CN113031240A - Microscope objective - Google Patents
Microscope objective Download PDFInfo
- Publication number
- CN113031240A CN113031240A CN202110261637.6A CN202110261637A CN113031240A CN 113031240 A CN113031240 A CN 113031240A CN 202110261637 A CN202110261637 A CN 202110261637A CN 113031240 A CN113031240 A CN 113031240A
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- China
- Prior art keywords
- lens
- focal length
- microscope objective
- numerical value
- lens element
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000006185 dispersion Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000011521 glass Substances 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/02—Objectives
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Lenses (AREA)
Abstract
The invention discloses a microscope objective lens, which is characterized in that a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens are arranged, and the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are arranged in order from the object plane along the image plane, and the first focal length, the second focal length, the third focal length, the fourth focal length, the fifth focal length, the sixth focal length, the seventh focal length, the eighth focal length and the total focal length meet specific conditions, and by reasonably distributing the focal lengths, therefore, the working distance of the microscope objective can be increased to reach a long working distance, the tolerance sensitivity of the optical system of the microscope objective is good, the assembly configuration of the optical system can be met, and the microscope objective can be widely applied to the technical field of microscope objectives.
Description
Technical Field
The invention relates to the technical field of microscope objectives, in particular to a microscope objective.
Background
Microscope objectives are one of the most important optical devices constituting microscopes, and with the recent expansion of the application fields of the metallographic microscope in the industrial field, the requirements on the metallographic microscope objectives are higher and higher, for example, the metallographic microscope objectives are required to have longer working distance, higher resolution and the like. However, the conventional microscope objective lens has a limited working distance, and is difficult to obtain a long working distance, so that an infinite conjugate objective lens is usually adopted, and the working distance of the microscope objective lens is increased to a certain extent by a form of an inverse-distance structure.
Disclosure of Invention
To solve the above technical problems, the present invention aims to: a microscope objective lens having good tolerance sensitivity is provided.
The technical scheme adopted by the invention is as follows:
a microscope objective, comprising:
a first lens having a first focal length with a positive numerical value;
a second lens having a second focal length with a positive numerical value;
a third lens having a third focal length with a negative numerical value;
a fourth lens having a fourth focal length with a positive numerical value;
a fifth lens having a fifth focal length with a positive numerical value;
a sixth lens having a sixth focal length with a negative numerical value;
a seventh lens having a seventh focal length with a positive numerical value;
an eighth lens having an eighth focal length with a negative numerical value;
wherein, the firstA lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are arranged in order from an object plane along an image plane direction; the microscope objective lens formed by the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens has an overall focal length;
further, the first lens, the second lens, the fourth lens, and the fifth lens each have an abbe number greater than 60.
Further, the refractive index of the fourth lens, the refractive index of the seventh lens, and the refractive index of the eighth lens are all greater than 1.8.
Further, the third lens and the fourth lens constitute a cemented lens, the sixth lens and the fifth lens constitute a cemented lens, and the seventh lens and the eighth lens constitute a cemented lens.
Further, the microscope objective has a magnification of 10 x, a working distance of 35mm, a numerical aperture of more than 0.3, and a resolution of less than 1 μm.
Further, the microscope objective is made of a low-dispersion material.
Further, in the present invention,
further, in the present invention,
further, in the present invention,
the invention has the beneficial effects that: by arranging a first lens having a first focal length of positive number, a second lens having a second focal length of positive number, a third lens having a third focal length of negative number, a fourth lens having a fourth focal length of positive number, a fifth lens having a fifth focal length of positive number, a sixth lens having a sixth focal length of negative number, a seventh lens having a seventh focal length of positive number, an eighth lens having an eighth focal length of negative number, and arranging the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens in this order from the object plane in the image plane direction, and making specific conditions be satisfied between the first focal length, the second focal length, the third focal length, the fourth focal length, the fifth focal length, the sixth focal length, the seventh focal length, the eighth focal length, and the total focal length, through reasonable distribution of focal power, the working distance of the microscope objective can be increased to reach a long working distance, the tolerance sensitivity of an optical system of the microscope objective is good, and the assembly configuration of the optical system can be met.
