Disclosure of Invention
The embodiment of the application provides an endoscope light source system and an endoscope. The technical scheme is as follows:
According to a first aspect of the present application, there is provided an endoscope light source system including:
the device comprises a first light source assembly, an X-type light combining lens group, a second light source assembly, a light combining lens and a light source light outlet;
The first light source component is used for emitting n first light beams, and the second light source component is used for emitting a second light beam;
The X-type light combining lens group is positioned on the light emitting side of the first light source component, the X-type light combining lens group comprises a first light emitting opening and n first light entering openings, n is 2 or 3, the X-type light combining lens group is used for respectively receiving the n first light beams through the n first light entering openings and combining the received n first light beams into white light beams, and the X-type light combining lens group emits the white light beams from the first light emitting openings;
the light converging lens is positioned outside the first light outlet and positioned in the light outlet direction of the second light source assembly, and is used for receiving the white light beam and the second light beam, converging the white light beam and the second light beam and guiding the white light beam and the second light beam to the light outlet of the light source.
Optionally, the endoscope light source system further comprises a flat lens, the first light beam is a visible light beam, and the second light beam is a near infrared light beam;
The light combining lens comprises a dichroic mirror, the dichroic mirror comprises a second light inlet, a third light inlet and a second light outlet, the second light inlet and the third light inlet are respectively positioned at two sides of the dichroic mirror, and the second light outlet is positioned at one side of the dichroic mirror facing the second light inlet;
the dichroic mirror is used for reflecting the white light beam and transmitting the near infrared beam, the X-shaped light combining lens group is positioned outside the second light inlet, the flat lens and the second light source component are positioned outside the third light inlet, and the flat lens and the second light source component are sequentially distributed along the direction far away from the third light inlet;
the included angle between the mirror surface of the dichroic mirror and the mirror surface of the flat lens is more than 0 degrees and less than 180 degrees, and the flat lens is a light-transmitting lens.
Optionally, the thickness of the dichroic mirror is the same as the thickness of the flat lens.
Optionally, the mirror surface of the dichroic mirror is perpendicular to the mirror surface of the flat lens.
Optionally, the first light beam is a visible light beam, and the second light beam is a near infrared light beam;
The light combining lens comprises a dichroic mirror, the dichroic mirror comprises a second light inlet, a third light inlet and a second light outlet, the second light inlet and the third light inlet are respectively positioned at two sides of the dichroic mirror, and the second light outlet is positioned at one side of the dichroic mirror facing the third light inlet;
The dichroic mirror is used for transmitting the white light beam and reflecting the second light beam, the X-shaped light combining lens group is positioned outside the second light inlet, and the second light source component is positioned outside the third light inlet.
Optionally, the endoscope light source system further comprises a collimating lens group, wherein the collimating lens group is positioned between the first light source component and the light combining lens;
the collimating lens group comprises a first lens and a second lens which are arranged along the light path and are positioned between the first light source component and the X-shaped collimating lens group;
the first lens has positive optical power, and the second lens has negative optical power;
The first lens and the second lens satisfy the following formula:
0.03≤1/f1+(h2/h1)×(1/f2)≤0.3；
Wherein f1 is a focal length of the first lens, h1 is a clear aperture of the first lens, f2 is a focal length of the second lens, and h2 is a clear aperture of the second lens.
Optionally, the collimating lens group further includes a third lens, a fourth lens and a fifth lens arranged along the optical path, the third lens is located between the second lens and the X-type light combining lens group, and the fourth lens and the fifth lens are located between the light combining lenses;
The third lens has positive focal power, the fourth lens has negative focal power, and the fifth lens has positive focal power;
The third lens, the fourth lens, and the fifth lens satisfy the following formulas:
0≤1/f3+(h4/h3)×(1/f4)+(h5/h3)×(1/f5)≤0.01；
Wherein f3 is a focal length of the third lens, h3 is a clear aperture of the third lens, f4 is a focal length of the fourth lens, h4 is a clear aperture of the fourth lens, f5 is a focal length of the fifth lens, and h5 is a clear aperture of the fifth lens.
Optionally, the endoscope light source system further comprises a converging lens group, and the converging lens group is positioned between the light combining lens and the light source light outlet;
The converging lens group comprises a sixth lens and a seventh lens which are arranged along the light path;
The sixth lens has positive optical power, and the seventh lens has positive optical power;
the sixth lens and the seventh lens satisfy the following formula:
0.005≤1/f6+(h7/h6)×(1/f7)≤0.02；
Wherein f6 is a focal length of the sixth lens, h6 is a clear aperture of the sixth lens, f7 is a focal length of the seventh lens, and h7 is a clear aperture of the seventh lens.
