CN111856736B - Objective lens of microscope - Google Patents
Objective lens of microscope Download PDFInfo
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- CN111856736B CN111856736B CN202010662232.9A CN202010662232A CN111856736B CN 111856736 B CN111856736 B CN 111856736B CN 202010662232 A CN202010662232 A CN 202010662232A CN 111856736 B CN111856736 B CN 111856736B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/02—Objectives
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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
- 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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- 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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Abstract
The invention discloses a microscope objective lens, which consists of seventeen lenses coaxially arranged in sequence from an object space to an image space, wherein a first cemented lens group which is a positive lens is formed by a first lens and a second lens; the third lens is a positive lens; the fourth lens, the fifth lens and the sixth lens form a second cemented lens group which is a positive lens; the seventh lens is a positive lens; the eighth lens, the ninth lens and the tenth lens form a third cemented lens group which is a positive lens; the eleventh lens and the twelfth lens form a fourth cemented lens group which is a negative lens; the thirteenth lens and the fourteenth lens form a fifth cemented lens group which is a negative lens; the fifteenth lens, the sixteenth lens and the seventeenth lens form a sixth cemented lens group which is a positive lens, wherein the focal length of the first cemented lens group is 14mm or more and f1 or more and 16mm or less, and the focal length f of the whole lens satisfies the following conditions: f is more than or equal to 3.35mm and less than or equal to 3.37mm, and the total optical length TTL meets the following requirements: TTL is more than or equal to 64mm and less than or equal to 65mm, and the advantages of high multiplying power, large numerical aperture, flat field and apochromatism are achieved.
Description
Technical Field
The present invention relates to a microscope, and more particularly, to an objective lens for a microscope.
Background
Microscopes are the most common tools for humans to explore the micro world, and microscope objectives are one of the most important optical devices that make up microscopes. At present, the microscope objective with large aperture and high resolution has important application in microscopes such as bioluminescence microscopes, confocal microscopes and the like. In the biomedical field, in particular, microscope objectives with larger field of view and higher image quality are required for more direct observation of microscopic organisms and their tissue structures. At present, the requirements of high imaging quality and large numerical aperture of the microscope objective in more fields cannot be met by various existing microscope objectives, so that the numerical aperture and the imaging quality of the microscope objective are further improved, and the microscope objective has very important significance in various fields.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel microscope objective lens which has the advantages of high multiplying power (60 times), large numerical aperture (NA1.4), flat field and apochromatic aberration and can meet the requirements of various research fields on the microscope objective lens with the large numerical aperture.
The technical scheme adopted by the invention for solving the technical problems is as follows: a microscope objective lens comprises seventeen lenses which are coaxially arranged in sequence from an object space to an image space, wherein a first cemented lens group which is a positive lens is formed by a first lens and a second lens, and the focal length of the first cemented lens group is more than or equal to 5mm and less than or equal to f and less than or equal to 6 mm; the third lens is a positive lens, and the focal length is more than or equal to 19mm and less than or equal to 21 mm; the fourth lens, the fifth lens and the sixth lens form a second cemented lens group which is a positive lens, and the focal length is more than or equal to 35mm and less than or equal to 37 mm; the seventh lens is a positive lens, and the focal length is more than or equal to 28mm and less than or equal to 31 mm; the eighth lens, the ninth lens and the tenth lens form a third cemented lens group which is a positive lens, and the focal length is more than or equal to 81mm and less than or equal to f and less than or equal to 94 mm; the eleventh lens and the twelfth lens form a fourth cemented lens group which is a negative lens, and the focal length is 33 mm-39 mm; the thirteenth lens and the fourteenth lens form a fifth cemented lens group which is a negative lens, and the focal length is more than or equal to 10mm and less than or equal to f and less than or equal to 12 mm; the fifteenth lens, the sixteenth lens and the seventeenth lens form a sixth cemented lens group which is a positive lens, and the focal length is 63 mm-f-106 mm; the focal length f of the whole lens meets the following conditions: f is more than or equal to 3.35mm and less than or equal to 3.37mm, and the total optical length TTL meets the following requirements: TTL is not less than 64mm and not more than 65 mm.
