CN209091323U

CN209091323U - Light source device for endoscope and endoscopic system

Info

Publication number: CN209091323U
Application number: CN201790000597.7U
Authority: CN
Inventors: 尾登邦彦; 横内文香
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2016-02-19
Filing date: 2017-02-20
Publication date: 2019-07-12
Anticipated expiration: 2027-02-20
Also published as: WO2017141416A1; WO2017142096A1; JP6695416B2; JPWO2017142096A1

Abstract

Light source device for endoscope includes: first light source unit, has the first solid-state light emitting element of the light for projecting first band and is excited and issued by the light of first band the first fluorophor of the first fluorescence；And fluorophor push-pull structure, by the first fluorophor support as can relative to the light projected from the first solid-state light emitting element optical path into and out.When the first fluorophor is inserted into optical path by fluorophor push-pull structure, the light of first band and the first fluorescence are projected with same optical path and are supplied to endoscope.In addition, the light emission of first band goes out and is supplied to endoscope when extracting the first fluorophor from optical path.

Description

Light source device for endoscope and endoscopic system

Technical field

The utility model relates to the light source device for endoscope and endoscopic system to subject irradiation light.

Background technique

It is known to the endoscopic system for changing the spectrophotometric intensity characteristic of irradiation light and shooting particular image.Such as in the world It discloses No. 2012/108420 handbook and (is denoted as " patent document 1 " below.) in, it records and is used in this endoscopic system Light supply apparatus specific structure.

The endoscopic system recorded in patent document 1 includes that there are two light emitting diode (LED:Light for carrying Emitting Diode) and optical filter light supply apparatus.One in two LED is the purple for projecting the light of purple wave band LED.In addition, another LED is the fluorophor LED with blue led and yellow fluorophor, by by blue LED light and yellow Fluorescence mixing, to project pseudo- white light.Optical filter is the wave band for only making to have high absorbance to specified bio-tissue The wavelength selective filters that light passes through are inserted into extracting from the optical path of the fluorophor LED light projected and from the optical path.

In the light supply apparatus documented by patent document 1, when extracting optical filter from optical path, from fluorophor The light that LED is projected is in the case where wave band is unrestricted, as in white light to subject.On the other hand, it is filtered when by optics When wave device is inserted into optical path, is projected from fluorophor LED and limit the irradiation light of wave band and the irradiation light from purple LED injection Both it is irradiated in subject.In this way, by the spectrophotometric intensity characteristic of change irradiation light and only by the light irradiation of designated band Onto subject, the shooting image for emphasizing the specified tissue in organism in subject can be obtained.

In the light supply apparatus documented by patent document 1, only there is high-intensitive irradiation light in designated band in order to obtain, By the wave band for the irradiation light that optical filter limitation is projected from White LED, and cut off the light of unwanted wave band.Due to quilt The light of cutting is not irradiated in subject, therefore there is a problem of that the light utilization ratio of light supply apparatus is low.

Utility model content

The utility model is to complete in view of the foregoing, and its purpose is to provide can be shone with high light utilization ratio Penetrate the light source device for endoscope and endoscopic system only in designated band with high-intensitive irradiation light.

The light source device for endoscope that one embodiment of the utility model is related to includes: first light source unit, has and penetrates The first solid-state light emitting element of the light of first band and excited and issued by the light of first band the first fluorescence of the first fluorescence out Body；And fluorophor push-pull structure, the first fluorophor is supported as can be relative to the light projected from the first solid-state light emitting element Optical path into and out.In this configuration, when the first fluorophor is inserted into from the first solid luminescence by fluorophor push-pull structure When the optical path for the light that element projects, the light of first band and the first fluorescence are projected and are supplied from first light source unit with same optical path To endoscope.In addition, when by fluorophor push-pull structure by the first fluorophor light emitted by the first solid-state light emitting element When extracting in optical path, the light of first band projects from first light source unit and is supplied to endoscope.

According to this structure, by by fluorophor insertion from the optical path for the light that solid-state light emitting element projects, can will be In visible light region there is broadband normal light to be irradiated in subject.In addition, by extracting fluorophor from optical path, energy The enough special illumination that the intensity of the light of the high wave band of the absorbance of the specified bio-tissue to subject is higher than its all band It is mapped in subject.In addition, not needing in the switching of spectrophotometric intensity characteristic for being irradiated light using wavelength restriction filter Equal optical filters, therefore it is able to suppress the light loss with switching spectrophotometric intensity characteristic.

In addition, light source device for endoscope is for example in an embodiment of the utility model further include: second light source list Member projects the light with the wave band of the peak wavelength different from the peak wavelength of the wave band of the first fluorescence；And first optical path close At mechanism, the optical path of the light projected from first light source unit and the optical path of the light projected from second light source unit are synthesized, and will be closed Endoscope is supplied at the light after optical path.

In addition, in an embodiment of the utility model, second light source unit for example with the second solid-state light emitting element, With excited by the light projected from the second solid-state light emitting element and issue the second fluorophor of the second fluorescence.In this configuration, second The peak wavelength of the wave band of fluorescence is different from the peak wavelength of the peak wavelength of first band and the wave band of the first fluorescence.

In addition, light source device for endoscope is for example in an embodiment of the utility model further include: third light source list Member, projects the light of third wave band, which has with the peak wavelength of light projected from first light source unit and from second The different peak wavelength of the peak wavelength for the light that light source unit projects；With the second optical path combination mechanism, synthesis is closed by the first optical path At mechanism synthesis light optical path and from third light source unit project light optical path, and by synthesize optical path after light be supplied in Sight glass.

In addition, first light source unit for example also includes third fluorophor, quilt in an embodiment of the utility model The light excitation of the first band projected from the first solid-state light emitting element, issuing has the peak different from the peak wavelength of the first fluorescence It is worth the third fluorescence of wavelength.In this case, when the first fluorophor is inserted into from the first solid by fluorophor push-pull structure When the optical path for the light that light-emitting component projects, the light of first band, the first fluorescence, third fluorescence are with same optical path from first light source list Member projects and is supplied to endoscope.In addition, when by fluorophor push-pull structure by the first fluorophor from the first solid-state light emitting element When extracting in the optical path of emitted light, first band and third fluorescence are projected and are supplied from first light source unit with same optical path To endoscope.

In addition, first light source unit is for example in an embodiment of the utility model further include: the 4th fluorophor, quilt The light excitation of the first band projected from the first solid-state light emitting element, issues with glimmering with the peak wavelength and third of the first fluorescence 4th fluorescence of the different peak wavelength of the peak wavelength of light.In this case, fluorophor push-pull structure is by the first fluorophor And the 4th fluorophor support can be individually inserted into and extract relative to the optical path of the light projected from the first solid-state light emitting element.

In addition, the light source device for endoscope that one embodiment of the utility model is related to also is configured to further include: turn Platform is synchronously rotated with defined imaging cycle.In this case, it on turntable, is circumferentially arranged in parallel with and is respectively provided with The fluorophor of the different characteristics of luminescences.When each fluorophor is sequentially inserted into the optical path of irradiation light by turntable rotation, the photograph Penetrating fairing time becomes light corresponding with the fluorophor being inserted into the optical path and is supplied to endoscope.

In addition, the endoscopic system that one embodiment of the utility model is related to includes above-mentioned light source device for endoscope and interior Sight glass.

According to one embodiment of the utility model, providing to irradiate with high light utilization ratio only has in designated band The light source device for endoscope and endoscopic system of high-intensitive irradiation light.

Detailed description of the invention

Fig. 1 is the block diagram for showing the structure for the electronic endoscope system that the utility model first embodiment is related to.

Fig. 2 is the block diagram for the light source device for endoscope that the utility model first embodiment is related to.

Fig. 3 is the block diagram for the light source device for endoscope that the utility model first embodiment is related to.

Fig. 4 is the irradiation light for showing the light source device for endoscope being related to from the utility model first embodiment and projecting The figure of spectrophotometric intensity distribution.

Fig. 5 is the block diagram for the light source device for endoscope that the utility model second embodiment is related to.

Fig. 6 is the irradiation light for showing the light source device for endoscope being related to from the utility model second embodiment and projecting The figure of spectrophotometric intensity distribution.

Fig. 7 is the block diagram for the light source device for endoscope that the utility model third embodiment is related to.

Fig. 8 is the irradiation light for showing the light source device for endoscope being related to from the utility model third embodiment and projecting The figure of spectrophotometric intensity distribution.

Fig. 9 is the block diagram for the light source device for endoscope that the 4th embodiment of the utility model is related to.

Figure 10 is the irradiation light for showing the light source device for endoscope being related to from the 4th embodiment of the utility model and projecting Spectrophotometric intensity distribution figure.

Figure 11 is the block diagram for the light source device for endoscope that the 5th embodiment of the utility model is related to.

Figure 12 is the irradiation light for showing the light source device for endoscope being related to from the 5th embodiment of the utility model and projecting Spectrophotometric intensity distribution figure.

Figure 13 is the block diagram for the light source device for endoscope that the utility model sixth embodiment is related to.

Figure 14 is the irradiation light for showing the light source device for endoscope being related to from the utility model sixth embodiment and projecting Spectrophotometric intensity distribution figure.

Figure 15 is the block diagram for the light source device for endoscope that the 7th embodiment of the utility model is related to.

