CN219250110U

CN219250110U - Light source device and endoscope system

Info

Publication number: CN219250110U
Application number: CN202222176720.6U
Authority: CN
Inventors: 董立; 刘娟娟
Original assignee: Changzhou Lianying Zhirong Medical Technology Co ltd
Current assignee: Changzhou Lianying Zhirong Medical Technology Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2023-06-27
Anticipated expiration: 2032-08-17

Abstract

The present application relates to a light source device and an endoscope system. The light source device comprises at least two light sources and a light combining module, the light source device is connected with the light guide module, the at least two light sources comprise first light sources, and the light combining module comprises a first light combining element; the first light combination element is arranged between the light guide module and the first light source and is used for transmitting a first light beam emitted by the first light source to form first transmission light; the first light combining element is further used for reflecting at least one second light beam emitted by at least one second light source to form first reflected light, combining the first reflected light and the first transmitted light to form first combined light, and transmitting the first combined light to the tested tissue by the light guide module. In the application, the first light beam is transmitted by the first light combining element and reaches the tested tissue through the transmission of the light guide module, so that the problem that the light quantity of the first light beam is insufficient due to the narrow-band characteristic or the light transmittance of the short-wave band is attenuated is solved, and the luminous flux of the first light beam is improved.

Description

Light source device and endoscope system

Technical Field

The present application relates to the technical field of medical equipment, and in particular, to a light source device and an endoscope system.

Background

In the medical imaging arts, it is common to use endoscopic systems for diagnosis. The endoscope system includes a light source device, an electronic endoscope, and a control device. In diagnosis using an endoscope system, in addition to the normal light observation mode for the inside of the specimen using white light, the special light observation mode for the specimen may be performed using special light of a narrow wavelength band.

The conventional light source device generally uses a plurality of Light Emitting Diodes (LEDs) to combine light so as to output light beams corresponding to different modes such as a normal light observation mode or a special light observation mode, but in the special light observation mode, the light flux of the special light is limited due to a narrower bandwidth of a narrow band, and furthermore, the transmittance of the light in a short wave band transmitted by the light guide module is lower than that of the light in a long wave band, so that the phenomenon of insufficient light flux of the short wave beam in the endoscope illumination is easy to occur, and therefore, the light fluxes of the white light and the special light have important significance on the judgment result.

The special light with the narrow wave band or the short wave band has the condition that the luminous flux is difficult to meet the application requirement, and particularly when the special light is observed at a medium and long distance, the identification of living tissues can be limited due to the insufficient luminous flux, and whether the living tissues are diseased or not can not be judged.

Disclosure of Invention

In view of the above, it is necessary to provide a light source device and an endoscope system capable of improving the luminous flux of special light.

In a first aspect, the present application provides a light source device, where the light source device includes at least two light sources and a light combining module, the light source device is connected with a light guiding module, the at least two light sources include a first light source, and the light combining module includes a first light combining element;

the first light combining element is arranged between the light guide module and the first light source.

In one embodiment, the light path distance between the first light source and the light inlet of the light guide module is smaller than or equal to the light path distance between the second light source and the light inlet.

In one embodiment, the first light source includes a narrow-band light source or a short-band light source, and the first light source includes any one of a violet light source, a blue light source, a green light source, an amber light source, and a red light source.

In one embodiment, the light combining module further includes at least one second light combining element, and a first included angle between each second light combining element and the first light combining element is smaller than a first preset angle.

In one embodiment, a second included angle between each first light combining element and an optical axis where the first light combining element is located is greater than or equal to a second preset angle and less than or equal to a third preset angle; the third included angle between each second light combining element and the optical axis where the second light combining element is located is larger than or equal to a fourth preset angle and smaller than or equal to a fifth preset angle.

In one embodiment, the light source device further comprises a light guide member; the light guide component is arranged at least one of the following positions;

the light guide component is arranged between the first light source and the first light combining element;

the light guide component is arranged between the second light source and the corresponding second light combining element;

the light guide member is disposed between the first light combining element and the light guide module.

In one embodiment, the light combining module further comprises a collimating lens;

the collimating lens is arranged between the first light source and the first light combining element; and/or

The collimating lens is arranged between the second light source and the corresponding second light combining element.

In one embodiment, the light combining module further includes a first optical filter and/or a second optical filter;

The first optical filter is arranged between the first light source and the first light combining element;

the second optical filter is arranged between the second light source and the second light combining element.

In one embodiment, if the second optical filter is disposed between the second light source and the second light combining element, an optical axis of the second light source is parallel to an optical axis of the output light of the light guiding module.

In one embodiment, the light combining module further includes a focusing lens, and the focusing lens is disposed between the first light combining element and the light guiding module.

In one embodiment, the light combining module further includes at least one light flux measuring module; the luminous flux measurement module comprises a beam splitter and a photoelectric sensor corresponding to the beam splitter;

the beam splitter is arranged between the first light source and the first light combining element; and/or the number of the groups of groups,

the beam splitter is arranged between each second light source and the second light combining element corresponding to each second light source.

In one embodiment, the light combining module further includes a third optical filter corresponding to each of the light flux measuring modules;

the third optical filter is arranged between the beam splitter and the photoelectric sensor.

In one embodiment, the light source device further comprises a first heat dissipation module and a second heat dissipation module; the heat dissipation direction of the first heat dissipation module is parallel to the optical axis of the output light, and the heat dissipation direction of the second heat dissipation module is perpendicular to the optical axis of the output light.

In one embodiment, the light source device further comprises a light source expansion interface; the expansion module comprises at least one light source and a light combination module corresponding to the at least one light source.

In one embodiment, the at least one light source includes an amber light source, and the light combining module corresponding to the at least one light source includes a third light combining element.

In one embodiment, the at least one light source includes a first infrared light source and a second infrared light source, and the light combining module corresponding to the at least one light source includes a fourth light combining element and a fifth light combining element.

In a second aspect, the present application further provides an endoscope system, where the endoscope system includes a light guide module, an illumination module, a camera module, a processing module, a display module, and a light source device provided in any of the foregoing embodiments;

the light source device is respectively connected with the first end of the control module and the light guide module, the second end of the control module is connected with the input module, the third end of the control module is connected with the first end of the processing module, and the second end of the processing module is connected with the camera module; and the third end of the processing module is connected with the display module.

The light source device comprises at least two light sources and a light combining module, wherein the light source device is connected with the light guide module, the at least two light sources comprise first light sources, and the light combining module comprises first light combining elements; the first light combination element is arranged between the light guide module and the first light source and is used for transmitting a first light beam emitted by the first light source to form first transmission light; the first light combining element is further used for reflecting at least one second light beam emitted by at least one second light source to form first reflected light, combining the first reflected light and the first transmitted light to form first combined light, and transmitting the first combined light to the tested tissue by the light guide module. According to the light source, the first light beam is transmitted by the first light combining element, reaches the tested tissue through the light guide module, and is not reflected, so that the optical transmission efficiency of the first light source is not easily affected by the assembly precision, the higher optical efficiency can be achieved, the problem that the light quantity of the first light beam is insufficient due to the narrow-band characteristic or the transmittance of light in a short wave band transmitted by the light guide module is attenuated is solved, and the luminous flux of the first light beam is improved.