Drawings
Fig. 1 is a schematic structural diagram of a microscope objective lens according to the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," and the like in the description and claims of this application and in the drawings are used solely to distinguish one from another and are not used to describe a particular sequence. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention will be further explained and explained with reference to the drawings and the embodiments in the description.
Referring to fig. 1, an embodiment of the present invention provides a microscope objective lens including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. Note that, since the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are glass lenses, the corresponding abbe number is a glass abbe number, and the corresponding refractive index is a refractive index of glass. The microscope objective is an infinite conjugate objective, namely, an object point is observed to be located on an object plane, light emitted by the object point is imaged at infinity after passing through the objective, and then the light can be converged on an image plane of the tube lens through the rear tube objective.
In the embodiment of the present application, the microscope objective lens composed of eight lenses has a total focal length f', and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are sequentially arranged from the object plane along the image plane (not shown), as shown in fig. 1, sequentially arranged from left to right, and the respective lenses are coaxial with the center of the object plane.
In the embodiment of the present application, the microscope objective lens is made of a low dispersion material, optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all made of a low dispersion material, and it is understood that one or more of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may also be made of a low dispersion material. It is to be noted that the present application does not relate to material improvements; alternatively, low dispersion materials include, but are not limited to, H-FK61, H-FK71, FCD 100. The embodiment of the application adopts the dispersing materials such as H-FK61, H-FK71 and FCD100, and can reduce the cost compared with the materials such as fluorite.
Alternatively, the third lens L3 and the fourth lens L4 constitute a cemented lens, the sixth lens L6 and the fifth lens L5 constitute a cemented lens, and the seventh lens L7 and the eighth lens L8 constitute a cemented lens.
In the embodiment of the application, the dispersion coefficient Vd1 of the first lens L1, the dispersion coefficient Vd2 of the second lens L2, the dispersion coefficient Vd4 of the fourth lens L4 and the dispersion coefficient Vd5 of the fifth lens L5 are all larger than 60, and the apochromatic aberration condition can be satisfied by setting the conditions of the dispersion coefficient Vd1 of the first lens L1, the dispersion coefficient Vd2 of the second lens L2, the dispersion coefficient Vd4 of the fourth lens L4 and the dispersion coefficient Vd5 of the fifth lens L5, so that the objective microscope obtains better imaging quality.
In addition, the refractive index Nd4 of the fourth lens L4, the refractive index Nd7 of the seventh lens L7 and the refractive index Nd8 of the eighth lens L8 are all greater than 1.8, and by setting the conditions of the refractive index Nd4 of the fourth lens L4, the refractive index Nd7 of the seventh lens L7 and the refractive index Nd8 of the eighth lens L8, the field curvature condition can be effectively reduced, and the microscope objective lens is also favorable for obtaining better imaging quality.
