WO2016080121A1 - Dispositif de source de lumière et système d'observation photographique - Google Patents

Dispositif de source de lumière et système d'observation photographique Download PDF

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Publication number
WO2016080121A1
WO2016080121A1 PCT/JP2015/079262 JP2015079262W WO2016080121A1 WO 2016080121 A1 WO2016080121 A1 WO 2016080121A1 JP 2015079262 W JP2015079262 W JP 2015079262W WO 2016080121 A1 WO2016080121 A1 WO 2016080121A1
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Prior art keywords
light
light source
white
white light
color temperature
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PCT/JP2015/079262
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English (en)
Japanese (ja)
Inventor
三幸 畠中
彩花 森田
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岩崎電気株式会社
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Publication of WO2016080121A1 publication Critical patent/WO2016080121A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/07—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements using light-conductive means, e.g. optical fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/043—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances for fluorescence imaging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/046—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances for infrared imaging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0638—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements providing two or more wavelengths
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0655—Control therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0669—Endoscope light sources at proximal end of an endoscope
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0661—Endoscope light sources
    • A61B1/0684—Endoscope light sources using light emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides

Definitions

  • the present invention relates to a light source device and a photographing observation system including the light source device.
  • endoscope observation using an endoscope is widely performed for observation inside a body cavity.
  • An endoscope system used for this endoscope observation has also been put into practical use.
  • a shooting camera is provided at the tip of a light guide that guides the illumination light output from the light source device, and the observation point is illuminated with the illumination light.
  • narrowband light observation, fluorescence observation, and infrared light observation are known as endoscopic observations, and the illumination light applied to each observation location is different.
  • the wavelength is 390 nm to 445 nm, or the wavelength is 530 nm.
  • Illumination light having a narrow band of ⁇ 550 nm is irradiated on the observation location, and the difference in the degree of absorption of hemoglobin at this observation location is highlighted and displayed on the display device.
  • fluorescence observation illumination light having a wavelength of 390 nm to 470 nm and a wavelength of 540 nm to 560 nm is irradiated to the observation site.
  • illumination light with a wavelength of 390 nm to 470 nm becomes excitation light, and a fluorescent substance such as collagen is self-fluorescent, and illumination light with a wavelength of 540 nm to 560 nm is absorbed by hemoglobin in blood.
  • the difference in the degree of autofluorescence and hemoglobin absorption is displayed with emphasis on the display device.
  • illumination light with a wavelength of 730 to 790 nm is irradiated to the observation site.
  • the illumination light becomes excitation light for exciting the IGC reagent administered into the blood, and the fluorescence of the IGC reagent is displayed on the display device.
  • an object of the present invention is to provide a light source device and a photographing observation system that can suppress a change in white balance of a photographed image even when the amount of illumination light changes.
  • the present invention radiates a white light source that emits white light and first light in a first wavelength band that partially overlaps the wavelength band of the white light within the wavelength band of visible light.
  • a first light source that synthesizes the white light and the first light on the same optical axis to emit illumination light for photographing, and the first light source can be switched on and off.
  • An auxiliary light source that radiates light having different wavelengths within the visible light wavelength band, and the white light of the white light source when the first light source is turned on and off.
  • a light source controller that changes an output light amount ratio of each light of the auxiliary light source to an output efficiency ratio that maintains the color temperature of the illumination light before the switching.
  • the present invention further includes an operation unit that receives a dimming operation of the white light, and the light source control unit adjusts the white light according to the dimming operation.
  • the output light amount ratio of each color of the white light and the auxiliary light source is changed to an output light amount ratio in which the color temperature in the enclosed space illuminated by the illumination light is maintained constant.
  • the present invention further includes an operation unit that accepts a color temperature adjustment operation of the white light, and the light source control unit determines the white light of the white light source and the output light amount ratio of each color of the auxiliary light source. The output light quantity ratio is changed to obtain the color temperature specified by the color temperature adjustment operation.
  • the present invention is characterized in that the light source device further comprises a combining means for combining the light of the auxiliary light source and the white light of the white light source on the same optical axis.
  • the present invention is characterized in that, in the light source device, the auxiliary light source emits light having a wavelength of each of the three primary colors.
  • the white light source and the auxiliary light source may be semiconductor light sources whose output light amount is variable according to a drive current value, and the light source control unit is a drive that can obtain the output light amount ratio. It is characterized in that data defining a current value is provided in advance.
  • a light source device for photographing a portion illuminated by illumination light emitted from the light source device, and a display device for displaying a photographed image photographed by the photographing camera on a screen.
  • a photographing observation system characterized by comprising:
  • FIG. 1 is a diagram schematically showing a configuration of an endoscope system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram for explaining an observation image.