Drawings

FIG. 1 is a schematic view of a first structure of a light source device according to an embodiment;

FIG. 2 is a schematic diagram of a second structure of a light source device according to an embodiment;

FIG. 3 is a first schematic diagram of a spectral graph of light sources in one embodiment;

FIG. 4 is a first transmittance spectrum of a dichroic mirror according to one embodiment;

FIG. 5 is a second transmittance spectrum of a dichroic mirror according to one embodiment;

FIG. 6 is a third transmittance spectrum of a dichroic mirror according to one embodiment;

FIG. 7 is a schematic view of a third structure of a light source device according to an embodiment;

FIG. 8 is a fourth transmittance spectrum of a dichroic mirror according to one embodiment;

FIG. 9 is a fifth transmittance spectrum for a dichroic mirror according to one embodiment;

FIG. 10 is a schematic view of a fourth structure of a light source device according to an embodiment;

FIG. 11 is a schematic view of a fifth structure of a light source device according to an embodiment;

FIG. 12 is a schematic view of a sixth structure of a light source device according to an embodiment;

FIG. 13 is a schematic view of a seventh structure of a light source device according to an embodiment;

FIG. 14 is a schematic view of an eighth structure of a light source device according to an embodiment;

FIG. 15 is a schematic view of a ninth structure of a light source device according to an embodiment;

FIG. 16 is a schematic view showing a tenth structure of a light source device in one embodiment;

FIG. 17 is a schematic view of an eleventh structure of a light source device in one embodiment;

FIG. 18 is a second schematic diagram of a spectral graph of light sources in one embodiment;

FIG. 19 is a graph showing the transmittance spectrum of the third light combining element according to one embodiment;

FIG. 20 is a schematic view showing a twelfth structure of a light source device in one embodiment;

FIG. 21 is a third schematic diagram of a spectral graph of light sources in one embodiment;

FIG. 22 is a graph showing the transmittance spectrum of the fourth light combining element according to one embodiment;

FIG. 23 is a graph showing transmittance spectra of a fifth light combining element according to one embodiment;

FIG. 24 is a first schematic view of an endoscope system in one embodiment;

FIG. 25 is a second schematic view of an endoscope system in one embodiment.

Reference numerals illustrate:

100. a light source device; 800. A light guide module; 101. A first light source;

102. a second light source; 201. A first light combining element; 202. A second light combining element;

203. a collimating lens; 205. A first optical filter; 206. A second optical filter;

207. a focusing lens; 208. A luminous flux measuring module; 209. A light guide member;

2081. a beam splitter; 2082. A photoelectric sensor; 210. A third filter;

212. A first heat dissipation module; 213. A second heat dissipation module;

40. an expansion module; 401. At least one light source;

402. at least one light source corresponding to the light combination module; 4011. An amber light source;

4021. a third light combining element; 4012. A first infrared light source;

4013. a second infrared light source; 4022. A fourth light combining element;

4023. and a fifth light combining element.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

In this application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In the field of medical equipment, endoscopes are widely used for discovering, diagnosing and treating lesions by being inserted into the inside of human body cavities such as esophagus, stomach and large intestine to carry out observation and diagnosis and providing corresponding illumination for internal observation through a light source device. For example, it is common to observe the surface integrity of living tissue using ordinary white light, and an enhanced image of high contrast of different objects of observation can be obtained according to absorption, reflection and scattering characteristics of mucous membranes and blood vessels. For example, contrast between mucosal surface capillaries and deep coarse blood vessels is enhanced by illuminating blue and green narrowband light, which facilitates lesion screening.

In the related art, after indocyanine green (Indocyanine Green, ICG) which is easy to absorb infrared light is injected intravenously, two wavelengths of infrared light are sequentially irradiated to obtain deep blood vessels of mucous membrane and blood flow enhancement information which are difficult to be identified by human eyes; or, the illumination light of 460nm (or 540 nm), 600nm and 630nm is respectively returned to obtain 3 narrow-band images, the light of 600nm and 630nm can reach a deeper position below a mucous membrane, the red of 600nm is more easily absorbed by hemoglobin in blood, and the visibility of deep blood vessels is improved through the absorption difference of the hemoglobin between 600nm and 630 nm; the blood vessel emphasized observation mode uses a first blue light having a peak wavelength of 430nm or 460nm and a (fluorescence converted) green light, or a second blue light having a peak wavelength of 405nm and a (fluorescence converted) green light, and uses different wavelengths to make penetration depths into living tissue different, thereby emphasizing blood vessels having different depths below the mucosa, and having practical application in the discovery of early cancers and the like.

In diagnosis using an endoscope system, in addition to the normal light observation mode for the inside of the specimen using white light, the special light observation mode for the specimen may be performed using special light of a narrow wavelength band.

In the conventional light source device, a plurality of Light Emitting Diodes (LEDs) are generally used for combining light so as to output light beams corresponding to different modes such as a normal light observation mode and a special light observation mode, but in the special light observation mode, the light flux of special light is limited due to a narrower bandwidth of a narrow band, and moreover, the transmittance of short-wave light transmitted by a light guide module is lower than that of long-wave light, so that the phenomenon of insufficient light flux of short-wave light in endoscope illumination is easy to occur.

In the conventional method, when the light source device is expanded to a light source device system having a special light observation mode, the endoscope is required to have two connection portions including a 1 st light guide portion for transmitting normal light and a 2 nd light guide portion for transmitting special light, respectively, and the 1 st light guide portion and the 2 nd light guide portion are mixed at random on the distal end side of the endoscope, and then irradiated to the subject through the illumination lens at the distal end portion, and the diameter of the corresponding light guide beam is required not to exceed a certain value because the diameter of the endoscope is reduced, and therefore the light flux of the outputted illumination light is also limited by the diameter of the light guide beam.

In order to solve the above problem of insufficient light flux, an embodiment of the present application provides a light source device, as shown in fig. 1, fig. 1 is a first schematic structural diagram of the light source device in an embodiment, where the light source device 100 includes at least two light sources, and a light combining module, the light source device 100 is connected to the light guiding module 800, the at least two light sources include a first light source 101, and the light combining module includes a first light combining element 201; the first light combining element 201 is disposed between the light guiding module 800 and the first light source 101, and is configured to transmit a first light beam emitted by the first light source 101 to form a first transmitted light; the first light combining element 201 is further configured to reflect the second light beam emitted by the at least one second light source 102 to form a first reflected light, and combine the first reflected light and the first transmitted light to form a first combined light, so that the light guiding module 800 transmits the first combined light to the tissue under test.

In this embodiment, as shown in fig. 1, the first light source 101 and the light guiding module 800 are located at two sides of the first light combining element 201, the second light source 102 is located below the first light combining element 201 (the positions of the first light source 101, the second light source 102, the first light combining element 201 and the light guiding module 800 are only described according to the two-dimensional diagram of fig. 1, and are not limited to the specific spatial positions of the optical elements), the first light combining element 201 is located at the position where the first light beam and the second light beam intersect, and the included angle between the first light beam and the optical axis of the second light beam is 45 degrees, or may be other angles.

In this embodiment, the first light beam emitted by the first light source 101 is directly transmitted through the first light combining element 201 to form a first transmitted light, the second light beam emitted by the second light source 102 is emitted through the first light combining element 201 to form a first reflected light, the first light combining element 201 integrates the first reflected light and the first transmitted light and outputs a first combined light, and the combined first combined light is conducted through the endoscope light guiding module 800 and finally output to the tested tissue. For example, the first light source 101 may be an ultraviolet light source, the second light source 102 may be a white light source, and the first light combining element 201 may be a dichroic mirror, where the first light combining element 201 is assumed to have a short-wave transmission characteristic with a transition region wavelength of about 410 nm to about 430nm, and the first light combining element 201 transmits a spectrum portion smaller than 420nm in the first light beam to form a first transmitted light, and reflects a spectrum portion larger than 420nm in the second light beam to form a first reflected light.

Optionally, the first light source 101 is a light emitting Diode (Light Emitting Diode, LED), a Laser Diode (LD);

alternatively, the second light source 102 may be a xenon lamp, a halogen lamp, or a solid state light emitting element such as a light emitting Diode (Light Emitting Diode, LED) or a Laser Diode (LD), including a fluorescent LED or a light source that emits light when a fluorescent substance is excited by the LD, such as a fluorescent white LED or a light source that emits white light when a fluorescent substance is excited by the LD.

Alternatively, the first light combining element 201 may be a dichroic mirror or other light combining element, or the like.

Alternatively, the light guide module 800 may be a light guide beam composed of a bundle of a plurality of optical fibers.

