4K fluorescent endoscope optical system

Abstract

The utility model relates to a 4K fluorescent endoscope optical system, which comprises an objective lens system, a relay lens system and an eyepiece system which are sequentially arranged along the light propagation direction, and is characterized in that the objective lens system is of a reverse long-distance structure; the system comprises a sapphire protection lens, a negative focal power lens, a prism or a steering prism, a positive focal power plano-convex cemented lens, a positive focal power triple cemented lens and a first positive focal power double cemented lens which are arranged along a light propagation direction, the relay lens system comprises n relay lens groups, and each relay lens group is of a double telecentric structure. And the eyepiece system is arranged in the light transmission direction and is formed by symmetrically arranging two doublet rod lenses, n is an odd number, the eyepiece system is of an object space telecentric structure, and the eyepiece system comprises a second positive-focal-power doublet lens, a positive-focal-power lens and a sapphire lens which are glued into a whole in the light transmission direction. The structure of an optical system can be simplified, production and processing cost can be reduced, and 4K ultra-high-definition fluorescent laparoscopic imaging can be realized at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to an optical system, concretely relates to a kind of for 4K fluorescence endoscope optical system, belong to laparoscope technical field. BACKGROUND

[0002] 4K fluorescence laparoscope is a kind of laparoscope, and when being used in cooperation with specific cold light source, camera system host and ICG, it is beneficial to lesion area positioning development and quantitative analysis, widens its clinical use effect and use range, is used to determine the site, size, appearance and range of the existence of lesion when being used in clinical examination of intra-abdominal disease and treatment, and can carefully observe the tissue structure on the lesion surface, and under direct vision, material is taken or positioned, greatly improve the accuracy of intra-abdominal disease diagnosis, update, development and make up the deficiency of traditional diagnosis and treatment method.4K ultra-high definition, fluorescence laparoscope and other high-end medical equipment are more and more widely needed in future clinical demand, and it is an important development direction of laparoscope.

[0003] There are the following problems in the prior art: since the design working waveband of fluorescence laparoscope is wider than that of white light, the definition is mainly determined by the F number of system, and the spatial resolution is higher under the same system parameters with smaller F number. However, wide working waveband width and small F number will introduce larger axial chromatic aberration and sagittal chromatic aberration; the accumulated field curvature and sagittal chromatic aberration correction of relay system is further increased in difficulty, and these parameters will restrict the definition of optical system or increase the complexity of optical system, so that there are few hard mirror laparoscope products in the current market that can simultaneously realize white light waveband and fluorescence waveband ultra-high definition imaging, and there are problems of complex optical system structure, high cost and insufficient imaging definition, which limits use, affects detection accuracy and increases hospital and patient use cost. SUMMARY

[0004] The utility model aims at: provide a kind of 4K fluorescence endoscope optical system that can simplify optical system structure, reduce production and processing cost, and can realize 4K ultra-high definition fluorescence laparoscope imaging simultaneously.

[0005] To achieve the above object, the technical scheme of the utility model is as follows: a kind of 4K fluorescence endoscope optical system, including objective lens system, relay lens system and eyepiece system that are sequentially arranged along the direction of light propagation, the relay lens system is located between objective lens system and eyepiece system, and its innovation point is that:

[0006] The objective lens system is a reverse telephoto structure, and the objective lens system comprises, in the order of light propagation, a sapphire protective lens, a negative power lens, a prism or a turning prism, a positive power plano-convex cemented lens, a positive power three-cemented lens and a first positive power double-cemented lens, the plane or the convex surface on one side of the negative power lens is located on one side of the sapphire protective lens, and the concave surface on the other side of the negative power lens is cemented with one side of the prism or the turning prism, the other side of the prism or the turning prism is cemented with the plane of the positive power plano-convex cemented lens, the convex surface of the positive power plano-convex cemented lens is located on one side of the convex surface of the positive power three-cemented lens, and the plane of the positive power three-cemented lens is located on one side of the convex surface of the first positive power double-cemented lens,

