WO2022168374A1 - 照射光学系、照射装置、及び、光学測定装置 - Google Patents
照射光学系、照射装置、及び、光学測定装置 Download PDFInfo
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- WO2022168374A1 WO2022168374A1 PCT/JP2021/038304 JP2021038304W WO2022168374A1 WO 2022168374 A1 WO2022168374 A1 WO 2022168374A1 JP 2021038304 W JP2021038304 W JP 2021038304W WO 2022168374 A1 WO2022168374 A1 WO 2022168374A1
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- light
- lens
- irradiation
- optical system
- photodetector
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- 230000003287 optical effect Effects 0.000 title claims abstract description 148
- 238000005259 measurement Methods 0.000 title description 64
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- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 24
- 239000003153 chemical reaction reagent Substances 0.000 description 13
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- 229920006324 polyoxymethylene Polymers 0.000 description 2
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- 229910052693 Europium Inorganic materials 0.000 description 1
- -1 Polyoxymethylene Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6463—Optics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6463—Optics
- G01N2021/6471—Special filters, filter wheel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7769—Measurement method of reaction-produced change in sensor
- G01N2021/7786—Fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8483—Investigating reagent band
Definitions
- the present disclosure relates to an irradiation optical system, an irradiation device, and an optical measurement device.
- Patent Literature 1 and Patent Literature 2 describe an optical section used in a sample concentration measuring device. These optical units include a semiconductor laser that serves as a light source, a collimating lens that converts the beam emitted from the semiconductor laser into a parallel beam, and a beam that has passed through the collimating lens and enters through an aperture and a beam splitter. It has a cylindrical lens leading to immunochromatographic strips and an optical bench that houses them.
- the beam emitted from the semiconductor laser is converted into a parallel beam through a collimating lens.
- This parallel beam enters the polarizing beam splitter through the aperture.
- the beam transmitted through the polarizing beam splitter enters a cylindrical lens, forms an image only in the longitudinal direction of the immunochromatographic test strip, and irradiates the immunochromatographic test strip with the image formed by the cylindrical lens.
- the beam emitted from the semiconductor laser is made elliptical by a cylindrical lens, or is made rectangular by using an aperture, and is irradiated to the immunochromatographic test piece to which the sample is added.
- the beam is elliptical or rectangular
- the illuminance distribution in the irradiation surface of the elliptical or rectangular beam is uniform. There is no mention of conversion, nor is there any configuration for that. Therefore, with the sample concentration measuring devices described in Patent Documents 1 and 2, it is difficult to achieve uniform light irradiation to the immunochromatographic test strip.
- An object of the present disclosure is to provide an irradiation optical system, an irradiation device, and an optical measurement device that enable more uniform light irradiation.
- An irradiation optical system is an irradiation optical system for irradiating a first light onto an object, and includes a surface emitting element that emits the first light from a light emitting surface, and a second light emitted from the surface emitting element.
- a light source including a lens portion for enhancing the directivity of light;
- a light shaping member and a first lens for forming an image of the first light emitted from the light shaping member on an object, wherein the light exit surface of the surface light emitting element and the light incident surface of the light shaping member is 26 times or less the size of the light exit surface in one direction.
- the first light emitted from the light source is shaped by the light shaping member and then irradiated onto the object through the first lens.
- the light source includes a surface light emitting element and a lens portion for enhancing directivity of the first light emitted from the surface light emitting element.
- the distance between the light exit surface of the surface light emitting element and the light incident surface of the light shaping member is 26 times or less the size of the light exit surface of the surface light emitting element in one direction.
- a surface light-emitting element used in combination with a lens portion for enhancing directivity in this way in a short distance range within 26 times the size of the light exit surface, relatively A high amount of light and a uniform illuminance distribution can be obtained. Therefore, by forming an image of the first light on the incident surface of the light shaping member arranged within the above distance range on the object by the first lens, the object can be irradiated with more uniform light. It becomes possible. Note that, for example, when the light emitting surface of the surface emitting element has a longitudinal direction, the size in one direction of the light emitting surface of the surface emitting element is the size in the longitudinal direction.
- the irradiation optical system according to the present disclosure may include a second lens arranged between the light source and the first lens for correcting aberrations occurring in the first lens. In this case, more uniform light irradiation becomes possible.
- the second lens is arranged between the light source and the light shaping member or between the light shaping member and the first lens, and the first light emitted from the light source is It may have a function of enhancing directivity. In this case, loss due to diffusion of the first light is reduced.
- the second lens may be fixed to the light shaping member. In this case, a separate mechanism for holding the second lens is not required.
- the light source includes a light-transmissive light-transmitting portion that seals the surface-emitting element, and the lens portion is formed in the light-transmitting portion and integrated with the surface-emitting element. good. In this case, handling and positioning of the surface light emitting device and the lens portion are facilitated.
- the irradiation optical system according to the present disclosure is provided between the light source and the first lens, and is a first wavelength selection device for selectively transmitting a portion of the wavelength components of the first light toward the first lens.
- a filter may be provided. In this case, it is possible to selectively irradiate the object with some wavelength components of the first light.
