JP2019039695A - Optical inspection device and protective case - Google Patents

Abstract

To provide an optical inspection device and a protective case with which it is possible to heighten detection accuracy.SOLUTION: The optical inspection device comprises: a conveyance unit 3 for conveying a specimen S to an inspection region R; an excitation light irradiation unit 4 for applying excitation light in the inspection region for causing foreign matter F included in the specimen to generate fluorescence; a detection unit 5 for detecting the fluorescence generated by foreign matter in the inspection region; a pedestal unit 21 arranged upward of the conveyance unit allowing the specimen being conveyed by the conveyance unit to pass through; a protective case 23, arranged upward of the pedestal unit, for storing at least a fluorescence detection unit; and a protective unit for covering the pedestal unit from the outside in a plan view seen from above.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical inspection device and a protective case for inspecting whether or not a foreign object is contained in an object to be inspected.

  In order to inspect whether parasites and bones are included in fish and other fillets, an optical inspection device that irradiates the fillets with excitation light such as ultraviolet rays and detects fluorescence generated from bones and parasites, etc. It is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 1-311253

  In the optical inspection apparatus as described above, when light enters a space where a light detection unit that detects fluorescence generated from a parasite or the like is placed, weak fluorescence cannot be identified, and detection accuracy of the parasite or the like is not possible. May decrease.

  Then, an object of this invention is to provide the optical inspection apparatus and protective case which can raise a detection precision.

  The optical inspection apparatus of the present invention includes a transport unit that transports an inspection object to an inspection region, an excitation light irradiation unit that emits excitation light for generating fluorescence in a foreign substance contained in the inspection object in the inspection region, In the inspection area, a fluorescence detection unit that detects fluorescence emitted from a foreign substance, a pedestal unit that is disposed above the conveyance unit so that an object to be inspected conveyed by the conveyance unit can pass, and an upper part of the pedestal unit, And a protective case that houses at least the fluorescence detection unit, and a protection unit that covers the pedestal from the outside in a plan view as viewed from above.

  The optical inspection apparatus having this configuration includes a protection unit that covers the pedestal from the outside in a plan view viewed from above in the vertical direction. Thereby, since the junction part of a protection case and a base part is covered from an outer side by a protection part, it can prevent that a light penetrate | invades into the inside of a protection case from the exterior of a protection case. Thereby, weak fluorescence can be identified, and detection accuracy can be improved.

  In the optical inspection device of the present invention, it may be arranged outside the pedestal portion in plan view as viewed from above, and the lower end of the protection portion may be located at a position lower than the upper end of the pedestal portion. In the optical inspection device having this configuration, light can be prevented from entering the inside of the protective case linearly from the outside of the protective case, so that the light shielding property inside the protective case can be further enhanced.

  In the optical inspection apparatus of the present invention, the protection unit may be arranged in a frame shape so as to surround the pedestal unit. In the optical inspection device having this configuration, the protective part is disposed so as to cover all the joints between the protective case and the pedestal part, and therefore the light shielding property inside the protective case can be further enhanced.

  In the optical inspection device of the present invention, the protection unit may be formed in a protective case. In the optical inspection device having this configuration, since the trouble of separately arranging the protective member serving as the protective portion at a predetermined position can be omitted when the protective case and the pedestal portion are joined, workability at the time of joining is improved.

  In the optical inspection device of the present invention, the protective case has a box-shaped main body having an opening and a collar protruding from the periphery of the opening, and the protection is formed on the collar. Also good. In the optical inspection apparatus having this configuration, the light intrusion path between the outside of the protective case and the inside of the protective case can be lengthened by the length of the protruding flange. Thereby, the light-shielding property inside a protective case can further be improved. Further, when the seal member disposed between the protective case and the pedestal portion is disposed, the width of the seal member (length in the projecting direction) can be increased by the length of the projecting portion of the collar portion. Therefore, the sealing inside the protective case can be further enhanced.

  In the optical inspection apparatus of the present invention, the upper surface of the collar portion may be inclined downward toward the protruding direction. Thereby, even when water is applied to the protective case, it is possible to suppress water from staying in the collar portion and to suppress deterioration of the member.

