CN114740603A - Aspheric optical system for abdominal cavity endoscope - Google Patents

Aspheric optical system for abdominal cavity endoscope Download PDF

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Publication number
CN114740603A
CN114740603A CN202210434935.5A CN202210434935A CN114740603A CN 114740603 A CN114740603 A CN 114740603A CN 202210434935 A CN202210434935 A CN 202210434935A CN 114740603 A CN114740603 A CN 114740603A
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China
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lens
objective lens
eyepiece
iii
curvature radius
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Inventor
王里昂
陈冲
李先伟
王长丽
林聪�
褚义彬
党铭杨
高索丹
李雪梅
张雷
吕晓朦
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Shenyang Shenda Endoscope Co ltd
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Shenyang Shenda Endoscope Co ltd
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Priority to CN202210434935.5A priority Critical patent/CN114740603A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • 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
    • A61B1/00163—Optical arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • 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
    • A61B1/313—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 for introducing through surgical openings, e.g. laparoscopes
    • A61B1/3132—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 for introducing through surgical openings, e.g. laparoscopes for laparoscopy
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2415—Stereoscopic endoscopes

Abstract

An aspheric optical system for an abdominal cavity endoscope belongs to the technical field of medical instruments, and comprises an objective system, an image transfer system and an ocular system. The objective system images through 4 aspheric lenses arranged in sequence at intervals, the image transfer system composed of 3 groups of double-cemented lenses transfers images, and finally the images are imaged on human eyes or a CCD (charge coupled device) through an eyepiece system composed of three lenses, the maximum distortion of the whole optical system is only-2%, so that almost no difference of edge imaging and central imaging of a visual field is ensured, and meanwhile, the optical imaging quality is excellent and is close to a diffraction limit value. The rear surface of the objective lens I, the rear surface of the objective lens II, the front surface of the objective lens III and the front surface of the objective lens IV are all even aspheric surfaces, a 4-surface aspheric surface structure is adopted, the design theoretical value can be displayed to a great extent, the high-definition identification capability is realized, and the best matching is realized with the existing high-definition 4k camera shooting technology.

Description

Aspheric optical system for abdominal cavity endoscope
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to an aspheric optical system for an abdominal cavity endoscope.
Background
With the rapid development of medical technology, the technology of performing examinations using endoscopes or participating in minimally invasive surgery has been gradually improved. The endoscope is a detection instrument integrating optics, electronics and software, enters a lesion position to be checked through a human body duct, and performs real-time dynamic imaging monitoring on the lesion condition.
The prior endoscope in China mostly adopts a spherical optical system, the imaging quality is general, the aberration is large, after sinusoidal intensity distribution functions with various frequencies are imaged by the optical system, the numerical value is low, the definition cannot be ensured to the maximum extent, and the visual fatigue can be caused to doctors.
There are also endoscope adapter optical systems using 1-plane or 2-plane aspheric surfaces, such as an inner focusing disclosed in CN112099212A, a small-sized endoscope optical system disclosed in CN108873311A, and a small-caliber optical system for endoscope disclosed in CN207473186U, which still have poor image resolution, and do not improve the problems of large distortion, large aberration, etc.
Disclosure of Invention
The endoscope optical system aims at the problems that the imaging quality of the endoscope optical system in the prior art is general, the aberration is large, after sinusoidal intensity distribution functions with various frequencies are imaged by the optical system, the numerical value is low, the distortion is large, the aberration is large, the definition cannot be guaranteed to the greatest extent, the visual fatigue can be caused to doctors, and the like. The invention provides an aspheric optical system for an abdominal cavity endoscope, wherein a 4-surface aspheric optical system is adopted at the end of a design objective, so that the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is high, and high-quality optical characteristics and high-definition image effects can be obtained. The specific technical scheme is as follows:
an aspheric optical system for an abdominal cavity endoscope comprises an objective lens system 1, an image transfer system 2 and an eyepiece lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the eyepiece lens system 3 consists of three lenses; the total degree of the optical system is 390-430 mm, the initial design of the field angle is 80 degrees, the diameter of a lens of the optical system is 3-7 mm, and 43 image planes are provided.
In the above technical solution, the maximum distortion of the optical system is-2%.