Optionally, the endoscope light source system further comprises a light homogenizing rod, wherein the light homogenizing rod is positioned at the light outlet of the light source;
The light homogenizing rod comprises a core body and a coating layer, wherein the coating layer is coated on the outer side of the core body, and the refractive index of the core body is larger than that of the coating layer.
According to another aspect of the present application, there is provided an endoscope characterized in that the endoscope includes the above-described endoscope light source system.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
An endoscope light source system is provided that includes a first light source assembly, an X-ray combiner set, a second light source assembly, a combiner lens, and a light source light outlet. The n first light beams emitted by the first light source component are synthesized into white light beams through the X-type light combining lens, and the white light beams and the second light beams emitted by the second light source component are converged and guided to the light source light outlet through the light combining lens. Therefore, the structure of the endoscope light source system is simple and the structure is compact by arranging the X-shaped light combining lens group and the two light combining lens groups. The problem of complex structure of the endoscope light source system in the related art can be solved, and the effect of simplifying the structure of the endoscope light source system is achieved.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
An endoscope is a detection instrument including a light source system and an imaging system, and is one of important surgical instruments in minimally invasive surgery. The light source system may be a cold light source system, that is, the light source system has a small difference between the temperature of the light source system and the ambient temperature when the light source system emits light. In an endoscope, an optical fiber can be used as a transmission medium of a light source, a light source system of the endoscope can generate a light source beam, the light source beam can be transmitted into the optical fiber, the optical fiber is used as a transmission medium of the light source beam, the light source beam is transmitted to a target illumination object, and the light source system can provide an illumination light source for lumen observation and inspection.
When the endoscope is used for diagnosing diseases, the acquired visible light image is subjected to image registration with other wave band images (such as near infrared light images) except for visible light, so that the diagnosis efficiency and accuracy can be improved. Therefore, the endoscope light source system is provided with a plurality of first light source components, a plurality of first light combining lenses, a second light source component and a second light combining lens, so that after white light is combined by the first light source components and the plurality of first light combining lenses, the combined white light and the second light source components are combined and then output to the endoscope light source system.
In the above-mentioned endoscope light source system, the structure of the optical assembly for combining light is complicated, resulting in a large volume of the endoscope light source system.
Embodiments of the present application provide an endoscope light source system and an endoscope capable of solving the problems existing in the related art described above.
Fig. 1 is a schematic structural diagram of an endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 1. The endoscope light source system 10 may include: the first light source component 11, the X-shaped light combining lens group 12, the second light source component 13, the light combining lens 14 and the light source light outlet 15.
The first light source assembly 11 may be used to emit n first light beams s1, and the second light source assembly 13 is used to emit a second light beam s3. The first beam s1 and the second beam s3 are different beams, and the n beams of the first beam s1 may be different color beams respectively.
The X-type light combining lens set 12 may be located on the light emitting side of the first light source assembly 11, and the X-type light combining lens set 12 may include a first light emitting opening 12b and n first light incident openings 12a, where n is 2 or 3. That is, the number of the first light beams s1 emitted from the first light source assembly 11 and the number of the first light inlet 12a may be the same.
The X-type light combining lens set 12 is configured to receive n first light beams s1 through n first light inlets 12a, and combine the received n first light beams s1 into a white light beam s2, and the X-type light combining lens set 12 may also emit the white light beam s2 from the first light outlets 12 b.
The light combining lens 14 may be located outside the first light outlet 12b and located in the light outlet direction of the second light source assembly 13, where the light combining lens 14 is configured to receive the white light beam s2 and the second light beam s3, and combine the white light beam s2 and the second light beam s3 to guide to the light source light outlet 15. In this way, the n first light beams s1 emitted from the first light source assembly 11 and the second light beams s3 emitted from the second light source assembly 13 may be combined into one light beam by the X-type light combining lens group 12 and the light combining lens 14, and emitted from the endoscope light source system 10 through the light source light emitting port 15.
In summary, the embodiment of the application provides an endoscope light source system including a first light source assembly, an X-type light combining lens set, a second light source assembly, a light combining lens and a light source light outlet. The n first light beams emitted by the first light source component are synthesized into white light beams through the X-type light combining lens, and the white light beams and the second light beams emitted by the second light source component are converged and guided to the light source light outlet through the light combining lens. Therefore, the structure of the endoscope light source system is simple and the structure is compact by arranging the X-shaped light combining lens group and the two light combining lens groups. The problem of complex structure of the endoscope light source system in the related art can be solved, and the effect of simplifying the structure of the endoscope light source system is achieved.
