Gastroenteroscope lighting system and gastroenteroscope

Abstract

The present application relates to endoscope technology, and discloses a lighting system for a gastroenteroscope and a gastroenteroscope, comprising: a first collimating lens, a second collimating lens, a dichroic mirror, a first focusing lens, and a second focusing lens arranged in sequence from an ultraviolet light source to a light guide rod; in a direction perpendicular to the direction from the ultraviolet light source to the light guide rod, between the three-color light source and the reflecting surface of the dichroic mirror, a third collimating lens, a fourth collimating lens, and a notch plate are arranged in sequence; in a direction parallel to the direction from the ultraviolet light source to the light guide rod, between the amber light source and the reflecting surface of the notch plate, a fifth collimating lens, a sixth collimating lens, and a filter are arranged in sequence; wherein the first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the fifth collimating lens, the sixth collimating lens, the first focusing lens, and the second focusing lens are all spherical lenses. The present application aims to reduce the preparation cost of the lighting system of a gastroenteroscope with multiple light sources.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular to a lighting system for a gastroenteroscope and a gastroenteroscope. Background Art

[0002] Endoscopes can be divided into hard tube type and soft tube type. Hard tube endoscopes are usually used for bronchoscopy, urethroscopy, etc., while soft tube endoscopes are represented by gastroenteroscopes (including esophagoscopes, gastroscopes, colonoscopes, etc.). Among them, in gastroenteroscopes, its lighting system can provide enough light so that doctors can clearly observe the details of the inner wall of the gastrointestinal tract. Good lighting can make the field of view brighter, thereby improving the visibility and accuracy of the examination.

[0003] At present, the optical modules of the lighting systems of medical gastroenteroscopes on the market are mostly designed with aspherical glass lenses, and the processing technology of aspherical lenses is complex, mainly using molding technology, and the cost is relatively high. Especially for gastroenteroscopes with multi-color lighting (gastroenteroscopes with multi-color lighting can improve the quality of images and the accuracy of diagnosis by providing multiple spectra of lighting, allowing doctors to observe the health of the gastrointestinal tract more comprehensively and accurately), more mirror sets are required, which undoubtedly further increases the corresponding preparation costs.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a lighting system for a gastroenteroscope and a gastroenteroscope, aiming to reduce the preparation cost of the lighting system for a gastroenteroscope with multiple light sources.

[0006] To achieve the above-mentioned purpose, the present application provides a lighting system for a gastroenteroscopy, the lighting system comprising: a first collimating lens, a second collimating lens, a dichroic mirror, a first focusing lens, and a second focusing lens arranged in sequence from an ultraviolet light source to a light guide rod, and a transmission surface of the dichroic mirror is at an angle of 45° toward the second collimating lens, and a reflection surface of the dichroic mirror is at an angle of 45° toward the first focusing lens;

[0007] In a direction perpendicular to the direction from the ultraviolet light source to the light guide rod, a third collimating lens, a fourth collimating lens and a notch plate are sequentially arranged between the three-color light source and the reflecting surface of the dichroic mirror; wherein the notch plate is parallel to the dichroic mirror, and the reflecting surface of the notch plate faces the dichroic mirror, and the transmitting surface of the notch plate faces the fourth collimating lens;

[0008] In a direction parallel to the direction from the ultraviolet light source to the light guide rod, between the amber light source and the reflecting surface of the wave trap plate, a fifth collimating lens, a sixth collimating lens and a filter are sequentially arranged;

[0009] Among them, the first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the fifth collimating lens, the sixth collimating lens, the first focusing lens and the second focusing lens are all spherical lenses.

[0010] Optionally, the first collimating lens is a meniscus lens, with a concave surface facing the ultraviolet light source and a convex surface facing the second collimating lens.

[0011] Optionally, the second collimating lens is a plano-convex lens, with the flat surface facing the first collimating lens and the convex surface facing the transmission surface of the dichroic mirror.

[0012] Optionally, the third collimating lens is a meniscus lens, with a concave surface facing the three-color light source and a convex surface facing the fourth collimating lens.

[0013] Optionally, the fourth collimating lens is a plano-convex lens, with a flat surface facing the third collimating lens and a convex surface facing the transmission surface of the wave trap plate.

[0014] Optionally, the fifth collimating lens is a meniscus lens, with the concave surface facing the amber light source and the convex surface facing the sixth collimating lens.

[0015] Optionally, the sixth collimating lens is a plano-convex lens, with the flat surface facing the fifth collimating lens and the convex surface facing the filter.

[0016] Optionally, the first focusing lens is a plano-convex lens, with the flat surface facing the second focusing lens and the convex surface facing the reflecting surface of the dichroic mirror.

[0017] Optionally, the second focusing lens is a meniscus lens, with a concave surface facing the light guide rod and a convex surface facing the first focusing lens.

[0018] To achieve the above objectives, the present application also provides a gastroenteroscope, including the lighting system of the gastroenteroscope as described above.

