CN115227188A

CN115227188A - Light source device and endoscope system

Info

Publication number: CN115227188A
Application number: CN202210989189.6A
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: 2022-10-25

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 first light combining elements; the first light combining 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 transmitted light; the first light combining element is also used for reflecting at least one second light beam emitted by at least one second light source to form first reflected light, and combining the first reflected light and the first transmitted light to form first combined light, so that the light guide module transmits the first combined light to the tested tissue. First light beam, the arrival examined the tissue through the transmission of leaded light module group of first light component transmission in this application, it is not enough because the light quantity that the narrowband characteristic leads to solve first light beam, perhaps the problem of the transmissivity decay of the light of shortwave band improves the luminous flux of first light beam.

Description

Light source device and endoscope system

Technical Field

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

Background

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

In the conventional light source device, a plurality of light-emitting diodes (LEDs) are generally used to combine light so as to output light beams corresponding to different modes, such as a normal light observation mode and a special light observation mode, respectively, but in the special light observation mode, since the bandwidth of a narrow wavelength band is narrow, the luminous flux of special light is limited, and furthermore, the transmittance of light in a short wavelength band transmitted by a light guide module is lower than that of light in a long wavelength band, and the luminous flux of short wavelength light in endoscopic illumination is also easy to be insufficient, so that the luminous fluxes of white light and special light have an important meaning for a determination result.

The above-mentioned special light of narrow band or short band has the situation that luminous flux is difficult to satisfy the application demand, especially when the long-range observation of well, and luminous flux is not enough can restrict the discernment to the live tissue, can't judge whether the live tissue takes place the pathological change.

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 the special light.

In a first aspect, the present application provides a light source apparatus, where the light source apparatus includes at least two light sources and a light combining module, the light source apparatus is connected to a light guide 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 and is used for transmitting a first light beam emitted by the first light source to form first transmitted light;

the first light combining element is further configured to reflect a second light beam emitted by a second light source to form first reflected light, combine the first reflected light and the first transmitted light to form first combined light, and transmit the first combined light to the tested tissue through the light guide module.

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

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;

the at least one second light combining element is used for reflecting and/or transmitting the second light beams emitted by the second light sources to form first incident light incident to the first light combining element;

the first light combining element is used for reflecting the first incident light to form the first reflected light.

In one embodiment, a second included angle between each of the first light combining elements and the 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; and a third included angle between the second light combination element and the optical axis of the second light combination element is greater than or equal to a fourth preset angle and less than or equal to a fifth preset angle.

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

the light guide component is arranged between the first light source and the first light combining component and is used for transmitting the first light beam to the first light combining component;

the light guide component is arranged between the second light source and the corresponding second light combining element and is used for transmitting the second light beam to the first light combining element;

the light guide component is arranged between the first light combining element and the light guide module and is used for transmitting the first synthesized light to the light guide module.

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

the collimating lens is arranged between the first light source and the first light combining element and is used for converting the first light beam into a parallel light beam to be incident on the first light combining element; and/or

The collimating lens is arranged between the second light source and the corresponding second light combining element, and is used for converting the second light beam into a parallel light beam to be incident on the second light combining element.

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

the first optical filter is arranged between the first light source and the first light combination element and is used for transmitting a light beam of a first target waveband in the first light beam;

the second optical filter is arranged between the second light source and the second light combining element and is used for transmitting the light beam of a second target waveband in the second light beam.

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 output light of the light guide 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, and is configured to focus the first combined light to obtain a focused light beam.

In one embodiment, the light combining module further comprises at least one light flux measuring module; the luminous flux measuring 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 is used for splitting the first light beam to obtain a third light beam and reflecting the third light beam to the photoelectric sensor corresponding to the beam splitter; and/or the presence of a gas in the gas,

the beam splitter is arranged between each second light source and the second light combining element corresponding to each second light source, and is used for splitting the second light beam to obtain a fourth light beam and reflecting the fourth light beam to the photoelectric sensor corresponding to the beam splitter;

the photoelectric sensor is used for detecting the luminous flux of the third light beam and/or the fourth light beam.

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

the third optical filter is arranged between the corresponding beam splitter and the corresponding photoelectric sensor and is used for transmitting light beams of a third target waveband and/or a fourth target waveband; the difference between the third target waveband and the first target waveband of the first light beam in the first synthetic light is smaller than a first preset difference threshold value; the difference between the fourth target waveband and the second target waveband of the second light beam in the first synthetic light is smaller than a second preset difference threshold value.

In one embodiment, the light source device further comprises a first heat dissipation module and a second heat dissipation module, which are used for dissipating heat of the light source device; 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, wherein the light source expansion interface is used for connecting an expansion module; the expansion module comprises at least one light source and a light combining 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;

the third light combining element is used for transmitting the fifth light beam emitted by the amber light source to form second transmitted light; a second light beam emitted by a second light source corresponding to the third light combining element is reflected to form second reflected light;

the second light combining element is used for reflecting and/or transmitting the second transmitted light, the second reflected light and the first remaining second light beam to form first incident light which is incident to the first light combining element; the first remaining second light beam comprises a second light beam except the second light beam emitted by the second light source corresponding to the 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;

the fourth light combining element is configured to reflect the sixth light beam emitted by the first infrared light source to form a second incident light beam incident to the fifth light combining element, and transmit a seventh light beam emitted by the second infrared light source to form a third transmitted light beam;

the fifth light combining element is configured to transmit the second incident light and the third transmitted light, and reflect a second light beam emitted by a second light source corresponding to the fifth light combining element to form third incident light incident on the second light combining element;

the second light combining element is used for reflecting and/or transmitting the third incident light and the second residual second light beam to form first incident light incident to the first light combining element; the second residual light beam comprises a second light beam except the second light beam emitted by the second light source corresponding to the fifth light combining element.