It should be noted that, in the embodiment of the present application, the first light source includes the first light emitter 111, the second light emitter 112, and the third light emitter 113, and in other alternative implementations, the first light source may further include the first light emitter 111, or the first light source includes the first light emitter 111 and the second light emitter 112.
The first light outlet 12b, the first light inlet 12a, the second light outlet 14c, the second light inlet 14a and the light source light outlet 15 in the embodiment of the present application may be virtual areas in the endoscope light source system 10, and as an example, the first light inlet 12a may be a light inlet area through which the first light beam s1 emitted by the first light source assembly 11 enters the X-type light combining lens set 12, and the first light outlet 12b may be a light outlet area through which the white light beam s2 exits the X-type light combining lens set 12; the light source light outlet 15 may be a light outlet region through which the white light beam s2 and the second light beam s3 exit the endoscope light source system 10.
Or the first light outlet 12b, the first light inlet 12a, the second light outlet 14c, the second light inlet 14a and the light source light outlet 15 may also be actual structures, and the exemplary X-type light combining lens set 12 may be an X-type light combining prism, the X-type light combining prism may include three first light inlet surfaces and one first light outlet surface, the first light inlet surface of the X-type light combining prism may be the first light inlet 12a, and the first light outlet surface may be the first light outlet 12b. The endoscope light source system 10 may also include a light homogenizing assembly, which may be located at the light source light outlet 15 of the endoscope light source system 10. The X-shaped light combining prism is square in shape and convenient to assemble.
Fig. 2 is a schematic diagram of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 2. Optionally, the first light beam s1 is a visible light beam, and the second light beam s3 is a near infrared light beam. The wavelength range of the first light beam s1 may be 400 nanometers (nm) to 700 nanometers (nm), and the wavelength range of the second light beam s3 may be 810 nanometers (nm) to 890 nanometers (nm).
The endoscope light source system 10 may further include a flat lens 16, the flat lens 16 may be a light transmissive lens, and the flat lens 16 may be located between the second light source module 13 and the light combining lens 14.
The light combining lens 14 may include a dichroic mirror, and the dichroic mirror may include a second light inlet 14a, a third light inlet 14b, and a second light outlet 14c, where the second light inlet 14a and the third light inlet 14b are respectively located at two sides of the dichroic mirror, and the second light outlet 14c is located at one side of the dichroic mirror facing the second light inlet 14 a. That is, the second light outlet 14c and the second light inlet 14a may be located at the same side of the dichroic mirror, and the third light inlet 14b may be located at the other side of the dichroic mirror.
The dichroic mirror may be used to reflect the white light beam s2 and transmit the near infrared light beam, the X-type light combining lens set 12 is located outside the second light inlet 14a, and the flat lens 16 and the second light source assembly 13 are located outside the third light inlet 14b and are sequentially arranged in a direction away from the third light inlet 14 b.
The light combining lens 14 is configured to receive the white light beam s2 provided by the X-type light combining lens set 12 and the second light beam s3 emitted from the second light source assembly 13 through the second light inlet 14a and the third light inlet 14b, and guide the received white light beam s2 and the received second light beam s3 to the light source light outlet 15 through the second light outlet 14 c.
The second light inlet 14a may be a light inlet area through which the white light beam s2 provided by the X-type light combining lens set 12 enters the light combining lens 14, the third light inlet 14b may be a light inlet area through which the second light beam s3 emitted by the second light source assembly 13 enters the light combining lens 14, and the second light outlet 14c may be a light outlet area through which the white light beam s2 and the second light beam s3 exit the light combining lens 14.
The angle between the mirror surface of the dichroic mirror and the mirror surface of the flat lens 16 is greater than 0 degrees and less than 180 degrees. Fig. 3 is a light path diagram of a second light beam s3 provided in the embodiment of the present application, please refer to fig. 3, the second light beam s3 emitted from the second light source assembly 13 may first pass through the flat lens 16 and then pass through the dichroic mirror, and as the second light beam s3 enters the dichroic mirror from the air and then is refracted when entering the air from the dichroic mirror, a transmission path of the second light beam s3 is deviated; accordingly, it is possible to make the second light beam s3 incident on the flat lens 16 from the air and then refracted when incident on the flat lens 16 from the air by providing the light-transmitting flat lens 16 in the transmission path of the second light beam s3, and the mirror surface of the dichroic mirror and the mirror surface of the flat lens 16 are not parallel. In this way, the second light beam s3 emitted from the second light source component 13 can be offset in two different directions in the transmission process, that is, the flat lens 16 can be used for balancing the offset generated when the second light beam s3 passes through the dichroic mirror, so as to compensate the angle asymmetry generated when the second light beam s3 only passes through the dichroic mirror, and the light emitting angle of the second light beam s3 is symmetrical along the optical axis of the second light beam s 3.
