CN102429621A

CN102429621A - Electronic endoscope system, processor device for the same and image pickup control method in the same

Info

Publication number: CN102429621A
Application number: CN2011102483281A
Authority: CN
Inventors: 山口博司
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2010-08-30
Filing date: 2011-08-26
Publication date: 2012-05-02
Anticipated expiration: 2031-08-26
Also published as: CN102429621B; JP2012045265A; JP5467971B2

Abstract

The invention provides an electronic endoscope system and a camera control method thereof, and a processor device. Under the close-range observation mode, a first blue narrow-band-domain light (Bn1) is irradiated in a cavity, while articles in the cavity are shot at the same time through a camera element. The exposure is detected based on the camera signal read out by the camera element. Based on the detected exposure read out by the camera element, when the exposure is smaller than a constant value, the close-range observation mode is switched into the long-range observation mode. Under the long-range observation mode, a second blue narrow-band-domain light (Bn2) is irradiated in the cavity. Compared with the first blue narrow-band-domain light (Bn1), the second blue narrow-band-domain light (Bn2) is greater in half-value width. Therefore, the amount of light is prevented from being insufficient during the long-range observation.

Description

Electronic endoscope system and camera shooting control method thereof and processor device

Technical field

The present invention relates to have electronic endoscope system and the camera shooting control method and the processor device of the special light overview function of stressing demonstration top layer blood vessel.

Background technology

At medical field in recent years, use the diagnosis of fujinon electronic video endoscope and treatment to popularize.Fujinon electronic video endoscope possesses the endoceliac elongated insertion section of inserting the examinee, and is built-in with imaging apparatuss such as CCD at the leading section of this insertion section.In addition, on fujinon electronic video endoscope, be connected with light supply apparatus and processor device.Shine to endoceliac look-out station from the illumination light of light supply apparatus illuminating window from the leading section of being located at fujinon electronic video endoscope.From the camera window of the reflected light of the look-out station leading section through being located at fujinon electronic video endoscope to CCD incident.The image of being taken by this CCD is admitted to processor device, after being processed circuit and having implemented various Flame Image Process, shows at monitor.Therefore, through using fujinon electronic video endoscope, therefore endoceliac image that can the real-time confirmation examinee, can be diagnosed and treated aptly.

Light supply apparatus use can send from the blue ribbon territory (blue wavelength territory) to the red zone territory white light source, the for example xenon lamp of the wide band light of the white in (red wavelength territory).Through using white wide band light as illumination light, can comprehensive observing irradiated body tissue (objective tissue).Can roughly observe the irradiated body tissue from the photographed images that the irradiation wide band light time obtains, but the irradiated body tissues such as sag and swell of capillary vessel, pit pattern (gland outlet structure), depression or protuberance and so on are difficult to observe clearly.

As known,, can capillary vessel etc. be observed emphatically clearly through wavelength being limited in territory, the arrowband light in specific band territory for this irradiated body irradiated tissue.On the other hand, because to the half breadth constriction of the light of irradiated body irradiated tissue, so the light quantity of illumination light reduces.Consequently, endoceliac illumination is insufficient, can not carry out good shooting.

In No. 4009626 communique of japanese, implement to be used for the Flame Image Process of deficiency in light quantity compensation for resulting image pickup signal of irradiation territory, arrowband light time.Thus, even the irradiation of light and making under the situation dark in the body cavity in the territory, arrowband, the image quality of the reflection that is shown by monitor can not reduce yet.

But as known, even under the situation of irradiation territory, arrowband light, when forward end section of endoscope is observed near the irradiated body tissue, when so-called close shot is observed, the light quantity of territory, arrowband light also can be sufficient, can fully stress top layer blood vessel etc.Relative with it, when making endoscope distal end portion carry out the distant view observation away from the irradiated body tissue, when so-called distant view is observed, because the deficiency in light quantity of territory, arrowband light, so can not fully stress top layer blood vessel etc. sometimes.

For this opinion, do not put down in writing or hint in No. 4009626 communique of japanese, therefore, no matter distant view is observed still is arbitrary situation that close shot is observed, and all image pickup signal is used for the Flame Image Process of deficiency in light quantity compensation.Therefore, when the distant view that becomes deficiency in light quantity was observed, the Flame Image Process of putting down in writing in No. 4009626 communique of japanese that is used for the deficiency in light quantity compensation was useful.But when close shot was observed, more abundant stressing showed top layer blood vessel etc., and it is bright more, and therefore, when being used for the Flame Image Process of deficiency in light quantity compensation, the reflection on the monitor is too bright, and the anxiety that is difficult on the contrary observe exists.

Summary of the invention

The objective of the invention is to, carry out also can obtaining enough bright reflection under the situation of distant view observation even shine special plain edge on the limit.

For realizing above-mentioned purpose, other purpose, the present invention possesses the light irradiation device that shines in the body cavity, imaging apparatus, observation state decision maker, video camera controller.Said this light irradiation device optionally produces: in the blue ribbon territory, be restricted to the first blue arrowband territory light in specific band territory and make than the centre wavelength of this territory, first blue arrowband light and more lean on the light quantity of long wavelength side not increase and territory, second blue arrowband light that the light quantity of short wavelength side is increased.Said imaging apparatus is configured in the endoscope distal end portion that in body cavity, inserts, and image pickup signal is taken and produced to said endoceliac irradiated body tissue.Said observation state decision maker based on said image pickup signal whether judge distance at said endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue.Said video camera controller is controlled said imaging apparatus, thus, and when being judged to be said close shot observation state, to taking by the said irradiated body tissue of territory, said first blue arrowband optical illumination; When being judged to be said distant view observation state, to taking by the said irradiated body tissue of territory, said second blue arrowband optical illumination.

Preferably, said light irradiation device further optionally is created in territory, the second green arrowband light that is restricted to the first green arrowband territory light in specific band territory in the green band territory and the half breadth of this territory, first green arrowband light is expanded within the specific limits.Under this situation, when being judged to be said close shot observation state, further take the said irradiated body tissue that is thrown light on by territory, said first green arrowband light; When being judged to be said distant view observation state, further take the said irradiated body tissue that is thrown light on by territory, said second green arrowband light.

Preferably, territory, said second blue arrowband light has following characteristic,, is more leaning on long wavelength side than near the centre wavelength the 460nm that is, and light quantity sharply reduces; At short wavelength side, light quantity reduces gradually between 400nm～460nm, and light quantity sharply reduces when being lower than 400nm.The centre wavelength of preferred territory, said second green arrowband light is 550nm, and half breadth is 20nm～40nm.

Preferably, said light irradiation device comprises: optionally produce the blue-light source of the said first blue arrowband territory light and territory, said second blue arrowband light and optionally produce the said first green arrowband territory light and the green light source of territory, said second green arrowband light.

Preferably, said blue-light source or said green light source can be regulated the half breadth of the said second blue arrowband territory light or territory, said second green arrowband light in certain limit.According to the regulated quantity of this half breadth, to showing that by said image pickup signal generation monitor the signal processing of the view data of usefulness changes.

Preferably; Said blue-light source or said green light source are certain mode according to the ratio at brightness ratio Lb/Lg under the said close shot observation state and the brightness ratio Lbr/Lgt when said distant view is observed, and regulate the half breadth of the said second blue arrowband territory light or territory, said second green arrowband light.Following at this each symbol, Lb: organize the resulting first blue image pickup signal in the irradiation of territory, said first blue arrowband light, taking said irradiated body under the said close shot observation state by said imaging apparatus.Lg: organize the resulting first green image pickup signal in the irradiation of territory, said first green arrowband light, taking said irradiated body under the said close shot observation state by said imaging apparatus.Lb ': organize the resulting second blue image pickup signal in the irradiation of territory, said second blue arrowband light, taking said irradiated body under the said distant view observation state by said imaging apparatus.Lg ': organize the resulting second green image pickup signal in the irradiation of territory, said second green arrowband light, taking said irradiated body under the said distant view observation state by said imaging apparatus.

