CN215687653U - A three-chip fluorescent dual-band endoscope zoom adapter - Google Patents
A three-chip fluorescent dual-band endoscope zoom adapter Download PDFInfo
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- CN215687653U CN215687653U CN202022856774.8U CN202022856774U CN215687653U CN 215687653 U CN215687653 U CN 215687653U CN 202022856774 U CN202022856774 U CN 202022856774U CN 215687653 U CN215687653 U CN 215687653U
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Abstract
本实用新型公开一种三晶片荧光双波段内窥镜变焦适配器，涉及生物医学技术领域，包括从物侧至像侧沿光轴依次设置的前固定组、变倍组、补偿组和后固定组，所述后固定组的后面设置有红外光路和可见光路；所述变倍组可沿所述光轴移动，用于改变焦距；所述补偿组可沿所述光轴移动，用于进行伴随变倍的像面变动的校正和调焦。本实用新型提高成像的清晰度及对比度。
The utility model discloses a three-chip fluorescent dual-band endoscope zoom adapter, which relates to the technical field of biomedicine. , the rear fixed group is provided with an infrared light path and a visible light path; the zoom group can move along the optical axis to change the focal length; the compensation group can move along the optical axis for accompanying Correction and focus adjustment of image plane changes in zoom. The utility model improves the sharpness and contrast of imaging.
Description
Technical Field
The utility model relates to the technical field of biomedicine, in particular to a three-wafer fluorescence dual-band endoscope zooming adapter.
Background
Traditional endoscope adapter is the fixed focus visible light wave band camera lens, and the doctor needs to change the adapter of different focus (20mm, 25mm, 35mm, 45mm) to the actual observation demand of different endoscopes. The Near Infrared (NIR) indocyanine green (ICG) fluorescence method is widely applied to cancer tumor detection abroad, the detection rate of early cancer can be greatly improved through a fluorescence endoscope, the detection rate is improved by 4-5 times compared with that of a conventional method, and human pathological tissues, cancer tissues and the like can be distinguished and diagnosed through fluorescence spectrum characteristics.
And no related fluorescent endoscope products exist at present in China.
Therefore, a three-chip fluorescence dual-band endoscope zoom adapter is needed to solve the above problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a three-wafer fluorescence dual-band endoscope zooming adapter, which is used for solving the problems in the prior art and improving the imaging definition and contrast.
In order to achieve the purpose, the utility model provides the following scheme: the utility model provides a three-wafer fluorescent dual-band endoscope zooming adapter which comprises a front fixed group, a zooming group, a compensation group and a rear fixed group which are sequentially arranged from an object side to an image side along an optical axis, wherein an infrared light path and a visible light path are arranged behind the rear fixed group; the zoom group can move along the optical axis and is used for changing the focal length; the compensation group is movable along the optical axis for correction of image plane variation accompanying magnification variation and focusing.
Preferably, the front fixed group comprises a first lens and a second lens, the first lens having a negative focal power and the second lens having a positive focal power; the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the object side surface of the second lens is a convex surface and the image side surface of the second lens is a concave surface; the image side surface of the first lens and the object side surface of the second lens are mutually glued to form a first cemented lens;
the first cemented mirror satisfies vd2-vd1>22, where vd1 and vd2 are the d-line abbe numbers of the first lens and the second lens, respectively.
Preferably, the variable power group comprises a third lens and a fourth lens, the third lens has positive focal power, and the fourth lens has negative focal power; the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, and the object side surface of the fourth lens is a convex surface and the image side surface of the fourth lens is a concave surface; the image side surface of the third lens and the object side surface of the fourth lens are mutually glued to form a second cemented lens;
the second cemented mirror satisfies vd3-vd4>18, where vd3 and vd4 are the d-line abbe numbers of the third lens and the fourth lens, respectively.
Preferably, the compensation group comprises a fifth lens and a sixth lens, the fifth lens has a negative focal power, and the sixth lens has a negative focal power; the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the object side surface of the sixth lens is a concave surface and the image side surface of the sixth lens is a concave surface; the image side surface of the fifth lens and the object side surface of the sixth lens are mutually glued to form a third cemented lens;
the third cemented mirror satisfies vd6-vd5>19, where vd5 and vd6 are the d-line abbe numbers of the fifth lens and the sixth lens, respectively.
Preferably, a diaphragm is arranged between the compensation group and the rear fixed group.