In the above technical solution, the objective system 1 includes an objective lens i 1.1, an objective lens ii 1.2, an objective lens iii 1.3, and an objective lens iv 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
In the technical scheme, the center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.5-1.8 mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 0.8-1 mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1-1.5 mm.
In the technical scheme, the front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the rear surface of the objective lens I1.1 is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 1-3; the central thickness of objective lens I1.1 is 1.2 ~ 1.5mm, and the refracting index is 1.8044.
In the technical scheme, the front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is-3.05 mm, and the k value is-2-3; the center thickness of the objective lens II 1.2 is 3.8-4 mm, and the refractive index is 1.794.
In the technical scheme, the front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 0-2; the rear surface of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of the objective lens III 1.3 is 1.4-2 mm, and the refractive index is 1.606.
In the technical scheme, the front surface of the objective lens IV 1.4 is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is-1-3; the rear surface of the objective lens IV 1.4 is a spherical surface, the curvature radius is-6.25 mm, the center thickness of the objective lens IV 1.4 is 2.2-3 mm, and the refractive index is 1.782.
In the technical scheme, the double cemented lenses of the image transfer system 2 take 2 image transfer lenses as a group, the double cemented lenses are double-sided cemented, and the bonding and edging are carried out through photosensitive glue; the spacing distance between each group of double cemented lenses is 4-12 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
in the technical scheme, the lengths of the image rotating lens I2.1 and the image rotating lens II 2.2 are 35-40 mm, and the spacing distance between the image rotating lens I2.1 and the image rotating lens II 2.2 is 3-8 mm.
In the technical scheme, the curvature radius of the front end of the image rotating lens I2.1 is minus 18mm, and the curvature radius of the rear end of the image rotating lens is 18 mm.
In the technical scheme, the eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, eyepiece lens I3.1 is 6 ~ 8mm with eyepiece lens II 3.2's interaxial distance, eyepiece lens II 3.2 is 0.5 ~ 4mm with eyepiece lens III 3.3 interaxial distance.
In the technical scheme, the front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
in the technical scheme, the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
in the technical scheme, the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; the center thickness of the eyepiece lens III 3.3 is 6.5mm, and the refractive index is 1.506.
In the above technical solution, the k value of the even aspheric surface is a conic coefficient.
Compared with the prior art, the aspheric optical system for the abdominal cavity endoscope has the following beneficial effects:
the total degree of the optical system designed by the invention is 390-430 mm, the initial design of the field angle is 80 degrees, the diameter of a lens of the optical system is 3-7 mm, 43 image planes are totally arranged, and the optical system has the advantages of large depth of field and large field range.
The optical system of the invention is composed of an objective lens system, an image transfer system and an ocular lens system. The objective system is imaged by 4 aspheric lenses which are sequentially arranged at intervals, the image transfer system consisting of 3 groups (6) of double-cemented lenses is used for transferring images, and finally the images are imaged on human eyes or a CCD (charge coupled device) by an eyepiece system consisting of three lenses, the maximum distortion of the whole optical system is only-2%, so that almost no difference of edge imaging and central imaging of a viewing field is ensured, meanwhile, the optical imaging quality is excellent and is close to a diffraction limit value.
Thirdly, the back of the objective lens I, the back of the objective lens II, the front of the objective lens III and the front of the objective lens IV are all designed into even aspheric surfaces, 4 even aspheric surfaces are adopted, and 4 aspheric surface structures are adopted, wherein data parameters such as the center distance, the center thickness, the refractive index, the non-curvature radius of each even order, the k value, the curvature radius and the like of the four objective lenses are respectively designed; the 4 aspheric structures combined with the spherical lens can greatly reduce the distortion generated in the light transmission process, and the maximum distortion is only-2%.
The double-cemented lens is double-sided cemented, and the bonding and edging are carried out through the photosensitive adhesive, so that the spherical aberration and the chromatic aberration of the system can be optimized, and the eccentric value of the lens can be effectively ensured by edging after the cementing.
In conclusion, the existing domestic endoscope mostly adopts a spherical optical system, the imaging quality is general, the aberration is large, after sinusoidal intensity distribution functions with various frequencies are imaged by the optical system, the numerical value is low, the definition cannot be ensured to the maximum extent, and the visual fatigue can be caused to doctors. The invention mainly designs an optical system of the abdominal cavity endoscope, an aspheric optical system is adopted at the objective end, and the design of parameters such as the distance between lenses, the curvature radius, the center thickness, the refractive index and the like of a relay system and an ocular system of the optical system is combined, so that the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.