Figure 16 is the irradiation light for showing the light source device for endoscope being related to from the 7th embodiment of the utility model and projecting Spectrophotometric intensity distribution figure.

Figure 17 is to show the light source device for endoscope being related to from the variation of the 4th embodiment of the utility model to project Irradiation light spectrophotometric intensity distribution figure.

Figure 18 is the block diagram for the light source device for endoscope that another embodiment of the utility model is related to.

Figure 19 is the block diagram for the light source device for endoscope that another embodiment of the utility model is related to.

Figure 20 be show it is rotary included by the light source device for endoscope that another embodiment of the utility model is related to The figure of the structure of turntable.

Figure 21 is the absorption spectrum for the hemoglobin that will amplify near 550nm.

Specific embodiment

Hereinafter, side reference attached drawing, while illustrating the embodiments of the present invention.In addition, hereinafter, as the utility model Electronic endoscope system including light source device for endoscope is illustrated by one embodiment as example.

(first embodiment)

Fig. 1 is shown in the electronics including light source device for endoscope 201 that the utility model first embodiment is related to The block diagram of the structure of endoscope system 1.As shown in Figure 1, the system that electronic endoscope system 1 is used exclusively for medical treatment, and including electricity Sub- mirror 100, processor 200 and monitor 300.

Processor 200 includes system controller 21 and timing controller 22.System controller 21 executes memory 23 and is deposited The various programs of storage, and it is uniformly controlled entire electronic endoscope system 1.In addition, system controller 21 is connect with operation panel 24. System controller 21 changes the various of electronic endoscope system 1 according to the instruction for being input to operation panel 24 from surgical staff Operation and for various operations parameter.The input instruction of surgical staff for example has the observing pattern of electronic endoscope system 1 Switching instruction.Observing pattern has common observing pattern and special observing pattern.The details about each observing pattern is described below.It is fixed When controller 22 clock pulses for the timing for adjusting the operation of each section is output to each circuit in electronic endoscope system 1.

Processor 200 includes light supply apparatus 201.Fig. 2 shows the light supply apparatus that the utility model first embodiment is related to 201 block diagram.Light supply apparatus 201 includes first light source unit 111 and second light source unit 112.First light source unit 111, Two light source units 112 individually carry out light emitting control by first light source driving circuit 141, second light source driving circuit 142 respectively.

In the present embodiment, light supply apparatus 201 is included in processor 200, but in other embodiments, light source Device 201 is also possible to the device separated with processor 200 (more precisely, the part to constitute image processing apparatus).

First light source unit 111 has the violet light for the light for projecting purple wave band (for example, wavelength is 395~435nm) Diode (LED:Light Emitting Diode) 111a and blue emitting phophor 111b.Blue emitting phophor 111b is by from purple The purple LED light excitation that LED111a is projected, issues the fluorescence of blue wave band (for example, wavelength is 430~550nm).

Blue emitting phophor 111b by fluorophor push-pull structure 151 support for can be carried out in optical path into and out.In detail For, mode according to the observation, by blue emitting phophor 111b insertion from the optical path of the purple LED111a purple LED light projected or from It is extracted in the optical path.As solid line in figure 2, in situation about being inserted into blue emitting phophor 111b in the optical path of purple LED light Under, blue emitting phophor 111b issues the fluorescence of blue.The fluorescence of purple LED light and blue is projected from light source unit 111 as a result, The two.In addition, as shown in dashed line in figure 2, in the feelings for extracting blue emitting phophor 111b from the optical path of purple LED light Under condition, blue emitting phophor 111b is not excited, and does not issue fluorescence.Therefore, purple LED light is only projected from light source unit 111.

Second light source unit 112 has the blue for the light for projecting blue wave band (for example, wavelength is 420~480nm) LED112a and yellow fluorophor 112b.The blue LED light excitation that yellow fluorophor 112b is projected from blue led 112a, issues The fluorescence of yellow band (for example, wavelength is 420~700 nm).Yellow fluorophor 112b is mounted on shining for blue led 112a On face, and different from blue emitting phophor 111b, cannot in the optical path of blue LED light into and out.

In the front in the injection direction of the light of each light source unit 111,112, it is each configured with collimation lens 121,122.From The light that first light source unit 111 projects is converted to directional light by collimation lens 121, and is incident on dichronic mirror 131.In addition, from The light that second light source unit 112 projects is converted to directional light by collimation lens 122, and is incident on dichronic mirror 131.Dichronic mirror The optical path for the light that 131 synthesis are projected from first light source unit 111 and the optical path of the light projected from second light source unit 112.In detail For, dichronic mirror 131 has cutoff wavelength near wavelength 520nm, and having keeps the light than the wavelength of cut-off wave length saturating Cross the characteristic of the light of the wavelength of simultaneously reflective stopping wavelength or more.Therefore, purple LED light, the indigo plant projected from first light source unit 111 Color fluorescence penetrates dichronic mirror 131.In addition, being reflected from the yellow fluorescence that second light source unit 112 projects by dichronic mirror 131.As a result, Synthesize the optical path of the light projected from first light source unit 111 and the light projected from second light source unit 112.Pass through dichronic mirror 131 The light for synthesizing optical path is projected as irradiation light L from light supply apparatus 201.

Fig. 3 is the block diagram for conceptually only showing each light source unit 111,112 and dichronic mirror 131 in light supply apparatus 201. Blue emitting phophor 111b and purple LED111a is separated, therefore in Fig. 3, and blue emitting phophor 111b and purple LED111a are different Frame show.On the other hand, yellow fluorophor 112b is installed on the light-emitting surface of blue led 112a, and with blue led 112a structure It is integrally formed, therefore in Fig. 3, yellow fluorophor 112b and blue led 112a are shown with a frame.

In addition, the optical path of the different light of 131 synthetic wavelength of dichronic mirror.Therefore, in Fig. 3, dichronic mirror 131 uses add character "+" indicates.In addition, the collimation lens 121,122 for being configured at the front of each light source unit 111,112 is omitted in Fig. 3.

In Fig. 3, each arrow indicates the optical path of light.In the example depicted in fig. 3, from the purple of first light source unit 111 The blue-fluorescence that the purple LED light and blue emitting phophor 111b that LED111a is projected issue is projected with same optical path.In addition, from The yellow fluorescence that the blue LED light and yellow fluorophor that the blue led of two light source units 112 projects issue is penetrated with same optical path Out.The optical routing dichronic mirror 131 of the optical path of the light projected from first light source unit and the light projected from second light source unit synthesizes. It is projected as irradiation light L from light supply apparatus 201 by the light that dichronic mirror 131 synthesizes optical path.

As shown in Figure 1, the irradiation light L projected from light supply apparatus 201 is condensed to LCB (Light by collector lens 25 Carrying Bundle: light carrier bundle) 11 incident end face and be incident in LCB11.

The irradiation light L being incident in LCB11 is propagated in LCB11.The irradiation light L propagated in LCB11 is from being configured at electricity The injection end face of the LCB11 of the front end of sub- mirror 100 is projected, and is irradiated in subject via light-distribution lens 12.From subject Return light forms optical image on the light-receiving surface of solid-state imaging element 14 via object lens 13, and the subject is by coming from light-distribution lens 12 Irradiation light L irradiation.

Solid-state imaging element 14 is one-board colored CCD (the Charge Coupled with bayer-like pixel configuration Device；Charge coupled cell) imaging sensor.The optical image that solid-state imaging element 14 will be formed by each pixel on light-receiving surface Accumulation generates R (red), G (green), the picture signal of B (blue) and output as charge corresponding with light quantity.It needs to infuse Meaning, solid-state imaging element 14 are not limited to ccd image sensor, also could alternatively be CMOS (Complementary Metal Oxide Semiconductor: complementary metal oxide semiconductor) imaging sensor or other kinds of imaging dress It sets.In addition, solid-state imaging element 14 can also carry complementary color filter.

It include driver signal processing circuit 15 in the interconnecting piece of electron mirror 100.By the illumination from light-distribution lens 12 The picture signal for the subject penetrated is input to driver signal processing circuit 15 from solid-state imaging element 14 with the frame period.The frame period For example, 1/30 second.Driver signal processing circuit 15 is to carry out the processing of the electron mirror 100 that is suitably connected to processor 200 Mode, the operation and timing of the various circuits in control processor 200.

Driver signal processing circuit 15 also accesses memory 16 and reads the intrinsic information of electron mirror 100.It is recorded in and deposits The intrinsic information of electron mirror 100 in reservoir 16 is for example including the pixel number of solid-state imaging element 14, sensitivity, operable Frame rate, model etc..The intrinsic information read from memory 16 is output to system controller by driver signal processing circuit 15 21。

System controller 21 carries out various operations based on the intrinsic information of electron mirror 100, generates control signal.System control Device 21 uses the control signal generated, the operation and timing of the various circuits in control processor 200, to be suitably connected to The processing of the electron mirror 100 of processor 200.

Timing controller 22 according to system controller 21 timing controlled, to 15 suppling clock of driver signal processing circuit Pulse.Driver signal processing circuit 15 is handled according to the clock pulses supplied from timing controller 22 with 200 side of processor The frame rate synchronous timing of image drive control is carried out to solid-state imaging element 14.

Prime signal processing circuit 26 is to the picture signal inputted with the period of a frame from driver signal processing circuit 15 Implement signal processing as defined in demosaicing processing, matrix operation, Y/C separation etc., and is output to video memory 27.