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

the light source device is used for transmitting the first synthesized light to the illumination module through the light guide module;

the illumination module is used for diffusing the first synthesized light transmitted to the illumination module to the tested tissue;

the camera module is used for acquiring an image of the tested tissue;

the processing module is used for carrying out signal processing on the image to obtain an image after the signal processing;

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

In one embodiment, the light source device comprises a photosensor;

the photoelectric sensor is used for detecting the luminous flux of each light source under a preset driving current;

the processing module is further configured to obtain a detection signal of the luminous flux, and adjust a driving current of the light source device according to a difference value between the detection signal and a preset detection signal.

In one embodiment, the endoscopic system further comprises an input module and a control module;

the input module is used for acquiring an input instruction; the input instruction comprises a working instruction of any one of a common white light mode, a special light mode and a mixed light mode;

and the control module is used for controlling the light mode of the first synthesized light according to the light mode in the input instruction.

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 combining 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 transmitted 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, and combining the first reflected light and the first transmitted light to form first combined light so that the light guide module transmits the first combined light to the tested tissue. First light beam of light component transmission, reacing through the transmission of leaded light module group in this application is surveyed the organization, no reflection light path turns over etc, consequently, the optical transmission efficiency of first light source is difficult to receive the influence of assembly precision to can reach higher optical efficiency, solve first light beam because the light quantity that the narrowband characteristic leads to is not enough, perhaps the problem of the transmissivity decay of the light of the short wave band of leaded light module group transmission improves the luminous flux of first light beam.

Drawings

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

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

FIG. 3 is a first schematic diagram of a spectral plot of each light source in one embodiment;

FIG. 4 is a first transmittance spectrum for a dichroic mirror in one embodiment;

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

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

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

FIG. 8 is a fourth transmittance spectrum for a dichroic mirror in one embodiment;

FIG. 9 is a fifth transmittance spectrum of a dichroic mirror in one embodiment;

FIG. 10 is a fourth diagram illustrating an exemplary light source device;

FIG. 11 is a fifth structural diagram of a light source device in an embodiment;

FIG. 12 is a diagram illustrating a sixth configuration of a light source device in accordance with an exemplary embodiment;

FIG. 13 is a seventh structural diagram of a light source device in an embodiment;

FIG. 14 is a diagram illustrating an eighth configuration of a light source device in an embodiment;

FIG. 15 is a diagram illustrating a ninth configuration of a light source device in accordance with an embodiment;

FIG. 16 is a diagram illustrating a tenth construction of a light source device according to an embodiment;

FIG. 17 is a diagram illustrating an eleventh configuration of a light source device in an embodiment;

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

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

FIG. 20 is a twelfth structural diagram of a light source device in an embodiment;

FIG. 21 is a third schematic diagram of a spectral plot for each light source in one embodiment;

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

FIG. 23 is a graph of the transmittance spectrum of a fifth light combining element in one embodiment;

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

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

Description of reference numerals:

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 photosensor; 210. A third optical filter;

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

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

402. the light combining module corresponds to at least one light source; 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 clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the present application, the terms "first", "second" 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.

In the field of medical equipment, endoscopes are widely used for discovering, diagnosing and treating lesions by inserting the endoscopes into body cavities of human bodies, such as the esophagus, stomach and large intestine, and providing corresponding illumination for internal observation through a light source device. For example, the general white light is used to observe the overall properties of the surface of living tissue, and high-contrast enhanced images of different observed objects can be obtained according to the absorption, reflection and scattering characteristics of mucosa and blood vessels. Lesion screening is facilitated, for example, by illuminating blue and green narrow band light to enhance contrast of mucosal superficial capillaries and deep thick blood vessels.

In the related art, generally, infrared light of two wavelengths is sequentially irradiated after Indocyanine Green (ICG) which is easy to absorb infrared light is intravenously injected, so as to obtain mucosa deep blood vessel and blood flow enhancement information which are difficult to be recognized by human eyes; or, 3 narrow-band images are obtained by respectively returning the illuminating lights of 460nm (or 540 nm), 600nm and 630nm, the lights of 600nm and 630nm can reach a deeper position below the mucous membrane, the red light of 600nm is more easily absorbed by hemoglobin in blood, and the visibility of the deep blood vessel is improved through the absorption difference of the hemoglobin at 600nm and 630 nm; in the blood vessel enhancement observation mode, the first blue light and the (fluorescence converted) green light having a peak wavelength of 430nm or 460nm or the second blue light and the (fluorescence converted) green light having a peak wavelength of 405nm are used, and the depth of invasion into the living tissue is made different by the wavelength, so that blood vessels at different depths below the existing mucosa are enhanced and displayed, and the method is useful for the discovery of early cancer and the like.

When performing diagnosis using an endoscope system, a normal light observation mode is performed on the inside of a specimen using white light, and a special light observation mode is performed on the specimen using special light in a narrow wavelength band.

In the conventional light source device, a plurality of light-emitting diodes (LEDs) are generally used to combine light beams so as to output light beams corresponding to different modes, such as a normal light observation mode and a special light observation mode, respectively, but in the special light observation mode, since a bandwidth of a narrow wavelength band is narrow, a luminous flux of special light is limited, and furthermore, a transmittance of light of a short wavelength band transmitted by a light guide module is lower than that of light of a long wavelength band, so that a phenomenon that the luminous flux of the short wavelength beam is insufficient in the endoscope illumination is likely to occur.

In addition, in the conventional method, when the light source apparatus is expanded to a light source apparatus system having a special light observation mode, the endoscope needs to have two connection portions, the two connection portions include a1 st light guide portion and a2 nd light guide portion for transmitting normal light, respectively, the 1 st light guide portion and the 2 nd light guide portion are randomly mixed at the distal end side of the endoscope and then irradiated to the subject through an illumination lens at the distal end portion.

In order to solve the problem of insufficient luminous flux, an embodiment of the present application provides a light source device, as shown in fig. 1, fig. 1 is a schematic view of a first structure of the light source device in an embodiment, a light source device 100 includes at least two light sources and a light combining module, the light source device 100 is connected to a light guide 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 arranged between the light guide module 800 and the first light source 101, and is used for transmitting a first light beam emitted by the first light source 101 to form first transmitted light; the first light combining element 201 is further configured to reflect a 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 measurement.

