CN112790721A - High-resolution lateral imaging miniature endoscopic microscope objective set and probe - Google Patents

High-resolution lateral imaging miniature endoscopic microscope objective set and probe Download PDF

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CN112790721A
CN112790721A CN202110123542.8A CN202110123542A CN112790721A CN 112790721 A CN112790721 A CN 112790721A CN 202110123542 A CN202110123542 A CN 202110123542A CN 112790721 A CN112790721 A CN 112790721A
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CN112790721B (en
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王立强
郭飞
杨青
游兴海
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Zhejiang University ZJU
Zhejiang Lab
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Zhejiang Lab
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    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
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Abstract

The invention relates to a micro endoscopic microscope objective group and a probe for high-resolution lateral imaging, which comprise a first prism, a first lens, a second lens, a third lens, a fourth lens and an imaging surface which are sequentially configured from an object side, wherein each lens of the micro objective group has adaptive parameters so that the working distance is 40-80 mu m under the wavelength of 488nm when the clear aperture of the micro objective group is less than 0.8mm, the magnification is 1.9-2.1, and the field of view can reach 290 mu m. The lateral imaging micro endoscopic objective group can observe the tissue structure on the side wall of a narrow pancreatic duct and can better cooperate with an optical fiber bundle to realize the observation of tissue cells by utilizing a confocal technology.

Description

High-resolution lateral imaging miniature endoscopic microscope objective set and probe
Technical Field
The invention relates to the technical field of medical images, in particular to a micro endoscopic objective lens group and a probe for high-resolution lateral imaging.
Background
The key problem of multi-organ diagnosis and treatment integration is narrow space multi-azimuth stereo imaging. The optical fiber endoscope is a major breakthrough of the flexible endoscope technology, so that the flexible imaging probe can flexibly steer and observe in vivo, however, in a narrow area, due to the small space, the probe can not be bent at a large angle, so that the detection omission often occurs in the areas such as the pancreatic duct and the like clinically, and the optical fiber endoscope technology for multi-aspect observation still has an urgent practical problem so far. Therefore, in a narrow space, a micro lateral imaging device with high resolution at the cellular level is important for early diagnosis of canceration in the pancreatic tract and other regions.
In order to solve the above problems, chinese patent publication No. CN 110764226 a discloses a large-field micro-objective lens, which has an outer diameter of 2.6mm and includes, in order from an object end to an image end along an optical axis direction thereof, a first lens with positive dioptric intensity, a second lens with positive dioptric intensity, a third lens, a fourth lens with positive dioptric intensity, a fifth lens with negative dioptric intensity, a sixth lens with negative dioptric intensity, and an image plane. The device can be matched with a fluorescence confocal endoscope for use, enters a human body through a working channel of a conventional enteroscope to carry out clinical diagnosis on intestinal diseases, but cannot realize lateral imaging.
Further, as disclosed in chinese patent publication No. CN 107003502 a, an endoscope objective optical system is disclosed which can change the field of view in an arbitrary direction without bending the endoscope even in a narrow space. The endoscope objective optical system is composed of an optical path deflection prism group and a lens group, and the visual field direction of the endoscope objective optical system is made variable by moving the prisms in the optical path deflection prism group. The device can change the visual field to any direction without bending the endoscope, but the diameter of the device exceeds 5mm, and the device can not enter the narrow part of the cavity channel in the human body.
At present, no endoscope equipment capable of entering narrow cavities such as the pancreatic duct and the like and simultaneously realizing lateral imaging exists at home and abroad, a miniature endoscopic microscope group and a probe for high-resolution lateral imaging are designed, and the miniature endoscopic microscope group and the probe have small size and lateral imaging capability and have practical significance and good application prospect in early detection of pancreatic duct canceration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a micro endoscopic objective lens group and a probe which can be matched with an optical fiber bundle to observe high-resolution lateral imaging of a cell structure.