Video memory 27 caches the picture signal inputted from prime signal processing circuit 26, and according to timing controller 22 timing controlled is output to rear class signal processing circuit 28.

Rear class signal processing circuit 28 handles the picture signal inputted from video memory 27 and generates monitor The picture data of display, and the picture data that the monitor after generation is shown is converted into defined video format signal. Video format signal after conversion is output to monitor 300.Subject is shown on the display screen of monitor 300 as a result, Image.

The electronic endoscope system 1 of present embodiment has multiple sights including common observing pattern and special observing pattern Examine mode.According to the subject to be observed, manually or automatically switch each observing pattern.For example, when desired normal light is to quilt When taking the photograph body and being illuminated and observed, observing pattern is switched to common observing pattern.In addition, normal light be, for example, white light or Pseudo- white light.White light in visible light wave range there is flat spectrophotometric intensity to be distributed.In pseudo- white light, spectrophotometric intensity distribution is uneven, And the light of multiple wave bands is mixed.In addition, for example, when wanting to be emphasized by illuminating subject with special light When the shooting image of specified bio-tissue, observing pattern is switched to special observing pattern.

It in addition, special light is, for example, the narrow-band light in specified wavelength with sharp peak value, and is for specified The high light of bio-tissue absorbance.About the light of specified wavelength, such as can enumerate high for superficial blood vessel absorbance 415nm nearby the light of (such as 415 ± 5nm), (such as 550 near the 550nm high for the middle layer blood vessel absorbance than surface layer depth ± 5nm) light, near the 650nm high for the deep-level blood vessel absorbance than middle layer depth (such as 650 ± 5nm) light.In addition, The longer light of wavelength, the depth for reaching bio-tissue are deeper.Therefore, by near 415nm, near 550nm, near 650nm The sequence of narrow-band light, as deep as layer domain deepen.Hereinafter, being to the bio-tissue emphasized under special observing pattern mainly The case where superficial blood vessel, is illustrated.

Blood containing hemoglobin flows in superficial blood vessel.Known hemoglobin near wavelength 415nm and 550nm nearby has the peak value of absorbance.Therefore, by being suitable for emphasizing that the special light of superficial blood vessel is (specific to subject irradiation For, compared with its all band, become the high-intensitive light near the wavelength 415nm of the peak value of the absorbance of hemoglobin), energy It is enough to obtain the shooting image for emphasizing superficial blood vessel.High-intensitive special light near wavelength 550nm also has superficial blood vessel Higher absorbance.In other words, the high-intensitive special light near wavelength 550nm also contributes to being highlighted for superficial blood vessel. Therefore, the wavelength 550nm by the light near illumination wavelength 415nm and another peak value of the absorbance as hemoglobin is attached Close high-intensitive special light, is able to maintain that the state for emphasizing superficial blood vessel, while the brightness for shooting image being made to brighten.

That is, under special observing pattern, by using in specified wavelength with the narrow-band light (special light) of peak value, Be able to carry out be suitable for it is clear be held in the blood vessel that is difficult to observe under common observing pattern (each layer region such as surface layer, middle layer, deep layer Blood vessel) travel condition narrow-band observation.By carrying out narrow-band observation, the early detection to lesions such as cancers can be obtained Useful information.

Fig. 4 shows the spectrophotometric intensity distribution of the irradiation light L projected in each observing pattern from light supply apparatus 201.Fig. 4's (a) spectrophotometric intensity distribution of the irradiation light L (normal light) in common observing pattern is shown, it is (special that (b) of Fig. 4 shows irradiation light L Light) in special observing pattern spectrophotometric intensity distribution.The horizontal axis of spectrophotometric intensity distribution shown in Fig. 4 indicates wavelength (nm), indulges The intensity of axis expression irradiation light L.In addition, the longitudinal axis is normalized in such a way that the maximum value of intensity is 1.

When electronic endoscope system 1 is in common observing pattern, blue emitting phophor 111b is being inserted into optical path it Afterwards, the driving that shines is carried out to first light source unit 111 and second light source unit 112.

The spectrophotometric intensity distribution D111 of the light projected from first light source unit 111 is about 415 nm in wavelength and wavelength is about There is intensity peak at 470nm.It should be noted that in this application, the highest wavelength of intensity in the specified wavelength is known as Peak wavelength.For example, the wavelength wherein with maximum intensity is known as peak value wave when there are two or more intensity peaks It is long.The two wavelength are the fluorescence issued from the peak wavelength and blue emitting phophor 111b of the purple LED111a light projected respectively Spectrophotometric intensity distribution peak wavelength.

The spectrophotometric intensity distribution D112 of the light projected from second light source unit 112 is about 450 nm in wavelength and wavelength is about There is peak value at 600nm.The two wavelength are the peak wavelength and yellow fluorophor from the blue led 112a light projected respectively The peak wavelength for the fluorescence that 112b is issued.

In addition, in the distribution of the spectrophotometric intensity shown in (a) of Fig. 4 D111, the peak strength of purple LED light and blue-fluorescence It is roughly the same, but it's not limited to that for the utility model.The purple LED light and blue-fluorescence projected from first light source unit 111 The ratio of intensity can freely be changed by the type and usage amount for changing blue emitting phophor 111b.In addition, Fig. 4's (a) spectrophotometric intensity shown in is distributed in D112, and compared with blue LED light, the ratio of the intensity of yellow fluorescence is bigger, but this is practical It is novel that it's not limited to that.The ratio of the blue LED light and yellow fluorescence that project from second light source unit 112 can pass through change The type and usage amount of yellow fluorophor 112b freely changes.

In addition, the maximum value of the intensity of the distribution of spectrophotometric intensity shown in (a) of Fig. 4 D111, D112 is unanimously 1, but this reality It's not limited to that with novel.From each light source unit 111,112 project light intensity than can according to than from subject, Screening-mode, surgical staff habit arbitrarily set.

In addition, being shown in broken lines the cutoff wavelength λ 131 of dichronic mirror 131 in (a) of Fig. 4.Dichronic mirror 131 has about The cutoff wavelength λ 131 of 520nm penetrates the light of the wave band shorter than cutoff wavelength λ 131, and 131 or more reflective stopping wavelength X The light of wave band.Therefore, in the distribution of the spectrophotometric intensity shown in (a) of Fig. 4 D111, the light of wave band shown in solid penetrates color separation The light of mirror 131, wave band shown in dotted line is reflected by dichronic mirror 131.In addition, the spectrophotometric intensity shown in (a) of Fig. 4 is distributed D112 In, the light of the wave band of 131 or more cutoff wavelength λ shown in solid is reflected by dichronic mirror 131, than cutoff wavelength λ shown in dotted line The light of 131 short wave bands penetrates dichronic mirror 131.

The optical path of the light projected from each light source unit 111,112 is synthesized by dichronic mirror 131 as a result, and from light supply apparatus 201 project from ultraviolet region (a part of near ultraviolet) to red area with broadband irradiation light L (normal light).The irradiation The spectrophotometric intensity distribution of light L (normal light) is that spectrophotometric intensity shown in Fig. 4 (a) is distributed to area shown in solid in D111, D112 Domain, which merges, to be obtained.By the way that irradiation light L (normal light) to be irradiated in subject, common color camera image can be obtained.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 111b from optical path After extraction, the driving that shines is carried out to first light source unit 111 and second light source unit 112.Irradiation light L (special light) as a result, In become hemoglobin absorbance peak value wavelength 415nm near the ratio of light relatively heighten and (become narrow-band Light), the shooting image for emphasizing superficial blood vessel can be obtained.In addition, the light projected from second light source unit 112 includes to become blood red Light near the wavelength 550nm of another peak value of the absorbance of albumen.Therefore, by first light source unit 111 and second Light source unit 112 carries out the driving that shines, and is able to maintain that the state for emphasizing superficial blood vessel, while improving the brightness of shooting image.

In addition, in the present embodiment, by optical path into and out blue emitting phophor 111b without the use of only making The optical filter that the light of designated band penetrates, irradiation light L can be switched between normal light and special light.Therefore, It can prevent the light for the wave band for being not used for observation subject from being dropped by the light utilization ratio of optical filter cutting, first light source unit It is low.

Further, it is assumed that in the purple LED light projected using optical filter since first light source unit and blue fluorescence In the case where middle extraction purple LED light, as long as optical filter does not have ideal characteristic, blue will be mixed in irradiation light L Fluorescence.The fluorescence of blue is to obtain the unwanted light of shooting image institute for emphasizing superficial blood vessel, therefore mix in irradiation light L The emphasis effect of the fluorescence of blue, superficial blood vessel reduces.In contrast, in the present embodiment, it can be filtered without using optics The fluorescence of blue is completely inhibited in the case where wave device, therefore can prevent the emphasis effect of superficial blood vessel from reducing.

In addition, the light projected from each light source unit 111,112 synthesizes its optical path by dichronic mirror 131.At this point, from each light source The wave band for the light that unit 111,112 projects is different, therefore when synthesizing optical path by dichronic mirror 131, can be by the damage of light quantity It loses and inhibits in minimum limit.