Drawings
FIG. 1 is a schematic structural diagram of an objective lens system of an aspheric optical system for an laparoscope according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an image transfer system of an aspheric optical system for an laparoscope according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an eyepiece system of an aspheric optical system for an laparoscope according to an embodiment of the present invention;
in FIGS. 1-3, 1-objective system, 1.1-objective lens I, 1.2-objective lens II, 1.3-objective lens III, 1.4-objective lens IV; 2-image transfer system, 2.1-image transfer lens I, 2.2-image transfer lens II; 3-ocular system, 3.1-ocular lens I, 3.2-ocular lens II, 3.3-ocular lens III.
FIG. 4 is a diagram showing the diffraction modulation transfer function at all positions of the field of view of an aspherical optical system for an laparoscope according to embodiment 1 of the present invention.
Fig. 5 is a mesh distortion diagram of an aspheric optical system for an laparoscope according to embodiment 1 of the present invention.
Fig. 6 is a simulated image of an aspherical optical system for an laparoscope according to embodiment 1 of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments and figures 1-6, but the invention is not limited to these embodiments.
Example 1
An aspheric optical system for an abdominal cavity endoscope is shown in figures 1-3, and comprises an objective lens system 1, an image transfer system 2 and an ocular lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the ocular lens system 3 consists of three lenses; the total degree of the optical system is 410mm, the field angle is initially designed to be 80 degrees, the lens diameter of the optical system is 6mm, and 43 image planes are provided.
The objective system 1 comprises an objective lens I1.1, an objective lens II 1.2, an objective lens III 1.3 and an objective lens IV 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
The center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.6mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 0.9mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1.2 mm.
The front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the back of the objective lens I1.1 is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 2; the central thickness of the objective lens I1.1 is 1.3mm and the refractive index is 1.8044.
The front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is minus 3.05mm, and the k value is minus 1; the central thickness of the objective lens II 1.2 is 3.9mm and the refractive index is 1.794.
The front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 1; the rear surface of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of the objective lens III 1.3 is 1.7mm and the refractive index is 1.606.
The front surface of the objective lens IV 1.4 is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is-1; the rear surface of the objective lens IV 1.4 is spherical, the curvature radius is minus 6.25mm, the center thickness of the objective lens IV 1.4 is 2.6mm, and the refractive index is 1.782.
The double-cemented lens of the image transfer system 2 takes 2 image transfer lenses as a group, the double-cemented lens is double-sided cemented, and the edge grinding is carried out by bonding through photosensitive glue; the spacing distance between each group of double cemented lenses is 8 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
the length of the relay lens I2.1 and the relay lens II 2.2 is 36mm, and the spacing distance between the relay lens I2.1 and the relay lens II 2.2 is 5.5 mm.
The front end curvature radius of the image rotating lens I2.1 is-18 mm, and the rear end curvature radius is 18 mm.
The eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, and the interaxial distance of eyepiece lens I3.1 and eyepiece lens II 3.2 is 7mm, and the interaxial distance of eyepiece lens II 3.2 and eyepiece lens III 3.3 is 2.2 mm.
The front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; eyepiece lens III 3.3 has a center thickness of 6.5mm and a refractive index of 1.506.
The aspheric optical system of the embodiment has a good application effect, the diffraction modulation transfer functions of all positions of a field of view are shown in fig. 4, the grid distortion is shown in fig. 5, the simulated image is shown in fig. 6, the maximum distortion of the whole optical system is only-2%, the edge imaging and the central imaging of the field of view are almost the same, and meanwhile, the optical imaging quality is excellent and is close to the diffraction limit value. The total number of the 43 image planes is 43, the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.
Example 2
An aspheric optical system for an abdominal cavity endoscope is shown in figures 1-3, and comprises an objective lens system 1, an image transfer system 2 and an ocular lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the ocular lens system 3 consists of three lenses; the total degree of the optical system is 390mm, the field angle is initially designed to be 80 degrees, the lens diameter of the optical system is 3mm, and 43 image planes are provided.
The objective system 1 comprises an objective lens I1.1, an objective lens II 1.2, an objective lens III 1.3 and an objective lens IV 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
The center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.5mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 0.8mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1 mm.