The first lens faces the object space and is a plane, the second lens faces the image space and is a concave spherical surface, the first lens faces the object space and is a convex spherical surface, the second lens faces the image space and is a convex spherical surface, and the convex spherical surface of the first lens facing the image space and the concave spherical surface of the second lens facing the object space are glued together.
The third lens faces the object space and is a concave spherical surface, and faces the image space and is a convex spherical surface.
The fourth lens is a convex spherical surface facing the object space, the fifth lens is a concave spherical surface facing the object space, the sixth lens is a convex spherical surface facing the image space, the fourth lens is a convex spherical surface facing the object space, the fourth lens is a convex spherical surface facing the image space, the fifth lens is a concave spherical surface facing the object space, and the fifth lens is a concave spherical surface facing the image space, the sixth lens is a convex spherical surface facing the object space.
The seventh lens is a convex spherical surface facing the object space and a convex spherical surface facing the image space.
The eighth lens is a convex spherical surface facing the object space and a concave spherical surface facing the image space, the ninth lens is a convex spherical surface facing the object space and a convex spherical surface facing the image space, the tenth lens is a concave spherical surface facing the object space and a convex spherical surface facing the image space, the concave spherical surface facing the image space of the eighth lens and the convex spherical surface facing the object space of the ninth lens are glued together, and the convex spherical surface facing the image space of the ninth lens and the concave spherical surface facing the object space of the tenth lens are glued together.
The eleventh lens is a convex spherical surface facing the object space, the image space is a convex spherical surface, the twelfth lens is a concave spherical surface facing the object space, the image space is a concave spherical surface, and the convex spherical surface of the eleventh lens facing the image space and the concave spherical surface of the twelfth lens facing the object space are glued together.
The thirteenth lens is a convex spherical surface facing the object space, the fourteenth lens is a concave spherical surface facing the image space, the convex spherical surface facing the image space is glued with the concave spherical surface facing the object space of the fourteenth lens.
The fifteenth lens is a concave spherical surface facing the object space and a convex spherical surface facing the image space, the sixteenth lens is a concave spherical surface facing the object space and a concave spherical surface facing the image space, the seventeenth lens is a convex spherical surface facing the object space and a convex spherical surface facing the image space, the convex spherical surface of the fifteenth lens facing the image space and the concave spherical surface of the sixteenth lens facing the object space are glued together, and the concave spherical surface of the sixteenth lens facing the image space and the convex spherical surface of the seventeenth lens facing the object space are glued together.