The application discloses a micro endoscopic microscope objective group for high-resolution lateral imaging, which sequentially comprises a first prism, a first lens, a second lens, an opening diaphragm, a third lens, a fourth lens and an imaging surface from the object side; the first prism is a 45-degree right-angle prism and is provided with a first object end surface, a first reflecting surface and a first image end surface; the first lens is a plano-convex lens and is provided with a second object end surface and a second image end surface; the second lens is a double-cemented lens formed by combining a positive lens and a negative lens, the first lens is provided with a third object end surface and a third image end surface, the second lens is provided with a fourth object end surface and a fourth image end surface, and the third image end surface and the fourth object end surface are closely superposed; the third lens is a meniscus lens and is provided with a fifth object end surface and a fifth image end surface; the fourth lens is a convex flat lens and is provided with a sixth object end surface and a sixth image end surface; the second and sixth image end surfaces are flat surfaces, the second, third, fourth, fifth and sixth object end surfaces are convex surfaces, the fourth and fifth object end surfaces are concave surfaces, the clear aperture of the high-resolution side-imaging micro-endoscope objective lens group is less than 0.8mm, and the high-resolution side-imaging micro-endoscope objective lens group satisfies the following relations:
0.9<fdou/f<1.6；
0.5<Las/L0<0.6；
wherein f isdouIs the focal length of the second lens, f is the high resolution lateral directionEffective focal length, L, of an imaging micro-endoscope objective lens group0The distance of the micro endoscopic objective group for high-resolution side imaging from the first object end surface of the first prism to the opening diaphragm along the optical axis, and Las is the distance of the micro endoscopic objective group for high-resolution side imaging from the first object end surface of the first prism to the imaging surface along the optical axis;
preferably, the first prism is made of medium-refractive-index high-hardness glass, the first lens is made of low-refractive-index glass, the second lens is made of a combination of high-refractive-index low-dispersion-coefficient glass and high-refractive-index high-dispersion-coefficient glass, the third lens is made of high-refractive-index glass, and the fourth lens is made of high-refractive-index glass.
Preferably, the first prism, the first lens, the second lens, the third lens, and the fourth lens satisfy the following conditions: R21S >0, R22S < 0; R31S >0, R32S < 0; R42S < R41S < 0; R51S > R52S > 0; R62S > R61S > 0; wherein R21S is the radius of curvature of the second end surface of the first lens; R22S is the radius of curvature of the second image end surface of the first lens; R31S is the radius of curvature of the third object end surface of the second lens; R32S is the radius of curvature of the third image end surface of the second lens; R41S is a radius of curvature of a fourth object end surface of the second lens; R42S is a radius of curvature of a fourth image end surface of the second lens; R51S is a radius of curvature of a fifth object end surface of the third lens; R52S is a radius of curvature of a fifth image end surface of the third lens; R61S is a radius of curvature of a sixth object end surface of the fourth lens; R62S is a radius of curvature of a sixth image end surface of the fourth lens.
Preferably, the high-resolution side-imaging micro-endoscope objective lens group satisfies the following relationship: 1.1< Lst/La < 1.3;
wherein Lst is an optical axial distance from the second object end surface of the first lens to the aperture stop, and La is an optical axial distance from the second object end surface of the first lens to the fourth image end surface of the second lens.
Preferably, the high-resolution side-imaging micro-endoscope objective lens group satisfies the following relationship: 1.2< La/f < 2.1;
la is a distance on an optical axis from the second end surface of the first lens to the fourth image end surface of the second lens, and f is an effective focal length of the micro endoscopic objective lens group for high-resolution lateral imaging.
Preferably, the high-resolution side-imaging micro-endoscope objective lens group satisfies the following relationship: 0.2<fb/f<0.4；
Wherein f isbThe distance from the vertex of the sixth image end surface of the fourth lens to the focus of the high-resolution side imaging micro endoscopic objective group, and f is the effective focal length of the high-resolution side imaging micro endoscopic objective group.
The application also discloses a probe, including lens cone and protection gasket, the inside miniature endoscopic microscope objective group that is equipped with high resolution side direction formation of image of lens cone, the front end side of lens cone is equipped with into the light mouth, it is located the first object terminal surface of first prism to go into the light mouth, the front end of lens cone is equipped with the protection gasket.