Said light irradiation device comprises: send the wide band light source of the wide band light from the blue ribbon territory to the red zone territory and be used for taking out from said wide band light the rotary filter of specific territory, arrowband light.This rotary filter has territory, the first blue arrowband light transmission light filter that makes territory, said first blue arrowband light transmission, territory, the second blue arrowband light transmission light filter that makes territory, said second blue arrowband light transmission, territory, the first green arrowband light transmission light filter that makes territory, said first green arrowband light transmission, reaches territory, said second green arrowband light.

Preferably, said observation state decision maker detects light exposure according to said image pickup signal, is under the situation more than the certain value in detected light exposure, is judged to be said close shot observation state; Under the situation of not enough certain value, be judged to be said distant view observation state.

In other embodiment of electronic endoscope system, possess imaging apparatus, observation state decision maker, light irradiation device.Image pickup signal is taken and produced to said imaging apparatus to endoceliac irradiated body tissue.This imaging apparatus is configured in the endoscope distal end portion that in said body cavity, inserts.Said observation state decision maker is based on said image pickup signal, whether judge distance at said endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue.In the said light irradiation device, when being judged to be said close shot observation state, territory, the first blue arrowband light that will in the blue ribbon territory, be restricted to specific band territory is to said body cavity internal radiation; When being judged to be said distant view observation state, more leaning on the light quantity of long wavelength side not increase and only make territory, second blue arrowband light that the light quantity of short wavelength side increases to said body cavity internal radiation with making than the centre wavelength of territory, said first blue arrowband light.

In other embodiment again of electronic endoscope system, possess light irradiation device, observation state decision maker, imaging apparatus to shining in the body cavity.Said light irradiation device optionally is created in the first blue arrowband territory light that is restricted to specific band territory in the blue ribbon territory and makes than the centre wavelength of this territory, first blue arrowband light and more leans on the light quantity of long wavelength side not increase and territory, second blue arrowband light that the light quantity of short wavelength side is increased.It is whether near state is the close shot observation state, perhaps is that the distance of said endoscope distal end portion and said irradiated body tissue is that state far away is the distant view observation state that said observation state decision maker takes a decision as to whether the distance of inserting said endoceliac endoscope distal end portion and said endoceliac irradiated body tissue.Said imaging apparatus is configured in said endoscope distal end portion.This imaging apparatus is taken the said irradiated body tissue that under said close shot observation state, is thrown light on by territory, the first blue arrowband light that in the blue ribbon territory, is restricted to specific band territory; Shooting more leans on the light quantity of long wavelength side not increase and said irradiated body tissue that territory, second blue arrowband light that the light quantity of short wavelength side is increased is thrown light on by making than the centre wavelength of territory, said first blue arrowband light under said distant view observation state.

Processor device of the present invention possesses observation state decision maker and video camera controller, together uses with endoscope.This endoscope has following function; That is, will in the blue ribbon territory, be restricted to the first blue arrowband territory light in specific band territory and make than the centre wavelength of this territory, first blue arrowband light and more lean on the light quantity of long wavelength side not increase and function that territory, second blue arrowband light that the light quantity of short wavelength side increases is shone in to body cavity; With the function that produces said image pickup signal by taking the irradiated body tissue at the imaging apparatus that endoscope distal end portion disposed that in said body cavity, inserts.Said observation state decision maker based on said image pickup signal whether judge distance at said endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue.Said video camera controller is controlled said imaging apparatus, thus, and when being judged to be said close shot observation state, to taking by the said irradiated body tissue in the optical illumination of territory, the said first blue arrowband; When being judged to be said distant view observation state, to taking by the said irradiated body tissue of territory, said second blue arrowband optical illumination.

Camera shooting control method of the present invention is applicable to the electronic endoscope system that possesses endoscope and processor device.Said endoscope has the imaging apparatus that is disposed in the endoscope distal end portion that in body cavity, inserts, and is taken the irradiated body tissue and produced image pickup signal by this imaging apparatus.Said processor device carries out Flame Image Process to the image pickup signal from said endoscope.Said camera shooting control method has the observation state determination step and takes step.In the said observation state determination step; Based on said image pickup signal, whether judge distance at endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue.In the said shooting step, when being judged to be said close shot observation state, take the said irradiated body tissue that is thrown light on by territory, the first blue arrowband light that in the blue ribbon territory, is restricted to specific band territory through imaging apparatus; When being judged to be said distant view observation state, taking by making through said imaging apparatus and more to lean on the light quantity of long wavelength side not increase and said irradiated body tissue that territory, second blue arrowband light that the light quantity of short wavelength side is increased is thrown light on than the centre wavelength of territory, said first blue arrowband light.

According to the present invention, under the close shot observation state, use territory, first blue arrowband light; Under the distant view observation state; Use makes than the centre wavelength of territory, first blue arrowband light more leans on the light quantity of long wavelength side not increase and territory, second blue arrowband light that the light quantity of short wavelength side is increased; Therefore, even be the distant view observation state, also can obtain enough bright reflection.

Description of drawings

Fig. 1 is the skeleton diagram of the electronic endoscope system of first embodiment of the invention;

Fig. 2 is the block diagram of electronic endoscope system;

Fig. 3 is the skeleton diagram of rotary filter;

Fig. 4 is that the employed blue light of the rotary filter of presentation graphs 3 sees through light filter, green light filter, the red chart that sees through the spectral transmission of light filter of seeing through;

Fig. 5 A is the chart of the spectral transmission of the rotary filter of presentation graphs 3 employed first blue arrowband territory light transmission light filter and territory, first green arrowband light transmission light filter;

Fig. 5 B is the chart of the spectral transmission of the rotary filter of presentation graphs 3 employed second blue arrowband territory light transmission light filter and territory, second green arrowband light transmission light filter;

Fig. 6 A is the chart of the absorptance of the light in the expression blood vessel;

Fig. 6 B is the chart that the scattering of light coefficient in the soma is given birth in expression;

Fig. 7 A is the key diagram of the shooting control of the CCD when being illustrated in the normal light observation;

Fig. 7 B is the key diagram of the shooting control of the CCD of (close shot) when being illustrated in the special light observation;

Fig. 7 C is the key diagram of the shooting control of the CCD of (distant view) when being illustrated in the special light observation;

Fig. 8 be when special light is observed (close shot) in the image graph of the special light image that monitor showed;

Fig. 9 be when special light is observed (distant view) in the image graph of the special light image that monitor showed;

Figure 10 is the flow chart of the effect of expression first embodiment;

Figure 11 is the block diagram of the electronic endoscope system of second embodiment of the invention;

Figure 12 is the skeleton diagram of normal light with rotary filter;

Figure 13 is the skeleton diagram of special light with rotary filter;

Figure 14 A is the key diagram of the shooting control of the CCD when being illustrated in the normal light observation;

Figure 14 B is the key diagram of the shooting control of the CCD of (close shot) when being illustrated in the special light observation;

Figure 14 C is the key diagram of the shooting control of the CCD of (distant view) when being illustrated in the special light observation;

Figure 15 is the block diagram of the electronic endoscope system of third embodiment of the invention;

Figure 16 is the key diagram that the half breadth of expression second blue arrowband territory light Bn2 and second green arrowband territory light Gn2 can be regulated in certain limit;

Figure 17 A is the key diagram of the shooting control of the CCD when being illustrated in the normal light observation;

Figure 17 B is the key diagram of the shooting control of the CCD of (close shot) when being illustrated in the special light observation;

Figure 17 C is the key diagram of the shooting control of the CCD of (distant view) when being illustrated in the special light observation;

Figure 18 key diagram that to be expression carry out the shooting control under the situation that distant view observes by the illumination light of the half breadth of only having widened territory, green arrowband light.