  In the optical inspection apparatus of the present invention, the pedestal portion may have a window portion whose area is smaller than the opening portion of the protective case, and the fluorescence detection portion may detect the fluorescence emitted from the foreign matter through the window portion. . In the optical inspection apparatus with this configuration, light intrusion from other than the joint can be suppressed, so that the light shielding property inside the protective case can be further improved.

  In the optical inspection apparatus of the present invention, the excitation light irradiation unit may be housed in a protective case, and the excitation light irradiation unit may irradiate the inspection region with the excitation light through the window. The optical inspection apparatus having this configuration is excellent in workability because it can be handled as one unit in which the fluorescence detection unit and the excitation light irradiation unit are accommodated. Further, by accommodating the excitation light irradiation part in the protective case, the excitation light irradiation part can be protected from dust or water.

  In the optical inspection device of the present invention, an elastic seal member may be provided between the pedestal portion and the protective case. In the optical inspection device having this configuration, it is possible to more reliably suppress light from entering from the joint portion between the protective case and the pedestal portion. Moreover, since it can suppress that water and dust penetrate | invade from the said junction part, the airtightness inside a protective case can be improved.

  The optical inspection apparatus of the present invention may further include a fastening portion that fixes the protective case and the pedestal portion, and the fastening portion may penetrate the seal member via a collar member that can be inserted through the fastening portion. In the optical inspection apparatus having this configuration, the seal member can be fixed between the protective case and the pedestal portion while maintaining a desired thickness. Thereby, since the crushing condition of the seal member at the time of joining becomes uniform, it becomes difficult to form a gap. Moreover, since a fastening part is penetrated by the sealing member via a collar member, damage to the sealing member at the time of penetration can be prevented. Thereby, it can suppress that light penetrate | invades into the inside of a protective case from the damage location of a seal | sticker part. In the optical inspection apparatus having this configuration, the operator can easily maintain the internal equipment or replace the parts.

  In the optical inspection device of the present invention, the fastening portion may be provided so that fastening work and fastening release work can be performed from above the protective case. In the optical inspection apparatus having this configuration, the operator can easily maintain the internal equipment or replace the parts.

  In the optical inspection apparatus of the present invention, the pedestal part may be provided so as to be movable in a direction away from the transport part. Thereby, since the base part and the protective case integrally joined to the base part can be moved from above the transport part, the transport part can be easily cleaned.

  The protective case of the present invention includes a transport unit that transports an object to be inspected to the inspection region, an excitation light irradiation unit that emits excitation light for generating fluorescence in the foreign material in the inspection region, and a foreign material in the inspection region. Arranged on the upper part of the pedestal part of the optical inspection device comprising: a fluorescence detection part for detecting the fluorescence to be detected; and a pedestal part arranged above the transport part so that the inspection object transported by the transport part can pass therethrough, A protective case for accommodating at least a fluorescence detection unit, comprising a box-shaped main body having an opening, and the main body includes a pedestal in plan view when viewed from above when the protective case is disposed on the pedestal. A protection part is formed to cover from the outside.

  The protective case having this configuration includes a protective portion that covers the pedestal portion from the outside in a plan view as viewed from above. Thereby, since the junction part of a protection case and a base part is covered from an outer side by a protection part, it can prevent that a light penetrate | invades into the inside of a protection case from the exterior of a protection case. Thereby, weak fluorescence can be identified, and detection accuracy can be improved.

  In the protective case of the present invention, the main body portion may further include a flange portion protruding from the periphery of the opening portion, and the protection portion may be disposed along the flange portion. As a result, the light intrusion path between the outside of the protective case and the inside of the protective case can be lengthened by the length of the overhang of the collar portion. Thereby, the light-shielding property inside a protective case can further be improved. Further, when the seal member disposed between the protective case and the pedestal portion is disposed, the width of the seal member (length in the projecting direction) can be increased by the length of the projecting portion of the collar portion. Therefore, the sealing inside the protective case can be further enhanced.

  In the protective case of the present invention, an elastic seal member that contacts the pedestal portion when the protective case is disposed on the pedestal portion may be disposed inside the protective portion in the main body portion. It can suppress more reliably that light penetrate | invades from the junction part of a protective case and a base part. Moreover, since it can suppress that water and dust penetrate | invade from the said junction part, the airtightness inside a protective case can be improved.