Preferably, a plurality of spacing rings and an optical fiber bundle for imaging are arranged in the lens barrel, the optical fiber bundle is located at the rear end of the fourth lens, and the spacing rings include a first spacing ring located between the first lens and the second lens, a second spacing ring located between the second lens and the third lens, a third spacing ring located between the third lens and the fourth lens, and a fourth spacing ring located between the fourth lens and the optical fiber bundle.
Preferably, the side wall of the lens barrel is provided with an observation hole for conveniently determining the position of the end face of the optical fiber during assembly.
Preferably, the number of the observation holes is 2, and the two observation holes are arranged at opposite positions on the side wall of the lens barrel.
The invention has the beneficial effects that: the high-resolution miniature microscope objective group capable of laterally imaging for the tiny orifices of the human body can perform fluorescence imaging under the excitation of laser with the wavelength of 488nm by means of fluorescent substances, and can conveniently observe the side walls of the orifices within the working distance of 40-80 mu m; the micro microscope objective has 2 times of magnification, so that the micro microscope objective can be better matched with an optical fiber bundle to realize the observation of tissue cells.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic view of an optical path structure of a micro endoscopic objective lens group for high resolution lateral imaging according to the present invention;
FIG. 2 is a schematic view of a high resolution side imaging micro-objective endoscope probe according to the present invention;
FIG. 3 is a plot of image spherical aberration, image field curvature and distortion curves for example 1;
FIG. 4 is the MTF curve of example 1;
FIG. 5 is a plot of image spherical aberration, image field curvature and distortion curves for example 2;
FIG. 6 is the MTF curve of example 2;
FIG. 7 is a plot of image spherical aberration, image field curvature and distortion curves for example 3;
FIG. 8 is the MTF curve of example 3;
FIG. 9 is a plot of image spherical aberration, image field curvature and distortion curves for example 4;
FIG. 10 is the MTF curve of example 4;
FIG. 11 is a plot of image spherical aberration, image field curvature and distortion curves for example 5;
FIG. 12 is the MTF curve of example 5;
in the figure: 10-first prism, 20-first lens, 30-positive lens, 40-negative lens, 50-third lens, 60-fourth lens, 90-optical fiber bundle, 100-lens barrel, 110-protective pad, 120-first space ring, 130-second space ring, 140-third space ring, 150-fourth space ring, K1-light inlet, K2-observation hole, S11-first object end surface, S12-first reflection surface, S13-first image end surface, S21-second object end surface, S22-second image end surface, S31-third object end surface, S32-third image end surface, S41-fourth object end surface, S42-fourth image end surface, S51-fifth object end surface, S52-fifth image end surface, S61-sixth object end surface, S62-sixth image end surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, the present invention provides a high resolution side imaging micro endoscopic objective lens set, comprising a first prism 10, a first lens 20, second lenses 30 and 40, a third lens 50, a fourth lens 60 and an imaging surface 70, which are sequentially arranged from the object side, wherein each lens of the micro objective lens set has parameters adapted to enable the working distance to be 40-80 μm at a wavelength of 488nm and the field of view to be 290 μm when the clear aperture of the micro objective lens set is less than 0.8 mm. The light emitted from the object plane sequentially passes through the first prism 10, the first lens 20, the second lenses 30 and 40, the third lens 50, and the fourth lens 60, and then is imaged on the imaging plane 70; the first prism 10 is a 45 ° right-angle prism for turning the optical path to enable the system to image a lateral object, the first prism 10 includes a first object end surface S11, a first reflecting surface S12 and a first image end surface S13; the first lens 20 is a plano-convex lens, which facilitates direct contact with the prism at the front end. The first lens 20 includes a second object end surface S21 and a second image end surface S22. The second end surface S21 is a flat surface that is convenient to closely coincide with the first image end surface S13 of the first prism 10; the second lens is a double-cemented lens formed by combining the lens 30 and the lens 40, and aberration is corrected by matching a glass material with high