CN111929877B - A medical endoscope optical zoom 4K adapter - Google Patents
A medical endoscope optical zoom 4K adapter Download PDFInfo
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- CN111929877B CN111929877B CN202010938111.2A CN202010938111A CN111929877B CN 111929877 B CN111929877 B CN 111929877B CN 202010938111 A CN202010938111 A CN 202010938111A CN 111929877 B CN111929877 B CN 111929877B
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- lens
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- positive lens
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- 230000003287 optical effect Effects 0.000 title claims abstract description 32
- 239000011521 glass Substances 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 238000003384 imaging method Methods 0.000 abstract description 6
- 238000005457 optimization Methods 0.000 abstract description 5
- 230000004075 alteration Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 210000001747 pupil Anatomy 0.000 abstract description 3
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- 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
- A61B1/00188—Optical arrangements with focusing or zooming features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Biophysics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
本发明为一种医用内窥镜光学变焦4K适配器，它包括前窗保护玻璃和芯片之间的若干个沿光轴排布的透镜。所述透镜从前窗保护玻璃到芯片之间的若干个沿光轴排布顺序是第一负透镜、第一正透镜、第一三胶合透镜、第二正透镜、第二三胶合透镜。第一三胶合透镜为变焦组，第一三胶合透镜前后移动实现变焦效果。本发明提供一款焦距从16mm到32mm的变焦效果，入瞳直径4mm，使用4K分辨率1/2.5英寸芯片，畸变小于0.3％的医用内窥镜光学变焦适配器。此适配器是一款结构简单，成本控制与优化后的成像物镜。本发明是基于光学成像原理，使用光学设计软件对成像物镜反复地进行结构达到像差的优化设计。
The present invention is a 4K optical zoom adapter for medical endoscopes, which includes a plurality of lenses arranged along the optical axis between the front window protective glass and the chip. The lenses are arranged along the optical axis in the order of a first negative lens, a first positive lens, a first triplet lens, a second positive lens, and a second triplet lens from the front window protective glass to the chip. The first triplet lens is a zoom group, and the first triplet lens moves back and forth to achieve a zoom effect. The present invention provides a medical endoscope optical zoom adapter with a zoom effect of a focal length from 16mm to 32mm, an entrance pupil diameter of 4mm, a 4K resolution 1/2.5-inch chip, and a distortion of less than 0.3%. This adapter is an imaging objective lens with a simple structure, cost control and optimization. The present invention is based on the principle of optical imaging, and uses optical design software to repeatedly perform structural optimization design on the imaging objective lens to achieve aberration optimization.
Description
Technical Field
The invention belongs to a zoom objective optical system, and particularly relates to an adapter applied to a medical endoscope, which is applicable to a visible light source and an infrared light source at the same time.
Background
The endoscope adapter is a switching system between the endoscope ocular and the imaging chip, and is mainly applied to modern medical minimally invasive surgery. The ultra-high definition endoscope adapter can present better medical images and provide higher medical diagnosis and treatment services. An adapter with ultra-high definition image quality and zoom is difficult to realize.
Currently, an aspherical lens is commonly used in an objective optical system with higher pixels, and the requirements on definition and TV distortion are relatively easy to meet. The invention uses the glass aspheric lens to design the adapter, thereby meeting the requirements of higher definition and TV distortion of the aspheric surface.
Disclosure of Invention
The invention aims to design an optical zoom objective lens by using a glass aspheric lens, so as to meet the requirements of higher definition and TV distortion of an aspheric surface. And a reasonable lens structure is used, so that higher definition and zooming effects are achieved.
The invention adopts a structure that the medical endoscope optical zoom 4K adapter comprises a lens body, wherein a plurality of lenses from front window protective glass to a chip are sequentially arranged along an optical axis, namely a first negative lens, a first positive lens, a first three-cemented lens, a second positive lens and a second three-cemented lens, wherein the first three-cemented lens is a zoom group.
Preferably, the lens includes a stop surface interposed between the first cemented lens and the second positive lens.
Further, the chip display surface is perpendicular to the optical axis, and the center of the chip is on the optical axis.
Further, the focal length of the first positive lens is between 20mm and 40mm, the focal length of the first three-cemented lens is between 10mm and 30mm, the focal length of the second positive lens is between 30mm and 60mm, and the focal length of the second three-cemented lens is between-50 mm and-25 mm.