  • FIG. 3 is a diagram schematically illustrating the configuration of the light source device.
  • FIG. 4 is an explanatory diagram of an LED chip as an example of a white light source unit.
  • FIG. 5 is a diagram illustrating a spectral distribution of illumination light emitted from the light source device.
  • FIG. 6 is a chromaticity diagram showing a change in color temperature in a closed space simulating the inside of a body cavity.
  • FIG. 7 is a diagram illustrating a functional configuration of the light control unit.
  • FIG. 8 is a diagram schematically showing a color temperature maintenance reference table.
  • FIG. 9 is a diagram schematically showing a color temperature variable reference table.
  • FIG. 10 is a flowchart showing the operation of the light source device.
  • FIG. 1 is a diagram schematically illustrating a configuration of an endoscope system 1 according to the present embodiment.
  • the endoscope system 1 is a system used for displaying and observing an image inside the body cavity 9, and as shown in FIG. 1, a light source device 2, a light guide 3, and an endoscope device 4 are used.
  • the light source device 2 is a device that emits illumination light K for photographing the observation location C inside the body cavity 9, and includes an emission port 2 ⁇ / b> A that emits the illumination light K.
  • An end surface 3A on one end side of the light guide 3 is connected to the emission port 2A, and the illumination light K is incident on the light guide 3 from the end surface 3A.
  • the light guide 3 is a light guide member that guides the illumination light K incident on the end surface 3A on one end side to the end surface 3B on the other end side while propagating through the interior by total reflection.
  • a bundle fiber formed by bundling strands of a plurality of optical fibers is used.
  • the endoscope device 4 is connected to the end surface 3B of the light guide 3, and the illumination light K of the light source device 2 is introduced into the endoscope device 4 through the light guide 3.
  • the endoscope device 4 is introduced into the body cavity 9 and images while illuminating light K is applied to the observation location C inside the body cavity 9.
  • the endoscope device 4 includes an irradiation unit 4A that irradiates the observation spot C with the illumination light K introduced from the light guide 3, and a photographing camera 4B that images the observation spot C.
  • the photographing camera 4B includes an image sensor such as a CCD, and outputs a photographing signal D1 obtained by photographing the observation location C to the control unit 5 through the signal cable 7.
  • the control unit 5 includes an image signal processing unit 8 that processes the photographing signal D1 and generates a display signal D2.
  • the display signal D ⁇ b> 2 is a signal for displaying an observation image of the observation location C on the screen of the display device 6, and is output to the display device 6 by the control unit 5.
  • the signal processing performed by the image signal processing unit 8 includes white balance adjustment processing as in the conventional endoscope system. That is, the image signal processing unit 8 performs gain adjustment (color tone adjustment) of the photographic signal D1 using a predetermined white balance parameter. As a result, the observation image is displayed on the display device 6 with a predetermined white balance.
  • the display device 6 is, for example, a liquid crystal display device that displays various images, and displays the observation image G of the observation location C on the screen based on the display signal D2.
  • FIG. 2 is a schematic diagram for explaining the observation image G.
  • a white light observation image G1 a fluorescence observation image G2, and a white fluorescence simultaneous observation image G3 are displayed on the display device 6 as the observation image G.
  • the white light observation image G1 is an image obtained by photographing with the photographing camera 4B while irradiating the observation spot C of the affected part with the white light K1 as the illumination light K.
  • the fluorescence observation image G2 is an image obtained by photographing with the photographing camera 4B while irradiating the excitation light K2 that excites a fluorescent substance such as indocyanine green (ICG) previously administered to the observation site C of the affected part as the illumination light K. It is.
  • This fluorescent substance has the property of remaining in the lesioned part of the affected part, and the lesioned part included in the observation point C of the affected part is reflected in the relief by photographing the fluorescence of the fluorescent substance.
  • the fluorescence observation image G2 is merely an example, and the object projected on the relief differs depending on the fluorescent material. For example, when the fluorescent substance is a substance that acts on the blood component, the fluorescence reflects the blood vessels instead of the affected area.
  • the brightness of the background of the fluorescence observation image G2 is not zero.
  • the photographing camera 4B has the wavelength band of the excitation light K2 and the wavelength band of the reflected light reflected by the excitation light K2 at the observation location C. The brightness is determined according to the spectral sensitivity characteristics.
  • the white fluorescent simultaneous observation image G3 is an image obtained by photographing with the photographing camera 4B while irradiating the observation portion C of the affected part with the illumination light K, which is a combination of the white light K1 and the excitation light K2 with the same optical axis. is there.
