WO2016027717A1 - 光源装置 - Google Patents
光源装置 Download PDFInfo
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- WO2016027717A1 WO2016027717A1 PCT/JP2015/072634 JP2015072634W WO2016027717A1 WO 2016027717 A1 WO2016027717 A1 WO 2016027717A1 JP 2015072634 W JP2015072634 W JP 2015072634W WO 2016027717 A1 WO2016027717 A1 WO 2016027717A1
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- 238000005286 illumination Methods 0.000 description 41
- 230000003595 spectral effect Effects 0.000 description 29
- 230000003287 optical effect Effects 0.000 description 20
- 210000004400 mucous membrane Anatomy 0.000 description 18
- 238000001228 spectrum Methods 0.000 description 17
- 238000000295 emission spectrum Methods 0.000 description 6
- 210000004877 mucosa Anatomy 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 210000004204 blood vessel Anatomy 0.000 description 3
- 239000006059 cover glass Substances 0.000 description 3
- 238000009877 rendering Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009278 visceral effect Effects 0.000 description 1
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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
-
- 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
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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
- A61B1/0646—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 with illumination filters
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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
- A61B1/0655—Control therefor
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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
- A61B1/0661—Endoscope light sources
- A61B1/0669—Endoscope light sources at proximal end of an endoscope
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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
- A61B1/0661—Endoscope light sources
- A61B1/0684—Endoscope light sources using light emitting diodes [LED]
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- A—HUMAN NECESSITIES
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/12—Combinations of only three kinds of elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
-
- 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
- G02B23/2407—Optical details
- G02B23/2461—Illumination
- G02B23/2469—Illumination using optical fibres
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29388—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM for lighting or use with non-coherent light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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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
- A61B1/063—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 for monochromatic or narrow-band illumination
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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
- A61B1/0653—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 with wavelength conversion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2113/00—Combination of light sources
- F21Y2113/10—Combination of light sources of different colours
- F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
Definitions
- the present invention relates to a light source device.
- Patent Document 3 uses a white LED in addition to a red, green, and blue LED, and corrects the spectrum in the green wavelength region by using a partial component of white light emitted by the white LED. The color temperature of the illumination light is adjusted.
- the mucous membrane is illuminated with illumination light that lacks a spectrum in the wavelength range from green to red, it is not possible to express subtle differences in the mucous membrane color, and the mucous membrane color tone is accurately displayed in an endoscopic image. There is an inconvenience that it cannot be reproduced.
- the present invention has been made in view of the above-described circumstances, and provides a light source device capable of generating illumination light having good spectral characteristics with little wavelength loss in order to ensure better color reproducibility.
- the purpose is to do.
- the present invention includes a long wavelength light source that emits a long wavelength light having a peak wavelength in a red wavelength range, a green wavelength range of 500 nm to 580 nm and a peak wavelength of 580 nm or less, and a short wavelength of the long wavelength light.
- a light source device having a wavelength at which the intensity is 10% or more of the peak intensity and the intensity of the broadband light is 10% or more of the peak intensity.
- the long-wavelength light emitted from the long-wavelength light source and the broadband light emitted from the broadband light source and having a spectrum in the red wavelength range are combined into one by the multiplexing unit.
- illumination light having no missing spectrum is generated at least in the wavelength range from green to red.
- the long-wavelength light and the broadband light combined by the multiplexing unit are sufficient for at least 10% of the peak intensity in the wavelength region between the peak wavelength of the long-wavelength light and the peak wavelength of the broadband light.
- red wavelength range means a wavelength range of about 580 nm to about 760 nm, and includes orange.
- Green wavelength range means a wavelength range of about 500 nm to about 580 nm.
- the “blue wavelength range” means a wavelength range of about 380 nm to about 500 nm, and includes purple.
- the said broadband light has the said peak wavelength in the range of 500 nm to 580 nm.
- two short wavelength light sources each emitting short wavelength light having different peak wavelengths in the blue wavelength range are provided, and one of the short wavelength lights having a peak wavelength on the long wavelength side is equal to or less than a predetermined wavelength.