  According to the present invention, detection accuracy can be increased.

It is a block diagram of the optical inspection apparatus of one Embodiment. It is the side view which looked at the housing | casing of the optical inspection apparatus of FIG. 1 from the carrying-in entrance side. It is the perspective view which showed the whole optical inspection apparatus in the state by which the housing | casing has been arrange | positioned on a conveyance part. It is the perspective view which showed the whole optical inspection apparatus in the state where the housing | casing was spaced apart from the conveyance part. It is sectional drawing which expanded and showed the junction part of FIG. It is the bottom view which looked at the protective case of FIG. 1 from the downward direction. It is sectional drawing which expanded and showed the junction part which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. In this specification, for convenience of explanation, as shown in FIGS. 1 to 6, the direction along the transport direction A of the transport unit 3 is the X axis, and the width direction of the transport unit 3 (the paper surface of FIG. 1). The depth direction was set as the Y axis, and the direction orthogonal to the transport surface 31a of the transport unit 3 was set as the Z axis. The X axis, the Y axis, and the Z axis are orthogonal to each other.

  As shown in FIG. 1, the optical inspection device 1 includes a housing 2, a transport unit 3, an excitation light irradiation unit 4, a detection unit (fluorescence detection unit) 5, a processing unit 6, and a display unit 7. And leg 9 (see FIG. 3). The optical inspection apparatus 1 is an apparatus for inspecting whether or not the foreign object F is included in the inspection object S. The inspection object S is mainly fillets of seafood such as mackerel, horse mackerel, squid, sardine, salmon, saury and hockey, and the foreign matter F is mainly a parasite such as anisakis and yellowtail nematode.

  As shown in FIGS. 1 and 2, the housing 2 covers the inspection area R and shields the inspection area R from light in the external area (such as indoor artificial light and natural light). The inspection region R is a three-dimensional region in the inner region L of the housing 2 where the detection unit 5 detects fluorescence. The housing 2 includes a pedestal portion 21 and a protective case 23.

  The pedestal unit 21 is disposed above the transport unit 3 so that the inspection object S transported by the transport unit 3 can pass therethrough. In the pedestal portion 21, a carry-in port 21 a for carrying the inspection object S into the internal region L and a carry-out port 21 b for carrying out the inspection item S from the inspection region R are formed. The light in the external region can enter the housing 2 through the carry-in port 21a and the carry-out port 21b of the pedestal portion 21. However, the inspection region R is separated from the external region by the pedestal portion 21 and the protective case 23. It is well shielded from light. That is, the housing 2 only needs to shield the inner region L from the light in the outer region so that detection of fluorescence described later is not hindered, and completely shields the inspection region R from the light in the outer region. There is no need.

  The protective case 23 is joined (arranged) to the upper portion of the pedestal portion 21 and accommodates the excitation light irradiation unit 4 and the detection unit 5. The protective case 23 is made of a metal such as stainless steel or a material such as plastic resin. The protective case 23 includes a box-shaped main body 24 having an opening 24a, and a flange 25 protruding from the periphery of the opening 24a. The pedestal 21 and the protective case 23 include, for example, a bolt B (see FIG. 3) inserted through an insertion hole formed in the flange 25, and the inserted bolt (fastening portion) B is formed in the pedestal 21. They are joined by being screwed into the screw holes. The bolt B is provided so that a fastening operation or a fastening release operation can be performed from above the protective case 23. Further, the bolt B penetrates the seal member 27 through a collar member 27A through which the bolt B can be inserted (see FIG. 5).

  The pedestal portion 21 has a window portion 21 c having a smaller area than the opening portion 24 a of the protective case 23. A light transmissive transparent member 21d made of PMMA (polymethyl methacrylate) resin, plastic resin, glass or the like is fitted into the window portion 21c. Thereby, it is prevented that dust or water enters from the transport unit 3. The size of the window portion 21c is such that the detection unit 5 does not hinder the fluorescence emitted from the foreign substance F through the window portion 21c, and the size capable of irradiating the excitation light of the excitation light irradiation unit 4 to the inspection region R. Is formed. The joint J between the pedestal 21 and the protective case 23 will be described in detail later.

  The transport unit 3 transports the inspection object S in the inspection region R. The transport unit 3 includes an endless conveyor belt 31 and a support unit 33.