In the embodiment of the application, the light source device comprises at least two light sources and a light combining module, the light source device is connected with the light guide module, the at least two light sources comprise first light sources, and the light combining module comprises a first light combining element; the first light combination element is arranged between the light guide module and the first light source and is used for transmitting a first light beam emitted by the first light source to form first transmission light; the first light combining element is further used for reflecting at least one second light beam emitted by at least one second light source to form first reflected light, combining the first reflected light and the first transmitted light to form first combined light, and transmitting the first combined light to the tested tissue by the light guide module. According to the light source, the first light beam is transmitted by the first light combining element, reaches the tested tissue through the light guide module, and is not reflected, so that the optical transmission efficiency of the first light source is not easily affected by the assembly precision, the higher optical efficiency can be achieved, the problem that the light quantity of the first light beam is insufficient due to the narrow-band characteristic or the transmittance of light in a short wave band transmitted by the light guide module is attenuated is solved, and the luminous flux of the first light beam is improved.

In one embodiment, the optical path distance between the first light source and the light inlet of the light guide module is smaller than or equal to the optical path distance between the second light source and the light inlet.

In this embodiment, the optical path distance between the first light source and the light inlet of the light guide module is smaller than or equal to the optical path distance between the second light source and the light inlet, and the optical path distance between the first light source and the light inlet of the light guide module can be understood as the linear distance between the first light source and the light guide module, as shown in fig. 1, and the optical path distance between the second light source and the light inlet is the distance between the second light source and the first light combining element plus the distance between the first light combining element and the light guide module. The optical path distance between the first light source and the light inlet of the light guide module is smaller than or equal to the optical path distance between the second light source and the light inlet, the optical transmission efficiency of the first light source can be optimized through the shortest optical path distance, the luminous flux of the first light beam is further improved, the light source is easy to assemble and adjust, and the higher optical efficiency is achieved from the aspects of assembling and design.

In one embodiment, the first light source comprises a narrowband light source or a short-wavelength band light source, and the first light source comprises any one of a violet light source, a blue light source, a green light source, an amber light source, and a red light source.

In this embodiment, the first light source generally uses a narrow band spectrum, and the amount of illumination light in the spectrum band of the first light source is limited due to the narrow bandwidth, for example, a blue light source, a green light source, and a red light source. The short-wave band light source can be a purple light source and the like.

In this embodiment, the narrowband light source may be understood as a narrowband spectrum of the first light beam emitted by the first light source, for example, the first light source is an ultraviolet light source (uv_led), the bandwidth is less than or equal to 20nm, or the first light beam emitted by the first light source may not be a narrowband spectrum of the first light beam, but the first light beam is filtered by a filter, so as to obtain a narrowband spectrum, for example, the first light source is a green light source (g_led) with a bandwidth of about 100nm, and narrowband green light with a bandwidth of less than or equal to 50nm is obtained after narrowband filtering.

In this embodiment, since the transmittance of the short-wave band at the light guide module is lower than the transmittance of the long-wave band at the light guide module, the phenomenon of insufficient light quantity of the short-wave spectrum in the endoscope illumination is easy to occur.

It should be noted that this embodiment is only a list of several first light sources commonly used in the medical field, and is not a specific limitation of the first light source of the present application, and any light source with insufficient luminous flux on the tested tissue may be used as the first light source.

Fig. 2 is a second schematic structural diagram of the light source device in an embodiment, as shown in fig. 2, the light combining module further includes at least one second light combining element, and a first included angle between each second light combining element and the first light combining element 201 is smaller than a first preset angle; at least one second light combining element for reflecting and/or transmitting the second light beam emitted by each second light source to form a first incident light incident on the first light combining element 201; the first light combining element 201 is configured to reflect the first incident light to form first reflected light.

In this embodiment, if the first light combining element 201 and the second light combining element are dichroic mirrors, a first angle between the second light combining element and the first light combining element 201 is an angle between the dichroic mirrors; if the first light combining element 201 and the second light combining element are light combining prisms, the first angle between the second light combining element and the first light combining element 201 is the angle between the light combining surfaces.

In this embodiment, as shown in fig. 2, the light combining module includes a first light combining element 201, two second light combining elements, namely a second light combining element 2021 and a second light combining element 2022, respectively, a first light source 101, and second light sources, namely a light source 1021, a light source 1022 and a light source 1023, respectively. As shown in fig. 3, fig. 3 is a first schematic diagram of a spectrum graph of each light source, and L1, L2, L3, and L4 represent spectrum curves of the first light source 101, the light source 1021, the light source 1022, and the light source 1023, respectively. Specifically, the first light source 101 may be a uv_led emitting UV light in a wavelength band ranging from violet to blue, and the

light sources

1021, 1022, and 1023 are a blue light source B-LED emitting light in a blue wavelength band B, a green light source G-LED emitting light in a green wavelength band G, and a red light source R-LED emitting light in a red wavelength band R, respectively, wherein the peak wavelength of UV light emitted by the uv_led is smaller than the peak wavelength of B light emitted by the B-LED.

Wherein, because hemoglobin has strong absorption property to 405-415nm wave band spectrum, the UV-LED with 405-415nm peak wavelength is preferable, the wavelength range is preferably narrow band, the bandwidth is about 20nm, and the UV-LED is used for describing the blood vessel morphology near the near surface layer or the shallow surface layer according to the high scattering and strong absorption characteristics.

For the light source 1021 (blue light source), it preferably has a peak wavelength of 430 to 460nm, further, it preferably has a peak wavelength of 430 to 450nm, and a distinction between the surface blood vessel and the mucosa is made on the observation image by the difference in reflectance of the surface blood vessel, and it preferably has a wavelength range of narrow band with a bandwidth of about 20nm.

Generally, uv_led or b_led requires a narrowband filter in its collimating light path to meet its bandwidth requirement;

for light source 1022 (green light source), it preferably has a peak wavelength of 530-560 nm, with a bandwidth selectable to be broad, such as a bandwidth of about 100nm; preferably, the light source 1022 may be a blue LED which emits green light by exciting a phosphor, i.e., a fluorescent type g_led, preferably, the blue LED has blue excitation light having a peak wavelength of 410 to 440nm, the blue excitation light excites the phosphor to generate green light, and a small amount of the blue excitation light is directly transmitted without being absorbed by the phosphor, i.e., the light source 1022 emits light in a spectrum including a green band spectrum and also includes a small amount of blue excitation light, and the fluorescent type green LED is easier to realize high output light power than an LED which emits light itself as green.

Light source 1023 (red light source) preferably has a peak wavelength of 610-640nm, preferably in a narrow band with a bandwidth of about 20nm.

Specifically, as shown in fig. 4-6, taking the first light combining element and the second light combining element as dichroic mirrors as examples, fig. 4 is a first transmittance spectrum diagram of the dichroic mirrors in one embodiment, the dichroic mirrors shown in fig. 4 refer to the first light combining element 201, and the first light combining element 201 has a short-wave pass characteristic with a transition region wavelength of about 410-430nm, and can reflect spectral components of light beams of the light source 1021, the light source 1022 and the light source 1023, which are higher than 420nm and transmit light of the first light source 101 which is lower than 420 nm.

Fig. 5 is a second transmittance spectrum of the dichroic mirror in one embodiment, where the dichroic mirror shown in fig. 5 refers to the second light combining element 2021, and the second light combining element 2021 has a short-wave pass characteristic with a transition region wavelength of about 460-480nm, and reflects spectral components above 470nm in the light beam of the light source 1022 and below 470nm in the light beam of the light source 1021.

Fig. 6 is a third transmittance spectrum of the dichroic mirror in one embodiment, the dichroic mirror shown in fig. 6 refers to the second light combining element 2022, the second light combining element 2022 has a wavelength pass characteristic with a transition region wavelength of about 590-610nm, and spectral components above 600nm in the light beam of the light source 1023 transmitted and below 600nm in the light beams of the reflective light source 1021 and the light source 1022.

In the present embodiment, the above first light combining element 201 and each second light combining element are combined, so that the second light combining element 2021 transmits the light beam emitted by the light source 1021 and reflects the light beam emitted by the light source 1022 to obtain the combined light beam A1; the second light combining element 2022 transmits the light beam emitted by the light source 1023 and reflects the combined light beam A1 to obtain a combined light beam A2; the first light combining element 201 transmits the light beam emitted by the first light source 101, reflects the combined light beam A2, and forms a first combined light including the first light source 101, the light source 1021, the light source 1022 and the light source 1023, and outputs a spectrum component, so that the light guiding module 800 transmits the first combined light to the tissue under test. The light sources pass through the first light combining element 201 and the second light combining element to obtain mutually independent spectrum components, namely a purple spectrum smaller than or equal to 410nm, a blue spectrum larger than 410nm and smaller than 470nm, a green spectrum larger than 470nm and smaller than 600nm and a red spectrum larger than 600 nm.

