WO2017141416A1 - Dispositif de source de lumière destiné à un endoscope - Google Patents

Dispositif de source de lumière destiné à un endoscope Download PDF

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Publication number
WO2017141416A1
WO2017141416A1 PCT/JP2016/054811 JP2016054811W WO2017141416A1 WO 2017141416 A1 WO2017141416 A1 WO 2017141416A1 JP 2016054811 W JP2016054811 W JP 2016054811W WO 2017141416 A1 WO2017141416 A1 WO 2017141416A1
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WIPO (PCT)
Prior art keywords
light
light source
phosphor
emitted
source unit
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Ceased
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PCT/JP2016/054811
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English (en)
Japanese (ja)
Inventor
邦彦 尾登
文香 横内
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Hoya Corp
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Hoya Corp
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Priority to PCT/JP2016/054811 priority Critical patent/WO2017141416A1/fr
Priority to CN201790000597.7U priority patent/CN209091323U/zh
Priority to PCT/JP2017/006123 priority patent/WO2017142096A1/fr
Priority to JP2018500243A priority patent/JP6695416B2/ja
Publication of WO2017141416A1 publication Critical patent/WO2017141416A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an endoscope light source device for irradiating a subject with light.
  • Patent Document 1 An endoscope system that can change the spectral intensity characteristics of irradiated light and take a special image is known.
  • Patent Document 1 a pamphlet of International Publication No. 2012/108420 (hereinafter referred to as “Patent Document 1”) describes a specific configuration of a light source device used in this type of endoscope system.
  • the endoscope system described in Patent Document 1 includes a light source device on which two light emitting diodes (LEDs) are mounted and an optical filter.
  • One of the two LEDs is a purple LED that emits light in a purple wavelength band.
  • the other LED is a phosphor LED having a blue LED and a yellow phosphor, and emits pseudo white light by mixing blue LED light and yellow fluorescence.
  • the optical filter is a wavelength selection filter that passes only light in a wavelength band having high absorbance with respect to a specific living tissue, and can be inserted into and extracted from the optical path of light emitted from the phosphor LED.
  • the light source device described in Patent Document 1 when the optical filter is removed from the optical path, the light emitted from the phosphor LED is irradiated to the subject as white light without limiting the wavelength band. .
  • the optical filter when the optical filter is inserted on the optical path, the subject is irradiated with both the irradiation light emitted from the phosphor LED and the wavelength band limited and the irradiation light emitted from the purple LED.
  • the spectral intensity characteristic of the irradiation light and irradiating the subject with only light in a specific wavelength band, it is possible to obtain a captured image in which a specific tissue is emphasized among subjects in the living body.
  • the wavelength band of irradiation light emitted from the white LED is limited by an optical filter, and an unnecessary wavelength band is obtained.
  • the light is cut. Since the cut light is not irradiated to the subject, there is a problem that the light use efficiency of the light source device is low.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is for an endoscope capable of irradiating irradiation light having high intensity only in a specific wavelength band with high light utilization efficiency.
  • a light source device is provided.
  • An endoscope light source device is excited by a first solid-state light emitting element that emits light of a first wavelength band and light of a first wavelength band, and emits first fluorescence.
  • a first light source unit having a first phosphor that emits, and a phosphor insertion / extraction means that supports the first phosphor so as to be insertable / removable with respect to an optical path of light emitted from the first solid-state light emitting element, Is provided.
  • the first phosphor is inserted into the optical path of the light emitted from the first solid state light emitting device by the phosphor inserting / extracting means, the first wavelength band of light and the first wavelength band are transmitted from the first light source unit.
  • the first phosphor is removed from the optical path of the light emitted from the first solid state light emitting device by the phosphor insertion / extraction means, the light of the first wavelength band is emitted from the first light source unit. Supplied to the endoscope.
  • the subject can be irradiated with normal light having a wide wavelength band in the visible light region by inserting the phosphor into the optical path of the light emitted from the solid state light emitting device. Further, by removing the phosphor from the optical path, it is possible to irradiate the subject with special light whose intensity of light in a wavelength band having high absorbance with respect to a specific biological tissue of the subject is higher than in other wavelength bands.
  • an optical filter such as a wavelength limiting filter when switching the spectral intensity characteristics of the irradiation light, it is possible to suppress light amount loss due to switching of the spectral intensity characteristics.
  • the endoscope light source device includes, for example, a second light source unit that emits light in a wavelength band having a peak wavelength different from the peak wavelength of the first fluorescence wavelength band; First optical path synthesis means for synthesizing the optical path of the light emitted from the first light source unit and the optical path of the light emitted from the second light source unit, and supplying the combined light to the endoscope Are further provided.
  • the second light source unit is excited by the second solid light emitting element and the light emitted from the second solid light emitting element, and emits second fluorescence. And a phosphor.
  • the peak wavelength of the second fluorescence wavelength band is different from the peak wavelength of the first wavelength band and the peak wavelength of the first fluorescence wavelength band.
  • the endoscope light source device is different from the peak wavelength of light emitted from the first light source unit and the peak wavelength of light emitted from the second light source unit, for example.
  • a third light source unit that emits light in a third wavelength band having a peak wavelength, an optical path of light synthesized by the first optical path synthesis unit, and an optical path of light emitted from the third light source unit
  • a second optical path synthesizing unit that synthesizes and supplies the combined optical path to the endoscope.