  • the white fluorescence simultaneous observation image G3 an image in a mode in which the white light observation image G1 projected by the irradiation with the white light K1 and the fluorescence observation image G2 projected by the excitation light K2 are superimposed is obtained.
  • This white fluorescence simultaneous observation image G3 enables simultaneous observation while comparing the affected area and the affected area.
  • the observation image G is white even if the position of the photographing camera 4B is changed inside the body cavity 9. No change in balance or uneven color.
  • the light source device 2 in order to be able to capture these observation images G, can select and emit either or both of the white light K1 and the excitation light K2 as illumination light K. It is configured.
  • FIG. 3 is a diagram schematically showing the configuration of the light source device 2.
  • the light source device 2 includes a light source unit 10, an operation unit 12, and a light source control unit 14.
  • the light source unit 10 emits illumination light K, and includes a white light observation light source 20, a fluorescence observation light source 21, and a synthesis optical system 22.
  • the white light observation light source 20 includes a white light source unit 24 that emits the white light K1.
  • the white light source unit 24 can be dimmed and has a variable color temperature.
  • the white light source unit 24 includes a white light source unit 24A, an auxiliary light source unit 24B, and a combining optical element 24C.
  • the white light source unit 24A emits white light K1A.
  • the auxiliary light source unit 24B emits auxiliary light K1B in the visible light wavelength region in order to adjust the color temperature of the white light K1.
  • the combining optical element 24C combines the white light K1A and the auxiliary light K1B on the same optical axis and emits the white light K1.
  • the white light source unit 24A and the auxiliary light source unit 24B are dimmable light sources.
  • a semiconductor light source is used as the light source
  • a white LED 24A1 is used in the white light source unit 24A.
  • the white LED 24A1 has a blue LED sealed with a phosphor resin in which a yellow phosphor is dispersed, and emits white light K1A by mixing the emission color of the blue LED and the fluorescent color of the yellow phosphor.
  • the auxiliary light source unit 24B is a light source that emits light of each of the three primary colors as light in the visible light wavelength range.
  • the auxiliary light source unit 24B includes a red LED 24B1 that emits red, a green LED 24B2 that emits green, and a blue LED 24B3 that emits blue, and emits light of these colors as auxiliary light K1B.
  • Output light amounts (radiation intensities) of the white LED 24A1 of the white light source unit 24A and the red LED 24B1, the green LED 24B2, and the blue LED 24B3 of the auxiliary light source unit 24B are configured to be individually adjustable. This adjustment can be realized, for example, by variably controlling the drive current applied to each LED. Since the output light quantity of each of the three primary colors emitted from the auxiliary light source unit 24B can be individually adjusted, the auxiliary light source is supported over a wide range in the xy chromaticity diagram by changing the ratio of the output light quantity of each color (radiation intensity mixing ratio). The chromaticity of the light K1B can be varied.
  • the white light K1 of the white light source unit 24 is obtained by combining the auxiliary light K1B of the auxiliary light source unit 24B with the white light K1A of the white LED 24A1 on the same optical axis. Therefore, the white light K1 of the white light source unit 24 covers a wider range than the auxiliary light K1B in the xy chromaticity diagram by changing the ratio of the output light amount (radiation intensity mixing ratio) of each light including the white LED 24A1.
  • the chromaticity can be varied.
  • the combining optical element 24C is an optical element that combines and emits the light of the white light K1A, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 on the same optical axis.
  • the white light source unit 24 is realized by an LED chip 26 that includes a white LED 24A1, a red LED 24B1, a green LED 24B2, and a blue LED 24B3 on the light emitting surface 26A.
  • the red LED 24B1, the green LED 24B2, and the blue LED 24B3 are arranged close to each other around the center O of the light emitting surface 26A.
  • the light emitting surface 26A is covered with a bullet-type lens 27 which is a synthetic optical element 24C. Accordingly, the light emitted from the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 on the light emitting surface 26A is synthesized and emitted by the lens 27 on the same optical axis.
  • the white light source unit 24 is not limited to the configuration using the LED chip 26.
  • the composition optical element 24C such as a dichroic mirror may be combined on the same optical axis through the emitted light of each of the white LED 24A1, red LED 24B1, green LED 24B2, and blue LED 24B3 and output.
  • the white light K1A of the white light source unit 24A and the auxiliary light K1B of the auxiliary light source unit 24B are combined on the same optical axis and emitted as white light K1.
  • the observation image G can be obtained even if the position of the photographing camera 4B is changed inside the body cavity 9. There is no change in white balance or uneven color.
  • the fluorescence observation light source 21 emits the excitation light K2.
  • the fluorescence observation light source 21 includes an infrared light source unit 25 that emits infrared light, and emits the infrared light of the infrared light source unit 25 as excitation light K2.