- An irradiation apparatus includes the irradiation optical system described above and a housing that accommodates the irradiation optical system, and the housing includes a first space in which an optical path of the first light is formed, and a first space and a first inner wall surface defining a section. According to this irradiation device, it is possible to obtain the same effects as the irradiation optical system described above. Moreover, according to this irradiation device, since the irradiation optical system is accommodated in the housing, the handling becomes easy.
- the first space is provided with a first widened portion that is widened between the light shaping member and the first lens, and the first inner wall surface is formed at the first widened portion. , a first intersection surface that intersects the optical path of the first light and faces the light shaping member. In this case, light traveling obliquely from the light shaping member toward the first lens at a certain angle or more is trapped by the first intersecting surface, thereby suppressing the generation of stray light.
- the irradiation device is installed on the first inner wall surface so as to face the optical path of the first light, detects a part of the first light emitted from the light source and diffused, and detects the first light emitted from the light source.
- a first photodetector may be provided for detecting the amount of light of one light. In this case, it is possible to monitor the light amount of the first light.
- the irradiation device may include a driving circuit for driving the surface emitting element so that the light intensity is constant while inputting a detection signal indicating the light intensity of the first light from the first photodetector. good. In this case, it is possible to irradiate light with a stable amount of light.
- the housing may be made of a material that absorbs the first light.
- the housing may be made of a material that does not generate autofluorescence due to the first light. In these cases, the generation of stray light is more reliably suppressed.
- An optical measurement device includes the irradiation device described above and a detection optical system for detecting the second light from the object irradiated with the first light, and the housing includes the detection optical system. Further, the detection optical system includes a second space portion in which an optical path of the second light is formed, and a second inner wall surface defining the second space portion. Two photodetectors and a third lens for focusing the second light onto the second photodetectors. According to this optical measurement apparatus, the object can be measured stably by detecting the second light from the object that has been uniformly irradiated with light by the irradiation optical system and the irradiation device.
- the optical measurement device is provided between the third lens and the second photodetector, and selectively transmits some wavelength components of the second light toward the second photodetector.
- a second wavelength selective filter may be provided for. In this case, it is possible to selectively detect some wavelength components of the second light.
- the second space is formed with the second widened portion that is widened between the third lens and the second wavelength selection filter, and the second inner wall surface is the second
- the widened portion may include a second intersection surface that intersects the optical path of the second light and faces the third lens side.
- light traveling obliquely from the third lens toward the second wavelength selection filter at an angle of a certain angle or more is trapped by the second intersecting surface, thereby allowing the second light to enter the second wavelength selection filter.
- Limited angular range As a result, the influence of the incident angle dependence of the characteristics of the second wavelength selection filter is reduced, and highly accurate measurement becomes possible.
- the second wavelength selection filter may include a dielectric multilayer filter and a colored glass filter arranged closer to the second photodetector than the dielectric multilayer filter. In this case, the incident angle dependence of the characteristics of the second wavelength selection filter is reduced.
- An optical measurement device includes a current-voltage converter for converting a current signal output from the second photodetector in response to detection of the second light into a voltage signal, the second photodetector: It may be mounted on the board of the current-voltage converter. In this case, noise is reduced.
- the optical measurement device may include a metal shield provided on the housing so as to cover at least the second photodetector and the current-voltage converter. In this case, noise is reduced.
- the first light may contain excitation light for exciting the object
- the second light may contain fluorescence emitted by the object in response to irradiation with the excitation light. In this case, stable fluorescence measurement becomes possible.
- an irradiation optical system an irradiation device, and an optical measurement device that enable more uniform light irradiation.
- FIG. 1 is a schematic configuration diagram of an optical measuring device according to this embodiment.
- FIG. 2 is a diagram showing an example of the test piece shown in FIG. 1 and detection results.
- FIG. 3 is a schematic side view showing the interior of part of the optical measurement device shown in FIG.
- FIG. 4 is a schematic side view from another direction showing the interior of part of the optical measurement apparatus shown in FIG. 5 is a side view of the light source shown in FIGS. 3 and 4;
- FIG. FIG. 6 is a graph showing the illuminance distribution of the irradiation light on the irradiation surface at a specific distance from the light emitting surface of the surface emitting element.
- FIG. 7 is a graph showing the illuminance distribution of irradiation light on an irradiation surface at a specific distance from the light emitting surface of the surface light emitting element. It is a figure which shows the light quantity of the irradiation light which concerns on this embodiment. It is a figure which shows the light quantity of the detection light which concerns on this embodiment.
- FIG. 1 is a schematic configuration diagram of an optical measurement device according to this embodiment.
- the optical measurement device 1 shown in FIG. 1 is a device that detects light emitted from a sample according to the light irradiated on the sample.
- the optical measurement device 1 is described as a fluorescence measurement device that detects fluorescence generated from a sample in response to excitation light applied to the sample.
- Excitation light is light that excites a sample
- fluorescence is light that is emitted by a sample in response to excitation light and has a wavelength different from the wavelength of the excitation light.
- the optical measurement device 1 is described as a device that detects fluorescence related to measurement using immunochromatography. Immunochromatography is an immunoassay method using an antigen-antibody reaction, and is used, for example, for detection of influenza virus.
