WO2024114324A1 - Endoscope light source device and endoscope - Google Patents

Abstract

An endoscope light source device and an endoscope. The endoscope light source device comprises a light source unit (1) and a beam shaping unit (2); the light source unit (1) is used for emitting beams of predetermined wavelengths; the beam shaping unit (2) at least comprises a first module (21) and a second module (22); the beam shaping unit (2) is configured to switch the first module (21) or the second module (22) to a light path so as to distribute energy distribution and angle distribution of the beams, so that the energy distribution and the angle distribution of the distributed beams are adapted to different application scenarios, wherein compared with the second module (22), the first module (21) makes the energy distribution of the distributed beams tend to be flat-topped distribution, and the angle distribution of the distributed beams tend to be uniform; and compared with the first module (21), the second module (22) makes the energy distribution of the distributed beams tend to be Gaussian distribution, and the angle distribution of the distributed beams tend to be concentrated.

Description

Endoscope light source device and endoscope

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to application number 202211502703.5, filing date November 29, 2022, and entitled “Endoscopic Light Source Device and Endoscope,” and the contents of which are incorporated herein by reference in their entirety for all purposes.

Technical Field

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

Background technique

In endoscopy, xenon lamps, LEDs and other light sources are currently commonly used. With the advancement of technology in recent years, laser light sources and SLD light sources have been increasingly used in biomedicine. Since the spectrum width of laser light sources or SLD light sources is narrow, when an endoscope is illuminated with a laser light source or SLD light source, it helps to display or diagnose certain lesions separately.

As the main component of the endoscope, the light source device needs to meet the needs of different scenarios. Different scenarios have different distributions of illumination light energy. At present, the lighting schemes of endoscopes are consistent with the energy distribution of the Lambertian body, which is suitable for cavities such as the esophagus and trachea. However, if placed in larger areas such as the stomach or bladder, it will cause a dark field at the edge of the image, which requires post-processing algorithm correction.

Summary of the invention

An object of the present invention is to provide an endoscope light source device and an endoscope, so as to solve the problem that the existing endoscope light source cannot be adapted to different application scenarios.

In order to solve the above technical problems, the present invention provides an endoscope light source device, which includes: a light source unit and a beam shaping unit;

The light source unit is used to emit a light beam of a predetermined wavelength;

The beam shaping unit includes at least a first module and a second module, and the beam shaping unit is configured to switch the first module or the second module to the optical path to distribute the energy distribution and the angle distribution of the light beam so that the energy distribution and the angle distribution of the light beam after distribution are adapted to different Same application scenarios;

Compared with the second module, the first module makes the energy distribution of the allocated light beam more inclined to flat-top distribution, and makes the angle distribution of the allocated light beam more inclined to uniform; compared with the first module, the second module makes the energy distribution of the allocated light beam more inclined to Gaussian distribution, and makes the angle distribution of the allocated light beam more inclined to concentrated;

The first module comprises a first surface facing the light source unit and a second surface away from the light source unit; the first surface is used to refract the edge beam in the light beam inwardly and refract the near-center beam in the light beam outwardly; the second surface is used to refract both the edge beam and the near-center beam inwardly; and/or,

The second module includes a third surface facing the light source unit and a fourth surface away from the light source unit, and the third surface and the fourth surface are both used to refract the edge beam of the light beam inwardly and refract the near-center beam of the light beam inwardly.

Optionally, in the endoscope light source device, the second surface is also used to make the inward refraction angle of the edge light beam greater than the inward refraction angle of the near-center light beam.

Optionally, in the endoscope light source device, the first surface is a Gaussian surface that is concave toward the second surface; the second surface is a composite surface whose edge curvature is greater than the center curvature and is convex toward the side away from the light source unit; and/or,

The third surface is a surface that is concave toward the fourth surface; and the fourth surface is a surface that is convex toward a side away from the light source unit.

Optionally, in the endoscope light source device, the first module and the second module are configured to move in a direction at an angle to the optical path to alternatively enter the optical path or exit the optical path.

Optionally, in the endoscope light source device, the light source unit includes a first light combining component and at least two light source assemblies, each of the light source assemblies emits light of a different predetermined wavelength, and the first light combining component is used to combine the light emitted by all the light source assemblies to form the light beam.

Optionally, in the endoscope light source device, the central wavelength of the light emitted by one of the light source components is 405 nm, and the central wavelength of the light emitted by the other light source component is 638 nm.

Optionally, in the endoscope light source device, the light source unit includes a light source assembly, a focusing member and a speckle elimination assembly; the light source assembly is used to emit light of a predetermined wavelength;

The speckle reduction assembly includes a movable scatterer;

The focusing member is used to focus the light from the light source assembly onto the scatterer;

The beam shaping unit is used to receive the light beam emitted by the scatterer.