In this embodiment, as shown in fig. 1, the first light source 101 and the light guide 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 embodiment only introduces the positions of the first light source 101, the second light source 102, the first light combining element 201, and the light guide module 800 according to the two-dimensional diagram of fig. 1, and does not specifically limit the spatial positions of the optical elements), the first light combining element 201 is located at a position where the first light beam and the second light beam intersect, an included angle between the first light beam and an optical axis of the second light beam is 45 degrees, and other angles may also be used, which is not limited in this embodiment.

In this embodiment, the first light beam emitted by the first light source 101 is directly transmitted by the first light combining element 201 to form first transmission light, the second light beam emitted by the second light source 102 is emitted by the first light combining element 201 to form first reflection light, the first light combining element 201 integrates the first reflection light and the first transmission light to output first combined light, and the combined first combined light is transmitted by the endoscope light guide module 800 and finally output to the tissue to be measured. 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, and assuming that the first light combining element 201 has a short wavelength pass characteristic in a transition region with a wavelength of about 410-430nm, the first light combining element 201 transmits a spectral portion smaller than 420nm in the first light beam to form first transmitted light, and reflects a spectral portion larger than 420nm in the second light beam to form first reflected light.

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

alternatively, the second Light source 102 may be a xenon lamp, a halogen lamp, or a Light Emitting Diode (LED), a Laser Diode (LD), or other solid Light Emitting devices, including a fluorescent LED or a Light source that emits Light by exciting a fluorescent substance by an LD, such as a fluorescent white LED or a Light source that generates white Light by exciting a fluorescent substance by an LD.

Optionally, the first light combining element 201 may be a dichroic mirror or other light combining elements.

Alternatively, the light guide module 800 may be a light guide bundle formed by bundling 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 first light combining elements; the first light combining 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 transmitted light; the first light combining element is also used for reflecting at least one second light beam emitted by at least one second light source to form first reflected light, and combining the first reflected light and the first transmitted light to form first combined light, so that the light guide module transmits the first combined light to the tested tissue. First light beam of light component transmission, reacing through the transmission of leaded light module group in this application is surveyed the organization, no reflection light path turns over etc, consequently, the optical transmission efficiency of first light source is difficult to receive the influence of assembly precision to can reach higher optical efficiency, solve first light beam because the light quantity that the narrowband characteristic leads to is not enough, perhaps the problem of the transmissivity decay of the light of the short wave band of leaded light module group transmission improves the luminous flux of first light beam.

In one embodiment, an optical path distance between the first light source and the light inlet of the light guide module is less than or equal to an 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 less 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, 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, as shown in fig. 1. 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, the optical transmission efficiency of the first light source can be optimized through the shortest light path distance, the luminous flux of the first light beam is further improved, the installation and adjustment are easy, and high optical efficiency is achieved from the two aspects of installation and adjustment and design.

In one embodiment, 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.

In this embodiment, the first light source typically uses a narrow band spectrum, and the narrow bandwidth limits the amount of illumination light in the spectral range of the first light source, e.g., blue, green, and red light sources. The short-wave band light source can be a purple light source and the like.

In this embodiment, the narrow-band light source may be understood that the first light beam emitted by the first light source is a narrow-band spectrum itself, for example, the first light source is an ultraviolet light source (UV _ LED) and has a bandwidth of less than or equal to 20nm, or the first light beam emitted by the first light source is not a narrow-band spectrum itself, but is filtered by the optical filter, so as to obtain a narrow-band spectrum, for example, the first light source is a green light source (G _ LED) having a bandwidth of about 100nm, and a narrow-band green light of less than or equal to 50nm is obtained after narrow-band filtering.

In this embodiment, since the transmittance of the short-wavelength band in the light guide module is lower than that of the long-wavelength band in the light guide module, the light quantity of the short-wavelength spectrum in the endoscope illumination is likely to be insufficient.

It should be noted that this embodiment only exemplifies several types of first light sources commonly used in the medical field, and does not specifically limit the first light source of the present application, and any light source with insufficient luminous flux on the tissue under test may be used as the first light source.

Fig. 2 is a schematic diagram of a second structure of the light source device in an embodiment, and 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, configured to reflect and/or transmit a 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 a first reflected light.

In this embodiment, if the first light combining element 201 and the second light combining element are dichroic mirrors, a first included angle between the second light combining element and the first light combining element 201 is an included angle between the dichroic mirrors; if the first light combining element 201 and the second light combining element are light combining prisms, a first included angle between the second light combining element and the first light combining element 201 is an included angle between 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, and a first light source 101 and a second light source, namely a light source 1021, a light source 1022 and a light source 1023. 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 violet to blue region band, and the light source 1021, the light source 1022 and the light source 1023 are a blue light source B-LED emitting B light in a blue band, a green light source G-LED emitting G light in a green band, and a red light source R-LED emitting R light in a red band, respectively, wherein a peak wavelength of the UV light emitted from the UV _ LED is smaller than a peak wavelength of the B light emitted from the B-LED.

The hemoglobin is characterized by strong absorption in the 405-415nm band spectrum, and is preferably a UV-LED with a peak wavelength of 405-415nm, wherein the wavelength range of the UV-LED is preferably narrow band, the bandwidth of the UV-LED is about 20nm, and the UV-LED is used for depicting the blood vessel morphology near the superficial layer or near the superficial layer according to the characteristics of high scattering and strong absorption.

The light source 1021 (blue light source) preferably has a peak wavelength of 430-460nm, further preferably 430-450nm, and a difference between the reflectance of the superficial blood vessels and the reflectance of the mucosa forms a distinction between the two on the observation image, and the wavelength range thereof is preferably narrow band, and the bandwidth thereof is about 20nm.

