WO2015199054A1 - 多波長光電測定装置、共焦点測定装置、干渉測定装置及びカラー測定装置 - Google Patents
多波長光電測定装置、共焦点測定装置、干渉測定装置及びカラー測定装置 Download PDFInfo
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- WO2015199054A1 WO2015199054A1 PCT/JP2015/067968 JP2015067968W WO2015199054A1 WO 2015199054 A1 WO2015199054 A1 WO 2015199054A1 JP 2015067968 W JP2015067968 W JP 2015067968W WO 2015199054 A1 WO2015199054 A1 WO 2015199054A1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light by interferometric means
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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Definitions
- the present invention provides a confocal displacement meter, an interference displacement meter, a color optical sensor, and the like that can measure a feature quantity such as thickness, distance, displacement, and color of a measurement object using light of multiple wavelengths such as white.
- the present invention relates to a multi-wavelength photoelectric measurement apparatus.
- the photoelectric measuring device projects visible light, infrared light, or the like from a light projecting unit, and detects reflected light reflected by the surface of the measurement object or transmitted light transmitted through the measurement object by the light receiving unit.
- the measurement unit performs feature quantities such as thickness, distance, displacement, color, and the like of the measurement object according to the light intensity distribution for each wavelength in the light receiving unit (see Patent Documents 1 to 4). *
- a white light source such as a halogen lamp or a xenon lamp, a white LED, an SLD (super luminescent diode) or the like is used as a light source.
- white light sources such as halogen lamps and xenon lamps have a problem in that they have a short lifetime, and even when white LEDs are used, white LEDs have a small amount of light emission per unit area. There is a problem in that the amount of light irradiated to the light source is small, the measurable measurement object is limited, and the thickness, distance, etc. of the measurement object cannot be detected with high accuracy.
- the present invention has been made in view of such circumstances, and it is possible to measure feature quantities such as thickness, distance, displacement, and color of a measurement object with high accuracy using light of multiple wavelengths such as white.
- An object is to provide a multi-wavelength photoelectric measurement device, a confocal measurement device, an interference measurement device, and a color measurement device.
- a multi-wavelength photoelectric measurement apparatus includes a laser light source, a light source optical member for condensing light from the laser light source, and light collected by the light source optical member. And a light comprising one or a plurality of optical fibers, each having the phosphor excited at the one end and receiving the light emitted from the phosphor from one end and propagating the light received from the other end A fiber part, a head optical member for condensing the light emitted from the other end of the optical fiber part toward the measurement object, and selectively receiving the light from the measurement object according to the wavelength; A light receiving element that performs photoelectric conversion into a signal corresponding to the amount; and a measurement control unit that measures a characteristic amount of the measurement object based on a signal indicating the amount of light received according to the wavelength from the light receiving element. . *
- the phosphor is fixed in a light-transmitting medium that transmits light from the laser light source and light emitted from the phosphor,
- the light transmissive medium is fixed to the one end of the optical fiber portion.
- the multi-wavelength photoelectric measurement apparatus is the first or second aspect of the present invention, wherein light from the laser light source is transmitted between the phosphor and the light source optical member, and the phosphor
- the optical filter further includes an optical filter that reflects light emitted from the light source.
- the multi-wavelength photoelectric measurement device according to any one of the first to third aspects, wherein an opening having a shape corresponding to an optical path of light incident on the one end of the optical fiber portion is formed.
- the opening further includes a frame for accommodating the phosphor.
- an opening having a shape corresponding to an optical path of light incident on the one end of the optical fiber portion is formed.
- the multi-wavelength photoelectric measurement apparatus is the first aspect of the invention, wherein the multi-wavelength photoelectric measurement apparatus has an opening having a shape corresponding to an optical path of light incident on the one end of the optical fiber portion,
- the phosphor further includes a frame for housing, and the phosphor is fixed in a light-transmitting medium that transmits light from the laser light source and light emitted from the phosphor, and the phosphor and the light-transmitting medium are: It is accommodated in the opening of the frame.
- the multi-wavelength photoelectric measurement apparatus is the first aspect, wherein the multi-wavelength photoelectric measurement apparatus has an opening having a shape corresponding to an optical path of light incident on the one end of the optical fiber portion, and the phosphor is disposed in the opening.
- the multi-wavelength photoelectric measurement apparatus is characterized in that, in any one of the fourth to seventh inventions, a reflection surface is provided on a wall portion on an inner diameter side of the frame body.
- the multi-wavelength photoelectric measurement apparatus is characterized in that, in any one of the first to eighth inventions, the light source optical member is composed of one or a plurality of lenses.
- the multi-wavelength photoelectric measurement apparatus is that, in any one of the first to eighth aspects, the light source optical member is formed of a cylindrical reflecting mirror in which a lens is incorporated.
- a multi-wavelength photoelectric measurement apparatus includes a laser light source, a light source optical member for condensing light from the laser light source, and the light source optical member.
- a phosphor that is excited by the collected light a reflecting member that includes the phosphor on a reflecting surface, and that reflects light emitted from the phosphor on the reflecting surface, and condenses the light emitted from the phosphor.
- a second light source optical member for performing, and an optical fiber portion made of one or a plurality of optical fibers that receive light collected by the second light source optical member from one end and propagate the light to the other end side;
- a head optical member that condenses the light emitted from the other end of the optical fiber portion toward the measurement object, and selectively receives the light from the measurement object according to the wavelength, corresponding to the amount of light received
- a light receiving element that performs photoelectric conversion to a signal, and a wavelength from the light receiving element Characterized in that it comprises a measurement control section for measuring a characteristic quantity of the object to be measured based on the signal indicating the received light amount corresponding.