[0019] The present application provides a gastroenteroscope lighting system and a gastroenteroscope, which integrate ultraviolet light, three-color light and amber light into one lighting system through clever spatial layout, can provide richer visual information, improve the imaging quality of gastroenteroscope images, and enable the three light paths to share the same focusing lens group, thereby reducing the number of lenses required to form the lighting system. The lenses in the lighting system all use spherical lenses with relatively simple processing technology, which greatly reduces the preparation cost of the lighting system. At the same time, by reasonably arranging the lens positions and angles and optimizing the distribution of the light field, the lighting system can provide a uniform light field. Even if spherical lenses are used, the lighting system can still achieve high optical transmission efficiency through precise optical design and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of the structure of the lighting system of a gastroenteroscope in one embodiment of the present application.

[0021] Description of reference numerals:

[0022] 1. Ultraviolet light source; 2. First collimating lens; 3. Second collimating lens; 4. Amber light source; 5. Fifth collimating lens; 6. Sixth collimating lens; 7. Filter; 8. Three-color light source; 9. Third collimating lens; 10. Fourth collimating lens; 11. Notch plate; 12. Dichroic mirror; 13. First focusing lens; 14. Second focusing lens; 15. Light guide rod.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] In addition, if the descriptions of "first", "second", etc. are involved in this application, they are only used for descriptive purposes (such as for distinguishing the same or similar features), and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0026] In one embodiment, a lighting system for a gastroenteroscopy is provided, referring to Figure 1 The lighting system comprises: a first collimating lens 2, a second collimating lens 3, a dichroic mirror 12, a first focusing lens 13 and a second focusing lens 14 arranged in sequence from the ultraviolet light source 1 to the light guide rod 15, and the transmission surface of the dichroic mirror 12 is at an angle of 45° toward the second collimating lens 3, and the reflection surface of the dichroic mirror 12 is at an angle of 45° toward the first focusing lens 13;

[0027] In a direction which is 45° with the reflection surface of the dichroic mirror 12 and is perpendicular to the direction from the ultraviolet light source 1 to the light guide rod 15, a third collimating lens 9, a fourth collimating lens 10 and a notch plate 11 are sequentially arranged between the three-color light source 8 and the reflection surface of the dichroic mirror 12; wherein the notch plate 11 is parallel to the dichroic mirror 12, and the reflection surface of the notch plate 11 faces the dichroic mirror 12, and the transmission surface of the notch plate 11 faces the fourth collimating lens 10;

[0028] In the direction parallel to the direction from the ultraviolet light source 1 to the light guide rod 15, between the amber light source 4 and the reflecting surface of the wave trap 11, a fifth collimating lens 5, a sixth collimating lens 6 and a filter 7 are sequentially arranged;

[0029] Among them, the first collimating lens 2 , the second collimating lens 3 , the third collimating lens 9 , the fourth collimating lens 10 , the fifth collimating lens 5 , the sixth collimating lens 6 , the first focusing lens 13 and the second focusing lens 14 are all spherical lenses.

[0030] In this embodiment, the ultraviolet light source 1 is used to provide ultraviolet light and emit the ultraviolet light to the first collimating lens 2. The ultraviolet light source 1 can be a UV-LED, and the edge light divergence angle is 120°; the central wavelength of the ultraviolet light can be 415 nm.

[0031] The first collimating lens 2 is a lens with positive optical power, and is used to converge the ultraviolet light emitted by the ultraviolet light source 1 to the second collimating lens 3 .

[0032] The second collimating lens 3 is a lens with positive optical power, and is used to further converge the ultraviolet light converged by the first collimating lens 2 to form ultraviolet light parallel to the direction from the ultraviolet light source 1 to the light guide rod 15, and incident on the transmission surface of the dichroic mirror 12 at an angle of 45°.

[0033] Optionally, the body of the dichroic mirror 12 is flat glass with an optical focal length of 0; wherein one side of the transmission surface of the dichroic mirror 12 is coated with a transmission film for transmitting ultraviolet light; one side of the reflection surface of the dichroic mirror 12 is coated with a reflection film for reflecting three-color light and amber light.

[0034] The transmission surface of the dichroic mirror 12 is used to transmit the ultraviolet light further converged by the second collimating lens 3 to the first focusing lens 13 .

[0035] The three-color light source 8 is used to provide three-color light (i.e., RGB red, green, and blue light) and emit the three-color light to the third collimating lens 9. The three-color light source 8 can use RGB-LED and can emit RGB (red, green, and blue) light of 460nm~630nm, and R, G, and B are three independent lamp beads that can work independently. Among them, the central wavelength of red light can be selected as 630nm, the central wavelength of green light can be selected as 530nm, and the central wavelength of blue light can be selected as 460nm, and the edge light divergence angle of the three-color light is 120°.

[0036] The third collimating lens 9 is a lens with positive optical power, and is used to converge the three-color lights emitted by the three-color light source 8 to the fourth collimating lens 10 .

[0037] The fourth collimating lens 10 is a lens with positive optical power, which is used to further converge the three-color light converged by the third collimating lens 9 to form three-color light perpendicular to the direction from the ultraviolet light source 1 to the light guide rod 15, and incident on the transmission surface of the wave trap plate 11 at an angle of 45°.