  The conveyor belt 31 has a conveyance surface 31a parallel to an XY plane (a plane including an X axis and a Y axis orthogonal to each other, for example, a horizontal plane). The conveyor belt 31 conveys the inspection object S from the carry-in entrance 21a to the carry-out exit 21b along the carrying direction A parallel to the X axis. The surface of the conveyor belt 31 (the surface forming the conveyance surface 31a) is subjected to an antireflection treatment for suppressing reflection of excitation light, which will be described later. The antireflection treatment is, for example, coloring using a dye having a light absorptivity with respect to excitation light. An example of such a conveyor belt 31 is a black belt containing carbon. The support part 33 supports the conveyor belt 31 so that attachment or detachment is possible. The support part 33 is supported by the leg part 9.

  As shown in FIGS. 3 and 4, the housing 2 is provided so as to be movable in a direction away from the transport unit 3. Specifically, the pedestal portion 21 is supported by the support portion 33 of the conveyance portion 3 via the rotation shaft 28 extending in the conveyance direction, and the pedestal portion 21 and the protective case 23 are separated from the conveyance portion 3. It is provided so as to be movable. When the pedestal 21 moves in a direction away from the transport unit 3, the protective case 23 joined to the pedestal 21 also moves in a direction away from the transport unit 3 integrally. When the housing 2 is placed on the transport unit 3, the base unit 21 and the support unit 33 are fixed to each other by the fixing unit 29.

  The leg portion 9 supports the housing 2 and the conveyance portion 3.

  As shown in FIG. 1, the excitation light irradiation unit 4 irradiates the inspection region R with excitation light for generating fluorescence in the foreign matter F adhering to the inspection object S. Specifically, the excitation light irradiating unit 4 irradiates excitation light in an area including an area through which the conveyed inspection object S passes in the inspection area R. The excitation light irradiation unit 4 is attached to the inner wall surface of the protective case 23, and is on one side of the transport surface 31a (on one side of the transport surface 31a in a direction parallel to the Z axis perpendicular to the X axis and the Y axis). Thus, for example, the inspection object S is irradiated with excitation light from the upper side of the conveyance surface 31a in the vertical direction.

  The excitation light irradiation unit 4 includes a light source 41, a light collecting unit 42, and a first optical filter 43. The light source 41 is a plurality of light emitting elements (for example, light emitting diodes) arranged along a direction parallel to the Y axis, and emits excitation light. The condensing unit 42 is an optical element (for example, a cylindrical lens), and condenses the excitation light emitted from the light source 41 in a range including a region of the inspection region R through which the conveyed inspection object S passes. To do. Here, the condensing part 42 condenses the diverging light emitted from the light source 41 into parallel light. The first optical filter 43 transmits the excitation light, while attenuating light having a wavelength longer than the wavelength band of the excitation light. For example, when the excitation light has an ultraviolet wavelength band, the first optical filter 43 attenuates light having a visible wavelength band.

  The detection unit 5 detects fluorescence generated in the inspection region R set in advance. The detection unit 5 is attached to the inner wall surface of the housing 2 and is on one side of the conveyance surface 31a (on one side of the conveyance surface 31a in a direction parallel to the Z axis perpendicular to the X axis and the Y axis). For example, fluorescence is detected from the upper side of the conveyance surface 31a in the vertical direction.

  The detection unit 5 includes a second optical filter 51 and a plurality of light detection elements 52. The second optical filter 51 transmits the fluorescence generated by the foreign matter F, while attenuating light on the shorter wavelength side than the fluorescence wavelength band. For example, when the fluorescent light has a visible wavelength band, the second optical filter 51 attenuates light having an ultraviolet wavelength band. The plurality of light detection elements 52 are arranged along a direction parallel to the Y-axis (a crossing direction intersecting the transport direction A when viewed from a direction perpendicular to the transport surface 31a). Each light detection element 52 is a light receiving element (for example, a photodiode), and detects fluorescence transmitted through the second optical filter 51.