- the multiplexing unit has one of the long-wavelengths having a peak wavelength on the long-wavelength side
- a wavelength range of light longer than a predetermined wavelength and the other wavelength range of the other long wavelength light having a peak wavelength on the short wavelength side are combined, and the predetermined wavelength is It may be a wavelength at which the intensity of one long wavelength light is 10% or more of the peak intensity and the intensity of the other long wavelength light is 10% or more of the peak intensity.
- the intensity ratio adjustment part which adjusts the intensity ratio of the light combined by the said multiplexing part.
- 1 is an overall configuration diagram of a light source device according to an embodiment of the present invention.
- 2 is a graph showing emission spectra (left axis) of blue, green, and red LEDs included in the light source device of FIG. 1 and spectral transmittances (right axis) of first and second dichroic filters. It is a graph which shows the spectrum (left axis) of the illumination light produced
- the spectral transmittance (right axis) of a 3rd dichroic filter It is a graph which shows the emission spectrum (left axis) of the blue LED and purple LED with which the light source device of FIG. 4 is provided, and the spectral reflectance (right axis) of a mucous membrane. It is a whole block diagram which shows another modification of the light source device of FIG. It is a graph which shows the emission spectrum (left axis) of red LED and orange LED with which the light source device of FIG. 7 is provided, and the spectral transmittance (right axis) of a 4th dichroic filter.
- 11 is a graph showing emission spectra (left axis) of blue, green and red LEDs included in the light source device of FIG. 10 and spectral transmittances (right axis) of first and second dichroic filters.
- the light source device 1 which concerns on one Embodiment of this invention is demonstrated with reference to drawings.
- the light source device 1 combines three LEDs 21, 22, 23 and three lights Lb, Lg, Lr emitted from the LEDs 21, 22, 23 into one.
- Two dichroic filters 31 and 32 that generate white illumination light Lw by wave generation, three collimator lenses 4 arranged immediately after each of the LEDs 21, 22, and 23, and a dichroic filter (multiplexing unit) 31 , 32, and a converging lens 5 for converging the illumination light Lw generated.
- FIG. 2 shows the spectra of the light Lb, Lg and Lr emitted from the LEDs 21, 22 and 23 and the light transmission characteristics of the dichroic filters 31 and 32.
- the intensities of the light Lb, Lg, and Lr are standardized with the maximum value of each being 1.
- the LEDs 21, 22, and 23 include a single blue LED (short wavelength light source) 21 that emits blue light (short wavelength light) Lb, a single green LED (wide band light source) 22 that emits green light (broadband) Lg, It is a single red LED (long wavelength light source) 23 that emits red light (long wavelength light) Lr.
- the blue light Lb is a narrow band light having a half-width spectrum of about 20 nm to 30 nm, and has a peak wavelength of about 460 nm.
- the red light Lr is a narrow band light having a half-width spectrum of about 20 nm to 30 nm, and has a peak wavelength at about 630 nm.
- the green light Lg is a broadband light composed of a spectrum with a half width of about 100 nm or more, and has a peak wavelength of about 550 nm. That is, the green light Lg also has a spectrum in the red wavelength region, and the wavelength region on the long wavelength side of the green light Lg overlaps at least the wavelength region on the short wavelength side of the red light Lr.
- the green LED 22 is arranged so that its emission optical axis intersects with the emission optical axis A of the blue LED 21.
- the red LED 23 is disposed so that the emission optical axis thereof intersects the emission optical axis A of the blue LED 21 at a position farther from the blue LED 21 than the green LED 22.
- the first dichroic filter 31 is a short-pass filter having a cutoff wavelength (predetermined wavelength) ⁇ cut1 at about 500 nm, transmits light having a wavelength equal to or shorter than the cutoff wavelength ⁇ cut1, and is longer than the cutoff wavelength ⁇ cut1.
- Reflects light having The second dichroic filter 32 is a short pass filter having a cutoff wavelength ⁇ cut2 between the peak wavelength of the green light Lg and the peak wavelength of the red light Lr, and transmits light having a wavelength equal to or shorter than the cutoff wavelength ⁇ cut2. The light having a wavelength longer than the cutoff wavelength ⁇ cut2 is reflected.
- the first dichroic filter 31 is disposed at a position where the emission optical axis A of the blue LED 21 and the emission optical axis of the green LED 22 intersect.