Preferably, the rear fixed group includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens has positive focal power, and the object side surface is a convex surface and the image side surface is a convex surface; the eighth lens has negative focal power, and the object side surface is a concave surface and the image side surface is a convex surface; the ninth lens has positive focal power, and the object side surface is a convex surface and the image side surface is a convex surface; the tenth lens has negative focal power, and the object side surface is a concave surface and the image side surface is a convex surface;
the seventh lens and the eighth lens are cemented to form a fourth cemented lens, and the ninth lens and the tenth lens are cemented to form a fifth cemented lens;
the fourth cemented mirror satisfies vd7-vd8>22, where vd7 and vd8 are the d-line abbe numbers of the seventh lens and the eighth lens, respectively;
the fifth cemented mirror satisfies vd9-vd10>30, where vd9 and vd10 are the d-line abbe numbers of the ninth lens and the tenth lens, respectively.
Preferably, the infrared light path comprises a beam splitter prism, a compensating mirror and an infrared CCD; the beam splitter prism comprises two congruent isosceles right triangular prisms which are mutually attached, and the inclined surfaces of the isosceles right triangular prisms are coated with films and used for reflecting visible light and transmitting infrared light; the compensating mirror adopts plate glass, is attached to the beam splitting prism and is used for compensating the optical path of the infrared light path, and the infrared light enters the infrared CCD after passing through the compensating mirror.
Preferably, the visible light path includes three wafers, and the three wafers are used for realizing beam splitting and filtering of the visible light from the beam splitter prism and splitting the visible light into three beams of red, green and blue light.
Preferably, the three wafers comprise a first prism, a second prism and a third prism which are glued together, the first prism is plated with a red light waveband reflecting film, the third prism is plated with a green light reflecting film, and the second prism is plated with a blue light antireflection film.
Preferably, the variable magnification group and the compensation group are mounted on a mobile station.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model adopts the four-group structure, simplifies the number of lenses of each group, shortens the focusing stroke of the lens, reduces the total length of the lens to be within 80mm, realizes the continuous change of the focal length, and simultaneously utilizes three wafers to further improve the imaging definition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is an enlarged view of a three-wafer structure of the present invention;
FIG. 3 is an optical schematic of the present invention at its longest focal length;
FIG. 4 is an optical schematic of the present invention at intermediate focal length;
FIG. 5 is an optical schematic of the present invention at the shortest focal length;
FIG. 6 is a graph of the MTF of 0.450-0.680 μm at the longest focal length of the present invention;
FIG. 7 is a plot of 0.450-0.680 μm dots at the longest focal length of the present invention;
FIG. 8 is a graph of the MTF of 0.810-0.850 μm at the longest focal length of the present invention;
FIG. 9 is a plot of 0.810-0.850 μm at the longest focal length of the present invention;
FIG. 10 is a graph of the MTF of 0.450-0.680 μm at the intermediate focus of the present invention;
FIG. 11 is a dot array plot of 0.450-0.680 μm at mid focus in accordance with the present invention;
FIG. 12 is a graph of the MTF of 0.810-0.850 μm at the intermediate focus of the present invention;
FIG. 13 is a dot-column diagram of 0.810-0.850 μm at a medium focal length of the present invention;
FIG. 14 is a graph of the MTF of 0.450-0.680 μm at the shortest focal length of the present invention;
FIG. 15 is a dot-column diagram of 0.450-0.680 μm at the shortest focal length of the present invention;
FIG. 16 is a graph of the MTF of 0.810-0.850 μm at the shortest focal length of the present invention;
FIG. 17 is a dot-column diagram of 0.810-0.850 μm at the shortest focal length of the present invention;
description of the drawings: l1-first lens, L2-second lens, L3-third lens, L4-fourth lens, L5-fifth lens, L6-sixth lens, L7-seventh lens, L8-eighth lens, L9-ninth lens, L10-tenth lens, L11-beam splitter prism, L12-compensator, L13-infrared CCD, 1-first prism, 2-second prism, 3-third prism, G1-front fixed group, G2-variable-magnification group, G3-compensator, G4-rear fixed group, A1-infrared optical path and A2-visible optical path.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In the present invention, the term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or Code V. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
Example one
As shown in fig. 1 to 17, this embodiment provides a three-wafer fluorescence dual-band endoscope zoom adapter, which is a four-component zoom lens, and uses the matching movement of each lens to implement the focal length change of the adapter lens, uses a beam splitter L11 to implement the imaging of the visible light and infrared light dual-band, and uses a three-wafer layer-by-layer scanning technique to improve the imaging definition.
