CN209826643U - Lighting device and endoscope system - Google Patents

Abstract

The utility model provides a lighting device and endoscope system, the lighting device includes at least one continuous white light LED lamp pearl, at least one first narrowband LED lamp pearl, at least one second narrowband LED lamp pearl and light source controller, at least one continuous white light LED lamp pearl, at least one first narrowband LED lamp pearl, at least one second narrowband LED lamp pearl are close together, the half high wavelength's of first narrowband LED lamp pearl, second narrowband LED lamp pearl scope is different; the light source controller controls different types of LED lamp beads respectively and independently, or the light source controller controls each LED lamp bead respectively and independently. The utility model discloses a lighting device, life-span is high, the light path is simple, can send continuous white light and narrowband light to continuous white light and narrowband light or narrowband light combination can independent free light-emitting, and so-called narrowband light can emphasize hemoglobin.

Description

Lighting device and endoscope system

Technical Field

The present invention relates to an illumination device, and more particularly to an illumination device and an endoscope system.

Background

The medical field has now largely used electronic endoscopes for diagnosis and treatment of the interior of the human body. An electronic endoscope is inserted into a human tissue using a slender and flexible insertion portion, applies illumination light or a special spectrum to an object to be observed, and images an illumination region. The xenon lamp is mostly used as the illuminating light, for example, patent 200580029053.5 discloses that the xenon lamp is used in combination with a mechanically rotating narrow-band filter, so as to generate continuous white light and hemoglobin-emphasized narrow-band light, but the optical path is relatively complex, the continuous white light and the narrow-band light are mechanically switched, independent free light emitting of the continuous white light and the narrow-band light cannot be realized, the service life of the xenon lamp is relatively short, and the xenon lamp generally needs to be replaced within 500 hours.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model discloses a lighting device and endoscope system, life-span is high, the light path is simple, can send continuous white light and narrowband light to continuous white light and narrowband light or narrowband light combination can independent free light-emitting.

To this end, the technical scheme of the utility model is that:

a lighting device comprises at least one continuous white light LED lamp bead, at least one first narrow-band LED lamp bead, at least one second narrow-band LED lamp bead and a light source controller, wherein the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead are arranged together, and the half-height wavelengths of the first narrow-band LED lamp bead and the second narrow-band LED lamp bead are different; the light source controller respectively controls different types of LED lamp beads independently, or the light source controller respectively controls each LED lamp bead independently; the half-height wavelength of the first narrow-band LED lamp bead is 400-435 nm, and the half-height wavelength of the second narrow-band LED lamp bead is 505-585 nm.

The light source controller controls the LED lamp beads of different types respectively and independently, namely, each LED lamp bead of the same type is connected with the light source controller after being connected, and the light source controller controls the LED lamp beads of the type together. The light source controller controls each LED lamp bead independently, namely each LED lamp bead is connected with the light source controller.

By adopting the technical scheme, the light of the first narrow-band LED lamp bead and the light of the second narrow-band LED lamp bead can emphasize the hemoglobin. In addition, hemoglobin-enhanced light sources are present not only in the blue wavelength band but also in the green wavelength band. Each light source can independently and freely emit light, and the use is more flexible. And the LED light source is adopted, so that the cost is low. The continuous white light refers to white light with continuous spectral intensity distribution, and the discontinuous white light is prepared according to three primary colors. The narrow-band LED lamp beads refer to LED lamp beads with the spectral intensity full width at half maximum within 60 nm.

Further, the half-height wavelength of the first narrow-band LED lamp bead is smaller than the half-height wavelength of the second narrow-band LED lamp bead. The half-high wavelength of the narrow-band LED lamp bead refers to the wavelength corresponding to the half-peak position of the spectral intensity.

Furthermore, the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead are close to each other. In this way, the coupling light path is simplified and the white and narrow band light sources can be switched quickly.

As a further improvement of the utility model, the half-height wavelength of second narrowband LED lamp pearl is 505 ~ 565 nm.

As a further improvement of the present invention, the center wavelength of the first narrow-band LED lamp bead is smaller than the excitation wavelength of the continuous white-light LED lamp bead.

As a further improvement, the continuous white light LED lamp bead is externally provided with a light filter.

Further, the optical filter transmits white light emitted by the continuous white light LED lamp beads, and cuts off light emitted by the first narrow-band LED lamp beads.