- a confocal measurement device is a laser light source, a light source optical member for condensing light from the laser light source, and the light source optical member.
- a light comprising one or a plurality of optical fibers that are excited by the light and the phosphor is provided at one end, receives light emitted from the phosphor from one end, and propagates the light to the other end.
- a fiber part and a head optical member for condensing the light emitted from the other end of the optical fiber part toward the measurement object and entering the reflected light from the measurement object to the other end of the optical fiber part
- a branching portion provided in the optical fiber portion for directing at least a part of light incident from the other end of the optical fiber to a second optical path different from the first optical path toward the one end.
- the second optical path from the measurement object A light receiving element that selectively receives light according to a wavelength using a spectroscope and photoelectrically converts the light into a signal corresponding to the amount of light received, and a signal indicating the amount of light received according to the wavelength from the light receiving element
- a measurement control unit that measures the thickness or displacement of the measurement object.
- an interference measuring apparatus is focused by a laser light source, a light source optical member for condensing light from the laser light source, and the light source optical member.
- a head optical member that is incident on the other end of the optical fiber portion, and a first optical path that is provided in the optical fiber portion and that directs at least part of the light incident from the other end of the optical fiber toward the one end.
- a light receiving element that selectively receives light according to a wavelength using a spectroscope, and photoelectrically converts the light that has passed through the second optical path from the measurement object into a signal corresponding to the amount of light received; and the light receiving element And a measurement control unit that measures the thickness or displacement of the measurement object based on a signal indicating the amount of received light according to the wavelength from the light source.
- a color measuring apparatus is focused by a laser light source, a light source optical member for condensing light from the laser light source, and the light source optical member.
- An optical fiber comprising a phosphor excited by light, and one or a plurality of optical fibers that include the phosphor at one end, receive light emitted from the phosphor from one end, and propagate the light to the other end
- a head optical member for condensing the light emitted from the other end of the optical fiber portion toward the measurement object, and selectively receiving the light from the measurement object according to the wavelength.
- a light receiving element that performs photoelectric conversion to a signal corresponding to the signal, and a color of the measurement object based on a signal indicating the amount of light received according to the wavelength from the light receiving element, and a preset reference color range and the measured color
- a measurement control unit for comparing To.
- the light emitted from the laser light source can be incident on the optical fiber portion via the phosphor provided at one end of the optical fiber portion on the light source optical member side. Even in the case where the wavelength is converted and diffused, it can be reliably narrowed down, and light can be efficiently incident on the optical fiber portion. Therefore, it is possible to measure the feature quantity such as the thickness, distance, displacement, color, etc. of the measurement object with high accuracy.
- FIG. 1 is a block diagram schematically showing a multi-wavelength photoelectric measurement apparatus according to an embodiment of the present invention.
- the multi-wavelength photoelectric measurement apparatus 100 includes a laser light source 101, a light source optical member 200, a phosphor 70, an optical fiber unit 300, a head optical member 400, a light receiving element 500, and a measurement control unit 600. *
- the laser light source 101 emits light having a single wavelength, and preferably emits blue or ultraviolet light having a wavelength of 450 nm or less. More preferably, when blue light is emitted, light that is used for excitation of the phosphor 70 and wavelength-converted light and light that is not used for excitation of the phosphor 70 and remains blue light is measured. Can project on things. *
- the phosphor 70 is excited by the light from the laser light source 101 and converted to a different wavelength to emit light.
- the phosphor 70 is composed of one or a plurality of types of phosphors 70.
- the phosphor 70 may be excited by blue light and converted into yellow light to emit light. It may be excited by blue light and converted to green to emit light, and excited by blue light and converted to red to emit light. *
- the phosphor 70 may be fixed in a light-transmitting medium (71 in FIG. 4) such as resin or glass that transmits the light from the laser light source 101 and the light emitted from the phosphor 70.
- a light-transmitting medium 71 in FIG. 4
- resin or glass that transmits the light from the laser light source 101 and the light emitted from the phosphor 70.
- the optical fiber unit 300 includes one or more optical fibers 30.
- the ferrule 20 may be used at the end of the optical fiber 30.
- the core diameter of the exit end which is the end of the optical fiber 30 on the head optical member 400 side, has an influence on the spot diameter imaged on the measurement object, and is preferably 200 ⁇ m or less, more preferably 50 ⁇ m or less.
- the phosphor 70 is fixed to the incident end side which is one end of the optical fiber 30 on the light source optical member 200 side.
- the phosphor 70 is fixed in a light-transmitting medium 71 such as resin or glass that transmits light from the laser light source 101 and light emitted from the phosphor 70, and the light-transmitting medium 71 is incident on the optical fiber 30. You may make it fix to.
- the refractive index of the light transmissive medium 71 is equal to or lower than the refractive index of the core on the incident end side of the optical fiber 30. It is said. *
- a light transmissive medium 71 is included in order to obtain a desired state of light that is used for excitation of the phosphor 70 and wavelength-converted and light that is not used for excitation of the phosphor 70 and is mixed with blue light.
- the thickness of the phosphor 70 in the optical path direction is set to about 10 ⁇ m to 200 ⁇ m, and the concentration of the phosphor 70 in the light transmitting medium 71 is set to about 30% to 60%.
- the thickness of the phosphor 70 or the phosphor 70 including the light transmissive medium 71 in the optical path direction is set to about 10 ⁇ m to 200 ⁇ m
- the shape corresponds to the optical path of the light incident on the incident end of the optical fiber portion 30. It is preferable to provide a frame (80 in FIG. 5) in which an opening is formed, and accommodate the phosphor 70 or the phosphor 70 including the light transmitting medium 71 in the opening of the frame 80.