Optionally, the endoscope light source device further includes a post-adjustment unit, which is used to adjust and output the light beam allocated by the beam shaping unit.

Optionally, in the endoscope light source device, the rear adjustment unit includes a light homogenizing component; the light homogenizing component includes at least one light homogenizing element, and when the light homogenizing component includes more than two light homogenizing elements, all the light homogenizing elements are arranged axially and/or radially along the optical path.

Optionally, in the endoscope light source device, the rear adjustment unit includes a light guide assembly, and the light guide assembly is in contact and connected with the light homogenizing assembly along the axial direction of the light path.

Optionally, in the endoscope light source device, the rear adjustment unit includes a white light source assembly and a second light combining component, the white light source assembly is used to emit white light, and the second light combining component is used to combine the light beam emitted by the light source unit and the white light emitted by the white light source assembly.

In order to solve the above technical problems, the present invention also provides an endoscope, which includes the endoscope light source device as described above.

In summary, in the endoscope light source device and the endoscope provided by the present invention, the endoscope light source device includes a light source unit and a beam shaping unit; the light source unit is used to emit a light beam of a predetermined wavelength; the beam shaping unit includes at least a first module and a second module, and the beam shaping unit is configured to switch and select the first module or the second module to the optical path to distribute the energy distribution and the angle distribution of the light beam, so that the energy distribution and the angle distribution of the distributed light beam are adapted to different application scenarios; wherein, compared with the second module, the first module makes the energy distribution of the distributed light beam more inclined to a flat-top distribution, and makes the angle distribution of the distributed light beam more inclined to uniform; the Compared with the first module, the second module makes the energy distribution of the allocated light beam more inclined to Gaussian distribution, and makes the angular distribution of the allocated light beam more inclined to concentrated; the first module includes a first surface facing the light source unit and a second surface away from the light source unit; the first surface is used to refract the edge light beam in the light beam inwardly, and refract the near-center light beam in the light beam outwardly; the second surface is used to refract both the edge light beam and the near-center light beam inwardly; and/or, the second module includes a third surface facing the light source unit and a fourth surface away from the light source unit, and the third surface and the fourth surface are both used to refract the edge light beam inwardly, and refract the near-center light beam in the light beam outwardly. The near-center beam is refracted inward.

With such configuration, based on the setting of the beam shaping unit, the first module or the second module is switched and selected into the optical path to distribute the energy distribution and angle distribution of the light beam emitted from the light source unit, so that the energy distribution and angle distribution of the distributed light beam are adapted to different application scenarios, thereby effectively overcoming the problem of the single applicable scenario (mainly applicable to smaller spaces) of the existing endoscope light source.

BRIEF DESCRIPTION OF THE DRAWINGS

Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

FIG. 1 is a schematic diagram of an endoscope light source device according to an embodiment of the present invention.

FIG. 2 is a diagram showing superimposed spectra of the light source of the endoscope according to an embodiment of the present invention.

FIG. 3 is a light spot of the lighting space in a large space scene according to an embodiment of the present invention.

FIG. 4 is a diagram showing energy distribution of light in a large space scene according to an embodiment of the present invention.

FIG. 5 is a light spot of the lighting space in a small space scene according to an embodiment of the present invention.

FIG. 6 is a diagram showing energy distribution of light in a small space scene according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a first module according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a second module according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of laser illumination without uniform light according to an embodiment of the present invention.

FIG. 10 is a schematic diagram of laser illumination with uniform light according to an embodiment of the present invention.

FIG. 11 is a schematic diagram of the arrangement of light homogenizing elements along the light path according to an embodiment of the present invention.

FIG. 12 is a schematic diagram of the arrangement of light homogenizing elements along the axial direction of the optical path according to an embodiment of the present invention.

In the attached figure:
1-light source unit; 11-light source assembly; 12-first light combining component; 13-focusing component; 14-speckle eliminating component;
141-scatterer; 142-driving element; 2-beam shaping unit; 20-lens; 21-first module; 211-first surface; 212-second surface; 212a-first area; 212b-second area; 22-second module; 221-third surface; 222-fourth surface; 3-rear adjustment unit; 31-light homogenizing component; 311-light homogenizing element; 32-light guide assembly; 33-white light source assembly; 34-second light combining element; 4-collimating element.