  The excitation light that the excitation light irradiation unit 4 irradiates the inspection object S is light for generating fluorescence in the foreign matter F, and is light having a wavelength band in the ultraviolet region, for example. The fluorescence generated by the foreign matter F by the irradiation of the excitation light is light having a wavelength different from the wavelength of the excitation light, for example, light having a visible wavelength band. In addition, the center wavelength of excitation light should just shift | deviate with respect to the center wavelength of fluorescence. That is, with respect to the excitation light and the fluorescence, it is not necessary that the wavelength bands are completely deviated as long as the center wavelengths (peak wavelengths) are deviated from each other. However, it is preferable that the wavelength band of excitation light and the wavelength band of fluorescence are completely deviated.

  The processing unit 6 generates an image of the foreign matter F based on the fluorescence detection signal generated by the foreign matter F output from the detection unit 5. The display unit 7 displays the image generated by the processing unit 6.

  Next, the joint portion J between the base portion 21 and the protective case 23 will be described in detail mainly with reference to FIGS. 5 and 6. As shown in FIGS. 5 and 6, the pedestal 21 and the protective case 23 are joined via an elastic seal member 27. In a state before being joined, the seal member 27 is made of an elastic material such as silicon rubber (silicon resin), for example, and its Z-axis direction thickness T1 is about 2 mm to 5 mm and a width along the XY plane. Is about 10 mm to 50 mm. The seal member 27 is arranged in a frame shape between the flange portion 25 and the pedestal portion 21 along the extending direction of the flange portion 25. In the seal member 27, the bolt B is vertically penetrated through the collar member 27A.

  A protective portion 26 is disposed outside the seal member 27 in a plan view as viewed from above in the Z-axis direction. Moreover, the protection part 26 covers the outer side surface 21f of the base part 21 from the outer side in the planar view seen from upper direction. The protection part 26 is integrally formed as a part of the protection case 23. More specifically, the protection part 26 is formed on the flange part 25 so as to protrude downward in the Z-axis direction. The protection part 26 is formed in a frame shape so as to surround the frame-shaped sealing member 27 and the outer surface 21 f of the pedestal part 21. Further, the protection part 26 is disposed on the outer side in the XY plane with respect to the outer surface 21f of the pedestal part 21 in a plan view seen from above in the Z-axis direction, and the lower end 26a of the protection part 26 is the upper end 21e of the pedestal part 21. It is located at a lower position. The seal member 27 may be bonded (fixed) to the protection unit 26 with a double-sided tape or the like. If comprised in this way, it will become possible to fix the position of a seal member, and to make it closely_contact | adhere, and light-shielding property, dustproof property, and waterproofness will further improve.

  As described above, in the optical inspection device 1 according to the present embodiment, the protective portion 26 is disposed outside the pedestal portion 21 in the XY plane so as to cover the pedestal portion 21, so that the protective case 23 and the pedestal portion are arranged. It is possible to more reliably prevent light from entering the inner region L of the protective case 23 from the joint portion J with 21. Thereby, weak fluorescence can be identified, and detection accuracy can be improved.

  Further, as shown in FIG. 5, the protection unit 26 of the optical inspection device 1 of the present embodiment is disposed on the outer side in the XY plane with respect to the outer side surface 21 f of the pedestal unit 21 in a plan view viewed from the Z-axis direction. The lower end 26a of the protection part 26 is located at a lower position in the Z-axis direction than the upper end 21e of the pedestal part 21. That is, a part of the protective case 23 and a part of the pedestal 21 are overlapped with each other in the vertical direction (Z-axis direction). For this reason, since light can be prevented from entering the inner region L of the protective case 23 linearly from the joint portion J, the hermeticity of the inner region L of the protective case 23 can be further enhanced.

  In the optical inspection device 1 of the present embodiment, as shown in FIG. 5, the pedestal 21 and the protective case 23 are joined via an elastic seal member 27, so that not only light intrusion but also water Intrusion of dust can also be suppressed. For this reason, while improving the light-shielding property of the internal area | region L of the protective case 23, waterproofness and dustproofness can also be improved. Further, in this configuration, even if the seal member 27 is deteriorated due to aging, the presence of the protective portion 26 can also suppress the intrusion of water and dust into the inner region L of the protective case 23.

  In the optical inspection device 1 of the present embodiment, since the protection part 26 is formed integrally with the protection case 23, a protective member serving as the protection part 26 is a predetermined member when the protection case 23 and the pedestal part 21 are joined. It is possible to eliminate the trouble of separately arranging the position. Thereby, workability | operativity at the time of joining improves.