  • the first light source unit is excited by, for example, light in the first wavelength band emitted from the first solid state light emitting device, and is different from the peak wavelength of the first fluorescence.
  • a third phosphor that emits third fluorescence having a peak wavelength is further included.
  • the first phosphor is inserted into the optical path of the light emitted from the first solid-state light emitting element by the phosphor insertion / extraction means, the light in the first wavelength band from the first light source unit, the first Fluorescence and third fluorescence are emitted along the same optical path and supplied to the endoscope.
  • the first wavelength band and the third fluorescence are the same from the first light source unit. And are supplied to the endoscope.
  • the first light source unit is excited by, for example, light in the first wavelength band emitted from the first solid-state light emitting element, and the first fluorescence peak wavelength and the third wavelength.
  • a fourth phosphor that emits a fourth fluorescence having a peak wavelength different from the peak wavelength of the fluorescence.
  • the phosphor insertion / extraction means supports the first phosphor and the fourth phosphor so that they can be individually inserted into and removed from the optical path of the light emitted from the first solid state light emitting device.
  • an endoscope light source device capable of irradiating irradiation light having high intensity only in a specific wavelength band with high light use efficiency.
  • FIG. 1 is a block diagram illustrating a configuration of an electronic endoscope system according to a first embodiment of the present invention. It is a block diagram of the light source device for endoscopes concerning a 1st embodiment of the present invention. It is a block diagram of the light source device for endoscopes concerning a 1st embodiment of the present invention. It is a figure which shows the spectral intensity distribution of the irradiation light inject
  • FIG. 1 is a block diagram showing a configuration of an electronic endoscope system 1 including an endoscope light source device 201 according to the first embodiment of the present invention.
  • the electronic endoscope system 1 is a system specialized for medical use, and includes an electronic scope 100, a processor 200, and a monitor 300.
  • the processor 200 includes a system controller 21 and a timing controller 22.
  • the system controller 21 executes various programs stored in the memory 23 and controls the entire electronic endoscope system 1 in an integrated manner.
  • the system controller 21 is connected to the operation panel 24.
  • the system controller 21 changes each operation of the electronic endoscope system 1 and parameters for each operation in accordance with an instruction from the operator input to the operation panel 24.
  • the input instruction by the operator includes, for example, an instruction to switch the observation mode of the electronic endoscope system 1.
  • the observation mode includes a normal observation mode and a special observation mode. Details of each observation mode will be described later.
  • the timing controller 22 outputs a clock pulse for adjusting the operation timing of each unit to each circuit in the electronic endoscope system 1.
  • the processor 200 includes a light source device 201.
  • FIG. 2 is a block diagram of the light source device 201 according to the first embodiment of the present invention.
  • the light source device 201 includes a first light source unit 111 and a second light source unit 112.
  • the first and second light source units 111 and 112 are individually controlled to emit light by the first and second light source drive circuits 141 and 142, respectively.
  • the first light source unit 111 includes a purple light emitting diode (LED: Light Emitting Diode) 111a that emits light in a purple wavelength band (for example, a wavelength of 395 to 435 nm) and a blue phosphor 111b.
  • the blue phosphor 111b is excited by the purple LED light emitted from the purple LED 111a and emits fluorescence in a blue wavelength band (for example, a wavelength of 430 to 550 nm).
  • the blue phosphor 111b is supported by the phosphor insertion / extraction mechanism 151 so that it can be inserted into and removed from the optical path. Specifically, the blue phosphor 111b is inserted into or removed from the optical path of the purple LED light emitted from the purple LED 111a according to the observation mode. As shown by a solid line in FIG. 2, when the blue phosphor 111b is inserted on the optical path of the purple LED light, the blue phosphor 111b emits blue fluorescence. Thereby, both the purple LED light and the blue fluorescence are emitted from the light source unit 111. Further, as shown by the dotted line in FIG. 2, when the blue phosphor 111b is removed from the optical path of the purple LED light, the blue phosphor 111b is not excited and does not emit fluorescence. Therefore, only the purple LED light is emitted from the light source unit 111.
  • the second light source unit 112 includes a blue LED 112a that emits light in a blue wavelength band (for example, a wavelength of 420 to 480 nm), and a yellow phosphor 112b.
  • the yellow phosphor 112b is excited by the blue LED light emitted from the blue LED 112a, and emits fluorescence in a yellow wavelength band (for example, a wavelength is 420 to 700 nm).
  • the yellow phosphor 112b is attached on the light emitting surface of the blue LED 112a, and unlike the blue phosphor 111b, it cannot be inserted into and removed from the optical path of the blue LED light.
  • Collimating lenses 121 and 122 are arranged in front of the light source units 111 and 112 in the light emission direction, respectively.
  • the light emitted from the first light source unit 111 is converted into parallel light by the collimator lens 121 and is incident on the dichroic mirror 131.
  • the light emitted from the second light source unit 112 is converted into parallel light by the collimator lens 122 and is incident on the dichroic mirror 131.
  • the dichroic mirror 131 combines the optical path of the light emitted from the first light source unit 111 and the optical path of the light emitted from the second light source unit 112.