In the present embodiment, the above-described light source 1021 (blue light source), light source 1022 (green light source), and light source 1023 (red light source) may be mixed in a specific ratio to output a general white light illumination meeting the demand for generating a contour image of the superficial mucosa; or special light illumination with the spectrum of the first light source 101 (ultraviolet light source) or the light source 1021 (blue light source) as the main spectrum for the surface and middle layer blood vessel emphasized observation; the common white light illumination and the special light illumination are mixed, namely, the spectrum component of the first light source 101 (ultraviolet light source) or the light source 1021 (blue light source) in the common white light illumination is properly improved, and the image which takes the whole outline of the surface tissue and the blood vessel emphasis observation into consideration is obtained.

Further, the light combining module further includes at least one second light combining element, besides the second structural schematic diagram of the light source device provided in fig. 2, the embodiment of the application may also change the light combining sequence between the light sources, adjust the light source device in the length and width directions, and implement an optimized spatial layout, as shown in fig. 7, compared with the light source device shown in fig. 2 in the above embodiment, the light source device overall has a length reduced in the horizontal direction and a length increased in the vertical direction. Wherein the optical axes of the light source 1021 (blue light source) and the light source 1023 (red light source) are parallel to the optical axis of the output light, and the optical axis of the light source 1022 (green light source) is perpendicular to the optical axis of the output light.

Specifically, as shown in fig. 8, fig. 8 is a fourth transmittance spectrum of the dichroic mirror in one embodiment, and the dichroic mirror shown in fig. 8 refers to the second light combining element 2023, where it is known that the second light combining element 2023 has a short-wave pass characteristic with a transition region wavelength of about 590-610nm, a spectral component smaller than 600nm in a light beam of the transmission light source 1022 (green light source), and a spectral component larger than 600nm in a light beam of the reflection light source 1023 (red light source).

FIG. 9 is a fifth transmittance spectrum of the dichroic mirror of one embodiment, the dichroic mirror shown in FIG. 9 referring to the second light combining element 2024. As can be seen from fig. 9, the second light combining element 2024 has a long-wavelength-pass characteristic with a transition region wavelength of about 460 to 480nm, and transmits a spectral component greater than 470nm out of the light beams of the light source 1022 (green light source) and the light source 1023 (red light source), and reflects a spectral component less than 470nm out of the light beam of the light source 1021 (blue light source).

According to the first transmittance spectrum of the first light combining element 201 shown in fig. 4, the first light combining element 201 has a short-wave transmission characteristic with a transition region wavelength of about 410-430 nm. The first light combining element 201 reflects a light beam higher than 420nm out of light beams of the light source 1021 (blue light source), the light source 1022 (green light source), and the light source 1023 (red light source) and transmits a spectral component of the first light source 101 lower than 420 nm. Referring to fig. 3, 8 and 9, it can be seen that the light sources pass through the first light combining element 201, the second light combining element 2023 and the second light combining element 2024 to obtain independent spectrum components, which are respectively a violet spectrum smaller than or equal to 420nm, a blue spectrum smaller than 470nm larger than 420nm, a green spectrum smaller than 600nm larger than 470nm and a red spectrum larger than 600 nm.

It should be noted that the present embodiment is merely a possible configuration of the light source device, and is not limited to the above implementation. Each light source is adjusted, replaced or increased according to the target observation requirement, and corresponding adjustment is carried out according to the specific spectral characteristics of the first light combining element and the second light combining element, so that the output illumination light meets the observation purpose.

In this embodiment, a second included angle between the first light combining element and the optical axis where the first light combining element is located is greater than or equal to a second preset angle and less than or equal to a third preset angle; the third included angle between the second light combining elements and the optical axis where the second light combining elements are located is larger than or equal to a fourth preset angle and smaller than or equal to a fifth preset angle.

Optionally, the second preset angle, the third preset angle, the fourth preset angle, and the fifth preset angle may be 30 degrees, 40 degrees, 60 degrees, and the like. The second preset angle, the third preset angle, the fourth preset angle and the fifth preset angle can be four angles which are arbitrarily different; the second preset angle may be equal to the fourth preset angle, and the second preset angle may be different from the fourth preset angle. Similarly, the third preset angle may be equal to or different from the fifth preset angle. Alternatively, the third preset angle and the fourth preset angle are the same.

In this embodiment, the second angle and the third angle are preferably equal to 45 degrees, or the second angle and the third angle may be other angles, such as 30 degrees and 60 degrees.

Further, the first included angle between each second light combining element and the first light combining element is smaller than or equal to a first preset angle, the first preset angle can be 10 degrees, 20 degrees and the like, wherein the first preset angle is preferably about 0 degrees, that is, each second light combining element and the first light combining element are arranged in parallel or tend to be parallel in space, interference of assembly space of each second light combining element and the first light combining element is avoided, and the structure is compact while the assembly manufacturability is ensured.

In this embodiment, the optical axis of the first light source 101 is coaxial with the optical axis of the output light of the light guiding module 800, and the optical path space may be pulled to set an optical filter, so as to realize the narrow-band light observation of the first light source 101.

Further, the optical axes of the second light source 1021 and the second light source 1023 are parallel to the optical axis of the output light of the light guide module 800, so that a filter is conveniently arranged in the optical axis direction of the second light source 1021 or/and the second light source 1023, and the second light beam emitted by the second light source 1021 or/and the second light source 1023 is subjected to narrow-band filtering, so that the narrow-band light observation of the second light source 1021 or/and the second light source 1023 is realized.

Fig. 10 is a schematic diagram of a fourth structure of the light source device in an embodiment, as shown in fig. 10, the light combining module further includes a collimating lens 203, where the collimating lens 203 is disposed between the first light source 101 and the first light combining element 201, and is configured to convert the first light beam into a parallel light beam to be incident on the first light combining element 201; alternatively, the collimating lens 203 is disposed between the second light source 102 and the corresponding second light combining element 202, and is configured to change the second light beam into a parallel light beam to be incident on the second light combining element 202.

In this embodiment, the parallel light beam may be an approximately parallel light beam based on the actual transmission situation of the light beam.

In this embodiment, when the first light beam emitted by the first light source 101 is a divergent light beam, a collimator lens 203 may be disposed between the first light source 101 and the first light combining element 201, the first light beam is changed into a parallel light beam and enters the first light combining element 201, a collimator lens 203 is disposed between each second light source 102 and the corresponding second light combining element 202, the second light beam is changed into a parallel light beam and enters the second light combining element 202, and the light path integration may be completed by using a dichroic mirror or other light combining element.

FIG. 11 is a schematic view of a fifth structure of a light source device according to an embodiment, as shown in FIG. 11, the light source device further includes a light guiding member 209; the light guide 209 is disposed at least one of the following positions; the light guiding component 209 is disposed between the first light source 101 and the first light combining element 201, and is configured to transmit the first light beam to the first light combining element 201; the light guiding component 209 is disposed between the second light source 102 and the corresponding second light combining element 202, and is configured to transmit the second light beam to the second light combining element 202; the light guiding component 209 is disposed between the first light combining element and the light guiding module, and is configured to transmit the first combined light to the light guiding module.

The light guide 209 may be a light guide beam formed of a plurality of optical fibers, a light guide rod, or a combination of a light guide beam and a light guide rod. The light guide rod has a light incident surface with a size larger than or equal to the light emergent surface, and is tapered when the light incident surface is larger than the light emergent surface.

In this embodiment, as shown in fig. 11, the light guide members 209 are respectively disposed between the first light source 101 and the second light source 102 and the first light combining element, specifically, the light guide fibers or/and the light guide rods; and 60 is a light guide component, which is disposed between the first light combining element and the light guide module, and is specifically a light guide rod or/and a light guide fiber.