  As shown in FIG. 5, the protective case 23 of the optical inspection device 1 of the present embodiment is formed with a flange portion 25 that protrudes from the periphery of the opening 24 a in the main body portion 24. As a result, the light intrusion path between the outer region of the protective case 23 and the inner region L of the protective case 23 can be lengthened by the length of the overhang of the flange 25. Thereby, the light-shielding property of the inner region L of the protective case 23 can be further enhanced. Furthermore, in this configuration, the width L1 of the seal member 27 disposed between the outer region and the inner region L of the protective case 23 can be increased by the length L2 of the overhang 25, so that the protection The sealing property of the inner region L of the case 23 can be further enhanced.

  In the optical inspection device 1 of the present embodiment, as shown in FIG. 6, the seal member 27 is arranged in a frame shape, and the protection part 26 is arranged in a frame shape so as to surround the seal member 27 arranged in a frame shape. ing. Thereby, since the sealing member 27 is disposed so as to block all the paths through which light enters from the joint portion J between the protective case 23 and the pedestal portion 21, the sealing performance of the inner region L of the protective case 23 can be further improved. it can. In addition, in this configuration, not only light but also water and dust can be prevented from entering. For this reason, the waterproofness and dustproofness of the inner region L of the protective case 23 can be further enhanced.

  As shown in FIGS. 3 and 5, the optical inspection device 1 according to the present embodiment enables the fastening or unfastening operation of the bolt B that fixes the protective case 23 and the pedestal portion 21 from above the protective case 23. Since it is provided, the operator can easily maintain the internal equipment or replace the parts. Further, since the bolt B penetrates the seal member 27 via the collar member 27A through which the bolt B can be inserted, the seal member 27 can be reliably fixed at a desired position. Moreover, since the bolt B is penetrated by the seal member 27 via the collar member 27A, damage to the seal member 27 at the time of penetration can be prevented. Thereby, it is possible to prevent light from entering the internal region L of the protective case 23 from the damaged portion of the seal member 27.

  In the optical inspection device 1 of the present embodiment, the excitation light irradiation unit 4 is accommodated in the protective case 23, and therefore the protection case 23 is handled as one unit in which the detection unit 5 and the excitation light irradiation unit 4 are accommodated. And workability is excellent. Moreover, by accommodating the excitation light irradiation part 4 in the protective case 23, the excitation light irradiation part 4 can be protected from dust or water.

  In the optical inspection device 1 of the present embodiment, since the area of the window portion 21c provided in the pedestal portion 21 is smaller than the area of the opening portion 24a, intrusion of light from other than the joint portion J can be suppressed. Thereby, the airtightness of the inner region L of the protective case 23 can be further enhanced.

  In the optical inspection device 1 of the present embodiment, as shown in FIG. 4, the pedestal portion 21 is provided so as to be movable in a direction away from the transport portion 3. Thereby, since the base part 21 and the protective case 23 integrally joined to the base part 21 can be moved from the upper part of the conveyance part 3, the conveyance part 3 can be easily cleaned. Moreover, the base part 21 (further, the excitation light irradiation part 4 and the detection part (fluorescence detection part) 5 accommodated) can be separated from the jet water or the like when the transport part 3 is cleaned.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment.

  In the optical inspection device 1 of the above embodiment, in a state where inspection is possible, that is, in a state where the housing 2 is disposed above the transport unit 3, the upper surface 26 b of the flange portion 25 extends in the horizontal direction toward the overhanging direction. Although the example which has extended was demonstrated, the upper surface 26c of the collar part 25 may incline below toward the overhang | projection direction. According to this structure, it can suppress that water accumulates on the upper surface 26c of the collar part 25, and can suppress deterioration of a member.