- FIG. 2 is a diagram showing an example of the test piece shown in FIG. 1 and detection results.
- an immunochromatography test piece 500 is prepared as a sample for measurement using the immunochromatography method.
- Immunochromatographic test strip 500 includes a reagent holder 500A in which a dropping portion 502 for dropping a specimen, a holding portion 503 for holding a detection antibody labeled with a fluorescent reagent, and a measurement target portion 504 for capturing a capturing antibody are used for measurement.
- a part (target object) 501 is arranged from upstream to downstream.
- a fluorescent reagent is, for example, europium.
- the measurement unit 501 which is the measurement region, is irradiated with the excitation light while changing the condensing position (measurement position), thereby deriving the detected light intensity (fluorescence intensity) according to the measurement position.
- a measurement position where the detected light intensity is larger than others is a measurement position corresponding to the position of the measurement target part 504 where the complex is captured.
- the measurement area is on the line, and fluorescent substances are also floating in areas other than the line (background), so if the illuminance distribution of the excitation light is uneven within the irradiation surface, stable measurement becomes difficult.
- the amount of fluorescent substance present in the line itself differs depending on the position, and the distribution of fluorescence emission may be uneven, which also makes stable measurement difficult. Therefore, for stable measurement, it is desirable to make the illuminance distribution of the excitation light more uniform.
- the detection light detected by the detection optical system of the optical measurement device 1 includes not only fluorescence but also light caused by the excitation light itself.
- Such light includes, for example, scattered light of excitation light.
- scattered light is, for example, part of the excitation light generated when the immunochromatography test strip 500 is irradiated with the excitation light and scattered.
- the immunochromatographic membrane of the immunochromatographic test strip 500 and the reagent holder 500A are white, the scattered light is likely to occur.
- the excitation light itself may be detected. Therefore, it is also desired to suppress stray light other than fluorescence to be detected.
- the optical measuring device 1 comprises an optical head 10.
- the optical head 10 includes an irradiation optical system C1 and a detection optical system C2.
- the irradiation optical system C1 is for irradiating the immunochromatography test piece 500 with irradiation light (first light) L1.
- the irradiation light L1 includes excitation light that excites the fluorescent reagent of the immunochromatographic test strip 500 .
- the irradiation light L1 is, for example, ultraviolet light containing a wavelength component of 340 nm.
- the detection optical system C2 is for detecting the detection light (second light) L2 from the immunochromatography test piece 500.
- FIG. The detection light L2 includes fluorescence from the fluorescent reagent of the immunochromatographic test strip 500.
- the irradiation optical system C ⁇ b>1 has a light source 101 , a first lens 111 , a second lens 112 , a light shaping member 120 , a first wavelength selection filter 125 and a first photodetector 140 .
- the light source 101, the first lens 111, the second lens 112, the light shaping member 120, the first wavelength selection filter 125, and the first photodetector 140 are accommodated and held in the housing 130, The housing 130 together constitutes the irradiation device 100 .
- the light source 101 includes a light emitting surface 102s, and includes a surface light emitting element 102 that emits irradiation light L1 from the light emitting surface 102s, and a lens portion 103b that enhances the directivity of the irradiation light L1 emitted from the surface light emitting element 102.
- the surface emitting element 102 is, for example, an LED (Light Emitting Diode).
- the light emitting surface 102s is, for example, an area in one end surface of the surface light emitting element 102 from which the irradiation light L1 is emitted (in the illustrated example, this is the entire one end surface of the surface light emitting element 102).
- the sealing portion 103a and the lens portion 103b are integrally formed of a light-transmitting material that transmits the irradiation light L1, such as a light-transmitting resin, and seals the surface light emitting element 102 and the reflector 104.
- a resin portion (light-transmitting portion) 103 for stopping is configured.
- the lens portion 103b is formed on the light-transmissive resin portion 103 so as to be convex on the side opposite to the surface light emitting element 102 and integrated with the surface light emitting element 102 .
- the light source 101 is configured as a cannonball-shaped LED when the surface emitting element 102 is an LED.
- the light shaping member 120 includes a light incident surface 121 on which the irradiation light L1 emitted from the light source 101 is incident and a slit 120s which is a light passage hole. emit. 120 s of slits are opened in the light-incidence surface 121.
- the shape of the slit 120s when viewed from the direction along the optical axis of the irradiation light L1 is a shape corresponding to the shape of the measurement target portion 504, and is, for example, a rectangular shape having a longitudinal direction.
- the light shaping member 120 is arranged such that its light incident surface 121 is at a distance H from the light emitting surface 102 s of the surface emitting element 102 .
- the distance H between the light exit surface 102s and the light entrance surface 121 is 26 times or less the size d of the light exit surface 102s in one direction.
- the size d in one direction of the light exit surface 102s is the size of one side of the square. is the size in the longitudinal direction. In the latter case, the distance H is also less than 26 times the width of the light exit surface 102s.
- the size d is 0.5 mm as an example.
- the irradiation light L1 emitted from the light shaping member 120 is incident on the first lens 111 through the slit 120s.
- the first lens 111 is, for example, a spherical lens that is convex on the side of the light shaping member 120 and on the side opposite to the light shaping member 120, and is immune to the image of the slit 120s, which is the image of the irradiation light L1 emitted from the light shaping member. It is arranged so as to be imaged onto the chromatographic test strip 500 .