[0007] The relay lens system comprises n groups of relay lens groups, and each group of relay lens groups is a double-telecentric structure, the relay lens group is composed of two double-cemented rod lenses arranged symmetrically, and the plane of the first positive power double-cemented lens is located on one side of the relay lens group, wherein n is an odd number,

[0008] The eyepiece lens system is a material side telecentric structure, and the eyepiece lens system comprises, in the order of light propagation and being cemented into one body, a second positive power double-cemented lens, a positive power lens and a sapphire lens, the other side of the relay lens group and the convex side of the positive power lens are respectively located on the two sides of the second positive power double-cemented lens, and the concave surface of the positive power lens is located on one side of the sapphire lens.

[0009] In the above technical solution, the positive power plano-convex cemented lens is composed of a plane lens and a convex lens cemented into one body, the other side of the prism or the turning prism is cemented with the plane of the plane lens, and the convex surface of the convex lens is located on one side of the convex surface of the positive power three-cemented lens.

[0010] In the above technical solution, the positive power three-cemented lens is composed of two convex lenses and a concave lens cemented into one body, and the concave surfaces on the two sides of the concave lens are respectively cemented with one convex lens, the convex surface of one of the convex lenses is located on one side of the convex surface of the positive power plano-convex cemented lens, and the plane of the other convex lens is located on one side of the convex surface of the first positive power double-cemented lens.

[0011] In the above technical solution, the first positive power double-cemented lens is composed of a convex lens and a concave lens, the plane of the positive power three-cemented lens is located on one side of the convex surface of the convex lens, and the plane of the concave lens is located on one side of the relay lens group.

[0012] In the above technical solution, the double-cemented rod lens of each relay lens group is composed of a meniscus rod lens and a double-convex lens cemented into one body by ultraviolet light-sensitive glue.

[0013] In the above technical solution, the second positive power double bonded lens is composed of a double convex lens and a concave lens bonded together by ultraviolet photosensitive glue. The convex side of the double convex lens is located on the other side of the relay lens group, and the convex surface of the concave lens is located on the convex side of the positive power lens.

[0014] In the above technical solution, the negative power lens is a negative lens with a power of -0.55 to -0.5, and its focal length is f1 / f 物镜 The ratio satisfies -1.2≤f1 / f 物镜 ≤-0.3, where f1 is the focal length of the negative power lens, f 物镜 is the focal length of the objective lens system,

[0015] The focal length f2 of the positive power plano-convex doublet lens satisfies 1.65≤f2 / f 物镜 ≤6.6,

[0016] The focal length f3 of the positive power triplet lens satisfies 7≤f3 / f 物镜 ≤28,

[0017] The focal length f4 of the first positive power doublet lens satisfies 5≤f4 / f 物镜 ≤20.

[0018] In the above technical solution, the refractive index of the double-cemented rod mirror is 1.5≤n≤1.7, and the focal length is between 25mm and 100mm.

[0019] In the above technical solution, the focal lengths of the second positive power doublet lens and the positive power lens are both between 25 mm and 100 mm.

[0020] In the above technical solution, the concave surface on the other side of the negative power lens is a spherical surface or an even-order aspherical structure.

[0021] The positive effects of the present invention are as follows: after adopting the 4K fluorescence endoscope optical system of the present invention, since the objective lens system of the present invention is a reverse telephoto structure, and the objective lens system includes a sapphire protective lens, a negative power lens, a prism or a steering prism, a positive power plano-convex glued lens, a positive power triplet and a first positive power doublet arranged along the light propagation direction, the plane or convex surface on one side of the negative power lens is located on one side of the sapphire protective lens, and the concave surface on the other side thereof is glued to one side of the prism or the steering prism, the other side of the prism or the steering prism is glued to the plane of the positive power plano-convex glued lens, the convex surface of the positive power plano-convex glued lens is located on the convex side of the positive power triplet, and the plane of the positive power triplet is located on the convex side of the first positive power doublet.