In this embodiment, the three-wafer fluorescence dual-band endoscope zoom adapter includes a front fixed group G1, a zoom group G2, a compensation group G3, a stop, a rear fixed group G4, a beam splitter prism L11, a compensation mirror L12, an infrared optical path a1 formed by an infrared CCD, and a visible optical path a2 formed by three wafers, which are sequentially arranged along an optical axis from an object side to an image side. In this embodiment, each of the first lens element L1 through the tenth lens element L10 includes an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The front fixed group G1 includes: the first lens L1 with negative focal power and the second lens L2 with positive focal power, the image side surface of the first lens L1 and the object side surface of the second lens L2 are mutually cemented to form a first cemented lens;
the object side surface of the first lens L1 is a convex surface, the image side surface is a concave surface, the ratio of the focal length of the first lens L1 to the effective aperture of the object side surface is preferably (-3.10, -2.89), and the refractive index of the first lens L1 is preferably greater than 1.6;
the object-side surface of the second lens L2 is convex, the image-side surface is concave, the ratio of the focal length of the second lens L2 to the effective aperture of the object-side surface is preferably (1.78, 1.90), and the refractive index of the second lens L2 is preferably greater than 1.5;
the first cemented lens is formed by cementing two positive and negative focal power cemented lenses, the chromatic aberration of an optical system is greatly reduced through the matching of the refractive index and the Abbe number of the lens material, the requirement of the consumer-grade lens on chromatic aberration reduction is realized, and the requirements are further met: vd2-vd1>22, wherein vd1 and vd2 are the dispersion coefficients of the first lens L1 and the second lens L2 respectively in the d line;
the variable magnification group G2 includes: the third lens L3 with positive focal power and the fourth lens L4 with negative focal power, the image side surface of the third lens L3 and the object side surface of the fourth lens L4 are mutually cemented to form a second cemented lens;
the object-side surface of the third lens L3 is convex, the image-side surface is concave, the ratio of the focal length of the third lens L3 to the effective aperture of the object-side surface is preferably (2.58, 2.83), and the refractive index of the third lens L3 is preferably greater than 1.5;
the object side surface of the fourth lens L4 is a convex surface, the image side surface is a concave surface, the ratio of the focal length of the fourth lens L4 to the effective aperture of the object side surface is preferably (-3.26, -2.98), and the refractive index of the fourth lens L4 is preferably greater than 1.6;
the second cemented mirror further satisfies: vd3-vd4>18, wherein vd3 and vd4 are the dispersion coefficients of the third lens L3 and the fourth lens L4 respectively at the d line;
the compensation group G3 includes: a fifth lens L5 with negative focal power and a sixth lens L6 with negative focal power, wherein the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 are mutually cemented to form a third cemented lens;
the object side surface of the lens of the fifth lens L5 is a concave surface, the image side surface is a convex surface, the ratio of the focal length of the fifth lens L5 to the effective aperture of the object side surface is preferably (-2.00, -1.85), and the refractive index of the fifth lens L5 is preferably greater than 1.6;
the object side surface of the lens of the sixth lens L6 is a concave surface, the image side surface is also a concave surface, the ratio of the focal length of the sixth lens L6 to the effective aperture of the object side surface is preferably (-4.91, -4.58), and the refractive index of the sixth lens L6 is preferably greater than 1.5;
the third cemented mirror further satisfies: vd6-vd5>19, wherein vd5 and vd6 are the d-line abbe numbers of the fifth lens L5 and the sixth lens L6 respectively;
the diaphragm is arranged between the compensation group G3 and the rear fixed group G4;
the rear fixed group G4 includes: the fourth cemented lens is cemented with a fifth cemented lens, a seventh lens L7 with positive power and an eighth lens L8 with negative power are cemented to form the fourth cemented lens, and a ninth lens L9 with positive power and a tenth lens L10 with negative power are cemented to form the fifth cemented lens;
the object-side surface and the image-side surface of the seventh lens element L7 are convex, the ratio of the focal length of the seventh lens element L7 to the effective aperture of the object-side surface is preferably (3.40, 4.25), and the refractive index of the seventh lens element L7 is preferably greater than 1.5;
the object-side surface of the eighth lens element L8 is concave, the image-side surface is also convex, the ratio of the focal length of the eighth lens element L8 to the effective aperture of the object-side surface is preferably (-5.57, -5.20), and the refractive index of the eighth lens element L8 is preferably greater than 1.6;