  • the infrared light source unit 25 is an infrared LED that emits infrared light.
  • the synthesizing optical system 22 is an optical system that synthesizes the white light K1 of the white light observation light source 20 and the excitation light K2 of the fluorescence observation light source 21 on the same optical axis, and emits the illumination light K from the emission port 2A. Yes, with one or more optical elements.
  • the synthesis optical system 22 includes a dichroic mirror 22A as an optical element.
  • the dichroic mirror 22A transmits the white light K1, reflects the excitation light K2 coaxially with the white light K1, combines them, and emits them as illumination light K.
  • the operation unit 12 receives an operation of a user who performs endoscopic observation, and the operation is input to the light source control unit 14.
  • the operation unit 12 may be an appropriate member such as an operator or a touch panel.
  • Operations that the light source device 2 receives from the operation unit 12 include switching on / off switching of the fluorescence observation light source 21, dimming operation of the white light K ⁇ b> 1 of the white light observation light source 20 (so-called light amount adjustment operation), and white There is a color temperature adjustment operation of the light K1.
  • the dimming amount can be specified between 1% and 100%, and the color temperature adjustment operation can be performed between 1500 (K) and 15000 (K) on the black body radiation locus.
  • the temperature can be specified.
  • the user can turn off the fluorescence observation light source 21 and observe only the white light observation image G1.
  • the user can observe the white light simultaneous observation image G3 obtained by superimposing the white light observation image G1 and the fluorescence observation image G2 by turning on the fluorescence observation light source 21.
  • the user can observe only the fluorescence observation image G2 by adjusting the white light observation light source 20 to 1% (that is, almost extinguished), and adjust the white light observation light source 20 appropriately. By illuminating, the contrast between the affected area and the affected area in the white fluorescent simultaneous observation image G3 can be adjusted.
  • the light source control unit 14 controls the turning on / off (that is, blinking) of the fluorescence observation light source 21 based on the operation of the operation unit 12, and the dimming control of the white light observation light source 20.
  • a unit control unit 30 and an infrared light source unit control unit 31 are provided.
  • the white light source unit control unit 30 includes a dimming unit 32 that performs dimming control on the white light source unit 24A and the auxiliary light source unit 24B of the white light source unit 24, and the infrared light source unit control unit 31 includes the infrared light source unit 25. Is provided with a blinking unit 33 that controls blinking.
  • a circuit for dimming the infrared light source unit 25 can be provided in the infrared light source unit control unit 31.
  • the white light source unit controller 30 has the following functions. That is, this is a function of changing the ratio of the output light amount of each light of the white light source unit 24A and the auxiliary light source unit 24B of the white light source unit 24.
  • the ratio of the output light amount of each light maintains the color temperature of the illumination light K constant based on the dimming amount of the white light K1 of the white light observation light source 20 and the switching on / off of the fluorescence observation light source 21. Change the ratio to
  • the white balance may change.
  • FIG. 5 is a diagram showing a spectral distribution of the illumination light K emitted from the light source device 2.
  • a wavelength band ⁇ E1 is a wavelength band of the white light K1A of the white LED 24A1, which is the main light source of the white light K1.
  • the wavelength band ⁇ E2 is the wavelength band of the excitation light K2 of the infrared light source unit 25.
  • the wavelength band ⁇ E1 and a part of the wavelength band ⁇ 3 of the wavelength band ⁇ E2 overlap in the visible light wavelength band.
  • the visible light wavelength band is, for example, in the wavelength range of about 380 nm to about 780 nm.
  • a part of the wavelength band ⁇ E3 is a wavelength band in a predetermined range of, for example, 700 nm or less.
  • the overlapping of the wavelength band ⁇ 3 supplements the radiation intensity of the wavelength band ⁇ E1 of the white light K1A.
  • the color temperature of the white light K1A of the white LED 24A1 including the wavelength band ⁇ E3 is observed to change.
  • the white balance of the captured image of the observation location C changes. More specifically, when the white LED 24A1 is dimmed in a closed space such as the inside of the body cavity 9, the infrared light source unit 25 is turned on or off, and the auxiliary light source unit 24B is turned off. The color temperature in the enclosed space changes. As a result, the white balance of the captured image at the observation location C changes.
  • FIG. 6 is a chromaticity diagram showing a change in color temperature in a closed space simulating the inside of the body cavity 9.
  • This chromaticity diagram shows that the white LED 24A1 is 15% to 15% in a state where the endoscope device 4 of the endoscope system 1 is arranged in a closed space, the infrared light source unit 25 is turned on, and the auxiliary light source unit 24B is turned off.
  • the change of the color temperature F in the enclosed space when dimming between 100% is shown.