Alternatively, the thickness of the dichroic mirror and the thickness of the flat lens 16 may be the same, so that the offset of the second light beam s3 emitted from the second light source assembly 13, which is generated through the flat lens 16, is the same as the offset of the second light beam s3 emitted from the second light source assembly 13, which is generated through the dichroic mirror.
Optionally, the mirror surface of the dichroic mirror and the mirror surface of the flat lens 16 may be perpendicular, so that the adjustment degree of the flat lens 16 to the second light beam s3 may be further improved, the symmetry of the light exit angle of the second light beam s3 along the optical axis of the second light beam s3 may be further improved, and the transmission path of the second light beam s3 is prevented from being deflected.
Fig. 4 is a schematic structural diagram of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 4. Optionally, the first light beam s1 is a visible light beam, the second light beam s3 is a near infrared light beam, the light combining lens 14 includes a dichroic mirror, the dichroic mirror may include a second light inlet 14a, a third light inlet 14b and a second light outlet 14c, the second light inlet 14a and the third light inlet 14b are respectively located at two sides of the dichroic mirror, and the second light outlet 14c is located at a side of the dichroic mirror facing the third light inlet 14 b. That is, the second light outlet 14c and the third light inlet 14b may be located at the same side of the dichroic mirror, and the second light inlet 14a may be located at the other side of the dichroic mirror.
The dichroic mirror may be used to transmit the white light beam s2 and reflect the second light beam s3, and the X-ray combiner set 12 is located outside the second light inlet 14a, and the second light source assembly 13 is located outside the third light inlet 14 b. The light combining lens 14 is configured to receive the white light beam s2 provided by the X-type light combining lens set 12 and the second light beam s3 emitted from the second light source assembly 13 through the second light inlet 14a and the third light inlet 14b, and guide the received white light beam s2 and the received second light beam s3 to the light source light outlet 15 through the second light outlet 14 c.
The white light beam s2 provided by the X-ray combiner set 12 may enter the dichroic mirror from the second light inlet 14a, and pass through the dichroic mirror, and exit from the second light outlet 14c to the light source light outlet 15. The second light beam s3 emitted from the second light source module 13 may be irradiated to the dichroic mirror from the third light inlet 14b, reflected by the dichroic mirror to the second light outlet 14c, and emitted from the second light outlet 14c to the light source light outlet 15. Thus, the structure of the endoscope light source system 10 can be simpler, and the light path is simpler.
Fig. 5 is a schematic diagram of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 5. Alternatively, the first light source assembly 11 may include three LED emitters, which may be a first LED emitter, a second LED emitter, and a third LED emitter, respectively, wherein the first LED emitter may be a red LED emitter for emitting red visible light, the second LED emitter may be a green LED emitter for emitting green visible light, and the third LED emitter may be a blue LED emitter for emitting blue visible light. In a specific implementation, the positions of the first LED light emitter and the third LED light emitter may be interchanged, which is not limited by the embodiment of the present application. Or the first light source assembly 11 may include only one white light source.
The X-type light combining prism may have a light combining surface inside, which may be used to reflect blue visible light and red visible light, and may also transmit green visible light.
Alternatively, as shown in fig. 5, the endoscope light source system 10 may further include a collimator lens group 17, and the collimator lens group 17 is located between the first light source module 11 and the light combining lens 14.
The collimating lens group 17 may include a first lens 171 and a second lens 172 arranged along the optical path and located between the first light source assembly 11 and the X-ray converging lens group 12. The first lens 171 has positive optical power, and the second lens 172 has negative optical power. In the embodiment of the present application, the number of the first lenses 171 may be 3, and the number of the second lenses 172 may be 3.