- the first dichroic filter 31 transmits all of the blue light Lb emitted from the blue LED 21 along the output optical axis A, while most of the green light Lg emitted from the green LED 22 extends along the output optical axis A. Reflect.
- the second dichroic filter 32 is disposed at a position where the emission optical axis A of the blue LED 21 and the emission optical axis of the red LED 23 intersect.
- the second dichroic filter 32 transmits all of the blue light Lb along the output optical axis A, while the green light Lg reflected by the first dichroic filter 31 has a longer wavelength range than the cutoff wavelength ⁇ cut2.
- the second dichroic filter 32 reflects the wavelength range longer than the cutoff wavelength ⁇ cut2 of the red light Lr emitted from the red LED 23 along the output optical axis A, and has a wavelength equal to or shorter than the cutoff wavelength ⁇ cut2. Make the area transparent.
- the blue, green, and red lights Lb, Lg, and Lr are combined to generate the white illumination light Lw.
- the generated illumination light Lw is converged on the cover glass 6 on the optical axis A by the converging lens 5, and the illumination light Lw is output from the cover glass 6 to the outside of the light source device 1.
- the cutoff wavelength ⁇ cut2 of the second dichroic filter 32 is such that the intensity of the green light Lg at the cutoff wavelength ⁇ cut2 is 10% or more of the peak intensity of the green light Lg and the red light at the cutoff wavelength ⁇ cut2
- the intensity of Lr is set to a wavelength that is 10% or more of the peak intensity of the red light Lr.
- the cutoff wavelength ⁇ cut2 is set to about 615 nm.
- the intensities of the lights Lr and Lg at the cutoff wavelength ⁇ cut2 are less than 10% of the peak intensities, a wavelength region with insufficient intensity may be generated in the vicinity of the cutoff wavelength ⁇ cut2 of the illumination light Lw. As a result, it becomes difficult to ensure good color reproducibility of the illumination light Lw described later.
- Each collimator lens 4 is a convex lens in which a focal point is disposed on the light emitting portion of each LED 21, 22, 23, and receives light Lb, Lg, Lr emitted as a diffused light beam from the light emitting portion of LED 21, 22, 23, respectively.
- the light is converted into a parallel light beam having substantially the same light beam diameter, and is emitted to the dichroic filters 31 and 32, respectively.
- the blue light Lb, the green light Lg, and the red light Lr are combined to generate the illumination light Lw.
- Reference numeral 7 denotes a light guide for illuminating the endoscope connected to the light source device 1.
- the three color lights Lb, Lg, and Lr emitted from the respective LEDs 21, 22, and 23 are multiplexed on the same emission optical axis A by the two dichroic filters 31 and 32, whereby the second dichroic filter 32.
- white illumination light Lw is generated.
- the generated illumination light Lw is converged by the converging lens 5 and enters the light guide 7.
- the illumination light Lw incident on the light guide 7 guides the light guide 7 to the tip of the light guide 7 disposed at the tip of the endoscope, and is irradiated from the tip of the endoscope toward the observation target.
- the reflected light of the illumination light Lw from the observation target is received by an image sensor such as a CCD image sensor built in the distal end of the endoscope and is converted into a color image.
- the spectral reflectance of the mucous membrane varies greatly in the wavelength range from 500 nm to 650 nm, as shown in FIG.
- the intensity of the illumination light Lw is standardized with a maximum value of 1.
- a conventional light source device 1 ′ will be described with reference to FIGS. 10 to 12.
- the basic configuration of the light source device 1 ′ is substantially the same as that of the light source device 1 according to the present embodiment, and the blue LED 21 ′, the red LED 23 ′, the first dichroic filter 31 ′, and the collimator lens 4.
- the focusing lens 5' are configured in the same manner as the blue LED 21, the red LED 23, the first dichroic filter 31, the collimator lens 4, and the focusing lens 5, respectively.
- the optical characteristics of the green LED 22 ′ and the second dichroic filter 32 ′ of the conventional light source device 1 ′ are different from the optical characteristics of the green LED 22 and the second dichroic filter 32, respectively. .
