JP7256567B1 - Seaweed foreign matter detection device - Google Patents

Abstract

[Problem] To easily identify the position of a foreign substance by suppressing the influence of reflected light on a shiny part of the surface of the dry seaweed when removing the foreign substance on the surface of the dry seaweed while directly observing the foreign substance, and to make it easier to identify the position of the foreign substance contained inside the dried seaweed. To specify the position of a foreign substance found in seaweed while looking at the display on the same laver foreign substance confirming device so as to be able to work continuously. SOLUTION: A lower housing 3 having a mounting plate 13 containing a near-infrared light source 11 and capable of placing dried seaweed 12 thereon, a visible light source 15 and a camera 16 containing a first polarizing plate 17 and a camera polarizing plate 18. and a second polarizing plate 20, two posts 5 extending upward from the lower housing 3, an upper horizontal beam 6 and a middle horizontal beam 7 connecting the upper end portion and the middle step portion of the support 5, and the support 5 A seaweed foreign substance checking device comprising a cantilever beam 8 extending from the middle stage to the front side, and a side light shielding plate and a rear light shielding plate blocking both side and back parts of the working space. . [Selection drawing] Fig. 3

Description

The present invention identifies the presence or absence and position of foreign matter adhering to the surface of dry seaweed (includes plate seaweed before treatment and seasoned seaweed and baked seaweed after treatment) or foreign matter mixed inside, The present invention relates to a seaweed foreign matter checking device for removing such foreign matter.

As a prior art of a seaweed foreign matter identification device used when manufacturing dried seaweed, there is a seaweed foreign matter identifier described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-350668).
This seaweed foreign matter identifier irradiates the seaweed (1) with visible light and infrared light from the upper projector (7) and the lower projector (20), respectively. Light and reflected light reflected on the surface of seaweed (1) are photographed, the photographed image signal is output to the signal processing circuit (16), and the image signal is output to the liquid crystal display (13) (see paragraph 0034, etc.) .
Then, when the seaweed (1) does not contain foreign matter, the image of the seaweed (1) is displayed with substantially uniform brightness, and when the foreign matter (1a) such as pebbles is included, infrared irradiation On the screen where the image is taken, the part where the foreign matter (1a) exists is displayed in black, and if the seaweed (1) contains foreign matter (1b), which is waste such as synthetic resin netting, visible light irradiation In the imaged screen, the site where the foreign object (1b) exists is displayed in white (see paragraph 0035, FIG. 7, etc.).
Therefore, the worker can identify the presence of foreign matter by looking at the display screen of the liquid crystal display (13), and the presence or absence of the foreign matter (1b) adhering to the lower surface (back surface) of the seaweed (1) can be determined by the operator. The seaweed (1) can be inspected by turning it over (see paragraph 0035, etc.).

In addition, although it is not a device for removing foreign substances adhering to the surface of dried seaweed or foreign substances mixed inside, the correct When identifying whether the seaweed (1) is a good product or a defective product, the identification device for the reflective part and the diffused reflection part detects foreign matter by simply comparing the transmitted light and the reflected light, and detects foreign matter in the glossy part of the seaweed surface. This is to prevent erroneous detection caused by reflection of measurement light.
This identification device is placed above the intermediate part of the upstream conveyors (2a) and (3a) of the two belt conveyors (2) and (3) on which the seaweed (1) is placed and conveyed. comprising a first camera (5) for detecting rays reflected from a surface, a lens filter (6) and a second polarizing filter (PF2) mounted on the first camera (5), the first camera (5) Above the belt conveyors (2) and (3) at an obliquely lower upstream side, a first halogen lamp (7) or the like is provided as a first exposure means for injecting the measurement light beam, and the first halogen lamp (7) Horizontally downstream, a reflecting mirror (9), a cylindrical lens (10) and a first polarizing filter ( PF1) (see page 3, lower right column, line 11 to page 4, upper right column, line 1 and bottom of FIG. 1).
Since the polarization direction of the second polarizing filter (PF2) is orthogonal to that of the first polarizing filter (PF1), the reflected light from the glossy part of the surface of the seaweed (1) is cut, and only the reflected light from the foreign matter is emitted. Detected by one camera (5), erroneous detection can be prevented (see page 5, upper right column, lines 2 to 7).
Furthermore, this identification device displays a permeation pattern of seaweed (1) above the transparent plate (4) provided at the division between the upstream conveyors (2a) (3a) and the downstream conveyors (2b) (3b). Equipped with a second camera (11) and the like as reading means, a second halogen lamp ( 13), etc., and directly below the transparent plate (4) on the horizontal downstream side of the second halogen lamp (13). A reflecting mirror (15) and a cylindrical lens (16) are provided for convergence (see page 4, upper right column, line 14 to lower left column, line 11 and the upper side of FIG. 1).