- the optical fiber unit 300 efficiently excites the phosphor 70 and efficiently mixes light that has been used for exciting the phosphor 70 and wavelength-converted with light that is not used for exciting the phosphor 70 and remains blue. Optically reflecting the light emitted from the phosphor 70 by transmitting the light from the laser light source 101 and / or reflecting the light emitted from the laser light source 101.
- the light source optical member 200 side of the frame 80 may be covered with a filter (reflection filter: 90 in FIG. 7). *
- the light transmissive medium 71 is disposed in a region where the light from the laser light source 101 is concentrated, a material having high heat resistance and / or a material having high heat dissipation is selected as the light transmissive medium 71.
- An adhesive resin may be selected as the light transmissive medium 71, and the phosphor 70 may be bonded and fixed to the incident end of the optical fiber 30 with the adhesive resin.
- the head optical member 400 collects the light emitted from the emission end of the optical fiber unit 300 toward the measurement target (workpiece) W.
- the light receiving element 500 is constituted by an image pickup element such as a multi-division PD (photodiode) or CCD, CMOS, and the like. Light is selectively received according to the wavelength.
- image pickup element such as a multi-division PD (photodiode) or CCD, CMOS, and the like. Light is selectively received according to the wavelength.
- the light receiving element 500 may receive light from the measurement object W via the optical fiber unit 300 or may receive light via another optical path. *
- the measurement control unit 600 measures a feature amount such as a thickness, a distance, a displacement, and a color of the measurement target W based on a signal indicating the amount of light received according to the wavelength from the light receiving element 500.
- the head optical member 400 When the head optical member 400 is configured such that the output end of the optical fiber unit 300 is at the confocal position, the light from the measurement target W is transmitted by the spectroscope 501 including a diffraction grating, a prism, and the like. Are separated according to the wavelength, and the wavelength-luminance distribution of the light from the measuring object W is detected by the light receiving position in the light receiving element 500.
- the measurement control unit 600 detects the light having a longer wavelength when the light to be measured is present at a closer distance when light having a shorter wavelength is detected.
- the measurement control unit 600 detects that the measurement object W is more detected when light having a shorter wavelength is detected.
- the thickness and distance of the measuring object W are measured by evaluating that the measuring object W exists at a closer distance when light having a longer wavelength is detected.
- FIG. 2 is a block diagram schematically showing the configuration of a confocal measurement device that is a multi-wavelength photoelectric measurement device according to Embodiment 1 of the present invention.
- the confocal measurement apparatus 100 configures a coaxial optical system in which light projection and light reception are coaxial in the head optical member.
- the light Lb including a plurality of wavelengths the thickness, distance, and the like of the measurement object (hereinafter, workpiece) W are measured.
- the ferrule 20 holds the end portion of the optical fiber 30 that transmits the light projected from the light projecting unit 10.
- the optical axis of the light to be projected and the central axis of the ferrule 20 (optical fiber 30) are arranged in a straight line.
- the splitter 40 is connected to the ferrule 20, the light receiving unit 50, and the head unit 60 via the optical fiber 30.
- the light incident on the ferrule 20 is transmitted to the head unit 60 as it is, and the reflected light from the head unit 60 is transmitted to the light receiving unit 50.
- the optical fiber 30 is a transmission medium that transmits the light projected from the light projecting unit 10 to the head unit 60.
- the optical fiber 30 includes a core wire that is a light guide and a resin film that covers the core wire.
- the head unit 60 emits light Lb having a plurality of wavelengths to the workpiece W, and a part of the reflected light reflected by the workpiece W surface is incident thereon. Reflected light from the workpiece W is transmitted to the light receiving unit 50 via the optical fiber 30 and the splitter 40. The light receiving unit 50 divides the transmitted reflected light to calculate the thickness, distance, and the like of the workpiece W. *
- FIG. 3 is a schematic diagram showing the configuration of the head unit 60 according to Embodiment 1 of the invention. As shown in FIG. 3, in the head unit 60 according to the first embodiment, a lens 62 is disposed closer to the workpiece W than the collimating lens 61. *
- the light emitted from the end of the optical fiber 30 is converted into parallel light by the collimator lens 61, and the parallel light is condensed on the work W by the lens 62, and chromatic aberration is generated along the optical axis direction. Since the light is condensed by the lens 62, the focal length differs depending on the wavelength of light. Therefore, the measurement accuracy greatly depends on the wavelength of light.
- FIG. 4 is a schematic diagram showing the main configuration of the light projecting unit 10 according to Embodiment 1 of the present invention.
- the light emitted from the laser light source 101 enters the optical fiber 30 through a lens (optical member) 102. Since the focal position can be easily adjusted to the tip portion of the optical fiber 30 in accordance with the distance from the laser light source 101, it is possible to efficiently enter the optical fiber 30.
- the phosphor 70 is thinly applied to the tip portion (tip portion of the optical fiber 30) of the ferrule 20 on the lens (optical member) 102 side.
- it may be fixed in a light-transmitting medium 71 such as resin or glass that transmits light from the laser light source 101 and light emitted from the phosphor 70.
- a light-transmitting medium 71 such as resin or glass that transmits light from the laser light source 101 and light emitted from the phosphor 70.
- the phosphor 70 By providing the phosphor 70 at the tip portion of the optical fiber 30 on the lens 102 side, the fluorescence having one or more wavelengths emitted from the laser light source 101 at the tip portion of the optical fiber 30 on the lens 102 side. Light can enter the optical fiber 30 through the body 70. Therefore, even when light is wavelength-converted and diffused by the phosphor 70, the light can be reliably narrowed down to the optical fiber 30, and light can be efficiently incident into the optical fiber 30.