refractive index and low dispersion coefficient and a glass material with high refractive index and high dispersion coefficient respectively; the lens 30 includes a third object end surface S31 and a third image end surface S32; the lens 40 includes a fourth object end surface S41 and a fourth image end surface S42, the third image end surface S32 closely coincides with the fourth object end surface S41; the third lens 50 is a thick meniscus lens, which can be used to correct curvature of field, and is a high refractive index glass material. The third lens 50 includes a fifth object end surface S51 and a fifth image end surface S52; the fourth lens 60 is a convex flat lens, is convenient for coupling with the rear end optical fiber bundle, is used for compensating residual aberration, and is made of a glass material with a high refractive index. The fourth lens 60 includes a sixth object end surface S61 and a sixth image end surface S62; the second object end surface S21 is a flat surface facilitating direct contact with the first image end surface S13 of the first prism. The sixth image end surface S62 is planar to facilitate coupling and mating with the optical fiber bundle. The second image end surface S22, the third object end surface S31, the third image end surface S32, the fourth image end surface S42, the fifth object end surface S51 and the sixth object end surface S61 are convex surfaces; the fourth object end surface S41 and the fifth image end surface S52 are concave; namely, the high-resolution side imaging micro endoscopic objective group meets the following conditions:
(1)R21S>0，R22S<0；
(2)R31S>0，R32S<0；
(3)R42S<R41S<0；
(4)R51S>R52S>0；
(5)R62S>R61S>0；
wherein R21S is a radius of curvature of the second end surface S21 of the first lens; R22S is a radius of curvature of the second image end surface S22 of the first lens; R31S is a radius of curvature of the third object end surface S31 of the second lens; R32S is a radius of curvature of the third image end surface S32 of the second lens; R41S is a radius of curvature of the fourth object end surface S41 of the second lens; R42S is a radius of curvature of the fourth image end surface S42 of the second lens; R51S is a radius of curvature of a fifth object end surface S51 of the third lens; R52S is a radius of curvature of the fifth image end surface S52 of the third lens; R61S is a radius of curvature of a sixth object end surface S61 of the fourth lens; R62S is a radius of curvature of the sixth image end surface S62 of the fourth lens.
The micro endoscopic microscope objective group for high-resolution lateral imaging has machinability, and the curvature radius R of all lenses, the middle thickness CT of the lenses, the edge thickness ET of the lenses and the air gap thickness AT satisfy the following conditional expressions:
(1)R>0.5mm
(2)CT>0.4mm
(3)ET>0.4mm
(4)AT>0.2mm
a specific example of a high resolution lateral imaging micro endoscopic objective lens set with an outer diameter of less than 1.2mm is as follows:
example 1
As shown in fig. 1, the lens structure of the objective lens for an endoscope according to example 1 is a micro-endoscope microscope objective lens assembly for high-resolution side imaging having an outer diameter of 0.8mm and a clear aperture of less than 0.6mm, and specific lens data of each lens are shown in table 1, specification thereof is shown in table 2, and aberrations thereof are shown in fig. 3 to 4:
TABLE 1
Figure BDA0002922893260000081
TABLE 2
TTL/mm 5.4
Object distance/mum 60
Object space field/mum 296
F number 5.05
In the micro endoscopic objective lens assembly for high resolution side imaging according to example 1, since the outer diameter of the lens is 0.8mm, the clear aperture is less than 0.6mm, and the thickness of the conventional housing is 0.1mm, the diameter of the probe with the housing formed by the micro endoscopic objective lens assembly is less than or equal to 1 mm.
Example 2
The micro endoscopic objective lens assembly for high resolution side imaging provided in example 2 has an outer diameter of 0.9mm and a clear aperture of less than 0.7mm, and the specific lens data of each lens is shown in table 3, and the specification is shown in table 4, and the aberration diagrams are shown in fig. 5 to 6:
TABLE 3
Figure BDA0002922893260000091
TABLE 4
TTL/mm 5.45
Object distance/mum 60
Object space field/mum 304
F number 4.09
In example 2, the micro-endoscope objective lens group for high-resolution lateral imaging has an outer diameter of 0.9mm and a clear aperture of less than 0.7mm, whereas the conventional case has a thickness of 0.1mm, so that the diameter of the probe with the case formed by the micro-endoscope objective lens group is less than or equal to 1.1 mm.