  In the optical inspection device 1 of the above embodiment or the modification, the protective case 23 has been described with an example in which the flange portion 25 protruding from the periphery of the opening 24a is formed, but the flange portion 25 is not formed. A protective case 23 may be employed. For example, as shown in FIG. 7, the protective part 26 </ b> E may be formed at the lower end of the main body part 24 of the protective case 23 so as to protrude downward in the Z-axis direction. Also in this case, the same effect as that of the above embodiment can be obtained if the protective portion 26E is disposed outside the seal member 27 when viewed from the Z-axis direction. Also in the case of the optical inspection device 1 according to the modification, it is not essential to position the lower end 26a of the protection part 26 at a position lower than the upper end 21e of the pedestal part 21 as in the above embodiment. However, the light shielding property of the inner region L of the protective case 23 can be further enhanced by positioning the lower end 26 a of the protective portion 26 at a position lower than the upper end 21 e of the pedestal portion 21.

  In the optical inspection device 1 of the above embodiment or the modified example, the protection units 26 and 26E have been described as an example formed integrally with the protection case 23. However, when the protection case 23 and the pedestal unit 21 are joined, Further, a configuration may be adopted in which the protection unit as a separate member is disposed at a predetermined position. For example, the protection part may be formed so as to cover the end part of the protection case 23 in addition to the base part 21. Specifically, a frame-like member that covers the outer surface of the pedestal portion 21 and the protective case 23 is included as a protective portion so as to include the joint portion of the pedestal portion 21 and the protective case 23 when viewed from above in the Z-axis direction. It may be a configuration. Even in this case, the same effects as those of the optical inspection apparatus 1 according to the embodiment or the modification can be obtained. However, if the protective portions 26 and 26E are formed integrally with the protective case 23, the labor for arranging the protective portions can be omitted, so that the workability at the time of joining is improved. Further, the protective portions 26 and 26E are preferably formed integrally with the protective case 23 because the gap (joining portion) is reduced accordingly, which is also preferable in terms of dustproofing and waterproofing.

  In the optical inspection device 1 of the above embodiment or the modification, the example in which the sealing member 27 having elasticity is provided between the pedestal portion and the protective case has been described, but the sealing member 27 is not provided. Also good. Even in this case, the light shielding property of the inner region L of the protective case 23 can be enhanced. When the seal member 27 is not provided, the distance between the lower end 26a of the protection part 26 and the upper end 21e of the pedestal part 21 in the Z-axis direction, that is, the vertical direction between the protection case 23 and the pedestal part 21 (Z-axis direction). It is preferable to ensure a longer overlap distance than the distance of the optical inspection apparatus 1 of the above-described embodiment or modification. That is, the overlap distance is appropriately set so that light does not enter from the joint portion J between the protective case 23 and the pedestal portion 21.

  For example, the inspection object S may be meat other than seafood fillets, and the foreign matter F may be bones, scales, internal organs, and the like other than parasites. The excitation light is not limited to light having a wavelength band in the ultraviolet region, and may be light having a wavelength that can cause the foreign substance F to generate fluorescence. In addition, the excitation light irradiation unit 4 is located on the downstream side of the detection unit 5 in the transport direction A, but may be located on the upstream side of the detection unit 5 in the transport direction A. Further, the processing unit 6 may inspect whether or not the foreign object F is included in the inspection object S based on the generated image. In this case, the presence / absence of the foreign matter F in the inspection object S can be automatically specified (with respect to the image), and the operator can also confirm it visually.

  Finally, for each foreign substance F, a preferable range of the wavelength of excitation light and the range of the wavelength of fluorescence generated thereby will be exemplified.

  When the foreign substance F is anisakis, the preferable wavelength range of excitation light is 300 to 400 nm (more preferably 330 to 350 nm), and the wavelength range of the fluorescence generated thereby is 380 to 500 nm (more preferably Is 420 to 450 nm).

  When the foreign substance F is a yellow nematode, a suitable wavelength range of excitation light is 350 to 450 nm (more preferably, 370 to 390 nm), and a wavelength range of fluorescence generated thereby is 420 to 530 nm ( More preferably, it is 440-470 nm.

  When the foreign substance F is mackerel bone, the wavelength range of suitable excitation light is 320 to 380 nm (more preferably 320 to 340 nm), and the wavelength range of the fluorescence generated thereby is 380 to 430 nm ( More preferably, it is 380 to 400 nm.

  When the foreign substance F is a Thai scale, a preferable wavelength range of excitation light is 300 to 400 nm (more preferably 320 to 340 nm), and a wavelength range of fluorescence generated thereby is 380 to 500 nm ( More preferably, it is 380 to 400 nm.