- FIG. 5 is a schematic diagram showing a configuration provided with a frame body of the light projecting unit 10 according to the first embodiment of the present invention. *
- the light emitted from the laser light source 101 enters the optical fiber 30 through the lens 102.
- the phosphor 70 is thinly applied to the tip portion (tip portion of the optical fiber 30) of the ferrule 20 on the lens (optical member) 102 side.
- FIG. 6 is a partially enlarged schematic diagram showing a configuration in which the frame body of the light projecting unit 10 according to Embodiment 1 of the present invention is provided.
- 6A is a front view of the tip portion of the ferrule 20
- FIGS. 6B and 6C are cross-sectional views taken along line AA in FIG. 6A showing the tip portion of the ferrule 20.
- a phosphor 70 is applied to the tip portion of the ferrule 20, and a frame body 80 is provided so as to surround the periphery.
- the frame 80 has an annular shape, and an opening having a shape corresponding to the optical path of light incident on the incident end of the optical fiber 30 is formed. It is preferable that the opening of the frame body 80 accommodates the phosphor 70 or the phosphor 70 including the light transmissive medium 71.
- the reflective surface 81 in the wall part by the side of the internal diameter of the frame 80. As shown in FIG. This is because the light can be made to enter the optical fiber 30 more efficiently.
- the reflecting surface 81 may be parallel to the optical axis or may be inclined.
- FIG. 6C by making the opening diameter of the frame 80 different between the optical fiber 30 side and the laser light source 101 side (the opening diameter on the laser light source 101 side is preferably smaller), The reflected light can enter the optical fiber 30 once again at the reflecting surface, and the transmission efficiency can be kept high.
- FIG. 7 is a schematic diagram showing a configuration in which a reflection type filter of the light projecting unit 10 according to Embodiment 1 of the present invention is provided.
- FIG. 7A is a schematic diagram illustrating the entire configuration of the light projecting unit 10
- FIG. 7B is a schematic cross-sectional view of the tip portion of the ferrule 20.
- a reflection type filter 90 is provided so as to cover a frame body 80 provided so as to surround the periphery of the phosphor 70.
- the reflection type filter 90 By setting the reflection type filter 90 so as to transmit the light from the laser light source 101 and reflect the light whose wavelength is converted by the phosphor 70, the wavelength-converted light is more efficiently transmitted into the optical fiber 30. It becomes possible to make it enter into.
- FIG. 8 is a front view and a cross-sectional view showing the configuration of the light projecting unit 10 according to Embodiment 1 of the present invention.
- 8A is a front view showing the configuration of the light projecting unit 10
- FIG. 8B is a sectional view taken along the line BB of FIG. 8A showing the configuration of the light projecting unit 10. Yes. *
- the ferrule 20 in which the optical fiber 30 is incorporated is fixed with a ferrule holder 25.
- the ferrule holder 25 is fixed so as to cover one end portion of the lens holder 103 that fixes the lens 102.
- a light source holder 104 to which a laser light source 101 is mounted together with a drive substrate 105 is inserted into the other end portion of the lens holder 103.
- a phosphor 70 is applied to the tip portion of the ferrule 20 (tip portion of the optical fiber 30), and a frame body 80 is provided so as to surround the phosphor 70.
- a reflective filter 90 is provided so as to cover the frame body 80 so that the wavelength-converted light can enter the optical fiber 30 more efficiently.
- the configuration of the tip portion of the ferrule 20 is not limited to this, and the phosphor 70 may be simply applied as shown in FIG. 4, or may be applied as shown in FIG. Alternatively, the frame body 80 may be provided so as to surround the periphery of the phosphor 70. *
- FIG. 9 is a schematic diagram showing a configuration in which a cylindrical reflecting mirror is used in the light projecting unit 10 according to Embodiment 1 of the present invention.
- light of one or a plurality of wavelengths emitted from the laser light source 101 is made to enter the optical fiber 30 by the reflecting mirror 111 via the lens (optical member) 110. Since the light diffused to the outside when using a single lens can be made incident into the optical fiber 30 by the reflecting mirror 111, attenuation of light intensity can be suppressed.
- the phosphor 70 is thinly applied to the tip portion (tip portion of the optical fiber 30) of the ferrule 20 on the lens (optical member) 110 side.
- fluorescence having one or more wavelengths emitted from the laser light source 101 at the distal end portion of the optical fiber 30 on the lens 110 side is provided.
- Light can enter the optical fiber 30 through the body 70. Therefore, even when light is wavelength-converted and diffused by the phosphor 70, the light can be reliably narrowed down to the optical fiber 30, and light can be efficiently incident into the optical fiber 30.
- a frame body 80 surrounding the phosphor may be provided, or a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the wavelength-converted light can be made to enter the optical fiber 30 more efficiently.
- FIG. 10 is a schematic diagram showing a configuration in which both the lens and the cylindrical reflecting mirror are used in the light projecting unit 10 according to the first embodiment of the present invention.
- one lens 102 is arranged between the laser light source 101 and the reflecting mirror 111, and the phosphor 70 is arranged with the laser light source 101 and one lens 102 of the reflecting mirror 111. It is applied to the tip of the side. Thereby, it is possible to enter the optical fiber 30 including light that could not enter the optical fiber 30 due to the limitation of the numerical aperture of the optical fiber 30, and to suppress loss of light intensity. It becomes possible. *
- the frame body 80 surrounding the phosphor 70 may be included, and the reflection surface 81 may be provided on the inner wall portion of the frame body 80. Further, a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the light whose wavelength has been converted by the phosphor 70 can be made to enter the optical fiber 30 more efficiently.