Detailed ways

In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

As used in the present invention, the singular forms "one", "an", and "the" include plural objects, the term "or" is generally used to include the meaning of "and/or", the term "several" is generally used to include the meaning of "at least one", and the term "at least two" is generally used to include the meaning of "two or more". In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" as well as "proximal end" and "distal end" generally refer to two corresponding parts, which include not only endpoints. In addition, as used in the present invention, "installed", "connected", "connected", and one element "set" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements can be direct or indirect through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below or one side of another element, unless the content clearly indicates otherwise. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the figures, with the upward or upper direction toward the top of the corresponding figure, and the downward or lower direction toward the bottom of the corresponding figure.

The object of the present invention is to provide an endoscope light source device and an endoscope to solve the problem that the existing endoscope light source cannot be adapted to different application scenarios.

Referring to FIG. 1 , an embodiment of the present invention provides an endoscope light source device, which includes: a light source unit 1 and a beam shaping unit 2; the light source unit 1 is used to emit a light beam of a predetermined wavelength; the beam shaping unit 2 includes at least a first module 21 (see FIG. 7 ) and a second module 22 (see FIG. 8 ), and the beam shaping unit 2 is configured to switch the first module 21 or the second module 22 to the optical path to distribute the energy distribution and the angle distribution of the light beam, so that the energy distribution and the angle distribution of the distributed light beam are adapted to different applications. Usage scenario; wherein, compared with the second module 22, the first module 21 makes the energy distribution of the allocated light beam more inclined to flat-top distribution, and makes the angular distribution of the allocated light more inclined to uniform; compared with the first module 21, the second module 22 makes the energy distribution of the allocated light beam more inclined to Gaussian distribution, and makes the angular distribution of the allocated light more inclined to concentrated.

In this configuration, based on the setting of the beam shaping unit 2, the first module 21 or the second module 22 is switched and selected into the optical path to distribute the energy distribution and angle distribution of the light beam emitted from the light source unit 1, so that the energy distribution and angle distribution of the distributed light beam are adapted to different application scenarios, such as: the application scenario includes at least a large space scene and a small space scene, the first module 21 is adapted to the large space scene, and the second module 22 is adapted to the small space scene; that is, the endoscope light source device of this embodiment can be adapted to different application scenarios, effectively overcoming the problem that the existing endoscope light source has a single applicable scenario and cannot be adapted to multiple application scenarios.

In conjunction with FIG. 1 , the endoscope light source device provided in this embodiment is described below. The light source unit 1 includes a light source assembly 11, which is a laser light source or an SLD light source, and is used to emit light of a predetermined wavelength. In some embodiments, the light source unit 1 may include only one light source assembly 11, in which case the output end of the light source assembly 11 is the output end of the light source unit 1. Optionally, in other embodiments, the light source unit 1 includes a first light combining member 12 and at least two light source assemblies 11, each of which emits light of a different predetermined wavelength, and the first light combining member 12 is used to combine the light emitted by all light source assemblies 11 to form a light beam. Since blood vessels and tissues have different absorption properties for light of different wavelengths, different pathological tissues can be enhanced and displayed by using at least two light source assemblies 11 of different wavelengths. It can be understood that the shorter the wavelength of light, the weaker its penetration ability, and the weaker the penetration ability, the light is not easy to reach the deep layer of the mucosa, and then the imaging lens cannot image the deep layer of the mucosa, thereby reducing the interference of the imaging of the deep layer of the mucosa on the imaging of the shallow layer, making the imaging of the shallow layer of the mucosa clearer. In addition, some diseased tissues can strongly absorb light of specific wavelengths. For example, some diseased tissues have more blood vessels, and hemoglobin can strongly absorb light of a certain wavelength, thereby highlighting the location of the diseased tissue. The inventors have found that 450nm light can highlight shallow blood vessels. 405nm light can highlight shallower blood vessels (such as surface capillaries). Therefore, the central wavelength of light emitted by at least one light source component 11 is 405nm. On the other hand, light with a central wavelength of 405nm is mainly blue-violet light, and using such light alone is not conducive to observation. Therefore, the central wavelength of light emitted by at least another light source component 11 is 638nm. Light with a central wavelength of 638nm is mainly red light, which is transmitted through After the first light combining element 12 combines the light of 405 nm, the color temperature and the color rendering index can be effectively improved.

In the exemplary embodiment shown in FIG1 , the light source unit 1 includes three light source components 11, and the central wavelengths of the light emitted by the light source components 11 are 405 nm, 450 nm and 638 nm, respectively. Please refer to FIG2 , and it can be understood that by adjusting the energy proportion of at least one of 405 nm, 450 nm and 638 nm, the color temperature and color rendering index of the light output by the combined light source unit 1 can be adjusted to suit the habits of different physicians. In particular, by adjusting the energy proportion of 450 nm light, the color temperature can be adjusted; by adjusting the energy proportion of 638 nm light, the color rendering index can be adjusted.