Compared with the prior art, the invention has the advantages that the microscope objective is formed by adopting the lens structure with specific parameters, and compared with the conventional microscope objective, the designed numerical aperture is larger, and can reach NA1.4) the energy on the surface of the collected object is stronger and more concentrated. The high-power high-aperture micro objective lens has the advantages of high magnification (60 times), large numerical aperture (NA1.4), flat field and apochromatism, and can meet the requirements of various research fields on the large-numerical aperture micro objective lens; the microscope objective of the invention adopts spherical lenses, can be realized completely under the existing processing and detecting process, has reasonable design and easy manufacture, and can meet the requirement of mass production.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of field curvature of an objective lens according to an embodiment of the present invention, in which the ordinate represents an angle of an incident light ray, which may correspond to the number of fields of view of the objective lens, and the abscissa represents the magnitude of the field curvature, and four curves are field curvature curves of F light (486.1nm), d light (587.5nm), C light (656.3nm), g light (436nm), respectively;
FIG. 3 is a schematic diagram of distortion of an objective lens according to an embodiment of the present invention, wherein the ordinate represents the angle of incident light, which may correspond to the number of fields of view of the objective lens, and the abscissa represents the magnitude of distortion, and the four curves are the field curves of F light (486.1nm), d light (587.5nm), C light (656.3nm), and g light (436nm), respectively;
FIG. 4 is a transverse aberration diagram of the field of view at 0 image side of the objective lens according to the embodiment of the present invention, (a) is the meridional direction, where the abscissa Py represents the entrance pupil and the ordinate ey represents the transverse aberration; (b) is the sagittal direction, the abscissa Px in the figure represents the entrance pupil, and the ordinate ex represents the lateral aberration;
FIG. 5 is a transverse aberration diagram of the objective lens at the image space of the 1.8 field of view according to the embodiment of the present invention, wherein (a) is the meridional direction, wherein the abscissa Py represents the entrance pupil and the ordinate ey represents the transverse aberration; (b) is the sagittal direction, the abscissa Px in the figure represents the entrance pupil, and the ordinate ex represents the lateral aberration;
FIG. 6 is a schematic diagram of the chromatic shift of an objective lens according to an embodiment of the present invention, wherein the ordinate represents the wavelength of light in um, the wavelength ranges from 0.436 μm to 0.656 μm, and the abscissa represents the range of the focal shift.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example (b):
as shown in fig. 1, a microscope objective lens comprises seventeen lenses coaxially arranged in sequence from an object side to an image side, a first lens L1 is a plane facing the object side and a convex spherical surface facing the image side, a second lens L2 is a concave spherical surface facing the object side and a convex spherical surface facing the image side, the convex spherical surface facing the image side of the first lens L1 and the concave spherical surface facing the object side of the second lens L2 are glued together, and the first lens L1 and the second lens L1 form a first cemented lens group GL1 which is a positive lens; the third lens L3 is a concave spherical surface facing the object space and a convex spherical surface facing the image space, and is a positive lens; the fourth lens L4 is a convex spherical surface facing the object space, the fifth lens L5 is a concave spherical surface facing the object space, the image space is a concave spherical surface, the sixth lens L6 is a convex spherical surface facing the object space, the image space is a convex spherical surface, the convex spherical surface of the fourth lens L4 facing the image space and the concave spherical surface of the fifth lens L5 facing the object space are glued together, the concave spherical surface of the fifth lens L5 facing the image space and the convex spherical surface of the sixth lens L6 facing the object space are glued together, and the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a second cemented lens group GL2 which is a positive lens; the seventh lens L7 is a convex spherical surface facing the object space and a convex spherical surface facing the image space, and is a positive lens; the eighth lens L8 is a convex spherical surface facing the object space, the image space is a concave spherical surface, the ninth lens L9 is a convex spherical surface facing the object space, the image space is a convex spherical surface, the tenth lens L10 is a concave spherical surface facing the object space, the image space is a convex spherical surface, the concave spherical surface of the eighth lens L8 facing the image space and the convex spherical surface of the ninth lens L9 facing the object space are glued together, the convex spherical surface of the ninth lens L9 facing the image space and the concave spherical surface of the tenth lens L10 facing the object space are glued together, and the eighth lens L8, the ninth lens L9 and the tenth lens L10 form a third cemented lens group GL3 which is a positive lens; the eleventh lens L11 is a convex spherical surface facing the object space, the image space, the twelfth lens L12 is a concave spherical surface facing the object space, the image space is a concave spherical surface, the convex spherical surface of the eleventh lens L11 facing the image space and the concave spherical surface of the twelfth lens L12 facing the object space are glued together, and the eleventh lens L11 and the twelfth lens L12 form a fourth cemented lens group GL4 which is a negative lens; the thirteenth lens L13 is a convex spherical surface facing the object space, the image space, the fourteenth lens L14 is a concave spherical surface facing the object space, the image space is a concave spherical surface, the convex spherical surface of the thirteenth lens L13 facing the image space and the concave spherical surface of the fourteenth lens L14 facing the object space are glued together, and the thirteenth lens L13 and the fourteenth lens L14 form a fifth cemented lens group GL5 which is a negative lens; the fifteenth lens L15 is a concave spherical surface facing the object side, and is a convex spherical surface facing the image side, the sixteenth lens L16 is a concave spherical surface facing the object side, and is a concave spherical surface facing the image side, the seventeenth lens L17 is a convex spherical surface facing the object side, and is a convex spherical surface facing the image side, the fifteenth lens L15 is a convex spherical surface facing the image side and is glued together with the sixteenth lens L16, and the sixteenth lens L16 is a concave spherical surface facing the image side and is glued together with the seventeenth lens L17, and the fifteenth lens L15, the sixteenth lens L16 and the seventeenth lens L17 form a sixth cemented lens group GL6 which is a positive lens.