In the embodiment of the present application, a limiting condition is provided for the focal length of each lens, specifically:
the first lens L1 has a first focal length f 'with a positive value'1It satisfies the condition:
the second lens L2 has a second focal length f 'with a positive value'2It satisfies the condition:
the third lens L3 has a third focal length f 'with a negative numerical value'3It satisfies the condition:
alternatively,
the fourth lens L4 has a fourth focal length f 'with a positive value'4It satisfies the condition:
alternatively,
the fifth lens L5 has a fifth focal length f 'of positive value'5It satisfies the condition:
alternatively,
the sixth lens L6 has a sixth focal length f 'with a negative numerical value'6It satisfies the condition:
alternatively,
the seventh lens L7 has a seventh focal length f 'of positive value'7It satisfies the condition:
alternatively,
the eighth lens L8 has an eighth focal length f 'with a negative numerical value'8It satisfies the condition:
alternatively,
according to the embodiment of the application, the focal lengths of the lenses are limited through the conditions, the focal lengths of the lenses can be reasonably distributed, so that the tolerance of the optical system of the whole microscope objective is good, the assembly configuration of the optical system can be met even when the resolution of the microscope objective is required to be high, and long working distance can be obtained; wherein the working distance refers to the distance from the object plane to the apex of the first (left) surface of the first lens L1. In summary, the focal lengths of the respective lenses are defined by the above conditions, by setting the conditions of the abbe number Vd1 of the first lens L1, the abbe number Vd2 of the second lens L2, the abbe number Vd4 of the fourth lens L4 and the abbe number Vd5 of the fifth lens L5, and setting the conditions of the abbe number Vd1 of the first lens L1, the abbe number Vd2 of the second lens L2, the abbe number Vd4 of the fourth lens L4 and the abbe number Vd5 of the fifth lens L5, the microscope objective lens can effectively reduce the field curvature condition, satisfy the apochromatic aberration condition and make the optical system tolerance of the entire microscope objective lens good by using the cemented lens and pairing of the glass materials of the low-dispersion material, and can satisfy the actual machining and assembly, and has good machining and assembly manufacturability.
It should be noted that the microscope objective lens in the embodiment of the present application has a magnification of 10 ×, a working distance of 35mm, a numerical aperture greater than 0.3, a resolution of less than 1 μm, and a good imaging quality of an optical system, and is low in cost because no special glass material such as fluorite is used.
As shown in table 1, specific parameters of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are shown in a specific embodiment, and it is understood that the parameters of the respective lenses are not limited thereto. Wherein surface number 1 corresponds to the object plane, and numbers 2 to 14 correspond to the surfaces in the respective lenses, specifically, the surface positions of numbers 1 to 14 are shown in fig. 1.
TABLE 1
In addition, in the embodiment of the application, a microscope comprising the microscope objective lens is further provided.
Optionally, the microscope is a metallographic microscope. The metallographic microscope may comprise a tube objective for use with the microscope objective. The focal length of the tube objective includes, but is not limited to, 200 mm.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.
Claims (9)
1. A microscope objective, comprising:
a first lens having a first focal length with a positive numerical value;
a second lens having a second focal length with a positive numerical value;
a third lens having a third focal length with a negative numerical value;
a fourth lens having a fourth focal length with a positive numerical value;
a fifth lens having a fifth focal length with a positive numerical value;
a sixth lens having a sixth focal length with a negative numerical value;
a seventh lens having a seventh focal length with a positive numerical value;
an eighth lens having an eighth focal length with a negative numerical value;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element are arranged in order from an object plane along an image plane; the microscope objective lens formed by the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens has an overall focal length;
2. a microscope objective according to claim 1, characterized in that: the first lens, the second lens, the fourth lens and the fifth lens all have an abbe number greater than 60.
3. A microscope objective according to claim 1, characterized in that: the refractive indexes of the fourth lens, the seventh lens and the eighth lens are all larger than 1.8.
4. A microscope objective according to claim 1, characterized in that: the third lens and the fourth lens constitute a cemented lens, the sixth lens and the fifth lens constitute a cemented lens, and the seventh lens and the eighth lens constitute a cemented lens.
5. A microscope objective according to claim 1, characterized in that: the microscope objective has a magnification of 10 x, a working distance of 35mm, a numerical aperture of more than 0.3 and a resolution of less than 1 μm.
6. A microscope objective according to claim 1, characterized in that: the microscope objective is made of a low-dispersion material.