- the second lens 112 is arranged between the light source 101 and the first lens 111 .
- the second lens 112 is arranged between the light source 101 and the light shaping member 120 and fixed to the light shaping member 120 .
- the second lens 112 has at least a function of correcting aberration (for example, spherical aberration) occurring in the first lens 111 .
- the second lens 112 further has a function of enhancing the directivity of the irradiation light L1.
- the second lens 112 is, for example, a lens that is convex toward the light source 101 side.
- the first wavelength selection filter 125 is provided between the light source 101 and the first lens 111 to selectively transmit a part of the wavelength components of the irradiation light L1 toward the first lens 111. be.
- the first wavelength selection filter 125 is configured, for example, to selectively transmit a wavelength component (excitation light) of the illumination light L1 that contributes to excitation of the fluorescent reagent.
- the first wavelength selection filter 125 may be configured by, for example, vapor-depositing a dielectric multilayer filter on the first lens 111 that transmits only a specific wavelength band (the excitation wavelength of the fluorescent reagent).
- the housing 130 includes a first space 131 in which the optical path of the irradiation light L1 is formed, and a first inner wall surface 132 defining the first space 131 .
- the housing 130 is solid except for the first space portion 131 and a second space portion 171 which will be described later. In other words, in the housing 130, the first space portion 131 and the second space portion 171 are formed in the solid body portion 130A.
- Each member of the irradiation optical system C1 is arranged in the first space 131 and held by the first inner wall surface 132 .
- the housing 130 is made of a material that absorbs at least the irradiation light L1.
- the housing 130 is also made of a material that does not generate autofluorescence due to the irradiation light L1.
- the material of the housing 130 is, for example, black ABS resin or black POM (Polyoxymethylene).
- the first photodetector 140 is installed, for example, on the first inner wall surface 132 between the light source 101 and the light shaping member 120 so as to face the optical path of the irradiation light L1.
- the first photodetector 140 is for detecting the amount of the irradiation light L1 emitted from the light source 101 by detecting part of the irradiation light L1 emitted from the light source 101 and diffused.
- the first photodetector 140 is, for example, a photodiode (Si photodiode as an example).
- the first photodetector 140 outputs a signal indicating the detection result to the drive circuit 50, which will be described later.
- a first widened portion 133 that is widened between the light shaping member 120 and the first lens 111 is formed in the first space portion 131 .
- the first widened portion 133 is provided between the light shaping member 120 and the first wavelength selection filter 125 .
- the first widened portion 133 is formed by recessing the first inner wall surface 132 away from the optical path of the irradiation light L1.
- the width of the first widened portion 133 is constant.
- the first widened portion 133 has, for example, a rectangular parallelepiped shape.
- the first inner wall surface 132 includes a pair of intersecting surfaces 134 and 135 that intersect the optical path of the irradiation light L1 (the direction from the light shaping member 120 toward the first lens 111) at the first widened portion 133.
- the intersection surface 134 is a surface facing the first lens 111 side
- the intersection surface (first intersection surface) 135 is a surface facing the light shaping member 120 side.
- the intersecting surface 134 and the intersecting surface 135 are surfaces facing each other, and are parallel to each other as an example.
- the detection optical system C2 has a second photodetector 150, a third lens 153, and a second wavelength selection filter 160.
- the second photodetector 150 , the third lens 153 , and the second wavelength selection filter 160 are housed in and held by the housing 130 .
- the second photodetector 150 is for detecting the detection light L2.
- the second photodetector 150 is, for example, a photodiode (Si photodiode as an example).
- the second photodetector 150 may be an avalanche photodiode or photomultiplier tube and a multi-pixel array thereof.
- a substrate 21 of the current-voltage converter 20 which will be described later, is attached to the outer surface of the housing 130 , and the second photodetector 150 is mounted on the substrate 21 .
- the second photodetector 150 outputs to the current-voltage converter 20 a signal indicating the detection result of the detection light L2.
- the third lens 153 is for condensing the detection light L2 toward the second photodetector 150 .
- the third lens 153 is, for example, a plano-convex lens that is convex on the side opposite to the second photodetector 150 .
- the second wavelength selection filter 160 is arranged between the third lens 153 and the second photodetector 150 .
- the second wavelength selection filter 160 is for selectively transmitting some wavelength components of the detection light L2 toward the second photodetector 150 .
- the second wavelength selection filter 160 is configured, for example, to selectively transmit fluorescence generated from a fluorescent reagent in the detection light L2.
- the second wavelength selection filter 160 here includes a dielectric multilayer filter 161 and a colored glass filter 162 that transmit only a specific wavelength band (fluorescence).
- the second wavelength selection filter 160 is, for example, a bandpass filter that combines a dielectric multilayer filter 161 and a colored glass filter 162 .
- the colored glass filter 162 is arranged closer to the second photodetector 150 than the dielectric multilayer filter 161 . As an example, the colored glass filter 162 is adhered to the dielectric multilayer filter 161 .
- the housing 130 includes a second space 171 in which the optical path of the detection light L2 is formed, and a second inner wall surface 172 defining the second space 171 .