  • the white LED 24A1 is dimmed between 15% and 100%, the color temperature F in the closed space greatly fluctuates.
  • the white balance of the captured image will also change.
  • the color of the observation point C is very important for observing the state of the affected area, and the observation image is changed each time the blinking operation of the excitation light K2 or the dimming operation of the white light K1A is performed. It is not preferable that the white balance changes. Further, if the image signal processing unit 8 of the control unit 5 performs the process of canceling the white balance change, the process of the image signal processing unit 8 becomes very complicated.
  • the white light source unit 24 in addition to the white light source unit 24A, the auxiliary light source unit 24B that outputs light of each of the three primary colors as light in the visible light wavelength range in a variable amount of output light. Is provided.
  • the dimming unit 32 of the white light source unit control unit 30 maintains the color temperature of the illumination light K constant before and after the excitation light K2 is switched on / off. The ratio of the output light amount of each light of the white light source unit 24A and the auxiliary light source unit 24B is changed.
  • the white light source unit when the dimming operation of the white light K1 is performed, the white light source unit so that the dimming unit 32 of the white light source unit control unit 30 maintains the color temperature in the closed space constant before and after the dimming.
  • the ratio of the output light amount of each light of 24A and auxiliary light source unit 24B is changed.
  • the light source device 2 also has a function of adjusting the color temperature of the white light K1 in a range between 1500 (K) and 15000 (K) along the black body radiation locus. This adjustment is realized by the dimmer 32 controlling the ratio of the output light quantity of each of the three primary colors of the white light K1A of the white light source 24A and the light of the auxiliary light source 24B.
  • FIG. 7 is a block diagram illustrating a functional configuration of the light control unit 32.
  • the dimming unit 32 includes an output light amount ratio determining unit 40 that determines a ratio of output light amounts of the white light source unit 24A and the auxiliary light source unit 24B of the white light source unit 24, and a drive unit 41.
  • the output light quantity ratio determination unit 40 is configured to maintain white color temperature of the illumination light K before and after the operation for switching on / off the excitation light K2 and dimming operation of the white light K1.
  • the ratio of the output light amount (radiation intensity) of each light of the light source unit 24A and the auxiliary light source unit 24B is determined.
  • the output light quantity ratio determining unit 40 when the operation unit 12 receives an instruction operation of the color temperature of the illumination light K, the white light source unit 24A, the illumination light K of the instructed color temperature is emitted. And the ratio of the output light quantity (radiation intensity) of each light of the auxiliary light source part 24B is determined.
  • the output light quantity ratio determination unit 40 includes a storage unit 44 that stores a color temperature maintenance reference table 42 and a color temperature variable reference table 43, and the color temperature maintenance reference table 42 and color The output light quantity ratio is determined with reference to the temperature variable reference table 43.
  • FIG. 8 is a diagram schematically showing the color temperature maintenance reference table 42.
  • a ratio with each output light amount is defined. This ratio is also the ratio of the amount of emitted light of each color of the white light K1A and the auxiliary light K1B, and this ratio is defined for each presence / absence (lighting / extinguishing) of the excitation light K2.
  • the output light amount ratio defined for each dimming amount (%) of the white light K1 is the dimming amount of the white light K1 when the dimming amount of the white light K1 is changed without switching on / off the excitation light K2. Regardless of the amount, it defines a value at which the color temperature in the closed space simulating the body cavity 9 is maintained at a predetermined value.
  • the output light quantity ratio defined for each presence / absence (lighting / extinguishing) of the excitation light K2 is such that when the dimming amount of the white light K1 is fixed, the color temperature of the illumination light K is irrespective of the presence / absence of the excitation light K2. Defines the value maintained at a predetermined value. As these values, values obtained in advance by experiments are used.
  • the value of the output light quantity ratio is not directly defined, but the drive current of each LED that can obtain the output light quantity ratio is defined. Furthermore, the drive current of each LED is defined by a drive current adjustment ratio (LED drive current balance adjustment value (%) in the illustrated example).
  • the drive current adjustment ratio is a ratio display of the drive current flowing through the LED with reference to the drive current at the time of 100% dimming (maximum output) of the LED.
  • the output light amount ratio determining unit 40 switches between turning on / off the excitation light K2, and The drive current adjustment ratio corresponding to the dimming amount of the white light K1 is determined as the output light amount ratio.
  • the drive current adjustment ratio is specified by the output light quantity ratio determination unit 40 referring to the color temperature maintenance reference table 42. Then, the output light amount ratio determination unit 40 outputs the drive current adjustment ratios of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 to the drive unit 41 as the drive command value D5.
  • FIG. 9 is a diagram schematically showing the color temperature variable reference table 43.
