JP2007066059A - Fluorescent reference member, and fluorescence inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent reference member capable of providing highly reliable detection criteria, and a fluorescence inspection device comprising the fluorescent reference member. <P>SOLUTION: The fluorescence inspection device 1 comprises a pair of conveyance rollers 2 for conveying a medium M to be inspected in the direction of an arrow T through a conveyance path 3; an ultraviolet light source 4 placed on one side of the conveyance path 3; a fluorescent reference plate 6 arranged to face the ultraviolet light source 4 across the conveyance path 3; and a reading sensor 5 for receiving fluorescence from the medium M conveyed through the conveyance path 3 and also receiving the fluorescence from the fluorescent reference plate 6 while the medium M is not conveyed. All surfaces of the fluorescent reference plate 6 are mirror finished by optical polishing, and all the surfaces, except for the side 6a facing the conveyance path 3, are covered with a light absorbing material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluorescence inspection apparatus that detects fluorescence emitted from a medium by irradiating excitation light onto a medium that includes, for example, a fluorescent substance that is symmetrical to the inspection, and a fluorescence reference member that is incorporated in the fluorescence inspection apparatus.

  DESCRIPTION OF RELATED ART Conventionally, the banknote inspection apparatus which detects the fluorescence discharge | released from the banknote surface by irradiating the banknote conveyed through a conveyance path with an ultraviolet-ray is known as a fluorescence inspection apparatus (for example, refer patent document 1). This apparatus has a fluorescent sensor that houses and arranges a light emitting element and a light receiving element on one side of the conveyance path, and has fluorescent glass for providing a detection reference on the other side of the conveyance path. And when inspecting a banknote, the fluorescence amount of fluorescent glass is detected in the state which is not conveying a banknote, and the light emission amount of a light emitting element is correct | amended based on the detected value.

However, fluorescent glass is not limited to an irradiation surface irradiated with ultraviolet rays or a light emitting surface emitting fluorescence, and the amount of fluorescence emitted with respect to excitation light varies depending on the state of the surface. For this reason, the amount of emitted light varies between individuals at the time of shipment or over time due to the influence of the reflectance of the holding tool and adhesive for holding the fluorescent glass, dust and scratches attached to the surface, etc. End up. In particular, when the surface is roughened by sandblasting in order to increase the light emission amount of the fluorescent glass, it becomes difficult to control the variation between individuals.
JP 2004-265104 A (summary, FIG. 2)

  An object of the present invention is to provide a fluorescence reference member capable of providing a highly reliable detection reference, and a fluorescence inspection apparatus including the fluorescence reference member.

  In order to achieve the above object, the fluorescence reference member of the present invention includes an irradiation surface on which excitation light is irradiated, a main body having a light emitting surface that emits fluorescence based on the irradiated excitation light, and the irradiation of the main body. And a light absorbing material coated on all surfaces except the surface and the light emitting surface.

  Further, the fluorescence inspection apparatus of the present invention includes a light source that irradiates excitation light to a medium that is symmetrical to the inspection, an irradiation surface that is irradiated with excitation light from the light source, and the excitation light that is irradiated through the irradiation surface. A fluorescent reference member comprising: a main body having a light emitting surface that emits fluorescence that is excited based on the light; and a light-absorbing material coated on all surfaces of the main body excluding the irradiation surface and the light emitting surface; and the light source A light receiving unit that selectively receives the first fluorescence emitted from the fluorescent material included in the medium and the second fluorescence emitted from the fluorescence reference member based on the excitation light emitted from the medium; A correction unit that corrects the output of the light receiving unit based on the second fluorescence received by the light receiving unit, and an inspection unit that inspects the first fluorescence corrected by the correction unit.