- FIG. 11 is a schematic diagram showing a configuration in which the arrangement of the laser light sources 101 of the light projecting unit 10 according to Embodiment 1 of the present invention is changed. *
- a reflecting mirror 150 that reflects the light emitted from the laser light source 101 and reflects it to the optical fiber 30 side is provided.
- the light having one or more wavelengths emitted from the laser light source 101 is collected by the lens 102 and guided to the reflecting mirror 150.
- the reflecting mirror 150 is coated with a phosphor 70 on the surface, and reflects the light whose wavelength has been converted by the phosphor 70.
- the light reflected by the reflecting mirror 150 is collected by the lens 109 and enters the tip of the optical fiber 30 incorporated in the ferrule 20. Thereby, the freedom degree of arrangement
- the phosphor 70 may generate heat due to the increase in the amount of light. Due to the heat generated by the phosphor 70, the reflection efficiency is lowered, and the light emission may be saturated.
- the reflecting mirror 150 since the heat generation of the phosphor 70 can be suppressed by rotating or moving the reflecting mirror 150, the above-described problem can be solved.
- FIG. 12 is a schematic diagram showing a configuration in which a plurality of optical fibers 30 of the light projecting unit 10 according to Embodiment 1 of the present invention are connected. *
- the optical fiber 30a incorporated in the ferrules 20a and 20b is disposed on the laser light source 101 side, and the optical fiber 30 incorporated in the ferrule 20c is disposed on the opposite side to the laser light source 101 side.
- the phosphor 70 is applied only between the ferrule 20b and the ferrule 20c on the lens 102 side of the ferrule 20c.
- FIG. 13 is an enlarged schematic diagram illustrating a configuration of a portion where a plurality of optical fibers 30 of the light projecting unit 10 according to Embodiment 1 of the present invention are connected.
- the phosphor 70 is applied to the tip portion of the optical fiber 30 of the ferrule 20c on the lens (optical member) 102 side.
- a frame 80 surrounding the periphery of the phosphor 70 is provided, as in the above-described embodiment.
- a reflecting surface 81 may be provided on the inner diameter side wall of the body 80.
- a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the light whose wavelength has been converted by the phosphor 70 can be made to enter the optical fiber 30 more efficiently.
- one lens 102 is used to collect the light emitted from the laser light source 101 onto the optical fiber 30a incorporated in the ferrule 20a.
- the present invention is not limited to this. It is needless to say that the reflecting mirror 111 shown in FIG. 9 may be used, or a plurality of lenses 102 and 110 and the reflecting mirror 111 may be used as shown in FIG. *
- light of one or a plurality of wavelengths emitted from the laser light source 101 is optical fiber via the phosphor 70 provided at the tip portion of the optical fiber 30 on the optical member side. Therefore, even when light is wavelength-converted and diffused by the phosphor 70, it can be surely narrowed down, and light can be efficiently incident into the optical fiber 30. It becomes. Therefore, it is possible to measure the thickness, distance, etc. of the measurement object with high accuracy.
- FIG. 14 is a block diagram schematically showing a configuration of an interference measuring apparatus which is a multi-wavelength photoelectric measuring apparatus according to Embodiment 2 of the present invention.
- the interference measuring apparatus 310 uses a light Lb including a plurality of wavelengths projected from the light projecting unit 10 to measure a measurement target (hereinafter referred to as a workpiece) W. Measure thickness, distance, etc. *
- the ferrule 20 holds the end portion of the optical fiber 30 that transmits the light projected from the light projecting unit 10.
- the optical axis of the light to be projected and the central axis of the ferrule 20 (optical fiber 30) are arranged in a straight line.
- the splitter 40 is connected to the ferrule 20, the light receiving unit 50, and the head unit 60 via the optical fiber 30.
- the light incident on the ferrule 20 is transmitted to the head unit 60 as it is, and the reflected light from the head unit 60 is transmitted to the light receiving unit 50.
- the optical fiber 30 is a transmission medium that transmits the light projected from the light projecting unit 10 to the head unit 60.
- the optical fiber 30 includes a core wire that is a light guide and a resin film that covers the core wire.
- the head unit 60 emits light Lb having a plurality of wavelengths to the workpiece W, and a part of the reflected light reflected by the workpiece W surface is incident thereon. Reflected light from the workpiece W and reflected light generated in the head unit 60 are transmitted to the light receiving unit 50 via the optical fiber 30 and the splitter 40. The light receiving unit 50 calculates the thickness of the workpiece W by dispersing the transmitted reflected light. *
- FIG. 15 is a schematic diagram showing a configuration of the head unit 60 according to Embodiment 2 of the present invention.
- the head unit 60 according to the second embodiment includes an interference optical system that generates interference reflected light L ⁇ b> 3 for measuring the film thickness of the workpiece W. *
- the interference optical system according to the second embodiment is a Milo-type or Mirau-type interference optical system, and includes a condenser lens 131, a glass plate 132, a half mirror 133, and a pin mirror 134.
- a part of the light L0 emitted from the tip portion of the optical fiber 30 is emitted as the detection light L1, and the reflected light reflected by the surface of the workpiece W enters the tip portion of the optical fiber 30.
- the interference reflected light L3 is generated by the reflected light reflected by the reference surface of the light L0 and the reflected light of the detection light L1 on the surface of the work W, and is incident on the tip portion of the optical fiber 30.
- the light L0 collected by the condenser lens 131 is separated into transmitted light and reflected light by the half mirror 133.
- a pin mirror 134 is disposed at the center of the glass plate 132, and reflects the reflected light of the light L0 at the half mirror 133 toward the half mirror 133 side. Thereby, a virtual reference plane 135 is formed.