Generally, a narrow-band filter is required to be arranged in a collimation light path of a UV _ LED or a B _ LED to meet the bandwidth requirement of the UV _ LED or the B _ LED;

for the light source 1022 (green light source), it preferably has a peak wavelength of 530 to 560nm, and its bandwidth can be selected to be a broad band, such as a bandwidth of about 100nm; preferably, the light source 1022 may be a fluorescent G _ LED that emits green light by exciting a phosphor by a blue LED, preferably, the blue LED has blue excitation light with a peak wavelength of 410 to 440nm, the phosphor is excited by the blue excitation light to generate green light, a small amount of the blue excitation light is directly transmitted without being absorbed by the phosphor, that is, the light source 1022 contains a small amount of the blue excitation light in addition to the green band spectrum, and the fluorescent green LED more easily realizes high output light power than an LED that emits green light by itself.

Light source 1023 (a source of red light), preferably with 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 an example, fig. 4 is a first transmittance spectrum of the dichroic mirrors in one embodiment, the dichroic mirror shown in fig. 4 is referred to as the first light combining element 201, and the first light combining element 201 has a short-wavelength pass characteristic of a transition region with a wavelength of about 410-430nm, and can reflect the spectral components of the light beams of the light source 1021, the light source 1022 and the light source 1023, which are higher than 420nm and lower than 420nm of the first light source 101.

Fig. 5 is a second transmittance spectrum of the dichroic mirror in one embodiment, the dichroic mirror shown in fig. 5 is referred to as a second light combining element 2021, the second light combining element 2021 has a short wavelength pass characteristic in the transition region having a wavelength of about 460-480nm, the spectral components in the beam of the reflected light source 1022 are higher than 470nm and in the beam of the transmitted light source 1021 are lower than 470 nm.

Fig. 6 is a third transmittance spectrum of a dichroic mirror in an embodiment, the dichroic mirror shown in fig. 6 is referred to as a second light combining element 2022, the second light combining element 2022 has a long wavelength pass characteristic in a transition region having a wavelength of about 590-610nm, and reflects spectral components of below 600nm in the light beam of the light source 1021 and the light source 1022 and transmits light of the light source 1023 above 600nm in the light beam.

In this embodiment, the first light combining element 201 and each of the second light combining elements are combined to obtain a combined light beam A1 by the second light combining element 2021 transmitting the light beam emitted from the light source 1021 and reflecting the light beam emitted from the light source 1022; 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 from the first light source 101 and reflects the combined light beam A2 to form a first combined light including the output spectral components of the first light source 101, the light source 1021, the light source 1022 and the light source 1023, so that the light guide module 800 transmits the first combined light to the tissue under measurement. The light sources finally obtain mutually independent spectrum components through the first light combination element 201 and the second light combination element, wherein the spectrum components are a purple spectrum less than or equal to 410nm, a blue spectrum more than 410nm and less than 470nm, a green spectrum more than 470nm and less than 600nm and a red spectrum more than 600 nm.

In this embodiment, the light source 1021 (blue light source), the light source 1022 (green light source), and the light source 1023 (red light source) can be mixed in a specific ratio to output a general white light illumination satisfying the requirement for generating the contour image of the surface 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 is used for the emphasized observation of superficial and middle layer blood vessels; the common white light illumination and the special light illumination are mixed, namely, the spectral components of the first light source 101 (ultraviolet light source) or the light source 1021 (blue light source) in the common white light illumination are properly improved, and the image which gives consideration to the whole outline of the surface tissue and the emphasized observation of the blood vessel is obtained.

Further, the light combining module further includes at least one second light combining element, and in addition to the second structural schematic diagram of the light source device provided in fig. 2, in the embodiment of the present application, a light combining sequence between the light sources may be changed, and the light source device may be adjusted in the length and width directions to achieve an optimal spatial layout, as shown in fig. 7, compared with the light source device shown in fig. 2 in the embodiment, the length of the light source device is decreased in the horizontal direction as a whole, and the length of the light source device is increased in the vertical direction. 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 is referred to as a second light combining element 2023, it can be known that the second light combining element 2023 has a short wavelength pass characteristic of a transition region having a wavelength of about 590 to 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 a dichroic mirror, referred to as second light-combining element 2024, shown in fig. 9 in one embodiment. As shown in fig. 9, the second light combining element 2024 has a long wavelength pass characteristic of a transition region with a wavelength of about 460-480nm, and the light beams of the transmission light source 1022 (green light source) and the light source 1023 (red light source) have a spectral component larger than 470nm, and the light beam of the reflection light source 1021 (blue light source) has a spectral component smaller than 470 nm.

From the first transmittance spectrum of the first light combining element 201 in fig. 4, it can be seen that the first light combining element 201 has a short-wavelength pass characteristic with a transition region wavelength of about 410-430 nm. The first light combining element 201 reflects a light beam higher than 420nm among 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 lower than 420nm of the first light source 101. With reference to fig. 3, fig. 8 and fig. 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 finally obtain mutually independent spectrum components, which are respectively a violet spectrum less than or equal to 420nm, a blue spectrum greater than 420nm and less than 470nm, a green spectrum greater than 470nm and less than 600nm, and a red spectrum greater than 600 nm.

It should be noted that the present embodiment is only a possible configuration of the light source device, and is not limited to the above implementation. And each light source is adjusted, replaced or added according to the target observation requirement, and is correspondingly adjusted 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 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; and a third included angle between the second light combining elements and the optical axis of the second light combining elements is greater than or equal to a fourth preset angle and less 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 different arbitrarily; the second preset angle may also be equal to the fourth preset angle, and the second preset angle may also be different from the fourth preset angle. Likewise, the third predetermined angle may be equal to the fifth predetermined angle, or may be different from the fifth predetermined angle. Alternatively, the third preset angle and the fourth preset angle are the same.

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

Further, a 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, and the first preset angle may be 10 degrees, 20 degrees, and the like, wherein, preferably, the first preset angle is about 0 degree, that is, each second light combining element and the first light combining element are spatially arranged in parallel or tend to be parallel to each other, so that interference between each second light combining element and the first light combining element in an assembling space is avoided, and the structure is compact while the assembling 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 guide module 800, and the optical path space can be set with an optical filter to realize narrow-band light observation of the first light source 101.