Please continue to refer to Figure 1. Along the optical path, the light beam emitted by the light source unit 1 enters the beam shaping unit 2. The purpose of the beam shaping unit 2 is to shape the light beam emitted by the light source unit 1, that is, to redistribute the energy distribution and angle distribution of the light beam so that the output light beam can adapt to different application scenarios. In an exemplary embodiment, different application scenarios include at least a large space scene and a small space scene; it should be noted that the large space scene and the small space scene here are two relatively two application scenarios. For example, the large space scene can be a cavity with a large space such as the stomach, and the small space scene can be a narrow cavity such as the intestine and trachea. In some embodiments, the large space scene refers to the inner size of the cavity (referring to the cross-sectional size of the cavity along the direction perpendicular to the endoscope) is not less than 5 times the outer diameter of the endoscope, preferably not less than 8 times; the small space scene refers to the inner size of the cavity is less than 5 times the outer diameter of the endoscope, preferably less than 3 times. The inventors have found that the requirements of the endoscope for the light source are different in the two different application scenarios of the large space scene and the small space scene.

In a large space scene, the energy distribution of the light beam should be more inclined to uniform distribution, and the angular distribution of the light beam should be more inclined to expand outward. Figures 3 and 4 show the light spot of the lighting space in a large space scene and the energy distribution of light. In Figure 4, curve C1 is the illumination curve along the horizontal axis (x-axis) in Figure 3, and curve C2 is the illumination curve along the vertical axis (y-axis) in Figure 3. It can be seen from Figure 4 that the energy distribution of the light beam presents a roughly platform area near the center of the light spot, forming a flat-top distribution. The entire light spot is relatively uniform, which is suitable for the lighting needs of large spaces.

In a small space scene, the energy distribution of the light beam should be more inclined to Gaussian distribution, and the angular distribution of the light beam should be more inclined to concentrated. Figures 5 and 6 show the illumination diagram of the lighting space in a small space scene and the energy distribution of light. In Figure 6, curve C3 is the illumination curve along the horizontal axis (x-axis) in Figure 5, and curve C4 is the illumination curve along the vertical axis (y-axis) in Figure 5. It can be seen from Figure 6 that the energy distribution of the light beam presents a peak area near the center, and the energy distribution of the light beam remains high. The light energy is more concentrated in the center, and finally the light spot is darker on both sides and brighter in the center, which is suitable for lighting narrow cavities.

However, the energy distribution of the light beam emitted by the general light source unit 1 is mainly Gaussian distribution. To meet different application scenarios, it is necessary to shape and redistribute the energy distribution and angle distribution of the light beam emitted by the light source unit 1. Therefore, the beam shaping unit 2 is configured to adapt the energy distribution and angle distribution of the distributed light beam to the required application scenario through the switching of the first module 21 and the second module 22.

Optionally, please refer to FIG. 7 , the first module 21 includes a first surface (i.e., incident surface) 211 facing the light source unit 1 and a second surface (i.e., exit surface) 212 away from the light source unit 1. Optionally, the first module 21 includes a lens 20, which is arranged perpendicular to the light path, and the side of the lens 20 facing the light source unit 1 is the first surface 211, and the side away from the light source unit 1 is the second surface 212. Of course, in some other embodiments, the first module 21 may include more than two lenses to form a lens group for multi-level refraction of the light beam, and the side of the lens group facing the light source unit 1 is the first surface 211, and the side farthest from the light source unit 1 is the second surface 212, and the present invention is not limited to this. In particular, the orientation of the first surface 211 and the second surface 212 of the first module 21 refers to the state after the first module 21 is switched to the light path. Similarly, the directions of the third surface 221 and the fourth surface 222 of the second module 22 described below also refer to the state after the second module 22 is switched to be selected in the optical path, which can be understood by reference.

Optionally, please refer to Fig. 8, the second module 22 includes a third surface (i.e., incident surface) 221 facing the light source unit 1 and a fourth surface (i.e., exit surface) 222 away from the light source unit 1. Similarly, the second module 22 may include one lens, or may include more than two lenses to form a lens group, the principle of which is similar to that of the first module 21 and will not be repeated here.