The specific embodiment

As shown in Figure 1, the electronic endoscope system 10 of first embodiment of the invention possesses: the endoceliac fujinon electronic video endoscope 11 of taking the examinee; Generate endoceliac treatment of picture apparatus 12 based on the signal that obtains by shooting; Supply is to the light supply apparatus 13 of the illumination light of shining in the body cavity; The monitor 14 that shows endoceliac image.

Above-mentioned electronic endoscope system 10 has normal light image model and these two observing patterns of special light image model.In the normal light image model, through by wide band light such as white lights to throwing light in the body cavity, obtain the image of the nature of irradiated body tissue, can carry out comprehensive observation to the irradiated body tissue.In the special light image model, through by territory, arrowband light to throwing light in the body cavity, obtain the image that stress to show top layer blood vessel etc.In this special light image model, the close shot observing pattern of observing under the approaching close shot state of the leading section 16a that exists at fujinon electronic video endoscope 11 and the distance of irradiated body tissue and with the distant view state of the distance of irradiated body tissue under the distant view observing pattern of observing.

Fujinon electronic video endoscope 11 possesses: insert endoceliac flexual insertion section 16, be located at the cardinal extremity part of insertion section 16 operating portion 17, be used for general flexible cord 18 that operating portion 17 is connected with processor device 12 and light supply apparatus 13.16 front is formed with the bend 19 that a plurality of crooked blocks (coltfoal) are linked in the insertion section.Bending section 19 carries out flexure operation through the dihedral knob 21 of operating operation portion in direction up and down.Front end at bending section 19 is connected with leading section 16a, through the flexure operation of bending section 19, and makes leading section 16a towards desirable direction.16a has taken in well-known camera system, illuminator etc. at this leading section.

On general flexible cord 18, adapter 24 is installed at processor device 12 and light supply apparatus 13 sides.Adapter 24 is for having communication with adapter and the light source compound adapter with adapter.Via this adapter 24, fujinon electronic video endoscope 11 is connected with processor device 12 and light supply apparatus 13 dismounting freely.

As shown in Figure 2, light supply apparatus 13 possesses wide band light source 30, rotary filter 31, light filter switching part 32.As wide band light source 30, use xenon lamp, White LED, micro white light source etc., produce from the blue ribbon territory (about 470～700nm) wide band light BB to the red zone territory.Wide band light source 30 continues to light in the use of fujinon electronic video endoscope 11.The wide band light BB that sends from wide band light source 30 incides collecting lens 34 through rotary filter 31.By the wide band light BB of collecting lens 34 optically focused to photoconduction 35 incidents.

Rotary filter 31 is that the center rotates by certain speed through motor 36 with rotating shaft 31a.This rotary filter 31 possesses first filter areas 38 and second filter areas 39.In this example, first filter areas, 38 to the second filter areas 39 are provided with more in the inner part.First filter areas 38 sees through the illumination light when being used for the normal light image model among the wide band light BB from wide band light source 30.Second filter areas 39 sees through the illumination light when being used for the special light image model among the wide band light BB.Light filter switching part 32 is installed on the rotating shaft 31a of rotary filter 31; Make when making when the normal light image model first filter areas 38 be positioned on the light path of wide band light source 30, at the special light image model second filter areas 39 be positioned at the mode on the light path of wide band light source 30, direction moves in the footpath to make rotary filter 31.

Fujinon electronic video endoscope 11 possesses photoconduction 35, CCD44, analog processing circuit (AFE:Analog Front End) 45, imaging control part 46.Photoconduction 35 is heavy caliber optical fiber, fibre bundle etc., and the incident end is inserted light supply apparatus 13, with ejecting end and irradiation lens 48 opposites of being located at leading section 16a.From the illumination light of light supply apparatus 13 by photoconduction 43 leaded lights after, penetrate to irradiation lens 48.Incide the illumination light of irradiation lens 48, the illuminating window 49 of the end face through being installed on leading section 16a is to the body cavity internal radiation.Observation window 50 at the reflected light of the body cavity internal reflection end face through being installed on leading section 16a incides collecting lens 51.

In this embodiment, use CCD44 as imaging apparatus.This CCD is the black-white CCD with spectral sensitivity of regulation, and the reflected light that has passed through collecting lens 51 is received by shooting face 44a.In shooting face 44a two-dimensional arrangement a plurality of well-known pixels are arranged, each pixel is carried out opto-electronic conversion with the reflected light that receives, and accumulates the signal charge that is produced.

Imaging control part 46 is connected with processor device 12 interior controllers 59, under the control of controller 59, sends the driving signal to CCD44.CCD44 is driven based on driving signal, and the signal charge that each pixel is accumulated is read by time series ground, and its image pickup signal as the frame rate of stipulating is sent to AFE45.

As everyone knows, above-mentioned AFE45 by correlated double sample circuit (CDS), automatic gain control circuit (AGC), and analog/digital converter (A/D) (all not shown) constitute.CDS implements the correlated double sampling processing to the image pickup signal from CCD44, removes the noise contribution in the image pickup signal.AGC is so that the mode that image pickup signal converges in the desirable dynamic range will be from the image pickup signal amplification of CDS.A/D will convert digital form into from the image pickup signal of AGC, and deliver to processor device 12 as the image pickup signal of specified bit number.

Processor device 12 possesses Digital Signal Processing portion (DSP:Digital Signal Processor) 55, frame memory 56, observation state detection unit 57, display control circuit 58, controller 59.59 pairs of each several parts of controller are controlled.DSP55 carries out signal processing such as white balance adjustment, tone processing, gray scale processing, definition processing to the image pickup signal from the AFE45 of fujinon electronic video endoscope.In addition, therefore frame memory 56, observation state detection unit 57, display control circuit 58 are elaborated after rotary filter 31 owing to relevant with the kind of illumination light.

As shown in Figure 3; In first filter areas 38, be provided with along Zhou Fangxiang in order: the red light that the green light that the blue light that the illumination light (B light) in wide band light BB medium blue colour band territory is seen through sees through light filter 40, see through the illumination light (G light) in wide band light BB medium green colour band territory sees through light filter 41, see through the illumination light (R light) in red zone territory among the wide band light BB sees through light filter 42.Therefore, through the rotation of rotary filter 31, penetrate B light, G light, R light successively from rotary filter 31.The B light, G light, the R light that penetrate successively from rotary filter 31 are known as face order light.

At this, as shown in Figure 4, blue light sees through light filter 40 and has the spectral transmission shown in the curve B, and green light sees through light filter 41 and has the spectral transmission shown in the curve G, and red light sees through light filter 42 and has the spectral transmission shown in the curve R.In addition, the short wavelength side of the long wavelength side of curve B and curve G overlaps a part, and in addition, the short wavelength side of the long wavelength side of curve G and curve R overlaps a part, therefore, in the coloured light of selecting, mixes adjacent coloured light a little.

On second filter areas 39, be provided with along Zhou Fangxiang in order: make territory, the first blue arrowband light transmission light filter 65 that the first blue arrowband territory light Bn1 when being used for the close shot observing pattern among the wide band light BB sees through, territory, the second blue arrowband light transmission light filter 66 that the second blue arrowband territory light Bn2 when making wide band light BB be used for the distant view observing pattern sees through, territory, the first green arrowband light transmission light filter 67 that the first green arrowband territory light Gn1 when making wide band light BB be used for the close shot observing pattern sees through, territory, the second green arrowband light transmission light filter 68 that the second green arrowband territory light Gn2 when making wide band light BB be used for the distant view observing pattern sees through.