- the spectrum of the generated illumination light Lw ′ is as shown in FIG.
- the wavelength is lost in the green to red wavelength region where the spectral reflectance of the mucosa changes greatly. This means that the color of the mucous membrane cannot be accurately reproduced when the mucosa is irradiated with the illumination light Lw ′.
- the illumination light Lw generated by combining the broadband green light Lg and the red light Lr has a continuous spectrum with little wavelength loss over the entire wavelength range from 500 nm to 650 nm.
- the cutoff wavelength ⁇ cut2 of the second dichroic filter 32 that combines the green light Lg and the red light Lr is such that both the light Lg and Lr have an intensity of 10% or more of the peak intensity of the light Lg and Lr.
- the wavelength is set to have.
- the illumination light Lw has sufficient intensity at the cutoff wavelength ⁇ cut2 where the intensity is relatively low in the wavelength range of 500 nm to 650 nm and in the vicinity thereof, and is 500 nm to 650 nm. It has good spectral characteristics with little wavelength loss over the entire wavelength range.
- Such illumination light Lw is advantageous for reproducing a subtle difference in hue between green and red that the mucous membrane has.
- the delicate color of the mucous membrane can be accurately reproduced. There is an advantage that you can.
- FIG. 4 shows a violet LED (short wavelength light source) 24 that emits a narrow-band violet light (short wavelength light) Lp having a single peak wavelength from about 410 to 420 nm, and emits violet light Lp and blue light Lb.
- a configuration further including a third dichroic filter 33 that multiplexes on the axis A is shown.
- the third dichroic filter 33 is a short-pass filter having a cutoff wavelength ⁇ cut3 between the peak wavelength of the blue light Lb and the peak wavelength of the violet light Lp.
- the third dichroic filter 33 transmits substantially all of the violet light Lp along the emission optical axis A and reflects most of the blue light Lb along the emission optical axis A.
- the cutoff wavelength ⁇ cut3 is set to about 440 nm.
- the short wavelength region of the blue light Lb below a predetermined wavelength (about 430 nm in the example shown in FIGS. 5 and 6) and the long wavelength region longer than the predetermined wavelength of the violet light Lp are: Overlapping each other.
- the predetermined wavelength is set to a wavelength at which the intensity of the blue light Lb is 10% or more of the peak intensity and the intensity of the violet light Lp is 10% or more of the peak intensity.
- the illumination light Lw has a spectral characteristic with few wavelength loss in all the wavelengths of a blue wavelength range.
- the spectral reflectance of the mucosa varies depending on the wavelength even in the blue wavelength region. Therefore, by combining the two LEDs 21 and 24 having the peak wavelength in the blue wavelength region, it is possible to obtain good spectral characteristics with little wavelength loss even in the blue wavelength region of the illumination light Lw. Thus, even in blue, there is an advantage that the subtle difference in blue color of the mucous membrane can be accurately expressed by illuminating the mucous membrane with the illumination light Lw having excellent color rendering properties. 5 and 6, the intensities of the light beams Lb and Lp are normalized with the maximum value of each being 1.
- FIG. 7 shows an orange LED (long wavelength light source) 25 that emits narrow band orange light (long wavelength light) Lo having a peak wavelength at about 600 nm and an orange light Lo on the emission optical axis A in addition to the configuration of FIG. 4 shows a configuration further including a fourth dichroic filter 34 for multiplexing.
- the fourth dichroic filter 34 is a short pass filter having a cutoff wavelength between the peak wavelength of the green light Lg and the peak wavelength of the orange light Lo. The cutoff wavelength is set to about 580 nm, for example.
- the cutoff wavelength (predetermined wavelength) ⁇ cut2 of the second dichroic filter 32 is located between the peak wavelength of the orange light Lo and the peak wavelength of the red light Lr.
- the intensity of the red light Lr at the cutoff wavelength ⁇ cut2 is 10% or more of the peak intensity of the red light Lr, and the intensity of the orange light Lo at the cutoff wavelength ⁇ cut2 is 10% of the peak intensity of the orange light Lo. % Or more.