  In addition, the fluorescence inspection apparatus of the present invention includes a light source that irradiates excitation light to a medium that is symmetrical to the inspection, and a first light that is excited and emitted from the fluorescent material included in the medium based on the excitation light emitted from the light source. A first light receiving unit that receives fluorescence, an irradiation surface that is irradiated with excitation light from the light source, and second fluorescence that is excited and emitted based on the excitation light that is irradiated through the irradiation surface. A fluorescent reference member comprising a main body having a light emitting surface, and a light absorbing material coated on all surfaces except the irradiation surface and the light emitting surface of the main body, and light is emitted through the light emitting surface of the fluorescent reference member. A second light receiving unit that receives the second fluorescence, a correction unit that corrects the output of the first light receiving unit based on the second fluorescence received by the second light receiving unit, and a correction performed by the correction unit. An inspection section for inspecting the first fluorescence.

  Further, the fluorescence inspection apparatus of the present invention includes a light source that irradiates excitation light to a medium that is symmetrical to the inspection, an irradiation surface that is irradiated with excitation light from the light source, and the excitation light that is irradiated through the irradiation surface. A fluorescent reference member comprising: a main body having a light emitting surface that emits fluorescence that is excited based on the light; and a light-absorbing material coated on all surfaces of the main body excluding the irradiation surface and the light emitting surface; and the light source A light receiving unit that selectively receives the first fluorescence emitted from the fluorescent material included in the medium and the second fluorescence emitted from the fluorescence reference member based on the excitation light emitted from the medium; An inspection unit that inspects the first fluorescence received by the light receiving unit and a correction unit that corrects the light emission amount of the light source based on the second fluorescence received by the light receiving unit.

  Furthermore, the fluorescence inspection apparatus of the present invention includes a light source that irradiates excitation light onto a medium that is symmetrical to the inspection, and a first light that is excited and emitted from the fluorescent material contained in the medium based on the excitation light emitted from the light source. A first light-receiving unit that receives fluorescence, an inspection unit that inspects the first fluorescence received by the first light-receiving unit, an irradiation surface to which excitation light from the light source is irradiated, and the irradiation surface A main body having a light emitting surface that emits second fluorescence that is excited and emitted based on the irradiated excitation light, and a light-absorbing material that is coated on all surfaces except the irradiation surface and the light emitting surface of the main body. Based on the fluorescence reference member provided, a second light receiving portion for receiving the second fluorescence emitted through the light emitting surface of the fluorescence reference member, and the second fluorescence received by the second light receiving portion A correction unit that corrects the light emission amount of the light source. .

  According to the above invention, the fluorescence reference member for providing the inspection reference is formed by coating the light absorbing material on all surfaces except the irradiation surface of the excitation light and the light emission surface of the fluorescence. The influence of light reflection from the holding tool and the adhesive and the influence of the reflectance fluctuation due to scratches and dust do not act on the surface of the fluorescent reference member.

  According to the present invention, it is possible to provide a fluorescence reference member that can provide a highly reliable detection reference, and a fluorescence inspection apparatus including the fluorescence reference member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 schematically shows a configuration of a main part of a fluorescence inspection apparatus 1 according to the first embodiment of the present invention. FIG. 2 shows a plan view of the fluorescence inspection apparatus 1, and FIG. 3 shows a side view of the fluorescence inspection apparatus 1 as viewed from the downstream side in the conveyance direction of the medium M (the direction of arrow T in the figure). It is.

  The fluorescence inspection apparatus 1 includes a plurality of transport roller pairs 2 that transport a medium M that is symmetrical to the inspection in the direction of arrow T in the figure. For example, when the medium M is a banknote, the ink printed on the banknote includes a fluorescent substance that is symmetrical to the detection, and the fluorescence inspection apparatus 1 emits excitation light from the fluorescent substance by irradiating the fluorescent substance with ultraviolet light. The true / false of the banknote is discriminated by detecting the fluorescence. A fluorescent substance is excited by ultraviolet light having a specific wavelength band, and has a characteristic of emitting fluorescence having a specific wavelength band.