[0038] The body of the notch plate 11 is a flat glass with an optical focal length of 0. The transmission surface of the notch plate 11 is coated with a transmission film to transmit the three-color light emitted by the three-color light source 8. The reflection surface of the notch plate 11 is coated with a reflection film to reflect the amber light emitted by the amber light source 4. The transmission surface of the notch plate 11 is used to transmit the three-color light straightened by the fourth collimating lens 10 to the reflection surface of the dichroic mirror 12.

[0039] The amber light source 4 is used to provide amber light and emit the amber light to the fifth collimating lens 5. The amber light source 4 may be a CA-LED, and the edge light divergence angle is 120°; the central wavelength of the emitted amber light may be 600nm.

[0040] The fifth collimating lens 5 is a lens with positive optical power, and is used to converge the amber light emitted by the amber light source 4 to the sixth collimating lens 6 .

[0041] The sixth collimating lens 6 is a lens with positive optical power, and is used to further converge the amber light converged by the fifth collimating lens 5 to form amber light parallel to the direction from the ultraviolet light source 1 to the light guide rod 15 , and converge to the filter 7 .

[0042] Filter 7 is a bandpass filter 7, which is a flat glass with an optical focal length of 0; filter 7 is used to transmit amber light in a narrow band and cut off other wide bands of light (such as transmitting 600nm amber light and cutting off other wide bands of amber light).

[0043] The amber light transmitted through the filter 7 is incident on the reflection surface of the notch plate 11 at an angle of 45°. The amber light is then reflected by the reflection surface of the notch plate 11 at an angle of 90° to the reflection surface of the dichroic mirror 12.

[0044] The reflecting surface of the dichroic mirror 12 is used to reflect the amber light reflected by the notch plate 11 and the transmitted three-color light to the first focusing lens 13 at an angle of 90°.

[0045] The first focusing lens 13 is a lens with positive optical power, and is used to focus the incident ultraviolet light, trichromatic light and amber light onto the second focusing lens 14 .

[0046] The second focusing lens 14 is a lens with positive optical power, and is used to further focus the incident ultraviolet light, three-color light and amber light onto the light guide rod 15 .

[0047] The light guide rod 15 has a focal power of 0 and is disposed at the light focusing point of the second focusing lens 14. Firstly, it is used to stagger the light guide beam and the light focusing point to avoid the high temperature generated by focusing from burning and damaging the light guide beam; secondly, it can play the role of uniform light.

[0048] The basic working principle of the ultraviolet light path is: the ultraviolet light emitted by the ultraviolet light source 1 passes through the first collimating lens 2, the second collimating lens 3, the dichroic mirror 12, the first focusing lens 13, and the second focusing lens 14 in sequence, and is finally coupled into the light guide rod 15. The light guide beam is connected to the light emitting end face of the light guide rod 15, and the light can be coupled into the light guide beam.

[0049] Since the divergence angle of the ultraviolet light source 1 is relatively large (up to 120°), the ultraviolet light must be collimated first to reduce the divergence angle and the spot size, so that the light can be coupled into the light guide. The first collimating lens 2 and the second collimating lens 3 form an ultraviolet light collimating lens group, and the main function of this lens group is to collimate the ultraviolet light with a large angle into parallel light (parallel to the direction from the ultraviolet light source 1 to the light guide rod 15). The ultraviolet light collimating lens group is designed with spherical glass lenses, and can adopt traditional optical cold processing technology, with relatively low cost.

[0050] The collimated parallel light of the ultraviolet light is split by the dichroic mirror 12. The function of the dichroic mirror 12 is to transmit the ultraviolet light and reflect the three-color light and the amber light (therefore, when the ultraviolet light passes through the transmission surface of the dichroic mirror 12, it can reach the first focusing lens 13 through the transmission surface. Because the dichroic mirror 12 is a flat plate and does not provide optical focal length, it will not change the propagation direction of the light, and the ultraviolet light is still collimated light after passing through the dichroic mirror 12.

[0051] The first focusing lens 13 and the second focusing lens 14 form a focusing lens group, and the main function is to focus the collimated light passing through the dichroic mirror 12 and couple it into the light guide rod 15. What needs to be considered here is that the light guide has an NA value and a light aperture. Therefore, the image-side NA of the light converged by the focusing lens group must be less than or equal to the NA value of the light guide, and the focused light spot is less than or equal to the light aperture of the light guide, so that the light can be coupled into the light guide to the maximum extent, which can reduce the loss of light energy. And the focusing lens groups are all spherical glass lens designs, and traditional optical cold processing technology can be used, and the cost is relatively low.

[0052] After passing through the focusing lens group, the ultraviolet light is focused from the original parallel light into a light spot and coupled into the light-entering end face of the light guide rod 15; wherein, the light divergence angle of the edge of the light spot is <70°, and the light spot diameter is <Ø5mm. The ultraviolet light will be reflected on the inner surface of the cylindrical surface of the light guide rod 15, and finally emitted from the light-emitting end face of the light guide rod 15. As long as the light guide is connected to the light-emitting end face of the light guide rod 15, the ultraviolet light can be coupled into the light guide.