- the pin mirror 134 reflects the reflected light of the light L0 from the reference surface and the reflected light of the detection light L1 on the surface of the workpiece W. Are formed at the same phase. *
- the detection light L2 obtained by reflecting the light L0 by the half mirror 133 is incident on the pin mirror 134.
- a part of the detection light L ⁇ b> 2 reflected by the pin mirror 134 is reflected by the half mirror 133 toward the condenser lens 131.
- the film thickness of the workpiece W is obtained as the distance d between the virtual reference surface 135 and the workpiece W based on the interference reflected light L3.
- FIG. 16 is a front view and a cross-sectional view showing the configuration of the light projecting unit 10 according to the second embodiment of the present invention.
- 16A is a front view showing the configuration of the light projecting unit 10
- FIG. 16B is a sectional view taken along the line BB of FIG. Yes. *
- the ferrule 20 in which the optical fiber 30 is incorporated is fixed with a ferrule holder 25.
- the ferrule holder 25 is fixed so as to cover one end portion of the lens holder 103 that fixes the lens 102.
- a light source holder 104 to which a laser light source 101 is mounted together with a drive substrate 105 is inserted into the other end portion of the lens holder 103.
- a phosphor 70 is applied to the tip portion of the ferrule 20 (tip portion of the optical fiber 30), and a frame body 80 is provided so as to surround the phosphor 70.
- a reflective filter 90 is provided so as to cover the frame body 80 so that the wavelength-converted light can enter the optical fiber 30 more efficiently.
- the configuration of the tip portion of the ferrule 20 is not limited to this, and the phosphor 70 may be applied just like the first embodiment, or the periphery of the applied phosphor 70
- the frame 80 may be provided so as to surround the frame.
- FIG. 17 is a schematic diagram showing a configuration in which a cylindrical reflecting mirror is used in the light projecting unit 10 according to Embodiment 2 of the present invention.
- light having a plurality of wavelengths emitted from the laser light source 101 is made to enter the optical fiber 30 by the reflecting mirror 111 through the lens (optical member) 110. Since the light diffused to the outside when using a single lens can be made incident into the optical fiber 30 by the reflecting mirror 111, attenuation of light intensity can be suppressed.
- the phosphor 70 is thinly applied to the tip portion (tip portion of the optical fiber 30) of the ferrule 20 on the lens (optical member) 110 side.
- fluorescence having one or more wavelengths emitted from the laser light source 101 at the distal end portion of the optical fiber 30 on the lens 110 side is provided.
- Light can enter the optical fiber 30 through the body 70. Therefore, even when light is wavelength-converted and diffused by the phosphor 70, the light can be reliably narrowed down to the optical fiber 30, and light can be efficiently incident into the optical fiber 30.
- a frame body 80 surrounding the phosphor may be provided, or a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the wavelength-converted light can be made to enter the optical fiber 30 more efficiently.
- FIG. 18 is a schematic diagram showing a configuration in which both the lens and the cylindrical reflecting mirror are used in the light projecting unit 10 according to the second embodiment of the present invention.
- one lens 102 is arranged between the laser light source 101 and the reflecting mirror 111, and the phosphor 70 is arranged with the laser light source 101 and one lens 102 of the reflecting mirror 111. It is applied to the tip of the side. Thereby, it is possible to enter the optical fiber 30 including light that could not enter the optical fiber 30 due to the limitation of the numerical aperture of the optical fiber 30, and to suppress loss of light intensity. It becomes possible. *
- a frame body 80 that surrounds the periphery of the phosphor 70 may be provided, and a reflection surface 81 may be provided on a wall portion on the inner diameter side of the frame body 80. Further, a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the light whose wavelength has been converted by the phosphor 70 can be made to enter the optical fiber 30 more efficiently.
- FIG. 19 is a schematic diagram showing a configuration in which the arrangement of the laser light sources 101 of the light projecting unit 10 according to Embodiment 2 of the present invention is changed. *
- a reflecting mirror 150 that reflects the light emitted from the laser light source 101 and reflects the light toward the optical fiber 30 side is provided.
- the light having one or more wavelengths emitted from the laser light source 101 is collected by the lens 102 and guided to the reflecting mirror 150.
- the reflecting mirror 150 is coated with a phosphor 70 on the surface, and reflects the light whose wavelength has been converted by the phosphor 70.
- the light reflected by the reflecting mirror 150 is collected by the lens 109 and enters the tip of the optical fiber 30 incorporated in the ferrule 20. Thereby, the freedom degree of arrangement
- the phosphor 70 may generate heat due to the increase in the amount of light. Due to the heat generated by the phosphor 70, the reflection efficiency is lowered, and the light emission may be saturated.
- the reflecting mirror 150 since the heat generation of the phosphor 70 can be suppressed by rotating or moving the reflecting mirror 150, the above-described problem can be solved.
- FIG. 20 is a schematic diagram showing a configuration in which a plurality of optical fibers 30 of the light projecting unit 10 according to Embodiment 2 of the present invention are connected. *
- the optical fiber 30a incorporated in the ferrules 20a and 20b is arranged on the laser light source 101 side, and the optical fiber 30 incorporated in the ferrule 20c is arranged on the opposite side to the laser light source 101 side.
- the phosphor 70 is applied only between the ferrule 20b and the ferrule 20c on the lens 102 side of the ferrule 20c.
- FIG. 21 is an enlarged schematic diagram showing a configuration of a portion where a plurality of optical fibers 30 of the light projecting unit 10 according to Embodiment 2 of the present invention are connected.
- the phosphor 70 is applied to the tip portion of the optical fiber 30 of the ferrule 20c on the lens (optical member) 102 side.