Furthermore, 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 narrow-band filtering is performed on the second light beam emitted by the second light source 1021 or/and the second light source 1023, so as to realize narrow-band light observation of the second light source 1021 or/and the second light source 1023.

Fig. 10 is a schematic diagram of a fourth structure of the light source device in an embodiment, and 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 change 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 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 collimating lens 203 may be disposed between the first light source 101 and the first light combining element 201, so as to convert the first light beam into a parallel light beam and enter the first light combining element 201, a collimating lens 203 may be disposed between each second light source 102 and the corresponding second light combining element 202, so as to convert the second light beam into a parallel light beam and enter the second light combining element 202, and the light path integration may be completed by using light combining elements such as dichroic mirrors.

Fig. 11 is a schematic diagram illustrating a fifth structure of the light source device according to an embodiment, and as shown in fig. 11, the light source device further includes a light guide 209; the light guide member 209 is provided at least one of the following positions; the light guide 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 guide 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 guide component 209 is disposed between the first light combining component and the light guide module, and is configured to transmit the first combined light to the light guide module.

The light guide component 209 may be a light guide bundle composed of a plurality of optical fibers, or a light guide rod, or a combination of the light guide bundle and the light guide rod. The size of the light incident surface of the light guide rod is larger than or equal to that of the light emergent surface, and when the size of the light incident surface of the light guide rod is larger than that of the light emergent surface, the light guide rod is a conical light guide rod.

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, light guide fibers or/and light guide rods; and 60 is a light guide component, which is arranged on the first light combination component and the light guide module, specifically a light guide rod or/and a light guide fiber.

In this embodiment, the light guide components 209 are 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, and specifically, the first light beam emitted by 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, the light guide member 209 may be further disposed between the first light combining element 201 and the light guide module 800, for transmitting the first combined light to the light guide module 800. Specifically, the light guide member 209 is disposed between the focusing lens 207 and the light guide module 800.

In this embodiment, the first light source 101 and the second light source 102 can be changed from a fixed position to any other optimized spatial position according to the free bending characteristic of the light guide bundle (light guide fiber), so that the first light source 101 and the second light source 102 can obtain better heat dissipation effect; further, on one hand, the light guide rod or the tapered light guide rod has a light-equalizing effect, and on the other hand, the tapered light guide rod transforms the light-emitting area and the light-emitting angle of the light beam, so as to output the light emitted by the first light source to the subsequent first light combining element 201 with higher optical efficiency, or to input the first combined light output by the first light combining element 201 to the subsequent light guide module 800 with higher optical efficiency; alternatively, the light guide member 209 may be combined with a light guide bundle (light guide fiber) or a light guide rod to achieve both effects.

Fig. 12 is a schematic diagram illustrating a sixth structure of the light source device in an embodiment, and as shown in fig. 12, the light combining module further includes a first filter 205 and/or a second 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 first target wavelength 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 second target wavelength band of the second light beam.

In the embodiment, the first filter 205 is disposed between the first light source 101 and the first light combining element 201, and the second filter 206 is disposed between the second light source 102 and the second light combining element 202. Specifically, the first filter 205 may be disposed between the collimating lens 203 and the first light combining element 201. Similarly, the second 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 filter 205 is disposed between the first light source 101 (ultraviolet light source) and the first light combining element 201, and the wavelength range of the first filter is preferably a filter with a narrow band width of about 20nm, so as to obtain a first target wavelength band of 390nm-410nm for drawing the blood vessel morphology near the superficial layer or near the superficial layer.

Or/and, as shown in fig. 12 above, the second light source 102 (blue light source) preferably has a peak wavelength of 430-460nm, so that 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 wavelength band of 430-450nm, and the difference between the surface blood vessels and the mucosa reflectivity forms a distinction between the two on the observed image.

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

In this embodiment, the second light source 102 (green light source) preferably has a peak wavelength of 530-560nm, and its bandwidth can be chosen 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 by a blue LED, preferably, the blue LED has blue excitation light having a peak wavelength of 410 to 440nm, the phosphor is excited by 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, that is, the emission spectrum of the second light source 102 (green light source) contains a small amount of the blue excitation light in addition to the spectrum of the green band, and the fluorescent type green LED more easily realizes high output optical power than an LED that emits green light by itself.

In this embodiment, a second optical filter is disposed between the second light source and the second light combining element, and an optical axis of the second light source is parallel to an optical axis of the output light of the light guiding module, so that the second optical filter is disposed to facilitate the optical axis direction of the second light source to pull open the optical path space; if no second optical filter is 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 perpendicular, and the setting is carried out according to the actual situation; 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, and 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, the focusing lens 207 converges the first combined light, a focused light beam with a certain aperture angle β is formed at the light outlet, and the focused light beam is coupled into the light guiding module 800.

Fig. 13 is a schematic diagram illustrating a seventh structure of the light source device in an embodiment, as shown in fig. 13, the light combining module further includes at least one luminous flux measuring module 208; the light flux measuring module 208 comprises a beam splitter 2081 and a photoelectric sensor 2082 corresponding to the beam splitter 2081; the beam splitter 2081 is arranged between the first light source 101 and the first light combining element 201, and is used for splitting and reflecting the first light beam to obtain a third light beam, and the third light beam enters 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; and a photosensor 2082 for detecting the luminous flux of the third light beam and/or the fourth light beam.

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

In this embodiment, when beam splitter 2081 and place optical axis present certain contained angle setting, preferably, can be 50 ~ 70 contained angle, it disposes to tend to the parallel with beam splitter 2081 and the first optical element 201 that closes that corresponds, if first optical element 201 and optical axis contained angle 45, beam splitter 2081 and optical axis contained angle 60, the two is 15 contained angles, the space setting who matches photoelectric sensor 2082 obtains optimal spatial layout, further promotes assembly manufacturability and compact structure. It should be noted that, when the beam splitting mirror 2081 performs the beam splitting process, the light splitting ratio of the beam splitting mirror 2081 is less than or equal to 10%, on one hand, enough detection light quantity is obtained, and on the other hand, the reduction of the light flux caused by the excessive reduction of the effective illumination light quantity entering the subsequent light path for integration is avoided.