The front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the back of the objective lens I1.1 is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 1; the central thickness of the objective lens I1.1 is 1.2mm and the refractive index is 1.8044.
The front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is-3.05 mm, and the k value is-2; the central thickness of the objective lens II 1.2 is 3.8mm and the refractive index is 1.794.
The front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 1; the rear surface of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of the objective lens III 1.3 is 1.4mm and the refractive index is 1.606.
The front surface of the objective lens IV 1.4 is an even aspheric surface, the curvature radius of the vertex is 10.36mm, and the k value is-1; the rear surface of the objective lens IV 1.4 is a spherical surface, the curvature radius is-6.25 mm, the center thickness of the objective lens IV 1.4 is 2.2mm, and the refractive index is 1.782.
The double-cemented lens of the image transfer system 2 takes 2 image transfer lenses as a group, the double-cemented lens is double-sided cemented, and the bonding and edging are carried out through photosensitive adhesive; the spacing distance between each group of double cemented lenses is 4 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
the length of the image transfer lens I2.1 and the length of the image transfer lens II 2.2 are 35mm, and the spacing distance between the image transfer lens I2.1 and the image transfer lens II 2.2 is 3 mm.
The front end curvature radius of the image rotating lens I2.1 is-18 mm, and the rear end curvature radius is 18 mm.
The eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, and the interaxial distance of eyepiece lens I3.1 and eyepiece lens II 3.2 is 6mm, and the interaxial distance of eyepiece lens II 3.2 and eyepiece lens III 3.3 is 0.5 mm.
The front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; eyepiece lens III 3.3 has a center thickness of 6.5mm and a refractive index of 1.506.
The aspheric optical system has a good application effect, the maximum distortion of the whole optical system is only-2%, the edge imaging and the central imaging of the field of view are almost the same, and meanwhile, the optical imaging quality is excellent and is close to the diffraction limit value. The total number of the 43 image planes is 43, the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.
Example 3
An aspheric optical system for an abdominal cavity endoscope is shown in figures 1-3, and comprises an objective lens system 1, an image transfer system 2 and an ocular lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the ocular lens system 3 consists of three lenses; the total degree of the optical system is 430mm, the field angle is initially designed to be 80 degrees, the lens diameter of the optical system is 7mm, and 43 image planes are provided.
The objective system 1 comprises an objective lens I1.1, an objective lens II 1.2, an objective lens III 1.3 and an objective lens IV 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
The center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.8mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 1mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1.5 mm.
The front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the back of the objective lens I1.1 is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 3; the central thickness of the objective lens I1.1 is 1.5mm and the refractive index is 1.8044.
The front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is-3.05 mm, and the k value is 3; the central thickness of the objective lens II 1.2 is 4mm and the refractive index is 1.794.
The front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 2; the rear surface of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of objective lens III 1.3 was 2mm and the refractive index was 1.606.
The front surface of the objective lens IV 1.4 is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is 3; the rear surface of the objective lens IV 1.4 is a spherical surface, the curvature radius is minus 6.25mm, the center thickness of the objective lens IV 1.4 is 3mm, and the refractive index is 1.782.
The double-cemented lens of the image transfer system 2 takes 2 image transfer lenses as a group, the double-cemented lens is double-sided cemented, and the edge grinding is carried out by bonding through photosensitive glue; the spacing distance between each group of double cemented lenses is 12 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
the lengths of the image transfer lens I2.1 and the image transfer lens II 2.2 are 40mm, and the spacing distance between the image transfer lens I2.1 and the image transfer lens II 2.2 is 8 mm.
The front end curvature radius of the image rotating lens I2.1 is-18 mm, and the rear end curvature radius is 18 mm.
The eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, and eyepiece lens I3.1 is 8mm with the interaxial distance of eyepiece lens II 3.2, and eyepiece lens II 3.2 is 4mm with the interaxial distance of eyepiece lens III 3.3.
The front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; eyepiece lens III 3.3 has a center thickness of 6.5mm and a refractive index of 1.506.
The aspheric optical system has a good application effect, the maximum distortion of the whole optical system is only-2%, almost no difference of edge imaging and central imaging of a visual field is guaranteed, and meanwhile, the optical imaging quality is excellent and is close to a diffraction limit value. The total number of the 43 image planes is 43, the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.