[0053] It should be noted that, since the energy and temperature at the focus are very high, if the light-entering end face of the light guide is placed directly at the focus of the light, the extremely high temperature may burn the light guide, so a light guide rod 15 must be added at the focus, and the light guide can be placed on the light-emitting surface of the light guide rod 15, thereby avoiding the focus, protecting the light guide, and extending the service life of the light guide. Moreover, the light is totally reflected inside the light guide rod 15, which can achieve a certain uniform light effect. Therefore, the material of the light guide rod 15 can be an optical glass material that is resistant to high temperatures and has good light transmittance.

[0054] In this way, the entire ultraviolet light path is a straight-through coaxial optical system, and the propagation path of the light is all through. The fully through optical system can minimize the loss of light energy and improve the optical transmission coupling efficiency of ultraviolet light.

[0055] The basic working principle of the three-color optical path is as follows: the three-color light (red, green and blue light can be emitted separately or in combination) emitted by the three-color light source 8 passes through the transmission surface of the third collimating lens 9, the fourth collimating lens 10 and the notch plate 11 in sequence, and is reflected at 90° on the reflection surface of the dichroic mirror 12 to enter the focusing lens group, and after being focused, is coupled into the light guide rod 15. The light guide is connected to the light emitting end surface of the light guide rod 15, and the light can be coupled into the light guide.

[0056] Among them, since the divergence angle of the edge light of the three-color light is 120°, after the three-color light passes through the third collimating lens 9 and the fourth collimating lens 10, the divergence angle of the edge light will change from the original 120° collimation to nearly parallel light (parallel in the direction perpendicular to the ultraviolet light source 1 to the light guide rod 15); then, the three-color light passes through the notch plate 11 at an incident angle of 45°, and the transmitted light is still parallel light; then, the three-color light enters the reflection surface of the dichroic mirror 12 at 45°, and is reflected at an angle of 90° to the focusing lens group composed of the first focusing lens 13 and the second focusing lens 14; after being focused by the focusing lens group, the three-color light is focused from the original parallel light (parallel to the direction from the ultraviolet light source 1 to the light guide rod 15 at this time) into a light spot and coupled into the light incident end face of the light guide rod 15, and the divergence angle of the edge light of the light spot is <70°, and the light spot diameter is <Ø5mm. Then the three-color light will be reflected on the inner surface of the cylinder of the light guide rod 15, and finally emitted from the light emitting end face of the light guide rod 15. As long as the light guide is connected to the light emitting end face of the light guide rod 15, the three-color light can be coupled into the light guide.

[0057] The basic working principle of the amber optical path is as follows: the amber light emitted by the amber light source 4 passes through the fifth collimating lens 5, the sixth collimating lens 6 and the filter 7 in sequence, and is incident on the reflection surface of the notch plate 11 at an angle of 45°, and then the amber light is reflected by the reflection surface of the notch plate 11 at 90° to the reflection surface of the dichroic mirror 12, and then reflected by the reflection surface of the dichroic mirror 12 at 90° to enter the focusing lens group, and after being focused, is coupled into the light guide rod 15. The light guide is connected to the light emitting end face of the light guide rod 15, and the light can be coupled into the light guide.

[0058] Among them, after the amber light passes through the fifth collimating lens 5 and the sixth collimating lens 6, the divergence angle of the edge light will change from the original 120° collimation to nearly parallel light (parallel to the direction from the ultraviolet light source 1 to the light guide rod 15); then, the amber light passes through the filter 7 at an incident angle of 0°, and the transmitted light is still parallel light; then, the amber light reaches the reflection surface of the notch plate 11 at an incident angle of 45°, and then the reflection surface of the notch plate 11 reflects the amber light at 90° to the reflection surface of the dichroic mirror 12, and then reflects the amber light at 90° on the reflection surface of the dichroic mirror 12 into the focusing lens group; after being focused by the focusing lens group, the amber light is focused from the original parallel light into a light spot and coupled into the light incident end face of the light guide rod 15, and the light spot edge light divergence angle is <70°, and the light spot diameter is <Ø5mm. The amber light will be reflected on the inner surface of the cylindrical surface of the light guide rod 15, and finally emitted from the light exit end face of the light guide rod 15. As long as the light guide is connected to the light emitting end face of the light guide rod 15 , the amber light can be coupled into the light guide.

[0059] In this way, ultraviolet light, three-color light and amber light are integrated into one lighting system through clever spatial layout, and finally the light of the three light paths can all be emitted from the light guide rod 15 and the light guide beam, thereby realizing a three-light-path composite gastroenteroscope lighting system of ultraviolet light, three-color light and amber light, while making the overall size of the lighting system relatively small, forming a compact layout structure with high space utilization; and the three light paths can share the same focusing lens group, which not only improves the utilization rate of the focusing lens group, but also reduces the number of lenses required for the three-light-path composite gastroenteroscope lighting system, further reducing the preparation cost of the lighting system.