As a further improvement of the present invention, the optical filter is a long-wave pass optical filter.

As a further improvement of the utility model, the optical filter is colored glass.

As a further improvement of the utility model, lighting device includes third narrowband LED lamp pearl and/or fourth narrowband LED lamp pearl, the half high wavelength of third narrowband LED lamp pearl, fourth narrowband LED lamp pearl is different with the half high wavelength of first narrowband LED lamp pearl, second narrowband LED lamp pearl. And the third narrow-band LED lamp bead and/or the fourth narrow-band LED lamp bead are electrically connected with the light source controller respectively.

Preferably, the half-height wavelength of the third narrow-band LED lamp bead is 440-500 nm; the half-height wavelength of the fourth narrow-band LED lamp bead is 590-650 nm. Further preferably, the half-height wavelength of the third narrow-band LED lamp bead is 470 nm; the half-height wavelength of the fourth narrow-band LED is 630 nm. Wherein the third narrowband LED lamp bead and the fourth narrowband LED lamp bead are close to the white light LED lamp bead, the first narrowband LED lamp bead or the second narrowband LED lamp bead.

As a further improvement, in the first narrow-band LED lamp bead, the second narrow-band LED lamp bead, be equipped with narrow-band dielectric film light filter or coloured glass cut-off filter on the narrow-band LED lamp bead that half height width is greater than 30 nm.

Further, the color rendering index of the continuous white light emitted by the continuous white light LED is higher than 90.

As a further improvement, the full width at half maximum of first narrowband LED lamp pearl, second narrowband LED lamp pearl is less than 30 nm.

Further, the lighting device comprises an aluminum substrate, and the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead are arranged on the aluminum substrate through patches.

The utility model discloses an endoscope system, it includes as above arbitrary one lighting device, endoscope, image processor equipment and display device. Wherein the endoscope conducts the illumination light generated from the illumination device and irradiates the observation object while imaging the irradiation region and feeding back to the image processor device, and the display device displays the image signal processed by the image processor device. The endoscope comprises at least one continuous white light LED lamp bead, at least one first narrow-band LED lamp bead and at least one second narrow-band LED lamp bead, wherein light emitted by the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead irradiates the endoscope through an optical fiber light guide beam, and an imaging part of the endoscope is connected with a display device through an image processor device.

Furthermore, a focusing lens group is arranged at the front end of each of the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead, light irradiated by the LEDs is focused through the focusing lens group and guided into the optical fiber light guide beam through the light guide connector, the optical fiber light guide beam is divided into two paths and is respectively connected with the illuminating lens, an image sensor of the image processor device is arranged behind the imaging lens group, and an imaging controller of the endoscope controls the image sensor to image.

Further, the light source controller controls one or more mixed LED lamp beads of a continuous white light LED lamp bead, a first narrow-band LED lamp bead and a second narrow-band LED lamp bead to continuously emit light, and meanwhile, an imaging part of the endoscope absorbs image signals to a light source irradiation area of the lighting device; or in the adjacent time corresponding to the adjacent shooting frame of the imaging part of the endoscope, the light source controller controls the on and off of the LED lamp beads or the LED lamp bead combinations of different types, and the on and off sequence of the LED lamp beads or the LED lamp bead combinations is periodically repeated, wherein the LED lamp bead combinations mean that the LED lamp beads of two different types can only be simultaneously on or off.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a lighting device, life-span is high, the light path is simple, can send continuous white light and narrowband light to continuous white light and narrowband light or narrowband light combination can independent free light-emitting, and so-called narrowband light can emphasize hemoglobin.

Drawings

Fig. 1 is an external view of an endoscope system according to embodiment 1 of the present invention.

Fig. 2 is a schematic block diagram of an endoscope system according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a lighting device according to embodiment 1 of the present invention.

Fig. 4 is an external view of a four-in-one LED of the lighting device according to embodiment 1 of the present invention.

Fig. 5 is a spectral intensity distribution diagram of three four-in-one LEDs according to embodiment 1 of the present invention.

Fig. 6 is a spectral intensity distribution diagram of the four-in-one LED of embodiment 1 of the present invention passing through the optical filter.

Fig. 7 is a graph of normalized hemoglobin absorption coefficients according to example 1 of the present invention.

Fig. 8 is a schematic diagram of the lighting device of embodiment 1 of the present invention for capturing an image of an observed object by alternately flickering continuous white light and emphasized narrow-band light.