For example, as prior art, substantially only penetrating the light of designated band using in special observing pattern Optical filter in the case where, need invalidly to issue the light other than designated band, the light utilization ratio of light supply apparatus is low.With This is opposite, in the first embodiment of the utility model, as shown in figure 4, being synthesized by the optical path in dichronic mirror 131 unused Make the light (light in region shown in dotted line in Fig. 4) of irradiation light L and the light light of region (in Fig. 4 shown in solid) as irradiation light L It compares, light quantity is small.Therefore, it in the light supply apparatus of present embodiment 201, does not need invalidly to issue and is not irradiated to subject On wave band light, and can be improved light utilization ratio compared with prior art.

In addition, when observation has position (such as the stomach) in wider space, the typically front end from electron mirror 100 Distance to subject (such as stomach wall) is remote, therefore the intensity for the irradiation light being irradiated in subject is lower.It is bright in order to obtain Shooting image, need to illuminate subject with high-intensitive irradiation light.The light supply apparatus 201 of present embodiment is special Without using optical filter and with high light utilization ratio in observing pattern, therefore it can be improved and be irradiated in subject The intensity of irradiation light.Therefore, when observing the positions such as stomach, bright shooting image can also be obtained.

In addition, when electronic endoscope system 1 is in special observing pattern, as shown in (b) of Fig. 4, spectrophotometric intensity distribution It is 1 that D111 is consistent with the peak strength of D112, but it's not limited to that for the utility model.For example, under special observing pattern, Can also when with common observing pattern compared with reduce driving current and drop it is low intensive in a manner of, to second light source unit 112 into Row, which shines, to be driven.Other waves are relatively higher than as the intensity near the wavelength 415nm of the peak value of the absorbance of hemoglobin as a result, The intensity (becoming narrow-band light) of section can obtain the stronger shooting image for adjusting superficial blood vessel.

In addition, listing following fluorophor as illustration in the fluorophor used in the present embodiment.As big point Class can enumerate oxide system fluorophor and nitride fluorophor.

" oxide system fluorophor "

< yellow fluorophor >

With Y₃Al₅O₁₂(yttrium aluminum oxide) is the yellow fluorophor of host crystal

< green-emitting phosphor >

With Ca₃Sc₂Si₃O₁₂(calcium scandium Si oxide) activates the green-emitting phosphor of Ce for host crystal

With CaSc₂O₄(calcium scandium oxide) activates the green-emitting phosphor of Ce for host crystal

" nitride fluorophor "

< red-emitting phosphors >

By by silicon nitrogen oxides (Si₂N₂O) it is dissolved in the calcium aluminum-silicon nitride that Eu is activated as host crystal (CaAlSiN₃) obtained from red-emitting phosphors

Other fluorophor of < >

It is responsible for the luminous micro metal ion of rare earth element etc. by adding into the ceramic crystal as matrix Obtained from Sialon phosphor, as alpha-form si nitride (Si₃N₄) crystal solid solution α-Sialon phosphor, CaCl2 aluminium silicon (CaAlSiN₃) fluorophor etc.

(second embodiment)

Then, the light source device for endoscope being related to the utility model second embodiment is illustrated.Second implements In the same manner as the light supply apparatus 201 that the light supply apparatus that mode is related to and first embodiment are related to, also in electronic endoscope system 1 It uses.

Fig. 5 is the light source unit and dichronic mirror conceptually only shown in the light supply apparatus 202 that second embodiment is related to Block diagram.Light supply apparatus 202 includes first light source unit 211, second light source unit 212 and the first dichronic mirror 231.Each light source Unit 211,212 is individually carried out the control that shines by the first light source driving circuit of illustration omitted, second light source driving circuit respectively System.

As shown in figure 5, first light source unit 211 has the light for projecting purple wave band (for example, wavelength is 395~435nm) Purple LED211a and blue emitting phophor 211b.Blue emitting phophor 211b is swashed by the purple LED light projected from purple LED211a Hair issues the fluorescence of blue wave band (for example, wavelength is 430~550nm).The not shown fluorophor of blue emitting phophor 211b is inserted Pull out mechanism supports be can relative to the purple LED light projected from purple LED211a optical path into and out.In addition, blue is glimmering Body of light 211b is separated with purple LED211a, therefore in Fig. 5, blue emitting phophor 211b and the different frame of purple LED211a It shows.

In addition, as shown in figure 5, second light source unit 212, which has, projects blue wave band (for example, wavelength is 420~480nm) Light blue led, green-emitting phosphor and red-emitting phosphors.Green-emitting phosphor is swashed by the blue LED light projected from blue led Hair issues the fluorescence of green band (for example, wavelength is 510~630nm).The blue that red-emitting phosphors are projected from blue led LED light excitation issues the fluorescence of red band (for example, wavelength is 550~750nm).In addition, green-emitting phosphor and red fluorescence Body can configure side by side along the injection direction of blue LED light, can also be along the direction vertical with the injection direction of blue LED light simultaneously Column configuration.In addition, its material can also be mixed and be formed as a fluorophor by green-emitting phosphor and red-emitting phosphors.

The collimation lens of illustration omitted is each configured in front of the injection direction of each light source unit 211,212.From The light that one light source unit 211 projects is converted to directional light by collimation lens, and is incident on dichronic mirror 231.In addition, from the second light The light that source unit 212 projects is converted to directional light by collimation lens, and is incident on dichronic mirror 231.The synthesis of dichronic mirror 231 is from the The optical path of the optical path for the light that one light source unit 211 projects and the light projected from second light source unit 212.It is synthesized by dichronic mirror 231 The light of optical path is projected as irradiation light L from light supply apparatus 202.

Fig. 6 is figure identical with Fig. 4, shows the light splitting of the irradiation light L projected in each observing pattern from light supply apparatus 202 Intensity distribution.

When electronic endoscope system 1 is in common observing pattern, blue emitting phophor 211b is being inserted into optical path it Afterwards, the driving that shines is carried out to both first light source unit 211 and second light source unit 212.

The spectrophotometric intensity distribution D211 of the light projected from first light source unit 211 is about 415 nm in wavelength and wavelength is about There is peak value at 470nm.The two wavelength are the peak wavelength and blue emitting phophor from the purple LED211a light projected respectively The peak wavelength for the fluorescence that 211b is issued.

From second light source unit 212 project light spectrophotometric intensity distribution D212 wavelength be about 450 nm, 550nm, There is peak value at 650nm.These three wavelength are blue LED light, the fluorescence of green-emitting phosphor sending and red-emitting phosphors hair respectively The peak wavelength of fluorescence out.

In addition, being shown in broken lines the cutoff wavelength λ 231 of dichronic mirror 231 in Fig. 6 (a).Dichronic mirror 231 has about The cutoff wavelength λ 231 of 510nm penetrates the light of the wave band shorter than cutoff wavelength λ 231, and 231 or more reflective stopping wavelength X The light of wave band.Therefore, in the distribution of the spectrophotometric intensity shown in Fig. 6 (a) D211, the light of wave band shown in solid penetrates dichronic mirror 231, the light of wave band shown in dotted line is reflected by dichronic mirror 231.In addition, in the distribution of the spectrophotometric intensity shown in Fig. 6 (a) D212, The light of wave band shown in solid is reflected by dichronic mirror 231, and the light of wave band shown in dotted line penetrates dichronic mirror 231.

The optical path of the light projected from each light source unit 211,212 is synthesized by dichronic mirror 231 as a result, and from light supply apparatus 202 project from ultraviolet region (a part of near ultraviolet) to red area with broadband irradiation light L (normal light).The irradiation The spectrophotometric intensity distribution of light L (normal light) is will be shown in solid in the distribution of spectrophotometric intensity shown in Fig. 6 (a) D211, D212 Region merging technique and obtain.By the way that irradiation light L (normal light) to be irradiated in subject, common color camera figure can be obtained Picture.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 211b from optical path After extraction, the driving that shines is carried out to both first light source unit 211 and second light source unit 212.Irradiation light L is (special as a result, Light) in become hemoglobin absorbance peak value wavelength 415nm near the ratio of light relatively heighten and (become narrow-band Light), the shooting image for emphasizing superficial blood vessel can be obtained.

In addition, second light source unit 212 has green-emitting phosphor and red-emitting phosphors the two fluorophor.Therefore, with The case where two light source units 212 have a fluorophor is compared, and electronic endoscope system 1 is in photograph when common observing pattern The spectrophotometric intensity for penetrating light L (normal light) is distributed in visibility region close to flat.Thus, it is possible to be used in common observing pattern Irradiation light L (normal light) close to nature white light illuminates subject.

(3rd embodiment)

Then, the light source device for endoscope being related to the utility model third embodiment is illustrated.Third is implemented The light supply apparatus that mode is related to also makes in electronic endoscope system 1 in the same manner as the light supply apparatus 201 of first embodiment With.

Fig. 7 is the light source unit and dichronic mirror conceptually only shown in the light supply apparatus 203 that third embodiment is related to Block diagram.Light supply apparatus 203 includes first light source unit 311, second light source unit 312,313, first points of third light source unit Look mirror 331 and the second dichronic mirror 332.Each light source unit 311~313 respectively by the first light source driving circuit of illustration omitted~ Third light source driving circuit individually carries out light emitting control.

