof, and enters the outer side imaging camera 41 via the support plate 43 (see the chain double-dashed line shown in FIG. 6).

The outer surface inspection red illumination section 45 includes a ring-shaped support 45a arranged coaxially with the vertical axis between the light guide section 42 and the glass plate 11, and an inner side of the support 45a. A plurality of light projecting portions 45b are arranged on the peripheral surface in two stages, upper and lower, in a ring shape, and emit red light having directivity toward the center of the support 45a. The light emitted from the light projecting portion 45b mainly illuminates the outer and inner surfaces of the inspection object K located at the outer surface imaging position _P3 .

The outer surface upper emphasizing illumination unit 46 is disposed above the outer surface imaging position _P3 and inside the prism 44, and directs red light toward the outer surface imaging position _P3 below. It is composed of a plurality of light projecting parts 46b for irradiation, a cup-shaped support 46a with an open lower surface supporting the light projecting parts 46b, and a diffusion plate 46c closing the lower surface of the support 46a. The outer surface upper emphasizing illumination unit 46 illuminates the inspection object K located at the outer surface imaging position _P3 from above with uniform light having no directivity.

The outer surface lower highlighting illumination unit 47 is disposed below the glass plate 11 at the outer surface imaging position _P3 , and includes a plurality of light projecting units 47b that emit red light upward. It is composed of a cup-shaped support 47a with 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 lower highlighting illumination unit 47 illuminates the inspection object K located at the outer surface imaging position _P3 from below with uniform light having no directivity.

[Inside imaging device]
The inner surface imaging device 50 has a configuration in which the outer surface imaging device 40 is shifted upward, and as shown in FIG. 55 , an inner surface upper highlighting illumination unit 56 , and an inner surface lower highlighting illumination unit 57 .

The inner side imaging camera 51 is disposed above the glass plate 11 at an inner side imaging position _P4 set on the transport path of the inspection object K, and is located at the inner side imaging position _P4 . An image of the inner surface of the inspection object K is captured. The inner surface imaging camera 41 may be a color camera like the front surface imaging camera 21 and the rear surface imaging camera 31, but since it takes a monochromatic image, it is a monochrome camera due to cost considerations. is preferred.

The light guide section 52 is arranged below the inner surface imaging camera 51, and includes a disk-shaped transparent support plate 53 and six prisms 54 fixed to the lower surface of the support plate 53. Consists of The prisms 54 are radially arranged at regular intervals around a vertical axis passing through the center point of the inner surface imaging position _P4 , and are positioned radially outwardly of the support plate 53 and radially inwardly of the first prisms 54a. The outer inner surface of the first prism 54a and the inner inner surface of the second prism 54b are respectively reflecting surfaces. 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, and enters the second prism 54b. Then, the light is reflected by the inner surface of the inner surface, and enters the inner surface imaging camera 51 via the support plate 53 (see the chain double-dashed line shown in FIG. 8).

The inner surface inspection red illumination section 55 includes a ring-shaped support 55a arranged coaxially with the vertical axis between the light guide section 52 and the glass plate 11, and A plurality of light projecting portions 55b are arranged on the peripheral surface in two stages, upper and lower, in a ring shape, and emit red light having directivity toward the center of the support 55a. The light emitted from the light projecting portion 55b mainly illuminates the outer and inner surfaces of the inspection object K located at the inner surface imaging position _P4 .

The inner surface upper emphasizing illumination unit 56 is disposed above the inner surface imaging position _P4 and inside the prism 54, and directs red light toward the inner surface imaging position _P4 below. It is composed of a plurality of light projecting parts 56b for irradiation, a cup-shaped support 56a with an open lower surface supporting the light projecting parts 56b, and a diffusion plate 56c closing the lower surface of the support 56a. The inner surface upper highlighting illumination unit 56 illuminates the inspection object K located at the inner surface imaging position _P4 from above with uniform light having no directivity.

The inner surface lower highlighting illumination unit 57 is disposed below the glass plate 11 at the inner surface imaging position _P4 , and includes a plurality of light projecting units 57b that emit red light upward. It is composed of a cup-shaped support 57a with 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 side lower emphasizing illumination unit 57 illuminates the inspection object K located at the inner side imaging position _P4 from below with uniform light having no directivity.