- a frame 80 surrounding the periphery of the phosphor 70 is provided, as in the above-described embodiment.
- a reflecting surface 81 may be provided on the inner diameter side wall of the body 80.
- a reflective filter 90 may be provided so as to cover the frame body 80. In either case, the light whose wavelength has been converted by the phosphor 70 can be made to enter the optical fiber 30 more efficiently.
- the single lens 102 is used to focus the light emitted from the laser light source 101 onto the optical fiber 30a incorporated in the ferrule 20a.
- the present invention is not limited to this. It is needless to say that the reflecting mirror 111 shown in FIG. 17 may be used, or a plurality of lenses 102 and 110 and the reflecting mirror 111 may be used as shown in FIG. *
- the phosphors 70 may be dispersedly arranged in the optical fiber 30a.
- the reflective filter 90 is provided so as to cover the incident end of the optical fiber 30a instead of being provided between the optical fiber 30 and the optical fiber 30a.
- one or more wavelengths of light emitted from the laser light source 101 are passed through the optical fiber 30 via the phosphor 70 provided at the tip portion on the optical member side. Therefore, even when light is wavelength-converted and diffused by the phosphor 70, it can be surely narrowed down, and light can be efficiently incident into the optical fiber 30. It becomes. Therefore, it is possible to measure the thickness, distance, etc. of the measurement object with high accuracy.
- the present invention is not limited to the above-described embodiments, and various changes and improvements can be made within the scope of the present invention.
- the optical members disclosed in the first and second embodiments described above are not limited to these, and a concave lens, a reflector (reflector), or the like may be combined in addition to the convex lens.
- the types, ratios, coatings, and the like of fluorescent materials used as phosphors can be implemented using appropriate combinations and ratios according to optical characteristics.
- the multi-wavelength photoelectric measurement apparatus of the present invention is a confocal displacement meter and an interference displacement meter capable of measuring feature quantities such as thickness, distance, displacement, and color of a measurement object using light of multiple wavelengths such as white. And a multi-wavelength photoelectric measuring device such as a color optical sensor.
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Abstract
Description
光させることができるからである。もちろん、反射面81は、光軸に平行であっても良いし、傾斜していても良い。例えば図6(c)に示すように、枠体80の開口径を光ファイバ30側とレーザ光源101側とで異ならせる(レーザ光源101側の開口径の方が小さいことが好ましい)ことにより、反射面で反射光を今一度光ファイバ30へと入光させることができ、伝送効率を高く維持することができる。
な基準面135とワークWとの間の距離dとして求められる。
Claims (14)
- レーザ光源と、 前記レーザ光源からの光を集光するための光源光学部材と、 前記光源光学部材により集光された光により励起される蛍光体と、 一端に前記蛍光体を備え、該一端側から前記蛍光体が発光する光を受け付け、他端側に受け付けた光を伝搬する、一又は複数の光ファイバからなる光ファイバ部と、 該光ファイバ部の前記他端から出射される光を測定対象物に向けて集光するヘッド光学部材と、 測定対象物からの光を波長に応じて選択的に受光し、受光量に対応した信号に光電変換する受光素子と、 該受光素子からの波長に応じた受光量を示す信号に基づいて測定対象物の特徴量を測定する測定制御部と を備えることを特徴とする多波長光電測定装置。
- 前記蛍光体は、前記レーザ光源からの光及び前記蛍光体が発光する光を透過する光透過性媒体内に固定され、かつ、該光透過性媒体が前記光ファイバ部の前記一端に固定されることを特徴とする請求項1に記載の多波長光電測定装置。
- 前記蛍光体と前記光源光学部材との間に、前記レーザ光源からの光を透過し、かつ、前記蛍光体が発光する光を反射する光学フィルタをさらに備えることを特徴とする請求項1又は2に記載の多波長光電測定装置。
- 前記光ファイバ部の前記一端に入射される光の光路に対応した形状の開口が形成された、該開口に前記蛍光体を収容する枠体をさらに備えることを特徴とする請求項1乃至3のいずれか一に記載の多波長光電測定装置。
- 前記光ファイバ部の前記一端に入射される光の光路に対応した形状の開口が形成されており、該開口に前記蛍光体を収容する枠体と、 該枠体の前記光源光学部材側を覆い、前記レーザ光源からの光を透過し、かつ、前記蛍光体が発光する光を反射する光学フィルタと をさらに備えることを特徴とする請求項1に記載の多波長光電測定装置。