Fig. 9 is a spectral intensity distribution diagram of a four-in-one LED according to embodiment 2 of the present invention.

The reference numerals include: 1-endoscope, 2-lighting device, 3-image processor device, 4-display device, 5-input device;

110-light guide joint, 111-window glass, 112-rod lens, 113-optical fiber light guide bundle, 114, 115-lighting lens;

120-video connector, 121-A/D converter, 122-imaging controller, 123-image sensor, 124-imaging lens group;

13-remote control button, 14-bending operation part, 15-holding part, 16-insertion tube, 17-bending part, 18-tip part;

21-a light source controller, 22-a four-in-one LED, 221-a continuous white LED, 222-a first narrow-band LED, 223, 224-a second narrow-band LED; 221 a-long wave pass filter, 223a, 224 a-filter, 23-focusing lens group;

31-controller, 32-memory, 33-image processor.

Detailed Description

Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in fig. 1, an endoscope system includes an endoscope 1, an illumination apparatus 2, an image processor device 3, a display device 4, and an input device 5. The endoscope 1 conducts illumination light generated from the illumination device 2 and irradiates onto an observation object while imaging an irradiation region. The image processor device 3 processes the image signal generated by the endoscope 1. The display device 4 displays the image signal processed by the image processor device 3. The input device 5 is composed of a keyboard or the like.

As shown in fig. 1, the endoscope 1 includes a light guide connector 110, a video connector 120, a remote control button 13, a bending operation unit 14, a grip unit 15, an insertion tube 16, a bending unit 17, and a distal end portion 18. Wherein the light guide connector 110 is detachably connected to the lighting device 2, and the video connector 120 is detachably connected to the image processor device 3. A remote control button 13 is provided on the top of the grip portion 15, which is used to switch the observation mode. By manually rotating the angle knob of the bending operation section 14, the bending section 17 can be controlled to be bent in the horizontal and vertical directions, and the tip end portion 18 is directed toward the object to be observed following the direction of the bending section 17. The insertion tube 16 is flexible so as to be able to bend inside the object to be observed.

As shown in fig. 2, the lighting device 2 includes a four-in-one LED22 and a light source controller 21, the four-in-one LED22 includes a continuous white LED221, a first narrow-band LED222, a second narrow-band LED223, and a second narrow-band LED224, the continuous white LED221, the first narrow-band LED222, the second narrow-band LED223, and the second narrow-band LED224 are closely arranged, and the continuous white LED221, the first narrow-band LED222, the second narrow-band LED223, and the second narrow-band LED224 are electrically connected to the light source controller 21, respectively. The front end of the four-in-one LED22 is provided with a focusing lens set 23, and the light irradiated by the four-in-one LED22 is focused by the focusing lens set 23 and guided into the optical fiber light guide bundle 113 through the light guide connector 110.

The light source controller 21 of the lighting device 2 controls the on-off time and the brightness value of four LEDs, namely, the continuous white light LED221, the first narrow-band LED222, the second narrow-band LED223, and the second narrow-band LED224, respectively, the focusing lens group 23 is configured to focus light emitted by the 4 LEDs, the focused light is guided into the optical fiber light guide bundle 113 through the light guide joint 110, and the optical fiber light guide bundle 113 is divided into two paths and is connected with the lighting lens 114 and the lighting lens 115, respectively.

The image processor device 3 includes a controller 31, a memory 32, and an image processor 33, and the controller 31 is electrically connected to the light source controller 21, the display device 4, the input device 5, and the memory 32, respectively. An image sensor 123 is disposed behind the imaging lens group 124, the image sensor 123 may be a CCD (metal coupled device) or a CMOS (complementary metal oxide semiconductor), and the imaging controller 122 controls imaging of the image sensor 123. The a/D converter 121 converts the analog signal of the image sensor 123 into a digital signal, and then transmits the digital signal to the image processor 33 of the image processor device 3 through the video connector 120. The controller 31 controls the imaging controller 122, the light source controller 21, the image processor 33, the display device 4 based on the specified observation mode, wherein the instruction is from the input device 5 or the remote control button 13.

As shown in fig. 3, for a detailed structural schematic diagram of the lighting device 2, the light source controller 21 individually controls each LED bead in the four-in-one LED22, a heat dissipation module of the four-in-one LED22 is not shown in the figure, and light emitted by the four-in-one LED22 passes through the focusing lens group 23, and is coupled into the optical fiber light guiding bundle 113 through the window glass 111 and the rod lens 112. The light guide connector 110 is detachably connected to the lighting device 2.