[Non-defective product recovery device and defective product recovery device]
The non-defective product recovery device 60 and the defective product recovery device 65 each include a nozzle that discharges compressed air radially outward from the center of the glass plate 11, and a compressed air flow discharged from the nozzle that discharges the compressed air in the radial direction. A recovery box for recovering the inspection object K blown outward is provided. Under the control of the control device 80, the non-defective product recovery device 60 recovers the inspection objects K judged to be good products, and the defective product recovery device 65 recovers the inspection objects K judged to be defective products. .

[Determination device]
The determination device 70 processes each image captured by the front imaging device 20, the rear imaging device 30, the outer imaging device 40, and the inner imaging device 50, and for example, from the luminance level of the obtained image, Determining whether or not there is a concave portion or a flaw in the inspection object K, and determining whether or not there is a burr from the contour shape of the image. However, if there is any one of concave portions, scratches, and burrs, the product is determined to be defective. 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 conveying device 10 , the front surface imaging device 20 , the rear 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 recovery device 60 and the defective product recovery device 65 is controlled.

According to the appearance inspection apparatus 1 of this example having the above configuration, the appearance of the annular resin product, which is the inspection object K, is inspected in the following manner.

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

Then, images of the front surface, the back surface, the outer surface, and the inner surface of the inspection object K are captured by the front surface imaging device 20, the rear surface imaging device 30, the outer surface imaging device 40, and the inner surface imaging device 50. is sent to the determination device 70 .

Specifically, in the surface imaging device 20, at the surface imaging position _P1 , the inspection object K is illuminated by a front surface side blue illumination section 22 composed of a first surface side blue illumination section 23 and a second surface side blue illumination section 24. , the surface-side red illumination unit 25, and the surface inspection green illumination unit 26, the surface imaging camera 21 captures a color image of the surface.

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

Since blue light is easily scattered, the amount of light reflected from the inspection object K is small, and red light is difficult to scatter, so the amount of light reflected 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 from the outer peripheral surface and the inner peripheral surface on the front side. tend to be easily stolen.

Therefore, as described above, by irradiating the outer peripheral surface and the inner peripheral surface of the inspection object K where it is difficult to obtain the amount of reflected light with red light with low scattering, the recesses existing on the outer peripheral surface and the inner peripheral surface Also, an appropriate amount of reflected light that can detect scratches can be guided to the surface imaging camera 21 . In addition, by irradiating highly scattering blue light on surfaces other than the outer peripheral surface and the inner peripheral surface of the inspection object K, where the amount of reflected light is easy to obtain, concave portions and flaws existing on the surface can be detected. An appropriate amount of reflected light can be guided to the surface imaging camera 21 . In addition, by illuminating green light other than blue and red as a backlight, the outline of the inspection object K can be projected, and if there are burrs on the outer peripheral surface and the inner peripheral surface of the inspection object K, , the shape of this burr is projected as the contour of the object K to be inspected.

Thus, in this 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 is obtained, and the outer peripheral surface of the inspection object K is obtained. And when burrs are present on the inner peripheral surface, an image in which the burrs are emphasized is obtained. Based on such an image, the judgment device 70 judges whether or not there is a defect such as a concave portion, a scratch, or a burr on the surface of the inspection object K. Therefore, the judgment can be performed with high accuracy. can.

In the rear surface imaging device 30, similarly to the front surface imaging device 20, at the rear surface imaging position _P2 , the inspection object K is a rear surface composed of a first rear surface side blue illumination section 33 and a second rear surface side blue illumination section . The rear surface imaging camera 31 captures a color image of the rear surface under illumination by the side blue illumination unit 32 , the rear surface side red illumination unit 35 , and the rear surface inspection green illumination unit 36 .

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

As described above, by irradiating the outer peripheral surface and the inner peripheral surface of the inspection object K from which it is difficult to obtain the amount of reflected light with red light with low scattering, recesses and scratches existing on the outer peripheral surface and the inner peripheral surface can be removed. can be guided to the rear-surface imaging camera 31 with an appropriate amount of reflected light that can detect . In addition, by irradiating highly scattering blue light on the back surface of the inspection object K other than the outer peripheral surface and the inner peripheral surface, where the amount of reflected light is easily obtained, concave portions and scratches existing on the back surface can be detected. An appropriate amount of reflected light can be guided to the back imaging camera 31 . In addition, by illuminating green light other than blue and red as a backlight, the outline of the inspection object K can be projected, and if there are burrs on the outer peripheral surface and the inner peripheral surface of the inspection object K, , the shape of this burr is projected as the contour of the object to be inspected.