  • the dichroic mirror 131 has a cutoff wavelength in the vicinity of a wavelength of 520 nm, transmits light having a wavelength shorter than the cutoff wavelength, and reflects light having a wavelength longer than the cutoff wavelength. Yes. Therefore, the purple LED light and the blue fluorescence emitted from the first light source unit 111 are transmitted through the dichroic mirror 131. Further, the yellow fluorescence emitted from the second light source unit 112 is reflected by the dichroic mirror 131. Thereby, the optical path of the light emitted from the first light source unit 111 and the light emitted from the second light source unit 112 is combined. The light whose optical path is synthesized by the dichroic mirror 131 is emitted from the light source device 201 as the irradiation light L.
  • FIG. 3 is a block diagram conceptually showing only the light source units 111 and 112 and the dichroic mirror 131 in the light source device 201. Since the blue phosphor 111b is separate from the purple LED 111a, the blue phosphor 111b and the purple LED 111a are shown in separate blocks in FIG. On the other hand, since the yellow phosphor 112b is attached to the light emitting surface of the blue LED 112a and is integrally formed with the blue LED 112a, the yellow phosphor 112b and the blue LED 112a are shown as one block in FIG. Yes.
  • the dichroic mirror 131 synthesizes optical paths of light having different wavelengths. Therefore, in FIG. 3, the dichroic mirror 131 is indicated by an addition symbol “+”. In FIG. 3, the collimating lenses 121 and 122 arranged in front of the light source units 111 and 112 are omitted.
  • each arrow indicates an optical path of light.
  • the purple LED light emitted from the purple LED 111a of the first light source unit 111 and the blue fluorescence emitted from the blue phosphor 111b are emitted in the same optical path.
  • the blue LED light emitted from the blue LED of the second light source unit 112 and the yellow fluorescence emitted from the yellow phosphor are emitted in the same optical path.
  • the optical path of the light emitted from the first light source unit and the optical path of the light emitted from the second light source unit are combined by the dichroic mirror 131.
  • the light whose optical path is synthesized by the dichroic mirror 131 is emitted as the irradiation light L from the light source device 201.
  • the irradiation light L emitted from the light source device 201 is condensed on the incident end face of the LCB (Light Carrying Bundle) 11 by the condenser lens 25 and enters the LCB 11.
  • LCB Light Carrying Bundle
  • the irradiation light L incident on the LCB 11 propagates in the LCB 11.
  • the irradiation light L propagating through the LCB 11 is emitted from the emission end surface of the LCB 11 disposed at the tip of the electronic scope 100 and is irradiated onto the subject via the light distribution lens 12.
  • the return light from the subject irradiated with the irradiation light L from the light distribution lens 12 forms an optical image on the light receiving surface of the solid-state imaging device 14 via the objective lens 13.
  • the solid-state imaging device 14 is a single-plate color CCD (Charge Coupled Device) image sensor having a Bayer pixel arrangement.
  • the solid-state imaging device 14 accumulates an optical image formed by each pixel on the light receiving surface as a charge corresponding to the amount of light, and generates R (Red), G (Green), and B (Blue) image signals. Output.
  • the solid-state imaging device 14 is not limited to a CCD image sensor, and may be replaced with a CMOS (Complementary Metal Oxide Semiconductor) image sensor or other types of imaging devices.
  • the solid-state image sensor 14 may also be one having a complementary color filter mounted thereon.
  • a driver signal processing circuit 15 is provided in the connection part of the electronic scope 100.
  • An image signal of a subject irradiated with light from the light distribution lens 12 is input to the driver signal processing circuit 15 from the solid-state imaging device 14 at a frame period.
  • the frame period is, for example, 1/30 seconds.
  • the driver signal processing circuit 15 performs a predetermined process on the image signal input from the solid-state imaging device 14 and outputs the processed image signal to the upstream signal processing circuit 26 of the processor 200.
  • the driver signal processing circuit 15 also accesses the memory 16 and reads the unique information of the electronic scope 100.
  • the unique information of the electronic scope 100 recorded in the memory 16 includes, for example, the number and sensitivity of the solid-state imaging device 14, an operable frame rate, a model number, and the like.
  • the driver signal processing circuit 15 outputs the unique information read from the memory 16 to the system controller 21.
  • the system controller 21 performs various calculations based on the unique information of the electronic scope 100 and generates a control signal.
  • the system controller 21 uses the generated control signal to control the operation and timing of various circuits in the processor 200 so that processing suitable for the electronic scope 100 connected to the processor 200 is performed.
  • the timing controller 22 supplies clock pulses to the driver signal processing circuit 15 according to the timing control by the system controller 21.
  • the driver signal processing circuit 15 drives and controls the solid-state imaging device 14 at a timing synchronized with the frame rate of the video processed on the processor 200 side in accordance with the clock pulse supplied from the timing controller 22.
  • the image memory 27 buffers the image signal input from the upstream signal processing circuit 26 and outputs it to the downstream signal processing circuit 28 according to the timing control by the timing controller 22.
  • the post-stage signal processing circuit 28 processes the image signal input from the image memory 27 to generate screen data for monitor display, and converts the generated screen data for monitor display into a predetermined video format signal.
  • the converted video format signal is output to the monitor 300. Thereby, the image of the subject is displayed on the display screen of the monitor 300.
  • the electronic endoscope system 1 of the present embodiment has a plurality of observation modes including a normal observation mode and a special observation mode.
  • Each observation mode is switched manually or automatically depending on the subject to be observed. For example, when it is desired to observe the subject illuminated with normal light, the observation mode is switched to the normal observation mode.
  • the normal light is, for example, white light or pseudo white light.
  • White light has a flat spectral intensity distribution in the visible light band.