  For irradiating the medium M conveyed along the conveyance path 3 with ultraviolet light (excitation light) on one side (front side in FIG. 1) of the conveyance path 3 defined by the plurality of pairs of conveyance rollers 2. Two ultraviolet light sources 4 (light sources) are provided along the transport direction T. As the ultraviolet light source 4, a black light or a UV lamp having a tube axis extending in a direction intersecting the conveyance direction T of the medium M is used so that the entire surface of the medium M can be illuminated.

  On the same side as the ultraviolet light source 4 with respect to the conveyance path 3, a reading sensor 5 (light receiving unit) for receiving fluorescence (first fluorescence) excited and emitted from the fluorescent material contained in the medium M by irradiation with ultraviolet light. , A first light receiving unit). A fluorescence reference plate 6 (fluorescence reference member) for providing a detection reference is provided at a position facing the reading sensor 5 with the conveyance path 3 interposed therebetween.

  In a state where the medium M is not transported through the transport path 3, the fluorescent reference plate 6 is irradiated with ultraviolet light from the ultraviolet light source 4, and the fluorescent material contained in the fluorescent reference plate 6 is excited by the ultraviolet light, and the fluorescence. (Second fluorescence) is condensed on the reading sensor 5 through an optical system such as a lens (not shown). That is, the reading sensor 5 of the present embodiment also functions as the second light receiving unit of the present invention.

  As shown in FIG. 4, the fluorescence reference plate 6 is formed of, for example, a rectangular parallelepiped fluorescent glass (main body) having a surface 6a on which ultraviolet light from the ultraviolet light source 4 is incident. The fluorescent reference plate 6 is not limited to such a hexahedron, but may be a polyhedron. All surfaces of the fluorescent reference plate 6 (six surfaces in the present embodiment) are mirror-finished by optical polishing. As fluorescent glass, for example, Lumiras (trade name) manufactured by Sumita Optical Glass Co., Ltd. is known. The fluorescent reference plate 6 is attached adjacent to the conveyance path 3 by a holding tool or the like (not shown) with the surface 6 a facing the conveyance path 3. The fluorescent reference plate 6 of the present embodiment is characterized in that five surfaces other than the surface 6a on which the ultraviolet light is incident are covered with the light absorbing material 7.

  As the light absorbing material 7, for example, a commercially available “lens sanitizing agent” (trade name: Macron, etc.) is known, and such a material is applied to all surfaces except the surface 6 a of the fluorescent reference plate 6. Non-reflective / non-transparent treatment was applied by means such as vapor deposition. In the present embodiment, the light absorbing material 7 is coated to absorb light in the ultraviolet wavelength region to the visible wavelength region. For this reason, it is possible to prevent light having an undesired wavelength from entering the fluorescent reference plate 6 through a surface other than the surface 6a, and to eliminate fluctuations in the light emission amount due to changes in the surrounding environment.

  Accordingly, when the fluorescent reference plate 6 is irradiated with ultraviolet light from the ultraviolet light source 4 through the surface 6a, the fluorescent substance contained in the fluorescent reference plate 6 is excited to emit fluorescence. Since the fluorescent material of the fluorescent reference plate 6 is uniformly dispersed, the fluorescence emitted from the fluorescent material is uniformly diffused in all directions. However, since all surfaces other than the surface 6a are covered with the light absorbing material 7, the fluorescence is emitted from the fluorescence reference plate 6 only through the surface 6a. That is, the surface 6a of the fluorescence reference plate 6 functions as an irradiation surface of the present invention on which ultraviolet light is irradiated and also functions as a light emitting surface of the present invention that emits fluorescence.