Thus, in this 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 is obtained. Based on such an image, the determination device 70 determines whether or not there is a defect such as a concave portion, a scratch, or a burr on the back surface of the inspection object K. Therefore, the determination can be performed with high accuracy. can.

In the outer surface imaging device 40, the outer surface and the inner surface of the inspection object K are irradiated with directional red light from the outer surface inspection red illumination unit 45 at the outer surface imaging position _P3 . , the homogeneous red light diffused from the outer surface upper emphasizing illumination unit 46 is irradiated onto the upper outer surface and the inner surface of the inspection object K, and the outer surface lower emphasizing illumination unit 47 similarly emits red light. Diffused, homogeneous red light illuminates the lower outer and inner surfaces of the object K to be inspected.

Reflected light reflected from the outer surface of the inspection object K illuminated as described above enters 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.

Since the outer surface of the inspection object K is a side surface close to the glass plate 11, the image of the outer surface imaging camera 41 cannot be directly captured. An image of the lateral surface can be captured. Further, it is difficult to illuminate the outer surface of the inspection object K with a sufficient amount of 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 obliquely illuminating the outer surface of the inspection object K with the outer upper red illumination unit 46 and the outer lower red illumination unit 47, if there is a concave portion or a scratch on the outer surface, It is possible to emphasize so that the concave portion and the scratch are more conspicuous.

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

Further, in the inner surface imaging device 50, the outer surface and the inner surface of the inspection object K are irradiated with directional red light from the inner surface inspection red illumination unit 55 at the inner surface imaging position _P4 , The homogeneous red light diffused from the inner surface upper emphasizing illumination unit 56 is irradiated onto the upper outer surface and the inner surface of the inspection object K, and is also diffused from the inner surface lower emphasizing illumination unit 57. A homogeneous red light is irradiated onto the lower outer surface and inner surface of the inspection object K. As shown in FIG.

Reflected light reflected from the inner surface of the inspection object K illuminated as described above enters the inner surface imaging camera 51 through the first prism 54a, the second prism 54b, and the support plate 53. , a monochrome image as shown in FIG.

Since the inner side surface of the inspection object K is a side surface close to the glass plate 11, the image thereof cannot be directly captured by the inner side imaging camera 51. An image of the medial surface can be captured. Further, it is difficult to illuminate the inner surface of the inspection object K with a sufficient amount of 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, by obliquely illuminating the outer surface of the inspection object K with the inner upper red illumination unit 56 and the inner lower red illumination unit 57, if there is a concave portion or a scratch on the outer surface, It is possible to emphasize so that the concave portion and the scratch are more conspicuous.

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

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

As described in detail above, according to the visual inspection apparatus 1 of this example, defects such as recesses, scratches, and burrs exist 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. If so, it can be detected and separated with high accuracy. In particular, in the case of a dark-colored or black resin molded product, it is difficult to detect concave portions and flaws with white light illumination. 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, specific modes that the present invention can take are not limited to the above examples.

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

REFERENCE SIGNS LIST 1 appearance inspection device 10 conveying device 20 surface imaging device 21 surface imaging camera 22 surface-side blue illumination unit 23 first surface-side blue illumination unit 24 second surface-side blue illumination unit 25 front-side red illumination unit 26 green illumination unit for surface inspection 30 back side imaging device 31 back side imaging camera 32 back side blue illumination section 33 first back side blue illumination section 34 second back side blue illumination section 35 back side red illumination section 36 back side inspection green illumination section 40 outer side imaging device 41 outside Side imaging camera 42 Light guide section 45 Outer surface inspection red illumination section 46 Outer surface upper enhancement illumination section 47 Outer surface lower enhancement illumination section 50 Inner surface imaging device 51 Inner surface imaging camera 52 Light guide section 55 Inner surface inspection red lighting unit 56 upper highlighting lighting unit for inner surface 57 lower highlighting lighting unit for inner surface 60 non-defective product recovery device 65 defective product recovery device 70 determination device 80 control device