However, the seaweed foreign matter identifier described in Patent Document 1 allows the operator to detect the presence of foreign matter (1a) (1b) contained in the seaweed (1) while looking at the display screen of the liquid crystal display (13). After identifying, the foreign substances (1a) and (1b) are removed. Therefore, even if the foreign matter (1b) adheres to the surface of the seaweed (1), the task of removing the foreign matter (1b) after identifying the presence of the foreign matter (1b) by looking at the display screen of the liquid crystal display (13) There is a problem that it takes time.
In addition, similar to the problem of false detection caused by the reflection of the measurement light on the glossy part of the seaweed surface described in Patent Document 2, the foreign matter (1b) appears to exist on the display screen. There was also the problem that there was a case where it did not actually exist even though it existed.

JP-A-2004-350668 JP-A-3-221850

The present invention solves the above-mentioned problems, and provides a seaweed foreign substance checking device that enables the operator to identify the presence of foreign substances adhering to the surface of dried seaweed while directly observing the foreign substances, and to remove the foreign substances. This is the first issue.
In addition, while solving the first problem, the second problem is to make it possible to identify the presence of foreign matter without being affected by the reflected light on the glossy part of the dry seaweed surface.
Furthermore, in the same laver foreign matter detection device, the position of foreign matter contained in the dried laver can be identified simply by extinguishing visible light and irradiating near-infrared light and displaying the image of the dried laver taken by the camera on the display. The third issue is to make it possible to work continuously.

The invention according to claim 1 is a seaweed foreign matter confirmation device that can identify the presence of foreign matter adhering to the surface of dry laver while directly viewing it and remove the foreign matter,
a placing plate for placing dried seaweed;
A first polarizing plate is provided above the mounting plate and incorporates a visible light source for irradiating the mounting plate with visible light, and converts the visible light into linearly polarized light on the lower surface side. a rectangular parallelepiped upper housing ;
The linearly polarized light specularly reflected on the surface of the dried seaweed placed on the placing plate is not transmitted, and the linearly polarized light is reflected on the surface of the dried seaweed. a second polarizing plate that passes the diffusely reflected diffusely reflected light ;
a side light shielding plate that closes both side portions of a work space between the mounting plate and the upper housing;
A back light shielding plate that closes the back part of the work space is provided ,
A line segment connecting a point on the surface of the dried seaweed placed on the placing plate and a point on the visible light source closest to the point is defined as a light source line segment, and the point and the point at the lower end of the second polarizing plate. When a line segment connecting a point closest to is defined as a bottom line segment, the angle formed by the light source line segment and the bottom line segment is 55 degrees or more and 75 degrees or less.

The invention according to claim 2 is the laver foreign matter confirmation device according to claim 1 of the present application,
a near-infrared light source provided below the mounting plate for irradiating the mounting plate with near-infrared light;
a camera provided above the placing plate for photographing the dried seaweed placed on the placing plate;
It is characterized by comprising a display for displaying an image taken by the camera.

The apparatus for checking foreign matter in seaweed according to the first aspect of the invention is provided above the placing plate, incorporates a visible light source for irradiating visible light onto the placing plate, and converts the visible light into linearly polarized light on the lower surface side. A rectangular parallelepiped upper housing in which the first polarizing plate is provided, and a regular reflection that is provided at the lower part of the front side of the upper housing, and the linearly polarized light is specularly reflected on the surface of the dried seaweed placed on the placing plate Since it is equipped with a second polarizing plate that does not allow light to pass through but passes through the diffusely reflected light that is linearly polarized and diffusely reflected on the surface of the dried laver, the presence of foreign matter adhering to the surface of the dried laver can be identified by directly visual observation. In addition, the foreign matter can be removed and the presence of the foreign matter can be identified without being affected by the specularly reflected light on the glossy portion of the dry seaweed surface.
In addition, the second polarizing plate is a plate-like body installed at the lower part of the front side of the upper housing, and the point closest to the point on the surface of the dried seaweed placed on the placing plate and the point on the visible light source and the line segment connecting one point and the point closest to the point on the lower end of the second polarizing plate is the bottom line segment, the angle formed by the light source line segment and the bottom line segment is 55 Since the angle is 75 degrees or less, the entire surface of the dried seaweed placed on the placing plate can be visually observed under the condition that the reflectance of the specularly reflected light is small and the reflectance of the diffusely reflected light is large.