  When the foreign substance F is a visceral organ in Thailand, a preferable wavelength range of excitation light is 320 to 500 nm (more preferably 360 to 380 nm), and a wavelength range of fluorescence generated thereby is 480 to 580 nm ( More preferably, it is 510-530 nm.

  DESCRIPTION OF SYMBOLS 1 ... Optical inspection apparatus, 2 ... Housing | casing, 3 ... Conveyance part, 4 ... Excitation light irradiation part, 5 ... Detection part (fluorescence detection part), 21 ... Base part, 21c ... Window part, 21e ... Upper end, 21f ... Out Side surface, 23 ... protective case, 24 ... main body, 24a ... opening, 25 ... collar, 26, 26E ... protective part, 26a ... lower end, 27 ... sealing member, 27A ... collar member, 31a ... transport surface, 33 ... Support portion, B ... bolt (fastening portion), F ... foreign matter, J ... joined portion, L ... inner region, R ... inspection region, S ... inspected object.

Claims (15)

A transport unit for transporting the inspection object to the inspection area;
In the inspection region, an excitation light irradiation unit that emits excitation light for generating fluorescence in the foreign matter contained in the inspection object;
A fluorescence detector for detecting fluorescence emitted from the foreign substance in the inspection region;
A pedestal unit disposed above the transport unit so that the inspection object transported by the transport unit can pass through;
A protective case disposed at the top of the pedestal and containing at least the fluorescence detection unit;
A protective part that covers the pedestal part from the outside in a plan view seen from above;
An optical inspection device.   The optical inspection according to claim 1, wherein the protection part is disposed outside the pedestal part in a plan view viewed from above, and a lower end of the protection part is located at a position lower than an upper end of the pedestal part. apparatus.   The optical inspection apparatus according to claim 1, wherein the protection part is arranged in a frame shape so as to surround the pedestal part.   The optical inspection apparatus according to claim 1, wherein the protection unit is formed in the protection case. The protective case has a box-shaped main body having an opening, and a flange protruding from the periphery of the opening,
The optical inspection apparatus according to claim 1, wherein the protection part is formed in the collar part.   The optical inspection apparatus according to claim 5, wherein an upper surface of the flange portion is inclined downward toward an overhang direction. The pedestal has a window having a smaller area than the opening of the protective case,
The optical inspection apparatus according to claim 5 or 6, wherein the fluorescence detection unit detects fluorescence emitted from the foreign matter through the window. The excitation light irradiation unit is accommodated in the protective case,
The optical inspection apparatus according to claim 7, wherein the excitation light irradiation unit irradiates the inspection region with excitation light through the window portion.   The optical inspection device according to claim 1, wherein an elastic seal member is provided between the pedestal portion and the protective case.   The light according to claim 9, further comprising a fastening portion that fixes the protective case and the pedestal portion, wherein the fastening portion penetrates the seal member through a collar member that can be inserted through the fastening portion. Inspection device.   The optical inspection apparatus according to claim 10, wherein the fastening portion is provided so that fastening work and fastening release work are possible from above the protective case.   The optical inspection apparatus according to any one of claims 1 to 11, wherein the pedestal part is provided so as to be movable in a direction away from the transport part. A transport unit that transports an object to be inspected to the inspection region, an excitation light irradiation unit that emits excitation light for generating fluorescence in the foreign material in the inspection region, and a fluorescence emitted from the foreign material in the inspection region is detected. Arranged on the upper part of the pedestal part of the optical inspection device, comprising: a fluorescence detection unit that performs, and a pedestal part that is arranged above the conveyance unit so that the inspection object conveyed by the conveyance unit can pass through. A protective case containing at least the fluorescence detection unit,
Provided with a box-shaped main body having an opening,
A protective case in which the main body is formed with a protective portion that covers the pedestal portion from the outside in a plan view as viewed from above when the protective case is disposed on the pedestal portion. The main body portion further includes a collar portion protruding from the periphery of the opening,
The protective case according to claim 13, wherein the protective part is disposed along the collar part.   The protective case according to claim 13 or 14, wherein an elastic sealing member that contacts the pedestal portion when the protective case is disposed on the pedestal portion is disposed inside the protective portion in the main body portion. .

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