  Thus, when the fluorescent reference plate 6 is irradiated with ultraviolet light via the surface 6a, all other surfaces are mirror-finished and five surfaces are covered with the light absorbing material 7, so that the fluorescence The amount of fluorescence emission does not change according to the state of the surface of the reference plate 6, and the amount of emission can be stabilized depending only on the amount of excitation light irradiation. For example, reflected light from a holding tool or an adhesive (not shown) for holding the fluorescent reference plate 6 does not enter the fluorescent reference plate 6, and is affected by dust or scratches attached to the surface of the fluorescent reference plate 6. The reflectance of the surface does not change, and the amount of light emitted from the fluorescent reference plate 6 is determined only by the amount of excitation light applied and the thickness of the fluorescent glass. In other words, by using the fluorescence reference plate 6 of the present embodiment, it is possible to obtain a light emission amount that depends only on the irradiation amount of excitation light, to stabilize the light emission amount of fluorescence, and to provide a highly reliable detection standard. Can be given. Further, the fluorescence reference plate 6 of the present embodiment can easily control the light emission amount by controlling the thickness thereof.

FIG. 5 shows a block diagram of a control system for controlling the processing operation by the fluorescence inspection apparatus 1 described above.
The control system of the fluorescence inspection apparatus 1 receives the first fluorescence from the medium M (inspection object) and receives the second fluorescence from the fluorescence reference plate 6, and based on the received fluorescence. An amplifier 11 that amplifies a sensor signal output from the reading sensor 5, and a variable gain amplifier 12 that changes and corrects the amplification factor of the sensor signal based on the first fluorescence based on the sensor signal based on the second fluorescence. A correction unit), the A / D converter 13 for A / D converting the sensor signal based on the corrected first fluorescence, and the A / D converted sensor signal as a determination criterion prepared in advance in the determination criterion memory 14 A determination processing circuit 10 (inspection unit) that verifies and inspects and determines the authenticity of the medium M is included.

  According to the above configuration, the output of the reading sensor 5, that is, the sensor signal based on the first fluorescence from the medium M, is corrected based on the sensor signal based on the second fluorescence from the fluorescence reference plate 6. It is possible to accurately correct sensor output fluctuations based on deterioration of the light source 4 over time. That is, by using the fluorescence reference plate 6 of the present embodiment, it is possible to detect fluctuations in the amount of light of the ultraviolet light source 4 with a high S / N ratio and to provide a highly reliable detection reference.

  In the above-described first embodiment, a case has been described in which the fluorescence reference plate 6 is used to give a highly reliable detection reference and the sensor output is corrected. For example, as shown in FIG. 5 is connected to the output side of the amplifier 11 for amplifying the sensor signal 5, and the sensor signal is collated with a correction reference prepared in advance in the correction reference memory 19 to correct the light emission amount of the ultraviolet light source 4. You can also.

  Next, a fluorescence inspection apparatus 20 according to the second embodiment of the invention will be described with reference to FIGS. Here, the same reference numerals are given to components that function in the same manner as the fluorescence inspection apparatus 1 of the first embodiment described above, and detailed description thereof is omitted.

  As shown in FIGS. 7 to 9, the fluorescence inspection apparatus 20 is positioned away from the conveyance path of the medium M on the opposite side of the conveyance path 3 with respect to the ultraviolet light source 4 (position displaced upward in the drawing in FIG. 9). A fluorescence reference plate 22 is provided. Then, an ultraviolet monitor sensor 24 different from the reading sensor 5 that receives the fluorescence (second fluorescence) excited and emitted from the fluorescence reference plate 22 is provided.

  As shown in FIG. 10, in the fluorescence reference plate 22 of the present embodiment, the irradiation surface 22a irradiated with ultraviolet light from the ultraviolet light source 4 and the light emitting surface 22b emitting fluorescence by excitation of the ultraviolet light are opposed to each other. It is formed by a rectangular parallelepiped-shaped fluorescent glass. All the surfaces (four surfaces in the present embodiment) except for the irradiation surface 22a and the light emitting surface 22b are covered with the light absorbing material 7 described above.