[0022] The relay mirror system comprises n relay mirror groups, each relay mirror group is a double-telecentric structure, the relay mirror group is composed of two double-cemented rod mirrors arranged symmetrically, and the plane of the first positive focal length double-cemented mirror is located on one side of the relay mirror group, wherein n is an odd number,

[0023] The eyepiece system is a telecentric structure on the object side, and the eyepiece system comprises a second positive focal length double-cemented mirror, a positive focal length lens and a sapphire lens which are cemented into one body along the light propagation direction, the other side of the relay mirror group and the convex side of the positive focal length lens are respectively located on both sides of the second positive focal length double-cemented mirror, and the concave side of the positive focal length lens is located on one side of the sapphire lens,

[0024] The working principle of the utility model is that an object is imaged through the objective lens system, then the image plane is transmitted to the eyepiece system end through the relay mirror system, and is aligned with the eyepiece system pupil, and the image is observed by the human eye,

[0025] The objective lens system is used to correct and balance the accumulation of the vertical aberration and the field curvature accumulated by the relay system, the glass cemented lens with multiple dispersion coefficients is used to correct the dispersion, chromatic focal shift and optical distortion of the system in the entire white light waveband to fluorescent waveband, the lens type, the number of lenses and the number of spacers of the objective lens group are simplified, the production cost is reduced, and the image quality is not affected,

[0026] The relay mirror system adopts a symmetrical structure, the refractive index, dispersion coefficient and focal length combination of the rod mirror group are adjusted, the vertical aberration and the telecentricity are balanced, the aberration is mainly concentrated on the field curvature, the lens type and the number of the rod mirror group of the relay group are simplified and reduced, the production cost is reduced, and the final imaging effect of the entire system is not affected,

[0027] The eyepiece system can realize the pupil matching of the adapter under the condition of ensuring the image quality, the eyepiece system is reduced to the second positive focal length double-cemented lens and the positive focal length lens to the greatest extent, the production cost is reduced to the greatest extent, and the image quality is not affected,

[0028] Therefore, the utility model can simplify the optical system structure, reduce the production and processing cost, and realize 4K ultra-high-definition fluorescence laparoscope imaging at the same time, that is, the utility model has the advantages of low cost and high performance, can simplify the optical system structure, reduce the number of system lens groups, reduce the production and processing cost, and realize 4K ultra-high-definition fluorescence laparoscope imaging at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a specific embodiment of the utility model;

[0030] Figure 2 is a structural schematic diagram of the objective lens system of the utility model;

[0031] Figure 3 is a structure schematic diagram of the relay lens system of the utility model;

[0032] Figure 4 is a structure schematic diagram of the relay lens group of the utility model;

[0033] Figure 5 is a structure schematic diagram of the eyepiece system of the utility model;

[0034] Figure 6 is the MTF curve diagram of the optical system of the utility model;

[0035] Figure 7 is the distortion diagram of the optical system of the utility model;

[0036] Figure 8 is the illumination diagram of the optical system of the utility model. DETAILED DESCRIPTION

[0037] The utility model is further explained below in combination with the drawings and the embodiments given, but is not limited to this.

[0038] As shown in Figure 1 , 2 , 3, 4, 5, 6, 7, 8, a kind of 4K fluorescence endoscope optical system, including successively arranged along the direction of light propagation objective lens system 1, relay lens system 2 and eyepiece system 3, the relay lens system 2 is located between objective lens system 1 and eyepiece system 3,

[0039] The objective lens system 1 is reverse distance structure, and objective lens system 1 includes sapphire protective lens 11, negative power lens 12, prism or turning prism 13, positive power flat convex cemented lens 14, positive power three cemented lens 15 and first positive power double cemented lens 16 arranged along the direction of light propagation, the plane or convex surface of one side of the negative power lens 12 is located in one side of sapphire protective lens 11, and the concave surface of its other side is cemented with one side of prism or turning prism 13, the other side of the prism or turning prism 13 is cemented with the plane of positive power flat convex cemented lens 14, the convex surface of the positive power flat convex cemented lens 14 is located in the convex surface side of positive power three cemented lens 15, the plane of the positive power three cemented lens 15 is located in the convex surface side of first positive power double cemented lens 16,