- Each member of the detection optical system C2 is arranged in the second space 171 and held by the second inner wall surface 172 .
- a second widened portion 173 that is widened between the third lens 153 and the second wavelength selection filter 160 is formed in the second space portion 171 .
- the second widened portion 173 is formed by recessing the second inner wall surface 172 away from the optical path of the detection light L2.
- the width of the second widened portion 173 is constant.
- the second widened portion 173 has, for example, a rectangular parallelepiped shape.
- the second inner wall surface 172 includes a pair of intersecting surfaces 174 and 175 intersecting the optical path of the detection light L2 (the direction from the third lens 153 to the second photodetector 150) at the second widened portion 173. As shown in FIG.
- intersection surface (second intersection surface) 174 is a surface facing the third lens 153 side
- intersection surface 175 is a surface facing the second wavelength selection filter 160 side.
- the intersecting surface 174 and the intersecting surface 175 are surfaces facing each other, and are parallel to each other as an example. If the second space 171 does not have the second widened portion 173 , the second wavelength selection filter 160 may be formed by depositing the dielectric multilayer filter 161 on the third lens 153 .
- the optical measurement device 1 further includes a current-voltage converter 20, an AD converter 30, a CPU 40, and a drive circuit 50.
- the current-voltage converter 20 converts the current signal output from the second photodetector 150 into a voltage signal and outputs the voltage signal to the AD converter 30 .
- the substrate 21 of the current-voltage converter 20 is attached to the outer surface of the housing 130 (see FIG. 3).
- the AD converter 30 converts the voltage signal output from the current-voltage converter 20 into a digital signal and outputs the digital signal to the CPU 40 .
- the CPU 40 performs signal processing on the digital signal output from the AD converter 80, for example, to remove a signal component corresponding to scattered light from the detection signal.
- the drive circuit 50 receives input from the CPU 40 and also receives input from the first photodetector 140 .
- the drive circuit 50 receives from the first photodetector 140 a detection signal indicating the light intensity of the irradiation light L1 from the first photodetector 140, and controls driving of the surface light emitting element 102 so that the light intensity is constant. do. [Action/Effect]
- the irradiation light L1 emitted from the light source 101 is shaped by the light shaping member 120 and then irradiated onto the immunochromatographic test piece 500 via the first lens 111.
- the light source 101 includes a surface light emitting element 102 and a lens portion 103b for enhancing the directivity of the irradiation light L1 emitted from the surface light emitting element 102.
- the distance H between the light exit surface 102s of the surface light emitting element 102 and the light incident surface 121 of the light shaping member 120 is 26 times or less the size d of the light exit surface 102s of the surface light emitting element 102 in one direction.
- 6 and 7 are graphs LA showing the illuminance distribution of the irradiated light on the irradiated surface at a specific distance from the light emitting surface of the surface emitting element.
- 6 and 7 are examples in which the size d is 0.5 mm.
- FIG. 8 (a) of FIG. 8 is a diagram showing the light amount of the irradiation light L1 imaged by the irradiation optical system C1 according to the present embodiment.
- FIG. 8(b) is a diagram showing a simulated light amount of the irradiation light L1 imaged by the irradiation optical system C1 according to this embodiment.
- the irradiation light L1 is shaped by the light shaping member 120 installed in the above distance range, and is imaged by the first lens 111, so that the immunochromatography test piece 500 is more Uniform light irradiation becomes possible.
- the image of the irradiation light L1 (the image of the slit 120s) on the light incident surface 121 of the light shaping member 120 arranged within the above distance range is By forming an image on the immunochromatographic test strip 500 with one lens 111, it is possible to irradiate the immunochromatographic test strip 500 with more uniform light. The same effects can be obtained with the irradiation device 100 including the irradiation optical system C1 and the optical measurement device 1 as well.
- the optical measurement device 1 detects the detection light L2 from the immunochromatography test strip 500 (fluorescent reagent) that has been uniformly irradiated with light by the irradiation optical system C1 and the irradiation device 100, thereby performing stable measurement. It becomes possible.
- the irradiation optical system C1 also includes a second lens 112 arranged between the light source 101 and the first lens 111 for correcting aberration caused by the first lens 111 . Therefore, more uniform light irradiation becomes possible.
- the second lens 112 is arranged between the light source 101 and the light shaping member 120, and has a function of enhancing the directivity of the irradiation light L1 emitted from the light source 101. have. Therefore, the loss caused by the irradiation light L1 striking the first inner wall surface 132 and being absorbed by the diffusion of the irradiation light L1 is reduced.
- the second lens 112 is fixed to the light shaping member 120 . This eliminates the need for a separate mechanism for holding the second lens 112 and for positioning.
- the light source 101 includes a light-transmitting resin portion 103 that seals the surface light emitting element 102, and the lens portion 103b is formed in the resin portion 103 to form the surface light emitting element. 102 are integrated. Therefore, handling and positioning of the surface light emitting element 102 and the lens portion 103b are facilitated.
- the irradiation optical system C1 is provided between the light source 101 and the first lens 111, and selectively transmits some wavelength components of the irradiation light L1 toward the first lens 111.