The first lens 171 and the second lens 172 satisfy the following formula:
0.03≤1/f1+(h2/h1)×(1/f2)≤0.3。
Where f1 is the focal length of the first lens 171, h1 is the clear aperture of the first lens 171, f2 is the focal length of the second lens 172, and h2 is the clear aperture of the second lens 172. The clear aperture is the maximum aperture of the lens that can transmit light. In this way, the first lens 171 with positive focal power can play a role in converging the first light beam s1, the second lens 172 with negative focal power can play a role in diverging the first light beam s1 transmitted through the first lens 171, and the first lens 171 and the second lens 172 can collimate the first light beam s1 as a whole, so that the first light beam s1 emitted by the first light source assembly 11 can propagate along a straight line, and deviation of the first light beam s1 in the process of being transmitted to the X-type light combining lens set 12 by the first light source assembly 11 is avoided.
As shown in fig. 5, the first lens 171 may be a plano-convex lens, the first lens 171 has a first light incident surface and a first light emergent surface, the first light incident surface may be a plane, the first light emergent surface may be a convex surface, a radius of curvature (R) of the first light emergent surface may range from 5mm to 20 mm, and a focal length (f) of the first lens 171 may range from 5mm to 20 mm.
Fig. 6 is a schematic structural diagram of another collimating lens group 17 according to an embodiment of the present application, referring to fig. 6, the first lens 171 may be a concave-convex lens, the first lens 171 may have a first light incident surface and a first light emergent surface, the first light incident surface may be a concave surface, the first light emergent surface may be a convex surface, the range of the radius of curvature (R) of the first light emergent surface may be 5mm to 20 mm, and the range of the focal length (f) of the first lens 171 may be 5mm to 20 mm.
Fig. 7 is a schematic structural diagram of another collimating lens group 17 according to an embodiment of the present application, referring to fig. 7, the first lens 171 may be a biconvex lens, the first lens 171 has a first light incident surface and a first light emergent surface, a radius of curvature (R) of the first light emergent surface may range from 5mm to 20 mm, and a focal length (f) of the first lens 171 may range from 5mm to 20 mm.
As shown in fig. 5, the second lens 172 may be a meniscus concave lens, the second lens 172 has a second light incident surface and a second light emergent surface, the second light incident surface may be a convex surface, the second light emergent surface may be a concave surface, and the focal length (f) of the second lens 172 ranges from-50 mm to-150 mm.
As shown in fig. 6, the second lens 172 may be a meniscus concave lens, the second lens 172 has a second light incident surface and a second light emergent surface, the second light incident surface may be a concave surface, the second light emergent surface may be a convex surface, and the focal length (f) of the second lens 172 ranges from-50 mm to-150 mm.
The lens in the collimating lens group 17 may be a spherical lens or an aspherical lens, and the radius of curvature of the lens surface of the spherical lens in the collimating lens group 17 refers to the spherical radius of the lens surface, and the radius of curvature of the aspherical lens refers to the radius at the vertex of the lens surface. In order to more clearly show the bending direction of the lens surface, assuming that the direction from the image surface to the object surface is positive, when the direction from the surface of the lens in the lens group to the center of the lens is the same as the direction from the image surface to the object surface, the radius of curvature of the lens is positive; when the direction from the surface of the lens to the center of the lens in the optical system is opposite to the direction from the image plane to the object plane, the radius of curvature of the lens is negative.
In the embodiment of the present application, the first lens 171 and the second lens 172 in the collimating lens group 17 may be spherical lenses. Alternatively, at least one of the first lens 171 and the second lens 172 in the collimator lens group 17 may be an aspherical lens.
It should be noted that, in the embodiment of the present application, the arrangement and combination of the first lens 171 and the second lens 172 are not limited to the embodiment shown in fig. 5, 6 and 7, and the first lens 171 and the second lens 172 may also include other combinations, and the number of lenses in the collimating lens group 17 may also be 1, which is not limited in the embodiment of the present application.
Fig. 8 is a schematic diagram of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 8. Optionally, the collimating lens group 17 may further include a third lens 173, a fourth lens 174, and a fifth lens 175 arranged along the optical path, wherein the third lens 173 is located between the second lens 172 and the X-type light combining lens group 12, and the fourth lens 174 and the fifth lens 175 are located between the light combining lens 14. The third lens 173 has positive optical power, the fourth lens 174 has negative optical power, and the fifth lens 175 has positive optical power.