  • the pseudo-white light has a spectral intensity distribution that is not flat, and light in a plurality of wavelength bands is mixed.
  • special light is light with a high light absorbency with respect to a specific biological tissue, for example.
  • the biological tissue emphasized in the special observation mode is a surface blood vessel will be described.
  • FIG. 4 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 201 in each observation mode.
  • 4A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 4B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 4 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the first light source unit 111 and the second light source unit 112 are driven to emit light after the blue phosphor 111b is inserted in the optical path.
  • the spectral intensity distribution D111 of light emitted from the first light source unit 111 has intensity peaks at wavelengths of about 415 nm and about 470 nm.
  • a wavelength having the highest intensity among the specific wavelengths is referred to as a peak wavelength.
  • the wavelength having the highest intensity is called the peak wavelength.
  • These two wavelengths are the peak wavelength of the light emitted from the purple LED 111a and the peak wavelength of the spectral intensity distribution of the fluorescence emitted from the blue phosphor 111b.
  • the spectral intensity distribution D112 of light emitted from the second light source unit 112 has peaks at a wavelength of about 450 nm and a wavelength of about 600 nm. These two wavelengths are a peak wavelength of light emitted from the blue LED 112a and a peak wavelength of fluorescence emitted from the yellow phosphor 112b, respectively.
  • spectral intensity distribution D111 shown to Fig.4 (a) has substantially the same peak intensity of purple LED light and blue fluorescence
  • this invention is not limited to this.
  • the ratio of the intensity of the purple LED light emitted from the first light source unit 111 to the intensity of blue fluorescence can be freely changed by changing the type and amount of use of the blue phosphor 111b.
  • the spectral intensity distribution D112 shown in FIG. 4A has a larger ratio of the intensity of yellow fluorescence than that of the blue LED light, but the present invention is not limited to this.
  • the ratio between the blue LED light emitted from the second light source unit 112 and the yellow fluorescence can be freely changed by changing the type and amount of use of the yellow phosphor 112b.
  • the cutoff wavelength ⁇ 131 of the dichroic mirror 131 is indicated by a dotted line.
  • the dichroic mirror 131 has a cutoff wavelength ⁇ 131 of about 520 nm, transmits light in a wavelength band shorter than the cutoff wavelength ⁇ 131, and reflects light in a wavelength band longer than the cutoff wavelength ⁇ 131. Therefore, in the spectral intensity distribution D111 shown in FIG. 4A, light in the wavelength band indicated by the solid line passes through the dichroic mirror 131, and light in the wavelength band indicated by the broken line is reflected by the dichroic mirror 131. Also, in the spectral intensity distribution D112 shown in FIG.
  • light in a wavelength band equal to or greater than the cutoff wavelength ⁇ 131 indicated by the solid line is reflected by the dichroic mirror 131, and is shorter than the cutoff wavelength ⁇ 131 indicated by the short dotted line.
  • Light in the wavelength band passes through the dichroic mirror 131.
  • the optical paths of the light emitted from the light source units 111 and 112 are synthesized by the dichroic mirror 131, and the light source device 201 emits light having a wide wavelength band from the ultraviolet region (part of the near ultraviolet) to the red region.
  • Light L (normal light) is emitted.
  • the spectral intensity distribution of the irradiation light L (normal light) is the sum of the areas indicated by the solid lines in the spectral intensity distributions D111 and D112 shown in FIG.
  • the blue phosphor 111b is inserted into and removed from the optical path without using an optical filter that transmits only light in a specific wavelength band, so that the irradiation light L is changed between normal light and special light. Switching with. Therefore, it is possible to prevent light in a wavelength band that is not used for observing the subject by the optical filter from being cut and the light use efficiency of the first light source unit from being lowered.
  • the irradiation is performed unless the optical filter has ideal characteristics.
  • the light L is also mixed with blue fluorescence. Since the blue fluorescence is unnecessary light for obtaining a photographed image in which the superficial blood vessels are emphasized, the effect of superficial blood vessels is reduced by mixing the blue light with the irradiation light L. On the other hand, in this embodiment, since the blue fluorescence can be completely suppressed without using an optical filter, it is possible to prevent the enhancement effect of the surface blood vessels from being reduced.
  • the light paths of the light emitted from the light source units 111 and 112 are combined by the dichroic mirror 131. At this time, since the wavelength bands of the light emitted from the light source units 111 and 112 are different from each other, the loss of the light amount can be minimized when the optical paths in the dichroic mirror 131 are combined.
  • the special observation mode when using an optical filter that substantially transmits only light in a specific wavelength band as in the prior art, it is necessary to waste light other than the specific wavelength band.
  • the light utilization efficiency of the device is low.
  • the first embodiment of the present invention as shown in FIG. 4, light that is not used as irradiation light L by combining optical paths in the dichroic mirror 131 (light in a region indicated by a broken line in FIG. 4). Is smaller in amount of light than the light used as the irradiation light L (the light in the region indicated by the solid line in FIG. 4). Therefore, in the light source device 201 of the present embodiment, it is not necessary to wastefully emit light in a wavelength band that is not irradiated on the subject, and the light use efficiency can be increased as compared with the related art.
  • the distance from the distal end of the electronic scope 100 to the subject is long, so Strength is lowered.
  • the light source device 201 of the present embodiment does not use an optical filter in the special observation mode and has high light use efficiency, it is possible to increase the intensity of illumination light applied to the subject. Therefore, a bright captured image can be obtained even when observing a site such as the stomach.