- a first wavelength selective filter 125 is provided for. Therefore, it is possible to selectively irradiate the immunochromatographic test strip 500 with a part of the wavelength components of the irradiation light L1.
- the irradiation device 100 includes the above irradiation optical system C1 and a housing 130 that houses the irradiation optical system C1.
- the housing 130 includes a first space 131 in which the optical path of the irradiation light L1 is formed, and a first inner wall surface 132 defining the first space 131 .
- this irradiation device 100 as described above, it is possible to achieve the same effects as the irradiation optical system C1. Further, according to the irradiation apparatus 100, the irradiation optical system C1 is accommodated in the housing, so that it is easy to handle.
- the first space portion 131 is formed with the first widened portion 133 widened between the light shaping member 120 and the first lens 111, and the first inner wall surface 132 is , the first widened portion 133 includes an intersection surface 135 that intersects the optical path of the irradiation light L1 and faces the light shaping member 120 side. Therefore, light traveling obliquely from the light shaping member 120 toward the first lens 111 at a certain angle or more is trapped by the intersecting surface 135, thereby suppressing the generation of stray light. That is, the first widened portion 133 and the intersecting surface 135 function as a structure for trapping stray light.
- the first widened portion 133 is provided between the light shaping member 120 and the first wavelength selection filter 125 .
- the first wavelength selection filter 125 is arranged after the first widened portion 133 in the optical path of the irradiation light L1. Therefore, light traveling obliquely toward the first wavelength selection filter 125 at an angle of a certain angle or more is trapped by the intersecting surface 135, and as a result, the incident angle of the irradiation light L1 to the first wavelength selection filter is limited.
- the first wavelength selection filter 125 may include a dielectric multilayer filter, but in this case, if the incident angle of the irradiation light L1 to the dielectric multilayer filter increases, the filtering characteristics may deteriorate. . Therefore, by limiting the incident angle to the first wavelength selection filter 125 by the first widened portion 133 and the intersection surface 135 as described above, deterioration of filtering characteristics in the first wavelength selection filter 125 is suppressed, and the irradiation light L1 It is possible to more reliably selectively transmit only some of the wavelength components (suppress the generation of stray light).
- the effect of suppressing stray light by the first widened portion 133 and the intersection surface 135 is particularly effective when the first wavelength selection filter 125 including a dielectric multilayer filter is provided on the subsequent stage side, it is limited to that case. Instead, it can be exhibited simply by trapping light that travels obliquely in the first space 131 at a certain angle or more.
- the irradiation device 100 is installed on the first inner wall surface 132 so as to face the optical path of the irradiation light L1.
- a first photodetector 140 for detecting the amount of the irradiation light L1 emitted from the light source 101 is provided. Therefore, it is possible to monitor the light intensity of the irradiation light L1.
- the irradiation device 100 inputs a detection signal indicating the light quantity of the irradiation light L1 from the first photodetector 140, and drives the surface light emitting element 102 so that the light quantity is constant.
- a drive circuit 50 is provided. Therefore, it is possible to irradiate light with a stable amount of light.
- the housing 130 may be made of a material that absorbs the irradiation light L1.
- the housing 130 may be made of a material that does not generate autofluorescence by the irradiation light L1. In these cases, the generation of stray light is more reliably suppressed.
- the optical measurement apparatus 1 includes the above-described irradiation device 100 and a detection optical system for detecting the detection light L2 from the immunochromatographic test strip 500 (fluorescent reagent) irradiated with the irradiation light L1. and C2.
- the housing 130 further accommodates the detection optical system C2, and includes a second space 171 in which the optical path of the detection light L2 is formed, and a second inner wall surface 172 defining the second space 171 .
- the detection optical system C2 includes a second photodetector 150 for detecting the detection light L2 and a third lens 153 for condensing the detection light L2 toward the second photodetector 150. .
- this optical measurement device by detecting the detection light L2 from the immunochromatographic test piece 500 that has been uniformly irradiated with light by the irradiation optical system C1 and the irradiation device 100, the immunochromatographic test piece 500 is stabilized. measurement is possible.
- the optical measurement apparatus 1 is provided between the third lens 153 and the second photodetector 150, and transmits a part of the wavelength components of the detection light L2 to the second photodetector 150.
- a second wavelength selective filter 160 is provided for selectively transmitting the light toward the light source. Therefore, it is possible to selectively detect some wavelength components of the detection light L2.
- the second space 171 is formed with a second widened portion 173 widened between the third lens 153 and the second wavelength selection filter 160.
- the second inner wall surface 172 includes an intersecting surface 174 that intersects the optical path of the detection light L2 and faces the third lens 153 at the second widened portion 173 . Therefore, light traveling obliquely from the third lens 153 toward the second wavelength selection filter 160 at a certain angle or more is trapped by the intersecting surface 174, so that the detection light L2 incident on the second wavelength selection filter 160 is detected. range of incident angles is limited.
- the second wavelength selection filter 160 since the second wavelength selection filter 160 includes the dielectric multilayer filter 161, it has incident angle dependency of filtering characteristics. Therefore, by limiting the incident angle to the second wavelength selection filter 160 by the second widened portion 173 and the intersection surface 174 as described above, deterioration of filtering characteristics in the second wavelength selection filter 160 is suppressed, and the detection light L2 It is possible to more reliably selectively transmit only some of the wavelength components (suppress the generation of stray light). Therefore, highly accurate measurement is possible.