[0060] Among them, the first collimating lens 2, the second collimating lens 3, the third collimating lens 9, the fourth collimating lens 10, the fifth collimating lens 5, the sixth collimating lens 6, the first focusing lens 13 and the second focusing lens 14 are all designed with spherical lenses (such as spherical glass lenses), and the lens processing methods are all traditional optical cold processing processes, and the cost is much lower than the aspheric glass molding process. Moreover, the lens material can be made of glass material, and the material is very easy to obtain. While achieving low cost, the lighting system can also achieve extremely high optical transmission efficiency and excellent light field distribution uniformity.

[0061] In addition, the combined use of different light sources can provide richer visual information and improve the imaging quality of gastrointestinal endoscopic images. Among them, ultraviolet light is used to enhance the detection of specific types of lesions, such as fluorescently marked lesions; trichromatic light can provide full-spectrum color information, which helps to distinguish different types of tissues and lesions and enhance observation details; amber light is used to reduce reflections and interference and improve image contrast and clarity.

[0062] Among them, through circuit control, the red, green and blue light sources in the three-color light source 8 can be lit and operated independently; of course, the ultraviolet light source 1 and the amber light source 4 can also work independently.

[0063] Optionally, by controlling the on / off states of different light sources in the lighting system of the above-mentioned gastroenteroscope, different gastroenteroscope imaging modes can be combined, for example:

[0064] Mode 1: By controlling the ultraviolet light source 1, the three-color light source 8 (including red, green and blue) and the amber light source 4 to light up together, the lighting system can output a white light mode.

[0065] Mode 2: By controlling the ultraviolet light source 1 and the green light source in the three-color light source 8 to light up together, the illumination system can output the NBI (Narrow Band Imaging) narrow band imaging mode.

[0066] Mode 3: By controlling the red and green light sources and the amber light source 4 in the three-color light source 8 to light up together, the lighting system can output an RDI (Red Dual Imaging) dual red light imaging mode.

[0067] In one embodiment, ultraviolet light, three-color light and amber light are integrated into one lighting system through clever spatial layout, which can provide richer visual information, improve the imaging quality of gastroenteroscopic images, and enable the three light paths to share the same focusing lens group, thereby reducing the number of lenses required to form the lighting system. In addition, the lenses in the lighting system all use spherical lenses with relatively simple processing technology, which greatly reduces the preparation cost of the lighting system. At the same time, by reasonably arranging the lens positions and angles and optimizing the distribution of the light field, the lighting system can provide a uniform light field. Even if spherical lenses are used, the lighting system can still achieve high optical transmission efficiency through precise optical design and adjustment.

[0068] Since the lighting system has good optical properties such as uniform light field and high optical transmission efficiency, it can improve image quality and reduce spot effect while meeting the requirements of low cost and ultraviolet light + three-color light + amber light imaging in the application of gastroenteroscopes, and meet the requirements of high brightness and high lighting uniformity of gastroenteroscopes.

[0069] In one embodiment, based on the above embodiment, the first collimating lens 2 is a meniscus lens, and the concave surface faces the ultraviolet light source 1 and the convex surface faces the second collimating lens 3 .

[0070] In this embodiment, the first collimating lens 2 is a meniscus lens having positive optical power.

[0071] Optionally, the center thickness of the first collimating lens 2 is 15 mm, the radius of curvature of the concave surface is R31.7 mm, the radius of curvature of the convex surface is R17.4 mm, and the diameter is Ø34 mm.

[0072] Since it is necessary to receive as much large-angle light coupled to the ultraviolet light source 1 as possible, the concave surface needs to be close to the ultraviolet light source 1 and the convex surface needs to be far away from the ultraviolet light source 1. In the ultraviolet light collimating lens group, the first collimating lens 2 needs to bear most of the optical focal length to converge the ultraviolet light at large angles. Therefore, a high-refractive-index optical glass material, heavy lanthanum flint glass H-ZLAF50E (high refractive index of 1.8), can be selected, so that the curvature of the lens can be designed to be smaller, which is convenient for processing and production. Both optical surfaces of the lens are spherical designs, and traditional optical cold processing technology can be used, which is relatively low in cost.

[0073] Both optical surfaces can be coated with AR film (anti-reflective film), and the reflectivity in the ultraviolet light band (such as 415nm ultraviolet light) can be <0.5%.

[0074] In one embodiment, based on the above embodiment, the second collimating lens 3 is a plano-convex lens, with its flat surface facing the first collimating lens 2 and its convex surface facing the transmission surface of the dichroic mirror 12 .

[0075] In this embodiment, the second collimating lens 3 is a plano-convex lens with positive optical power.

[0076] Optionally, the center thickness of the second collimating lens 3 is 10 mm, the convex surface curvature radius is R33.3 mm, and the diameter is Ø43 mm.

[0077] The second collimating lens 3 can shape the ultraviolet light passing through the first collimating lens 2 into collimated parallel light. Since the first collimating lens 2 has already assumed most of the optical focal length, the optical focal length of the second collimating lens 3 can be relatively small, so that the optical glass material H-K9L with low refractive index and high transmittance can be selected. In order to save production and processing costs, it can be designed as a plano-convex lens with positive optical focal length, the plane of the plano-convex lens is close to the side of the first collimating lens 2, and the convex surface is away from the side of the first collimating lens 2. And the convex surface is designed to be a spherical surface, using traditional optical cold processing technology, the cost is relatively low.