  • an endoscope light source device according to a second embodiment of the present invention will be described.
  • the light source device according to the second embodiment is also used in the electronic endoscope system 1 in the same manner as the light source device 201 according to the first embodiment.
  • FIG. 5 is a block diagram conceptually showing only the light source unit and the dichroic mirror in the light source device 202 according to the second embodiment.
  • the light source device 202 includes a first light source unit 211, a second light source unit 212, and a first dichroic mirror 231.
  • the light source units 211 and 212 are individually controlled to emit light by a first light source drive circuit and a second light source drive circuit (not shown).
  • the first light source unit 211 has a purple LED 211a that emits light in a purple wavelength band (for example, a wavelength of 395 to 435 nm) and a blue phosphor 211b.
  • the blue phosphor 211b is excited by the purple LED light emitted from the purple LED 211a and emits fluorescence in a blue wavelength band (for example, a wavelength of 430 to 550 nm).
  • the blue phosphor 211b is supported by an unillustrated phosphor insertion / extraction mechanism so that the blue phosphor 211b can be inserted into and removed from the optical path of the purple LED light emitted from the purple LED 211a. Since the blue phosphor 211b is separate from the purple LED 211a, the blue phosphor 211b and the purple LED 211a are shown as separate blocks in FIG.
  • the second light source unit 212 includes a blue LED, a green phosphor, and a red phosphor that emit light in a blue wavelength band (for example, a wavelength of 420 to 480 nm).
  • the green phosphor is excited by blue LED light emitted from the blue LED, and emits fluorescence in a green wavelength band (for example, a wavelength of 510 to 630 nm).
  • the red phosphor is excited by the blue LED light emitted from the blue LED and emits fluorescence in the red wavelength band (for example, the wavelength is 550 to 750 nm).
  • the green phosphor and the red phosphor may be arranged side by side along the emission direction of blue LED light, or may be arranged side by side in a direction perpendicular to the emission direction of blue LED light.
  • the green phosphor and the red phosphor may be prepared as a single phosphor by mixing the materials.
  • a collimating lens (not shown) is arranged in front of the light source units 211 and 212 in the emission direction.
  • the light emitted from the first light source unit 211 is converted into parallel light by the collimator lens and is incident on the dichroic mirror 231.
  • the light emitted from the second light source unit 212 is converted into parallel light by the collimator lens and is incident on the dichroic mirror 231.
  • the dichroic mirror 231 combines the optical path of the light emitted from the first light source unit 211 and the optical path of the light emitted from the second light source unit 212.
  • the light whose optical path is synthesized by the dichroic mirror 231 is emitted from the light source device 202 as irradiation light L.
  • FIG. 6 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 202 in each observation mode.
  • 6A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 6B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 6 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the spectral intensity distribution D211 of light emitted from the first light source unit 211 has peaks at a wavelength of about 415 nm and a wavelength of about 470 nm. These two wavelengths are a peak wavelength of light emitted from the purple LED 211a and a peak wavelength of fluorescence emitted from the blue phosphor 211b, respectively.
  • the spectral intensity distribution D212 of light emitted from the second light source unit 212 has peaks at wavelengths of about 450 nm, about 550 nm, and about 650 nm. These three wavelengths are respectively the peak wavelengths of blue LED light, fluorescence emitted by the green phosphor, and fluorescence emitted by the red phosphor.
  • the cutoff wavelength ⁇ 231 of the dichroic mirror 231 is indicated by a dotted line.
  • the dichroic mirror 231 has a cutoff wavelength ⁇ 231 of about 510 nm, transmits light in a wavelength band shorter than the cutoff wavelength ⁇ 231, and reflects light in a wavelength band longer than the cutoff wavelength ⁇ 231. Therefore, in the spectral intensity distribution D211 shown in FIG. 4A, light in the wavelength band indicated by the solid line passes through the dichroic mirror 231 and light in the wavelength band indicated by the broken line is reflected by the dichroic mirror 231. Also, in the spectral intensity distribution D212 shown in FIG. 4A, light in the wavelength band indicated by the solid line is reflected by the dichroic mirror 231 and light in the wavelength band indicated by the broken line passes through the dichroic mirror 231.
  • the optical path of the light emitted from each of the light source units 211 and 212 is synthesized by the dichroic mirror 231, and the light source device 202 emits light having a wide wavelength band from the ultraviolet region (part of near ultraviolet) to the red region.
  • Light L normal light
  • the spectral intensity distribution of the irradiation light L (normal light) is the sum of the areas indicated by the solid lines in the spectral intensity distributions D211 and D212 shown in FIG.
  • both the first light source unit 211 and the second light source unit 212 are driven to emit light after the blue phosphor 211b is removed from the optical path. .
  • the ratio of light in the vicinity of the wavelength of 415 nm, which is the peak of the absorbance of hemoglobin, in the irradiation light L (special light) is relatively high, and a captured image in which the surface blood vessels are emphasized can be obtained.
  • the light source device according to the third embodiment is also used in the electronic endoscope system 1 in the same manner as the light source device 201 according to the first embodiment.
  • FIG. 8 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 203 in each observation mode.
  • 8A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 8B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 8 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the first to third light source units 311 to 313 are driven to emit light after the blue phosphor 311b is inserted in the optical path.