Further, the refractive index of the first negative lens is between 1.50 and 1.70, the refractive index of the first positive lens is between 1.80 and 1.95, the refractive index of the lens close to the first positive lens is between 1.80 and 1.95, the refractive index of the middle positive lens is between 1.45 and 1.60, the refractive index of the negative lens close to the second positive lens is between 1.75 and 1.85, the refractive index of the second positive lens is between 1.45 and 1.60, the refractive index of the positive lens close to the second positive lens is between 1.50 and 1.65, the refractive index of the middle lens is between 1.85 and 2.00, and the refractive index of the negative lens close to the chip is between 1.65 and 1.75.
Further, the first negative lens is a lens with at least one surface being aspheric.
The invention is realized by taking a diaphragm as a boundary, a negative lens is arranged in front, a positive lens is arranged in back, and a reverse distance type objective lens is arranged in front, wherein the front lens comprises a fixed negative focal lens group and a zooming positive focal lens group, an optical objective lens with a similar structure is selected as an initial structure according to the structure, the size of a chip is changed, and the design of an endoscope adapter with excellent image quality is finally achieved by changing and increasing or decreasing glass materials, focal length zoom and an optimal design of aberration control.
The invention has the beneficial effects that the invention provides the medical endoscope optical zoom adapter with the focal length from 16mm to 32mm, the entrance pupil diameter of 4mm and the distortion of less than 0.3 percent by using a 4K resolution 1/2.5 inch chip. The adapter is an imaging objective lens with simple structure and cost control and optimization. The invention is based on the optical imaging principle, and the imaging objective lens is repeatedly subjected to structural optimization design by using optical design software so as to achieve aberration.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
Fig. 2 is a MTF graph of the present invention.
Detailed Description
The specific embodiments of the present invention will be further described with reference to the accompanying drawings.
The invention adopts a structure that the optical zoom 4K adapter of the medical endoscope comprises a lens body, wherein a plurality of lenses from a front window protection glass 7 to a chip 6 are sequentially arranged along an optical axis, namely a first negative lens 1, a first positive lens 2, a first third cemented lens 3, a second positive lens 4 and a second third cemented lens 5, wherein the first third cemented lens is a zoom group. The lens further comprises a diaphragm surface 8 arranged between the first third cemented lens and the second positive lens, the lens comprises a diaphragm surface arranged between the first third cemented lens and the second positive lens, the chip display surface is perpendicular to the optical axis, and the center of the chip is on the optical axis. The focal length of the first positive lens is between 20mm and 40mm, the focal length of the first third cemented lens is between 10mm and 30mm, the focal length of the second positive lens is between 30mm and 60mm, and the focal length of the second third cemented lens is between-50 mm and-25 mm. The refractive index of the first negative lens is between 1.50 and 1.70, the refractive index of the first positive lens is between 1.80 and 1.95, the refractive index of the lens close to the first positive lens is between 1.80 and 1.95, the refractive index of the middle positive lens is between 1.45 and 1.60, the refractive index of the negative lens close to the second positive lens is between 1.75 and 1.85, the refractive index of the second positive lens is between 1.45 and 1.60, the refractive index of the positive lens close to the second positive lens is between 1.50 and 1.65, the refractive index of the middle lens is between 1.85 and 2.00, and the refractive index of the negative lens close to the chip is between 1.65 and 1.75. The first negative lens is a lens with at least one surface being an aspheric surface.
The curvature radius, material, thickness and interval between lenses of each lens are modified to optimize aberration.
The following is an example of the coaxial placement of a 1/2.5 inch CMOS chip with an adapter, giving parameters for one embodiment of the optical zoom 4K adapter for a medical endoscope of the present invention:
Aspheric coefficients:
| Surface | Conic | x4 | x6 |
| 3 | 0 | -3.51968E-05 | 5.88438E-08 |
Zoom data:
| Focal length | 16mm | 32mm |
| Angle of view | 25 Degrees | 12.5 Degree |
| F number | 4 | 8 |
| D6 | 12.44 | 0.89 |
| D10 | 0.20 | 11.75 |
| D17 | 11.92 | 15.08 |
Finally, the zooming effect of the focal length from 16mm to 32mm is obtained, the diameter of an entrance pupil is 4mm, and a 4K resolution 1/2.5 inch chip is used, so that the distortion is less than 0.3 percent of the medical endoscope optical zooming adapter.
The MTF curves for each field of view at 309lp/mm in the graph are compact to a bundle greater than 0.11, indicating that the lens imaging frames are clear and uniform, as shown in FIG. 2. The pixel of a 3840×2160 1/2.5 inch chip is 1.62 microns, corresponding to a quinis line pair of 309lp/mm, at which MTF values >0.11 meet the resolution requirements of the chip.
