4K fluorescent endoscope objective lens optical system
The 4K fluorescence endoscope objective optical system, which combines an anti-telephoto structure and specific optical power lenses, solves the problems of complex structure, high cost and low imaging clarity in the existing technology, and achieves high-resolution and low-cost imaging effects.
Patent Information
- Application Number
- CN202422625396.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The existing 4K fluorescence laparoscope objective system has problems such as complex structure, high cost, low optical central angle resolution and severe stray light, resulting in low imaging clarity and difficulty in achieving ultra-high-definition imaging in both white light and fluorescence bands.
The 4K fluorescence endoscope objective optical system adopts an anti-telephoto structure, including a sapphire protective lens, a negative optical power lens, a prism or a turning prism, a positive optical power plano-convex doublet, a positive optical power triplet and a positive optical power doublet. By combining specific optical power and dispersion coefficient, the type and number of lenses are simplified, field curvature, vertical axis chromatic aberration and distortion are corrected, and stray light is reduced.
It achieves high-resolution, low-cost imaging, while correcting chromatic aberration and distortion, reducing stray light, and adapting to the objective requirements of 4K resolution fluorescence laparoscopes, with an F number less than 5, distortion less than 10%, and a field of view ≥78°.
Smart Images
Figure CN223438478U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of objective lens structure of laparoscope, specifically to a kind of for 4K fluorescence endoscope objective lens optical system, belong to endoscope optical technical field in medical instrument. BACKGROUND
[0002] 4K fluorescence laparoscope is used for clinical examination abdominal cavity disease and treatment, can carry out careful observation to the tissue structure on the focus surface, and under direct vision, material is taken or positioned, greatly improve the accuracy of abdominal cavity disease diagnosis. 4K ultra-high definition, fluorescence laparoscope and other high-end medical equipment will be more and more widely in future clinical demand;4K fluorescence laparoscope objective lens system, as an important part of fluorescence laparoscope optical system, plays a very important role in correcting system field curvature, axial chromatic aberration and distortion.
[0003] There are the following problems in the prior art: since the design work band of fluorescence laparoscope is wider than that of white light, the definition is mainly determined by the F number of the system, and the spatial resolution is higher under the same system parameters. However, the wide working band width and small F number will introduce larger axial chromatic aberration and axial chromatic aberration;Make the current market few hard mirror laparoscope products that can simultaneously realize white light band and fluorescence band ultra-high definition imaging, and the objective lens part structure has the problems of complex structure, high cost and low optical central angle resolution, and there is also stray light, so that the final fluorescence imaging definition is not high. SUMMARY
[0004] The utility model aims at: provide a kind of optical system structure can be simplified, the whole endoscope system field curvature is corrected well, axial chromatic aberration, distortion and reduce stray light, and can adapt to the objective lens requirement of 4K resolution fluorescence laparoscope 4K fluorescence endoscope objective lens optical system.
[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is: a kind of 4K fluorescence endoscope objective lens optical system, its innovation point is: objective lens optical system is overall reverse telephoto structure,
[0006] Specifically including sapphire protective lens, negative power lens, prism or turning prism, positive power flat convex cemented lens, positive power three cemented lens and positive power double cemented lens arranged along the light propagation direction,
[0007] The plane or convex surface of one side of the negative power lens is located at one side of the sapphire protective lens, and the concave surface of the other side thereof is cemented with one side of the prism or turning prism, the other side of the prism or turning prism is cemented with the plane of the positive power flat convex cemented lens, the convex surface of the positive power flat convex cemented lens is located at 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 at one side of the convex surface of the positive power double cemented lens.
[0008] In the above technical solution, the positive focal length plano-convex double cemented lens is cemented by a plano lens and a convex lens, and the other side of the prism or the turning prism is cemented with the plane of the plano lens, and the convex surface of the convex lens is located on the convex surface side of the positive focal length plano-convex double cemented lens.
[0009] In the above technical solution, the positive focal length plano-convex double cemented lens is cemented by a plano lens and a convex lens, and the other side of the prism or the turning prism is cemented with the plane of the plano lens, and the convex surface of the convex lens is located on the convex surface side of the positive focal length plano-convex double cemented lens.
[0010] In the above technical solution, the positive focal length plano-convex double cemented lens is cemented by a plano lens and a convex lens, and the other side of the prism or the turning prism is cemented with the plane of the plano lens, and the convex surface of the convex lens is located on the convex surface side of the positive focal length plano-convex double cemented lens.
[0011] In the above technical solution, the negative focal length lens is a negative lens with a focal length of-0.55 to-0.5, and the ratio of 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 focal length lens, f 物镜 is the focal length of the objective optical system as a whole,
[0012] The focal length f2 of the positive focal length plano-convex double cemented lens satisfies 1.65≤f2 / f 物镜 ≤6.6,
[0013] The focal length f3 of the positive focal length triple cemented lens satisfies 7≤f3 / f 物镜 ≤28,
[0014] The focal length f4 of the first positive focal length double cemented lens satisfies 5≤f4 / f 物镜 ≤20.