In the present embodiment, a light guide 209 is disposed between the first light source 101 and the first light combining element 201, and between the second light source 102 and the second light combining element 202, specifically, the first light beam emitted from the first light source 101 is transmitted to the first light combining element 201, and the second light beam is transmitted to the second light combining element 202. Specifically, the light guide member 209 is disposed between the first light source 101 and the collimator lens 203, and between the second light source 102 and the collimator lens 203.

Further, as shown in fig. 11, a light guiding member 209 may be further disposed between the first light combining element 201 and the light guiding module 800, for transmitting the first combined light to the light guiding module 800. Specifically, the light guide member 209 is disposed between the focus lens 207 and the light guide module 800.

In this embodiment, according to the characteristic of free bending of the light guide beam (light guide fiber), the first light source 101 and the second light source 102 can be changed from fixed positions to other optimized arbitrary spatial positions, so that the first light source 101 and the second light source 102 can obtain better heat dissipation effect; further, on the one hand, the light guide rod or the tapered light guide rod plays a role in light homogenizing, on the other hand, the tapered light guide rod transforms the light emitting area and the light emitting angle of the light beam, so that the light emitted by the first light source is output to the subsequent first light combining element 201 with higher optical efficiency, or the first combined light output by the first light combining element 201 is incident to the subsequent light guide module 800 with higher optical efficiency; or the light guide member 209 combines the effects of the light guide beam (light guide fiber) and the light guide rod.

Fig. 12 is a schematic view of a sixth structure of the light source device in an embodiment, as shown in fig. 12, the light combining module further includes a first optical filter 205 and/or a second optical filter 206; the first optical filter 205 is disposed between the first light source 101 and the first light combining element 201, and is configured to transmit a light beam of a first target band of the first light beam; the second filter 206 is disposed between the second light source 102 and the second light combining element 202, and is configured to transmit a light beam of a second target band of the second light beam.

In the present embodiment, the first optical filter 205 is disposed between the first light source 101 and the first light combining element 201, and the second optical filter 206 is disposed between the second light source 102 and the second light combining element 202. Specifically, the first optical filter 205 may be disposed between the collimator lens 203 and the first light combining element 201. Similarly, the second optical filter 206 is disposed between the second collimating lens 203 and the second light combining element 202 corresponding to the second light source 102.

As shown in fig. 12, a first optical filter 205 is disposed between the first light source 101 (ultraviolet light source) and the first light combining element 201, and the wavelength range is preferably a filter with a narrow band width of about 20nm, and the first target wavelength band is 390nm to 410nm, so as to depict the morphology of the blood vessel near the near-surface layer or the shallow-surface layer.

Alternatively or additionally, as shown in fig. 12, the second light source 102 (blue light source) preferably has a peak wavelength of 430-460nm, and therefore, a second filter, preferably a filter with a narrow band width of about 20nm, is disposed between the second light source 102 (blue light source) and the second light combining element 202, to obtain a second target band of 430-450nm, and a distinction between the two is formed on the observed image by the difference between the reflectivity of the superficial blood vessel and the mucosa.

In this embodiment, the specific settings of the first target band and the second target band are set according to the actual requirement of observing the tissue under test.

In this embodiment, the second light source 102 (green light source) preferably has a peak wavelength of 530-560nm, the bandwidth of which can be selected to be broad, such as a bandwidth of about 100nm. For example, the second light source 102 (green light source) is a light source that emits green light by exciting a phosphor with a blue LED, preferably having a blue excitation light with a peak wavelength of 410 to 440nm, exciting the phosphor with the blue excitation light to generate green light, and a small amount of the blue excitation light is directly transmitted without being absorbed by the phosphor, i.e., the emission spectrum of the second light source 102 (green light source) contains a small amount of blue excitation light in addition to the green band spectrum, and the fluorescent green LED is easier to realize a high output light power than an LED that emits green itself.

In this embodiment, a second optical filter is disposed between the second light source and the second light combining element, so that an optical axis of the second light source is parallel to an optical axis of the output light of the light guide module, which can be understood as being convenient for the optical axis direction of the second light source to pull open the optical path space to dispose the second optical filter; if the second optical filter is not arranged between the second light source and the second light combining element, the optical axis of the second light source and the optical axis of the output light of the light guide module can be parallel or vertical, and the like, and the second light source and the second light combining element are arranged according to actual conditions; a compact spatial layout is achieved by optimizing the spatial arrangement.

Further, as shown in fig. 12, the light combining module further includes a focusing lens 207, where the focusing lens 207 is disposed between the first light combining element 201 and the light guiding module 800, and is configured to focus the first combined light to obtain a focused light beam.

In this embodiment, a focusing lens 207 may be further disposed between the first light combining element 201 and the light guiding module 800, where the focusing lens 207 converges the first combined light, and forms a focused light beam with a certain aperture angle β at the light outlet, and the focused light beam is coupled into the light guiding module 800.

Fig. 13 is a schematic view of a seventh structure of a light source device according to an embodiment, as shown in fig. 13, the light combining module further includes at least one luminous flux measuring module 208; the luminous flux measurement module 208 comprises a beam splitter 2081 and a photoelectric sensor 2082 corresponding to the beam splitter 2081; the beam splitter 2081 is disposed between the first light source 101 and the first light combining element 201, and is configured to split and reflect the first light beam to obtain a third light beam, where the third light beam is incident on the photoelectric sensor 2082 corresponding to the beam splitter 2081; and/or, the beam splitter 2081 is disposed between each second light source 102 and the second light combining element 202 corresponding to each second light source 102, and is configured to split and reflect the second light beam to obtain a fourth light beam, where the fourth light beam is incident on the photoelectric sensor 2082 corresponding to the beam splitter 2081; the photosensor 2082 is configured to detect a luminous flux of the third light beam and/or the fourth light beam.

In this embodiment, the light flux measurement module 208 includes a beam splitter 2081 and a photoelectric sensor 2082, where the beam splitter 2081 and the optical axis thereof form a certain angle, and the angle is disposed between the first light source 101 and the first light combining element 201. If other components are included between the first light source 101 and the first light combining element 201, for example, a collimating lens, a first optical filter, etc., the beam splitter 2081 may be disposed between the first optical filter 205 and the first light combining element 201, and the first light beam is split to obtain a third light beam, where the third light beam is incident on the photoelectric sensor 2082 corresponding to the beam splitter 2081, and the photoelectric sensor 2082 detects the third light beam incident on the photosensitive surface of the photoelectric sensor 2082 to obtain the detected light quantity of the third light beam.

In this embodiment, when the beam splitter 2081 and the optical axis thereof are disposed at a certain included angle, preferably, the included angle may be 50 ° to 70 °, the beam splitter 2081 and the corresponding first light combining element 201 tend to be configured in parallel, for example, the included angle between the first light combining element 201 and the optical axis is 45 °, the included angle between the beam splitter 2081 and the optical axis is 60 °, and the included angle between the two is 15 °, so that the spatial arrangement of the matched photoelectric sensor 2082 obtains an optimal spatial arrangement, thereby further improving assembly manufacturability and compact structure. When the beam splitter 2081 performs beam splitting, the beam splitting ratio of the beam splitter 2081 is less than or equal to 10%, so that on one hand, enough detection light quantity is obtained, and on the other hand, the effective illumination light quantity entering the subsequent optical path for integration is prevented from being excessively reduced, thereby reducing the luminous flux.

In the present embodiment, the specific setting position of the beam splitter 2081 disposed between the second light source 102 and the second light combining element 202 can be referred to the setting of the beam splitter 2081 between the first light source 101 and the first light combining element 201, for splitting and reflecting the second light beam to obtain a fourth light beam, where the fourth light beam is incident on the photoelectric sensor 2082 corresponding to the beam splitter 2081; the photosensor 2082 is configured to obtain the detected light amount of the fourth light beam.

Optionally, the beam splitter 2081 in this embodiment may be replaced by a beam splitter or other optical elements with beam splitting characteristics, and the photosensor 2082 may be a Photodiode (PD) or other types of luminous flux measuring components, which is not limited in this embodiment.