- the spectral reflectance of the mucosa and blood vessels existing in the mucosa varies depending on the wavelength in the red wavelength region. Therefore, by combining the two LEDs 23 and 25 having the peak wavelength in the red wavelength region, good spectral characteristics with little wavelength loss can be obtained even in the red wavelength region of the illumination light Lw. Thus, even in red, there is an advantage that the subtle difference in red color between the mucous membrane and the blood vessel can be accurately expressed by illuminating the mucous membrane with the illumination light Lw excellent in color rendering. 8 and 9, the intensities of the light Lb and Lo are standardized with the maximum value of each being 1.
- an intensity ratio adjusting unit that adjusts the intensity ratio of the light Lb, Lg, Lr, Lp, Lo combined by the dichroic filters 31, 32, 33, 34 may be further provided.
- the intensity ratio adjustment unit is, for example, a power supply (not shown) that supplies current to each of the LEDs 21, 22, 23, 24, 25, and individually determines the magnitude of the current supplied to each of the LEDs 21, 22, 23, 24, 25
- the light emission intensity of each of the LEDs 21, 22, 23, 24, and 25 can be adjusted independently of each other, whereby the intensity ratio of the light Lb, Lg, Lr, Lp, and Lo can be adjusted.
- the image sensor does not have the same detection sensitivity for light of all wavelengths, but the detection sensitivity differs for each wavelength.
- the spectral characteristics of the illumination light Lw so as to be optimal for such spectral sensitivity characteristics of the image sensor, better color reproducibility can be ensured in an image acquired by the image sensor.
- the green LED 22 that emits broadband green light is used as the broadband light source.
- a light source that emits white light such as a white LED, may be used.
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Abstract
Description
本発明は、赤色の波長域にピーク波長を有する長波長光を発する長波長光源と、500nmから580nmの緑色の波長域を含むとともに580nm以下にピーク波長を有し、前記長波長光の短波長側の波長域と重複する波長域を長波長側に有する広帯域を発する単一の広帯域光源と、前記長波長光の、所定の波長よりも長い波長域と、前記広帯域光の、前記所定の波長以下の波長域とを合波する合波部とを備え、前記所定の波長は、前記長波長光のピーク波長と前記広帯域光のピーク波長との間の波長であるとともに、前記長波長光の強度がそのピーク強度の10%以上となり、かつ、前記広帯域光の強度がそのピーク強度の10%以上となる波長である光源装置を提供する。
この場合に、合波部によって合波される長波長光および広帯域光は、長波長光のピーク波長と広帯域光のピーク波長との間の波長域において、各々のピーク強度の10%以上の十分に高い強度を有する。これにより、波長欠落の少ない良好なスペクトル特性を有し、より良い色再現性を確保することが可能な照明光を生成することができる。
このようにすることで、照明光の、特に緑色から赤色の波長域においてより高いスペクトルの強度を確保し、より良好なスペクトル特性を得ることができる。