  • the spectral intensity distribution of the irradiation light L in the third embodiment is obtained by adding the spectral intensity distribution D313 of the red LED 313 to the irradiation light L in the first embodiment.
  • the light source device 203 of the third embodiment has a dichroic mirror 332 unlike the first embodiment, of the light emitted from the second light source unit 312, the light source device 203 of the dichroic mirror 332.
  • the optical path of light having a wavelength longer than the cutoff wavelength ⁇ 332 (630 nm) is not synthesized by the dichroic mirror 332 and is not emitted as the irradiation light L.
  • the optical path of light having a wavelength shorter than the cutoff wavelength ⁇ 332 is not synthesized by the dichroic mirror 332 and is not emitted as the irradiation light L.
  • the light source device 203 of the third embodiment has a red LED 313. Therefore, the spectral intensity distribution of the irradiation light L (normal light) in the case where the electronic endoscope system 1 is in the normal observation mode is closer to flat in the visible region than in the configuration without the red LED 313. Thereby, in the normal observation mode, the subject can be illuminated with the irradiation light L (normal light) close to natural white light.
  • the first phosphor unit 311 and the second light source unit 312 are driven to emit light after the blue phosphor 211b is removed from the optical path, and the third light source unit 312 is driven to emit light.
  • the light source unit 313 is not driven to emit light.
  • the light source device 203 of the third embodiment has three light source units 311 to 313 having different wavelength bands and capable of individually controlling light emission. Therefore, the spectral intensity distribution of the irradiation light L can be finely controlled by selecting a light source unit to be driven for light emission from among the three light source units 311 to 313 and individually controlling the drive current during the light emission drive.
  • an endoscope light source device according to a fourth embodiment of the present invention will be described.
  • the light source device according to the fourth embodiment is also used in the electronic endoscope system 1 in the same manner as the light source device 201 according to the first embodiment.
  • FIG. 9 is a block diagram conceptually showing only the light source unit and the dichroic mirror in the light source device 204 according to the fourth embodiment.
  • the light source device 204 includes a first light source unit 411, a second light source unit 412, a third light source unit 413, a first dichroic mirror 431, and a second dichroic mirror 432.
  • the light source units 411 to 413 are individually controlled to emit light by first to third light source driving circuits (not shown).
  • the light source device 204 according to the fourth embodiment is obtained by replacing the second light source unit 312 in the light source device 203 according to the third embodiment with an LED having no phosphor. .
  • the second light source unit 412 is a green LED that emits light in a green wavelength band (for example, a wavelength of 520 to 580 nm).
  • the characteristics of the first and third light source units 411 and 413 and the first and second dichroic mirrors 431 and 432 are the same as those of the first and third light source units 311 and 313 and the first and second light source units 311 and 313 of the third embodiment.
  • the characteristics of the second dichroic mirrors 331 and 332 need not be the same.
  • FIG. 10 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 204 in each observation mode.
  • 10A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 10B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 10 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the first to third light source units 311 to 313 are driven to emit light after the blue phosphor 411b is inserted in the optical path.
  • the spectral intensity distribution D411 of light emitted from the first light source unit 411 has peaks at a wavelength of about 415 nm and a wavelength of about 470 nm. These two wavelengths are a peak wavelength of light emitted from the purple LED 411a and a peak wavelength of fluorescence emitted from the blue phosphor 411b, respectively.
  • the spectral intensity distribution D412 of the light emitted from the second light source unit 412 has an intensity distribution with a peak wavelength of about 550 nm.
  • the spectral intensity distribution D413 of light emitted from the third light source unit 413 has an intensity distribution with a peak wavelength of about 640 nm.
  • the cutoff wavelengths ⁇ 431 and ⁇ 432 of the dichroic mirrors 431 and 432 are indicated by dotted lines. Cutoff wavelengths ⁇ 431 and ⁇ 432 are 510 nm and 590 nm, respectively. Any of the dichroic mirrors 431 and 432 transmits light in a wavelength band shorter than the cutoff wavelength and reflects light in a wavelength band equal to or greater than the cutoff wavelength.
  • the dichroic mirrors 431 and 432 the optical paths of the light emitted from the light source units 411 to 413 are combined and emitted as irradiation light L (normal light). By irradiating the subject with the irradiation light L (normal light), a normal color photographed image can be obtained.
  • the first light source unit 411 and the second light source unit 412 are driven to emit light after the blue phosphor 411b is removed from the optical path, and the third The light source unit 413 is not driven to emit light.
  • the ratio of light in the vicinity of the wavelength of 415 nm, which is the peak of the absorbance of hemoglobin, in the irradiation light L (special light) is relatively high, and a captured image in which the surface blood vessels are emphasized can be obtained.
  • an endoscope light source device according to a fifth embodiment of the present invention will be described.
  • the light source device according to the fifth embodiment is also used in the electronic endoscope system 1 in the same manner as the light source device 201 according to the first embodiment.
  • FIG. 11 is a block diagram conceptually showing only the light source unit and the dichroic mirror in the light source device 205 according to the fifth embodiment.
  • the light source device 205 includes a first light source unit 511, a second light source unit 512, and a first dichroic mirror 531.
  • the light source units 511 and 512 are individually controlled to emit light by first and second light source driving circuits (not shown).
  • the first light source unit 511 includes a phosphor LED 511a and a blue phosphor 511b.