According to the invention according to claim 2 , in addition to the effect of the apparatus for checking foreign matter in seaweed according to the invention according to claim 1 , a near-infrared light is provided below the placing plate and irradiates the placing plate with near-infrared light. Since it is equipped with an infrared light source, a camera that is provided above the placing plate and photographs the dried laver placed on the placing plate, and a display that displays the image taken by the camera, By extinguishing visible light and irradiating near-infrared light, the image of dried seaweed taken by the camera is displayed on the display, and the position of the foreign matter contained inside the dried seaweed is identified and continuously removed. work can be done.

FIG. 2 is a front side perspective view of the body of the seaweed foreign matter checking device according to the embodiment. FIG. 2 is a side perspective view of the main body of the nori foreign matter checking device according to the embodiment. FIG. 2 is a cross-sectional view of the main body of the nori foreign matter checking device and a front view of the display according to the embodiment. A diagram for explaining the principle of displaying foreign substances contained in dried seaweed. FIG. 10 is a diagram for explaining the principle that using two polarizing plates makes it easier to see foreign matter on the surface of dried seaweed. FIG. 2 is a cross-sectional view of a dried seaweed that is directly visually observed by the seaweed foreign matter confirmation device according to the embodiment. The figure and graph which explain the angle which is easy to see the foreign substance on the surface of the dry seaweed.

The embodiments of the present invention will now be described with reference to examples.

FIG. 1 is a front side perspective view of a laver foreign matter checking device main body 1 according to an embodiment, FIG. 2 is a side perspective view of the laver foreign matter checking device main body 1 according to an embodiment, and FIG. 1 is a cross-sectional view of the main body 1 of the laver foreign matter checking apparatus and a front view of the display 2 according to FIG.
As shown in FIGS. 1 and 2, the body 1 of the seaweed foreign matter checking device includes a lower housing 3, an upper housing 4, two posts 5 fixed to the rear side of the lower housing 3 and extending upward, An upper horizontal beam 6 connecting the upper ends of the pillars 5, a middle horizontal beam 7 connecting the middle parts of the two pillars 5, a cantilever 8 extending from the middle parts of the two pillars 5 toward the front side, and a lower housing. 3 and the upper housing 4, and a rear light shielding plate (not shown) for blocking both side portions of the work space and a rear light shielding plate (not shown) for blocking the rear portion of the work space.
The lower housing 3 incorporates a near-infrared light source 11 that is composed of a large number of LEDs 10 and emits near-infrared light upward. A placement plate 13 is provided. In addition, the upper housing 4 is composed of an annular LED round illuminator 14, and a visible light source 15 that emits visible light downward, and a light source that responds to at least the wavelength range from near-infrared light to visible light. A first annular polarizing plate 17 has a built-in camera 16 for photographing light rays transmitted through or reflected by the dried laver 12 on the plate 13, and converts visible light irradiated from a visible light source 15 to linearly polarized light on the lower surface side. A detachable camera polarizing plate 18 is provided below the camera 16 .
Furthermore, a second polarizing plate 20 whose upper end is supported by two hinges 19 and whose entirety can be rotated about 180 degrees and which can be stopped at an arbitrary position is provided at the lower part of the front side of the upper housing 4 . .
The camera polarizing plate 18 and the second polarizing plate 20 are provided so as not to pass the linearly polarized regularly reflected light converted by the first polarizing plate 17 but to pass the diffusely reflected light.