  The fluorescent reference plate 22 is attached to the apparatus 20 in such a posture that the irradiation surface 22a faces the ultraviolet light source 4, and is attached so that the ultraviolet monitor sensor 24 faces the opposite light emitting surface 22b. Accordingly, the ultraviolet light from the ultraviolet light source 4 is irradiated onto the medium M transported through the transport path 3 and is also irradiated onto the fluorescence reference plate 22 at a position off the transport path 3, from the fluorescence reference plate 22. The excited fluorescence is received by the ultraviolet monitor sensor 24.

  The second fluorescence received by the ultraviolet monitor sensor 24 in this way is output as a sensor signal to the amplifier 16 (FIG. 11), where the sensor output is amplified and output to the gain variable amplifier 12. Then, the sensor signal based on the fluorescence from the medium M is corrected in the same manner as in the first embodiment, is output to the discrimination processing circuit 10 via the A / D converter 13, and is checked against the judgment criteria. .

  As mentioned above, also in 2nd Embodiment, there can exist an effect similar to 1st Embodiment mentioned above. In the second embodiment, the sensor signal can be corrected at any time during conveyance of the medium M, and the reliability can be further improved. Further, as shown in FIG. 12, the light emission amount correction circuit 18 described above is connected to the output side of the amplifier 16 for amplifying the sensor signal of the ultraviolet monitor sensor 24, and the sensor signal is corrected in advance in the correction reference memory 19. The amount of light emitted from the ultraviolet light source 4 can be corrected by matching with the reference.

  FIG. 13 schematically shows a configuration of a main part of a fluorescence inspection apparatus 30 according to the third embodiment of the present invention. Also here, the same reference numerals are given to components that function in the same manner as the fluorescence inspection apparatuses of the first and second embodiments described above, and detailed description thereof will be omitted.

  This fluorescence inspection apparatus 30 has an elongated fluorescent reference plate 32 extending in a direction substantially perpendicular to the conveyance direction T of the medium M, and a CCD line sensor 34, for example, is arranged as a reading sensor. Needless to say, all the surfaces of the fluorescence reference plate 32 other than the surface 32a facing the conveyance path 3 are covered with the light absorbing material 7 described above.

  According to the present embodiment, when inspecting the fluorescence intensity distribution along the width direction of the medium M, a highly reliable inspection standard can be provided along the width direction of the medium M.

Hereinafter, modified examples of the fluorescence reference plate will be described with reference to FIGS.
The fluorescent reference plates 6, 22, and 32 of the first to third embodiments described above are each formed in a polyhedron. For this reason, when the light absorbing material 7 is coated on all surfaces except the excitation light irradiation surface and the fluorescent light emitting surface, the light absorbing material 7 may not be well coated on corners formed between adjacent surfaces. is there. As described above, when a portion that is not covered with the light absorbing material 7 is generated, light having a desired wavelength component enters from the outside through this portion into the fluorescence reference plate, and the amount of emitted fluorescence depends only on the amount of excitation light. I will not.

  For this reason, for example, as shown in FIG. 14, the corners formed by all surfaces except the excitation light irradiation surface and the fluorescence emission surface are chamfered so that the light-absorbing material 7 is covered even at the corners. Easy to do. Further, as shown in FIGS. 15 to 17, all the surfaces except the irradiation surface and the light emitting surface (which may be the same surface) are formed by one continuous curved surface, so that the light absorbing material 7 can be easily covered. . For example, in the example shown in FIG. 15, hemispherical fluorescent glass (fluorescence reference member) 44 is employed as the fluorescence reference plate, and the light absorbing material 7 is applied to one continuous curved surface (the surface of the sphere) excluding the circular surface 44a. Covered. Further, in the example shown in FIG. 16, the two surfaces 46a and 46b obtained by cutting the sphere at two places are used as the small inclined surface and the light emitting surface, and the light absorbing material 7 is coated on the other continuous curved surface (the surface of the sphere). Further, in the example shown in FIG. 17, a cylindrical fluorescent glass is prepared and the light absorbing material 7 is coated on the peripheral surface thereof.