  • the phosphor LED 511a has a purple LED that emits light in a purple wavelength band (for example, a wavelength of 395 to 435 nm), and a green phosphor attached on the light emitting surface of the purple LED.
  • the green phosphor is excited by the purple LED light emitted from the purple LED, and emits fluorescence in the green wavelength band (for example, the wavelength is 510 to 630 nm).
  • the blue phosphor 511b is excited by the violet LED light emitted from the violet LED, and emits fluorescence in a blue wavelength band (for example, the wavelength is 430 to 550 nm).
  • the blue phosphor 511b is supported by an unillustrated phosphor insertion / extraction mechanism so as to be insertable / removable with respect to the optical path of the light emitted from the phosphor LED 511a.
  • the second light source unit 512 is a red LED that emits light in a red wavelength band (for example, a wavelength of 620 to 680 nm).
  • the dichroic mirror 531 combines the optical path of the light emitted from the first light source unit 511 and the optical path of the light emitted from the second light source unit 512.
  • the light whose optical path is synthesized by the dichroic mirror 531 is emitted from the light source device 205 as irradiation light L.
  • FIG. 12 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 205 in each observation mode.
  • 12A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 12B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 12 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the first and second light source units 511 and 512 are driven to emit light after the blue phosphor 511b is inserted in the optical path.
  • the spectral intensity distribution D511 of light emitted from the first light source unit 511 has peaks at wavelengths of about 415 nm, about 470 nm, and about 550 nm. These three wavelengths are respectively the peak wavelengths of the purple LED light emitted from the purple LED, the fluorescence emitted from the blue phosphor 511b, and the fluorescence emitted from the green phosphor.
  • the spectral intensity distribution D512 of light emitted from the second light source unit 512 has an intensity distribution with a wavelength of about 650 nm as a peak wavelength.
  • the cutoff wavelength ⁇ 531 of the dichroic mirror 531 is indicated by a dotted line.
  • the cutoff wavelength ⁇ 531 is 620 nm.
  • the dichroic mirror 531 transmits light in a wavelength band shorter than the cutoff wavelength, and reflects light in a wavelength band equal to or greater than the cutoff wavelength.
  • the optical paths of the light emitted from the first light source unit 511 and the second light source unit 512 are combined and emitted as irradiation light L.
  • irradiation light L normal light
  • the blue phosphor 511b is removed from the optical path, and only the first light source unit 511 is driven to emit light, and the second light source unit 512 emits light. Not driven.
  • the ratio of light in the vicinity of the wavelength of 415 nm, which is the peak of the absorbance of hemoglobin, in the irradiation light L (special light) is relatively high, and a captured image in which the surface blood vessels are emphasized can be obtained.
  • the green phosphor of the first light source unit 511 is mounted on the light emitting surface of the purple LED, but the present invention is not limited to this.
  • the green phosphor of the first light source unit 511 may be disposed so as to be insertable / removable on the optical path of the light emitted from the purple LED.
  • the spectral intensity characteristic of the irradiation light L irradiated to the subject can be changed by inserting or removing the green phosphor on the optical path.
  • FIG. 13 is a block diagram conceptually showing only the light source unit and the dichroic mirror in the light source device 206 according to the sixth embodiment.
  • the light source device 206 includes a first light source unit 611, a second light source unit 612, and a first dichroic mirror 631.
  • the light source units 611 and 612 are individually controlled to emit light by first and second light source driving circuits (not shown).
  • the first light source unit 611 has a phosphor LED 611a and a red phosphor 611b.
  • the phosphor LED 611a includes a blue LED that emits light in a blue wavelength band (for example, a wavelength of 430 to 490 nm), and a green phosphor attached on the light emitting surface of the blue LED.
  • the green phosphor is excited by blue LED light emitted from the blue LED, and emits fluorescence in a green wavelength band (for example, a wavelength of 510 to 630 nm).
  • the red phosphor 611b is excited by the blue LED light emitted from the blue LED, and emits fluorescence in the red wavelength band (for example, the wavelength is 550 to 750 nm).
  • the red phosphor 611b is supported by an unillustrated phosphor insertion / extraction mechanism so as to be insertable / removable with respect to the optical path of light emitted from the phosphor LED 611a.
  • the second light source unit 612 is a purple LED that emits light in a purple wavelength band (for example, a wavelength of 395 to 435 nm).
  • the dichroic mirror 631 combines the optical path of the light emitted from the first light source unit 611 and the optical path of the light emitted from the second light source unit 612.
  • the light whose optical path is synthesized by the dichroic mirror 631 is emitted from the light source device 206 as irradiation light L.
  • FIG. 14 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 206 in each observation mode.
  • 14A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 14B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 14 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the first and second light source units 611 and 612 are driven to emit light after the red phosphor 611b is inserted in the optical path.
  • the spectral intensity distribution D611 of light emitted from the first light source unit 611 has peaks at wavelengths of about 460 nm, about 550 nm, and about 650 nm. These three wavelengths are the peaks of the spectral intensity distribution of the blue LED light emitted from the phosphor LED 611a, the green fluorescence, and the fluorescence emitted by the red phosphor 611b, respectively.
  • the spectral intensity distribution D612 of light emitted from the second light source unit 612 has an intensity distribution having a peak at about 415 nm.
  • the first and second light source units 611 and 612 are driven to emit light after the red phosphor 611b is removed from the optical path.