In this 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 refer to the setting of the beam splitter 2081 disposed between the first light source 101 and the first light combining element 201, and is used for performing beam splitting reflection on the second light beam to obtain a fourth light beam, and the fourth light beam is incident on the photoelectric sensor 2082 corresponding to the beam splitter 2081; and a photosensor 2082 for obtaining a detected light amount of the fourth light beam.

Optionally, the beam splitter 2081 in this embodiment may also be replaced with a spectroscopic plate or other optical elements with beam splitting characteristics, and the photosensor 2082 may be a Photo-Diode (PD) or may be replaced with other types of light flux measuring components, which is not limited in this embodiment of the present application.

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

In the present embodiment, in order to achieve color tone stabilization of the illumination light and high-precision control of the luminance, the third light flux and the fourth light flux incident on the photosensor 2082 may be spectrally filtered. Optionally, a third filter 210 may be disposed in the measurement optical path of the photosensor 2082 (between the beam splitter 2081 and the photosensor 2082) to cut off the non-effective output spectral 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 light beam in the first synthetic light has a first target wavelength band of 390-410nm, i.e. the short wave part of the first target wavelength band of the first light beam is 390nm, the long wave part is 410nm, the third target wavelength band short wave part is 380-400nm, the third target wavelength band long wave part is 400-420nm, i.e. the short wave parts of the first target wavelength band and the third target wavelength band of the first light beam are compared with the long wave part.

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

Fig. 15 is a ninth structural schematic diagram of the light source device in an embodiment, as shown in fig. 15, the light source device further includes a first heat dissipation module 212 and a second heat dissipation module 213 for dissipating heat of 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, the junction temperature (PN junction temperature) is increased due to heat generated during the operation of the LED, and the relevant parameters of each light source, such as the amount of light emitted from the light source and the spectrum, are affected by the operating temperature. An increase in junction temperature leads on the one hand to a shift in the peak wavelength and on the other hand to a decrease in the luminous flux with increasing junction temperature, wherein R _ LED is particularly pronounced. Therefore, heat dissipation control of the light source device of the endoscope is required to maintain the light source device operating in a reasonable temperature range.

In this embodiment, the heat dissipation module includes one or more fans disposed in the light source device or the external space for performing 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, the heat dissipation directions of the first heat dissipation module 212 and the second heat dissipation module 213 are determined 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 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 heat dissipation fan and a second heat dissipation fan are respectively arranged in the first heat dissipation direction S1 and the second heat dissipation direction S2 and are used for integrally dissipating heat of the light source device or/and other components (such as a circuit control component) of the endoscope light source device, and a good comprehensive heat dissipation effect is achieved by using the limited number of fans through an optimized air duct design.

Furthermore, when the light source device is cooled, the heat dissipation module can be combined in various ways to dissipate heat, for example, the light source device is cooled by heat conduction glue, heat conduction fins, heat dissipation fins, water cooling or liquid cooling, and the like.

Fig. 16 is a schematic diagram illustrating a tenth structure of the light source apparatus in an embodiment, and as shown in fig. 16, the light source apparatus further includes a light source expansion interface, and the light source expansion interface is used for connecting the 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 can be reserved on the light source device, and the light source expansion interface is connected to the expansion module 40, so that multiple lighting requirements can be covered in one endoscope light source device at low cost, and more importantly, an interface can be reserved for the following new lighting requirements, and the 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 structure mode is as follows: as shown in fig. 17, at least one light source includes an amber light source 4011, and the light combining module corresponding to the at least one light source includes a third light combining element 4021; the third light combining element 4021 and the third light combining element 4021 are used for transmitting the fifth light beam emitted by the amber light source 4011 to form 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; the second light combining element 202 is configured to reflect and/or transmit the second transmitted light, the second reflected light, and the first remaining second light beam to form a first incident light incident to the first light combining element 201; the first remaining second light beam comprises a second light beam except the second light beam emitted by the second light source 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 optical filter, a light flux measuring module, and the like may be further 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 converted into a parallel light beam by the collimating lens, the third light combining element 4021 transmits the parallel light beam 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 a second reflected light, and the second reflected light, the second transmitted light, and the second light beams other than the second light beam emitted from the second light source 1023 are reflected and/or transmitted by the second light combining elements 202 to form the first incident light entering the first light combining element 201, so that the light beams of the amber light source 4011 combined with the four light sources are expanded and integrated.

In the present embodiment, the spectrum graph of each light source in the light source device of fig. 17 is shown in fig. 18, and L1, L2, L3, L4 and L5 are the spectrum curves 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 the third light combining element in one embodiment, it is known that the third light combining element 4021 has a short pass characteristic with a transition region having a wavelength of about 600nm to about 620nm, and transmits a spectral component lower than 610nm in the amber light source 4011 and reflects a spectral component higher than 610nm in the red light source; as shown in the above figures, the second light combining element 202 has different transition region long-pass or short-pass characteristics. The third light combining element 4021 may transmit the fifth light beam emitted from the amber light source 4011 to form 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 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 by the second light source 1023 corresponding to the third light combining element 4021 to form a first incident light incident on 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 by the first light source to form a first combined light. The collimated light beams of the light sources are reflected and/or transmitted by the first light combining element 201, the second light combining elements 202 and the third light combining element 4021, so that the light source component spectrums are mutually independent, and independent spectrums are obtained, that is, parts with mutually overlapped wavelengths hardly exist, so that the control strategy of the proportion of the light source components in output light is simplified, and the high-precision control of the hue and the luminous flux stability of illumination light is realized.