As shown in fig. 7, the light supply apparatus 203 that third embodiment is related to is by third light source unit 313 and the second color separation Mirror 332 is appended to the structure for the light supply apparatus 201 that first embodiment is related to.In addition, first light source unit 311, second light source Unit 312, dichronic mirror 331 characteristic respectively with the first light source unit 111 of first embodiment, second light source unit 112, point The characteristic of Look mirror 131 is identical.Third light source unit 313 is the light for projecting red band (for example, wavelength is 620~680nm) Red LED.The cutoff wavelength λ 332 of dichronic mirror 332 is 630nm.Dichronic mirror 332 penetrates the light of the wave band than cut-off wave length, And the light of wave band more than reflective stopping wavelength.

Fig. 8 is figure identical with Fig. 4, shows the light splitting of the irradiation light L projected in each observing pattern from light supply apparatus 203 Intensity distribution.

When electronic endoscope system 1 is in common observing pattern, blue emitting phophor 311b is being inserted into optical path it Afterwards, the driving that shines is carried out to first light source 311~third of unit light source unit 313.As shown in (a) of Fig. 8, third embodiment In the spectrophotometric intensity distribution of irradiation light L the spectrophotometric intensity of red LED 313 distribution D313 is appended in first embodiment Irradiation light L.But be different from the first embodiment, the light supply apparatus 203 of third embodiment has dichronic mirror 332, therefore The light of the light of the cutoff wavelength λ 332 (630 nm) or more of a length of dichronic mirror 332 of light medium wave projected from second light source unit 312 Road is not synthesized by dichronic mirror 332, and is not projected as irradiation light L.In addition, the light medium wave projected from third light source unit 313 The optical path of the long light shorter than cutoff wavelength λ 332 is not synthesized by dichronic mirror 332, and is not projected as irradiation light L.

The light supply apparatus 203 of third embodiment has red LED 313.Therefore, with do not have red LED 313 structure It compares, the spectrophotometric intensity of the irradiation light L (normal light) when electronic endoscope system 1 is in common observing pattern is distributed in visible Close to flat in region.Thereby, it is possible in common observing pattern, with the irradiation light L (normal light) close to nature white light to quilt Body is taken the photograph to be illuminated.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 211b from optical path After extraction, the driving that shines is carried out to first light source unit 311 and second light source unit 312, without to third light source unit 313 Carry out the driving that shines.As a result, near the wavelength 415nm in irradiation light L (special light) as the peak value of the absorbance of hemoglobin The ratio of light relatively heighten and (become narrow-band light), the shooting image for emphasizing superficial blood vessel can be obtained.

In addition, the light supply apparatus 203 of third embodiment has wave band different and can individually carry out light emitting control Three light source units 311~313.Therefore, by selecting to carry out the light driven that shines from three light source units 311~313 Source unit simultaneously individually controls driving current when shining driving, can be finely controlled the spectrophotometric intensity distribution of irradiation light L.

(the 4th embodiment)

Then, the light source device for endoscope being related to the 4th embodiment of the utility model is illustrated.4th implements In the same manner as the light supply apparatus 201 that the light supply apparatus that mode is related to and first embodiment are related to, also in electronic endoscope system 1 It uses.

Fig. 9 is the light source unit and dichronic mirror conceptually only shown in the light supply apparatus 204 that the 4th embodiment is related to Block diagram.Light supply apparatus 204 includes first light source unit 411, second light source unit 412,413, first points of third light source unit Look mirror 431 and the second dichronic mirror 432.Each light source unit 411~413 respectively by the first light source driving circuit of illustration omitted~ Third light source driving circuit individually carries out light emitting control.

As shown in figure 9, the light supply apparatus that third embodiment is related to by the light supply apparatus 204 that the 4th embodiment is related to Second light source unit 312 in 203 replaces with the LED without fluorophor.Second light source unit 412 is to project green band The green LED of the light of (for example, wavelength is 520~580nm).In addition, first light source unit 411, third light source unit 413 and First dichronic mirror 431, the second dichronic mirror 432 characteristic need not first light source unit 311, third light source with third embodiment The characteristic of unit 313 and the first dichronic mirror 331, the second dichronic mirror 332 is identical.

Figure 10 is figure identical with Fig. 4, shows point of the irradiation light L projected in each observing pattern from light supply apparatus 204 Light intensity distributions.

When electronic endoscope system 1 is in common observing pattern, blue emitting phophor 411b is being inserted into optical path it Afterwards, the driving that shines is carried out to first light source 311~third of unit light source unit 313.

The spectrophotometric intensity distribution D411 of the light projected from first light source unit 411 is about 415 nm in wavelength and wavelength is about There is peak value at 470nm.The two wavelength are the peak wavelength and blue emitting phophor from the purple LED411a light projected respectively The peak wavelength for the fluorescence that 411b is issued.The spectrophotometric intensity distribution D412 of the light projected from second light source unit 412 has with about 550nm is the intensity distribution of peak wavelength.The spectrophotometric intensity distribution D413 of the light projected from third light source unit 413 has with about 640nm is the intensity distribution of peak wavelength.

In addition, being shown in broken lines cutoff wavelength λ 431, the λ 432 of each dichronic mirror 431,432 in (a) of Figure 10.Cut-off Wavelength X 431, λ 432 are respectively 510nm, 590nm.Any dichronic mirror 431,432 all makes the light than the wave band of cut-off wave length saturating It crosses, and the light of wave band more than reflective stopping wavelength.By these dichronic mirrors 431,432, penetrated from each light source unit 411~413 The optical path of light out is synthesized and projects as irradiation light L (normal light).By by irradiation light L (normal light) be irradiated to by It takes the photograph on body, common color camera image can be obtained.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 411b from optical path After extraction, the driving that shines is carried out to first light source unit 411 and second light source unit 412, without to third light source unit 413 Carry out the driving that shines.As a result, near the wavelength 415nm in irradiation light L (special light) as the peak value of the absorbance of hemoglobin The ratio of light relatively heighten and (become narrow-band light), the shooting image for emphasizing superficial blood vessel can be obtained.

(the 5th embodiment)

Then, the light source device for endoscope being related to the 5th embodiment of the utility model is illustrated.5th implements In the same manner as the light supply apparatus 201 that the light supply apparatus that mode is related to and first embodiment are related to, also in electronic endoscope system 1 It uses.

Figure 11 is the light source unit and dichronic mirror conceptually only shown in the light supply apparatus 205 that the 5th embodiment is related to Block diagram.Light supply apparatus 205 includes first light source unit 511, second light source unit 512 and the first dichronic mirror 531.Each light source list Member 511,512 individually carries out light emitting control by the first light source driving circuit of illustration omitted, second light source driving circuit respectively.

As shown in figure 11, first light source unit 511 has fluorophor LED511a and blue emitting phophor 511b.Fluorophor LED511a has the purple LED for the light for projecting purple wave band (for example, wavelength is 395~435nm) and is mounted on the purple LED Light-emitting surface on green-emitting phosphor.The purple LED light excitation that green-emitting phosphor is projected from purple LED, issues green band The fluorescence of (for example, wavelength is 510~630nm).The purple LED light excitation that blue emitting phophor 511b is projected from purple LED, Issue the fluorescence of blue wave band (for example, wavelength is 430~550nm).The not shown fluorophor plug of blue emitting phophor 511b Mechanism supports be can relative to the light projected from fluorophor LED511a optical path into and out.

In addition, as shown in figure 11, second light source unit 512 is to project red band (for example, wavelength is 620~680nm) Light red LED.Dichronic mirror 531 synthesizes the optical path of light projected from first light source unit 511 and from second light source unit The optical path of 512 light projected.It is projected as irradiation light L from light supply apparatus 205 by the light that dichronic mirror 531 synthesizes optical path.

Figure 12 is figure identical with Fig. 4, shows point of the irradiation light L projected in each observing pattern from light supply apparatus 205 Light intensity distributions.

When electronic endoscope system 1 is in common observing pattern, blue emitting phophor 511b is being inserted into optical path it Afterwards, the driving that shines is carried out to first light source unit 511, second light source unit 512.

From first light source unit 511 project light spectrophotometric intensity distribution D511 wavelength be about 415 nm, 470nm, There is peak value at 550nm.These three wavelength are issued from the purple LED light of purple LED injection, blue emitting phophor 511b respectively The peak wavelength for the fluorescence that fluorescence and green-emitting phosphor issue.The spectrophotometric intensity distribution of the light projected from second light source unit 512 D512 has using the wavelength of about 650 nm as the intensity distribution of peak wavelength.

In addition, being shown in broken lines the cutoff wavelength λ 531 of dichronic mirror 531 in (a) of Figure 12.Cutoff wavelength λ 531 is 620nm.Dichronic mirror 531 penetrates the light of the wave band than cut-off wave length, and the light of wave band more than reflective stopping wavelength.Pass through The optical path of the dichronic mirror 531, the light projected from first light source unit 511 and second light source unit 512 is synthesized and as irradiation Light L is projected.By the way that irradiation light L (normal light) to be irradiated in subject, common color camera image can be obtained.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 511b from optical path After extraction, the driving that shines only is carried out to first light source unit 511, without carrying out the driving that shines to second light source unit 512.By This, as the opposite change of ratio of the light near the wavelength 415nm of the peak value of the absorbance of hemoglobin in irradiation light L (special light) High (becoming narrow-band light), can obtain the shooting image for emphasizing superficial blood vessel.

In addition, the green-emitting phosphor of first light source unit 511 is mounted on shining for purple LED in the 5th embodiment On face, but it's not limited to that for the utility model.It is pulled out for example, the green-emitting phosphor of first light source unit 511 can also can be inserted into It is configured in the optical path of the light projected from purple LED out.In this case, special sight is in electronic endoscope system 1 When examining mode, by the way that green-emitting phosphor is inserted into optical path or is extracted from optical path, it can change and be irradiated in subject The spectrophotometric intensity characteristic of irradiation light L.