  • the ratio of light in the vicinity of the wavelength of 415 nm, which is the peak of the absorbance of hemoglobin, in the irradiation light L (special light) is relatively high, and a captured image in which the surface blood vessels are emphasized can be obtained.
  • an endoscope light source device according to a seventh embodiment of the present invention will be described.
  • the light source device according to the seventh embodiment is also used in the electronic endoscope system 1 in the same manner as the light source device 201 according to the first embodiment.
  • FIG. 15 is a block diagram conceptually showing only the light source unit in the light source device 207 according to the seventh embodiment.
  • the light source device 207 includes a light source unit 711.
  • the light source unit 711 is controlled to emit light by a light source driving circuit (not shown).
  • the light source unit 711 includes a phosphor LED 711a, a blue phosphor 711b, and a red phosphor 711c.
  • the phosphor LED 711a includes a purple LED that emits light in a purple wavelength band (for example, a wavelength of 395 to 435 nm) and a green phosphor that is attached on the light emitting surface of the purple LED. This green phosphor is excited by the purple LED light emitted from the purple LED, and emits fluorescence in the green wavelength band (for example, the wavelength is 510 to 630 nm).
  • the blue phosphor 711b is excited by the purple LED light emitted from the purple LED, and emits fluorescence in a blue wavelength band (for example, a wavelength of 430 to 550 nm).
  • the red phosphor 711c is excited by the purple LED light emitted from the purple LED, and emits fluorescence in the red wavelength band (for example, the wavelength is 550 to 750 nm).
  • the blue phosphor 711b and the red phosphor 711c are individually inserted into or removed from the optical path of light emitted from the phosphor LED 711a by a phosphor insertion / extraction mechanism (not shown).
  • FIG. 16 shows the spectral intensity distribution of the irradiation light L emitted from the light source device 207 in each observation mode.
  • 16A shows the spectral intensity distribution of the irradiation light L (normal light) in the normal observation mode
  • FIG. 16B shows the spectral intensity distribution of the irradiation light L (special light) in the special observation mode.
  • the horizontal axis of the spectral intensity distribution shown in FIG. 16 indicates the wavelength (nm), and the vertical axis indicates the intensity of the irradiation light L. Note that the vertical axis is standardized so that the maximum intensity value is 1.
  • the light source unit 711 is driven to emit light after the blue phosphor 711b and the red phosphor 711c are inserted in the optical path.
  • the light source unit 711 is driven to emit light after the blue phosphor 711b and the red phosphor 711c are removed from the optical path.
  • the ratio of light in the vicinity of the wavelength of 415 nm, which is the peak of the absorbance of hemoglobin, in the irradiation light L (special light) is relatively high, and a captured image in which the surface blood vessels are emphasized can be obtained.
  • the configuration of the light source device 207 can be simplified.
  • the light source unit 711 has three phosphors of red, blue, and green.
  • the phosphor has a wider wavelength band than the light emitted from the LED. Therefore, the spectral intensity distribution of the irradiation light L (normal light) when the electronic endoscope system 1 is in the normal observation mode is more visible than when the light source unit 711 has one or two phosphors. It approaches flat in the area. Accordingly, the subject can be illuminated with the irradiation light L (normal light) close to natural white light.
  • Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention.
  • the embodiment of the present invention also includes contents appropriately combined with embodiments or the like clearly shown in the specification or obvious embodiments.
  • an LED is assumed as the solid state light emitting device.
  • the present invention is not limited to this, and it is also possible to employ LD (Laser Diode) as a solid state light emitting device.

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Abstract

L'invention concerne un dispositif de source de lumière destiné à un endoscope composé : d'une première unité de source de lumière comportant un premier élément électroluminescent à semi-conducteurs qui projette de la lumière dans une première bande de longueur d'onde et un premier corps fluorescent qui est excité par la lumière dans la première bande de longueur d'onde et émet une première lumière fluorescente; et d'un moyen d'insertion/de retrait de corps fluorescent soutenant le premier corps fluorescent de sorte que le premier corps fluorescent peut être inséré et retiré par rapport au trajet de lumière de la lumière projetée par le premier élément électroluminescent à semi-conducteurs. Lorsque le premier corps fluorescent est introduit dans le trajet de lumière par le moyen d'insertion/de retrait de corps fluorescent, la lumière dans la première bande de longueur d'onde et la première lumière fluorescente sont fournies à l'endoscope, projetées sur le même trajet de lumière. De plus, lorsque le premier corps fluorescent est retiré du trajet de lumière, la lumière dans la première bande de longueur d'onde est projetée et fournie à l'endoscope.
PCT/JP2016/054811 2016-02-19 2016-02-19 Dispositif de source de lumière destiné à un endoscope Ceased WO2017141416A1 (fr)

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PCT/JP2016/054811 WO2017141416A1 (fr) 2016-02-19 2016-02-19 Dispositif de source de lumière destiné à un endoscope
CN201790000597.7U CN209091323U (zh) 2016-02-19 2017-02-20 内窥镜用光源装置及内窥镜系统
PCT/JP2017/006123 WO2017142096A1 (fr) 2016-02-19 2017-02-20 Dispositif de source de lumière destiné à un endoscope et système endoscopique
JP2018500243A JP6695416B2 (ja) 2016-02-19 2017-02-20 内視鏡用光源装置及び内視鏡システム

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CN110799086B (zh) * 2017-08-28 2023-05-12 Hoya株式会社 内窥镜用光源装置及内窥镜系统

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