The spectral transmission of territory, first blue arrowband light transmission light filter 65 has the distribution shown in the curve B n1 of Fig. 5 A; Therefore, near the roughly 450nm of the first blue arrowband of body cavity internal radiation territory light Bn1 in centre wavelength, light quantity reaches peak value; More leaning on long wavelength side than 450nm; Light quantity sharply descends, and between 450nm and 500nm, light quantity is roughly " 0 ".On the other hand, than 450nm short wavelength side more, though do not reduce so not sharply in the light quantity of long wavelength side, light quantity descends to 400nm from 450nm, and at the position lower than 400nm, light quantity is " 0 ".

Relative with it; The spectral transmission of territory, second blue arrowband light transmission light filter 66 has the distribution shown in the curve B n2 of Fig. 5 B; Therefore, to the second blue arrowband of body cavity internal radiation territory light Bn2, with first blue arrowband territory light Bn1 likewise; Roughly 450nm in the centre wavelength that reaches peak value than light quantity more leans on long wavelength side, and light quantity sharply reduces.On the other hand, than the short wavelength side more of 450nm roughly, territory light Bn1 is different with the first blue arrowband, is keeping between 450nm～400nm under the state of higher light quantity, and light quantity little by little reduces slowly.And near 400nm, light quantity begins rapid reduction, and at the position lower than 400nm, light quantity is " 0 ".Therefore, among the second blue arrowband territory light Bn2, though the i.e. roughly not change of the light quantity of the long wavelength side of 450nm of the centre wavelength among the first blue arrowband territory light Bn1, the light quantity of short wavelength side increases.

Adopt light quantity distribution as above to be based on following reason first blue arrowband territory light Bn1 and second blue arrowband territory light Bn2.Shown in the distribution of the specific absorbance of Fig. 6 A, the top layer blood vessel of light in giving birth to soma that is lower than near the wavelength the 450nm receives extremely strong absorption, and blood vessel is absorbed hardly and directly sees through on the top layer but surpass near the 450nm light.In addition, can know like the distribution of the scattering coefficient of Fig. 6 B, the short light of wavelength, the scattering in giving birth to soma is strong more.According to the optical absorption characteristics of these blood vessels and relevant opinion and other opinion of light scattering characteristic of giving birth to soma; If the illumination light wavelength surpasses near the 470nm, then the absorption characteristic because of strong light makes the illumination light of being shone can turn back to the leading section 16a of fujinon electronic video endoscope hardly in the blood vessel of top layer.But, in the living soma that surrounds the top layer blood vessel, make a large amount of illumination light reflections of being shone through stronger scattering properties, turn back to the leading section 16a of fujinon electronic video endoscope thus.Therefore, the top layer blood vessel is high with the contrast (contrast) of its living soma on every side, can fully stress expression top layer blood vessel etc.

Be fully to stress to show top layer blood vessel etc., when when close shot is observed, observing during arbitrary observation,, need shine and do not contain illumination light above near the light of the wavelength domain the 470nm about first blue arrowband territory light Bn1 and second blue arrowband territory light Bn2 with distant view.At this, when the distant view of deficiency in light quantity is observed, use with respect to first blue arrowband territory light Bn1 and near than 470nm short wavelength side second blue arrowband territory light Bn2 that light quantity has been increased more.

On the other hand, the spectral transmission of territory, first green arrowband light transmission light filter 67 has the distribution shown in the curve Gn1 of Fig. 5 A, and therefore, near centre wavelength was 550nm, half breadth was 10nm～20nm to the first green arrowband of body cavity internal radiation territory light Gn1.Relative with it; The spectral transmission of territory, second green arrowband light transmission light filter 68 has the distribution shown in the curve Gn2 of Fig. 5 B, therefore, and to the second green arrowband of body cavity internal radiation territory light Gn2; With first green arrowband territory light Gn1 likewise; Centre wavelength is 550nm, but its half breadth is different with first green arrowband territory light Gn1, is 20～40nm.That is the half breadth of second green arrowband territory light Gn2 wide than first green arrowband territory light Gn1.Therefore, among the second green arrowband territory light Gn2, territory light Gn1 compares with the first green arrowband, and light quantity has more the amount that half breadth is widened.

First green arrowband territory light Gn1 and second green arrowband territory light Gn2 are made as the reasons are as follows of above-mentioned light quantity distribution.Shown in the distribution of the specific absorbance of Fig. 6 A, about surpassing near the light the 450nm, the pairing optical absorption characteristics of blood vessel reduces, but between 500nm～600nm, particularly near 530nm～570nm, blood vessel pairing optical absorption characteristics in middle level improves.And about surpassing the light of 600nm, absorption characteristic reduces once more.In addition, shown in the distribution of the scattering coefficient of Fig. 6 B, wavelength is long more, and scattering coefficient reduces more gradually, but between 500nm～600nm, gives birth to the almost not variation of scattering properties in the soma.

Therefore; According to about the optical absorption characteristics of these blood vessels with give birth to opinion and other opinion of the light scattering characteristic of soma; In light wavelength be between 500nm～600nm, particularly near 530nm～570nm; The variation of scattering properties of living soma that comprises the middle level blood vessel is little, therefore, roughly certain by the light quantity of the light of giving birth to soma's reflection and return electron forward end section of endoscope 16a.Relative with it; The middle level blood vessel that comprises in this life soma is with respect between 500nm～600nm, particularly near the light 530nm～570nm shows higher optical absorption characteristics; Therefore, the ratio of light that in the light of middle level blood vessel irradiation, turns back to the leading section 16a of fujinon electronic video endoscope reduces.Therefore, light wavelength is under between 500um～600nm, particularly near 530nm～570nm, and the middle level blood vessel improves with the contrast of livings soma around it, therefore, can fully stress demonstration middle level blood vessel etc.

Be fully to stress to show middle level blood vessel etc., when close shot is observed during with the distant view observation during arbitrary observation, all need light wavelength band territory between 500nm～600nm, preferred 530nm～570nm.If between 500nm～600nm, be preferably in the scope of 530nm～570nm; Then can fully stress to show middle level blood vessel etc.; Therefore; When the distant view of deficiency in light quantity is observed, use second green arrowband territory light Gn2, it increases light quantity through centre wavelength is further widened for the half breadth of the first green arrowband territory light Gn1 of 550nm roughly.

Under the situation of normal light image model; Utilizing rotary filter 31 with B light (between 1/3 rotation of rotary filter 31) between look-out station shines; Shown in Fig. 7 A; B light is carried out opto-electronic conversion and accumulates the step of signal charge and step that the signal charge that will accumulate is read as blue image pickup signal, alternately repeated with cycle of regulation.

Secondly; Switching to illumination light under the situation of G light from B light through the rotation of rotary filter 31; Between 1/3 rotation of rotary filter 31, with G light carry out opto-electronic conversion and accumulate the step of signal charge and step that the signal charge that will accumulate is read as green image pickup signal by alternately repetition.

Equally, utilizing rotary filter 31 that illumination light is switched to from G light under the situation of R light, between 1/3 rotation of rotary filter 31, R light is being carried out the step of opto-electronic conversion and replaced repetition as the step that red image pickup signal is read.