(sixth embodiment)

Then, the light source device for endoscope being related to the utility model sixth embodiment is illustrated.6th implements In the same manner as the light supply apparatus 201 that the light supply apparatus that mode is related to and first embodiment are related to, also in electronic endoscope system 1 It uses.

Figure 13 is the light source unit and dichronic mirror conceptually only shown in the light supply apparatus 206 that sixth embodiment is related to Block diagram.Light supply apparatus 206 includes first light source unit 611, second light source unit 612 and the first dichronic mirror 631.Each light source list Member 611,612 individually carries out light emitting control by the first light source driving circuit of illustration omitted, second light source driving circuit respectively.

As shown in figure 13, first light source unit 611 has fluorophor LED611a and red-emitting phosphors 611b.Fluorophor LED611a has the blue led for the light for projecting blue wave band (for example, wavelength is 430~490nm) and is mounted on the blue led Light-emitting surface on green-emitting phosphor.The blue LED light excitation that green-emitting phosphor is projected from blue led, issues green band The fluorescence of (for example, wavelength is 510~630nm).The blue led light excitation that red-emitting phosphors 611b is projected from blue led, Issue the fluorescence of red band (for example, wavelength is 550~750nm).The not shown fluorophor plug of red-emitting phosphors 611b Mechanism supports be can relative to the light projected from fluorophor LED611a optical path into and out.

In addition, as shown in figure 13, second light source unit 612 is to project purple wave band (for example, wavelength is 395~435nm) Light purple LED.Dichronic mirror 631 synthesizes the optical path of light projected from first light source unit 611 and from second light source unit The optical path of 612 light projected.It is projected as irradiation light L from light supply apparatus 206 by the light that dichronic mirror 631 synthesizes optical path.

Figure 14 is figure identical with Fig. 4, shows point of the irradiation light L projected in each observing pattern from light supply apparatus 206 Light intensity distributions.

When electronic endoscope system 1 is in common observing pattern, red-emitting phosphors 611b is being inserted into optical path it Afterwards, the driving that shines is carried out to first light source unit 611, second light source unit 612.

From first light source unit 611 project light spectrophotometric intensity distribution D611 wavelength be about 460 nm, 550nm, There is peak value at 650nm.These three wavelength be respectively from fluorophor LED611a project blue LED light and green fluorescence, The peak value of the spectrophotometric intensity distribution for the fluorescence that red-emitting phosphors 611b is issued.The light splitting of the light projected from second light source unit 612 Intensity distribution D612 has using about 415nm as the intensity distribution of peak value.

In addition, being shown in broken lines the cutoff wavelength λ 631 of dichronic mirror 631 in (a) of Figure 14.Cutoff wavelength λ 631 is 440nm.Dichronic mirror 631 penetrates the light of the wave band than cut-off wave length, and the light of wave band more than reflective stopping wavelength.Pass through The optical path of the dichronic mirror 631, the light projected from first light source unit 611 and second light source unit 612 is synthesized and as irradiation Light L is projected.By the way that irradiation light L (normal light) to be irradiated in subject, common color camera image can be obtained.

In addition, when electronic endoscope system 1 is in special observing pattern, by red-emitting phosphors 611b from optical path After extraction, the driving that shines is carried out to first light source unit 611 and second light source unit 612.Irradiation light L (special light) as a result, In become hemoglobin absorbance peak value wavelength 415nm near the ratio of light relatively heighten and (become narrow-band Light), the shooting image for emphasizing superficial blood vessel can be obtained.

(the 7th embodiment)

Then, the light source device for endoscope being related to the 7th embodiment of the utility model is illustrated.7th implements In the same manner as the light supply apparatus 201 that the light supply apparatus that mode is related to and first embodiment are related to, also in electronic endoscope system 1 It uses.

Figure 15 is the block diagram for conceptually only showing the light source unit in the light supply apparatus 207 that the 7th embodiment is related to. Light supply apparatus 207 includes light source unit 711.Light source unit 711 carries out light emitting control by the light source driving circuit of illustration omitted.

As shown in figure 15, light source unit 711 has fluorophor LED711a, blue emitting phophor 711b and red-emitting phosphors 711c.Fluorophor LED711a has purple LED and the installation for the light for projecting purple wave band (for example, wavelength is 395~435nm) Green-emitting phosphor on the light-emitting surface of purple LED.The purple LED light excitation that the green-emitting phosphor is projected from purple LED, hair The fluorescence of green band (for example, wavelength is 510~630nm) out.

The purple LED light excitation that blue emitting phophor 711b is projected from purple LED, issues blue wave band (for example, wavelength is 430~550nm) fluorescence.The purple LED light excitation that red-emitting phosphors 711c is projected from purple LED, issues red band The fluorescence of (for example, wavelength is 550~750nm).Blue emitting phophor 711b and red-emitting phosphors 711c passes through fluorescence (not shown) Body push-pull structure is individually inserted into and extracts from the optical path of the fluorophor LED711a light projected or from the optical path.

Figure 16 is figure identical with Fig. 4, shows point of the irradiation light L projected in each observing pattern from light supply apparatus 207 Light intensity distributions.

When electronic endoscope system 1 is in common observing pattern, by blue emitting phophor 711b and red-emitting phosphors After 711c is inserted into optical path, the driving that shines is carried out to light source unit 711.

From light source unit 711 project light spectrophotometric intensity distribution D711 wavelength be about 415nm, 470nm, 550nm, There is peak value at 650nm.This four wavelength are the purple LED light projected from fluorophor LED711a, blue emitting phophor respectively The fluorescence of fluorescence, red-emitting phosphors 711c sending that the green-emitting phosphor of fluorescence, fluorophor LED711a that 711b is issued issues Peak wavelength.The light projected from light source unit 711 is irradiated in subject as irradiation light L (normal light).Thereby, it is possible to obtain Common color camera image.

In addition, when electronic endoscope system 1 is in special observing pattern, by blue emitting phophor 711b and red fluorescence After body 711c is extracted from optical path, the driving that shines is carried out to light source unit 711.Become blood in irradiation light L (special light) as a result, The ratio of light near 415 nm of wavelength of the peak value of the absorbance of Lactoferrin relatively heightens and (becomes narrow-band light), can obtain It must emphasize the shooting image of superficial blood vessel.

In addition, the light supply apparatus 207 of the 7th embodiment only has a light source unit, therefore it can simplify light supply apparatus 207 structure.In addition, light source unit 711 has red, blue, these three green fluorophor.Compared with the light projected from LED, Fluorophor has wider wave band.Therefore, compared with light source unit 711 has the case where one or two fluorophor, in electronics The spectrophotometric intensity of irradiation light L (normal light) when endoscope system 1 is in common observing pattern is distributed in visibility region close to flat It is smooth.Thereby, it is possible to be illuminated with the irradiation light L (normal light) close to nature white light to subject.

It is the explanation of the illustrative embodiments of the utility model above.The embodiments of the present invention is not limited to Above explained embodiment can carry out various modifications in the range of the technical idea of the utility model.For example, by explanation Content made of embodiment illustratively expressed in book etc. or obvious embodiment etc. are appropriately combined is also contained in In the embodiments of the present invention.For example, in the respective embodiments described above, by LED it is assumed that solid-state light emitting element.This is practical Novel it's not limited to that, can also be used as solid-state light emitting element using LD (Laser Diode: laser diode).

Figure 17 shows the spectrophotometric intensity of the irradiation light L projected in the variation of the 4th embodiment from light supply apparatus 204 Distribution.In this variation, there are four types of observing pattern (common observing pattern, the first special observing pattern, the second special observation moulds The special observing pattern of formula, third).(a) of Figure 17 shows the spectrophotometric intensity of the irradiation light L (normal light) in common observing pattern Distribution, (b) of Figure 17 show the spectrophotometric intensity distribution of the irradiation light L (special light) in the first special observing pattern, Figure 17's (c) the spectrophotometric intensity distribution of the irradiation light L (special light) in the second special observing pattern is shown, (d) of Figure 17 shows third spy The spectrophotometric intensity distribution of irradiation light L (special light) in different observing pattern.The horizontal axis of the distribution of spectrophotometric intensity shown in Figure 17 indicates Wavelength (nm), the longitudinal axis indicate the intensity of irradiation light L.In addition, the longitudinal axis is normalized in such a way that the maximum value of intensity is 1.

Operation when common observing pattern is identical as the 4th embodiment illustrated using Fig. 9 and Figure 10.Therefore, common When observing pattern, the irradiation light L (normal light) with the identical dichroism with (a) of Figure 10 is projected.By by irradiation light L (normal light) is irradiated in subject, can obtain common color camera image.

When electronic endoscope system 1 is in the first special observing pattern, pulled out from optical path by blue emitting phophor 411b After out, the driving that shines is carried out to first light source unit 411, without to second light source unit 412 and third light source unit 413 into Row, which shines, to be driven.As a result, as the light near the wavelength 415nm of the peak value of hemoglobin absorption degree in irradiation light L (special light) Ratio relatively heighten (that is, become only has narrow-band light of peak value near wavelength 415nm), can obtain and mainly emphasize The shooting image of superficial blood vessel.