As shown in Figure 7, the first module 21 is selected to switch to the optical path. At this time, it is suitable for large space scenes. The first surface 211 is used to refract the edge beam in the light beam inward and refract the near-center beam in the light beam outward; the second surface 212 is used to refract both the edge beam in the light beam and the near-center beam in the light beam inward; for better applicability, preferably, the angle of inward refraction of the edge beam is greater than the angle of inward refraction of the near-center beam. With such a configuration, the high-energy light in the middle can be diverged to the edge, which is beneficial to uniform illumination of the illumination field. The edge beam and the near-center beam in the light beam need to be explained here: in the light beam incident on the beam shaping unit 2, the edge beam refers to the portion of the light beam that is relatively far away from the optical axis (i.e., the central axis of the light beam), and the near-center beam refers to the portion of the light beam that is relatively close to the optical axis. It can be understood that Theoretically, the central light beam passing through the optical axis is perpendicular to the lens (or lens group), and will not produce angular deflection after passing through the lens (or lens group), while the near-central light beam close to the optical axis and the light beam far from the optical axis will produce angular deflection due to refraction after passing through the lens. The inward refraction here means that the light beam is deflected in the direction close to the optical axis when passing through the exit surface of the lens (i.e., the interface between the lens and the air). It can also be understood that the outward refraction of the light beam means that the light beam is deflected in the direction away from the optical axis when passing through the exit surface of the lens (i.e., the interface between the lens and the air).

In an exemplary embodiment, the first surface 211 is a Gaussian surface that is concave toward the second surface 212; the second surface 212 is a composite surface whose edge curvature is greater than the center curvature and convex toward the side away from the light source unit 1. It should also be noted that the Gaussian surface here should be understood in a broad sense, and is not necessarily strictly limited to a surface that conforms to a Gaussian function, but should be understood as a shape that is roughly close to a Gaussian surface. The second surface 212 is a composite surface whose edge curvature is greater than the center curvature, which means that the second surface 212 at least includes a first area 212a located at the edge and a second area 212b located at the center, and the curvature of the first area 212a is greater than the curvature of the second area 212b. In particular, the second area 212b can be a plane, and its curvature can be 0. With such a configuration, the edge light beam refracts inward when passing through the first surface 211; the near-center light beam refracts outward when passing through the first surface 211, and the energy at the center of the light spot is initially diffused outward. Furthermore, when the edge light beam passes through the first area 212a of the second surface 212, it is refracted inward at a relatively large angle to ensure that the edge brightness is not too low, and when the near-center light beam passes through the second area 212b of the second surface 212, it is refracted inward at a relatively small angle or directly transmitted to ensure that the center brightness is not too high, and the energy of the light spot is evenly adjusted. As a result, the light emitted by the light source unit 1 is shaped to be relatively uniform after passing through the first module 21, and the effect of uniform illumination of the entire illumination field can be achieved, and the illumination light spot becomes a relatively evenly distributed flat-top light spot.

Therefore, when the first module 21 is selected to switch to the optical path, the light beam emitted by the light source unit 1 changes to a flat-top distribution after passing through the first module 21, and the illumination spot is more uniform, which is suitable for the illumination of a wide cavity, that is, suitable for a large space scene.

As shown in FIG8 , when the second module 22 is selected to switch to the optical path, which is suitable for a small space scene, the third surface 221 and the fourth surface 222 are both used to refract the edge beam inward and the near-center beam inward.

In an exemplary embodiment, the third surface 221 is a surface that is concave toward the fourth surface 222; and the fourth surface 222 is a surface that is convex toward the side away from the light source unit 1. Preferably, the third surface 221 and/or the fourth surface 222 are spherical. It should be noted that the spherical surface here should be understood in a broad sense and is not necessarily strictly limited to a spherical surface in a geometric sense, but should be understood as a shape roughly close to a spherical surface. For example, in some embodiments, the third surface 221 and the fourth surface 222 are set to a parabola, an ellipsoid or a hyperboloid, etc. that are close to a spherical surface, which should be understood as a spherical surface that can refract the light beam inward. Even in some embodiments, the third surface 221 and the fourth surface 222 are set to a polyhedron close to a spherical surface, which can also achieve a similar effect and should also be understood as constituting a spherical surface that can refract the light beam inward.

Therefore, when the second module 22 is selected to switch to the optical path, the light beam emitted by the light source unit 1 basically maintains a Gaussian distribution or close to a Gaussian distribution after passing through the second module 22, and the illumination spot is darker on both sides and brighter in the center, which is suitable for narrow cavity lighting, that is, suitable for small space scenes.