Claims (5)
1. The medical endoscope optical zoom 4K adapter comprises a lens body and is characterized in that the lens body sequentially comprises front window protective glass (7), a first negative lens (1), a first positive lens (2), a first three-cemented lens (3), a second positive lens (4), a second three-cemented lens (5) and a chip (6) along the optical axis direction, wherein the first three-cemented lens is a zoom group, a part with optical refractive power in the lens body is only the nine lenses, the focal length of the first three-cemented lens is between 10mm and 30mm, the focal length of the second three-cemented lens is between-50 mm and-25 mm, and the first negative lens is at least one aspheric lens.
2. The medical endoscope optical zoom 4K adapter according to claim 1, wherein the lens body further comprises a stop surface (8) placed between the second positive lens (4) and the second third cemented lens (5).
3. The optical zoom 4K adapter of medical endoscope of claim 1, wherein the chip display surface is perpendicular to the optical axis and the chip center is on the optical axis.
4. The medical-endoscope optical zoom 4K adapter of claim 1, wherein the first positive lens has a focal length between 20mm and 40mm and the second positive lens has a focal length between 30mm and 60 mm.
5. The medical endoscope optical zoom 4K adapter according to claim 1, wherein the refractive index of the first negative lens is between 1.50 and 1.70, the refractive index of the first positive lens is between 1.80 and 1.95, the refractive index of the lens close to the first positive lens is between 1.80 and 1.95, the refractive index of the intermediate positive lens is between 1.45 and 1.60, the refractive index of the negative lens close to the second positive lens is between 1.75 and 1.85, the refractive index of the positive lens close to the second positive lens is between 1.45 and 1.60, the refractive index of the intermediate lens is between 1.85 and 2.00, and the refractive index of the negative lens close to the chip is between 1.65 and 1.75.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010938111.2A CN111929877B (en) | 2020-09-09 | 2020-09-09 | A medical endoscope optical zoom 4K adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010938111.2A CN111929877B (en) | 2020-09-09 | 2020-09-09 | A medical endoscope optical zoom 4K adapter |
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| Publication Number | Publication Date |
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| CN111929877A CN111929877A (en) | 2020-11-13 |
| CN111929877B true CN111929877B (en) | 2025-02-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675409B (en) * | 2022-03-03 | 2023-02-03 | 浙江大学 | 4K zooming coupler for endoscope |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212341586U (en) * | 2020-09-09 | 2021-01-12 | 杭州有人光电技术有限公司 | Optical zoom 4K adapter of medical endoscope |
| JP2023172781A (en) * | 2022-05-24 | 2023-12-06 | ソニーグループ株式会社 | Image formation optical system, and imaging device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159908A (en) * | 1995-12-13 | 1997-06-20 | Olympus Optical Co Ltd | Combined lens |
| JP5035867B2 (en) * | 2005-12-01 | 2012-09-26 | 富士フイルム株式会社 | Endoscope objective lens |
| JP5148403B2 (en) * | 2008-07-28 | 2013-02-20 | オリンパスメディカルシステムズ株式会社 | Endoscope objective optical system |
| WO2013069265A1 (en) * | 2011-11-09 | 2013-05-16 | 富士フイルム株式会社 | Object lens for endoscope, and endoscope |
| JP5767423B1 (en) * | 2013-08-22 | 2015-08-19 | オリンパス株式会社 | Magnifying endoscope optical system |
| WO2017145264A1 (en) * | 2016-02-23 | 2017-08-31 | Hoya株式会社 | Variable magnification optical system for endoscope and endscope |
| DE112017004856T5 (en) * | 2016-09-28 | 2019-06-13 | Olympus Corporation | Endoscope objective optical system |
| CN107544126B (en) * | 2017-09-06 | 2023-01-06 | 安徽仁和光电科技有限公司 | Low-F-number full-high-definition projection lens |
| WO2020174561A1 (en) * | 2019-02-26 | 2020-09-03 | オリンパス株式会社 | Endoscope objective optical system |
| CN110873950A (en) * | 2019-11-29 | 2020-03-10 | 浙江大学 | Endoscope objective lens zoom optical system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212341586U (en) * | 2020-09-09 | 2021-01-12 | 杭州有人光电技术有限公司 | Optical zoom 4K adapter of medical endoscope |
| JP2023172781A (en) * | 2022-05-24 | 2023-12-06 | ソニーグループ株式会社 | Image formation optical system, and imaging device |
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