Example 3
The micro endoscopic objective lens group for high resolution side imaging provided in example 3 has an outer diameter of 1mm, a clear aperture of less than 0.8mm, specific lens data of each lens are shown in table 5, specifications are shown in table 6, and various aberrations are shown in fig. 7 to 8:
TABLE 5
Figure BDA0002922893260000092
Figure BDA0002922893260000101
TABLE 6
TTL/mm 5.77
Object distance/mum 60
Object space field/mum 317
F number 3.68
In example 3, the micro-endoscope objective lens group for high-resolution lateral imaging has an outer diameter of 1mm, a clear aperture of less than 0.8mm, and a conventional housing thickness of 0.1mm, so that the diameter of the probe with the housing formed by the micro-endoscope objective lens group is less than 1.2 mm.
Example 4
The objective distance of the high-resolution side-imaging micro endoscopic objective lens set provided in example 4 is 40 μm, specific lens data of each lens is shown in table 7, specification is shown in table 8, and aberrations are shown in fig. 9 to 10:
TABLE 7
Figure BDA0002922893260000102
TABLE 8
TTL/mm 5.22
Clear aperture/mm <0.6mm
Object space field/mum 296
F number 5.11
In example 4, the high resolution side imaging micro-endoscope objective lens set has a clear aperture of less than 0.6mm, and the thickness of the conventional housing is 0.1mm, so that the diameter of the probe with the housing formed by the micro-endoscope objective lens set is less than or equal to 1 mm.
Example 5
The objective distance of the high-resolution side-imaging micro endoscopic objective lens set provided in example 5 is 80 μm, specific lens data of each lens is shown in table 9, specification is shown in table 10, and aberrations are shown in fig. 11 to 12:
TABLE 9
Figure BDA0002922893260000111
Watch 10
TTL/mm 5.2
Clear aperture/mm <0.6mm
Object space field/mum 296
F number 5.12
In example 5, the high resolution side imaging micro-endoscope objective lens set has a clear aperture of less than 0.6mm, and the thickness of the conventional housing is 0.1mm, so that the diameter of the probe with the housing made of the micro-endoscope objective lens set is less than or equal to 1 mm.
The spherical aberration curves, astigmatism curves, distortion curves and MTF curves of all the light-passing apertures of the high-resolution side-imaging micro endoscopic objective lens group of the embodiments 1 to 3 are approximate; the spherical aberration curve, astigmatism curve, distortion curve and MTF curve of the high-resolution side-imaging micro endoscopic objective lens set for the different object distances described in examples 1, 4 and 5 are similar, so only example 1 is selected for detailed description. The method comprises the following specific steps:
fig. 3 is a diagram showing aberration diagrams of spherical aberration, astigmatism, and distortion of the high-resolution side-imaging micro-endoscope objective lens of example 1 in order from the left. In the spherical aberration graph, a spherical aberration curve is shown by a solid line. In the astigmatism graphs, aberrations in the tangential plane are shown by solid lines, and aberrations in the sagittal plane are shown by broken lines. In the distortion graph, distortion aberration of the system is shown by a solid line.
The same applies to the following examples as long as the signs, meanings, and description methods of the respective data described in the above description of example 1 are not particularly described, and therefore, the repetitive description thereof will be omitted below.
FIG. 4 is a graph of MTF curves corresponding to the central field, 0.15mm (0.5 field), 0.2mm (0.707 field), and 0.3mm (peripheral field) at frequencies of 0-150cy/mm for the central field and the sagittal plane at four different positions, and comparing the MTF curves at the diffraction limit. The 8 MTF curves have a certain difference with the MTF curve under the diffraction limit condition. The diameter of the fiber core of the optical fiber bundle is about 3.5 μm, namely the pixel size is 3.5 μm, and the corresponding cut-off frequency is 143 lp/mm. As shown, at a frequency of 150cy/mm, the full-field MTF >0.43 meets the design criteria of greater than 0.4. The design resolution can be considered to be satisfactory.