Relative with it; When the special light image model; Under the situation of the state that is in the close shot observation; Shown in Fig. 7 B, selecting between the first blue arrowband territory light Bn1 by rotary filter 31, be between 1/4 rotation of rotary filter 31, first blue arrowband territory light Bn1 is carried out opto-electronic conversion and accumulates the step of signal charge and step that this signal charge is read as territory, first blue arrowband image pickup signal was alternately repeated by the cycle with regulation.Through the rotation of rotary filter 31 from the first blue arrowband when territory light Bn1 switches to second blue arrowband territory light Bn2; Shining between this second blue arrowband territory light Bn2, being between 1/4 rotation of rotary filter 31, do not carry out accumulating of signal charge and reading of image pickup signal.

If rotary filter 31 is further rotated, then territory light Bn2 switches to first green arrowband territory light Gn1 from the second blue arrowband.Shining between this first green arrowband territory light Gn1, be between 1/4 rotation of rotary filter 31, first green arrowband territory light Gn1 is carried out opto-electronic conversion and accumulates the step of signal charge and the alternately repetition of step quilt that this signal charge is read as territory, first green arrowband image pickup signal.Secondly, through the rotation of rotary filter 31, territory light Gn1 switches to second green arrowband territory light Gn2 from the first green arrowband.Shining between this second green arrowband territory light Gn2, being between 1/4 rotation of rotary filter 31, do not carry out accumulating of signal charge and reading of image pickup signal.

In addition; When the special light image model, under the situation of the state that is in the distant view observation, shown in Fig. 7 C; Taking out between the first blue arrowband territory light Bn1 from rotary filter 31, being between 1/4 rotation of rotary filter 31, do not carry out accumulating of signal charge and reading of image pickup signal.When rotary filter 31 was further rotated, territory light Bn1 switched to second blue arrowband territory light Bn2 from the first blue arrowband.Between irradiation this second blue arrowband territory light Bn2, be between 1/4 rotation of rotary filter 31, second blue arrowband territory light Bn2 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge is read as territory, second blue arrowband image pickup signal was repeated by the cycle with regulation.

Secondly, territory light Bn1 switches to first green arrowband territory light Gn1 from the first blue arrowband.Shining between this first green arrowband territory light Gn1, being between 1/4 rotation of rotary filter 31, do not carry out accumulating of signal charge and reading of image pickup signal.Through the rotation of rotary filter 31, territory light Gn1 switches to second green arrowband territory light Gn2 from the first green arrowband.Between the irradiation second green arrowband territory light Gn2, be between 1/4 rotation of rotary filter 31, second green arrowband territory light Gn2 is carried out opto-electronic conversion and accumulates the step of signal charge and step that this signal charge is read as territory, second green arrowband image pickup signal is repeated.

Under the situation that is set at the normal light image model; DSP55 carries out signal processing such as white balance adjustment, tone processing, gray scale processing, definition processing to blue image pickup signal, green image pickup signal, the red image pickup signal from AFE45 output, generates the normal light view data.Resulting normal light view data is stored in frame memory 56.

On the other hand, be set under the special light image model under the situation of close shot observing pattern, to implementing above-mentioned signal processing respectively from the first blue arrowband territory image pickup signal and territory, the first green arrowband image pickup signal of AFE45 output.Each image pickup signal of having implemented signal processing is used as close shot and is stored in frame memory 56 with the special light view data.In addition; Be set under the special light image model under the situation of distant view observing pattern; With the close shot observing pattern likewise; The second blue arrowband territory image pickup signal and territory, second green arrowband image pickup signal after being implemented above-mentioned signal processing, are stored in frame memory 56 as distant view with the special light view data respectively.

Observation state detection unit 57 detects light exposure with special light view data and distant view with arbitrary view data the special light view data from the close shot that is stored in frame memory 56.In detected light exposure is under the situation more than the certain value, is judged to be current point and is in the close shot observation state.Under the situation that is judged to be the close shot observation state, be automatically made the close shot observing pattern.If be set at the close shot observing pattern, the mode of the first blue arrowband territory image pickup signal and territory, first green arrowband image pickup signal that obtains when then taking with next time for imaging control part 46 is sent indication (with reference to Fig. 7 B).

On the other hand, under the situation that detects the not enough certain value of light exposure, be judged to be current point and be in the distant view observation state.Be judged to be under the situation that is in the distant view observation state, be automatically made the distant view observing pattern.After being set at the distant view observing pattern, send indication (with reference to Fig. 7 C) with the mode that when taking next time, obtains the second blue arrowband territory image pickup signal and territory, second green arrowband image pickup signal for imaging control part 46.

Display control circuit 58 is read the normal light view data from frame memory 56 under the situation that is in the normal light image model, and on monitor 14, shows the normal light image based on the normal light view data of reading.In addition, in the special light image model, place under the situation of close shot observing pattern, read close shot from frame memory 56 and use the special light view data.And, use the special light view data based on the close shot of reading, on monitor 14, show the special light image when close shot shown in Figure 8 is observed.

In addition, in the special light image model, place under the situation of distant view observing pattern, read distant view from frame memory 56 and use the special light view data.And, the special light image when showing that with the special light view data distant view shown in Figure 9 is observed on monitor 14 based on the distant view of reading.Among the present invention, the deficiency in light quantity when observing through making half breadth broadening to the illumination light of body cavity internal radiation compensate distant view.At this moment, owing to, do not bring influence so can not observe to the special light of emphasical demonstrations such as top layer blood vessel seeing that the scattering properties of the optical absorption characteristics of blood vessel and its circumvascular living soma makes half breadth broadening.

Secondly, the effect to first embodiment describes with reference to the flow chart of Figure 10.At first, switch SW50, switch to the special light image model from the normal light image model through the operation image model.In the special light image model, be set at the close shot observing pattern in setting in the early stage.Light filter switching part 131 is according to the switching to the special light image model, and second filter areas 39 of rotary filter 31 is placed on the light path of wide band light source 30.Through under this state, making rotary filter 31 rotation, with first blue arrowband territory light Bn1, second blue arrowband territory light Bn2, first green arrowband territory light Gn1, and second green arrowband territory light Gn2 (being special light) successively to endoceliac look-out station irradiation.In addition, in the special light image model, yet can initial setting be made as the close shot observing pattern and be made as the distant view observing pattern.

And imaging control part 46 is according to only territory light Bn1 and first green arrowband territory light Gn1 indicate from the mode that CCD44 reads image pickup signal when look-out station shines in the first blue arrowband.Thus, obtain the first blue arrowband territory image pickup signal and territory, first green arrowband image pickup signal.The resulting first blue arrowband territory image pickup signal and territory, first green arrowband image pickup signal are stored in frame memory 56 as close shot with the special light view data after being implemented signal processing such as white balance adjustment, tone processing, gray scale processing, definition processing through DSP55.And, use the special light view data based on the close shot of reading from frame memory 56, on monitor 14, show the special light image when close shot shown in Figure 8 is observed.

In addition, observation state detection unit 57 detects light exposure according to the close shot that is stored in frame memory 56 with the special light view data.And, be under the situation more than the certain value in light exposure, the observation state that is judged to be current point is the close shot observation state, former state keeps the close shot observing pattern.On the other hand, under the situation of the not enough certain value of light exposure, judge that the observation state of current point is the distant view observation state.If be judged to be the distant view observation state, then switch to the distant view observing pattern from the close shot observing pattern.

According to the switching to the distant view observing pattern, imaging control part 46 is only indicate second blue arrowband territory light Bn2 and second green arrowband territory light GI12 from the mode that CCD44 reads image pickup signal when look-out station shines.Thus, obtain the second blue arrowband territory image pickup signal and territory, second green arrowband image pickup signal.Territory, resulting second blue arrowband image pickup signal and territory, second green arrowband image pickup signal behind the identical signal processing, are stored in frame memory 56 as distant view with the special light view data through DSP55 when having implemented with the close shot observing pattern.And, use the special light view data based on the distant view of reading from frame memory 56, on monitor 14, show the special light image when distant view shown in Figure 9 is observed.