[0078] Both optical surfaces can be coated with AR film, and the reflectivity in the ultraviolet light band (such as 415nm ultraviolet light) can be <0.5%.

[0079] In one embodiment, based on the above embodiment, the third collimating lens 9 is a meniscus lens, and the concave surface faces the three-color light source 8 and the convex surface faces the fourth collimating lens 10 .

[0080] In this embodiment, the curvature radius, thickness, diameter and optical glass material of the two surfaces of the third collimating lens 9 can be the same as those of the first collimating lens 2 to save mold opening costs. The only difference is the difference in coating. The third collimating lens 9 is coated with AR film on both sides, and the reflectivity in the three-color light band (such as 460~630nm three-color light) is less than 0.5%.

[0081] In one embodiment, based on the above embodiment, the fourth collimating lens 10 is a plano-convex lens, with its flat surface facing the third collimating lens 9 and its convex surface facing the transmission surface of the wave trap plate 11 .

[0082] In this embodiment, the curvature radius, thickness, diameter and optical glass material of the two surfaces of the fourth collimating lens 10 can be the same as those of the second collimating lens 3 to save mold opening costs. The only difference is the difference in coating. The fourth collimating lens 10 is coated with AR film on both sides, and the reflectivity in the three-color light band (such as 460~630nm three-color light) is less than 0.5%.

[0083] In one embodiment, based on the above embodiment, the fifth collimating lens 5 is a meniscus lens, and the concave surface faces the amber light source 4 and the convex surface faces the sixth collimating lens 6 .

[0084] In this embodiment, the curvature radius, thickness, diameter and optical glass material of the two surfaces of the fifth collimating lens 5 can be the same as those of the first collimating lens 2 to save mold opening costs. The only difference is the difference in coating. The fifth collimating lens 5 is coated with AR film on both sides, and the reflectivity in the amber light band (such as 600nm amber light) is <0.5%.

[0085] In one embodiment, based on the above embodiment, the sixth collimating lens 6 is a plano-convex lens, with the flat surface facing the fifth collimating lens 5 and the convex surface facing the filter 7 .

[0086] In this embodiment, the curvature radius, thickness, diameter and optical glass material of the two surfaces of the sixth collimating lens 6 can be the same as those of the second collimating lens 3 to save mold opening costs. The only difference is the difference in coating. The sixth collimating lens 6 is coated with AR film on both sides, and the reflectivity in the amber light band (such as 600nm amber light) is less than 0.5%.

[0087] In one embodiment, based on the above embodiment, the first focusing lens 13 is a plano-convex lens, with a flat surface facing the second focusing lens 14 and a convex surface facing the reflection surface of the dichroic mirror 12 .

[0088] In this embodiment, the first focusing lens 13 is a plano-convex lens with positive optical power.

[0089] Optionally, the center thickness of the first focusing lens 13 is 8.5 mm, the convex surface curvature radius is R42.4 mm, and the diameter is Ø43 mm.

[0090] According to the symmetry of the optical system, the focal length of the first focusing lens 13 should be close to that of the second collimating lens 3. Therefore, the first focusing lens 13 can also be designed as a plano-convex lens with positive focal length, with the convex surface of the lens close to the side of the dichroic mirror 12 and the plane away from the side of the dichroic mirror 12. The focal length that the first focusing lens 13 needs to bear is relatively small, and an optical glass material H-K9L with low refractive index and high transmittance can be selected, and the convex surface is designed to be a spherical surface, and the traditional optical cold processing process is adopted, and the cost is relatively low.

[0091] Both optical surfaces can be coated with AR coating, and the reflectivity of the coating wavelength of 415~630nm light is less than 0.5% (that is, ultraviolet light, three-color light and amber light all need to be enhanced).

[0092] In one embodiment, based on the above embodiment, the second focusing lens 14 is a meniscus lens, and the concave surface faces the light guide rod 15 and the convex surface faces the first focusing lens 13 .

[0093] In this embodiment, the second focusing lens 14 is a meniscus lens with positive optical power.

[0094] Optionally, the center thickness of the second focusing lens 14 is 8 mm, the radius of curvature of the concave surface is R34 mm, the radius of curvature of the convex surface is R21 mm, and the diameter is Ø35 mm.

[0095] According to the symmetry of the optical system, the focal length of the second focusing lens 14 should be close to that of the first collimating lens 2. Because the light spot needs to be converged, the focal length that the second focusing lens 14 needs to bear is also relatively large. Similarly, the second focusing lens 14 can be designed as a meniscus lens with positive focal length, with the convex surface of the lens close to the side of the first focusing lens 13 and the concave surface of the lens away from the side of the first focusing lens 13. The second focusing lens 14 needs to bear most of the focal length in order to converge and couple the light at a large angle into the light guide rod 15. Therefore, in order to couple the light into the light guide rod 15 and the light guide as much as possible, it is necessary to minimize the size of the focused light spot <Ø5mm and the angle of light focusing <70° through the second focusing lens. Considering that the wavelength band 415~630nm needs to have good transmittance, a high refractive index and high transmittance optical glass material can be selected: heavy lanthanum flint glass H-ZLAF50E (high refractive index 1.8), which has excellent transmittance in the wavelength band 415~630nm. Among high-refractive-index optical glasses, the material price is relatively low. Moreover, the use of this material allows the curvature of the lens to be designed to be smaller, making it easier to process and produce, and the two optical surfaces of the lens can be designed to be spherical, using traditional optical cold processing technology, which is relatively low in cost.