- FIG. 9A shows the amount of detection light L2 on the light receiving surface of the second photodetector 150 when the stray light trapping structure of the second widened portion 173 and the intersecting surface 174 is not provided.
- 9(b) shows the light amount of the detection light L2 on the detection surface of the second photodetector 150 when the second widened portion 173 and the intersection surface 174 have a stray light trap structure.
- FIG. 9 by using the stray light trap structure according to the present embodiment the noise due to stray light is reduced and uniform detection results are obtained.
- the effect of suppressing stray light by the second widened portion 173 and the intersection plane 174 is particularly effective when the second wavelength selection filter 160 including the dielectric multilayer filter 161 is provided on the subsequent stage side, It is not limited to this, and can be exhibited simply by trapping light that travels obliquely in the second space 171 at a certain angle or more.
- the second wavelength selection filter 160 includes the dielectric multilayer filter 161 and the colored glass arranged closer to the second photodetector 150 than the dielectric multilayer filter 161. and a filter 162 .
- the characteristics of dielectric multilayer filters have incident angle dependence.
- the colored glass filter 162 by providing the colored glass filter 162, the incident angle dependence of the second wavelength selection filter 160 as a whole is reduced, and a part of the wavelengths can be more effectively detected for a wider range of incident angles. It becomes possible to selectively permeate only the component. In particular, it is more effective to arrange the dielectric multilayer filter 161 and the colored glass filter 162 in this order toward the second photodetector 150 .
- the optical measurement apparatus 1 includes a current-voltage converter 20 for converting a current signal output from the second photodetector 150 in response to detection of the detection light L2 into a voltage signal.
- the two photodetectors 150 are mounted on the substrate 21 of the current-voltage converter 20 . Therefore, it is avoided that noise is added to the detection signal between the second photodetector 150 and the current-voltage converter 20, and the noise is reduced.
- the illumination light L1 includes excitation light for exciting the immunochromatographic test strip 500 (fluorescent reagent), and the detection light L2 is emitted from the immunochromatographic test strip 500 in response to the irradiation of the excitation light. contains fluorescence emitted by (fluorescent reagent). Therefore, stable fluorescence measurement becomes possible.
- the present disclosure is not limited to the above-described embodiments, and may be arbitrarily modified from the irradiation optical system C1, the irradiation device 100, and the optical measurement device 1 described above.
- the optical measurement device 1 described above may include a metal shield provided on the housing 130 so as to cover at least the second photodetector 150 and the current-voltage converter 20 .
- the metal shield can be provided so as to cover the entire side surface of the housing 130 . In this case, noise is further reduced.
- the second lens 112 may be arranged between the light shaping member 120 and the first lens 111 . Even in this case, the second lens 112 may be fixed to the light shaping member 120 . However, the second lens 112 may be fixed to the housing 130 separately from the light shaping member 120 .
- the shape of the light passing hole of the light shaping member 120 when viewed from the direction along the optical axis of the irradiation light L1 corresponds to the shape of the measurement target portion 504
- the longitudinal direction of the slit 120s is The shape is not limited to a rectangular shape, and may be other shapes (for example, circular or elliptical).
- the first wavelength selection filter 125 and the second wavelength selection filter 160 are not limited to the configurations described above, and may be arbitrarily changed.
- the first wavelength selection filter 125 also includes a dielectric multilayer filter and a colored glass filter (for example, arranged closer to the first lens 111 than the dielectric multilayer filter). It may contain only colored glass filters.
- the second wavelength selection filter 160 may also include only one of the dielectric multilayer filter 161 and the colored glass filter 162 .
- the light source 101 is not limited to the case where the surface emitting element 102 and the lens portion 103b are integrated as a bullet-shaped LED, and the surface emitting element 102 and the lens portion 103b may be configured separately. good.
- the optical measurement device 1 used for fluorescence immunochromatography was described, but the optical measurement device 1 can be used for other purposes.
- the irradiation light L1 may not contain the excitation light for exciting the object
- the detection light L2 may not contain the fluorescence emitted from the object due to irradiation with the excitation light.
- an irradiation optical system an irradiation device, and an optical measurement device that enable more uniform light irradiation.