このようにすることで、特に青色の波長域における分光反射率が一定では無い物体を照明する際に、該物体の色合いをより正確に表現することができる。
このようにすることで、特に赤色の波長域における分光反射率が一定ではない物体を照明する際に、該物体の色合いをより正確に表現することができる。
このようにすることで、照明光によって照明された物体を撮像素子によって撮影する場合に、照明光のスペクトル特性を、撮像素子の分光感度特性に対して最適化することができる。
本実施形態に係る光源装置1は、図1に示されるように、3個のLED21,22,23と、LED21,22,23から射出された3つの光Lb,Lg,Lrを1つに合波して白色の照明光Lwを生成する2個のダイクロイックフィルタ31,32と、各LED21,22,23の直後段に配置された3個のコリメータレンズ4と、ダイクロイックフィルタ(合波部)31,32によって生成された照明光Lwを収束させる収束レンズ5とを備えている。
LED21,22,23は、青色光(短波長光)Lbを発する単一の青色LED(短波長光源)21と、緑色光(広帯域)Lgを発する単一の緑色LED(広帯域光源)22と、赤色光(長波長光)Lrを発する単一の赤色LED(長波長光源)23である。
赤色光Lrは、約20nmから30nmの半値幅のスペクトルからなる狭帯域光であり、約630nmにピーク波長を有する。
緑色光Lgは、約100nm以上の半値幅のスペクトルからなる広帯域光であり、約550nmのピーク波長を有する。すなわち、緑色光Lgは、赤色の波長域にもスペクトルを有し、緑色光Lgの長波長側の波長域は、赤色光Lrの、少なくとも短波長側の波長域と重複している。
第2のダイクロイックフィルタ32は、緑色光Lgのピーク波長と赤色光Lrのピーク波長との間にカットオフ波長λcut2を有するショートパスフィルタであり、カットオフ波長λcut2以下の波長を有する光を透過させ、カットオフ波長λcut2よりも長い波長を有する光を反射する。
各LED21,22,23から射出された3色の光Lb,Lg,Lrは、2つのダイクロイックフィルタ31,32によって同一の射出光軸A上に合波されることによって、第2のダイクロイックフィルタ32の後段において白色の照明光Lwを生成する。生成された照明光Lwは、収束レンズ5によって収束され、ライトガイド7へ入射する。
図4は、約410から420nmに単一のピーク波長を有する狭帯域の紫色光(短波長光)Lpを発する紫色LED(短波長光源)24と、紫色光Lpと青色光Lbとを射出光軸A上に合波する第3のダイクロイックフィルタ33とをさらに備えた構成を示している。
なお、図5および図6において、光Lb,Lpの強度は、各々の最大値を1として規格化されている。
なお、図8および図9において、光Lb,Loの強度は、各々の最大値を1として規格化されている。
21 青色LED(短波長光源)
22 緑色LED(広帯域光源)
23 赤色LED(長波長光源)
24 紫色LED(短波長光源)
25 橙LED(長波長光源)
31,32,33,34 ダイクロイックフィルタ(合波部)
4 コリメータレンズ
5 収束レンズ
6 カバーガラス
7 ライトガイド
Claims (5)
- 赤色の波長域にピーク波長を有する長波長光を発する長波長光源と、
500nmから580nmの緑色の波長域を含むとともに580nm以下にピーク波長を有し、前記長波長光の短波長側の波長域と重複する波長域を長波長側に有する広帯域光を発する単一の広帯域光源と、
前記長波長光の、所定の波長よりも長い波長域と、前記広帯域光の、前記所定の波長以下の波長域とを合波する合波部とを備え、
前記所定の波長は、前記長波長光のピーク波長と前記広帯域光のピーク波長との間の波長であるとともに、前記長波長光の強度がそのピーク強度の10%以上となり、かつ、前記広帯域光の強度がそのピーク強度の10%以上となる波長である光源装置。 - 前記広帯域光が、500nmから580nmの範囲内に前記ピーク波長を有する請求項1に記載の光源装置。
- 互いに異なるピーク波長を青色の波長域に有する短波長光をそれぞれ発する少なくとも2つの短波長光源を備え、
長波長側のピーク波長を有する一方の前記短波長光の、所定の波長以下の波長域と、短波長側のピーク波長を有する他方の前記短波長光の、前記所定の波長よりも長い波長域とが、互いに重複し、
前記所定の波長は、前記一方の短波長光の強度がそのピーク強度の10%以上となり、かつ、前記他方の短波長光の強度がそのピーク強度の10%以上となる波長である請求項1または請求項2に記載の光源装置。 - 互いに異なるピーク波長を赤色の波長域に有する長波長光をそれぞれ発する少なくとも2つの長波長光源を備え、
前記合波部が、長波長側のピーク波長を有する一方の前記長波長光の、所定の波長よりも長い波長域と、短波長側のピーク波長を有する他方の前記長波長光の、前記所定の波長以下の波長域とを合波し、
前記所定の波長は、前記一方の長波長光の強度がそのピーク強度の10%以上となり、かつ、前記他方の長波長光の強度がそのピーク強度の10%以上となる波長である請求項1から請求項3のいずれかに記載の光源装置。 - 前記合波部によって合波される光の強度比を調整する強度比調整部を備える請求項1から請求項4のいずれかに記載の光源装置。
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JP2019080624A (ja) * | 2017-10-27 | 2019-05-30 | ソニー・オリンパスメディカルソリューションズ株式会社 | 医療用光源装置及び医療用内視鏡装置 |
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