[0040] The relay lens system 2 includes n groups of relay lens group, and each group of relay lens group is double telecentric structure, the relay lens group is composed of two double cemented rod lenses arranged symmetrically, the plane of the first positive power double cemented lens 16 is located in one side of relay lens group, wherein, n is odd number,

[0041] The eyepiece system 3 is a far object side, and the eyepiece system 3 includes a second positive focal power double cemented lens 31, a positive focal power lens 32 and a sapphire lens 33 which are cemented together along the light propagation direction, the other side of the relay lens group and the convex side of the positive focal power lens 32 are respectively located on both sides of the second positive focal power double cemented lens 31, and the concave side of the positive focal power lens 32 is located on one side of the sapphire lens 33.

[0042] As shown in Figure 2 , in order to facilitate the better cementing of the prism or the turning prism and reduce the assembly difficulty, the positive focal power plano-convex cemented lens 14 is cemented together by a plano lens and a convex lens, the other side of the prism or the turning prism 13 is cemented with the plane of the plano lens, and the convex surface of the convex lens is located on the convex side of the positive focal power three-cemented lens 15.

[0043] As shown in Figure 2 , the positive focal power three-cemented lens 15 is cemented together by two convex lenses and a concave lens, and the concave surfaces on both sides of the concave lens are respectively cemented with a convex lens, the convex surface of one of the convex lenses is located on the convex side of the positive focal power plano-convex cemented lens 14, and the plane of the other convex lens is located on the convex side of the first positive focal power double cemented lens 16. The advantages of this design are: first, it can correct chromatic aberration well, and second, in the endoscope system, since the adjustment during the lens assembly process cannot be achieved, the three-cemented lens mode ensures the mutual processing and position tolerance during element processing, thereby reducing the assembly difficulty in the later stage.

[0044] As shown in Figure 2 , the first positive focal power double cemented lens 16 is cemented by a convex lens and a concave lens, the plane of the positive focal power three-cemented lens 15 is located on the convex side of the convex lens, and the plane of the concave lens is located on one side of the relay lens group. The advantages of this design are that it can correct chromatic aberration, field curvature and control the telecentricity well, and reduce the assembly difficulty in the later stage.

[0045] Further, as shown in Figure 3 , 4 , the double-cemented rod lens of each relay lens group is cemented together by a meniscus rod lens 21 and a double convex lens 22 by ultraviolet light sensitive glue. The advantages of this design are that it can correct aberration well, the material does not affect the transmittance, the structure is simple and convenient to assemble.

[0046] Further, as shown in Figure 5 , the second positive focal power double cemented lens 31 is cemented by a double convex lens and a concave lens by ultraviolet light sensitive glue, the convex side of the double convex lens is located on the other side of the relay lens group, and the convex side of the concave lens is located on the convex side of the positive focal power lens 32.

[0047] Further, the correction and balance of the accumulated axial aberration and the accumulation of the field curvature by the relay system are corrected by the glass cemented lens with multiple dispersion coefficients, the dispersion, chromatic aberration and optical distortion of the whole white light band to the fluorescent band are corrected, the lens type, the lens and the number of the spacer ring of the objective lens group are simplified, the production cost is reduced and the image quality is not affected, the negative power lens 12 is a negative lens with a power of-0.55 to-0.5, the focal length f1 / f 物镜 The ratio satisfies-1.2≤f1 / f 物镜 ≤-0.3, wherein f1 is the focal length of the negative power lens 5, f 物镜 is the focal length of the objective lens system 1,

[0048] The focal length f2 of the positive power plano-convex double cemented lens 14 satisfies 1.65≤f2 / f 物镜 ≤6.6,

[0049] The focal length f3 of the positive power three-cemented lens 15 satisfies 7≤f3 / f 物镜 ≤28,

[0050] The focal length f4 of the first positive power double cemented lens 16 satisfies 5≤f4 / f 物镜 ≤20.