As shown in fig. 4, four LED beads are attached to the four-in-one LED22, the four LED beads are respectively 2mm × 2mm squares, and are closely adjacent to each other, and respectively include a continuous white LED221, a first narrow-band LED222, a second narrow-band LED223, and a second narrow-band LED224, where the first narrow-band LED222 is an LED with a full width at half maximum of 15nm and a central wavelength of 420 nm; the second narrow-band LED223 and the second narrow-band LED224 are both LEDs with the full width at half maximum and the center wavelength of 50nm being 540 nm. Four LED lamp pearl paster are on aluminium substrate board.

As shown in fig. 5, the continuous white LED221 is adhered with a long pass filter 221a by an optical adhesive, because the continuous white light emitted by the continuous white LED221 is generated by exciting the phosphor with the blue light having the central wavelength of about 450nm, and the long pass filter 221a cuts off the blue light having the central wavelength of 420nm generated by the first narrow-band LED222, and allows the continuous white light of the continuous white LED221 to pass through the long pass filter, which is to prevent the blue light generated when the first narrow-band LED222 is used from interfering with the light emitting effect of the continuous white LED221, so that the continuous white LED221 is excited by the interfering blue light to generate white light when not used. The long-wave pass filter 221a may be a dielectric film filter or a colored glass filter. In addition, the color rendering index of the continuous white light of the continuous white LED221 is higher than 90 in order to prevent color distortion of the observed object.

The second narrow-band LED223 and the second narrow-band LED224 are provided with a filter 223a and a filter 224a, respectively. Because the full widths at half maximum of the second narrow-band LED223 and the second narrow-band LED224 are narrow, and the filter 223a and the filter 224a are added, the full width at half maximum of the emergent light is 25 nm. Further, the filters 223a and 224a may use narrow-band dielectric film filters, but the filtering range of such filters is a function of the incident angle, which may cause the illuminating light to have a slight spectrum difference at different angles of view, and for scenes with high requirements for use, a subsequent light path may be required to alleviate the difference, for example, by optimizing the design of the illuminating lens group 114. Filters 223a and 224a may also use colored glass cut-off filters, whose filtering range is angle-independent, but only filters the left half of the spectral intensity distribution waveform. The use of dielectric film filters and colored glass filters each have advantages and disadvantages. The spectral intensity profile after the filter is shown in fig. 6. Since the brightness is reduced after the filtering, two identical narrow-band LEDs are used for the second narrow-band LED223 and the second narrow-band LED 224.

As shown in fig. 7, since the hemoglobin absorption coefficient has maximum values in both the blue light band and the green light band, and the two narrow-band spectral intensity distribution diagrams shown in fig. 6 are located near the two maximum values, the narrow-band light emitted from the first narrow-band LED222, the second narrow-band LED223, and the second narrow-band LED224 has a blood vessel enhancement function. The first narrow-band LED222 is a blue light narrow-band LED and has the function of emphasizing blood vessels on the surface layer of the mucosa; the second narrow-band LEDs 223 and 224 are green narrow-band LEDs and have a function of emphasizing blood vessels in the middle of the mucosa. The quad LED22 enables the continuous white light observation mode by turning on the continuous white LED221 and turning off the other three LEDs, and enables the accent narrow band light observation mode by turning on the first narrow band LED222, the second narrow band LED223, and the second narrow band LED224 and turning off the continuous white LED 221. The switching of the viewing mode can be by means of the input keypad 5 or the remote control buttons 13.

In addition, because the utility model discloses the LED that possesses continuous white light and emphasize narrow-band light is gathered together, only needs light source controller 21 to observe the mode through control current switch just can fast switch over continuous white light observation mode and emphasize narrow-band light observation mode, and the schematic diagram is shown as figure 8, and continuous white light and the alternative scintillation of emphasizing narrow-band light can shoot observed object image, switch continuous white light and emphasize narrow-band light in the adjacent time that image sensor 123 adjacent frame corresponds. Two frames are taken as a period T, the first half period is Ta, the second half period is Tb, continuous white light is turned on in the half period Ta, narrow-band light is turned off and emphasized in the half period Tb, and the continuous white light is turned off. The image signal is processed by the image processor device 3 and then output to the display device 4, which can simultaneously display the continuous white light observation mode image and the emphasized narrow-band light observation mode image, or certainly can display the continuous white light observation mode image and the emphasized narrow-band light observation mode image by using two display devices respectively. Under ordinary circumstances, a doctor needs to make a diagnosis of a region to be observed by manually switching the observation mode continuously, and now, with the above-described technique, the doctor can use the continuous white light observation mode and the emphasis narrow-band light observation mode for the same region to be observed at the same time. Will save the physician's effort and improve the accuracy of the diagnosis.