  As described above, by making the surface that covers the light absorbing material 7 a curved surface as in the modified examples shown in FIGS. 14 to 17, the light absorbing material 7 can be reliably covered, and the portion that is not covered with the light absorbing material 7 can be formed. Fluorescent reference member that can be eliminated, can prevent external light from entering the fluorescent reference member, can emit fluorescence with a stable light emission amount that depends only on the amount of excitation light, and can provide a stable inspection standard Can provide.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  For example, in the above-described embodiment, the fluorescent reference plate mainly composed of a hexahedron has been described. However, the present invention is not limited to this, and other polyhedral shapes such as a tetrahedron and a decahedron can be used. Moreover, although embodiment mentioned above demonstrated the case where the fluorescent substance contained in a banknote was test | inspected, not only this but the medium M used as test | inspection object may be what. Further, in the above-described embodiment, the case where ultraviolet light is used as excitation light has been described. However, the present invention is not limited to this, and light having another wavelength band can also be used as excitation light.

The schematic perspective view which shows the structure of the principal part of the fluorescence inspection apparatus which concerns on 1st Embodiment of this invention. The top view of the fluorescence inspection apparatus of FIG. The side view which looked at the fluorescence inspection apparatus of FIG. 1 from the conveyance direction of the medium downstream. FIG. 2 is a perspective view showing a schematic structure of a fluorescence reference plate incorporated in the fluorescence inspection apparatus of FIG. 1. The block diagram which shows the control system for controlling the processing operation of the fluorescence inspection apparatus of FIG. The block diagram for demonstrating the example which correct | amends the light quantity of an ultraviolet light source. The schematic perspective view which shows the structure of the principal part of the fluorescence inspection apparatus which concerns on 2nd Embodiment of this invention. The top view of the fluorescence inspection apparatus of FIG. The side view which looked at the fluorescence inspection apparatus of FIG. 7 from the conveyance direction of the medium. The perspective view which shows schematic structure of the fluorescence reference | standard board integrated in the fluorescence inspection apparatus of FIG. The block diagram which shows the control system for controlling the processing operation of the fluorescence inspection apparatus of FIG. The block diagram for demonstrating the example which correct | amends the light quantity of an ultraviolet light source. Schematic which shows the structure of the principal part of the fluorescence inspection apparatus which concerns on 3rd Embodiment of this invention. The schematic perspective view which shows the fluorescence reference | standard member which concerns on other embodiment. The schematic perspective view which shows the fluorescence reference | standard member which concerns on other embodiment. The schematic perspective view which shows the fluorescence reference | standard member which concerns on other embodiment. The schematic perspective view which shows the fluorescence reference | standard member which concerns on other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 20, 30 ... Fluorescence inspection apparatus, 2 ... Conveying roller pair, 3 ... Conveyance path, 4 ... Ultraviolet light source, 5 ... Reading sensor, 6, 22, 32 ... Fluorescence reference | standard board, 7 ... Light absorption material.

Claims (13)