The third lens 173, the fourth lens 174, and the fifth lens 175 satisfy the following formula:
0≤1/f3+(h4/h3)×(1/f4)+(h5/h3)×(1/f5)≤0.01。
wherein f3 is a focal length of the third lens 173, h3 is a clear aperture of the third lens 173, f4 is a focal length of the fourth lens 174, h4 is a clear aperture of the fourth lens 174, f5 is a focal length of the fifth lens 175, and h5 is a clear aperture of the fifth lens 175. The third lens 173, the fourth lens 174 and the fifth lens 175 may cooperate with the first lens 171 and the second lens 172, the third lens 173 may converge the light beam emitted from the second lens 172 again, the fourth lens 174 and the fifth lens 175 may be configured to receive the light beam provided by the X-type optical combiner set 12, the fourth lens 174 and the fifth lens 175 may share an optical axis, the fifth lens 175 with positive focal power may perform a converging function on the first light beam s1, the fourth lens 174 with negative focal power may perform a diverging function on the first light beam s1, and overall, the fourth lens 174 and the fifth lens 175 may guide the first light beam s1 to the optical combiner set 14, and may transmit the light beam to the optical combiner set 14 after re-collimation, so as to avoid the divergence of the first light beam s1 during transmission.
As shown in fig. 8, the third lens 173 may be a plano-convex lens, the third lens 173 has a third light incident surface and a third light emergent surface, the third light incident surface may be a plane, the third light emergent surface may be a convex surface, and the focal length (f) of the third lens 173 may range from 10 mm to 40 mm.
Or fig. 9 is a schematic structural diagram of another collimating lens group 17 according to an embodiment of the present application, the third lens 173 may be a biconvex lens, the third lens 173 has a third light incident surface and a third light emergent surface, and the focal length (f) of the third lens 173 may range from 10 mm to 40 mm. In the embodiment of the present application, the number of the third lenses 173 may be 3.
As shown in fig. 8, the fourth lens 174 may be a meniscus concave lens, the fourth lens 174 has a fourth light incident surface and a fourth light emergent surface, the fourth light incident surface may be a convex surface, the fourth light emergent surface may be a concave surface, and the focal length (f) of the fourth lens 174 ranges from-50 mm to-200 mm.
Referring to fig. 9, the fourth lens 174 may be a meniscus concave lens, the fourth lens 174 has a fourth light incident surface and a fourth light emergent surface, the fourth light incident surface may be a concave surface, and the fourth light emergent surface may be a convex surface.
As shown in fig. 8, the fifth lens 175 may be a biconvex lens, and the focal length (f) value of the fifth lens 175 may range from 20mm to 80 mm.
As shown in fig. 9, the fifth lens 175 may be a plano-convex lens, the fifth lens 175 has a fifth light incident surface and a fifth light emergent surface, the fifth light incident surface may be a plane, the fifth light emergent surface may be a convex surface, and the focal length (f) of the fifth lens 175 may range from 20 mm to 80 mm.
The third lens 173, the fourth lens 174, and the fifth lens 175 may be spherical lenses or aspherical lenses.
It should be noted that, in the embodiment of the present application, the arrangement and combination of the fourth lens 174 and the fifth lens 175 are not limited to the embodiment shown in fig. 8 and 9, and the fourth lens 174 and the fifth lens 175 may also include other combinations, and the fourth lens 174 and the fifth lens 175 may also be 1 lens, which is not limited in the embodiment of the present application.
The first lens 171, the second lens 172, the third lens 173, the fourth lens 174, and the fifth lens 175 may serve as a collimation adjustment lens group for the first light beam s1 provided by the first light source assembly 11, may collimate a first light collection angle of the first light beam s1 when entering the X-type light combining lens group 12 to a smaller second light collection angle, and the first light collection angle may refer to a divergence angle of the first light beam s1 that the X-type light combining lens group 12 can receive, which may be 2 times an included angle between an edge of the first light beam s1 and an optical axis of the first light beam s1, and may be 140 degrees, for example. When the white light synthesized by the three first light beams s1 passes through the fifth lens 175 and irradiates the light combining lens 14, the second light collecting angle can be the divergence angle of the white light beam s2 received by the light combining lens 14, so that the white light beam s2 can be prevented from being irradiated to the light combining lens 14, that is, the light combining lens 14 can receive more white light beams s2, so that the utilization rate of the first light beam s1 emitted by the first light source assembly 11 is improved, the first light beam s1 can be prevented from being converted into heat, and the heating value of the endoscope light source system 10 can be reduced.
Fig. 10 is a schematic structural diagram of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 10. Optionally, the endoscope light source system 10 further includes a converging lens group 18, where the converging lens group 18 is located between the converging lens 14 and the light source light outlet 15; the converging lens group 18 includes a sixth lens 181 and a seventh lens 182 arranged along the optical path. The sixth lens 181 and the seventh lens 182 share the optical axis.