When the distant view observing pattern, likewise, utilize the observation state detection unit to carry out the judgement of observation state during also with the close shot observing pattern.Therefore, be certain value when above in light exposure, switch to the close shot observing pattern from the distant view observing pattern.On the other hand, when the not enough certain value of light exposure (the not enough certain value of light exposure but can fully stress to show top layer blood vessel etc. time), as long as set the special light image model, just can former state continuation distant view observing pattern.

Secondly, with reference to Figure 11 second embodiment of the present invention is described.In this second embodiment, electronic endoscope system 100 uses two rotary filters and sends face order light or the special light of RGB.In addition, only different portion's material in first embodiment and second embodiment is described, and for common component omission explanation.

In light supply apparatus 13, be provided with normal light with rotary filter 101 and special light with rotary filter 102.Normal light passes through motor 103,104 with rotating shaft 101a with rotary filter 101 and special light with

rotary filter

102, and 102a is that the center rotates by certain speed.

Shown in figure 12; Normal light with rotary filter 101 on, be provided with along Zhou Fangxiang in order: the peristome 113 that the red light that the green light that the blue light that the light (B light) in wide band light BB medium blue colour band territory is seen through sees through light filter 110, see through the light (G light) in wide band light BB medium green colour band territory sees through light filter 111, see through the light (R light) in red zone territory among the wide band light BB sees through light filter 112, wide band light BB is directly seen through.Normal light is with in the rotary filter 101, and blue light sees through light filter 110, green light sees through light filter 112, reaches on the light path of any entering wide band light source 30 in the peristome 113 through light filter 111, red light.

On the other hand; Shown in figure 13, be provided with along Zhou Fangxiang in order at special light: territory, the second green arrowband light transmission light filter 118 that territory, the first green arrowband light transmission light filter 117 that territory, the second blue arrowband light transmission light filter ll6 that make territory, first blue arrowband light transmission light filter 115 that the first blue arrowband territory light Bn1 when being used for close shot among the wide band light BB and observing sees through, the second blue arrowband territory light Bn2 when making wide band light BB be used for distant view to observe sees through, the first green arrowband territory light Gn1 when making wide band light BB be used for close shot to observe see through, the second green arrowband territory light Gn2 when making wide band light BB be used for distant view to observe see through with rotary filter 102.

Be provided with the light filter switching part 120 that rotating shaft 102a is moved in the orthogonal direction of light path with wide band light BB at special light on rotary filter 102.Through this light filter switching part 120, special light with rotary filter 102 make territory, light transmission light filter 116, the first green arrowband, territory, light transmission light filter 115, the second blue arrowband, territory, first blue arrowband light transmission light filter 117, and territory, second green arrowband light transmission light filter 118 in any light filter at the on position on the light path of wide band light source 30 with make between the retreating position that rotary filter integral body keeps out of the way from the light path of wide band light BB and move freely.

In second embodiment, under the situation that is set at the normal light image model, special light places retreating position with rotary filter 102.Therefore, the wide band light BB from wide band light source 30 directly shines with rotary filter 101 to normal light.Under this state, through making normal light, with B light, G light, R light, wide band light BB irradiation body intracavity in order with rotary filter 101 rotation.

In second embodiment, owing to be provided with the peristome 113 of special light on rotary filter 101, so not only with B light, G light, R light but also can be with wide band light BB to the body cavity internal radiation through usefulness at normal light.Therefore, shown in figure 14 when receiving endoceliac catoptrical CCD44 by imaging control part 46 control, identical in irradiation B light, G light, R light time with first embodiment, carry out accumulating and reading of signal; But when irradiation wide band light BB, do not carry out accumulating and reading of signal.

On the other hand, under the situation that is set at the special light image model, special light places on position with rotary filter 102.And, when normal light is positioned on the light path of wide band light BB with the peristome 113 of rotary filter 101, normal light is stopped with the rotation of rotary filter 101.Under this state, through making special light with rotary filter 102 rotation, with first blue arrowband territory light Bn1, second blue arrowband territory light Bn2, first green arrowband territory light Gn1, second green arrowband territory light Gn2 in order to shining in the body cavity.Under the special light image model,, therefore, omit the control of the CCD44 that relevant imaging control part 46 carries out to the kind and the order identical (with reference to Fig. 7 B, Fig. 7 C) of the illumination light of body cavity internal radiation.

Figure 15 representes the electronic endoscope system 200 of third embodiment of the invention.In the 3rd embodiment, use colored CCD as imaging apparatus, therefore, and can be with wide band light BB directly to the body cavity internal radiation, the shooting of carrying out 1 time just can obtain blue image pickup signal, green image pickup signal, red image pickup signal simultaneously.In addition, replace utilizing rotary filter to extract special light, and utilize light source such as LED directly to produce special light from wide band light BB.In addition, the part mark common symbol common with each above-mentioned embodiment omits its explanation.

In light supply apparatus 13, be provided with wide band light source 30, shutter 201, blue-light source 202, green light source 203, bonder 204, light source control portion 205.Shutter 201 is set between wide band light source 30 and the collecting lens 37, and keep out of the way in the light path of inserting wide band light BB and with wide band light BB light blocking on position with from position and allows wide band light BB between the retreating position of collecting lens 37 mobile freely.When being set at the normal light image model, shutter 201 places retreating position.On the other hand, when being set at the special light image model, shutter 201 places on position.The wide band light BB that penetrates from collecting lens 37 to wide band light with optical fiber 210 incidents.

As blue-light source 202, for example use LED (Light Emitting Diode), optionally produce first blue arrowband territory light Bn1 and these two kinds of blue lights of second blue arrowband territory light Bn2.These first blue arrowbands territory light Bn1 is the wavelength domain identical with above-mentioned embodiment with second blue arrowband territory light Bn2.In addition, blue-light source 202 half breadth that can make second blue arrowband territory light Bn2 enlarges or dwindles at scope Ra shown in Figure 16.The illumination light of sending by this blue-light source 202 to blue light with optical fiber 211 incidents.

Green light source 203 also is LED, optionally produces first green arrowband territory light Gn1 and these two kinds of green light of second green arrowband territory light Gn2.This green light source 203 is also identical with blue light light source 202, and the half breadth that can make second green arrowband territory light Gn2 enlarges or dwindles at scope Rb shown in Figure 16.The illumination light that produces by green light source 203 to green light with optical fiber 212 incidents.

In the 3rd embodiment; Owing to regulated the half breadth of second blue arrowband territory light Bn2 and second green arrowband territory light Gn2; So in the signal processing under DSP after obtaining image pickup signal (tone processing etc.), carry out different processing when need be when close shot is observed observing with distant view.But; If blue image pickup signal when the brightness ratio Lb/Lg between blue image pickup signal when observing according to close shot and green image pickup signal and distant view are observed and the ratio of brightness ratio the Lb '/Lg ' between green image pickup signal are the half breadth that certain mode is regulated second blue arrowband territory light Bn2 and second green arrowband territory light Gn2, carry out identical signal processing (tone processing etc.) when then can be when close shot is observed observing with distant view.At this, Lb representes the brightness value of territory, first blue arrowband image pickup signal, and Lg representes the brightness value of territory, first green arrowband image pickup signal, the brightness value of Lb ' expression territory, second blue arrowband image pickup signal, the brightness value of Lg ' expression territory, second green arrowband image pickup signal.About brightness ratio Lb/Lg, Lb '/Lg ', with processor device 12 that light source control portion 205 is connected in brightness ratio calculating part 215 calculate.