the fourth cemented mirror further satisfies: vd7-vd8>22, wherein vd7 and vd8 are the dispersion coefficients of the seventh lens L7 and the eighth lens L8 respectively at the d line;
the object-side surface and the image-side surface of the ninth lens L9 are convex, the ratio of the focal length of the ninth lens L9 to the effective aperture of the object-side surface is preferably (2.34, 2.84), and the refractive index of the ninth lens L9 is preferably greater than 1.5;
the tenth lens L10 has a concave object-side surface and a convex image-side surface, the ratio of the focal length of the tenth lens L10 to the effective aperture of the object-side surface is preferably (-5.62, -4.17), and the refractive index of the tenth lens L10 is preferably greater than 1.7;
the fifth cemented mirror further satisfies: vd9-vd10>30, wherein vd9 and vd10 are the abbe numbers of the ninth lens L9 and the tenth lens L10 at d line respectively;
in an infrared light path, a beam splitter prism L11 splits the two-waveband light from a tenth lens L10, the transmitted infrared light enters a compensating mirror L12 to reach infrared CCDL13, and the visible light waveband is reflected to enter the three wafers;
the three wafers are a beam splitting prism group, the beam splitting and filtering of visible light are realized by utilizing three prisms, the visible light reflected by the beam splitting prism L11 is divided into red, blue and green light which are respectively imaged on a red CCD, a green CCD and a blue CCD, and the imaging definition is improved by utilizing a layer-by-layer scanning technology;
specifically, the three wafers comprise a first prism 1, a second prism 2 and a third prism 3 which are glued together, in order to achieve the light splitting effect, the first prism 1 is plated with a red light wave band reflecting film and transmits other visible light, the third prism 3 is plated with a green light reflecting film and transmits other visible light wave bands, the second prism 2 is plated with a blue light antireflection film and other visible light absorption films, and the other wave band light cannot be transmitted;
the three-chip fluorescent dual-band endoscope zoom adaptive lens has a zoom range which satisfies 1.25< f/BFL <3.13, wherein f is a focal length, and BFL is a back focal length of each focal length.
In this embodiment, the zoom group G2 and the compensation group G3 are mounted on a mobile station, and are driven by the mobile station to move, and the specific structure of the mobile station is selected according to the working requirement; in the present embodiment, the zoom group G2 changes linearly during the focal length changing process, and the compensation group G3 changes non-linearly accordingly. In this embodiment, the image-side rear distance of the second lens L2, the image-side rear distance of the fourth lens L4, and the stop-surface rear distance are three variations in zooming.
In this embodiment, two more lenses are used for the first lens L1 to the tenth lens L10 to be cemented together for better controlling chromatic aberration, and only the above ten three-chip fluorescence dual-band endoscope zoom adapter are used; this embodiment can realize clear color image, and is good to transfer function management and control, high resolution, high analysis, and the image acutance is high, and the image is even, and the switching flexibility is strong.
Hereinafter, various numerical data regarding the zoom lens of the embodiment are shown.
The EFL is 50mm, the FNo is 5 and the BFL is 16mm when the focal length is longest;
when the focal length is medium, EFL is 35mm, FNo is 7, and BFL is 16 mm;
when the focal length is shortest, EFL is 20mm, FNo is 4, BFL is 16 mm;
table 1 shows the structural parameters of the lens of this embodiment:
| surface number | Surface type | Radius of curvature | Thickness of | Material |
| S1 | Spherical surface | 41.474 | 3.000 | F7 |
| S2 | Spherical surface | 19.315 | 3.000 | BAK1 |
| S3 | Spherical surface | 576.385 | 17.435～4.553 | |
| S4 | Spherical surface | 17.440 | 2.500 | BAK1 |
| S5 | Spherical surface | 58.367 | 1.500 | BASF1 |
| S6 | Spherical surface | 19.409 | 2.571～21.077 | |
| S7 | Spherical surface | -9.695 | 1.500 | BASF1 |
| S8 | Spherical surface | -3.737 | 2.500 | BAK1 |
| S9 | Spherical surface | 25.474 | 1.358 | |
| Diaphragm | - | Inf | 11.067～0.198 | |
| S10 | Spherical surface | 33.891 | 2.965 | BAK1 |
| S11 | Spherical surface | -6.224 | 1.200 | F7 |
| S12 | Spherical surface | -18.783 | 8.704 | |
| S13 | Spherical surface | 12.783 | 3.500 | BK7 |
| S14 | Spherical surface | -16.334 | 1.200 | SF15 |
| S15 | Spherical surface | -88.435 | 16.000 |
Table 2 shows the zoom parameters of the lens of this embodiment
TABLE 3 parameters of beam splitter prism, compensator, and three wafers
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (10)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114153104A (en) * | 2022-02-09 | 2022-03-08 | 嘉兴中润光学科技股份有限公司 | High-magnification anti-shake camera device and zoom lens |
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| CN114153104A (en) * | 2022-02-09 | 2022-03-08 | 嘉兴中润光学科技股份有限公司 | High-magnification anti-shake camera device and zoom lens |
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