A summary of the above three viewing modes is shown in table 1, which is to turn on different LEDs corresponding to different viewing modes, where mode 1 is a continuous white light viewing mode, mode 2 is an accentuated narrow band light viewing mode, and mode 3 is a simultaneous continuous white light and accentuated narrow band light viewing mode. The table for the continuous white LED221 in mode 3 is divided into two halves, the left half table represents within half period Ta and the right half table represents within half period Tb, and the remaining three LEDs are the same in mode 3. Mode 3 can therefore be understood as LED221 being on for half period Ta and off for half period Tb; first narrow band LED222, second narrow band LED223, second narrow band LED224 are off for half period Ta and on for half period Tb. Where "on" represents on and "-" represents off.

Table 1 list of different viewing modes with different LEDs on for example 1

The four-in-one LED of the embodiment can also adopt a polymerization mode of different numbers of lamp beads such as two-in-one, six-in-one, nine-in-one and the like. A switching button of the observation mode may also be provided on the lighting device 2. The light source controller 21 separately controls each of the lamp beads, or separately controls different types of lamp beads, for example, the second narrow-band LEDs 223 and the second narrow-band LEDs 224 are LEDs with a central wavelength of 540nm and a full width at half maximum of 50nm, the light source controller 21 separately controls the second narrow-band LEDs 223 and the second narrow-band LEDs 224, or the second narrow-band LEDs 223 and the second narrow-band LEDs 224 are connected in series, and the light source controller 21 synchronously controls the two LEDs. The first narrow-band LED222 can also use other wave bands, such as LED lamp beads with half-high wavelength within 400-435 nm, where the half-high wavelength refers to the wavelength corresponding to half the peak power. The second narrow-band LED223 and the second narrow-band LED224 can also use other wave bands, such as half-high wavelength between 505-585 nm. As shown in the normalized hemoglobin absorption coefficient graph of FIG. 7, the curve having two maxima between 505 and 585nm is an oxygenated hemoglobin absorption curve, with 505 to 565nm corresponding to the first maximum and 565 to 585nm corresponding to the second maximum. 505-565 nm are green, can emphasize blood vessels in the middle of mucosa, and are more suitable for the CCD or COMS based on Bayer array which is widely used in the market at present. 565-585 nm is yellow to orange, and can emphasize the deeper blood vessel depth.

Example 2

Unlike example 1, the spectral intensity distribution of the second narrow-band LED224 is shown in fig. 9, which is a red LED having a full width at half maximum of 20nm and a central wavelength of 630 nm. This embodiment adds red narrow-band light to the blue-green emphasized narrow-band light of embodiment 1, so that the emphasized blood vessels become red instead of black, and the three red, green and blue lights are adjusted in proper proportion so that the image color of the non-blood vessel region is closer to natural color.

The results of the list of different observation modes with different LEDs turned on are shown in table 2, and it can be seen that with different LEDs turned on, the mode 1 is the continuous white light observation mode, the mode 2 is the narrow-band light-emphasized observation mode, the mode 3 is the red-band light-emphasized observation mode with the narrow-band light blood vessels emphasized, the mode 4 is the red-band light observation mode with the simultaneous continuous white light and the narrow-band light-emphasized observation mode, and the mode 5 is the simultaneous continuous white light and the narrow-band light-emphasized observation mode.

Table 2 example 2 list of different viewing modes with different LEDs on

Example 3

Unlike embodiment 1, in this embodiment, the second narrow-band LED224 is replaced by a blue LED having a full width at half maximum of 20nm and a center wavelength of 470nm, and an LED in this wavelength band and a second narrow-band LED223 having a center wavelength of 540nm can be used to detect the oxygen saturation level of hemoglobin in a blood vessel.