Example (c): the following is one example, but not all, of embodiments of the invention. The 17 lenses of the invention had 25 outer surfaces in total.
In this example, the focal length of the first cemented lens group GL1 composed of the first lens L1 and the second lens L1 is 5.64 mm; the focal length of the third lens L3 is 20.07 mm; the focal length of the second cemented lens group GL2 consisting of the fourth lens L4, the fifth lens L5 and the sixth lens L6 is 35.44 mm; the focal length of the seventh lens L7 is 30.08 mm; the focal length of the third cemented lens group GL3 consisting of the eighth lens L8, the ninth lens L9 and the tenth lens L10 is 84.46 mm; the focal length of the fourth cemented lens group GL4 consisting of the eleventh lens L11 and the twelfth lens L12 is-36.46 mm; the focal length of the fifth cemented lens group GL5 consisting of the thirteenth lens L13 and the fourteenth lens L14 is-11.58 mm; the focal length of the sixth cemented lens group GL6 composed of the fifteenth lens L15, the sixteenth lens L16 and the seventeenth lens L17 is 89.03mm, the focal length f of the entire lens is 3.359mm, and the total optical length TTL is 64.254 mm. As can be seen from fig. 2 and 3, the curvature of field and distortion in this example are well corrected; as can be seen from fig. 4 and 5, the aberration balance is good and the imaging is excellent; while it can be seen from fig. 6 that the chromatic aberration along the axis of the lens is well corrected.
Claims (9)
1. A microscope objective lens is characterized in that the microscope objective lens consists of seventeen lenses which are coaxially arranged in sequence from an object space to an image space, a first cemented lens group which is a positive lens and has a focal length of 5 mm-f-6 mm; the third lens is a positive lens, and the focal length is more than or equal to 19mm and less than or equal to 21 mm; the fourth lens, the fifth lens and the sixth lens form a second cemented lens group which is a positive lens, and the focal length is more than or equal to 35mm and less than or equal to 37 mm; the seventh lens is a positive lens, and the focal length is more than or equal to 28mm and less than or equal to 31 mm; the eighth lens, the ninth lens and the tenth lens form a third cemented lens group which is a positive lens, and the focal length is more than or equal to 81mm and less than or equal to f and less than or equal to 94 mm; the eleventh lens and the twelfth lens form a fourth cemented lens group which is a negative lens, and the focal length is 33 mm-39 mm; the thirteenth lens and the fourteenth lens form a fifth cemented lens group which is a negative lens, and the focal length is more than or equal to 10mm and less than or equal to f and less than or equal to 12 mm; the fifteenth lens, the sixteenth lens and the seventeenth lens form a sixth cemented lens group which is a positive lens, and the focal length is 63 mm-f-106 mm; the focal length f of the whole lens meets the following conditions: f is more than or equal to 3.35mm and less than or equal to 3.37mm, and the total optical length TTL meets the following requirements: TTL is not less than 64mm and not more than 65 mm.