Conditional expressions (1) to (5) of a high-resolution side-imaging micro-endoscopic objective lens group according to examples 1 to 5 and their respective parameter values are shown in table 11. The values shown in Table 11 are based on a wavelength of 488 nm:
TABLE 11
Numbering Parameter(s) Example 1 Example 2 Example 3 Example 4 Example 5
1 Lst 2.00 2.03 2.41 1.95 1.92
2 La 1.74 1.75 1.91 1.69 1.65
3 Lst/La 1.15 1.16 1.26 1.15 1.16
4 fdou 1.32 1.38 2.01 1.30 1.32
5 f 0.86 1.07 1.47 1.35 1.32
6 fdou/f 1.54 1.29 1.36 0.96 1.00
7 La/f 2.02 1.64 1.30 1.25 1.25
8 fb 0.31 0.30 0.30 0.30 0.30
9 fb/f 0.36 0.28 0.20 0.22 0.23
10 Las 2.72 2.75 3.13 2.67 2.64
11 L0 5.10 5.15 5.47 4.92 4.90
12 Las/L0 0.53 0.53 0.57 0.54 0.54
From the above data, it can be seen that the micro endoscopic objective lens assembly for high resolution side imaging according to embodiments 1-5 is an optical system having a 1-prism-plus-4-lens (including a cemented doublet) structure, and the objective lens assembly has an outer diameter smaller than 1mm and is micro-sized. The 1 prism can perform 90-degree turning on the light path, and is formed into lateral imaging. The resolution of an imaging surface of the objective lens group reaches 150cy/mm, the requirement of a fiber bundle can be met, the diameter of a fiber core of the fiber bundle is about 3.5 mu m, and the objective lens group has 2 times of magnification, can realize object space resolution less than 2 mu m, and is high in resolution.
Fig. 2 is a schematic overall configuration diagram of the endoscope. The endoscope probe shown in fig. 2 mainly includes a lens barrel 100, a protective spacer 110, a plurality of spacers included in the lens barrel, including a first spacer 120 located between the lens 20 and the lens 30, a second spacer 130 located between the lens 40 and the lens 50, a third spacer 140 located between the lens 50 and the lens 60, and a fourth spacer 150 located between the lens 60 and the optical fiber bundle 90, and the optical fiber bundle 90 for imaging.
The lens barrel 100 is characterized in that it has an opening K1 to facilitate light rays from the side direction to enter the lens; the side wall of the device is provided with two small holes K2, and the two small holes are opposite to each other and have the function of facilitating the assembly and positioning.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A miniature endoscopic microscope objective set for high-resolution lateral imaging is characterized in that: the lens system comprises a first prism, a first lens, a second lens, an opening diaphragm, a third lens, a fourth lens and an imaging surface which are arranged in sequence from the object side; the first prism is a 45-degree right-angle prism and is provided with a first object end surface, a first reflecting surface and a first image end surface; the first lens is a plano-convex lens and is provided with a second object end surface and a second image end surface; the second lens is a double-cemented lens formed by combining a positive lens and a negative lens, the first lens is provided with a third object end surface and a third image end surface, the second lens is provided with a fourth object end surface and a fourth image end surface, and the third image end surface and the fourth object end surface are closely superposed; the third lens is a meniscus lens and is provided with a fifth object end surface and a fifth image end surface; the fourth lens is a convex flat lens and is provided with a sixth object end surface and a sixth image end surface; the second and sixth image end surfaces are flat surfaces, the second, third, fourth, fifth and sixth object end surfaces are convex surfaces, the fourth and fifth object end surfaces are concave surfaces, the clear aperture of the high-resolution side-imaging micro-endoscope objective lens group is less than 0.8mm, and the high-resolution side-imaging micro-endoscope objective lens group satisfies the following relations:
0.9<fdou/f<1.6；
0.5<Las/L0<0.6；
wherein f isdouIs the focal length of the second lens, f is the effective focal length of the high-resolution laterally-imaged micro endoscopic objective lens group, L0And Las is the distance along the optical axis from the first object end surface of the first prism to the imaging surface of the micro endoscopic microscope set for high-resolution side imaging.