[0015] In the above technical solution, the concave surface on the other side of the negative focal length lens is a spherical surface or an even aspherical surface structure.
[0016] The positive effects of the utility model are as follows: after the 4K fluorescence endoscope objective optical system is used, the objective optical system as a whole is a reverse telephoto structure,
[0017] Specifically, it comprises a sapphire protective lens, a negative focal length lens, a prism or a turning prism, a positive focal length plano-convex double cemented lens, a positive focal length triple cemented lens and a positive focal length double cemented lens arranged along the light propagation direction,
[0018] The plane or convex surface of the negative power lens on one side is located on one side of a sapphire protective lens, and the concave surface on the other side is glued with one side of a prism or a turning prism, the other side of the prism or the turning prism is glued with a plane of a positive power plane-convex glued lens, the convex surface of the positive power plane-convex glued lens is located on one side of a convex surface of a positive power three-glued lens, and the plane of the positive power three-glued lens is located on one side of a convex surface of a positive power double-glued lens,
[0019] The utility model uses in time with relay lens system and eyepiece system in endoscope optical system, specific working principle is, object forms image through objective lens optical system, then through relay lens system, image surface is transmitted to eyepiece system end, and with eyepiece system pupil alignment, the image is observed to the eye,
[0020] The objective lens optical system of the utility model is combined with the lens of specific focal length and suitable dispersion coefficient group through the reverse telephoto structure, realizes high resolution, low cost at the same time, and well corrects the whole endoscope system field curvature, axial chromatic aberration, distortion and reduces stray light, and simplifies the lens type of objective lens group, the number of lens and spacer, reduces the production cost and does not affect the image quality,
[0021] Meanwhile, the utility model still can adapt to 4K resolution fluorescent laparoscope objective lens requirement, and F number is less than 5, distortion is less than 10%, and field of view angle is 78 ° . BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a structure schematic diagram of a specific embodiment of the utility model;
[0023] Figure 2 It is the MTF curve diagram of the optical system of the utility model;
[0024] Figure 3 It is the distortion diagram of the optical system of the utility model;
[0025] Figure 4 It is the illumination diagram of the optical system of the utility model. DETAILED DESCRIPTION
[0026] The utility model is further explained below in combination with the drawings and the embodiments given, but is not limited to this.
[0027] As Figure 1 , 2 , 3, 4 show, a kind of 4K fluorescent endoscope objective lens optical system, objective lens optical system is reverse telephoto structure as a whole,
[0028] Specifically, the lenses include a sapphire protective lens 1, a negative power lens 2, a prism or a turning prism 3, a positive power plano-convex cemented lens 4, a positive power three-cemented lens 5, and a positive power double-cemented lens 6 arranged along the direction of light propagation,
[0029] The plane or the convex surface on one side of the negative power lens 2 is located on one side of the sapphire protective lens 1, and the concave surface on the other side thereof is cemented with one side of the prism or the turning prism 3, the other side of the prism or the turning prism 3 is cemented with the plane of the positive power plano-convex cemented lens 4, the convex surface of the positive power plano-convex cemented lens 4 is located on one side of the convex surface of the positive power three-cemented lens 5, and the plane of the positive power three-cemented lens 5 is located on one side of the convex surface of the positive power double-cemented lens 6.
[0030] As shown in Figure 1 , in order to facilitate the cementing of the prism or the turning prism and reduce the assembly difficulty, the positive power plano-convex cemented lens 4 is integrated by a plano lens and a convex lens, the other side of the prism or the turning prism 3 is cemented with 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 three-cemented lens 5.
[0031] Further, as shown in Figure 1 , the positive power three-cemented lens 5 is integrated by two convex lenses and one concave lens, and the concave surfaces on both 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 4, and the plane of the other convex lens is located on one side of the convex surface of the positive power double-cemented lens 6. The advantages of this design are: first, the chromatic aberration can be well corrected, and second, in the endoscope system, since the adjustment in the lens assembly process cannot be achieved, the three-cemented mode ensures the mutual machining and positional tolerance during the element processing, thereby reducing the assembly difficulty in the later stage.
[0032] Further, as shown in Figure 1 , the positive power double-cemented lens 6 is integrated by a convex lens and a concave lens, and the plane of the positive power three-cemented lens 5 is located on one side of the convex surface of the convex lens. The advantages of this design are that the chromatic aberration, field curvature and telecentricity can be well corrected, and the assembly difficulty in the later stage is reduced.
[0033] Further, the accumulated vertical aberration and field curvature of the relay system are corrected and balanced, the dispersion, chromatic focal shift and optical distortion of the entire white light waveband to the fluorescent waveband are corrected by the cemented lenses of various dispersion coefficients, the lens types, the number of lenses and spacers of the objective lens group are simplified, the production cost is reduced, and the image quality is not affected, the negative power lens 2 is a negative lens with a power of -0.55 to -0.5, and the focal length f1 / f 物镜 ratio satisfies -1.2≤f1 / f 物镜≤-0.3, wherein f1 is the focal length of the negative power lens 2, f 物镜 is the focal length of the objective optical system as a whole,
[0034] The positive power plano-convex doublet lens 4 has a focal length f2 that satisfies 1.65 ≤ f2 / f 物镜 ≤ 6.6,
[0035] The positive power triplet lens 5 has a focal length f3 that satisfies 7 ≤ f3 / f 物镜 ≤ 28,
[0036] The first positive power doublet lens 6 has a focal length f4 that satisfies 5 ≤ f4 / f 物镜 ≤ 20.