When electronic endoscope system 1 is in the second special observing pattern, pulled out from optical path by blue emitting phophor 411b After out, the driving that shines is carried out to second light source unit 412, without to first light source unit 411 and third light source unit 413 into Row, which shines, to be driven.As a result, as the light near the wavelength 550nm of the peak value of hemoglobin absorption degree in irradiation light L (special light) Ratio relatively heighten and (become the narrow-band light only near wavelength 550nm with peak value), can obtain and mainly emphasize The shooting image of layer blood vessel.

When electronic endoscope system 1 is in the special observing pattern of third, pulled out from optical path by blue emitting phophor 411b After out, the driving that shines is carried out to third light source unit 413, without to first light source unit 411 and second light source unit 412 into Row, which shines, to be driven.As a result, as the light near the wavelength 650nm of the peak value of hemoglobin absorption degree in irradiation light L (special light) Ratio relatively heighten and (become the narrow-band light only near wavelength 650nm with peak value), can obtain and mainly emphasize depth The shooting image of layer blood vessel.

In this way, in this variation, in the first special observing pattern, the shooting for mainly emphasizing superficial blood vessel can be obtained Image can obtain the shooting image for mainly emphasizing middle layer blood vessel, in the special observation mould of third in the second special observing pattern In formula, the shooting image for mainly emphasizing deep-level blood vessel can be obtained.That is, in this variation, it is each by first~third of switching Special observing pattern, can observe the desired layer domain of Special attention will be given to (is surface layer under the first special observing pattern, in the second spy Be middle layer under different observing pattern, be deep layer under the special observing pattern of third) blood vessel image.

In the 7th embodiment, blue emitting phophor 711b and red-emitting phosphors 711c is inserted into common observing pattern Onto optical path, blue emitting phophor 711b and red-emitting phosphors 711c are extracted from optical path in special observing pattern.Therefore, exist In 7th embodiment, blue emitting phophor 711b and red-emitting phosphors 711c according to the observation mode carry out it is identical into and out It operates (operation of link).In contrast, in the variation of the 7th embodiment, blue emitting phophor 711b and red-emitting phosphors 711c according to the observation mode without identical into and out operation, and carry out others into and out operation.

Specifically, also having added two kinds of special observing patterns (first and in the variation of the 7th embodiment Two special observing patterns).In the first special observing pattern, after extracting blue emitting phophor 711b from optical path, to glimmering Body of light LED711a and red-emitting phosphors 711c carries out the driving that shines.On the other hand, in the second special observing pattern, will be red After color fluorophor 711c is extracted from optical path, the driving that shines is carried out to fluorophor LED711a and blue emitting phophor 711b.That is, In this variation, (blue emitting phophor 711b, red are glimmering for the light activated multiple fluorophor projected from fluorophor LED711a Body of light 711c) configuration is in the optical path of fluorophor LED711a side by side, and mode carries out other insert to each fluorophor according to the observation Enter and extract operation and (red-emitting phosphors 711c is extracted when being inserted into blue emitting phophor 711b, when being inserted into red-emitting phosphors 711c Extract blue emitting phophor 711b).

In the electronic endoscope system that above embodiment is related to, using use special light (narrow-band light) generate and show Show the structure for emphasizing the narrow-band observation image of blood vessel, but in the electronic endoscope system that other embodiments are related to, it can also With using quantitatively analyzed based on the multiple images taken the photograph with the different photo-beat of wavelength region subject Biont information (it is specific and Speech is oxygen saturation) and make the structure of its image conversion.

Figure 18 shows the block diagram for the light supply apparatus 208 that another embodiment is related to.For convenience's sake, implement based on first Mode is illustrated another embodiment.As shown in figure 18, light supply apparatus 208 is such as flowering structure: being implemented relative to first The light supply apparatus 201 that mode is related to replaces second light source unit 112 by second light source unit 112 ', and has added rotary Turntable 400 and filter rotating mechanism 430.

Figure 19 is light source unit, the dichronic mirror conceptually only shown in the light supply apparatus 208 that other embodiments are related to And the block diagram of rotating turret.Second light source unit 112 ' has blue led 112a, without yellow fluorophor 112b.

Figure 20 is the figure for showing the structure of rotating turret 400.As shown in figure 20, filter rotating mechanism 430 is constituted The motor shaft 432 of DC motor is press-fitted in the bearing hole for being formed in the center of rotating turret 400.Rotating turret 400 by 430 pivotal support of filter rotating mechanism is that can carry out rotation process around motor shaft 432.In addition, filter rotating mechanism 430 Using well known structure, therefore the detailed description about filter rotating mechanism 430 is omitted here.

On rotating turret 400, circumferentially there are four openings for formation side by side.Different fluorophor, which is embedded in, respectively to be opened In mouthful.Specifically, being embedded with yellow fluorophor 112b ', the observation of the first oxygen saturation fluorophor Fs1, the second oxygen saturation Observation fluorophor Fs2, narrow-band observation fluorophor Fs3.In another embodiment, by using rotating turret 400, Other than showing according to the common observation image of common observing pattern and observing image according to the narrow-band of special observing pattern, It can also show the oxygen saturation distributed image according to oxygen saturation observing pattern.

Here, the Computing Principle of the oxygen saturation in the dichroism and present embodiment of hemoglobin is illustrated.

Figure 21 shows the absorption spectrum of the hemoglobin near 550nm.Hemoglobin has near 550nm from porphin The strong absorption band for being referred to as Q band of quinoline.The absorption spectrum of hemoglobin (aoxidizes blood red according to oxygen saturation in all hemoglobins Ratio shared by albumen) and change.In Figure 21 solid line waveform indicate oxygen saturation be 100% when (that is, oxygenated haemoglobin Hb0's) absorption spectrum, when the waveform expression oxygen saturation of long dotted line is 0% (that is, reduced hemoglobin Hb) absorption light Spectrum.In addition, short dash line indicate in-between oxygen saturation (10,20,30 ... 90%) under hemoglobin (oxygenated haemoglobin and The mixture of reduced hemoglobin) absorption spectrum.

As shown in figure 21, in Q sections, oxygenated haemoglobin and reduced hemoglobin have mutually different peak wavelength. Specifically, oxygenated haemoglobin has absorption peak P1 near wavelength 542nm, there is absorption peak near wavelength 578nm P3.On the other hand, reduced hemoglobin has absorption peak P2 near 558nm.Figure 21 is that each component (go back by oxygenated haemoglobin Former hemoglobin) the sum of concentration be the absorption spectrum of two constant component systems, therefore occur being absorbed as it is constant and and each component Unrelated isobestic point E1, E2, E3, the E4 of concentration (i.e. oxygen saturation).

In the following description, the wavelength region clipped by isobestic point E1 and E2 is labeled as " wavelength region R1 ", it will The wavelength region clipped by isobestic point E2 and E3 is labeled as " wavelength region R2 ", the wave that will be clipped by isobestic point E3 and E4 Long zone marker is " wavelength region R3 ".In addition, by the wavelength region clipped by isobestic point E1 and E4 (i.e. wavelength region R1, The combination of R2 and R3) it is labeled as " wavelength region R0 ".

In addition, wavelength region R0 is 528nm~584nm.Wavelength region R2 is 546nm~570nm.

As shown in figure 21, between adjacent isobestic point, relative to oxygen saturation, absorption is monotonously increased or decreased. In addition, the absorption of hemoglobin substantially linearly changes relative to oxygen saturation between adjacent isobestic point.

Specifically, the absorption A of the hemoglobin in wavelength region R1, R3_R1、A_R3Relative to the dense of oxygenated haemoglobin Degree (oxygen saturation) is linearly increased monotonically, the absorption A of the hemoglobin in wavelength region R2_R2Relative to reduced hemoglobin Concentration (1- oxygen saturation) is linearly increased monotonically.Therefore, the index X defined by following formula (1) is relative to oxygenated haemoglobin Concentration (oxygen saturation) is linearly increased monotonically.

(formula 1)

X=(A_R1+A_R3)-A_R2

It therefore, can be according to index X's if first passing through the quantitative relationship that experiment obtains oxygen saturation and index X in advance Value calculates oxygen saturation.

First oxygen saturation observation is the light activated fluorophor projected from blue led 112a with fluorophor Fs1, is issued The fluorescence of 550nm wave band.As shown in figure 21, the first oxygen saturation observation is issued from isobestic point E1 to E4 with fluorophor Fs1 The fluorescence of wavelength region (that is, wavelength region R0), the fluorescence without issuing wavelength region in addition to this.Second oxygen saturation is seen Examining with fluorophor Fs2 is the light activated fluorophor projected from blue led 112a, issues the wave from isobestic point E2 to E3 The fluorescence of long region (that is, wavelength region R2), the fluorescence without issuing wavelength region in addition to this.

Yellow fluorophor 112b ' is the light activated fluorophor projected from blue led 112a, sending and yellow fluorophor The identical fluorescence of 112b.Narrow-band observation, which issues specified bio-tissue (mainly deep-level blood vessel) with fluorophor Fs3, inhales The fluorescence of the high 650nm wave band (630~650nm) of luminosity, the fluorescence without issuing wavelength region in addition to this.