Claims (7)

An appearance inspection device for inspecting the appearance of a circular resin product as an inspection object,
A conveying device comprising a horizontally arranged transparent disk-shaped glass plate, horizontally rotating the glass plate, and conveying the inspection object supplied on the glass plate in the rotating direction of the glass plate. and,
a surface imaging device for imaging the surface of the inspection object transported by the transport device;
a back surface imaging device that captures an image of the back surface of the inspection object transported by the transport device;
a determination device that processes the images captured by the front surface imaging device and the back surface imaging device and determines whether the appearance of the inspection object is good or bad,
The surface imaging device is disposed above a surface imaging position set on the transport path of the inspection object, and captures a color image of the surface of the inspection object located at the surface imaging position. camera and
A front-side blue illumination unit disposed above the front-surface imaging position and between the front-surface imaging camera and the glass plate for irradiating the surface of the inspection object at the front-surface imaging position with blue light. and,
An annular light projecting part is provided between the front-side blue illumination part and the glass plate and coaxial with the imaging optical axis of the surface imaging camera, and a red light is emitted from the light projecting part. a surface-side red illumination unit that irradiates light toward the center to illuminate the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object located at the surface imaging position;
A surface inspection green illumination unit disposed below the glass plate at the surface imaging position and emitting green light upward ,
The back surface imaging device is disposed below the glass plate at a 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. a backside imaging camera that
A rear-side blue illumination unit disposed below the rear-surface imaging position and between the rear-surface imaging camera and the glass plate for irradiating the rear surface of the inspection object at the rear-surface imaging position with blue light. and,
An annular light projecting part is provided between the rear-side blue illumination part and the glass plate and is arranged coaxially with the imaging optical axis of the back imaging camera, and a red light is emitted from the light projecting part. a back-side red illumination unit that irradiates light toward the center to illuminate the outer peripheral surface and the inner peripheral surface on the back side of the inspection object located at the back-side imaging position;
An appearance inspection apparatus, comprising: a rear surface inspection green illumination unit disposed above the glass plate at the rear surface imaging position and emitting green light downward. The back-side blue illumination unit is composed of a first back-side blue illumination unit arranged on the lower side and a second back-side blue illumination unit arranged on the upper side,
The first rear-side blue illumination section has an annular light-projecting section arranged coaxially with the imaging optical axis of the rear-surface imaging camera, and emits blue light from the light-projecting section toward the rear-surface imaging position above. configured to emit light;
The second back-side blue illumination unit is a dome-shaped reflecting member having an opening at its upper end and an opening at its lower end through which the light emitted from the light-projecting unit of the first back-side blue illumination unit passes. a reflecting member having an inner surface serving as a diffuse reflection surface; and an annular light projecting portion disposed at the lower edge of the reflecting member and emitting blue light toward the inner surface of the reflecting member, 2. The visual inspection apparatus according to claim 1 , wherein the light projected from the light projecting section and reflected by the diffuse reflection surface is directed toward the rear surface imaging position. An appearance inspection device for inspecting the appearance of a circular resin product as an inspection object,
A conveying device comprising a horizontally arranged transparent disk-shaped glass plate, horizontally rotating the glass plate, and conveying the inspection object supplied on the glass plate in the rotating direction of the glass plate. and,
a surface imaging device for imaging the surface of the inspection object transported by the transport device;
an outer surface imaging device for imaging the outer surface of the inspection object conveyed by the conveying device ;
a determination device that processes the images captured by the surface imaging device and the outer side imaging device and determines whether the appearance of the inspection object is good or bad,
The surface imaging device is disposed above a surface imaging position set on the transport path of the inspection object, and captures a color image of the surface of the inspection object located at the surface imaging position. camera and
A front-side blue illumination unit disposed above the front-surface imaging position and between the front-surface imaging camera and the glass plate for irradiating the surface of the inspection object at the front-surface imaging position with blue light. and,
An annular light projecting part is provided between the front-side blue illumination part and the glass plate and coaxial with the imaging optical axis of the surface imaging camera, and a red light is emitted from the light projecting part. a surface-side red illumination unit that irradiates light toward the center to illuminate the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object located at the surface imaging position;