- 前記光ファイバ部の前記一端に入射される光の光路に対応した形状の開口を有し、該開口に前記蛍光体を収容する枠体をさらに備え、 前記蛍光体は、前記レーザ光源からの光及び前記蛍光体が発光する光を透過する光透過性媒体内に固定され、 前記蛍光体及び前記光透過性媒体が、前記枠体の開口に収容されることを特徴とする請求項1に記載の多波長光電測定装置。
- 前記光ファイバ部の前記一端に入射される光の光路に対応した形状の開口を有し、該開口に前記蛍光体を収容する枠体と、 前記枠体の前記光源光学部材側を覆い、前記レーザ光源からの光を透過し、かつ、前記蛍光体が発光する光を反射する光学フィルタと をさらに備え、 前記蛍光体は、前記レーザ光源からの光及び前記蛍光体が発光する光を透過する光透過性媒体内に固定され、 前記蛍光体及び前記光透過性媒体が、前記枠体の開口に収容されることを特徴とする
請求項1に記載の多波長光電測定装置。 - 前記枠体の内径側の壁部に反射面を備えることを特徴とする請求項4乃至7のいずれか一項に記載の多波長光電測定装置。
- 前記光源光学部材は、一又は複数のレンズで構成されていることを特徴とする請求項1乃至8のいずれか一項に記載の多波長光電測定装置。
- 前記光源光学部材は、レンズが組み込まれた筒状の反射鏡で構成されていることを特徴とする請求項1乃至8のいずれか一項に記載の多波長光電測定装置。
- (反射鏡タイプ) レーザ光源と、 前記レーザ光源からの光を集光するための光源光学部材と、 前記光源光学部材により集光された光により励起される蛍光体と、 反射面に前記蛍光体を備え、該反射面において前記蛍光体が発光する光を反射する反射部材と、 前記蛍光体が発光する光を集光するための第2光源光学部材と、 該第2光源光学部材で集光された光が一端から入射され、他端側に該光を伝搬する一又は複数の光ファイバからなる光ファイバ部と、 該光ファイバ部の前記他端から出射される光を測定対象物に向けて集光するヘッド光学部材と、 測定対象物からの光を波長に応じて選択的に受光し、受光量に対応した信号に光電変換する受光素子と、 該受光素子からの波長に応じた受光量を示す信号に基づいて測定対象物の特徴量を測定する測定制御部と を備えることを特徴とする多波長光電測定装置。
- (共焦点タイプ) レーザ光源と、 前記レーザ光源からの光を集光するための光源光学部材と、 前記光源光学部材により集光された光により励起される蛍光体と、 一端に前記蛍光体を備え、該一端側から前記蛍光体が発光する光を受け付け、他端側に該光を伝搬する一又は複数の光ファイバからなる光ファイバ部と、 該光ファイバ部の前記他端から出射される光を測定対象物に向けて集光し、測定対象物からの反射光を前記光ファイバ部の前記他端に入射するヘッド光学部材と、 前記光ファイバ部に設けられ、前記光ファイバの前記他端から入射された光の少なくとも一部を、前記一端へ向かう第1の光路とは異なる第2の光路へ向けるための分岐部と、 測定対象物からの前記第2の光路を経た光を、分光器を用いて波長に応じて選択的に受光し、受光量に対応した信号に光電変換する受光素子と、 前記受光素子からの波長に応じた受光量を示す信号に基づいて測定対象物の厚み又は変位を測定する測定制御部と を備えることを特徴とする共焦点測定装置。
- (干渉タイプ) レーザ光源と、 前記レーザ光源からの光を集光するための光源光学部材と、 前記光源光学部材により集光された光により励起される蛍光体と、 一端に前記蛍光体を備え、該一端側から前記蛍光体が発光する光を受け付け、他端側に該光を伝搬する、一又は複数の光ファイバからなる光ファイバ部と、 参照体を有し、前記光ファイバ部の前記他端から出射される光を測定対象物及び該参照体に向けて集光し、測定対象物及び前記参照体からの反射光を前記光ファイバ部の前記他端に入射するヘッド光学部材と、 前記光ファイバ部に設けられ、前記光ファイバの前記他端から入射された光の少なくとも一部を、前記一端へ向かう第1の光路とは異なる第2の光路へ向けるための分岐部と、 測定対象物からの前記第2の光路を経た光を、分光器を用いて波長に応じて選択的に受光し、受光量に対応した信号に光電変換する受光素子と、 該受光素子からの波長に応じた受光量を示す信号に基づいて測定対象物の厚み又は変位を測定する測定制御部と を備えることを特徴とする干渉測定装置。
- (カラーセンサ) レーザ光源と、 前記レーザ光源からの光を集光するための光源光学部材と、 前記光源光学部材により集光された光により励起される蛍光体と、 一端に前記蛍光体を備え、該一端側から前記蛍光体が発光する光を受け付け、他端側に該光を伝搬する一又は複数の光ファイバからなる光ファイバ部と、 該光ファイバ部の前記他端から出射される光を測定対象物に向けて集光するヘッド光学部材と、 測定対象物からの光を波長に応じて選択的に受光し、受光量に対応した信号に光電変換する受光素子と、 該受光素子からの波長に応じた受光量を示す信号に基づいて測定対象物の色を測定し、予め設定された基準色範囲と該測定した色とを比較する測定制御部と を備えることを特徴とするカラー測定装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112015003040.9T DE112015003040T5 (de) | 2014-06-27 | 2015-06-23 | Fotoelektrisches Multi-Wellenlängen-Messgerät, konfokales Messgerät, Interferenz-Messgerät und Farbmessgerät |
JP2016529587A JP7010589B2 (ja) | 2014-06-27 | 2015-06-23 | 多波長共焦点測定装置 |
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US15/375,190 US10180355B2 (en) | 2014-06-27 | 2016-12-12 | Confocal measurement device |
US16/203,648 US11060917B2 (en) | 2014-06-27 | 2018-11-29 | Confocal displacement measurement device and a confocal thickness measurement device |
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Also Published As
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CN106471332A (zh) | 2017-03-01 |
DE112015003040T5 (de) | 2017-03-23 |
JP2020079807A (ja) | 2020-05-28 |
JPWO2015199054A1 (ja) | 2017-04-20 |
US10180355B2 (en) | 2019-01-15 |
JP7270807B2 (ja) | 2023-05-10 |
US20190094074A1 (en) | 2019-03-28 |
CN106471332B (zh) | 2019-07-09 |
US20170122808A1 (en) | 2017-05-04 |
JP7010589B2 (ja) | 2022-01-26 |
JP2022095987A (ja) | 2022-06-28 |
CN110196020B (zh) | 2021-08-10 |
JP7284114B2 (ja) | 2023-05-30 |
US11060917B2 (en) | 2021-07-13 |
CN110196020A (zh) | 2019-09-03 |
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