  • the color temperature variable reference table 43 defines the output light quantity ratio for each color temperature (K) of the black body radiation locus in the range of 1500 (K) to 1500 (K).
  • the output light amount ratio is a ratio of output light amounts of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 from which white light K1 having the color temperature (K) is obtained.
  • the respective output light quantity ratios are defined by the drive current adjustment ratio (LED drive current balance adjustment value (%) in the illustrated example). Yes. Similar to the color temperature maintenance reference table 42, these values are obtained in advance through experiments.
  • the light source device 2 is configured such that the color temperature of the illumination light K (that is, the white light K1) is adjusted only when the excitation light K2 is turned off. For this reason, in the color temperature variable reference table 43, the drive current applied to the infrared LED of the infrared light source unit 25 is set to “zero”.
  • the output light amount ratio determination unit 40 refers to the color temperature variable reference table 43 and adjusts the drive current corresponding to the instructed color temperature of the white light K1. The ratio is determined as the output light quantity ratio. Then, the output light amount ratio determination unit 40 outputs the drive current adjustment ratios of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 to the drive unit 41 as the drive command value D5.
  • the method of defining the output light quantity ratio of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 is limited to this embodiment. is not.
  • the value of the output light amount of each LED may be directly specified, and instead of the output light amount, it is specified using another physical quantity such as the above-described drive current that indirectly indicates the output light amount. You can also. It is also possible to formulate the ratio of the output light quantity based on the experimental value and specify the ratio of the output light quantity based on the formula.
  • the drive unit 41 drives the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 to flow and drive the white LED 24A1, the red LED 24B1, and the blue LED 24B3.
  • the drive unit 41 includes a drive circuit 46 having the same configuration for each of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3.
  • Each drive circuit 46 carries out constant current control of the corresponding LED, and when a dimming amount is instructed, drives each LED based on the dimming amount.
  • the drive circuit 46 includes a drive current application circuit 50 that applies a drive current Ik to the corresponding LED, a command value output circuit 51, a drive current sensor 54, a current comparator 55, and a light quantity sensor 56. And a light quantity comparator 57.
  • the command value output circuit 51 generates a corresponding LED drive current command value Ic or output light quantity command value Pc based on the drive command value D5, and outputs it to the current comparator 55 or the light quantity comparator 57.
  • the drive current command value Ic is output when the corresponding LED is driven to light by constant current control.
  • the output light amount ratio determination unit 40 determines the drive current adjustment ratio based on the color temperature maintenance reference table 42 or the color temperature variable reference table 43, as described above, this drive current adjustment ratio is used as the drive command.
  • the value D5 is input to the command value output circuit 51.
  • the drive current adjustment ratio is determined for each of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3.
  • the command value output circuit 51 When the drive current adjustment ratio is indicated by the drive command value D5, the command value output circuit 51 generates a drive current command value Ic corresponding to the drive current adjustment ratio, and thereby the corresponding LED is determined. Current controlled.
  • the output light amount command value Pc is output when the dimming control is performed by specifying the output light amount of the corresponding LED.
  • the light source device 2 is configured such that the user can individually control the amount of light output from each of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 so that the dimming operation can be performed.
  • the output light amount ratio determination unit 40 instructs the dimming amount as the drive command value D5 without referring to the color temperature maintenance reference table 42 or the color temperature variable reference table 43. Input to the value output circuit 51.
  • the dimming amount is the dimming amount of each of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3.
  • the command value output circuit 51 When the light control amount is indicated by the drive command value D5, the command value output circuit 51 generates an output light amount command value Pc corresponding to the light control amount, and the output light amount of the corresponding LED is thereby determined. Adjusted.
  • the drive current sensor 54 is a current detection device that detects the drive current Ik applied to the corresponding LED and outputs it to the current comparator 55.
  • the current comparator 55 compares the drive current command value Ic with the detected value of the drive current Ik, and controls the drive current Ik applied by the drive current application circuit 50 so as to cancel out the deviation.
  • the drive current Ik is maintained at the drive current command value Ic, and the LED is driven to light as instructed by the drive command value D5.
  • the output light amount ratios of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 are accurately adjusted.
  • the light quantity sensor 56 is an optical sensor device that detects the output light quantity of the corresponding LED and outputs it to the light quantity comparator 57.
  • the light quantity comparator 57 compares the output light quantity command value Pc with the detected output light quantity value, and controls the drive current Ik applied by the drive current application circuit 50 so as to cancel out the deviation. As a result, the output light quantity is maintained at the output light quantity command value Pc, and the LED is dimmed and controlled as instructed by the drive command value D5.
  • FIG. 10 is a flowchart showing the operation of the light source device 2.