[0096] Both optical surfaces can be coated with AR coating, and the reflectivity of the coating wavelength of 415~630nm light is less than 0.5% (that is, ultraviolet light, three-color light and amber light all need to be enhanced).

[0097] The focusing lens group composed of the first focusing lens 13 and the second focusing lens 14 and the ultraviolet light collimating lens group are relatively symmetrical optical system structures. Such an optical structure is more conducive to coupling the light into the light guide rod 15. It should be noted that the image-side NA of the light converged by the focusing lens group must be less than or equal to the NA value of the light guide, and the focused light spot is less than or equal to the aperture of the light guide, so that the light can be coupled into the light guide to the maximum extent and reduce the loss of light energy. In addition, the focusing lens groups are all designed as spherical glass lenses, and traditional optical cold processing technology can be used, and the cost is relatively low.

[0098] In one embodiment, based on the above embodiment, taking the ultraviolet light source 1 emitting 415nm ultraviolet light, the three-color light source 8 emitting three-color light in the wavelength range of 460-630nm, and the amber light source 4 emitting 600nm amber light as an example:

[0099] The dichroic mirror 12 is a flat glass and has a focal length of zero.

[0100] Optionally, the thickness of the dichroic mirror 12 is 1.1 mm, and the material is H-K9L. The dichroic mirror 12 can transmit 415 nm ultraviolet light and reflect three-color light and amber light of 460-630 nm by using multi-layer optical film technology.

[0101] Optionally, the process of the dichroic mirror 12 is optical vacuum evaporation coating, and the substrate can be ordinary optical glass. In order to save costs and improve light transmittance, a high-transmittance optical glass material H-K9L can be selected. It is necessary to coat multiple layers of dielectric film, and double-sided coating is adopted, one of which is coated with AR anti-reflection film, with an incident angle of 45°. The coated surface faces the second collimating lens 3, and the reflectivity of ultraviolet light of 415nm is <0.5%; the other surface is coated with a color separation film, with an incident angle of 45°, and the transmittance of ultraviolet light of 415nm can reach more than 96%, and the reflectivity of three-color light and amber light of 460~630nm can reach more than 98%, and the light energy loss is relatively small. The coated surface faces the first focusing lens.

[0102] Optionally, the wave trap 11 is a flat glass with an optical focal length of 0. The optional thickness is 1.1 mm and the material is H-K9L. The wave trap 11 can reflect 600 nm narrow-band amber light and transmit 460-630 nm three-color light through multi-layer optical thin film technology. The preparation process of the wave trap 11 can be optical vacuum evaporation coating, and the substrate can be ordinary optical glass. In order to save costs and improve light transmittance, a high-transmittance optical glass material H-K9L can be selected. The wave trap plate 11 needs to be coated with multiple layers of dielectric films, and double-sided coating is adopted, one side is coated with AR anti-reflection film, the incident angle is 45°, the coated surface faces the fourth collimating lens 10, and the reflectivity of the three-color light of 460~630nm is <0.5%; the other surface is coated with a color separation film, the incident angle is 45°, the transmittance of the three-color light of 460~630nm can reach more than 96%, and the reflectivity of the narrow-band amber light of 600nm can reach more than 98%, and the coated surface faces the dichroic mirror 12.

[0103] Optionally, the filter 7 is a flat glass with an optical focal length of 0, a thickness of 1.1 mm, and a material of H-K9L.

[0104] The filter 7 can be a 600nm bandpass filter 7, which can achieve the transmission of amber light with a narrow band of 600nm and cut off other wide-band light through multi-layer optical thin film technology. The preparation process of the filter 7 can be optical vacuum evaporation coating, and the substrate can be ordinary optical glass. In order to save costs and improve light transmittance, a high-transmittance optical glass material H-K9L can be selected. The filter 7 needs to be coated with a multi-layer dielectric film, and a double-sided coating is adopted. One side is coated with an AR anti-reflection film, the incident angle is 0°, and the coated surface faces the sixth collimating lens 6. The reflectivity of the amber light of 600nm is <0.5%; the other surface is coated with a narrow bandpass film, the incident angle is 0°, and the transmittance of the amber light of 600nm can reach more than 96%, and the transmittance of other wide-band light is <1%. The coated surface faces the reflective surface of the notch plate 11.

[0105] In one embodiment, based on the above embodiment, the light guide rod 15 may be a glass cylinder.

[0106] Optionally, the optical focal length of the light guide rod 15 is 0, the thickness is 10 mm, the diameter is Ø5 mm, and the material is H-K9L.

[0107] Optionally, the diameter of the light guide rod 15 should be consistent with the light aperture of the light guide beam, such as Ø5 mm, so that the coupling efficiency between the light guide beam and the optical system can be maximized.