Fig. 14 is an eighth schematic structural view of a light source device according to an embodiment, as shown in fig. 14, the light combining module further includes a third optical filter 210 corresponding to the light flux measuring module; the third optical filter 210 is disposed between the beam splitter 2081 and the photosensor 2082, and is configured to transmit the light beam in the third target band and/or the fourth target band; the difference between the third target wave band and the first target wave band of the first light beam in the first synthesized light is smaller than a first preset difference threshold; the difference between the fourth target band and the second target band of the second light beam in the first combined light is smaller than a second preset difference threshold.

In this embodiment, in order to realize the stabilization of the illumination light color and the high-precision control of the brightness, the third light beam and the fourth light beam incident on the photosensor 2082 may be spectrally filtered. Optionally, a third filter 210 may be configured in the measurement light path of the photosensor 2082 (between the beam splitter 2081 and the photosensor 2082), and cut off the non-effective output spectrum portion of the illumination output light.

Optionally, the first preset difference threshold and the second preset difference threshold are not greater than 10nm. For example, the first target wavelength band of the first light beam in the first synthetic light is 390-410nm, that is, the short wave portion of the first target wavelength band of the first light beam is 390nm, the long wave portion is 410nm, the short wave portion of the third target wavelength band is 380-400nm, and the long wave portion of the third target wavelength band is 400-420nm, that is, the short wave portions of the first target wavelength band and the third target wavelength band of the first light beam are compared with the long wave portion.

In this embodiment, as shown in fig. 14, a third optical filter 210 is disposed between the beam splitter 2081 and the photosensor 2082, and the difference between the third target band and the first target band of the first light beam in the first combined light is smaller than a first preset difference threshold, that is, the detected spectrum obtained through the third optical filter 210 is identical to or similar to the output spectrum of the first light source 101 in the first combined light. The difference between the fourth target band and the second target band of the second light beam in the first combined light is smaller than a second preset difference threshold, that is, a third optical filter 210 is arranged between the photoelectric sensor 2082 and the beam splitter 2081, so as to ensure that the detection spectrum obtained through the third optical filter 210 is consistent or similar to the output spectrum of each second light source in the first combined light. For example, a light flux measurement module is disposed in the light path of each second light source, and a third optical filter 210 is disposed between each beam splitter 2081 and the corresponding photosensor 2082. For the light source 1022 (green fluorescent type), the third filter 210 is a bandpass filter having a transmission characteristic in the spectrum range of the light source 1022 (green fluorescent type), so as to effectively filter out blue laser light emission in the light emission spectrum of the light source 1022 (green fluorescent type), and ensure that the detection spectrum measured by the photosensor 2082 is similar or identical to the output spectrum of the light source 1022 (green fluorescent type) in the first synthetic light. For the light source 1021 (blue light source), a third filter 210 is disposed between the photosensor 2082 and the beam splitter 2081, and the third filter 210 is a bandpass filter having a transmission characteristic in a spectral range of the light source 1021 (blue light source), so as to ensure that a detection spectrum measured by the photosensor 2082 is similar to or identical to an output spectrum of the light source 1021 (blue light source) in the first combined light. For the light source 1023 (red light source), a third filter 210 is disposed between the photosensor 2082 and the beam splitter 2081, where the third filter 210 is a long-wave pass or band-pass filter with transmission characteristics in the spectrum range of the light source 1023 (red light source), so as to ensure that the detection spectrum measured by the photosensor 2082 is similar to or consistent with the output spectrum of the light source 1023 (red light source) in the first combined light.

Fig. 15 is a schematic diagram of a ninth structure of a light source device in an embodiment, as shown in fig. 15, where the light source device further includes a first heat dissipation module 212 and a second heat dissipation module 213, for dissipating heat from the light source device; the heat dissipation direction of the first heat dissipation module 212 is parallel to the optical axis of the output light, and the heat dissipation direction of the second heat dissipation module 213 is perpendicular to the optical axis of the output light.

In this embodiment, heat generated during the operation of the LED may cause a junction temperature (PN junction temperature) to increase, and related parameters of each light source are affected by the operation temperature, such as the light quantity and spectrum of the light source. The increase in junction temperature causes, on the one hand, a shift in peak wavelength and, on the other hand, a decrease in luminous flux with increasing junction temperature, with r_leds being particularly pronounced. Therefore, it is necessary to control heat dissipation of the light source device of the endoscope to maintain the light source device to operate in a reasonable temperature range.

In this embodiment, the heat dissipation module includes one or more fans configured in the light source device or the external space to perform air cooling, as shown in fig. 15, the first light source 101, the light source 1021, the light source 1022 and the light source 1023 are respectively arranged in two mutually perpendicular or approximately perpendicular directions, and according to the arrangement characteristics of the light sources in the light source device 100, the heat dissipation direction of the first heat dissipation module 212 and the heat dissipation directions S1 and S2 of the second heat dissipation module 213 are determined, where the heat dissipation direction of the first heat dissipation module 212 is parallel to the optical axis of the light output by the light guide module 800, and the heat dissipation direction of the second heat dissipation module 213 is perpendicular to the optical axis of the light output by the light guide module 800. Preferably, a first cooling fan and a second cooling fan are respectively arranged in the first cooling direction S1 and the second cooling direction S2, and are used for performing integral cooling on the light source device or/and other components (such as a circuit control component) of the endoscope light source device, and a good comprehensive cooling effect is achieved by using a limited number of fans through an optimized air duct design.

Further, when the light source device radiates heat, the heat radiation module can also radiate heat in a combination manner, for example, the light source device radiates heat in a conduction manner by adopting a heat conducting glue, a heat conducting fin, a heat radiating fin, water cooling or liquid cooling manner.

FIG. 16 is a schematic view of a tenth structure of a light source device according to an embodiment, as shown in FIG. 16, wherein the light source device further includes a light source expansion interface, and the light source expansion interface is used for connecting with an expansion module 40; the expansion module 40 includes at least one light source 401 and a light combining module 402 corresponding to the at least one light source.

In this embodiment, a corresponding light source expansion interface may be reserved on the light source device, and the expansion module 40 is connected through the light source expansion interface, so as to cover multiple lighting requirements in one endoscope light source device with low cost, more importantly, an interface may be reserved for the lighting requirements of subsequent novelty, and inheritance of the endoscope light source device is maintained.

Specifically, the "expansion module 40 includes at least one light source 401 and a light combining module 402 corresponding to the at least one light source" includes the following two possible structural manners:

the first structural mode is as follows: as shown in fig. 17, at least one light source includes an amber light source 4011, and a light combining module corresponding to the at least one light source includes a third light combining element 4021; a third light combining element 4021, the third light combining element 4021 being configured to transmit a fifth light beam emitted from the amber light source 4011 to form a second transmitted light; and reflects the second light beam emitted from the second light source 1023 corresponding to the third light combining element 4021 to form second reflected light; a second light combining element 202 for reflecting and/or transmitting the second transmitted light, the second reflected light and the first remaining second light beam to form a first incident light incident on the first light combining element 201; the first remaining second light beams comprise second light beams except the second light beams emitted by the second light sources corresponding to the third light combining element.

In this embodiment, as shown in fig. 17, the expansion module 40 includes an amber light source 4011 and a third light combining element 4021, and optionally, a collimating lens, a second filter, a light flux measuring module, and the like may be disposed between the amber light source 4011 and the third light combining element 4021.

In this embodiment, the fifth light beam emitted from the amber light source 4011 is changed into a parallel light beam through the collimating lens, the third light combining element 4021 transmits the parallel light beam to form a second transmitted light, the second light beam emitted from the second light source 1023 corresponding to the third light combining element 4021 is reflected to form a second reflected light, the second transmitted light, and the second light beam other than the second light beam emitted from the second light source 1023 are reflected and/or transmitted through each second light combining element 202 to form a first incident light incident to the first light combining element 201, so that light beams of the amber light source 4011 combined into the four light sources are combined to perform expansion integration.

In this embodiment, the spectrum graphs of the light sources in the light source device of fig. 17 are shown in fig. 18, and L1, L2, L3, L4, and L5 are the spectrum graphs of the ultraviolet light source, the blue light source, the green light source, the red light source, and the amber light source, respectively.