[0037] Further, the concave surface on the other side of the negative power lens 2 is a spherical surface or an even aspheric surface. When the concave surface on the other side of the negative power lens 2 is an even aspheric surface, the main function is to better correct the field area and distortion of the system, and to balance aberrations.
[0038] The detailed structure parameters of the optical system of the utility model are as follows:
[0039]
[0040]
[0041] When the concave surface on the other side of the negative power lens 2 is an even aspheric surface,
[0042] The calculation formula of the even aspheric surface is as follows:
[0043]
[0044] Wherein R is the radius of curvature, K is the conic coefficient, A4, A6, A8, A10, A12, A14, A16 are respectively the 4th, 6th, 8th, 10th, 12th, 14th, 16th order coefficients of the aspheric surface.
[0045] In the embodiment, the aspheric surface parameters of No. 4 in the above table are as follows:
[0046] conic=-0.488, A4=5.595*10 -3 -4, A6=8.565*10 -3 -4, A8=-4.936*10 -3 -4, A10=-3.396*
[0047] 10 -3 A12=2.821*10 -3 A14=-4.417*10 -4 .
[0048] Further, as shown in Figure 3 the optical system has a distortion of less than 10% over the full field of view, as shown in Figure 4 the optical system has an illumination of greater than 0.95 over the full field of view.
[0049] The utility model uses when with the relay lens system and the eyepiece system in endoscope optical system is used in matching, specific working principle is, object forms image through objective lens optical system, then the relay lens system is transmitted to the eyepiece system end with the eyepiece system pupil alignment, is observed to the image by human eye,
[0050] The objective lens optical system of the utility model is combined with the lens of specific focal power and the dispersion coefficient group through the reverse telephoto structure, realizes high resolution and low cost, corrects the field curvature, the vertical axis chromatic aberration, the distortion and reduces the stray light of entire endoscope system, simplifies the lens type of objective lens group, the number of lens and spacer, reduces the production cost and does not affect the image quality,
[0051] Meanwhile, the utility model still can adapt 4K resolution fluorescence laparoscope objective lens requirement, and F number is less than 5, distortion is less than 10%, and field of view angle is 78 ° .
[0052] The above ideal embodiments according to the utility model are inspired, and the related staff can make various changes and modifications without deviating from the technical idea of the utility model according to the above description.The technical scope of the utility model is not limited to the content in the specification, and must be determined according to the scope of claims.
Claims
1. A 4K fluorescence endoscope objective optical system, characterized by: The objective optical system is an anti-telephoto structure. Specifically, it comprises a sapphire protective lens (1) arranged along the light propagation direction, a negative power lens (2), a prism or a turning prism (3), a positive power plano-convex composite lens (4), a positive power triple composite lens (5) and a positive power double composite lens (6), The plane or convex surface on one side of the negative power lens (2) is located on one side of the sapphire protective lens (1), and the concave surface on the other side thereof is glued to one side of a prism or a steering prism (3), and the other side of the prism or the steering prism (3) is glued to the plane of a positive power plano-convex glued lens (4), the convex surface of the positive power plano-convex glued lens (4) is located on one side of the convex surface of a positive power triple glued lens (5), and the plane of the positive power triple glued lens (5) is located on one side of the convex surface of a positive power double glued lens (6).
2. The 4K fluorescence endoscope objective optical system according to claim 1, characterized in that: The positive focal power plano-convex composite lens (4) is composed of a plano lens and a convex lens glued together into one body, the other side of the prism or turning prism (3) 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 focal power triplet composite lens (5).
3. The 4K fluorescence endoscope objective optical system according to claim 1, wherein: The positive power triplet (5) 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 (4), and the plane of the other convex lens is located on the convex side of the positive power doublet (6).
4. The 4K fluorescence endoscope objective optical system according to claim 1, wherein: The positive power doublet (6) is formed by gluing a convex lens and a concave lens, and the plane of the positive power triplet (5) is located on the convex side of the convex lens.
5. The 4K fluorescence endoscope objective optical system according to claim 1, wherein: The negative optical power lens (2) 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 (2), f 物镜 is the focal length of the objective optical system as a whole, The focal length f2 of the positive focal power plano-convex composite lens (4) satisfies 1.65≤f2 / f 物镜 ≤6.6, The focal length f3 of the positive power triplet lens (5) satisfies 7≤f3 / f 物镜 ≤28, The focal length f4 of the positive power doublet lens (6) satisfies 5≤f4 / f 物镜 ≤20.
6. The 4K fluorescence endoscope objective optical system according to claim 1, characterized in that: The concave surface on the other side of the negative power lens (2) is a spherical surface or an even-order aspherical surface structure.