A surface inspection green illumination unit disposed below the glass plate at the surface imaging position and emitting green light upward,
The outer surface imaging device is disposed above the glass plate at an outer surface imaging position set on the transport path of the inspection object, and measures the outer surface of the inspection object at the outer surface imaging position. an outer surface imaging camera that captures an image;
below the outer surface imaging camera, arranged radially at equal intervals around a vertical axis passing through the center point of the outer surface imaging position, and capturing the reflected light reflected from the outer surface of the inspection object; a plurality of prisms formed with optical paths leading to the camera;
An annular light projecting part is provided between the prism and the glass plate and coaxial with the vertical axis, and red light is emitted from the light projecting part toward the center. and an outside surface inspection red illumination unit that mainly illuminates the outside surface of the object to be inspected located at the outside surface imaging position. The outer side imaging device is further arranged above the outer side imaging position and inside the prism, and emits red light downward to the outer side imaging position. a lighting unit;
4. The apparatus according to claim 3 , further comprising: an outer side lower emphasizing illumination section disposed below the glass plate at the outer side imaging position and emitting red light upward. Appearance inspection device. An appearance inspection device for inspecting the appearance of a circular resin product as an inspection object,
A conveying device comprising a horizontally arranged transparent disk-shaped glass plate, horizontally rotating the glass plate, and conveying the inspection object supplied on the glass plate in the rotating direction of the glass plate. and,
a surface imaging device for imaging the surface of the inspection object transported by the transport device;
an inner surface imaging device for imaging the inner surface of the inspection object conveyed by the conveying device ;
a determination device that processes the images captured by the surface imaging device and the inner side imaging device and determines whether the appearance of the inspection object is good or bad,
The surface imaging device is disposed above a surface imaging position set on the transport path of the inspection object, and captures a color image of the surface of the inspection object located at the surface imaging position. camera and
A front-side blue illumination unit disposed above the front-surface imaging position and between the front-surface imaging camera and the glass plate for irradiating the surface of the inspection object at the front-surface imaging position with blue light. and,
An annular light projecting part is provided between the front-side blue illumination part and the glass plate and coaxial with the imaging optical axis of the surface imaging camera, and a red light is emitted from the light projecting part. a surface-side red illumination unit that irradiates light toward the center to illuminate the outer peripheral surface and the inner peripheral surface on the surface side of the inspection object located at the surface imaging position;
A surface inspection green illumination unit disposed below the glass plate at the surface imaging position and emitting green light upward,
The inner surface imaging device is disposed above the glass plate at an inner surface imaging position set on the transport path of the inspection object, and measures the inner surface of the inspection object at the inner surface imaging position. an inner side imaging camera that captures an image;
Under the inner surface imaging camera, the inner surface imaging camera is arranged radially at equal intervals around a vertical axis passing through the center point of the inner surface imaging position, and the reflected light reflected from the inner surface of the inspection object is imaged. a plurality of prisms formed with optical paths leading to the camera;
An annular light projecting part is provided between the prism and the glass plate and coaxial with the vertical axis, and red light is emitted from the light projecting part toward the center. and an inner surface inspection red illumination unit for illuminating the inner surface of the inspection object located at the inner surface imaging position. The inner surface imaging device is further arranged above the inner surface imaging position and inside the prism, and emits red light downward to the inner surface imaging position. a lighting unit;
6. The apparatus according to claim 5 , further comprising: an inner side lower emphasizing illumination section disposed below the glass plate at the inner side imaging position and emitting red light upward. Appearance inspection device. The surface-side blue illumination unit comprises 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 projecting unit arranged coaxially with the imaging optical axis of the surface imaging camera, and emits blue light from the light projecting unit toward the surface imaging position below. configured to emit light;
The second surface-side blue illumination unit is a dome-shaped reflecting member having an opening at the lower end and an opening at the upper end through which the light emitted from the light-projecting unit of the first surface-side blue illumination unit passes. a reflecting member having an inner surface serving as a diffuse reflection surface; and an annular light projecting portion disposed at the lower edge of the reflecting member and emitting blue light toward the inner surface of the reflecting member, 7. The apparatus according to any one of claims 1 to 6, wherein the light emitted from the light projecting unit and reflected by the diffuse reflection surface is emitted toward the front surface imaging position. Appearance inspection equipment.

Images