In this embodiment, fig. 19 is a spectrum diagram of a third light combining element in one embodiment, where the third light combining element 4021 has a short-wavelength characteristic with a transition region of about 600 nm to 620nm, and the spectral components of the transmitted amber light source 4011 below 610nm and the reflected red light source above 610 nm; according to the above-mentioned figures, the second light combining element 202 has different transition region long-wave pass or short-wave pass characteristics. The third light combining element 4021 may transmit the fifth light beam emitted from the amber light source 4011 to form a second transmitted light, and reflect the second light beam emitted from the second light source 1023 corresponding to the third light combining element 4021 to form, for example, a second reflected light; the second light combining element 202 reflects and/or transmits the second transmitted light, the second reflected light, and the second light beam emitted from the second light source 1023 corresponding to the third light combining element 4021 to form the first incident light incident to the first light combining element 201, and finally, the first light combining element 201 reflects the first incident light and transmits the first light beam emitted from the first light source to form the first combined light. The collimated light beams of the light sources are reflected and/or transmitted through the first light combining element 201, the second light combining elements 202 and the third light combining element 4021, so that the component spectrums of the light sources are mutually independent, and independent spectrums are obtained, namely, the part with the mutually overlapped wavelengths almost does not exist, so that the proportion control strategy of the component proportion of the light sources in the output light is conveniently simplified, and the high-precision lighting color and luminous flux stability control is realized.

In this embodiment, the peak wavelength of the amber light source 4011 is preferably 590-610nm, the absorption coefficient of the hemoglobin spectrum has a larger variation range around 600nm, the peak wavelength of the light source 1023 (red light source) is 620-640nm, and compared with the light emission spectrum of the amber light source 4011 around 590-610, the light emission spectrum of the light source 1023 (red light source) has smaller absorption coefficient of hemoglobin and scattering coefficient of living tissue, and the illumination of the amber light source 4011 and the light source 1023 (red light source) in the output light is beneficial to improving the visibility of deep blood vessels by utilizing the characteristic that the absorption and scattering characteristics of the hemoglobin to the light emission spectrum of the amber light source 4011 and the light source 1023 (red light source) are different.

Also, a photosensor may be provided in the optical path of the amber light source 4011 to detect the luminous flux emitted from the amber light source 4011, and a filter may be provided between the photosensor and the beam splitter.

The second structural mode is as follows: as shown in fig. 20, at least one light source includes a first infrared light source 4012 and a second infrared light source 4013, and a light combining module corresponding to the at least one light source includes a fourth light combining element 4022 and a fifth light combining element 4023; the fourth light combining element 4022 is configured to reflect the sixth light beam emitted by the first infrared light source 4012 to form a second incident light beam incident on the fifth light combining element 4023, and transmit the seventh light beam emitted by the second infrared light source 4013 to form a third transmitted light; the fifth light combining element 4023 is configured to transmit the second incident light and the third transmitted light, and reflect the second light beam emitted by the second light source 1023 corresponding to the fifth light combining element 4023 to form the third incident light incident to the second light combining element 202; a second light combining element 202 for reflecting and/or transmitting the third incident light and the second residual light beam to form a first incident light incident on the first light combining element 201; the second remaining second light beams include second light beams other than the second light beam emitted by the second light source 1023 corresponding to the fifth light combining element 4023.

In this embodiment, as shown in fig. 20, the extension module 40 includes a first infrared light source 4012, a second infrared light source 4013, a fourth light combining element 4022, and a fifth light combining element 4023. Alternatively, a collimator lens or the like may be provided between the first infrared light source 4012 and the fourth light combining element 4022 and between the second infrared light source 4013 and the fourth light combining element 4022. Particularly, a short-wave pass or band-pass filter may be added to each optical path of the first infrared light source 4012 and/or the second infrared light source 4013, so as to further highlight the narrow-band characteristics of 800-820nm and 920-940nm, preferably, a filter having a short-wave pass characteristic of less than 820nm is added to the optical paths of the fourth light combining element 4022 and the first infrared light source 4012, and a filter having a band-pass characteristic of 920-940nm is added to the optical paths of the fourth light combining element 4022 and the second infrared light source 4013.

In this embodiment, as shown in fig. 21, the spectrum graphs of the light sources in the light source device of fig. 20 are the spectrum graphs of the first infrared light source and the second infrared light source of the ultraviolet light source, the blue light source, the green light source, and the red light source, respectively, L1, L2, L3, L4, L6, and L7.

In this embodiment, the first infrared light source 4012 preferably has a wavelength in the range of 800 to 830nm; the second infrared light source 4013 has a longer wavelength than the first infrared light source 4012, and preferably has a wavelength in the range of 910 to 950nm. Fig. 22 is a graph showing transmittance spectra of a fourth light combining element according to an embodiment, in which the fourth light combining element 4022 has a wavelength band-pass characteristic of about 910-930nm in a transition region. The fourth light combining element 4022 transmits a spectral component of the second infrared light source 4013 higher than 920nm, and reflects a spectral component lower than 920nm in the light beam of the first infrared light source 4012 to form first transmission light.

In this embodiment, fig. 23 is a transmittance spectrum of a fifth light combining element according to an embodiment, and it can be seen that the fifth light combining element 4023 has a wavelength band-pass characteristic of a transition region wavelength of about 790-810 nm. The fifth light combining element 4023 transmits a spectral component of the first transmitted light greater than 800nm, and reflects a spectral component of less than 800nm in the light beam of the light source 1023 (red light source) to form third incident light.

In this embodiment, as well, according to the above-mentioned figures, each second light combining element has different transition region long-wave pass or short-wave pass characteristics, and the second light combining element reflects and/or transmits the third incident light and the second light beam other than the second light beam emitted by the second light source corresponding to the fifth light combining element according to the transition region long-wave pass or short-wave pass characteristics to form the first incident light incident on the first light combining element 201. Finally, the first light combining element 201 reflects the first incident light and transmits the first light beam emitted by the first light source to form a first combined light. The collimated light beams of the light sources are reflected and/or transmitted through the first light combining element 201, the second light combining elements 202, the fourth light combining element 4022 and the fifth light combining element 4023, so that the component spectrums of the light sources are mutually independent, and independent spectrums are obtained.

In the present embodiment, it is preferable that, as in the above-described embodiments, each light source is provided with a photosensor to detect the luminous flux emitted from each light source, and at the same time, a filter is arranged in the detection optical path of the photosensor.

Further, a circuit interface can be further arranged on a circuit connected with the light source device, and the circuit is connected through the circuit interface, so that the control of the light source of the expansion module is realized.

It should be noted that, through the above expansion or replacement manner, the expansion module can cover multiple illumination requirements in one endoscope light source device with low cost, and more importantly, can reserve the connection for the illumination requirements of subsequent novelty.

In this embodiment, a normal white light mode, a special light illumination mode, and a mixed light mode with white light illumination respectively realize overall contour observation of an observation object, vessel emphasized observation of a surface layer and a middle layer, and a mixed light observation image of overall contour and vessel emphasized observation is considered; in an expanded mode, the infrared observation mode (a first infrared light source and a second infrared light source) is provided, and after ICG which is easy to absorb infrared light is injected intravenously, an observation image with clear information of blood vessels and blood flow in the deep part of the mucous membrane is realized; or legacy, to reserve an interface for new special light/mixed light illumination.

Fig. 24 is a first schematic view of an endoscope system according to an embodiment, as shown in fig. 24, where the endoscope system includes a light guide module 800, an illumination module 200, an image capturing module 300, a processing module 400, a display module 700, and the light source device 100 according to any of the above embodiments; a light source device 100 for transmitting the first combined light to the illumination module 200 through the light guide module 800; the illumination module 200 is used for diffusing the first synthesized light transmitted to the illumination module 200 to the tested tissue; the camera module 300 is used for acquiring an image of the tested tissue; the processing module 400 is configured to perform signal processing on the image to obtain a signal-processed image;

and the display module 700 is used for displaying the image after the signal processing.

In this embodiment, as shown in fig. 24, the light source device transmits the first composite light to the illumination module 200 through the light guide module 800, the illumination module 200 may be an illumination lens, diffuse the first composite light transmitted to the illumination lens to the tissue under test through the illumination lens, provide illumination light with enough brightness for the tissue under test, the image capturing module 300 acquires an image of the tissue under test, transmit the image of the tissue under test to the processing module 400, the processing module 400 performs signal processing on an electrical signal of the image to obtain a processed image, and transmit the processed image to the display module 700 for the display module 700 to display the processed image.