In this embodiment, amber light source 4011 preferably has a peak wavelength of 590-610nm, hemoglobin spectral absorption coefficient has a large variation range around 600nm, and peak wavelength of light source 1023 (red light source) is located at 620-640nm, and compared with the emission spectrum of amber light source 4011 around 590-610, the emission spectrum of light source 1023 (red light source) has a smaller hemoglobin absorption coefficient and living tissue scattering coefficient, and illumination using amber light source 4011 and light source 1023 (red light source) is favorable for improving visibility of deep blood vessels according to the characteristic that hemoglobin has a difference in absorption and scattering characteristics of amber light source 4011 and light source 1023 (red light source) in output light.

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, while a filter is provided between the photosensor and the beam splitter.

The second structure 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 second incident light entering the fifth light combining element 4023, and transmit the seventh light beam emitted by the second infrared light source 4013 to form third transmitted light; a fifth light combining element 4023, 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 third incident light incident on the second light combining element 202; the second light combining element 202 is used for reflecting and/or transmitting the third incident light and the second residual light beam to form first incident light which is incident to the first light combining element 201; the second remaining second light beam includes a second light beam other than the second light beam emitted from the second light source 1023 corresponding to the fifth light combining element 4023.

In this embodiment, as shown in fig. 20, the expansion 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. Optionally, a collimating lens or the like may be further disposed 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. In particular, a short-wave pass or band-pass filter may be added to the light path of each of the first infrared light source 4012 or/and the second infrared light source 4013, and further, narrow-band characteristics of 800 to 820nm and 920 to 940nm are highlighted, and preferably, a filter having a short-wave pass characteristic with a wavelength of 820nm or less is added to the light path where the fourth optical combining element 4022 and the first infrared light source 4012 are located, and a filter having a band-pass characteristic of 920 to 940nm is added to the light path where the fourth optical combining element 4022 and the second infrared light source 4013 are located.

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

In this embodiment, the first infrared light source 4012 preferably has a wavelength ranging from 800 to 830nm; the second infrared light source 4013 has a longer wavelength than the first infrared light source 4012, preferably, its wavelength ranges from 910 to 950nm. Fig. 22 is a transmittance spectrum of the fourth light combining element in an embodiment, and it is understood that the fourth light combining element 4022 has a long wavelength pass characteristic in a transition region having a wavelength of about 910 to 930 nm. The fourth light combining element 4022 transmits the spectral components of the second infrared light source 4013 higher than 920nm, and reflects the spectral components of the light beam of the first infrared light source 4012 lower than 920nm to form first transmitted light.

In this embodiment, fig. 23 is a transmittance spectrum diagram of the fifth light combining element in one embodiment, and it is known that the fifth light combining element 4023 has a long wavelength pass characteristic with a transition region wavelength of about 790 to 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 the light beam of the light source 1023 (red light source) smaller than 800nm to form third incident light.

In the present embodiment, similarly, as shown in the above-mentioned figures, each second light combining element has different transition region long-wavelength pass or short-wavelength 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-wavelength pass or short-wavelength pass characteristics to form the first incident light incident to 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 by 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 spectra of the light sources are independent from one another, and independent spectra are obtained.

In the present embodiment, it is preferable that each light source is provided with a photosensor for detecting 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, as in the above-described embodiments.

Furthermore, a circuit interface can be arranged on a circuit connected with the light source device, and the circuit interface is used for circuit connection, so that the control of the light source of the expansion module is realized.

It should be noted that, the expansion module can realize, by means of the above expansion or replacement, a plurality of lighting requirements in one endoscope light source device at low cost, and more importantly, the expansion module can be reserved for the following new lighting requirements.

In this embodiment, the general white light mode, the special light illumination mode, and the mixed light mode with white light illumination respectively realize the observation of the overall contour of the observation object, the vessel enhancement observation of the surface layer and the middle layer, and the mixed light observation image with both the overall contour and the vessel enhancement observation; the system has an infrared light observation mode (a first infrared light source and a second infrared light source), and realizes clear observation images of blood vessels and blood flow information in the deep mucosa after ICG which can easily absorb infrared light is intravenously injected; or, inheritably, an interface is reserved for new special light/mixed light lighting.

Fig. 24 is a first schematic view of an endoscope system according to an embodiment, and as shown in fig. 24, the endoscope system includes a light guide module 800, an illumination module 200, a camera module 300, a processing module 400, a display module 700, and the light source apparatus 100 according to any of the embodiments described above; the light source device 100 is configured to transmit the first synthesized light to the illumination module 200 through the light guide module 800; an illumination module 200 for diffusing the first synthetic light transmitted to the illumination module 200 to the tissue to be measured; 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 a display module 700 for displaying the image after the signal processing.

In this embodiment, as shown in fig. 24, the light source device transmits the first synthesized light to the illumination module 200 through the light guide module 800, the illumination module 200 may be an illumination lens, the first synthesized light transmitted to the illumination lens is diffused to the tissue to be measured through the illumination lens to provide illumination light with sufficient brightness for the tissue to be measured, the camera module 300 acquires an image of the tissue to be measured, transmits the image of the tissue 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 transmits the processed image to the display module 700, so that the display module 700 displays the processed image.

In one embodiment, the light source device comprises a photosensor; a photosensor for detecting luminous flux of each light source at a preset drive current; and 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 a difference value between the detection signal and a preset detection signal.

In this embodiment, the light source device includes a photosensor, and the installation position of the photosensor can be referred to the above embodiment, and feedback control of the driving current (or voltage) of each light source is realized by using the measurement result of the photosensor.

Specifically, the preset luminous flux detection signal is used for calibrating the detection signal of the photoelectric sensor, and the corresponding relation among different driving currents, different detection signals and different luminous fluxes of the N light sources is established. During calibration, the driving current I1-IN of each light source 11-1N is changed or increased point by point, a beam splitter IN a collimation light path of each light source 11-1N splits and emits light beams onto a 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, the luminous flux signals phi 1-phi N are converted into detection signals L1-LN, and the corresponding relation between the driving current and the detection signals and the luminous flux is obtained as Ii: L1: phi I (I = 1-N). And obtaining a relation curve of the three through multi-point testing so as to finish 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, the driving current of the light source device is adjusted according to the difference between the detection signal and the preset luminous flux detection signal, including if the actual detection signal is smaller than the preset detection signal, the driving current corresponding to the light source is correspondingly increased; and if the actual detection signal is greater than the preset detection signal, correspondingly reducing the driving current corresponding to the light source.