It should be noted that the above-mentioned limitations on the features of the first module 21 and the second module 22 can be set selectively. For example, when the first surface 211 and the second surface 212 of the first module 21 meet the above-mentioned beam refraction effect, the second module 22 does not necessarily also set the third surface 221 and the fourth surface 222 to meet the above-mentioned beam refraction effect. In one example, the second module 22 can be, for example, a plane lens. Obviously, the shaping effect of the first module 21 on the beam at this time can also make the energy distribution of the distributed beam more inclined to a flat-top distribution, and make the angular distribution of the distributed beam more uniform, relative to the second module 22. Similarly, when the second module 22 meets the above-mentioned beam refraction effect, the first module 21 may not meet it. Of course, preferably, the first module 21 and the second module 22 meet the above-mentioned beam refraction effect at the same time.

Optionally, the first module 21 and the second module 22 are configured to move in a direction at an angle to the optical path to selectively enter or exit the optical path. In practice, depending on different application scenarios, the endoscope light source device can be selected from the first module 21 and the second module 22 to meet different needs. The method of switching the first module 21 and the second module 22 can be, for example, automatic switching through a device such as a motor, or manual switching by an operator. In one embodiment, the first module 21 and the second module 22 are configured to translate in a direction perpendicular to the optical path, such as by driving a motor, a gear and a rack, or by manual push and pull. In another embodiment, the first module 21 and the second module 22 are configured to rotate around a direction parallel to the optical path, such as rotating under the drive of a motor, or manually rotating. Those skilled in the art can configure it according to the prior art, and this embodiment is not limited to this.

It is understandable that in some other embodiments, the beam shaping unit 2 is not limited to only including The first module 21 and the second module 22 may also include a third module, which is also used to be switched to the optical path. Its utility in adapting the energy distribution and angle distribution of the light beam is between the first module 21 and the second module 22, and is used to adapt to the medium space scene. That is, the above application scene is not limited to including large space scenes and small space scenes, and it may also include a medium space scene between the above large space scenes and small space scenes, which is adapted and used through the third module. Further, the above application scenes can be subdivided into more numbers. Similarly, the beam shaping unit 2 can include more modules to adapt to more application scenes, and the present invention is not limited to this.

Please continue to refer to FIG. 1 . Optionally, the light source unit 1 includes a focusing member 13 and a speckle elimination component 14; the speckle elimination component 14 includes a movable scatterer 141; the focusing member 13 is used to converge the light from the light source component 11 on the scatterer 141; and the beam shaping unit 2 is used to receive the light emitted by the scatterer 141. In an exemplary embodiment, the scatterer 141 moves under the drive of the driving member 142. The driving member 142 may be a rotating wheel, which is used to drive the scatterer 141 to rotate. Alternatively, the driving member 142 may also be a reciprocating motor, which can drive the scatterer 141 to reciprocate and translate, etc. Those skilled in the art may configure the driving member 142 according to the prior art, and this embodiment is not limited thereto.

The image illuminated by the laser light source (or SLD light source) will have speckle. In order to reduce or eliminate the speckle, the present embodiment is provided with the above-mentioned speckle elimination component 14. The principle is that the laser is scattered on the scatterer 141 to form a scattering pattern. The scattering patterns of the laser at different positions of the scatterer 141 are different. During the exposure time of each frame of the endoscope camera, the laser is emitted at different positions of the continuously moving scatterer 141. In this way, the more different scattering patterns are superimposed, the smaller the contrast of the speckle is, and the weaker the effect of the speckle on the illumination is. The setting of the focusing element 13 focuses the coherent light spot on the scatterer 141. Since the light spot hitting the scatterer 141 is the focused light spot, the light spot is small, and more speckle patterns are formed every certain movement path (for example, one turn, or one reciprocating translation), so that a lower speckle contrast can be achieved, and the effect of the speckle on the illumination is minimized.

Optionally, please continue to refer to Figure 1, the endoscope light source device also includes a rear adjustment unit 3, which is used to adjust and output the light beam distributed by the beam shaping unit 2. Here, the adjustment of the light beam by the rear adjustment unit 3 may include, for example, collimation, adjustment of color temperature or color rendering, and light homogenization. Preferably, the rear adjustment unit 3 includes a light homogenization component 31; the light homogenization component 31 includes at least one light homogenization member 311, and when the light homogenization component 31 includes more than two light homogenization members 311, all light homogenization members 311 are arranged axially and/or radially along the optical path.

Please refer to Figures 9 and 10, where Figure 9 shows a schematic diagram of laser illumination without uniform light, and Figure 10 shows a schematic diagram of laser illumination with uniform light. The illumination field is A1, and the shooting field of the camera 41 is A2. In the application scenario of close-range illumination (referring to the relatively small distance between the endoscope and the observed target object, such as a few millimeters), due to the small laser spot and relatively concentrated energy, when close-range illumination occurs, a part of the area near the middle position of the camera 41 has no illumination light or the illumination light is weak, such as the shaded area A3 in Figure 9, that is, no effective illumination is provided. And this area without effective illumination is relatively large.