Bonder 204 with the photoconduction in the fujinon electronic video endoscope 35, wide band light with optical fiber 210, blue light with optical fiber 211, and green light with optical fiber 212 bindings.Thus, wide band light BB via wide band light with optical fiber 210 to photoconduction 35 incidents.In addition, first blue arrowband territory light Bn1 and second blue arrowband territory light Bn2 via blue light with optical fiber 211 to photoconduction 43 incidents.First green arrowband territory light Gn1 and second green arrowband territory light Gn2 via green light with optical fiber 212 to photoconduction 35 incidents.

Light source control portion 205 is connected with processor device 12 interior controllers 59, and based on the indication control blue-light source 202 and the green light source 203 that come self-controller 59.Under the situation that is set at the normal light image model, blue-light source 202 and green light light source 203 are OFF (extinguishing).Relative with it; Be set under the special light image model under the situation of close shot observing pattern; Make wide band light BB through shutter 201 under the state that endoceliac irradiation stops to the placement of on position; During the image pickup signal of obtaining 1 frame amount, from blue-light source 202 first blue arrowband territory light Bn1 takes place.Afterwards, in equally during the obtaining of 1 frame from green light source 203 generation first green arrowband territory light Gn1.In addition; Be set under the special light image model under the situation of distant view observing pattern; Stopping wide band light BB under the state of endoceliac irradiation with the close shot observing pattern identically, from blue-light source 202 second blue arrowband territory light Bn2 are taking place in during the obtaining of 1 frame.Afterwards, in during the obtaining of 1 frame from green light source 203 second green arrowband territory light Gn2 take place.

Colored CCD 220 receives the light from collecting lens 51 by shooting face 220a, the light that receives is carried out opto-electronic conversion and accumulates signal charge, and this signal charge is read as image pickup signal.Be arranged with R pixel, G pixel, these the three kinds of colour elements of B pixel that are provided with the color filter of arbitrary color in R color, G color, the B color at this shooting face 220a.Therefore, under the situation that has received wide band light BB by colored CCD 220, obtain red image pickup signal, obtain green image pickup signal, obtain blue image pickup signal from the B pixel from the G pixel from the R pixel.

In addition, under the situation that has received first blue arrowband territory light Bn1 or second blue arrowband territory light Bn2 by colored CCD 220, export the first blue arrowband territory image pickup signal or territory, second blue arrowband image pickup signal from the B pixel.In addition, under the situation that has received first green arrowband territory light Gn1 or second green arrowband territory light Gn2 by colored CCD 220, export the first green arrowband territory image pickup signal or territory, second green arrowband image pickup signal from the G pixel.

Imaging control part 46 is read image pickup signal through the shooting of control colored CCD 220 with the frame rate of regulation, and it is delivered to AFE45.Under the situation that is set at the normal light image model; Shown in Figure 17 A; During the obtaining of 1 frame, carry out wide band light BB is carried out opto-electronic conversion and accumulates the step of signal charge and the step that these signal charges are read as blue image pickup signal, green image pickup signal, red image pickup signal.This action is repeated to carry out with the cycle period of regulation when being set at the normal light image model.

Relative with it; In the special light image model, be set under the situation of close shot observing pattern; Shown in Figure 17 B; During the obtaining of 1 frame, carry out first blue arrowband territory light Bn1 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge is read as territory, first blue arrowband image pickup signal.Territory, first blue arrowband image pickup signal read end after; During the obtaining of next frame, carry out first green arrowband territory light Gn1 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge is read as territory, first green arrowband image pickup signal.These actions are repeated to carry out with the cycle period of regulation when being set at the close shot observing pattern.

In addition; Equally; In the special light image model, be set under the situation of distant view observing pattern; Shown in Figure 17 C, during the obtaining of 1 frame in, carry out second blue arrowband territory light Bn2 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge is read as territory, second blue arrowband image pickup signal.Territory, second blue arrowband image pickup signal read end after; During the obtaining of next frame, carry out second green arrowband territory light Gn2 is carried out opto-electronic conversion and accumulates the step of signal charge and the step that this signal charge is read as territory, second green arrowband image pickup signal.These actions are repeated to carry out with the cycle period of regulation when being set at the distant view observing pattern.

In above-mentioned first～the 3rd embodiment; Under the distant view observing pattern; Make the half breadth second blue arrowband territory light Bn2 bigger through use than first blue arrowband territory light Bn1; And make the half breadth second green arrowband territory light Gn2 bigger, eliminate deficiency in light quantity than first green arrowband territory light Gn1.But, under the almost absent variable situation of deficiency in light quantity, also can only increase among first blue arrowband territory light Bn1 and the first green arrowband territory light Gn1 half breadth of any.For example, in first embodiment, can when the distant view observing pattern, not increase half breadth yet, and directly continue to use first blue arrowband territory light Bn1, use the second green arrowband territory light Gn2 that has widened half breadth for green light for blue light.Under this situation; Shown in figure 18; In the control of the CCD that imaging control part is carried out; Only when having shone first blue arrowband territory light Bn1 and second green arrowband territory light Gn2, carry out accumulating and reading of signal, when irradiation second blue arrowband territory light Bn2 and first green arrowband territory light Gn1, do not carry out accumulating and reading of signal.

In addition; In above-mentioned first～the 3rd embodiment; Image pickup signal two sides during the light (first or second green arrowband territory light Gn1, Gn2) in image pickup signal when using the light (first or second blue arrowband territory light Bn1, Bn2) in irradiation blue ribbon territory and the green band of irradiation territory generate the special light image, but also can only use arbitrary side's generation special light image of light in light or the green band territory in blue ribbon territory.

In addition; In above-mentioned the 3rd embodiment; Blue-light source is provided with the function of the half breadth of fine adjustment light, and green light source also is provided with the function of the half breadth of fine adjustment light, but for example in signal processing such as white balance adjustment that the DSP by processor device carries out, tone processing, gray scale processing, definition processing; When close shot is observed and distant view implement respectively under the situation of signal processing when observing, can be not blue-light source and green light source be provided with the function of fine adjustment half breadth yet.

In the above-described embodiment; Through widening the half breadth of blue territory, arrowband light or green territory, arrowband light; Deficiency in light quantity when the compensation distant view is observed, but using territory, red arrowband light to carry out can also widening the half breadth of territory, red arrowband light under the situation of distant view observation on this basis.

In the above-described embodiment; When close shot is observed and distant view half breadth is changed when observing; But, make the half breadth variation (far away more with the distance of irradiated body distance, as to increase half breadth more) of territory, arrowband light according to the distance of endoscope distal end portion and irradiated body tissue preferably with its further vague generalization; Its distance is near more, reduces half breadth more.

Claims

1. electronic endoscope system, it comprises:

Light irradiation device; It is to shining in the body cavity, and this light irradiation device optionally is created in the first blue arrowband territory light that is restricted to specific band territory in the blue ribbon territory and does not make than the centre wavelength of this territory, first blue arrowband light and more leans on the light quantity of long wavelength side to increase and territory, second blue arrowband light that the light quantity of short wavelength side is increased;

Imaging apparatus, it takes and produces image pickup signal to said endoceliac irradiated body tissue, and this imaging apparatus is configured in the endoscope distal end portion that in said body cavity, inserts;

The observation state decision maker, its based on said image pickup signal whether judge distance at said endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue; And

Video camera controller, it controls said imaging apparatus, thus, when being judged to be said close shot observation state, to taking by the said irradiated body tissue of territory, said first blue arrowband optical illumination; When being judged to be said distant view observation state, to taking by the said irradiated body tissue of territory, said second blue arrowband optical illumination.