Example 4
An aspheric optical system for an abdominal cavity endoscope is shown in figures 1-3, and comprises an objective lens system 1, an image transfer system 2 and an ocular lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the ocular lens system 3 consists of three lenses; the total degree of the optical system is 400mm, the field angle is initially designed to be 80 degrees, the lens diameter of the optical system is 4mm, and 43 image planes are provided.
The objective system 1 comprises an objective lens I1.1, an objective lens II 1.2, an objective lens III 1.3 and an objective lens IV 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
The center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.6mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 0.9mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1.1 mm.
The front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the back of the objective lens I1.1 is an even aspheric surface, the curvature radius of a vertex is 3.45mm, and the k value is 1.5; the central thickness of the objective lens I1.1 is 1.3mm and the refractive index is 1.8044.
The front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is minus 3.05mm, and the k value is minus 1; the central thickness of the objective lens II 1.2 is 3.8mm and the refractive index is 1.794.
The front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 1; the rear surface of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of the objective lens III 1.3 is 1.5mm and the refractive index is 1.606.
The front surface of the objective lens IV 1.4 is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is-1; the rear surface of the objective lens IV 1.4 is a spherical surface, the curvature radius is minus 6.25mm, the center thickness of the objective lens IV 1.4 is 2.3mm, and the refractive index is 1.782.
The double-cemented lens of the image transfer system 2 takes 2 image transfer lenses as a group, the double-cemented lens is double-sided cemented, and the edge grinding is carried out by bonding through photosensitive glue; the spacing distance between each group of double cemented lenses is 5 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
the length of the relay lens I2.1 and the relay lens II 2.2 is 36mm, and the spacing distance between the relay lens I2.1 and the relay lens II 2.2 is 4 mm.
The front end curvature radius of the image rotating lens I2.1 is-18 mm, and the rear end curvature radius is 18 mm.
The eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, and the interaxial distance of eyepiece lens I3.1 and eyepiece lens II 3.2 is 6.5mm, and the interaxial distance of eyepiece lens II 3.2 and eyepiece lens III 3.3 is 1 mm.
The front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; eyepiece lens III 3.3 has a center thickness of 6.5mm and a refractive index of 1.506.
The aspheric optical system has a good application effect, the maximum distortion of the whole optical system is only-2%, the edge imaging and the central imaging of the field of view are almost the same, and meanwhile, the optical imaging quality is excellent and is close to the diffraction limit value. The total number of the 43 image planes is 43, the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.
Example 5
An aspheric optical system for an abdominal cavity endoscope is shown in figures 1-3, and comprises an objective lens system 1, an image transfer system 2 and an ocular lens system 3, wherein the objective lens system 1 consists of 4 aspheric lenses, the image transfer system 2 consists of 3 groups of double-cemented lenses, and the ocular lens system 3 consists of three lenses; the total degree of the optical system is 420mm, the field angle is initially designed to be 80 degrees, the lens diameter of the optical system is 5mm, and 43 image planes are provided.
The objective system 1 comprises an objective lens I1.1, an objective lens II 1.2, an objective lens III 1.3 and an objective lens IV 1.4; the objective lens I1.1, the objective lens II 1.2, the objective lens III 1.3 and the objective lens IV 1.4 are sequentially arranged in sequence; the back of the objective lens I1.1, the back of the objective lens II 1.2, the front of the objective lens III 1.3 and the front of the objective lens IV 1.4 are all even aspheric surfaces.
The center distance between the objective lens I1.1 and the objective lens II 1.2 is 1.7mm, the center distance between the objective lens II 1.2 and the objective lens III 1.3 is 0.95mm, and the center distance between the objective lens III 1.3 and the objective lens IV 1.4 is 1.4 mm.
The front surface of the objective lens I1.1 is a spherical surface, and the curvature radius is-185.5 mm; the back of the objective lens I1.1 is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 2.5; the central thickness of objective lens I1.1 was 1.4mm and the refractive index was 1.8044.
The front surface of the objective lens II 1.2 is a spherical surface, and the curvature radius is 32.285 mm; the back of the objective lens II 1.2 is an even aspheric surface, the vertex curvature radius is-3.05 mm, and the k value is 2.5; the central thickness of the objective lens II 1.2 is 4mm and the refractive index is 1.794.