By setting the light homogenizing component 31, as shown in FIG10 , the emitted light beam is homogenized, which significantly reduces the range of the unlit area, such as the shadow area A4 in FIG10 . Compared with FIG9 , the distance without effective lighting can be reduced, and the lighting effect of the lighting field at a close distance can be effectively improved.

In an exemplary embodiment, the light homogenizing member 311 may be a light homogenizing rod, and the light homogenizing assembly 31 may be formed by splicing at least two light homogenizing rods, and the splicing may be radial splicing (as shown in FIG. 11 ) or axial splicing (as shown in FIG. 12 ). In one embodiment, a plurality of light homogenizing rods may be radially spliced to form a thicker rod, and then the two rods may be axially spliced. The splicing surfaces of adjacent light homogenizing rods may be glued or fused together, or there may be air gaps. This embodiment is not limited to this.

Optionally, the rear adjustment unit 3 includes a light guide component 32, and the light guide component 32 is connected to the light homogenizing component 31 in axial contact along the optical path. The light guide component 32 may include an optical fiber. In the exemplary embodiment shown in FIG1 , the light guide component 32 includes two optical fibers, and the light incident end of the light guide component 32 is face-to-face connected to the light emission end of the light homogenizing component 31. The light beam homogenized by the light homogenizing component 31 is directly coupled into the light guide component 32, and then emitted from the light emission end of the light guide component 32 to illuminate the target tissue. It can be understood that the setting of the light homogenizing component 31 can homogenize the light beam into a uniform light spot, and is also conducive to preventing the laser from damaging the light guide component 32 due to long-term irradiation.

Optionally, the rear adjustment unit 3 includes a white light source assembly 33 and a second light combining component 34, the white light source assembly 33 is used to emit white light, and the second light combining component 34 is used to combine the light beam emitted by the light source unit 1 and the white light emitted by the white light source assembly 33. The second light combining component 34 may be a dichroic mirror. The arrangement of the white light source assembly 33 and the second light combining component 34 can improve the color rendering index of the lighting. It can be understood that the white light source assembly 33 may also include the beam shaping unit 2 as described above, so that the white light emitted by it can be adjusted to a distribution suitable for different application scenarios.

Optionally, the entire optical path also includes a plurality of collimating components 4, which are used to collimate the light beam. If the component 4 includes a lens or a lens group, those skilled in the art can understand it based on the prior art, and it will not be elaborated in this embodiment.

Based on the endoscope light source device as described above, an embodiment of the present invention further provides an endoscope, which includes the endoscope light source device as described above. The endoscope light source device as described above is configured as a light source for the endoscope. The structures and principles of other components of the endoscope are referred to the prior art, and the present invention will not elaborate on them.

In summary, in the endoscope light source device and endoscope provided by the present invention, the endoscope light source device includes a light source unit and a beam shaping unit; the light source unit is used to emit a light beam of a predetermined wavelength; the beam shaping unit includes at least a first module and a second module, and the beam shaping unit is configured to switch the first module or the second module to the optical path to distribute the energy distribution and the angle distribution of the light beam, so that the energy distribution and the angle distribution of the distributed light beam are adapted to different application scenarios; wherein, compared with the second module, the first module makes the energy distribution of the distributed light beam more inclined to a flat-top distribution, and makes the angle distribution of the distributed light beam more inclined to uniform; compared with the second module, In the first module, the energy distribution of the allocated light beam is more inclined to Gaussian distribution, and the angular distribution of the allocated light beam is more inclined to concentration; the first module includes a first surface facing the light source unit and a second surface away from the light source unit; the first surface is used to refract the edge light beam in the light beam inwardly and refract the near-center light beam in the light beam outwardly; the second surface is used to refract both the edge light beam and the near-center light beam inwardly; and/or, the second module includes a third surface facing the light source unit and a fourth surface away from the light source unit, and the third surface and the fourth surface are both used to refract the edge light beam inwardly and refract the near-center light beam inwardly. In this configuration, based on the setting of the beam shaping unit, the first module or the second module is switched to the optical path to allocate the energy distribution and angular distribution of the light beam emitted from the light source unit, so that the energy distribution and angular distribution of the allocated light beam are adapted to different application scenarios, effectively overcoming the problem that the existing endoscope light source has a single applicable scenario (mainly applicable to smaller spaces).

It should be noted that the above embodiments can be combined with each other. The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure are within the scope of protection of the claims.