  • the operation is input to the light source control unit 14 (step S1).
  • the operation includes switching off / turning on the excitation light K2 emitted from the fluorescence observation light source 21, the dimming operation of the white light K1 emitted from the white light observation light source 20, and the white light K1.
  • the white light source unit control unit 30 included in the light source control unit 14 controls the white light source unit 24 to maintain white balance.
  • the color temperature of the white light K1 is adjusted. That is, in the white light source unit control unit 30, the output light quantity ratio determination unit 40 of the dimming unit 32 sets the color temperature maintaining reference table 42 or the color temperature variable reference table 43 according to the operation input in step S1. Read and reference (step S2). Specifically, when an operation for switching on / off the excitation light K2 and a dimming operation for the white light K1 are input, the color temperature maintaining reference table 42 is referred to, and the color temperature adjustment operation for the white light K1 is performed. Is input, the color temperature variable reference table 43 is referred to.
  • the output light amount ratio determining unit 40 determines the output light amount ratios of the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 based on the color temperature maintaining reference table 42 or the color temperature variable reference table 43 (step) S3). Then, the output light amount ratio determining unit 40 outputs the drive current adjustment value of each LED for obtaining the output light amount ratio to the drive unit 41 as the drive command value D5 (step S4). Specifically, when an operation for switching on / off the excitation light K2 and a dimming operation for the white light K1 are input, an output light amount ratio for maintaining white balance is determined.
  • the output light quantity ratio to be adjusted to the color temperature designated by the user operation is determined.
  • the output light quantity ratio between the LEDs is defined by the drive current adjustment value of the drive current Ik of each LED. Therefore, the output light amount ratio is also determined (step S3) by the output of the drive current adjustment value (step S4).
  • each drive circuit 46 carries out constant current control of corresponding LED based on the drive command value D5 (step S5).
  • the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 are turned on at the output light amount ratio determined by the output light amount ratio determining unit 40.
  • the extinction / lighting switching operation of the excitation light K2 and the dimming operation of the white light K1 are input, the extinction / lighting of the excitation light K2 is switched while maintaining the white balance. K1 is dimmed.
  • the white LED 24A1, the red LED 24B1, the green LED 24B2, and the blue LED 24B3 are turned on so that the color temperature specified by the user operation can be accurately obtained. It becomes.
  • the following effects can be obtained.
  • the white light K1A of the white light source unit 24A is maintained so that the color temperature of the illumination light K before switching is maintained after switching.
  • the output light quantity ratio of the light of each color included in the auxiliary light K1B of the auxiliary light source unit 24B is changed.
  • the light source device 2 dimmes the white light K1 in response to the dimming operation of the white light K1, the light output of each color of the white light K1A of the white light source unit 24A and the auxiliary light K1B of the auxiliary light source unit 24B is output.
  • the light quantity ratio is changed to an output light quantity ratio that maintains the color temperature in the closed space illuminated by the illumination light K before and after dimming.
  • the output light quantity ratio of each color of the white light K1A of the white light source unit 24A and the auxiliary light K1B of the auxiliary light source unit 24B is obtained as the color temperature specified by the color temperature adjustment operation of the white light K1.
  • the output light quantity ratio is changed.
  • the user can adjust the color temperature to a desired color and observe and observe the observation location C.
  • the configuration includes the combining optical element 24C that combines the auxiliary light K1B of the auxiliary light source unit 24B and the white light K1A of the white light source unit 24A on the same optical axis.
  • the auxiliary light source unit 24B is configured to radiate light having wavelengths of the three primary colors.
  • the selection range of the color temperature of the illumination light K to be kept constant can be expanded, and the color temperature of the white light K1 can be increased. It can be adjusted accurately and over a wide range along the black body radiation locus.
  • the white light source unit 24A and the auxiliary light source unit 24B are configured to include LEDs whose output light amount is variable according to the drive current Ik.
  • the light source control unit 14 includes data (color temperature maintenance reference table 42, color temperature variable reference table 43) that prescribes the value of the drive current Ik from which the above output light quantity ratio is obtained. Thereby, the instruction of the drive current Ik for the white light source unit 24A and the auxiliary light source unit 24B required for maintaining and adjusting the color temperature is accurately and promptly performed.
  • the white LED 24A1 of the white light source unit 24A the blue LED is sealed with the phosphor resin in which the yellow phosphor is dispersed, and the emission color of the blue LED and the fluorescent color of the yellow phosphor are mixed.
  • An LED that emits white light K1A is illustrated. However, any LED that emits white light can be used as the white light source unit 24A.
  • the configuration in which the fluorescence observation light source 21 emits the excitation light K2 in the infrared wavelength region is exemplified.