A main body having an irradiation surface irradiated with excitation light, and a light emitting surface that emits fluorescence based on the irradiated excitation light;
And a light-absorbing material coated on all surfaces except the irradiation surface and the light-emitting surface of the main body.   The fluorescent reference member according to claim 1, wherein the irradiation surface and the light emitting surface of the main body constitute the same surface.   The fluorescent reference member according to claim 1, wherein all surfaces including the irradiation surface and the light emitting surface of the main body are optically polished.   The fluorescent reference member according to any one of claims 1 to 3, wherein all surfaces except the irradiation surface and the light emitting surface of the main body are formed by one continuous curved surface.   The said main body is formed in the polyhedron which has the said irradiation surface and a light emission surface, The corner | angular part which all the surfaces except the said irradiation surface and a light emission surface form is chamfered. The fluorescent reference member according to any one of the above. A light source that irradiates excitation light to a medium that is symmetrical to the inspection;
A main body having an irradiation surface irradiated with excitation light from the light source, a light emitting surface emitting fluorescence emitted based on the excitation light irradiated through the irradiation surface, and the irradiation surface of the main body And a fluorescent reference member comprising a light-absorbing material coated on all surfaces except the light-emitting surface,
A light receiving unit that selectively receives the first fluorescence emitted from the fluorescent material included in the medium and the second fluorescence emitted from the fluorescence reference member based on the excitation light emitted from the light source. When,
A correction unit for correcting the output of the light receiving unit based on the second fluorescence received by the light receiving unit;
A fluorescence inspection apparatus comprising: an inspection unit that inspects the first fluorescence corrected by the correction unit. A light source that irradiates excitation light to a medium that is symmetrical to the inspection;
A first light-receiving unit that receives first fluorescence emitted from a fluorescent substance contained in the medium based on excitation light emitted from the light source;
A main body having an irradiation surface to which excitation light from the light source is irradiated, and a light emission surface for emitting second fluorescence that is excited and emitted based on the excitation light irradiated through the irradiation surface; A fluorescent reference member comprising a light-absorbing material coated on all surfaces except the irradiation surface and the light-emitting surface;
A second light receiving portion for receiving the second fluorescence emitted through the light emitting surface of the fluorescence reference member;
A correction unit that corrects the output of the first light receiving unit based on the second fluorescence received by the second light receiving unit;
A fluorescence inspection apparatus comprising: an inspection unit that inspects the first fluorescence corrected by the correction unit. A light source that irradiates excitation light to a medium that is symmetrical to the inspection;
A main body having an irradiation surface irradiated with excitation light from the light source, a light emitting surface emitting fluorescence emitted based on the excitation light irradiated through the irradiation surface, and the irradiation surface of the main body And a fluorescent reference member comprising a light-absorbing material coated on all surfaces except the light-emitting surface,
A light receiving unit that selectively receives the first fluorescence emitted from the fluorescent material included in the medium and the second fluorescence emitted from the fluorescence reference member based on the excitation light emitted from the light source. When,
An inspection unit for inspecting the first fluorescence received by the light receiving unit;
A fluorescence inspection apparatus comprising: a correction unit that corrects the light emission amount of the light source based on the second fluorescence received by the light receiving unit. A light source that irradiates excitation light to a medium that is symmetrical to the inspection;
A first light-receiving unit that receives first fluorescence emitted from a fluorescent substance contained in the medium based on excitation light emitted from the light source;
An inspection unit for inspecting the first fluorescence received by the first light receiving unit;
A main body having an irradiation surface to which excitation light from the light source is irradiated, and a light emission surface for emitting second fluorescence that is excited and emitted based on the excitation light irradiated through the irradiation surface; A fluorescent reference member comprising a light-absorbing material coated on all surfaces except the irradiation surface and the light-emitting surface;
A second light receiving portion for receiving the second fluorescence emitted through the light emitting surface of the fluorescence reference member;
A fluorescence inspection apparatus, comprising: a correction unit that corrects the light emission amount of the light source based on the second fluorescence received by the second light receiving unit.   10. The fluorescence inspection apparatus according to claim 6, wherein all surfaces including an irradiation surface and a light emitting surface of the main body of the fluorescence reference member are optically polished.   11. The fluorescence inspection apparatus according to claim 6, wherein all surfaces except an irradiation surface and a light emitting surface of the main body of the fluorescent reference member are formed by a single curved surface.   The main body of the fluorescent reference member is formed in a polyhedron having the irradiation surface and the light emitting surface, and corners formed by all surfaces except the irradiation surface and the light emitting surface are chamfered. The fluorescence inspection apparatus according to any one of claims 10 to 10.   The fluorescence inspection apparatus according to any one of claims 6 to 9, wherein an irradiation surface and a light emission surface of the main body of the fluorescence reference member constitute the same surface.

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