Claims (15)

1. An endoscope light source device, characterized in that it comprises: a light source unit and a beam shaping unit;

   The light source unit is used to emit a light beam of a predetermined wavelength;

   The beam shaping unit includes at least a first module and a second module, and the beam shaping unit is configured to switch and select the first module or the second module to the optical path to distribute the energy distribution and the angle distribution of the light beam, so that the energy distribution and the angle distribution of the light beam after distribution are adapted to different application scenarios;

   Compared with the second module, the first module makes the energy distribution of the allocated light beam more inclined to flat-top distribution, and makes the angle distribution of the allocated light beam more inclined to uniform; compared with the first module, the second module makes the energy distribution of the allocated light beam more inclined to Gaussian distribution, and makes the angle distribution of the allocated light beam more inclined to concentrated;

   The first module comprises a first surface facing the light source unit and a second surface away from the light source unit; the first surface is used to refract the edge beam in the light beam inwardly and refract the near-center beam in the light beam outwardly; the second surface is used to refract both the edge beam and the near-center beam inwardly; and/or,

   The second module includes a third surface facing the light source unit and a fourth surface away from the light source unit, and the third surface and the fourth surface are both used to refract the edge beam of the light beam inwardly and refract the near-center beam of the light beam inwardly.
2. The endoscope light source device according to claim 1 is characterized in that the second surface is also used to make the angle of inward refraction of the edge light beam greater than the angle of inward refraction of the near-center light beam.
3. The endoscope light source device according to claim 1, characterized in that

   The first surface is a Gaussian surface that is concave toward the second surface; the second surface is a composite surface whose edge curvature is greater than the center curvature and is convex toward the side away from the light source unit; and/or,

   The third surface is a surface that is concave toward the fourth surface; and the fourth surface is a surface that is convex toward a side away from the light source unit.
4. The endoscope light source device according to claim 1 is characterized in that the first module and the second module are configured to move in a direction at an angle to the optical path to alternatively enter the optical path or exit the optical path.
5. The endoscope light source device according to claim 1 is characterized in that the light source unit includes a first light combining component and at least two light source assemblies, each of the light source assemblies emits light of a different predetermined wavelength, and the first light combining component is used to combine the light emitted by all the light source assemblies to form the light beam.
6. The endoscope light source device according to claim 5 is characterized in that the central wavelength of the light emitted by one of the light source components is 405 nm, and the central wavelength of the light emitted by the other light source component is 638 nm.
7. The endoscope light source device according to claim 1, characterized in that the light source unit comprises a light source assembly, a focusing member and a speckle elimination assembly; the light source assembly is used to emit light of a predetermined wavelength;

   The speckle reduction assembly includes a movable scatterer;

   The focusing member is used to focus the light from the light source assembly onto the scatterer;

   The beam shaping unit is used to receive the light beam emitted by the scatterer.
8. The endoscope light source device according to claim 1 is characterized in that it also includes a post-adjustment unit, which is used to adjust and output the light beam distributed by the beam shaping unit.
9. The endoscope light source device according to claim 8 is characterized in that the rear adjustment unit includes a light homogenizing component; the light homogenizing component includes at least one light homogenizing member, and when the light homogenizing component includes more than two light homogenizing members, all the light homogenizing members are arranged axially and/or radially along the optical path.
10. The endoscope light source device according to claim 9 is characterized in that the rear adjustment unit includes a light guide assembly, and the light guide assembly is in contact and connected with the light homogenizing assembly along the axial direction of the optical path.
11. The endoscope light source device according to claim 8 is characterized in that the rear adjustment unit includes a white light source assembly and a second light combining component, the white light source assembly is used to emit white light, and the second light combining component is used to combine the light beam emitted by the light source unit and the white light emitted by the white light source assembly.
12. The endoscope light source device according to claim 1 is characterized in that the first module includes a lens, the lens is arranged perpendicular to the light path, the side of the lens facing the light source unit is the first side, and the side of the lens away from the light source unit is the second side.
13. The endoscope light source device according to claim 1 is characterized in that the first module includes more than two lenses, forming a lens group for multi-stage refraction of the light beam, and the lens group The side of the lens group facing the light source unit is the first side, and the side of the lens group farthest from the light source unit is the second side.
14. The endoscope light source device according to claim 1 is characterized in that the beam shaping unit also includes a third module, and the third module is used to be switched and selected into the optical path to distribute the energy distribution and angle distribution of the light beam, so that the energy distribution and angle distribution of the distributed light beam are adapted to an application scenario between the application scenario adapted by the first module and the application scenario adapted by the second module.
15. An endoscope, comprising the endoscope light source device according to any one of claims 1 to 14.