The front surface of the objective lens III 1.3 is an even aspheric surface, the vertex curvature radius is-120 mm, and the k value is 1.8; the back of the objective lens III 1.3 is a spherical surface, and the curvature radius is-12.45 mm; the central thickness of the objective lens III 1.3 is 1.9mm and the refractive index is 1.606.
The front surface of the objective lens IV 1.4 is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is 2.5; the rear surface of the objective lens IV 1.4 is a spherical surface, the curvature radius is minus 6.25mm, the center thickness of the objective lens IV 1.4 is 2.8mm, and the refractive index is 1.782.
The double-cemented lens of the image transfer system 2 takes 2 image transfer lenses as a group, the double-cemented lens is double-sided cemented, and the edge grinding is carried out by bonding through photosensitive glue; the spacing distance between each group of double cemented lenses is 10 mm; each group of double cemented lenses comprises an image transfer lens I2.1 and an image transfer lens II 2.2;
the length of the relay lens I2.1 and the relay lens II 2.2 is 39mm, and the spacing distance between the relay lens I2.1 and the relay lens II 2.2 is 7 mm.
The front end curvature radius of the image rotating lens I2.1 is-18 mm, and the rear end curvature radius is 18 mm.
The eyepiece system 3 comprises an eyepiece lens I3.1, an eyepiece lens II 3.2 and an eyepiece lens III 3.3; eyepiece lens I3.1, eyepiece lens II 3.2 and eyepiece lens III 3.3 arrange in proper order from beginning to end, and the interaxial distance of eyepiece lens I3.1 and eyepiece lens II 3.2 is 7.5mm, and the interaxial distance of eyepiece lens II 3.2 and eyepiece lens III 3.3 is 3 mm.
The front surface of the eyepiece lens I3.1 is a plane, the rear surface of the eyepiece lens I3.1 is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I3.1 is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II 3.2 is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II 3.2 is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is 16.5 mm; the rear surface of the eyepiece lens III 3.3 is a spherical surface, and the curvature radius is-18.5 mm; eyepiece lens III 3.3 has a center thickness of 6.5mm and a refractive index of 1.506.
The aspheric optical system has a good application effect, the maximum distortion of the whole optical system is only-2%, the edge imaging and the central imaging of the field of view are almost the same, and meanwhile, the optical imaging quality is excellent and is close to the diffraction limit value. The total number of the 43 image planes is 43, the distortion generated in the light transmission process is greatly reduced, the definition of the whole system is good, and the high-quality optical characteristics and the high-definition image effect are greatly obtained.

Claims (10)

1. An aspheric optical system for an abdominal cavity endoscope is characterized in that the optical system comprises an objective lens system (1), an image transfer system (2) and an ocular lens system (3), wherein the objective lens system (1) consists of 4 aspheric lenses, the image transfer system (2) consists of 3 groups of double-cemented lenses, and the ocular lens system (3) consists of three lenses; the total degree of the optical system is 390-430 mm, the initial design of the field angle is 80 degrees, the diameter of a lens of the optical system is 3-7 mm, and 43 image planes are provided.
2. An aspheric optical system for an laparoscope as claimed in claim 1, characterised in that the objective system (1) comprises an objective lens i (1.1), an objective lens ii (1.2), an objective lens iii (1.3) and an objective lens iv (1.4); the objective lens I (1.1), the objective lens II (1.2), the objective lens III (1.3) and the objective lens IV (1.4) are sequentially arranged in front and back; the back of the objective lens I (1.1), the back of the objective lens II (1.2), the front of the objective lens III (1.3) and the front of the objective lens IV (1.4) are even aspheric surfaces.
3. The aspheric optical system as defined in claim 2, wherein the distance between the centers of the objective lens I (1.1) and the objective lens II (1.2) is 1.5-1.8 mm, the distance between the centers of the objective lens II (1.2) and the objective lens III (1.3) is 0.8-1 mm, and the distance between the centers of the objective lens III (1.3) and the objective lens IV (1.4) is 1-1.5 mm.
4. An aspheric optical system for laparoscope as defined in claim 2 or 3, characterised in that the front face of the objective lens I (1.1) is spherical with a radius of curvature of-185.5 mm; the rear surface of the objective lens I (1.1) is an even aspheric surface, the vertex curvature radius is 3.45mm, and the k value is 1-3; the central thickness of the objective lens I (1.1) is 1.2-1.5 mm, and the refractive index is 1.8044.