[0108] The light guide rod 15 can be made of ordinary optical glass. In order to save costs and improve light transmittance, a high-transmittance optical glass material H-K9L can be selected.

[0109] As long as the light guide is connected to the light emitting end face of the light guide rod 15, the ultraviolet, amber and three-color light can be coupled into the light guide.

[0110] In addition, the present application further proposes a gastroenteroscope, which includes the lighting system of the gastroenteroscope described in the above-mentioned embodiment. The specific structure of the lighting system refers to the above-mentioned embodiment. Since the present gastroenteroscope adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0111] In summary, a gastroenteroscope lighting system and a gastroenteroscope provided in the embodiments of the present application integrate ultraviolet light, three-color light and amber light into one lighting system through a clever spatial layout, which can provide richer visual information, improve the imaging quality of the gastroenteroscope image, and enable the three light paths to share the same focusing lens group, thereby reducing the number of lenses required to form the lighting system. The lenses in the lighting system all use spherical lenses with relatively simple processing technology, which greatly reduces the preparation cost of the lighting system. At the same time, by reasonably arranging the lens positions and angles and optimizing the distribution of the light field, the lighting system can provide a uniform light field. Even if a spherical lens is used, the lighting system can still achieve high optical transmission efficiency through precise optical design and adjustment.

[0112] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0113] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A lighting system for a gastroenteroscopy, characterized in that: The illumination system is used to achieve coupling and convergence of three light sources, namely, ultraviolet light, trichromatic light and amber light, so as to improve imaging quality and reduce light spot effect; The lighting system comprises: a first collimating lens, a second collimating lens, a dichroic mirror, a first focusing lens and a second focusing lens arranged in sequence from the ultraviolet light source to the light guide rod, wherein the transmission surface of the dichroic mirror faces the second collimating lens at an angle of 45°, and the reflection surface of the dichroic mirror faces the first focusing lens at an angle of 45°; In a direction perpendicular to the direction from the ultraviolet light source to the light guide rod, a third collimating lens, a fourth collimating lens and a notch plate are sequentially arranged between the three-color light source and the reflecting surface of the dichroic mirror; wherein the notch plate is parallel to the dichroic mirror, and the reflecting surface of the notch plate faces the dichroic mirror, and the transmitting surface of the notch plate faces the fourth collimating lens; In the direction parallel to the direction from the ultraviolet light source to the light guide rod, between the amber light source and the reflecting surface of the notch plate, a fifth collimating lens, a sixth collimating lens and a filter are arranged in sequence; the filter is a 600nm bandpass filter, which is used to transmit the 600nm narrowband amber light and cut off other wide-band light; the notch plate is used to reflect the 600nm narrowband amber light and transmit the light emitted by the three-color light source; Wherein, the first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the fifth collimating lens, the sixth collimating lens, the first focusing lens and the second focusing lens are all spherical lenses; The first focusing lens is a plano-convex lens, with the flat surface facing the second focusing lens and the convex surface facing the reflecting surface of the dichroic mirror; the center thickness of the first focusing lens is 8.5 mm, the convex surface curvature radius is R42.4 mm, and the diameter is Ø43 mm; The second focusing lens is a meniscus lens, and the concave surface faces the light guide rod, and the convex surface faces the first focusing lens; the center thickness of the second focusing lens is 8mm, the concave curvature radius is R34mm, the convex curvature radius is R21mm, and the diameter is Ø35mm; the second focusing lens makes the size of the focusing spot formed by the first focusing lens less than Ø5mm, and the angle of light focusing is less than 70°; The thickness of the light guide rod is 10 mm and the diameter is Ø5 mm, and the diameter of the light guide rod is consistent with the aperture of the light guide beam.

2. The lighting system for a gastroenteroscopy according to claim 1, characterized in that: The first collimating lens is a meniscus lens, with a concave surface facing the ultraviolet light source and a convex surface facing the second collimating lens.

3. The lighting system for a gastroenteroscopy according to claim 1 or 2, characterized in that: The second collimating lens is a plano-convex lens, with a flat surface facing the first collimating lens and a convex surface facing the transmission surface of the dichroic mirror.

4. The lighting system for a gastroenteroscopy according to claim 1, characterized in that: The third collimating lens is a meniscus lens, with a concave surface facing the three-color light source and a convex surface facing the fourth collimating lens.

5. The lighting system for a gastroenteroscope according to claim 1 or 4, characterized in that: The fourth collimating lens is a plano-convex lens, with a flat surface facing the third collimating lens and a convex surface facing the transmission surface of the notch plate.

6. The lighting system for a gastroenteroscope according to claim 1, characterized in that: The fifth collimating lens is a meniscus lens, with a concave surface facing the amber light source and a convex surface facing the sixth collimating lens.

7. The lighting system for a gastroenteroscope according to claim 1 or 6, characterized in that: The sixth collimating lens is a plano-convex lens, with a flat surface facing the fifth collimating lens and a convex surface facing the filter.

8. A gastroenteroscopy, characterized in that: A lighting system comprising a gastroenteroscope as described in any one of claims 1 to 7.

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