[0051] Further, the control of the telecentricity of the relay system and the better balance of other aberrations except the field curvature reduce the production cost and do not affect the final whole system imaging effect, the refractive index of the double cemented rod lens is 1.5≤n≤1.7, and the focal length is between 25mm and 100mm.

[0052] Further, while balancing the aberration and controlling the telecentricity, the structure is simple and the production cost is low, the focal length of the second positive power double cemented lens 31 and the positive power lens 32 is between 25mm and 100mm.

[0053] Further, the concave surface on the other side of the negative power lens 12 is a spherical surface or an even aspherical surface structure. When the concave surface on the other side of the negative power lens 2 is an even aspherical surface structure, the main function is to correct the field area and the distortion of the system and balance the aberration.

[0054] The detailed structure parameters of the optical system of the utility model are as follows:

[0055]

[0056]

[0057] When the concave surface on the other side of the negative power lens 12 is an even aspherical surface structure,

[0058] The calculation formula of the even aspherical surface is as follows:

[0059]

[0060] Where R is the radius of curvature, K is the cone coefficient, and A4, A6, A8, A10, A12, A14, and A16 are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th orders of the aspheric surface, respectively.

[0061] In this embodiment, the aspheric parameters of sequence number 4 in the above table are as follows:

[0062] conic=-0.488,A4=5.595*10 -3 ,A6=8.565*10 -3 ,A8=-4.936*10 -3 ,A10=-3.396*

[0063] 10 -3 ,A12=2.821*10 -3 ,A14=-4.417*10 -4 .

[0064] Further, such as Figure 6 As shown in FIG. 1 , the MTF curve of the optical system of the present invention is shown when the adapter focal length is 15.5 mm. Figure 7 As shown, the distortion of the optical system is less than 10% under the full field of view. Figure 8 As shown, the illumination of the optical system is greater than 0.95 under the full field of view.

[0065] The working principle of the utility model is that the object is imaged through the objective lens system, and then the image plane is transmitted to the eyepiece system end through the relay lens system, and is aligned with the pupil of the eyepiece system, and the image is observed by the human eye.

[0066] The objective lens system is used to correct and balance the vertical axis aberration and field curvature accumulated by the relay system. The dispersion, chromatic focal shift and optical distortion of the entire white light band to the fluorescence band are corrected by glass cemented lenses with various dispersion coefficients. This simplifies the types of lenses, the number of lenses and spacers in the objective lens group, reduces production costs and does not affect image quality.

[0067] The relay mirror system adopts a symmetrical structure. By adjusting the refractive index, dispersion coefficient and focal length combination of the rod lens group, vertical aberration and telecentricity are balanced, so that the aberration is mainly concentrated on the field curvature, the types and number of lenses in the relay group rod lens group are simplified and reduced, and the production cost is reduced without affecting the final imaging effect of the entire system.

[0068] The eyepiece system guarantees the pupil matching of the adapter under the condition of image quality, reduces the eyepiece system to the second positive-power doublet lens and the positive-power lens to the maximum, and reduces the production cost to the maximum without affecting the image quality,

[0069] Therefore, the utility model can simplify the optical system structure, reduce the production and processing cost, and realize 4K super high definition fluorescence laparoscope imaging at the same time.