5. An aspheric optical system for laparoscope as defined in claim 2 or 3, characterised in that the front face of the objective lens II (1.2) is spherical and has a radius of curvature of 32.285 mm; the back of the objective lens II (1.2) is an even aspheric surface, the vertex curvature radius is-3.05 mm, and the k value is-2-3; the center thickness of the objective lens II (1.2) is 3.8-4 mm, and the refractive index is 1.794.
6. An aspheric optical system as claimed in claim 2 or 3, characterised in that the objective lens III (1.3) is preceded by an even aspheric surface with a vertex radius of curvature of-120 mm and a k value of 0-2; the rear surface of the objective lens III (1.3) is a spherical surface, and the curvature radius is-12.45 mm; the center thickness of the objective lens III (1.3) is 1.4-2 mm, and the refractive index is 1.606.
7. The aspheric optical system for laparoscope as defined in claim 2 or 3, wherein the front surface of the objective lens IV (1.4) is an even aspheric surface, the vertex curvature radius is 10.36mm, and the k value is-1-3; the rear surface of the objective lens IV (1.4) is a spherical surface, the curvature radius is-6.25 mm, the center thickness of the objective lens IV (1.4) is 2.2-3 mm, and the refractive index is 1.782.
8. The aspheric optical system for laparoscope as defined in claim 1, wherein the double cemented lenses of the relay system (2) are composed of 2 relay lenses, the double cemented lenses are cemented on both sides, and are cemented and edged by photosensitive glue; the spacing distance between each group of double cemented lenses is 4-12 mm; each group of double-cemented lens comprises an image transfer lens I (2.1) and an image transfer lens II (2.2), the lengths of the image transfer lens I (2.1) and the image transfer lens II (2.2) are 35-40 mm, and the spacing distance between the image transfer lens I (2.1) and the image transfer lens II (2.2) is 3-8 mm; the front end curvature radius of the image rotating lens I (2.1) is-18 mm, and the rear end curvature radius is 18 mm.
9. An aspheric optical system for a laparoscope as claimed in claim 1, characterised in that the eyepiece system (3) comprises an eyepiece lens i (3.1), an eyepiece lens ii (3.2) and an eyepiece lens iii (3.3); eyepiece lens I (3.1), eyepiece lens II (3.2) and eyepiece lens III (3.3) arrange in proper order from beginning to end, the interaxial distance of eyepiece lens I (3.1) and eyepiece lens II (3.2) is 6 ~ 8mm, the interaxial distance of eyepiece lens II (3.2) and eyepiece lens III (3.3) is 0.5 ~ 4 mm.
10. The aspheric optical system for laparoscope as defined in claim 9,
the front surface of the eyepiece lens I (3.1) is a plane, the rear surface of the eyepiece lens I (3.1) is a spherical surface, the curvature radius is-8.56 mm, the center thickness of the eyepiece lens I (3.1) is 3.5mm, and the refractive index is 1.814;
the front surface of the eyepiece lens II (3.2) is a spherical surface, and the curvature radius is 16.8 mm; the rear surface of the eyepiece lens II (3.2) is a spherical surface, and the curvature radius is-10.2 mm; the center thickness of the eyepiece lens II (3.2) is 4.5mm, and the refractive index is 1.9013;
the front surface of the eyepiece lens III (3.3) is a spherical surface, and the curvature radius is 16.5 mm; the back of the eyepiece lens III (3.3) is a spherical surface, and the curvature radius is-18.5 mm; the center thickness of the eyepiece lens III (3.3) is 6.5mm, and the refractive index is 1.506.
CN202210434935.5A 2022-04-24 2022-04-24 Aspheric optical system for abdominal cavity endoscope Pending CN114740603A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115480376A (en) * 2022-09-22 2022-12-16 浙江天松医疗器械股份有限公司 High-definition super-wide-angle arthroscope imaging system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115480376A (en) * 2022-09-22 2022-12-16 浙江天松医疗器械股份有限公司 High-definition super-wide-angle arthroscope imaging system
CN115480376B (en) * 2022-09-22 2023-09-29 浙江天松医疗器械股份有限公司 High-definition ultra-wide angle arthroscope imaging system

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