In FIG. 3, the near-infrared light source 11 is turned on, the visible light source 15 is turned off, the camera 16 is switched on, and near-infrared light is emitted upward while the near-infrared light is transmitted through the dried seaweed 12 on the mounting plate 13. A state in which a camera-acquired image obtained by photographing infrared light with the camera 16 (transmissive image of the dry seaweed 12) is displayed on the display 2, or the near-infrared light source 11 is turned off, the visible light source 15 is turned on, and the switch of the camera 16 is turned on, and visible light reflected by the dried laver 12 on the placing plate 13 is photographed by the camera 16, and a camera-obtained image (a reflected image of the dried laver 12) is displayed on the display 2 while irradiating the visible light downward. state.
In the former case, the camera polarizing plate 18 is removed, and in the latter case, it is attached.
4A and 4B are diagrams for explaining the principle by which foreign substances such as metals contained in the dry laver 12 can be displayed by the transparent image of the dry laver 12. FIG.
As shown in FIG. 4, near-infrared light emitted upward from a large number of LEDs 10 constituting the near-infrared light source 11 passes through the dried seaweed 12. Since these foreign substances do not transmit near-infrared light, the transmitted image of the dry seaweed 12 is such that images of foreign substances with low brightness are interspersed in areas with high brightness. Conversely, if the dried seaweed 12 does not contain any foreign matter, the image of the dried seaweed 12 will have a high brightness over the entire surface.
Therefore, by confirming the image of the dried laver 12 displayed on the display 2, the operator can confirm whether or not the foreign matter is contained in the dried laver 12, and when it is confirmed that the foreign matter is contained, the position of the foreign matter is can be performed to remove the foreign matter from the dry seaweed 12.
Then, the image of the dried laver 12 on the back side as seen from the operator is on the upper side of the display 2, the image of the dried laver 12 on the front side is on the lower side of the display 2, and the image of the dried laver 12 on the left side is on the left side and the right side of the display 2. By displaying the image of the dried seaweed 12 on the right side of the display 2, the correspondence relationship between the position on the display 2 where the image of the foreign substance is displayed and the position where the foreign substance exists in the dried seaweed 12 on the placing plate 13 can be understood. Since it becomes easy, work efficiency can be improved.

FIG. 5 is a diagram for explaining the principle that using two polarizing plates makes it easier to see foreign substances on the surface of dried seaweed. FIG. 5(A) illustrates how the light emitted from the LED round illuminator 14 is reflected by the surface of the dried laver and foreign matter on the surface of the dried laver, and FIG. The figure illustrates how the light reflected by the foreign matter on the surface is photographed by the camera 16 .
As shown in FIG. 5A, the visible light emitted downward from the LED round illuminator 14 that constitutes the visible light source 15 passes through the first polarizing plate 17 on the lower surface side of the upper housing 4 and becomes a straight line. converted to polarized light. When the linearly polarized light is reflected by the glossy part (flat surface) of the dry seaweed 12, it becomes specularly reflected light (arrow on the right) while maintaining the linearly polarized light. When reflected, the linearly polarized light is not maintained and becomes non-polarized diffusely reflected light (arrow on the left).
Next, as shown in FIG. 5(B), specularly reflected light and diffusely reflected light reflected by the surface of the dry seaweed 12 are cut by the camera polarizing plate 18 installed below the camera 16. Therefore, only the diffusely reflected light is captured by camera 16 .
By the way, since there are many glossy parts on the surface of the dry seaweed 12, if visible light is irradiated as it is and the light reflected on the surface of the dry seaweed 12 is photographed with a camera and displayed or visually observed, Since many shining parts are displayed or visually recognized, the part where the foreign matter is attached is buried and it is not easy to recognize it.
However, if two polarizing plates are used, as described above, only the diffusely reflected light reflected by the part where the foreign matter is attached can be photographed. This makes it easier to observe the foreign matter on the surface of the dry seaweed 12 .

FIG. 6 is a cross-sectional view when the dried seaweed 12 is directly visually observed by the device for checking foreign matter in seaweed according to the embodiment. It shows a state in which the camera 16 is switched off and the work is performed visually.
As shown in FIG. 6, when visible light is emitted downward and the work is performed visually, the upper housing 4 is slid to the front side. Therefore, as shown in FIGS. 1 and 2, the length of the cantilever beam 8 is longer than the length of the side wall of the upper housing 4, and the upper surface of the cantilever beam 8 is provided with grooves 21 in the longitudinal direction.
A ridge (not shown) that fits into the groove 21 is provided on the lower side of the side wall of the upper housing 4 so that the upper housing 4 can be slid forward and backward.
The reason for such a structure is that the position where the dried seaweed 12 is placed is set further back (rear side) from the front side of the body 1 of the apparatus for checking foreign substances in seaweed, so that the light enters the work space from above the front side. This is because disturbance light can be suppressed, and specularly reflected light can be suppressed from entering the eye without using the second polarizing plate 20 for the reason described below.