2. The micro endoscopic objective lens assembly for high resolution lateral imaging according to claim 1, wherein: the prism comprises a first prism, a second prism, a third lens, a fourth lens and a fourth lens, wherein the first prism is made of medium-refractive-index high-hardness glass, the first lens is made of low-refractive-index glass, the second lens is made of a combination of high-refractive-index low-dispersion-coefficient glass and high-refractive-index high-dispersion-coefficient glass, the third lens is made of high-refractive-index glass, and the fourth lens is made of high-refractive-index glass.
3. The micro endoscopic objective lens assembly for high resolution lateral imaging according to claim 1, wherein: the first prism, the first lens, the second lens, the third lens and the fourth lens satisfy the following conditions: R21S >0, R22S < 0; R31S >0, R32S < 0; R42S < R41S < 0; R51S > R52S > 0; R62S > R61S > 0; wherein R21S is the radius of curvature of the second end surface of the first lens; R22S is the radius of curvature of the second image end surface of the first lens; R31S is the radius of curvature of the third object end surface of the second lens; R32S is the radius of curvature of the third image end surface of the second lens; R41S is a radius of curvature of a fourth object end surface of the second lens; R42S is a radius of curvature of a fourth image end surface of the second lens; R51S is a radius of curvature of a fifth object end surface of the third lens; R52S is a radius of curvature of a fifth image end surface of the third lens; R61S is a radius of curvature of a sixth object end surface of the fourth lens; R62S is a radius of curvature of a sixth image end surface of the fourth lens.
4. The micro endoscopic objective lens assembly for high resolution lateral imaging according to claim 1, wherein: the high-resolution side-imaging micro endoscopic objective lens group meets the following relation:
1.1<Lst/La<1.3；
wherein Lst is an optical axial distance from the second object end surface of the first lens to the aperture stop, and La is an optical axial distance from the second object end surface of the first lens to the fourth image end surface of the second lens.
5. The micro endoscopic objective lens assembly for high resolution lateral imaging according to claim 1, wherein: the high-resolution side-imaging micro endoscopic objective lens group meets the following relation:
1.2<La/f<2.1；
la is a distance on an optical axis from the second end surface of the first lens to the fourth image end surface of the second lens, and f is an effective focal length of the micro endoscopic objective lens group for high-resolution lateral imaging.
6. The micro endoscopic objective lens assembly for high resolution lateral imaging according to claim 1, wherein: the high-resolution side-imaging micro endoscopic objective lens group meets the following relation:
0.2<fb/f<0.4；
wherein f isbThe distance from the vertex of the sixth image end surface of the fourth lens to the focus of the high-resolution side imaging micro endoscopic objective group, and f is the effective focal length of the high-resolution side imaging micro endoscopic objective group.
7. A probe, characterized by: the micro endoscopic objective lens group comprises a lens cone and a protective gasket, wherein a high-resolution lateral imaging micro endoscopic objective lens group is arranged in the lens cone, a light inlet is formed in the side face of the front end of the lens cone, the light inlet is positioned on the surface of the first object end of a first prism, and the protective gasket is arranged at the front end of the lens cone.
8. A probe as claimed in claim 7, wherein: the lens barrel is internally provided with a plurality of space rings and an optical fiber bundle for imaging, the optical fiber bundle is positioned at the rear end of the fourth lens, and the space rings comprise a first space ring positioned between the first lens and the second lens, a second space ring positioned between the second lens and the third lens, a third space ring positioned between the third lens and the fourth lens, and a fourth space ring positioned between the fourth lens and the optical fiber bundle.
9. A probe as claimed in claim 7, wherein: and the side wall of the lens barrel is provided with an observation hole which is convenient for determining the position of the end face of the optical fiber during assembly.
10. A probe as claimed in claim 7, wherein: the number of the observation holes is 2, and the two observation holes are arranged at opposite positions on the side wall of the lens cone.
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