[0070] Based on the above ideal embodiments of the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A 4K fluorescence endoscope optical system, comprising an objective lens system (1), a relay lens system (2), and an eyepiece lens system (3) arranged in sequence along a light propagation direction, wherein the relay lens system (2) is located between the objective lens system (1) and the eyepiece lens system (3), and characterized in that: The objective lens system (1) is a reverse telephoto structure, and the objective lens system (1) comprises a sapphire protective lens (11), a negative power lens (12), a prism or a steering prism (13), a positive power plano-convex glued lens (14), a positive power triple glued lens (15), and a first positive power double glued lens (16) arranged along the light propagation direction, wherein the plane or convex surface of one side of the negative power lens (12) is located on one side of the sapphire protective lens (11), and the concave surface of the other side thereof is glued to one side of the prism or the steering prism (13), the other side of the prism or the steering prism (13) is glued to the plane of the positive power plano-convex glued lens (14), the convex surface of the positive power plano-convex glued lens (14) is located on the convex side of the positive power triple glued lens (15), and the plane of the positive power triple glued lens (15) is located on the convex side of the first positive power double glued lens (16). The relay lens system (2) includes n relay lens groups, and each relay lens group is a double telecentric structure. The relay lens group is composed of two double-cemented rod mirrors arranged symmetrically. The plane of the first positive focal power double-cemented mirror (16) is located on one side of the relay lens group, wherein n is an odd number. The eyepiece system (3) is an object-side telecentric structure, and comprises a second positive-power doublet lens (31), a positive-power lens (32), and a sapphire lens (33) that are glued together along the light propagation direction; the other side of the relay lens group and the convex side of the positive-power lens (32) are respectively located on both sides of the second positive-power doublet lens (31), and the concave surface of the positive-power lens (32) is located on one side of the sapphire lens (33).

2. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The positive power plano-convex cemented lens (14) is formed by gluing a plano lens and a convex lens into one body, the other side of the prism or the turning prism (13) is glued to the plane of the plano lens, and the convex surface of the convex lens is located on one side of the convex surface of the positive power triplet cemented lens (15).

3. The 4K fluorescence endoscope optical system according to claim 1, wherein: The positive power triplet (15) is formed by gluing two convex lenses and one concave lens together, and the concave surfaces on both sides of the concave lens are respectively glued together with a convex lens, wherein the convex surface of one convex lens is located on the convex side of the positive power plano-convex glued lens (14), and the plane of the other convex lens is located on the convex side of the first positive power doublet (16).

4. The 4K fluorescence endoscope optical system according to claim 1, wherein: The first positive power doublet (16) is formed by gluing a convex lens and a concave lens together, the plane of the positive power triplet (15) is located on the convex side of the convex lens, and the plane of the concave lens is located on the side of the relay lens group.

5. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The double-glued rod mirror of each relay mirror group is formed by gluing a meniscus rod mirror (21) and a double convex lens (22) into one body through ultraviolet photosensitive glue.

6. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The second positive power doublet lens (31) is composed of a double convex lens and a concave lens glued together by ultraviolet photosensitive glue, the convex side of the double convex lens is located on the other side of the relay lens group, and the convex surface of the concave lens is located on the convex side of the positive power lens (32).

7. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The negative optical power lens (12) is a negative lens with an optical power of -0.55 to -0.5, and its focal length is f1 / f 物镜 The ratio satisfies -1.2≤f1 / f 物镜 ≤-0.3, where f1 is the focal length of the negative power lens (12), f 物镜 is the focal length of the objective lens system (1), The focal length f2 of the positive focal power plano-convex composite lens (14) satisfies 1.65≤f2 / f 物镜 ≤6.6, The focal length f3 of the positive power triplet lens (15) satisfies 7≤f3 / f 物镜 ≤28, The focal length f4 of the first positive power doublet lens (16) satisfies 5≤f4 / f 物镜 ≤20.

8. The 4K fluorescence endoscope optical system according to claim 1 or 5, characterized in that: The refractive index of the double-cemented rod mirror is 1.5≤n≤1.7, and the focal length is between 25mm and 100mm.

9. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The focal lengths of the second positive power doublet lens (31) and the positive power lens (32) are both between 25 mm and 100 mm.

10. The 4K fluorescence endoscope optical system according to claim 1, characterized in that: The concave surface on the other side of the negative power lens (12) is a spherical surface or an even-order aspherical surface structure.

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