In the embodiment, because the hue stability of the illumination light has a great influence on the observation of the pathological tissue, the brightness of the illumination light has an important influence on the strength of an image signal, namely the definition of an output image, and the feedback control of the output light quantity of each light source can be accurately realized by the real-time signal detection of the photoelectric sensor and the combination of a calibration result, so that the hue stability and the light flux stability 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 the endoscope system in one embodiment, and as shown in FIG. 25, the endoscope system 1 further includes 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 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 synthesized light according to the light mode in the input command.

In the present embodiment, the ordinary white light mode is that illumination light of a white color tone is output by proportional control of each light source component, and an overall contour image of a living tissue is acquired by an endoscope system; the special light mode is different from the common white light mode, at least comprises a special light source, such as a purple light source, a blue light source or a green light source and the like, and according to different incident depths of different wavelengths in the living body tissue, namely the longer the wavelength is, the deeper the incident depth of the living body tissue is, the contrast is formed by the high absorption of blood vessels with different depths in the surface layer and the middle layer and the low absorption of mucosa, 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 partial spectrum of the special light mode and partial spectrum of the common white light mode, obtains spectral output different from the common white light mode and the special light mode, and realizes an image which gives consideration to the whole contour of the living tissue and the vessel emphasis observation 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 command of any one of the normal white light mode, the special light mode and the mixed light mode is input into the input module 600, and the control module 500 controls the light mode of the first synthesized light based on the light mode in the input command, thereby completing the switching among the 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 further adjust a driving current (or voltage) of each light source, adjust a variation of an output luminous flux of each light source, or change the luminous flux by adjusting a Pulse Width Modulation (PWM); or controlling the operating states of the light source device 100 and the camera module 300, for example, controlling the output luminous flux ratio of each light source according to a preset luminous flux ratio to achieve a corresponding illumination light mode, adjusting the output luminous flux of each light source according to the bright and dark leveling bodies imaged by the camera module 300, and implementing real-time feedback control of each light source component in the output illumination light by arranging a luminous flux measurement module in the light source device, thereby maintaining the tone stability and luminous flux stability of the illumination light, providing the illumination light required by the camera module 300, and simplifying the light quantity control strategy.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A light source device is characterized by comprising at least two light sources and a light combining module, wherein the light source device is connected with a 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 combining element is arranged between the light guide module and the first light source and is used for transmitting the first light beam emitted by the first light source to form first transmitted light;

the first light combining element is further configured to reflect at least one second light beam emitted by at least one second light source to form first reflected light, and combine the first reflected light and the first transmitted light to form first combined light, so that the light guide module transmits the first combined light to the tissue to be tested.

2. The light source device according to claim 1, wherein an optical path distance between the first light source and the light entrance of the light guide module is smaller than or equal to an optical path distance between the second light source and the light entrance.

3. The light source device according to claim 1, wherein 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.

4. 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;

5. The light source device according to claim 4, wherein a second included angle between the first light combining element and the 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; and a third included angle between the second light combination element and the optical axis of the second light combination element is greater than or equal to a fourth preset angle and less than or equal to a fifth preset angle.

6. The light source device according to any one of claims 1 to 5, further comprising a light guide member; the light guide member is disposed at least one of the following positions;

the light guide component is arranged between the second light source and the corresponding second light combining element and is used for transmitting the second light beam to the second light combining element;

the light guide component is arranged between the first light combining component and the light guide module and used for transmitting the first synthetic light to the light guide module.

7. The light source device according to claim 4 or 5, wherein the light combining module further comprises a collimating lens;

The collimating lens is arranged between the second light source and the corresponding second light combining element and is used for converting the second light beam into a parallel light beam to be incident on the second light combining element.

8. The light source device according to claim 4 or 5, wherein the light combining module further comprises a first filter and/or a second filter;

9. The light source device according to claim 8, 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.

10. The light source device according to any one of claims 1 to 5, wherein 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, and is configured to focus the first combined light to obtain a focused light beam.

11. The light source device according to any one of claims 1 to 5, wherein the light combining module further comprises at least one light flux measuring module; the luminous flux measuring module comprises a beam splitter and a photoelectric sensor corresponding to the beam splitter;

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

the third optical filter is arranged between the corresponding beam splitter and the photoelectric sensor and is used for transmitting light beams of a third target waveband and/or a fourth target waveband; the difference between the third target waveband and the first target waveband of the first light beam in the first synthetic light is smaller than a first preset difference threshold value; the difference between the fourth target waveband and the second target waveband of the second light beam in the first synthetic light is smaller than a second preset difference threshold value.

13. The light source device according to claim 9, further comprising a first heat sink module and a second heat sink module for dissipating heat of the light source device; 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.

14. The light source device according to any one of claims 3 to 5, further comprising a light source expansion interface, wherein the light source expansion interface is used for connecting an expansion module; the expansion module comprises at least one light source and a light combining module corresponding to the at least one light source.

15. The light source device according to claim 14, wherein 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;

16. The light source device according to claim 14, wherein 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;

the second light combining element is used for reflecting and/or transmitting the third incident light and the second residual second light beam to form first incident light incident to the first light combining element; the second remaining second light beam comprises a second light beam except the second light beam emitted by the second light source corresponding to the fifth light combining element.

17. An endoscope system comprising a light guide module, an illumination module, a camera module, a processing module, a display module, and a light source device according to any one of claims 1-16;

the camera module is used for acquiring an image of the tested tissue;

18. The endoscopic system of claim 16 wherein said light source device comprises a photosensor;

19. An endoscope system according to claim 17 or 18 and also comprising an input module and a control module;