2. electronic endoscope system as claimed in claim 1, wherein,

Said light irradiation device further optionally produces: territory, the second green arrowband light that in green band territory, is restricted to the first green arrowband territory light in specific band territory and the half breadth of this territory, first green arrowband light is expanded within the specific limits.

3. electronic endoscope system as claimed in claim 2, wherein,

Said video camera controller is controlled said imaging apparatus, thus, and when being judged to be said close shot observation state, further to taking by the said irradiated body tissue of territory, said first green arrowband optical illumination; When being judged to be said distant view observation state, further to taking by the said irradiated body tissue of territory, said second green arrowband optical illumination.

4. electronic endoscope system as claimed in claim 3, wherein,

Territory, said second blue arrowband light has following characteristic,, is more leaning on long wavelength side than near the centre wavelength the 460nm that is, and light quantity sharply reduces; At short wavelength side, light quantity reduces gradually between 400nm～460nm, and light quantity sharply reduces when being lower than 400nm,

The centre wavelength of territory, said second green arrowband light is 550nm, and half breadth is 20nm～40nm.

5. electronic endoscope system as claimed in claim 3, wherein,

Said light irradiation device comprises:

Blue-light source, it optionally produces the said first blue arrowband territory light and territory, said second blue arrowband light; And

Green light source, it optionally produces the said first green arrowband territory light and territory, said second green arrowband light.

6. electronic endoscope system as claimed in claim 5, wherein,

Said blue-light source or said green light source can be regulated the half breadth of the said second blue arrowband territory light or territory, said second green arrowband light in certain limit.

7. electronic endoscope system as claimed in claim 6, wherein,

Said blue-light source or said green light source are certain mode according to the ratio at brightness ratio Lb/Lg under the said close shot observation state and brightness ratio the Lb '/Lg ' when said distant view is observed; Half breadth to the said second blue arrowband territory light or territory, said second green arrowband light is regulated; And

Lb: organize the resulting first blue image pickup signal in the irradiation of territory, said first blue arrowband light, taking said irradiated body under the said close shot observation state by said imaging apparatus,

Lg: organize the resulting first green image pickup signal in the irradiation of territory, said first green arrowband light, taking said irradiated body under the said close shot observation state by said imaging apparatus,

Lb ': organize the resulting second blue image pickup signal in the irradiation of territory, said second blue arrowband light, taking said irradiated body under the said distant view observation state by said imaging apparatus,

Lg ': organize the resulting second green image pickup signal in the irradiation of territory, said second green arrowband light, taking said irradiated body under the said distant view observation state by said imaging apparatus.

8. electronic endoscope system as claimed in claim 6, wherein,

According to the regulated quantity of the half breadth of the said second blue arrowband territory light or territory, said second green arrowband light, change generate the signal processing that monitor shows the view data of usefulness from said image pickup signal.

9. electronic endoscope system as claimed in claim 3, wherein,

Said light irradiation device comprises:

The wide band light source, it sends the wide band light from the blue ribbon territory to the red zone territory;

Rotary filter; It is used for taking out specific territory, arrowband light from said wide band light, and this rotary filter has: make territory, said first blue arrowband light transmission territory, first blue arrowband light transmission light filter, make territory, said second blue arrowband light transmission territory, second blue arrowband light transmission light filter, make the first green arrowband territory light transmission light filter of territory, said first green arrowband light transmission and make territory, the second green arrowband light transmission light filter of territory, said second green arrowband light transmission.

10. electronic endoscope system as claimed in claim 1, wherein,

Said observation state decision maker detects light exposure according to said image pickup signal, and, be under the situation more than the certain value in the light exposure that is detected, be judged to be said close shot observation state; Under the situation of not enough certain value, be judged to be said distant view observation state.

11. an electronic endoscope system, it comprises:

Imaging apparatus, it takes and produces image pickup signal to endoceliac irradiated body tissue, and this imaging apparatus is configured in the endoscope distal end portion that in said body cavity, inserts;

Light irradiation device, it is when being judged to be said close shot observation state, and territory, the first blue arrowband light that will in the blue ribbon territory, be restricted to specific band territory is to said body cavity internal radiation; And, when being judged to be said distant view observation state, more leaning on the light quantity of long wavelength side not increase and only make territory, second blue arrowband light that the light quantity of short wavelength side increases to said body cavity internal radiation with making than the centre wavelength of territory, said first blue arrowband light.

12. an electronic endoscope system, it comprises:

Light irradiation device; It is to shining in the body cavity, and this light irradiation device optionally is created in the first blue arrowband territory light that is restricted to specific band territory in the blue ribbon territory and makes than the centre wavelength of this territory, first blue arrowband light and more leans on the light quantity of long wavelength side not increase and territory, second blue arrowband light that the light quantity of short wavelength side is increased;

The observation state decision maker, it takes a decision as to whether distance of inserting said endoceliac endoscope distal end portion and said endoceliac irradiated body tissue is whether near state is the close shot observation state, perhaps is that the distance of said endoscope distal end portion and said irradiated body tissue is that state far away is the distant view observation state; And

Imaging apparatus, it is disposed at said endoscope distal end portion, and this imaging apparatus is taken under said close shot observation state the said irradiated body tissue by territory, the first blue arrowband optical illumination that in the blue ribbon territory, is restricted to specific band territory; And take under said distant view observation state by making and more lean on the light quantity of long wavelength side not increase and only make the said irradiated body tissue of territory, the second blue arrowband optical illumination that the light quantity of short wavelength side increases than the centre wavelength of territory, said first blue arrowband light.

13. processor device; It is used for the image pickup signal from endoscope is carried out Flame Image Process; Said endoscope has following function; That is, will in the blue ribbon territory, be restricted to the first blue arrowband territory light in specific band territory and make than the centre wavelength of this territory, first blue arrowband light and more lean on the light quantity of long wavelength side not increase and function that territory, second blue arrowband light that the light quantity of short wavelength side increases is optionally shone in to body cavity; With the function that produces said image pickup signal by taking the irradiated body tissue at the imaging apparatus that endoscope distal end portion disposed that in said body cavity, inserts,

Said processor device comprises:

Video camera controller, it controls said imaging apparatus, thus, when being judged to be said close shot observation state, to taking by the said irradiated body tissue in the optical illumination of territory, the said first blue arrowband; When being judged to be said distant view observation state, to taking by the said irradiated body tissue of territory, said second blue arrowband optical illumination.

14. the camera shooting control method of an electronic endoscope system; This electronic endoscope system possesses endoscope and processor device; Said endoscope has the imaging apparatus that is disposed in the endoscope distal end portion that in body cavity, inserts, and takes the irradiated body tissue and produce image pickup signal through this imaging apparatus; Said processor device carries out Flame Image Process to the image pickup signal from said endoscope,

Said camera shooting control method comprises following steps:

Based on said image pickup signal whether judge distance at endoscope distal end portion and said irradiated body tissue be near state be carried out shooting under the close shot observation state, perhaps be that state far away is to take under the distant view observation state whether in the distance of said endoscope distal end portion and said irradiated body tissue;

When being judged to be said close shot observation state, take the said irradiated body tissue that is thrown light on by territory, the first blue arrowband light that in the blue ribbon territory, is restricted to specific band territory through imaging apparatus; When being judged to be said distant view observation state, taking by making through said imaging apparatus and more to lean on the light quantity of long wavelength side not increase and only make the said irradiated body tissue of territory, the second blue arrowband optical illumination that the light quantity of short wavelength side increases than the centre wavelength of territory, said first blue arrowband light.