7. A microscope objective according to claim 1, characterized in that:
8. a microscope objective according to claim 1, characterized in that:
9. a microscope objective according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261637.6A CN113031240A (en) | 2021-03-10 | 2021-03-10 | Microscope objective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261637.6A CN113031240A (en) | 2021-03-10 | 2021-03-10 | Microscope objective |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113031240A true CN113031240A (en) | 2021-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110261637.6A Pending CN113031240A (en) | 2021-03-10 | 2021-03-10 | Microscope objective |
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| CN (1) | CN113031240A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113946035A (en) * | 2021-11-08 | 2022-01-18 | 华中科技大学 | Large-view-field bifocal lens with outer diameter of 2.6mm |
| CN114397751A (en) * | 2021-12-31 | 2022-04-26 | 北方信息控制研究院集团有限公司 | Guidance self-checking division photoelectric imaging detection microscope objective |
| CN115113383A (en) * | 2022-05-30 | 2022-09-27 | 中国人民解放军国防科技大学 | Long-lens-barrel vacuum microscopic imaging lens for observing object to be observed in ultrahigh vacuum |
| CN117270185A (en) * | 2023-11-17 | 2023-12-22 | 长春长光智欧科技有限公司 | Micro-optical system with large numerical aperture and wide spectrum |
| JP7467754B1 (en) | 2023-06-19 | 2024-04-15 | ジョウシュウシ エーエーシー レイテック オプトロニクス カンパニーリミテッド | Microscope Objectives |
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| US20060082896A1 (en) * | 2004-10-18 | 2006-04-20 | Nikon Corporation | Immersion microscope objective lens |
| CN104280868A (en) * | 2014-10-29 | 2015-01-14 | 南京康庄光电仪器有限公司 | Microscope objective lens |
| US20160116724A1 (en) * | 2014-10-24 | 2016-04-28 | Olympus Corporation | Objective for microscope |
| CN106772933A (en) * | 2016-11-21 | 2017-05-31 | 中国科学院上海光学精密机械研究所 | The big visual field microcobjective optical system of wide spectrum |
| CN106772976A (en) * | 2017-02-28 | 2017-05-31 | 浙江大学 | A kind of microcobjective and the wide visual field high-resolution imaging system with the microcobjective |
| CN210666172U (en) * | 2019-10-30 | 2020-06-02 | 深圳市特莱斯光学有限公司 | Large-target-surface compact high-definition lens |
| CN214669847U (en) * | 2021-03-10 | 2021-11-09 | 北京理工大学珠海学院 | Microscope objective |
| CN214669848U (en) * | 2021-03-15 | 2021-11-09 | 北京理工大学珠海学院 | Long working distance microscope objective lens |
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2021
- 2021-03-10 CN CN202110261637.6A patent/CN113031240A/en active Pending
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| US20060082896A1 (en) * | 2004-10-18 | 2006-04-20 | Nikon Corporation | Immersion microscope objective lens |
| US20160116724A1 (en) * | 2014-10-24 | 2016-04-28 | Olympus Corporation | Objective for microscope |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113946035A (en) * | 2021-11-08 | 2022-01-18 | 华中科技大学 | Large-view-field bifocal lens with outer diameter of 2.6mm |
| CN114397751A (en) * | 2021-12-31 | 2022-04-26 | 北方信息控制研究院集团有限公司 | Guidance self-checking division photoelectric imaging detection microscope objective |
| CN115113383A (en) * | 2022-05-30 | 2022-09-27 | 中国人民解放军国防科技大学 | Long-lens-barrel vacuum microscopic imaging lens for observing object to be observed in ultrahigh vacuum |
| CN115113383B (en) * | 2022-05-30 | 2023-11-28 | 中国人民解放军国防科技大学 | Long lens barrel vacuum microscopic imaging lens for observing observed object in ultrahigh vacuum |
| JP7467754B1 (en) | 2023-06-19 | 2024-04-15 | ジョウシュウシ エーエーシー レイテック オプトロニクス カンパニーリミテッド | Microscope Objectives |
| CN117270185A (en) * | 2023-11-17 | 2023-12-22 | 长春长光智欧科技有限公司 | Micro-optical system with large numerical aperture and wide spectrum |
| CN117270185B (en) * | 2023-11-17 | 2024-02-20 | 长春长光智欧科技有限公司 | Micro-optical system with large numerical aperture and wide spectrum |
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