The sixth lens 181 has positive optical power, and the seventh lens 182 has positive optical power;
The sixth lens 181 and the seventh lens 182 satisfy the following formula:
0.005≤1/f6+(h7/h6)×(1/f7)≤0.02。
Where f6 is the focal length of the sixth lens 181, h6 is the clear aperture of the sixth lens 181, f7 is the focal length of the seventh lens 182, and h7 is the clear aperture of the seventh lens 182.
As shown in fig. 10, the sixth lens 181 may be a biconvex lens, the sixth lens 181 has a sixth light incident surface and a sixth light exit surface, a radius of curvature (R) of the sixth light exit surface may range from 5 mm to 20 mm, and a focal length (f) of the sixth lens 181 may range from 30 mm to 100 mm.
Fig. 11 is a schematic structural diagram of another converging lens assembly 18 according to an embodiment of the present application, referring to fig. 11, a sixth lens element 181 may be a plano-convex lens element, the sixth lens element 181 has a sixth light incident surface and a sixth light exiting surface, the sixth light incident surface may be a plane, the sixth light exiting surface may be a convex surface, a radius of curvature (R) of the sixth light exiting surface may range from 5mm to 20 mm, and a focal length (f) of the sixth lens element 181 may range from 30 mm to 100mm.
As shown in fig. 10, the seventh lens 182 may be a meniscus lens, the seventh lens 182 has a seventh light incident surface and a seventh light emergent surface, the seventh light incident surface may be a convex surface, the seventh light emergent surface may be a concave surface, the radius of curvature (R) of the seventh light incident surface may range from 5mm to 20 mm, and the focal length (f) of the seventh lens 182 may range from 5mm to 30 mm.
Fig. 11 is a schematic structural diagram of another converging lens assembly 18 according to an embodiment of the present application, referring to fig. 6, a seventh lens element 182 may be a biconvex lens, the seventh lens element 182 has a seventh light incident surface and a seventh light exiting surface, a radius of curvature (R) of the seventh light incident surface may range from 5mm to 20 mm, and a focal length (f) of the first lens element 171 may range from 5mm to 30 mm.
Fig. 12 is a schematic structural diagram of another converging lens assembly 18 according to an embodiment of the present application, referring to fig. 12, a seventh lens element 182 may be a plano-convex lens element, the seventh lens element 182 has a seventh light incident surface and a seventh light exiting surface, the seventh light incident surface may be a convex surface, the seventh light exiting surface may be a plane, a radius of curvature (R) of the seventh light incident surface may range from 5mm to 20 mm, and a focal length (f) of the seventh lens element 182 may range from 5mm to 30 mm. When aspherical lenses are used, the number of lenses in the converging lens group 18 may be 1, which is not limited in the embodiment of the present application.
It should be noted that, the lens in the converging lens group 18 may be a spherical lens or an aspherical lens, and the characteristics of the aspherical lens are: unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
The sixth lens 181 and the seventh lens 182 may be spherical lenses, which have low manufacturing difficulty and reduce manufacturing difficulty of the endoscope light source system 10.
Fig. 13 is a schematic structural diagram of another endoscope light source system 10 provided by the embodiment of the present application, referring to fig. 13, in an alternative embodiment, the endoscope light source system 10 may further include an eighth lens 19, the eighth lens 19 may be located outside the light outlet of the second light source assembly 13, the eighth lens 19 may be used for receiving the second light beam s3 emitted from the second light source assembly 13, the eighth lens 19 may converge the light beam emitted from the second light source assembly 13, and the eighth lens 19, the sixth lens 181 and the seventh lens 182 form a collimating lens group corresponding to the second light beam s3, so that the second light beam s3 irradiates the light source light outlet 15 according to a preset optical path and an angle.
Fig. 14 is a schematic structural view of another endoscope light source system 10 according to an embodiment of the present application, fig. 15 is a schematic structural view of another endoscope light source system 10 according to an embodiment of the present application, fig. 16 is a schematic structural view of a section of a light homogenizing rod 151 shown in fig. 15 along A1-A2, and referring to fig. 14, 15 and 16, optionally, the endoscope light source system 10 further includes a light homogenizing rod 151, where the light homogenizing rod 151 is located at the light source light outlet 15. The light rod 151 may receive the mixed light beam of the white light beam s2 and the second light beam s3 and reflect the mixed light beam multiple times inside the light rod 151, thereby making the light rod 151 more uniform.