FIG. 7 is a diagram and graph for explaining the angle at which the foreign matter adhering to the surface of the dry seaweed 12 is easily visible in the state of FIG.
FIG. 7(A) is a diagram showing visual observation angles, one point P on the surface of the dried seaweed 12 placed on the placing plate 13 and the point Q closest to the point P on the visible light source 15 (usually one point P ) is the light source line segment, and the line segment PE connecting the point P and the operator's eye E is the line segment. Let the observation angle be θ.
With the visible light source 15 turned on, the position of the operator's eye E was changed to verify the visual observation angle θ at which observation is easy, and it was found that θ=55.8 degrees was optimal.
This result is considered to be caused by the fact that the reflectances of p-wave and s-wave are different depending on the incident angle. That is, as shown in FIG. 7B, when a p-wave is incident from the air (refractive index 1) into a substance with a refractive index of 1.76, which is close to the refractive index of the dry seaweed 12, the incident angle is about 60 degrees (Brew It seems to be related to the fact that the reflectance becomes 0 at the star angle).
In this way, if the operator observes the front side of the main body 1 of the laver foreign matter checking device so that the visual observation angle θ is 50 to 70 degrees where the reflectance of the p-wave is small, the second polarized light Since specularly reflected light can be prevented from entering the eye without using the plate 20, the light reflected by the foreign matter can be easily observed.

Returning to FIG. 6, the relationship between the light source line segment and the position of the operator's eyes will be examined.
The position of the operator's eyes can be changed as appropriate, but if it is too low, the work will be difficult, so the lower end of the second polarizing plate 20 is assumed. Then, θ increases monotonically as the light source line moves from the end (front end) of the dry seaweed 12 on the worker side to the bottom of the visible light source 15 on the rearmost side. It monotonously decreases as it moves to the far end (rear end).
Therefore, when a line segment connecting a point P on the surface of the dried seaweed 12 and a point closest to the point P on the bottom end of the second polarizing plate 20 is defined as a bottom line segment, the following conditions (1) to (3) are satisfied. If satisfied, the position of the operator's eyes during actual work is slightly above the lower end of the second polarizing plate 20, so θ should be within the range of 50 to 70 degrees on the entire surface of the dried seaweed 12. can be done.
(1) At the front end of the dry seaweed 12, the angle α formed by the light source line segment and the bottom line segment is 55 to 65 degrees.
(2) The angle β formed by the light source line segment and the bottom line segment on the far side of the dried seaweed 12 (immediately below the rearmost side of the visible light source 15) is 65 to 75 degrees.
(3) At the trailing edge of the dry seaweed 12, the angle γ formed by the light source line segment and the bottom edge line segment is 55 to 65 degrees.

Modifications of the seaweed foreign matter checking device of the embodiment are listed.
(1) The near-infrared light source 11 of the embodiment is composed of a large number of LEDs 10, but a surface light emitter, a linear light emitter, or the like may be used as long as the light source has a function of irradiating near-infrared light upward. .
(2) Although the visible light source 15 of the embodiment was made up of the annular LED round illuminator 14, any light source having a function of downwardly irradiating visible light, such as a surface light emitter or a linear light emitter, may be used. But it's okay.
(3) The camera 16 of the embodiment is sensitive to at least light rays in the wavelength range from near-infrared light to visible light. , may not be sensitive to visible light. In such a case, the detachable camera polarizing plate 18 may not be provided below the camera 16 .

(4) Although the first polarizing plate 17 in the embodiment was permanently installed on the bottom surface of the upper housing 4, it may be detachable so that observation can be made without using polarized light. Also, a variable polarizing plate capable of controlling polarization may be used.
(5) The second polarizing plate 20 in the embodiment is permanently installed at the lower part of the front side of the upper housing 4, but it may be detachable, and the operator may wear polarizing glasses. In addition, although the second polarizing plate 20 can rotate about 180 degrees, the range of rotation may be limited to the use range (the angle of about 30 degrees to 150 degrees with respect to the front surface of the upper housing 4). If you always use it, you can fix it.