The list of different viewing modes for different LEDs on is shown in table 3, where mode 1 is a continuous white light viewing mode, mode 2 is an emphasized narrowband light viewing mode, mode 3 is a hemoglobin oxygen saturation viewing mode, mode 4 is a simultaneous continuous white light and emphasized narrowband light viewing mode, and mode 5 is a simultaneous continuous white light and hemoglobin oxygen saturation viewing mode.

Table 3 example 3 list of different viewing modes for different LEDs on

Example 4

Different from the embodiment 1, the embodiment has two more LEDs, namely a fifth LED and a sixth LED which are respectively adjacent to the four-in-one LED; wherein the fifth LED is an LED with a center wavelength of 470nm and a full width at half maximum of 20nm, and the sixth LED is an LED with a center wavelength of 650nm and a full width at half maximum of 20 nm. Thus, a six-in-one LED lamp panel is formed, and the light source controller 21 controls six LED lamp beads respectively. Different viewing modes corresponding to different LEDs on in embodiment 2 and embodiment 3 can be simultaneously achieved.

Example 5

Different from embodiment 1, in this embodiment, the second narrow-band LEDs 223 and 224 directly use the lamp beads with the full width at half maximum within 30nm and the central wavelength of 540nm, and no optical filter is required to be arranged on the second narrow-band LEDs 223 and 224. Because the full width at half maximum and the central wavelength of the beads of the second narrow-band LEDs 223 and 224 are changed, the effect of embodiment 1 can be achieved without an optical filter.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.

Claims (10)

1. An illumination device, characterized by: the LED lamp comprises at least one continuous white light LED lamp bead, at least one first narrow-band LED lamp bead, at least one second narrow-band LED lamp bead and a light source controller, wherein the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead are arranged together, the light source controller respectively controls LED lamp beads of different types independently, or the light source controller respectively controls each LED lamp bead independently;

the half-height wavelength of the first narrow-band LED lamp bead is 400 ~ 435nm, and the half-height wavelength of the second narrow-band LED lamp bead is 505 ~ 585 nm.

2. The lighting device of claim 1, wherein the second narrowband LED bead has a half-height wavelength of 505 ~ 565 nm.

3. A lighting device as recited in claim 1, wherein: the central wavelength of the first narrow-band LED lamp bead is smaller than the excitation wavelength of the continuous white light LED lamp bead; and an optical filter which transmits white light and cuts off light emitted by the first narrow-band LED lamp bead is arranged outside the continuous white-light LED lamp bead.

4. A lighting device as recited in claim 1, wherein: the LED lamp comprises a third narrow-band LED lamp bead and/or a fourth narrow-band LED lamp bead, the half-height wavelengths of the third narrow-band LED lamp bead and the fourth narrow-band LED lamp bead are different from the half-height wavelengths of the first narrow-band LED lamp bead and the second narrow-band LED lamp bead, and the third narrow-band LED lamp bead and/or the fourth narrow-band LED lamp bead are respectively electrically connected with a light source controller.

5. The lighting device of claim 4, wherein the third narrow-band LED bead has a half-height wavelength of 440 ~ 500 nm.

6. The lighting device of claim 4, wherein the fourth narrow-band LED bead has a half-height wavelength of 590 ~ 650 nm.

7. The lighting device of claim 1 ~ 6, wherein the narrow-band LED beads with the half-height width greater than 30nm of the first and second narrow-band LED beads are provided with a narrow-band dielectric film filter or a colored glass cut-off filter.

8. The lighting device of claim 1 ~ 6, wherein the full width at half maximum of the first and second narrow band LED beads is less than 30 nm.

9. An endoscope system, characterized in that the endoscope system comprises the lighting device, the endoscope, the image processor and the display device according to any one of claims 1 ~ 8, wherein light emitted by the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead is irradiated into the endoscope through the optical fiber light guide beam, and an imaging part of the endoscope is connected with the display device through the image processor.

10. An endoscope system according to claim 9 and wherein: the front ends of the at least one continuous white light LED lamp bead, the at least one first narrow-band LED lamp bead and the at least one second narrow-band LED lamp bead are provided with a focusing lens group, light irradiated by the LEDs is focused through the focusing lens group and guided into an optical fiber light guide beam through a light guide joint, the optical fiber light guide beam is divided into two paths and is respectively connected with the illuminating lens, and an image sensor of the image processor device is arranged behind the imaging lens group.