In addition, also may include LED (purple LED, green LED etc.) the next generation of other colors in other embodiments For blue led 112a.In this case, the first oxygen saturation observation is with fluorophor Fs1 by being penetrated by above-mentioned other colors LED Light out issues the fluorescence of wavelength region R0.Second oxygen saturation observation is passed through with fluorophor Fs2 by above-mentioned other colors LED The light of injection issues the fluorescence of wavelength region R2.Yellow fluorophor 112b ' passes through the LED injection by other above-mentioned colors Light issues fluorescence identical with yellow fluorophor 112b.

In this way, configured with the multiple fluorophor (yellow fluorescences for being respectively provided with the different characteristics of luminescences on rotating turret 400 Body 112b ', the first oxygen saturation observation fluorophor Fs1, the second oxygen saturation observation fluorophor Fs2, narrow-band observation are used Fluorophor Fs3).

In common observing pattern, after blue emitting phophor 111b is inserted into optical path, to first light source unit 111 And second light source unit 112 ' carries out the driving that shines, and the shape in the optical path that yellow fluorophor 112b ' is located at irradiation light L Stop rotating turret 400 under state.Therefore, in common observing pattern, projecting has same as the first embodiment point The irradiation light L (normal light) of light characteristic (referring to (a) of Fig. 4).By the way that irradiation light L (normal light) is irradiated in subject, Common color camera image can be obtained.

In special observing pattern, by blue emitting phophor 111b from optical path extract after, to first light source unit 111 And second light source unit 112 ' carries out the driving that shines, and the shape in the optical path that yellow fluorophor 112b ' is located at irradiation light L Stop rotating turret 400 under state.Therefore, in special observing pattern, also projecting has identical with first embodiment point The irradiation light L (normal light) of light characteristic (referring to (b) of Fig. 4).Become the suction of hemoglobin in irradiation light L (special light) as a result, The ratio of light near the wavelength 415nm of the peak value of luminosity relatively heightens and (becomes narrow-band light), can obtain and mainly emphasize The shooting image of superficial blood vessel.

In oxygen saturation observing pattern, by blue emitting phophor 111b from optical path extract after, to first light source list Member 111 and second light source unit 112 ' carry out the driving that shines, and primary with the rotation of every four frame by filter rotating mechanism 430 Period come rotate driving rotating turret 400 so that yellow fluorophor 112b ', the first oxygen saturation observation use fluorophor Fs1, the second oxygen saturation observation fluorophor Fs2, narrow-band observation are with each fluorophor such as fluorophor Fs3 synchronous with frame rate The timing of (synchronous with imaging cycle) is sequentially inserted into the optical path of irradiation light L.In addition, in oxygen saturation observing pattern, The driving that shines can not be carried out to first light source unit 111.

Through-hole 402 is formed on rotating turret 400.System controller 21 is based on constituting filter rotating mechanism 430 Light breaker 434 to the detection of through-hole 402 timing, detect and adjust the rotatable phase of rotating turret 400.As a result, in oxygen During saturation degree observing pattern, rotating turret 400 is driven with constant speed (rotating the primary period with every four frame) by rotation It is dynamic.

It will be observed as a result, with yellow fluorophor 112b ', the first oxygen saturation observation fluorophor Fs1, the second oxygen saturation It is sequentially irradiated to fluorophor Fs2, narrow-band observation with the corresponding irradiation light L (fluorescence) of each fluorophor such as fluorophor Fs3 shot On body.Therefore, it will be seen with via yellow fluorophor 112b ', the first oxygen saturation observation fluorophor Fs1, the second oxygen saturation The corresponding picture signal of irradiation light L with each fluorophor such as fluorophor Fs2, narrow-band observation fluorophor Fs3 is examined, is sequentially inputted Into rear class signal processing circuit 28.

Rear class signal processing circuit 28 uses above-mentioned formula (1), according to inputting from video memory 27 and the first oxygen saturation Spend the observation corresponding picture signal of fluorophor Fs1 and picture signal corresponding with the second oxygen saturation observation fluorophor Fs2 Parameter X.

In the nonvolatile memory included by rear class signal processing circuit 28 (not shown), it is logical in advance to be stored with expression Cross the numerical tabular of the quantitative relationship of the oxygen saturation for the hemoglobin that experiment obtains and the value of index X.Rear class signal processing circuit 28 referring to the numerical tabular, obtains oxygen saturation SatO corresponding with the value of above-mentioned formula (1) calculated index X is used₂(x, y). Rear class signal processing circuit 28 generates image data (oxygen saturation distributed image data), the oxygen saturation which will acquire Spend SatO₂(x, y) is multiplied by pixel value of the value as each pixel (x, y) obtained from regulation constant.

In addition, rear class signal processing circuit 28 uses fluorophor using with from the narrow-band that video memory 27 inputs The corresponding picture signal of Fs3 generates narrow-band perspective image data.

Oxygen saturation distributed image data are converted to defined video format signal by rear class signal processing circuit 28.Conversion Video format signal afterwards is output to monitor 300.Oxygen saturation point is shown on the display screen of monitor 300 as a result, Cloth image.

In another embodiment, without using dim lights mechanisms such as optical filters, oxygen saturation point is obtained Cloth image.Therefore, compared with the case where using dim light mechanism, light utilization ratio is improved.

Other than oxygen saturation distributed image data, narrow-band can also be observed image by rear class signal processing circuit 28 Data are converted to defined video format signal.In this case, on the display screen of monitor 300, in addition to showing oxygen Also show that narrow-band observes image except saturation distribution image.

In addition, making the technology of its image conversion about quantitatively analysis oxygen saturation, more specifically illustrates and for example disclose In No. 2014/192781 handbook of International Publication No..

Claims

1. a kind of light source device for endoscope characterized by comprising

First light source unit, the first light source unit include the first solid-state light emitting element, project the light of first band；And First fluorophor is excited by the light of the first band and issues the first fluorescence；And

Fluorophor push-pull structure supports first fluorophor as can be relative to projecting from first solid-state light emitting element The optical path of light into and out,

When first fluorophor insertion is projected from first solid-state light emitting element by the fluorophor push-pull structure When the optical path of light, the light of the first band and first fluorescence are projected and are supplied from the first light source unit with same optical path Endoscope should be arrived,

When by the fluorophor push-pull structure by first fluorophor light emitted by first solid-state light emitting element Optical path in when extracting, the light of the first band projects from the first light source unit and is supplied to endoscope.

2. light source device for endoscope according to claim 1, which is characterized in that

The light source device for endoscope further include:

Second light source unit projects the wave band with the peak wavelength different from the peak wavelength of wave band of first fluorescence Light；And

First optical path combination mechanism synthesizes the optical path of light projected from the first light source unit and from the second light source unit The optical path of the light of injection, and the light after synthesis optical path is supplied to the endoscope.

3. light source device for endoscope according to claim 2, which is characterized in that

The second light source unit includes the second solid-state light emitting element；And second fluorophor, by from second solid luminescence The light that element projects excites and issues the second fluorescence,

The wave band of the peak wavelength of the wave band of second fluorescence and the peak wavelength of the first band and first fluorescence Peak wavelength it is different.

4. light source device for endoscope according to claim 2 or 3, which is characterized in that

The light source device for endoscope further include:

Third light source unit, projects the light of third wave band, and the third wave band has and projects from the first light source unit The different peak wavelength of the peak wavelength of the peak wavelength of light and the light projected from the second light source unit；And

Second optical path combination mechanism, the optical path for the light that synthesis is synthesized by the first optical path combination mechanism and from the third light source The optical path for the light that unit projects, and the light after synthesis optical path is supplied to the endoscope.

5. light source device for endoscope according to any one of claim 1 to 3, which is characterized in that

The first light source unit also has third fluorophor, and the third fluorophor is penetrated from first solid-state light emitting element The light of the first band out excites, and issues the third with the peak wavelength different from the peak wavelength of first fluorescence Fluorescence,

When first fluorophor insertion is projected from first solid-state light emitting element by the fluorophor push-pull structure When the optical path of light, the light of the first band, first fluorescence, the third fluorescence are with same optical path from the first light source Unit projects and is supplied to endoscope,

When by fluorophor push-pull structure by the light of first fluorophor light emitted by first solid-state light emitting element When extracting in road, the first band and the third fluorescence are projected and are supplied to from the first light source unit with same optical path The endoscope.

6. light source device for endoscope according to claim 5, which is characterized in that

The first light source unit further includes the 4th fluorophor, and the 4th fluorophor is penetrated from first solid-state light emitting element The light of the first band out excites, and issuing has and the peak wavelength of first fluorescence and the peak value of the third fluorescence 4th fluorescence of the different peak wavelength of wavelength,

The fluorophor push-pull structure supports first fluorophor and the 4th fluorophor as can be relative to from described The optical path for the light that one solid-state light emitting element projects is individually inserted into and extracts.

7. light source device for endoscope according to any one of claim 1 to 3, which is characterized in that

The light source device for endoscope further includes turntable, and the turntable is synchronously rotated with defined imaging cycle,

On the turntable, it is circumferentially arranged in parallel with the fluorophor for being respectively provided with the different characteristics of luminescences,

When rotating the optical path of the light that each fluorophor is sequentially inserted into irradiation by the turntable, the irradiation light is sequentially As light corresponding with the fluorophor being inserted into the optical path and it is supplied to the endoscope.

8. a kind of endoscopic system characterized by comprising

Light source device for endoscope according to any one of claim 1 to 7；And

Endoscope.