2. A microscope objective as claimed in claim 1, wherein the first lens element is planar facing the object and convex and the second lens element is concave and convex facing the image, the convex surface of the first lens element facing the image and the concave surface of the second lens element facing the object being cemented together.
3. A microscope objective according to claim 1, wherein the third lens element is concave spherical facing the object and convex spherical facing the image.
4. A microscope objective lens according to claim 1, wherein the fourth lens element is convex spherical surface facing the object side and convex spherical surface facing the image side, the fifth lens element is concave spherical surface facing the object side and concave spherical surface facing the image side, the sixth lens element is convex spherical surface facing the object side and convex spherical surface facing the image side, the convex spherical surface of the fourth lens element facing the image side and the concave spherical surface of the fifth lens element facing the object side are cemented together, and the concave spherical surface of the fifth lens element facing the image side and the convex spherical surface of the sixth lens element facing the object side are cemented together.
5. A microscope objective as claimed in claim 1, wherein the seventh lens element is convex spherical facing the object and convex spherical facing the image.
6. A microscope objective lens according to claim 1, wherein the eighth lens element is convex spherical surface facing the object side and concave spherical surface facing the image side, the ninth lens element is convex spherical surface facing the object side and convex spherical surface facing the image side, the tenth lens element is concave spherical surface facing the object side and convex spherical surface facing the image side, the concave spherical surface of the eighth lens element facing the image side and the convex spherical surface of the ninth lens element facing the object side are cemented together, and the convex spherical surface of the ninth lens element facing the image side and the concave spherical surface of the tenth lens element facing the object side are cemented together.
7. A microscope objective as claimed in claim 1, wherein the eleventh lens element is convex spherical facing the object and convex spherical facing the image, the twelfth lens element is concave spherical facing the object and concave spherical facing the image, and the convex spherical facing the image of the eleventh lens element is cemented with the concave spherical facing the object of the twelfth lens element.
8. A microscope objective as claimed in claim 1, wherein the thirteenth lens element is convex spherical surface facing the object side and convex spherical surface facing the image side, the fourteenth lens element is concave spherical surface facing the object side and concave spherical surface facing the image side, and the convex spherical surface facing the image side of the thirteenth lens element and the concave spherical surface facing the object side of the fourteenth lens element are cemented together.
9. A microscope objective lens according to claim 1, wherein the fifteenth lens element is concave and convex in the object-facing direction, the sixteenth lens element is concave and convex in the image-facing direction, the seventeenth lens element is convex and convex in the object-facing direction and convex in the image-facing direction, the convex surface of the fifteenth lens element facing the image-facing direction being cemented to the concave surface of the sixteenth lens element facing the object-facing direction, and the concave surface of the sixteenth lens element facing the image-facing direction being cemented to the convex surface of the seventeenth lens element facing the object-facing direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010662232.9A CN111856736B (en) | 2020-07-10 | 2020-07-10 | Objective lens of microscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010662232.9A CN111856736B (en) | 2020-07-10 | 2020-07-10 | Objective lens of microscope |
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| Publication Number | Publication Date |
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| CN111856736A CN111856736A (en) | 2020-10-30 |
| CN111856736B true CN111856736B (en) | 2022-06-03 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295566C (en) * | 2002-05-03 | 2007-01-17 | 卡尔蔡司Smt股份公司 | Very high-aperture projection objective |
| CN104280869B (en) * | 2014-10-29 | 2016-08-17 | 南京恒磊光学技术研究有限公司 | A kind of microscope objective |
| CN105137583B (en) * | 2015-07-08 | 2017-11-14 | 宁波舜宇仪器有限公司 | Micro objective |
| CN107884911B (en) * | 2017-11-29 | 2020-05-19 | 福建福光股份有限公司 | Large-aperture large-target-surface low-light-level imaging lens |
| CN108873288B (en) * | 2018-06-13 | 2021-05-14 | 中国科学院苏州生物医学工程技术研究所 | Microscope objective and microscope comprising same |
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