- Optical measuring apparatus 20... Current-voltage converter 50... Drive circuit 100
- Irradiation apparatus 101... Light source 102... Surface light-emitting element 102s... Light-emitting surface 103... Resin part (translucent part) 103b 111 First lens 112 Second lens 120
Abstract
Description
[光学測定装置の構成]
[作用・効果]
Claims (19)
- 対象物に第1光を照射するための照射光学系であって、
光出射面から前記第1光を出射する面発光素子と、前記面発光素子から出射された前記第1光の指向性を高めるためのレンズ部とを含む光源と、
前記光源から出射された前記第1光を光入射面から入射し、入射した前記第1光を光通過孔により整形して出射するための光整形部材と、
前記光整形部材から出射された前記第1光の像を前記対象物に結像するための第1レンズと、
を備え、
前記面発光素子の光出射面と前記光整形部材の光入射面との距離は、前記光出射面の一方向についての大きさの26倍以下である、
照射光学系。 - 前記光源と前記第1レンズとの間に配置され、前記第1レンズで生じる収差を補正するための第2レンズを備える、
請求項1に記載の照射光学系。 - 前記第2レンズは、前記光源と前記光整形部材との間、または、前記光整形部材と前記第1レンズとの間に配置されており、前記光源から出射された前記第1光の指向性を高める機能を有する、
請求項2に記載の照射光学系。 - 前記第2レンズは、前記光整形部材に固定されている、
請求項2又は3に記載の照射光学系。 - 前記光源は、前記面発光素子を封止する光透過性の透光部を含み、
前記レンズ部は、前記透光部に形成されて前記面発光素子と一体化されている、
請求項1~4のいずれか一項に記載の照射光学系。 - 前記光源と前記第1レンズとの間に設けられ、前記第1光のうちの一部の波長成分を前記第1レンズに向けて選択的に透過するための第1波長選択フィルタを備える、
請求項1~5のいずれか一項に記載の照射光学系。 - 請求項1~6のいずれか一項に記載の照射光学系と、
前記照射光学系を収容する筐体と、
を備え、
前記筐体は、
前記第1光の光路が形成される第1空間部と、
前記第1空間部を画定する第1内壁面と、
を含む、
照射装置。 - 前記第1空間部には、前記光整形部材と前記第1レンズとの間において拡幅された第1拡幅部が形成されており、
前記第1内壁面は、前記第1拡幅部において、前記第1光の光路に交差すると共に前記光整形部材側に臨む第1交差面を含む、
請求項7に記載の照射装置。 - 前記第1光の光路に臨むように前記第1内壁面に設置され、前記光源から出射されて拡散する前記第1光の一部を検出することにより、前記光源から出射された前記第1光の光量を検知するための第1光検出器を備える、
請求項7又は8に記載の照射装置。 - 前記第1光の光量を示す検出信号を前記第1光検出器から入力しつつ、当該光量が一定となるように前記面発光素子を駆動するための駆動回路を備える、
請求項9に記載の照射装置。 - 前記筐体は、前記第1光に対して吸収性を有する材料からなる、
請求項7~10のいずれか一項に記載の照射装置。 - 前記筐体は、前記第1光により自家蛍光が生じない材料からなる、
請求項7~11のいずれか一項に記載の照射装置。 - 請求項7~12のいずれか一項に記載の照射装置と、
前記第1光が照射された前記対象物からの第2光を検出するための検出光学系と、
を備え、
前記筐体は、前記検出光学系をさらに収容すると共に、
前記第2光の光路が形成される第2空間部と、
前記第2空間部を画定する第2内壁面と、
を含み、
前記検出光学系は、
前記第2光を検出するための第2光検出器と、
前記第2光を前記第2光検出器に向けて集光するための第3レンズと、
を備える光学測定装置。 - 前記第3レンズと前記第2光検出器との間に設けられ、前記第2光のうちの一部の波長成分を前記第2光検出器に向けて選択的に透過するための第2波長選択フィルタを備える、
請求項13に記載の光学測定装置。 - 前記第2空間部には、前記第3レンズと前記第2波長選択フィルタとの間において拡幅された第2拡幅部が形成されており、
前記第2内壁面は、前記第2拡幅部において、前記第2光の光路に交差すると共に前記第3レンズ側に臨む第2交差面を含む、
請求項14に記載の光学測定装置。 - 前記第2波長選択フィルタは、誘電体多層膜フィルタと、前記誘電体多層膜フィルタよりも前記第2光検出器側に配置された色ガラスフィルタと、を含む、
請求項14又は15に記載の光学測定装置。 - 前記第2光の検出に応じて前記第2光検出器から出力される電流信号を電圧信号に変換するための電流電圧変換器を備え、
前記第2光検出器は、前記電流電圧変換器の基板に実装されている、
請求項13~16のいずれか一項に記載の光学測定装置。 - 少なくとも前記第2光検出器及び前記電流電圧変換器を覆うように前記筐体に設けられた金属シールドを備える、
請求項17に記載の光学測定装置。 - 前記第1光は、前記対象物を励起するための励起光を含み、
前記第2光は、前記励起光の照射に応じて前記対象物が放出する蛍光を含む、
請求項13~18のいずれか一項に記載の光学測定装置。
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WO2017199510A1 (ja) * | 2016-05-19 | 2017-11-23 | 浜松ホトニクス株式会社 | 蛍光測定装置の校正用基準体 |
JP2020115156A (ja) * | 2018-10-25 | 2020-07-30 | 浜松ホトニクス株式会社 | 光学測定装置及び光学測定方法 |
CN210984098U (zh) * | 2019-11-13 | 2020-07-10 | 舜宇光学(浙江)研究院有限公司 | Micro LED显示装置和微投影系统 |
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KR20230137907A (ko) | 2023-10-05 |
CN116848396A (zh) | 2023-10-03 |
JP2022118476A (ja) | 2022-08-15 |
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TW202232081A (zh) | 2022-08-16 |
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