  • the light emitted from the fluorescence observation light source 21 can be light having any wavelength as long as the light partially overlaps within the wavelength band of the white LED 24A1 of the white light source unit 24A and the visible light wavelength band.
  • the purpose of using this light is not limited to the excitation of the fluorescent material, but is arbitrary.
  • the color temperature of the illumination light K is maintained and the white light K1 is changed by changing the output light quantity ratio between the white light K1 of the white light source unit 24A and the auxiliary light K1B of the auxiliary light source unit 24B.
  • a configuration for adjusting the color temperature is exemplified.
  • the excitation light K2 of the fluorescence observation light source 21 may be included in this output light quantity ratio.
  • the configuration in which the LED that is an example of the semiconductor light source is used as each light source included in the light source device 2 is exemplified, but the present invention is not limited thereto, and other semiconductor light sources such as organic EL and LD may be used. good.
  • an endoscope is used as a photographing observation system that illuminates the observation portion C with the illumination light K of the light source device 2, photographs with the photographing camera 4B, and displays the photographed image on the display device 6 for observation.
  • System 1 is illustrated.
  • the present invention is not limited to this, and can be used for microscopic observation.
  • the light source device 2 of the above-described embodiment can emit illumination light K having an accurate color temperature according to the black body radiation locus, it can be used as a light source for illuminating the printed matter for chromaticity inspection of the printed matter. it can.

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Abstract

La présente invention vise à supprimer des changements d'équilibre des blancs d'une image photographique, même si la quantité de lumière d'éclairage change. L'invention concerne un dispositif de source de lumière (2) comprenant une unité de source de lumière blanche (24A) qui rayonne une lumière blanche (K1A), et une unité de source de lumière infrarouge (25) qui rayonne une lumière d'excitation (K2) d'une bande de longueur d'onde (ΔE2) en chevauchement partiel avec une bande de longueur d'onde (ΔE1) de la lumière blanche( K1A) à l'intérieur de la bande de longueur d'onde de lumière visible, ledit dispositif de source de lumière (2) étant configuré pour composer la lumière blanche (K1A) et la lumière d'excitation (K2) dans le même axe optique, projeter une lumière d'éclairage (K) pour la photographie, et étant capable de commuter la lumière d'excitation (K2) sur marche et arrêt. Le dispositif de source de lumière (2) comprend en outre : une unité de source de lumière auxiliaire (24B) qui rayonne une lumière de différentes longueurs d'onde à l'intérieur de la bande de longueur d'onde de lumière visible ; et une unité de commande de source de lumière (14), laquelle, lorsque la lumière d'excitation (K2) est mise sur marche et arrêt, change le rapport de quantité de lumière émise de la lumière blanche (K1A) de l'unité de source de lumière blanche (24A) et de la lumière auxiliaire (K1B) de l'unité de source de lumière auxiliaire (24B), de telle sorte que la température de couleur de la lumière d'éclairage K avant la commutation est préservée.
PCT/JP2015/079262 2014-11-19 2015-10-16 Dispositif de source de lumière et système d'observation photographique WO2016080121A1 (fr)

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WO2019008942A1 (fr) * 2017-07-03 2019-01-10 富士フイルム株式会社 Dispositif de traitement d'image médicale, dispositif d'endoscope, dispositif de support de diagnostic, dispositif de support de service médical et dispositif de support de génération de rapport

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WO2018003263A1 (fr) * 2016-06-27 2018-01-04 ソニー株式会社 Dispositif d'observation et procédé de commande pour dispositif d'observation
US10835102B2 (en) * 2016-07-28 2020-11-17 Verily Life Sciences Llc Tunable color-temperature white light source
WO2018076180A1 (fr) * 2016-10-25 2018-05-03 深圳迈瑞生物医疗电子股份有限公司 Appareil médical de source lumineuse

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JP2010158413A (ja) * 2009-01-08 2010-07-22 Hoya Corp 内視鏡用光源装置
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WO2019008942A1 (fr) * 2017-07-03 2019-01-10 富士フイルム株式会社 Dispositif de traitement d'image médicale, dispositif d'endoscope, dispositif de support de diagnostic, dispositif de support de service médical et dispositif de support de génération de rapport
JPWO2019008942A1 (ja) * 2017-07-03 2020-05-07 富士フイルム株式会社 医療画像処理装置、内視鏡装置、診断支援装置、医療業務支援装置、及び、レポート作成支援装置
US11416985B2 (en) 2017-07-03 2022-08-16 Fujifilm Corporation Medical image processing apparatus, endoscope apparatus, diagnostic support apparatus, medical service support apparatus, and report creation support apparatus

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