The light rod 151 may include a core 1511 and a cladding 1512, the cladding 1512 cladding an outside of the core 1511, the core 1511 having a refractive index greater than that of the cladding 1512. In this way, the light beam irradiated to the contact position of the core 1511 and the clad 1512 can be totally reflected, and the light beam utilization can be improved. The light beam emitted from the light homogenizing rod 151 can enter the optical fiber of the endoscope and be transmitted to the target illumination object through the optical fiber.
Also, the numerical aperture angle NA of the integrator rod 151 may satisfy the following formula:
where n1 is the refractive index of the material of the core 1511, n2 is the refractive index of the material of the cladding 1512, and the numerical aperture NA is a dimensionless number that measures the angular range of light that can be collected by an optical element (the integrator rod 151).
In this way, the core 1511 and the cladding 1512 in the light homogenizing rod 151 may be disposed to adjust the numerical aperture angle of the light homogenizing rod 151, so that the numerical aperture angle of the light homogenizing rod 151 and the numerical aperture angle of the optical fiber may be matched, the light energy utilization rate of the endoscope light source system 10 may be improved, or the phenomenon that the brightness of the endoscope light source system 10 cannot meet the requirement of the endoscope imaging system may be avoided.
Alternatively, the shape of the light rod 151 may include a cylinder, a cone, or a polygonal cylinder.
Fig. 17 is a schematic structural view of another endoscope light source system 10 according to an embodiment of the present application, and fig. 18 is a schematic structural view of another endoscope light source system 10 according to an embodiment of the present application, please refer to fig. 17 and 18. The X-dichroic mirror set 12 may be an X-dichroic mirror, which may have the same light combining effect as the X-dichroic prism, and which is more advantageous for heat dissipation of the endoscope light source system 10. The X-type dichroic mirror may include a first mirror and a second mirror, the mirror surface of the first mirror being perpendicular to the mirror surface of the second mirror, the first mirror may be for reflecting blue visible light and transmitting other light, the second mirror may be for reflecting red visible light and transmitting other light, and the first mirror and the second mirror may be for transmitting green visible light, for example.
Fig. 19 is a schematic structural view of a second light source assembly 13, an eighth lens 19 and a flat lens 16 according to an embodiment of the present application, and fig. 20 is a schematic structural view of another second light source assembly 13, an eighth lens 19 and a flat lens 16 according to an embodiment of the present application, please refer to fig. 19 and fig. 20, alternatively, the eighth lens 19 in the embodiment of the present application may move back and forth between the second light source assembly 13 and the flat lens 16, and since the light emitting angles of the second light source assembly 13 made of different light emitting materials are not consistent, when the second light source assembly 13 is replaced, the position of the eighth lens 19 may be adjusted accordingly to change the focal length of the second light beam s 3. As shown in fig. 19, the second light source assembly 13 includes a first laser 131 or a second laser 132, and the first laser 131 or the second laser 132 may be selected during use of the endoscope light source system 10. The eighth lens 19 is located at the first position C1 when the endoscope light source system 10 uses the first laser 131, and the eighth lens 19 is located at the second position C2 when the endoscope light source system 10 uses the second laser 132. The light emitting angle of the first laser 131 is smaller than that of the second laser 132, and the first position C2 is closer to the second light source assembly 13 than the second position C2. The light exit angle may refer to the divergence angle of the beam exiting the laser. In this way, by setting the positions of the eighth lenses 19 differently for the light emission angles of the different lasers, the divergence angles at which the different lasers are irradiated to the flat lens 16 or the light combining lens 14 are the same.
In summary, the embodiment of the application provides an endoscope light source system including a first light source assembly, an X-type light combining lens set, a second light source assembly, a light combining lens and a light source light outlet. The n first light beams emitted by the first light source component are synthesized into white light beams through the X-type light combining lens, and the white light beams and the second light beams emitted by the second light source component are converged and guided to the light source light outlet through the light combining lens. Therefore, the structure of the endoscope light source system is simple and the structure is compact by arranging the X-shaped light combining lens group and the two light combining lens groups. The problem of complex structure of the endoscope light source system in the related art can be solved, and the effect of simplifying the structure of the endoscope light source system is achieved.
In addition, the embodiment of the application also provides an endoscope, which comprises the endoscope light source system in any embodiment.
In the present application, the terms "first", "second", "third", "fourth", "fifth", sixth ", seventh" and "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but rather, the application is to be construed as limited to the appended claims.