(6) In the embodiment, the side light shielding plate 9 that blocks both sides of the working space and the back light shielding plate that blocks the back part are provided. A light shielding part may be provided to cover the gap formed on the rear side when the main body 1 of the apparatus for checking foreign matter is positioned at the frontmost side. For example, the lower end of the middle crossbar 7 and the back of the device body 1 for checking foreign matter in seaweed are connected by a light-shielding bellows. It is good to cover the surroundings with a light shielding box.
(7) In the embodiment, the side light shielding plate 9 that blocks both sides of the working space and the back light shielding plate that blocks the back part are provided, but the work is performed in a relatively dark room (environment less susceptible to disturbance light). In some cases, these light shielding plates may not be provided.
In addition, when working in such an environment, it is less likely to be affected by disturbance light from the front side, and it is not necessary to slide the main body 1 of the laver foreign matter confirmation device to the front side when directly viewing the dried laver. The device main body 1 may be fixed on the cantilever beam 8 .

(8) In the embodiment, when using near-infrared light (in the case of mode 1), the near-infrared light source 11 is turned on, the visible light source 15 is turned off, the camera 16 is switched on, and the camera When working with the polarizing plate 18 removed and using visible light and the camera 16 (in the case of mode 2), the near-infrared light source 11 is turned off, the visible light source 15 is turned on, and the camera 16 is turned on. , When working with the camera polarizing plate 18 attached and working visually using visible light (in the case of mode 3), the near-infrared light source 11 is turned off, the visible light source 15 is turned on, Although the camera 16 has been switched off, it is better to provide a controller that controls the switches of the near-infrared light source 11, the visible light source 15 and the camera 16 so as to match any of modes 1 to 3 above.
Furthermore, a function of automatically removing the camera polarizing plate 18 in the case of mode 1 and automatically attaching the camera polarizing plate 18 in the case of mode 2 may be added.

1: Seaweed foreign matter confirmation device main body 2: Display 3: Lower housing 4: Upper housing 5: Post 6: Upper horizontal bar 7: Middle horizontal bar 8: Cantilever beam 9: Side light shielding plate 10: LED 11: Near red External light source 12: dried seaweed 13: mounting plate 14: LED round illuminator 15: visible light source 16: camera 17: first polarizing plate 18: polarizing plate for camera 19: hinge 20: second polarizing plate 21: groove E : operator's eye P: one point on the surface of the dried seaweed 12 Q: the point closest to the point P in the visible light source 15 θ: visual observation angle α: the angle formed by the light source line segment and the lower end line segment at the front end of the dry seaweed 12 β : the angle formed by the light source line segment and the bottom line segment at the far side of the dried seaweed 12 γ: the angle formed by the light source line segment and the bottom line segment at the rear end of the dry seaweed 12

Claims (2)

A seaweed foreign matter confirmation device capable of identifying the presence of foreign matter adhering to the surface of dry laver while directly visually observing and removing the foreign matter,
a placing plate for placing dried seaweed;
A first polarizing plate is provided above the mounting plate and incorporates a visible light source for irradiating the mounting plate with visible light, and converts the visible light into linearly polarized light on the lower surface side. a rectangular parallelepiped upper housing;
The linearly polarized light specularly reflected on the surface of the dried seaweed placed on the placing plate is not transmitted, and the linearly polarized light is reflected on the surface of the dried seaweed. a second polarizing plate that passes the diffusely reflected diffusely reflected light;
a side light shielding plate that closes both side portions of a work space between the mounting plate and the upper housing;
A back light shielding plate that closes the back part of the work space is provided,
A line segment connecting a point on the surface of the dried seaweed placed on the placing plate and a point on the visible light source closest to the point is defined as a light source line segment, and the point and the point at the lower end of the second polarizing plate. , wherein the angle formed by the light source line segment and the lower end line segment is 55 degrees or more and 75 degrees or less, when the line segment connecting the point closest to is defined as the lower end line segment. a near-infrared light source provided below the mounting plate for irradiating the mounting plate with near-infrared light;
a camera provided above the placing plate for photographing the dried seaweed placed on the placing plate;
2. The laver foreign matter checking device according to claim 1, further comprising a display for displaying an image taken by said camera.

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