In one embodiment, the light source device comprises a photosensor; a photosensor for detecting luminous fluxes of the respective light sources at a preset driving current; the processing module is also used for acquiring a detection signal of the luminous flux and adjusting the driving current of the light source device according to the difference value between the detection signal and a preset detection signal.

In the present embodiment, the light source device includes the photosensor, the mounting position of the photosensor can be seen from the above-described embodiment, and feedback control of the driving current (or voltage) of each light source is achieved using the measurement result of the photosensor.

Specifically, the preset luminous flux detection signal is obtained by calibrating the detection signal of the photoelectric sensor, and the corresponding relation among different driving currents of each light source, the detection signal and the luminous flux is established. When the light source is calibrated, the driving current I1-IN of each light source 11-1N is changed or increased point by point, the beam splitter IN the collimation light path of each light source 11-1N splits the light beam to be incident on the photoelectric sensor, the photoelectric sensor detects the luminous flux phi 1-phi N of each photoelectric sensor of each light source under the corresponding driving current, and the luminous flux signals phi 1-phi N are converted into detection signals L1-LN, so that the corresponding relation of the driving current, the detection signals and the luminous flux is Ii:L1:phi I (i=1-N). And (3) obtaining a relation curve of the three through multi-point test, thereby finishing calibration, and storing a calibration result in the processing module.

Further, the control module stores the calibration result, and accurately realizes feedback control of the output light quantity of each light source according to the calibration result.

In this embodiment, adjusting the driving current of the light source device according to the difference value between the detection signal and the preset luminous flux detection signal includes, if the actual detection signal is smaller than the preset detection signal, correspondingly increasing the driving current corresponding to the light source; if the actual detection signal is greater than the preset detection signal, the driving current corresponding to the light source is correspondingly reduced.

In this embodiment, since the stability of the illumination light color has a significant influence on the observation of the lesion tissue, the brightness of the illumination light has a significant influence on the intensity of the image signal, that is, the definition of the output image, and the feedback control of the output light quantity of each light source can be accurately realized by combining the real-time signal detection of the photoelectric sensor with the calibration result, so that the stability of the hue and the luminous flux of the illumination light are maintained, and the illumination light required by the camera module is provided.

FIG. 25 is a second schematic view of an endoscope system in one embodiment, as shown in FIG. 25, the endoscope system 1 further comprising an input module 600 and a control module 500; an input module 600, configured to obtain an input instruction; the input instruction comprises a working instruction of any one light mode of a common white light mode, a special light mode and a mixed light mode; the control module 500 is configured to control the light mode of the first composite light according to the light mode in the input instruction.

In the present embodiment, the normal white light mode is to output illumination light of white light tone by proportional control of each light source component, and acquire an overall contour image of living tissue by an endoscope system; the special light mode is different from the ordinary white light mode, at least comprises a special light source, such as a purple light source, a blue light source, a green light source and the like, according to different incident depths of different wavelengths in living tissues, namely the longer the wavelength is, the deeper the incident depth of the living tissues is, the higher the absorption of blood vessels with different depths through the surface layer and the middle layer is compared with the lower absorption of mucous membrane, and the high-contrast images of the blood vessels with different depths are obtained through an endoscope system; the mixed light mode is different from the common white light mode and the special light mode, has a partial spectrum of the special light mode and has a partial spectrum of the common white light mode, so that the spectrum output different from the common white light mode and the special light mode is obtained, and the image which gives attention to the whole outline of the living tissue and the blood vessel emphasis observation is realized through the endoscope system.

In this embodiment, the endoscope system 1 further includes an input module 600 and a control module 500, the light source device 100 is connected to a first end of the control module 500, a second end of the control module 500 is connected to the input module 600, a third end of the control module 600 is connected to a first end of the processing module 600, and a second end of the processing module 600 is connected to the camera module 300.

In this embodiment, an input instruction of any one of a normal white light mode, a special light mode and a mixed light mode is input in the input module 600, and the control module 500 controls the light mode of the first composite light based on the light mode in the input instruction, so as to complete switching among multiple illumination light modes of the normal white light mode, the mixed light mode or the special light mode.

In this embodiment, the control module 500 may also adjust the driving current (or voltage) of each light source, adjust the variation of the luminous flux output by each light source, or change the luminous flux by adjusting the current pulse duty ratio (Pulse Width Modulation, PWM); or the working states of the light source device 100 and the camera module 300 are controlled, for example, the output light flux proportion of each light source is controlled to reach a corresponding illumination light mode according to a preset light flux ratio, the output light flux of each light source is integrally adjusted according to the brightness level imaged by the camera module 300, and the real-time feedback control of each light source component in the output illumination light is realized by arranging the light flux measuring module in the light source device, so that the color tone stability and the light flux stability of the illumination light are maintained, the illumination light required by the camera module 300 is provided, and meanwhile, the light quantity control strategy is simplified.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims

1. The light source device is characterized by comprising at least two light sources and a light combination module, wherein the light source device is connected with the light guide module, the at least two light sources comprise a first light source and a second light source, and the light combination module comprises a first light combination element;

the first light combination element is arranged between the light guide module and the first light source; the light path distance between the first light source and the light inlet of the light guide module is smaller than or equal to the light path distance between the second light source and the light inlet.

2. A light source device according to claim 1, wherein the first light source comprises a narrow-band light source or a short-band light source, and the first light source comprises any one of a violet light source, a blue light source, a green light source, an amber light source, and a red light source.

3. The light source device according to claim 1, wherein the light combining module further comprises at least one second light combining element, and a first included angle between each second light combining element and the first light combining element is smaller than a first preset angle.

4. A light source device according to claim 3, wherein a second included angle between the first light combining element and an optical axis of the first light combining element is greater than or equal to a second preset angle and less than or equal to a third preset angle; the third included angle between each second light combining element and the optical axis where the second light combining element is located is larger than or equal to a fourth preset angle and smaller than or equal to a fifth preset angle.

5. A light source device according to any one of claims 1-4, further comprising a light guide member; the light guide component is arranged at least one of the following positions;

The light guide component is arranged between the second light source and the corresponding second light combination element;

6. A light source device according to claim 3 or 4, wherein the light combining module further comprises a collimator lens;

7. The light source device according to claim 3 or 4, wherein the light combining module further comprises a first optical filter and/or a second optical filter;

8. The light source device according to claim 7, wherein if the second filter is disposed between the second light source and the second light combining element, an optical axis of the second light source is parallel to an optical axis of the output light of the light guiding module.

9. A light source device according to any one of claims 1-4, wherein the light combining module further comprises a focusing lens, the focusing lens being disposed between the first light combining element and the light guiding module.

10. The light source device according to any one of claims 1 to 4, wherein the light combining module further comprises at least one luminous flux measuring module; the luminous flux measurement module comprises a beam splitter and a photoelectric sensor corresponding to the beam splitter;

11. The light source device according to claim 10, wherein the light combining module further comprises a third filter corresponding to the luminous flux measuring module;

12. The light source device of claim 8, further comprising a first heat sink module and a second heat sink module; the heat dissipation direction of the first heat dissipation module is parallel to the optical axis of the output light, and the heat dissipation direction of the second heat dissipation module is perpendicular to the optical axis of the output light.

13. A light source device according to any one of claims 2-4, further comprising a light source expansion interface; the light source expansion interface is connected with the expansion module; the expansion module comprises at least one light source and a light combination module corresponding to the at least one light source.

14. The light source device of claim 13, wherein the at least one light source comprises an amber light source and the light combining module corresponding to the at least one light source comprises a third light combining element.

15. A light source device as recited in claim 13, wherein the at least one light source comprises a first infrared light source and a second infrared light source, and the light combining module corresponding to the at least one light source comprises a fourth light combining element and a fifth light combining element.

16. An endoscope system, characterized in that the endoscope system comprises a light guide module, an illumination module, a camera module, a processing module, a control module, a display module, an input module and the light source device according to any one of claims 1-15;